Abstract
This paper describes the mitigation of voltage sag by using custom power devices. One of custom devices is Dynamic Voltage Restorer(DVR) through which the power quality problems are being studied. As voltage restoration process involves real power injection into the distributed feeder, the capability of a particular DVR topology, especially for compensating voltage sag for long duration that depends upon the energy storage of the DVR. Different solutions have been developed to protect sensitive loads against such disturbances but the DVR is considered to be the most efficient and effective solutions. Since it includes lower cost, small size and its dynamic response to the disturbance. The simulation results were presented to illustrate and understand the performance of DVR under voltage sag conditions.
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