Study on Compensation of Voltage Sag and Voltage Swell by Using DVR (Dynamic Voltage Restorer)

Significant feature for electrical engineering is quality of power in modern days. Due to growing use of solid state, non-linear, power semiconductor switching devices power quality issues are formed. A power quality crisis refers to the problems that are cause by the increase of a non standard voltage or current or frequency. Because of this it results into the stoppage of the equipments in use. Significant problem in quality of power is voltage sag and voltage swell. The speedy progress in electronics has completed it feasible to diminish power quality troubles. Like, DVR afford most commercial result to recompense voltage sags and voltage swells by boosting voltage in the responsive structure. DVR is series connected electronic device which can moderate the quality of power troubles in the scheme and re-establish the load voltage to the pre-fault rate. From the paper it gives an introduction about power quality troubles after then it gives information about compensate devices and introduction, operation control strategies, compensation methods of DVR.