Direct Torque Control Based on Shoot-Through States of an Induction Motor Fed by a Z-Source Three-Level Neutral Point Clamped Inverter.

This paper deals with an adaptive direct torque control of an induction motor fed by a Z-source three-level NPC (Neutral Point Clamped) inverter. The proposed control ensures simultaneously the buck-boost operation mode and the induction motor control. Indeed, a switching table, taking into account the Z-source structure, is developed for the direct torque control. In this context, shoot-through states of the Z-source three-level NPC inverter is applied in each sampling time of the direct torque control. The proposed system can be used as promising solution in event of sags voltage, improve power factor, and reduce harmonics. Experimental tests, carried out on digital development board, clearly demonstrate the feasibility and effectiveness of the proposed control. [ABSTRACT FROM AUTHOR]