Control method and apparatus
AssigneeVestas Wind Systems A/S
InventorJorge Martinez Garcia
Life of this patent
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Abstract
A method and a controller for controlling a wind power generation system is disclosed. The system is connected to a grid at a point of connection, and is devised to feed reactive power to the grid in order to improve grid stability. A Q-V characteristic is determined for the grid at the point of connection as well as a nose point for the Q-V characteristic. A minimum reactive current, IQmin, which is safe from the nose point, is determined, and the feeding of reactive power is controlled such that the reactive current is kept higher than the minimum reactive current. This ensures that the reactive current does not make the Q-V characteristic reverse, and thereby the stability of the system is improved.
Claims9
A method for controlling a wind power generation system connected to a grid at a point of connection, wherein the system is devised to feed reactive power to the grid, comprising:
- determining a Q-V characteristic for the grid at the point of connection by injecting a disturbance at the point of connection;
- and
- controlling the feeding of reactive power based on the Q-V characteristic.
A controller for controlling a wind power generation system connected to a grid at a point of connection, wherein the system is devised to feed reactive power to the grid, comprising:
- a power regulator for injecting a disturbance at the point of connection,
- a Q-V characteristic detector for determining the Q-V characteristic for the grid at the point of connection;
- and
- a controller controlling the feeding of reactive power based on the Q-V characteristic.
Dependencies are inferred from the claim text.