Scalable Screening of Grid Strength using Short-circuit Analysis for a Transmission System with High Renewable Penetration

A large volume of renewable resources, such as wind, solar, and battery storage, are expected to join the generation fleet at MISO in a near future. Collectively referred to as inverter-based resources, these resources bring capabilities to operate asynchronously from the system’s operation. Areas with higher penetration of IBRs may become less strongly connected with the rest of the system, making the area prone to sub-synchronous oscillation events. In this paper, methods to detect such areas of weak grid strength are reviewed. Building on the recent efforts from the industry, SCR-based stability analysis is then tested on IEEE 14-bus model under various network topology and IBR penetration levels. Validation of the screening method is shown based on detailed EMT simulation. Insights about the capability and limitation of the proposed inverter participation SCR (IPSCR) is shared.