基于模糊理论的煤矿供电系统接地故障选线方法

针对单一接地故障选线方法经常出现选择性失效的问题,提出了一种将零序全电流功率方向原理、小波变换分析原理、灰色关联分析原理相结合的接地故障选线方法。该方法利用零序电压多重分形谱确定方法权重,使用模糊推理理论进行多判据信息融合。Matlab仿真实验结果表明,通过定位方法确定权重的复合判据适用于各种情况下的单相接地故障选线,不受系统中性点接地方式、运行方式、出线路数及接地位置的影响,实现了高准确率的单相接地故障定位。

Grounding fault line selection method of power system of coal mine based on fuzzy theory

For problem that fail selection often happened in single grounding fault line selection method,a new method combining zero sequence current power direction principle,wavelet transform analysis principle and gray relational analysis principle was proposed.The method uses the zero-sequence voltage multifractal spectrum to determine weights of the methods,and uses fuzzy inference theory for multi-criteria information fusion.Matlab simulation results show that the compound criterion which determines the weight through positioning method is suitable for single-phase grounding fault line selection in a variety of circumstances,and is not affected by system neutral grounding mode,run mode,out line number and grounding position,which achieves high accuracy single-phase grounding fault location.