Pulsewidth Modulation Strategy in Double-Delta Sourced Winding

Power conversion systems based on double-delta sourced winding (DDSW) had an optimization issue in terms of pulsewidth modulation (PWM). This issue was about inefficient employments of voltage levels during PWM and had to be considered for minimizing voltage stresses and current ripples on DDSW. In this paper, a novel method has been proposed to improve the performance of PWM in DDSW-based systems. The proposed method can be simply implemented as a carrier-based PWM and its principles are neatly summarized with equations. Finally, the effectiveness of the proposed method is demonstrated with experimental results, which were obtained by using a transformer and an induction machine.