Airborne laser wind finding radar based on doubly-fed wind turbine generator

Abstract

The invention belongs to the technical field of laser wind-finding radars, and discloses an airborne laser wind-finding radar based on a doubly-fed wind turbine generator, which comprises a first hexagon-headed bolt, a first holder, a holder upper seat, a locking device and a second holder, and is characterized in that the outer surface of the first hexagon-headed bolt is in threaded sleeve connection with a first nut; an in-cabin baffle is fixedly mounted at the top of the first nut, and a cabin top plate is movably mounted at the top of the in-cabin baffle. Three-dimensional wind field information is captured in real time through the wind radar, an intelligent digital wind eye is created for the fan, and the core value of the intelligent digital wind eye is embodied in three aspects that on the safety control level, wind regime sudden change early warning is achieved through the laser detection technology, sufficient pre-adjustment time windows are reserved for a main control system, and the safety of the fan is improved. The response efficiency of the variable pitch system is obviously optimized, and extreme load impact is effectively relieved; and in the aspect of operation efficiency, aerodynamic performance optimization is realized through three-dimensional reconstruction of a wind speed field.

Description

Technical Field

[0001] This invention belongs to the field of laser wind measurement radar technology, specifically an airborne laser wind measurement radar based on a doubly fed wind turbine. Background Technology

[0002] As the wind power industry develops towards greater precision, the limitations of traditional wind measurement technologies are becoming increasingly apparent. Existing anemometers are mostly installed behind the rotor, and their measurement data is affected by the complex swirling and wake disturbances generated by the rotor's rotation. The measured wind speed is a distorted value after attenuation, significantly deviating from the actual wind speed in front of the rotor. This measurement error directly leads to inaccurate power prediction, failing to meet the accuracy requirements of closed-loop control systems. Simultaneously, sensor installation deviations cause continuous angle measurement errors, not only resulting in annual power generation losses but also exacerbating the uneven distribution of thrust in the rotor plane. This subjects the unit to alternating loads under non-design conditions, accelerating fatigue damage to key components over long-term operation, becoming a core technological bottleneck restricting the improvement of wind farm efficiency. Summary of the Invention

[0003] The purpose of this invention is to provide an airborne laser wind measuring radar based on a doubly fed wind turbine to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, the present invention provides the following technical solution: an airborne laser wind measuring radar based on a doubly fed wind turbine, comprising a first hexagonal head bolt, a first gimbal, a gimbal mount and locking device, and a second gimbal. The outer surface of the first hexagonal head bolt is threaded with a first nut, and an internal baffle is fixedly installed on the top of the first nut. A nacelle top plate is movably installed on the top of the internal baffle.

[0005] Preferably, a first lightning rod is movably mounted on the top of the first gimbal, a second hexagonal head bolt is threaded into the internal threads of the first lightning rod and the first gimbal, and a third flat washer is movably mounted between the second hexagonal head bolt and the first lightning rod.

[0006] Preferably, a third hexagonal head bolt is fixedly installed on the top of the gimbal and the locking device, a fifth flat washer is movably installed on the top of the third hexagonal head bolt, a ground anchor is movably installed on the top of the fifth flat washer, and a fall arrestor rope is movably installed on the front of the ground anchor.

[0007] Preferably, a second lightning rod is fixedly installed on the top of the second pan-tilt unit, an OH optical head is fixedly installed on the top of the second lightning rod, and a wire-passing rubber is fixedly installed on the bottom of the second pan-tilt unit.

[0008] Preferably, a second nut is threaded onto the outer surface of the second hexagonal head bolt, and a fourth flat washer is movably installed between the second nut and the first gimbal.

[0009] Preferably, a gimbal support base is movably installed on the top of the cabin roof, and a second flat washer is movably installed between the gimbal support base and the first hexagonal head bolt.

[0010] Preferably, a ground anchor is movably mounted on the top of the fifth flat washer, and a fall arrestor rope is movably mounted on the front of the ground anchor.

[0011] Preferably, a second hexagonal nut is movably mounted on the top of the gimbal and the locking device, and a first hexagonal nut is movably mounted inside the second hexagonal nut.

[0012] Preferably, the outer surface of the OH optical head is fixed with a flight cable, and one end of the flight cable passes through the interior of the cable guide rubber. A DU data storage unit is fixedly installed at one end of the flight cable.

[0013] Preferably, a first flat washer is movably installed between the first nut and the cabin baffle.

[0014] The beneficial effects of this invention are as follows:

[0015] 1. This invention utilizes wind radar to capture three-dimensional wind field information in real time, creating an intelligent "digital wind eye" for wind turbines. Its core value is reflected in three aspects: In terms of safety control, it relies on laser detection technology to achieve early warning of sudden wind changes, reserves sufficient pre-adjustment time window for the main control system, significantly optimizes the response efficiency of the pitch system, and effectively mitigates the impact of extreme loads; In terms of operational efficiency, it optimizes aerodynamic performance through three-dimensional reconstruction of the wind speed field, continuously maintaining the best working state, while improving energy capture accuracy through dynamic wind correction technology; In terms of equipment maintenance, it establishes a load management system based on real-time operating conditions, significantly delays fatigue accumulation of key components, and constructs a comprehensive safety barrier with multiple protection mechanisms, achieving optimization of the entire life cycle cost.

[0016] 2. This invention achieves wind speed measurement using a wind-measuring radar based on the motion characteristics of aerosols and the Doppler effect of lasers. Suspended aerosol particles in the atmosphere move with the wind, and their speed is directly proportional to the wind speed. The radar emits a narrow-linewidth pulsed laser to illuminate the target area. The aerosol particles scatter the laser light using Mie scattering, and the scattered light undergoes a frequency shift due to the Doppler effect. This frequency shift is proportional to the radial wind speed. The system employs an all-fiber coherent detection architecture. The seed source laser is split into two paths by a beam splitter: one path serves as the local oscillator, maintaining the original frequency fL, and the other... After passing through an acousto-optic modulator (AOM) and frequency shifted by fAOM, the emitted light (fL+fAOM) is generated. After being amplified by an optical fiber amplifier, the emitted light is projected into the monitoring airspace through a transmitting antenna. The echo signal (fL+fAOM+fD) carrying wind speed information is mixed with the local oscillator light in a balanced detector to generate a difference frequency signal containing a Doppler frequency shift fD. After being amplified by transimpedance and converted from analog to digital, the signal is subjected to spectral analysis through digital signal processing. Finally, the accurate radial wind speed component is calculated based on the linear relationship between fD and wind speed.

[0017] 3. This invention utilizes an airborne laser wind-measuring radar based on a doubly-fed induction generator (DFIG) wind turbine. Employing coherent detection technology and a narrow-linewidth pulsed laser as the light source, it captures Doppler frequency shift information from aerosol backscattering to achieve precise measurement of wind speed and direction within a 50-200 meter range in front of the radar. The device integrates high-precision signal processing algorithms and a three-dimensional wind field inversion model, enabling real-time analysis of radial wind speed components at different distances and reconstructing key parameters such as the wind speed vector field, turbulence intensity, and wind shear index. Its technical advantages lie in: achieving second-level perception of meteorological elements in the area in front of the wind turbine through forward wind condition monitoring; and dynamically optimizing the impeller angle and pitch angle of the DFIG unit through yaw-pitch coordinated control, ensuring the unit maintains the optimal angle of attack and significantly improving wind energy capture efficiency. This device forms a closed-loop control system of "detection-analysis-execution," effectively reducing gust impact loads, extending unit lifespan, and providing key technical support for increasing power generation under complex wind conditions. Attached Figure Description

[0018] Figure 1 This is a block diagram of the cabin-type lidar of the present invention;

[0019] Figure 2 This is a schematic diagram of the beam numbering of the present invention;

[0020] Figure 3 This is a schematic diagram of the beam angle of the present invention;

[0021] Figure 4 This is a schematic diagram of the beam direction of the present invention;

[0022] Figure 5 This is a schematic diagram of the bolt installation of the gimbal bracket of the present invention;

[0023] Figure 6This is a schematic diagram of the lightning rod structure of the present invention;

[0024] Figure 7 This is a schematic diagram of the gimbal structure of the present invention;

[0025] Figure 8 This is a schematic diagram of the DU grounding wire installation method of the present invention;

[0026] Figure 9 This is a schematic diagram of the OH installation and adjustment of the present invention;

[0027] Figure 10 This is a schematic diagram of the wire-passing rubber plug structure for tightening the wire-passing opening on the top of the fan nacelle according to the present invention;

[0028] Figure 11 This is a schematic diagram showing the connector at the other end of the data cable of the present invention installed on the PU's connector.

[0029] Figure 12 This is a schematic diagram showing the OH mounting orientation of the present invention;

[0030] Figure 13 This is a schematic diagram of the OH pointing tooling of the present invention;

[0031] Figure 14 This is a schematic diagram of the OH pointing tooling of the present invention.

[0032] Figure 15 This is a schematic diagram of the wind turbine wind measurement radar of the present invention.

[0033] In the diagram: 1. First hexagonal head bolt; 2. First nut; 3. First flat washer; 4. Cabin interior baffle; 5. Cabin roof plate; 6. Gimbal support base; 7. Second flat washer; 8. First lightning rod; 9. First gimbal; 10. Second hexagonal head bolt; 11. Third flat washer; 12. Fourth flat washer; 13. Second nut; 14. Third hexagonal head bolt; 15. Fifth flat washer; 16. Anchor post; 17. Fall arrestor rope; 18. First hexagonal nut; 19. Second hexagonal nut; 20. Gimbal mount and locking device; 21. OH optical head; 22. Second lightning rod; 23. Second gimbal; 24. Cable guide rubber; 25. Aviation cable; 26. DU data storage unit. Detailed Implementation

[0034] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0035] like Figures 1 to 15As shown, this embodiment of the invention provides an airborne laser wind measuring radar based on a doubly fed wind turbine, including a first hexagonal head bolt 1, a first gimbal 9, a gimbal mount and locking device 20 and a second gimbal 23. The outer surface of the first hexagonal head bolt 1 is threaded with a first nut 2. An inner baffle 4 is fixedly installed on the top of the first nut 2. A nacelle top plate 5 is movably installed on the top of the inner baffle 4. A first flat washer 3 is movably installed between the first nut 2 and the inner baffle 4.

[0036] When installing the first gimbal 9, the staff first precisely positioned the gimbal bracket base 6 on the outside of the nacelle top plate 5, ensuring that the reserved holes were fully aligned. Then, the nacelle baffle 4 was placed in the corresponding position inside the nacelle. The first hexagonal head bolt 1 was then inserted from the outside to the inside, sequentially through the first flat washer 3, the gimbal bracket base 6, the nacelle top plate 5, the nacelle baffle 4, and the second flat washer 7. Finally, the first nut 2 was tightened to form a reliable connection. This process must ensure that all components fit tightly and that the tightening torque of the gimbal bracket base 6 meets the specifications, ensuring the structural stability of the first gimbal 9 and providing a solid foundation for the subsequent installation of the lightning rod and temperature, humidity, and pressure sensor.

[0037] The first lightning rod 8 is movably installed on the top of the first gimbal 9. The first lightning rod 8 and the first gimbal 9 are connected by a second hexagonal head bolt 10 through their internal threads. A third flat washer 11 is movably installed between the second hexagonal head bolt 10 and the first lightning rod 8.

[0038] The staff integrated the first lightning rod 8 with the temperature, humidity, and pressure sensor through a hierarchical layout. The temperature, humidity, and pressure bracket served as a base, fixed to the surface of the first gimbal 9, with its lower structure providing a stable monitoring platform for the sensor. The first gimbal 9 was vertically stacked on the upper layer, using a metal bracket to form an electrical conduction path. The second hexagonal head bolt 10 passed through the third flat washer 11, the base of the first lightning rod 8, the first gimbal 9, and the lower fourth flat washer 12 from top to bottom. Then, the second nut 13 was screwed onto the outer surface of the fourth flat washer 12, achieving mechanical locking through the thread engagement of the second hexagonal head bolt 10 and the fourth flat washer 12. This also constructed a lightning conduction channel from the lightning rod to the gimbal to the nacelle. This double-layer structure ensures the accuracy of environmental parameter acquisition and guarantees the grounding reliability of the lightning protection device through rigid connections. The third flat washer 11 and the fourth flat washer 12 effectively disperse compressive stress and prevent bolt loosening, thus meeting the dual requirements of lightning protection and condition monitoring for wind power equipment.

[0039] Among them, the top of the gimbal base and the locking device 20 is fixedly installed with a third hexagonal head bolt 14, the top of the third hexagonal head bolt 14 is movably installed with a fifth flat washer 15, the top of the fifth flat washer 15 is movably installed with a foot post 16, and the front of the foot post 16 is movably installed with a fall arrest rope 17.

[0040] Workers secure the OH body to the surface of the first gimbal 9 using the third hexagonal head bolt 14 and the fifth flat washer 15, forming a rigid connection base. 272 ​​thread-locking adhesive fills the thread gaps, utilizing chemical bonding to prevent the third hexagonal head bolt 14 from loosening due to vibration. The anchor column 16 serves as a vertical support, working in conjunction with the fall arrestor rope 17 to form a secondary protection system to prevent accidental falls. The first hexagonal nut 18 and the second hexagonal nut 19, along with the gimbal mount and locking device 20, achieve standardized preload through torque control, ensuring the OH maintains stable posture under wind turbine operation conditions and meeting the installation requirements of meteorological monitoring or communication equipment.

[0041] The fall arrestor rope 17 forms a dual protection mechanism through physical constraints. One end is fixed to the OH (overhead jack) ring, and the other end is anchored to the external structural component of the wind turbine nacelle, ensuring the equipment remains suspended even if the main fixation fails. The grounding wire uses a combination of copper lugs and double flat washers to ensure a low-impedance conductive path between the OH and the support, effectively dissipating static charge and induced current. The data cable achieves plug-and-play connection via an aviation connector, with its shielding layer interconnected with the grounding system. This ensures real-time transmission of wind speed and direction data while suppressing electromagnetic interference on signal integrity. This triple protection enhances the reliability of the OH operation. Figure 10 , 11 As shown.

[0042] The second pan-tilt unit 23 is fixedly mounted with a second lightning rod 22, and the second lightning rod 22 is fixedly mounted with an OH optical head 21. The second pan-tilt unit 23 is fixedly mounted with a wire-passing rubber 24 at its bottom.

[0043] The wind turbine wind measurement radar system uses the OH optical head 21 as its core. It emits laser pulses and receives scattered light from aerosol particles in the atmosphere, using the Doppler frequency shift principle to accurately calculate wind speed and direction. The second gimbal 23 provides horizontal rotation and pitch adjustment functions to ensure the optical head is accurately aligned with the measurement area; its control accuracy directly affects the spatial sampling resolution of the wind field. The second lightning rod 22, made of fiberglass, constructs a lightning protection network to ensure stable operation of the system in adverse weather conditions. The aviation cable 25 and the guide rubber 24 jointly realize data transmission and equipment protection, ensuring signal stability and environmental adaptability. The DU data storage unit 26 is responsible for data acquisition, storage, and preprocessing, supporting real-time wind field data output and providing key parameters for wind farm power prediction and control. All components work together to form a high-precision, high-reliability three-dimensional wind field monitoring solution. The OH should be parallel to the main axis of the wind turbine nacelle at an angle of less than one degree. Figure 12 As shown.

[0044] The second hexagonal head bolt 10 has a second nut 13 threaded onto its outer surface, and a fourth flat washer 12 is movably installed between the second nut 13 and the first gimbal 9.

[0045] The calibration fixture is precisely aligned with the OH (Hydraulic Oxide) via its own locating pin, and then fastened to the lower cavity using an internal hexagonal head screw, thus achieving precise adjustment of the OH's orientation. Figure 13 As shown;

[0046] Among them, a gimbal bracket base 6 is movably installed on the top of the cabin roof plate 5, and a second flat washer 7 is movably installed between the gimbal bracket base 6 and the first hexagonal head bolt 1.

[0047] After installation, turn on the calibration fixture battery box switch. The device will then emit an indicator light for precise calibration of the OH direction. Figure 14 As shown.

[0048] The wind-measuring radar system consists of five core modules, enabling precise detection of wind speed vectors. The main oscillation system uses a narrow-linewidth seed source as the fundamental frequency, modulated into a pulse sequence by an acousto-optic modulator. A beam splitter distributes the beam to the local oscillator and the transmitted optical path according to a set power ratio. An optical amplifier enhances the power of the transmitted pulses, ensuring detection range and signal-to-noise ratio. The transceiver system achieves optical path isolation through a circulator. An optical antenna directionally projects the pulsed laser into the monitoring airspace and receives aerosol backscattered signals. In the signal processing link, an adjustable optical attenuator (VOA) dynamically matches the power of the local oscillator beam and the signal beam. A balanced detector performs optical heterodyne mixing, converting the Doppler frequency shift into an electrical signal. After transimpedance amplification and analog-to-digital conversion, the digital signal processing unit performs FFT spectrum analysis and wind speed inversion. The power supply system provides stable power to each module, ensuring stable operation of the entire link in complex electromagnetic environments, ultimately achieving high-precision reconstruction of the three-dimensional wind field. Figure 1 As shown.

[0049] The main oscillation system employs a narrow-linewidth seed source and acousto-optic modulation technology to generate a highly stable pulse sequence. Combined with intelligent beam splitting design, it simultaneously ensures the purity of the local oscillator optical path and the energy efficiency of the transmitting optical path. The optical amplifier achieves pulse energy output at the microjoule level, overcoming atmospheric attenuation limitations and extending the effective detection range. The transceiver system achieves transmit / receive optical path isolation through a circulator, and, in conjunction with a high-precision optical antenna, completes spatial directional scanning and weak scattered signal capture. The signal processing link integrates adaptive optical attenuation and balanced detection technology to dynamically optimize mixing efficiency. Combined with FPGA real-time FFT processing, it achieves nanosecond-level spectrum analysis. The power supply system adopts a redundant design and electromagnetic compatibility optimization to ensure stable operation of the entire link in environments with strong electromagnetic interference. Ultimately, this constructs a three-dimensional wind field monitoring capability with continuous spatial coverage, accurate parameters, and real-time response.

[0050] Among them, the top of the fifth flat washer 15 is movably installed with a ground anchor 16, and the front of the ground anchor 16 is movably installed with a fall arrest rope 17.

[0051] After installing the calibration fixture, the battery box emits an indicator light. The light beam is then aligned parallel to the nacelle's main axis by adjusting the gimbal mount, ensuring precise OH (overhead homing) alignment. Once power is connected, the radar's spatial attitude is adjusted using a mechanical adjustment mechanism, ensuring the roll angle is strictly controlled within ±0.3° error, and the pitch angle is calibrated to ±0.5° accuracy according to the model parameters. This process, through a combination of optical alignment and mechanical attitude adjustment, guarantees both the spatial pointing accuracy of the anemometer and the strict perpendicularity of the radar beam to the incoming flow direction, laying the foundation for subsequent high-precision wind field parameter measurements.

[0052] Among them, a second hexagonal nut 19 is movably installed on the top of the gimbal and the locking device 20, and a first hexagonal nut 18 is movably installed inside the second hexagonal nut 19.

[0053] The DU data storage unit adopts a magnetic installation design; its external dimensions and magnetic position are as follows: Figure 6 Standardized installation procedures. Prioritize flat areas within the engine room to minimize vibration and ensure a clean layout of surrounding equipment. Keep away from high-voltage cables, frequency converters, and other sources of strong electromagnetic interference. A distance of at least 1 meter between the equipment and the generator allows for flexible placement; installation near the engine control cabinet is recommended for easy cable management. After determining the location, vertically attach the DU magnetic angle bracket to the metal base. Reliably connect non-aviation connectors (power, communication, etc.) sequentially, and properly connect the grounding cables to ensure electrical safety and signal integrity, ultimately forming a stable and reliable airborne data hub. Figure 8 As shown.

[0054] Among them, the outer surface of the OH optical head 21 is fixed with the aviation cable 25, and one end of the aviation cable 25 passes through the inside of the cable guide rubber 24. The aviation cable 25 is fixedly installed with the DU data storage unit 26 at one end.

[0055] The radar employs a four-beam laser design, with selectable vertical angles of 25° or 10° and horizontal angles of 30°, constructing a three-dimensional scanning layout to achieve high-precision detection of wind field parameters. For example... Figure 2 As shown.

[0056] A first flat washer 3 is movably installed between the first nut 2 and the inner baffle 4.

[0057] The optical head incorporates an electronic compass to achieve closed-loop control of the radar beam's spatial attitude. It uses high-precision sensors to monitor in real time the Roll angle around the X-axis, the Tilt angle around the Y-axis, and the Yaw angle around the Z-axis. The Roll angle reflects the horizontal axial rotation of the optical head, the Tilt angle represents the vertical axial pitch, and the Yaw angle defines the rotational azimuth in the horizontal plane. The electronic compass feeds back the three-dimensional angle data to the main control system, forming a dynamic calibration mechanism to ensure that the laser beam always accurately points to the preset detection azimuth, especially maintaining a roll accuracy of ±0.3° and a pitch accuracy of ±0.5° under complex airflow conditions, providing a reliable geometric reference for wind speed vector calculation. Figure 3 As shown.

[0058] Working principle and usage process:

[0059] When installing the first gimbal 9, the staff first precisely positioned the gimbal bracket base 6 on the outside of the nacelle top plate 5, ensuring that the reserved holes were fully aligned. Then, the nacelle baffle 4 was placed in the corresponding position inside the nacelle. The first hexagonal head bolt 1 was then inserted from the outside to the inside, sequentially through the first flat washer 3, the gimbal bracket base 6, the nacelle top plate 5, the nacelle baffle 4, and the second flat washer 7. Finally, the first nut 2 was tightened to form a reliable connection. This process must ensure that all components fit tightly and that the tightening torque of the gimbal bracket base 6 meets the specifications, ensuring the structural stability of the first gimbal 9 and providing a solid foundation for the subsequent installation of the lightning rod and temperature, humidity, and pressure sensor.

[0060] The staff integrated the first lightning rod 8 with the temperature, humidity, and pressure sensor through a hierarchical layout. The temperature, humidity, and pressure bracket served as a base, fixed to the surface of the first gimbal 9, with its lower structure providing a stable monitoring platform for the sensor. The first gimbal 9 was vertically stacked on the upper layer, using a metal bracket to form an electrical conduction path. The second hexagonal head bolt 10 passed through the third flat washer 11, the base of the first lightning rod 8, the first gimbal 9, and the lower fourth flat washer 12 from top to bottom. Then, the second nut 13 was screwed onto the outer surface of the fourth flat washer 12, achieving mechanical locking through the thread engagement of the second hexagonal head bolt 10 and the fourth flat washer 12. This also constructed a lightning conduction channel from the lightning rod to the gimbal to the nacelle. This double-layer structure ensures the accuracy of environmental parameter acquisition and guarantees the grounding reliability of the lightning protection device through rigid connections. The third flat washer 11 and the fourth flat washer 12 effectively disperse compressive stress and prevent bolt loosening, thus meeting the dual requirements of lightning protection and condition monitoring for wind power equipment.

[0061] Workers secure the OH body to the surface of the first gimbal 9 using the third hexagonal head bolt 14 and the fifth flat washer 15, forming a rigid connection base. 272 ​​thread-locking adhesive fills the thread gaps, utilizing chemical bonding to prevent the third hexagonal head bolt 14 from loosening due to vibration. The anchor column 16 serves as a vertical support, working in conjunction with the fall arrestor rope 17 to form a secondary protection system to prevent accidental falls. The first hexagonal nut 18 and the second hexagonal nut 19, along with the gimbal mount and locking device 20, achieve standardized preload through torque control, ensuring the OH maintains stable posture under wind turbine operation conditions and meeting the installation requirements of meteorological monitoring or communication equipment.

[0062] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0063] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An airborne laser wind measuring radar based on a doubly fed wind turbine, comprising a first hexagonal head bolt (1), a first gimbal (9), a gimbal mount and locking device (20), and a second gimbal (23), characterized in that: The outer surface of the first hexagonal head bolt (1) is threaded with a first nut (2), and the top of the first nut (2) is fixedly installed with an internal baffle (4), and the top of the internal baffle (4) is movably installed with a cabin top plate (5).

2. The airborne laser wind measuring radar based on a doubly-fed wind turbine as described in claim 1, characterized in that: A first lightning rod (8) is movably installed on the top of the first gimbal (9). A second hexagonal head bolt (10) is threaded into the internal threads of the first lightning rod (8) and the first gimbal (9). A third flat washer (11) is movably installed between the second hexagonal head bolt (10) and the first lightning rod (8).

3. The airborne laser wind measuring radar based on a doubly-fed wind turbine as described in claim 1, characterized in that: The top of the gimbal and locking device (20) is fixedly installed with a third hexagonal head bolt (14), the top of the third hexagonal head bolt (14) is movably installed with a fifth flat washer (15), the top of the fifth flat washer (15) is movably installed with a foot post (16), and the front of the foot post (16) is movably installed with a fall arrest rope (17).

4. The airborne laser wind measuring radar based on a doubly-fed wind turbine as described in claim 1, characterized in that: The second pan-tilt unit (23) is fixedly equipped with a second lightning rod (22), the second lightning rod (22) is fixedly equipped with an OH optical head (21), and the second pan-tilt unit (23) is fixedly equipped with a wire-passing rubber (24).

5. The airborne laser wind measuring radar based on a doubly-fed wind turbine as described in claim 2, characterized in that: The outer surface of the second hexagonal head bolt (10) is threaded with a second nut (13), and a fourth flat washer (12) is movably installed between the second nut (13) and the first gimbal (9).

6. The airborne laser wind measuring radar based on a doubly fed wind turbine as described in claim 1, characterized in that: A gimbal support base (6) is movably installed on the top of the cabin top plate (5), and a second flat washer (7) is movably installed between the gimbal support base (6) and the first hexagonal head bolt (1).

7. The airborne laser wind measuring radar based on a doubly fed wind turbine as described in claim 3, characterized in that: The top of the fifth flat washer (15) is movably mounted with a foot post (16), and the front of the foot post (16) is movably mounted with a fall arrest rope (17).

8. The airborne laser wind measuring radar based on a doubly fed wind turbine as described in claim 3, characterized in that: A second hexagonal nut (19) is movably installed on the top of the gimbal and locking device (20), and a first hexagonal nut (18) is movably installed inside the second hexagonal nut (19).

9. The airborne laser wind measuring radar based on a doubly fed wind turbine as described in claim 4, characterized in that: The outer surface of the OH optical head (21) is fixed with a flight cable (25), and one end of the flight cable (25) passes through the inside of the cable guide rubber (24). A DU data storage unit (26) is fixedly installed at one end of the flight cable (25).

10. The airborne laser wind measuring radar based on a doubly-fed wind turbine as described in claim 1, characterized in that: A first flat washer (3) is movably installed between the first nut (2) and the cabin baffle (4).

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