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

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 t...

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Bibliographic Details
Main Authors: Mondal, G., Gopakumar, K., Tekwani, P.N., Levi, E.
Format: Conference Proceeding
Language:English
Subjects:
Capacitors
Induction motor drives
Induction motors
Motor drives
Pulse width modulation inverters
Stator windings
Switching circuits
Voltage control
Voltage fluctuations
Zero voltage switching
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Summary: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.
ISSN:0197-2618
2576-702X
DOI:10.1109/07IAS.2007.94