IMPLEMENTATION OF INTELLIGENT CONTROLLER FOR THREE PHASE VECTOR CONTROLLED INDUCTION MOTOR

Abstract

Induction motors are widely used in industry due to the fact that they are relatively cheap, rugged and require less maintenance. In the past few decades various control methods have been reported to control torque and speed of three phase Induction motor. The Vector control has widespread use in high performance induction motor drives. It allows a decoupled control of electromagnetic torque control and the motor flux, and hence the induction motor is operated as DC motor. In this technique, the variables are transformed into a reference frame in which the dynamic variables behave like DC quantities. The decoupling control between the flux and torque allows induction motor to achieve fast transient response. Therefore, it is preferred used to use it in high performance motor applications. The motivation behind this project is to implement an intelligent control scheme for a three phase vector controlled induction motor drive. The speed controller is employed in the outer loop. The complete vector control scheme of the IM drive incorporating a PI-Controller & an FLC is experimentally implemented using a digital signal processor board DS-1104 in the laboratory on a 3-hp, 230 V, 1440rpm, 3 phase Induction motor. A comparison of the drive performance using a conventional PI and an intelligent Fuzzy Logic controller is presented through simulation in MATLAB/SIMULINK as well as through real time implementation of the scheme.