Mitigation of Voltage Sag/Swell by Dynamic Voltage Restorer for Power Quality Improvement

Abstract

Power quality has become a major constraint for any type of load to get the better voltage quality. When the power quality is considered ,the voltage sag/swell plays predominant role at different types of loads which decreases the quality of voltage at consumer end. Inorder to overcome this situation, a Dynamic Voltage Restorer is connected in series to the system. Dynamic voltage restorer (DVR) is a series connected power electronic based device which will quickly mitigate the voltage sags in the system and restore the load voltage to the pre-fault value. DVR is considered as the best solution to overcome the problem of voltage sag/swell. The primary advantage of the DVR is keeping the users always on-line with high quality constant voltage maintaining the continuity of production. In this paper, the usefulness of including DVR in distribution system for the purpose of voltage sag and swell mitigation is described. Results of simulation using Matlab- Simulink are demonstrated to prove the usefulness of this scheme.