基于改进FFT的电力系统谐波频谱分析  

Harmonic Spectrum Analysis of Power System Based on Improved FFT

作　　者：余茂全[1] 张磊[1] 赵涟漪[1] YU Maoquan;ZHANG Lei;ZHAO Lianyi(Anhui Water Conservancy Technical College,Hefei 230001,China)

机构地区：[1]安徽水利水电职业技术学院,安徽合肥231603

出　　处：《安徽电气工程职业技术学院学报》2023年第2期43-47,共5页Journal of Anhui Electrical Engineering Professional Technique College

基　　金：安徽省高校自然科学研究项目“新型电力系统背景下智能安全带的设计”(项目编号:2022AH052284);安徽省职业与成人教育学会教育教学研究规划重点课题“电气自动化专业虚实结合实训平台建设及教学研究”(项目编号:Azcj2022029);安徽省高校优秀青年骨干人才国内外访学研修重点项目(项目编号:gxgnfx2021207)。

摘　　要：快速傅里叶变换(Fast Fourier Transform, FFT)是电力谐波检测分析中运用最广泛的方法之一,但受到频谱泄露的影响,测量精度有待进一步提高。针对以上问题,在使用FFT对电力谐波进行分析时,从改变采样时长、加窗函数和相位差法三方面进行算法改进,并进行仿真研究。研究结果表明,采样时间为信号周期的整数倍可以有效减小因频谱泄露而引起的测量误差,使用不同窗函数在抑制谐波频谱泄漏方面的性能各有不同,相位差法可以校正幅值和频率。改进FFT算法有利于提高电力谐波分析的精度,得到精度更高的信号频谱。Fast Fourier Transform(FFT)is one of the most widely used methods in power harmonic detection and analysis.However,due to the influence of spectrum leakage,the measurement accuracy needs to be further improved.In view of the above problems,when using FFT to analyze power harmonics,the algorithm is improved from three aspects:changing the sampling time,windowing function and phase difference method,and simulation research is carried out.The results show that the sampling time is an integral multiple of the signal period,which can effectively reduce the measurement error caused by spectrum leakage.The performance of different window functions in suppressing harmonic spectrum leakage is different,and the phase difference method can correct the amplitude and frequency.The improved FFT algorithm is beneficial to improve the accuracy of power harmonic analysis and obtain more accurate signal spectrum.

关 键 词：FFT 谐波分析 频谱分析 窗函数 频谱校正 

分 类 号：TM711[电气工程—电力系统及自动化]