基于PMU动态同步相量测量的故障测距

Research on Fault Location Based on Dynamic Synchronous Phasor Measurement by PMU

为提高故障测距的准确性,提出了一种基于相量测量单元(phasor measurement unit,PMU)动态同步相量测量的输电线路双端故障测距算法。通过分析单端故障测距算法因线路对端数据未知而导致的故障测距误差,引入同步相量测量单元,并应用动态同步相量测量算法,有效提高动态同步相量测量的精确性和实时性;以全球定位系统(global position system,GPS)为时间基准,将故障时刻线路双端相量测量结果,应用于正序网络的测距方程,进行准确地故障定位。仿真实验表明,所提算法充分利用线路两端的故障信息,提高了故障测距的准确性。

To improve the accuracy of fault location, a two-terminal fault location algorithm based on dynamic synchronous phasor measurement by phasor measurement unit（PMU） is proposed. As for single-terminal fault location algorithm the fault location error caused by unknown data at opposite terminal is analyzed; then by means of leading in synchronous PMU and applying dynamic synchronous phasor measurement algorithm, both accuracy and real-time performance of dynamic synchronous phasor measurement can be effectively improved. Using global position system（GPS） as time reference, the phasor data measured at both terminals of the transmission line at the moment when the fault occurred is applied to fault location equation of positive sequence network to locate the fault accurately. Simulation results show that the proposed algorithm can fully utilize the fault information at both terminals of the transmission line, thus the accuracy of fault location is improved.