Mitigation of Voltage Sag And Voltage Swell By Dynamic Voltage Restorer

This work deals with reducing major voltage flickering problems by using dynamic voltage restoration and SPWM technique it helps to improve the power quality of the system. Even though voltage swag and swell occurs in transmission as well as distribution side but the problem is resolved only at the distribution side. A systematic approach is made to assume the components needed to design the system. Voltage flickering is detected by using dqo theory and by using SPWM technique voltage is being controlled .Dynamic voltage restorer is attached in series that immediately detects the voltage flickering and reestablish high voltage to original value. This designed model also effectively clears the voltage flickering problem. Results are simulated using MATLAB Simulink, which explained the importance of the system.