Four quadrant comparative evaluation of classical and space vector PWM-directtorque control of a VSI fed three phase induction motor drive in MATLAB/SIMULINK environment

This paper presents the comparative evaluation of the performance of two most popular control strategies for induction motor drives: Classical DTC and SVPWM-DTC (in all four quadrants of operation). Though Classical DTC is a simple method, it suffers from the disadvantages like variable & high switching frequency and high torque & current ripples in steady state. SVPWM-DTC as a control strategy overcomes most the above mentioned drawbacks. The MATLAB / SIMULINK model of both Classical & SVPWM-DTC based induction motor drives are simulated in all four quadrants of operation (forward motoring, reverse motoring, braking and regenerative braking) and the simulations results are analyzed. The results make obvious that although both the schemes can be implemented in all the four quadrants, SVPWM has DTC has better steady state torque response than Classical DTC.