A Three-Phase Cascaded Multilevel Inverter Based on a New Basic Unit with less Number of Switches for Grid Applications

Abstract

In this paper Three-Phase Cascaded Multilevel Inverter Based on a New Basic Unit with Reduced Number of Power Switches for grid connected system is proposed. Thus multilevel inverter topologies are becoming more popular. A multilevel inverter topology is discussed. The inverter consists of series connection of a number of basic units. Therefore, multilevel inverters had been introduced and are being developed now. With an increasing number of dc voltage sources in the input side, a sinusoidal like waveform can be generated at the output. As a result, the total harmonic distortion (THD) decreases, and the output waveform quality increases, which are the two main advantages of multilevel inverters. In addition, lower switching losses, lower voltage stress of dv/dt on switches, and better electromagnetic interference are the other most important advantages of multilevel inverters. These features are obtained by the comparison of the conventional cascaded multilevel inverters with the proposed cascaded topology. The ability of the proposed inverter to generate all voltage levels (even and odd) is reconfirmed by using the simulation results of a 15-level inverter and three phase 15-level inverter with grid connected system. The simulation results are presented by using Matlab/Simulink Model.