Specifications include, but are not limited to: 1. Power Hardware in the Loop System (PHIL) with the following components and capabilities. 1a. Six controllable (single-phase) sources (up to 800V, 50A DC, 75A RMS) that can be configured as (i) two three-phase AC sources, or (ii) one three-phase AC source and one DC source with grounded midpoint (see sketches attached to sourcing event). 1b. The controllable sources should be fed from a common bus to enable circulating power through the PHIL interface / Device Under Test (DUT) so that only losses need to be supplied from the utility grid. 1c. The controllable sources should be supplied from a common DC bus to enable circulating power through the PHIL interface / DUT so that only losses need to be supplied from the utility grid. 1d. Power supply/supplies for the single-phase sources as needed to operate the system at the maximum currents defined above. 1e. Voltage / current sensors on every phase and option to either voltage or current control the sources. 1f. Real-time simulators capable of executing detailed simulation models of power grid models (i.e., EMT simulations of AC and DC transmission benchmarks) and common renewable sources (e.g., wind turbines, solar PV) that are interfaced to a device under test through the controllable sources and sensors listed above for power hardware in the loop (PHIL) testing...