ENHANCEMENT OF POWER QUALITY IN A CLOSED LOOP OPERATION OF FOURQUADRANT DC DRIVE USING DUAL AC-DC BUCK CONVERTER

K. Girish Kumar , K. Manoj Siva Kumar, CH.Srinivasulu Reddy

Abstract: This paper deals with the operation of the separately excited dc-drive in each of the four quadrants which is fed by symmetrical multi pulse modulated signal, leads to improved power quality by using single-phase, dual AC-DC buck converter. Here the armature control of the dc drive with constant load torque is considered in both forward and reverse directions in the motoring and generating actions. When a variable load condition occur the load voltage get changed, simultaneously other parameters such as torque, speed at load side and voltage, current profiles at source side get affected. Due to which there is lot of distortion in the sending end parameters. To overcome these drawbacks the essential variables are analyzed by feeding these variables back to the converter switches, which regulates the output voltage, fed to separately excited DC-Drive, which indicates that, at the ac interface the harmonic profile of the separately excited dc drive fed by the improved power quality dual converter is achieved using closed loop system

Keywords: AC-DC Buck Converter, Power Quality, Closed Loop, PI Controller, Symmetrical Multipulse Modulation (SMM) etc

DOI: https://doi.org/10.15623/ijret.2013.0209045