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We propose a novel hierarchical frequency and voltage control design formulti-area power system integrated with inverter-based resources (IBRs). Thedesign is based on the idea of prioritizing the use of IBRs over conventionalgenerator-based control in compensating for sudden and unpredicted changes inloads and generations, and thereby mitigate any undesired dynamics in thefrequency or the voltage by exploiting their fast actuation time constants. Anew sequential optimization problem, referred to as Area Prioritized Power Flow(APPF), is formulated to model this prioritization. It is shown that comparedto conventional power flow APPF not only leads to a fairer balance between thedispatch of active and reactive power from the IBRs and the synchronousgenerators, but also limits the impact of any contingency from spreading outbeyond its respective control area, thereby guaranteeing a better collectivedynamic performance of the grid. This improvement, however, comes at the costof adding an extra layer of communication needed for executing APPF in ahierarchical way. Results are validated using simulations of a 9-machine,6-IBR, 33-bus, 3-area power system model, illustrating how APPF can mitigate adisturbance faster and more efficiently by prioritizing the use of localarea-resources.

Hierarchical Frequency and Voltage Control using Prioritized Utilization of Inverter Based Resources