Selective harmonics elimination PWM applied to multilevel four-legs DC/AC converter based on particle swarm optimization

The present paper deals mainly with the application of the Selective Harmonic Elimination Pulse width Modulation SHE-PWM to Four-legs Multi-level DC/AC Converter based on an off-line meta-heuristic optimization algorithm. The main aim is to achieve the requirement of the elimination of the low order harmonics contained in the three-phases output voltages and the elimination of the zero component voltage at the terminals of the three-phase load independently of the nature of the load. The problem of the SHE-PWM is presented by a two constrained nonlinear objective functions that allow the calculation of the switching angles vector solution presenting the best minimal value for the objective functions independently. The results obtained with the present application show the effectiveness of the use of the SHE-PWM based on the Particle Swarm Optimization (PSO) to ensure the improvement of the output voltage quality of Four-legs Multi-level DC/AC Converter for four-wires power supply applications under simple and ease practical requirements.