Simplified space vector based voltage modulation techniques for the mitigation of common mode voltage in induction motor drives

This paper presents a simplified space vector based pulse width modulation (SVPWM) techniques for the mitigation of common mode voltage (CMV) in direct torque controlled induction motor drive. In the proposed PWM method, simplified near state PWM algorithm (NSPWM) and active zero state based PWM algorithm (AZPWM6) is considered and the proposed algorithms switching times are calculated from the sampled phase voltages. Hence it reduces the complexity involved in calculation of sector and angle identification in comparison with the conventional space vector modulation technique. Moreover, in the proposed PWM algorithms active voltage vectors are used for the composition of reference voltage vector. To validate the proposed algorithm, simulation studies have been carried out using MATLAB-Simulink and results have been presented.