Investigation of the Impact of Different PWM Techniques on Rectifier-Inverter Fed Induction Motor Drive

The paper investigates the technology status of recently developed different pulse width modulation (PWM) techniques for rectifier inverter-fed induction motor drive (IMD). The PWM technique used in inverter switching has significant impacts on the performance parameters of IMD. A group of power-quality indices, such as total harmonic distortion (THD) and distortion factor (DF) of ac mains current, input power factor, THD of supply voltage at point of common coupling (PCC), dc-bus-voltage ripple, power loss due to inverter switching and torque ripple for a IMD are considered as the major performance parameters of IMD. At motor side, a 2 level-3 phase voltage source inverter is used, which is fed from a 6-pulse diode rectifier. Different conventional and advanced PWM techniques such as sinusoidal PWM (SPWM), third harmonic injected PWM (THPWM), conventional space vector PWM (CSVPWM), trapezoidal PWM (TRPWM), and bus clamping PWM (BCPWM) are applied for inverter switching for a 6 pulse diode rectifier-2 level 3 phase voltage source inverter (VSI) fed IMD to investigate the power quality indices mentioned above. The performance of different PWM techniques for IMD is also compared to give a clear message to the industrial community for selecting appropriate modulation technique for VSI based on different power quality parameter. The performances of IMD are examined in MATLAB/Simulink environment against different PWM techniques for VSI.