Direct torque control of induction motor using three level diode clamped multilevel inverter

In this paper the three level diode clamped multilevel inverter fed direct torque control of induction motor is proposed. The proposed multilevel inverter has the advantages of less harmonics in the output and low torque ripples. The switching table direct torque control scheme is adopted due to the simplicity of the control algorithm. The PI speed controller is used in the outer loop. To demonstrate the performance of proposed multilevel inverter fed direct torque control, the simulations are carried out for constant speed under constant load, constant speed under step change in load and step change speed under constant load conditions and the results are presented. The comparison of the dynamic and steady state performance in terms of torque ripple and settling time of the two level inverter and three level inverters are presented.