A Circuit Analysis on Multilevel-Inverter Using Multi string Topology for Minimize THD Profile

Abstract

This paper presents an evaluation of multi string multi-level inverter for a nine-level output. This multi-level inverter has the better comparative results in the form of THD, Losses and number of used devices The multi-string multi-level inverter comprises with eight power switches and 3 asymmetrical DC voltage for a nine-level output, this topologies has lower number of devices as compared with existing topology. Level-shifted pulse width modulation for triangular carriers is employed and compared in this study. The results of the comparative harmonic analysis are presented in the paper. Asymmetric DC voltages are used to get a higher number of levels, which is responsible for lower the THD profile. The multi-level inverter topology investigated is tested in steady-state and dynamic situations, as well as the findings are given. The simulation in the MATLAB® Simulink environment is used to carry out the analysis and verify its results.