基于FFT和小波包变换的电力系统谐波检测方法  

Detection of harmonic in power system based on FFT and wavelet packet

作　　者：房国志[1] 杨超[2] 赵洪[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 [2]国电南京自动化股份有限公司,江苏南京210003

出　　处：《电力系统保护与控制》2012年第5期75-79,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)(2007AA042105)~~

摘　　要：针对目前在进行谐波检测时存在频谱泄漏、柵栏现象以及由分析时运算量较大造成的识别定位速度慢、实时性不高等问题,提出了一种基于FFT和小波包变换的综合谐波检测方法。该方法利用傅里叶变换优秀的幅频特性,识别出所有的谐波分量,再利用小波包优秀的时频特性,快速、有选择地对所关注暂态谐波分量发生和结束时刻进行准确定位,同时将该谐波分量提取出来,这样有效地减少了运算量,提高了谐波检测的实时性。用Matlab仿真了综合谐波检测方法,并将仿真结果与目前常用的检测方法的仿真结果进行了比较,验证了所提方法对谐波检测的有效性和实时性。In view of the fences phenomenon, spectrum leakage and issues of slow identification and location and weak real-time performance caused by complicated computation that exist in the harmonic detection, a comprehensive harmonic detection method is presented based on FFT and wavelet packet transform. This method uses the excellent amplitude frequency characteristics of FFT to identify the harmonic component, uses the excellent time-frequency characteristics of wavelet packet to locate the time of harmonic occurrence and end quickly and selectively, at the same time extracts the contained harmonic component, so that it can reduce the computation and improve the real-time performance of the harmonic detection. Using Matlab to simulate the comprehensive harmonic detection method, it shows that the comprehensive harmonic detection method is more effective than the common detection methods.

关 键 词：电力系统 电能质量 谐波 傅里叶变换 小波包变换 

分 类 号：TM935[电气工程—电力电子与电力传动]