基于同步挤压小波变换的配电网单相高阻接地故障选线

为提高配电网单相接地故障选线的成功率,提出了一种基于同步挤压小波变换的配电网单相高阻接地故障选线新方法。该算法首先通过同步挤压小波变换方法确定各馈线的最大时频脊线,计算最大时频脊线下的挤压能量和挤压相角。在此基础上,通过闵可夫斯基距离来表征每条线路的故障特征,并以此特征区别接地与非接地馈线。仿真实验结果显示,该选线算法受故障位置,过渡电阻,初始角度,馈线结构等因素的影响较小,能够准确地识别故障线路。对比其他已知算法,该算法对电流信号的处理精度更高,能更好适应复杂的配电网系统。

High-Impedance Grounding Fault selection inthe Distribution Network Using Synchrosqueezed Wavelet Transforms

In order to improve the success rate of the High-Impedance Grounding Fault (HIGF) selection, a new algorithm is proposed to work in HIGF Selection. By using Synchrosqueezed Wavelet Transforms (SWT), the maximum time-frequency ridge of each feeders was analyzed first. Then the synchrosqueezed energy and the synchrosqueezed angle of each feeders are calculated to characterize the feature of each feeder by utilizing Minkowski distance. The fault and non fault line can be distinguished based on the feature. According to the simulation result, this algorithm is little influenced by the fault location, ground resistance, initial phase angle, feeder structure, etc. The fault line can be selected accurately. Comparing with other available algorithms,this new algorithm has higher accuracy and better adaptation in complex distribution network.