Abstract

In the present invention, a power converter comprises: an inverter that includes a plurality of switching elements, receives DC voltage from a DC voltage source as an input, converts the received DC voltage to variable-voltage, variable-frequency AC voltage, and outputs the converted AC voltage to a load; a control unit that performs PWM control for driving the plurality of switching elements on or off; and a serial arrangement of a positive-electrode-side capacitor and a negative-electrode-side capacitor connected between a positive electrode and a negative electrode of a DC voltage on the input side of the inverter. The output potential of the inverter has at least: the potential of the positive electrode of the DC voltage source; the potential of the negative electrode; and the potential of the neutral point, which is the connection point between the positive-electrode-side capacitor and the negative-electrode-side capacitor. The control unit includes: a modulation factor calculator that calculates the modulation factor of the inverter on the basis of the DC voltage and an output voltage command value; a gate signal generator that compares the calculated modulation factor and a carrier signal and generates a gate signal necessary for on/off-driving of the switching element for generating a pulse train; and a gate signal allocation unit that adjusts the allocation of the gate signals so that the voltage of the positive-electrode-side capacitor and the voltage of the negative-electrode-side capacitor are balanced.

IPC Classes  ?

• H02M 7/487 - Neutral point clamped inverters

Abstract

According to an embodiment, an electric motor drive device includes an electric motor, a main circuit, a current sensor, and a control unit. The electric motor has a plurality of windings. The main circuit transforms power of an alternating current (AC) power supply into AC power and supplies the AC power to each of the plurality of windings. The current sensor detects a load current flowing through each of the plurality of windings. The control unit controls the main circuit on the basis of a current value detected by the current sensor. The control unit controls an amount of power to be supplied from the main circuit to the electric motor on the basis of an amplitude of the load current associated with detection of an undervoltage state of the AC power supply in a state in which the main circuit uses a conversion rule in which an index value for the amplitude of the load current flowing through the plurality of windings is defined.

IPC Classes  ?

• H02P 21/22 - Current control, e.g. using a current control loop
• H02P 27/08 - 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 with pulse width modulation
• H02P 21/34 - Arrangements for starting

Abstract

A bidirectional chopper selectively performs a charging operation and a discharging operation, the charging operation being an operation in which a part of DC power generated by a converter is stored in a power storage device, the discharging operation being an operation in which DC power of the power storage device is supplied to an inverter. A control circuit controls the bidirectional chopper to perform the discharging operation when a power failure of a power system occurs. The control circuit controls the bidirectional chopper based on a system frequency detected by a frequency detector when the power system is normal. The control circuit controls the bidirectional chopper to perform the charging operation in response to an increase in the system frequency, and to perform the discharging operation in response to a decrease in the system frequency.

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

In the present invention, a SCADA web HMI system draws an HMI screen including a first rolled part disposed in a first zone and an extensible second rolled part disposed in a second zone. The first rolled part and the second material part are drawn in each drawing period, which is shorter than the PLC signal receiving period. The first rolled part tip position is calculated on the basis of the conveying speed and elapsed time included in the first PLC signal in each drawing period from the time the first PLC signal is received. The size of the drawn first rolled part is set to the length from the entry side of the first zone to the first rolled part tip position. If the first rolled part tip position has not reached the second zone when the second PLC signal has been received, the size of the drawn first rolled part is set to the length of the first zone.

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

This product quality analysis assistance system is applied to a steel plant. In a first process, a plurality of defective waveform patterns determined to be defective in quality are classified into at least one defective waveform pattern group on the basis of similarity. In a second process, a score of correlation with a condition based on product specifications and a process data waveform pattern is calculated for the defective waveform pattern group. In a third process, when the score of correlation indicating characteristics of the defective waveform pattern group is greater than a condition threshold, an input screen including a representative waveform pattern representing the defective waveform pattern group, information according to the score of correlation, and a factor and countermeasure input area is displayed on a monitor.

IPC Classes  ?

• G06Q 50/04 - Manufacturing

Abstract

This SCADA web HMI system draws an HMI screen including a first strip part disposed in a first zone and an extendable second strip part disposed in a second zone. The first strip part and the second strip part are drawn each drawing cycle shorter than the reception cycle of PLC signals. The tip position of the first strip part is calculated each drawing cycle from the time when a first PLC signal is received, on the basis of a transfer speed and an elapsed time included in the first PLC signal. The drawing size of the first strip part is set to the length from the entry side of the first zone to the tip position of the first strip part. Further, if the tip position of the first strip part has not reached the second zone when a second PLC signal is received, the drawing size of the first strip part is set to the zone length of the first zone.

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 includes a first control device to an m-th control device that are capable of communicating with each other. A k-th control device transmits specific information to control devices other than the k-th control device among the first control device to the m-th control device. The specific information includes voltage values of a plurality of unit converters included in a k-th cell set in each of a first arm to a third arm. From each control device other than the k-th control device among the first control device to the m-th control device, the k-th control device receives specific information including the voltage values of the plurality of unit converters. The k-th control device calculates a phase representative value of the voltage values of the plurality of unit converters included in each of the first arm to the third arm.

IPC Classes  ?

• 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
• H02M 1/084 - Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters using a control circuit common to several phases of a multi-phase system
• H02M 1/12 - Arrangements for reducing harmonics from ac input or output

Abstract

The electric motor speed control apparatus in an embodiment comprises a rotation speed estimation unit and a control unit. The rotation speed estimation unit generates an estimated value of a rotation speed of an electric motor by using a result of FFT analysis of a speed detection signal ωFBK, which is based on a detection result from a resolver for detecting the rotation speed of the electric motor, and the speed detection signal ωFBK. The control unit implements speed control so as to reduce deviation between the estimated value of the rotation speed and a speed command value for speed control of the electric motor.

IPC Classes  ?

• G05B 19/4155 - Numerical control (NC), i.e. automatically operating machines, in particular machine tools, e.g. in a manufacturing environment, so as to execute positioning, movement or co-ordinated operations by means of programme data in numerical form characterised by programme execution, i.e. part programme or machine function execution, e.g. selection of a programme

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

A control system of a power converter includes a plurality of carrier wave generating units which are respectively provided for a plurality of power converters connected between a plurality of DC power supplies and a common AC power supply and which are configured to respectively generate carrier waves on the basis of an AC voltage of the AC power supply. The control system of the power converter can thereby synchronize carrier phases of a plurality of power converters.

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
• H02M 7/537 - 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 using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters

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

The SCADA web HMI client device runs a plurality of web browsers communicating with a web server. A first web browser is displayed on first monitor and draws an HMI screen for monitoring and controlling an industrial plant. A second web browser is displayed on a second monitor and draws the HMI screen. An operation right table is obtained from the web server. If, in the operation right table, the first web browser is not permitted to operate the HMI screen, an operation part positioned on the HMI screen of the first web browser is drawn in an inoperable state. If, in the operation right table, the second web browser is permitted to operate the HMI screen, the operation part positioned on the HMI screen of the second web browser is drawn in an operable state.

IPC Classes  ?

• G05B 19/418 - Total factory control, i.e. centrally controlling a plurality of machines, e.g. direct or distributed numerical control (DNC), flexible manufacturing systems (FMS), integrated manufacturing systems (IMS), computer integrated manufacturing (CIM)

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

In an uninterruptible power supply apparatus, AC current, which includes a feedback component having a value corresponding to deviation between terminal-to-terminal voltage of a capacitor and reference voltage, and a feed forward component obtained by multiplying load current by a gain, is passed into a converter such that the terminal-to-terminal voltage of the capacitor becomes the reference voltage. The gain is set to a first gain in an iverter power feed mode and a bypass power feed mode, and the gain is set to a second gain smaller than the first gain in a switching period of switching between the inverter power feed mode and the bypass power feed mode, to prevent the terminal-to-terminal voltage of the capacitor from exceeding an upper limit voltage in a lap power feed mode.

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 1/14 - Arrangements for reducing ripples from dc input or output
• H02M 1/32 - Means for protecting converters other than by automatic disconnection
• H02M 5/458 - Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
• H02J 3/00 - Circuit arrangements for ac mains or ac distribution networks

Abstract

A control device is a control device of a power conversion device, and includes a conversion value calculation unit that acquires a current value of a current flowing in an alternating-current capacitor connected to a capacitor circuit in an output circuit on an alternating-current side of an inverter circuit and performs conversion of the current value to obtain a predetermined conversion value, and a failure detection unit that compares the conversion value obtained by the conversion value calculation unit and a predetermined determination value to be used in failure detection to detect a failure of the alternating-current capacitor.

IPC Classes  ?

• H02M 7/53846 - Control circuits
• H02M 1/12 - Arrangements for reducing harmonics from ac input or output
• 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 frequency detector detects a system frequency from an AC voltage on an AC power line to which a power conditioner performing system interconnection of a distributed power supply is connected. A power converter is configured to inject lead reactive power or delay reactive power into the AC power line. A controller controls reactive power output from the power converter to output the lead reactive power in response to an increase in the system frequency while outputting the delay reactive power in response to a decrease in the system frequency.

IPC Classes  ?

• H02J 3/00 - Circuit arrangements for ac mains or ac distribution networks
• 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

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

A motor drive system of the embodiment includes a power converter, a state detector, a frequency calculator, a frequency correction command generator, a drive amount limiter, and a speed controller. The power converter drives a motor by PWM control. The state detector detects a drive state of the motor. The frequency calculator detects a size of a specific frequency component which fluctuates according to the drive state by using an index value indicating the drive state. The frequency correction command generator generates a correction command of a carrier frequency used for the PWM control on the basis of a detected result of periodic fluctuation of the drive state. The drive amount limiter limits a drive amount of the motor. The drive amount limiter adjusts an upper limit value of a size of a current caused to flow through windings of the motor in a direction in which the upper limit value is lowered from a predetermined upper limit current value when the carrier frequency is searched for in a direction in which the carrier frequency is increased. The speed controller generates a current reference based on a speed command value and a rotor speed of the motor according to the limitation.

IPC Classes  ?

• H02P 27/08 - 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 with pulse width modulation
• H02P 6/08 - Arrangements for controlling the speed or torque of a single motor

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

A discharge unit of an embodiment includes a drain pan, a discharge portion having an insulation property, a grounded drain piping, and a liquid separation part having an insulation property. The drain pan receives a liquid. The discharge portion is connected to the drain pan and drains the liquid remaining in the drain pan. The liquid separation part prevents the liquid from flowing continuously between the discharge portion and the drain piping.

IPC Classes  ?

• H05K 7/20 - Modifications to facilitate cooling, ventilating, or heating
• H02M 1/32 - Means for protecting converters other than by automatic disconnection

Abstract

A power conversion device with a three-level TNPP circuit, includes: a voltage detection unit; a test pulse output unit that outputs a test pulse to an inner switching device connected in a forward direction from the DC neutral point to an AC output terminal when the voltages detected by the voltage detection unit rise and exceed a predetermined threshold; and a determination unit that determines, when the test pulse output unit outputs a test pulse to the inner switching device connected in the forward direction from the DC neutral point to the AC output terminal, upon drop in the voltage between the DC neutral point and the DC negative electrode detected by the voltage detection unit, that an outer switching device connected to the DC negative electrode has a short circuit failure.

IPC Classes  ?

• H02M 7/487 - Neutral point clamped inverters
• H02M 1/32 - Means for protecting converters other than by automatic disconnection

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

A distributed-power-supply power conversion system includes a plurality of power inverters configured to invert DC power to AC power; and a control device configured to select at least one power inverter from the plurality of power inverters as a power inverter used for testing, and configured to perform an energization test of the power inverter used for testing in a state where an AC side of the power inverter used for testing is disconnected from a system, and is connected to an AC power supply device and to a load bank, and a voltage on the AC side of the power inverter used for testing is established. The distributed-power-supply power conversion system can perform an energization test of a power inverter before a system receives power.

IPC Classes  ?

• H02J 3/38 - Arrangements for parallelly feeding a single network by two or more generators, converters or transformers
• 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
• G01R 31/40 - Testing power supplies

Abstract

A power conversion device includes: a power conversion circuit connected to a direct-current power supply and a power system and configured to perform conversion between direct-current power and alternating-current power; a phase-locked loop circuit configured to output a phase instruction value based on a system alternating-current voltage phase of the power system; and a control circuit configured to control the power conversion circuit based on the phase instruction value from the phase-locked loop circuit. The phase-locked loop circuit includes: a phase difference calculation section configured to calculate a phase difference in a predetermined cycle, the phase difference representing a deviation of the phase instruction value from the system alternating-current voltage phase of the power system; a phase difference correction section; and a phase instruction value generation section configured to output the phase instruction value based on an output of the phase difference correction section.

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 bus connection system according to an embodiment of the invention includes a control device that is connected to one end of a first bus and operates as a first node, and a bus connection device that is located between another end of the first bus and a first battery pack operating as a second node and between the other end of the first bus and a second battery pack operating as the second node. The bus connection device includes a first switch located between the first battery pack and the other end of the first bus, a second switch located between the second battery pack and the other end of the first bus, and a contact switching circuit sequentially opening and closing the first switch and the second switch.

IPC Classes  ?

• G06F 13/36 - Handling requests for interconnection or transfer for access to common bus or bus system
• H02J 7/00 - Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries

Abstract

An object of the present invention is to provide a SCADA web HMI system that can reduce a load for processing an alarm signal in a large-scale system. An HMI server apparatus performs buffering processing and alarm filtering processing. In the buffering processing, in a case where a received block data includes a set of alarm signals, at least the set of alarm signals included in the block data is temporarily stored in an alarm buffer memory. In the alarm filtering processing, the set of alarm signals stored in the alarm buffer memory is taken out for every second period that is longer than a first period, and the alarm signal having a value varied from a previous value is extracted from the taken-out set of alarm signals.

IPC Classes  ?

• G05B 19/042 - Programme control other than numerical control, i.e. in sequence controllers or logic controllers using digital processors

Abstract

In preset calculation, a plurality of cooling banks are set to be feedforward or feedback banks, and each of water injection amounts in these banks is calculated. In cooling history management, a recalculation position for re-executing the feedback calculation is set. In feedback calculation, a temperature correction value for compensating a delay due to a conveyance time period from a position of the feedback bank to a position of a delivery side pyrometer, and a response delay of the feedback bank is calculated, when a segment reaches the recalculation position. In the feedback calculation, each of water injection amounts in the feedback banks that is calculated in the preset calculation is changed for each of segments based on a delivery side temperature target value, a delivery side temperature actual value calculated for each of the segments, a delivery side temperature prediction value that is recalculated, and the temperature correction value.

IPC Classes  ?

• B21B 37/74 - Temperature control, e.g. by cooling or heating the rolls or the product

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

A drawing creating device generates HMI configuration data for a system monitoring screen from a network configuration diagram drawn by drag-and-drop operation. 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 status of a monitored device. An HMI client device draws the system monitoring screen on a web browser and changes the display statuses of the parts positioned on the system monitoring screen according to the received display signal. According to the present invention, the system monitoring function of an industrial plant can be implemented in a non-programmable graphical manner.

IPC Classes  ?

• G05B 19/4097 - Numerical control (NC), i.e. automatically operating machines, in particular machine tools, e.g. in a manufacturing environment, so as to execute positioning, movement or co-ordinated operations by means of programme data in numerical form characterised by using design data to control NC machines, e.g. CAD/CAM
• G06F 3/0486 - Drag-and-drop
• G06T 11/60 - Editing figures and text; Combining figures or text
• G06T 11/20 - Drawing from basic elements, e.g. lines or circles

Abstract

An external storage device for a control apparatus of a power conversion system to which data from a power conversion system can be written even by a program small in size. The external storage device for the control apparatus of the power conversion system includes: a plurality of file storage areas each configured to store data from the power conversion system; and a file management area configured to manage data for setting a format not using a file system applied to a terminal apparatus, as a format for storage of the data in the plurality of file storage areas.

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 conditioning subsystem (PCS) includes an inverter circuit configured to mutually covert direct current (DC) power of a storage battery and alternating current (AC) power, a command value acquiring portion configured to acquire a command value from a higher-level apparatus to charge or discharge the storage battery, a DC voltage acquiring portion configured to acquire a DC voltage on the storage battery side, and a limiter processing portion configured to perform a process of setting to limit each of an upper limit and a lower limit of the command value acquired by the command value acquiring portion on the basis of the DC voltage acquired by the DC voltage acquiring portion.

IPC Classes  ?

• 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

Abstract

When a general-purpose operation part (22, 23) is hidden by a window part (24), it becomes hard for an operator to visually check an association state between a field device (10A, 10B) and a hardware switch (3). If such a display state has occurred, an HMI server (5) stops a health check signal which is being output to a PLC (6). The PLC (6) detects the stop of the health check signal and forcibly cancels the association state between the field device (10A, 10B) and the hardware switch (3). Thus, a human error can be prevented.

IPC Classes  ?

• G05B 19/418 - Total factory control, i.e. centrally controlling a plurality of machines, e.g. direct or distributed numerical control (DNC), flexible manufacturing systems (FMS), integrated manufacturing systems (IMS), computer integrated manufacturing (CIM)

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

Goods & Services

Online data gathering equipment comprising computer hardware, computer software, monitors and surveillance cameras used for industrial plants.

Abstract

An electric power conversion apparatus includes: an electric power conversion circuit that allows a DC terminal to be connected to a DC power source via a DC bus line, and performs at least one of converting DC power of the DC power source into AC power to output, or converting AC power into DC power to output; a DC switch turned on when the electric power conversion circuit performs electric power conversion; an AC switch provided on a side of the AC terminal, and turned on when the electric power conversion circuit performs the electric power conversion; a DC voltmeter that measures a potential at a predetermined portion, on a side of the DC terminal; a ground connection portion that connects the DC bus line and ground potential; and a control circuit connected to the electric power conversion circuit, the DC switch, the AC switch, and the DC voltmeter.

IPC Classes  ?

• H02M 7/5387 - 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 using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration
• G01R 31/52 - Testing for short-circuits, leakage current or ground faults

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

A control device for a power conversion device includes a voltage recognizing unit configured to detect a voltage at a linkage point of the plurality of power converters, and a control unit configured to control an amplitude and a frequency of a voltage to be output by a power converter to be controlled on the basis of active power and reactive power output by the power converter to be controlled in a case that the power converter to be controlled is caused to perform autonomous operation as a voltage source, and controls active power and reactive power to be output by the power converter to be controlled so as to compensate for excess or deficiency of active power and reactive power at the linkage point on a basis of an amplitude and a frequency of the voltage detected by the voltage recognizing unit.

IPC Classes  ?

• H02M 7/5387 - 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 using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration
• 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

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

A power converter includes a converter, an inverter, and a control unit. The converter converts electric power supplied from a power supply side to DC power. The inverter is provided on an output side of the converter. The control unit is configured to calculate a control difference between a target value for a target control voltage in a DC section provided on the output side of the converter and a feedback value using a DC voltage of the DC section as the feedback value, to perform a nonlinear operation process on the control difference, and to calculate an operation value based on a result of the nonlinear operation process and control the converter using the operation value.

IPC Classes  ?

• H02M 5/458 - Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only

Abstract

A semiconductor switch drive device (3) includes a drive unit (10), a power supply unit (20), a switch (39), and a control unit (50). The drive unit (10) supplies a control signal to a semiconductor switch (Q) of a main circuit (2) and drives the semiconductor switch (Q). The power supply unit (20) supplies electric power to the drive unit (10). The switch (39) cuts off supply of electric power to the power supply unit (20) by detecting or controlling an overvoltage state on a primary side of the power supply unit (20). The control unit (50) switches a conductive state of the switch (39) on the basis of a voltage of a control terminal of the semiconductor switch (Q).

IPC Classes  ?

• H02M 1/08 - Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
• H02M 7/539 - 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 using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters with automatic control of output wave form or frequency
• H03K 17/0812 - Modifications for protecting switching circuit against overcurrent or overvoltage without feedback from the output circuit to the control circuit by measures taken in the control circuit

Abstract

A dust-proof structure of an embodiment includes a housing and a magnetic member. The housing accommodates an electric device. The magnetic member is magnetized. The magnetic member is arranged in a flow path of a gas that flows through a ventilation port formed in the housing.

IPC Classes  ?

• H05K 5/02 - Casings, cabinets or drawers for electric apparatus - Details
• H05K 5/03 - Covers

Abstract

An uninterruptible power supply apparatus having a plurality of power conversion modules and a bypass module connected in parallel between an AC power supply and a load. Each of the power conversion modules includes a first terminal that receives AC power from the AC power supply, a second terminal connected to a power storage device, a third terminal for outputting AC power to the load, a converter, an inverter, and a first control circuit. The bypass module includes a switch connected between the AC power supply and the load, a first voltage detector that detects an AC voltage applied to the first terminal, a second voltage detector that detects a DC voltage applied to the second terminal, a third voltage detector that detects an AC voltage applied to the third terminal, and a second control circuit.

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 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

An uninterruptible power supply device includes a housing having a rectangular parallelepiped shape, a plurality of units vertically stacked and accommodated in housing, and a fan unit having a plurality of fans aligned on an upper surface of housing. Each of the upper surface and the lower surface of housing is formed with an opening through which a wire is led into housing.

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 3/38 - Arrangements for parallelly feeding a single network by two or more generators, converters or transformers
• H02J 3/32 - Arrangements for balancing the load in a network by storage of energy using batteries with converting means
• H02B 1/56 - Cooling; Ventilation
• H02B 1/30 - Cabinet-type casings; Parts thereof or accessories therefor

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

A power conversion device is provided, and includes a major circuit part, and a control device; the major circuit part includes a power conversion part converting, into AC power, power that is input, and a filter circuit causing the AC power output from the power conversion part to approach a sine wave; the control device controls power conversion by the major circuit part by controlling an operation of the power conversion part; the control device includes an overcurrent suppression controller; the overcurrent suppression controller calculates instantaneous value voltage output command values of the phases of the AC power output from the power conversion part to suppress an overcurrent at the output end of the major circuit part. Accordingly, a power conversion device and a control device of the power conversion device are provided in which the generation of an overcurrent can be suppressed even when a voltage-controlled operation is performed.

IPC Classes  ?

• H02M 1/32 - Means for protecting converters other than by automatic disconnection
• H02M 7/44 - Conversion of dc power input into ac power output without possibility of reversal by static converters

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

A lock mechanism according to an embodiment includes an engaging portion, a hook, and a pressing portion. The engaging portion is provided in any one of a housing and a door that is configured to open and close a housing opening portion of the housing. The hook is provided in the other one of the housing and the door to be rotatable around a rotation axis, is engageable with the engaging portion, and is normally disengaged from the engaging portion by its own weight. The pressing portion is provided separately from the hook and is configured to press the hook. The hook includes a hook side engaging portion that is configured to engage with the engaging portion with the rotation axis interposed therebetween, and a hook side pressing portion that is configured to cause the engaging portion to engage with the hook side engaging portion by being pressed by the pressing portion.

IPC Classes  ?

• E05C 3/06 - Fastening devices with bolts moving pivotally or rotatively without latching action with operating handle or equivalent member moving otherwise than rigidly with the bolt
• E05C 3/00 - Fastening devices with bolts moving pivotally or rotatively

Abstract

A power storage system includes multiple power storage devices, multiple power conversion devices, and a control device; the multiple power storage devices are capable of discharging and charging DC power; the multiple power conversion devices are connected to the multiple power storage devices and a bad, convert the DC power stored in the multiple power storage devices into power corresponding to the bad, supply the power to the bad based on the DC power stored in the multiple power storage devices, convert power of the load into DC power corresponding to the multiple power storage devices, and charge the multiple power storage devices based on the power of the load side; the control device controls a power conversion operation of the multiple power conversion devices. Accordingly, a power storage system and a control device are provided in which the power loss can be suppressed.

IPC Classes  ?

• H02J 3/38 - Arrangements for parallelly feeding a single network by two or more generators, converters or transformers
• H02J 3/32 - Arrangements for balancing the load in a network by storage of energy using batteries with converting means
• 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

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

Goods & Services

Online data gathering equipment comprising computer hardware, computer software, monitors and surveillance cameras used for industrial plants

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

A power conversion device is provided, and includes a major circuit part and a control device; the major circuit part includes a power conversion part converting, into AC power, power that is input, and a filter circuit causing the AC power output from the power conversion part to approach a sine wave; the control device controls power conversion by the major circuit part by controlling an operation of the power conversion part; the control device includes an overcurrent suppression controller; the overcurrent suppression controller calculates instantaneous value voltage output command values of the phases of the AC power output from the power conversion part to suppress an overcurrent at the output end of the major circuit part. Accordingly, a power conversion device and a control device of the power conversion device are provided in which the generation of an overcurrent can be suppressed even when a voltage-controlled operation is performed.

IPC Classes  ?

• 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
• H02M 1/32 - Means for protecting converters other than by automatic disconnection
• H02M 7/5395 - 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 using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters with automatic control of output wave form or frequency by pulse-width modulation

Abstract

According to an embodiment, a power converter (1) includes a main circuit (10), an electrification control unit (25), and an analysis unit (24). The main circuit includes a plurality of switching devices (Q1 to Q4), converts direct-current power into multiphase alternating-current power through switching of the plurality of switching devices, is able to supply the multiphase alternating-current power to an alternating-current load (2) connected to an output side, and output a detection result of a device short circuit current flowing in each of the plurality of switching devices. The electrification control unit electrifies the plurality of switching devices for a predetermined time based on one of a plurality of pre-decided analysis test electrification patterns. The analysis unit analyzes soundness of the main circuit using a load current flowing from the main circuit to the alternating-current load, a phase voltage output by the main circuit, and data at the time of electrification for the predetermined time with regard to the device short circuit current flowing in each of the plurality of switching devices.

IPC Classes  ?

• H02M 7/5387 - 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 using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration
• H02M 7/53862 - Control circuits using transistor type converters
• H02M 1/32 - Means for protecting converters other than by automatic disconnection
• 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
• H02M 1/084 - Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters using a control circuit common to several phases of a multi-phase system

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

Provided is a deterioration estimation device and a deterioration estimation program for a power conversion device that can estimate the deterioration of a switching element without providing a special sensor. A deterioration estimation device includes a calculating device calculating the variation of the characteristics of an IGBT in an inverter from a voltage command treated as a target of the output voltage of the power conversion device and the output voltage value of the power conversion device, a determining device determining whether the variation of the characteristics calculated by the calculating device has changed from an initial state by a threshold value or greater, and a notifying device issuing a warning when the determining device has determined that the change in the variation of the characteristics is equal to or greater than the threshold value.

IPC Classes  ?

• G01R 31/327 - Testing of circuit interrupters, switches or circuit-breakers
• H02M 7/5395 - 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 using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters with automatic control of output wave form or frequency by pulse-width modulation

Abstract

A substrate unit of an embodiment includes a plurality of substrates and a holding part. The plurality of substrates are arranged at a constant interval in a thickness direction. The holding part integrally holds the plurality of substrates and allows, relative to one substrate of the plurality of substrates, another substrate to be movable along a plane direction of the substrate.

IPC Classes  ?

• H05K 7/02 - Arrangements of circuit components or wiring on supporting structure
• H05K 9/00 - Screening of apparatus or components against electric or magnetic fields

Abstract

A power conversion device including a power conversion circuit, an AC filter circuit, and a calculation unit. The power conversion circuit converts DC input power from a DC power supply to output a first AC output current and a first AC output voltage. The AC filter circuit filters the first AC output current and the first AC output voltage to generate a second AC output current and a second AC output voltage. The calculation unit calculates an estimated value of an upper impedance based on a difference value between a first voltage value and a second voltage value, the first voltage value being a value of the second AC output voltage at a time of stop of the power conversion circuit or at a time of zero output from the power conversion circuit or at a time of a certain amount of output from the power conversion circuit.

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 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 SCADA web HMI system dynamically distributes server connection priority lists from web HMI servers to HMI clients in accordance with order of assignment which takes load balancing into account. As a result, preliminary settings associated with connection priority do not need to be made on the HMI clients. Also, since the server connection priority lists are assigned to the HMI clients in accordance with the order of assignment which takes load balancing into account, the numbers of clients connected to the individual web HMI servers are equalized and the load balancing can be ensured. The SCADA web HMI system can reduce the operating costs necessary in client settings while ensuring redundancy and load balancing of servers.

IPC Classes  ?

• G05B 19/4155 - Numerical control (NC), i.e. automatically operating machines, in particular machine tools, e.g. in a manufacturing environment, so as to execute positioning, movement or co-ordinated operations by means of programme data in numerical form characterised by programme execution, i.e. part programme or machine function execution, e.g. selection of a programme

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 plurality of UPSs are connected in parallel between an AC power supply and a load. The UPSs each include a first switch connected between the AC power supply and an AC node. During the first power feeding mode, a control device turns on the first switch, and controls a power conversion device so as to receive AC power from the AC node and generate AC power. During a second power feeding mode, the control device turns off the first switch, and controls the power conversion device so as to receive DC power from a power storage device and generate AC power. When the AC power supply recovers during the second power feeding mode, the control device successively switches the plurality of UPSs to the first power feeding mode by successively turning on a plurality of the first switches each of which corresponds to each of the plurality of UPSs.

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 1/42 - Circuits or arrangements for compensating for or adjusting power factor in converters or inverters
• H02M 3/335 - Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
• H02J 3/32 - Arrangements for balancing the load in a network by storage of energy using batteries with converting means

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

A power conversion device according to one embodiment has an inverter that converts direct-current power supplied from a direct-current power source to alternating-current power, a determination unit that determines whether or not a negative-phase sequence voltage on an alternating-current side of the inverter is a predetermined value or greater, and a stop control unit that performs control to stop the inverter in a case where the determination unit determines that the negative-phase sequence voltage is the predetermined value or greater. Further, the stop control unit may perform control to stop the inverter in a case where a positive-phase sequence voltage on the alternating-current side of the inverter is within a predetermined range.

IPC Classes  ?

• H02M 1/36 - Means for starting or stopping converters
• H02M 7/53 - 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 using devices of a triode or transistor type requiring continuous application of a control signal

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 power converter includes: plural inverter units connected in parallel to a DC power supply, including a storage battery, on a DC side and a DC fuse in each of current paths between the DC power supply and the inverter units, the DC fuse configured to, when a short-circuit failure occurs in any of the inverter units, be blown in the current path between the DC power supply and the inverter unit having the short-circuit failure. The number of the inverter units is a number with which a condition that, when the DC fuse between the DC power supply and the inverter unit having the short-circuit failure is blown, none of a plurality of the DC fuses between the DC power supply and a plurality of other inverter units that do not have the short-circuit failure are blown is satisfied.

IPC Classes  ?

• H02M 1/36 - Means for starting or stopping converters
• H02M 7/537 - 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 using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters

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

A master device (10) of a drive system (1) transmits identification information of each first period and a first transmission synchronization signal for each first period of a reference period including a plurality of first periods or transmits identification information of each first period, a first transmission synchronization signal, and a second transmission synchronization signal for each first period of the reference period. A first controller (31) adjusts a phase of each first control period such that the first control period is synchronized with a timing associated with a specific first synchronization signal out of a plurality of first synchronization signals which are acquired by reception of the first transmission synchronization signal a plurality of times using the identification information and controls a first power converter. A second controller (32) adjusts a phase of each second control period such that the second control period is synchronized with a timing associated with a specific second synchronization signal out of a plurality of second synchronization signals which are acquired by one of reception of the first transmission synchronization signal a plurality of times and reception of the second transmission synchronization signal a plurality of times using the identification information and controls a second power converter.

IPC Classes  ?

• H02P 5/56 - Speed and position comparison between the motors by electrical means
• H04L 7/04 - Speed or phase control by synchronisation signals

Abstract

An uninterruptible power supply includes a plurality of vacuum circuit breakers and a bypass circuit connected in series between a commercial AC power supply and a load, a control device that turns on both of the plurality of vacuum circuit breakers and the bypass circuit when the commercial AC power supply is normal and turns off a vacuum circuit breaker different from a vacuum circuit breaker turned off on the occurrence of previous power failure of the plurality of vacuum circuit breakers and turns off the bypass circuit when the commercial AC power supply fails, and a power converter that converts DC power of a battery into AC power and supplies AC power to the load when the commercial AC power supply fails.

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 7/00 - Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries

Abstract

An active gas generation apparatus according to the present disclosure includes: a base flange having a central bottom surface region and a peripheral protruding part; a cooling plate provided on the peripheral protruding part of the base flange; an insulating plate provided between the cooling plate and the high voltage apply electrode part; and an electrode holding member provided on a lower surface of the cooling plate to support the high voltage apply electrode part from a lower side. Provided is a gas separation structure of separating a gas flow between an in-housing space and a discharge space by the cooling plate, the electrode holding member, and the high voltage apply electrode part.

IPC Classes  ?

• H01J 37/32 - Gas-filled discharge tubes

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

A housing in an active gas generator according to the present disclosure includes a peripheral stepped region formed along an outer periphery of a central bottom region, the peripheral stepped region being higher in formed height than the central bottom region. A high-voltage-electrode dielectric film on the peripheral stepped region forms a gas separation structure for separating a gas stream into a feeding space and an active gas generating space including a discharge space. A vacuum pump disposed outside the housing sets the feeding space under vacuum.

IPC Classes  ?

• H01J 37/32 - Gas-filled discharge tubes

Abstract

A capacitor unit includes: a base portion with a mount surface, and a locking member. The locking member includes a shaft portion to be inserted in a hole provided in the mount surface and a head portion. A first guide member and a second guide member guide along an anteroposterior direction, a first end and a second end of the base portion in a lateral direction, respectively. The hole is located between the capacitor and the first end in the lateral direction, and arranged at a position more distant from an opening than the first guide member in the anteroposterior direction. At a first engagement position, the locking member abuts on the first guide member. At a second engagement position, abutment of the locking member on the first guide member is canceled.

IPC Classes  ?

• H05K 7/14 - Mounting supporting structure in casing or on frame or rack
• H05K 7/20 - Modifications to facilitate cooling, ventilating, or heating
• H02M 7/00 - Conversion of ac power input into dc power output; Conversion of dc power input into ac power output

Abstract

Provided in an active gas generation apparatus according to the present disclosure is a gas separation structure of separating a gas flow between an in-housing space and a discharge space by a cooling plate, an electrode holding member, and a high voltage apply electrode part. The active gas generation apparatus further includes an auxiliary metal electrode provided on an upper surface of an electrode dielectric film in the high voltage apply electrode part. The auxiliary metal electrode is provided to overlap with part of an active gas transmission path in a plan view, and set to ground potential.

IPC Classes  ?

• H01J 37/32 - Gas-filled discharge tubes

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

When the tracking point reaches the i-th stand, the continuous rolling system outputs, to an i-th stand, a roll gap operation value for bringing to zero a difference between a value which is obtained by correcting a strip thickness target value of the i-th stand with a target strip thickness correction value of the i-th stand and a value which is obtained by correcting a strip thickness actual recalculation value of the i-th stand with a gap correction value of the i-th stand. Here, the gap correction value is a correction value that brings to zero a difference between a head end gap error when a head end of the material to be rolled reaches the i-th stand and a non-head end gap error when a part other than the head end of the material to be rolled reaches the i-th stand.

IPC Classes  ?

• 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

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