基于时域有限差分法的输电线路精确故障定位算法  

An Accurate Fault Location Algorithm for Transmission Line Based on FDTD

作　　者：石新生 刘宏新[2] 肖文峰[2] 龚庆武[2] 陈玉林[2] 

机构地区：[1]江西省赣东北供电公司,江西乐平333300 [2]武汉大学电气工程学院,武汉430072

出　　处：《中国农村水利水电》2005年第12期81-84,共4页China Rural Water and Hydropower

摘　　要：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。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。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 extremelv lone.

关 键 词：故障定位 时域有限差分法 分布参数 双端算法 

分 类 号：TM762.25[电气工程—电力系统及自动化]