Test platform and test method for sliding yaw system of wind driven generator

Abstract

The invention discloses a test platform and a test method for a sliding yaw system of a wind driven generator, the test platform comprises a main supporting seat, a central support, a yaw simulation device, an axial loading device, a radial loading device, a driving device and a control device, the yaw simulation device is fixed on the central support, the central support is fixed on the main supporting seat, and the axial loading device and the radial loading device are fixed on the main supporting seat. A plurality of axial loading devices are uniformly distributed on the outer side of the yaw simulation device along the circumference, the axial loading devices are electrically connected with the driving device, a radial loading device is arranged on the outer side of the yaw simulation device and located between any two adjacent axial loading devices, the radial loading devices are electrically connected with the driving device, and the driving device is electrically connected with the yaw simulation device. And the control device is electrically connected with the yaw simulation device, the axial loading device, the radial loading device and the driving device. The device has the advantages of being simple in structure, low in cost, accurate and efficient in test data and the like, and the reliability of sliding yaw system design is improved by obtaining measured values of characteristic parameters of components of the yaw system.

Description

Technical Field

[0001] The invention relates to the technical field of wind power generation, and in particular to a wind power generator sliding yaw system test platform and a test method. Background Art

[0002] For wind turbines with sliding yaw systems, the characteristic parameters of the yaw drive and yaw brake friction pads have a significant and direct impact on the simulation results of the yaw system when designing the yaw system. If the characteristic parameters are selected too conservatively, the designed yaw system will be heavy and costly; if the characteristic parameters are selected too aggressively, the safety of the wind turbine will be seriously affected. Therefore, it is very necessary to establish a sliding yaw system test device to obtain the measured values ​​of the characteristic parameters of the yaw components to ensure the reliability of the yaw system design.

[0003] There are two main types of conventional sliding yaw system test devices; one is to perform tests when the wind turbine is online by attaching strain gauges, adding sensors, deploying data acquisition equipment, etc. Since the external load is provided by the wind load, it is difficult to accurately measure the corresponding relationship between the load and force on the yaw system; the other is to directly move the yaw system components of the wind turbine to the test site for testing. Usually, only driving torque can be applied. If the external load on the yaw system is to be applied, major modifications to the entire component are required. Summary of the invention

[0004] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a wind turbine sliding yaw system test platform with the advantages of simple structure, low cost, accurate and efficient test data, etc., and to improve the reliability of the sliding yaw system design by obtaining the measured values ​​of the characteristic parameters of the yaw system components.

[0005] Another object of the present invention is to provide a method for testing a sliding yaw system of a wind turbine.

[0006] The purpose of the present invention is achieved through the following technical solutions:

[0007] A wind turbine sliding yaw system test platform comprises a main support seat, a central support, a yaw simulation device, an axial loading device, a radial loading device, a driving device and a control device, wherein the yaw simulation device is fixed on the central support, and the central support is fixed on the main support seat, a plurality of axial loading devices are evenly distributed along the circumference on the outer side of the yaw simulation device, the axial loading device is electrically connected to the driving device, and the driving device drives the axial loading device to load an axial force on the yaw simulation device, a radial loading device is arranged on the outer side of the yaw simulation device and between any two adjacent axial loading devices, the radial loading device is electrically connected to the driving device, and the driving device drives the radial loading device to load a radial force on the yaw simulation device, the control device is electrically connected to the yaw simulation device, the axial loading device, the radial loading device and the driving device, and the control device electrically controls the yaw simulation device, the axial loading device, the radial loading device and the driving device, and the yaw simulation device comprises an upper A yaw brake to be tested, a lower yaw brake to be tested, a yaw gear ring, a yaw brake disc, a yaw drive, a yaw bracket and a gear ring support ring, wherein the upper yaw brake to be tested and the lower yaw brake to be tested are arranged symmetrically up and down, and the lower yaw brake to be tested is fixed to the top of the central bracket, and the upper yaw brake to be tested is fixed to the bottom of the yaw bracket, the yaw gear ring is arranged on the outer side of the upper yaw brake to be tested, and the yaw brake disc is arranged on the outer side of the lower yaw brake to be tested, and The yaw gear ring is clamped by the first upper friction plate, the first lower friction plate and the first side friction plate of the upper yaw brake to be tested, and the yaw brake disc is clamped by the second upper friction plate, the second lower friction plate and the second side friction plate of the lower yaw brake to be tested. The yaw gear ring and the yaw brake disc are connected by a gear ring support ring, and multiple yaw drives are evenly distributed on the yaw bracket along the circumference, and multiple yaw drive output gears are meshed with the yaw gear ring, and the yaw gear ring and the yaw brake disc are driven to rotate by the yaw drive.

[0008] Furthermore, the axial loading device includes an axial loading hydraulic cylinder, a first connecting shaft, a support pad, an axial loading support frame, a bottom support seat, a top support seat and a tension and compression tester. The top of the axial loading hydraulic cylinder is connected to one end of the first connecting shaft through the top support seat, and the bottom of the axial loading hydraulic cylinder is connected to the main support seat through the bottom support seat. The first connecting shaft is supported on the axial loading support frame through the support pad, and the other end thereof is connected to the yaw support. The axial loading support frame is fixed on the main support seat, and the movement of the first connecting shaft in the radial direction of the yaw simulation device is limited by the axial loading support frame, and the first connecting shaft is enabled to move in the axial direction of the yaw simulation device. The axial loading hydraulic cylinder is provided with a tension and compression tester for detecting the magnitude of the loading force, and the magnitude of the loading force is controlled by controlling the pressure of the axial loading hydraulic cylinder.

[0009] Furthermore, the radial loading device includes a radial loading hydraulic cylinder, a radial hydraulic cylinder support, a radial loading support frame, a second connecting shaft, a double roller support head and a tension and compression tester. The radial loading hydraulic cylinder is supported on the main support seat through the radial hydraulic cylinder support, and the radial loading hydraulic cylinder is connected to one end of the second connecting shaft. The second connecting shaft is supported on the radial loading support frame, and the other end thereof is connected to the outer wall of the gear ring support ring through the double roller support head. The radial loading hydraulic cylinder is provided with a tension and compression tester for detecting the size of the loading force, and the loading force is controlled by controlling the pressure of the radial loading hydraulic cylinder.

[0010] Furthermore, a torque meter is provided on the output gear shaft of the yaw drive to detect the magnitude of the yaw drive output torque.

[0011] Further, the first upper friction plate is installed on the bottom surface of the yaw bracket by bolts, the first lower friction plate and the first side friction plate are installed on the bottom surface and the side surface of the upper yaw brake to be tested by bolts, the second lower friction plate is installed on the top surface of the center bracket by bolts, and the second upper friction plate and the second side friction plate are installed on the top surface and the side surface of the lower yaw brake to be tested by bolts.

[0012] Furthermore, a first lower pressure sensor and a first side pressure sensor for detecting the pressure magnitudes of corresponding friction plates are respectively arranged inside the upper yaw brake to be tested and located close to the first lower friction plate and the first side friction plate; a first upper pressure sensor for detecting the pressure magnitudes of corresponding friction plates is arranged inside the yaw bracket and located close to the first upper friction plate; a second upper pressure sensor and a second side pressure sensor for detecting the pressure magnitudes of corresponding friction plates are respectively arranged inside the lower yaw brake to be tested and located close to the second upper friction plate and the second side friction plate; a second lower pressure sensor for detecting the pressure magnitudes of corresponding friction plates is arranged inside the center bracket and located close to the second lower friction plate.

[0013] Furthermore, there are four axial loading devices.

[0014] Another object of the present invention is achieved by the following technical solutions:

[0015] A wind turbine sliding yaw system test method is implemented based on the wind turbine sliding yaw system test platform, comprising the steps of:

[0016] S1. Test the resistance of the yaw simulation device under no-load condition and calibrate the yaw simulation device;

[0017] S2, controlling the driving device through the control device to drive the axial loading device to load thrust to the yaw simulation device, so that the first lower friction plate and the second lower friction plate are respectively fitted with the yaw gear ring and the yaw brake disc, starting the yaw drive to rotate the yaw gear ring and the yaw brake disc, and calculating the friction coefficients of the two lower friction plates according to the output torque of the yaw drive and the pressures of the first lower friction plate and the second lower friction plate;

[0018] S3, controlling the driving device through the control device to drive the axial loading device to load a tensile force on the yaw simulation device, so that the first upper friction plate and the second upper friction plate are respectively fitted with the yaw gear ring and the yaw brake disc, starting the yaw drive to rotate the yaw gear ring and the yaw brake disc, and calculating the friction coefficients of the two upper friction plates according to the output torque of the yaw drive and the pressures of the first upper friction plate and the second upper friction plate;

[0019] S4. Control the driving device through the control device to drive the radial loading device to load thrust to the yaw simulation device, so that the first side friction plate and the second side friction plate are respectively fitted with the yaw gear ring and the yaw brake disc, start the yaw drive to rotate the yaw gear ring and the yaw brake disc, and calculate the friction coefficients of the two side friction plates according to the output torque of the yaw drive and the pressures of the first side friction plate and the second side friction plate.

[0020] Furthermore, the output power of the yaw motor of the yaw drive is measured, and then the yaw drive efficiency is calculated according to the output power of the yaw motor and the output torque and rotation speed of the yaw drive.

[0021] Furthermore, the control device controls the driving device to drive two axial loading devices 180° apart to load thrust and tension to the yaw simulation device respectively, simulating yaw bending moment loading, and starting the yaw drive to rotate the yaw gear ring and yaw brake disc, and then calculate the uneven load coefficient of the friction plate according to the pressure of each friction plate.

[0022] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0023] 1. The test platform of the present invention adopts the method of fixing the yaw drive and the yaw brake, and rotating the yaw gear ring and the yaw brake disc, so that the overall structure of the test platform is greatly simplified. On the basis of meeting the requirements for key characteristic parameter testing, the cost of the test platform is significantly reduced, and the operation of the test platform is also simpler.

[0024] 2. In the present invention, the yaw brake is divided into upper and lower layers and arranged back to back. When a single axial force is applied, the friction plates on the two brakes can be subjected to equal force, thereby making the friction coefficient of the friction plate more accurately measured.

[0025] 3. The radial loading hydraulic cylinder of the present invention adopts a double roller contact head to contact the gear ring support ring to realize radial force transmission, and radial force loading can be performed without affecting the torque transmission of the yaw simulation device. It has a simple structure and is easy to operate.

[0026] 4. The yaw brake in the present invention adopts a customized design and a built-in pressure sensor, which can meet the testing requirements of various types of friction plates.

[0027] 5. The present invention adopts four external hydraulic cylinders to load the axial force. The magnitude of the loaded axial force can be directly controlled by controlling the pressure of the hydraulic cylinders. The torque loading can also be simulated by applying different pressures to the four hydraulic cylinders. The loading device has a simple structure and is easy to operate. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a schematic diagram of the three-dimensional structure of the sliding yaw system test platform.

[0029] Figure 2 This is the main view of the sliding yaw system test platform.

[0030] Figure 3 Top view of the sliding yaw system test platform.

[0031] Figure 4 for Figure 3 AA section view.

[0032] Figure 5 for Figure 4 A partial enlarged view of point D in the middle.

[0033] Figure 6 for Figure 3 Middle BB section view.

[0034] Figure 7 for Figure 3 CC section view.

[0035] Figure 8 This is a schematic diagram of the pressure sensor installation. DETAILED DESCRIPTION

[0036] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0037] Embodiment 1:

[0038] like Figures 1 to 3 As shown, this embodiment provides a wind turbine sliding yaw system test platform, including a main support seat 1, a center support 2, a yaw simulation device 3, an axial loading device 4, a radial loading device 5, a driving device 6 and a control device 7. The yaw simulation device is fixed on the center support 2 to support the yaw simulation device. The center support 2 is fixed on the main support seat 1. The main support seat 1 is the base of the entire test platform and provides support for the installation of the loading device. The outer side of the yaw simulation device 3 is evenly distributed along the circumference with a plurality of axial loading devices 4. This embodiment takes 4 as an example. The axial loading devices 4 and the control device 7 are connected to each other. The driving device 6 is electrically connected, and the driving device 6 drives the axial loading device to load axial force on the yaw simulation device. A radial loading device 5 is arranged outside the yaw simulation device and between any two adjacent axial loading devices. The radial loading device 5 is electrically connected to the driving device 6, and the driving device 6 drives the radial loading device to load radial force on the yaw simulation device. The control device 7 is electrically connected to the yaw simulation device, the axial loading device, the radial loading device and the driving device 6, and the control device 7 electrically controls the yaw simulation device, the axial loading device, the radial loading device and the driving device 6.

[0039] like Figures 4 to 5As shown, the yaw simulation device 3 includes an upper yaw brake 301 to be tested, a lower yaw brake 302 to be tested, a yaw gear ring 303, a yaw brake disc 304, a yaw drive 305, a yaw bracket 306 and a gear ring support ring 307. The upper yaw brake 301 to be tested and the lower yaw brake 302 to be tested are arranged symmetrically up and down, and the lower yaw brake 302 to be tested is fixed to the top of the central bracket 2. The upper yaw brake 301 to be tested and the lower yaw brake 302 to be tested are arranged symmetrically up and down. 01 is fixed to the bottom of the yaw bracket 306, the yaw gear ring 303 is arranged on the outer side of the upper yaw brake 301 to be tested, the yaw brake disc 304 is arranged on the outer side of the lower yaw brake 302 to be tested, and the yaw gear ring 303 is clamped by the first upper friction plate 3011, the first lower friction plate 3012 and the first side friction plate 3013 of the upper yaw brake 301 to be tested, and the first upper friction plate 3011 is installed on the yaw bracket by bolts The bottom surface of the central bracket 306 is provided, the first lower friction plate 3012 and the first side friction plate 3013 are installed on the bottom surface and the side surface of the upper yaw brake 301 to be tested by bolts, the yaw brake disc 304 is clamped by the second upper friction plate 3021, the second lower friction plate 3022 and the second side friction plate 3023 of the lower yaw brake 302 to be tested, the second lower friction plate 3022 is installed on the top surface of the central bracket 2 by bolts, the second upper friction plate 3021 and the second side friction plate 3023 are installed on the top surface and the side surface of the lower yaw brake 302 to be tested by bolts, the yaw ring gear 303 and the yaw brake disc 304 are connected by a ring gear support ring 307, a plurality of yaw drives 305 are evenly distributed on the yaw bracket 306 along the circumference, and the output gears of the plurality of yaw drives 305 are meshed with the yaw ring gear 303, and the yaw ring gear 303 and the yaw brake disc 304 are driven to rotate by the yaw drive 305.

[0040] like Figure 6 As shown, the axial loading device includes an axial loading hydraulic cylinder 401, a first connecting shaft 402, a support pad 403, an axial loading support frame 404, a bottom support seat 405, a top support seat 406 and a tension and compression tester 407. The top of the axial loading hydraulic cylinder 401 is connected to one end of the first connecting shaft 402 through the top support seat 406, and the bottom of the axial loading hydraulic cylinder 401 is connected to the main support seat 1 through the bottom support seat 405. The first connecting shaft 402 is supported on the axial loading support frame 404 through the support pad 403, and the other end thereof is connected to the yaw bracket 306. The axial loading support frame 404 is fixed on the main support seat 1. The axial loading support frame 404 limits the movement of the first connecting shaft 402 in the radial direction of the yaw simulation device, and enables the first connecting shaft 402 to move in the axial direction of the yaw simulation device. A tension and compression tester 407 for detecting the size of the loading force is arranged on the axial loading hydraulic cylinder 401, and the size of the loading force is controlled by controlling the pressure of the axial loading hydraulic cylinder 401.

[0041] like Figure 7 As shown, the radial loading device includes a radial loading hydraulic cylinder 501, a radial hydraulic cylinder support 502, a radial loading support frame 503, a second connecting shaft 504, a double roller support head 505 and a tension and compression tester (not shown in the figure). The radial loading hydraulic cylinder 501 is supported on the main support seat 1 through the radial hydraulic cylinder support 502, and the radial loading hydraulic cylinder 501 is connected to one end of the second connecting shaft 504. The second connecting shaft 504 is supported on the radial loading support frame 503, and the other end thereof is connected to the outer wall of the ring gear support ring 307 through the double roller support head 505. The radial force is transmitted through the double roller support head 505 without restricting the movement of the yaw ring gear 303 and the yaw brake disc 304 in the torsional direction. A tension and compression tester for detecting the size of the loading force is arranged on the radial loading hydraulic cylinder 501, and the size of the loading force is controlled by controlling the pressure of the radial loading hydraulic cylinder 501.

[0042] A torque meter (not shown in the figure) is arranged on the output gear shaft of the yaw drive 305 to detect the output torque of the yaw drive 305 , so as to realize the forward and reverse efficiency test of the yaw drive 305 .

[0043] like Figure 8 As shown, a first lower pressure sensor 3016 and a first side pressure sensor 3015 for detecting the pressure of the corresponding friction plates are respectively arranged inside the upper yaw brake 301 to be tested and located near the first lower friction plate 3013 and the first side friction plate 3012, a first upper pressure sensor 3014 for detecting the pressure of the corresponding friction plates is arranged inside the yaw bracket 306 and located near the first upper friction plate 3011, and the three sensors are respectively electrically connected to the control device; a second upper pressure sensor and a second side pressure sensor for detecting the pressure of the corresponding friction plates are respectively arranged inside the lower yaw brake to be tested and located near the second upper friction plate and the second side friction plate, a second lower pressure sensor for detecting the pressure of the corresponding friction plates is arranged inside the center bracket and located near the second lower friction plate, and the three sensors are respectively electrically connected to the control device.

[0044] Embodiment 2:

[0045] This embodiment provides a wind turbine sliding yaw system test method, which is implemented based on the wind turbine sliding yaw system test platform of embodiment 1, and includes the following steps:

[0046] S1. Install the upper layer yaw brake to be tested and the lower layer yaw brake to be tested in the yaw simulation device, test the resistance of the yaw simulation device under no-load state, and calibrate the yaw simulation device;

[0047] S2, controlling the driving device through the control device to drive the axial loading device to load thrust to the yaw simulation device, ensuring that the thrusts of the four axial loading hydraulic cylinders are equal, so that the first lower friction plate and the second lower friction plate are respectively fitted with the yaw gear ring and the yaw brake disc, starting the yaw drive to rotate the yaw gear ring and the yaw brake disc, and calculating the friction coefficients of the two lower friction plates according to the output torque of the yaw drive and the pressures of the first lower friction plate and the second lower friction plate;

[0048] S3, controlling the driving device through the control device to drive the axial loading device to load tension on the yaw simulation device, ensuring that the tension of the four axial loading hydraulic cylinders is equal, so that the first upper friction plate and the second upper friction plate are respectively fitted with the yaw gear ring and the yaw brake disc, starting the yaw drive to rotate the yaw gear ring and the yaw brake disc, and calculating the friction coefficients of the two upper friction plates according to the output torque of the yaw drive and the pressures of the first upper friction plate and the second upper friction plate;

[0049] S4. Control the driving device through the control device to drive the radial loading device to load thrust to the yaw simulation device, so that the first side friction plate and the second side friction plate are respectively fitted with the yaw gear ring and the yaw brake disc, start the yaw drive to rotate the yaw gear ring and the yaw brake disc, and calculate the friction coefficients of the two side friction plates according to the output torque of the yaw drive and the pressures of the first side friction plate and the second side friction plate.

[0050] This embodiment can also measure the output power of the yaw motor of the yaw drive, and then calculate the yaw drive efficiency according to the output power of the yaw motor and the output torque and rotation speed of the yaw drive.

[0051] The control device controls the driving device to drive two axial loading devices separated by 180° to load thrust and tension to the yaw simulation device respectively, ensuring that the thrust and tension are equal, simulating the yaw bending moment loading, starting the yaw drive to rotate the yaw gear ring and yaw brake disc, and then calculating the uneven load coefficient of the friction plate according to the pressure of each friction plate.

[0052] The above is only a preferred embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical solution and invention concept of the present invention within the scope disclosed by the present invention, which shall fall within the protection scope of the present invention.

Claims

1. A wind turbine sliding yaw system test platform, characterized by: The invention comprises a main support seat, a central support, a yaw simulation device, an axial loading device, a radial loading device, a driving device and a control device, wherein the yaw simulation device is fixed on the central support, and the central support is fixed on the main support seat. A plurality of axial loading devices are evenly distributed along the circumference on the outer side of the yaw simulation device, and the axial loading device is electrically connected to the driving device, and the driving device drives the axial loading device to load axial force on the yaw simulation device. A radial loading device is arranged on the outer side of the yaw simulation device and between any two adjacent axial loading devices, and the radial loading device is electrically connected to the driving device, and the driving device drives the radial loading device to load radial force on the yaw simulation device. The control device is electrically connected to the yaw simulation device, the axial loading device, the radial loading device and the driving device, and the control device electrically controls the yaw simulation device, the axial loading device, the radial loading device and the driving device. The yaw simulation device comprises an upper yaw brake to be tested, a lower yaw brake to be tested, and a lower yaw brake to be tested. The yaw brake to be tested on the upper layer and the yaw brake to be tested on the lower layer are arranged symmetrically, and the yaw brake to be tested on the lower layer is fixed to the top of the central bracket, and the yaw brake to be tested on the upper layer is fixed to the bottom of the yaw bracket. The yaw gear ring is arranged on the outer side of the yaw brake to be tested on the upper layer, and the yaw brake disc is arranged on the outer side of the yaw brake to be tested on the lower layer, and the yaw gear ring is arranged on the outer side of the yaw brake to be tested on the lower layer. The ring is clamped by the first upper friction plate, the first lower friction plate and the first side friction plate of the upper yaw brake to be tested, the yaw brake disc is clamped by the second upper friction plate, the second lower friction plate and the second side friction plate of the lower yaw brake to be tested, the yaw gear ring and the yaw brake disc are connected by a gear ring support ring, a plurality of yaw drives are evenly distributed on the yaw bracket along the circumference, and a plurality of yaw drive output gears are meshed with the yaw gear ring, and the yaw gear ring and the yaw brake disc are driven to rotate by the yaw drive.

2. The wind turbine sliding yaw system test platform according to claim 1, characterized in that: The axial loading device includes an axial loading hydraulic cylinder, a first connecting shaft, a support pad, an axial loading support frame, a bottom support seat, a top support seat and a tension and compression tester. The top of the axial loading hydraulic cylinder is connected to one end of the first connecting shaft through the top support seat, and the bottom of the axial loading hydraulic cylinder is connected to the main support seat through the bottom support seat. The first connecting shaft is supported on the axial loading support frame through the support pad, and the other end thereof is connected to the yaw support. The axial loading support frame is fixed on the main support seat. The movement of the first connecting shaft in the radial direction of the yaw simulation device is limited by the axial loading support frame, and the first connecting shaft can move in the axial direction of the yaw simulation device. The axial loading hydraulic cylinder is provided with a tension and compression tester for detecting the size of the loading force, and the size of the loading force is controlled by controlling the pressure of the axial loading hydraulic cylinder.

3. The wind turbine sliding yaw system test platform according to claim 1, characterized in that: The radial loading device includes a radial loading hydraulic cylinder, a radial hydraulic cylinder support, a radial loading support frame, a second connecting shaft, a double roller support head and a tension and compression tester. The radial loading hydraulic cylinder is supported on the main support seat through the radial hydraulic cylinder support, and the radial loading hydraulic cylinder is connected to one end of the second connecting shaft. The second connecting shaft is supported on the radial loading support frame, and the other end thereof is connected to the outer wall of the gear ring support ring through the double roller support head. The radial loading hydraulic cylinder is provided with a tension and compression tester for detecting the size of the loading force, and the size of the loading force is controlled by controlling the pressure of the radial loading hydraulic cylinder.

4. The wind turbine sliding yaw system test platform according to claim 1, characterized in that: The output gear shaft of the yaw drive is provided with a torque meter for detecting the magnitude of the yaw drive output torque.

5. The wind turbine sliding yaw system test platform according to claim 1, characterized in that: The first upper friction plate is installed on the bottom surface of the yaw bracket by bolts, the first lower friction plate and the first side friction plate are installed on the bottom surface and the side surface of the upper yaw brake to be tested by bolts, the second lower friction plate is installed on the top surface of the center bracket by bolts, and the second upper friction plate and the second side friction plate are installed on the top surface and the side surface of the lower yaw brake to be tested by bolts.

6. The wind turbine sliding yaw system test platform according to claim 5, characterized in that: A first lower pressure sensor and a first side pressure sensor for detecting the pressure of the corresponding friction plates are respectively arranged inside the upper yaw brake to be tested and located near the first lower friction plate and the first side friction plate; a first upper pressure sensor for detecting the pressure of the corresponding friction plates is arranged inside the yaw bracket and located near the first upper friction plate; a second upper pressure sensor and a second side pressure sensor for detecting the pressure of the corresponding friction plates are respectively arranged inside the lower yaw brake to be tested and located near the second upper friction plate and the second side friction plate; a second lower pressure sensor for detecting the pressure of the corresponding friction plate is arranged inside the center bracket and located near the second lower friction plate.

7. The wind turbine sliding yaw system test platform according to claim 1, characterized in that: There are four axial loading devices.

8. A method for testing a sliding yaw system of a wind turbine generator, implemented based on the wind turbine sliding yaw system testing platform according to claims 1 to 7, characterized in that: Including steps, S1. Test the resistance of the yaw simulation device under no-load condition and calibrate the yaw simulation device; S2, controlling the driving device through the control device to drive the axial loading device to load thrust to the yaw simulation device, so that the first lower friction plate and the second lower friction plate are respectively fitted with the yaw gear ring and the yaw brake disc, starting the yaw drive to rotate the yaw gear ring and the yaw brake disc, and calculating the friction coefficients of the two lower friction plates according to the output torque of the yaw drive and the pressures of the first lower friction plate and the second lower friction plate; S3, controlling the driving device through the control device to drive the axial loading device to load a tensile force on the yaw simulation device, so that the first upper friction plate and the second upper friction plate are respectively fitted with the yaw gear ring and the yaw brake disc, starting the yaw drive to rotate the yaw gear ring and the yaw brake disc, and calculating the friction coefficients of the two upper friction plates according to the output torque of the yaw drive and the pressures of the first upper friction plate and the second upper friction plate; S4. Control the driving device through the control device to drive the radial loading device to load thrust to the yaw simulation device, so that the first side friction plate and the second side friction plate are respectively fitted with the yaw gear ring and the yaw brake disc, start the yaw drive to rotate the yaw gear ring and the yaw brake disc, and calculate the friction coefficients of the two side friction plates according to the output torque of the yaw drive and the pressures of the first side friction plate and the second side friction plate.

9. The wind turbine sliding yaw system testing method according to claim 8, characterized in that: The output power of the yaw motor of the yaw drive is measured, and then the yaw drive efficiency is calculated based on the output power of the yaw motor and the output torque and speed of the yaw drive.

10. The wind turbine sliding yaw system testing method according to claim 8, characterized in that: The control device controls the driving device to drive two axial loading devices separated by 180° to load thrust and tension to the yaw simulation device respectively, simulating yaw bending moment loading, and starting the yaw drive to rotate the yaw gear ring and yaw brake disc, and then calculate the uneven load coefficient of the friction plate according to the pressure of each friction plate.

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