CAJ | 학술논문

多端高压直流输电（HVDC）系统保护动作后故障处理策略的选择与多端系统结构密切相关。详细分析了串联型和并联型多端直流输电系统的闭锁和线路故障再启动逻辑2类保护动作后故障处理策略，并简要介绍了其他保护动作处理策略。快速移相及同时投旁通对是串联型常用的闭锁策略；并联型常采用闭锁脉冲策略，以及禁止投旁通对策略。对串联型而言，极隔离实际上是换流器隔离；由于存在多条多电压等级的直流线路，从而线路故障处理策略复杂度很高；功率回降和极平衡需各主控站协同处理；新增合大地回线开关的处理策略。对并联型而言，线路故障处理需各整流站协同处理；新增降电流后闭锁策略；新增分断直流线路开关策略，便于隔离故障直流线路。
다단고압직류수전（HVDC）계통보호동작후고장처리책략적선택여다단계통결구밀절상관。상세분석료천련형화병련형다단직류수전계통적폐쇄화선로고장재계동라집2류보호동작후고장처리책략，병간요개소료기타보호동작처리책략。쾌속이상급동시투방통대시천련형상용적폐쇄책략；병련형상채용폐쇄맥충책략，이급금지투방통대책략。대천련형이언，겁격리실제상시환류기격리；유우존재다조다전압등급적직류선로，종이선로고장처리책략복잡도흔고；공솔회강화겁평형수각주공참협동처리；신증합대지회선개관적처리책략。대병련형이언，선로고장처리수각정류참협동처리；신증강전류후폐쇄책략；신증분단직류선로개관책략，편우격리고장직류선로。
The fault clearing actions for multi-terminal high-voltage direct current （HVDC） power transmission protection system are relative to the structure of multi-terminal HVDC system. Two fault clearing actions （blocking and restart logic of line fault） are analyzed in detail for a series type and a parallel type multi-terminal HVDC system. Other fault clearing actions are also introduced. Fast retarding with setting bypass pair is a general blocking action for the series type multi-terminal HVDC system. Blocking firing pulse is a general blocking action, and inhibiting bypass pair is often used in the parallel type multi- terminal HVDC system. For the series type multi-terminal HVDC system, pole isolating is adopted instead of converter isolating. Because there are many DC lines with different voltages, it is very complex to implement restart logic for DC line to ground faults. Runback and pole balancing must be implemented in all master converters synchronously. A new fault clearing action by closing the ground return breaker is used. For a parallel type multi-terminal HVDC system, it is only to make the time of initiating restart logic and the settings of restart logic almost identical in all converters. Decreasing DC current and blocking is a new fault clearing action. A new fault clearing action named opening DC line breaker is to isolate a faulted DC line.