WO2020233180A1 - Parafoudre pouvant être commandé limiteur de courant, convertisseur, système de transmission de puissance et procédé de commande - Google Patents

Parafoudre pouvant être commandé limiteur de courant, convertisseur, système de transmission de puissance et procédé de commande Download PDF

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Publication number
WO2020233180A1
WO2020233180A1 PCT/CN2020/076028 CN2020076028W WO2020233180A1 WO 2020233180 A1 WO2020233180 A1 WO 2020233180A1 CN 2020076028 W CN2020076028 W CN 2020076028W WO 2020233180 A1 WO2020233180 A1 WO 2020233180A1
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WIPO (PCT)
Prior art keywords
current
arrester
limiting
bypass switch
bypass
Prior art date
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PCT/CN2020/076028
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English (en)
Chinese (zh)
Inventor
谢晔源
王宇
姜田贵
卢宇
李海英
Original Assignee
南京南瑞继保电气有限公司
南京南瑞继保工程技术有限公司
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Publication of WO2020233180A1 publication Critical patent/WO2020233180A1/fr

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
    • H02H9/04—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/08—Locating faults in cables, transmission lines, or networks
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/08—Locating faults in cables, transmission lines, or networks
    • G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
    • G01R31/085—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution lines, e.g. overhead
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/08—Locating faults in cables, transmission lines, or networks
    • G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
    • G01R31/086—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution networks, i.e. with interconnected conductors
    • 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
    • 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
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
    • H02H9/02—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess current
    • 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
    • H02M7/219—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 in a bridge configuration

Definitions

  • This application relates to the field of power electronics applications, in particular to current-limiting controllable lightning arresters, inverters, power transmission systems and control methods.
  • the flexible DC transmission system adopts modular multi-level converters, which has many advantages such as low requirements for the consistent triggering of dynamic voltage equalization, good scalability, high output voltage waveform quality, low switching frequency, and low operating loss. But its shortcomings are also very obvious. Once a line short-circuit fault occurs, it will quickly affect the DC transmission network and the AC network, and the fault cannot be removed by stopping the converter. Especially for a single-pole DC transmission system, after a single-phase grounding fault occurs, there is no flow path for the fault current, and it is difficult to determine the location of the fault point based on the fault current.
  • Patent 201310370589.X proposes a multi-terminal flexible DC transmission system and a fault control method. It proposes the use of a nonlinear resistance method to limit the voltage to the ground of the non-grounding electrode when a single-phase ground fault occurs. This is only for protection Means, and the operating voltage of the non-linear resistor is fixed, and the accuracy is not high. If the value is too small, it may cause malfunctions, and frequent malfunctions will affect the life of the equipment; if the operating voltage is too large, such as 1.8 times the rated value, after the non-linear resistance operates, the voltage is still too high, and the equipment insulation will also suffer At this time, the fault current is still not obvious, and there are many problems in actual engineering applications.
  • the patent 201710862244.4 is an overvoltage protection circuit and method for a DC circuit breaker.
  • the patent uses a controllable arrester, which is arranged near the DC switch to limit the overvoltage caused by the breaking of the DC switch.
  • the converter can withstand long-term overcurrent during the DC switch breaking process, which is likely to cause equipment damage.
  • the bypass switch is directly closed, which will generate an instantaneous overvoltage at both ends of the fixed part of the controllable arrester, thereby generating a relatively large inrush current.
  • the design capacity of the arrester is increased, and the cost is greatly increased.
  • the embodiment of the present application provides a current-limiting controllable arrester, which includes a first arrester and a variable arrester connected in series, the variable arrester includes a second arrester and a bypass branch connected in parallel, the bypass The branch includes a first bypass switch.
  • the bypass branch further includes a first current limiting unit connected in series with the first bypass switch, and the first current limiting unit includes a second bypass switch and a current limiting device connected in parallel ,
  • the current limiting device includes a resistor, an inductor or a combination of resistor and inductor.
  • the bypass branch further includes a second current limiting unit connected in series with the first bypass switch, and the second current limiting unit includes an energy storage element, a bridge
  • the DC side of the bridge circuit is connected to the energy storage element, and the bridge circuit implements AC/DC conversion; the primary side of the isolation transformer is led out as the connection port of the second current limiting unit ,
  • the secondary side of the isolation transformer is connected to the AC side of the bridge circuit.
  • the first bypass switch and the second bypass switch include solid-state switches or fast mechanical switches composed of power semiconductor devices.
  • the operating voltage of the first arrester is greater than the DC side output rated voltage to ground.
  • the embodiment of the present application also provides a converter.
  • the converter includes an AC-DC converter and two current-limiting controllable arresters as described above.
  • the AC-DC converter converts AC to DC, and the lead-out They are respectively defined as DC side output positive and DC output negative; one end of the two current-limiting controllable arresters is respectively connected to the DC side output positive and DC output negative, and the other end is grounded.
  • the converter further includes a controller and two voltage transformers, which respectively detect the ground voltage of the DC side output positive and the DC output negative, and the obtained voltage signals are sent to the controller.
  • the AC-DC converter includes three-phase six-bridge arms, and each bridge arm includes at least one sub-module containing power semiconductor devices connected in series.
  • An embodiment of the present application also provides a power transmission system, wherein the power transmission system includes the inverter as described above, wherein the number of the inverter is N, N is an integer greater than or equal to 1, and N The inverter is connected by a DC transmission line.
  • 2M DC switches are configured on the DC transmission line, and M is an integer greater than or equal to 1.
  • the DC switch is configured with a current detection unit to detect the magnitude and direction of the current flowing.
  • the DC switch is equipped with a communication unit to exchange data with each other and establish communication with the controller of the inverter.
  • An embodiment of the present application also provides a method for controlling a current-limiting controllable lightning arrester.
  • the current-limiting controllable arrester includes a first arrester and a variable arrester connected in series, and the variable arrester includes a second arrester connected in parallel.
  • a bypass branch the bypass branch includes a first bypass switch, wherein the control method includes: closing the first bypass switch when receiving an action instruction; The first bypass switch.
  • the bypass branch further includes a first current limiting unit connected in series with the first bypass switch, and the first current limiting unit includes a second current limiting unit connected in parallel.
  • a bypass switch and a current-limiting device the current-limiting device includes a resistor, an inductor, or a combination of a resistor and an inductor, wherein the control method further includes: when the first bypass switch is closed, maintaining the second bypass The switch is in the closed state; when receiving the current limit instruction, the second bypass switch is separated and the current limiting device is turned on; when the current limit return instruction is received, the second bypass switch is closed, and the limit The flow device exits.
  • the bypass branch further includes a second current limiting unit connected in series with the first bypass switch, and the second current limiting unit includes an energy storage element, a bridge
  • the DC side of the bridge circuit is connected to the energy storage element, the bridge circuit implements AC/DC conversion, and the primary side of the isolation transformer is led out as the connection port of the second current limiting unit ,
  • the secondary side of the isolation transformer is connected to the AC side of the bridge circuit, wherein the control method further includes: upon receiving a current limit instruction, the bridge circuit is unlocked and enters the inverter mode, and the reverse voltage is output , Limit the current flowing through the first arrester; when receiving a current limit return instruction, the bridge circuit is switched to the bypass mode; when the first bypass switch is separated, the bridge circuit is blocked.
  • An embodiment of the present application also provides a method for controlling a power transmission system.
  • the power transmission system includes the inverters as described above.
  • the number of the inverters is N, where N is an integer greater than or equal to 1, and N number of converters
  • the current converter is connected by a DC transmission line, and 2M DC switches are configured on the DC transmission line, and M is an integer greater than or equal to 1.
  • the bypass branch includes the The first current-limiting unit or the second current-limiting unit, wherein, when a single-phase ground fault occurs at the positive or negative pole of the DC transmission line of the power transmission system, the method includes: a voltage transformer of a non-grounded pole detects a voltage increase , Judge the occurrence of a ground fault; the current-limiting controllable arrester connected to the non-grounded pole in the converter acts to increase the voltage at both ends of the first arrester and limit the overvoltage of the non-grounded pole; according to the magnitude and direction of the fault current Judge the fault point and issue a trip command to two adjacent DC switches; issue a current-limiting command to the current-limiting controllable arrester connected to the non-grounding pole in the converter, so that the first current-limiting unit or the second current-limiting unit is activated , Limit the current flowing through the first arrester; disconnect the adjacent DC switch at the fault point; after the non-grounded voltage transformer detects that the voltage returns to normal
  • the technical solution provided by the embodiment of the application adopts a current-limiting controllable arrester.
  • the second arrester that is, the variable part of the arrester
  • the overcurrent caused by the sudden change of the terminal voltage can reduce the switching impact and increase the service life of the arrester.
  • the current-limiting unit can be actively switched on again.
  • the input of the current-limiting unit will reduce the current-bearing current of the first arrester (that is, the fixed part of the arrester) of the current-limiting controllable arrester, which is beneficial to reduce the arrester’s Capacity selection and cost reduction.
  • the fault current is actually converted into a controllable overcurrent current, so that the overcurrent current can ensure the safety of the equipment on the premise of satisfying the protection selectivity.
  • the current limiting unit is selectively used for current conditions, and the control is flexible.
  • Fig. 1 is a first embodiment of a current-limiting controllable lightning arrester provided by an embodiment of the present application.
  • Fig. 2 is a second embodiment of a current-limiting controllable lightning arrester provided by an embodiment of the present application.
  • Fig. 3 is a third embodiment of a current-limiting controllable arrester provided by an embodiment of the present application.
  • Fig. 4 is a schematic structural diagram of a converter including a current-limiting controllable arrester provided by an embodiment of the present application.
  • Fig. 5 is a schematic structural diagram of an AC-DC converter in a converter provided by an embodiment of the present application.
  • FIG. 6 is a schematic structural diagram of Embodiment 1 of a power transmission system containing a current-limiting controllable arrester converter provided by an embodiment of the present application.
  • Fig. 7 is a schematic structural diagram of a second embodiment of a power transmission system containing a current-limiting controllable arrester converter provided by an embodiment of the present application.
  • Fig. 8 is a fault current circuit diagram of a second embodiment of a power transmission system including a current-limiting controllable arrester converter provided by an embodiment of the present application.
  • the purpose of this application is to provide a current-limiting controllable arrester, a converter, a power transmission system, and a control method.
  • the active control of the fault current is realized, and on the one hand, the differential protection can accurately detect the fault.
  • the location can quickly remove the fault; on the other hand, the short-circuit fault current is converted into an overcurrent current after the current limit, so as to achieve reliable protection of the equipment.
  • the embodiment of the present application provides a current-limiting controllable lightning arrester 1.
  • the current-limiting controllable arrester includes a first arrester 3 and a variable arrester connected in series, and the variable arrester includes a second arrester 4 connected in parallel and a bypass branch.
  • the bypass branch 2 includes any one of three combinations.
  • the bypass branch 2 includes a first bypass switch 5.
  • the bypass branch 2 includes a first bypass switch 5 and a first current limiting unit connected in series, and the first current limiting unit includes a second bypass switch 6 and a current limiting device connected in parallel to each other 7.
  • the current limiting device 7 includes a resistance, an inductance, or a combination of resistance and inductance.
  • the bypass branch 2 includes a first bypass switch 5 and a second current limiting unit connected in series, and the second current limiting unit includes an isolation transformer 8, a bridge circuit 9 and an energy storage element 10.
  • the primary side of the isolation transformer 8 is led out as the connection port of the second current limiting unit, the secondary side of the isolation transformer 8 is connected to the AC side of the bridge circuit 9, and the DC side of the bridge circuit 9 is connected to the energy storage element 10.
  • the bridge circuit realizes AC-DC conversion.
  • the first bypass switch 5 and the second bypass switch 6 include solid-state switches or fast mechanical switches composed of power semiconductor devices.
  • the first bypass switch 5 is a fast mechanical switch.
  • the operating voltage of the first arrester 3 is greater than the rated voltage of the DC side output to the ground. That is, when the current-limiting controllable arrester is not operating, the total operating voltage threshold is greater than the rated value of DC-to-ground voltage to avoid malfunction.
  • the technical solution provided in this embodiment uses a current-limiting controllable arrester.
  • the second arrester that is, the variable part of the arrester
  • the second arrester can be used to limit the switching process through the current-limiting unit during switching. Due to the overcurrent generated by the sudden change of the terminal voltage, the switching impact is reduced and the service life of the arrester can be increased.
  • the current-limiting unit can be actively switched on again.
  • the input of the current-limiting unit will reduce the current-bearing current of the first arrester (that is, the fixed part of the arrester) of the current-limiting controllable arrester, which is beneficial to reduce the arrester’s Capacity selection and cost reduction.
  • the fault current is actually converted into a controllable overcurrent current, so that the overcurrent current can ensure the safety of the equipment on the premise of satisfying the protection selectivity.
  • the current limiting unit is selectively used for current conditions, and the control is flexible.
  • an embodiment of the present application also provides a converter, including an AC-DC converter 20 and two current-limiting controllable arresters 1 as described above.
  • the AC-DC converter 20 converts AC to DC, and the leading ends are respectively defined as the DC side output positive and the DC output negative.
  • One end of the two current-limiting controllable arresters 1 is respectively connected to the DC side output positive pole and the DC output negative pole, and the other end is grounded.
  • the converter also includes a controller and two voltage transformers PT.
  • the two voltage transformers respectively detect the ground voltage of the DC side output positive and DC output negative, and the obtained voltage signals are sent to the controller.
  • the AC-DC converter includes three-phase six-legs, and each bridge-arm includes at least one sub-module containing power semiconductor devices connected in series.
  • each sub-module is a half-bridge sub-module composed of two power semiconductor devices and a DC capacitor.
  • the inverter designed with a current-limiting controllable arrester provided in this embodiment adopts the controllable arrester to be configured on the positive and negative poles of the DC output of the converter.
  • the current-limiting controllable arrester is composed of two parts, and no failure occurs in the system.
  • the bypass switch is controlled to separate, the two arresters are put into the circuit, and the operating voltage of the current-limiting controllable arrester is the sum of the voltages of the two arresters to ensure that it will not malfunction.
  • it can effectively limit the lightning Voltage: When a single-pole ground fault occurs, the voltage transformer detects that the non-grounded pole's ground voltage rises to twice the original value.
  • controlling the action of the current-limiting controllable arrester is equivalent to reducing the current-limiting type
  • the ground voltage of the controllable arrester ensures that the voltage to the ground of the converter is limited to a safe range.
  • the current-limiting controllable arrester operates, it is equivalent to providing a grounding resistance of small resistance.
  • a fault current circulation loop is constructed between the ground electrodes, and the direction and amplitude of the fault current can be detected, which provides a basis for fault location.
  • the current-limiting controllable arrester can be integrated with the converter. On the one hand, it provides nearby protection for the most valuable converter in the converter station. On the other hand, it simplifies the converter station system design and reduces the total cost. Land area.
  • An embodiment of the present application also provides a power transmission system, including the above-mentioned converters, the number of converters is N, and N is an integer greater than or equal to 1, and the N converters are connected by a DC transmission line.
  • 2M DC switches are configured on the DC transmission line, and M is an integer greater than or equal to 1.
  • the DC switch is equipped with a current detection unit, which can detect the magnitude and direction of the current flowing.
  • the DC switch is equipped with a communication unit, which can exchange data with each other and establish communication with the controller of the inverter.
  • Two converters (Converter 1 and Converter 2) are connected by a DC transmission line, and both ends of the DC transmission line are installed. There is a DC switch.
  • Inverter 1 and inverter 2 are connected through a DC transmission line, and inverter 1 and inverter 2 also pass through DC transmission line connection, DC switches are installed at both ends of the DC transmission line.
  • the power transmission system provided in this embodiment includes a current-limiting controllable arrester and a DC switch.
  • the controllable arrester operates to provide fault current.
  • the DC transmission line where the fault occurs can be located and determined After the faulted line, the fault current can be disconnected by the DC switch and the fault can be removed.
  • other converters can also operate continuously, reducing the range of system power failure and greatly improving the reliability of the system Sex.
  • the embodiment of the present application also includes a control method of a current-limiting controllable arrester.
  • the first bypass switch 5 When an action command is received, the first bypass switch 5 is closed.
  • the first bypass switch 5 is opened.
  • the second bypass switch 6 When an action instruction is received, the second bypass switch 6 remains in a closed state, and the first bypass switch 5 is closed.
  • the second bypass switch 6 When the current limiting instruction is received, the second bypass switch 6 is separated, and the current limiting device 7 is turned on.
  • the second bypass switch 6 When receiving the current-limiting return instruction, the second bypass switch 6 is closed, and the current-limiting device 7 is withdrawn.
  • the first bypass switch 5 is opened.
  • the first bypass switch 5 When an action command is received, the first bypass switch 5 is closed.
  • the bridge circuit 9 When receiving the current limiting command, the bridge circuit 9 is unlocked and enters the inverter mode, outputs a reverse voltage, and limits the current flowing through the first arrester 3.
  • the bridge circuit 9 switches to the bypass mode.
  • the embodiment of the present application also provides a control method of the power transmission system as described above.
  • a voltage transformer with a non-grounded electrode detects a voltage increase and determines that a ground fault occurs.
  • the control process is as follows.
  • the current-limiting controllable lightning arrester 1 connected to the non-grounded electrode in the converter acts to increase the voltage at both ends of the first lightning arrester 3 to limit the overvoltage of the non-grounded electrode.
  • the fault point is judged according to the magnitude and direction of the fault current obtained in the current detection unit, and a trip command is issued to two adjacent DC switches.
  • a current-limiting controllable lightning arrester connected to the non-grounded pole in the inverter is issued a current-limiting command, so that the first current-limiting unit or the second current-limiting unit is turned on to limit the current flowing through the first lightning arrester 3.
  • the current-limiting controllable arrester After the non-grounded voltage transformer detects that the voltage returns to normal or the fault current is cleared, the current-limiting controllable arrester returns and the system resumes normal operation.
  • converter 1 and converter 2 are connected by a DC transmission line
  • converter 1 and converter 3 are also connected by a DC transmission line. It is connected together to supply power to the DC load.
  • the rated voltage of the positive pole of the DC side to ground is +200kV
  • the rated voltage of the negative pole of the DC side to ground is -200kV.
  • the operating voltage of the first arrester 3 of the current-limiting controllable arrester The threshold value is designed to be 240kV
  • the threshold value of the second arrester's operating voltage is designed to be 160kV.
  • the total operating voltage threshold of the first arrester 3 and the second arrester is 400kV, which is much larger than the rated value of 200kV to avoid malfunction.
  • the negative-to-ground voltage of all inverters doubles and rises to 400kV.
  • the negative PT detects the voltage rise and sends it up
  • the control system issues action instructions to the current-limiting controllable arresters of each station.
  • the bypass branch of the current-limiting controllable arrester is shown in Figure 2.
  • the first current-limiting unit is composed of an IGBT with an anti-parallel diode and a resistor in parallel.
  • the first bypass switch 5 is closed. Since the voltage on both ends of the first arrester rises to 400kV, the first arrester 3 starts to absorb energy, and the current flowing through rises. The current value depends on the terminal voltage of the arrester. In this embodiment, at 400kV When, the current can reach 10kA. It is equivalent to the equivalent resistance of the arrester at this time is about 40 ⁇ .
  • the fault currents are respectively I1, I2, I3, as shown in Figure 7, the circuit breaker D1 can detect the fault current from converter 1 and converter 3.
  • the direction is the direction out of inverter 1
  • D2 can detect the fault current from inverter 2
  • the direction is the direction out of inverter 2
  • D3 and D4 can detect the fault current from inverter 3, and the direction is The direction of flow into converter 1; according to the direction of current, it can be judged that the fault point should be between converter 1 and converter 2.
  • the fault point can be removed by separating the circuit breakers D1 and D2, and the commutation Normal operation can still be maintained between inverter 1 and inverter 3.
  • the first bypass switch 5 is separated, and the current-limiting controllable arrester restores the mode in which the first arrester 5 and the second arrester 6 are connected in series.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Emergency Protection Circuit Devices (AREA)
  • Inverter Devices (AREA)

Abstract

La présente invention concerne un parafoudre pouvant être commandé limiteur de courant, un convertisseur, un système de transmission de puissance et un procédé de commande. Le parafoudre pouvant être commandé limiteur de courant comprend un premier parafoudre et un parafoudre variable qui sont connectés en série ; le parafoudre variable comprend un second parafoudre et une branche de dérivation qui sont connectés en parallèle ; et la branche de dérivation comprend un premier sectionneur de dérivation.
PCT/CN2020/076028 2019-05-21 2020-02-20 Parafoudre pouvant être commandé limiteur de courant, convertisseur, système de transmission de puissance et procédé de commande WO2020233180A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN201910423139.XA CN111987706B (zh) 2019-05-21 2019-05-21 一种限流型可控避雷器、换流器、输电系统以及控制方法
CN201910423139.X 2019-05-21

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WO2020233180A1 true WO2020233180A1 (fr) 2020-11-26

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CN (1) CN111987706B (fr)
WO (1) WO2020233180A1 (fr)

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CN113612469A (zh) * 2021-07-27 2021-11-05 许继集团有限公司 一种电子开关可控自恢复电路的阻抗匹配装置
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