CAJ | 학술논문

谐振接地系统发生单相接地故障时故障信号不易处理。为准确选出故障线路，提出一种基于EMD算法和以欧氏距离为基础的聚类算法相结合的故障选线方法。根据谐振接地系统单相接地故障后零序暂态电流的特性---故障线路的零序暂态电流幅值远大于各健全线路的零序暂态电流幅值并且极性相反，首先对各馈线暂态零序电流进行EMD分解并提取主振荡频带电流信号，然后求取各馈线主振荡频带电流信号的综合欧氏距离，以此为基础对各馈线进行排序和聚类，由聚类结果确定故障线路。仿真结果表明，该方法准确、可靠。
해진접지계통발생단상접지고장시고장신호불역처리。위준학선출고장선로，제출일충기우EMD산법화이구씨거리위기출적취류산법상결합적고장선선방법。근거해진접지계통단상접지고장후령서잠태전류적특성---고장선로적령서잠태전류폭치원대우각건전선로적령서잠태전류폭치병차겁성상반，수선대각궤선잠태령서전류진행EMD분해병제취주진탕빈대전류신호，연후구취각궤선주진탕빈대전류신호적종합구씨거리，이차위기출대각궤선진행배서화취류，유취류결과학정고장선로。방진결과표명，해방법준학、가고。
The single-phase-to-ground fault signal is not processed easily in resonant earthed system. In order to choose the fault feeder accurately,a new method of detection based on the empirical mode decomposition (EMD) and the cluster-algorithm that based on Euclidean distance is proposed. According to the characteristic of zero se-quence transient current of resonant earthed system with single-phase-to-ground fault:the zero sequence transient current amplitude of the fault feeder is much larger than the perfect feeders',and the current polarity is opposite between the fault feeder and the perfect feeders;first,the zero sequence transient current of the feeder is decom-posed with EMD to get its main oscillation frequency current,and then the comprehensive Euclidean distance of the main oscillation frequency current is calculated to sort and cluster the feeders ,so the fault feeder can be detec-ted by cluster-algorithm. The simulation results show that the method is reliable and accurate.