Wind turbine generator blade and bearing crack monitoring system

Abstract

The invention provides a wind turbine generator blade and bearing crack monitoring system. The system at least comprises a sensing layer and a broken line monitoring device which are arranged on the circumferential outer wall of the root of each blade and are connected through a wire, and is also provided with a wireless receiving device and an I/O interface. Each broken line monitoring device comprises a shell, an energy storage module, an on-off monitoring module and a wireless transmitting module, wherein the wireless transmitting module is connected with the on-off monitoring module and transmits signals monitored by the on-off monitoring module; and the wireless receiving device comprises a wireless receiving module and a fault state relay connected with the I/O interface, and the I/O interface is connected with a master control PLC in a cabin. The system can directly detect the blade crack condition and send out an alarm or shutdown instruction, due to a waterproof and dustproof structure of the broken line monitoring devices, the broken line monitoring devices are not prone to being affected by the environment, the detection result is accurate, various severe environment conditions can be met, and meanwhile the system has the advantages of being simple in installation process and convenient to operate.

Description

technical field [0001] The invention belongs to the field of wind turbine monitoring, and in particular relates to a monitoring system for cracks in wind turbine blades and bearings. Background technique [0002] The monitoring of cracks in blades and bearings of wind turbines has always been a major problem for wind turbines. Especially for units that have been in service for more than 10 years, there is a high risk of cracks in blades and bearings. If it is not found and dealt with properly, it may cause the blade to break or even fall off, leading to a major safety accident. At present, ultrasonic, magnetic powder, visual, strain gauge and other detection methods are mostly used for the detection of metal cracks. Although these technologies are relatively mature, due to the limited installation space, complicated implementation process, and difficult signal acquisition during the online operation monitoring process of wind turbines, Susceptible to external environment in...

AI Technical Summary

Problems solved by technology

[0002] The monitoring of cracks in blades and bearings of wind turbines has always been a major problem for wind turbines. Especially for units that have been in service for more than 10 years, there is a high risk of cracks in blades and bearings. If it is not found and dealt with properly, it may cause the blade to break or even fall off, leading to a major safety accident.

At present, ultrasonic, magnetic powder, visual, strain gauge and other detection methods are mostly used for the detection of metal cracks. Although these technologies are relatively mature, due to the limited installation space, complicated implementation process, and difficult signal acquisition during the online operation monitoring process of wind turbines, Susceptible to external environmental interference, high cost and other aspects, there are not many technologies that can really be applied to wind turbine blades and their bearing crack monitoring in real life

[0003] In addition to ultrasonic, magnetic powder, visual, strain gauge and other detection methods, there is also a method of using conductive loops to detect cracks. For example, in patent CN2017204662132, it is formed by spraying conductive paint. The module is connected to the power module, and the signal processing module is used to output an alarm signal of a wind power bearing crack when the conductive loop is disconnected, or in the patent CN201720746196. On the surface of the bearing, the detection part is electrically connected to the conductive coating to detect the on-off state of the conductive coating and then detect the crack of the bearing; however, the above-mentioned technical solution has high requirements for the application scene and has great limitations. If the blade hub lacks the corresponding signal The transmission interface cannot be used normally, and there is still a closed-loop operation that can only provide monitoring crack signals and cannot realize analysis and judgment and control fan alarm or shutdown

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