Grid frequency control in an offshore wind farm
AssigneeABB Schweiz AG
InventorsLennart Harnefors, Ioannis Tsoumas
Life of this patent
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Abstract
A method of controlling a wind farm including a plurality of wind turbines installed in an AC subgrid, which is connected via a high-voltage rectifier and a DC line to an energy conversion device, the method including: controlling a power infeed of each wind turbine to maintain a setpoint grid frequency of the subgrid; sensing a grid frequency in the subgrid; determining a reference quantity based on a difference of the sensed grid frequency and the setpoint grid frequency; and controlling the energy conversion device in accordance with the determined reference quantity.
Claims20
A method of controlling a wind farm including a plurality of wind turbines installed in an AC subgrid, which is connected via a high-voltage rectifier and a DC line to an energy conversion device, the method comprising:
- controlling a power infeed of each wind turbine to maintain a setpoint grid frequency (ω1) of the subgrid;
- sensing a grid frequency (ωg) in the subgrid;
- determining a reference quantity based on a difference of the sensed grid frequency and the setpoint grid frequency;
- and
- controlling the energy conversion device in accordance with the determined reference quantity.
A controller for controlling a wind farm including a plurality of wind turbines installed in an AC subgrid, which is connected via a high-voltage rectifier and a DC line to an energy conversion device, the controller configured to:
- control a power infeed of each wind turbine to maintain a setpoint grid frequency (ω1) of the subgrid;
- sense a grid frequency (ωg) in the subgrid;
- determine a reference quantity based on a difference of the sensed grid frequency and the setpoint grid frequency;
- and
- control the energy conversion device in accordance with the determined reference quantity.
A computer program comprising instructions to cause a controller to execute a method, the controller for controlling a wind farm including a plurality of wind turbines installed in an AC subgrid, which is connected via a high-voltage rectifier and a DC line to an energy conversion device, the controller configured to:
- control a power infeed of each wind turbine to maintain a setpoint grid frequency (ω1) of the subgrid;
- sense a grid frequency (ωg) in the subgrid;
- determine a reference quantity based on a difference of the sensed grid frequency and the setpoint grid frequency;
- and
- control the energy conversion device in accordance with the determined reference quantity,
- the method including:
- controlling a power infeed of each wind turbine to maintain a setpoint grid frequency (ω1) of the subgrid;
- sensing a grid frequency (ωg) in the subgrid;
- determining a reference quantity based on a difference of the sensed grid frequency and the setpoint grid frequency;
- and
- controlling the energy conversion device in accordance with the determined reference quantity.
Dependencies are inferred from the claim text.