基于输电网中故障行波分布和网络依赖图的故障定位算法

由于传统双端行波定位方法用于整个电网故障定位存在着一些不足,故笔者分析了电网系统结构特点,在双端行波定位的基础上,提出了一种依赖图的高压电网输电线路故障定位方法。该方法依据电网对象间的告警关联关系构建相应网络依赖图,当电网内某条线路发生故障后,每个变电站定位装置均记录下电压行波到达该站的时刻,通过分析各站时间信息,首先在电网中判断出故障线路,然后结合依赖图中最优有序对,计算得出故障点的准确位置。运用该方法对故障仿真实例进行了分析,仿真结果表明了方法的可行性。

A Fault Location Method of High Voltage Grid Transmission Line Based on Overvoltage Online Monitoring Signal

With the continuous development of high voltage grid in scale,the conventional fault location method based on single line cannot satisfy requirement of fault location for whole grid.Adopting the two-terminal traveling wave location,this paper presents a graph dependent method of fault location on high voltage grid transmission lines on the basis of the over-voltage on-line monitoring signals and the systematic structure of grid.In this method,a dependency graph is built according to the alarm association relationship among all grid objects,and when a fault occurs on a transmission line in the grid,the voltage traveling wave arrival time is recorded by location device in each substation.Thereby the fault line can be found firstly according to the recorded data,and then the exact location of the fault can be calculated by combining the optimal ordered pair.The feasibility of this method is verified by simulations of real faults.