fft谐波分析_matlab进行fft谐波分析_交流电谐波?

--------------------------Page 1------------------------------中国电机工程学报990315中国电机工程学报PROCEEDINGS OFTHE CHINESESOCIETY FORELECTRICALENGINEERING1999年 第3期 No.31999电力系统谐波分析的高精度FFT算法张伏生耿中行葛耀中摘要快速傅立叶变换存在较大的误差，无法直接用于电力系统谐波分析。本文对FFT的泄漏误差进行了分析，根据Jain和Grandke提出的插值算法提出了多项余弦窗插值的新算法，对FFT的结果进行修正，极大地提高了计算精度，使之适用于电力系统的准确谐波分析。文中给出了该算法进行谐波分析模拟计算的算例，计算结果表明，不同的加窗算法计算精度不同，新算法的计算精度显著提高。关键词傅立叶变换电力系统谐波中图分类号TM714FFT ALGORITHM WITH HIGH ACCURACYFOR HARMONIC ANALYSIS IN POWER SYSTEMZhang FushengXian Jiaotong University Xian,710049 ChinaGeng ZhongxingResearch Center for Aviation Engineering and Technology,Beijing 100076 ChinaGe YaozhongXian Jiaotong University Xian,710049 ChinaABSTRACTThe FFT has a higher error in the harmonic ysis of the electricpower system, especially for the phases. This paper discussed the leakage of FFT andpresented a new amending algorithm, poly-cosin window interpolation, which based on theinterpolating algorithm proposed by K. Jain and T. Grandke. This new algorithm obviouslyimproves the accuracy of the FFT, so it can be applied to the precision ysis for electricalharmonic. The simulating result shows that applying deferent windows has the deferenteffects to the accuracy, and the Blackman-Harris window has the highest accuracy.KEY WORDSFourier transformElectric power systemHarmonic万方数据file:///E|/qk/zgdjgcxb/zgdj99/zgdj9903/990315.htm（第 1／10 页）2010-3-23 14:50:20--------------------------Page 2------------------------------中国电机工程学报9903151引言近年来，随着电力电子技术的广泛应用，电力系统谐波污染日益严重，已成为影响电能质量的公害，对电力系统的安全、经济运行造成极大的影响。

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