WO2011013187A1 - Self-excited reactive power compensation device - Google Patents

Self-excited reactive power compensation device Download PDF

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Publication number
WO2011013187A1
WO2011013187A1 PCT/JP2009/063325 JP2009063325W WO2011013187A1 WO 2011013187 A1 WO2011013187 A1 WO 2011013187A1 JP 2009063325 W JP2009063325 W JP 2009063325W WO 2011013187 A1 WO2011013187 A1 WO 2011013187A1
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Prior art keywords
self
voltage
excited
reactive power
control unit
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PCT/JP2009/063325
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French (fr)
Japanese (ja)
Inventor
泰久 堀田
眞男 船橋
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東芝三菱電機産業システム株式会社
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Application filed by 東芝三菱電機産業システム株式会社 filed Critical 東芝三菱電機産業システム株式会社
Priority to PCT/JP2009/063325 priority Critical patent/WO2011013187A1/en
Priority to JP2011524550A priority patent/JP5490801B2/en
Publication of WO2011013187A1 publication Critical patent/WO2011013187A1/en

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
    • H02J3/1821—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators
    • H02J3/1835—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators with stepless control
    • H02J3/1842—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators with stepless control wherein at least one reactive element is actively controlled by a bridge converter, e.g. active filters
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/34—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering
    • H02J7/345—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering using capacitors as storage or buffering devices
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
    • Y02E40/20—Active power filtering [APF]

Definitions

  • the present invention relates to a self-excited reactive power compensator, and more particularly to a self-excited reactive power compensator used in a power system.
  • Self-excited reactive power compensators such as STATCOM (Static Synchronous Compensator), SVG (Static Var Generator) or self-excited SVC (Static Var Compensator), are designed to improve system stability by controlling system reactive power. Often introduced.
  • the self-excited reactive power compensator is effective not only for improving the stability of the system during steady operation, but also for improving the transient stability of the system during and after a system fault.
  • control unit of the self-excited reactive power compensator is generally configured as follows. That is, the control unit outputs a reactive current command so that the system voltage follows the desired system voltage command (main loop), and power so that the output current of the power converter follows this reactive current command.
  • a current control loop (secondary loop) for controlling the output voltage of the converter.
  • Patent Document 1 discloses a semiconductor power conversion device that can control an output AC current at high speed following a set AC current.
  • This power converter includes a feedforward power control circuit that generates an output voltage command of a semiconductor power converter from the phase and amplitude of a set alternating current.
  • the output voltage command from the feedforward power control circuit is corrected based on the deviation between the set AC current and the system current. Further, the power converter is controlled based on the sum of the system voltage and the corrected output voltage command.
  • Non-patent Document 1 Hasegawa et al., “8MVA GTO-SVG Development Test”, IEEJ National Convention, 1989, 8-305-306 (Non-Patent Document 1)
  • a configuration is disclosed in which the stop of the inverter is released and the inverter is restarted after returning to step (1).
  • STATCOM includes a smoothing capacitor for smoothing an AC voltage, and a self-excited converter (inverter) that outputs reactive power to the power system using the voltage smoothed by the smoothing capacitor.
  • inverter self-excited converter
  • STATCOM stops switching of the switching element in the self-excited converter when the power system is interrupted and a stop command for stopping STATCOM is received from the host device, and then for maintenance of the device.
  • the circuit breaker provided between the STATCOM and the power system is opened, and the smoothing capacitor is discharged. Therefore, when the stop command is released and STATCOM is restarted, it is necessary to charge the smoothing capacitor first.
  • this charging usually takes 1 to 2 minutes, and after charging the smoothing capacitor, switching of the switching element in the self-excited converter is resumed. For this reason, it takes several minutes until the power system recovers from the power failure, the stop command from the host device is canceled, and STATCOM resumes operation.
  • This invention was made in order to solve the above-mentioned subject, and the purpose is to resume operation at an early stage when the stop command is canceled in a state where the operation is stopped in response to the stop command. It is to provide a possible self-excited reactive power compensator.
  • a self-excited reactive power compensator includes a capacitor for smoothing an alternating voltage, and a power that is coupled to a power system having a plurality of phases, includes a switching element, and is smoothed by the capacitor.
  • a self-excited converter for outputting reactive power to the power system, a first voltage detector for detecting the voltage of the power system, and a second for detecting the voltage across the capacitor.
  • the reactive power output from the self-excited converter to the power system is controlled by switching the switching element based on the generated current.
  • a control unit and a charger for charging the capacitor, and the control unit controls the charger so that a voltage detected by the second voltage detector is equal to or higher than a first predetermined value. The charging control is performed so as to charge the capacitor.
  • the operation when the operation is stopped in response to the stop command, the operation can be resumed early when the stop command is canceled.
  • FIG. 1 is a configuration diagram of a self-excited reactive power compensator according to a first embodiment of the present invention.
  • 1 is a circuit diagram of a self-excited converter 1.
  • FIG. It is a wave form diagram which shows operation
  • It is a figure which shows the stop sequence and restart sequence of the self-excited reactive power compensation apparatus which concern on the 1st Embodiment of this invention.
  • It is a wave form diagram which shows the operation
  • FIG. 1 is a configuration diagram of a self-excited reactive power compensator according to a first embodiment of the present invention.
  • self-excited reactive power compensator 101 includes self-excited converter 1, converter transformer 2, voltage detector 4, current detector 5, charger 51, and discharger 52. And a discharger 53, a voltage detector 9, a control unit 10, and a smoothing capacitor C.
  • the charger 51 includes a transformer 7, a rectifier 8, a resistor R1, and a switch SWA.
  • Discharger 52 includes a resistor R2 and a switch SWC.
  • Discharger 53 includes a resistor R3 and a switch SWB.
  • the charger 51 is provided to charge the capacitor C. More specifically, the transformer 7 transforms the AC voltage received from the AC power supply 6 via the switch SWA and the resistor R1 and outputs it to the rectifier 8.
  • the rectifier 8 is a diode rectifier, for example, and rectifies the AC voltage received from the transformer 7 and outputs it to the smoothing capacitor C.
  • the smoothing capacitor C smoothes the voltage rectified by the rectifier 8.
  • the voltage detector 9 detects the voltage across the capacitor C.
  • Self-excited converter 1 is coupled to power system 3 having u-phase, v-phase, and w-phase, includes a self-extinguishing type switching element, and is disabled to power system 3 based on the voltage smoothed by capacitor C Output power.
  • the converter transformer 2 transforms the voltage output from the self-excited converter 1 and outputs it to the power system 3.
  • the discharger 53 is provided for normal discharge of the smoothing capacitor C.
  • the discharger 52 is provided for rapid discharge of the smoothing capacitor C.
  • the discharger 53 has a discharge time constant larger than that of the discharger 52. That is, the resistance value of the resistor R2 in the discharger 52 is smaller than the resistance value of the resistor R3 in the discharger 53.
  • the switch SWB in the discharger 53 is, for example, a mechanical switch, and the switch SWC in the discharger 52 is, for example, a semiconductor switch.
  • the reliability of the self-excited reactive power compensator 101 can be improved by the configuration including the discharger 53 using a mechanical switch that is more reliable than the semiconductor switch, apart from the discharger 52.
  • the discharger 52 is provided to instantaneously reduce the voltage across the smoothing capacitor C to a predetermined level as will be described later. That is, since the discharger 52 only needs to discharge a part of the electric charge of the smoothing capacitor C by the configuration including the discharger 53 separately from the discharger 52, a resistor having a large rated capacity is used as the resistor R3 of the discharger 52. There is no need to use it, and the cost can be reduced.
  • FIG. 2 is a circuit diagram of the self-excited converter 1.
  • self-excited converter 1 includes switching elements Q1-Q6 and diodes D1-D6.
  • the switching elements Q1 to Q6 are, for example, GTO (Gate Turn Off thyristor), but are not limited to this as long as they are self-extinguishing type switching elements.
  • Diodes D1-D6 are connected in antiparallel to switching elements Q1-Q6, respectively.
  • a driving signal (gate pulse signal) is supplied from the control unit 10 to each of the switching elements Q1 to Q6.
  • the switching elements Q1 to Q6 perform a switching operation in accordance with the drive signal, convert the voltage smoothed by the smoothing capacitor C, that is, a DC voltage into an AC voltage, and supply it to the power system 3.
  • the voltage detector 4 detects the voltage (system voltage) of the power system 3.
  • the voltage detected by the voltage detector 4 is given to the control unit 10 as a feedback voltage.
  • the current detector 5 detects the output current of the self-excited converter 1, that is, the current flowing between the power system 3 and the self-excited converter 1.
  • the current detected by the current detector 5 is given to the control unit 10 as a feedback current.
  • the control unit 10 includes an amplitude detection unit 11, a reactive current detection unit 12, a voltage command generation unit 13, subtracters 14 and 16, a voltage control unit 15, a reactive current control unit 17, and a gate pulse generation unit 21. Including.
  • the control unit 10 controls the switching element based on the voltage detected by the voltage detector 4 and the current detected by the current detector 5, thereby reactive power output from the self-excited converter 1 to the power system 3. To control.
  • the amplitude detector 11 detects the amplitude value Vs by calculating the amplitude value Vs of the system voltage detected by the voltage detector 4, and subtracts the calculated (detected) amplitude value Vs.
  • the electric power system 3 includes a u phase, a v phase, and a w phase.
  • the amplitude detector 11 calculates an amplitude value Vs based on the following equation.
  • Vs (Vu 2 + Vv 2 + Vw 2 ) 1/2
  • the voltage command generator 13 generates and outputs a voltage command Vref indicating the reference value of the amplitude value Vs.
  • the reference value of the amplitude value Vs indicated by the voltage command Vref is constant.
  • the subtractor 14 calculates the deviation ⁇ V by subtracting the amplitude value Vs from the voltage command Vref, and gives the deviation ⁇ V to the voltage control unit 15.
  • the voltage control unit 15 is configured as an arithmetic unit that performs PI (Proportional Integral) control.
  • the voltage control unit 15 calculates a current reference Iref for reducing the input deviation ⁇ V, and outputs the current reference Iref.
  • the current reference Iref corresponds to the reference value of the reactive current Iq output from the self-excited converter 1.
  • the reactive current detector 12 detects the reactive current Iq output from the self-excited converter 1 based on the output current of the self-excited converter 1 detected by the current detector 5. Specifically, the reactive current detector 12 detects the reactive current Iq by performing three-phase / two-phase conversion on the u-phase current, the v-phase current, and the w-phase current detected by the current detector 5.
  • the subtractor 16 calculates the deviation ⁇ I by subtracting the reactive current Iq from the current reference Iref, and gives the deviation ⁇ I to the reactive current control unit 17.
  • the reactive current control unit 17 is configured as an arithmetic unit that performs PI control.
  • the reactive current control unit 17 calculates a voltage reference Vi for reducing the input deviation ⁇ I, and gives the voltage reference Vi to the gate pulse generation unit 21.
  • the gate pulse generator 21 generates switching signals Q1 to Q6 in the self-excited converter 1, for example, according to PWM (Pulse Width Modulation) control, for the self-excited converter 1 to output a voltage corresponding to the voltage reference Vi. To supply.
  • PWM Pulse Width Modulation
  • the voltage reference Vi is obtained as an output of a control system obtained by adding a current minor loop control using the reactive current control unit 17 as a controller to a voltage feedback control system using the voltage control unit 15 as a controller. With this control system, the voltage reference Vi can be changed following the change in the system voltage.
  • FIG. 3 is a waveform diagram showing the operation of the self-excited reactive power compensator according to the first embodiment of the present invention.
  • VC is a voltage across the smoothing capacitor C.
  • FIG. 4 is a diagram showing a stop sequence and a restart sequence of the self-excited reactive power compensator according to the first embodiment of the present invention.
  • control unit 10 in self-excited reactive power compensator 101 turns off switch SWA and turns on switch SWB at time t0, that is, before the start command is received from the host device.
  • Switch SWC is turned off.
  • the smoothing capacitor C is reliably discharged by the discharger 53, and the maintainability of the apparatus can be improved.
  • the control unit 10 receives a start command from the host device, turns on the switch SWA, and turns off the switch SWB.
  • the smoothing capacitor C is charged by the charger 51, that is, the voltage VC across the smoothing capacitor C is increased by the AC voltage supplied from the AC power supply 6.
  • control unit 10 When the voltage VC reaches a predetermined value V2 larger than the predetermined value V1 at time t2, the control unit 10 turns off the switch SWA. Thereby, the charging of the smoothing capacitor C by the charger 51 is stopped. Then, control unit 10 outputs a drive signal to switching elements Q1 to Q6, and restarts switching of switching elements Q1 to Q6. Even after the switch SWA is turned off, the capacitor C is charged by the switching of the switching elements Q1 to Q6, so that the voltage VC is maintained at a predetermined value V2 or more.
  • step S1 the power system 3 is blacked out, and a stop command is output from the host device to the self-excited reactive power compensator 101 (step S1).
  • the voltage VC greatly increases due to the power from the power system 3.
  • the control unit 10 receives this stop command from the host device and stops the output of the drive signals to the switching elements Q1 to Q6, thereby stopping the switching of the switching elements Q1 to Q6, that is, the self-excited converter 1 Stop. Thereby, the output of the reactive power from the self-excited reactive power compensator 101 to the power system 3 is stopped (step S2).
  • the control unit 10 turns off the switch SWC. Thereby, the rapid discharge of the smoothing capacitor C by the discharger 52 is stopped. Even after the switch SWC is turned off, the voltage VC decreases.
  • the control unit 10 turns on the switch SWA until the voltage VC reaches the predetermined value V2. As a result, the smoothing capacitor C is charged by the charger 51.
  • the power system 3 recovers from the power failure and the stop command from the host device is released (step S3).
  • the control unit 10 releases the stop of the self-excited converter 1, that is, outputs a drive signal to the switching elements Q1 to Q6, and resumes switching of the switching elements Q1 to Q6. (Step S4). Thereby, the output of the reactive power from the self-excited reactive power compensator 101 to the power system 3 is resumed (step S5).
  • the control unit 10 controls the charger 51 so that the voltage across the capacitor C becomes equal to or higher than the predetermined value V1.
  • charging control for charging the capacitor C is performed. More specifically, the control unit 10 performs charge control when the voltage detected by the voltage detector 9 is less than the predetermined value V1, and the voltage detected by the voltage detector 9 is greater than the predetermined value V1 and higher than the predetermined value V3.
  • the charging control is stopped.
  • the self-excited reactive power compensator in the state where the operation is stopped in response to the stop command, the operation can be resumed early when the stop command is canceled. it can.
  • the self-excited reactive power compensator according to the first embodiment of the present invention includes a discharger 52 for discharging the capacitor C. Then, when the voltage detected by the voltage detector 9 becomes equal to or higher than a predetermined value V3 larger than the predetermined value V1, the control unit 10 controls the discharger 52 to discharge the capacitor C.
  • the control unit 10 turns on the switch SWA and starts the charging operation of the charger 51 when the voltage VC becomes less than the predetermined value V1.
  • the switch SWA may be turned on immediately after receiving a stop command from the host device, and the charging operation of the charger 51 may be started.
  • the present embodiment relates to a self-excited reactive power compensator in which the stop sequence and the restart sequence are changed as compared with the self-excited reactive power compensator according to the first embodiment.
  • the contents other than those described below are the same as those of the self-excited reactive power compensator according to the first embodiment.
  • FIG. 5 is a configuration diagram of a self-excited reactive power compensator according to the second embodiment of the present invention.
  • self-excited reactive power compensator 102 is further provided with a circuit breaker CB and not a discharger 52 as compared with the self-excited reactive power compensator according to the first embodiment of the present invention.
  • the circuit breaker CB is provided to interrupt the electrical connection between the power system 3 and the self-excited converter 1.
  • FIG. 6 is a waveform diagram showing the operation of the self-excited reactive power compensator according to the second embodiment of the present invention.
  • VC is the voltage across the smoothing capacitor C.
  • FIG. 7 is a diagram illustrating a stop sequence and a restart sequence of the self-excited reactive power compensator according to the second embodiment of the present invention.
  • control unit 10 in self-excited reactive power compensator 102 turns off switch SWA and turns on switch SWB at time t0, that is, before the start command is received from the host device. Open the circuit breaker CB.
  • the smoothing capacitor C is reliably discharged by the discharger 53, and the maintainability of the apparatus can be improved. Further, by opening the circuit breaker CB, it is possible to prevent the smoothing capacitor C from being charged by the power from the power system 3.
  • the control unit 10 receives a start command from the host device, turns on the switch SWA, turns off the switch SWB, and turns on the circuit breaker CB. Thereby, the electric power system 3 and the self-excited converter 1 are electrically connected. Further, the smoothing capacitor C is charged by the charger 51, that is, the voltage VC across the smoothing capacitor C is increased by the AC voltage supplied from the AC power supply 6.
  • control unit 10 When the voltage VC reaches a predetermined value V2 larger than the predetermined value V1 at time t2, the control unit 10 turns off the switch SWA. Thereby, the charging of the smoothing capacitor C by the charger 51 is stopped. Then, control unit 10 outputs a drive signal to switching elements Q1 to Q6, and restarts switching of switching elements Q1 to Q6. Even after the switch SWA is turned off, the capacitor C is charged by the switching of the switching elements Q1 to Q6, so that the voltage VC is maintained at a predetermined value V2 or more.
  • step S11 the power system 3 is blacked out, and a stop command is output from the host device to the self-excited reactive power compensator 102 (step S11).
  • the voltage VC greatly decreases.
  • the control unit 10 receives this stop command from the host device and stops the output of the drive signals to the switching elements Q1 to Q6, thereby stopping the switching of the switching elements Q1 to Q6, that is, the self-excited converter 1 Stop. Thereby, the output of the reactive power from the self-excited reactive power compensator 102 to the power system 3 is stopped (step S12).
  • step S13 the control part 10 interrupts
  • the control unit 10 turns on the switch SWA. As a result, the smoothing capacitor C is charged by the charger 51.
  • the control unit 10 turns off the switch SWA. Thereby, the charging of the smoothing capacitor C by the charger 51 is stopped.
  • the power system 3 returns from the power failure and the stop command from the host device is released (step S14).
  • the control unit 10 releases the stop of the self-excited converter 1, that is, outputs a drive signal to the switching elements Q1 to Q6, and resumes switching of the switching elements Q1 to Q6. (Step S15).
  • control part 10 electrically connects the electric power grid
  • step S17 The output of the reactive power from the self-excited reactive power compensator 102 to the power system 3 is restarted through steps S15 and S16 (step S17).
  • control unit 10 receives the stop command for stopping the self-excited reactive power compensator 102 and switches the switching elements Q1 ⁇ The switching of Q6 is stopped, and the circuit breaker CB is controlled to cut off the electrical connection between the power system 3 and the self-excited converter 1. Then, when the stop command is released, control unit 10 resumes switching of switching elements Q1 to Q6, and controls breaker CB to electrically connect power system 3 and self-excited converter 1.
  • the self-excited reactive power compensator in the state where the operation is stopped in response to the stop command, the operation is resumed as soon as the stop command is released. can do.
  • the smoothing capacitor C can be prevented from being overcharged by the electric power from the power system 3 until the stop command is canceled after the stop command is received, the self-according to the first embodiment. Compared with the excited reactive power compensator, the discharger 52 becomes unnecessary.
  • 1 self-excited converter 2 transformer, 4 voltage detector, 5 current detector, 7 transformer, 8 rectifier, 9 voltage detector, 10 control unit, 11 amplitude detection unit, 12 reactive current detection unit, 13 Voltage command generator, 14, 16 subtractor, 15 voltage controller, 17 reactive current controller, 21 gate pulse generator, 51 charger, 52 discharger, 53 discharger, 101, 102 self-excited reactive power compensator, C smoothing capacitor, R1, R2, R3 resistance, SWA, SWB, SWC switch, Q1-Q6 switching element, D1-D6 diode, CB breaker.

Abstract

A self-excited reactive power compensation device is provided with a capacitor (C) for smoothing alternating-current voltage, a self-excited converter (1) that is coupled to a power system (3) having multiple phases and includes a switching element in order to output reactive power to the power system (3) on the basis of electric power smoothed by the capacitor (C), and a control unit (10) for controlling the reactive power outputted from the self-excited converter (1) to the power system (3) by switching the switching element on the basis of the voltage of the power system (3) detected by a first voltage detector (4) and an electric current flowing between the power system (3) and the self-excited converter (1), which is detected by a current detector (5).  The control unit (10) controls a charger (51) to thereby perform charge control for charging the capacitor (C) in such a manner that the voltage between both ends of the capacitor (C) detected by a second voltage detector (9) is a first predetermined value or more.

Description

自励式無効電力補償装置Self-excited reactive power compensator
　本発明は、自励式無効電力補償装置に関し、特に、電力系統に用いられる自励式無効電力補償装置に関する。 The present invention relates to a self-excited reactive power compensator, and more particularly to a self-excited reactive power compensator used in a power system.
　ＳＴＡＴＣＯＭ(Static　Synchronous　Compensator）、ＳＶＧ（Static　Var　Generator）あるいは自励式ＳＶＣ（Static　Var　Compensator）などと呼ばれる自励式無効電力補償装置は、系統無効電力を制御することによって系統の安定度を向上させるために導入されることが多い。自励式無効電力補償装置は、定常運転時の系統の安定度を向上させる場合のみならず、系統事故中および事故除去後といった系統の過渡的な安定度の向上にも有効である。 Self-excited reactive power compensators, such as STATCOM (Static Synchronous Compensator), SVG (Static Var Generator) or self-excited SVC (Static Var Compensator), are designed to improve system stability by controlling system reactive power. Often introduced. The self-excited reactive power compensator is effective not only for improving the stability of the system during steady operation, but also for improving the transient stability of the system during and after a system fault.
　上記目的を達成するため、自励式無効電力補償装置の制御部は一般に以下のように構成されている。すなわち制御部は、系統電圧が所望の系統電圧指令に追従するように無効電流指令を出力する電圧制御ループ（主ループ）と、電力変換器の出力電流がこの無効電流指令に追従するように電力変換器の出力電圧を制御する電流制御ループ（従ループ）とを有している。 In order to achieve the above object, the control unit of the self-excited reactive power compensator is generally configured as follows. That is, the control unit outputs a reactive current command so that the system voltage follows the desired system voltage command (main loop), and power so that the output current of the power converter follows this reactive current command. A current control loop (secondary loop) for controlling the output voltage of the converter.
　たとえば特開平６－２３３５４４号公報（特許文献１）は、設定交流電流に追従して出力交流電流を高速に制御可能な半導体電力変換装置を開示する。この電力変換装置は、設定交流電流の位相と振幅とから半導体電力変換器の出力電圧指令を生成するフィードフォワード電力制御回路を備える。フィードフォワード電力制御回路からの出力電圧指令は、設定交流電流と系統電流との偏差に基づいて補正される。さらに系統電圧と補正された出力電圧指令との和に基づいて、電力変換器が制御される。 For example, Japanese Patent Laid-Open No. 6-233544 (Patent Document 1) discloses a semiconductor power conversion device that can control an output AC current at high speed following a set AC current. This power converter includes a feedforward power control circuit that generates an output voltage command of a semiconductor power converter from the phase and amplitude of a set alternating current. The output voltage command from the feedforward power control circuit is corrected based on the deviation between the set AC current and the system current. Further, the power converter is controlled based on the sum of the system voltage and the corrected output voltage command.
　また、長谷川　他、「８ＭＶＡ　ＧＴＯ－ＳＶＧの開発試験」、電気学会全国大会、平成元年、８－３０５～３０６（非特許文献１）および長谷川　他、「系統安定化用１００ＭＶＡ級ＧＴＯ－ＳＶＧの検討」、電気学会全国大会、平成元年、８－３０７（非特許文献２）には、自励式無効電力補償装置において、事故発生を検出すると連系状態のままインバータを停止し、電圧が正常に復帰した後にインバータの停止を解除し、再起動する構成が開示されている。 Also, Hasegawa et al., “8MVA GTO-SVG Development Test”, IEEJ National Convention, 1989, 8-305-306 (Non-Patent Document 1), Hasegawa et al., “100MVA class GTO-SVG for system stabilization Study ”, IEEJ National Convention, 1989, 8-307 (Non-patent Document 2), in the self-excited reactive power compensator, when the occurrence of an accident was detected, the inverter was stopped and the voltage was normal. A configuration is disclosed in which the stop of the inverter is released and the inverter is restarted after returning to step (1).
特開平６－２３３５４４号公報JP-A-6-233544
　通常、ＳＴＡＴＣＯＭは、交流電圧を平滑化するための平滑用コンデンサと、この平滑用コンデンサによって平滑化された電圧を用いて電力系統へ無効電力を出力する自励式変換器（インバータ）とを備える。ＳＴＡＴＣＯＭを運転する際には、平滑用コンデンサを充電しておく必要がある。 Usually, STATCOM includes a smoothing capacitor for smoothing an AC voltage, and a self-excited converter (inverter) that outputs reactive power to the power system using the voltage smoothed by the smoothing capacitor. When operating STATCOM, it is necessary to charge the smoothing capacitor.
　従来のＳＴＡＴＣＯＭでは、電力系統において瞬時的に電圧が低下した場合、自励式変換器におけるスイッチング素子のスイッチングを停止する一方で、平滑用コンデンサの放電は行なわない。そして、電力系統の電圧が復帰した後すぐに再運転する、すなわち自励式変換器におけるスイッチング素子のスイッチングを再開する。 In the conventional STATCOM, when the voltage instantaneously drops in the power system, the switching of the switching element in the self-excited converter is stopped while the smoothing capacitor is not discharged. And it restarts immediately after the voltage of an electric power grid | system returns, ie, switching of the switching element in a self-excited converter is restarted.
　一方、数秒間の電圧低下が検出されて電力系統が完全に停電してしまった場合には、ＳＴＡＴＣＯＭは、重故障であるとして緊急停止する。より詳細には、ＳＴＡＴＣＯＭは、電力系統が停電し、ＳＴＡＴＣＯＭを停止させるための停止指令を上位装置から受けると、自励式変換器におけるスイッチング素子のスイッチングを停止し、その後、装置のメンテナンスのために、ＳＴＡＴＣＯＭと電力系統との間に設けられた遮断器を開放し、平滑用コンデンサを放電する。このため、停止指令が解除されてＳＴＡＴＣＯＭを再起動するときには、まず平滑用コンデンサを充電する必要がある。しかしながら、この充電には通常１～２分を要し、平滑用コンデンサを充電した後、自励式変換器におけるスイッチング素子のスイッチングが再開される。このため、電力系統が停電から復帰し、上位装置からの停止指令が解除されてＳＴＡＴＣＯＭが運転を再開するまでに数分の時間を費やしてしまう。 On the other hand, if a voltage drop for a few seconds is detected and the power system has completely failed, STATCOM will urgently stop as a serious failure. More specifically, STATCOM stops switching of the switching element in the self-excited converter when the power system is interrupted and a stop command for stopping STATCOM is received from the host device, and then for maintenance of the device. The circuit breaker provided between the STATCOM and the power system is opened, and the smoothing capacitor is discharged. Therefore, when the stop command is released and STATCOM is restarted, it is necessary to charge the smoothing capacitor first. However, this charging usually takes 1 to 2 minutes, and after charging the smoothing capacitor, switching of the switching element in the self-excited converter is resumed. For this reason, it takes several minutes until the power system recovers from the power failure, the stop command from the host device is canceled, and STATCOM resumes operation.
　この発明は、上述の課題を解決するためになされたもので、その目的は、停止指令を受けて運転を停止している状態において、停止指令が解除されると早期に運転を再開することが可能な自励式無効電力補償装置を提供することである。 This invention was made in order to solve the above-mentioned subject, and the purpose is to resume operation at an early stage when the stop command is canceled in a state where the operation is stopped in response to the stop command. It is to provide a possible self-excited reactive power compensator.
　この発明のある局面に係わる自励式無効電力補償装置は、交流電圧を平滑化するためのコンデンサと、複数の相を有する電力系統に結合され、スイッチング素子を含み、上記コンデンサによって平滑化された電力に基づいて上記電力系統へ無効電力を出力するための自励式変換器と、上記電力系統の電圧を検出するための第１の電圧検出器と、上記コンデンサの両端電圧を検出するための第２の電圧検出器と、上記電力系統と上記自励式変換器との間に流れる電流を検出するための電流検出器と、上記第１の電圧検出器によって検出された電圧および上記電流検出器によって検出された電流に基づいて上記スイッチング素子をスイッチングさせることにより、上記自励式変換器から上記電力系統へ出力される上記無効電力を制御するための制御部と、上記コンデンサを充電するための充電器とを備え、上記制御部は、上記充電器を制御することにより、上記第２の電圧検出器によって検出される電圧が第１の所定値以上になるように上記コンデンサを充電する充電制御を行なう。 A self-excited reactive power compensator according to an aspect of the present invention includes a capacitor for smoothing an alternating voltage, and a power that is coupled to a power system having a plurality of phases, includes a switching element, and is smoothed by the capacitor. A self-excited converter for outputting reactive power to the power system, a first voltage detector for detecting the voltage of the power system, and a second for detecting the voltage across the capacitor. A voltage detector, a current detector for detecting a current flowing between the power system and the self-excited converter, a voltage detected by the first voltage detector, and a detection by the current detector The reactive power output from the self-excited converter to the power system is controlled by switching the switching element based on the generated current. A control unit and a charger for charging the capacitor, and the control unit controls the charger so that a voltage detected by the second voltage detector is equal to or higher than a first predetermined value. The charging control is performed so as to charge the capacitor.
　本発明によれば、停止指令を受けて運転を停止している状態において、停止指令が解除されると早期に運転を再開することができる。 According to the present invention, when the operation is stopped in response to the stop command, the operation can be resumed early when the stop command is canceled.
本発明の第１の実施の形態に係る自励式無効電力補償装置の構成図である。1 is a configuration diagram of a self-excited reactive power compensator according to a first embodiment of the present invention. 自励式変換器１の回路図である。1 is a circuit diagram of a self-excited converter 1. FIG. 本発明の第１の実施の形態に係る自励式無効電力補償装置の動作を示す波形図である。It is a wave form diagram which shows operation | movement of the self-excitation reactive power compensator which concerns on the 1st Embodiment of this invention. 本発明の第１の実施の形態に係る自励式無効電力補償装置の停止シーケンスおよび再起動シーケンスを示す図である。It is a figure which shows the stop sequence and restart sequence of the self-excited reactive power compensation apparatus which concern on the 1st Embodiment of this invention. 本発明の第２の実施の形態に係る自励式無効電力補償装置の構成図である。It is a block diagram of the self-excitation reactive power compensation apparatus which concerns on the 2nd Embodiment of this invention. 本発明の第２の実施の形態に係る自励式無効電力補償装置の動作を示す波形図である。It is a wave form diagram which shows the operation | movement of the self-excitation reactive power compensator which concerns on the 2nd Embodiment of this invention. 本発明の第２の実施の形態に係る自励式無効電力補償装置の停止シーケンスおよび再起動シーケンスを示す図である。It is a figure which shows the stop sequence and restart sequence of the self-excitation reactive power compensator which concern on the 2nd Embodiment of this invention.
　以下、本発明の実施の形態について図面を用いて説明する。なお、図中同一または相当部分には同一符号を付してその説明は繰り返さない。 Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the drawings, the same or corresponding parts are denoted by the same reference numerals and description thereof will not be repeated.
　＜第１の実施の形態＞
　［構成および基本動作］
　図１は、本発明の第１の実施の形態に係る自励式無効電力補償装置の構成図である。 <First Embodiment>
[Configuration and basic operation]
FIG. 1 is a configuration diagram of a self-excited reactive power compensator according to a first embodiment of the present invention.
　図１を参照して、自励式無効電力補償装置１０１は、自励式変換器１と、変換器用変圧器２と、電圧検出器４と、電流検出器５と、充電器５１と、放電器５２と、放電器５３と、電圧検出器９と、制御部１０と、平滑用コンデンサＣとを備える。充電器５１は、変圧器７と、整流器８と、抵抗Ｒ１と、スイッチＳＷＡとを含む。放電器５２は、抵抗Ｒ２と、スイッチＳＷＣとを含む。放電器５３は、抵抗Ｒ３と、スイッチＳＷＢとを含む。 Referring to FIG. 1, self-excited reactive power compensator 101 includes self-excited converter 1, converter transformer 2, voltage detector 4, current detector 5, charger 51, and discharger 52. And a discharger 53, a voltage detector 9, a control unit 10, and a smoothing capacitor C. The charger 51 includes a transformer 7, a rectifier 8, a resistor R1, and a switch SWA. Discharger 52 includes a resistor R2 and a switch SWC. Discharger 53 includes a resistor R3 and a switch SWB.
　充電器５１は、コンデンサＣを充電するために設けられている。より詳細には、変圧器７は、スイッチＳＷＡおよび抵抗Ｒ１を介して交流電源６から受けた交流電圧を変圧し、整流器８へ出力する。 The charger 51 is provided to charge the capacitor C. More specifically, the transformer 7 transforms the AC voltage received from the AC power supply 6 via the switch SWA and the resistor R1 and outputs it to the rectifier 8.
　整流器８は、たとえばダイオード整流器であり、変圧器７から受けた交流電圧を整流して平滑用コンデンサＣへ出力する。 The rectifier 8 is a diode rectifier, for example, and rectifies the AC voltage received from the transformer 7 and outputs it to the smoothing capacitor C.
　平滑用コンデンサＣは、整流器８によって整流された電圧を平滑化する。電圧検出器９は、コンデンサＣの両端電圧を検出する。 The smoothing capacitor C smoothes the voltage rectified by the rectifier 8. The voltage detector 9 detects the voltage across the capacitor C.
　自励式変換器１は、ｕ相、ｖ相、ｗ相を有する電力系統３に結合され、自己消弧型のスイッチング素子を含み、コンデンサＣによって平滑化された電圧に基づいて電力系統３へ無効電力を出力する。変換器用変圧器２は、自励式変換器１から出力された電圧を変圧して電力系統３へ出力する。 Self-excited converter 1 is coupled to power system 3 having u-phase, v-phase, and w-phase, includes a self-extinguishing type switching element, and is disabled to power system 3 based on the voltage smoothed by capacitor C Output power. The converter transformer 2 transforms the voltage output from the self-excited converter 1 and outputs it to the power system 3.
　放電器５３は、平滑用コンデンサＣの通常放電を行なうために設けられている。放電器５２は、平滑用コンデンサＣの急速放電を行なうために設けられている。放電器５３は、放電器５２より大きい放電時定数を有する。すなわち、放電器５２における抵抗Ｒ２の抵抗値は放電器５３における抵抗Ｒ３の抵抗値よりも小さい。また、放電器５３におけるスイッチＳＷＢはたとえば機械スイッチであり、放電器５２におけるスイッチＳＷＣはたとえば半導体スイッチである。 The discharger 53 is provided for normal discharge of the smoothing capacitor C. The discharger 52 is provided for rapid discharge of the smoothing capacitor C. The discharger 53 has a discharge time constant larger than that of the discharger 52. That is, the resistance value of the resistor R2 in the discharger 52 is smaller than the resistance value of the resistor R3 in the discharger 53. Further, the switch SWB in the discharger 53 is, for example, a mechanical switch, and the switch SWC in the discharger 52 is, for example, a semiconductor switch.
　放電器５２とは別に、半導体スイッチと比べて信頼性の高い機械スイッチを用いた放電器５３を備える構成により、自励式無効電力補償装置１０１の信頼性を向上させることができる。また、放電器５２は、後述するように平滑用コンデンサＣの両端電圧を所定レベルまで瞬時に低下させるために設けられている。すなわち、放電器５２とは別に放電器５３を備える構成により、放電器５２は、平滑用コンデンサＣの電荷の一部を放電すればよくなるため、放電器５２の抵抗Ｒ３として定格容量の大きい抵抗を使用する必要がなくなり、コストを低減することができる。 The reliability of the self-excited reactive power compensator 101 can be improved by the configuration including the discharger 53 using a mechanical switch that is more reliable than the semiconductor switch, apart from the discharger 52. The discharger 52 is provided to instantaneously reduce the voltage across the smoothing capacitor C to a predetermined level as will be described later. That is, since the discharger 52 only needs to discharge a part of the electric charge of the smoothing capacitor C by the configuration including the discharger 53 separately from the discharger 52, a resistor having a large rated capacity is used as the resistor R3 of the discharger 52. There is no need to use it, and the cost can be reduced.
　図２は、自励式変換器１の回路図である。
　図２を参照して、自励式変換器１は、スイッチング素子Ｑ１～Ｑ６と、ダイオードＤ１～Ｄ６とを含む。スイッチング素子Ｑ１～Ｑ６はたとえばＧＴＯ（Gate　Turn　Off　thyristor)であるが、自己消弧型のスイッチング素子であればこれに限定されるものではない。ダイオードＤ１～Ｄ６はスイッチング素子Ｑ１～Ｑ６にそれぞれ逆並列接続される。スイッチング素子Ｑ１～Ｑ６の各々には制御部１０から駆動信号（ゲートパルス信号）が供給される。スイッチング素子Ｑ１～Ｑ６は駆動信号に応じてスイッチング動作を行ない、平滑用コンデンサＣによって平滑化された電圧すなわち直流電圧を交流電圧に変換して電力系統３に供給する。 FIG. 2 is a circuit diagram of the self-excited converter 1.
Referring to FIG. 2, self-excited converter 1 includes switching elements Q1-Q6 and diodes D1-D6. The switching elements Q1 to Q6 are, for example, GTO (Gate Turn Off thyristor), but are not limited to this as long as they are self-extinguishing type switching elements. Diodes D1-D6 are connected in antiparallel to switching elements Q1-Q6, respectively. A driving signal (gate pulse signal) is supplied from the control unit 10 to each of the switching elements Q1 to Q6. The switching elements Q1 to Q6 perform a switching operation in accordance with the drive signal, convert the voltage smoothed by the smoothing capacitor C, that is, a DC voltage into an AC voltage, and supply it to the power system 3.
　再び図１を参照して、電圧検出器４は、電力系統３の電圧（系統電圧）を検出する。電圧検出器４によって検出された電圧はフィードバック電圧として制御部１０に与えられる。電流検出器５は、自励式変換器１の出力電流すなわち電力系統３と自励式変換器１との間に流れる電流を検出する。電流検出器５によって検出された電流は、フィードバック電流として制御部１０に与えられる。 Referring to FIG. 1 again, the voltage detector 4 detects the voltage (system voltage) of the power system 3. The voltage detected by the voltage detector 4 is given to the control unit 10 as a feedback voltage. The current detector 5 detects the output current of the self-excited converter 1, that is, the current flowing between the power system 3 and the self-excited converter 1. The current detected by the current detector 5 is given to the control unit 10 as a feedback current.
　次に、制御部１０の構成について説明する。制御部１０は、振幅検出部１１と、無効電流検出部１２と、電圧指令生成部１３と、減算器１４，１６と、電圧制御部１５と、無効電流制御部１７と、ゲートパルス発生部２１とを含む。 Next, the configuration of the control unit 10 will be described. The control unit 10 includes an amplitude detection unit 11, a reactive current detection unit 12, a voltage command generation unit 13, subtracters 14 and 16, a voltage control unit 15, a reactive current control unit 17, and a gate pulse generation unit 21. Including.
　制御部１０は、電圧検出器４によって検出された電圧および電流検出器５によって検出された電流に基づいてスイッチング素子を制御することにより、自励式変換器１から電力系統３へ出力される無効電力を制御する。 The control unit 10 controls the switching element based on the voltage detected by the voltage detector 4 and the current detected by the current detector 5, thereby reactive power output from the self-excited converter 1 to the power system 3. To control.
　より詳細には、振幅検出部１１は、電圧検出器４によって検出された系統電圧の振幅値Ｖｓを算出することによって振幅値Ｖｓを検出し、その算出した（検出した）振幅値Ｖｓを減算器１４に与える。電力系統３はｕ相、ｖ相、ｗ相からなる。ｕ相、ｖ相、ｗ相の電圧をそれぞれＶｕ，Ｖｖ，Ｖｗとすると、振幅検出部１１は以下の式に基づいて振幅値Ｖｓを算出する。 More specifically, the amplitude detector 11 detects the amplitude value Vs by calculating the amplitude value Vs of the system voltage detected by the voltage detector 4, and subtracts the calculated (detected) amplitude value Vs. 14 The electric power system 3 includes a u phase, a v phase, and a w phase. When the u-phase, v-phase, and w-phase voltages are Vu, Vv, and Vw, respectively, the amplitude detector 11 calculates an amplitude value Vs based on the following equation.
　Ｖｓ＝（Ｖｕ2＋Ｖｖ2＋Ｖｗ2）1/2
　電圧指令生成部１３は、振幅値Ｖｓの基準値を示す電圧指令Ｖｒｅｆを生成して出力する。電圧指令Ｖｒｅｆが示す振幅値Ｖｓの基準値は一定である。 Vs = (Vu 2 + Vv 2 + Vw 2 ) 1/2
The voltage command generator 13 generates and outputs a voltage command Vref indicating the reference value of the amplitude value Vs. The reference value of the amplitude value Vs indicated by the voltage command Vref is constant.
　減算器１４は、電圧指令Ｖｒｅｆから振幅値Ｖｓを減算することにより偏差ΔＶを算出して、その偏差ΔＶを電圧制御部１５に与える。 The subtractor 14 calculates the deviation ΔV by subtracting the amplitude value Vs from the voltage command Vref, and gives the deviation ΔV to the voltage control unit 15.
　電圧制御部１５はＰＩ（Proportional　Integral）制御を行なう演算器として構成される。電圧制御部１５は、入力された偏差ΔＶを小さくするための電流基準Ｉｒｅｆを演算して、その電流基準Ｉｒｅｆを出力する。電流基準Ｉｒｅｆは、自励式変換器１から出力される無効電流Ｉｑの基準値に対応する。 The voltage control unit 15 is configured as an arithmetic unit that performs PI (Proportional Integral) control. The voltage control unit 15 calculates a current reference Iref for reducing the input deviation ΔV, and outputs the current reference Iref. The current reference Iref corresponds to the reference value of the reactive current Iq output from the self-excited converter 1.
　無効電流検出部１２は、電流検出器５によって検出された自励式変換器１の出力電流に基づいて、自励式変換器１から出力される無効電流Ｉｑを検出する。具体的には、無効電流検出部１２は、電流検出器５により検出されたｕ相電流、ｖ相電流およびｗ相電流を３相／２相変換することによって無効電流Ｉｑを検出する。 The reactive current detector 12 detects the reactive current Iq output from the self-excited converter 1 based on the output current of the self-excited converter 1 detected by the current detector 5. Specifically, the reactive current detector 12 detects the reactive current Iq by performing three-phase / two-phase conversion on the u-phase current, the v-phase current, and the w-phase current detected by the current detector 5.
　減算器１６は電流基準Ｉｒｅｆから無効電流Ｉｑを減算することにより偏差ΔＩを算出して、その偏差ΔＩを無効電流制御部１７に与える。無効電流制御部１７は、ＰＩ制御を行なう演算器として構成される。無効電流制御部１７は入力された偏差ΔＩを小さくするための電圧基準Ｖｉを演算して、その電圧基準Ｖｉをゲートパルス発生部２１に与える。 The subtractor 16 calculates the deviation ΔI by subtracting the reactive current Iq from the current reference Iref, and gives the deviation ΔI to the reactive current control unit 17. The reactive current control unit 17 is configured as an arithmetic unit that performs PI control. The reactive current control unit 17 calculates a voltage reference Vi for reducing the input deviation ΔI, and gives the voltage reference Vi to the gate pulse generation unit 21.
　ゲートパルス発生部２１は、たとえばＰＷＭ（Pulse　Width　Modulation）制御に従って、自励式変換器１が電圧基準Ｖｉに相当する電圧を出力するためのゲートパルス信号を自励式変換器１におけるスイッチング素子Ｑ１～Ｑ６に供給する。 The gate pulse generator 21 generates switching signals Q1 to Q6 in the self-excited converter 1, for example, according to PWM (Pulse Width Modulation) control, for the self-excited converter 1 to output a voltage corresponding to the voltage reference Vi. To supply.
　電圧基準Ｖｉは、電圧制御部１５を制御器とする電圧フィードバック制御系に無効電流制御部１７を制御器とする電流マイナーループ制御を加えた制御系の出力として得られる。この制御系により、電圧基準Ｖｉを系統電圧の変化に追従して変化させることができる。 The voltage reference Vi is obtained as an output of a control system obtained by adding a current minor loop control using the reactive current control unit 17 as a controller to a voltage feedback control system using the voltage control unit 15 as a controller. With this control system, the voltage reference Vi can be changed following the change in the system voltage.
　［動作］
　次に、本発明の第１の実施の形態に係る自励式無効電力補償装置の動作について説明する。 [Operation]
Next, the operation of the self-excited reactive power compensator according to the first embodiment of the present invention will be described.
　図３は、本発明の第１の実施の形態に係る自励式無効電力補償装置の動作を示す波形図である。図３において、ＶＣは平滑用コンデンサＣの両端電圧である。図４は、本発明の第１の実施の形態に係る自励式無効電力補償装置の停止シーケンスおよび再起動シーケンスを示す図である。 FIG. 3 is a waveform diagram showing the operation of the self-excited reactive power compensator according to the first embodiment of the present invention. In FIG. 3, VC is a voltage across the smoothing capacitor C. FIG. 4 is a diagram showing a stop sequence and a restart sequence of the self-excited reactive power compensator according to the first embodiment of the present invention.
　図３および図４を参照して、自励式無効電力補償装置１０１における制御部１０は、時刻ｔ０すなわち上位装置から起動指令を受ける前の状態において、スイッチＳＷＡをオフし、スイッチＳＷＢをオンし、スイッチＳＷＣをオフする。スイッチＳＷＢをオンすることにより、放電器５３によって平滑用コンデンサＣが確実に放電され、装置のメンテナンス性を向上させることができる。 Referring to FIG. 3 and FIG. 4, control unit 10 in self-excited reactive power compensator 101 turns off switch SWA and turns on switch SWB at time t0, that is, before the start command is received from the host device. Switch SWC is turned off. By turning on the switch SWB, the smoothing capacitor C is reliably discharged by the discharger 53, and the maintainability of the apparatus can be improved.
　時刻ｔ１において、制御部１０は、上位装置から起動指令を受けて、スイッチＳＷＡをオンし、スイッチＳＷＢをオフする。これにより、充電器５１によって平滑用コンデンサＣが充電される、すなわち交流電源６から供給される交流電圧によって平滑用コンデンサＣの両端電圧ＶＣが上昇する。 At time t1, the control unit 10 receives a start command from the host device, turns on the switch SWA, and turns off the switch SWB. As a result, the smoothing capacitor C is charged by the charger 51, that is, the voltage VC across the smoothing capacitor C is increased by the AC voltage supplied from the AC power supply 6.
　時刻ｔ２において、電圧ＶＣが所定値Ｖ１より大きい所定値Ｖ２に達すると、制御部１０はスイッチＳＷＡをオフする。これにより、充電器５１による平滑用コンデンサＣの充電が停止する。そして、制御部１０は、スイッチング素子Ｑ１～Ｑ６へ駆動信号を出力し、スイッチング素子Ｑ１～Ｑ６のスイッチングを再開させる。なお、スイッチＳＷＡがオフされた後も、スイッチング素子Ｑ１～Ｑ６のスイッチングによってコンデンサＣは充電されるため、電圧ＶＣは所定値Ｖ２以上を維持する。 When the voltage VC reaches a predetermined value V2 larger than the predetermined value V1 at time t2, the control unit 10 turns off the switch SWA. Thereby, the charging of the smoothing capacitor C by the charger 51 is stopped. Then, control unit 10 outputs a drive signal to switching elements Q1 to Q6, and restarts switching of switching elements Q1 to Q6. Even after the switch SWA is turned off, the capacitor C is charged by the switching of the switching elements Q1 to Q6, so that the voltage VC is maintained at a predetermined value V2 or more.
　時刻ｔ３において、電力系統３が停電等して上位装置から停止指令が自励式無効電力補償装置１０１へ出力される（ステップＳ１）。このとき、電力系統３からの電力によって電圧ＶＣは大きく上昇する。制御部１０は、上位装置からこの停止指令を受けて、スイッチング素子Ｑ１～Ｑ６への駆動信号の出力を停止することにより、スイッチング素子Ｑ１～Ｑ６のスイッチングを停止させる、すなわち自励式変換器１を停止させる。これにより、自励式無効電力補償装置１０１から電力系統３への無効電力の出力が停止する（ステップＳ２）。 At time t3, the power system 3 is blacked out, and a stop command is output from the host device to the self-excited reactive power compensator 101 (step S1). At this time, the voltage VC greatly increases due to the power from the power system 3. The control unit 10 receives this stop command from the host device and stops the output of the drive signals to the switching elements Q1 to Q6, thereby stopping the switching of the switching elements Q1 to Q6, that is, the self-excited converter 1 Stop. Thereby, the output of the reactive power from the self-excited reactive power compensator 101 to the power system 3 is stopped (step S2).
　時刻ｔ４において、電圧ＶＣが所定値Ｖ２より大きい所定値Ｖ３に達すると、制御部１０はスイッチＳＷＣをオンする。これにより、放電器５２によって平滑用コンデンサＣが急速放電される。 At time t4, when the voltage VC reaches a predetermined value V3 larger than the predetermined value V2, the control unit 10 turns on the switch SWC. As a result, the smoothing capacitor C is rapidly discharged by the discharger 52.
　時刻ｔ５において、電圧ＶＣが所定値Ｖ２に達すると、制御部１０はスイッチＳＷＣをオフする。これにより、放電器５２による平滑用コンデンサＣの急速放電が停止する。スイッチＳＷＣがオフされた後も、電圧ＶＣは低下している。 When the voltage VC reaches the predetermined value V2 at time t5, the control unit 10 turns off the switch SWC. Thereby, the rapid discharge of the smoothing capacitor C by the discharger 52 is stopped. Even after the switch SWC is turned off, the voltage VC decreases.
　時刻ｔ６において、電圧ＶＣが所定値Ｖ２より小さい所定値Ｖ１未満になると、制御部１０は、電圧ＶＣが所定値Ｖ２に達するまでスイッチＳＷＡをオンする。これにより、充電器５１によって平滑用コンデンサＣが充電される。 When the voltage VC becomes less than the predetermined value V1 smaller than the predetermined value V2 at time t6, the control unit 10 turns on the switch SWA until the voltage VC reaches the predetermined value V2. As a result, the smoothing capacitor C is charged by the charger 51.
　時刻ｔ７において、電力系統３が停電から復帰して上位装置からの停止指令が解除される（ステップＳ３）。制御部１０は、上位装置からの停止指令が解除されると、自励式変換器１の停止を解除する、すなわちスイッチング素子Ｑ１～Ｑ６へ駆動信号を出力し、スイッチング素子Ｑ１～Ｑ６のスイッチングを再開させる（ステップＳ４）。これにより、自励式無効電力補償装置１０１から電力系統３への無効電力の出力が再開される（ステップＳ５）。 At time t7, the power system 3 recovers from the power failure and the stop command from the host device is released (step S3). When the stop command from the host device is released, the control unit 10 releases the stop of the self-excited converter 1, that is, outputs a drive signal to the switching elements Q1 to Q6, and resumes switching of the switching elements Q1 to Q6. (Step S4). Thereby, the output of the reactive power from the self-excited reactive power compensator 101 to the power system 3 is resumed (step S5).
　以上のように、本発明の第１の実施の形態に係る自励式無効電力補償装置では、制御部１０は、充電器５１を制御することにより、コンデンサＣの両端電圧が所定値Ｖ１以上になるようにコンデンサＣを充電する充電制御を行なう。より詳細には、制御部１０は、電圧検出器９によって検出された電圧が所定値Ｖ１未満になると充電制御を行ない、電圧検出器９によって検出された電圧が所定値Ｖ１より大きく所定値Ｖ３より小さい所定値Ｖ２になると充電制御を停止する。 As described above, in the self-excited reactive power compensator according to the first embodiment of the present invention, the control unit 10 controls the charger 51 so that the voltage across the capacitor C becomes equal to or higher than the predetermined value V1. Thus, charging control for charging the capacitor C is performed. More specifically, the control unit 10 performs charge control when the voltage detected by the voltage detector 9 is less than the predetermined value V1, and the voltage detected by the voltage detector 9 is greater than the predetermined value V1 and higher than the predetermined value V3. When the small predetermined value V2 is reached, the charging control is stopped.
　このような構成により、停止指令を受けて自励式変換器１におけるスイッチング素子Ｑ１～Ｑ６のスイッチングを停止しても、平滑用コンデンサＣの両端電圧を一定レベルに維持することができるため、停止指令が解除された後に平滑用コンデンサＣを再充電する必要がなくなり、自励式変換器１におけるスイッチング素子Ｑ１～Ｑ６のスイッチングを早期に再開することができる。したがって、本発明の第１の実施の形態に係る自励式無効電力補償装置では、停止指令を受けて運転を停止している状態において、停止指令が解除されると早期に運転を再開することができる。 With such a configuration, even if the switching of the switching elements Q1 to Q6 in the self-excited converter 1 is stopped upon receiving a stop command, the voltage across the smoothing capacitor C can be maintained at a constant level. It is no longer necessary to recharge the smoothing capacitor C after the release of, and switching of the switching elements Q1 to Q6 in the self-excited converter 1 can be resumed early. Therefore, in the self-excited reactive power compensator according to the first embodiment of the present invention, in the state where the operation is stopped in response to the stop command, the operation can be resumed early when the stop command is canceled. it can.
　また、本発明の第１の実施の形態に係る自励式無効電力補償装置では、コンデンサＣを放電するための放電器５２を備える。そして、制御部１０は、電圧検出器９によって検出された電圧が所定値Ｖ１より大きい所定値Ｖ３以上になると、放電器５２を制御してコンデンサＣを放電する。このような構成により、後述する本発明の第２の実施の形態に係る自励式無効電力補償装置と比べて、電力系統３からの電力による平滑用コンデンサＣの過充電を防ぐための遮断器ＣＢを開放する操作が不要になるという利点がある。 Further, the self-excited reactive power compensator according to the first embodiment of the present invention includes a discharger 52 for discharging the capacitor C. Then, when the voltage detected by the voltage detector 9 becomes equal to or higher than a predetermined value V3 larger than the predetermined value V1, the control unit 10 controls the discharger 52 to discharge the capacitor C. With such a configuration, a circuit breaker CB for preventing overcharging of the smoothing capacitor C due to power from the power system 3 as compared with a self-excited reactive power compensator according to a second embodiment of the present invention to be described later. There is an advantage that the operation of opening the screen becomes unnecessary.
　なお、本発明の第１の実施の形態に係る自励式無効電力補償装置では、制御部１０は、電圧ＶＣが所定値Ｖ１未満になるとスイッチＳＷＡをオンして充電器５１の充電動作を開始する構成であるとしたが、これに限定するものではない。上位装置から停止指令を受けてすぐにスイッチＳＷＡをオンし、充電器５１の充電動作を開始する構成であってもよい。 In the self-excited reactive power compensator according to the first embodiment of the present invention, the control unit 10 turns on the switch SWA and starts the charging operation of the charger 51 when the voltage VC becomes less than the predetermined value V1. Although it is the configuration, it is not limited to this. The switch SWA may be turned on immediately after receiving a stop command from the host device, and the charging operation of the charger 51 may be started.
　次に、本発明の他の実施の形態について図面を用いて説明する。なお、図中同一または相当部分には同一符号を付してその説明は繰り返さない。 Next, another embodiment of the present invention will be described with reference to the drawings. In the drawings, the same or corresponding parts are denoted by the same reference numerals and description thereof will not be repeated.
　＜第２の実施の形態＞
　本実施の形態は、第１の実施の形態に係る自励式無効電力補償装置と比べて停止シーケンスおよび再起動シーケンスを変更した自励式無効電力補償装置に関する。以下で説明する内容以外は第１の実施の形態に係る自励式無効電力補償装置と同様である。 <Second Embodiment>
The present embodiment relates to a self-excited reactive power compensator in which the stop sequence and the restart sequence are changed as compared with the self-excited reactive power compensator according to the first embodiment. The contents other than those described below are the same as those of the self-excited reactive power compensator according to the first embodiment.
　図５は、本発明の第２の実施の形態に係る自励式無効電力補償装置の構成図である。
　図５を参照して、自励式無効電力補償装置１０２は、本発明の第１の実施の形態に係る自励式無効電力補償装置と比べて、さらに遮断器ＣＢを備え、放電器５２を備えない。遮断器ＣＢは、電力系統３と自励式変換器１との電気的接続を遮断するために設けられる。 FIG. 5 is a configuration diagram of a self-excited reactive power compensator according to the second embodiment of the present invention.
Referring to FIG. 5, self-excited reactive power compensator 102 is further provided with a circuit breaker CB and not a discharger 52 as compared with the self-excited reactive power compensator according to the first embodiment of the present invention. . The circuit breaker CB is provided to interrupt the electrical connection between the power system 3 and the self-excited converter 1.
　図６は、本発明の第２の実施の形態に係る自励式無効電力補償装置の動作を示す波形図である。図６において、ＶＣは平滑用コンデンサＣの両端電圧である。図７は、本発明の第２の実施の形態に係る自励式無効電力補償装置の停止シーケンスおよび再起動シーケンスを示す図である。 FIG. 6 is a waveform diagram showing the operation of the self-excited reactive power compensator according to the second embodiment of the present invention. In FIG. 6, VC is the voltage across the smoothing capacitor C. FIG. 7 is a diagram illustrating a stop sequence and a restart sequence of the self-excited reactive power compensator according to the second embodiment of the present invention.
　図６および図７を参照して、自励式無効電力補償装置１０２における制御部１０は、時刻ｔ０すなわち上位装置から起動指令を受ける前の状態において、スイッチＳＷＡをオフし、スイッチＳＷＢをオンし、遮断器ＣＢを開放する。スイッチＳＷＢをオンすることにより、放電器５３によって平滑用コンデンサＣが確実に放電され、装置のメンテナンス性を向上させることができる。また、遮断器ＣＢを開放することにより、電力系統３からの電力によって平滑用コンデンサＣが充電されることを防ぐことができる。 Referring to FIGS. 6 and 7, control unit 10 in self-excited reactive power compensator 102 turns off switch SWA and turns on switch SWB at time t0, that is, before the start command is received from the host device. Open the circuit breaker CB. By turning on the switch SWB, the smoothing capacitor C is reliably discharged by the discharger 53, and the maintainability of the apparatus can be improved. Further, by opening the circuit breaker CB, it is possible to prevent the smoothing capacitor C from being charged by the power from the power system 3.
　時刻ｔ１において、制御部１０は、上位装置から起動指令を受けて、スイッチＳＷＡをオンし、スイッチＳＷＢをオフし、遮断器ＣＢを投入する。これにより、電力系統３と自励式変換器１とが電気的に接続される。また、充電器５１によって平滑用コンデンサＣが充電される、すなわち交流電源６から供給される交流電圧によって平滑用コンデンサＣの両端電圧ＶＣが上昇する。 At time t1, the control unit 10 receives a start command from the host device, turns on the switch SWA, turns off the switch SWB, and turns on the circuit breaker CB. Thereby, the electric power system 3 and the self-excited converter 1 are electrically connected. Further, the smoothing capacitor C is charged by the charger 51, that is, the voltage VC across the smoothing capacitor C is increased by the AC voltage supplied from the AC power supply 6.
　時刻ｔ２において、電圧ＶＣが所定値Ｖ１より大きい所定値Ｖ２に達すると、制御部１０はスイッチＳＷＡをオフする。これにより、充電器５１による平滑用コンデンサＣの充電が停止する。そして、制御部１０は、スイッチング素子Ｑ１～Ｑ６へ駆動信号を出力し、スイッチング素子Ｑ１～Ｑ６のスイッチングを再開させる。なお、スイッチＳＷＡがオフされた後も、スイッチング素子Ｑ１～Ｑ６のスイッチングによってコンデンサＣは充電されるため、電圧ＶＣは所定値Ｖ２以上を維持する。 When the voltage VC reaches a predetermined value V2 larger than the predetermined value V1 at time t2, the control unit 10 turns off the switch SWA. Thereby, the charging of the smoothing capacitor C by the charger 51 is stopped. Then, control unit 10 outputs a drive signal to switching elements Q1 to Q6, and restarts switching of switching elements Q1 to Q6. Even after the switch SWA is turned off, the capacitor C is charged by the switching of the switching elements Q1 to Q6, so that the voltage VC is maintained at a predetermined value V2 or more.
　時刻ｔ３において、電力系統３が停電等して上位装置から停止指令が自励式無効電力補償装置１０２へ出力される（ステップＳ１１）。このとき、電圧ＶＣは大きく低下する。制御部１０は、上位装置からこの停止指令を受けて、スイッチング素子Ｑ１～Ｑ６への駆動信号の出力を停止することにより、スイッチング素子Ｑ１～Ｑ６のスイッチングを停止させる、すなわち自励式変換器１を停止させる。これにより、自励式無効電力補償装置１０２から電力系統３への無効電力の出力が停止する（ステップＳ１２）。 At time t3, the power system 3 is blacked out, and a stop command is output from the host device to the self-excited reactive power compensator 102 (step S11). At this time, the voltage VC greatly decreases. The control unit 10 receives this stop command from the host device and stops the output of the drive signals to the switching elements Q1 to Q6, thereby stopping the switching of the switching elements Q1 to Q6, that is, the self-excited converter 1 Stop. Thereby, the output of the reactive power from the self-excited reactive power compensator 102 to the power system 3 is stopped (step S12).
　そして、制御部１０は、遮断器ＣＢを開放することにより、電力系統３と自励式変換器１との電気的接続を遮断する（ステップＳ１３）。なお、ステップＳ１２およびステップＳ１３の実行順序は逆であってもよい。 And the control part 10 interrupts | blocks the electrical connection of the electric power grid | system 3 and the self-excited converter 1 by open | releasing the circuit breaker CB (step S13). Note that the execution order of step S12 and step S13 may be reversed.
　時刻ｔ４において、電圧ＶＣが所定値Ｖ２より小さい所定値Ｖ１未満となると、制御部１０はスイッチＳＷＡをオンする。これにより、充電器５１によって平滑用コンデンサＣが充電される。 At time t4, when the voltage VC becomes less than the predetermined value V1 smaller than the predetermined value V2, the control unit 10 turns on the switch SWA. As a result, the smoothing capacitor C is charged by the charger 51.
　時刻ｔ５において、電圧ＶＣが所定値Ｖ２に達すると、制御部１０はスイッチＳＷＡをオフする。これにより、充電器５１による平滑用コンデンサＣの充電が停止する。 At time t5, when the voltage VC reaches the predetermined value V2, the control unit 10 turns off the switch SWA. Thereby, the charging of the smoothing capacitor C by the charger 51 is stopped.
　時刻ｔ６において、電力系統３が停電から復帰して上位装置からの停止指令が解除される（ステップＳ１４）。制御部１０は、上位装置からの停止指令が解除されると、自励式変換器１の停止を解除する、すなわちスイッチング素子Ｑ１～Ｑ６へ駆動信号を出力し、スイッチング素子Ｑ１～Ｑ６のスイッチングを再開させる（ステップＳ１５）。 At time t6, the power system 3 returns from the power failure and the stop command from the host device is released (step S14). When the stop command from the host device is released, the control unit 10 releases the stop of the self-excited converter 1, that is, outputs a drive signal to the switching elements Q1 to Q6, and resumes switching of the switching elements Q1 to Q6. (Step S15).
　そして、制御部１０は、遮断器ＣＢを投入することにより、電力系統３と自励式変換器１とを電気的に接続する（ステップＳ１６）。なお、ステップＳ１５およびステップＳ１６の実行順序は逆であってもよい。 And the control part 10 electrically connects the electric power grid | system 3 and the self-excited converter 1 by throwing in the circuit breaker CB (step S16). Note that the execution order of step S15 and step S16 may be reversed.
　ステップＳ１５およびステップＳ１６により、自励式無効電力補償装置１０２から電力系統３への無効電力の出力が再開される（ステップＳ１７）。 The output of the reactive power from the self-excited reactive power compensator 102 to the power system 3 is restarted through steps S15 and S16 (step S17).
　その他の構成および動作は第１の実施の形態に係る自励式無効電力補償装置と同様であるため、ここでは詳細な説明を繰り返さない。 Other configurations and operations are the same as those of the self-excited reactive power compensator according to the first embodiment, and thus detailed description thereof will not be repeated here.
　以上のように、本発明の第２の実施の形態に係る自励式無効電力補償装置では、制御部１０は、自励式無効電力補償装置１０２を停止するための停止指令を受けてスイッチング素子Ｑ１～Ｑ６のスイッチングを停止し、かつ遮断器ＣＢを制御して電力系統３と自励式変換器１との電気的接続を遮断する。そして、制御部１０は、停止指令が解除されるとスイッチング素子Ｑ１～Ｑ６のスイッチングを再開し、かつ遮断器ＣＢを制御して電力系統３と自励式変換器１とを電気的に接続する。 As described above, in the self-excited reactive power compensator according to the second embodiment of the present invention, the control unit 10 receives the stop command for stopping the self-excited reactive power compensator 102 and switches the switching elements Q1˜ The switching of Q6 is stopped, and the circuit breaker CB is controlled to cut off the electrical connection between the power system 3 and the self-excited converter 1. Then, when the stop command is released, control unit 10 resumes switching of switching elements Q1 to Q6, and controls breaker CB to electrically connect power system 3 and self-excited converter 1.
　このような構成により、第１の実施の形態に係る自励式無効電力補償装置と同様に、停止指令を受けて運転を停止している状態において、停止指令が解除されると早期に運転を再開することができる。また、停止指令を受けてからその停止指令が解除されるまで、電力系統３からの電力によって平滑用コンデンサＣが過充電されることを防ぐことができるため、第１の実施の形態に係る自励式無効電力補償装置と比べて、放電器５２が不要となる。 With such a configuration, as with the self-excited reactive power compensator according to the first embodiment, in the state where the operation is stopped in response to the stop command, the operation is resumed as soon as the stop command is released. can do. In addition, since the smoothing capacitor C can be prevented from being overcharged by the electric power from the power system 3 until the stop command is canceled after the stop command is received, the self-according to the first embodiment. Compared with the excited reactive power compensator, the discharger 52 becomes unnecessary.
　今回開示された実施の形態はすべての点で例示であって制限的なものではないと考えられるべきである。本発明の範囲は上記した説明ではなくて請求の範囲によって示され、請求の範囲と均等の意味および範囲内でのすべての変更が含まれることが意図される。 The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.
　１　自励式変換器、２　変換器用変圧器、４　電圧検出器、５　電流検出器、７　変圧器、８　整流器、９　電圧検出器、１０　制御部、１１　振幅検出部、１２　無効電流検出部、１３　電圧指令生成部、１４，１６　減算器、１５　電圧制御部、１７　無効電流制御部、２１　ゲートパルス発生部、５１　充電器、５２　放電器、５３　放電器、１０１，１０２　自励式無効電力補償装置、Ｃ　平滑用コンデンサ、Ｒ１，Ｒ２，Ｒ３　抵抗、ＳＷＡ，ＳＷＢ，ＳＷＣ　スイッチ、Ｑ１～Ｑ６　スイッチング素子、Ｄ１～Ｄ６　ダイオード、ＣＢ　遮断器。 1 self-excited converter, 2 transformer, 4 voltage detector, 5 current detector, 7 transformer, 8 rectifier, 9 voltage detector, 10 control unit, 11 amplitude detection unit, 12 reactive current detection unit, 13 Voltage command generator, 14, 16 subtractor, 15 voltage controller, 17 reactive current controller, 21 gate pulse generator, 51 charger, 52 discharger, 53 discharger, 101, 102 self-excited reactive power compensator, C smoothing capacitor, R1, R2, R3 resistance, SWA, SWB, SWC switch, Q1-Q6 switching element, D1-D6 diode, CB breaker.

Claims (7)

  1. 　交流電圧を平滑化するためのコンデンサ（Ｃ）と、
    　複数の相を有する電力系統（３）に結合され、スイッチング素子を含み、前記コンデンサ（Ｃ）によって平滑化された電力に基づいて前記電力系統（３）へ無効電力を出力するための自励式変換器（１）と、
    　前記電力系統（３）の電圧を検出するための第１の電圧検出器（４）と、
    　前記コンデンサ（Ｃ）の両端電圧を検出するための第２の電圧検出器（９）と、
    　前記電力系統（３）と前記自励式変換器（１）との間に流れる電流を検出するための電流検出器（５）と、
    　前記第１の電圧検出器（４）によって検出された電圧および前記電流検出器（５）によって検出された電流に基づいて前記スイッチング素子をスイッチングさせることにより、前記自励式変換器（１）から前記電力系統（３）へ出力される前記無効電力を制御するための制御部（１０）と、
    　前記コンデンサ（Ｃ）を充電するための充電器（５１）とを備え、
    　前記制御部（１０）は、前記充電器（５１）を制御することにより、前記第２の電圧検出器（９）によって検出される電圧が第１の所定値以上になるように前記コンデンサ（Ｃ）を充電する充電制御を行なう自励式無効電力補償装置。     A capacitor (C) for smoothing the AC voltage;
    Self-excited conversion for outputting reactive power to the power system (3) based on power coupled to a power system (3) having a plurality of phases, including switching elements, and smoothed by the capacitor (C) Vessel (1),
    A first voltage detector (4) for detecting the voltage of the power system (3);
    A second voltage detector (9) for detecting the voltage across the capacitor (C);
    A current detector (5) for detecting a current flowing between the power system (3) and the self-excited converter (1);
    From the self-excited converter (1) by switching the switching element based on the voltage detected by the first voltage detector (4) and the current detected by the current detector (5). A control unit (10) for controlling the reactive power output to the power system (3);
    A charger (51) for charging the capacitor (C),
    The controller (10) controls the charger (51) so that the voltage detected by the second voltage detector (9) is equal to or higher than a first predetermined value. A self-excited reactive power compensator that performs charge control for charging.
  2. 　前記自励式無効電力補償装置は、さらに、
    　前記コンデンサ（Ｃ）を放電するための第１の放電器（５２）を備え、
    　前記制御部（１０）は、前記第２の電圧検出器（９）によって検出された電圧が前記第１の所定値より大きい第２の所定値以上になると、前記第１の放電器（５２）を制御して前記コンデンサ（Ｃ）を放電する請求の範囲第１項に記載の自励式無効電力補償装置。     The self-excited reactive power compensator further includes:
    A first discharger (52) for discharging the capacitor (C);
    When the voltage detected by the second voltage detector (9) becomes equal to or higher than a second predetermined value that is greater than the first predetermined value, the control unit (10) is configured to output the first discharger (52). The self-excited reactive power compensator according to claim 1, wherein the capacitor (C) is discharged by controlling the power.
  3. 　前記制御部（１０）は、前記第２の電圧検出器（９）によって検出された電圧が前記第１の所定値未満になると前記充電制御を行ない、
    　前記制御部（１０）は、前記第２の電圧検出器（９）によって検出された電圧が前記第１の所定値より大きく前記第２の所定値より小さい第３の所定値になると前記充電制御を停止する請求の範囲第２項に記載の自励式無効電力補償装置。     The controller (10) performs the charging control when the voltage detected by the second voltage detector (9) is less than the first predetermined value,
    When the voltage detected by the second voltage detector (9) becomes a third predetermined value that is greater than the first predetermined value and smaller than the second predetermined value, the control unit (10) performs the charge control. The self-excited reactive power compensator according to claim 2, which stops the operation.
  4. 　前記制御部（１０）は、前記自励式無効電力補償装置を停止するための停止指令を受けて前記スイッチング素子のスイッチングを停止し、
    　前記制御部（１０）は、前記停止指令が解除されると前記スイッチング素子のスイッチングを再開する請求の範囲第３項に記載の自励式無効電力補償装置。     The control unit (10) receives a stop command for stopping the self-excited reactive power compensator, and stops switching of the switching element,
    The self-excited reactive power compensator according to claim 3, wherein the control unit (10) restarts switching of the switching element when the stop command is released.
  5. 　前記自励式無効電力補償装置は、さらに、
    　前記コンデンサ（Ｃ）を放電し、前記第１の放電器（５２）より大きい放電時定数を有する第２の放電器（５３）を備える請求の範囲第２項に記載の自励式無効電力補償装置。     The self-excited reactive power compensator further includes:
    The self-excited reactive power compensator according to claim 2, further comprising a second discharger (53) that discharges the capacitor (C) and has a discharge time constant larger than that of the first discharger (52). .
  6. 　前記制御部（１０）は、前記自励式無効電力補償装置を停止するための停止指令を受けて前記スイッチング素子のスイッチングを停止し、
    　前記制御部（１０）は、前記停止指令が解除されると前記スイッチング素子のスイッチングを再開する請求の範囲第１項に記載の自励式無効電力補償装置。     The control unit (10) receives a stop command for stopping the self-excited reactive power compensator, and stops switching of the switching element,
    The self-excited reactive power compensator according to claim 1, wherein the controller (10) restarts switching of the switching element when the stop command is released.
  7. 　前記自励式無効電力補償装置は、さらに、
    　前記電力系統（３）と前記自励式変換器（１）との電気的接続を遮断するための遮断器（ＣＢ）を備え、
    　前記制御部（１０）は、前記自励式無効電力補償装置を停止するための停止指令を受けて前記スイッチング素子のスイッチングを停止し、かつ前記遮断器（ＣＢ）を制御して前記電力系統（３）と前記自励式変換器（１）との電気的接続を遮断し、
    　前記制御部（１０）は、前記停止指令が解除されると前記スイッチング素子のスイッチングを再開し、かつ前記遮断器（ＣＢ）を制御して前記電力系統（３）と前記自励式変換器（１）とを電気的に接続する請求の範囲第１項に記載の自励式無効電力補償装置。     The self-excited reactive power compensator further includes:
    A circuit breaker (CB) for interrupting an electrical connection between the power system (3) and the self-excited converter (1);
    The controller (10) receives a stop command for stopping the self-excited reactive power compensator, stops the switching of the switching element, and controls the breaker (CB) to control the power system (3 ) And the self-excited converter (1) are disconnected,
    When the stop command is released, the control unit (10) resumes switching of the switching element and controls the circuit breaker (CB) to control the power system (3) and the self-excited converter (1). And the self-excited reactive power compensator according to claim 1.
PCT/JP2009/063325 2009-07-27 2009-07-27 Self-excited reactive power compensation device WO2011013187A1 (en)

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