A strategy of 'group-harmonic' identification is proposed for re-evaluating harmonic levels in power systems. The proposed strategy can relieve the problem of spectral leakage in the conventional application of the fast Fourier transform (FFT). Incorporating group-harmonic identification, the FFT algorithm can retain its efficiency for accurate harmonic calculations, especially for power systems with nonstationary waveforms.
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C.S. Moo (1995) studied this question.
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