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Novel multilevel inverter carrier-based PWM method

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2 Author(s)
Tolbert, L.M. ; Oak Ridge Nat. Lab., TN, USA ; Habetler, T.G.

The advent of the transformerless multilevel inverter topology has brought forth various pulsewidth modulation (PWM) schemes as a means to control the switching of the active devices in each of the multiple voltage levels in the inverter. An analysis of how existing multilevel carrier-based PWM affects switch utilization for the different levels of a diode-clamped inverter is conducted. Two novel carrier-based multilevel PWM schemes are presented which help to optimize or balance the switch utilization in multilevel inverters. A 10 kW prototype six-level diode-clamped inverter has been built and controlled with the novel PWM strategies proposed in this paper to act as a voltage-source inverter for a motor drive

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Industry Applications, IEEE Transactions on  (Volume:35 ,  Issue: 5 )