WO2019105386A1 - 适用于电压源换流器的主备接入系统、控制方法及装置 - Google Patents

适用于电压源换流器的主备接入系统、控制方法及装置 Download PDF

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WO2019105386A1
WO2019105386A1 PCT/CN2018/117945 CN2018117945W WO2019105386A1 WO 2019105386 A1 WO2019105386 A1 WO 2019105386A1 CN 2018117945 W CN2018117945 W CN 2018117945W WO 2019105386 A1 WO2019105386 A1 WO 2019105386A1
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Prior art keywords
branch
working
incoming
voltage source
source converter
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PCT/CN2018/117945
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English (en)
French (fr)
Inventor
鲁江
潘磊
董云龙
邱德锋
黄如海
姜崇学
卢宇
张宝顺
李钢
胡兆庆
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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 WO2019105386A1 publication Critical patent/WO2019105386A1/zh

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/007—Arrangements for selectively connecting the load or loads to one or several among a plurality of power lines or power sources
    • H02J3/0073—Arrangements for selectively connecting the load or loads to one or several among a plurality of power lines or power sources for providing alternative feeding paths between load and source when the main path fails, e.g. transformers, busbars
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/36—Arrangements for transfer of electric power between ac networks via a high-tension dc link
    • 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]

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  • the invention belongs to the field of flexible transmission technology in a power system, and particularly relates to an active/standby access system, a control method and a device suitable for a voltage source converter.
  • VSC Voltage Source Converter
  • fully-controlled power electronic devices such as IGBT, IEGT, etc.
  • Decoupling control solves the problem of supplying power to weak systems or passive power grids, and has been widely favored by academia and industry.
  • voltage source converters in the fields of high-voltage direct current transmission, DC distribution network and flexible AC transmission systems (FACTS) Get more and more widely used applications.
  • AC fault ride-through capability is a prominent advantage of the voltage source converter.
  • the fault current can be suppressed by adopting a certain control strategy, and the operation of the system where the voltage source converter is located is maintained and quickly restored.
  • the voltage source converter will not continue to operate and needs to be shut down. Therefore, in the case of high operational reliability requirements, it is necessary to study and take effective measures to ensure that the voltage source converter can maintain operation in the event of a fault such as permanent failure on the AC power supply side.
  • the object of the present invention is to provide an active/standby access system, a control method and a device suitable for a voltage source converter, which can realize a fault condition in which a voltage source converter reliably crosses a permanent fault on an AC power source side, etc., in view of the deficiencies of the prior art. To meet the requirements of high reliability applications.
  • the technical solution adopted by the present invention is to provide an active/standby access system suitable for a voltage source converter, which includes a voltage source commutation based on a fully-controlled power electronic device.
  • a voltage source converter which includes a voltage source commutation based on a fully-controlled power electronic device.
  • two or more AC incoming branch, voltage source converter is connected to two or more AC incoming branch at the same time through a common connection point or bus, and the communication of each AC incoming branch
  • At least one breaking device is configured between the power supply to the common connection point or the bus.
  • the AC power of the AC incoming branch is directly connected to the common connection point or bus through at least one breaking device.
  • the AC power supply of the AC incoming branch is connected to the common connection point or busbar via at least one transformer component and at least one breaking device, and the transformer component and the common connection point or busbar Configure at least one disconnect device.
  • the invention also provides a master-slave access system control method suitable for a voltage source converter, the control method comprising: selecting a normal AC incoming line branch as a working branch, and connecting the working branch to the public connection
  • the breaking device between the points or busbars is placed in position to provide working power for the voltage source converter, and the dividing devices between the remaining AC incoming branch branches and the common connection point or busbar are placed in the divided position;
  • the working AC incoming branch branch fails, disconnect the working branch from the common connection point or the busbar, and then select another normal AC incoming branch as the working branch and close the working branch.
  • a disconnect device between a public connection point or a bus is
  • the method for detecting a failure of the working AC incoming branch includes:
  • Method 1 Detecting the deviation between the AC frequency value of the working AC incoming branch and the rated frequency value is greater than the set value and satisfying the set delay;
  • Method 2 Detecting the AC voltage value of any phase or three phases of the working AC incoming branch is lower than the set value and satisfying the set delay;
  • Method 3 Detecting the AC current value of any phase or three phases of the working AC incoming branch is lower than the set value and satisfying the set delay.
  • the working voltage source converter When it is detected that the working AC incoming branch branch is faulty, the working voltage source converter may be temporarily blocked, and the disconnecting device between the faulty working AC incoming branch and the common connecting point or the busbar may be disconnected and another After a normal AC incoming branch is closed with the disconnecting device between the common connection point or the bus, the voltage source converter is unlocked and resumed.
  • the present invention also provides a master-slave access system control device suitable for a voltage source converter, the control device comprising a branch collection unit, a master-slave access conventional control unit, and an active/standby access fault control unit, wherein:
  • the branch collecting unit collects the electric quantity of each AC incoming line branch and the split position data of the breaking equipment, and calculates the alternating frequency;
  • the main control unit is connected to the conventional control unit, receives the data of each AC incoming line branch collected by the branch collecting unit, and selects a normal AC incoming line branch as the working branch, and the working branch is connected with the public connection point or the bus line.
  • the breaking device is placed in position to provide working power for the voltage source converter, and the dividing devices between the remaining AC incoming branch branches and the common connection point or bus are placed in the position;
  • the active/standby access fault control unit receives the data of each AC incoming line branch collected by the branch collecting unit, and when detecting that the working AC incoming branch branch is faulty, disconnects the working branch from the common connection point or the busbar.
  • the breaking device selects another normal AC incoming branch as the working branch and closes the breaking device between the working branch and the common connection point or bus.
  • the active/standby access fault control unit includes a fault discrimination subunit and an active/standby access control subunit, where:
  • the fault discriminating subunit receives the data of each AC incoming line branch of the branch collecting unit, determines whether the working AC incoming branch branch is faulty, and whether the remaining AC incoming branch branches are normal; if the working AC incoming line branch is detected If the road fails, the active and standby access control subunits are triggered;
  • the active/standby access control subunit disconnects the breaking device between the working branch and the public connection point or the busbar, and then selects another normal AC incoming branch as the working branch and closes the working branch and the public A disconnect device between the connection points or bus bars.
  • the method for detecting the fault of the working AC incoming branch by the fault discriminating subunit includes:
  • Method 1 Detecting the deviation between the AC frequency value of the working AC incoming branch and the rated frequency value is greater than the set value and satisfying the set delay;
  • Method 2 Detecting the AC voltage value of any phase or three phases of the working AC incoming branch is lower than the set value and satisfying the set delay;
  • Method 3 Detecting the AC current value of any phase or three phases of the working AC incoming branch is lower than the set value and satisfying the set delay.
  • the active/standby access control sub-unit can temporarily temporarily lock the working voltage source converter, and disconnect the disconnecting device between the faulty working AC incoming branch and the common connection point or the busbar, and another normal After the disconnecting device between the AC incoming branch and the common connection point or busbar is closed, the voltage source converter is unlocked and resumed.
  • the invention has the beneficial effects that the present invention provides a main standby access system, a control method and a device suitable for a voltage source converter, and the voltage source commutation can be realized by adopting the main standby access system and the control method.
  • the device reliably traverses fault conditions such as permanent faults on the AC power supply side to meet the requirements of high reliability applications.
  • FIG. 1 is a schematic diagram of an active/standby access system that does not include a transformer component in an AC incoming branch;
  • FIG. 2 is a schematic diagram of an active/standby access system including a transformer component in an AC incoming branch;
  • FIG. 3 is a flow chart of a method for controlling an active/standby access system suitable for a voltage source converter provided by the present invention
  • FIG. 4 is a structural block diagram of a main standby access system control apparatus suitable for a voltage source converter provided by the present invention.
  • the invention provides a master-slave access system, a control method and a device suitable for a voltage source converter, which can realize a fault condition such as a voltage source converter reliably traversing a permanent fault on an AC power source side, and meet the requirements of a high reliability application. .
  • the solution of the present invention is to provide an active/standby access system suitable for a voltage source converter, which includes a voltage source converter based on a fully-controlled power electronic device, Two or more AC inlet branches, the voltage source converter is connected to two or more AC inlet branches at the same time through a common connection point or bus, and the AC power of each AC inlet branch is At least one breaking device is disposed between the common connection point or the bus bar, and the breaking device is used to provide a stable connection breaking point, such as a circuit breaker, an isolating knife gate, and the like.
  • FIG. 1 shows a schematic diagram of an active/standby access system that does not contain transformer components in the AC incoming branch.
  • the AC power of the AC incoming branch 1 is connected to the common connection point or bus C via the breaking device S1, and the AC incoming branch
  • the AC power source of 2 is connected to the common connection point or bus C via the breaking device S2.
  • the AC power supply of the AC incoming branch is connected to the common connection point or busbar via at least one transformer component and at least one breaking device, the transformer component and the common connection point or busbar Configure at least one disconnect device between them.
  • 2 is a schematic diagram of an active/standby access system including a transformer component in an AC incoming branch, and the AC power of the AC incoming branch 1 is connected to a common connection point or bus C via a transformer T1, a disconnecting device S1, and an AC incoming line.
  • the AC power of the branch 2 is connected to the common connection point or bus C via the transformer T2 and the breaking device S2.
  • the present invention also provides a method for controlling an active/standby access system suitable for a voltage source converter.
  • the control method includes: selecting a normal AC incoming branch as a working branch, The breaking device between the working branch and the common connection point or the busbar is placed in position to provide working power for the voltage source converter, and the dividing devices between the remaining AC incoming branch branches and the common connection point or busbar are placed When the fault of the working AC incoming branch is detected, the breaking device between the working branch and the common connection point or the busbar is disconnected, and then another normal AC incoming branch is selected as the working branch and Close the breaking device between the working branch and the common connection point or bus.
  • control methods are as follows:
  • the breaking device S1 is in the position and provides the working power for the voltage source converter, and the breaking device S2 of the normal AC incoming branch 2 is in the position;
  • the breaking device S1 is disconnected first, then the breaking device S2 is closed, and the voltage source converter is maintained.
  • control method is as follows:
  • the breaking device S1 is in the position and provides the working power for the voltage source converter, and the breaking device S2 of the normal AC incoming branch 2 is in the position;
  • the breaking device S1 is disconnected first, then the breaking device S2 is closed, and the voltage source converter is maintained.
  • the method for detecting a failure of the working AC incoming branch includes:
  • Method 1 Detecting the deviation between the AC frequency value of the working AC line branch and the rated frequency value is greater than the set value and satisfying the set delay; when the AC incoming line branch fails or the power supply is lost, the voltage source is changed.
  • the flow device loses the stable phase-locked voltage, and the frequency value of the AC voltage outputted from the AC side gradually deviates from the rated frequency value.
  • the frequency deviation is greater than the set value and meets the set delay, it can be judged as the working AC incoming line branch. error occured.
  • Method 2 Detecting the AC voltage value Uae of any phase or three phases of the working AC incoming branch is lower than the set value and satisfying the set delay; when the AC incoming branch fails or power is lost, the AC enters The AC voltage value of any phase or three phases of the line branch will decrease in amplitude. When the AC value of any phase or three phase is lower than the set value and the set delay is satisfied, it can be judged as working exchange. The line branch has failed.
  • Method 3 Detecting the alternating current value Iac of any phase or three phases of the working AC incoming branch is lower than the set value and satisfying the set delay; when the AC incoming branch fails or the power is lost, the AC enters The AC current value of any phase or three phase of the line branch will decrease in amplitude. When the AC current value Iac of any phase or three phase is lower than the set value and meets the set delay, it can be judged as working AC. The line branch has failed.
  • the working voltage source converter When it is detected that the working AC incoming branch branch is faulty, the working voltage source converter may be temporarily blocked, and the disconnecting device between the faulty working AC incoming branch and the common connecting point or the busbar may be disconnected and another After a normal AC incoming branch branch is closed with the breaking device between the common connection point or the bus bar, the voltage source converter is unlocked and resumed operation, and the measure for temporarily blocking the working voltage source converter It is beneficial to improve the fault ride-through capability of the voltage source converter.
  • the present invention also provides a master-slave access system control device suitable for a voltage source converter.
  • the control device includes a branch collection unit, a master-slave access conventional control unit, and an active/standby access. Fault control unit, where:
  • the branch collecting unit collects the electric quantity of each AC incoming line branch and the split position data of the breaking equipment, and calculates the alternating frequency;
  • the main control unit is connected to the conventional control unit, receives the data of each AC incoming line branch collected by the branch collecting unit, and selects a normal AC incoming line branch as the working branch, and the working branch is connected with the public connection point or the bus line.
  • the breaking device is placed in position to provide working power for the voltage source converter, and the dividing devices between the remaining AC incoming branch branches and the common connection point or bus are placed in the position;
  • the active/standby access fault control unit receives the data of each AC incoming line branch collected by the branch collecting unit, and when detecting that the working AC incoming branch branch is faulty, disconnects the working branch from the common connection point or the busbar.
  • the breaking device selects another normal AC incoming branch as the working branch and closes the breaking device between the working branch and the common connection point or bus.
  • the active/standby access fault control unit includes a fault discrimination subunit and an active/standby access control subunit, where:
  • the fault discriminating subunit receives the data of each AC incoming line branch of the branch collecting unit, determines whether the working AC incoming branch branch is faulty, and whether the remaining AC incoming branch branches are normal; if the working AC incoming line branch is detected If the road fails, the active and standby access control subunits are triggered;
  • the active/standby access control subunit disconnects the breaking device between the working branch and the public connection point or the busbar, and then selects another normal AC incoming branch as the working branch and closes the working branch and the public A disconnect device between the connection points or bus bars.
  • the method for detecting the fault of the working AC incoming branch by the fault discriminating subunit includes:
  • Method 1 Detecting the deviation between the AC frequency value of the working AC incoming branch and the rated frequency value is greater than the set value and satisfying the set delay;
  • Method 2 Detecting the AC voltage value of any phase or three phases of the working AC incoming branch is lower than the set value and satisfying the set delay;
  • Method 3 Detecting the AC current value of any phase or three phases of the working AC incoming branch is lower than the set value and satisfying the set delay.
  • the active/standby access control sub-unit can temporarily temporarily lock the working voltage source converter, and disconnect the disconnecting device between the faulty working AC incoming branch and the common connection point or the busbar, and another normal After the disconnecting device between the AC incoming branch and the common connection point or busbar is closed, the voltage source converter is unlocked and resumed.

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Abstract

本发明公开了一种适用于电压源换流器的主备接入系统，其包括基于全控型电力电子器件的电压源换流器、两条或两条以上交流进线支路，电压源换流器通过公共连接点或母线与两条或两条以上交流进线支路同时相连接，每条交流进线支路的交流电源与公共连接点或母线之间均配置至少一个分断设备。相应地，提供一种适用于电压源换流器的主备接入系统控制方法及装置。本发明可以实现电压源换流器可靠穿越交流电源侧永久故障等故障情况，保证满足高可靠性应用场合的要求。

Description

适用于电压源换流器的主备接入系统、控制方法及装置 技术领域
本发明属于电力系统中柔性输电技术领域，具体涉及一种适用于电压源换流器的主备接入系统、控制方法及装置。
背景技术
基于全控型电力电子器件(如IGBT、IEGT等)的电压源换流器(Voltage Source Converter，VSC)无需交流电网短路容量支持换相，不存在换相失败问题，可以实现有功和无功的解耦控制，解决了向弱系统或无源电网供电的问题，得到了学术界和工业界的广泛青睐。近些年来，随着全控型电力电子器件成本的不断降低及性能的不断提升，电压源换流器在高压直流输电、直流配电网及柔性交流输电(Flexible AC Transmission Systems，FACTS)等领域得到了越来越广泛的应用。
交流故障穿越能力是电压源换流器的一个突出优势，在交流电源侧发生短时故障情况下，通过采取一定的控制策略可以抑制故障电流，维持电压源换流器所在系统的运行并快速恢复；但当交流电源侧发生永久故障时，电压源换流器将无法继续工作，需要停运。因此，对于运行可靠性要求很高的场合，需要研究并采取有效的措施来保证电压源换流器能够在交流电源侧永久故障等故障情况下维持运行。
目前尚未见到能实现电压源换流器可靠穿越交流电源侧永久故障等故障情况的技术方案被提出。经研究，可以针对电压源换流器的特点，设计一种适用于电压源换流器的主备接入系统，用于实现电压源换流器可靠穿越交流电源侧永久故障等故障情况，保证满足高可靠性应用场合的要求。
发明内容
本发明的目的在于针对现有技术不足，提供一种适用于电压源换流器的主备接入系统、控制方法及装置，能够实现电压源换流器可靠穿越交流电源侧永久故障等故障情况，满足高可靠性应用场合的要求。
为了达成上述目的，本发明采用的技术方案是：提供一种适用于电压源换流器的主备接入系统，所述主备接入系统包括基于全控型电力电子器件的电压源换流器、两条或两条以上交流进线支路，电压源换流器通过公共连接点或母线与两条或两条以上交流进线支路同时相连接，每条交流进线支路的交流电源至公共连接点或母线之间均配置至少一个分断设备。
所述交流进线支路中不含有变压器元件时，交流进线支路的交流电源直接经过至少一个分断设备与公共连接点或母线相连接。
所述交流进线支路含有至少一个变压器元件时，交流进线支路的交流电源经过至少一个变压器元件及至少一个分断设备与公共连接点或母线相连接，变压器元件与公共连接点或母线之间配置至少一个分断设备。
本发明还提供一种适用于电压源换流器的主备接入系统控制方法，所述控制方法包括：选择一条正常的交流进线支路作为工作支路，将该工作支路与公共连接点或母线之间的分断设备置于合位为电压源换流器提供工作电源，其余各条交流进线支路与公共连接点或母线之间的分断设备均置于分位；当检测到工作交流进线支路出现故障时，断开该工作支路与公共连接点或母线之间的分断设备，之后选择另一条正常的交流进线支路作为工作支路并合上该工作支路与公共连接点或母线之间的分断设备。
所述检测工作交流进线支路出现故障的方法包括：
方法一、检测工作交流进线支路的交流频率值与额定频率值的偏差大于设定值并满足设定的延时；
方法二、检测工作交流进线支路任一相或三相的交流电压值低于设定值并满足设定的延时；
方法三、检测工作交流进线支路任一相或三相的交流电流值低于设定值并满足设定的延时。
当检测到工作交流进线支路出现故障时，可以先将工作中的电压源换流器临时闭锁，待故障工作交流进线支路与公共连接点或母线之间的分断设备断开及另一条正常的交流进线支路与公共连接点或母线之间的分断设备合上后，再将电压源换流器解锁并恢复工作。
本发明还提供一种适用于电压源换流器的主备接入系统控制装置，所述控制装置包括支路采集单元、主备接入常规控制单元、主备接入故障控制单元，其中：
支路采集单元，采集各交流进线支路的电气量和分断设备的分合位数据，并进行交 流频率的计算；
主备接入常规控制单元，接收支路采集单元采集的各交流进线支路数据，选择一条正常的交流进线支路作为工作支路，将该工作支路与公共连接点或母线之间的分断设备置于合位为电压源换流器提供工作电源，其余各条交流进线支路与公共连接点或母线之间的分断设备均置于分位；
主备接入故障控制单元，接收支路采集单元采集的各交流进线支路数据，当检测到工作交流进线支路出现故障时，断开该工作支路与公共连接点或母线之间的分断设备，之后选择另一条正常的交流进线支路作为工作支路并合上该工作支路与公共连接点或母线之间的分断设备。
所述主备接入故障控制单元包括故障判别子单元、主备接入控制子单元，其中：
故障判别子单元，接收支路采集单元的各交流进线支路数据，进行工作交流进线支路是否出现故障以及其余各交流进线支路是否正常的判别；如果检测到工作交流进线支路出现故障，则触发主备接入控制子单元；
主备接入控制子单元，断开该工作支路与公共连接点或母线之间的分断设备，之后选择另一条正常的交流进线支路作为工作支路并合上该工作支路与公共连接点或母线之间的分断设备。
所述故障判别子单元检测工作交流进线支路出现故障的方法包括：
方法一、检测工作交流进线支路的交流频率值与额定频率值的偏差大于设定值并满足设定的延时；
方法二、检测工作交流进线支路任一相或三相的交流电压值低于设定值并满足设定的延时；
方法三、检测工作交流进线支路任一相或三相的交流电流值低于设定值并满足设定的延时。
所述主备接入控制子单元，可以先将工作中的电压源换流器临时闭锁，待故障工作交流进线支路与公共连接点或母线之间的分断设备断开及另一条正常的交流进线支路与公共连接点或母线之间的分断设备合上后，再将电压源换流器解锁并恢复工作。
本发明的有益效果是：本发明提供了一种适用于电压源换流器的主备接入系统、控制方法及装置，通过采用该主备接入系统及控制方法，可以实现电压源换流器可靠穿越交流电源侧永久故障等故障情况，满足高可靠性应用场合的要求。
附图说明
图1是本发明中交流进线支路中不含有变压器元件的主备接入系统示意图；
图2是本发明中交流进线支路中含有变压器元件的主备接入系统示意图；
图3是本发明提供的适用于电压源换流器的主备接入系统控制方法的流程图；
图4是本发明提供的适用于电压源换流器的主备接入系统控制装置的结构框图。
具体实施方式
以下将结合附图及具体实施例，对本发明的技术方案进行详细说明。
本发明提供一种适用于电压源换流器的主备接入系统、控制方法及装置，能够实现电压源换流器可靠穿越交流电源侧永久故障等故障情况，满足高可靠性应用场合的要求。
为了达成上述目的，本发明的解决方案是提供一种适用于电压源换流器的主备接入系统，所述主备接入系统包括基于全控型电力电子器件的电压源换流器、两条或两条以上交流进线支路，电压源换流器通过公共连接点或母线与两条或两条以上交流进线支路同时相连接，每条交流进线支路的交流电源至公共连接点或母线之间均配置至少一个分断设备，所述分断设备用于提供一个稳定的连接断开点，如断路器、隔离刀闸等。
当所述交流进线支路中不含有变压器元件时，交流进线支路的交流电源直接经过至少一个分断设备与公共连接点或母线相连接。图1所示为交流进线支路中不含有变压器元件的主备接入系统示意图，交流进线支路1的交流电源经分断设备S1连接至公共连接点或母线C，交流进线支路2的交流电源经分断设备S2连接至公共连接点或母线C。
当所述交流进线支路含有至少一个变压器元件时，交流进线支路的交流电源经过至少一个变压器元件及至少一个分断设备与公共连接点或母线相连接，变压器元件与公共连接点或母线之间配置至少一个分断设备。图2所示为交流进线支路中含有变压器元件的主备接入系统示意图，交流进线支路1的交流电源经变压器T1、分断设备S1连接至公共连接点或母线C，交流进线支路2的交流电源经变压器T2、分断设备S2连接至公共连接点或母线C。
本发明还提供一种适用于电压源换流器的主备接入系统控制方法，如图3所示，所述控制方法包括：选择一条正常的交流进线支路作为工作支路，将该工作支路与公共连接点或母线之间的分断设备置于合位为电压源换流器提供工作电源，其余各条交流进线支路与公共连接点或母线之间的分断设备均置于分位；当检测到工作交流进线支路出现 故障时，断开该工作支路与公共连接点或母线之间的分断设备，之后选择另一条正常的交流进线支路作为工作支路并合上该工作支路与公共连接点或母线之间的分断设备。
对于图1所示的主备接入系统，其控制方法说明如下：
初始选择正常的交流进线支路1作为工作支路，分断设备S1处于合位并为电压源换流器提供工作电源，正常的交流进线支路2的分断设备S2处于分位；当检测到交流进线支路1出现故障时，先断开分断设备S1，之后合上分断设备S2，电压源换流器维持运行。
对于图2所示的主备接入系统，其控制方法说明如下：
初始选择正常的交流进线支路1作为工作支路，分断设备S1处于合位并为电压源换流器提供工作电源，正常的交流进线支路2的分断设备S2处于分位；当检测到交流进线支路1出现故障时，先断开分断设备S1，之后合上分断设备S2，电压源换流器维持运行。
所述检测工作交流进线支路出现故障的方法包括：
方法一、检测工作交流进线支路的交流频率值与额定频率值的偏差大于设定值并满足设定的延时；当交流进线支路发生故障或出现电源丢失时，由于电压源换流器失去了稳定的锁相电压，其交流侧输出的交流电压的频率值会逐渐偏离额定频率值，当频率偏差大于设定值并满足设定的延时可以判断为工作交流进线支路出现故障。
方法二、检测工作交流进线支路任一相或三相的交流电压值Uae低于设定值并满足设定的延时；当交流进线支路发生故障或出现电源丢失时，交流进线支路任一相或三相的交流电压值会出现幅值的降低，当任一相或三相的交流电压值Uae低于设定值并满足设定的延时可以判断为工作交流进线支路出现故障。
方法三、检测工作交流进线支路任一相或三相的交流电流值Iac低于设定值并满足设定的延时；当交流进线支路发生故障或出现电源丢失时，交流进线支路任一相或三相的交流电流值会出现幅值的降低，当任一相或三相的交流电流值Iac低于设定值并满足设定的延时可以判断为工作交流进线支路出现故障。
当检测到工作交流进线支路出现故障时，可以先将工作中的电压源换流器临时闭锁，待故障工作交流进线支路与公共连接点或母线之间的分断设备断开及另一条正常的交流进线支路与公共连接点或母线之间的分断设备合上后，再将电压源换流器解锁并恢复工作，所述将工作中的电压源换流器临时闭锁的措施有利于提高电压源换流器的故障穿越能力。
本发明还提供一种适用于电压源换流器的主备接入系统控制装置，如图4所示，所述控制装置包括支路采集单元、主备接入常规控制单元、主备接入故障控制单元，其中：
支路采集单元，采集各交流进线支路的电气量和分断设备的分合位数据，并进行交流频率的计算；
主备接入常规控制单元，接收支路采集单元采集的各交流进线支路数据，选择一条正常的交流进线支路作为工作支路，将该工作支路与公共连接点或母线之间的分断设备置于合位为电压源换流器提供工作电源，其余各条交流进线支路与公共连接点或母线之间的分断设备均置于分位；
主备接入故障控制单元，接收支路采集单元采集的各交流进线支路数据，当检测到工作交流进线支路出现故障时，断开该工作支路与公共连接点或母线之间的分断设备，之后选择另一条正常的交流进线支路作为工作支路并合上该工作支路与公共连接点或母线之间的分断设备。
所述主备接入故障控制单元包括故障判别子单元、主备接入控制子单元，其中：
故障判别子单元，接收支路采集单元的各交流进线支路数据，进行工作交流进线支路是否出现故障以及其余各交流进线支路是否正常的判别；如果检测到工作交流进线支路出现故障，则触发主备接入控制子单元；
主备接入控制子单元，断开该工作支路与公共连接点或母线之间的分断设备，之后选择另一条正常的交流进线支路作为工作支路并合上该工作支路与公共连接点或母线之间的分断设备。
所述故障判别子单元检测工作交流进线支路出现故障的方法包括：
方法一、检测工作交流进线支路的交流频率值与额定频率值的偏差大于设定值并满足设定的延时；
方法二、检测工作交流进线支路任一相或三相的交流电压值低于设定值并满足设定的延时；
方法三、检测工作交流进线支路任一相或三相的交流电流值低于设定值并满足设定的延时。
所述主备接入控制子单元，可以先将工作中的电压源换流器临时闭锁，待故障工作交流进线支路与公共连接点或母线之间的分断设备断开及另一条正常的交流进线支路与公共连接点或母线之间的分断设备合上后，再将电压源换流器解锁并恢复工作。
以上实施例仅为说明本发明的技术思想，不能以此限定本发明的保护范围，凡是按 照本发明提出的技术思想，在技术方案基础上所做的任何改动，均落入本发明保护范围之内。

Claims (10)

  1. 一种适用于电压源换流器的主备接入系统，所述主备接入系统包括基于全控型电力电子器件的电压源换流器、两条或两条以上交流进线支路，其特征在于：电压源换流器通过公共连接点或母线与两条或两条以上交流进线支路同时相连接，每条交流进线支路的交流电源与公共连接点或母线之间均配置至少一个分断设备。
  2. 如权利要求1所述的一种适用于电压源换流器的主备接入系统，其特征在于：所述交流进线支路的交流电源直接经过至少一个分断设备与公共连接点或母线相连接。
  3. 如权利要求1所述的一种适用于电压源换流器的主备接入系统，其特征在于：所述交流进线支路含有至少一个变压器元件，交流进线支路的交流电源经过至少一个变压器元件及至少一个分断设备与公共连接点或母线相连接，变压器元件与公共连接点或母线之间配置至少一个分断设备。
  4. 一种适用于电压源换流器的主备接入系统控制方法，其特征在于：选择一条正常的交流进线支路作为工作支路，将该工作支路与公共连接点或母线之间的分断设备置于合位为电压源换流器提供工作电源，其余各条交流进线支路与公共连接点或母线之间的分断设备均置于分位；当检测到工作交流进线支路出现故障时，断开该工作支路与公共连接点或母线之间的分断设备，之后选择另一条正常的交流进线支路作为工作支路并合上该工作支路与公共连接点或母线之间的分断设备。
  5. 如权利要求4所述的一种适用于电压源换流器的主备接入系统控制方法，其特征在于，所述检测工作交流进线支路出现故障的方法包括：
    方法一、检测工作交流进线支路的交流频率值与额定频率值的偏差大于设定值并满足设定的延时；
    方法二、检测工作交流进线支路任一相或三相的交流电压值低于设定值并满足设定的延时；
    方法三、检测工作交流进线支路任一相或三相的交流电流值低于设定值并满足设定的延时。
  6. 如权利要求4所述的一种适用于电压源换流器的主备接入系统控制方法，其特征在于：当检测到工作交流进线支路出现故障时，先将工作中的电压源换流器临时闭锁，待故障工作交流进线支路与公共连接点或母线之间的分断设备断开及另一条正常的交流进线支路与公共连接点或母线之间的分断设备合上后，再将电压源换流器解锁并恢复 工作。
  7. 一种适用于电压源换流器的主备接入系统控制装置，其特征在于，所述控制装置包括：支路采集单元、主备接入常规控制单元、主备接入故障控制单元，其中：
    支路采集单元，采集各交流进线支路的电气量和分断设备的分合位数据，并进行交流频率的计算；
    主备接入常规控制单元，接收支路采集单元采集的各交流进线支路数据，选择一条正常的交流进线支路作为工作支路，将该工作支路与公共连接点或母线之间的分断设备置于合位为电压源换流器提供工作电源，其余各条交流进线支路与公共连接点或母线之间的分断设备均置于分位；
    主备接入故障控制单元，接收支路采集单元采集的各交流进线支路数据，当检测到工作交流进线支路出现故障时，断开该工作支路与公共连接点或母线之间的分断设备，之后选择另一条正常的交流进线支路作为工作支路并合上该工作支路与公共连接点或母线之间的分断设备。
  8. 如权利要求7所述的一种适用于电压源换流器的主备接入系统控制装置，其特征在于，所述主备接入故障控制单元包括故障判别子单元、主备接入控制子单元；
    故障判别子单元，接收支路采集单元的各交流进线支路数据，进行工作交流进线支路是否出现故障以及其余各交流进线支路是否正常的判别，如果检测到工作交流进线支路出现故障，则触发主备接入控制子单元；
    主备接入控制子单元，断开该工作支路与公共连接点或母线之间的分断设备，之后选择另一条正常的交流进线支路作为工作支路并合上该工作支路与公共连接点或母线之间的分断设备。
  9. 如权利要求8所述的一种适用于电压源换流器的主备接入系统控制装置，其特征在于，所述故障判别子单元检测工作交流进线支路出现故障的方法包括：
    方法一、检测工作交流进线支路的交流频率值与额定频率值的偏差大于设定值并满足设定的延时；
    方法二、检测工作交流进线支路任一相或三相的交流电压值低于设定值并满足设定的延时；
    方法三、检测工作交流进线支路任一相或三相的交流电流值低于设定值并满足设定的延时。
  10. 如权利要求8所述的一种适用于电压源换流器的主备接入系统控制装置，其特 征在于：所述主备接入控制子单元，先将工作中的电压源换流器临时闭锁，待故障工作交流进线支路与公共连接点或母线之间的分断设备断开及另一条正常的交流进线支路与公共连接点或母线之间的分断设备合上后，再将电压源换流器解锁并恢复工作。
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