Method and system for monitoring vibration of wind driven generator

Abstract

The present invention provides a method and system for monitoring vibrations in a wind turbine generator, and in the method a rule base for the range of vibration characteristic values is established on the basis of a large quantity of historical data by a data mining method based on a rough set, then the range of vibration characteristic values is predicted (S22) from the real-time operation data of the wind turbine generator according to the rules extracted from the rule base, the threshold of the vibration characteristic values is calculated S24), and finally a judgment for a false alarm is made by comparing the real-time data of the wind turbine generator' s operation characteristic values with the above-mentioned threshold of the vibration characteristic values (S26).

Description

technical field [0001] The invention relates to a vibration monitoring method and system, in particular to a vibration monitoring method and system for wind power generators. Background technique [0002] The condition monitoring and fault diagnosis of wind turbine generators (WTG) usually focus on the transmission system. The transmission system includes the main shaft, main gearbox, generator, etc. These components must be installed through corresponding bearings. The failure of these mechanical rotating parts is mainly Caused by insufficient lubrication, contamination, overloading or inherent defects. Vibration signals obtained from the transmission system are useful for determining operating condition changes in wind turbines. However, in wind turbines, traditional vibration monitoring systems have too many false alarms. The main reason is that, with gas / steam turbines, centrifugal compression Compared with wind turbines, wind turbines and other rotating machines, the b...

AI Technical Summary

Problems solved by technology

Therefore, vibration threshold definitions that do not take into account various possible combinations of operating data will still lead to a high false alarm rate for vibration monitoring

[0005] Every false alarm of the vibration monitoring system will bring high costs: the wind turbine must be stopped, thoroughly inspected, or even dismantled, during which the loss of power generation and detection costs are huge; in addition, if a vibration False alarms from the monitoring system are frequent and the system is quickly shut down or ignored

These factors make it very difficult to accurately monitor the vibration conditions of wind turbines, let alone accurately diagnose faults

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