Renewable energy power plant fast frequency response
AssigneeVestas Wind Systems A/S
InventorsRicardo Manuel Teixeira Gomes, Ines Pereira Barreira
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Abstract
Aspects of the present invention relate to a method of controlling a renewable energy power plant connected to a power network. The renewable energy power plant comprises one or more renewable energy generators having an active power reserve for supplying additional active power to the power network and an energy storage system having an active power store. In response to detecting a frequency event on the power network a power sequence is implemented to manage the additional active power contributions from the energy storage system and the one or more renewable energy generators to satisfy the active power request.
Claims19
A method of controlling a renewable energy power plant connected to a power network, the renewable energy power plant comprising one or more renewable energy generators having an active power reserve for supplying additional active power to the power network and an energy storage system having an active power store, the method comprising, in response to detecting a frequency event on the power network:
- determining an active power request for the renewable energy power plant based on the frequency event;
- and
- implementing a power sequence to manage the additional active power from the energy storage system and the one or more renewable energy generators to satisfy the active power request, the power sequence comprising:
- initiating a first power stage in response to detecting the frequency event, wherein the active power contribution from the energy storage system is controlled during the first power stage by:
- determining an initial power shortage between the active power request and the active power output from the one or more renewable energy generators;
- determining a first active power set point for the energy storage system based on the initial power shortage,
- dispatching the first active power set point to the energy storage system to cause the energy storage system to increase the active power output to the power network from the active power store;
- and
- detecting when the active power output from the energy storage system is equal to the first active power set point;
- and
- initiating a second power stage once the active power output from the energy storage system is equal to the first active power set point, wherein the active power contribution from the energy storage system is controlled during the second power stage by:
- determining a subsequent power shortage between the active power request and the active power output from the one or more renewable energy generators;
- and
- determining and dispatching a second active power set point for the energy storage system based on the subsequent power shortage.
A power plant controller, comprising:
- at least one processor programmed with code which when executed is configured to perform operation for controlling a renewable energy power plant connected to a power network, the renewable energy power plant comprising one or more renewable energy generators having an active power reserve for supplying additional active power to the power network and an energy storage system having an active power store, the operation comprising, in response to detecting a frequency event on the power network:
- determining an active power request for the renewable energy power plant based on the frequency event;
- and
- implementing a power sequence to manage the additional active power from the energy storage system and the one or more renewable energy generators to satisfy the active power request, the power sequence comprising:
- initiating a first power stage in response to detecting the frequency event, wherein the active power contribution from the energy storage system is controlled during the first power stage by:
- determining an initial power shortage between the active power request and the active power output from the one or more renewable energy generators;
- determining a first active power set point for the energy storage system based on the initial power shortage;
- dispatching the first active power set point to the energy storage system to cause the energy storage system to increase the active power output to the power network from the active power store;
- and
- detecting when the active power output from the energy storage system is equal to the first active power set point;
- and
- initiating a second power stage once the active power output from the energy storage system is equal to the first active power set point, wherein the active power contribution from the energy storage system is controlled during the second power stage by:
- determining a subsequent power shortage between the active power request and the active power output from the one or more renewable energy generators;
- and
- determining and dispatching a second active power set point for the energy storage system based on the subsequent power shortage.
Dependencies are inferred from the claim text.