基于小波相关分析的小接地系统故障选线方法  

Fault Line Selection Method for Small Grounding Systems Based on Correlation-wavelet Analysis

作　　者：薛太林 张建新 侯隽朗 Xue Tailin;Zhang Jianxin;Hou Junlang(Department of Electrical Engineering,Shanxi University,Taiyuan Shanxi 030013,China)

机构地区：[1]山西大学电力工程系,山西太原030013

出　　处：《电气自动化》2018年第4期77-80,共4页Electrical Automation

摘　　要：在小电流接地系统中,单相接地故障选线问题仍未解决。利用小波包与相关分析法相结合来进行故障选线。首先,分析了故障暂态零序电流的特征、小波相关分析理论;其次,根据选线原理得出选线判据:搭建单相接地故障模型,对采样电流进行小波包多尺度分解,然后求出线路之间的相关系数M以及线路综合相关系数ρ,ρmin所在支路为故障线路;最后,通过PSCAD、MATLAB仿真验证了方法的有效性。In the small current grounding system,the problem of single-phase grounding fault line selection has not been solved yet. Wavelet packet and correlation analysis method were used in combination to complete fault line selection. Firstly,characteristics of fault zero sequence transient current were analyzed. Secondly,criterion of line selection was obtained according to the line selection theory,the single-phase grounding fault model was set up,and wavelet packet multi-scale decomposition was completed for the sampling current. Then,correlation coefficient M between lines as well as comprehensive correlation coefficient ρ were obtained. The branch where ρminwas located was the fault line. Finally,the effectiveness of the proposed approach was verified through PSCAD and MATLAB simulation.

关 键 词：单相接地 零序电流 小波包 相关分析 故障选线 

分 类 号：TM64[电气工程—电力系统及自动化]