基于在线计算线路分布参数的故障定位方法

为了提高测距精度,提出了一种不需要双端电压电流同步测量的分布参数模型故障测距算法。该算法根据故障后沿线电压的分布规律,在不要求双端数据同步时,利用线路两端故障前电压和电流相量在线计算线路参数;使用一维搜索方法算出故障点的位置,其具体测距算法是采用前置带通滤波器与全波傅氏算法相结合的滤波算法以提取相当精确的基频分量。仿真计算表明,该算法估算线路参数和故障距离较准确,无需解长线方程,且不受故障类型、线路参数变化和系统运行方式、过渡电阻等因素影响。

Fault Location Based on On-line Computation of the Transmission Line Distributed Parameters

In order to improve the accuracy of measuring the distance,a new approach to fault location based on distributed parameter model,whose voltages and currents of the two ends of the transmission line do not need to be measured synchronously,is presented in this paper.The algorithm uses one dimension search method to look for the faulty position according to regularities of voltage distribution along the transmission line after the fault.Then the line parameters can be on-line computed by both the voltages and the currents of the two ends of transmission line before the fault.The DFT based filter combined with a bandpass filter helps extract extremely accurate fundamental frequency components for calculation of fault location.A lot of simulation results by the Matlab and real data validation show that this algorithm is not only of high accuracy and robustness,but also not affected by fault resistance,fault type,fault location and incidence angle of the fault occurrence.The algorithm does not require a long-term solution equation and small amount of calculation.