期刊
IEEE TRANSACTIONS ON POWER ELECTRONICS
卷 34, 期 1, 页码 7-12出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TPEL.2018.2833148
关键词
Capacitor voltage balancing; carrier-overlapped pulsewidth modulation (COPWM); multilevel converter; neutral-point clamped (NPC); volt-second balance
资金
- National Natural Science Foundation of China [51407101]
Neutral-point clamped (NPC) multilevel converters with more than three voltage levels are hard to balance the dc-link capacitor voltages, which limits their application in the industry. In order to solve the neutral-point potential balancing problem of four-level NPC converters, a novel carrier-overlapped pulsewidth modulation (PWM) method is proposed in this letter, which satisfies the volt-second balance principle and can achieve the natural voltage balance of three dc-link capacitors under ideal and steady states. Experimental results are presented to confirm the validity of this PWM method.
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