Asymmetrical multilevel inverter for higher output voltage levels

Now a days the growth of interest in multilevel inverters has been increasing because there are enormous applications of there in FACTS and industrial drives etc., Although there are many topologies of multilevel inverters in literature, popular among them are cascaded H-bridge. In general the control methods of these cascaded inverters are designed an assumption of having all dc source voltages same for all H-bridges. This paper discusses the abilities of cascaded multilevel inverter to produce more output voltage levels with same number of H-bridges, but with different input voltage ratios. The ideal nature of input dc voltage sources is shown as an advantage in this paper. The proposed inverter is then used to feed an induction motor drive and the simulation results are shown.