Control device for damping grid oscillations
AssigneeVestas Wind Systems A/S
InventorsJorge Martinez Garcia, Florin Lungeanu
Life of this patent
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Abstract
The invention relates to a method for damping grid oscillations. The oscillations may be damped by controlling e.g. wind turbine generators to inject power to the grid in anti-phase with the grid oscillations. Instead of controlling one or more wind turbine generators to generate the same anti-phase power signal, a plurality of wind turbine generators are controlled so that each of them only generates a part of the anti-phase power signal, but so that all of the wind turbine generators in combination generates the entire anti-phase power signal.
Claims14
A control device for damping electrical grid oscillations in a utility grid, where the control device comprises
- an input for receiving electrical parameters relating to the utility grid or for receiving a main damping reference signal determined for damping the grid oscillations,
- a processor for determining at least first and second reference signals from the input for controlling power generation of first and second power generator units connected to the utility grid for delivering power to the utility grid, where
- the first and second reference signals are determined so that the power delivered to the grid by the first and second power generator units in combination enables damping of the grid oscillations, and where
- the first and second reference signals each comprises an active part for causing a control effect on the respective first and second power generator units and, successively to the active part, a passive part which does not cause a control effect, where the active parts of the first and second reference signals are separated in time.
A system, comprising:
- a wind turbine generator, comprising:
- a control device communicatively coupled to the wind turbine generator, the control device for damping electrical grid oscillations in a utility grid, the control device comprising:
- an input for receiving electrical parameters relating to the utility grid or for receiving a main damping reference signal determined for damping the grid oscillations;
- and
- a processor for determining at least first and second reference signals from the input for controlling power generation of first and second power generator units connected to the utility grid for delivering power to the utility grid,
- where the first and second reference signals are determined so that the power delivered to the grid by the first and second power generator units in combination enables damping of the grid oscillations;
- and where the first and second reference signals each comprises an active part for causing a control effect on the respective first and second power generator units-and, successively to the active part, a passive part which does not cause a control effect, where the active parts of the first and second reference signals are separated in time.
A method for damping electrical grid oscillations in a utility grid, where the method comprises,
- receiving electrical parameters relating to the utility grid or for receiving a main damping reference signal determined for damping the grid oscillations,
- determining at least first and second reference signals from the input for controlling power generation of first and second power generator units connected to the utility grid for delivering power to the utility grid, where
- the first and second reference signals are determined so that the power delivered to the grid by the first and second power generator units in combination enables damping of the grid oscillations, and where
- the first and second reference signals each comprises an active part for causing a control effect on the respective first and second power generators and, successively to the active part, a passive part which does not cause a control effect, where the active parts of the first and second reference signals are separated in time, and
- applying the reference signals to the first and second power generator units for damping the electrical grid oscillations.
Dependencies are inferred from the claim text.