±800 kV特高压多端直流系统换流阀过电压机理及影响因素研究  

Study on Overvoltage Mechanism and Influencing Factors of Converter Valves in ±800kV Multi-terminal UHVDC System

作　　者：聂男峰 王磊 王东举[1] 南君培 李卓然 陈向荣 周浩[1] NIE Nanfeng;WANG Lei;WANG Dongju;NAN Junpei;LI Zhuoran;CHEN Xiangrong;ZHOU Hao(College of Electrical Engineering,Zhejiang University,Hangzhou 310027,Zhejiang Province,China;China Electric Power Research Institute,Wuhan 430072,Hubei Province,China)

机构地区：[1]浙江大学电气工程学院,浙江省杭州市310027 [2]中国电力科学研究院有限公司,湖北省武汉市430072

出　　处：《电网技术》2020年第1期307-315,共9页Power System Technology

基　　金：国家电网公司科技项目(特高压多端直流输电电磁暂态与绝缘配合关键技术)资助(EPRIGYKJ[2016]1557)~~

摘　　要：换流阀过电压严重影响特高压多端直流系统安全稳定运行,而目前缺少对特高压多端直流系统过电压的研究,对换流阀过电压机理和影响因素进行分析具有重要意义。基于PSCAD/EMTDC平台对比分析并联型四端直流系统与两端直流系统换流阀不同避雷器V1、V2、V3所承受最严酷过电压情况。对两端系统和四端系统过电压仿真结果不一致的避雷器V1、V3进行深入过电压机理分析,并通过仿真进行验证。研究了故障发生时刻、非故障整流站的能量注入、线路长度和系统结构对阀过电压的影响。研究结果可为特高压多端直流系统工程设计提供参考。The overvoltage of converter valves seriously affects safety and stability of multi-terminal DC system.However,there is lack of research on overvoltage of multi-terminal DC system at present.It is of great significance to study the overvoltage mechanism and influencing factors of converter valves.This paper compares the overvoltages of parallel four-terminal DC system and two-terminal DC system when converter valve arresters V1,V2 and V3 are under their most severe operating conditions based on PSCAD/EMTDC platform.Due to inconsistency of overvoltage results between two-terminal system and four-terminal system,the overvoltage mechanisms of V1 and V3 arresters are analyzed in-depth and validated with simulation.This paper studies the influence of fault time,energy injection of non-fault rectifier station,line length and system structure on overvoltages of converter valves.The research results provide reference for engineering design of multi-terminal UHVDC system.

关 键 词：端直流输电 暂态过电压 换流阀避雷器 影响因素 

分 类 号：TM721[电气工程—电力系统及自动化]