Modified Combined DTC and FOC Based Control for Medium Voltage Induction Motor Drive in SVM Controlled DCMLI

Abstract

Modified combined direct torque control (DTC) and field oriented control (FOC) based method is proposed in this paper to improve the performance of induction motor (IM) drive. The proposed method includes combined advantages of DTC and FOC schemes. An algorithm is developed for closed-loop control of the proposed control method and the scheme is implemented in space vector controlled five-level diode-clamped inverter. For this, an experimental prototype is developed to control three-phase, 3-hp IM drive. The comparative performance of proposed control method, DTC and FOC with experimental results in SVM controlled five-level inverter is presented to validate the effectiveness of the proposed control scheme. Also, the switching states are selected so as to control the inverter output voltage as well as reduce the common mode voltage (CMV) of the drive.