电力系统自动化
電力繫統自動化
전력계통자동화
Automation of Electric Power Systems
2015年
20期
158-167
,共10页
刘剑%邰能灵%范春菊%黄文焘
劉劍%邰能靈%範春菊%黃文燾
류검%태능령%범춘국%황문도
柔性直流输电%系统结构%故障特征%故障处理%直流线路保护
柔性直流輸電%繫統結構%故障特徵%故障處理%直流線路保護
유성직류수전%계통결구%고장특정%고장처리%직류선로보호
voltage source converter based high voltage direct current (VSC-HVDC)%system structure%fault characteristic%fault handling%DC line protection
由于柔性直流输电系统调节方式和自身结构的特殊性，直流线路的故障电流具有上升速度快、峰值大的特点，极易损坏换流器件和设备绝缘，且柔性直流系统无法通过调节触发角实现故障自清除。因此，对直流线路故障处理和保护提出了更高要求。对于柔性直流线路故障，不仅需要快速且可靠的线路保护对故障进行识别，也需要相应的处理措施和手段对故障后的电流进行有效限制，以减少故障冲击电流对换流器件、直流线路自身以及系统的损害。基于柔性直流输电线路的故障特征，从直流线路故障电流抑制、减少故障影响、线路保护原理等方面，系统地介绍了国内、国外柔性直流输电线路故障处理与保护技术的现状和发展。重点分析了几种辅助电路、新型换流器拓扑和直流输电结构，以及直流断路器在处理直流线路故障方面的性能。探讨了目前柔性直流输电线路故障处理和保护亟须解决的关键问题以及未来进一步的研究方向。
由于柔性直流輸電繫統調節方式和自身結構的特殊性，直流線路的故障電流具有上升速度快、峰值大的特點，極易損壞換流器件和設備絕緣，且柔性直流繫統無法通過調節觸髮角實現故障自清除。因此，對直流線路故障處理和保護提齣瞭更高要求。對于柔性直流線路故障，不僅需要快速且可靠的線路保護對故障進行識彆，也需要相應的處理措施和手段對故障後的電流進行有效限製，以減少故障遲擊電流對換流器件、直流線路自身以及繫統的損害。基于柔性直流輸電線路的故障特徵，從直流線路故障電流抑製、減少故障影響、線路保護原理等方麵，繫統地介紹瞭國內、國外柔性直流輸電線路故障處理與保護技術的現狀和髮展。重點分析瞭幾種輔助電路、新型換流器拓撲和直流輸電結構，以及直流斷路器在處理直流線路故障方麵的性能。探討瞭目前柔性直流輸電線路故障處理和保護亟鬚解決的關鍵問題以及未來進一步的研究方嚮。
유우유성직류수전계통조절방식화자신결구적특수성，직류선로적고장전류구유상승속도쾌、봉치대적특점，겁역손배환류기건화설비절연，차유성직류계통무법통과조절촉발각실현고장자청제。인차，대직류선로고장처리화보호제출료경고요구。대우유성직류선로고장，불부수요쾌속차가고적선로보호대고장진행식별，야수요상응적처리조시화수단대고장후적전류진행유효한제，이감소고장충격전류대환류기건、직류선로자신이급계통적손해。기우유성직류수전선로적고장특정，종직류선로고장전류억제、감소고장영향、선로보호원리등방면，계통지개소료국내、국외유성직류수전선로고장처리여보호기술적현상화발전。중점분석료궤충보조전로、신형환류기탁복화직류수전결구，이급직류단로기재처리직류선로고장방면적성능。탐토료목전유성직류수전선로고장처리화보호극수해결적관건문제이급미래진일보적연구방향。
Owing to the specific mode of regulation and structure of the voltage source converter-high voltage direct current (VSC-HVDC) transmission system,the DC line fault current is characterized by high increasing speed and great peak value. This is extremely susceptible to destruction of converter devices and damage to insulation of equipment.VSC-HVDC system cannot realize fault self-clearing by adjusting the firing angle.Therefore,higher requirements are made on protection and fault handling of DC transmission lines.For DC line faults,not only is reliable and fast protection needed for fault identification,but also corresponding control measures and circuit should be taken to limit the fault current and reduce the damage of the current to converter devices,the DC line itself and system.Based on the fault characteristics of VSC-HVDC transmission lines,the state of the art of DC line protection technology and prospects for application at home and abroad are described.Protection and fault handling technologies of DC lines are summarized and analyzed with respect to fault current limiting,reducing fault impact,and protection principle. The fault handling capability of several protection circuits, converter topologies, DC transmission structures and DC breakers are focused on.Finally,several key issues about protection and fault handling of VSC-HVDC transmission lines and future directions for further research demanding prompt solution are discussed.
