EPRI (Electric Power Research Institute) has published a report of hardware testbed findings. The report is titled "Demonstration of Oscillation Damping Control Using Measurement-Based Transfer Function Model on the CURENT Hardware Testbed." The hardware testbed and the research team are located at CURENT, the Center for Ultra-Wide-Area Transmission Networks, at the University of Tennessee in Knoxville, TN.
Read the report here.