Elimination of selective harmonics in a Multi-Level Inverter

This paper presents a selective harmonics elimination in Multi-Level Inverter. The basic concept of this reduction is to eliminate specific harmonics, which are generally of the lowest orders, 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 non-linear transcendental equations with a much simpler formulation and without complex analytical calculations for any number of voltage levels. Also several informative simulation results verify the validity and effectiveness of the proposed algorithm.