基于AGM曲线能量的配电网故障区段定位方法

Fault Line Section Location Method for Distribution Network Based on AGM Curve Energy

配电网发生单相接地故障后,准确识别故障区段对配电网的安全稳定运行具有重要意义。因此,根据单相接地故障后故障点异侧暂态零序电流波形趋势差异显著的特点,本文提出一种基于暂态零序电流自适应全局均线能量的故障区段定位方法。首先,利用极点对称模态分解得到反映故障后暂态零序电流波形趋势的自适应全局均线;然后,利用故障后暂态零序电流自适应全局均线的能量差,描述故障后暂态零序电流波形趋势的差异程度,构建判据确定故障区段。仿真结果表明,该方法在不同故障条件下均可准确识别故障区段。

Identifying the fault line section location with accuracy is of importance to the safe and stable operation of dis⁃tribution network under single-phase ground faults.According to the different trends of transient zero-sequence current waveform on the opposite side of the fault point after a single-phase ground fault occurs,a fault line section location method based on the transient zero-sequence current adaptive global mean curve energy is proposed.The extreme-point symmetric mode decomposition method is employed to obtain the AGM curve that reflects the trend of the transient zerosequence current waveform after the fault occurrence.The energy difference in the transient zero-sequence current AGM curve after fault is used to describe the degree of difference in the transient zero-sequence current waveform trend,thus formulating a criterion to determine the fault line section.Simulation results show that the proposed method is capable of accurately identifying the fault line section under different fault conditions.