Wind turbine generator variable pitch bearing monitoring method and apparatus

Abstract

The invention discloses a wind turbine generator variable pitch bearing monitoring method and apparatus. The method includes the following steps: obtaining multiple axial displacements and multiple radial displacements corresponding to multiple positions in an inner ring of a variable pitch bearing at present, and finding the maximum axial displacement XO' and the maximum radial displacement YO'; and comparing the maximum axial displacement XO' and the maximum radial displacement YO' with the preset maximum axial displacement benchmark value Xmax and the preset maximum radial displacement benchmark value Ymax respectively, and outputting a variable pitch adjusting signal and / or an alarm signal if XO'>Xmax and / or YO'>Ymax. The wind turbine generator variable pitch bearing monitoring method and apparatus can prevent in advance, alarm in time and avoid losses by effectively monitoring displacements of the inner ring of the variable pitch bearing of a wind turbine generator.

Description

Technical field [0001] The invention relates to the technical field of wind power generators, in particular to a method and device for monitoring a variable pitch bearing of a wind turbine. Background technique [0002] The pitch bearing of a wind turbine is an indispensable main component of a wind turbine. It is a part that connects the blade and the hub. It has the function of bearing blade load and blade pitch. Since most of the current pitch bearings of wind turbines are internally toothed double-row four-point contact ball bearings with the same diameter, they have a large load and a long service life, so they have high requirements for lubrication and sealing, processing accuracy, and material mechanical properties. The load must be within the allowable range of material strength during use. However, in actual use, the wind load is changeable, and it is difficult to completely eliminate the excessive load. Excessive load can easily cause excessive displacement and deforma...

AI Technical Summary

Problems solved by technology

However, in actual use, wind conditions and loads are variable, and it is difficult to completely eliminate the situation of excessive loads. Excessive loads will easily cause excessive displacement and deformation of the bearing inner ring, and accelerate the wear and tear of the bearing inner and outer rings, ball raceways and sealing rings. Serious accidents that caused the inner and outer rings of the bearing to break and cause the blade to fall

[0003] Once the wind turbine pitch bearing fails and is damaged, the wind turbine pitch bearing and blades must be hoisted to the ground for replacement, which is expensive and troublesome to replace, seriously affecting the power generation of the wind turbine and causing major losses

In order to avoid bearing wear and failure in time, effective monitoring systems and methods are needed, but at present in this field in the industry, only when the bearing is severely worn to a certain extent will there be a monitoring alarm. Therefore, it is urgent to develop a method that can prevent in advance. Timely early warning and preventive measures of real-time monitoring, so as to avoid serious wear of bearings, prolong the service life of bearings and prevent major losses

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