Authors
Abstract
provide the exact on-line solution to the optimal PWM problem. The proposed
algorithm optimization technique is applied to a 3-level unipolar single-phase inverter to
determine optimum switching angles for eliminating low order harmonics while maintaining
the required fundamental voltage to drive single-phase induction motor with high quality.
The proposed HE method contributes to the existing methods because it not only generates
the desired fundamental frequency voltage, but also completely eliminates any number of
harmonics. It provides high quality sine-wave output voltage on the induction motor
terminals with very low THD.
The high quality sinusoidal output voltage produced by the inverter at different number
of switching angles is presented. The complete solutions for 3-level unipolar switching
patterns to eliminate the 3rd and 5th harmonics are given. Finally, the unipolar case is again
considered where the first 14 harmonics are eliminated.
Keywords
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