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Integration of renewable energy resources with the electric grid is necessaryfor a sustainable energy future. However, increased penetration of inverterbased resources (IBRs) reduce grid inertia, which might then compromise powersystem reliability. Therefore, power utilities are often interested inidentifying the maximum IBR penetration limit for their system. The proposedresearch presents a methodology to identify the IBR penetration thresholdbeyond which voltage, frequency, and tie-line limits will be exceeded. Thesensitivity of the IBR penetration threshold to momentary cessation due to lowvoltages, transmission versus distribution connected solar generation, andstalling of induction motors are also analyzed. Dynamic simulation studiesconducted on a 24,000-bus model of the Western Interconnection (WI) demonstratethe practicality of the proposed approach.

Identification of Utility-Scale Renewable Energy Penetration Threshold in a Dynamic Setting