基于相位特性的高压输电线路双端非同步故障测距算法

现有的大部分双端数据不同步测距算法由于伪根的存在可能导致测距失败。针对这一不足,基于线路分布参数模型,利用电压正序分量与负序分量的比值或者电压正序分量与故障正序分量的比值消除不同步角,并利用相位的单调性进而推出一种双端非同步故障测距算法。该算法不存在伪根,可以利用二分区间求根法或者弦截求根法快速求取故障距离。EMTP仿真结果表明,该算法测距精度不受过渡电阻、故障类型以及不同步角的影响,计算量小,测距精度高。

A Two-terminal Fault Location Algorithm Using Asynchronous Data Based on Phase Characteristics for High Voltage Transmission Line

The current algorithms of unsynchronized two-terminal fault location may lead to failure to locate the fault because of the false root. To overcome the defect, a new two-terminal fault location algorithm is proposed. Based on a distributed parameter model for the power transmission line, this paper uses the ratio of positive to negative sequence component of voltage or the ratio of voltage positive and fault positive sequence component to eliminate the asynchronous angle and then proposes a new algorithm of two-terminal fault location with asynchronous data based on the monotonicity of the phase. The algorithm without the false roots and the bisection method or secant method can be used to find out the fault position quickly. The EMTP simulation results show that this method is hardly affected by transition resistance, fault type and the asynchronous angle. The computation amount is small and the ranging precision high. This work is supported by Fundamental Research Funds for the Central Universities (No. 2014xs74).