动态条件下的T形输电线路故障测距算法

当电力系统在功率低频振荡等动态情况下发生故障时,电力信号幅值和频率往往表现出一定的动态特性,影响了传统的T形输电线路故障测距算法的精度.因此,提出了动态条件下T形输电线路故障测距算法.该方法拓展了传统的静态信号模型,建立了时变的信号模型使其能正确表示信号的动态特性,并加入基于同步相量测量单元(PMU)的动态同步相量测量...

A Fault Locating Algorithm for Three-terminal Transmission Lines Under Dynamic Conditions

Magnitude and frequency of power signals always present certain dynamic characteristics,while fault happens during power system is in active power low frequency oscillation.Both above factors reduce the accuracy of traditional fault locating algorithm for three-terminal transmission lines.Thus,a new fault locating algorithm for three-terminal transmission lines under dynamic conditions is proposed.The new algorithm extends traditional static signal model and builds a time-variable signal model in order to properly show dynamic characteristics of the signal.After using the adjoining signal phasor estimated from synchronous phasor measurement units(PMUs),this algorithm can be used to correctly identify the fault branch and estimate the line parameters under dynamic conditions.And finally an accurate estimate of fault location can be attained via a Newton iteration method.The performance of the proposed algorithm is evaluated by simulation of various operation situation with PSCAD/EMTDC software.Simulation results show that the proposed technique yields a more accurate fault locating algorithm than traditional static state algorithm and is independent of fault locations,fault impedance,and fault types.