A Novel Structure of Cascaded Multilevel Inverter with High Voltage Level Generation Capability using Reduced Components

Abstract

A novel cascaded multilevel inverter structure is presented in this paper. The presented topology possesses the capability to generate large number of voltage levels at output terminals using significantly lower number of components. The basic unit of proposed topology is asymmetric in nature and can produce 35 levels using 6 unidirectional switches and 4 bidirectional switches and 6 input dc sources of magnitude V/2, V/2, V, V, 3V, 3V. Further, cascaded MLI structure has been developed by using the proposed basic unit. The cascaded structure can produce better quality of output voltage using minimum components. The proposed topology has been compared with the relevant recently developed topologies with respect to different perspective such as required switching devices, isolated dc sources, gate driver circuit for generating specific voltage level. Further, the stress voltages across the switches have been evaluated and compared with the other topologies. It is observed that the topology requires minimum components and provides minimum Total standing voltage for generating specific output level with respect to other topologies. The effectiveness of proposed topology is verified by an extensive simulation study of 35 level MLI structure with different load condition such as RL, L, and sudden load change condition.