A topology, so called, Double-Delta Sourced Winding (DDSW) has been proposed to improve harmonic properties in high-power conversion systems. In this paper, a pulse-width modulation method is proposed to further optimize the harmonic properties in DDSW-based systems. Specifically, it is described through mathematical analyses how to modify voltage references for reducing harmonics in combination with DDSW. The effectiveness of the proposed method is assessed with experimental results. As a result, the proposed method revealed 40% further reduction of harmonic current.
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