Voltage Quality Improvement using Dynamic Voltage Restorer

Abstract: Power quality is one of major problems in the presence era. It has become importance especially, with the introduction of sophisticated devices, whose performance is very sensitive to quality of power supply. power quality problem is an occurrence manifested as a nonstandard voltage,current,or frequency that results in a failure of end use euipement.One of the major problem deal here is the voltage sag. To solve this problem, custom power devices are used. One of those devices is the Dynamic Voltage Restorer (DVR),which is the most effective modern custom power device used in power distribution networks.Its appeal includes lower cost, smaller size, and its fast dynamic response to the disturbances