基于柔性互联装备主动控制的配电网故障定位方法

Fault location method for distribution network based on active control of flexible interconnected equipment

Sen变压器可实现配电网的柔性互联,但其接入后故障电流的双向流动导致原配电网故障定位方案不再适用。针对该问题,提出一种基于Sen变压器主动控制的柔性互联配电网相间短路故障定位方法。该方法通过Sen变压器的主动调相控制调节其等效变比,利用波形相似度提取Sen变压器调相控制前、后电流波形的相位差异,并构造自相关系数比值判据,从而实现配电网故障区段的准确定位。所提方法无需电压信息,兼容分布式馈线自动化系统,对通信要求低且无需数据同步,提高了配电网故障区段定位的准确性。基于PSCAD/EMTDC仿真平台验证了所提方法的正确性和可行性。

The Sen transformer can achieve flexible interconnection of the distribution network,but the bidirectional flow of fault current after its connection makes the original fault location scheme of the distribution network no longer applicable.In response to this issue,a method for locating inter phase short circuit fault in flexible interconnected distribution network based on active control of Sen transformer is proposed.This method adjusts the equivalent transformation ratio of the Sen transformer through active phase modulation control,extracts the phase difference of the current waveform before and after the Sen transformer phase modulation control using waveform similarity,and constructs an autocorrelation coefficient ratio criterion,which can accurately locate the fault section of the distribution network.The proposed method does not require voltage information,is compatible with distributed feeder automation system,has low communication requirements and does not require data synchronization,improves the accuracy of fault section localization in distribution network.The correctness and feasibility of the proposed method are verified based on the PSCAD/EMTDC simulation platform.