Dynamic Voltage Restorer (DVR) is one of the custom power devices that are used as an effective solution for the protection of sensitive loads against voltage disturbances in power distribution system. The efficiency of the DVR depends on the performance efficiency of the control technique involved in switching the inverters. This paper gives a systematic approach of the design of dynamic voltage restorer using sinusoidal pulse width modulation and unipolar hysteresis voltage control. . DVR is a series connected device used for compensating voltage sags and swells on the distribution side. In this work, a step by step procedure is given to figure out the components that are required for the design and simulation of DVR. The detection of sags/swells is carried out with the help of dqo theory, whereas the control of the voltage source inverter is done with the help of SPWM and bipolar hysteresis voltage control. The simulation of the proposed work is carried out with the help of MATLAB/ SIMULINK and the results were found to be in accordance with theory.

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