Commande par gradins d'un convertisseur multiniveau asymétrique à structure cascade pour l'entraînement d'une machine asynchrone

Abstract

- This paper consists in studying the asymmetric multi-level inverter control applied to the driving of a three-phase asynchronous machine. This type of inverter has been studied because it is capable of generating quasi-sinusoidal voltages with an odd number of levels that can reach between 2K + 1 and 3K levels (K: full bridge cells). The use of the multi-level cascade structure to improve the output voltage quality much more without increasing the number of full bridge inverter cells as well as this structure is of interest because it contains a reduced number of switches in comparison with others. For the variable speed training for this machine, the vector control with conventional correctors is then applied. The simulation results confirm the validity and efficiency of this type of inverter