五项MSD-Rife窗的四谱线插值FFT电力谐波分析  

Electrical Harmonic Analysis Based on Five-Term MSD-Rife Window and Four-spectrum-line Interpolation FFT

作　　者：南雪 杨淑连[1] 李田泽[1] 乔家振 NAN Xue;YANG Shu-lian;LI Tian-ze;QIAO Jia-zhen(College of Electrical and Electronic Engineering,Shandong University of TechnoIogy,Zibo 255049,China)

机构地区：[1]山东理工大学电气与电子工程学院,山东淄博255049

出　　处：《水电能源科学》2018年第10期177-180,共4页Water Resources and Power

基　　金：山东省教育厅项目(J15LN31)

摘　　要：在采用快速傅里叶变换(FFT)对电网谐波进行分析时,信号的非整周期截断和非同步采样而造成的频谱泄漏会影响检测结果的精度,加窗插值则能有效地解决问题。分析了五项MSD-Rife窗在不同权重时的频谱特性,提出了一种基于五项MSD-Rife窗的四谱线插值FFT谐波分析算法,即先对谐波信号加窗,然后利用真实谐波点附近的4根最大谱线值确定实际谱线的位置,运用曲线拟合函数推导出了简单实用的四谱线修正公式。仿真试验结果表明,该算法较其他算法在幅值、相位和频率上的检测精度更高,从而消除了频谱泄漏和栅栏效应带来的影响。When the Fast Fourier Transform（FFT）method is used to analyze the harmonics in a power network,the sampled signal＇s non-full-cycle truncation and non-synchronous can cause the spectrum leakage,which will affect the accuracy of the detection results,window functions and interpolation algorithm can effectively solve the problem.The spectral characteristics of five-term MSD-Rife window with different weights are analyzed.A electrical harmonic analysis based five-term MSD-Rife window and four-spectrum-line interpolation FFT is proposed.The algorithm firstly windows the harmonic signals,and then uses the four maximum spectral lines near the true location to determine the actual spectral line position,the applicable rectification formula of the four-spectrum-line interpolation is obtained by using polynomial curve fit functions.The simulation results show that the proposed algorithm can detect the amplitude,phase and frequency more accurately in asynchronous sampling,and eliminate the influence of spectrum leakage and fence effect.

关 键 词：谐波分析 快速傅里叶变换 五项MSD-Rife窗 四谱线插值 频谱泄漏 

分 类 号：TM935[电气工程—电力电子与电力传动]