Implementation of Digital Filters to Improve Dynamic Response of A Single Phase PWM Rectifier

Abstract

In the realm of ac-dc power conversion, single-phase pulse width modulated (PWM) rectifiers are becoming more popular. A single-phase, single-switch boost rectifier is a well-known structure in this field. A high bandwidth current control loop is typically used to achieve minimal input current distortion and a high input power factor. The dynamic response of such a rectifier system to the input voltage and load disturbances is weak. A simple way to improve a rectifier’s dynamic response without harming its steady-state performance is provided here. MATLAB/Simulink was used to simulate this procedure. The voltage loop is designed using a fast controller with a digital filter that filters out low-frequency ripple at the controller’s output. This filter design has been proven to be simple enough to improve the dynamic responsiveness of a single-phase PWM rectifier.