基于模糊理论的小电流接地故障选线融合技术研究

Fault Line Detection Mixed for Non-solidly Grounded System Based on Fuzzy Sets Theory

正确的接地故障选线是小电流接地系统存在的一大难题,通常采用的单一故障选线方法只对部分故障信息进行处理,因此选线的可靠性不高。基于这种状况,利用信息融合技术,并以基于信号增强的小波包故障选线法、群体基波比幅比相法、有功法的3种接地故障选线方法为例进行了模糊综合评判实例仿真,仿真结果说明针对多种选线方法进行模糊信息融合能够充分发挥各自优势,相互补充,扩大正确选线的范围。

Correct fault line detection is a difficult problem in the operation of non-solidly grounded system. So this paper introduces the information fusion technology to make full use of all the steady-state and transient-state information of sing-phase-to-earth fault current, and proposes a multi-criterion fusion faulty line detection method. The actual example simulations of fuzzy comprehensive evaluation for three methods are more progressive in enhancing the accuracy of faulty line detection.