基于小波分析的配电网故障选线方法研究

提出了一种基于小波分析的配电网故障选线方法。通过剔除线路谐振状态的频带,利用小波包良好的分频特性,以适当带宽对故障后线路的暂态零序电流进行分解,从而实现在低频段下对各线路的零序电流进行小波重构,通过比较重构后的信号来实现选线。仿真实验表明,该选线方法受故障点位置、故障时刻、过渡电阻等因素影响较小,具有可靠性高、抗干扰能力强的特点,适用于中性点不接地的配电网。

Study on the Method of Detecting Single-phase-to-ground Fault Line for Distribution Network

A wavelet analysis-based distribution network fault line selection method is proposed.Excluding the state through the resonant circuit of the band,using wavelet packet sub-frequency characteristics of sound to the appropriate bandwidth of the transient fault lines after the current zero-sequence decomposition,will result in a lower band on the line for zero sequence current wavelet reconstruction,by comparing the reconstructed signal to achieve alignment.Simulation results show that the method selected by the fault location,fault time,factors such as the transition is less resistance,high reliability,strong anti-interference ability of the characteristics of the application of neutral grounding in the distribution network.