Wind energy plant

Abstract

The present invention concerns a wind power installation comprising a pylon and a rotor arranged on the pylon and having at least one individually adjustable rotor blade, comprising a device for detecting the wind direction and a device for detecting the azimuthal position. The object of the present invention is to develop a wind power installation of the kind set forth in the opening part of this specification in such a way that the service life of the azimuthal drives is prolonged and/or it is possible to use smaller azimuthal drives which can thus be better handled. A wind power installation comprising a pylon and a rotor arranged on the pylon and having at least one individually adjustable rotor blade, comprising a device for detecting the wind direction and a device for detecting the azimuthal position. characterised by a control of rotor blade adjustment in dependence on a deviation between the ascertained wind direction and the detected azimuthal position.

1 . A wind power installation comprising a pylon and a rotor arranged on the pylon and having at least one individually adjustable rotor blade, comprising a device for detecting the wind direction and a device for detecting the azimuthal position. 
 characterised by a control of rotor blade adjustment in dependence on a deviation between the ascertained wind direction and the detected azimuthal position.    
     
     
         2 . A wind power installation according to  claim 1  characterised by a platform ( 30 ) which floats on or in the water as a carrier for the wind power installation ( 8 ,  10 ,  12 ).  
     
     
         3 . A wind power installation according to  claim 2  characterised by a device for detecting the deflection of the platform ( 30 ) out of the horizontal.  
     
     
         4 . A wind power installation according to  claim 2  or  claim 3  characterised by a device for detecting the deflection of the pylon ( 8 ) of the wind power installation ( 8 ,  10 ,  12 ) out of the vertical.  
     
     
         5 . A wind power installation according to one of the preceding claims characterised by an azimuthal bearing in the form of a plain bearing.  
     
     
         6 . A wind power installation according to one of the preceding claims characterised by a braking device for braking the azimuthal rotary movement.  
     
     
         7 . A wind power installation according to one of the preceding claims characterised in that there is provided an azimuthal drive for adjustment of the azimuthal position of the wind power installation and comprising at least two and preferably four asynchronous motors which during the azimuthal adjustment by control of the rotor blade adjustment are acted upon with no direct current or possibly a very low direct current or which are acted upon with a three-phase current to assist with the azimuthal adjusting movement.  
     
     
         8 . A method of controlling the angle of incidence of a rotor blade of a wind power installation according to one of the preceding claims characterised in that a change in wind direction is ascertained from a difference between the wind direction and the azimuthal position and/or a deflection of the platform ( 30 ) out of the horizontal and/or a deflection of the pylon ( 8 ) out of the vertical and that the magnitude of the change in wind direction and the duration thereof are compared to predeterminable threshold values.  
     
     
         9 . A method according to  claim 8  characterised in that when a first threshold value in respect of the magnitude of the change in wind direction and a predetermined duration are exceeded at least one rotor blade in a predeterminable region of the rotor blade circle is adjusted.  
     
     
         10 . A method according to  claim 8  characterised in that when a second threshold value in respect of the magnitude of the change in wind direction is exceeded at least one rotor blade in a predeterminable region of the rotor blade circle is adjusted and the azimuthal drive is switched on.  
     
     
         11 . A method according to  claim 8  characterised in that when a third threshold value in respect of the magnitude of the change in wind direction is exceeded tracking adjustment is effected only with the azimuthal drive.  
     
     
         12 . A method according to one of the preceding claims characterised in that to assist with the azimuthal adjustment by means of rotor blade adjustment the azimuthal drives are supplied with a corresponding current so that the azimuthal adjustment can be effected more quickly.  
     
     
         13 . A method according to one of the preceding claims characterised in that the motor azimuthal drive is operated during azimuthal adjustment by means of rotor blade adjustment in a braking mode, for example by virtue of the fact that the azimuthal drive is in the form of an asynchronous motor and during azimuthal adjustment by means of rotor blade adjustment is supplied with a direct current, for example a direct current of less than 10% of the nominal current.