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A Multi-Level Inverter Structure with Cascaded Two-Level and Three-Level Inverters for IM Drive with CMV Elimination and DC-Link Capacitor Voltage Balancing

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4 Author(s)
Mondal, G. ; Indian Inst. of Sci., Bangalore ; Gopakumar, K. ; Tekwani, P.N. ; Levi, E.

Common mode voltage (CMV) variations in PWM inverter-fed drives generate unwanted shaft and bearing current resulting in early motor failure. Multilevel inverters reduce this problem to some extent, with higher number of levels. But the complexity of the power circuit increases with an increase in the number of inverter voltage levels. In this paper a five-level inverter structure is proposed for open-end winding induction motor (IM) drives, by cascading only two conventional two-level and three-level inverters, with the elimination of the common mode voltage over the entire modulation range. The DC link power supply requirement is also optimized by means of DC link capacitor voltage balancing, with PWM control, using only inverter switching state redundancies. The proposed power circuit gives a simple power bus structure.

Published in:

Industry Applications Conference, 2007. 42nd IAS Annual Meeting. Conference Record of the 2007 IEEE

Date of Conference:

23-27 Sept. 2007