Selective harmonics elimination for three-phase seven-level CHB inverter using backtracking search algorithm

Abstract

This paper introduces backtracking search algorithm (BSA) to solve the nonlinear transcendental equations to obtain triggering angles of a three phase seven-level cascaded H-bridge (CHB) inverter and also eliminates 5th and 7th order harmonics while satisfying the requested fundamental component. A comparative study has been made in terms of execution time, the statistical probability of achieving global minima, and a rank of convergence rate to establish the supremacy of the BSA optimisation technique over other recognised methods such as genetic algorithm, BEE algorithm, and particle swarm optimisation techniques. Simulation and experimental results confirm the effectiveness and accuracy for obtaining precise switching instants that fruitfully satisfy the required output voltage quality.

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