Speed Control of Induction Motors Using Hybrid Pi plus Fuzzy Controller

Abstract

The conventional speed controllers for vector control of induction motor drive (VC1MD) suffer from the problem of stability; besides, these controllers such as PD/PID controllers show either steady state error or sluggish response to the perturbation in reference setting or during load perturbation. In this paper, one method has been implemented on a 3 phase, 50 HP(37KW), cage type induction motor . According to this, a PI plus Fuzzy hybrid controller is implemented. At first, the PI controller is investigated for speed control of Induction Motor then Hybridization of fuzzy logic (FL) and PI controller for the speed control of given motor is performed to remove the disadvantages of FL controller (steady-state error) and PI controller (overshoot and undershoot). For experimental analysis, we have used MATLAB SIMULINK of Induction Motor. According to the simulation results, hybrid controller creates better performance in terms of rise time, overshoot, undershoot and settling time .The Comparison analysis shows that  in the PI controller it requires more settling time and steady state speed error but the speed response with this controller has no overshoot and settles faster in comparison with FL controller and it improves the torque disturbances rejections .