SPLTRAK Abstract Submission
Fault Analysis and Relay Assessment on a Substation System with High Penetration of PV Generation
Biqi Wang1, Genesis Alvarez2, Micah Till2, Kevin Jones2, R. Matthew Gardner2
1Virginia Tech, Blacksburg, VA, United States
/2Dominion Energy, Richmond, VA, United States

With distribution power systems’ dramatic transition from centralized generation to distributed generation (DG), system fault responses, especially the fault current profile, will experience some major changes. These changes will likely have a negative impact on the system relay as well as increase the complexity of protection schemes design. This paper, based on a Dominion Energy virtual substation system with a high solar energy penetration level, studies both the photovoltaic (PV) inverter fault responses and the distribution system fault-current profile under various fault scenarios. These include analyzing three-phase and single-phase faults under different fault severity and at different locations. The corresponding performance of an overcurrent protective relay in the substation system were also assessed. A hardware-in-the-loop (HIL) testbed was implemented, with an actual SEL-451 relay interfacing the real-time simulation in the RTDS platform. The HIL simulation results validated the fault analysis and protective relay schemes.