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A five-level inverter scheme with common-mode voltage elimination by cascading conventional two-level and three-level NPC inverters for an induction motor drive

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

Common-mode voltage generated by the PWM inverter causes shaft voltage, bearing current and ground leakage current in induction motor drive system, resulting in an early motor failure. This paper presents a common-mode elimination scheme for a five-level inverter with reduced power circuit complexity. The proposed scheme is realised by cascading conventional two-level and conventional NPC three-level inverters in conjunction with an open-end winding three-phase induction motor drive and the common-mode voltage (CMV) elimination is achieved by using only switching states that result in zero CMV, for the entire modulation range.

Published in:

Power Electronics and Applications, 2007 European Conference on

Date of Conference:

2-5 Sept. 2007

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