HVDC换流站换流器桥差保护动作行为的仿真分析  

Simulation analysis of action behaviors for bridge differential protection in HVDC converter station

作　　者：翁汉琍[1] 李雪华[1] 潘本仁[2] 杨国稳 

机构地区：[1]三峡大学电气与新能源学院,湖北宜昌443002 [2]国家电网江西省电力科学研究院,江西南昌330096

出　　处：《电力科学与技术学报》2015年第4期34-39,共6页Journal of Electric Power Science And Technology

基　　金：三峡大学人才科研启动基金(KJ2014B043)

摘　　要：对高压直流输电工程在运行中发生的换流站换流器桥差保护异常动作情况进行阐述与分析。基于PSCAD/EMTDC平台建模,在多种故障情况下对桥差保护动作情况进行仿真分析,在此基础上,剖析换流器桥差保护异常动作的原因。PSCAD仿真结果表明:△桥、Y桥阀侧电流互感器(TA)采样值存在故障电流差值,桥差保护才能正确动作;若故障电流同时流入或同时不流入△桥、Y桥TA,桥差保护将发生拒动。The abnormal action situation on converter bridge differential protection of the HVDC （high voltage direct current） system were explained and analyzed in this paper. Based on the PSCAD/EMTDC model, the simulation on action behavior of the bridge differential protection was carried out under various fault conditions and the reasons for the abnormal action of bridge differential protection were analyzed. The PSCAD simulation results show that a fault current difference exists between the sampled values of current transformers （TA） on the △ bridge and Y bridge of the valve side, the bridge differential protection can operate correctly. When the fault current flows simultaneously, or doesn＇t flow, into the TAs on the △ bridge and Y bridge of the valve side, the bridge differential protection will maloperation.

关 键 词：HVDC 换流变 换流器 桥差保护 

分 类 号：TM771[电气工程—电力系统及自动化]