Patent ID: 8610299

Claim:
A wind turbine control device applied to a wind turbine generator system in which output powers of a plurality of wind turbines are supplied to a utility grid through a common interconnection point, the wind turbine control device being provided in each of the plurality of wind turbines, the wind turbine control device comprising: a setting section for generating first command information used to generate a first output power command for reducing fluctuation of a frequency of an output power of one wind turbine when a grid disturbance occurs, to thereby reduce fluctuation of a grid frequency at the interconnection point; a processing section for generating second command information used to generate a second output power command for reducing fluctuation of the frequency of the output power of the one wind turbine when the grid disturbance occurs; a selection section for selecting the first command information or the second command information when the grid disturbance occurs, the second command information being selected when the fluctuation of the grid frequency at the interconnection point exceeds a predetermined first threshold and the first command information being selected when the fluctuation of the grid frequency at the interconnection point becomes smaller than a second threshold, the second threshold being equal to or smaller than the first threshold, for a predetermined period of time or when a cycle of the fluctuation of the grid frequency at the interconnection point lasts for a predetermined third threshold; and a command generating section for generating the first output power command or the second output power command for controlling the output power of the one wind turbine based on the first command information or the second command information selected by the selection section.