Wind shear early warning methods, systems and storage media for wind turbine generators

Abstract

This invention provides a wind shear early warning method, system, and storage medium for wind turbine generators, belonging to the field of wind power generation early warning technology. The method includes: acquiring collected wind speeds, including wind speeds at the wind turbine generator location and at different radially distributed points around the wind turbine generator; calculating an estimated wind speed at the wind turbine generator location based on the wind speed and calibration information at the different points; and controlling the wind turbine generator to adjust its operating state according to the estimated wind speed. By collecting wind speeds at different radially distributed points around the wind turbine generator, the wind speed at the wind turbine generator location is estimated, providing early warning to the wind turbine generator. This allows the wind turbine generator to adjust its operating state in advance based on the estimated wind speed, reducing accidents caused by excessive blade deformation due to high-speed airflow impacting the tower and improving blade lifespan.

Description

Technical Field

[0001] This invention relates to the field of wind power generation early warning technology, specifically to a wind shear early warning method for wind turbine generator sets, a wind shear early warning system for wind turbine generator sets, and a machine-readable storage medium. Background Technology

[0002] With the development of wind turbine generators, many high-quality areas, such as plains and hilly regions, have been extensively equipped with wind turbine generators. These areas have stable wind speeds and low wind shear. However, these areas are almost fully occupied, forcing wind turbine operators to deploy wind turbine generators in mountainous regions. Airflow conditions in mountainous areas are worse than in plains and hilly areas, and the location of the turbine generators is easily affected by both advection and updrafts in valleys. However, there are often no wind measurement devices in valleys. If the valley airflow is updrafted, the wind turbine generators may be impacted by high-speed airflows under unknown circumstances, causing significant deformation of the turbine blades. This can reduce the blade lifespan compared to the design life, and may even cause excessive blade deformation leading to impact with the tower. Summary of the Invention

[0003] The purpose of this invention is to provide a wind shear early warning method, system and storage medium for wind turbine generator sets, so as to at least solve the problem that wind turbine generator sets are subjected to high-speed airflow impacts due to the inability to monitor wind shear in mountainous areas, resulting in significant deformation of the wind turbine generator set blades and a reduction in blade life compared to the design life.

[0004] To achieve the above objectives, a first aspect of the present invention provides a wind shear early warning method for wind turbine generator sets, the method comprising:

[0005] The collected wind speed includes the wind speed at the location of the wind turbine generator and at different points radially around the wind turbine generator.

[0006] The estimated wind speed at the location of the wind turbine generator is calculated based on the wind speed and calibration information at different locations.

[0007] The wind turbine generator is controlled to adjust its operating status based on the estimated wind speed. By collecting wind speed data radially at different points around the wind turbine generator, the wind speed at the turbine generator's location is estimated, providing early warnings. This allows the wind turbine generator to adjust its operating status in advance based on the estimated wind speed, reducing the risk of blades deforming excessively and impacting the tower due to high-speed airflow, and thus extending blade lifespan.

[0008] In this embodiment of the application, the estimated wind speed at the location of the wind turbine generator is calculated based on the wind speed and calibration information at different locations, including:

[0009] Compare the wind speeds at outer and inner points along the same ray to determine the wind speed variation.

[0010] When it is determined that the wind speed is accelerating towards the wind turbine, the first distance between the current inner circle point and the wind turbine point, and the second distance between the outer circle point and the wind turbine point are calculated based on the calibration information of the current inner circle point, outer circle point and wind turbine point.

[0011] Based on the ratio of the first distance to the second distance and the wind speeds at the outer and inner perimeter points, a linear interpolation method is used to estimate the wind speed at the wind turbine generator location. This method, which estimates the wind speed at the wind turbine generator location based on measured wind speeds and measurement point calibration information, is simple and quick, and takes into account wind speed variations at different locations, making it more meaningful for reference.

[0012] In this embodiment of the application, the estimated wind speed at the location of the wind turbine generator is calculated based on the wind speed and calibration information at different locations, including:

[0013] Compare the wind speeds at outer and inner points along the same ray to determine the wind speed variation.

[0014] When it is determined that the wind speed is accelerating towards the wind turbine, the first distance between the current inner circle point and the wind turbine point, and the second distance between the outer circle point and the wind turbine point are calculated based on the calibration information of the current inner circle point, outer circle point and wind turbine point.

[0015] Calculate the third distance between the outer and inner points based on the first and second distances;

[0016] The first time from the outermost point to the innermost point under the historical maximum wind speed is calculated based on the third distance.

[0017] The second time from the inner perimeter point to the wind turbine location under the historical maximum wind speed is calculated based on the first distance.

[0018] The first wind speed increment is calculated based on the wind speed at the outer perimeter points, the wind speed at the inner perimeter points, and the first moment.

[0019] The estimated wind speed of the wind turbine generator is estimated based on the first wind speed increment, the second time, and the wind speed at the inner perimeter points.

[0020] In this embodiment of the application, the estimated wind speed at the location of the wind turbine generator is calculated based on the wind speed and calibration information at different locations, including:

[0021] Compare the wind speeds at outer and inner points along the same ray to determine the wind speed variation.

[0022] When it is determined that the wind speed is accelerating towards the wind turbine generator, the first distance between the current inner perimeter point and the wind turbine generator point is calculated based on the calibration information of the current inner perimeter point and the wind turbine generator point.

[0023] The second time from the inner perimeter point to the wind turbine location under the historical maximum wind speed is calculated based on the first distance.

[0024] The second wind speed increment is calculated based on the wind speed at different times at the same inner perimeter location;

[0025] The estimated wind speed of the wind turbine generator is estimated based on the second wind speed increment, the second time, and the wind speed at the inner perimeter points.

[0026] In this embodiment of the application, the method further includes:

[0027] Calculate the difference between the wind speed at the wind turbine generator location and the estimated wind speed;

[0028] The estimated wind speed is obtained by summing the estimated wind speed and the difference between them. The wind speed at the wind turbine location is formed by the superposition of the updraft in the valley and the horizontal airflow at the location of the wind turbine. The difference between the wind speed at the wind turbine location and the estimated wind speed is taken as the wind speed caused by the horizontal airflow at the current wind turbine location, and this is used to correct the estimated wind speed.

[0029] In this embodiment of the application, the method further includes:

[0030] The difference between the wind speed at the wind turbine generator location and the estimated wind speed is recalculated at preset intervals. The difference in this application is a rough estimate; to improve accuracy, the difference can be recalculated at preset intervals.

[0031] In this embodiment of the application, controlling the wind turbine generator to adjust its operating state based on the estimated wind speed includes:

[0032] Determine at least three pitch control nodes based on the calibrated relationship between wind speed and wind turbine pitch angle;

[0033] The operating status of the wind turbine is adjusted based on the estimated relationship between wind speed and pitch control nodes. Multiple pitch control nodes are determined according to requirements and serve as reference nodes for controlling the pitch of the wind turbine during actual early warning processes.

[0034] In this embodiment of the application, the first pitch node, the second pitch node, and the third pitch node are determined based on the calibrated relationship between the wind speed and the pitch angle of the wind turbine generator.

[0035] When the estimated wind speed is less than or equal to the wind speed at the first pitch node, the wind turbine generator set is controlled to continue operating in the current state.

[0036] When the estimated wind speed is greater than the wind speed at the first pitch node and less than or equal to the wind speed at the second pitch node, the wind turbine generator is controlled to pitch according to the pitch angle at the second pitch node.

[0037] When the estimated wind speed is greater than the wind speed at the second pitch node and less than or equal to the wind speed at the third pitch node, the wind turbine generator is controlled to pitch according to the pitch angle at the third pitch node.

[0038] When the estimated wind speed exceeds the wind speed at the third pitch node, the wind turbine generator is controlled to retract its pitch. During the warning process, the wind turbine generator is controlled according to the maximum pitch adjustment mode within the current pitch node wind speed range to ensure the safe operation of the wind turbine generator.

[0039] A second aspect of the present invention provides a wind shear early warning system for wind turbine generator sets, the system comprising:

[0040] Multiple wind measuring devices are arranged on the wind turbine generator and radially around the wind turbine generator to collect wind speed data at the wind turbine generator location and different locations around it.

[0041] The wind speed information collection device is installed on the wind turbine generator set to receive the wind speed collected by the wind measuring equipment and calculate the estimated wind speed at the wind turbine generator set location based on the collected wind speed and the stored calibration information of different locations.

[0042] The control system, installed on the wind turbine, adjusts the turbine's operating status based on estimated wind speed. This early warning system is designed for mountainous terrain, addressing the problem of wind shear, which cannot be detected in advance in mountainous areas, leading to high-speed airflow impacts on the wind turbine blades and significant blade deformation, resulting in a shorter blade lifespan than designed.

[0043] A third aspect of the present invention provides a machine-readable storage medium storing instructions for causing a machine to execute the wind shear early warning method for a wind turbine generator set.

[0044] Through the above technical solution, the wind shear early warning method for wind turbine generator sets provided in this application can effectively prevent wind turbine generator sets from encountering high wind speeds during operation, which would cause the blades to deform beyond the design value and impact the tower, thereby damaging the wind turbine generator set.

[0045] 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

[0046] 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:

[0047] Figure 1 This is a flowchart of a wind shear early warning method for wind turbine generator sets provided by one embodiment of the present invention;

[0048] Figure 2 This is a block diagram of a wind shear early warning system for a wind turbine generator set provided in one embodiment of the present invention;

[0049] Figure 3 This is a schematic diagram of the wind measurement equipment layout in a wind shear early warning system for wind turbine generator sets provided by one embodiment of the present invention.

[0050] Explanation of reference numerals in the attached figures

[0051] 1-Wind measuring equipment, 2-Wind turbine generator set. Detailed Implementation

[0052] 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.

[0053] Figure 1 This is a flowchart of a wind shear early warning method for wind turbine generators provided in one embodiment of the present invention. Figure 1 As shown, the method includes:

[0054] S1: Acquire the collected wind speed, which includes the wind speed at the location of the wind turbine generator and at different points radially surrounding the wind turbine generator. In this embodiment, a wind measuring device is used to collect the wind speed.

[0055] S2: Calculate the estimated wind speed at the location of the wind turbine generator based on the wind speed and calibration information at different locations.

[0056] S3: Adjust the operating status of the wind turbine generator based on the estimated wind speed. By collecting wind speed data radially at different points around the wind turbine generator, the wind speed at the wind turbine generator's location is estimated, providing early warning to the wind turbine generator. This allows the wind turbine generator to adjust its operating status in advance based on the estimated wind speed, reducing the risk of blades deforming excessively and impacting the tower due to high-speed airflow, and improving blade lifespan.

[0057] In this embodiment of the application, step S2, calculating the estimated wind speed at the wind turbine generator location based on the wind speed and calibration information at different locations, includes:

[0058] Compare the wind speeds at outer and inner points along the same ray to determine the wind speed variation. Generally, airflow speed changes as it passes through different locations; this change could be an increase or a decrease in speed. If two points on the same ray with the wind turbine location as the endpoint have different wind speeds, and the wind speed at the inner point is lower than that at the outer point, it can be inferred that the wind speed decreases from the outer edge to the inner edge. In this case, it can be inferred that the same airflow reaching the wind turbine location will not pose a risk. Conversely, if the wind speed at the inner point is higher than that at the outer point, it can be inferred that the wind speed increases from the outer edge to the inner edge. In this case, it can be inferred that the wind speed will continue to increase when the same airflow reaches the wind turbine location, posing a risk. Furthermore, if the wind speeds at the outer and inner points are the same, the current airflow speed is stable, and the wind speed measured at the inner point is the uncorrected estimated wind speed at the wind turbine location.

[0059] To ensure that the estimated wind speed for the wind turbine generators covers as much of the wind speed at the current turbine location as possible, the maximum wind speed among all locations in a radial pattern is used when determining wind speed changes. This results in a larger wind speed warning value for the wind turbine generators, effectively minimizing the impact of high wind speeds during wind shear on the generators.

[0060] In this application, when it is determined that the wind speed is accelerating towards the wind turbine generator, the first distance L1 between the current inner circle point and the wind turbine generator point, and the second distance L2 between the outer circle point and the wind turbine generator point are calculated based on the calibration information of the current inner circle point, outer circle point and wind turbine generator point.

[0061] Based on the ratio of the first distance to the second distance and the wind speeds at the outer and inner perimeter points, a linear interpolation method is used to estimate the wind speed at the wind turbine generator location. This method, which estimates the wind speed at the wind turbine generator location based on measured wind speeds and measurement point calibration information, is simple and quick, and takes into account wind speed variations at different locations, making it more meaningful for reference.

[0062] In other embodiments of this application, step S2, calculating the estimated wind speed at the wind turbine generator location based on wind speed and calibration information at different locations, includes:

[0063] Compare the wind speeds at outer and inner points along the same ray to determine the wind speed variation.

[0064] When it is determined that the wind speed is accelerating towards the wind turbine, the first distance L1 between the current inner point and the wind turbine point, and the second distance L2 between the outer point and the wind turbine point are calculated based on the calibration information of the current inner point, outer point and wind turbine point.

[0065] Calculate the third distance L3 between the outer perimeter points and the inner perimeter points based on the first distance L1 and the second distance L2;

[0066] Based on the third distance L3, calculate the first time t1 from the outermost point to the innermost point under the historical maximum wind speed Vmax, t1=L3 / Vmax;

[0067] Based on the first distance L1, calculate the second time t2 from the inner perimeter point to the wind turbine point under the historical maximum wind speed Vmax, t2=L1 / Vmax. The historical maximum wind speed can be the maximum wind speed of one year. If extreme weather occurs, the maximum wind speed that occurs once every 20 years can be used.

[0068] The first wind speed increment a1 is calculated based on the wind speed Vc1 at the outer perimeter, the wind speed Vc2 at the inner perimeter, and the first time t1, where a1 = (Vc2 - Vc1) / t1.

[0069] The estimated wind speed Vs of the wind turbine generator is estimated based on the first wind speed increment a1, the second time t2, and the wind speed Vc2 at the inner perimeter point. Vs = Vc2 + t2 × a1.

[0070] In other embodiments of this application, step S2, calculating the estimated wind speed of the wind turbine generator location based on wind speed and calibration information of different locations, includes: comparing the wind speeds of the outer and inner locations on the same ray to determine the wind speed change state.

[0071] When it is determined that the wind speed is accelerating towards the wind turbine generator, the first distance L1 between the current inner perimeter point and the wind turbine generator point is calculated based on the calibration information of the current inner perimeter point and the wind turbine generator point.

[0072] The second time t2 from the inner perimeter point to the wind turbine point is calculated based on the first distance L1 under the historical maximum wind speed Vmax. t2 = L1 / Vmax. The historical maximum wind speed can be the maximum wind speed of one year. If there is extreme weather, the maximum wind speed that occurs once every 20 years can be used.

[0073] The second wind speed increment a2 is calculated based on the wind speed at the same inner perimeter location at different times. Assuming the wind speed at the same inner perimeter location at the first time is Vc0, the wind speed at the second time is Vc1, and the interval between the first and second times is t0, then a2 = (Vc1 - Vc0) / t0. Generally, to predict the wind speed at the wind turbine location as quickly as possible, and considering the response time of the wind measuring equipment, the interval t0 between the two wind speeds used to calculate the second wind speed increment is taken as 0.5-2 seconds.

[0074] The estimated wind speed Vs of the wind turbine generator is estimated based on the second wind speed increment a2, the second time t2, and the wind speed Vc1 at the inner perimeter point. Vs = Vc1 + t2 × a2.

[0075] In this embodiment of the application, the calibration information includes: location coordinates, direction relative to the wind turbine generator, absolute altitude, and relative ground level.

[0076] Based on the calibration information of the current inner perimeter points, outer perimeter points, and wind turbine generator points, calculate the first distance between the current inner perimeter points and the wind turbine generator points, and the second distance between the outer perimeter points and the wind turbine generator points, including:

[0077] Based on the current coordinates, absolute altitude, and relative ground elevation of the inner, outer, and wind turbine locations, trigonometric functions are used to calculate the first distance between the inner location and the wind turbine location, and the second distance between the outer location and the wind turbine location.

[0078] The third distance is obtained by subtracting the first distance from the second distance.

[0079] In this embodiment of the application, the method further includes:

[0080] The estimated wind speed is corrected based on the wind speed at the wind turbine location. After correction, the estimated wind speed can better predict wind shear.

[0081] In this embodiment of the application, the estimated wind speed is corrected based on the wind speed at the wind turbine location, including:

[0082] Calculate the difference between the wind speed at the wind turbine generator location and the estimated wind speed;

[0083] The estimated wind speed is obtained by summing the estimated wind speed and the difference.

[0084] Assuming the estimated wind speed is Vs and the wind speed at the wind turbine generator location is Vc, the difference is C = Vc - Vs. Assuming C is the wind speed caused by the horizontal airflow at the current generator location, the estimated wind speed is always increased by C during the correction process. The corrected estimated wind speed is Vs_p = Vs + C.

[0085] In other embodiments, the least squares method can also be used to fit the wind speed at the wind measurement point, the wind speed measured at the top of the wind turbine, and the wind acceleration at the two points, and finally predict the wind speed based on the fitted function.

[0086] The wind speed at the wind turbine location is formed by the superposition of the updraft in the valley and the horizontal airflow at the location of the wind turbine. The difference between the wind speed at the wind turbine location and the estimated wind speed is taken as the wind speed caused by the horizontal airflow at the current wind turbine location, and this is used to correct the estimated wind speed.

[0087] In this embodiment of the application, the method further includes:

[0088] The difference between the wind speed at the wind turbine location and the estimated wind speed is recalculated at preset intervals. The difference in this application is a rough estimate; to improve accuracy, the difference can be recalculated at preset intervals. In this embodiment, the preset interval can be set according to the wind turbine environment, for example, an interval of 1 hour or less.

[0089] In this embodiment of the application, controlling the wind turbine generator to adjust its operating state based on the estimated wind speed includes:

[0090] Determine at least three pitch control nodes based on the calibrated relationship between wind speed and wind turbine pitch angle;

[0091] The operating status of the wind turbine is adjusted based on the estimated relationship between wind speed and pitch control nodes. Multiple pitch control nodes are determined according to requirements and serve as reference nodes for controlling the pitch of the wind turbine during actual early warning processes.

[0092] In this embodiment of the application, the first pitch node, the second pitch node, and the third pitch node are determined based on the calibrated relationship between the wind speed and the pitch angle of the wind turbine generator.

[0093] When the estimated wind speed is less than or equal to the wind speed at the first pitch node, the wind turbine generator set is controlled to continue operating in the current state.

[0094] When the estimated wind speed is greater than the wind speed at the first pitch node and less than or equal to the wind speed at the second pitch node, the wind turbine generator is controlled to pitch according to the pitch angle at the second pitch node.

[0095] When the estimated wind speed is greater than the wind speed at the second pitch node and less than or equal to the wind speed at the third pitch node, the wind turbine generator is controlled to pitch according to the pitch angle at the third pitch node.

[0096] When the estimated wind speed exceeds the wind speed at the third pitch node, the wind turbine generator is controlled to retract its pitch. During the warning process, the wind turbine generator is controlled according to the maximum pitch adjustment mode within the current pitch node wind speed range to ensure the safe operation of the wind turbine generator.

[0097] In extreme weather conditions, wind turbines should be prioritized for protection to minimize losses, allowing for temporary loss of power generation. When wind speed triggers protection, the danger level increases sequentially from low to high wind speed. If the estimated wind speed level increases continuously, the wind turbine will trigger protection actions consecutively. To avoid frequent activation of the wind turbine, if the predicted wind speed level decreases continuously or drops within a short period, the protection action will be delayed. The delay time can be set to 1 minute or 10 minutes, etc. If the estimated wind speed level decreases after the delay, the protection action level can be reduced or the protection action can be deactivated. If the estimated wind speed is still within the dangerous wind speed range, the delay time for reducing the protection action time can be further delayed. The delay time can be determined based on the characteristics of wind speed changes; 10 minutes can be used for wind speed fluctuations, and 1 minute can be used for wind speed fluctuations.

[0098] A second embodiment of the present invention provides a wind shear early warning system for wind turbine generator sets, the system comprising:

[0099] Multiple wind measuring devices are arranged on the wind turbine generator and radially around the wind turbine generator to collect wind speed data at the wind turbine generator location and different locations around it.

[0100] The wind speed information collection device is installed on the wind turbine generator set to receive the wind speed collected by the wind measuring equipment and calculate the estimated wind speed at the wind turbine generator set location based on the collected wind speed and the stored calibration information of different locations.

[0101] The control system, installed on the wind turbine, adjusts the turbine's operating status based on estimated wind speed. This early warning system is designed for mountainous terrain, addressing the problem of wind shear, which cannot be detected in advance in mountainous areas, leading to high-speed airflow impacts on the wind turbine blades and significant blade deformation, resulting in a shorter blade lifespan than designed.

[0102] In some embodiments, wind measuring devices are arranged in eight directions around the wind turbine. This model assumes that the wind blows over a large area, meaning that the wind turbine will be subjected to the same wind from any direction when it passes the wind measuring device location. It also assumes that the wind captured by the wind measuring device does not bypass the wind turbine, and that the wind measuring devices are arranged in eight directions around the turbine. The maximum estimated wind speed captured and calculated by any one of the wind measuring device locations will be adopted, thus mitigating the influence of wind direction randomness to some extent; therefore, wind direction is not considered.

[0103] In this embodiment of the application, the wind turbine generator set is arranged on the mountaintop or hillside in a mountainous area. Figure 3As shown, in this embodiment, the wind turbine is positioned on a mountaintop. Anemometers or rotating anemometers, or a combination thereof, can be used for wind measurement. These devices are arranged around the wind turbine, with multiple devices positioned in the prevailing wind direction and a smaller number in other wind directions, or they can be evenly distributed around the turbine. The placement height can be chosen from valley floor, hillside, or other locations. When arranging the anemometers, they should be radially arranged, meaning the extension line connecting several anemometers in a certain direction should intersect or nearly intersect the axis of the wind turbine tower. Wind speed data collection equipment is installed on the wind turbine. The anemometers are connected to this equipment via network cable or fiber optic cable. This equipment collects wind speed data from each anemometer near the turbine, as well as from the wind turbine's own anemometer. This system can predict the wind speed at the mountaintop based on the measured wind speeds in the valley and hillside, providing early warning for the wind turbine positioned on the mountaintop.

[0104] A third aspect of the present invention provides a machine-readable storage medium storing instructions for causing a machine to execute the wind shear early warning method for a wind turbine generator set.

[0105] 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.

[0106] 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.

[0107] 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 method for early warning of wind shear in wind turbine generator sets, characterized in that, The method includes: The collected wind speed includes the wind speed at the location of the wind turbine generator and at different points radially around the wind turbine generator. The estimated wind speed at the wind turbine generator location is calculated based on wind speed and calibration information at different locations, including: Compare the wind speeds at outer and inner points along the same ray to determine the wind speed variation. When it is determined that the wind speed is accelerating towards the wind turbine, the first distance between the current inner circle point and the wind turbine point, and the second distance between the outer circle point and the wind turbine point are calculated based on the calibration information of the current inner circle point, outer circle point and wind turbine point. Calculate the third distance between the outer and inner points based on the first and second distances; The first time from the outermost point to the innermost point under the historical maximum wind speed is calculated based on the third distance. The second time from the inner perimeter point to the wind turbine location under the historical maximum wind speed is calculated based on the first distance. The first wind speed increment is calculated based on the wind speed at the outer perimeter points, the wind speed at the inner perimeter points, and the first moment. The estimated wind speed of the wind turbine generator is estimated based on the first wind speed increment, the second time, and the wind speed at the inner perimeter points. or Compare the wind speeds at outer and inner points along the same ray to determine the wind speed variation. When it is determined that the wind speed is accelerating towards the wind turbine generator, the first distance between the current inner perimeter point and the wind turbine generator point is calculated based on the calibration information of the current inner perimeter point and the wind turbine generator point. The second time from the inner perimeter point to the wind turbine location under the historical maximum wind speed is calculated based on the first distance. The second wind speed increment is calculated based on the wind speed at different times at the same inner perimeter location; The estimated wind speed of the wind turbine generator is estimated based on the second wind speed increment, the second time, and the wind speed at the inner perimeter points. The wind turbine generator set is adjusted to adjust its operating status based on the estimated wind speed.

2. The wind shear early warning method for wind turbine generator sets according to claim 1, characterized in that, Adjusting the operating status of the wind turbine generator based on the estimated wind speed includes: Determine at least three pitch control nodes based on the calibrated relationship between wind speed and wind turbine pitch angle; The operating status of the wind turbine generator is adjusted based on the estimated relationship between wind speed and pitch control node.

3. The wind shear early warning method for wind turbine generator sets according to claim 2, characterized in that, The first pitch node, the second pitch node, and the third pitch node are determined based on the calibrated relationship between wind speed and the pitch angle of the wind turbine generator. When the estimated wind speed is less than or equal to the wind speed at the first pitch node, the wind turbine generator set is controlled to continue operating in the current state. When the estimated wind speed is greater than the wind speed at the first pitch node and less than or equal to the wind speed at the second pitch node, the wind turbine generator is controlled to pitch according to the pitch angle at the second pitch node. When the estimated wind speed is greater than the wind speed at the second pitch node and less than or equal to the wind speed at the third pitch node, the wind turbine generator is controlled to pitch according to the pitch angle at the third pitch node. When the estimated wind speed is greater than the wind speed at the third pitch node, the wind turbine generator is controlled to retract its pitch.

4. A wind shear early warning system for wind turbine generator sets, used to implement the wind shear early warning method for wind turbine generator sets as described in any one of claims 1-3, characterized in that, The system includes: Multiple wind measuring devices are arranged on the wind turbine generator and radially around the wind turbine generator to collect wind speed data at the wind turbine generator location and different locations around it. The wind speed information collection device is installed on the wind turbine generator set to receive the wind speed collected by the wind measuring equipment and calculate the estimated wind speed at the wind turbine generator set location based on the collected wind speed and the stored calibration information of different locations. The control system, located on the wind turbine generator, is used to adjust the operating status of the wind turbine generator based on the estimated wind speed.

5. A machine-readable storage medium storing instructions for causing a machine to perform the wind shear early warning method for a wind turbine generator set as described in any one of claims 1-3.

Images