基于时域有限差分法的输电线路精

传统的故障分析法多采用集中参数模型，无法反映真实线路的分布参数特性。因而，当线路较长时，这些算法不再能满足实际工程应用的精度要求。本文采用分布参数模型，直接利用有限差分法求取线路波动方程的数值解，并利用在线路两侧实时同步采集的电压、电流数据结合此数值解推导出了一种有效的故障定位算法。数字仿真表明，有限差分算法能很好地反映线路的分布参数特性，即使在超长线路条件下，亦可获得高精度的定位结果。

An Accurate Fault Location Algorithm for Transmission Line Based on FDTD

Traditional fault analysis methods for transmission line mostly adopt lumped parameter model,so the distributed parameter characteristic of real transmission line can't be reflected at all.When the line is long,the results obtained by these methods can't meet the accuracy demand of practical applications any more.Distributed parameter model is used in this paper,and numerical solution is directly obtained from the wave equation of transmission line using finite difference method.Combining this numerical solution with the real time data of voltage and electric current synchronously sampled at both ends of the line,an effective fault location algorithm is presented.Digital simulation shows that the algorithm can well reflect the distributed parameter characteristic of transmission line,and it can achieve high-accuracy fault location results even when the line is extremely long.