Genetic algorithm (GA) based SHE technique applied to seven-level Nested Neutral Point Clamped (NNPC) Converter

This paper presents, selective harmonic elimination technique based on genetic algorithm applied to recently introduced seven-level Nested Neutral Point Clamped (NNPC) Converter. The Selective harmonic elimination (SHE) technique aims to eliminate lower order harmonic and maintain reference value of fundamental component. This demands the solution of nonlinear and transcendental equations. Thus, optimization problem has been formulated by defining proper objective function which covers all the constraints. GA is a matured and well known optimization algorithm, hence it is preferred to solve the concerned optimization problem. Solution gives the switching angles to switch the inverter. In this work, switching angles are determined offline for seven-level inverter, which are tuned for eliminating fifth and seventh harmonics. The MATLAB/SIMULINK software is used for comprehensive simulation of seven-level NNPC converter.