Hybrid Fuzzy and PID controller based inverter to control speed of AC induction motor

The usage of the AC induction motor (ACIM) becomes widely increased in the industrial applications as well as domestic usage, due to the new technologies of the electronic switching technologies. The speed of the ACIM is achieved through the control of the frequency of the applied voltage to the IM, this is achieved by using the inverter, whose output frequencies lies between (20 and 60) Hz. The performance of inverter will be enhanced by adding a Hybrid Fuzzy Logic Controller and PID controller to enhance the speed controller of the ACIM. A Hybrid fuzzy logic controller (FLC) and proportional-integral derivative (PID) control of an inverter for single phase AC Induction motor is described in this paper. The output voltage error and its derivative are used as input variables for the FLC to adjust the error of the system, it will be added to the output of the PID controller to enhance the performance of the system and minimize steady state error for the speed of the motor. Microcontroller (PIC16F877A) was used to generate the pulse width modulation (PWM) and to generate internal sine wave with variable frequency to control the speed of the motor accordingly.