A static stiffness circle analysis method for wind turbine towers

Abstract

The invention provides a wind turbine generator tower static stiffness circle analysis method. The method comprises the steps that 1) a biaxial dynamic inclination sensor is installed at the top and bottom of a tower respectively after the installation of the wind turbine generator tower; 2) the wind turbine generator is controlled to carry out one yaw rotation around the top of the tower; data fitting is carried out on data acquired by two biaxial dynamic inclination sensors; each biaxial dynamic inclination sensor fits out an initial reference static stiffness circle to acquire the center and radius of each initial reference static stiffness circle; two sets of fitting data are acquired, namely the center 01, the radius R1 and the center 02 and the radius R2; 3) at the moment, the vector difference between the center 01 and the center 02 is the coaxiality and the perpendicularity of the installed tower; and 4) when maintenance or acceptance is carried out, the wind turbine generator is controlled to carry out one yaw rotation around the top of the tower, and data fitting is carried out on inclination data acquired by two biaxial dynamic inclination sensors.

Description

technical field [0001] The invention relates to the field of wind power towers, in particular to a static stiffness circle analysis method for wind power towers. Background technique [0002] The tower of the wind turbine is the load-bearing part of the wind turbine. It mainly plays a supporting role in the wind turbine and absorbs the vibration of the turbine. The tower is subjected to complex and variable loads such as thrust, bending moment, and torque load, which makes the tower shake and twist to a certain extent during the operation of the wind turbine; in addition, the tower will also be subject to material changes, zero Influenced by factors such as component failure and foundation settlement, the tilt occurred. Excessive tilt deformation of the tower will affect the normal operation of the wind turbine, and serious accidents will also occur. Therefore, it is necessary to conduct real-time detection of the foundation settlement of the wind turbine and the safety of ...

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Problems solved by technology

Excessive tilt deformation of the tower will affect the normal operation of the wind turbine, and serious accidents will also occur. Therefore, it is necessary to conduct real-time detection of the foundation settlement of the wind turbine and the safety of the tower, and how to use the obtained tower tilt data to There has never been a good solution to evaluate whether the tower structure is safe and healthy

[0003] At present, a fixed inclination rate (an empirical value, derived from the standard) is used as an alarm for tower inclination. The height of the fan tower of each manufacturer's model and the thickness of the inner wall of the tower are different, resulting in the rigidity of various types of towers. Not the same, using a fixed slope rate as a criterion for judging different types of towers, cannot achieve accurate alarms

At present, it is impossible to know the inclination rate of the initial installation of the tower, the actual stiffness characteristics of the tower structure, whether the flange bolt connection of the tower is loose, whether the tower structure is damaged, etc.

[0004] At present, there is no method that can detect the safety of the wind turbine tower structure at static time (that is, when it is overhauled or when it is accepted after installation)

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