Generalized Discontinuous PWM Based Direct Torque Controlled Induction Motor Drive with a Sliding Mode Speed Controller

Minimum Switching Loss ADPWM Algorithm Based DTC Induction Motor Drive Operating at Near Rated Speeds

“…In this approach, the reference is provided as a voltage space vector, which is sampled once in every sub cycle and an average vector equal to the sampled reference vector is generated by time-averaging of the different voltage vectors produced by the inverter [6]. With a three-phase voltage source inverter (VSI) there are eight possible switching states.…”

“…Though conventional space vector pulse width modulation technique (CSVPWM) could able to make the switching frequency of the PWM inverter constant [3], [4], steady state ripple in torque, flux and current are still high predominantly when the drive is operating at high speeds. To improve the performance of the drive during high speed regions and to reduce the inverter switching losses, several discontinuous PWM methods (DPWM) are proposed in [5] - [6]. In this paper an ADPWM algorithm is proposed for reduced switching losses.…”