The project team continued with developing a comprehensive framework for the assessment of system needs and the capabilities of all existing resources (including IBRs) to provide services in response to each of the needs. The framework answers the following key questions:
- What individual grid services are necessary to ensure reliable operation of a power system?
- How does the addition of IBRs alter the types and quantities of required grid services?
- How can services from IBRs supplement or replace those traditionally provided by legacy synchronous generators? What new or different services from IBRs could enhance or maintain reliability?
The framework includes analysis dynamic stability issues—such as voltage, angle, and frequency stability—in the context of increasing levels of IBRs. It is being tested on a realistic power system model using actual planning cases from the Southwest Power Pool (SPP) an Independent System Operator in the U.S. Eastern Interconnection. The framework is applicable to any power system, especially those anticipating a high share of renewables, to evaluate system stability in terms of grid strength and voltage and frequency support.
2025 Fall Technical Workshop Tutorial: Power System Needs and Services Operating with High Shares of Inverter-Based Resources