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Wind turbine generator independent variable pitch control optimization method and system based on laser radar

An independent pitch and laser radar technology, applied in the direction of engine control parameters, wind engine control, wind power generation, etc., to achieve the effect of reducing unit load, reducing unit cost, and reducing frequent actions

Active Publication Date: 2020-12-04
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

Method used

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  • Wind turbine generator independent variable pitch control optimization method and system based on laser radar
  • Wind turbine generator independent variable pitch control optimization method and system based on laser radar
  • Wind turbine generator independent variable pitch control optimization method and system based on laser radar

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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 values ​​of the three blade center points are determined by the wind shear formula;

[0041] Calculate the fatigue load value under different wind shear exponents to 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 coefficient of e...

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: determine the height of the center point of each blade by the azimuth angle of the wind rotor, and then determine the wind speed values ​​of the three blade center points by the wind shear formula;

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

[0077] The pitch control module is configured to: start the independent pitch contro...

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 values ​​of the three blade center points are determined by the wind shear formula;

[0083] Calculate the fatigue load value under different wind shear exponents to determine the critical wind shear exponent;

[0084] When the real wind shear index...

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Abstract

The invention provides a wind turbine generator independent variable pitch control optimization method and system based on a laser radar. The method comprises the following steps that numerical fitting is carried out on wind speed and height data, measured by the laser radar, in front of a wind turbine generator to obtain a real wind shear index and a real wind shear formula; the height of the central point of each blade is determined according to the azimuth angle of a wind wheel, and the wind speed values of the central points of three blades are determined according to the wind shear formula; fatigue load values are calculated under different wind shear indexes, and a critical wind shear index is determined; when the real wind shear index meets the starting condition set by the independent variable pitch control, the independent variable pitch control is started, the pitch angle adjustment coefficient of each blade is determined according to the wind speed values of the center points of the three blades, and three blade pitch angle set values under the independent variable pitch control mode are obtained; and otherwise, unified variable pitch control is performed. According to the method, fatigue load caused by unbalanced impeller thrust can be remarkably reduced, and the problem that the service life of parts such as a variable pitch drive and a variable pitch bearing is shortened due to the fact that variable pitch is too frequent can also be relieved.

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 Applications(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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