云广_800kV特高压直流工程逆变站最后断路器跳闸故障研究.pdfVIP

第 32 卷 第 18 期 电 网 技 术 Vol. 32 No. 18 2008 年 9 月 Power System Technology Sep. 2008 文章编号：1000-3673 （2008 ）18-0006-04 中图分类号：TM711 文献标志码：A 学科代码：470·4051 云广±800 kV 特高压直流工程 逆变站最后断路器跳闸故障研究 王华伟，蒋卫平，吴娅妮，李刚 （中国电力科学研究院，北京市海淀区 100192 ） Study on Last Break Trip Fault of Inverter Station in ±800 kV UHVDC Project From Yunnan to Guangdong WANG Hua-wei ，JIANG Wei-ping ，WU Ya-ni ，LI Gang （China Electric Power Research Institute，Haidian District ，Beijing 100192 ，China ） ABSTRACT: The last breaker trip of inverter station, i.e., the 关键词：特高压直流；最后断路器跳闸；过电压 load shedding of AC system at inversion side, will lead to 0 引言 severe over-voltage at converter bus and equipments in DC side, so it is one of the major faults to be considered in the research 换流站交流侧过电压主要由各种操作、故障或 on DC over-voltage and insulation coordination. By means of 雷击引起，其中操作或故障引起的内过电压对设备 simulation, the authors research the over-voltage level at AC 绝缘水平的选取起决定性作用[1-2] 。目前我国端对端 and DC sides of converter station as well as arrestor operation 直流输电和背靠背直流联网工程中，受端换流站一 condition caused by last breaker trip occurred in inverter station 般通过 2 条或数条交流线路接入受端系统，如三 of UHVDC power transmission project from Yunnan to 峡—常州、三峡—广州、灵宝背靠背直流联网工程 Guangdong; analyze and reveal the interrelations among 等，如果在无短路故障条件下失去最后一条交流线 over-voltage level, various operation conditions and different 路，造成无交流甩负荷，则称之为最后断路器跳闸。 action delay of DC protections and propose the requirement to 最后断路器跳闸后，由于逆变站换流母线上连接的 the time of protection coordination to ensure secure and reliable