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.
- multilevel inverter
- neutral point clamped
- power semiconductor devices
- semiconductor diodes
Adam, G. P., Finney, S. J., Massoud, A., & Williams, B. W. (2008). Capacitor balance issues of the diode-clamped multilevel inverter operated in a quasi two-state mode. IEEE Transactions on Industrial Electronics, 55(8), 3088-3099. https://doi.org/10.1109/TIE.2008.922607