一种双端同步采样的时域故障测距算法

A time-domain fault location algorithm using synchronized sampling at two ends

输电线路快速准确的故障定位是保证电力系统安全稳定运行的有效途径之一,对电力系统有重要意义。传统的单端故障测距算法易受过渡电阻及对侧助增电流影响,而双端故障测距算法一般基于频域的相量计算。提出一种基于模式理论和双端同步采样的时域故障测距算法。该算法所需传送数据量少,并且不受过渡电阻、运行方式、故障类型等因素的影响,并且可以将其推广到同杆并架双回线。EMTP仿真结果显示该算法有较高精度,测距快速简便。

Fast and accurate fault location for transmission lines plays an important role in safe and steady run of power system .The conventional single-terminal method of fault location can not eliminate the influence of the fault resistance and remote in-feed, two-terminal methods commonly based on phase calculation in frequency-domain. This paper presents a time-domain fault location algorithm based on modal theory and synchronized sampling at two ends. The algorithm needs less data from another end and is not influenced by the following factors, such as fault resistance, operation state, fault type, etc. The algorithm can also be used in fault location for double-circuit line. Lots of simulation results using EMTP have proved the high accuracy of the method.