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| Power System Harmonic Analysis under Nonstationary Situations and Its Application Based on Improved FFT Method |
| Zeng Bo1, Teng Zhaosheng2, Zhou Yibo1 |
| 1. Guangxi Electric Power Research Institute Nanning 530023 China 2. Hunan University Changsha 410082 China |
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Abstract In this paper, the spectral characteristics of the cosine window are analyzed and an improved FFT method for harmonic analysis based on the even order cosine window (EOCW) is proposed. The rectification formulae of the frequency, amplitude and phase of the fundamental and harmonics are obtained by using the least squares fitting method. Simulation results indicate that, the precision in calculating harmonic parameters can be highly improved by the proposed algorithm, no matter with the fundamental frequency varies and the presence of interharmonics. The proposed algorithm is suitable for harmonic analysis under nonstationary situations and the correctness of which is verified by the application in embedded system.
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Received: 16 March 2011
Published: 20 March 2014
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2012, Vol. 27 
