Voltage Sag Mitigation in a Three-Phase Induction Motor using DSTATCOM and DVR

Voltage sag in distribution system is one of the most frequently occurring power quality problem, There are many solutions to mitigate voltage sag. This paper describes one such technique to mitigate voltage sag occurring during the starting of three-phase induction motor by using power electronic devices called Dynamic Voltage Restorer (DVR) and Distribution Static Compensator (DSTATCOM). This paper is organized with a brief introduction of voltage sag and its characteristics, structure and control principles of DSTATCOM and DVR. The performance of both DSTATCOM and DVR to mitigate voltage sag caused by starting of three phase induction motor is observed and compared. The simulation models of both the devices are analyzed and results are shown.