±800kV特高压直流换流器在线投入失败案例分析  

Case Analysis of ±800kV UHVDC Converter On-Line Deblocking Failure

作　　者：李国栋 陈龙翔 金一丁 李增辉 董昱 胡超凡 葛睿 

机构地区：[1]国家电力调度控制中心,北京100031

出　　处：《电力与能源》2015年第2期218-222,共5页Power & Energy

摘　　要：针对一起±800kV特高压直流单换流器在线投入失败事件展开分析,详细介绍换流器在线投入过程的基础上,分析投入失败原因与交流系统短路电流、母线电压密切相关。基于实时数字仿真(RTDS)对其投入过程复现与讨论,重点分析换流器投入失败原因及其过程对近区交流电网的影响,论证了不同输送功率、不同短路电流、不同换流器运行个数等方式下的特高压直流单换流器在线投入情况。仿真结果表明,同等条件下,输送功率(运行电流)越大、短路电流越小、在运换流器越少,越不利于换流器在线投入。从调度运行、电网规划、直流控制保护系统等几个方面提出相关建议。This paper presents one on-line deblocking failure event of ＋800 kV UHVDC converter. Based on the detailed introduction of converter onTline deblocking process, it analyzed the close correlation of the deblocking failure with AC system short-circuit current and bus voltage level, and then repeated and discussed the on-line deblocking process based on real time digital simulation （RTDS）. Emphasis was laid on the influence of converter deblocking failure process to the nearby AC grid, as well as the UHVDC converter on-line deblocking under different transmission power, different short-circuit current and different converter operation number modes. Simulation results show that, under the same conditions, the more power or running current, the smaller short-circuit current and less converters in operation, which is not conducive to converter on-line deblocking. Finally, some related research proposals and ideas are put forward from the aspects of dispatching operation, power grid planning, DC control and protection system, etc.

关 键 词：特高压直流 换流器 在线投入 短路电流 无功消耗 

分 类 号：TM723[电气工程—电力系统及自动化]