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Selective harmonic control: A general problem formulation and selected solutions
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DOI：10.1109/TPEL.2005.857541.png)
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Abstract
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Selective harmonic elimination/control has been a widely researched alternative to traditional pulse-width modulation techniques. Previous and current work has made fundamental assumptions that enforce output waveform quarter-wave symmetry, presumably in order to reduce the complexity of the resulting equations. However, the quarter-wave symmetric assumption is not strictly necessary. It restricts the solution space, which can result in sub-optimal solutions with regards to the uncontrolled harmonic distribution. A more general formulation is proposed, removing the quarter-wave symmetry constraint for two classes of the m-level, n-harmonic harmonic control problem. The special cases of two- and three-level harmonic elimination are presented in detail along with representative solutions for each harmonic control problem. New solutions previously unattainable based on quarter-wave symmetric techniques are identified.
Keywords:
harmonic control
harmonic elimination
harmonic reduction
harmonics programmed pulse-width modulation (PWM)
selective harmonic elimination (SHE)
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