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A High Accuracy Harmonic Analysis Method Based on All-Phase and Interpolated FFT in Power System

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4 Author(s)
Xiaodan Yan ; Sch. of Electr. & Inf. Eng., Xihua Univ., Chengdu, China ; Shibing Tan ; Jun Wang ; Ying Wang

Nowadays, the Fast Fourier transform (FFT) has been widely adopted for harmonic analysis in power system. However, a direct application of FFT-based algorithms may bring about inaccurate results because of spectral leakage and picket-fence effects. In this paper, a high accuracy method based on the all-phase and interpolated FFT is presented for harmonic analysis. Firstly, the input signal is preprocessed to mitigate spectral leakage through all-phase. Secondly, the interpolation algorithm is adopted to eliminate the picket-fence effects. As a result, the analysis accuracy of the harmonic parameters has been greatly improved and the phase estimation is not biased. The formulas of amplitude, frequency and phase are also obtained based on all-phase and interpolated FFT. The simulation results reflect that this method can better meet the requirements of harmonic detection in power system.

Published in:

Power and Energy Engineering Conference (APPEEC), 2011 Asia-Pacific

Date of Conference:

25-28 March 2011