Method and system for monitoring vibration of wind driven generator

Abstract

The invention provides a method and a system for monitoring vibration of a wind driven generator. In the method, firstly, based on a large amount of historical data, a vibration characteristic value range rule base is built through a data mining method on the basis of a rough set; secondly, a vibration characteristic value range is predicted by the real-time operating data of the wind driven generator according to the extracted rules in the rule base, and the threshold of the vibration characteristic value is calculated; and finally, the real-time data of the operation characteristic of the wind driven generator and the threshold of the vibration characteristic value are compared so that the judgment of failure warning is made. In the method and the system, different operating data combinations are considered, so that the failure warning rate of monitoring the vibration of the wind driven generator can be greatly reduced; and at the same time, the vibration characteristic value range rule base is represented in a displayable and explainable multiplex rule mode, is easy to understand, and is convenient to automatically or manually maintain.

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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