基于Meyer小波和FFT的电网间谐波检测  

Detection of inter-harmonic in power system based on Meyer wavelet and FFT

作　　者：房国志[1] 杨才山[1] 杨超[1] 

机构地区：[1]哈尔滨理工大学测控技术与仪器黑龙江省高校重点实验室,黑龙江哈尔滨150080

出　　处：《电力系统保护与控制》2011年第12期90-93,101,共5页Power System Protection and Control

基　　金：国家高新技术研究发展计划(863计划)资助(2007AA042105)~~

摘　　要：针对快速傅里叶法对间谐波的检测存在频谱泄露和栅栏现象,提出了利用FFT和小波变换综合的间谐波检测法。该方法由FFT算法得到各频谱的频率,根据得到的频率确定多分辨率的分解层数和频段范围。最后运用无限可导、双正交性和无频谱混叠现象的Meyer小波对小小小小分解和重小,得到无频谱泄露和小栏现象的各间谐波分小。该分小法得到的小小小小和目前常用的db3小波小小小小相比更具有效性,可以准确地提取基频分小和各次间谐波分小,并实时跟踪间谐波的变化,达到了检测间谐波的目的。As the detection of inter-harmonic based on the traditional fast Fourier transform algorithm exists spectrum leakage and fence phenomenon,an inter-harmonics detection method is presented,which comprehensively applies FFT and wavelet analysis.The frequency of the spectrum is obtained by the FFT firstly,and then the multi-resolution decomposition level and frequency range are determined by using the special frequency.Finally,Meyer wavelet with infinite differentiability,biorthogonal and non-overlapping frequency bands is applied to do the signal＇s decomposition and reconstruction,thus to obtain the interharmonic component of non-spectrum leakage and the fence phenomenon.It shows that the complex inter-harmonic detection algorithm can extract the fundamental frequency component and inter-harmonic component accurately and real-time track the changes of the inter-harmonic.It is more effective than the common db3 wavelet.

关 键 词：电能质量 间谐波 FFT Meyer小波 频谱泄露 栅栏 

分 类 号：TM935.2[电气工程—电力电子与电力传动]