Intelligent monitoring device for blades of wind driven generator

Abstract

The invention discloses an intelligent monitoring device for blades of a wind driven generator, which comprises a blade body, a power generator, a plurality of fiber bragg grating sensors and a fiber bragg grating signal analyzer. The blade body is mounted on a hub, the power generator is connected with the hub through a gear box and a spindle or is directly connected with the hub, the fiber bragg grating sensors are arranged on the blade body, and the fiber bragg grating signal analyzer is connected with the fiber bragg grating sensors through optical fibers and an optical fiber coupler. Besides, wavelengths of different fiber bragg grating sensors on the blade body are different, the fiber bragg grating signal analyzer measures amplitude and frequency relations of corresponding temperature, vibration and dependent variables of optical signals of different wavelengths to acquire information about vibration, dynamic balance, fatigue, deformation, load and damage of the blade body, thereby assisting working staff to handle accidents in time.

Description

technical field [0001] The invention relates to a blade monitoring of a wind power generator, in particular to an intelligent monitoring device for blades of a wind power generator. Background technique [0002] The height of the tower of a 1.5 MW wind turbine is more than 60 meters, and the diameter of the impeller is 77 meters, which means that the center of the impeller is 61 meters high from the ground, and the highest point of the blade is 98.5 meters (the lowest point is also 23.5 meters high) , The blades operate at such a high position, once they crack, are damaged by lightning, and the surface is icy, we cannot detect them in time with the naked eye. Minor problems that cannot be detected and dealt with in time will eventually lead to the breakage of the entire blade. [0003] When the wind rotor is running at the rated speed, the linear speed of the blade tip is 70 m / s (this is equivalent to the speed of a car traveling at a super high speed of 252 kilometers per ...

AI Technical Summary

Problems solved by technology

At present, the damage to the blades during the operation of the fan is not discovered until the shutdown or serious consequences are caused, and the losses caused are conceivable

[0005] As the wind turbines get bigger and bigger, the blades are lengthened accordingly (45M / 2MW, 54M / 3MW, 61M / 5MW). The flexibility of large-size blades is greatly increased, so that the blades often operate at high angles of attack, and the stall phenomenon is serious, causing fatigue vibration of the blades, and reduce power generation efficiency

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