分布式配电网故障行波定位方法

A fault location method for distributed power distribution networks based on traveling wave

针对配电网结构复杂、线路分支多、故障定位困难的问题,分析故障行波零线模分量传输波速的差异,据此提出一种基于行波模量时间差的分布式配电网故障定位方法。该方法选取部分配变终端安装行波采集装置,在配网不同位置设置模拟故障点,模拟故障点产生的故障行波传输到各采集装置的时刻构建基准线模行波时差矩阵;当实际发生故障时,按相同规则形成故障行波时差数组与基准矩阵的比较得出故障点所在区间,再利用故障点零线模行波分量到达测量端时差不同的特性,通过迭代算法准确得到故障点在区间中的位置。仿真结果表明,该方法可以准确判断故障发生在主干线路和分支线路区段中的具体位置,定位误差小于150m。

The complex distribution network has many branches.It is difficulty to locate the fault point.Based on the travelling wave velocity difference between the zero and aerial mode components,a fault location method was proposed for distribution networks in this paper.Only several fault locators were installed to record the traveling wave arrival times in the distribution network.The standard array of arrival time difference between the zero and aerial mode components was built with different fault pointsimulations.When the actual fault happened,the actual arrival time difference was compared with each element of the standard array to judge the faulted section.The fault point could be located using the relationship the time difference.The simulation resultsshow that this method has high locating accuracy with error less than 150 m.