基于粗集理论的小电流接地系统故障选线研究

针对小电流接地系统中单相接地故障选线困难的问题，提出了一种基于粗集理论的故障选线新方法.在分析小电流接地系统线路零序电流故障特征的基础上，将基于粗集理论的信息融合技术引入故障选线系统.将利用小波分析方法、零序有功分量方法和五次谐波方法提取的故障特征作为条件属性，线路的故障状态作为决策属性.通过对信息系统的约简，得到最小决策规则，该规则即可实现故障选线.仿真结果表明，该方法正确、有效.

Study on Fault Line Detection Based on Rough Set Theory in Indirectly Grounding Power System

Because the fault line detection of single-phase-to-earth fault in indirectly grounding power system was very difficult, a new method of fault line detection based on rough set theory was presented. The information fusion technology based on rough set theory was introduced in the fault line detection system by analyzing fault characteristics of the zero sequence current of lines in compensated distribution networks. Fault characteristics extracted by using wavelet transform method, zero sequence current active component method and the fifth harmonic current method were looked as condition attributes. The fault states of lines were used as decision attributes. After the constructed information system was reduced, the minimum solution of decision rules can be obtained to realize fault line detection. The simulation results proved its efficiency and feasibility.