The Need for Grid-Forming Inverters in the Future Power System

[@irfanakhtar72]

In the example you gave for running the grid isolated with wind/pv/bess, you had GFI on batteries. Does this require a certain BESS capacity in relations with PV and Wind capacity to do so. I assume it depends on magnitude of fluctuations and probably this can be modeled. In my project I have 2.2 GWac of Solar, 1.7 GWac of Wind and 400 MW/400 MWHR of battery which of course has Grif Forming Capability?