COMPARATIVE STUDY OF VECTOR CONTROL OF INDUCTION MOTOR DRIVE (VCIMD) USING DIFFERENT SPEED CONTROLLER

Abstract

The Vector Control technique allows the dynamic control of induction motors in particular to a performance level comparable to that of a DC machine. Various control methods of induction motor drive like voltage control, voltage and frequency control, current control etc, provide steady state performance, but their dynamic response is poor. The vector control technique, which is also called as Field Oriented Control (FOC), allow a squirrel cage induction motor to be driven with high dynamic performance that is comparable to the characteristics of DC motor. The vector control technique decouples the stator current in two component: one for the control of torque and other for controlling flux. The vector control technique can further classified into direct vector control and indirect vector control. In this technique the stator currents are converted to a fictitious Synchronously Rotating Reference Frame (SRRF) with the flux vector. In this work, Vector Control Induction Motor drive (VCIMD) has been modelled in MATLAB and simulated under different operating conditions like step change in speed, speed reversal, load perturbation and starting. Further, the dynamic response of the VCIMD depends on the type of speed controller used in the closed loop operation. The different speed controller used in the VCIMD are proportional integral (PI),fuzzy logic (FL), hybrid (PI and FL),Fuzzy Pre- compensated proportional integral (FPPI), Anti windup proportional integral(PI) and Posicast speed controller. A comparative study of the response obtained from VCIMD is carried out with different speed controller using MATLAB Simulink software