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

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...

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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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