Db8小波在电力系统谐波分析中的应用  

On the application of analyzing power system harmonics using Db8

作　　者：朱翔[1] 解大[1] 高强[1] 张延迟[2] 

机构地区：[1]上海交通大学电气工程系,上海200240 [2]上海电机学院电气工程系,上海200240

出　　处：《电力科学与技术学报》2011年第2期67-71,共5页Journal of Electric Power Science And Technology

基　　金：国家自然科学基金(60772006)

摘　　要：为满足电力系统非稳态谐波有效分析的要求,选取具备较好的正交性、紧支撑性和可离散性等特性的Db8小波进行电力系统谐波分析,介绍Db8小波谐波分析的方法和算法.MATLAB仿真分析表明,Db8小波能快速、有效地提取包括平稳和非平稳电网信号在内的各种谐波波形,并能准确地检测到突变信号发生的时刻及起始位置.FFT can not analyze power system non-steady-state harmonics effectively,and wavelet function need to possess the characteristics of orthogonality,compactly support and discreteness when analyses the harmonics.Based on the computational efficiency and analysed effects,Db8 waveform is selected to analyze power system harmonics.Simulation based on MATLAB indicates that Db8 can extract steady-state harmonics and non-steady-state ones swiftly and effectively,and can detect mutation times and mutation places accurately.

关 键 词：Db8小波 谐波分析 波形提取 突变点检测 

分 类 号：TM711[电气工程—电力系统及自动化]