基于匹配追踪的配电网单相接地故障定位方法

Location method for single-phase grounding fault of distribution network based on matching pursuit

为了进一步解决采用小电流接地系统的配电网单相接地故障定位问题,利用原子稀疏分解匹配追踪算法分解单相接地电流暂态信号,自适应地提取衰减的直流电流分量.结合配电网拓扑结构和提取的衰减直流分量幅值,划分故障路径并进一步定位故障点.仿真结果表明,匹配追踪算法可以快速有效地提取衰减直流分量,准确地实现小电流接地系统单相接地故障的在线区段定位.相比于传统算法,原子稀疏分解理论克服了传统非自适应性算法的局限性,提高了暂态信号成分提取的准确性.

In order to further solve the problem of single-phase grounding fault location of distribution network of small current grounding system,the transient signals of single-phase grounding current were decomposed with an atomic sparse decomposition matching pursuit algorithm,and the attenuated DC current component could be adaptively extracted. Combined with the topological structure of distribution network and the extracted attenuated DC component amplitude,the fault path can be divided,and the faults will be further located. The simulation results showthat the matching pursuit algorithm can quickly and effectively extract the attenuated DC component,and accurately achieve the on line section location of single-phase grounding fault of small current grounding system. Compared with the traditional algorithms,the atomic sparse decomposition theory can overcome the limitation of traditional non-adaptive algorithms, and improves the extraction accuracy of transient signal component.