扩展PRONY算法在输电线路故障定位中的应用

An extended prony algorithm in power transmission lines fault localization

电力系统输电线路发生短路故障后,继电保护装置会迅速动作,这时故障定位系统仅采集到故障后短暂的波形数据.通常情况下,系统采集到的故障波形含有暂态分量,这会影响到基于相量故障定位算法的精度.针对此种情况,本文提出使用扩展Prony算法从故障后暂态数据中提取出基波电压和电流分量,然后使用双端非同步测量定位算法进行故障定位,获得了较为精确的结果.通过PSCAD和MATLAB进行仿真,并将结果与采用在电力系统中应用广泛的全波傅氏算法提取故障后基波分量得到的定位结果进行比较,仿真结果表明本文所提算法能让定位误差减小至0.5%以下.

The relay protection devices response quickly while faults occur in power transmission lines.During the procedure,only transitory data are collected by fault location systems.The transient components are included in collected data and cause inaccuracy in fault localization.The paper gives a novel Prony-based algorithm that calculates phasors of fault voltages and fault currents and locates the fault by utilizing two-end unsynchronized measurements.And the accurate results are acquired.Simulation results based on PSCAD and MATLAB are presented and show more better location precision by comparing with results of full wave Fourier algorithm.Prony-based algorithm makes the error of location results less than 0.5%.