WO2017050103A1 - 级联全桥高压直流断路器及快速重合方法、存储介质 - Google Patents

级联全桥高压直流断路器及快速重合方法、存储介质 Download PDF

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Publication number
WO2017050103A1
WO2017050103A1 PCT/CN2016/097698 CN2016097698W WO2017050103A1 WO 2017050103 A1 WO2017050103 A1 WO 2017050103A1 CN 2016097698 W CN2016097698 W CN 2016097698W WO 2017050103 A1 WO2017050103 A1 WO 2017050103A1
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full
branch
circuit breaker
bridge
voltage
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English (en)
French (fr)
Inventor
魏晓光
周万迪
贺之渊
张升
刘远
高阳
陈龙龙
杨兵建
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Global Energy Interconnection Research Institute Co Ltd
State Grid Corp of China SGCC
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Global Energy Interconnection Research Institute Co Ltd
State Grid Corp of China SGCC
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Priority to EP16847985.5A priority Critical patent/EP3355431B1/en
Publication of WO2017050103A1 publication Critical patent/WO2017050103A1/zh
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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
    • H02H3/087—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 for DC applications
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
    • H01H33/02—Details
    • H01H33/59—Circuit arrangements not adapted to a particular application of the switch and not otherwise provided for, e.g. for ensuring operation of the switch at a predetermined point in the AC cycle
    • H01H33/596—Circuit arrangements not adapted to a particular application of the switch and not otherwise provided for, e.g. for ensuring operation of the switch at a predetermined point in the AC cycle for interrupting DC
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
    • H01H9/54—Circuit arrangements not adapted to a particular application of the switching device and for which no provision exists elsewhere
    • H01H9/541—Contacts shunted by semiconductor devices
    • H01H9/542—Contacts shunted by static switch means
    • H01H2009/543—Contacts shunted by static switch means third parallel branch comprising an energy absorber, e.g. MOV, PTC, Zener
    • 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
    • H02H3/02—Details
    • H02H3/021—Details concerning the disconnection itself, e.g. at a particular instant, particularly at zero value of current, disconnection in a predetermined order
    • 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
    • H02H3/02—Details
    • H02H3/06—Details with automatic reconnection

Definitions

  • the invention relates to the technical field of power electronics, in particular to an improved cascaded full-bridge high-voltage DC circuit breaker, a quick reclosing method thereof and a storage medium.
  • high-voltage DC circuit breaker has become one of the key equipment to ensure stable and safe operation of the system.
  • the hybrid mechanical switch and the fully-controlled power electronic switch DC circuit breaker technology have the low loss characteristics of the mechanical switch and the fast breaking characteristics of the power electronic switch. It is the most effective technical way to apply DC disconnection in the high voltage transmission system.
  • high-voltage DC circuit breakers should be equipped with high-current disconnection and fast reclosing capability.
  • an embodiment of the present invention provides an improved cascaded full-bridge high-voltage DC circuit breaker, a quick reclosing method thereof, and a storage medium.
  • a technical solution of an improved cascaded full bridge high voltage DC circuit breaker in an embodiment of the present invention is:
  • the DC circuit breaker includes a main flow branch, a transfer current branch and an energy absorption branch respectively connected in parallel;
  • the main flow branch includes a series mechanical switch and a full bridge module circuit, the full bridge module circuit includes 1 or at least 2n full bridge module units, n is at least 1;
  • the transfer current branch includes at least two full-bridge modular units connected in series;
  • the energy absorption branch includes a lightning arrester.
  • the full bridge module unit comprises a first resistor, a first capacitor, a first diode and four fully controlled power electronic devices;
  • the four fully-controlled power electronic devices constitute a power module of a full bridge structure
  • the first capacitor and the first diode are connected in series and connected between the upper arm and the lower arm of the power module; the first resistor is connected in parallel at both ends of the first capacitor;
  • the full bridge module unit includes a second resistor, a second capacitor, a second diode, and four fully controlled power electronic devices;
  • the four fully-controlled power electronic devices constitute a power module of a full bridge structure
  • the second capacitor and the second diode are connected in series and connected between the upper arm and the lower arm of the power module; the second resistor is connected in parallel at both ends of the second diode;
  • the full bridge module circuit in the main flow branch is composed of at least one full bridge module parallel branch in series;
  • the full bridge parallel branch routing is composed of at least one full bridge module unit in parallel;
  • the number of full bridge module units in the transfer current branch is much larger than the main pass The number of full bridge module units in the flow branch.
  • a technical solution for a fast coincidence method for an improved cascaded full-bridge high-voltage DC circuit breaker in an embodiment of the present invention includes:
  • Step 1 Trigger all the full bridge module units in the branch current branch
  • Step 2 Determine whether the DC circuit breaker is re-closed to the fault line or the sound line:
  • the transfer current branch is blocked, and the fault current is transferred to the energy absorption branch, and the arrester of the energy absorption branch absorbs the fault current;
  • the improved cascaded full-bridge high-voltage DC circuit breaker and the rapid recombination method and storage medium provided by the embodiments of the invention can realize the rapid coincidence of the cascaded full-bridge high-voltage DC circuit breaker in a few milliseconds.
  • FIG. 1 is a topological structural view of a modified cascaded full bridge high voltage DC circuit breaker according to an embodiment of the present invention
  • FIG. 2 is a topological structural diagram of a first full-bridge module unit according to an embodiment of the present invention
  • FIG. 3 is a topological structural diagram of a second full-bridge module unit according to an embodiment of the present invention.
  • Figure 4 is a diagram of a fast overlap discharge path of a full bridge module
  • FIG. 5 is a diagram showing the discharge path of the full bridge module unit shown in Figure 2;
  • FIG. 6 is a discharge path diagram of the full bridge module unit shown in FIG. 3;
  • FIG. 7 is a current path diagram of a fast-reclosing of a modified cascaded full-bridge high-voltage DC circuit breaker to a faulty line in an embodiment of the present invention
  • FIG. 8 is a current path diagram of a fast reclosing of a modified cascaded full bridge high voltage direct current circuit breaker in a healthy line according to an embodiment of the present invention.
  • FIG. 1 An embodiment of the improved cascaded full-bridge high-voltage DC circuit breaker provided by the embodiment of the present invention is as shown in FIG. 1 , specifically:
  • the improved cascaded full-bridge high-voltage DC circuit breaker includes a main flow branch, a transfer current branch, and an energy absorption branch that are respectively connected in parallel.
  • An energy absorption branch for consuming and absorbing fault current An energy absorption branch for consuming and absorbing fault current.
  • the main flow branch in this embodiment includes a mechanical switch K and a full bridge module circuit connected in series. among them,
  • the full bridge module circuit includes one or at least 2n full bridge module units, n being at least one.
  • the full bridge module circuit is composed of at least one full bridge module parallel branch in series;
  • the full bridge parallel branch is composed of at least one full bridge module unit in parallel.
  • the transfer current branch in this embodiment includes at least two full-bridge modular units connected in series.
  • the number of full bridge modular units in the transfer current branch is much larger than the number of full bridge modular units in the main flow branch.
  • the energy absorption branch includes a lightning arrester.
  • the full bridge module unit includes two topologies:
  • the first topology is a first topology
  • the full bridge module unit includes a first resistor R, a first capacitor C, a first diode D, and four fully controlled power electronics.
  • the first capacitor C and the first diode D are connected in series and connected between the upper arm and the lower arm of the power module;
  • the first resistor R is connected in parallel across the first capacitor C.
  • the second topology is the second topology
  • the full bridge module unit includes a second resistor R, a second capacitor C, a second diode D and four fully controlled power electronics.
  • the second capacitor C and the second diode D are connected in series and connected between the upper arm and the lower arm of the power module;
  • the second resistor R is connected in parallel across the second diode D.
  • the full-bridge module unit in the blocking transfer current branch completes the DC circuit breaker after a few milliseconds, and then returns to the steady state of the circuit breaker.
  • the embodiment of the invention further provides a computer readable storage medium, the storage medium comprising a set of instructions for performing the fast coincidence method described above.
  • the fault current is charged by the diode to the capacitors of the full-bridge module units of the transfer current branch to establish a transient breaking voltage. Since the single-state diode state loss is extremely low, the DC open circuit is not affected. The speed at which the transient breaking voltage is established during the breaking process ensures that the breaking speed is not affected.
  • each capacitor of the cascaded full-bridge DC circuit breaker stores a certain amplitude voltage due to system current charging, and the voltage does not exceed the withstand voltage of a single power device. Value, because the resistance of the resistors connected in parallel across the capacitor is relatively large, generally reaching the level of tens of thousands of ohms, making the capacitor voltage bleed unexpectedly slow.
  • the system In a multi-terminal DC and DC grid, after a transient fault occurs, the system generally needs to overlap in a hundred milliseconds. At this time, the full-bridge module capacitor of the cascaded full-bridge DC breaker still stores a higher voltage. If the breaker is put back into operation, The capacitor inside the full bridge module will directly discharge the power device, posing the risk of damaging the DC breaker.
  • the full bridge module unit of the transfer current branch can be safely triggered due to the single phase conduction characteristic of the diode.
  • FIG. 5 when the IGBT is turned on, since the barrier capacitor voltage of the diode can only be discharged through the parallel resistor, the IGBT is not discharged.
  • Figure 6 when the IGBT is turned on, the capacitor can only discharge the IGBT of the upper and lower arms through the resistor, so the capacitor discharges the IGBT discharge current below the safe level. Since the capacitor voltage does not exceed the withstand voltage of the IGBT, the resistance of the resistor R and its power are low, which does not bring design difficulty.
  • the full-bridge module unit shown in Fig. 6 adopts a structure in which the resistor and the diode are connected in parallel and connected in series with the capacitor, and the leakage circuit caused by the system voltage after the DC breaker is completed is basically disappeared, and the continuous heating of the resistor is not caused.
  • the embodiment of the present invention can realize the cascaded full-bridge high-voltage DC circuit breaker in a few milliseconds.
  • the speed is coincident, and the application range of the cascaded full-bridge DC circuit breaker can be expanded to further improve the operational reliability and economy of the flexible multi-terminal and DC power grid; further, the embodiment of the present invention can greatly reduce the resistance in the full-bridge module unit.
  • the resistance and power are beneficial to its layout in the structural design, improve the operational reliability of the full-bridge module unit, and at the same time reduce the leakage current of the faulty system after the DC breaker is completed, which is more reliable. Achieve the isolation of a sound system from the point of failure.
  • the embodiment of the invention can realize the rapid overlap of the cascaded full-bridge high-voltage DC circuit breaker in a few milliseconds, can expand the application range of the cascaded full-bridge DC circuit breaker, and further improve the operational reliability and economy of the flexible multi-terminal and DC power grid; It can also greatly reduce the resistance and power of the resistor in the full-bridge module unit, which is beneficial to its layout in the structural design and improve the operational reliability of the full-bridge module unit. Moreover, it can reduce the fault after the DC breaker is completed. The leakage current of the system is basically disappeared, and the isolation of the sound system from the fault point is more reliable.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)
  • Emergency Protection Circuit Devices (AREA)

Abstract

一种改进型级联全桥高压直流断路器及其快速重合方法、存储介质，包括主通流支路、转移电流支路和能量吸收支路；主通流支路包括串联的机械开关（K）和全桥模块电路；转移电流支路包括至少两个串联的全桥模块单元；能量吸收支路包括避雷器。与现有技术相比，能够实现级联全桥高压直流断路器在数毫秒内快速重合。

Description

级联全桥高压直流断路器及快速重合方法、存储介质 技术领域
本发明涉及电力电子技术领域，具体涉及一种改进型级联全桥高压直流断路器及其快速重合方法、存储介质。
背景技术
随着基于电压源换流器(VSC)的多端柔性直流和直流电网技术的开始应用，高压直流断路器成为保证系统稳定安全可靠运行的关键设备之一。混合采用机械开关和全控型电力电子开关直流断路器技术兼具了机械开关的低损耗特性和电力电子开关的快速分断特性，是目前应用高压输电系统中直流分断最为有效的技术途径。高压直流断路器应用于的含有大容量的架空线柔性多端直流和直流电网时，除了具备快速和低损耗等特性外，还应具备强电流分断以及快速重合闸能力。
迄今国外已公布研制成功的混合式直流断路器受限制于单个全控器件分断能力，均存在分断电流相对较低的问题(不超过10kA)，难以满足实际系统分断电流需求。国内所提出的级联全桥直流断路器虽然显著提高了自身分断电流能力(达到15kA)，但由于分断完成后各模块单元内部电容储存电压很难快速释放，导致其在快速重合闸应用存在发生直通短路而损坏直流断路器的风险。此外，断路器分断完成后泄露电流相对较大致使断路器内部泄放电阻发热较高的问题，也需要进一步优化。
因此，需要提供一种能够有效阻止全桥模块内部直流短路现象发生，实现直流断路器安全可靠的快速重合的级联型全桥高压直流断路器。
发明内容
为了满足现有技术的需要，本发明实施例提供了一种改进型级联全桥高压直流断路器及其快速重合方法、存储介质。
第一方面，本发明实施例中一种改进型级联全桥高压直流断路器的技术方案是：
所述直流断路器包括分别并联的主通流支路、转移电流支路和能量吸收支路；
所述主通流支路包括串联的机械开关和全桥模块电路，所述全桥模块电路包括1个或者至少2n个全桥模块单元，n至少为1；
所述转移电流支路包括至少两个串联的全桥模块单元；
所述能量吸收支路包括避雷器。
优选的，所述全桥模块单元包括第一电阻、第一电容器、第一二极管和4个全控型电力电子器件；
所述4个全控型电力电子器件构成全桥结构的功率模块；
所述第一电容器和第一二极管串联后连接于所述功率模块的上桥臂与下桥臂之间；所述第一电阻并联在第一电容器两端；
优选的，所述全桥模块单元包括第二电阻、第二电容器、第二二极管和4个全控型电力电子器件；
所述4个全控型电力电子器件构成全桥结构的功率模块；
所述第二电容器和第二二极管串联后连接于所述功率模块的上桥臂与下桥臂之间；所述第二电阻并联在第二二极管两端；
优选的，所述主通流支路中全桥模块电路由至少一个全桥模块并联支路串联组成；
所述全桥并联支路由至少一个全桥模块单元并联组成；
优选的，所述转移电流支路中全桥模块单元的数量远远大于所述主通 流支路中全桥模块单元的数量。
第二方面，本发明实施例中一种改进型级联全桥高压直流断路器的快速重合方法的技术方案包括：
步骤1：触发转移电流支路中所有的全桥模块单元；
步骤2：判断所述直流断路器重新合闸于故障线路还是健全线路：
若直流断路器重新合闸于故障线路，则闭锁转移电流支路，将故障电流转移至能量吸收支路，所述能量吸收支路的避雷器吸收该故障电流；
若直流断路器重新合闸于健全线路，则触发主通流支路中所有的全桥模块单元；触发所述全桥模块单元后闭合主通流支路的机械开关，负荷电流经主通流支路导通。
本发明实施例提供的改进型级联全桥高压直流断路器及其快速重合方法、存储介质，能够实现级联全桥高压直流断路器在数毫秒内快速重合。
附图说明
下面结合附图对本发明实施例进一步说明。
图1为本发明实施例中改进型级联全桥高压直流断路器拓扑结构图；
图2为本发明实施例中第一种全桥模块单元的拓扑结构图；
图3为本发明实施例中第二种全桥模块单元的拓扑结构图；
图4为全桥模块快速重合放电通路图；
图5为图2所示全桥模块单元放电通路图；
图6为图3所示全桥模块单元放电通路图；
图7为本发明实施例中改进型级联全桥高压直流断路器快速重合闸于故障线路的电流通路图；
图8为本发明实施例中改进型级联全桥高压直流断路器快速重合闸于健全线路的电流通路图。
具体实施方式
下面详细描述本发明的实施例，所述实施例的示例在附图中示出，其中自始至终相同或类似的标号表示相同或类似的元件或具有相同或类似功能的元件。下面通过参考附图描述的实施例是示例性的，旨在用于解释本发明，而不能理解为对本发明的限制。
本发明实施例提供的一种改进型级联全桥高压直流断路器的实施例如图1所示，具体为：
该改进型级联全桥高压直流断路器包括分别并联的主通流支路、转移电流支路和能量吸收支路。
主通流支路，用于导通负荷电流；
转移电流支路，用于在电力系统发生故障时将故障电流转移至能量吸收支路；
能量吸收支路，用于消耗吸收故障电流。
1、主通流支路
本实施例中主通流支路包括串联的机械开关K和全桥模块电路。其中，
①：全桥模块电路包括1个或者至少2n个全桥模块单元，n至少为1。
②：全桥模块电路由至少一个全桥模块并联支路串联组成；
该全桥并联支路由至少一个全桥模块单元并联组成。
2、转移电流支路
本实施例中转移电流支路包括至少两个串联的全桥模块单元。
转移电流支路中全桥模块单元的数量远远大于主通流支路中全桥模块单元的数量。
3、能量吸收支路
本实施例中能量吸收支路包括避雷器。
本实施例中全桥模块单元包括两种拓扑结构：
第一种拓扑结构：
如图2所示，全桥模块单元包括第一电阻R、第一电容器C、第一二极管D和4个全控型电力电子器件。
①：4个全控型电力电子器件构成全桥结构的功率模块；
②：第一电容器C和第一二极管D串联后连接于功率模块的上桥臂与下桥臂之间；
③：第一电阻R并联在第一电容器C两端。
第二种拓扑结构：
如图3所示，全桥模块单元包括第二电阻R、第二电容器C、第二二极管D和4个全控型电力电子器件.
①：4个全控型电力电子器件构成全桥结构的功率模块；
②：第二电容器C和第二二极管D串联后连接于功率模块的上桥臂与下桥臂之间；
③：第二电阻R并联在第二二极管D两端。
本发明实施例提供的改进型级联全桥高压直流断路器的快速重合方法的步骤为：
1、触发转移电流支路中所有的全桥模块单元；
2、判断直流断路器重新合闸于故障线路还是健全线路：
①：若直流断路器重新合闸于故障线路，则闭锁转移电流支路，将故障电流转移至能量吸收支路，如图7所示；
②：若直流断路器重新合闸于健全线路，则触发主通流支路中所有的全桥模块单元；触发全桥模块单元后闭合主通流支路的机械开关，负荷电流经主通流支路导通，如图8所示。
③：闭锁转移电流支路中的全桥模块单元，在数毫秒内完成直流断路器分断后重合，从而恢复至断路器稳态下状态。
本发明实施例还提出一种计算机可读存储介质，该存储介质包括一组指令，所述指令用于执行上述快速重合方法。
本实施例中直流断路器在分断过程中，故障电流经过二极管对转移电流支路各个全桥模块单元的电容器充电，建立暂态分断电压，由于单个二极管通态损耗极低，因此不影响直流断路器分断过程中暂态分断电压的建立速度，从而保障其分断速度不受影响。
如图4所示，现有技术中直流断路器完成分断后，级联全桥直流断路器的各个电容器因系统电流充电而存储一定幅值的电压，该电压不超过单个功率器件的耐受电压值，由于并联于电容两端的电阻阻值较大，一般达到数十千欧的级别，使得电容电压泄放奇迹缓慢。在多端直流及直流电网中，发生瞬时性故障后系统一般要求在百毫秒左右重合，此时级联全桥直流断路器全桥模块电容依然存储有较高的电压，若断路器重新投入运行，全桥模块内部的电容将会直接对功率器件放电，存在损坏直流断路器的风险。
本实施例中在全桥模块单元的电容器带电的情况下，由于二极管的单相导通特性，可以安全的触发转移电流支路的全桥模块单元。如图5所述，当IGBT导通时，由于二极管的阻隔电容电压只能经并联电阻泄放，不会对IGBT放电。如图6所示，当IGBT导通时，电容只能经过电阻对上下桥臂的IGBT放电，因此通过该电阻将电容对IGBT放电电流限制于安全水平之下。由于电容电压不超过IGBT的耐受电压，因此所需要电阻R的阻值及其功率均较低，不会带来设计难度。
同时，图6所示全桥模块单元采用电阻与二极管并联后与电容器串联的结构，还能使得直流断路器在完成分断后由系统电压引发的泄露电路基本消失，不会造成电阻的持续发热。
这样，本发明实施例能够实现级联全桥高压直流断路器在数毫秒内快 速重合，而且，能够扩展级联全桥直流断路器的应用范围，进一步提高柔性多端及直流电网的运行可靠性和经济性；进一步地，本发明实施例还能够大大降低全桥模块单元中电阻的阻值和功率，有利于其在结构设计中的布置，提高全桥模块单元的运行可靠性，同时，能够降低直流断路器分断完成后，所在故障系统的泄漏电流基本消失，更为可靠的实现健全系统与故障点的隔离。
最后应当说明的是：所描述的实施例仅是本申请一部分实施例，而不是全部的实施例。基于本申请中的实施例，本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例，都属于本申请保护的范围。
工业实用性
本发明实施例能够实现级联全桥高压直流断路器在数毫秒内快速重合，能够扩展级联全桥直流断路器的应用范围，进一步提高柔性多端及直流电网的运行可靠性和经济性；同时，还能够大大降低全桥模块单元中电阻的阻值和功率，有利于其在结构设计中的布置，提高全桥模块单元的运行可靠性；而且，能够降低直流断路器分断完成后，所在故障系统的泄漏电流基本消失，更为可靠的实现健全系统与故障点的隔离。

Claims (7)

  1. 一种改进型级联全桥高压直流断路器，所述直流断路器包括分别并联的主通流支路、转移电流支路和能量吸收支路；
    所述主通流支路包括串联的机械开关和全桥模块电路，所述全桥模块电路包括1个或者至少2n个全桥模块单元，n至少为1；
    所述转移电流支路包括至少两个串联的全桥模块单元；
    所述能量吸收支路包括避雷器。
  2. 如权利要求1所述的改进型级联全桥高压直流断路器，其中，所述全桥模块单元包括第一电阻、第一电容器、第一二极管和4个全控型电力电子器件；
    所述4个全控型电力电子器件构成全桥结构的功率模块；
    所述第一电容器和第一二极管串联后连接于所述功率模块的上桥臂与下桥臂之间；所述第一电阻并联在第一电容器两端。
  3. 如权利要求1所述的改进型级联全桥高压直流断路器，其中，所述全桥模块单元包括第二电阻、第二电容器、第二二极管和4个全控型电力电子器件；
    所述4个全控型电力电子器件构成全桥结构的功率模块；
    所述第二电容器和第二二极管串联后连接于所述功率模块的上桥臂与下桥臂之间；所述第二电阻并联在第二二极管两端。
  4. 如权利要求1所述的改进型级联全桥高压直流断路器，其中，所述主通流支路中全桥模块电路由至少一个全桥模块并联支路串联组成；
    所述全桥并联支路由至少一个全桥模块单元并联组成。
  5. 如权利要求1所述的改进型级联全桥高压直流断路器，其中，所述转移电流支路中全桥模块单元的数量远远大于所述主通流支路中全桥模块单元的数量。
  6. 如权利要求1-5任一项所述的改进型级联全桥高压直流断路器的快速重合方法，所述方法包括：
    步骤1：触发转移电流支路中所有的全桥模块单元；
    步骤2：判断所述直流断路器重新合闸于故障线路还是健全线路：
    若直流断路器重新合闸于故障线路，则闭锁转移电流支路，将故障电流转移至能量吸收支路，所述能量吸收支路的避雷器吸收该故障电流；
    若直流断路器重新合闸于健全线路，则触发主通流支路中所有的全桥模块单元；触发所述全桥模块单元后闭合主通流支路的机械开关，负荷电流经主通流支路导通。
  7. 一种计算机可读存储介质，该存储介质包括一组指令，所述指令用于执行权利要求6所述的快速重合方法。
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