Index System for Evaluating the Supporting Capability of the Inverter-based Resource

With the wide installation of inverter-based resources (IBR) in power system, the provision of frequency and voltage support becomes a must-be for these IBRs in order to maintain a stable operation. The grid-forming (GFM) and grid-following-IBRs present different characteristics on the system support. In order to properly evaluate the IBR supporting capability in terms of the frequency and voltage stability, this paper proposes an index system considering the power density and energy density in a multiple time scales. A modified IEEE 39 bus system built in DIGSILENT platform serves to verify the effectiveness of the proposed index system and to prove that the GFM-IBR has better performances than the GFL-IBR from various aspects.