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Wind turbine with blade pitch control to compensate for wind shear and wind misalignment

A wind turbine and pitch technology, which is applied to wind turbines, wind turbines, and wind turbine test runs that are consistent with the wind direction, and can solve problems such as slow wind shear.

Inactive Publication Date: 2009-09-02
CLIPPER WINDPOWER INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] Although wind shear varies instantaneously due to turbulence, wind shear is a substantially deterministic disturbance with a slowly varying mean component

Method used

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  • Wind turbine with blade pitch control to compensate for wind shear and wind misalignment
  • Wind turbine with blade pitch control to compensate for wind shear and wind misalignment
  • Wind turbine with blade pitch control to compensate for wind shear and wind misalignment

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specific Embodiment approach

[0043] like figure 1 By way of example, vertical wind shear is the change in wind speed with height above the ground. Among other effects, vertical wind shear is caused by friction with the ground surface which is altitude dependent. The higher the altitude from the ground, the less the effect of surface friction and the higher the wind speed. This phenomenon is usually modeled with a power law function:

[0044] windSpeed∝h α

[0045] Here h is the height above the ground and α is the power exponent, typically 0.14. Actual power exponents vary with local wind conditions and terrain type.

[0046] Because vertical wind shear causes wind speed to vary with altitude, the turbine blades will experience different wind speeds as they rotate around the turbine hub. Periodic changes in wind speed cause periodic changes in the force acting on the blades, causing the blades to flex back and forth and lead to fatigue failure. According to the above formula, the wind speed at heig...

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PUM

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Abstract

A wind turbine rotor load control. The pitch of the blades is controlled in a conventional manner by a command component, a rotor blade pitch command signal. A storage contains stored values of a set of moments for various wind speeds. A moment sensor provides a moment signal output. An instantaneous wind speed indicator provides an instantaneous wind speed value output. A conversion logic connected to the moment signal and to the instantaneous wind speed value, provides a calculated pitch modulation command. Combining logic connected to the calculated blade pitch modulation command and to the collective pitch command, provides a combined blade pitch command, which includes compensation for instantaneous moment deviations of the wind turbine.

Description

technical field [0001] The present invention relates to fluid flow turbines, such as wind turbines, and more particularly, to an apparatus and method for compensating for wind shear and wind misalignment. Background technique [0002] The development of practical wind power generation systems creates problems that are unique and not encountered during conventional power generation system development. The natural variability of wind power affects the nature and quality of the electricity generated. The relationship between the speed of the turbine blade tips and the wind speed affects the maximum energy that can be extracted from the wind. These issues, along with mechanical fatigue due to wind variability, have a significant impact on the cost of wind power generation. [0003] In the past, wind turbines operated at a constant speed. The torque generated by the blades and main shaft determines the power output of such a wind turbine. Such wind turbines are typically cont...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F03D7/02F03D7/04F03D7/00
CPCY02E10/723F03D1/008F03D7/044F05B2270/1016F05B2270/20F03D7/0224F05B2260/821F03D7/024Y02E10/721F03D7/0296F03D13/35Y02E10/72F03D7/02F03D7/04F03D1/06
Inventor K·C·威尔森W·埃德曼T·J·麦库伊
Owner CLIPPER WINDPOWER INC
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