Power system stability analysis & planning using impedance-based methods

A power system screening method is introduced to quickly estimate the stability and power transfer limits of an IBR-dominant power system, such as the future resource fleet in the Midcontinent Independent System Operator (MISO) footprint. Today's approaches typically use positive-sequence dynamic simulations or electromagnetic transient (EMT) simulations to evaluate the stability limits of IBR-dominant systems; however, these approaches are computationally burdensome and difficult or unmanageable for large power systems. The new approach combines steady-state voltage stability analysis with focused use of detailed EMT simulations using an impedance-based method to capture specific stability characteristics of different resource technologies (traditional synchronous machines as well as inverter-based resources) in a way that is tractable for use in planning studies on large power systems considering many potential scenarios.