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A method for automatic extraction of natural frequencies of wind turbine blades

A wind turbine and natural frequency technology, applied in instruments, measuring devices, measuring ultrasonic/sonic/infrasonic waves, etc., can solve the problems of large fan blade structure, difficult to give artificial deterministic excitation, etc., and achieve the effect of accurate extraction

Active Publication Date: 2020-06-30
XIAN RUIYIDA WIND POWER TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the huge structure of the fan blades, once the fan enters the operation period, the blades are always in the environmental incentives, and it is difficult to give manual deterministic incentives

Method used

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  • A method for automatic extraction of natural frequencies of wind turbine blades
  • A method for automatic extraction of natural frequencies of wind turbine blades
  • A method for automatic extraction of natural frequencies of wind turbine blades

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Experimental program
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Embodiment Construction

[0052] The present invention will be further elaborated below in conjunction with the accompanying drawings and specific examples.

[0053] attached figure 1 Shown is a flow chart of a method for automatically extracting the natural frequency of a wind turbine blade, as shown in figure 1 As shown, the steps include:

[0054] Step 1: Use the dual-axis acceleration sensor to collect shimmy and waving vibration data from the fan blades, and simultaneously obtain the SCADA power parameter data of the wind turbine, and store the two types of data in a unified manner according to the corresponding clock. In step 1, the biaxial acceleration sensor is directly pasted on the inner web of the blade, and a sensor with good low-frequency response, high precision and high-quality shielded transmission cable is used to ensure the signal-to-noise ratio of the signal.

[0055] The present invention takes the 1# blade vibration signal of a unit in a certain wind field in Shandong as an example...

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Abstract

The invention discloses an automatic extraction method of inherent frequency of wind turbine generator blades. The automatic extraction method comprises the following steps of 1, using a double-shaftacceleration sensor to collect vibration data of the wind turbine generator blades in the shimmying direction and the waving direction, obtaining SCADA power parameter data of a wind turbine generator, and centralizedly storing the two types of data according to a corresponding clock; 2, judging power parameters of the stored data, wherein if the power is large than 0, the vibration data in the waving direction is selected for subsequent analysis, and if the power is equal to 0, the vibration data in the shimmying direction is selected for subsequent analysis; 3, extracting the inherent frequency from the data in the second step; 4, getting rid of harmonic modals from the obtained inherent frequency to obtain the final true inherent frequency. By arranging the acceleration sensor on the wind turbine generator blades and accessing wind field SCADA data, the vibration data and power generation parameters of the blades are collected, and accurate extraction of the inherent frequency of the blade structure is achieved. The automatic extraction method of the inherent frequency of the wind turbine generator blades has the advantages of being accurate, free of artificial interference andefficient.

Description

technical field [0001] The invention belongs to the technical field of modal analysis, and in particular relates to a method for automatically extracting the natural frequency of a blade of a wind power generator. Background technique [0002] my country's wind power industry is currently in a stage of rapid development, and its role in optimizing energy structure and promoting energy conservation and emission reduction has become increasingly prominent. However, because wind turbines are mostly installed in areas rich in wind energy, and these areas have harsh climate conditions, and the wind blades are subjected to irregular, variable-speed and variable-load wind forces, the surface damage of the blades gradually occurs during operation, such as coating peeling, pitting, etc. If the damage accumulates over time, it may lead to severe cracks in the blades. In severe cases, the blades will break and the economic loss will be huge. [0003] When dealing with the failure of b...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01H17/00
CPCG01H17/00
Inventor 张凡杨庆超白钢
Owner XIAN RUIYIDA WIND POWER TECH
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