天广直流系统中性母线过电压机制研究  

Study on Neutral-Bus Overvoltage Mechanism of ±500 kV DC Power Transmission Project From Tianshengqiao to Guangdong

作　　者：袁士超[1] 王东举[1] 陈锡磊[1] 黄志岭[2] 卢宇[2] 田杰[2] 陈文翰[3] 孙可[4] 周浩[1] 

机构地区：[1]浙江大学电气工程学院,浙江省杭州市310027 [2]南京南瑞继保电气有限公司,江苏省南京市211102 [3]浙江省电力试验研究院,浙江省杭州市310014 [4]浙江省电力公司,浙江省杭州市310027

出　　处：《电网技术》2011年第5期216-222,共7页Power System Technology

基　　金：国家重点基础研究发展计划项目(973项目)(2011CB-209405)~~

摘　　要：基于天广±500 kV高压直流输电系统工程改造后的控制和保护策略,研究了各种故障下中性母线过电压的情况,将不同故障下的过电压过程分为几个阶段进行分析,阐述各阶段故障电流流向和过电压机制。研究结果表明,换流变阀侧出线和换流桥出线接地故障引起的通过中性母线E避雷器的能量不能由控制和保护系统进行控制,中性母线E避雷器必须有足够的流通容量;直流系统回路断线故障引起的通过中性母线E避雷器能量随控制保护动作时延的缩短而减小。Based on post-innovation control and protection strategies for ±500 kV DC power transmission project from Tianshengqiao to Guangdong, the overvoltages of neutral-bus under various fault conditions are researched and the overvoltage processes under different fault conditions are divided into several stages for the detailed analysis, and the overvoltage mechanism as well as the current direction during various stages are expounded. Research results show that the energy flowing through neutral-bus arrester due to the grounding faults respectively occurred at outgoing line of valve side Of converter transformer and that occurred at outgoing line of rectifier bridge cannot be controlled by the control and protection system, so the neutral-bus arrester has to exist enough adequate energy capability; the energy flowing through neutral-bus arrester due to the break fault occurred in DC system can be reduced while the time-delay of protection action is shortened.

关 键 词：天广直流工程 PSCAD/EMTDC 过电压机制 中性母线避雷器 紧急停运 闭锁 

分 类 号：TM86[电气工程—高电压与绝缘技术]