基于MMC的多端柔性直流线路超高速保护关键技术研究  

Research on key technology of ultra-high speed protection of flexible multi-terminal DC line based on MMC

作　　者：李传西 黄金海 田培涛 付艳 杨泽松 Li Chuanxi;Huang Jinhai;Tian Peitao;Fu Yan;Yang Zesong(XJ Electric Co.,Ltd.,Xuchang 461000,He′nan,China;Jishou Electric Power Company,Jishou 416000,Hu′nan,China)

机构地区：[1]许继电气股份有限公司,河南许昌461000 [2]吉首供电公司,湖南吉首416000

出　　处：《电测与仪表》2020年第2期57-61,94,共6页Electrical Measurement & Instrumentation

基　　金：国家重点研发计划项目(2016YFB0900600);国家电网公司科技项目(52094017000W)

摘　　要：为了满足多端柔性直流电网输电线路超高速保护动作快速需求,在传统直流线路保护的基础上,介绍了柔性直流线路的保护配置和动作策略,根据故障行波的特征,提出了一种行波保护方法。该方法将电压信号经过S变换提取故障行波的特定频带特性,通过对不同时刻故障行波幅值的变化识别接地短路故障,进而构成行波保护出口的判据。最后基于实际工程参数,在RTDS搭建的多端柔性直流仿真模型与控制保护系统构成的闭环系统上进行试验验证,试验结果表明该方法有效、可靠。In order to meet the requirements of ultra-high-speed protection action of multi-terminal flexible DC grid transmission lines,based on the traditional DC line protection,the protection configuration and action strategy of flexible DC line are introduced. According to the characteristics of fault traveling wave,a traveling wave protection method is proposed in this paper. The method extracts the specific frequency band characteristics of the fault wave by S-transform,and identifies the ground short circuit fault by changing the amplitude of the fault traveling wave at different times,thereby,forming a criterion for the traveling wave protection exit. Finally,based on the actual engineering parameters,the multi-terminal flexible DC simulation model built by RTDS and the closed-loop system composed of control and protection system are tested. The test results show that the proposed method is effective and reliable.

关 键 词：MMC 行波保护 S变换 RTDS 

分 类 号：TM773[电气工程—电力系统及自动化]