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Method for monitoring inherent frequency of wind generation set tower

A technology for wind turbines and natural frequency, which is applied to the measurement of resonance frequency, testing of mechanical components, testing of machine/structural components, etc. It can solve the problems of affecting the service life of the unit and the difference in the effect of adding resistance, so as to avoid the occurrence of serious failures , Guarantee the effect of safe and effective operation

Active Publication Date: 2017-09-22
SHANGHAI ELECTRIC WIND POWER GRP CO LTD
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Problems solved by technology

At present, most manufacturers use the natural frequency of the tower calculated by the whole machine model as input, but due to the difference in the manufacturing process of the tower and the site foundation, the natural frequency of the tower of the actual unit is different from the calculated value, resulting in the addition of resistance between the actual application and the theoretical calculation. The effect is different, affecting the service life of the unit

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  • Method for monitoring inherent frequency of wind generation set tower

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Embodiment Construction

[0018] as the picture shows, figure 1 It is a system block diagram of the present invention, a method for monitoring the natural frequency of a wind turbine tower, wherein the instantaneous values ​​of vibration acceleration at two axially symmetrical points in the tower are measured; weighted calculations are performed on the two instantaneous vibration acceleration values, and fast Fourier Transform processing to obtain the corresponding frequency domain signal; perform peak detector detection and filter processing on the frequency domain signal to obtain the instantaneous value of the natural frequency of the tower; compare the instantaneous value with the base value to obtain the difference, if the difference is greater than the threshold, then An alarm is issued to shut down.

[0019] Further, the two vibration acceleration instantaneous values ​​are calculated to obtain the weighted velocity instantaneous value.

[0020] Further, a fast Fourier transform is performed on...

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Abstract

The invention discloses a method for monitoring the inherent frequency of a wind generation set tower. The method comprises the steps that vibrating acceleration instantaneous values of the two points in the tower are measured, wherein the axes of the two points are symmetric; the two vibrating acceleration instantaneous values are subjected to weighted calculation and fast Fourier transformation, and a corresponding frequency domain signal is obtained; the frequency domain signal is detected by a peak detector and filtered, and the instantaneous value of the inherent frequency of the tower is obtained; the instantaneous value is compared with a basic value, a difference value is obtained, if the difference value is larger than a threshold, an alarm is sent out and shut-down is conducted. When the vibrating acceleration signals of the tower is obtained in real time, the instantaneous value and the basic value of the inherent frequency of the tower are obtained through real-time calculation and moving average calculation, the tower failure monitoring effect is achieved, the major failure of the tower is avoided, and safe and effective running of a wind generation set is ensured.

Description

technical field [0001] The invention relates to a method for maintaining a wind power generating set, in particular to a method for monitoring the natural frequency of a tower of a wind generating set. Background technique [0002] With the rapid development of the wind power industry, the capacity of a single wind turbine is increasing, and most manufacturers use the tower resistance method to reduce the tower load. Regardless of passive or active damping, accurate tower natural frequency is required to adjust the damper parameters to achieve a good damping effect. At present, most manufacturers use the natural frequency of the tower calculated by the whole machine model as input, but due to the difference in the manufacturing process of the tower and the site foundation, the natural frequency of the tower of the actual unit is different from the calculated value, resulting in the addition of resistance between the actual application and the theoretical calculation. The ef...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01H13/00G01M13/00
CPCG01H13/00G01M13/00
Inventor 蒋勇赵大文邵时雨楚峥张天明许王建刘帅岳清涛刘瑞博
Owner SHANGHAI ELECTRIC WIND POWER GRP CO LTD
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