多小波理论在配电网接地故障选线中的研究应用

Research and application of multiwaves theory for the fault selection the phase-to-ground fault selection in distribution network

针对小电流接地系统单相接地故障选线准确度较低的问题,文中提出了一种基于多小波分析的配电网故障选线方法。在对多小波函数的选取、多小波选线判据以及多小波选线流程的论述之后,采用Matlab建立了3条支路的供电系统仿真模型,对正常运行及在某线路发生接地故障时的零序电流和零序电压的大小和方向进行了仿真研究,仿真结果表明,该方法不受故障点位置、故障时刻、过渡电阻等因素的影响,具有故障选线的快速性和准确性,在配电网故障选线方面具有很好的应用前景。

According to small current grounding system single-phase ground fault line lower accuracy problems, This paper proposes a power distribution network fault line selection method based on multiwavelets analysis.In the following of discussions about the selection of multiwavelets function, multiwavelets line selection criterion and multiwavelets line selection process, using Matlab,three branches of power system simulation model were established,the research was carried out on simulation of the size and direction of zero sequence current and zero sequence voltage,in the normal operation of the circuit and ground fault occurred at a certain line. The simulation results show that this method is not affected by fault location, fault time, transition resistance and so on, and achieves features of the fault line of rapidity and accuracy.So,Multiwavelet theory has the very good application prospect in the aspect of power distribution network fault line selection.