基于近似熵算法在单相接地故障定位中的研究

采用MATLAB搭建单相接地仿真模型,并采用近似熵法判别故障区段。首先沿着线路模型设置多个检测点,然后分别求取各检测点的近似熵。利用故障点前后暂态零序电流波形的差异,进而求取的近似熵值的不同来判定故障区段。该方法具有不需要不同检测点的精确时间同步,所需数据量小等优点。

Research on Approximate Entropy Algorithm for Single phase Grounding Fault Location

This article builds a single-phase grounding simulation model based on the MATLAB, and uses the approximate entropy methoO to judge single-phase grounding fauh section. First of all, along the line model it sets a number of monitoring points, and then calculates each control points using the approximate entropy respectively. Using the difference of transient zero sequence current waveforms before and after fault points, and then calculating the approximate entropy value at all points, the fault location will be judged. This method does not need time synchronization at different monitoring points, and need only small amount of data.