Dynamic voltage restorer (DVR) is a device that can compensate harmonic, voltage sag and voltage swell condition that exists in a three-phase system. It is a quite complex system consisting of transformers, DC link, controllers and IGBT switches. Therefore, as per my knowledge, there is no such "DVR" block in the simulink library browser.
You have to build your own DVR model in SIMULINK using the models for switches, transmission lines, transformers, controllers etc.
Please refer to the below given File-exchange link. It simulates three-Phase Dynamic Voltage Restorer (DVR) using Fuzzy Logic in SIMULINK.
I hope this helps!
