Abstract：The fast Fourier transform (FFT) is a commonly analysis algorithm for harmonics. The windowed interpolation FFT algorithm can effectively reduce spectrum leakage and fence effect in addition to reducing the amount of calculation. However, the number of sampling data must satisfy certain conditions when applying the FFT algorithm. Aiming at the problem that non-2 integer power data series cannot use fast Fourier transform, the spectrum distribution of conventional mixed-base FFT algorithm is analyzed and studied in this paper. And this paper proposes a multi-spectrum-Line interpolation analysis algorithm based on the mixed radix FFT. The proposed algorithm used four spectral lines to correct the calculation result of the mixed-base FFT operation, and the principle and process of the proposed algorithm were derived and analyzed in detail. The simulation results show that compared with the conventional mixed-base FFT algorithm and zero-padded FFT algorithm, the proposed algorithm has higher accuracy of harmonic analysis under the condition of non-2 integer power.
王保帅, 肖勇, 胡珊珊, 赵云. 适用于非整数次幂的高精度混合基FFT谐波测量算法[J]. 电工技术学报, 2021, 36(13): 2812-2820.
Wang Baoshuai, Xiao Yong, Hu Shanshan, Zhao Yun. High Precision Mixed Radix FFT Algorithm for Harmonic Measurement under Non-integer Power Sequence. Transactions of China Electrotechnical Society, 2021, 36(13): 2812-2820.
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2021, Vol. 36 
