Abstract

This electric motor control device comprises a signal identification unit and an overvoltage detection unit. The signal identification unit includes an optical isolator for converting electric signals supplied through a terminal to which an external device is connected, and furthermore includes a switch for opening a connection circuit connected to the terminal. The overvoltage detection unit is formed so as to open the switch when the voltage applied to the connection circuit exceeds a threshold voltage.

IPC Classes  ?

• H02P 29/024 - Detecting a fault condition, e.g. short circuit, locked rotor, open circuit or loss of load

Abstract

Provided is an insulation tape comprising a base layer, two adhesive layers, and two reinforcement layers. The base layer includes a first surface and a second surface on the opposite side of the first surface. The two adhesive layers contain nano-sized silica particles and are overlaid on the first surface and the second surface, respectively. The two reinforcement layers are provided for the first surface and the second surface, respectively, and are adhered to the base layer by the adhesive layers.

IPC Classes  ?

• H02K 3/30 - Windings characterised by the insulating material

Abstract

In the present invention, first and second communication lines (L1, L2) connect, with daisy chains, a plurality of control circuits respectively corresponding to a plurality of UPS modules (U1-U5). The transmission direction of data in the second communication line (L2) is reverse of the transmission direction of data in the first communication line (L1). First communication terminals (Tin1, Tout1) of each of the UPS modules receive, via the first communication line (L1), detection values of AC output currents of the other USP modules and transmit a detection value of an own AC output current to respective other control circuits. Second communication terminals (Tin2, Tout2) of each of the UPS modules receive, via the second communication line (L2), detection values of AC output currents of the other USP modules and transmit a detection value of an own AC output current to the respective other control circuits. The control circuits each generate a current command value on the basis of the detection values of the own AC output currents and the detection values of the AC output currents of the other UPS modules received by the first and/or second communication terminals.

IPC Classes  ?

• H02J 9/06 - Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over

Abstract

Provided is an electric power conversion apparatus comprising: a main circuit unit that converts electric power of a distributed power supply into AC power corresponding to an electric power system; and a control unit that controls an operation of the main circuit unit. The control unit has: an estimated value computation unit that computes an estimated value of a resistance component of system impedance of the electric power system, an estimated value of a reactance component of the system impedance, and an estimated value of a voltage value of an infinite busbar power system, on the basis of an active power value at a connection point to the electric power system, a reactive power value at the connection point, and a voltage value at the connection point; and a reactive power computation unit that computes a reactive power command value of reactive power that is supplied to the electric power system, on the basis of the respective estimated values. The estimated value computation unit has a first estimation unit that computes the respective estimated values using a Kalman filter corresponding to a nonlinear system, and a second estimation unit that computes the respective estimated values using Newton's method. Thus, an electric power conversion apparatus, a control device, and a distributed power supply system that can more appropriately reduce voltage fluctuations at a connection point of a distributed power supply are provided.

IPC Classes  ?

• H02M 7/48 - Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
• H02J 3/18 - Arrangements for adjusting, eliminating or compensating reactive power in networks
• H02J 3/38 - Arrangements for parallelly feeding a single network by two or more generators, converters or transformers

Abstract

Provided is a photovoltaic power generating system comprising: a plurality of solar cell panels; a plurality of power conversion devices which convert DC power supplied from the plurality of solar cell panels into AC power and supply the AC power to electric power systems; and a control device for controlling the operation of the plurality of power conversion devices. The control device has a total output value calculation unit for calculating a total effective power value representing the magnitude of effective power that can be outputted currently from all of the plurality of power conversion devices; a difference calculation unit for calculating a difference between a total upper limit command value and the total effective power value and dividing the difference by the number of the plurality of power conversion devices, thereby calculating a difference for each of the plurality of power conversion devices; and an upper limit command value calculation unit for adding the difference per power conversion device to an effective power value, thereby calculating an individual upper limit command value for each of the plurality of power conversion devices. Accordingly, it is possible to provide a photovoltaic power generating system and a control device which can inhibit excessive lowering of the total value of effective power to be supplied to electric power systems from a plurality of power conversion devices.

IPC Classes  ?

• H02J 3/38 - Arrangements for parallelly feeding a single network by two or more generators, converters or transformers

Abstract

Provided is a switching device for charging equipment, the switching device comprising: a switching unit that switches connections between each of a plurality of power sources and each of a plurality of charging stations; and a control unit that controls the switching of connections by the switching unit. The switching unit has a plurality of first switching elements provided to correspond to the plurality of power sources, respectively, and a plurality of second switching elements that are provided between each of the plurality of first switching elements and each of the plurality of charging stations, and allow direct-current power, which is supplied from the plurality of power sources through the plurality of first switching elements, to be selectively supplied to each of the plurality of charging stations. The control unit controls switching of each of the plurality of first switching elements and the plurality of second switching elements, thereby controlling the switching of connections by the switching unit. Thus, provided is the switching device for charging equipment that can appropriately switch output locations while curbing increases in the cost of equipment.

IPC Classes  ?

• H02J 7/00 - Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
• H02J 7/02 - Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries for charging batteries from ac mains by converters

Abstract

Provided is a power supply system for an autonomous system comprising: a plurality of power supply devices; a plurality of voltage-source voltage control power conversion devices that are connected in parallel with an autonomous system, converts the power supplied from the plurality of power supply devices to an AC power corresponding to the autonomous system, and supplies the converted AC power to the autonomous system; and a control device that controls the power conversion operations of the plurality of power conversion devices. The control device calculates the plurality of active power command values of the plurality of power conversion devices according to active powers required in the autonomous system and calculates the plurality of reactive power command values of the plurality of power conversion devices according to reactive powers required in the autonomous system. The plurality of power conversion devices perform voltage control operations so as to output the active powers according to the active power command values and output the reactive powers according to the reactive power command values. This provides the power supply system for the autonomous system capable of stably supplying power to the autonomous system even when the plurality of voltage-source voltage control power conversion devices are operated in parallel.

IPC Classes  ?

• H02M 7/48 - Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
• H02M 7/493 - Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode the static converters being arranged for operation in parallel

Abstract

First to third capacitors (UC1-UC3) each have an identical rectangular parallelepiped shape. First surfaces (P1) of each of the rectangular parallelepiped capacitors each have first and second sides perpendicular to each other, second surfaces (P2) each have the second and third sides perpendicular to each other, and third surfaces (P3) each have the first and third sides perpendicular to each other. The length of the first sides is two times or greater than and less than three times the length of the third sides. The first and second capacitors (UC1, UC2) are disposed so that the first surfaces (P1) are perpendicular to an installation surface (10), the first surfaces (P1) face each other with a gap therebetween, and the second surfaces (P2) are horizontal to the installation surface (10). The third capacitor (UC3) is disposed so that the first surfaces (P1) face the second surfaces (P2) of the first and second capacitors (UC1, UC2) with a gap therebetween, and the third surfaces (P3) are flush with the third surfaces (P3) of the first and second capacitors (UC1, UC2).

IPC Classes  ?

• H02M 7/48 - Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode

Abstract

A tandem rolling system according to the present invention makes it possible to reduce fluctuations in the plate thickness on the outlet side of the final stand. The tandem rolling system comprises a final target mass flow computation unit and an upstream mass flow control unit. The final target mass flow computation unit multiplies the actual value of the speed of a material to be rolled, measured on the outlet side of an Nth stand (N ≥ 3) that is the final stand, by a final-stand-outlet-side plate thickness target value defined in advance according to product specifications of the material to be rolled, and calculates a final target mass flow, which is the outlet-side mass flow of the final stand. The upstream mass flow control unit controls an actuator provided to an ith stand (1 ≤ i ≤ N - 2) or an actuator provided upstream relative to the ith stand, such that the outlet-side mass flow for the ith stand matches the final target mass flow.

IPC Classes  ?

• B21B 37/00 - Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
• B21B 37/18 - Automatic gauge control
• B21B 37/20 - Automatic gauge control in tandem mills
• B21B 37/46 - Roll speed or drive motor control

Abstract

This uninterruptible power supply system comprises: a selection unit (27) that selects, from among a plurality of uninterruptible power supply devices (U), the number of uninterruptible power supply devices required in order to supply power to a load (73). Each uninterruptible power supply device executes a driving operation in which power is supplied to the load in a case where a host device is selected, executes a standby operation in which power is not supplied in a case where the host device is not selected, and executes a diagnostic operation to diagnose whether a predetermined part (5, 8, 9) in the host device has failed during the standby operation. The selection unit changes the uninterruptible power supply devices to be selected so as to equalize the operating times of the plurality of uninterruptible power supply devices.

IPC Classes  ?

• H02J 9/06 - Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over

Abstract

According to the present invention, at least one first electric power converter among a plurality of electric power converters (81 to 85) has a charging mode in which alternating current electric power supplied from an alternating current power source (71) via a switch (2) is converted into direct current electric power and stored in a corresponding electrical storage device (73), and a standby mode in which a control signal for electric power conversion is generated and standby for electric power conversion is performed. In a case in which alternating current voltage from the alternating current power source (71) is normal, a control device (10) turns the switch (2) on, and alternately switches at least one first electric power converter between the charging mode and the standby mode. In a case in which the alternating current voltage is not normal, the control device (10) turns the switch (2) off, and also controls each of the plurality of electric power converters (81-85) so as to convert direct current electric power of the electrical storage device (73) into alternating current electric power and to perform supply thereof to a load (72).

IPC Classes  ?

• H02J 9/06 - Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over

Abstract

A SCADA web HMI client device according to the present invention comprises a processor and memory. The memory stores screen operation authority information, exception information, and image data of an HMI screen for monitoring an industrial plant, which have been received from a web server. The screen operation authority information stipulates, for each web browser, whether operation of the HMI screen is permitted. The exception information stipulates, for each web browser, whether operation of specific operation parts on the HMI screen is permitted. The processor executes a screen rendering process for rendering the HMI screen on the web browsers, wherein the operation permissions and denials thereof stipulated in the exception information are preferentially applied to said specific operation parts on the HMI screen, and the operation permissions and denials thereof stipulated in the screen operation authority information are applied to operation parts other than said specific operation parts on the HMI screen.

IPC Classes  ?

• G05B 23/02 - Electric testing or monitoring

Abstract

An uninterruptible power supply system (100) comprises a plurality of UPSs, a plurality of switches for connecting the plurality of UPSs in parallel with loads, and a connection circuit (40). The UPSs each include: a power converter (3) for generating an AC voltage having a predetermine frequency; and an output terminal (T3) for outputting the AC voltage generated by the power converter. The plurality of switches include a first switch (21b) connected between the output terminal of a first UPS (11) and the loads, a second switch (22b) connected between the output terminal of a second UPS (12) and the loads, and a third switch (23b) connected between the output terminal of a third UPS (13) and the loads. The connection circuit (40) is configured so that a reactor (41) is connected between the output terminal of the first UPS and the output terminal of the second UPS in a state in which the first and second switches are turned off and the third switch is turned on.

IPC Classes  ?

• H02J 9/06 - Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over
• H02J 3/32 - Arrangements for balancing the load in a network by storage of energy using batteries with converting means
• H02M 7/48 - Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode

Abstract

The present disclosure relates to a tail end squeezing prevention device for a tandem rolling mill wherein a material to be rolled undergoes rolling in N (N≥2) consecutive rolling stands. Each ith rolling stand (1≤i≤N) in the tandem rolling mill has an ith roll bender device for reducing the material to be rolled with a preset roll bender pressure. During the interval between the release of the tail end of the material being rolled from one specified jth rolling stand (1≤j≤N-1) and release from the Nth rolling stand, the tail end squeezing prevention device continuously reduces the roll bender pressure in the j+1th to the Nth roll bender devices downstream from the jth rolling stand.

IPC Classes  ?

• B21B 33/02 - Preventing fracture of rolls
• B21B 37/38 - Control of flatness or profile during rolling of strip, sheets or plates using roll bending
• B21B 37/68 - Camber or steering control for strip, sheets or plates, e.g. preventing meandering
• B21B 37/72 - Rear end control; Front end control

Abstract

A drive system according to an embodiment of the present invention comprises an initial phase command generation unit, a rotor phase detection unit, and a drive control unit. The initial phase command generation unit generates a phase command value corresponding to the initial phase of a rotor prior to start-up of a synchronous motor. The rotor phase detection unit detects and outputs the phase of the rotor. The drive control unit use the phase command value to control driving of the synchronous motor. The initial phase command generation unit uses the detection result of the phase of the rotor, as detected by the rotor phase detection unit prior to the start-up, to adjust the phase command value to approximate the phase of the rotor in the detection result.

IPC Classes  ?

• H02P 6/20 - Arrangements for starting

Abstract

A drive system according to an aspect of an embodiment of the present invention is provided with a rotor phase detection unit, a phase estimation unit, a phase-error-adjusting unit, and a drive control unit. The rotor phase detection unit detects the phase of the rotor of a synchronous motor and outputs phase information indicating the detected phase. The phase estimation unit generates an initial phase command prescribing a position of the rotor of the synchronous motor, using a correction amount for correcting a phase error. The phase-error-adjusting unit generates the correction amount for adjusting a phase error of an initial magnetic pole position of the synchronous motor, using the phase error of the initial phase command at a timing prescribed by the phase information. The drive control unit controls driving of the synchronous motor, using the initial phase command having the phase error adjusted.

IPC Classes  ?

• H02P 6/20 - Arrangements for starting

Abstract

The purpose of the present disclosure is to provide an active gas generation apparatus that can uniformly jet out active gas with a constant radical concentration. Further, in the active gas generation apparatus of the present disclosure, a unidirectional electric discharge structure (61s) satisfies the following disposition requirements (a) to (c). Requirement (a) is a requirement that a region in which a corresponding metal electrode (10p) and a corresponding metal electrode (20p) overlap each other in a corresponding gap region (23p), as seen in a plan view, serves as a corresponding electric discharge space (6p). Requirement (b) is a requirement that a plurality of gas supply holes (12) provided in a corresponding gas supply region (12Rp) and the corresponding gap region (23p) overlap each other, as seen in a plan view. Requirement (c) is a requirement that the plurality of gas supply holes (12) provided in the corresponding gas supply region (12Rp) and a plurality of gas jetting holes (22) provided under the corresponding gap region (23p) are, as seen in a plan view, disposed opposite to each other on a one-to-one basis along the Y direction, with the corresponding electric discharge space (6p) sandwiched therebetween.

IPC Classes  ?

• H05H 1/24 - Generating plasma
• C23C 16/509 - Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition (CVD) processes characterised by the method of coating using electric discharges using radio frequency discharges using internal electrodes

Abstract

The purpose of the present disclosure is to provide an active gas generation apparatus that has achieved an increase in the volume of an electric discharge space without increasing the required applied voltage. Further, in the active gas generation apparatus (51) of the present disclosure, a high-voltage application electrode part (1) has a laminate structure formed of an electrode dielectric film (11) and a metal electrode (10), and a ground potential electrode part (2) has a laminate structure formed of an electric discharge field adjustment film (30) and a metal electrode (20). A space between the electrode dielectric film (11) of the high-voltage application electrode part (1) and the electric discharge field adjustment film (30) of the ground potential electrode part (2) is defined as an electrode opposing space. In the electrode opposing space, regions in which the metal electrode (10) and the metal electrode (20) overlap each other, as seen in a plan view, serve as electric discharge spaces (4). The electric discharge field adjustment film (30) has a plurality of protrusions (30t) protruding upwardly so that the gap length in the electric discharge spaces (4) is short.

IPC Classes  ?

• H05H 1/24 - Generating plasma
• B01J 19/08 - Processes employing the direct application of electric or wave energy, or particle radiation; Apparatus therefor

Abstract

This uninterruptible power supply device (100) comprises a housing (110) that has a rectangular shape, a plurality of power converting units (20), and a bus-bar unit (130) for connecting the plurality of power converting units (20) to each other in a parallel manner. The plurality of power converting units (20) are stacked in the vertical direction and contained inside the housing (110). The bus-bar unit (130) is disposed facing the rear surface of the housing (110) inside the housing (110). The bus-bar unit (130) includes a plurality of bus-bars that extend vertically, at least one support member that supports the plurality of bus-bars so as to be separated from each other in the horizontal direction, and at least one fixing member that removably fixes each support member to the housing (110).

IPC Classes  ?

• H02J 9/06 - Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over
• G01F 1/30 - Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects by detection of dynamic effects of the flow by drag-force, e.g. vane type or impact flowmeter for fluent solid material

Abstract

The purpose of the present disclosure is to provide an ultrasonic bonding apparatus with which it is possible to precisely bond a lead wire onto a substrate. In this ultrasonic bonding apparatus (100), an ultrasonic bonding apparatus control panel (20) controls the actions of a lead placement unit (4) and a tension adjustment unit (5) having a dancer roller (53), and executes a bonding tension control process. The bonding tension control process includes a step for executing re-winding driving to re-wind a lead wire (81) within a lead cassette (40) when the dancer roller (53) arrives at a lower-limit adjustment position (H12) within a tension adjustment range (B5), and a step for executing feed-out driving to feed out the lead wire (81) from the lead cassette (40) when the dancer roller (53) arrives at an upper-limit adjustment position (H11) within the tension adjustment range (B5).

IPC Classes  ?

• B23K 20/10 - Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating making use of vibrations, e.g. ultrasonic welding

Abstract

This reactive power control device comprises: a voltage acquiring unit for detecting system voltage and DC voltage; a modulation factor calculation unit for calculating a modulation factor using the system voltage and the DC voltage acquired by the voltage acquiring unit; a reactive power command acquiring unit for acquiring a first reactive power command from a higher-level device; a dead band region determination unit for determining whether the first reactive power command acquired by the reactive power command acquiring unit is a dead band level or not; a reactive power command calculation unit which, when it is determined by the dead band region determination unit that the first reactive power command is not the dead band level, calculates a second reactive power command on the basis of the modulation factor calculated by the modulation factor calculation unit by limiting or compensating the first reactive power command; and a reactive power command output unit which, when the second reactive power command is calculated by the reactive power command calculation unit, outputs the second reactive power command and, when the second reactive power command is not calculated by the reactive power command calculation unit, outputs the first reactive power command.

IPC Classes  ?

• H02M 7/48 - Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode

Abstract

This uninterruptible power source device is provided inside of a housing and comprises: a converter (6) which converts first AC power from a commercial AC power source (21) to DC power; an inverter (10) which converts the DC power generated by the converter (6) or DC power supplied from a power storage device (23) into second AC power, and supplies the AC power to a load (24); a cooling fan (51) for lowering the temperature inside of the housing by continuously rotating at a rated rotation speed; and a control device (19) which diagnoses deterioration in the cooling fan (51) on the basis of a fan electric current flowing to the cooling fan (51) during an initial operation of the uninterruptible power source device and electrical current flowing to the cooling fan (51) during diagnosis.

IPC Classes  ?

• H02J 9/06 - Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over

Abstract

The purpose of the present disclosure is to provide a mist flow rate measurement device with which it is possible to precisely derive the flow rate of raw-material mist. In this mist flow rate measurement device, a camera (5) executes an imaging process for reflected light (L2) using at least part of a mist flow-through region, through which a mist-containing gas (G3) flows within transparent piping (10), as an imaging subject region, and acquires imaging information (S5). A mist flow rate computation unit (16) executes a mist flow rate computation process on the basis of the imaging information (S5). The mist flow rate computation process includes: a total value computation process for deriving a total brightness value, which is the total of a plurality of brightness values indicated by the imaging information (S5); and a flow rate calculation process for deriving the flow rate of a raw-material mist (3) from the total brightness value.

IPC Classes  ?

• G01F 1/74 - Devices for measuring flow of a fluid or flow of a fluent solid material in suspension in another fluid
• G01F 1/00 - Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow

Abstract

The purpose of the present disclosure is to provide a mist flow rate measurement device capable of finding the flow rate of a raw material mist with high accuracy. In the mist flow rate measurement device of the present disclosure, an upstream tubing (7), a large-diameter transparent tubing (31), and a downstream tubing (8) are combined to constitute an external discharge tubing. Part of a mist circulation region of the large-diameter transparent tubing (31) constitutes a region to be imaged by a mist-imaging camera. An inner diameter (D31) of the large-diameter transparent tubing (31) is set to a value greater than an inner diameter (D7) of the upstream tubing (7) and an inner diameter (D8) of the downstream tubing (8). Namely, the large-diameter transparent tubing (31), the upstream tubing (7), and the downstream tubing (8) have an inner-diameter size relationship of {D31>D7=D8}.

IPC Classes  ?

• G01F 1/74 - Devices for measuring flow of a fluid or flow of a fluent solid material in suspension in another fluid
• G01F 1/00 - Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow

Abstract

This power conversion device is provided with a converter main circuit, and a control unit. The converter main circuit includes a controllable semiconductor switch, and converts alternating-current power to direct-current power through switching of the semiconductor switch. The control unit causes the semiconductor switch to switch in a cycle of a first frequency in the case of a first situation where current flowing through the converter main circuit is lower than a threshold value established within an allowable operating range of the semiconductor switch, and causes the semiconductor switch to switch in a cycle of a second frequency higher than the first frequency in the case where a second situation arises in which the current flowing through the converter main circuit is greater than the threshold value.

IPC Classes  ?

• H02M 7/12 - Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode

Abstract

An uninterruptible power supply device comprising a housing (120) that accommodates components of the uninterruptible power supply device, a cooling fan (71) that cools the inside of the housing (120), a part of electrical components which are arranged in a first block (41) inside the housing (120) and form the uninterruptible power supply device (1), another part of electrical components which are arranged in a second block (42) inside the housing (120) and form the uninterruptible power supply device (1), and a partition structure (30) disposed adjacent to an exhaust side of the second block (42) and configured to be able to adjust the flow of air circulating in the first block (41) and the second block (42). The part of electrical components comprise an electrical component through which an alternating current flows. The other part of electrical components comprise an electrical component through which a direct current flows.

IPC Classes  ?

• H02J 9/06 - Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over

Abstract

A first current detector (CT1) detects the output current of a module type uninterruptible power supply device. A plurality of first control circuits (6) are provided corresponding to each of a plurality of power conversion modules. The power conversion modules each include resistance elements (11) and second switches (S5). The second switches (S5) connect the first current detector (CT1) and the resistance elements (11) in parallel with each other in an on-state. The first control circuits (6) are each configured so as to turn on the second switches (S5) when bringing the corresponding power conversion module into an operation state and, meanwhile, to turn off the second switches (S5) when bringing the power conversion module into a stop state. The first control circuits each detect the shared current of the corresponding power conversion module on the basis of the currents flowing through the resistance elements when the second switches (S5) are in the on-state. The first control circuits each control a power converter so that the output current of the power conversion module becomes the shared current.

IPC Classes  ?

• H02J 9/06 - Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over

Abstract

A main controller (22) comprises a first programmable device (40), a device (42), and a first selector (44). Each controller (66) comprises a second programmable device (50) and a second selector (52). The second programmable device (50) comprises a memory (502) and a processor (500). The first selector (44) connects the first programmable device (40) to a serial communication line (15) at the time of operating an uninterruptible power supply device, and connects the device (42) to the serial communication line in response to the reception of an execution instruction for update processing by the device (42). The second selector (52) connects the processor (500) to the serial communication line (15) at the time of operating the uninterruptible power supply device, and connects the memory (502) to the serial communication line (15) in response to the reception of the execution instruction from the first programmable device (40) by the processor (500) during the operation of the uninterruptible power supply device.

IPC Classes  ?

• H02J 9/06 - Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over

Abstract

A converter control unit (8) of this thyristor starting device includes: a current control unit (14) for generating a voltage command value of the output voltage of a converter (1) by performing a control calculation using the integral element of a DC current deviation with respect to a current command value; a correction unit (15) for adding a correction value to the voltage command value; and a control angle calculation unit (16) for calculating a phase control angle of a thyristor of the converter (1) on the basis of the voltage command value to which the correction value is added. In an intermittent commutation mode, the correction value is set so as to become larger as the rotational speed of a synchronous machine increases.

IPC Classes  ?

• H02P 27/06 - Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters

Abstract

This power conversion device submodule comprises: IGBTs (11a to 14a, 11b to 14b); drive circuits (40a, 42a, 40b, 42b) for driving the IGBTs (11a to 14a, 11b to 14b); laminated bus bars (22a, 22b) mounted with the IGBTs (11a to 14a, 11b to 14b); substrates (23a, 24a, 23b, 24b) mounted with the drive circuits (40a, 42a, 40b, 42b); a housing frame (55) for housing the IGBTs (11a to 14a, 11b to 14b), the drive circuits (40a, 42a, 40b, 42b), the laminated bus bars (22a, 22b), and the substrates (23a, 24a, 23b, 24b); and separation frames (52a, 52b) for separating a space in which the drive circuits (40a, 42a, 40b, 42b) and the substrates (23a, 24a, 23b, 24b) are disposed from a space in which the IGBTs (11a to 14a, 11b to 14b) and the laminated bus bars (22a, 22b) are disposed.

IPC Classes  ?

• H02M 7/48 - Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode

Abstract

This arc furnace equipment comprises an arc furnace, a camera, and an information-processing device. The arc furnace causes scrap to melt using heat generated by an arc discharge between the scrap and an electrode. The camera captures an image of the scrap placed in the arc furnace. The information-processing device: inputs, into an arc interruption prediction model, the disposition and sparseness/denseness information regarding the scrap based on image data acquired from the camera, and control record data relating to the electrode after melting has commenced; and predicts the occurrence of an arc interruption caused by a short-circuit between the scrap and the electrode due to collapse of the scrap during melting.

IPC Classes  ?

• F27B 3/28 - Arrangement of controlling, monitoring, alarm or like devices
• H05B 7/152 - Automatic control of power by electromechanical means for positioning of electrodes

Abstract

A drive system according to one mode of an embodiment of the present invention is provided with: a first phase estimation unit; a second phase estimation unit; a state determination unit; and a drive control unit. The first phase estimation unit generates a first phase obtained by estimating a phase of a rotor by using an initial phase in a startup stage of a synchronous motor as a reference. The second phase estimation unit generates a second phase obtained by estimating a phase of the rotor being rotating, on the basis of an operation state of the synchronous motor. The state determination unit determines the operation state of the synchronous motor. The drive control unit controls the drive of the synchronous motor using either one of the first phase and the second phase on the basis of a determination result of the operation state of the synchronous motor. The first phase estimation unit corrects the first phase by using a detection result for the rotor position detected in a period from the start of a startup process for the synchronous motor to the success of the startup.

IPC Classes  ?

• H02P 6/16 - Circuit arrangements for detecting position

Abstract

Provided is a wind pressure shutter having a high waterproof property and a high dust resistance during storm, a low cost, and a low failure risk. The wind pressure shutter comprises a first rotation shaft, a first door, a second rotation shaft, and a second door. The first door is rotatably suspended from the first rotation shaft, closes a flow path at a vertical position, and opens the flow path at a position rotated from the vertical position. The second door is rotatably attached to the second rotation shaft, closes the flow path and allows the upstream side end portion thereof to prevent the first door from rotating at a horizontal position, and opens the flow path at a position rotated from the horizontal position. When a negative pressure occurs in the downstream from the second door, the second door rotates to open the flow path, the upstream side end portion departs from the first door, and then the first door rotates to the downstream side to open the flow path.

IPC Classes  ?

• H02B 1/56 - Cooling; Ventilation

Abstract

According to the present invention, a switch device (52) includes a switch (SW) configured to cause an output terminal of a main circuit (30) to be short-circuited by turning on the switch. Upon receiving an on-command for the switch (SW) from the control device (120), a control circuit (33) is configured to turn the switch (SW) on and transmit the on/off state of the switch (SW) to the control device (120). Upon detecting an abnormality between a cell (10) of a plurality of cells (10) and a control circuit (32), the control device (120) transmits an on-command for the switch (SW) to the control circuit (33) in the cell (10) in which the abnormality has been detected.

IPC Classes  ?

• H02M 7/49 - Combination of the output voltage waveforms of a plurality of converters

Abstract

A cooler according to an embodiment of this invention comprises a contact surface, a flow path formation unit, a supply unit, a discharge unit, and at least one retention unit. The contact surface contacts an object to be cooled. A flow path through which a refrigerant circulates is formed in the flow path formation unit. The supply unit supplies the refrigerant to the flow path. The discharge unit discharges the refrigerant from the flow path. The retention unit changes the cross-sectional area of the flow path so as to promote local retention of the refrigerant in the flow path.

IPC Classes  ?

• F28F 13/08 - Arrangements for modifying heat transfer, e.g. increasing, decreasing by affecting the pattern of flow of the heat-exchange media by varying the cross-section of the flow channels
• H01L 23/36 - Selection of materials, or shaping, to facilitate cooling or heating, e.g. heat sinks
• H01L 23/427 - Cooling by change of state, e.g. use of heat pipes
• H05K 7/20 - Modifications to facilitate cooling, ventilating, or heating

Abstract

This power conversion device comprises: a three-phase voltage-type inverter for converting a DC voltage from a DC power supply to a three-phase AC voltage and outputting the three-phase AC voltage to a power system; an addition value calculation unit for deriving an addition value of the maximum phase and the minimum phase of a first output voltage command signal that is a sinusoidal three-phase output voltage command signal in the three-phase AC voltage; an effective value calculation unit for deriving an effective value of an output voltage command on the basis of the three-phase first output voltage command signal; a coefficient determination means for determining a coefficient with which the power loss of the three-phase voltage-type inverter is minimized, on the basis of the effective value derived by the effective value calculation unit, the value of the DC voltage, and an output power factor command that corresponds to an output request directed to the power system; a control quantity calculation unit for deriving a control quantity by multiplying the addition value derived by the addition value calculation unit and the coefficient determined by the coefficient determination means; an output voltage command signal control unit for deriving a second output voltage command signal that is obtained by subtracting the control quantity derived by the control quantity calculation unit from each three-phase first output voltage command signal; and a PWM control unit for generating a gate signal on the basis of the second output voltage command signal derived by the output voltage command signal control unit and a triangle-wave-form carrier signal.

IPC Classes  ?

• H02M 7/48 - Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode

Abstract

This power conversion device comprises a direct current-side terminal and a heat dissipation member. The heat dissipation member is electrically conductive. The heat dissipation member is provided to the direct current-side terminal.

IPC Classes  ?

• H02M 7/48 - Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode

Abstract

A fan unit (60) is arranged on the upper surface of a housing (50) and includes a fan, a frame member (66), and a support member. The frame member (66) is arranged so as to surround the outer periphery of an opening formed in the upper surface (50A) of the housing (50). The support member supports the fan above the opening while fixed to the frame member (66). A gap is formed between the lower edge of a first surface (66A) of the frame member (66) and the upper surface (50A) of the housing (50). A first closing member (70) is connected so as to be vertically slidable with respect to the first surface (66A) of the frame member (66). The first closing member (70) is configured so as to close the gap while in contact with the upper surface (50A) of the housing (50). At least one second closing member (90) is configured so as to be inserted into the interior of the frame member via the gap while the gap is exposed and thereby close the opening in the upper surface (50A) of the housing (50).

IPC Classes  ?

• H02J 9/06 - Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over
• H02M 7/48 - Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode

Abstract

This control device is a control device of a power conversion device having, in an output side of an inverter, at least one AC capacitor that is separated from a circuit in the case of a failure, and comprises: a current component extraction unit which acquires a value of a current flowing through the AC capacitor at the time of a synchronous control that synchronizes an output voltage of the inverter with a system voltage of a system side, the synchronous control being performed at the time of starting the power conversion device in a state where a system-side AC switch is open, and which extracts a value of the current component of which a frequency is synchronized with the output voltage of the inverter among current values; a failure determining unit which compares the magnitude of the current component value extracted by the current component extraction unit and a prescribed decision value, and, in the case where the current component value is smaller than the prescribed decision value, determines a failure of the AC capacitor; and a failure information alarm unit which issues an alarm on failure information about the AC capacitor when the failure determining unit determines the failure of the AC capacitor at the time of the synchronous control.

IPC Classes  ?

• H02M 7/48 - Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode

Abstract

This excessive temperature detection system detects a temperature anomaly of a dry-type transformer (hereinafter referred to as transformer) cooled by means of a cooling device. The excessive temperature detection system comprises a temperature determining unit. The temperature determining unit determines and outputs the temperature anomaly of the transformer in place of a determination condition of the temperature anomaly of the transformer according to whether the operation states of the cooling device are in operation or are stopped.

IPC Classes  ?

• H01F 27/00 - MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES - Details of transformers or inductances, in general
• H01F 27/08 - Cooling; Ventilating

Abstract

An AC/DC converter (42) converts an AC voltage supplied from an AC power supply (30) or an AC voltage supplied to a load (31) into a first DC power supply voltage. A power supply line (16) transmits the first DC power supply voltage to a plurality of power conversion modules (P) and a bypass module (B0). The bypass module (B0) includes: a switch (20) connected between the AC power supply (30) and the load (31); and a first control device (28) operating by receiving an operation power supply voltage based on the first DC power supply voltage and thereby controlling the on/off of the switch (20). The power conversion modules (P) each include: a power converter converting the power supplied from the AC power supply (30) or a power storage device (32) into an AC power and supplying the AC power to the load (31); and a second control device (14) operating by receiving an operation power supply voltage based on the first DC power supply voltage and thereby controlling the power converter.

IPC Classes  ?

• H02J 9/06 - Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over

Abstract

A drip prevention structure for a fan according to this embodiment comprises a housing, at least one opening/closing member, and a restricting member. The housing accommodates the fan. The at least one opening/closing member opens and closes a ventilation aperture in accordance with the blowing force of the blowing of the fan, said ventilation aperture being formed in the housing. The restricting member restricts the extent to which the ventilation aperture is opened by the opening/closing member.

IPC Classes  ?

• F04D 29/46 - Fluid-guiding means, e.g. diffusers adjustable
• F04D 29/56 - Fluid-guiding means, e.g. diffusers adjustable

Abstract

According to an embodiment of the present invention, provided is a speed control device for an electric motor, said device comprising: a first computation means for supplying a first speed reference to a first variable speed control device that controls the speed of a first electric motor which drives a table roll of a first transport table; and a second computation means. The second computation means is for: supplying a second speed reference to a second variable speed control device that controls the speed of a second electric motor which drives a table roll of a second transport table disposed downstream of the first transport table; calculating the transport speed of a transported rolled material as a target transport speed; calculating a fastest acceleration/deceleration time on the basis of actual speed data of the second electric motor, the target transport speed, and a pre-set electric motor parameter; generating a speed reference pattern on the basis of the actual speed data, the target transport speed, and the fastest acceleration/deceleration speed time; and supplying the generated speed reference pattern to the second variable speed control device as the second speed reference.

IPC Classes  ?

• B21B 39/12 - Arrangement or installation of roller tables in relation to a roll stand

Abstract

This busbar module is disposed across a plurality of housings and distributes DC power to smoothing capacitors and power conversion units. The busbar module comprises a first conductor and a second conductor. The first conductor is applied to either a DC first electrode or a DC second electrode. The second conductor is connected in parallel with the first conductor. The first conductor includes a first flat plate portion formed with a first thickness in a cross-section vertical to the extending direction. The second conductor includes a second flat plate portion having a bent cross-section forming a predetermined angle in a cross-section vertical to the extending direction and formed with a second thickness thinner than the first thickness.

IPC Classes  ?

• H02M 7/48 - Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode

Abstract

The abnormality detection device according to one embodiment is an abnormality detection device for detecting an abnormality in a rolling system for rolling a material according to a prescribed process, the abnormality detection device comprising a pre-process feature determination unit for determining whether or not the material prior to the prescribed process satisfies a prescribed feature, a post-process feature determination unit for determining whether or not the material after the prescribed process satisfies the prescribed feature, an intervention manipulated variable extraction unit for extracting a manipulated variable of an intervention by an operator with respect to the prescribed process, a determination unit for determining that an abnormality has occurred in the prescribed process when at least the post-process feature determination unit has determined that the prescribed feature is satisfied and the manipulated variable extracted by the intervention manipulated variable extraction unit exceeds a predetermined manipulated variable, and an output unit for outputting a result determined by the determination unit.

IPC Classes  ?

• G05B 23/02 - Electric testing or monitoring
• B21B 38/00 - Methods or devices for measuring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product

Abstract

A power conversion device according to the present invention comprises a first relay unit, one or more second relay units, and a safety control unit. The first relay unit comprises a first logical processing unit that sends, to an upstream side, a response signal from a first power conversion unit and a response signal from a further downstream side than a host first relay unit. Each of the one or more second relay units includes a second logical processing unit that sends, to a further upstream side than the one second relay unit, a response signal from one second power conversion unit of the one or more second power conversion units and a response signal from a further downstream side than the one second relay unit. The safety control unit is disposed at an upstream side of the first logical processing unit, implements functional safety control of the first power conversion unit and the one or more second power conversion units by sending a control command for functional safety control to the first relay unit, and monitors the state of functional safety control of the first power conversion unit and the state of functional safety control of the one or more second power conversion units.

IPC Classes  ?

• H02M 7/48 - Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode

Abstract

A partition member (150) is located in a gap part between a back surface of a housing (110) and outer surfaces of a plurality of units (20, 30). A first partition part (150A) is located at a boundary part of two units adjacent to each other in the vertical direction and extends in the left-right direction. Second and third partition parts (150B, 150C) are connected to respective ends of the first partition part (150A) in the left-right direction, and extend toward a top surface (110A). The air discharged from a first unit group above the first partition part (150A) flows through a first ventilation path and is guided to the top surface (110A). The air discharged from a second unit group below the first partition part (150A) flows through a second ventilation path and is guided to the top surface (110A). A first fan unit (120) is located at a downstream end of the first ventilation path, and second and third fan units (122, 124) are located at downstream ends of a second ventilation path.

IPC Classes  ?

• H02M 7/48 - Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode

Abstract

According to one aspect of the present invention, a power conversion device that comprises a 3-level TNPP circuit is characterized by having a voltage detection unit that detects the voltage between a direct-current positive electrode and a direct-current neutral point, the voltage between the direct-current neutral point and a direct-current negative electrode, and the voltage between the direct-current positive electrode and the direct-current negative electrode, a test pulse outputting unit that, when the voltages detected by the voltage detection unit have risen above a prescribed threshold value, outputs a test pulse to an inside switching element that is connected in the forward direction from the direct-current neutral point toward an alternating-current output terminal, and a determination unit that, when the voltage between the direct-current neutral point and the direct-current negative electrode as detected by the voltage detection unit drops when the test pulse outputting unit has outputted the test pulse to the inside switching element that is connected in the forward direction from the direct-current neutral point toward the alternating-current output terminal, determines that a short circuit failure has occurred at an outside switching element that is connected to the direct-current negative electrode.

IPC Classes  ?

• H02M 7/487 - Neutral point clamped inverters

Abstract

A drawing creation device generates HMI configuration data for a system monitoring screen from a network configuration diagram drawn using drag and drop. An HMI server device executes a system monitoring process by applying HMI configuration data to a predetermined server runtime library, and transmits a display signal according to the communication state of the device to be monitored. An HMI client device draws a system monitoring screen on the web browser, and changes the display state of the parts arranged on the system monitoring screen in response to the received display signal. According to the present invention, the system monitoring function of an industrial plant can be graphically implemented via non-programming.

IPC Classes  ?

• G05B 23/02 - Electric testing or monitoring

Abstract

This SCADA web HMI client device executes a plurality of web browsers communicating with a web server. A first web browser is displayed on a first monitor and renders an HMI screen for monitoring and controlling an industrial plant. A second web browser is displayed on a second monitor, and renders an HMI screen. An operation rights table is acquired from the web server. In the operation rights table, when operation of the HMI screen is not allowed for the first web browser, operation parts arranged in the HMI screen of the first web browser are rendered in an inoperable state. In the operation rights table, when operation of the HMI screen is allowed for the second web browser, operation parts arranged in the HMI screen of the second web browser are rendered in an operable state.

IPC Classes  ?

• G05B 23/02 - Electric testing or monitoring
• G06F 3/14 - Digital output to display device

Abstract

Provided is an external storage device for a power conversion system control device to which data from a power converter can be written even by a small capacity program. This external storage device for a power converter control device comprises: a plurality of file storage regions each for storing data from a power conversion system; and a file management region for managing data for which a format that does not use a file system applied to a terminal device is set as a format for storing the data of the plurality of file storage regions.

IPC Classes  ?

• H02M 7/48 - Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode

Abstract

A power conversion device (100) is connected to a transmission line (115) to which a generator (110) is connected. The power conversion device (100) comprises: a frequency detector (10) that detects a grid frequency, which is the frequency of AC voltage on the transmission line; a control device (15) that generates a reactive power command value to compensate for fluctuations in the detected grid frequency; and a power converter (50) that outputs, to the transmission line (115), reactive power according to the reactive power command value.

IPC Classes  ?

• G05F 1/70 - Regulating power factor; Regulating reactive current or power
• H02J 3/16 - Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load by adjustment of reactive power

Abstract

A data collection device according to one aspect of the present invention comprises: a first data acquisition unit that acquires rolling performance data at each of a plurality of different positions in a rolling direction of a material rolled in a preceding step; a second data acquisition unit that acquires rolling performance data at each of a plurality of different positions in the rolling direction of the material rolled in the following step; an alignment unit that associates and aligns, on the basis of the rolling performance data which has been acquired by the first data acquisition unit and the rolling performance data which has been acquired by the second data acquisition unit, each of the plurality of different positions in the rolling direction of the material rolled in the preceding step and a corresponding one of the plurality of different positions in the rolling direction of the material rolled in the following step; a generation unit that, with respect to each of the plurality of different positions in the rolling direction of the material which have been aligned by the alignment unit, generates rolling performance data for each identical point of the material; and a storage unit that stores the rolling performance data of each identical point of the material.

IPC Classes  ?

• B21B 38/00 - Methods or devices for measuring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product
• B21B 38/04 - Methods or devices for measuring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product for measuring thickness, width, diameter or other transverse dimensions of the product

Abstract

Provided is a control device for power conversion devices, characterized by comprising: a conversion value calculation unit which acquires the current value of a current flowing through an AC capacitor connected to a capacitor circuit in an AC-side output circuit of an inverter circuit, and converts the current value to determine a prescribed conversion value; and a malfunction detection unit which compares the conversion value determined by the conversion value calculation unit and a prescribed determination value used for malfunction detection, to detect malfunctioning of the AC capacitor.

IPC Classes  ?

• H02M 7/48 - Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode

Abstract

In the present invention, a preset calculation, cooling history management, a feed-forward calculation, and a feedback calculation are performed. In the preset calculation, a plurality of cooling banks are set as a feed-forward bank or a feedback bank. In the preset calculation, respective water injection amounts for each of the above banks is calculated. In the cooling history management, a recalculation position for re-running a feedback calculation is set. In the feedback calculation, when a segment reaches the recalculation position, a temperature correction value for compensating for a delay due to the transportation time from the position of the feedback bank to the position of an exit-side thermometer and a response delay of the feedback bank is calculated. In the feedback calculation, the water injection amounts for the feedback bank calculated in the preset calculation are changed, for each segment, on the basis of an exit-side temperature target value, an exit-side temperature actual value calculated for each segment, a recalculated exit-side temperature prediction value, and the temperature correction value.

IPC Classes  ?

• B21B 37/44 - Control of flatness or profile during rolling of strip, sheets or plates using heating, lubricating or water-spray cooling of the product
• B21B 37/76 - Cooling control on the run-out table

Abstract

A bidirectional chopper (5) selectively executes charging operations of storing part of direct current electric power generated by a converter (3) in an electrical storage device (22), and discharging operations of supplying direct current electric power of the electrical storage device (22) to an inverter (8). A control circuit controls the bidirectional chopper (5) to execute discharging operations at a time of power outage of an electric power system (20). The control circuit controls the bidirectional chopper (5) on the basis of a system frequency detected by a frequency detector when the electric power system (20) is sound. The control circuit controls the bidirectional chopper (5) to execute charging operations in accordance with the system frequency rising, and also to execute discharging operations in accordance with the system frequency falling.

IPC Classes  ?

• H02J 9/06 - Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over
• H02J 3/32 - Arrangements for balancing the load in a network by storage of energy using batteries with converting means

Abstract

The purpose of the present invention is to provide a SCADA web HMI system capable of reducing the processing load of input/output signals in a large-scale system. An HMI server machine according to the present invention executes three filtering processes. A first filtering process extracts a set of input/output signals from received block data when the received block data corresponds to a screen currently displayed on a web browser. A second filtering process extracts, from the set of input/output signals extracted by the first filtering process, input/output signals having values changed from the previous values. A third filtering process extracts, from the input/output signals extracted by the second filtering process, input/output signals corresponding to display parts arranged on the screen currently displayed on the web browser.

IPC Classes  ?

• G06Q 10/00 - Administration; Management
• G05B 19/05 - Programmable logic controllers, e.g. simulating logic interconnections of signals according to ladder diagrams or function charts
• G05B 23/02 - Electric testing or monitoring
• G06F 13/00 - Interconnection of, or transfer of information or other signals between, memories, input/output devices or central processing units

Abstract

A power conversion unit (6) includes a plurality of arms (4, 204) each having a plurality of converter cells (10) connected to each other in cascade. A converter control unit (7) that controls the power conversion unit (6) includes: a voltage-instruction-value computation unit (100) that computes an output-voltage instruction value (Vuo, Vvo, Vwo) for each of the arms (4); and a gate-signal generation unit (110) that generates an on/off control signal for each switching element (13) in each of the converter cells (10) in accordance with the output-voltage instruction value (Vuo, Vvo, Vwo). A voltage-instruction-value computation unit (300) is configured so as to generate the output-voltage instruction value (Vuo, Vvo, Vwo) in association with compensation of an AC vibration component, identified for each of the arms (4), of the stored energy of a power storage element (15) in each of the plurality of converter cells (10) contained in the arm (4).

IPC Classes  ?

• H02M 7/49 - Combination of the output voltage waveforms of a plurality of converters

Abstract

The purpose of the present disclosure is to provide an inspection method capable of determining the bonding state of an electrode, which is an object to be inspected to, to a substrate without contacting the electrode. A probe (1) with a built-in coil to which an AC current is being applied is scanned along the formation direction of an electrode lead (40) which is an object to be inspected. During scanning, the probe (1) with a built-in coil is positioned above the surface of the electrode lead (40) at a predetermined distance therefrom without contacting the electrode lead (40). A plurality of detection signals corresponding to a plurality of ultrasonic joints (41) are obtained by an eddy current measuring device (3). Finally, the bonding state of the electrode lead (40) to a substrate (30) is determined based on the result of comparison between each of the plurality of detection signals and a reference level. That is, it is determined whether each of the plurality of ultrasonic joints (41) provided on the electrode lead (40) is in an unbonded state, a fractured state, or a normal state.

IPC Classes  ?

• G01N 27/90 - Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws using eddy currents

Abstract

This drive device comprises: a transformer; a power converter; and a control device. The transformer comprises a primary winding and a secondary winding. A winding of an electric motor is connected to the secondary winding. The power converter conducts current to the primary winding of the transformer. The control device reduces fluctuations in the current flowing in the primary winding of the transformer by means of constant-current control of the power converter during a first-stage period after startup of the electric motor is instructed, and controls the power converter through variable-voltage/variable-frequency control of the electric motor in a second stage after the first stage.

IPC Classes  ?

• H02P 27/04 - Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage

Abstract

The purpose of the present invention is to provide a SCADA web HMI system with which it is possible to reduce the processing load of alarm signals in a large-scale system. An HMI server executes a buffering process and an alarm filtering process. In the buffering process, if a collection of alarm signals is included in received block data, at least the collection of alarm signals included in the block data is temporarily accumulated in an alarm buffer memory. In the alarm filtering process, a collection of alarm signals accumulated in the alarm buffer memory is taken out every second period longer than a first period, and an alarm signal, from among the collection of alarm signals taken out, for which the value has changed since the previous value, is extracted.

IPC Classes  ?

• G06Q 10/00 - Administration; Management
• G05B 19/05 - Programmable logic controllers, e.g. simulating logic interconnections of signals according to ladder diagrams or function charts
• G05B 23/02 - Electric testing or monitoring
• G06F 13/00 - Interconnection of, or transfer of information or other signals between, memories, input/output devices or central processing units

Abstract

The electric motor speed control device of an embodiment comprises a rotor speed calculation unit, an FFT analysis processing unit, a speed compensation calculation unit, and a speed control unit. The rotor speed calculation unit calculates, on the basis of a pulse sequence in a signal output by a rotary encoder, a speed detection value ωFBK that is an index indicating the speed of the rotor of an electric motor. The FFT analysis processing unit outputs the FFT analysis result of the speed detection value ωFBK. The speed compensation calculation unit compensates the speed detection value ωFBK on the basis of the FFT analysis result of the speed detection value ωFBK during a constant speed operation period, thereby generating an estimated value of the rotational speed of the electric motor during the constant speed operation period and setting the speed detection value ωFBK as an estimated value of the rotational speed of the electric motor when outside the constant speed operation period. The speed control unit performs the speed control of the electric motor so that the deviation between a speed command value for the electric motor and the estimated value of the rotational speed becomes small.

IPC Classes  ?

• H02P 29/00 - Arrangements for regulating or controlling electric motors, appropriate for both AC and DC motors
• H02P 6/17 - Circuit arrangements for detecting position and for generating speed information

Abstract

A plurality of semiconductor switches (SW1-SWn) and a mechanical switch (12) are connected in series between a first terminal (T1) and a second terminal (T2). A plurality of voltage detectors (15) are provided corresponding to the plurality of semiconductor switches (SW1-SWn) and detect the terminal voltage of the corresponding semiconductor switch. A plurality of drive circuits (GD1-GDn) are provided corresponding to the plurality of semiconductor switches (SW1-SWn) and turn off the corresponding semiconductor switch in response to a control signal from a main control unit (40). Each of the drive circuits determines whether the terminal voltage of the corresponding semiconductor switch and the terminal voltage of one other semiconductor switch from among the plurality of semiconductor switches are the same, and outputs the determination results. The main control unit (40) detects a shut-off abnormality, in which the plurality of semiconductor switches (SW1-SWn) are not turned off normally, on the basis of the determination results provided by each of the plurality of drive circuits (GD1-GDn).

IPC Classes  ?

• H02J 9/06 - Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over

Abstract

An AC switch (SW) has a semiconductor switch (13) and a snubber circuit (SN) that are connected in parallel with one another between a first terminal (T1), which is connected to an AC power source (1) via a breaker (5), and a second terminal (2), which is connected to a load (2). A power converter (14) is connected between a power storage device (3) and the second terminal (T2). A current detector (15) detects a current flowing to the AC switch (SW). A voltage detector (16) detects an AC voltage that is inputted to the first terminal (T1). When the AC power source (1) is normal, a control device (20) turns on the semiconductor switch (13) and supplies, to the load (2), AC power which is supplied from the AC power source (1). Furthermore, when it has been detected that the breaker (5) is open, the control device (20) controls the power converter (14) such that a current of the opposite phase from the current detected by the current detector (15) flows to the semiconductor switch (13) and AC power is supplied to the load (2). The control device (20) turns off the semiconductor switch (13) when the amplitude of the detected value from the current detector (15) is 0.

IPC Classes  ?

• H02J 7/34 - Parallel operation in networks using both storage and other dc sources, e.g. providing buffering

Abstract

The purpose of the present disclosure is to provide a separation device for solar panels, the separation device being capable of relatively easily separating a solar cell or a noble metal contained in the solar cell from a solar panel part to be heated. According to the present disclosure, a first heating mechanism, which comprises a heating chamber (21) for cell separation and a local heating mechanism (23), separates a plurality of solar cells (1) from a PV panel part (90) to be heated by performing a first local heating process with respect to the PV panel part (90) to be heated. A second heating mechanism, which comprises a heating chamber (22) for noble metal separation and a local heating mechanism (24), separates a noble metal (8), namely silver from the solar cells (1) by performing a second local heating process with respect to the solar cells (1).

IPC Classes  ?

• B09B 3/00 - Destroying solid waste or transforming solid waste into something useful or harmless

Abstract

The learning control device according to an embodiment of the present invention calculates a predicted value on the basis of an actual value measured in a rolling process, calculates an instantaneous value of a learning rate on the basis of the difference between the calculated predicted value and the actual value of the rolling process, calculates an updated value of the learning rate on the basis of the instantaneous value of the learning rate and a previous value of a cell having corresponding rolling conditions in a learning rate table, updates the learning rate of the cell having the corresponding rolling conditions in the learning rate table, identifies an occurrence time of a sudden change in the learning rate on the basis of the instantaneous value of the learning rate stored in a rolling information database, detects a deviation from a standard of the instantaneous value of the learning rate before and after the occurrence time of the sudden change in the learning rate as a learning rate sudden change component, and re-updates the learning rate in the learning table by a correction based on the instantaneous value of the learning rate stored in the rolling information database at and after the identified occurrence time of the sudden change of the learning rate and on the learning rate sudden change component.

IPC Classes  ?

• G05B 23/02 - Electric testing or monitoring
• B21B 37/00 - Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
• G05B 13/02 - Adaptive control systems, i.e. systems automatically adjusting themselves to have a performance which is optimum according to some preassigned criterion electric

Abstract

An AC-DC conversion device (PCS) according to an embodiment is characterized by comprising: an inverter circuit for performing conversion between a DC electric power of a storage battery and an AC electric power; a command value acquiring unit for acquiring a command value from a higher-level device to charge or discharge the storage battery; a DC voltage acquiring unit for acquiring a DC voltage on the storage battery side; and a limiter processing unit for setting, on the basis of the DC voltage acquired by the DC voltage acquiring unit, an upper limit and a lower limit of the command value acquired by the command value acquiring unit.

IPC Classes  ?

• H01M 10/42 - Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
• H01M 10/44 - Methods for charging or discharging
• H01M 10/48 - Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte
• H02J 7/00 - Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
• H02J 3/38 - Arrangements for parallelly feeding a single network by two or more generators, converters or transformers

Abstract

A fluid verification pipe according to this embodiment comprises a pipe body, a verification window, and a verification plate. The pipe body is positioned along a horizontal direction, and a fluid flows in the interior thereof. The verification window is provided in an upper section of a circumferential wall of the pipe body, and allows visual verification of the interior of the pipe body from the exterior of the pipe body. The verification plate is provided to an inner circumferential surface of the pipe body, alongside the verification window and in a freely rotatable manner, hangs down under the own weight of the verification plate, and, receiving the pressure of the fluid, rises up so as to block the verification window.

IPC Classes  ?

• F16L 55/00 - Devices or appurtenances for use in, or in connection with, pipes or pipe systems

Abstract

This uninterruptible power supply device comprises a plurality of power conversion modules (P) and a bypass module (B0) which are connected in parallel with each other between an AC power supply (30) and a load (31). The power conversion modules (P) each include: a first terminal (T1) receiving AC power from the AC power supply (30); a second terminal (T2) connected to a power storage device (32); a third terminal (T3) for outputting the AC power to the load (31); a converter; an inverter; and a first control circuit (14). The bypass module (B0) includes: a switch (20) connected between the AC power supply (30) and the load (31); a first voltage detector (22) for detecting the AC voltage applied to the first terminal (T1); a second voltage detector (24) for detecting DC voltage applied to the second terminal (T2); a third voltage detector (26) for detecting the AC voltage applied to the third terminal (T3); and a second control circuit (28). The second control circuit (28) is communication-connected to the first control circuit (14) and transmits the detection results of the first to third voltage detectors (22, 24, 26) to the first control circuit (14). The first control circuit (14) controls the converter and the inverter using the detection results of the first to third voltage detectors (22, 24, 26) transmitted from the second control circuit (28).

IPC Classes  ?

• H02J 9/06 - Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over
• H02M 7/493 - Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode the static converters being arranged for operation in parallel

Abstract

A substrate unit according to an embodiment of the present invention comprises a plurality of substrates and a holding unit. The plurality of substrates are arranged at fixed intervals in a thickness direction. The holding unit holds the plurality of substrates in an integral manner and allows one of the plurality of substrates to move relative to the other substrate along the planar direction of the substrates.

IPC Classes  ?

• H05K 1/14 - Structural association of two or more printed circuits
• H05K 3/36 - Assembling printed circuits with other printed circuits
• H05K 7/14 - Mounting supporting structure in casing or on frame or rack

Abstract

The power conversion system of the present invention converts DC power supplied from a solar power generation facility into three-phase AC power, and comprises an open delta connection transformer that is connected to an AC power system, a first multiplexing inverter device, and a second multiplexing inverter device. The first multiplexing inverter device and second multiplexing inverter device each have a plurality of three-phase inverters connected in parallel, wherein output terminals of the plurality of three-phase inverters are connected to one another in each common phase via an AC reactor, and a DC capacitor is connected in parallel to input terminals of the plurality of three-phase inverters. The first multiplexing inverter device comprises an input unit that is connected to a first solar power generation facility, and an output unit that is connected to one end of a primary winding of each phase of the open delta connection transformer. The second multiplexing inverter device comprises an input unit that is connected to a second solar power generation facility, and an output unit that is connected to the other end of the primary winding of each phase of the open delta connection transformer.

IPC Classes  ?

• H02M 7/493 - Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode the static converters being arranged for operation in parallel

Abstract

This power conversion device (100) comprises a housing (2), a door (3), an electric power converter (1), and a movable part (5). The housing (2) includes an opening (OP) and an interior space (IS). The door (3) is connected to the housing (2). The electric power converter (1) is arranged in the interior space (IS) so as to be spaced apart from the housing (2). The movable part (5) is arranged in the interior space (IS). The movable part (5) is configured so as to be detachable with respect to the electric power converter (1). The door (3) is configured so as to be capable of switching between an open state in which the opening (OP) is open, and a closed state in which the opening (OP) is closed. The electric power converter (1) is configured so as to be grounded via the movable part (5) while the door (3) is in the open state. The electric power converter (1) is configured so as to be arranged spaced apart from the movable part (5) while the door (3) is in the closed state.

IPC Classes  ?

• H05K 5/02 - Casings, cabinets or drawers for electric apparatus - Details
• H02M 7/48 - Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode

Abstract

Provided is a device for controlling meander in a continuous rolling mill with which it is possible to hold the center line of a material subject to rolling at the center line of a continuous rolling mill, in a steady rolling state, without fostering a deterioration in the shape or the flatness of the material subject to rolling. A common meander information estimation unit estimates, from the meander amount, an item of common meander information indicating the meander tendency of the material subject to rolling, in the continuous rolling mill, as a whole. A reduction levelling correction amount computation unit calculates a reduction levelling correct amount for all rolling stands having correlation on the basis of the common meander information. A reduction levelling control unit applies an ith reduction levelling correction amount to the ith rolling stand (2 ≤ i ≤ N) when, in a steady rolling state, the rolling site on the material subject to rolling rolled by the first rolling stand to which a first reduction levelling correction amount is applied reaches the ith rolling stand.

IPC Classes  ?

• B21B 37/00 - Control devices or methods specially adapted for metal-rolling mills or the work produced thereby

Abstract

Provided is a power conversion device comprising: a main circuit part having a power conversion unit for converting inputted power to alternating current, and a filter circuit for approximating, to a sine wave, the alternating circuit outputted from the power conversion unit; and a control device that, by controlling the working of the power conversion unit, controls the conversion of power by the main circuit part. The control device has an overcurrent suppression control unit that calculates, so as to suppress overcurrent at the output end of the main circuit part, an instantaneous value voltage output command value for each phase of the alternating current outputted from the power conversion unit. This configuration makes it possible to provide a power conversion device capable of suppressing generation of overcurrent even when a voltage control operation has been performed, and a control device for the power conversion device.

IPC Classes  ?

• H02M 7/48 - Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode

Abstract

Provided is a power conversion device comprising: a main circuit unit which has a power conversion unit that converts input power into AC power and a filter circuit that approximates, to a sine wave, the AC power output from the power conversion unit; and a control device which controls the operation of the power conversion unit to control the power conversion by the main circuit unit, wherein the control device has an overcurrent suppression control unit that calculates an instantaneous value voltage output command value for each phase of the AC power output from the power conversion unit, so that an overcurrent is suppressed at an output end of the main circuit unit. Thus, provided are a power conversion device and a control device thereof which are capable of suppressing the occurrence of an overcurrent even when a voltage control operation has been performed.

IPC Classes  ?

• H02M 7/48 - Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode

Abstract

This power conversion system is provided with: a power conversion device for converting power; an enclosure that has an internal space where the power conversion device is accommodated, and that has an air intake port for drawing outside air into the space, an exhaust port for discharging air inside the space to the outside of the space, and a filter provided inside the space so that the outside air drawn in from the air intake port passes therethrough; a fan for discharging the air inside the enclosure from the exhaust port, and drawing outside air into the enclosure from the air intake port; and a maintenance assistance device that has a measurement unit for measuring the extent of clogging of the filter, and a monitoring device for performing an alert operation of alerting that clogging of the filter has been sensed if the extent of clogging of the filter measured by the measurement unit has exceeded a threshold value. Provided thereby are a power conversion system and a maintenance assistance device that make it simple to ascertain the timing for maintenance of the filter.

IPC Classes  ?

• H05K 7/20 - Modifications to facilitate cooling, ventilating, or heating
• H02M 7/48 - Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode

Abstract

A bus connection system according to an embodiment comprises a control device that operates as a first node for a bus, and a bus connection device that is provided between the control device and a first battery pack operating as a second node and is provided between the control device and a second battery pack operating as a second node. The bus connection device includes a first switch provided between the bus and the first battery pack, a second switch provided between the bus and the second battery pack, and a contact switching circuit that sequentially opens and closes the first switch and the second switch. The contact switching circuit generates first identification data indicating that the first switch is closed in a first period during which the first switch is closed, and generates second identification data indicating that the second switch is closed in a second period during which the second switch is closed, so that the first battery pack and the second battery pack can be distinguished from each other.

IPC Classes  ?

• H04L 12/28 - Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
• H04L 12/40 - Bus networks
• H02J 7/00 - Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries

Abstract

This uninterruptible power supply device comprises: switches (S4 to S6) that are turned off when an AC power supply (11) is normal and that are turned on at the time of power failure; a converter (1) that, when the AC power supply is normal, converts AC power supplied from the AC power supply into DC power and supplies the DC power to a DC link unit (2), and that, at the time of power failure, supplies DC power supplied from a battery (13) via the switches to the DC link unit; an inverter (3) that converts DC power from the DC link unit into AC power and supplies the AC power to a load (12); and a chopper circuit (4) that, when the AC power supply is normal, stores DC power from the DC link unit in the battery.

IPC Classes  ?

• H02J 9/06 - Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over

Abstract

Provided is a power converter which suppresses the occurrence of secondary element damage in intact inverter units by suppressing an increase in a DC link voltage by causing a DC fuse to melt quickly when element damage occurs.　A power converter (1) is equipped with: a plurality of inverter units (30) which are connected in parallel to a DC power source (10) comprising a storage battery on the DC side; and a DC fuse (6) which is provided to each electrical circuit between the DC power source and each of the plurality of inverter units, and when a short circuit failure occurs in any unit among the plurality of inverter units, melts in the electrical circuit between the DC power source and the inverter unit where the short circuit failure occurred. The number of inverter units is a number which satisfies the following condition: the plurality of DC fuses between the DC power source and the other inverter units where a short circuit failure has not occurred do not melt when the DC fuse between the DC power source and an inverter unit where a short circuit failure occurred melts.

IPC Classes  ?

• H02M 7/48 - Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
• H02M 7/493 - Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode the static converters being arranged for operation in parallel

Abstract

Provided is an electricity storage system comprising: a plurality of electricity storage devices to and from which DC power can be charged and discharged; a plurality of power conversion devices connected to the plurality of electricity storage devices and a load, supplying power to the load on the basis of the DC power stored in the plurality of electricity storage devices, and charging the plurality of electricity storage devices on the basis of the power on the load side; and a control device for controlling the power conversion operation of the plurality of power conversion devices. The control device determines, on the basis of the total values of the active and reactive powers output from the plurality of power conversion devices, from among the plurality of power conversion devices, the number of power conversion devices to which an operation command is to be sent, sends the operation command to the determined predetermined number of power conversion devices, and sends a wait command to the remaining power conversion devices. This provides an electricity storage system and a control device capable of suppressing power loss.

IPC Classes  ?

• H02J 7/00 - Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
• H02J 3/16 - Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load by adjustment of reactive power
• H02J 3/32 - Arrangements for balancing the load in a network by storage of energy using batteries with converting means

Abstract

A playback simulation test system according to an embodiment comprises: a data collection device which is connected via a first control system network to a first controller that receives feedback signals from equipment and devices constituting an existing plant facility, and that generates control signals for controlling the equipment and devices on the basis of the feedback signals, said data collection device collecting first control data including the feedback signals and the control signals, and generating a first database that stores at least a portion of the first control data; and a data playback device which supplies the at least portion of the first control data to a second controller connected via a second control system network to the data playback device, and performs a simulation of a control system including the equipment, the devices, and the second controller. The data collection device generates a trigger signal on the basis of one or more signals selected from among the feedback signals and the control signals, and collects time-series data of the first control data for a partial period.

IPC Classes  ?

• G05B 23/02 - Electric testing or monitoring

Abstract

An industrial plant operation assist system according to the present invention uses force feedback to perform assistance such that even an inexperienced operator is capable of performing operations appropriate of a skilled individual. This system comprises: an operation switch that transmits an input signal; a programmable logic controller that continuously transmits a work signal; an assist apparatus that transmits an assist signal on the basis of the input signal and the work signal; and a ring-type wearable device that vibrates on the basis of the assist signal. The assist apparatus: calculates the current work status of an industrial plant; extracts, from skillful operation information, an appropriate input value range related to the current work status; and, when an input value contained in the input signal received from the operation switch is not contained in the appropriate input value range, transmits an abnormal signal, as the assist signal, to the ring-type wearable device.

IPC Classes  ?

• G05B 23/02 - Electric testing or monitoring
• G05B 19/048 - Monitoring; Safety
• G05B 19/05 - Programmable logic controllers, e.g. simulating logic interconnections of signals according to ladder diagrams or function charts

Abstract

A drive system (1) drives a multi-phase AC motor (2) having a plurality of windings. The drive system (1) comprises a first power conversion unit (3U), a second power conversion unit (3V), a first conversion control unit (20U), and a second conversion control unit (20V). In the first power conversion unit (3U), current flows to first phase windings of the multi-phase AC motor (2). In the second power conversion unit (3V), current flows to second phase windings of the multi-phase AC motor (2). The first conversion control unit (20U) determines either a three-level phase voltage waveform or a five-level phase voltage waveform based on setting information that specifies the type of phase voltage waveform, and controls the first power conversion unit (3U) to have the determined phase voltage waveform outputted from the first power conversion unit (3U). The second conversion control unit (20V) controls the second power conversion unit (3V) based on the setting information that specifies the type of phase voltage waveform to have the same type of phase voltage waveform as the phase voltage waveform of the first power conversion unit (3U) outputted from the second power conversion unit (3V).

IPC Classes  ?

• H02M 7/483 - Converters with outputs that each can have more than two voltage levels

Abstract

In this uninterruptible power supply, during the switching period for switching from a bypass power supply mode to an inverter power supply mode, an overlap power supply mode is started by activating an inverter (3) in a state in which a semiconductor switch (6) is turned ON, a first electromagnetic contactor (5) is turned OFF and a second electromagnetic contactor (4) is turned ON; the overlap power supply mode is ended by turning the semiconductor switch OFF. Consequently, because it is possible to end the overlap power supply mode quickly, rise in the interterminal voltage (VDC) of a capacitor (Cd) is kept low, and the interterminal voltage of the capacitor can be prevented from exceeding a maximum voltage (VDCH).

IPC Classes  ?

• H02J 9/06 - Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over

Abstract

A power conversion device according to one embodiment is characterized by comprising: an inverter that converts DC power, supplied from a DC power source, to AC power; a determination unit that determines whether or not a negative-phase voltage on the AC side of the inverter is at least a prescribed value; and a stop control unit that performs control so as to stop the inverter when the determination unit has determined that the negative-phase voltage is at least the prescribed value. Furthermore, the stop control unit may also perform control so as to stop the inverter when a positive-phase voltage on the AC side of the inverter is within a prescribed range.

IPC Classes  ?

• H02M 7/48 - Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode

Abstract

A frequency detector (120) detects a system frequency (f) from an AC voltage on an AC electrical path (20) to which power conditioners (30) for system-interconnection with distributed power sources (40) are connected. A power converter (110) is configured to inject advance reactive power or delay reactive power (Qc) into the AC electrical path (20). A controller (150) controls reactive power (Qc) outputted from the power converter (110) such that the delay reactive power is outputted in response to an increase of a system frequency (f) whereas the advance reactive power is outputted in response to a decrease of the system frequency (f).

IPC Classes  ?

• H02J 3/18 - Arrangements for adjusting, eliminating or compensating reactive power in networks

Abstract

Provided is a control device for a hot rolling line, whereby destabilization of cooling in the transition boiling region can be suppressed while maintaining responsiveness of feedback control of winding temperature. The control device controls cooling of rolled stock by an upstream-side bank after a reference value for the target temperature of the rolled stock in feed-forward control of the upstream-side bank has been corrected in accordance with a correction value. The control device controls cooling of the rolled stock by feedback control of a downstream-side bank after a reference value for an amount of cooling water supplied to the rolled stock in feedback control of the downstream-side bank has been corrected in accordance with a correction value calculated by a feedback correction value calculation unit.

IPC Classes  ?

• B21B 37/76 - Cooling control on the run-out table

Abstract

A power conversion system according to an embodiment of the present invention comprises a plurality of converters and a control unit. The plurality of converters are provided so as to be in parallel for each phase of a polyphase alternating-current power system. The control unit uses a plurality of carrier signals having a prescribed mutual phase difference with each other for PWM control of the plurality of converters. An even number of four or more timings is established at prescribed time intervals in a single cycle of a specific carrier signal, and the control unit detects a primary-side electric current of the plurality of converters at each of the even number of four or more timings. The control unit generates a voltage reference for the PWM control using the detected primary-side electric current value and the value of an electric current reference for the primary side, and updates the voltage reference for each of the even number of four or more timings. The control unit controls a specific converter from among the plurality of converters, using the specific carrier signal and the updated voltage reference.

IPC Classes  ?

• H02M 7/49 - Combination of the output voltage waveforms of a plurality of converters

Abstract

In an uninterruptable power supply device (1), a current (Ic) flowing through a capacitor (13) connected to an AC terminal of an inverter (10) is detected during operation of the inverter, a high frequency component of the current is detected, the high frequency component detected at this time is compared with a high frequency component detected when use of the capacitor was started, and whether the end of the life of the capacitor has been reached is determined on the basis of the comparison result. Accordingly, the end of life of the capacitor connected to the AC terminal of the inverter can be determined during normal operation of the inverter. In addition, there is no need to separately provide components such as a switch or a resistor for charging the capacitor, and therefore cost reductions of the device can be achieved.

IPC Classes  ?

• H02M 7/48 - Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode

Abstract

In the polyphase electric motor drive device of an embodiment, a first main circuit is connected to a first winding of a polyphase electric motor, and AC power is supplied to the first winding on the basis of a first pulse width modulation (PWM) signal modulated using a single-phase PWM method. A second main circuit is connected to a second winding, and AC power is supplied to the second winding on the basis of a second PWM signal modulated using the PWM method. A first control unit supplies the first PWM signal, which is based on a first voltage reference and a first carrier signal, to the first main circuit. A second control unit supplies the second PWM signal, which is based on a second voltage reference and a second carrier signal, to the second main circuit. In the first control unit and the second control unit, in which a first AC phase based on the first voltage reference and a second AC phase based on the second voltage reference are in a same-phase relationship or a phase relationship that is comparatively close to the same-phase relationship, the relationship between the first carrier signal phase and the second carrier signal phase is a reverse-phase relationship or a phase relationship that is comparatively close to the reverse-phase relationship.

IPC Classes  ?

• H02P 25/22 - Multiple windings; Windings for more than three phases
• H02P 27/06 - Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters

Abstract

The purpose of the present disclosure is to provide a press working device that maintains the orientation of a workpiece in a normal state during a press working operation. A press working device according to the present disclosure comprises a punch (40) and a cradle (50). The punch (40) has an air hole (45) that passes through the interior thereof. A first suction operation for suctioning a base material (30) or a workpiece (31) with a suction lower surface (48) can be performed by creating a vacuum in the air hole (45). The cradle (50) has an air hole (55) that passes through the interior thereof. A second suction operation for suctioning the workpiece (31) with a suction upper surface (58) can be performed by creating a vacuum in the air hole (55). At least one of the first and second suction operations is performed during a press working operation in which the base material (30) is punched with the punch (40) to obtain the workpiece (31).

IPC Classes  ?

• B21D 45/00 - Ejecting or stripping-off devices arranged in machines or tools dealt with in this subclass
• B21D 28/00 - Shaping by press-cutting; Perforating
• B21D 28/14 - Dies
• B21D 45/04 - Ejecting devices interrelated with motion of tool

Abstract

The purpose of the present disclosure is to provide an active gas generation apparatus that has achieved increased dielectric strength in a power feeding space, without a decrease in the amount of active gas generated. A housing (7) of an active gas generation apparatus (100) of the present disclosure includes a peripheral step region (79) which is provided along an outer periphery of a central bottom surface region (78) and is formed higher than the central bottom surface region (78). A high-voltage electrode dielectric film (1) provided on the peripheral step region (79) provides a gas separating structure for separating a flow of gas between the power feeding space (8) and an active gas generation space including a discharge space (3). A vacuum pump (15) provided outside the housing (7) sets the power feeding space (8) in a vacuum state.

IPC Classes  ?

• H05H 1/24 - Generating plasma

Abstract

The purpose of the present disclosure is to provide an active gas generation device which is structured to jet a high-quality active gas containing no impurities. This active gas generation device (100C) is provided with a gas separation structure in which a flow of the gas between a housing internal space (33) and a discharge space (6C) is divided by a cooling plate (9), an electrode retention member (8), and a high-voltage application electrode part (1C). The active gas generation device (100C) is further provided with an auxiliary metal electrode (12) which is disposed on an upper surface of an electrode dielectric film (11) of the high-voltage application electrode part (1C). The auxiliary metal electrode (12) is disposed so as to overlap with a part of an active gas flow path in a plan view and is set to the ground potential.

IPC Classes  ?

• H05H 1/24 - Generating plasma

Abstract

The purpose of the present disclosure is to provide an active gas generation device having a structure for jetting out good-quality active gas free of impurities. An active gas generation device (100) according to the present disclosure comprises: a base flange (4) having a central bottom region (48) and a peripheral protrusion (46); a cooling plate (9) provided on the peripheral protrusion (46) of the base flange (4); an insulating plate (7) provided between the cooling plate (9) and a high voltage applying electrode unit (1); and an electrode holding member (8) provided on the bottom surface of the cooling plate (9) so as to support the high voltage applying electrode unit (1) from below. The cooling plate (9), the electrode holding member (8), and the high voltage applying electrode unit (1) provide a gas separation structure for separating a gas flow between a housing internal space (33) and a discharging space (6).

IPC Classes  ?

• H05H 1/24 - Generating plasma
• B01J 19/08 - Processes employing the direct application of electric or wave energy, or particle radiation; Apparatus therefor

Abstract

An uninterruptible power supply device (100) comprises: a housing (110) having a rectangular-parallelopiped shape; a plurality of units (10, 20, 30) vertically stacked and stored in the housing (110); and a fan unit (120) having a plurality of fans arranged side by side on the upper surface of the housing (110). Openings (114, 116) for drawing wiring into the housing (110) are respectively formed on the upper and lower surfaces of the housing (110).

IPC Classes  ?

• H02B 3/00 - Apparatus specially adapted for the manufacture, assembly, or maintenance of boards or switchgear

Abstract

When a general-purpose operating part (22, 23) is hidden by a window part (24), visual recognition of a state of correlation between field equipment (10A, 10B) and a hardware switch (3) becomes difficult for an operator. When such a display state occurs, an HMI server (5) stops output of a health check signal to a PLC (6). The PLC (6) detects stoppage of the health check signal, and the state of correlation between the field equipment (10A, 10B) and the hardware switch (3) is forcibly cancelled. Accordingly, human error can be prevented.

IPC Classes  ?

• G05B 23/02 - Electric testing or monitoring

Abstract

This discharge unit according to an embodiment comprises: a drain pan; a discharge section that is insulative; a drain pipe that is grounded; and a liquid separation section that is insulative. The drain pan receives a liquid. The discharge section is connected to the drain pan and discharges the liquid that has accumulated in the drain pan. The liquid separation section prevents the liquid from moving continuously between the discharge section and the drain pipe.

IPC Classes  ?

• H05K 7/20 - Modifications to facilitate cooling, ventilating, or heating
• H02M 1/00 - APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF - Details of apparatus for conversion

Abstract

A capacitor unit (1) includes capacitors (10), a plate-like base portion (20) having a mounting surface (20A), and a locking member (25). The locking member (25) has an axial portion to be inserted into a hole formed in the mounting surface (20A) and a head portion. A first guide member (114A) and a second guide member guide the first and second ends of the base portion (20) in the lateral direction along the front-rear direction. The hole is positioned between the capacitors and the first end in the lateral direction and disposed at a position further away from an opening portion (111) than the first guide member (114A) in the front-rear direction. The locking member (25) touches the first guide member (114A) at a first locking position located when the head portion makes contact with the mounting surface. The locking member (25) is released from touching the first guide member (114A) at a second locking position where the height of the lower end of the head portion is higher than the height of the upper end of the first guide member (114).

IPC Classes  ?

• H02M 7/48 - Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode

Abstract

Provided is a control device for a power converter, the control device being capable of suppressing over-voltage of an output from the power converter when impedance rapidly rises on the output side of the power converter. This control device for a power converter comprises a voltage command value limiting unit that limits the absolute value of each phase component or vector of a voltage command value to a value no greater than a previously set value. According to this configuration, the control device for a power converter limits the absolute value of each phase component or vector of a voltage command value to a value no greater than a previously set value. As a result, over-voltage of the output of the power converter when impedance rapidly rises on the output side of the power converter can be suppressed.

IPC Classes  ?

• H02M 7/48 - Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode

Abstract

This continuous rolling system matches the actual rolling load ratio between all of stands during continuous rolling to a target rolling load ratio. The continuous rolling system tracks a tracking point set on a rolling subject material, which is continuously rolled. The continuous rolling system outputs a rolling gap operational value to an i-th stand when the tracking point reaches the i-th stand, the rolling gap operational value being for making a difference between a value obtained by correcting a target sheet thickness value for the i-th stand with a target sheet thickness correction value for the i-th stand and a value obtained by correcting an actual sheet thickness re-calculation value of the i-th stand with a gap correction value for the i-th stand, to be zero. This gap correction value is a correction value for making a difference between a lead end gap error when the lead end of the rolling subject material reaches the i-th stand and a non-lead end gap error when portions other than the lead end of the rolling subject material reach the i-th stand, to be zero.

IPC Classes  ?

• B21B 37/00 - Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
• B21B 37/20 - Automatic gauge control in tandem mills
• B21B 37/26 - Automatic variation of thickness according to a predetermined programme for obtaining one strip having successive lengths of different constant thickness
• B21B 37/58 - Roll-force control; Roll-gap control