| 摘要 |
The present invention measures the Fourier coefficients of each controlled harmonic in a signal beginning in a present cycle of the fundamental frequency with a switching angle corresponding to each controlled harmonic and predicts what these Fourier coefficients will be before the occurrence of a corresponding switching angle in a subsequent cycle. The present invention also predicts what these Fourier coefficients would be if the corresponding switching angle in the subsequent cycle is varied. Each switching angle is then varied in the subsequent cycle only if the associated harmonic would be improved thereby; otherwise, that switching angle in not varied in the subsequent cycle.
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