几种工频双端测距算法对测量误差的适应性研究

Research on adaptability to measurement error for several two-terminal fault location algorithms

在准确获得输电线路参数和线路两端电气量的条件下,常用的工频双端测距算法均能够给出精确的定位结果。但实际应用中,电压互感器和电流互感器不可避免地存在测量误差,从而可能导致定位算法的精度降低甚至故障定位失败。在介绍和比较四种常用的双端测距算法原理的基础上,引入电流、电压互感器的测量误差并结合工程实际对该测量误差进行化简,在提出的几种典型的测量误差模式下,仿真比较了测量误差对各种双端测距算法测量精度的影响。仿真结果表明基于参数修正的Π型线路模型的序电压比算法对各种测量误差模式的适应性更好。

On the condition of getting the parameters of transmission line and electrical quantities of two terminal of transmission line,the common two-terminal fault location algorithms can give an accurate fault location.But in the real application,the values of voltages and currents which are transferred by voltage transformers and current transformers have errors inevitably.Because of this,the accuracy of fault location algorithms may decrease or even a failed fault location turns out.In this paper,by introducing and comparing the principles of four common two-terminal fault location algorithms,the measurement errors of voltage transformers and current transformers are introduced and simplified based on practical engineering.Under the several typical models of measurement errors proposed,the adaptability to measurement errors for all kinds of two-terminal fault location algorithms is compared by simulation.Results of simulation prove that the sequence voltage ratio algorithm of Π line model based on data correction has the best adaptability.