小波变换与傅里叶变换相结合的暂态谐波分析方法  

Transient harmonic analysis algorithm using wavelet transform and Fourier transform

作　　者：薛蕙[1] 罗红[1] 

机构地区：[1]中国农业大学信息与电气工程学院,北京100083

出　　处：《中国农业大学学报》2007年第6期89-92,共4页Journal of China Agricultural University

基　　金：国家"十一五"科技支撑项目(2006BAJ04B06);中国农业大学科研启动基金项目(2006023)

摘　　要：结合小波变换良好的时频局部化特性和傅里叶变换良好的频域分析特性,提出小波变换与傅里叶变换相结合的暂态谐波分析方法。利用傅里叶变换和静态小波变换得到被测信号频域特性和时域特性,再结合连续小波变换得到暂态谐波的时频特性。理论分析和仿真试验结果表明,利用本方法得到的暂态谐波幅值与理论值一致。本方法能够准确分析电网中的暂态谐波,可为电力系统暂态谐波的分析和治理提供依据。This paper presents a novel algorithm to analyze transient harmonics. The algorithm combines the merits of wavelet transform and FFT transform. The frequency character of the sampled signal was obtained using FFT transform and the time domain character of the sampled signal was obtained using Stationary Wavelet Transform. Then the time- frequency character of transient harmonics was obtained using continuous wavelet transform. Theoretical analysis and simulation results validated that the algorithm presented in the paper could be used for precise transient harmonic analysis in power system.

关 键 词：暂态谐波 傅里叶变换 静态小波变换 连续小波变换 

分 类 号：TM711[电气工程—电力系统及自动化]