Method for detecting bearing fault of wind generating set

Abstract

The invention provides a method for detecting a bearing fault of a wind generating set. The method comprises the following steps of: at first, collecting instantaneous angular velocity signals of a rotor of the wind generating set; secondly, judging whether a rotor generates torsional vibration or not according to the fact of determining whether the instantaneous angular velocity signals of the rotor of the wind generating set are equal to a stable angular velocity or not when the rotor works in a stable state; if so, using an envelope demodulation method to analyze the collected instantaneous angular velocity signals of the rotor; if the collected instantaneous angular velocity signals comprise a bearing fault characteristic frequency, expressing that a bearing of the wind generating unit has a fault. According to the method provided by the invention, the torsional vibration signals can be directly measured on a shafting of the wind generating unit, so that the measured transmission path of the torsional vibration signals is short; the signal-to-noise ratio is high; and the fault information of the bearing can be clearly reflected.

Description

technical field [0001] The invention relates to the technical field of fault detection, in particular to a method for detecting a fault of a bearing of a wind power generating set. Background technique [0002] Bearings are the most important load-bearing and force-transmitting components of wind turbines. They are subject to high loads, harsh working environments, and are prone to failure. Moreover, due to the wide distribution of wind turbines and the high position of the nacelle, once the bearing fails, maintenance is extremely difficult, which seriously affects the economic benefits of wind turbines. Therefore, it is very important to inspect the bearings of wind turbines to prolong their service life. At present, vibration detection methods and oil analysis methods are mostly used in wind turbine bearing fault detection. [0003] The existing conventional vibration detection method is to install a vibration velocity or vibration acceleration sensor on the position of ...

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Problems solved by technology

[0006] In order to overcome the problems existing in the prior art that it is difficult to detect the fault information of the bearing, or the bearing state cannot be detected in real time, the present invention proposes a method for detecting the fault of the bearing of the wind power generating set, which is based on the easy-to-measure wind power generation Unit speed signal

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