Journal
IEEE TRANSACTIONS ON POWER ELECTRONICS
Volume 38, Issue 10, Pages 12024-12034Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TPEL.2023.3276895
Keywords
Common-mode voltage (CMV); multilevel converter; sawtooth-carrier-based pulsewidth modulation (PWM); switching loss
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This article proposes an asymmetrical switching pattern to eliminate common-mode voltage in multilevel converters while reducing switching loss. A simple sawtooth-carrier-based pulsewidth modulation scheme is proposed to implement this pattern without complicated computation. The effectiveness of the proposed method is demonstrated through simulations and experimental results.
This article proposes an asymmetrical switching pattern to eliminate common-mode voltage (CMV) in multilevel converters while reducing switching loss by rearranging the switching sequence to minimize the number of level-shifts. In contrast to the existing symmetrical switching pattern, this approach achieves CMV elimination without increasing switching loss. To implement this asymmetrical switching pattern, a simple sawtooth-carrier-based pulsewidth modulation scheme is proposed that avoids the need for complicated space vector modulation computation, particularly for high-level converters. The proposed method's effectiveness is demonstrated through simulations and experimental results for the three-phase cascaded H-bridge converter and boost seven-level active neutral-point-clamped converter.
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