Methods of operating a wind turbine, wind turbines and wind parks
AssigneeALSTOM Renewable Technologies
InventorsJosep Prats Mustarós, Marc Guadayol Roig
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Abstract
Methods of operating a variable speed wind turbine as a function of a wind speed, the wind turbine having a rotor with a plurality of blades, a generator having a rated output power, and one or more pitch mechanisms for rotating the blades around their longitudinal axis, and a system for varying a torque of the generator. The methods comprise a sub-nominal zone of operation for wind speeds below a nominal wind speed and a supra-nominal zone of operation for wind speeds at or above the nominal wind speed, wherein at wind speeds at or near the nominal wind speed, the generator is allowed to generate more than its rated output power for a limited period of time. Also disclosed are wind turbines and wind farms adapted to perform these methods.
Claims14
A method of operating a variable speed wind turbine as a function of a wind speed, the wind turbine having
- a rotor with a plurality of blades, a generator having a rated output power, and one or more pitch mechanisms for rotating the blades around their longitudinal axis, and a system for varying a torque of the generator,
- a sub-nominal zone of operation for wind speeds below a nominal wind speed and a supra-nominal zone of operation for wind speeds at or above the nominal wind speed,
- the method comprising:
- at wind speeds at or near the nominal wind speed, allowing the generator to generate an adapted output power that is more than the rated output power for a pre-defined period of time, the adapted output power having a maximum limit;
- and
- wherein the adapted output power limit is variable and determined as a function of temperature of a component of the wind turbine and the pre-defined period of time is set by a time constant before generation of the adapted output power such that the adapted output power decays exponentially substantially zero over an entirety of the pre-defined period of time regardless of temperature change of the component of the wind turbine during the pre-defined period of time.
Dependencies are inferred from the claim text.