Multi level converters applied to the field oriented control of the machine induction

In this paper we study the vector control of induction machine by ring-a three-level inverter fed by a rectifier at three levels in NPC structure. The machine is controlled by the speed of the rotor flux oriented control (FOC). For this, we propose first the modeling and control of the two converters then we discuss the problem of stability of the DC voltages at the rectifier output. At the end we propose a clamping bridge to the input of the inverter a purpose we may well controlled the machine and remedy the problem of fluctuating tensions continues. The results may be obtained very satisfactory.