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US 2004/0105751 A1Published application
Azimuthal control of a wind-energy turbine during a storm
OwnerAloys Wobbeninventor
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OwnerAloys Wobbeninventor
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The present invention concerns a method of controlling a wind power installation at very high wind speeds, in which there is predetermined a first wind speed at which the rotor blades of the wind power installation are put into a first predetermined setting. The object of the present invention is therefore to provide a method of controlling a wind power installation and a wind power installation for carrying out that method, which in an extreme wind situation are in a position to reduce as far as possible mechanical loadings on the wind power installation, which occur due to that extreme wind. A method of controlling a wind power installation comprising a machine housing and a rotor with at least one rotor blade, in which the rotor of the wind power installation is put into a first predetermined position upon the attainment of a first predetermined wind speed (shut-down speed, limit speed) which is greater than 20 m/s and the machine housing (12) is put into a predetermined azimuth position upon the attainment of a second predetermined wind speed which is markedly higher than the first predetermined wind speed.
A method of controlling a wind power installation comprising a machine housing and a rotor with at least one rotor blade, in which the rotor blades of the wind power installation are put into a first predetermined position upon the attainment of a first predetermined wind speed (shut-down speed, limit speed) which is greater than 20 m/s and the machine housing (12) is put into a predetermined azimuth position upon the attainment of a second predetermined wind speed which is markedly higher than the first predetermined wind speed.
A method according to one of the preceding claims characterised in that the loads acting on the rotor blades are detected at the rotor blades (14) by means of load detection means.
A method according to one of the preceding claims characterised in that the twisting of cables in the machine housing (12) is taken into account when establishing the direction of movement for the machine housing (12) to the new azimuth position.
A method according to one of the preceding claims characterised in that, particularly in the case of rapidly changing wind directions, a mean wind direction is ascertained, and that said mean wind direction is taken into account when establishing the direction of movement of the machine housing (12).
A method according to one of the preceding claims characterised in that in the case of a plurality of parameters which influence the direction of movement of the machine housing (12), weighting of the parameters is effected.
A method of controlling a wind power installation according to one of the preceding claims characterised in that upon attainment of the second predetermined wind speed the machine housing is moved into the leeward position and the rotor blades are in the feathered position.
A method according to one of the preceding claims characterised in that the azimuth brake is released upon the attainment of a speed above the first speed, preferably upon the attainment of the second wind speed.
A method according to one of the preceding claims characterised in that the rotor brake is released.
A wind power installation, in particular for carrying out the method according to one of the preceding claims, comprising an azimuth drive and a rotor with at least one individually adjustable rotor blade, characterised by a control apparatus which detects the wind speed and in dependence on the wind speed with the rotor stationary alters the angle of attack of the rotor blades (14) and/or the azimuth position of the machine housing (12).
Dependencies are inferred from the claim text.