Fast frequency reserve and inertia requirement
Fast frequency reserve (FFR) is a reserve product that is fully activated in 1-2 seconds. It can help in limiting the rate of change of frequency (ROCOF), and especially, it can be useful in situations with low inertia. How to consider that in Backbone? Should it be included in the ROCOF/inertia constraints (see the figure)? There would be a new set restype_inertia (could be named differently) that would include the reserve category(-ies) that can be used to limit the ROCOF. The figure shows only the use of upward FFR, but maybe there should also be downward FFR for sudden loss of export / big load. Ideas, @CODWYER , @juha_k ?