This paper has described a laboratory-scale DFIG test facility commissioned to investigate the low voltage fault behavior of a DFIG wind turbine generator. In this DFIG test facility, a dc motor driven by a four-quadrant dc drive is used as a prime mover to replicate the torque input from a wind turbine's drive shaft. A mechanical model created in Simulink is executed by the dSpace controller. The IGBT power converter and dc-link capacitors are over-rated to withstand various grid faults. The fault emulator permits a flexible approach to the application of grid faults and also provides an opportunity to mimic the typical grid connection impedance of a wind turbine.