基于Prony算法的单相自适应重合闸故障识别方法

基于电压互感器"带通"特性及实际系统工频分量的特点,提出了一种适用于带并联电抗器的特高压输电线路单相自适应重合闸故障识别方法。首先,利用ATP-EMTP电磁暂态软件建立电弧模型;其次,使用Prony算法求取工频衰减因子,并计算固定时间窗内的衰减因子比;最后通过比较瞬时性故障和永久性故障衰减因子比的差异提出故障识别判据。通过大量仿真及计算表明,无论故障点位置在哪,该方法均能够正确、有效识别瞬时性故障和永久性故障。

Method of fault identification for single-phase adaptive reclosure based on Prony algorithm

A fault nature identification method for single-phase adaptive reclosure on UHAVC transmission lines with shunt reactors is proposed by considering bandpass characteristics of the voltage transformer and power frequency component in the power system. By using the ATP-EMTP software the arc model is built. Then, the attenuation factor is extracted by Prony algorithmand the attenuation factor ratio in fixed time window is calculated with Prony algorithm. Finally, the identification strategy which can distinguish the permanent fault and intermittent fault is put forward by comparing the difference of attenuation ratio factor. A lot of calculation results and simulation results show that wherever the fault location is, the transient fault and permanent fault can be correctly and effectively identified.