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电网技术  2015 

基于欧氏距离法的换流变压器短路电流和励磁涌流的辨识

DOI: 10.13335/j.1000-3673.pst.2015.09.045, PP. 2671-2676

Keywords: 换流变压器,差动保护,励磁涌流,2次谐波

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Abstract:

在高压直流(high-voltagedirectcurrent,HVDC)输电系统中,换流变压器受各种交直流滤波器影响,发生不对称故障时,差动电流中2次谐波含量比较大。通过仿真分析可知,采用2次谐波制动时,某些故障情况下保护会发生拒动。经分析,励磁涌流波形具有间断和偏向时间轴一侧的特征,而故障时的差动电流在不计直流分量影响的情况下,其波形分布时间轴两侧且无间断角。据此,提出利用变压器二次出口采样电流与标准正弦曲线之间的欧氏距离来鉴别励磁涌流和故障电流。通过EMTDC进行了大量的仿真实验,验证了该判据的稳定性和有效性。

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