This document discusses using a dynamic voltage restorer (DVR) controlled by synchronous reference frame (SRF) theory to compensate for balanced and unbalanced voltage sags and swells in a distribution system. The DVR injects voltage to maintain the load voltage at a constant level during disturbances. It is modeled and simulated in MATLAB/Simulink. Simulation results demonstrate the DVR successfully compensates for various balanced disturbances including single sag/swell events and multiple sag/swell occurrences. The DVR provides compensation by injecting the appropriate compensating voltage as determined by the SRF control scheme.
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Compensation of Balanced and Unbalanced Voltage Disturbance using SRF Controlled DVR