Hybrid power plant fast frequency response

A method of controlling a hybrid power plant connected to a power network, the hybrid power plant comprising at least two types of renewable energy generator having an active power reserve for supplying additional active power to the power network, the method comprising, during a frequency event detected on the power network:

• determining, based at least in part, on the frequency event, an additional amount of active power for the hybrid power plant to provide to the power network to provide a frequency response;
• calculating, based on a priority sequence configuration and the active power reserve of the at least two types of renewable energy generator, a contribution from each of the at least two types of renewable energy generator for supplying the additional amount of active power, wherein the priority sequence configuration comprises a sequence in which the at least two types of renewable energy generator should cumulatively provide a maximum-possible contribution to the additional amount;
• and
• generating and dispatching active power requests to the generators for supplying the additional amount according to the calculated contributions,
• wherein at least one type of the at least two types of renewable energy generator is configured to contribute active power from a reserve and using an over-boost mechanism, and wherein the sequence includes an entry for the reserve and an entry for the over-boost, the entry for the reserve being earlier in the sequence than the entry for the over-boost, and wherein the over-boost mechanism is a capability of the at least one type to supply active power above a rated value.