Speed Control of Vector Controlled Induction Motors Using Integral-Proportional Controller

Control of Induction Motor (IM) is well known to be difficult owing to the fact the mathematical models of IM are highly nonlinear and time variant. The advent of vector control techniques has solved induction motor control problems. The most commonly used controller for the speed control of induction motor is traditional Proportional plus Integral (PI) controller. However, the conventional PI controller has some demerits such as: the high starting overshoot in speed, sensitivity to controller gains and sluggish response due to sudden change in load torque. To overcome these problems, replacement of PI controller by Integral plus Proportional (IP) controller is proposed in this paper. The goal is to determine which control strategy delivers better performance with respect to induction motor’s speed. Performance of these controllers has been verified through simulation using MATLAB/SIMULINK software package for different operating conditions. According to the simulation results, IP controller creates better performance in terms of overshoot, settling time, and steady state error compared to conventional PI controller. This shows the superiority of IP controller over conventional PI controller.