Method for monitoring low-frequency vibration of wind power generation set

A technology for wind turbines and low-frequency vibration, which is applied in the control of wind turbines, wind turbines, and wind power generation, etc., can solve the problems of multiple vibration monitoring points for a single unit, increased maintenance workload of technicians, and large data processing workload.

Active Publication Date: 2012-12-19
天津瑞源电气有限公司
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Problems solved by technology

However, due to the large number of wind turbines in the power plant and the large number of vibration monitoring points for a single unit, the workload of data processing is heavy, which greatly increases the maintenance workload of technicians

Method used

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  • Method for monitoring low-frequency vibration of wind power generation set

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Embodiment Construction

[0020] Such as figure 1 As shown,

[0021] The present invention mainly deals with the following low-frequency vibrations:

[0022] Tower vibration: In the low-frequency vibration of wind turbines, tower vibration is an important monitoring object. Generally, the first-order natural frequency of the tower is about 0.3~0.4HZ. It is usually considered as a three-blade wind turbine. The resonance force is the maximum harmonic component of 3 times the rotation speed. Therefore, when the natural frequency of the tower is close to an integer multiple of the rotation frequency within a certain range, a large dynamic stress will be generated, which makes the tower have the nature of resonance. Therefore, it is necessary for the unit to monitor the first-order natural frequency of the tower when the wind turbine is started and connected to the grid;

[0023] Blade vibration: The monitoring of blade vibration is mainly the aerodynamic force, gravity and centrifugal force on the blade, and th...

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Abstract

The invention provides a method for monitoring low-frequency vibration of a wind power generation set. The method includes the following steps of acquiring set vibration signals of the wind power generation set by an acceleration sensor, processing the set vibration signals correspondingly by a filter and a wave detector in a vibration analyzer to acquire various low-frequency vibration monitoring signals, transmitting the monitoring signals to a PLC (programmable logic controller) of a wind power generation set control cabinet, and comparing threshold values, corresponding to the various monitoring signals, of an alarm threshold curve in the PLC so that the PLC can process fault alarms or fault halts according to compared trigger conditions. The method for monitoring low-frequency vibration of the wind power generation set has the advantages that resonance of a tower and blades of the wind power generation set can be effectively and accurately solved, and faults caused by other low-frequency vibrations in safety impact monitoring, driving chain vibration and engine framework can be further effectively and accurately solved.

Description

Technical field [0001] The invention belongs to the technical field of wind turbine monitoring, and in particular relates to a method for monitoring low-frequency vibration of a wind turbine. Background technique [0002] In practical applications, the main factors that cause wind turbine vibration include: rotor imbalance, resonance, mechanical failure, electrical and electromagnetic failure, etc. The operating frequency of the fan is relatively low, and the most likely faults in the fan are resonance and mechanical failure of rotating parts. In the current wind power industry, online monitoring of high-frequency rotating components such as main shafts, gearboxes, and generators has attracted considerable attention, and scientific monitoring and response plans have been made. However, there is no systematic analysis and processing method for the vibration of low-frequency components of wind turbines, such as resonance and drive chain vibration. [0003] In the prior art, after t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01M15/12F03D7/00
CPCY02E10/723Y02E10/72
Inventor 赵涛刘博郭小叶
Owner 天津瑞源电气有限公司
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