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Multilevel converters for large electric drives

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3 Author(s)
L. M. Tolbert ; Oak Ridge Nat. Lab., TN, USA ; Fang Zheng Peng ; T. G. Habetler

This paper presents transformerless multilevel power converters as an application for high-power and/or high-voltage electric motor drives. Multilevel converters: (1) can generate near-sinusoidal voltages with only fundamental frequency switching; (2) have almost no electromagnetic interference or common-mode voltage; and (3) are suitable for large voltampere-rated motor drives and high voltages. The cascade inverter is a natural fit for large automotive all-electric drives because it uses several levels of DC voltage sources, which would be available from batteries or fuel cells. The back-to-back diode-clamped converter is ideal where a source of AC voltage is available, such as in a hybrid electric vehicle. Simulation and experimental results show the superiority of these two converters over two-level pulsewidth-modulation-based drives

Published in:

IEEE Transactions on Industry Applications  (Volume:35 ,  Issue: 1 )