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Comparison of Neutral-Point-Clamped, Symmetrical, and Hybrid Asymmetrical Multilevel Inverters

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3 Author(s)
Diorge A. B. Zambra ; Departamento de Ciências Exatas e Tecnologias, Universidade de Caxias do Sul (UCS) , Caxias do Sul, Brazil ; Cassiano Rech ; José Renes Pinheiro

This paper presents a comparison of three topologies of multilevel inverters applied to drive an induction motor of 500 kVA/4.16 kV rating. The multilevel inverters analyzed are the following: a neutral-point-clamped inverter, a symmetrical cascaded multilevel inverter, and a hybrid asymmetrical cascaded multilevel inverter. The performance indexes used in the comparison are total harmonic distortion, first-order distortion factor, second-order distortion factor, common-mode voltage, semiconductor power loss distribution, and heat-sink volume. The multilevel inverters are designed to present 99% efficiency at the nominal operating point, and the aforementioned performance indexes are compared for distinct values of amplitude modulation depth.

Published in:

IEEE Transactions on Industrial Electronics  (Volume:57 ,  Issue: 7 )