Removal of Voltage Transients by PWM Switched Autotransformer & PI-Controller

Power quality has become a significant concern for the Electrical Engineers over the years. Among the numerous power quality issues, the most distinguished is the voltage sag. In this research, Pulse-Width Modulation (PWM) based switched autotransformer is used in order to recompense the depletion in voltage. This technique utilizes reduced number of switching devices per phase, lessened gate driver circuit size, the ability to preserve the desired undistorted load voltage, wholesomeness and quick response. Therefore, it is inferred that the load voltage is sustained in spite of the sag.