Velocity Control of 3 Phase Induction Motor V/F Technique by Using Space Vector Modulation

This thesis presents the need of Speed Control in the Induction Motors. Out of the so many methods of controlling Induction motors, V/f Control has proven to be the most versatile. The overall system of implementing V/f control has been offered. One of the basic requirements of this scheme is the PWM Inverter. In this, PWM Inverters have been modeled and their outputs fed to the Induction Motor drives. The uncontrolled of transient and steady state response of the Induction Motor has been obtained and the analyzed. A MATLAB code was developed to successfully implement Open Loop V/f Control on a PWM-Inverter fed 3-phase Induction Motor, and the Torque was found to be constant for the various rotor speeds. This was followed by the MATLAB model for Closed-Loop V/f Control on the PWM-Inverter fed 3-phase Induction Motor. It was the observed that using a Closed-Loop system with a Proportional Controller gave a very better way of controlling the speed of an Induction motor as maintaining a constant maximum torque.This thesis presents the need of Speed Control in the Induction Motors. Out of the so many methods of controlling Induction motors, V/f Control has proven to be the most versatile. The overall system of implementing V/f control has been offered. One of the basic requirements of this scheme is the PWM Inverter. In this, PWM Inverters have been modeled and their outputs fed to the Induction Motor drives. The uncontrolled of transient and steady state response of the Induction Motor has been obtained and the analyzed. A MATLAB code was developed to successfully implement Open Loop V/f Control on a PWM-Inverter fed 3-phase Induction Motor, and the Torque was found to be constant for the various rotor speeds. This was followed by the MATLAB model for Closed-Loop V/f Control on the PWM-Inverter fed 3-phase Induction Motor. It was the observed that using a Closed-Loop system with a Proportional Controller gave a very better way of controlling the speed of an Induction motor as maintaining a constant maximum torque.