Réduction des perturbations conduites dans les convertisseurs de l’électronique de puissance par une commande en MLI aléatoire

Abstract

The purpose of this thesis is the reduction of conducted perturbations in power converters in order to comply better with electromagnetic compatibility (EMC) standards in power electronics. The use of Random Pulse Width Modulation (RPWM) for the control of DC-DC and DC-AC converters allows the spread of the voltage spectrum in a large frequency band and the reduction of the harmonics magnitudes. We propose a new RPWM scheme based on a triangular carrier with two randomized parameters, and then we develop a mathematical model of Power Spectral Density (PSD). PSD analysis and converters’ simulations reveal the EMC advantage of the proposed new scheme comparatively to the schemes using a single randomized parameter and proposed in the literature for DC-DC and DC-AC converters.