Wind turbine yaw monitoring system and wind turbine

Abstract

The application provides a yaw monitoring system of a wind turbine generator set and the wind turbine generator set, and belongs to the technical field of wind turbine generator set monitoring. The system comprises: a sensor group arranged on the wind turbine generator set and used for acquiring the lubricating grease temperature value, the caliper vibration value, the tower top stress value and the yaw motor torque value of the wind turbine generator set during yaw; a data transmission device arranged on the wind turbine generator set and in communication connection with the sensor group to realize data transmission; and a server in communication connection with the data transmission device and used for determining the running state of the wind turbine generator set during yaw based on the lubricating grease temperature value, the caliper vibration value, the tower top stress value and the yaw motor torque value of the wind turbine generator set during yaw. The application realizes multi-parameter acquisition, monitors the yaw process of the wind turbine generator set from multiple angles, and ensures safe and reliable operation of the wind turbine generator set.

Description

Technical Field

[0001] This invention relates to the field of wind turbine generator monitoring technology, specifically to a wind turbine generator yaw monitoring system and a wind turbine generator. Background Technology

[0002] The rapid development of larger wind turbine generator sets has increased the weight of the nacelle and the load on the tower top, requiring yaw bearings to withstand greater loads. This places higher demands on the design, manufacturing, and monitoring of yaw bearings during operation. In existing technologies, wind turbine yaw is often achieved using engineering plastic sliding bearings with surface contact at the joints. This structure is simple and has a high load-bearing capacity, eliminating the need for hydraulic devices and brake discs, thus reducing overall cost and avoiding the risk of hydraulic oil leakage. However, during wind turbine operation, multi-sensor information fusion technology is not used to comprehensively monitor the stability of the sliding yaw of large-megawatt units from different angles, posing certain safety hazards. Summary of the Invention

[0003] The purpose of this invention is to provide a yaw monitoring system and a wind turbine generator set, so as to at least solve the problem that, during the operation of a wind turbine generator set, the stability of the actual sliding yaw of a large megawatt unit is not comprehensively monitored from different angles by multi-sensor information fusion technology, which poses certain safety hazards.

[0004] To achieve the above objectives, a first aspect of the present invention provides a yaw monitoring system for a wind turbine generator set, the system comprising:

[0005] The sensor array, installed on the wind turbine generator, is used to acquire the grease temperature, caliper vibration, tower top stress, and yaw motor torque values ​​of the wind turbine generator during the yaw process.

[0006] A data transmission device is installed on the wind turbine generator set and is communicatively connected to the sensor group to realize data transmission.

[0007] The server, which is communicatively connected to the data transmission device, is used to determine the operating status of the wind turbine generator set during the yaw process based on the grease temperature, caliper vibration, tower top stress, and yaw motor torque values ​​of the wind turbine generator set during the yaw process.

[0008] Optionally, the sensor group includes:

[0009] A temperature monitoring device is installed in the grease filling hole of the caliper of the wind turbine generator set to obtain the temperature data of the lubricating grease in the grease filling hole;

[0010] A vibration monitoring device is installed on the caliper of the wind turbine generator set to acquire caliper vibration data.

[0011] The stress monitoring device is installed on the top of the wind turbine tower to acquire the stress data at the top of the tower.

[0012] A torque monitoring device is installed on the yaw motor of a wind turbine generator set to acquire the yaw motor torque data of the wind turbine generator set.

[0013] Optionally, the system further includes:

[0014] The yaw monitoring and control device is connected to the main control system of the wind turbine generator set. The yaw monitoring and control device is used to control the temperature monitoring device, vibration monitoring device, stress monitoring device, torque monitoring device and data transmission device to enter the working state when the main control system sends the yaw start signal of the generator set.

[0015] It is also used to control the temperature monitoring device, vibration monitoring device, stress monitoring device, torque monitoring device and data transmission device to enter a sleep state when the unit yaw end signal is received from the main control system.

[0016] Optionally, the temperature monitoring device is a temperature sensor;

[0017] The vibration monitoring device is a vibration acceleration sensor;

[0018] The stress monitoring device is a strain gauge;

[0019] The torque monitoring device is a torque sensor.

[0020] Optionally, the operating states of the wind turbine generator set include: normal operating state and abnormal operating state;

[0021] The wind turbine generator set is considered to be in normal operating condition if the following conditions are met simultaneously: the grease temperature is not lower than the preset temperature threshold, the caliper vibration value does not exceed the preset vibration threshold, the tower top stress value does not exceed the preset stress threshold, and the yaw motor torque value does not exceed the preset stress threshold.

[0022] Otherwise, the wind turbine generator set is determined to be in an abnormal operating state.

[0023] Optionally, the server is configured to output a first alarm command when the grease temperature is lower than a preset temperature threshold; output a second alarm command when the caliper vibration exceeds a preset vibration threshold; output a third alarm command when the tower top stress exceeds a preset stress threshold; and output a fourth alarm command when the yaw motor torque exceeds a preset stress threshold.

[0024] Optionally, the system further includes:

[0025] The damping adjustment device is installed on the caliper of the wind turbine generator set. It is used to adjust the damping torque between the caliper and the gear ring when the caliper vibration value exceeds the preset vibration threshold, so as to reduce the caliper vibration value to below the preset vibration threshold.

[0026] Optionally, the caliper has a groove; the damping adjustment device includes:

[0027] A lower sliding pad is disposed between the caliper and the gear ring, with one end of the lower sliding pad located within the groove;

[0028] A drive rod is rotatably mounted on the caliper. One end of the drive rod is located in the groove of the caliper and is in contact with the lower sliding pad through a clamping block. By rotating the drive rod, the pressure applied by the clamping block to the lower sliding pad can be adjusted, thereby adjusting the damping torque between the caliper and the gear ring.

[0029] Optionally, the damping adjustment device further includes:

[0030] A drive motor, which is mounted on the caliper, is used to provide rotational driving force to the drive rod;

[0031] The drive motor is communicatively connected to the server, which is also used to generate motor control commands based on the caliper vibration value to adjust the pressure applied by the drive rod to the lower sliding pad.

[0032] A second aspect of the present invention provides a wind turbine generator set equipped with the aforementioned wind turbine generator set yaw monitoring system.

[0033] This technical solution enables the acquisition of multiple parameters during the yaw process of wind turbine generators, including the acquisition of lubricating grease temperature, caliper vibration, tower top stress, and yaw motor torque. It monitors the yaw process of wind turbine generators from multiple angles, providing comprehensive and reliable monitoring that further ensures the safe and stable operation of wind turbine generators.

[0034] Other features and advantages of the embodiments of the present invention will be described in detail in the following detailed description section. Attached Figure Description

[0035] The accompanying drawings are provided to further illustrate embodiments of the present invention and form part of the specification. They are used together with the following detailed description to explain the embodiments of the present invention, but do not constitute a limitation thereof. In the drawings:

[0036] Figure 1 This is a schematic diagram of the structure of the first wind turbine yaw monitoring system provided by the present invention;

[0037] Figure 2 This is a schematic diagram of the structure of the second type of wind turbine yaw monitoring system provided by the present invention;

[0038] Figure 3 This is a schematic diagram of the damping adjustment device and wind turbine generator set provided by the present invention;

[0039] Figure 4 This is a block diagram showing the connection between the damping adjustment device provided by the present invention and the server.

[0040] Explanation of reference numerals in the attached figures

[0041] 1-Sensor group; 2-Data transmission device;

[0042] 3-Server; 4-Damping adjustment device;

[0043] 11-Temperature monitoring device; 12-Vibration monitoring device;

[0044] 13-Stress monitoring device; 14-Torque monitoring device;

[0045] 15 - Yaw monitoring and control device; 41 - Lower sliding pad;

[0046] 42-Drive rod; 43-Clamping block;

[0047] 44 - Drive motor; 51 - Caliper;

[0048] 52-Gear ring; 53-Main frame;

[0049] 54 - First bolt; 55 - Tower top flange;

[0050] 56 - Second bolt; 57 - Upper sliding pad;

[0051] 58 - Side sliding pad; 511 - Groove;

[0052] 512 - Grease filling hole. Detailed Implementation

[0053] The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0054] Figure 1 This is a schematic diagram of the structure of the first wind turbine yaw monitoring system provided by the present invention; Figure 2 This is a schematic diagram of the structure of the second type of wind turbine yaw monitoring system provided by the present invention; Figure 3 This is a schematic diagram of the damping adjustment device and wind turbine generator set provided by the present invention; Figure 4This is a block diagram showing the connection between the damping adjustment device provided by the present invention and the server.

[0055] like Figure 1-2 As shown, an embodiment of the present invention provides a yaw monitoring system for wind turbine generator sets, the system comprising:

[0056] Sensor group 1 is installed on the wind turbine generator set to acquire the grease temperature, caliper vibration, tower top stress, and yaw motor torque values ​​of the yaw system during the yaw process of the wind turbine generator set.

[0057] Specifically, in this embodiment, sensor group 1 includes: a temperature monitoring device 11, installed in the grease fitting hole of the wind turbine generator's caliper, for acquiring grease temperature data within the grease fitting hole; a vibration monitoring device 12, installed on the caliper of the wind turbine generator, for acquiring caliper vibration data; since the sliding bearing simultaneously bears large axial loads, radial loads, and overturning moments, two calipers are selected on the rotor side and the nacelle side, respectively installed in the axial, radial, and tangential directions of the calipers; and a stress monitoring device 13, installed on the top of the wind turbine generator tower, for acquiring normal moment, lateral moment, and torque data at the top of the tower. The torque monitoring device 14 is installed on the yaw motor of the wind turbine generator set to acquire the yaw motor torque data of the wind turbine generator set. More specifically, the temperature monitoring device 11 is a temperature sensor, specifically a PT100 temperature sensor, to acquire the temperature change of the grease in the grease hole throughout the yaw process. The grease temperature data in the grease hole corresponds to the working temperature of the side sliding pad 58. The vibration monitoring device 12 is a vibration acceleration sensor. The stress monitoring device 13 is a strain gauge. The torque monitoring device 14 is a torque sensor.

[0058] Data transmission device 2 is installed on the wind turbine generator set and communicates with the sensor group to connect and realize data transmission;

[0059] Specifically, in this embodiment, data transmission can be achieved through wireless communication modules such as 4G, 5G networks, and wireless routers. The wireless communication module includes a wireless transmitting module and a wireless receiving module that are interconnected. The wireless transmitting module is located inside the nacelle of the wind turbine generator and communicates with sensor group 1 to achieve wireless data transmission; the wireless receiving module is directly located in the monitoring room of the wind farm to achieve communication with server 3. In another embodiment, the wireless receiving module can also be located inside the nacelle of the wind turbine generator. After receiving data, the wind farm ring network enables long-distance data transmission with server 3.

[0060] Server 3 is communicatively connected to the data transmission device 2 and is used to determine the operating status of the wind turbine generator set during the yaw process based on the grease temperature value, caliper vibration value, tower top stress value, and yaw motor torque value of the wind turbine generator set during the yaw process.

[0061] Specifically, server 3 can be set up in the monitoring room of the wind farm, and can store and analyze data to determine the operating status of the wind turbine during the yaw process.

[0062] In another embodiment, the wind turbine yaw monitoring system further includes a display device, which is communicatively connected to the server 3 and can display the grease temperature, caliper vibration, tower top stress, and yaw motor torque values ​​of the wind turbine during the yaw process.

[0063] More specifically, in determining the operating status of the wind turbine generator during the yaw process, server 3 needs to analyze the received data, including:

[0064] Since the torque sensor measures the torque of the yaw motor, it needs to be converted into the actual driving torque using the following formula: The actual driving torque T(t) can be expressed as: T(t) = T motor ·i total ·η total , among which, T motor The yaw motor torque is obtained from a torque sensor and is measured in Nm; total The overall speed ratio is calculated as: gearbox speed ratio × yaw bearing speed ratio; η total The total transmission efficiency is calculated as the gearbox transmission efficiency multiplied by the yaw bearing transmission efficiency.

[0065] Furthermore, the analysis of the collected data can be divided into two parts: short-term verification and long-term verification. Short-term verification analyzes the data collected for each yaw. Vibration data undergoes time-domain and frequency-domain analysis. Key parameters for time-domain analysis include maximum / minimum values, mean values, effective values, and kurtosis. These parameters reflect the characteristics of the data and help determine if impact phenomena occur during yaw. The stress generated by vibration and impact may be far below the structural strength limit under static load, but prolonged exposure to vibration or frequent impacts can lead to fatigue failure during sliding yaw; it can also easily cause vibration faults in wind turbine generators, affecting power generation. Simultaneously, time-domain analysis of tower top load data is performed for cross-verification with vibration data. Frequency-domain vibration analysis converts the time-domain signal to a frequency-domain signal using Fourier transform, calculating the spectral components of the yaw vibration data to determine if resonance occurs during yaw, thus preventing wind turbine generator instability due to resonance. Temperature data is primarily analyzed in the time domain to verify the temperature changes of the side sliding pad during sliding. Over time, environmental factors and other influences complicate the friction between the sliding pad and the gear ring in the slip yaw system, potentially leading to premature wear of the sliding pad or excessive yaw drive load. Long-term validation examines changes in vibration, temperature, and torque test data characteristics throughout the entire testing cycle, checking the stability of the slip yaw system by observing these changes.

[0066] Furthermore, the system also includes:

[0067] Yaw monitoring and control device 15 is connected to the main control system of the wind turbine generator set. The yaw monitoring and control device 15 is used to control the temperature monitoring device 11, vibration monitoring device 12, stress monitoring device 13, torque monitoring device 14 and data transmission device 2 to enter the working state when the main control system sends the yaw start signal of the generator set.

[0068] It is also used to control the temperature monitoring device 11, vibration monitoring device 12, stress monitoring device 13, torque monitoring device 14 and data transmission device 2 to enter a sleep state when the unit yaw end signal is received from the main control system.

[0069] Specifically, the yaw process of a wind turbine includes: a wind sensor transmitting changes in wind direction to the processor in the yaw motor control loop; the processor then determines the yaw direction and angle, ultimately achieving yaw alignment with the wind. To reduce the gyroscopic torque during yaw, the motor speed is reduced via a coaxially connected reducer, and the yaw torque is applied to the large gear of the rotating body, causing the wind turbine to yaw against the wind. Once alignment with the wind is complete, the wind sensor loses its electrical signal, the motor stops operating, and the yaw process ends. Therefore, the main control system of the wind turbine can generate yaw start and yaw end signals based on these signals.

[0070] In this embodiment, the wind turbine generator set adopts a sliding yaw mode. The yaw monitoring system of the wind turbine generator set mainly monitors the yaw process of the wind turbine generator set. Since the wind turbine generator set is not in the yaw process at all times, the temperature monitoring device 11, vibration monitoring device 12, stress monitoring device 13, torque monitoring device 14, and data transmission device 2 would be in a long-term working state, which would lead to component wear and tear and reduce service life. Therefore, a yaw monitoring and control device 15 is set up accordingly. When the yaw monitoring and control device 15 receives the unit yaw start signal sent by the main control system of the wind turbine generator set, it controls the temperature monitoring device 11, vibration monitoring device 12, stress monitoring device 13, torque monitoring device 14, and data transmission device 2 to enter the working state and collect data. When it receives the unit yaw end signal sent by the main control system of the wind turbine generator set, it controls the temperature monitoring device 11, vibration monitoring device 12, stress monitoring device 13, torque monitoring device 14, and data transmission device 2 to enter the sleep state.

[0071] More specifically, the yaw monitoring and control device 15 can be a microcontroller, PLC controller, etc., and can achieve sleep and operation by controlling the power supply of the temperature monitoring device 11, vibration monitoring device 12, stress monitoring device 13, torque monitoring device 14 and data transmission device 2.

[0072] Furthermore, the operating states of the wind turbine generator set include: normal operating state and abnormal operating state;

[0073] The wind turbine generator set is considered to be in normal operating condition if the following conditions are met simultaneously: the grease temperature is not lower than the preset temperature threshold, the caliper vibration value does not exceed the preset vibration threshold, the tower top stress value does not exceed the preset stress threshold, and the yaw motor torque value does not exceed the preset stress threshold.

[0074] Otherwise, the wind turbine generator set is determined to be in an abnormal operating state.

[0075] Specifically, in this embodiment, under normal circumstances, when the grease temperature, caliper vibration, tower top stress, and yaw motor torque are all within the normal range, it indicates that the wind turbine generator is operating normally; when at least one of the grease temperature, caliper vibration, tower top stress, and yaw motor torque is in an abnormal range, it indicates that the wind turbine generator is operating abnormally.

[0076] Furthermore, the server 3 is used to output a first alarm command when the grease temperature value is lower than a preset temperature threshold; output a second alarm command when the caliper vibration value exceeds a preset vibration threshold; output a third alarm command when the tower top stress value exceeds a preset stress threshold; and output a fourth alarm command when the yaw motor torque value exceeds a preset stress threshold.

[0077] Specifically, in this embodiment, when the collected grease temperature value is lower than the preset temperature threshold, it indicates that the wind turbine generator is in an abnormal operating state during yaw. At this time, the lubricating effect of the grease is limited, and the wind turbine generator may experience significant friction during yaw, increasing wear on the contact parts. Therefore, a first alarm command is generated to remind maintenance personnel to perform maintenance, replace the grease, or heat the grease to improve lubrication. When the caliper vibration value exceeds the preset vibration threshold, it indicates that the wind turbine generator is in an abnormal operating state during yaw. The wind turbine generator may experience significant vibration during yaw, posing a certain safety hazard. Therefore, a second alarm command is generated to remind maintenance personnel to perform maintenance. When the tower top stress value exceeds the preset stress threshold, it indicates that the wind turbine generator is in an abnormal operating state during yaw. The wind turbine generator may experience uneven stress during yaw. Therefore, a third alarm command is generated to remind maintenance personnel to perform maintenance. When the torque value of the yaw motor exceeds the preset stress threshold, a fourth alarm is generated, indicating that the wind turbine is in an abnormal operating state during yaw and the yaw motor may be overloaded. The fourth alarm command is generated to remind maintenance personnel to carry out maintenance.

[0078] More specifically, an audible and visual alarm device is installed in the wind farm monitoring room. The audible and visual alarm device is connected to server 3. When it receives the first alarm command, the second alarm command, the third alarm command and the fourth alarm command sent by server 3, it generates the corresponding audible and visual alarm to issue a warning.

[0079] Furthermore, the system also includes:

[0080] The damping adjustment device 4 is installed on the caliper 51 of the wind turbine generator set. It is used to adjust the damping torque between the caliper 51 and the gear ring 52 when the caliper vibration value exceeds the preset vibration threshold, so as to reduce the caliper vibration value to below the preset vibration threshold.

[0081] Specifically, in this embodiment, when the caliper vibration value exceeds the preset vibration threshold, it indicates that the wind turbine generator is in an abnormal operating state during yaw. The wind turbine generator may experience significant vibration during yaw, posing a certain safety hazard to its operation. Therefore, a second alarm is generated. To avoid continuous oscillation causing damage to the wind turbine and creating a safety hazard, a damping adjustment device 4 is installed on the caliper 51 of the wind turbine generator. When the caliper vibration value exceeds the preset vibration threshold, the damping torque between the caliper 51 and the gear ring 52 is adjusted in a timely manner through the damping adjustment device 4 to reduce the caliper vibration value so that the caliper vibration value is reduced to not exceed the preset vibration threshold.

[0082] Furthermore, the caliper 51 is provided with a groove 511; the damping adjustment device 4 includes:

[0083] A lower sliding pad 41 is disposed between the caliper 51 and the gear ring 52, with one end of the lower sliding pad 41 located within the groove 511;

[0084] A drive rod 42 is rotatably mounted on the caliper 51. One end of the drive rod 42 is located in the groove 511 of the caliper 51 and is in contact with the lower sliding pad 41 through a clamping block 43. By rotating the drive rod 42, the pressure applied by the clamping block 43 to the lower sliding pad 41 can be adjusted, thereby adjusting the damping torque between the caliper 51 and the gear ring 52.

[0085] Specifically, such as Figure 3 As shown, in this embodiment, the yaw system of the wind turbine generator set includes: a main frame 53, which is connected to a gear ring 52 and a tower top flange 55 by a first bolt 54; and a caliper 51, which is also fixed to the main frame 53 of the wind turbine generator set by a second bolt 56. A lower sliding pad 41 and a side sliding pad 58 are provided on the contact surface between the caliper 51 and the gear ring 52, and an upper sliding pad 57 is provided on the contact surface between the gear ring 52 and the main frame. A grease filling hole 512 is provided on the caliper corresponding to the side sliding pad 58. Collecting the temperature data inside the grease filling hole is equivalent to collecting the operating temperature data of the side sliding pad 58. More specifically, the drive rod 42 uses a rotary seal with the caliper 51 to prevent grease leakage.

[0086] More specifically, the caliper 51 is provided with a groove 511, and the lower end of the lower sliding pad 41 is located in the groove 511. The groove 511 can limit the lower sliding pad 41 and prevent it from displacing. A clamping block 43 is provided in the groove 511. The first end face of the clamping block 43 contacts the end face of the lower sliding pad 41, and the second end face of the clamping block 43 contacts the end of the drive rod 42 located in the caliper 51. By rotating the drive rod 42, the pressure applied by the clamping block 43 to the lower sliding pad 41 can be adjusted, thereby adjusting the damping torque between the caliper 51 and the gear ring 52 and reducing fatigue damage caused by alternating stress from oscillating loads. More specifically, the lower sliding pad 41 can be configured as a hollow cylindrical structure, and a groove is provided at the end of the lower sliding pad 41 that contacts the tightening block 43; the tightening block 43 is configured as an inverted T-shaped structure, and the groove of the tightening block 43 and the lower sliding pad 41 realize the mutual matching of the tightening block 43 and the lower sliding pad 41, ensuring more stable contact.

[0087] Furthermore, the damping adjustment device 4 also includes:

[0088] A drive motor 44 is mounted on the caliper 51 and is used to provide rotational driving force to the drive rod 42;

[0089] The drive motor 44 is communicatively connected to the server 3. The server is also used to generate motor control commands based on the caliper vibration value to adjust the pressure applied by the drive rod 42 to the lower sliding pad 41, thereby adjusting the damping torque between the caliper 51 and the gear ring 52.

[0090] Specifically, such as Figure 4 As shown, in this embodiment, when the caliper vibration value exceeds the preset vibration threshold, in order to respond quickly and adjust the vibration in a timely manner, and reduce fatigue damage caused by alternating stress from the oscillating load, the damping adjustment device 4 is configured to also include a drive motor 44. The drive motor 44 is controlled by a frequency converter, and the frequency converter is connected to the server via a communication module. The connection between the output shaft of the drive motor 44 and the drive rod 42 is configured as a lead screw structure. When the output shaft of the drive motor 44 rotates, the drive rod 42 rotates synchronously. When the server 3 determines that the caliper vibration value exceeds the preset vibration threshold, the server 3 generates a motor control signal based on the caliper vibration value and sends the motor control signal to the frequency converter. The frequency converter controls the drive motor 44 to rotate the corresponding number of revolutions, causing the drive rod 42 to produce a corresponding displacement. After the drive rod 42 rotates, the pressure applied to the lower sliding pad 41 increases, thereby adjusting the damping torque between the caliper 51 and the gear ring 52, thereby reducing the vibration of the caliper relative to the gear ring 52 and the main frame 53.

[0091] More specifically, server 3 selects the corresponding control quantity of drive motor 33 from the preset control curve based on the caliper vibration value, thereby generating a control command for drive motor 33. The horizontal axis of the preset control curve is the caliper vibration value, and the vertical axis is the number of rotations of drive motor 33. The preset control curve is determined by fitting historical data.

[0092] The present invention also provides a wind turbine generator set equipped with the above-mentioned wind turbine generator set yaw monitoring system.

[0093] Those skilled in the art will understand that all or part of the steps in the methods of the above embodiments can be implemented by a program instructing related hardware. This program is stored in a storage medium and includes several instructions to cause a microcontroller, chip, or processor to execute all or part of the steps of the methods described in the various embodiments of the present invention. The aforementioned storage medium includes various media capable of storing program code, such as a USB flash drive, a portable hard drive, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk.

[0094] The optional embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the embodiments of the present invention are not limited to the specific details described above. Within the scope of the technical concept of the embodiments of the present invention, various simple modifications can be made to the technical solutions of the embodiments of the present invention, and these simple modifications all fall within the protection scope of the embodiments of the present invention. It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. To avoid unnecessary repetition, the embodiments of the present invention will not further describe the various possible combinations.

[0095] Furthermore, various different embodiments of the present invention can be combined in any way, as long as they do not violate the spirit of the embodiments of the present invention, they should also be regarded as the content disclosed by the embodiments of the present invention.

Claims

1. A yaw monitoring system for wind turbine generator sets, characterized in that, The system includes: Sensor group (1) is installed on the wind turbine generator set to acquire the grease temperature, caliper vibration, tower top stress and yaw motor torque values ​​of the wind turbine generator set during the yaw process; A data transmission device (2) is installed on the wind turbine generator set and is connected in communication with the sensor group (1) to realize data transmission; The server (3) is connected in communication with the data transmission device (2) and is used to determine the operating status of the wind turbine generator set during the yaw process based on the grease temperature value, caliper vibration value, tower top stress value and yaw motor torque value of the wind turbine generator set during the yaw process. The system further includes: a damping adjustment device (4), disposed on the caliper (51) of the wind turbine generator set, used to adjust the damping torque between the caliper (51) and the gear ring (52) when the caliper vibration value exceeds a preset vibration threshold, so as to reduce the caliper vibration value to below the preset vibration threshold; the caliper (51) is provided with a groove (511); the damping adjustment device (4) includes: A lower sliding pad (41) is disposed between the caliper (51) and the gear ring (52), with one end of the lower sliding pad (41) located in the groove (511); A drive rod (42) is rotatably mounted on the caliper (51). One end of the drive rod (42) is located in the groove (511) of the caliper (51) and is in contact with the lower sliding pad (41) through a clamping block (43). By rotating the drive rod (42), the pressure applied by the clamping block (43) to the lower sliding pad (41) can be adjusted, thereby adjusting the damping torque between the caliper (51) and the gear ring (52). A drive motor is mounted on the caliper (51) and is used to provide rotational driving force to the drive rod (42). The drive motor is communicatively connected to the server (3), which is also used to generate motor control commands based on the caliper vibration value to adjust the pressure applied by the drive rod (42) to the lower sliding pad (41), specifically including: The server (3) selects the corresponding control quantity of the drive motor based on the caliper vibration value from the preset control curve according to the preset control curve, thereby generating a motor control command. The horizontal axis of the preset control curve is the caliper vibration value, and the vertical axis is the number of rotations of the drive motor. The preset control curve is determined by fitting historical data.

2. The wind turbine yaw monitoring system according to claim 1, characterized in that, The sensor group (1) includes: Temperature monitoring device (11) is installed in the grease filling hole of the caliper of the wind turbine generator set to obtain the temperature data of the lubricating grease in the grease filling hole; Vibration monitoring device (12) is installed on the caliper of the wind turbine generator set to acquire caliper vibration data; The stress monitoring device (13) is installed on the top of the wind turbine tower to obtain the tower top stress data; A torque monitoring device (14) is installed on the yaw motor of the wind turbine generator set to acquire the yaw motor torque data of the wind turbine generator set.

3. The wind turbine yaw monitoring system according to claim 2, characterized in that, The system also includes: Yaw monitoring and control device (15) is connected to the main control system of the wind turbine generator set. The yaw monitoring and control device (15) is used to control the temperature monitoring device (11), vibration monitoring device (12), stress monitoring device (13), torque monitoring device (14) and data transmission device (2) to enter the working state when the yaw start signal of the generator set is received from the main control system. It is also used to control the temperature monitoring device (11), vibration monitoring device (12), stress monitoring device (13), torque monitoring device (14) and data transmission device (2) to enter a sleep state when the unit yaw end signal sent by the main control system is received.

4. The wind turbine yaw monitoring system according to claim 2, characterized in that, The temperature monitoring device (11) is a temperature sensor; The vibration monitoring device (12) is a vibration acceleration sensor; The stress monitoring device (13) is a strain gauge; The torque monitoring device (14) is a torque sensor.

5. The wind turbine yaw monitoring system according to claim 1, characterized in that, The operating status of the wind turbine generator set includes: normal operating status and abnormal operating status; The wind turbine generator set is considered to be in normal operating condition if the following conditions are met simultaneously: the grease temperature is not lower than the preset temperature threshold, the caliper vibration value does not exceed the preset vibration threshold, the tower top stress value does not exceed the preset stress threshold, and the yaw motor torque value does not exceed the preset stress threshold. Otherwise, the wind turbine generator set is determined to be in an abnormal operating state.

6. The wind turbine yaw monitoring system according to claim 1, characterized in that, The server (3) is used to output a first alarm command when the grease temperature value is lower than a preset temperature threshold; output a second alarm command when the caliper vibration value exceeds a preset vibration threshold; output a third alarm command when the tower top stress value exceeds a preset stress threshold; and output a fourth alarm command when the yaw motor torque value exceeds a preset stress threshold.

7. A wind turbine generator set, characterized in that, The wind turbine generator set yaw monitoring system as described in any one of claims 1-6 is installed.

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