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.
No takes yet. Share an insight, caveat, or question.
Wang et al. (2018) studied this question.
Synapse has enriched 5 closely related papers on similar clinical questions. Consider them for comparative context: