Real Time Simulation of Dynamic Voltage Restorer (DVR) utilizing RTDS and dSPACE

This paper deals with the simulation of a Dynamic Voltage Restorer (DVR) for compensating electric power grid disturbances, in order to protect sensitive loads. The DVR is composed for power electronics converters (AC-DC and DC-AC converters), a serie transformer and a control system. This control system is capable of detecting the disturbances and compensating them. The complete system (grid model, DVR and sensitive load) was simulated on Real-Time Digital Simulator (RTDS), with Hardware in the Loop (HTL) on dSPACE. In RTDS, the power circuits was modeled, and already on dPSACE, the control logic was implemented. In order to analyze the DVR's dynamic behavior, simulation tests have been performed, inserting disturbances with variable amplitude, characterizing a voltage sag, swell and interruption. And finally, the simulation results show a successful compensation for the disturbances inserted in grid, protecting the load.