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Optimization method and system for independent pitch control of wind turbine based on lidar

An independent pitch and laser radar technology, applied in engine control parameters, wind engine control, wind power generation, etc., to achieve simple and easy implementation, reduce unit cost, and reduce fatigue load

Active Publication Date: 2021-08-10
CRRC WIND POWER(SHANDONG) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to solve the shortcomings of the existing technology, the present disclosure provides a method and system for optimizing the independent pitch control of wind turbines based on lidar. When the wind turbine runs above the rated wind speed and meets the set conditions, the independent pitch control is turned on. It can significantly reduce the fatigue load caused by the unbalanced thrust of the impeller, and can also alleviate the problem of reduced life of the pitch drive, pitch bearing and other components caused by too frequent pitch changes

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  • Optimization method and system for independent pitch control of wind turbine based on lidar
  • Optimization method and system for independent pitch control of wind turbine based on lidar
  • Optimization method and system for independent pitch control of wind turbine based on lidar

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Embodiment 1

[0038] Such as figure 1 As shown, Embodiment 1 of the present disclosure provides a lidar-based independent pitch control optimization method for wind turbines, including the following steps:

[0039] Obtain the wind speed values ​​measured by the laser radar at the preset distances in front of the wind turbine at multiple heights, and perform numerical fitting on the wind speed and height data to obtain the real wind shear index and wind shear formula;

[0040] The height of the center point of each blade is determined by the azimuth angle of the wind rotor, and then the wind speed value of each center point of the three blades is determined by the wind shear formula;

[0041] Calculate the blade root fatigue load value under different wind shear exponents, and determine the critical wind shear exponent;

[0042] When the real wind shear index is greater than or equal to the critical wind shear index, the independent pitch control is turned on, and the pitch angle adjustment...

Embodiment 2

[0073] Embodiment 2 of the present disclosure provides a lidar-based independent pitch control optimization system for wind turbines, including:

[0074] The real wind shear index acquisition module is configured to: obtain the wind speed values ​​at multiple heights in front of the wind turbine measured by the laser radar, and perform numerical fitting on the wind speed and height data to obtain the real wind shear index and wind shear formula;

[0075] The blade wind speed acquisition module is configured to: respectively determine the height of the center point of each blade by the azimuth angle of the wind rotor, and then determine the wind speed value of each center point of the three blades by the wind shear formula;

[0076] The critical wind shear index acquisition module is configured to: calculate the blade root fatigue load value under different wind shear indices, and determine the critical wind shear index;

[0077] The pitch control module is configured to: star...

Embodiment 3

[0080] Embodiment 3 of the present disclosure provides a computer-readable storage medium, on which a program is stored. When the program is executed by a processor, the lidar-based independent pitch control optimization method for wind turbines as described in Embodiment 1 of the present disclosure is implemented. The steps in , which are:

[0081] Obtain the wind speed values ​​measured by the laser radar at the preset distances in front of the wind turbine at multiple heights, and perform numerical fitting on the wind speed and height data to obtain the real wind shear index and wind shear formula;

[0082] The height of the center point of each blade is determined by the azimuth angle of the wind rotor, and then the wind speed value of each center point of the three blades is determined by the wind shear formula;

[0083] Calculate the blade root fatigue load value under different wind shear exponents, and determine the critical wind shear exponent;

[0084] When the real...

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Abstract

The present disclosure provides a laser radar-based independent pitch control optimization method and system for wind turbines, which performs numerical fitting on the wind speed and height data in front of the wind turbine measured by the laser radar to obtain the real wind shear index and wind shear formula; Determine the height of the center point of each blade by the azimuth angle of the wind rotor, and then determine the wind speed value of each center point of the three blades by the wind shear formula; calculate the fatigue load value of the blade root under different wind shear exponents, and determine the critical wind shear Variable index; when the real wind shear index meets the opening conditions set by the independent pitch control, the independent pitch control is turned on, and the pitch angle adjustment coefficient of each blade is determined according to the wind speed value of each center point of the three blades, and the independent pitch angle adjustment coefficient is obtained. Three blade pitch angle settings in pitch control mode; otherwise, unified pitch control. The disclosure can not only significantly reduce the fatigue load caused by the unbalanced thrust of the impeller, but also alleviate the problem of reduced service life of components such as the pitch drive and the pitch bearing caused by too frequent pitch changes.

Description

technical field [0001] The present disclosure relates to the technical field of wind power control, in particular to a laser radar-based independent pitch control optimization method and system for wind turbines. Background technique [0002] The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art. [0003] With the continuous increase of the unit capacity of wind turbines and the diameter of the wind rotor, the influence of wind shear effect and tower shadow effect on the wind turbine is intensified. The pitch angle can be controlled according to the position of each blade and the wind speed, which can not only ensure the stable power output of the unit, but also effectively reduce the load on the blade root and hub, thereby reducing the overall cost of the unit and improving the reliability of the wind turbine and longevity. [0004] Since the traditional anemometer is installed b...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F03D7/04
CPCF03D7/0224F05B2260/70F05B2270/32Y02E10/72
Inventor 刘翠翠赵磊田家彬关中杰李钢强牛成刘南南刘建爽
Owner CRRC WIND POWER(SHANDONG) CO LTD
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