A Novel Asymmetrical Multilevel Inverter with Switched Capacitor Units for AC Motor

Abstract

 Multilevel power converter structure has been introduced as an alternative in high power and medium voltage situations. A multilevel converter not only achieves high power ratings, but also improves the performance of the whole system in terms of harmonics, dv/dt stresses, and stresses in the bearings of a motor. Moreover the advantages like high quality power output, low switching losses, low electro-magnetic interference (EMI) and high output voltage made multilevel inverter as a powerful solution in converter topology. In this paper two new topologies have been proposed for multilevel inverters. The proposed topologies consist of a combination of the conventional series and the switched capacitor inverter units.  The proposed method introduces 17, 25 levels and three phase 25level Inverter,  With the use of high level inverter, resolution is increase and also the harmonics is highly reduced. The simulation results are presented by using Matlab/Simulink software.