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Mitigation of Voltage Sags/Swells to Enhance Power Quality of Distribution System Using a Custom Power Device (DVR)

Tripti Shahi, K.P.Singh

Custom power is a concept based on the application of power electronic controllers in distribution system to improve the power quality. Dynamic Voltage Restorer (DVR) is one of the custom power devices that can mitigate voltage sag/swell, unbalance and voltage harmonics originating from supply side. DVR has become very popular in recent years in both low voltage and medium voltage applications. In this paper modelling and simulation of DVR, its functions, configurations, components and various control strategies are presented. DVR is fast, flexible and efficient solution to voltage sag problem. This paper discussed abc to dqo base new control algorithm to generate the pulses. This control scheme is simple to design and has excellent voltage compensation capabilities. New discussed case in this paper is supply voltage containing harmonics. Effectiveness of proposed technique is investigated through computer simulation by using MATLAB/SIMULINK software. The simulation results have shown validation of the control system.