一种基于PMU的线路自适应故障测距算法

提出一种新的基于相量测量单元(PMU)的输电线路故障测距的自适应算法。该算法利用PMU装置获得高压线路两端的电压和电流相量,在线计算线路参数,解决了线路实际参数与电力局所提供参数的不同、线路参数在运行过程中的不确定性等问题。采用前置带通滤波器与全波傅氏算法相结合的滤波算法,提取相当精确的突变量基频分量,用于输电线路故障测距。大量的EMTP仿真计算结果和实际系统参数验证结果表明,该测距算法不受系统的运行方式、故障点过渡电阻、故障类型、故障距离等因素的影响,具有很高的测距精度。

An adaptive fault location algorithm based on PMU for transmission line

A new adaptive fault location algorithm based on phasor measurement unit(PMU) for transmission line is presented in this paper. Voltage and current phasors of both ends of the transmission line are obtained through PMU. The online parameter estimation algorithm is adopted to solve the problems such as practical parameters being different from parameters provided by electric power company, and the uncertainty of line parameters in the process of operation. The DFT based filter combined with a band-pass filter help to extract extremely accurate fundamental frequency components for calculation of fault location. Extensive EMTP simulations as well as practical system data test results have shown that the proposed algorithm allows for accurate estimation in fault location, and is immune from the operation mode, transition resistance at fault point, fault types and fault distance.