Capacitor Balance Issues of the Diode-Clamped Multilevel Inverter Operated in a Quasi Two-State Mode
Adam, G.P.; Finney, S.J.; Massoud, A.M.; Williams, B.W.
Industrial Electronics, IEEE Transactions on
Volume 55, Issue 8, Aug. 2008 Page(s):3088 - 3099
Digital Object Identifier   10.1109/TIE.2008.922607
Summary:A new operational mode for diode-clamped multilevel inverters termed quasi two-level operation is proposed. Such operation aims to avoid the imbalance problem of the dc-link capacitors for multilevel inverters with more than three levels and reduces the dc-link capacitance without introducing any significant voltage ripple at the dc-link nodes. The proposed operation can be generalized for any number of levels. The validity of the proposed multilevel inverter operational mode is confirmed by simulations and experiments on a prototype five-level diode-clamped inverter.

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