A Dual Seven-Level Inverter Supply for an Open-End Winding Induction Motor Drive
Mondal, G.; Sivakumar, K.; Ramchand, R.; Gopakumar, K.; Levi, E.
Industrial Electronics, IEEE Transactions on
Volume 56, Issue 5, May 2009 Page(s):1665 - 1673
Digital Object Identifier   10.1109/TIE.2008.2010159
Summary:This paper develops a seven-level inverter structure for open-end winding induction motor drives. The inverter supply is realized by cascading four two-level and two three-level neutral-point-clamped inverters. The inverter control is designed in such a way that the common-mode voltage (CMV) is eliminated. DC-link capacitor voltage balancing is also achieved by using only the switching-state redundancies. The proposed power circuit structure is modular and therefore suitable for fault-tolerant applications. By appropriately isolating some of the inverters, the drive can be operated during fault conditions in a five-level or a three-level inverter mode, with preserved CMV elimination and DC-link capacitor voltage balancing, within a reduced modulation range.

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