采用改进自适应Prony方法的电力故障信号的分析与处理  

Analysis and Processing of Electrical Fault Signals With Modified Adaptive Prony Method

作　　者：孙晓明[1] 高孟平[2] 刘涤尘[3] 侯兴哲 袁荣湘[3] 

机构地区：[1]云南电网公司博士后科研工作站,云南省昆明市650217 [2]云南电力调度中心,云南省昆明市650011 [3]武汉大学电气工程学院,湖北省武汉市430072 [4]重庆电力科学试验研究院,重庆市渝中区401123

出　　处：《中国电机工程学报》2010年第28期80-87,共8页Proceedings of the CSEE

基　　金：国家自然科学基金项目(50677046)~~

摘　　要：Prony方法(Prony method,PM)不适于处理含非持续性或突变性分量的故障信号。自适应PM(adaptive PM,APM)通过对信号自适应分段改善了PM的性能,但在搜索子段分界点时采用固定步长,效率低、运行时间长。提出改进APM(modified APM,MAPM),通过引入变步长策略大大提高了搜索效率。仿真结果表明,MAPM具有很高的信号拟合及参数估计精度,基于其的信号插值、延拓具有传统方法所没有的自适应性。MAPM对故障信号分析处理的实例再次表明了它的优越性能,为它在电气工程中的推广应用奠定了基础。Prony method （PM） is unsuitable for processing the fault signals containing components with uncontinuous or abrupt changes. The adaptive PM （APM）, by adaptively seg- menting a signal, improves PM＇s performance, but it takes fixed step to search the subsegments＇ dividing points, so efficiency is low and execution time is long. This paper proposes a modified APM （MAPM） that introduces variable-step measure and greatly promotes the searching efficiency. Simulation results show that MAPM＇s signal fitting and parameters estimation are of high accuracy, and the signal interpolation and prolongation based on it are adaptive while the traditional methods are not. A real-life fault signal is analyzed and processed by MAPM, again showing its superior performance and establishing its basis for extensive use in electrical engineering.

关 键 词：电力系统 改进白适应Prony方法 电力故障信号 分段拟合 插值 延拓 

分 类 号：TM77[电气工程—电力系统及自动化]