基于近似熵算法的单相接地故障定位研究

Study of Single-Phase Grounding Fault Location Based on Approximate Entropy Algorithm

采用Matlab搭建单相接地仿真模型,设置多个检测点,用近似熵算法求取各检测点的近似熵。由于故障点前后暂态零序电流波形的差异,导致近似熵值的不同,据此可以判定故障区段。该方法具有不需要不同检测点精确时间同步,所需数据量小等优点。

A simulation model the lines, then calculates their of single-phase grounding is built by Matlab, and sets some monitoring sites along approximate entropy （ApEn） values. Owing to the disparate waveforms of the transient zero ordinal inflow and outflow current, which leads to the disparity of ApEn values at monitoring sites in front and behind of the fault point, the fault section could be ascertained. The algorithm requires synchronization of monitoring sites and demands small amount of data.