一种实现柔直系统快速恢复的自取能故障阻尼器  

Self-powered fault damper for realizing fast recovery of VSC-HVDC system

作　　者：谢晔源[1] 曹冬明[1] 李继红[2] 朱铭炼[1] 姜田贵[1] 连建阳[1] 

机构地区：[1]南京南瑞继保电气有限公司,江苏南京211002 [2]国网浙江省电力公司,浙江杭州310007

出　　处：《电力自动化设备》2017年第7期142-147,154,共7页Electric Power Automation Equipment

基　　金：国家电网公司科技项目(5211DS16000C)~~

摘　　要：针对半桥模块化多电平换流器(MMC)的直流双极短路和单桥臂短路2种典型故障工况,分析了其故障通路和电流波形,并提出相应的桥臂阻尼方案,推导了阻尼电阻的设计依据。提出一种新型自取能模块化故障阻尼器拓扑,分析了其工作模式以及对MMC的影响。该阻尼器串联在MMC的桥臂中,解决了高电位取能问题,实现了阻尼器的自取能,在直流双极短路故障时起到限流和衰减作用,加快故障端的切除,实现柔直系统的快速恢复;在单桥臂短路故障时可以衰减阀侧交流电流的直流分量,有助于阀侧交流开关的跳开。结合工程上使用的MMC结构,提出了即插即用的模块化故障阻尼器实施方案。在舟山五端柔直仿真系统中验证了所提自取能模块化故障阻尼器拓扑的有效性。The fault path and current waveform of half-bridge MMC（Modular Multi-level Converter） are analyzed for two typical faults：DC bipolar short circuit and single-arm short circuit,a corresponding bridgearm damping scheme is proposed and the design rule of its damping resistor is deduced. A topology of self-powered modular fault damper is proposed,its operating modes are presented and its influence on MMC is analyzed. The fault damper is inserted in the bridge arm of MMC to power itself at high potential,which limits and damps the fault current during the DC bipolar short circuit to speed up the trip of faulty terminal for the fast recovery of VSC-HVDC system;while it decays the DC component of valve-side AC during the single-arm short circuit to speed up the trip of valve-side AC switch. A plugand-play scheme of modular fault damper is proposed according to the structure of MMC applied in project. Zhoushan five-terminal VSC-HVDC simulation system is used to verify the effectiveness of the proposed topology of self-powered modular fault damper.

关 键 词：模块化多电平换流器 快速恢复 直流双极短路 单桥臂短路 自取能 故障阻尼器 

分 类 号：TM46[电气工程—电器]