WIND TURBINE AND WIND TURBINE BLADE
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United States of America Patent
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Issued Date -
Nov 22, 2012
app pub date -
May 16, 2012
filing date -
May 19, 2011
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A method for controlling a two-bladed pitchable swept-blade wind turbine in extreme wind conditions is described, wherein when extreme conditions are detected or forecast for the wind turbine, the wind turbine blades are pitched such that they will stabilise in a substantially horizontal arrangement. The blades can be yawed such that the tip ends of the wind turbine blades point in the same direction towards the surface level, thereby lowering the centre of mass of the rotor assembly of the wind turbine blades and the rotor hub. The lower centre of mass of the assembly results in the stabilisation of the blades in a substantially horizontal position, resulting in a reduced surface area of the blades exposed to the extreme wind forces. This reduced surface area provides for a reduction in the extreme loads which may be experienced by the wind turbine in such extreme wind conditions.
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