Method and device for judging abnormal vibration of wind turbine

Abstract

The present invention relates to a method and device for judging the abnormal vibration of a wind turbine. The method includes: collecting the rotational speed and vibration data of the wind turbine; dividing the rotational speed into K segments with step1 as the step length, and calculating the maximum vibration acceleration AX_k of each segment , AY_k and their corresponding speeds GSX_k, GSY_k; divide the speed into N segments with step2 as the step size, and use the curve interpolation method to find the interpolation acceleration sequences AX_n and AY_n corresponding to the speed sequence GS_n; find the extreme value acceleration sequences AX_n_max and AX_n_n of AX_n and AY_n AY_n_max, and its corresponding speed sequences GS_n_X and GS_n_Y; judge whether there is abnormal vibration according to the number of extreme accelerations in each speed range, the corresponding vibration amplitude and the degree of aggregation. The invention can find early hidden dangers of wind turbine failures early, and provides judgment basis for the maintenance and replacement of key components.

Description

technical field [0001] The invention relates to the field of vibration protection of wind turbines, in particular to a method and device for judging abnormal vibration of wind turbines. Background technique [0002] With the continuous development and improvement of wind turbine technology, the traditional fault passive processing mode in the past has changed to the active early warning service mode, and the active early warning service is not only satisfied with the increase or decrease of the wind turbine monitoring state quantity as the early warning parameter , but towards the direction of comprehensive analysis and early warning based on the distribution of monitoring state quantities, changing trends, and the operating state of wind turbines. [0003] For megawatt-scale high-power direct-drive permanent magnet wind turbines, the main components such as blades, generators, towers, etc. have their own mechanical vibration modes. Vibration is an important manifestation o...

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Problems solved by technology

[0005] The above-mentioned existing abnormal vibration protection method for wind turbines can provide users with a control scheme for protection in the case of abnormal vibrations of wind turbines, but it is found to have some shortcomings in actual application and cannot achieve good performance. The effect, its disadvantages can be summarized as follows:

[0006] 1. The existing vibration protection sets a single vibration alarm threshold for wind turbines, which does not distinguish the operating status and operating power range of the wind turbines. Early failure symptoms of core components cannot be effectively identified and found, often causing wind turbines to In the state of "sub-healthy operation" for a long time, it is easy to cause irreversible damage to wind turbines over time

[0007] 2. The existing vibration protection mechanism can only shut down when the vibration increases to a certain level, wait for personnel to repair and reset and restart, and there is no targeted control strategy to reduce the downtime

[0008] It can be seen that the above-mentioned existing method for protecting abnormal vibration of wind turbines obviously still has inconvenience and defects in method and use, and needs to be further improved urgently.

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