基于主频分量相关性的谐振接地配电网故障定位方法

摘要

针对结构复杂的谐振接地配电网,基于相关性的故障定位算法具有判别裕度较小,易发生误判.依据主频分量故障边界明显的特点,提出一种基于主频分量相关性的谐振接地配电网故障定位方法.首先,对各检测点的零序电流纯故障分量进行滤波,通过Prony算法从各馈线纯故障分量中提取主频分量;然后,分析各相邻检测点的零序电流主频分量之间的相关性,其中相关系数为负所对应的相邻检测点区段为故障区段.仿真分析表明:该方法受故障位置、故障电阻、故障合闸角影响较小,且故障判别裕度较高,不易发生误判,适合结构较复杂的谐振接地配电网故障判别.%The fault discrimination margin of fault location method by using the waveform correlation is small for a res-onant grounding distribution system with complex structure,and it is easy to mis-judgement.Because the fault boundary of the main frequency component was obvious,a fault location method based on the waveform correlation of the main frequency component was presented in this paper.First,the main frequency component was extracted by Prony,and then the zero sequence current of pure fault component was filtered.The waveform correlation between the two neighboring detecting points was analyzed.The section was fault section if the waveform correlation coefficient between two neighboring detecting points was negative.The simulation results show that the method is not influence by the fault location,fault resistance,and the initial angle of the fault.The fault margin of the method is higher,thus the method is suitable for the fault line selection of the complicated distribution network.