DENSITÉ SPECTRALE DE PUISSANCE D'UNE DOUBLE MODULATION DE LARGEUR D'IMPULSIONS DISCONTINUES ALÉATOIRES
DOI :
https://doi.org/10.59277/RRST-EE.2023.68.2.3Mots-clés :
Modulation de largeur d'impulsion aléatoire (RPWM), Modulation discontinue de largeur d'impulsion (DPWM), Pertes de commutation, nterférence électromagnétique (EMI), Densité spectrale de puissanceRésumé
Cet article traite des caractéristiques spectrales d'une technique de modulation de largeur d'impulsion discontinue aléatoire (DRDPWM) basée sur la porteuse pour réduire les EMI conduites et les pertes de commutation dans les onduleurs à source de tension triphasée. Il combine deux schémas aléatoires simples, la modulation de fréquence porteuse aléatoire (RCF-DPWM) et la modulation de position d'impulsion aléatoire (RPP-DPWM). Dans un premier temps, le principe de modulation du DRDPWM est présenté. Ensuite, les expressions analytiques de la densité spectrale de puissance (PSD) qui caractérisent la tension de sortie de l'onduleur triphasé sont dérivées. Les résultats d'analyse et de simulation montrent l'efficacité de l'étalement PSD du DRDPWM. Enfin, les résultats expérimentaux vérifient les résultats analytiques et de simulation et prouvent l'efficacité du schéma DRDPWM dans l'étalement du spectre par rapport aux schémas simples (RPP-DPWM et RCF-DPWM) et au schéma classique DPWM.
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