Total Harmonic Reduction Using Switching Frequency in H-Bridge Cascaded Multilevel Inverter

Abstract

This paper presents total harmonics elimination in H-bridge Multi-Level Inverter. The basic concept of this reduction is to eliminate harmonics in different level with an appropriate choice of switching angles. This paper employs Homotopy algorithm to solve the transcendental equations for finding the switching angles. This method solves the nonlinear transcendental equations. It is much simpler formulation without complex analytical calculations for any number of voltage levels. In this technique, it is not required transformer allows the use of a single dc power source (e.g., a battery or a fuel cell stack) with the remaining n − 1dc sources being capacitors, which is referred to as hybridcascaded H-bridge multilevel inverter (HCMLI). It has several informative Mat lab simulation results verify the validity and effectiveness of the proposed algorithm.