Dead time compensation in a vector-controlled induction machine

Dead time, which is inserted in PWM signals of VSIs, distorts the inverter output voltage waveforms and deteriorates the control performance of an induction machine by producing torque ripples. In this paper, a dead time compensation method in a vector controlled induction machine is proposed. The method is based on a feedforward approach that compensates the dead time effect by adding the compensating voltages to the inverter output voltage references in a two-phase stationary frame. The proposed method is only software intensive and easy to realize without additional hardware. Experimental results show the validity and effectiveness of the proposed method.