Power quality is one of the real worries in the present period. It has become important, especially, with the introduction of sophisticated devices, whose performance is very sensitive to the quality of power supply. A dynamic voltage restorer (DVR) based on photovoltaic (PV) generation/battery units is proposed to improve voltage quality in a micro-grid. The restorer is connected with the grid by a rectifier, which is in series with the point of common coupling (PCC). Power quality problem is an occurrence manifested as a nonstandard voltage, current or frequency that fails end-use equipment's. One of the major issues dealt here is the voltage sag. To take care of this issue, custom power gadgets are utilized. One of those gadgets is the Dynamic Voltage Restorer (DVR), which is the most productive and successful present-day custom power gadget utilized as a part of intensity dissemination systems. Its appeal includes lower cost, smaller size, and its fast dynamic response to the disturbance. This paper introduces power quality problems and diagram of Dynamic Voltage Restorer with the goal that youthful electrical designers come to think about such a cutting-edge custom power gadget for control quality change in the future era. © 2019 Elsevier B.V., All rights reserved.