Voltage Source Inverter Fed Induction Motor Drive

Abstract

This paper presents a three phase voltage source inverter used to control the speed of an induction motor.Induction motor speed control can be done by various techniques, here uses controlling of voltage for speed control.Here the voltage source inverter is operated at 180 degree conduction mode that is each power electronic switch is operated for 180 degrees.Simple pulse width modulation (PWM) is implemented with 180 degree conduction mode pulses and by controlling the duty cycle of the PWM output voltage can be controlled hence speed of induction motor can be controlled.Control pulses for the switches are generated by using PIC16F877A.Since the output voltage of microcontroller is 5V, which is not feasible for the proper switching of the MOSFET, here uses a driver circuit which consist of TLP250.