Analysis of a Novel Dead-time Compensation Technique for Three Phase Space-vector Pwm Based Vsi Drives

Due to the finite turn on and turn off times of switching devices typically a dead-time is inserted in between the off going and turning on devices to prevent a shoot through in the DC link. Even though this assures safe operation several undesired attributes such as fundamental voltage drops, output waveform distortions & torque pulsations are also introduced as a result of this time delay. This paper introduces a novel dead time compensation technique for space vector PWM based voltage source inverters and also a detailed examination of the distortion caused by dead-time is presented. Using the proposed method dead-time is compensated accurately resulting a better frequency spectrum. Time domain and frequency domain results both are presented to verify the findings.