基于加窗FFT和HWT算法的谐波检测系统设计  

Design of harmonic detection system based on FFT and HWT algorithms

作　　者：王娟[1] 张尔东[1] 于广艳[1] Wang Juan;Zhang Erdong;Yu Guangyan(School of Information Engineering,Harbin Institute of Petroleum,Harbin 150027,China)

机构地区：[1]哈尔滨石油学院信息工程学院,哈尔滨150027

出　　处：《电测与仪表》2021年第7期189-194,共6页Electrical Measurement & Instrumentation

基　　金：黑龙江省自然科学基金联合引导项目(LH2019F045)。

摘　　要：为了提高电网谐波的检测精度,特别是考虑电网中存在间谐波的情况,及造成的频谱泄漏和栅栏效应问题。采用了改进加窗插值FFT和HWT混合的非整次谐波算法,加窗插值采用可修改的Hanning窗、HWT采用谐波小波算法,更好地消除了间谐波的影响。硬件采用STM32+DSP的双CPU并行处理技术,提高了数据处理速度。MATLAB仿真结果以及实验结果分析表明,该算法提高了谐波检测精度,改善了系统的动态性能,并达到预期的效果,具有一定的实际意义。In order to improve the detection accuracy of power grid harmonics,especially when there are inter harmonics in the power grid,the spectrum leakage and fence effect caused by them are also discussed.This paper adopts the improved windowed interpolation FFT and HWT hybrid non-integer harmonic algorithm,windowed interpolation adopts modified Hanning window,and HWT adopts harmonic wavelet algorithm,which better eliminates the influence of inter-harmonics.The hardware adopts STM32+DSP dual CPU parallel processing technology to improve the data processing speed.MATLAB simulation results and experimental results show that the proposed algorithm improves the accuracy of harmonic detection,improves the dynamic performance of the system,and achieves the desired effect,which has certain practical significance.

关 键 词：加窗插值FFT算法 谐波小波法 非正次谐波 双CPU并行处理 

分 类 号：TM933[电气工程—电力电子与电力传动]