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A system and method for identifying the likelihood of a tower strike in a wind turbine

A technology of wind turbines and rotor blades, applied in the control of wind turbines, monitoring of wind turbines, wind turbines, etc., can solve problems such as damage to the system, high cost of failure, difficulty in repairing or replacing the system, etc., and achieve a small safety margin Effect

Active Publication Date: 2013-08-21
VESTAS WIND SYST AS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Wind turbines are often erected in harsh, inaccessible environments where they are exposed to rain, dust, and icing, which can damage the system
[0006] Repairing or replacing a system can be difficult and time consuming
If a wind turbine has to be shut down until the system is repaired, failure can be costly

Method used

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  • A system and method for identifying the likelihood of a tower strike in a wind turbine
  • A system and method for identifying the likelihood of a tower strike in a wind turbine

Examples

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Embodiment Construction

[0025] figure 1 The wind turbine basically comprises a nacelle 3 which is mounted for rotation on a tower 2 . A rotor 4 comprising a plurality of rotor blades 5 and a hub 6 is mounted to the nacelle. A generator (not shown) is accommodated in the nacelle 3 and has a rotor shaft extending from the nacelle to the front, which is turned by rotation of the rotor blades 5 to generate electric power.

[0026] figure 2 A schematic view of a system embodying the invention for identifying the possibility of a wind turbine rotor blade 5 striking a tower 2 is shown. The system comprises means 7 for sensing the curvature of the wind turbine rotor blade 5 and means 8 for sensing the curvature of the tower 2 . In this example, the wind turbine 1 comprises a plurality of rotor blades 5 , preferably a plurality of devices 7 are provided which each sense the curvature of one rotor blade 5 .

[0027] Various ways of sensing the curvature of the wind turbine rotor blades 5 and tower 2 are k...

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PUM

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Abstract

A system for identifying the likelihood of a wind turbine rotor blade striking a wind turbine tower comprises a device for sensing bending of a wind turbine rotor blade and a device for sensing bending of a wind turbine tower. In a preferred embodiment Long Period Grating (LPG) sensors are used to measure bending of the tower. Preferably a plurality of LPG sensors is provided along the length of the blade. In one embodiment at least one of the LPG sensors comprises two sensing elements arranged to sense in perpendicular directions. In another embodiment a plurality of LPG sensors are provided each on different sides of the wind turbine tower. A processor uses the sensed blade and tower bending to determine whether the distance between the blade and the tower will be below a predetermined minimum value. If the distance is determined to be below the predetermined minimum value a controller may be used to adjust a wind turbine variable to reduce loading on the blade and thereby reduce the likelihood of a tower strike.

Description

technical field [0001] The present invention relates to a wind turbine and in particular to a system and method for identifying the likelihood of a tower strike. Background technique [0002] The danger of a wind turbine rotor blade striking a wind turbine tower, commonly referred to as tower strike, has long been of great concern in the wind turbine industry. As rotor blades increase in length and become more flexible, the risk of tower strikes increases. Current wind turbine rotor blades can extend over 60 meters. Tower strikes can lead to severe damage or even destruction of the wind turbine rotor. [0003] Many existing systems attempt to identify the possibility of a tower strike so that if a tower strike is likely, evasive action can be taken to avoid the threat, such as by adjusting the pitch of the blades to reduce the load on the blades and thereby Reduce the amount of blade deflection or camber. In extreme cases, wind turbines can be shut down until the threat ...

Claims

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Application Information

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IPC IPC(8): F03D7/02F03D11/00
CPCF03D7/0288F05B2270/17F05B2270/33F05B2270/804F05B2270/808Y02E10/728F05B2240/912F05B2270/821F03D17/00Y02E10/72F03D1/0675F03D7/0224
Inventor I·S·奥勒森L·格拉韦德
Owner VESTAS WIND SYST AS
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