Design and Fabrication of Three Phase PWM Rectifier for Improvement of Power Factor

Abstract

Today, when the world is heading towards the acme of technology, power electronics field is seemed to be of great significance. Seeing to it power electronics converters are to be designed due to the booming requirement. Here in the below dissertation three phase ac to dc PWM(Pulse Width Modulation) rectifier is designed for achieving unity power factor in utility line current and voltage and simultaneously achieving constant dc at the output side. For achieving this task, simulation is developed by designing two control loops. One is inner current loop which deals with ac quantity and maintains unity power factor at the input and outer voltage loop which deals with dc quantity and maintains constant dc. The technique for the PWM(Pulse Width Modulation) pulses which are to be implemented for the swiching device is SPWM(Sine Triangular Pulse Width Modulation) technique. With that fabrication work is to be carried out for achieving the above aim. For generating the SPWM(Sine Triangular Pulse Width Modulation) pulses for the hardware set up PIC(Peripheral Interface Controller) microcontroller is used. SPWM pulses are obtained through PIC controller. Here the SPWM(Sine Triangular Pulse Width Modulation) pulses should be developed and implemented through PIC(Peripheral Interface Controller) such that unity power factor and constant dc at the output are achieved. This converter provides with fast dynamic response and low.