A method and system for monitoring the lubrication state of a wind turbine generator bearing

Abstract

The invention discloses a method and system for monitoring the bearing lubrication state of a wind turbine generator. The method comprises the following steps of: collecting vibration data of a generator bearing and performing Fourier transform on the vibration data of the generator bearing analyzing the frequency spectrum; selecting the frequency spectrum of 2000-3000Hz, segmenting the frequencyin the frequency spectrum according to a preset interval value, calculating the average values of the frequency value and the frequency amplitude value in each frequency spectrum section, selecting out the minimum average frequency amplitude value, and dividing each average frequency amplitude value by the minimum average frequency amplitude value to obtain a group of new data, taking the new dataas frequency numbers, wherein the average frequency values corresponding to the new data are taken as an individuals in the sample; carrying out normal distribution analysis on the frequency numbersand the average frequency values to obtain a mu value and a sigma value, comparing the sigma value with a sigma preset value, and judging whether the bearing lubrication state is abnormal or not. Theinvention also discloses a system for monitoring the bearing lubrication state. By using the combination method of spectrum analysis and mathematical statistics, according to the vibration characteristics of the dry friction of the bearing, the method achieves the effective monitoring of the lubricating state of the bearing of the generator, prolongs the service life of the bearing, and has practicability and economy.

Description

technical field [0001] The invention relates to the technical field of wind power, in particular to a method and system for monitoring the lubrication state of a bearing of a wind turbine generator. Background technique [0002] In wind turbines, the generator has a high operating speed and rapid load changes, and the bearings of the generator support the rotor to transmit the load, which is the most prone to failure component in the wind turbine. Poor lubrication of generator bearings will lead to dry friction of generator bearings, which will cause damage to the structure and internal components of the bearings, and in serious cases will directly cause bearing failure or even damage the entire generator. [0003] In order to improve the lubrication status of the generator bearings, the current generators are basically equipped with an automatic lubrication system as standard to avoid premature damage to the bearings due to lack of lubrication. However, from the point of v...

AI Technical Summary

Problems solved by technology

However, the existing methods still need to be improved in terms of economy and simplicity, and there is no specific method for monitoring the lubrication state of bearings.

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