高压直流输电工程换相失败研究

Research on HVDC Transmission Project Commutation Failure

晶闸管换流阀在逆变工作模式时,对连接换流阀的交流系统、直流系统以及换流阀自身的状态要求比较严苛。当逆变侧出现换相失败时,换流阀会承受较大的电流应力,同时也会产生交流系统频率跌宕、直流侧电流陡增等现象。韩国济州高压直流输电工程在调试过程中多次发生的换相失败现象,文中从换相失败发生机理出发,通过现场试验研究和模拟故障现象仿真等方法综合分析,确定出故障发生原因并有效解决了换相失败问题,满足工程运行要求。

When a thyristor valve works in inverting mode, strict conditions are required for the AC and DC systems connecting with the valve, and for the state of the valve itself. When phase change failure happens in the inverting side,the valve will endure larger current stress, also frequency fluctuation of the AC system and current surge at DC side will occur. Commutation failure phenomenon has occurred many times in the debugging process of South Korea Jeju HVDC transmission project.This paper from the commutation failure theory, through comprehensive analysis of field test results and simulation of fault phenomena simulation methods, determine the fault point and effectively solve the commutation failure problem, satisfy the engineering ooerational reouirements.