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Reduced common-mode modulation strategies for cascaded multilevel inverters

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4 Author(s)
Poh Chiang Loh ; Center for Adv. Power Electron., Nanyang Technol. Univ., Singapore ; D. G. Holmes ; Y. Fukuta ; T. A. Lipo

This paper presents modulation strategies for cascaded multilevel inverters that substantially eliminate common-mode voltage on the output phases. The paper begins by developing generic multilevel inverter reference waveforms that use only "allowed" space vectors to achieve reduced common-mode voltage. A graphical technique is then proposed that allows various carrier disposition modulation strategies for a diode-clamped inverter to be converted to equivalent modulation of a cascaded inverter for any fundamental reference waveform. This graphical technique is confirmed for both alternative phase opposition disposition and phase disposition equivalent modulation of a cascaded inverter, and is then used to create reduced common-mode modulation strategies for cascaded inverters from their equivalent counterparts for diode-clamped inverters under both continuous and discontinuous switching conditions. The strategies have been confirmed by both simulation and experimental results obtained using a cascaded five-level inverter.

Published in:

IEEE Transactions on Industry Applications  (Volume:39 ,  Issue: 5 )