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高压直流输电系统连续换相失败研究综述
景柳铭1,2, 王宾1,2, 董新洲1,2, 王海港3, 俞斌3, 谢民3, 陈实3
1.清华大学 电机工程与应用电子技术系,北京 100084;2.清华大学 电力系统及发电设备控制和仿真国家重点实验室,北京 100084;3.国网安徽省电力有限公司,安徽 合肥 230061
摘要:
高压直流输电系统连续换相失败是引发交直流混联电网连锁故障的重要诱因,换相失败的本质原因是晶闸管没有自关断能力。因交流故障难以预测,首次换相失败难以避免,但首次换相失败演化为连续换相失败的过程受高压直流控制系统快速跳变和交流系统继电保护动作的影响。分析了高压直流连续换相失败的演化机理,介绍了判别连续换相失败的方法,归纳了连续换相失败的处理方式,并对其特点进行了分析。
关键词:  高压直流输电  单端量保护  线路保护  电压反行波  线路边界  高阻接地故障
DOI:10.16081/j.epae.201909047
分类号:TM721.1
基金项目:国家重点研发计划项目(2016YFB0900600);中国博士后科学基金资助项目(2017M620777);国家电网公司总部科技项目(SGAH0000TKJS180005)
Review of consecutive commutation failure research for HVDC transmission system
JING Liuming1,2, WANG Bin1,2, DONG Xinzhou1,2, WANG Haigang3, YU Bin3, XIE Min3, CHEN Shi3
1.Department of Electrical Engineering, Tsinghua University, Beijing 100084, China;2.State Key Laboratory of Control and Simulation of Power Systems and Generation Equipments, Tsinghua Univeristy, Beijing 100084, China;3.State Grid Anhui Electric Power Company, Hefei 230061, China
Abstract:
The cascading fault caused by consecutive commutation failures of HVDC system is a serious problem in AC/DC hybrid power grid, and the lack of self-turn-off ability for thyristors is the essential reason causes commutation failure. AC fault is difficult to predict and the initial commutation failure is inevitable, while both the rapid hop of HVDC control system and relay protection action of AC system affect the initial commutation failure evolving into consecutive commutation failure. The evolution mechanism of HVDC consecutive commutation failure is analyzed, the method to distinguish the consecutive commutation failure is demonstrated, the mitigation methods of consecutive commutation failure are summarized, and the characteristics of above methods are analyzed.
Key words:  HVDC power transmission  single-terminal protection  line protection  voltage backward traveling wave  line boundary  high-impedance grounding fault

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