配置HSS的并联多端高压直流输电线路保护选择性研究  

Line protection selectivity of the parallel multi-terminal HVDC with HSS

作　　者：王杨正[1] 杨建明[1] 鲁江[1] 俞翔 赵文强[1] 张庆武[1] WANG Yangzheng;YANG Jianming;LU Jiang;YU Xiang;ZHAO Wenqiang;ZHANG Qingwu(NR Electric Co.,Ltd.,Nanjing 211102,China)

机构地区：[1]南京南瑞继保电气有限公司

出　　处：《电力工程技术》2020年第1期95-102,共8页Electric Power Engineering Technology

基　　金：国家重点研发计划资助项目(2016YFB0900600);国家电网有限公司科技项目(52094017000W)

摘　　要：文中综述了并联多端直流线路保护的研究现状,基于并联多端直流主回路拓扑,提出了配置直流高速隔离开关(HSS)的并联多端直流的线路保护配置方案。为解决配置HSS的并联多端直流线路主保护选择性问题,对现有的多端线路主保护存在选择性盲区的原因进行分析,并提出一种新的线路保护策略:将线路主保护分为2段,通过定值配合和新增保护辅助判据策略,解决了通信正常和通信故障下线路主保护选择性问题。通过RTDS仿真系统试验,验证了提出的线路保护策略能有效区分线路区内故障和区外故障,解决选择性问题,实现了某一线路全长范围内发生永久故障时无需多端直流全停,只需隔离故障线路而剩余线路可继续运行,可应用于配置HSS的并联多端直流输电系统中。This paper reviews the research status of existing parallel multi-terminal HVDC line protection,based on the topology of parallel multi-terminal HVDC system with HSS configuration,the line protection configuration scheme is proposed.In order to solve the selectivity problem of parallel multi-terminal HVDC line protection,the reason for the selective blind area of the existing multi-terminal main protection is analyzed in depth.It puts forward a new line protection method,line protection is divided into two segments,through adjusting protection setting value and adding auxiliary strategy,the selectivity problem under normal and faulty COM munication is solved.Finally,RTDS simulation tests prove that the proposed line protection method can effectively distinguish the faults within or outside the area and solve the selectivity problem,when a permanent fault occurs on one line in parallel multi-terminal HVDC system with HSS configuration,all HVDC terminals are not necessary to be stopped,only the fault line needs to be isolated and the remaining lines can continue to run.This proposed line protection method is suitable for parallel multi-terminal HVDC project with HSS.

关 键 词：并联多端高压直流输电 主回路拓扑 线路保护 选择性 直流高速隔离开关 

分 类 号：TM723[电气工程—电力系统及自动化]