2013•Shaanxi Electric PowerRequires access

An Accurate Method for Interpolated FFT Harmonic Analysis Based on a New Window

Liu Cui-lin

Abstract

The harmonic measurement accuracy would be effected by frequency leakage resulted from unsynchronized sampling and non-integral period truncation.An accurate method for power harmonic analysis based on new window double-spectrum-line interpolation fast Fourier transfomi(FFT) is proposed,the applicable rectification formulas of the double-spectrum-line interpolation is obtained by using polynomial curve fit functions.The test shows that the new method has higher calculation accuracy and is more practical in the calculation of frequency,amplitude and phase.

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Key concepts: Fast Fourier transform, Rectification, Interpolation (computer graphics), Window function, Spectral leakage, Mathematics, Harmonic analysis, Window (computing)