Operation and Control of Single-Phase DVR based on SOGI-PLL

This paper introduces a control algorithm for generation of reference voltages based on single-phase SOGI (Second Order Generalized Integrator) for DVR (Dynamic Voltage Restorer). The proposed DVR is a series active compensator used for compensation of voltage sag and swell to the desired level. The proposed control algorithm is capable of generating reference voltages in sag, swell and phase jump conditions. The controller is providing the solution for voltage sag and swells with and without phase jump and improving the power quality. In this paper, SOGI-PLL (Phase-Locked Loop) is chosen because of its dynamic response, tracking accuracy and faster detection under all varying grid conditions. The control algorithm is tested and evaluated using MATLAB/Simulink and has proved effective.