A model-in-the-loop interface to emulate source dynamics in a zonal DC distribution system

Abstract—A model-in-the-loop capability (MIL) has been de-veloped to emulate the dynamics of alternative power sources in a hardware-based dc zonal electrical distribution system. Using this tool, models of the power sources are simulated in real-time and interfaced with hardware components at the voltage and current levels of the power system. Coupling between simulation and hardware is established through a dc/dc power converter using model/wall-clock time synchronization. The MIL capability is illustrated in the emulation of a synchronous machine/converter power source. Results of time-domain and frequency-domain studies are provided to validate the approach. Index Terms—DC distribution testbed, dynamics, hardware-in-the-loop, real-time simulation, stability