采用模糊理论的接地网故障诊断方法  

Method of Grounding Grid Fault Diagnosis Based on Fuzzy Theory

作　　者：张蓬鹤[1] 何俊佳[1] 尹小根[1] 

机构地区：[1]华中科技大学电气与电子工程学院,武汉430074

出　　处：《高压电器》2011年第5期54-58,共5页High Voltage Apparatus

摘　　要：为解决接地网故障准确定位的问题,笔者提出了采用模糊函数的接地网故障诊断方法。根据接地网故障诊断这一具体问题,改进了模糊理论中的两个重要原则——贴近度和择近原则。利用复镜像法和Prony法,采用MATLAB进行编程,计算出10×10完整状态接地网和故障状态接地网的地表电位分布,作为诊断算法样本数据库。采用VC++编程,用改进的贴近度公式计算完整状态接地网样本与故障状态接地网样本之间的关系,初步诊断出故障样本库。最后,计算故障样本内各点之间的差异值,利用择远原则最终诊断出接地网的故障位置。运算结果表明模糊理论算法准确率高。In order to settle the problem of the exact fault placement on grounding grid,a new fault diagnosis method was brought forward based on the fuzzy theory.The two important principles of fuzzy theory,degree of nearness and furthest selection,were improved according to this specific problem of grounding grid fault diagnosis.Making use of the complex image method and Prony method,adopting the MATLAB program,the distribution of earth surface potential of the 10×10 intact and fault grounding grid were calculated,as the sample data-base.Adopting VC＋＋ program,calculating the relation between the intact grounding grid sample and the fault grounding grid sample based on the improved fuzzy degree of nearness,the fault sample data-base were diagnosed.Subsequently,calculating the difference between the fault samples,the fault placement of grounding grid was diagnosed based on the principle of furthest selection.The result indicated that the accuracy is high.

关 键 词：模糊贴近度 接地网 故障诊断 电位 

分 类 号：TM862[电气工程—高电压与绝缘技术]