Now a days the Power Quality problems is one of the major concerns it associates a wide range of disturbances such that the voltage sags/swells, flicker, harmonics distortion, impulse transient, and interruptions. As compared to the other power quality problems Voltage sags/swells can occurs more frequently than other. In the power distribution system these sags/swells are the most important power quality problems. To regulate these problems one of the most important custom power devices that

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... s been emerged to improve the performance of power quality by using Dynamic Voltage Restorer (DVR). DVR is a series connected compensator; in this the voltage can be injected in series. At the point of common coupling the DVR maintains the load voltage at a nominal magnitude and phase by compensating the voltage sag/swell, voltage unbalance and voltage harmonics presented. These systems are able to compensate voltage sags by increasing the appropriate voltages in series with the supply voltage, and therefore prevent loss of power. In this project, DVR can be analyzed by using a different voltage injection schemes. By using battery energy storage system (BESS) the rating of DVR will be reduced. For controlling the capacitor-supported DVR a new control technique is proposed. With a reduced rating voltage source converter (VSC) the control of DVR is demonstrated. By using the unit vectors reference load voltage is determined. Synchronous reference frame theory (SRF) is used for the conversion of voltages from rotating frame to the stationary frame. By using MATLAB results are verified. This entire module is developed in SIMULINK.