基于可变行波辨识时窗的单端故障定位方法

Single-ended fault location method based on variable time windows for traveling wave identification

提出了一种基于改进分布参数法的可变时窗单端行波故障定位方法。该算法通过对端系统阻抗的在线估计,构建改进的分布参数法,改善常规方法误差分布的不规律性,提升依据工频量定位误差构建组合定位算法的可行性。探索改进分布参数法的定位误差分布,根据故障条件和误差规律计算可变的故障距离窗口,由此划定行波反射波辨识的可变时窗。基于该时窗,综合考虑测量本端和对端的母线接线方式、相邻母线反射波的影响等因素,构建可变时窗内的故障行波反射波辨识方法及定位方法。仿真验证结果表明,该方法提高了组合定位方法的可靠水平,故障定位精度较高,具有一定工程应用价值。

A single-ended fault location algorithm is proposed, based on the improved distributed-parameter method and variable time windows of traveling wave. According to the online estimation of the opposite terminal source impedance, the improved distributed-parameter method can be built, to enhance the location-error distribution regularity and improve the feasibility of the assembled fault location algorithm. Then based on the study of the location-error distribution of the proposed improved distributed-parameter method, the variable fault distance window can be computed, determining the variable time windows of the reflected waves to be identified. At last, considering the wiring schemes of local and opposite buses combined with the impact of the interference waves from adjacent buses, reflected waves contained in the variable time windows can be identified and the exact fault location can be detected. Simulation results demonstrate the high reliability and accuracy as well as the engineering application value of the proposed algorithm.