A test platform and test method for a wind turbine sliding yaw system

Abstract

The application discloses a kind of wind-driven generator sliding yaw system test platform and test method, including main support seat, center support, yaw simulation device, axial loading device, radial loading device, driving device and control device, the yaw simulation device is fixed on center support, the center support is fixed on main support seat, the outside of the yaw simulation device is evenly distributed with multiple axial loading devices along circumference, the axial loading device is electrically connected with driving device, the outside of the yaw simulation device and between any two adjacent axial loading devices is arranged radial loading device, the radial loading device is electrically connected with driving device, the control device is electrically connected with yaw simulation device, axial loading device, radial loading device and driving device.The application has the advantages of simple structure, low cost, accurate and efficient test data, etc., by obtaining the measured value of yaw system component characteristic parameter, improve the reliability of sliding yaw system design.

Description

Technical Field

[0001] This invention relates to the technical field of wind power generation, and in particular to a test platform and test method for a wind turbine sliding yaw system. Background Technology

[0002] For wind turbines employing a slip yaw system, the characteristic parameters of the yaw drive and yaw brake friction pads have a significant and direct impact on the simulation calculation results of the yaw system during its design. 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, it will seriously affect the safety of the wind turbine. Therefore, it is essential to establish a slip yaw system testing device to obtain measured values ​​of the yaw component characteristic parameters, thereby ensuring the reliability of the yaw system design.

[0003] There are two main types of conventional sliding yaw system testing devices. One type involves testing the wind turbine generator online by attaching strain gauges, adding sensors, and deploying data acquisition equipment. Since the external load is provided by the wind load, it is difficult to accurately measure the relationship between the load and force on the yaw system. The other type involves directly moving the entire yaw system components of the wind turbine generator to the test site for testing. Usually, only the driving torque can be applied. If the external load on the yaw system is to be applied, significant modifications need to be made to the components of the entire generator. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide a test platform for a wind turbine slip yaw system. It has the advantages of simple structure, low cost, and accurate and efficient test data. By obtaining the measured values ​​of the characteristic parameters of the yaw system components, the reliability of the slip yaw system design is improved.

[0005] Another objective of this invention is to provide a test method for a wind turbine sliding yaw system.

[0006] The objective of this invention is achieved through the following technical solution:

[0007] A test platform for a wind turbine sliding yaw system includes a main support, a central support, a yaw simulation device, an axial loading device, a radial loading device, a drive device, and a control device. The yaw simulation device is fixed to the central support, which is fixed to the main support. Multiple axial loading devices are evenly distributed around the circumference of the yaw simulation device. Each axial loading device is electrically connected to the drive device, which drives the axial loading devices to apply axial force to the yaw simulation device. Radial loading devices are arranged around the yaw simulation device, between any two adjacent axial loading devices. Each radial loading device is electrically connected to the drive device, which drives the radial loading devices to apply radial force to the yaw simulation device. The control device is electrically connected to the yaw simulation device, the axial loading devices, the radial loading devices, and the drive device, and provides electrical control over these components. The yaw simulation device includes an upper layer... The system includes a yaw brake under test, a lower yaw brake under test, a yaw gear ring, a yaw brake disc, a yaw drive, a yaw bracket, and a gear ring support ring. The upper and lower yaw brakes under test are arranged symmetrically, with the lower yaw brake fixed to the top of the central bracket and the upper yaw brake fixed to the bottom of the yaw bracket. The yaw gear ring is located on the outside of the upper yaw brake under test, and the yaw brake disc is located on the outside of the lower yaw brake under test. 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 under test. 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 under test. The yaw gear ring and the yaw brake disc are connected by a gear ring support ring. Multiple yaw drives are evenly distributed on the yaw bracket along the circumference, and the output gears of the multiple yaw drives mesh with the yaw gear ring. The yaw drives drive the yaw gear ring and the yaw brake disc to rotate.

[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 / compression tester. The top of the axial loading hydraulic cylinder is connected to one end of the first connecting shaft via the top support seat, and the bottom of the axial loading hydraulic cylinder is connected to the main support seat via the bottom support seat. The first connecting shaft is supported on the axial loading support frame via the support pad, and its other end is connected to the yaw bracket. The axial loading support frame is fixed on the main support seat. The axial loading support frame restricts the movement of the first connecting shaft in the radial direction of the yaw simulation device and allows the first connecting shaft to move in the axial direction of the yaw simulation device. The axial loading hydraulic cylinder is equipped with a tension / compression tester for detecting the magnitude of the loading force. 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 / compression tester. The radial loading hydraulic cylinder is supported on the main support seat by the radial hydraulic cylinder support, and one end of the radial loading hydraulic cylinder is connected to the second connecting shaft. The second connecting shaft is supported on the radial loading support frame, and its other end is connected to the outer wall of the gear ring support ring through the double roller support head. The radial loading hydraulic cylinder is equipped with a tension / compression tester for detecting the magnitude of the loading force. The magnitude of the loading force is controlled by controlling the pressure of the radial loading hydraulic cylinder.

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

[0011] Furthermore, the first upper friction plate is bolted to the bottom surface of the yaw bracket, the first lower friction plate and the first side friction plate are bolted to the bottom and side surfaces of the upper yaw brake to be tested, the second lower friction plate is bolted to the top surface of the central bracket, and the second upper friction plate and the second side friction plate are bolted to the top and side surfaces of the lower yaw brake to be tested.

[0012] Furthermore, the upper yaw brake under test is equipped with a first lower pressure sensor and a first side pressure sensor for detecting the pressure of the corresponding friction plates, respectively, located inside the upper yaw brake and near the first lower friction plate and the first side friction plate. The yaw bracket is equipped with a first upper pressure sensor for detecting the pressure of the corresponding friction plate, located inside the lower yaw brake under test and near the second upper friction plate and the second side friction plate. The central bracket is equipped with a second lower pressure sensor for detecting the pressure of the corresponding friction plate, located inside the central bracket and near the second lower friction plate.

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

[0014] Another objective of this invention is achieved through the following technical solution:

[0015] A test method for a wind turbine skid yaw system, implemented based on the aforementioned wind turbine skid yaw system test platform, includes the following steps:

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

[0017] S2. Control the drive device through the control device to drive the axial loading device to apply thrust to the yaw simulation device so that the first lower friction plate and the second lower friction plate are in contact with the yaw gear ring and the yaw brake disc respectively. Start the yaw drive to make the yaw gear ring and the yaw brake disc rotate. Calculate the friction coefficient of the two lower friction plates according to the output torque of the yaw drive and the pressure of the first lower friction plate and the second lower friction plate respectively.

[0018] S3. Control the drive device through the control device to drive the axial loading device to apply tension to the yaw simulation device so that the first upper friction plate and the second upper friction plate are in contact with the yaw gear ring and the yaw brake disc respectively. Start the yaw drive to make the yaw gear ring and the yaw brake disc rotate. Calculate the friction coefficient of the two upper friction plates according to the output torque of the yaw drive and the pressure of the first upper friction plate and the second upper friction plate respectively.

[0019] S4. Control the drive device through the control device to drive the radial loading device to apply thrust to the yaw simulation device so that the first side friction plate and the second side friction plate are in contact with the yaw gear ring and the yaw brake disc respectively. Start the yaw drive to make the yaw gear ring and the yaw brake disc rotate. Calculate the friction coefficient of the two side friction plates according to the output torque of the yaw drive and the pressure of the first side friction plate and the second side friction plate respectively.

[0020] Furthermore, 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, the output torque and speed of the yaw drive.

[0021] Furthermore, the control device controls the drive device to drive two axial loading devices 180° apart to apply thrust and tension to the yaw simulation device respectively, simulating yaw bending moment loading. The yaw drive is then started to rotate the yaw gear ring and yaw brake disc. Then, the uneven load coefficient of the friction plates is calculated based on 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 a fixed yaw drive and yaw brake, and a rotating yaw gear ring and yaw brake disc, which greatly simplifies the overall structure of the test platform. While meeting the test requirements of key characteristic parameters, it significantly reduces the cost of the test platform and makes the operation of the test platform simpler.

[0024] 2. In this invention, the yaw brake is arranged back to back in two layers, which can achieve equal force on the friction pads on the two brakes when a single axial force is applied, thereby making the measurement of the friction coefficient of the friction pads more accurate.

[0025] 3. In this invention, the radial loading hydraulic cylinder uses a double roller contact head to contact the gear ring support ring to achieve radial force transmission. Radial force loading can be performed without affecting the torque transmission of the yaw simulation device. The structure is simple and the operation is convenient.

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

[0027] 5. This invention uses four external hydraulic cylinders to apply axial force. The magnitude of the applied axial force can be directly controlled by controlling the pressure of the hydraulic cylinders. Alternatively, different pressures can be applied to the four hydraulic cylinders to simulate torque loading. The loading device has a simple structure and is easy to operate. Attached Figure Description

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

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

[0030] Figure 3 This is a top view of the test platform for the sliding yaw system.

[0031] Figure 4 for Figure 3 Sectional view along the AA direction.

[0032] Figure 5 for Figure 4 Enlarged view of a section at point D.

[0033] Figure 6 for Figure 3 Sectional view along the BB direction.

[0034] Figure 7 for Figure 3 Sectional view along the CC direction.

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

[0036] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, 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 some embodiments of the present invention, but not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0037] Example 1:

[0038] like Figures 1 to 3 As shown, this embodiment provides a test platform for a wind turbine sliding yaw system, including a main support base 1, a central support 2, a yaw simulation device 3, an axial loading device 4, a radial loading device 5, a drive device 6, and a control device 7. The yaw simulation device is fixed on the central support 2, which supports the yaw simulation device. The central support 2 is fixed on the main support base 1, which is the base of the entire test platform and provides support for the installation of the loading devices. Multiple axial loading devices 4 are evenly distributed along the circumference of the outer side of the yaw simulation device 3. This embodiment takes four as an example. The axial loading devices 4 and The drive unit 6 is electrically connected and drives the axial loading device to apply axial force to 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 drive unit 6 and drives the radial loading device to apply radial force to the yaw simulation device. The control unit 7 is electrically connected to the yaw simulation device, the axial loading device, the radial loading device, and the drive unit 6 and performs electrical control on the yaw simulation device, the axial loading device, the radial loading device, and the drive unit 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 and the lower yaw brake 302 to be tested are arranged symmetrically, and the lower yaw brake 302 to be tested is fixed to the top of the central bracket 2. 01 is fixed to the bottom of the yaw bracket 306. The yaw gear ring 303 is disposed on the outside of the upper yaw brake 301 to be tested, and the yaw brake disc 304 is disposed on the outside of the lower yaw brake 302 to be tested. 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. The first upper friction plate 3011 is installed on the yaw bracket by bolts. On the bottom surface of 306, the first lower friction plate 3012 and the first side friction plate 3013 are bolted to the bottom and side surfaces of the upper yaw brake 301 to be tested. 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 bolted to the top surface of the central support 2. The second upper friction plate 3021 and the second side friction plate 3023 are bolted to the top and side surfaces of the lower yaw brake 302 to be tested. The yaw gear ring 303 and the yaw brake disc 304 are connected by a gear ring support ring 307. Multiple yaw drives 305 are evenly distributed around the circumference on the yaw support 306, and the output gears of the multiple yaw drives 305 mesh with the yaw gear ring 303. The yaw drives 305 drive the yaw gear ring 303 and the yaw brake disc 304 to rotate.

[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 / 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 its other end 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 restricts the movement of the first connecting shaft 402 in the radial direction of the yaw simulation device and allows the first connecting shaft 402 to move in the axial direction of the yaw simulation device. The axial loading hydraulic cylinder 401 is equipped with a tension / compression tester 407 for detecting the magnitude of the loading force. The magnitude 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 / compression tester (not shown in the figure). The radial loading hydraulic cylinder 501 is supported on the main support seat 1 by the radial hydraulic cylinder support 502, and one end of the radial loading hydraulic cylinder 501 is connected to the second connecting shaft 504. The second connecting shaft 504 is supported on the radial loading support frame 503, and its other end is connected to the outer wall of the gear ring 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 gear ring 303 and the yaw brake disc 304 in the torsional direction. A tension / compression tester for detecting the magnitude of the loading force is provided on the radial loading hydraulic cylinder 501. The magnitude 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 installed on the output gear shaft of the yaw drive 305 to detect the output torque of the yaw drive 305, and can realize the forward and reverse efficiency test of the yaw drive 305.

[0043] like Figure 8 As shown, the upper yaw brake 301 under test has a first lower pressure sensor 3016 and a first side pressure sensor 3015 installed inside the upper yaw brake 301, near the first lower friction plate 3013 and the first side friction plate 3012, respectively, for detecting the pressure of the corresponding friction plates. The yaw bracket 306 has a first upper pressure sensor 3014 installed inside the yaw brake 306, near the first upper friction plate 3011, for detecting the pressure of the corresponding friction plate. The three sensors are electrically connected to the control device. The lower yaw brake under test has a second upper pressure sensor and a second side pressure sensor installed inside the lower yaw brake 301, near the second upper friction plate and the second side friction plate, respectively, for detecting the pressure of the corresponding friction plates. The central bracket has a second lower pressure sensor installed inside the central bracket, near the second lower friction plate, for detecting the pressure of the corresponding friction plate. The three sensors are electrically connected to the control device.

[0044] Example 2:

[0045] This embodiment provides a test method for a wind turbine skid yaw system, implemented based on the wind turbine skid yaw system test platform of Embodiment 1, including the following steps:

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

[0047] S2. Control the drive device through the control device to drive the axial loading device to apply thrust to the yaw simulation device, ensuring that the thrust of the four axial loading hydraulic cylinders is equal, so that the first lower friction plate and the second lower friction plate are in contact with the yaw gear ring and the yaw brake disc respectively. Start the yaw drive to make the yaw gear ring and the yaw brake disc rotate. Calculate the friction coefficient of the two lower friction plates according to the output torque of the yaw drive and the pressure of the first lower friction plate and the second lower friction plate respectively.

[0048] S3. Control the drive device through the control device to drive the axial loading device to apply tension to 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 in contact with the yaw gear ring and the yaw brake disc respectively. Start the yaw drive to make the yaw gear ring and the yaw brake disc rotate. Calculate the friction coefficient of the two upper friction plates according to the output torque of the yaw drive and the pressure of the first upper friction plate and the second upper friction plate respectively.

[0049] S4. Control the drive device through the control device to drive the radial loading device to apply thrust to the yaw simulation device so that the first side friction plate and the second side friction plate are in contact with the yaw gear ring and the yaw brake disc respectively. Start the yaw drive to make the yaw gear ring and the yaw brake disc rotate. Calculate the friction coefficient of the two side friction plates according to the output torque of the yaw drive and the pressure of the first side friction plate and the second side friction plate respectively.

[0050] This embodiment can also calculate the yaw drive efficiency by measuring the output power of the yaw motor of the yaw drive and then calculating the output power of the yaw motor, as well as the output torque and speed of the yaw drive.

[0051] The control device controls the drive device to drive two axial loading devices 180° apart to apply thrust and tension to the yaw simulation device respectively, ensuring that the thrust and tension are equal, simulating 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 plates according to the pressure of each friction plate.

[0052] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope disclosed in the present invention, based on the technical solution and inventive concept of the present invention, shall fall within the scope of protection of the present invention.

Claims

1. A test platform for a wind turbine slip yaw system, characterized in that: The system includes a main support, a central support, a yaw simulation device, an axial loading device, a radial loading device, a drive device, and a control device. The yaw simulation device is fixed to the central support, which in turn is fixed to the main support. Multiple axial loading devices are evenly distributed around the circumference of the yaw simulation device. Each axial loading device includes an axial loading hydraulic cylinder, a first connecting shaft, a support pad, an axial loading support frame, a bottom support, a top support, and a tension / compression tester. The top of the axial loading hydraulic cylinder is connected to one end of the first connecting shaft via the top support, and the bottom of the axial loading hydraulic cylinder is connected to the main support via the bottom support. The first connecting shaft is supported by the support pad. An axial loading support frame is mounted on the axial loading support frame, with its other end connected to the yaw support. The axial loading support frame is fixed to the main support base. The axial loading support frame restricts the movement of the first connecting shaft in the radial direction of the yaw simulation device, while allowing the first connecting shaft to move in the axial direction of the yaw simulation device. A tension / compression tester for detecting the magnitude of the loading force is installed on the axial loading hydraulic cylinder. The loading force is controlled by controlling the pressure of the axial loading hydraulic cylinder. The axial loading device is electrically connected to the drive device, which drives the axial loading device to apply axial force to the yaw simulation device. A radial loading device is arranged on the outside of the yaw simulation device and between any two adjacent axial loading devices. The radial loading device is electrically connected to the drive device, which drives the radial loading device to apply radial force to the yaw simulation device. The control device is electrically connected to the yaw simulation device, axial loading device, radial loading device, and drive device, and provides electrical control over these components. The yaw simulation device includes an upper yaw brake under test, a lower yaw brake under test, a yaw gear ring, a yaw brake disc, a yaw drive, a yaw bracket, and a gear ring support ring. The upper and lower yaw brakes under test are arranged symmetrically, and the lower yaw brake under test is fixed to the top of the central bracket. The upper yaw brake under test is fixed to the bottom of the yaw bracket. The yaw gear ring is located on the outside of the upper yaw brake under test, and the yaw brake disc is located on the outside of the lower yaw brake under test. 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 under test. 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 under test. The yaw gear ring and the yaw brake disc are connected by a gear ring support ring. Multiple yaw drives are evenly distributed around the yaw bracket, and the output gears of the multiple yaw drives mesh with the yaw gear ring, driving the yaw gear ring and the yaw brake disc to rotate.

2. The wind turbine slip 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 / compression tester. The radial loading hydraulic cylinder is supported on the main support seat by the radial hydraulic cylinder support, and one end of the radial loading hydraulic cylinder is connected to the second connecting shaft. The second connecting shaft is supported on the radial loading support frame, and its other end is connected to the outer wall of the gear ring support ring through the double roller support head. The radial loading hydraulic cylinder is equipped with a tension / compression tester for detecting the magnitude of the loading force. The magnitude of the loading force is controlled by controlling the pressure of the radial loading hydraulic cylinder.

3. The wind turbine slip yaw system test platform according to claim 1, characterized in that: A torque meter is installed on the output gear shaft of the yaw drive to detect the magnitude of the yaw drive output torque.

4. The wind turbine slip yaw system test platform according to claim 1, characterized in that: The first upper friction plate is bolted to the bottom surface of the yaw bracket, the first lower friction plate and the first side friction plate are bolted to the bottom and side surfaces of the upper yaw brake to be tested, the second lower friction plate is bolted to the top surface of the central bracket, and the second upper friction plate and the second side friction plate are bolted to the top and side surfaces of the lower yaw brake to be tested.

5. The wind turbine slip yaw system test platform according to claim 4, characterized in that: The upper-layer yaw brake under test has a first lower pressure sensor and a first side pressure sensor installed inside it, near the first lower friction plate and the first side friction plate, respectively, for detecting the pressure of the corresponding friction plates. The yaw bracket has a first upper pressure sensor installed inside it, near the first upper friction plate, for detecting the pressure of the corresponding friction plate. The lower-layer yaw brake under test has a second upper pressure sensor and a second side pressure sensor installed inside it, near the second upper friction plate and the second side friction plate, respectively, for detecting the pressure of the corresponding friction plates. The central bracket has a second lower pressure sensor installed inside it, near the second lower friction plate, for detecting the pressure of the corresponding friction plate.

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

7. A test method for a wind turbine skid yaw system, implemented based on the wind turbine skid yaw system test platform according to any one of claims 1 to 6, characterized in that, Including steps, S1. Test the resistance of the yaw simulation device under no-load conditions and calibrate the yaw simulation device. S2. Control the drive device through the control device to drive the axial loading device to apply thrust to the yaw simulation device so that the first lower friction plate and the second lower friction plate are in contact with the yaw gear ring and the yaw brake disc respectively. Start the yaw drive to make the yaw gear ring and the yaw brake disc rotate. Calculate the friction coefficient of the two lower friction plates according to the output torque of the yaw drive and the pressure of the first lower friction plate and the second lower friction plate respectively. S3. Control the drive device through the control device to drive the axial loading device to apply tension to the yaw simulation device so that the first upper friction plate and the second upper friction plate are in contact with the yaw gear ring and the yaw brake disc respectively. Start the yaw drive to make the yaw gear ring and the yaw brake disc rotate. Calculate the friction coefficient of the two upper friction plates according to the output torque of the yaw drive and the pressure of the first upper friction plate and the second upper friction plate respectively. S4. Control the drive device through the control device to drive the radial loading device to apply thrust to the yaw simulation device so that the first side friction plate and the second side friction plate are in contact with the yaw gear ring and the yaw brake disc respectively. Start the yaw drive to make the yaw gear ring and the yaw brake disc rotate. Calculate the friction coefficient of the two side friction plates according to the output torque of the yaw drive and the pressure of the first side friction plate and the second side friction plate respectively.

8. The test method for a wind turbine slip yaw system according to claim 7, 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, the output torque and speed of the yaw drive.

9. The test method for a wind turbine slip yaw system according to claim 7, characterized in that, The control device controls the drive device to drive two axial loading devices 180° apart to apply thrust and tension to the yaw simulation device respectively, simulating yaw bending moment loading. The yaw drive is started to rotate the yaw gear ring and yaw brake disc. Then, the uneven load coefficient of the friction plates is calculated according to the pressure of each friction plate.

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