配电网络故障区段定位新方法

Novel Method of Fault Location for Distribution Network

针对小电流接地系统故障定位问题,提出了一种利用暂态纯故障分量的配电网故障区段定位方法。该方法在计算故障后各检测点的暂态零模功率纯故障分量近似熵值的基础上,求取出各区段的比例因子值,进而通过与主站中的阈值比较大小来判定故障位置。大量的ATP仿真表明,无论是母线故障还是分支线路区段故障,该方法均能准确判定出故障位置。另外,基于近似熵算法的故障判定方法,不需要各检测点精确时间同步,适合于实际的故障定位系统。

A novel method of fault section location using transient pure fault component of distribution network is proposed in this paper. Based on the approximate pure fault component entropy value of transient zero-mode power at every detection points after calculation, this method calculates the scale factor values of every section and then determines the fault location by comparing them with the threshold of the main station. Large a- mounts of ATP simulations show that this method can accurately determine fault points not only on the bus but also on the branch line. Besides, the fault location algorithm based on approximate entropy can be easily ap- plied in actual fault location system since it does not need to be synchronous with the exact time of every detec- tion point.