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This paper deals with simultaneous elimination of a number M of undesirable harmonics and variation of the output voltage in a pulse-width modulated (PWM) inverter. A general method of pulse-width modulation is suggested where the pulse positions are fixed for the elimination of M harmonics. Voltage control is then obtained by variation of the pulse width symmetricaly around the pulse position. By choosing M chops per quarter cycle, it is possible to eliminate M harmonics from the output. The theoretical results are experimentally verified. The proposed method is compared with the sinusoidal modulation technique and the Patel-Hoft method, and its advantages are discussed.
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Krishnamurthy et al. (1979) studied this question.
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