2008•Jiangsu Electrical EngineeringRequires access

Power System Harmonic Measurement AnalysisBased on Windows and Interpolated FFT

Ding Li

Abstract

There is some leakage spectrum when measuring the harmonic with fast Fourier transform(FFT),which would lead to some error.Windowed interpolation is an effective algorithm to reduce the leakage,and improve the measurement precision of harmonic amplitude and phase.Interpolation algorithm on Hanning window and Blackman-Harris window,which are widely used in signal analysis,are introduced in this paper.Comparison and analysis on precision and complexity of the proposed algorithm are implemented,and the simulation results show the effectiveness and accuracy of the proposed algorithm.

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Key concepts: Fast Fourier transform, Window function, Spectral leakage, Interpolation (computer graphics), Window (computing), Leakage (economics), Algorithm, Harmonic