WO2016207976A1 - 電力変換装置および直流送電システム - Google Patents
電力変換装置および直流送電システム Download PDFInfo
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- WO2016207976A1 WO2016207976A1 PCT/JP2015/068028 JP2015068028W WO2016207976A1 WO 2016207976 A1 WO2016207976 A1 WO 2016207976A1 JP 2015068028 W JP2015068028 W JP 2015068028W WO 2016207976 A1 WO2016207976 A1 WO 2016207976A1
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/08—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/10—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers
- H02H7/12—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/10—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers
- H02H7/12—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers
- H02H7/1216—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers for AC-AC converters
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
- H02H7/268—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured for dc systems
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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
- H02J1/00—Circuit arrangements for dc mains or dc distribution networks
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—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
- H02M1/00—Details of apparatus for conversion
- H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—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
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—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
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
- H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
- H02M7/12—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
- H02M7/21—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 using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/217—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 using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—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
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—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
- H02M7/483—Converters with outputs that each can have more than two voltages levels
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—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
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—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
- H02M7/483—Converters with outputs that each can have more than two voltages levels
- H02M7/4835—Converters with outputs that each can have more than two voltages levels comprising two or more cells, each including a switchable capacitor, the capacitors having a nominal charge voltage which corresponds to a given fraction of the input voltage, and the capacitors being selectively connected in series to determine the instantaneous output voltage
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—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
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
- H02M1/325—Means for protecting converters other than automatic disconnection with means for allowing continuous operation despite a fault, i.e. fault tolerant converters
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- 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
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/60—Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]
Definitions
- the present disclosure relates to a power conversion device and a DC power transmission system, and more particularly, to a self-excited power conversion device used for a DC transmission system having a multipolar configuration, and a system of the DC transmission system.
- High-voltage DC transmission can reduce transmission loss and transmission line equipment costs, and long-distance transmission is more advantageous than AC transmission in terms of cost. For this reason, high-voltage direct current power transmission is rapidly spreading both at home and abroad.
- Such a high-voltage DC transmission employs a power converter for converting AC system power into DC power, or converting DC power flowing in a DC line into AC power.
- a separately-excited converter using a thyristor has been used as the power converter, but recently, the application of a self-excited voltage-type converter has been studied.
- Patent Document 1 discloses a method for operating a DC power transmission facility.
- this operation method when one of a plurality of self-excited AC / DC converters connected in series or in parallel fails, and the failed self-excited AC / DC converter is connected in series, the failed self-excited AC / DC converter In the case of parallel connection, the faulty self-excited AC / DC converter is disconnected from the DC system, and the operation is continued using a sound self-excited AC / DC converter.
- MMC Modular Multilevel Converter
- the MMC is configured to realize a high withstand voltage by connecting a chopper circuit to each arm in multiple stages and to output an AC voltage.
- Such an MMC is applied to, for example, a DC transmission system having a bipolar configuration known as a configuration of a general DC transmission system.
- a bipolar DC transmission system if an accident occurs on the DC transmission line (main line), the main line, forward converter, and reverse converter on the side where the accident occurred are stopped, but the main line, The converter and the inverse converter are required to be used continuously.
- the DC transmission line accident is an overhead line accident
- the main line, forward converter and reverse converter on the side where the accident occurred are also required to restart immediately after the accident is removed. .
- Patent Document 1 discloses that the faulty self-excited AC / DC converter is disconnected from the DC system and the operation is continued using a sound self-excited AC / DC converter.
- this is a countermeasure only for the failure of the self-excited AC / DC converter itself, and there is a problem that the above requirement cannot be satisfied because no accident is assumed in the DC transmission line.
- the present disclosure has been made in view of the above-described problems, and an object in one aspect is a self-excited type capable of detecting and removing an accident more quickly in a DC transmission system having a multipolar configuration. It is providing a power converter device and a direct-current power transmission system.
- a power conversion device used in a DC transmission system having a multipolar configuration having at least two main lines.
- the power converter includes an AC / DC converter that converts power between an AC system and a main line, and a control device.
- the AC / DC converter includes at least one phase module.
- the phase module includes an AC terminal, a DC terminal on the main line side, a DC terminal on the neutral point side, a first arm provided between the DC terminal on the main line side and the AC terminal, and a DC terminal on the neutral point side.
- a second arm provided between the AC terminal and the AC terminal.
- Each of the first arm and the second arm has a plurality of cells connected in series.
- Each of the plurality of cells includes a switching element, and a diode and a capacitor connected in parallel to the switching element.
- At least one bypass switch for short-circuiting the plurality of cells is connected to the plurality of cells.
- the control device includes a current input unit that receives an input of a current value between a DC terminal on the neutral point side and the neutral point or a current value between the DC terminal on the main line side and the main line, and an AC / DC converter
- flow terminal by the side of a neutral point, and a neutral point are included.
- the converter control unit turns on the bypass switch after stopping the plurality of cells when the current value is greater than or equal to a predetermined threshold value.
- the switch control unit opens the first switch when the current value is equal to or greater than a predetermined threshold value.
- FIG. 1 It is a figure which shows an example of the whole structure of a DC power transmission system. It is a figure for demonstrating the structure of a power converter device. It is a figure which shows the circuit structure of a cell. It is a figure which shows the flow of the accident electric current of the 1st situation immediately after the occurrence of the accident in the main line. It is a figure which shows the flow of the accident electric current of the 2nd aspect after the 1st aspect shown in FIG. It is a figure which shows the flow of the accident electric current of the 3rd aspect after the 2nd aspect shown in FIG. It is a figure which shows the flow of the accident electric current of the 4th aspect after the 3rd aspect shown in FIG. It is a functional block diagram of the control apparatus of a power converter device.
- FIG. 1 is a diagram illustrating an example of the overall configuration of a DC power transmission system.
- the DC power transmission system is a DC power transmission system (bipolar DC power transmission system) having a bipolar configuration composed of two poles of DC power transmission lines (main lines) 9 and 10 and a neutral wire 11.
- the bipolar DC power transmission system is formed by connecting neutral points 13 and 13A of two DC power transmission systems divided into positive and negative two poles by one neutral wire 11. Electric power is transmitted and received between the two AC systems 2 and 2A via the main lines 9 and 10.
- the power conversion devices 5 and 5A, the pole composed of the main line 9 and the neutral wire 11 on the positive electrode side are referred to as a first pole
- the power conversion devices 5B and 5C, the main line 10 on the negative electrode side and the neutral wire 11 are neutral.
- a pole formed by the line 11 is defined as a second pole. The first pole and the second pole share the neutral wire 11.
- AC bus 1 is connected to power converter 5 via AC circuit breaker 3 and transformer 4, and is connected to power converter 5B via AC circuit breaker 3B and transformer 4B.
- AC bus 1A is connected to power converter 5A via AC breaker 3A and transformer 4A, and is connected to power converter 5C via AC breaker 3C and transformer 4C.
- the power converters 5 to 5C are connected to the neutral wire 11 via the circuit breakers 12 to 12C, respectively.
- the power converters 5 and 5 ⁇ / b> A are connected to the main line 9, and the power converters 5 ⁇ / b> B and 5 ⁇ / b> C are connected to the main line 10.
- the power converters 5 and 5B function as forward converters and are connected in series.
- the power conversion devices 5A and 5C function as inverse conversion devices and are connected in series.
- AC power is converted into DC power by the power converters 5 and 5 ⁇ / b> B, and the converted DC power is DC transmitted via the main lines 9 and 10.
- DC power is converted into AC power by the power converters 5A and 5C at the power receiving end, and supplied to the AC bus 1A via the transformers 4A and 4C.
- the power conversion devices 5 and 5A function as reverse conversion devices and the power conversion devices 5B and 5C function as forward conversion devices, the reverse conversion operation is performed.
- the neutral wire 11 is provided for flowing an unbalanced DC current between the bipolar electrodes and a DC current during unipolar operation.
- FIG. 2 is a diagram for explaining the configuration of the power converter. Below, the structure of the power converter device 5 is demonstrated for convenience of explanation. The configurations of the power conversion devices 5A to 5C are the same as the configuration of the power conversion device 5.
- the power conversion device 5 includes a control device 100 and an AC / DC converter 20.
- the AC / DC converter 20 is a self-excited voltage type power converter that can control active power and reactive power independently.
- the AC / DC converter 20 includes three phase modules 21, 22, and 23 connected in parallel to each other.
- the phase module 21 includes an AC terminal 31, a DC terminal 41p on the positive electrode side (main line 9 side), a DC terminal 41n on the negative electrode side (neutral wire 11 side), an upper arm (cell L1 and cell L2), Arm (cell L3 and cell L4).
- the phase module 22 includes an AC terminal 32, a positive DC terminal 42p, a negative DC terminal 42n, an upper arm (cell L5 and cell L6), and a lower arm (cell L7 and cell L8).
- the phase module 23 includes an AC terminal 33, a positive DC terminal 43p, a negative DC terminal 43n, an upper arm (cell L9 and cell L10), and a lower arm (cell L11 and cell L12).
- each arm may be configured by one or three or more cells L.
- the AC terminals 31 to 33 are connected to the AC system 2 via the transformer 4, the AC circuit breaker 3, and the AC bus 1.
- the DC terminals 41p to 43p are connected to the main line 9, and the DC terminals 41n to 43n are connected to the neutral line 11 through the circuit breaker 12.
- the AC circuit breaker 3 is provided between the AC terminals 31 to 33 via the transformer 4 and the AC system 2.
- the circuit breaker 12 is provided between the neutral points 13 and the DC terminals 41n to 43n on the neutral point 13 (neutral wire 11) side.
- FIG. 3 is a diagram showing a circuit configuration of the cell L.
- the configuration of the cells L1 to L12 is the same as that of the cell L shown in FIG. Referring to FIG. 3, cell L includes two switching elements Q1, Q2, two diodes D1, D2, and a capacitor C.
- the cell L operates (drives) when the two switching elements Q1, Q2 are switched based on the gate signal transmitted from the control device 100.
- Switching elements Q1, Q2 are power semiconductor elements such as IGBT (Insulated Gate Bipolar Transistor), for example.
- the two switching elements Q1, Q2 are connected in series.
- Diodes D1 and D2 are free-wheeling diodes connected in antiparallel to switching elements Q1 and Q2, respectively.
- a capacitor C as an energy storage element is connected in parallel with the switching elements Q1 and Q2 connected in series.
- the cell terminal E1 drawn from one end of the switching element Q2 is connected to the cell terminal E1 of the cell L adjacent to the positive electrode side.
- the cell terminal E2 drawn from the other end of the switching element Q2 is connected to the cell terminal E1 of the cell L adjacent to the negative electrode side.
- a bypass switch SW is connected to both ends of the switching element Q2.
- the bypass switch SW is connected between the cell terminals E1 and E2.
- the bypass switch SW is a switch configured to be able to short-circuit the switching element Q2 (both ends thereof) by closing the contact point, and can be supplied with an accident current. That is, the bypass switch SW short-circuits the cell L, thereby protecting each element included in the cell L (switching elements Q1, Q2, diodes D1, D2, and capacitor C) from an overcurrent that occurs in the event of an accident.
- the current detector 51 is provided between the DC terminals 41n to 43n and the circuit breaker 12.
- the current detector 51 detects the current flowing through the DC terminals 41n to 43n and inputs the current value Ia of the current to the control device 100.
- a DC current transformer (DCCT), a Hall current detector (HCT), or the like that can detect a current value together with a DC component is used.
- the DC voltage detector 52 is provided between the DC terminals 41p to 43p and the main line 9.
- the DC voltage detector 52 detects a DC voltage applied to the main line 9 and inputs the DC voltage value Va to the control device 100.
- Control device 100 executes various processes based on the input current value and voltage value. Specifically, the control device 100 performs accident determination on the main line 9, operation stop and return control of the AC / DC converter 20, switching control of the AC circuit breaker 3, switching control of the circuit breaker 12, and the like. The specific processing content of the control device 100 will be described later.
- control device 100 is configured mainly with a microcomputer, and includes a CPU (Central Processing Unit) (not shown), such as a ROM (Read Only Memory) and a RAM (Random Access Memory) (not shown). This is realized by executing data and programs stored in the memory.
- control device 100 may be configured with hardware such as a circuit for realizing processing based on an instruction executed by the CPU.
- FIG. 4 is a diagram showing the flow of the accident current in the first phase immediately after the occurrence of the accident on the main line 9.
- FIG. 5 is a diagram illustrating a flow of an accident current in a second phase after the first phase illustrated in FIG.
- FIG. 6 is a diagram showing a flow of an accident current in a third aspect after the second aspect shown in FIG.
- FIG. 7 is a diagram illustrating an accident current flow in a fourth aspect after the third aspect illustrated in FIG. 6.
- phase module included in the AC / DC converters of the power converters 5 and 5A is illustrated to explain the flow of the fault current. In each phase module, the way the fault current flows is the same.
- the fault current flows from power converters 5 and 5B in the direction of the fault point (main line 9) as indicated by arrow AR1. Go. Further, the accident current flows from the power converters 5A and 5C in the direction of the accident point as indicated by the arrow AR2.
- the power converters 5 and 5B detect the accident current and execute the following processing.
- each switching element is in switching operation. Therefore, as shown in FIG. 4, for example, in each cell L, an accident current flows through the capacitor C and the switching element in the conductive state (in the example of FIG. 4, the switching element Q1).
- each cell L is stopped.
- the stop of the cell L means that no voltage is output from the cell L, for example, by turning off the switching elements Q1 and Q2 (so that they cannot be turned on).
- the fault current continues to flow in the direction of the fault point via the diode D2, as indicated by arrows AR3 and AR4 in FIG.
- the power converters 5 and 5A turn on (close) the bypass switches SW connected to the respective cells L. Then, as indicated by arrows AR5 and AR6 in FIG. 6, the fault current flows in the direction of the fault point via the bypass switch SW connected to the cell L. Thereby, since each cell L is short-circuited, destruction of switching element Q1, Q2, diode D1, D2, and the capacitor
- power converters 5 and 5A open AC circuit breakers 3 and 3A, respectively. Thereby, the alternating current which flows into power converters 5 and 5A from AC system 2 and 2A, respectively is intercepted. After AC circuit breakers 3 and 3A are opened, power converters 5 and 5A open circuit breakers 12 and 12A, respectively. Thereby, the electric current which flows into the 1st pole from the 2nd pole which is a healthy pole is intercepted. That is, the first pole and the second pole are completely separated, and the operation can be continued on the second pole side where no accident has occurred.
- the AC / DC converter is processed in the order of gate block (switching element off), bypass switch SW, AC circuit breaker 3 open, and circuit breaker 12 open. This is to prevent the adverse effect on the DC power transmission system due to the opening of the AC circuit breaker 3 and the circuit breaker 12 during the operation of the AC / DC converter, and to more quickly remove the influence of the accident current on the device itself. is there.
- the time T1 from when the closing command is output to the bypass switch SW to when the bypass switch SW is switched on is from the time when the opening command is output to the circuit breaker 12 (or the AC circuit breaker 3). It is shorter than the time T2 until the circuit breaker 12 (or the AC circuit breaker 3) is opened. Needless to say, the time T3 from when the gate block command is output until the switching element is turned off is overwhelmingly shorter than the time T1 and the time T2.
- the AC circuit breakers 3, 3 ⁇ / b> A and the circuit breakers 12, 12 ⁇ / b> A are opened, so that no current flows through the power converters 5, 5 ⁇ / b> A. Therefore, when a predetermined time has elapsed after the circuit breakers 12 and 12A are opened, the power converters 5 and 5A try to recover from the accident.
- the power converters 5 and 5A open the bypass switch SW that is turned on for protection of each element of the cell L. Thereby, each AC / DC converter of power converters 5 and 5A will be in a state which can be restarted (namely, state which can output a voltage from cell L by suitable switching operation).
- the power converters 5 and 5A turn on the AC breakers 3 and 3A after turning on the breakers 12 and 12A. Then, the power converters 5 and 5A restart the operation of each cell L.
- the power converters 5 and 5A can turn on the AC / DC converter from the gate block state (the switching elements Q1 and Q2 of each cell L are turned off) to the deblocked state (the switching elements Q1 and Q2 of each cell L are turned on). The voltage from each cell L is output.
- the DC accident can be quickly eliminated by preventing the inflow of the accident current from the pole where the accident has not occurred (healthy pole) to the pole where the accident has occurred (accident pole). be able to.
- the influence of the accident current on the AC / DC converter can be minimized.
- the bypass switch SW which is a protection circuit in the AC / DC converter of the accident pole can be opened by preventing the accident current from flowing from the healthy pole to the accident pole. Therefore, the AC / DC converter of the accident pole can be restarted promptly.
- control device 100 the functional configuration of the control device 100 of the power conversion device 5 will be described.
- the functional configuration of the control devices of the other power converters 5A to 5C is the same as the functional configuration of the control device 100.
- FIG. 8 is a functional block diagram of the control device 100 of the power conversion device 5.
- control device 100 includes a current input unit 110, a voltage input unit 112, an accident determination unit 120, a converter control unit 130, and a switch control unit 140.
- Each of these functions is realized by the CPU of the control device 100 executing a program stored in the ROM. Note that some or all of these functions may be implemented by hardware.
- the current input unit 110 receives an input of a current value Ia of a DC current flowing between the DC terminals 41n to 43n on the neutral point 13 (neutral wire 11) side and the neutral point. Specifically, the current input unit 110 receives an input of the current value Ia from the current detector 51.
- the voltage input unit 112 receives an input of the voltage value Va of the main line 9. Specifically, the voltage input unit 112 receives an input of the DC voltage value Va from the DC voltage detector 52.
- the accident determination unit 120 determines whether or not an accident has occurred on the main line 9 based on the current value Ia (including positive / negative distinction) received by the current input unit 110 and a predetermined reference current threshold Is. to decide. Specifically, the accident determination unit 120 determines that an accident has occurred on the main line 9 when the current value Ia is greater than or equal to the reference current threshold Is. Typically, when an accident occurs on the main line 9, a current flows from the power converter 5 to the main line 9 side. Therefore, when this current direction is the positive direction, the accident determination unit 120 can determine that an accident has occurred on the main line 9 if the current value Ia is equal to or greater than the reference current threshold Is (> 0).
- the DC voltage value Va (including positive / negative distinction) of the main line 9 may be used.
- the accident determination unit 120 determines that the main line 9 when the current value Ia is equal to or greater than the reference current threshold Is and the DC voltage value Va is equal to or less than the reference voltage threshold Vs (generally 0 V). It may be configured to determine that an accident has occurred. This utilizes the fact that the DC voltage value Va of the main line 9 becomes almost 0 V when an accident occurs.
- the DC voltage value Va of the main line 9 is a positive DC voltage
- the DC voltage value of the main line 10 is a negative DC voltage
- the neutral line 11 is approximately 0V.
- the reference current threshold Is and the reference voltage threshold Vs are stored in advance in a memory (ROM or RAM) of the control device 100.
- the converter control unit 130 controls the operation of the AC / DC converter 20. Specifically, the converter control unit 130 switches the two switching elements Q1 and Q2 (on / off at a predetermined timing) by transmitting a gate signal to each of the cells L1 to L12. The cells L1 to L12 are driven.
- the converter control unit 130 may be configured to transmit a gate signal to each of the cells L1 to L12 through an individual transmission path, or may be configured to transmit to all the cells L1 to L12 through a common transmission path. May be.
- the converter control unit 130 When the current value Ia is greater than or equal to the reference current threshold Is (ie, when the accident determination unit 120 determines that an accident has occurred), the converter control unit 130 removes each cell L1 ⁇ After stopping L12, the bypass switch SW (each bypass switch SW) connected to each cell L1 to L12 is turned on (closed). Specifically, converter control unit 130 transmits a gate block command to each of cells L1 to L12 to turn off switching elements Q1 and Q2 of each of cells L1 to L12, and then issues a turn-on command to each bypass switch. Send to SW.
- the switch control unit 140 controls the switching of the circuit breaker 12 and the switching of the AC circuit breaker 3.
- the switch control unit 140 opens the circuit breaker 12 (sends a trip command to the circuit breaker 12) in order to eliminate the accident.
- the switch control unit 140 opens the AC circuit breaker 3 and then opens the circuit breaker 12 after each bypass switch SW is turned on.
- the converter control unit 130 may detect each bypass switch SW after a predetermined time elapses after the circuit breaker 12 is opened (a trip command is transmitted to the circuit breaker 12). Is released. The converter control unit 130 may open each bypass switch SW after confirming that no current flows through the AC / DC converter 20. Specifically, the converter control unit 130 determines that the current value Ia is equal to or less than the reference current threshold Ik (that is, approximately 0 A) after a predetermined time has elapsed since the circuit breaker 12 opened. The configuration may be such that each bypass switch SW is opened.
- the switch control unit 140 turns on the AC circuit breaker 3 after turning on the breaker 12 (transmitting a turn-on command to the breaker 12) after each bypass switch SW is opened.
- Converter control unit 130 operates each of cells L1 to L12 after circuit breaker 12 (and AC circuit breaker 3) is turned on. Specifically, the converter control unit 130 generates a gate signal for causing the cells L1 to L12 to output the same voltage value and frequency as before the occurrence of the accident, and sends the gate signal to each of the cells L1 to L12. Send.
- FIG. 9 is a flowchart illustrating a processing procedure of the control device 100. Typically, the following steps are realized by the CPU of the control device 100 executing a program stored in the ROM. It is assumed that the control device 100 constantly monitors the current value input from the current detector 51 and the DC voltage value input from the DC voltage detector 52.
- control device 100 determines whether or not current value Ia is greater than or equal to reference current threshold Is (step S12). If current value Ia is less than reference current threshold Is (NO in step S12), control device 100 ends the process. On the other hand, when current value Ia is equal to or greater than reference current threshold Is (YES in step S12), control device 100 determines whether or not DC voltage value Va is equal to or less than reference voltage threshold Vs (step S13). When DC voltage value Va is larger than reference voltage threshold value Vs (NO in step S13), control device 100 ends the process.
- control device 100 When DC voltage value Va is equal to or lower than reference voltage threshold value Vs (YES in step S13), control device 100 gates AC / DC converter 20 (switching elements Q1 and Q2 of cells L1 to L12 are turned off). (Step S14), each bypass switch SW is turned on (Step S16). By the processing in step S14 and step S16, it is possible to prevent destruction of each element of each cell L1 to L12 due to an accident current.
- the control device 100 transmits a trip signal to the AC circuit breaker 3 to open the AC circuit breaker 3 (step S18), and transmits a trip signal to the circuit breaker 12 to open the circuit breaker 12 (step S20). ). Due to the processing in step S18 and step S20, no current flows through the AC / DC converter 20, so that preparations for restart are made. In general, since the circuit breaker 12 is mounted on a DC circuit, it is preferable to suppress the current flowing through the circuit breaker 12. Therefore, the control device 100 opens the circuit breaker 12 after blocking the flow of current from the AC system 2 by opening the AC circuit breaker 3.
- the circuit breaker 12 has a function equivalent to MRTB (Metallic Transfer Breaker).
- the control device 100 determines whether or not a predetermined time has elapsed since the circuit breaker 12 was opened (step S22). If the predetermined time has not elapsed (NO in step S22), control device 100 repeats the process of step S22. When the predetermined time has elapsed (YES in step S22), control device 100 determines whether or not current value Ia is equal to or smaller than reference current threshold Ik (step S23). When current value Ia is larger than reference current threshold Ik (NO in step S23), control device 100 repeats the processing from step S22. When current value Ia is equal to or smaller than reference current threshold value Ik (YES in step S23), control device 100 opens each bypass switch SW (step S24). The control device 100 turns on the circuit breaker 12 (step S26) and turns on the AC circuit breaker 3 (step S28).
- the reason why the AC circuit breaker 3 is turned on after the circuit breaker 12 is turned on is to suppress an impact caused by a voltage difference with respect to the AC / DC converter 20 and the DC circuit. Specifically, when the AC circuit breaker 3 is turned on before the circuit breaker 12 is turned on, charging of the capacitor in the AC / DC converter 20 starts. Therefore, in this case, the DC circuit is configured with the capacitor charged, and the impact due to the voltage difference on the AC / DC converter 20 and the DC circuit is greater than when the DC circuit is configured before charging the capacitor. End up. Therefore, the control device 100 turns on the AC breaker 3 after turning on the breaker 12 in order to suppress the impact due to the voltage difference. Next, the control device 100 deblocks the AC / DC converter 20 (step S30) and ends the process.
- the control device 100 may simultaneously issue a gate block command (step S14), a closing command to each bypass switch SW (step S16), and an opening command to the AC circuit breaker 3 (step S18). Even in this case, the AC circuit breaker 3 is opened after the switching element is turned off and each bypass switch SW is turned on.
- FIG. 10 is a diagram for explaining the configuration of the power conversion device 6 and the protection control device 7 according to the modification.
- the structure of the power converter device 6 replaces the control apparatus 100 of the power converter apparatus 5 with the control apparatus 100A.
- the configuration of the power conversion device 6 detailed description of the same portions as the configuration of the power conversion device 5 will not be repeated.
- the control device 100A includes a communication interface for communicating with the protection control device 7, and can exchange various information with the protection control device 7 via the communication interface.
- the control device 100 ⁇ / b> A determines the accident on the main line 9 Operation stop and return control of the converter 20 are performed. Specific processing contents of the control device 100A will be described later.
- the protection control device 7 controls the switching of the AC circuit breaker 3 based on the information received from the control device 100A, the current value Ia input from the current detector 51 and the DC voltage value Va input from the DC voltage detector 52. , And open / close control of the circuit breaker 12. The specific processing contents of the protection control device 7 will be described later.
- FIG. 11 is a functional block diagram of the control device 100A of the power conversion device 6 and the protection control device 7.
- control device 100A includes a current input unit 110A, a voltage input unit 112A, an accident determination unit 120A, a converter control unit 130A, and an information communication unit 150A.
- the protection control device 7 includes a current input unit 210, a voltage input unit 212, an accident determination unit 220, a switch control unit 240, and an information communication unit 250.
- the current input unit 110A, voltage input unit 112A, and accident determination unit 120A of the control device 100A are the same as the current input unit 110, voltage input unit 112, and accident determination unit 120 in FIG.
- the converter control unit 130 ⁇ / b> A controls the operation of the AC / DC converter 20.
- 150 A of information communication parts receive the switching information which shows the switching state of the AC circuit breaker 3, and the switching information which shows the switching state of the circuit breaker 12 from the protection control apparatus 7.
- converter control unit 130A stops cells L1 to L12 when current value Ia is equal to or greater than reference current threshold Is (and when DC voltage value Va is equal to or less than reference voltage threshold Vs). After that, the bypass switch SW is turned on.
- the converter control unit 130A after the information communication unit 150A receives information (opening information) indicating that the circuit breaker 12 (and the AC circuit breaker 3) is in the open state, Each bypass switch SW is opened.
- the converter control unit 130 ⁇ / b> A may open each bypass switch SW after confirming that no current flows through the AC / DC converter 20. Further, the converter control unit 130A receives information (input information) indicating that the circuit breaker 12 (and the AC circuit breaker 3) is in the closed (closed) state by the information communication unit 150A, and each cell L1 Operate L12.
- the information communication unit 150A may transmit the opening / closing information of the bypass switch SW to the protection control device 7. Further, the information communication unit 150A includes the gate block state of the AC / DC converter 20 (the switching elements Q1 and Q2 of the cells L1 to L12 are off) and the deblock state of the AC / DC converter 20 (the switching of the cells L1 to L12). Switching state information indicating a state in which the elements Q1 and Q2 cannot be turned on) may be transmitted to the protection control device 7.
- the current input unit 210 of the protection control device 7 receives the input of the current value Ia from the current detector 51.
- the voltage input unit 212 receives an input of the DC voltage value Va from the DC voltage detector 52.
- the accident determination unit 220 determines whether an accident has occurred on the main line 9 based on the current value Ia and the reference current threshold Is (and the DC voltage value Va and the reference voltage threshold Vs).
- the switch control unit 240 controls the switching of the circuit breaker 12 and the switching of the AC circuit breaker 3.
- the information communication unit 250 receives opening / closing information (and switching state information) of the bypass switch SW from the control device 100A.
- the switch control unit 240 opens the AC circuit breaker 3 and then opens the circuit breaker 12 to remove the accident.
- the switch control unit 240 switches on the AC circuit after turning on the circuit breaker 12. The container 3 is turned on.
- FIG. 12 is a flowchart showing a processing procedure of the control device 100A. Typically, the following steps are realized by the CPU of the control device 100A executing a program stored in the ROM. Note that the control device 100A is constantly monitoring the current value Ia input from the current detector 51 and the DC voltage value Va input from the DC voltage detector 52.
- steps S52 to S56 is the same as the processing in steps S12 to S16 in FIG. 9, and therefore detailed description thereof will not be repeated.
- Control device 100A determines whether or not open information indicating that AC circuit breaker 3 and circuit breaker 12 are in the open state has been received (step S58). If release information has not been received (NO in step S58), control device 100A repeats the process in step S58.
- opening information YES in step S58
- control device 100A determines whether or not a predetermined time has elapsed since receiving the opening information (step S60). If the predetermined time has not elapsed (NO in step S60), control device 100A repeats the process of step S60. When the predetermined time has elapsed (YES in step S60), control device 100 determines whether or not current value Ia is equal to or smaller than reference current threshold Ik (step S61).
- control device 100 When current value Ia is larger than reference current threshold Ik (NO in step S61), control device 100 repeats the processing from step S60. When current value Ia is equal to or smaller than reference current threshold Ik (YES in step S61), control device 100A opens each bypass switch SW (step S62).
- the control device 100A determines whether or not the closing information indicating that the AC breaker 3 and the breaker 12 are turned on has been received (step S64). If the input information has not been received (NO in step S64), control device 100A repeats the process of step S64. When the insertion information is received (YES in step S64), control device 100A deblocks AC / DC converter 20 (step S66), and ends the process.
- the structure which applies a power converter device to a bipolar direct current power transmission system was demonstrated, it is not restricted to the said structure.
- the power conversion device 5 can be applied to a DC transmission system having a three-pole configuration as shown in FIG.
- FIG. 13 is a diagram illustrating an example of a three-pole DC power transmission system to which the power conversion device is applied.
- the DC transmission system is a three-pole DC transmission system (three-pole DC transmission system) composed of three poles of main lines 9, 10, 15 and neutral line 11.
- the first pole is composed of the power converters 5 and 5A, the main line 9 and the neutral line 11.
- the second pole is composed of the power converters 5B and 5C, the main line 10 and the neutral line 11.
- the third pole is composed of the power conversion devices 5D and 5E, the main line 15 and the neutral line 11. The first pole, the second pole, and the third pole share the neutral wire 11.
- the power converters 5D and 5E are connected to the main line 15 and to the neutral line 11 via the circuit breakers 12D and 12E, respectively.
- Power converters 5D and 5E are connected to AC buses 1 and 1A via transformers 4D and 4E and AC circuit breakers 3D and 3E, respectively.
- One of the first to third poles is used as a spare pole. For example, it is assumed that a ground fault has occurred on the main line 9 of the first pole when direct current power transmission is performed on the first pole and the second pole. In this case, until the 1st pole returns from the accident, the 3rd pole is used instead of the 1st pole, and direct current power transmission is performed with a bipolar DC transmission system composed of the 2nd pole and the 3rd pole. Can do.
- the AC circuit breakers 3D and 3E and the circuit breakers 12D and 12E are open. And when using a 3rd pole, AC circuit breakers 3D and 3E and circuit breakers 12D and 12E are made into an ON state, respectively.
- the power conversion device 5D and 5E receive information indicating that the first pole is disconnected from the second pole.
- Power converters 5D and 5E operate AC / DC converters with AC circuit breakers 3D and 3E and circuit breakers 12D and 12E turned on, respectively.
- the configuration in which the current detector 51 is provided between the DC terminals 41n to 43n and the circuit breaker 12 in FIG. 2 has been described, but the configuration is not limited thereto.
- the structure which provides the current detector 51 for every phase may be sufficient.
- the three current detectors 51 are provided between the cell L4 and the DC terminal 41n, between the cell L8 and the DC terminal 42n, and between the cell L12 and the DC terminal 43n, respectively.
- the circuit breaker 12 may be provided for each phase.
- the current detector 51 may be configured to be provided between the DC terminals 41p to 43p on the main line 9 side and the main line 9.
- the control device 100 receives an input of a current value of a DC current flowing between the DC terminals 41p to 43p on the main line 9 side and the main line 9.
- the first pole power converters 5 and 5A are configured to be able to transmit and receive information to and from each other via a host device (such as a pole control device) for controlling the operation of the first pole. Also good.
- the pole control device receives the switching information of the circuit breaker and the AC circuit breaker from one power conversion device, and transmits the switching information to the other power conversion device.
- the host device may be a bipolar control device that controls the operations of the first pole and the second pole.
- an AC current detector may be provided between the transformer 4 and the AC / DC converter 20.
- the alternating current detector detects an alternating current flowing between the transformer 4 and the AC / DC converter 20 and inputs the current value of the alternating current to the control device 100.
- control device 100 interrupts AC circuit breaker 3 when the current value is equal to or greater than a predetermined AC threshold value.
- the AC / DC converter 20 has been described with respect to the configuration having three phase modules, but the configuration is not limited thereto.
- the AC / DC converter 20 may have at least one phase module.
- the configuration in which the plurality of cells L are bypassed (short-circuited) by providing the bypass switch SW in each of the plurality of cells L has been described.
- a configuration in which at least one bypass switch SW is provided (connected) to the plurality of cells L may be employed.
- the configuration may be such that the entire upper arm is bypassed by providing one bypass switch SW for a plurality of cells L (cells L1, L2, etc.) corresponding to the upper arm.
- the structure which bypasses the whole lower arm by providing one bypass switch SW with respect to the some cell L (cell L3, L4 etc.) corresponding to a lower arm may be sufficient.
- bypass switch SW for short-circuiting the three cells L and a bypass switch SW for short-circuiting the two cells L are provided. It may be a configuration. That is, as long as the entire plurality of cells L can be bypassed, the number of bypass switches SW is not limited.
- each of the AC terminals 31 to 33 may be configured as a secondary winding for each phase.
- the AC / DC converter 20 receives the AC power output from the primary winding of each phase that is the AC terminal of the transformer 4 via the secondary winding of each phase that is the AC terminals 31 to 33. It may be configured to capture.
- the configuration illustrated as the above-described embodiment is an example of the configuration of the present invention, and can be combined with another known technique, and a part of the configuration is omitted without departing from the gist of the present invention. It is also possible to change the configuration.
- the accident can be promptly removed by preventing the accident current from flowing from the healthy pole where the accident has not occurred to the accident pole where the accident has occurred.
- the time during which the fault current flows to the AC / DC converter can be shortened to minimize the adverse effects on the AC / DC converter.
- the bypass switch SW in the AC / DC converter of the accident pole can be opened by preventing the accident current from flowing from the healthy pole to the accident pole. Therefore, the AC / DC converter of the accident pole can be restarted promptly.
- the AC / DC converter can be protected while quickly removing the accident by appropriately performing the operation and stop control of the AC / DC converter and the opening / closing of the circuit breaker. Therefore, it is not necessary to use an expensive circuit breaker that is fast and can reduce the cost of the entire system.
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Abstract
Description
図1は、直流送電システムの全体構成の一例を示す図である。図1を参照して、直流送電システムは、2つの極の直流送電線(本線)9,10と中性線11から構成される双極構成の直流送電系統(双極直流送電系統)である。双極直流送電系統は、正負2極に区分された2つの直流送電系統の中性点13,13Aを1本の中性線11で接続して形成されている。本線9,10を介して2つの交流系統2,2A間で電力が送受される。
図2は、電力変換装置の構成を説明するための図である。以下では、説明の便宜上、電力変換装置5の構成について説明する。なお、電力変換装置5A~5Cの構成は、電力変換装置5の構成と同じである。
次に、図4~図7を参照しながら、上述したような構成を有する双極直流送電システムの動作概要について説明する。
次に、電力変換装置5の制御機器100の機能構成について説明する。なお、他の電力変換装置5A~5Cの制御機器の機能構成は、制御機器100の機能構成と同じである。
図9は、制御機器100の処理手順を示すフローチャートである。典型的には、以下の各ステップは、制御機器100のCPUがROMに格納されたプログラムを実行することによって実現される。なお、制御機器100は、常時、電流検出器51から入力される電流値と直流電圧検出器52から入力される直流電圧値とを監視しているものとする。
上記では、電力変換装置5の制御機器100が、交直変換器20と、交流遮断器3および遮断器12とを制御する構成について説明した。変形例では、電力変換装置の制御機器が交直変換器20を制御し、保護制御装置が交流遮断器3および遮断器12とを制御する構成について説明する。
上記では、双極直流送電系統に電力変換装置を適用する構成について説明したが、当該構成に限られない。たとえば、図13に示すような3極構成の直流送電系統にも電力変換装置5を適用することができる。
上述した実施の形態では、図1などにおいて、中性点13,13Aを1本の中性線11で接続して、第1極と第2極とで中性線11を共用する構成について説明したが、極ごとに中性線を用いる(すなわち、2本の中性線を用いる)構成であってもよい。また、中性点13,13Aを中性線11で接続せずに、各中性点13,13Aを接地して、大地を帰線とする大地帰路方式を用いる構成であってもよい。
上述した実施の形態によると、事故が発生してない健全極から事故が発生した事故極への事故電流の流入を防ぐことにより、事故を速やかに除去することができる。また、事故電流が交直変換器に流れる時間を短くして当該交直変換器への悪影響を最小限にとどめることができる。さらに、交直変換器内の故障だけでなく本線での事故による事故電流の流入を防ぐことができる。
Claims (8)
- 少なくとも2つの本線を有する多極構成の直流送電系統に用いられる電力変換装置であって、
交流系統と前記本線との間で電力を変換する交直変換器と、
制御機器とを備え、
前記交直変換器は、
少なくとも1つの相モジュールを含み、
前記相モジュールは、交流端子と、前記本線側の直流端子と、中性点側の直流端子と、前記本線側の直流端子と前記交流端子との間に設けられる第1アームと、前記中性点側の直流端子と前記交流端子との間に設けられる第2アームとを有し、
前記第1アームおよび前記第2アームの各々は、直列接続された複数のセルを有し、
前記複数のセルの各々は、スイッチング素子と、前記スイッチング素子に並列接続されるダイオードおよびコンデンサとを有し、
前記複数のセルには、当該複数のセルを短絡するための少なくとも1つのバイパススイッチが接続されており、
前記制御機器は、
前記中性点側の直流端子と前記中性点との間の電流値または前記本線側の直流端子と前記本線との間の電流値の入力を受け付ける電流入力部と、
前記交直変換器の動作を制御する変換器制御部と、
前記中性点側の直流端子と前記中性点との間に設けられた第1の開閉器の開閉を制御可能な開閉器制御部とを含み、
前記変換器制御部は、前記電流値が予め定められた閾値以上である場合に、前記複数のセルを停止した後、前記バイパススイッチを投入し、
前記開閉器制御部は、前記電流値が予め定められた閾値以上である場合に、前記第1の開閉器を開放する、電力変換装置。 - 前記開閉器制御部は、前記バイパススイッチが投入された後、前記第1の開閉器を開放する、請求項1に記載の電力変換装置。
- 前記変換器制御部は、前記第1の開閉器が開放してから予め定められた時間が経過した後、前記バイパススイッチを開放し、
前記開閉器制御部は、前記バイパススイッチが開放された後、前記第1の開閉器を投入し、
前記変換器制御部は、前記第1の開閉器が投入された後、前記セルを動作させる、請求項1または請求項2に記載の電力変換装置。 - 前記開閉器制御部は、前記交流端子と前記交流系統との間に設けられた第2の開閉器の開閉をさらに制御可能であり、
前記開閉器制御部は、前記電流値が予め定められた閾値以上である場合に、前記第2の開閉器を開放した後、前記第1の開閉器を開放する、請求項1~請求項3のいずれか1項に記載の電力変換装置。 - 前記直流送電系統は、2つの本線を有する双極構成の直流送電系統、または3つの本線を有する三極構成の直流送電系統を含む、請求項1~請求項4のいずれか1項に記載の電力変換装置。
- 少なくとも2つの本線を有する多極構成の直流送電系統に用いられる電力変換装置であって、
交流系統と前記本線との間で電力を変換する交直変換器と、
制御機器とを備え、
前記交直変換器は、
少なくとも1つの相モジュールを含み、
前記相モジュールは、交流端子と、前記本線側の直流端子と、中性点側の直流端子と、前記本線側の直流端子と前記交流端子との間に設けられる第1アームと、前記中性点側の直流端子と前記交流端子との間に設けられる第2アームとを有し、
前記第1アームおよび前記第2アームの各々は、直列接続された複数のセルを有し、
前記複数のセルの各々は、スイッチング素子と、前記スイッチング素子に並列接続されるダイオードおよびコンデンサとを有し、
前記複数のセルには、当該複数のセルを短絡するための少なくとも1つのバイパススイッチが接続されており、
前記制御機器は、
前記中性点側の直流端子と前記中性点との間の電流値または前記本線側の直流端子と前記本線との間の電流値の入力を受け付ける電流入力部と、
前記交直変換器の動作を制御する変換器制御部と、
前記中性点側の直流端子と前記中性点との間に設けられた開閉器の開閉状態を示す情報を受信する情報通信部とを含み、
前記変換器制御部は、前記電流値が予め定められた閾値以上である場合に、前記セルを停止した後、前記バイパススイッチを投入し、
前記変換器制御部は、前記情報通信部により前記開閉器が開放状態であることを示す情報が受信されてから予め定められた時間が経過した後、前記バイパススイッチを開放する、電力変換装置。 - 少なくとも2つの本線を有する多極構成の直流送電システムであって、
交流系統と前記本線との間で電力を変換する電力変換装置を備え、
前記電力変換装置は、
交流系統と前記本線との間で電力を変換する交直変換器と、
制御機器とを含み、
前記交直変換器は、
少なくとも1つの相モジュールを有し、
前記相モジュールは、交流端子と、前記本線側の直流端子と、中性点側の直流端子と、前記本線側の直流端子と前記交流端子との間に設けられる第1アームと、前記中性点側の直流端子と前記交流端子との間に設けられる第2アームとを有し、
前記第1アームおよび前記第2アームの各々は、直列接続された複数のセルを有し、
前記複数のセルの各々は、スイッチング素子と、前記スイッチング素子に並列接続されるダイオードおよびコンデンサとを有し、
前記複数のセルには、当該複数のセルを短絡するための少なくとも1つのバイパススイッチが接続されており、
前記中性点側の直流端子と前記中性点との間に設けられた開閉器の開閉を制御する保護制御装置をさらに備え、
前記制御機器は、
前記中性点側の直流端子と前記中性点との間の電流値または前記本線側の直流端子と前記本線との間の電流値の入力を受け付ける電流入力部と、
前記交直変換器の動作を制御する変換器制御部と、
前記開閉器の開閉状態を示す情報を前記保護制御装置から受信する情報通信部とを含み、
前記変換器制御部は、前記電流値が予め定められた閾値以上である場合に、前記セルを停止した後、前記バイパススイッチを投入し、
前記変換器制御部は、前記情報通信部により前記開閉器が開放状態であることを示す情報が受信されてから予め定められた時間が経過した後、前記バイパススイッチを開放する、直流送電システム。 - 少なくとも2つの本線を有する多極構成の直流送電系統に用いられる電力変換装置であって、
交流系統と前記本線との間で電力を変換する交直変換器と、
制御機器とを備え、
前記交直変換器は、
少なくとも1つの相モジュールを含み、
前記相モジュールは、交流端子と、前記本線側の直流端子と、中性点側の直流端子と、前記本線側の直流端子と前記交流端子との間に設けられる第1アームと、前記中性点側の直流端子と前記交流端子との間に設けられる第2アームとを有し、
前記第1アームおよび前記第2アームの各々は、直列接続された複数のセルを有し、
前記複数のセルの各々は、スイッチング素子と、前記スイッチング素子に並列接続されるダイオードおよびコンデンサとを有し、
前記複数のセルには、当該複数のセルを短絡するための少なくとも1つのバイパススイッチが接続されており、
前記制御機器は、
前記本線で事故が発生したか否かを判断する事故判断部を含み、前記事故判断部が前記本線で事故が発生したと判断した場合に、前記バイパススイッチの投入後に、前記中性点側の直流端子と前記中性点との間に設けられた開閉器が開放されるように、前記バイパススイッチおよび前記開閉器を制御する、電力変換装置。
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