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电网技术  2014 

基于阀电压或阀电流的HVDC换相失败故障诊断

DOI: 10.13335/j.1000-3673.pst.2014.12.029, PP. 3453-3458

Keywords: HVDC,power,transmission,commutation,failure,diagnosis,valve,voltage,valve,current,extinction,angle

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Abstract:

为实现换相失败的快速准确诊断,以便及时采取有效的控制措施,减小换相失败对高压直流输电(HVDC)系统的影响,通过对换相失败机制和过程的分析,认为阀电压持续为零、阀电流持续非零并保持较高幅值可作为换相失败的本质特征,并据此提出基于阀电压或阀电流的换相失败故障诊断方法。若阀电压持续为零或阀电流持续非零的时间超过1个工频周期,可判定为HVDC发生换相失败。理论分析和仿真结果证明,该方法既可以准确有效地诊断换相失败,还可直观地显示发生换相失败的换流阀,而且原理简单,不在诊断盲区。

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