Wind turbine blade tip clearance p1 level estimation method, control method and system

Abstract

The application provides a wind turbine blade tip clearance P1 level estimation method, control method and system, belonging to the wind power generation measurement and control technical field. The method comprises the following steps: obtaining a first relationship curve of clearance and power generation power and a second relationship curve of clearance and pitch angle according to full-condition simulation data statistics; obtaining an actual power generation power value and an actual pitch angle of a current wind turbine; determining a power generation power blade tip clearance, a pitch angle blade tip clearance, a power clearance weight and a pitch angle clearance weight according to the actual power generation power value, the actual pitch angle, the first relationship curve and the second relationship curve; and calculating an estimated value of the current state clearance level according to the power generation power blade tip clearance, the pitch angle blade tip clearance, the power clearance weight and the pitch angle clearance weight. According to the simulation data statistics and the operation data of the current wind turbine, the blade tip clearance level of the current state is evaluated, and a control mode is adopted according to the blade tip clearance level, so that the current blade tip clearance distance can be effectively increased and the tower scanning risk can be reduced.

Description

Technical Field

[0001] This invention relates to the field of wind power generation measurement and control technology, specifically to a method for estimating the tip clearance P1 level of a wind turbine blade, a system for estimating the tip clearance P1 level of a wind turbine blade, a method for optimizing the tip clearance control of a wind turbine blade, a system for optimizing the tip clearance control of a wind turbine blade, and a machine-readable storage medium. Background Technology

[0002] As wind turbine capacities increase and blades become longer, the increased blade length leads to reduced flexibility and greater deformation during power generation. The distance between the blade tip and the tower (clearance) has become a key performance indicator in turbine design. Insufficient clearance can pose a risk of tower swiping during operation, potentially even causing tower collapse in severe cases.

[0003] Currently, methods for improving the clearance of large-blade turbine units mainly fall into two categories: pre-design and post-control. Pre-design methods include increasing blade stiffness, increasing the main shaft tilt angle, rotor cone angle, and blade pre-bending. Post-control methods primarily involve adding real-time blade tip monitoring equipment, such as lidar and high-speed image recognition, to improve the current clearance value when a decrease in clearance is detected.

[0004] While initial design methods can improve tip clearance to some extent, the variable operating environment of the turbine makes it highly susceptible to environmental influences, and initial design cannot fully anticipate changes that may occur during operation. Existing post-operation control methods often involve adding tip clearance monitoring equipment, increasing hardware costs. Summary of the Invention

[0005] The purpose of this invention is to provide a method, control method and system for estimating the tip clearance P1 level of a wind turbine blade. This method can assess the current tip clearance level based on simulation data statistics and current wind turbine operating data without adding clearance monitoring equipment. Based on the predicted tip clearance level, a control method is adopted to effectively increase the current clearance value and reduce the risk of tower sweeping.

[0006] To achieve the above objectives, a first aspect of the present invention provides a method for estimating the tip clearance P1 level of a wind turbine blade, the method comprising:

[0007] Based on the full-condition simulation data, the first relationship curve between headroom and power generation and the second relationship curve between headroom and pitch angle were obtained. The first relationship curve is the 1st percentile P1 curve of headroom and power generation, and the second relationship curve is the 1st percentile P1 curve of headroom and pitch angle.

[0008] Obtain the current actual power generation value and actual pitch angle of the wind turbine;

[0009] The tip clearance of power generation, tip clearance of pitch angle, power clearance weight and pitch angle clearance weight are determined based on the actual power generation value, the actual pitch angle, the first relationship curve and the second relationship curve.

[0010] The estimated current air clearance level is calculated based on the blade tip clearance at power generation, blade tip clearance at pitch angle, power generation clearance weight, and pitch angle clearance weight. This method enables real-time estimation of the blade tip clearance level.

[0011] In this embodiment of the application, the power generation tip clearance, pitch angle tip clearance, power generation tip clearance weight, and pitch angle tip clearance weight are determined based on the actual power generation value, the actual pitch angle, the first relationship curve, and the second relationship curve, including:

[0012] Obtain the maximum power generation value and the first power generation value corresponding to the inflection point of the first relationship curve from the first relationship curve;

[0013] Obtain the minimum pitch angle value and the first pitch angle value corresponding to the inflection point of the second relationship curve from the second relationship curve;

[0014] Obtain the tip clearance corresponding to the actual power generation from the first relationship curve;

[0015] Obtain the blade tip clearance corresponding to the actual pitch angle from the second relationship curve;

[0016] Calculate the power generation net weight and pitch angle net weight based on the actual power generation, actual pitch angle, maximum power generation value, first power generation value, minimum pitch angle value, and first pitch angle value.

[0017] In this embodiment of the application, the power generation clearance weight and the pitch angle clearance weight are calculated based on the actual power generation, the actual pitch angle, the maximum power generation value, the first power generation value, the minimum pitch angle value, and the first pitch angle value, including:

[0018] The net power generation weight value K is calculated based on the actual power generation, the maximum power generation value, and the first power generation value. β ,

[0019] Where P is the actual power generation, P0 is the first power generation value, and P1 is the maximum power generation value;

[0020] Calculate the pitch angle clearance weight value K based on the actual pitch angle, minimum pitch angle value, and first pitch angle value. p , Where β is the actual pitch angle, β0 is the minimum pitch angle value, and β1 is the first pitch angle value.

[0021] In this embodiment of the application, the estimated value of the current state clearance level is calculated based on the power generation tip clearance, the pitch angle tip clearance, the power generation clearance weight, and the pitch angle clearance weight, including:

[0022] The estimated value of the current airspace level, TipCl_Es, is calculated using the following formula.

[0023] Where TipCl_P is the tip clearance for power generation, and TipCl_β is the tip clearance for pitch angle.

[0024] In this embodiment of the application, the step of obtaining the first relationship curve between airspace and power generation and the second relationship curve between airspace and pitch angle based on full-condition simulation data includes:

[0025] The corresponding time sequence of simulated power generation, simulated pitch angle and blade tip clearance is extracted from the full-condition simulation data.

[0026] The simulated power generation and simulated pitch angle are each divided into multiple intervals at certain intervals;

[0027] Calculate the leaf tip clearance within each interval;

[0028] The first relationship curve is obtained by calculating the tip clearance percentile P1 based on the blade tip clearance in each interval of the simulated power generation.

[0029] The second relationship curve is obtained by calculating the tip clearance percentile P1 based on the simulated blade pitch angle within each interval.

[0030] A second aspect of the present invention provides a wind turbine blade tip clearance P1 level estimation system, comprising:

[0031] The simulation data statistics unit is used to statistically obtain the first relationship curve between headroom and power generation and the second relationship curve between headroom and pitch angle based on the full-condition simulation data. The first relationship curve is the 1st percentile P1 curve of headroom and power generation, and the second relationship curve is the 1st percentile P1 curve of headroom and pitch angle.

[0032] The data acquisition unit is used to acquire the actual power generation value and actual pitch angle of the current wind turbine.

[0033] The weight calculation unit is used to determine the tip clearance of power generation, tip clearance of pitch angle, power clearance weight and pitch angle clearance weight based on the actual power generation value, the actual pitch angle, the first relationship curve and the second relationship curve.

[0034] The clearance estimation unit is used to calculate the estimated value of the current clearance level based on the blade tip clearance of power generation, blade tip clearance of pitch angle, clearance weight of power generation, and clearance weight of pitch angle.

[0035] A third aspect of the present invention provides a method for optimizing the tip clearance control of a wind turbine blade, the method comprising:

[0036] The estimated value of the current air clearance level is calculated using the aforementioned wind turbine blade tip clearance level P1 estimation method.

[0037] Determine the optimal airspace control strategy based on the estimated current airspace level.

[0038] In this embodiment of the application, determining an airspace optimization control strategy based on an estimated value of the current airspace level includes:

[0039] Obtain the current unit's safe clearance distance, dangerous clearance distance, and optimized preset pitch angle.

[0040] Compare the current estimated airspace level, safe airspace distance, and dangerous airspace distance;

[0041] If the estimated current airspace level is greater than the safe airspace distance, no control or protection actions will be taken.

[0042] If the estimated current airspace level is less than the airspace danger distance, the pitch system will retract the pitch to the preset pitch angle.

[0043] If the estimated current airspace level is greater than or equal to the danger distance and less than or equal to the safe distance, the pitch system retracts the pitch to the calculated first pitch angle; the first pitch angle is calculated based on the safe distance, the danger distance, and the optimized preset pitch angle according to the following formula:

[0044] Where, β c The preset pitch angle is used to optimize the airspace, Cl_L is the dangerous airspace distance, Cl_H is the safe airspace distance, and TipCl_Es is the estimated value of the current airspace level.

[0045] A fourth aspect of the present invention provides a wind turbine blade tip clearance control system, the system comprising:

[0046] The wind turbine blade tip clearance P1 level estimation system is used to calculate the estimated value of the current clearance level;

[0047] The pitch control system is used to determine the optimal airspace control strategy based on the estimated airspace level for the current state.

[0048] On the other hand, the present invention provides a machine-readable storage medium storing instructions for causing a machine to execute the wind turbine tip clearance P1 level estimation method or the wind turbine tip clearance optimization control method.

[0049] Through the above technical solution, the method for estimating the tip clearance P1 level of the wind turbine blades can assess the current tip clearance level based on simulation data statistics and the current operating data of the wind turbine without adding clearance monitoring equipment. Based on the predicted tip clearance level, control measures can be taken to effectively increase the current clearance value and reduce the risk of tower sweeping.

[0050] 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

[0051] 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:

[0052] Figure 1 This is a flowchart of a method for estimating the tip clearance P1 of a wind turbine blade according to one embodiment of the present invention.

[0053] Figure 2 This is a percentage chart of blade tip clearance-power provided by one embodiment of the present invention;

[0054] Figure 3 This is a percentile statistical chart of blade tip clearance-pitch angle provided by one embodiment of the present invention;

[0055] Figure 4 This is a flowchart of the calculation of power generation net clearance weight and pitch angle net clearance weight provided by one embodiment of the present invention;

[0056] Figure 5 This is a block diagram of a wind turbine blade tip clearance P1 level estimation system provided in one embodiment of the present invention;

[0057] Figure 6 This is a flowchart of a wind turbine blade tip clearance optimization control method provided by one embodiment of the present invention. Detailed Implementation

[0058] 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.

[0059] Figure 1 This is a flowchart of a method for estimating the tip clearance P1 of a wind turbine blade according to one embodiment of the present invention. Figure 1 As shown, the method includes:

[0060] S1: Based on the full-condition simulation data, the first relationship curve between headroom and power generation and the second relationship curve between headroom and pitch angle are obtained. The first relationship curve is the 1st percentile P1 curve of headroom and power generation, and the second relationship curve is the 1st percentile P1 curve of headroom and pitch angle.

[0061] In this embodiment of the application, the 1% percentile means that 1% of the data points in the statistical sample are below the P1 value, that is, 99% of the data points are greater than P1. Therefore, the P1 value is used to evaluate the level of minimum clearance within the sample interval.

[0062] In this embodiment of the application, the step of obtaining the first relationship curve between airspace and power generation and the second relationship curve between airspace and pitch angle based on full-condition simulation data includes:

[0063] Based on a large amount of full-condition simulation data, the corresponding time series of simulated power generation, simulated pitch angle β, and tip clearance TipCl were extracted.

[0064] For the simulated power generation Power, the power generation Power is divided into m intervals Power_Bin=[P1,P2,……Pm] according to a certain power interval. The tip clearance TipCl in each Bin interval is counted. The clearance percentile P1 is calculated according to formula (1). The 1% percentile P1 curve of clearance and power generation power is obtained, which is the first relationship curve. The first relationship curve obtained in one embodiment of this application is as follows: Figure 2 As shown.

[0065] TCP_P1(m) = prctile(TipCl_m, 1) (1)

[0066] For the simulated pitch angle β, the pitch angle β is divided into n intervals β_Bin=[β1,β2,……βn] according to a certain angular interval. The tip clearance TipCl in each Bin interval is counted. The clearance percentile P1 is calculated according to formula (2). The 1% percentile P1 curve of clearance and pitch angle is obtained, which is the second relationship curve. The second relationship curve obtained in one embodiment of this application is as follows: Figure 3 As shown:

[0067] TCβ_P1(n) = prctile(TipCl_n, 1) (2)

[0068] In some other embodiments, the extracted simulated power generation, simulated pitch angle β, and tip clearance TipCl corresponding time series need to be filtered to remove invalid data, thereby improving the accuracy of the obtained first and second relationship curves.

[0069] S2: Obtain the actual power generation value and actual pitch angle of the current wind turbine. In this embodiment, the actual power generation value and actual pitch angle of the current wind turbine are obtained in real time through the acquisition device on the wind turbine.

[0070] S3: Determine the tip clearance of power generation, tip clearance of pitch angle, power clearance weight, and pitch angle clearance weight based on the actual power generation value, actual pitch angle, first relationship curve, and second relationship curve.

[0071] In the embodiments of this application, such as Figure 4 As shown, the blade tip clearance for power generation, blade tip clearance for pitch angle, power generation clearance weight, and pitch angle clearance weight are determined based on the actual power generation value, the actual pitch angle, the first relationship curve, and the second relationship curve. These include:

[0072] Obtain the maximum power generation value and the first power generation value corresponding to the inflection point of the first relationship curve from the first relationship curve;

[0073] Obtain the minimum pitch angle value and the first pitch angle value corresponding to the inflection point of the second relationship curve from the second relationship curve;

[0074] The tip clearance corresponding to the actual power generation is obtained from the first relationship curve by looking up a table.

[0075] The actual pitch angle and blade tip clearance are obtained from the second relationship curve by looking up a table.

[0076] Calculate the power generation net weight and pitch angle net weight based on the actual power generation, actual pitch angle, maximum power generation value, first power generation value, minimum pitch angle value, and first pitch angle value.

[0077] In this embodiment of the application, the power generation clearance weight and the pitch angle clearance weight are calculated based on the actual power generation, the actual pitch angle, the maximum power generation value, the first power generation value, the minimum pitch angle value, and the first pitch angle value, including:

[0078] The net power generation weight value K is calculated based on the actual power generation, the maximum power generation value, and the first power generation value. β ,

[0079] Where P is the actual power generation, P0 is the first power generation value, and P1 is the maximum power generation value;

[0080] Calculate the pitch angle clearance weight value K based on the actual pitch angle, minimum pitch angle value, and first pitch angle value. p , Where β is the actual pitch angle, β0 is the minimum pitch angle value, and β1 is the first pitch angle value.

[0081] S4: Calculate the estimated current air clearance level based on the blade tip clearance at power generation, blade tip clearance at pitch angle, power generation clearance weight, and pitch angle clearance weight. This method enables real-time estimation of the blade tip clearance level.

[0082] In this embodiment of the application, the estimated value of the current state clearance level is calculated based on the power generation tip clearance, the pitch angle tip clearance, the power generation clearance weight, and the pitch angle clearance weight, including:

[0083] The estimated value of the current airspace level, TipCl_Es, is calculated using the following formula.

[0084] Where TipCl_P is the tip clearance for power generation, and TipCl_β is the tip clearance for pitch angle.

[0085] The above method can assess the current blade tip clearance level based on simulation data statistics and current wind turbine operating data without adding clearance monitoring equipment, thus saving hardware costs.

[0086] A second aspect of the present invention provides a wind turbine blade tip clearance P1 level estimation system, such as... Figure 5 As shown, it includes:

[0087] The simulation data statistics unit is used to statistically obtain the first relationship curve between headroom and power generation and the second relationship curve between headroom and pitch angle based on the full-condition simulation data. The first relationship curve is the 1st percentile P1 curve of headroom and power generation, and the second relationship curve is the 1st percentile P1 curve of headroom and pitch angle.

[0088] The data acquisition unit is used to acquire the actual power generation value and actual pitch angle of the current wind turbine.

[0089] The weight calculation unit is used to determine the tip clearance of power generation, tip clearance of pitch angle, power clearance weight and pitch angle clearance weight based on the actual power generation value, the actual pitch angle, the first relationship curve and the second relationship curve.

[0090] The clearance estimation unit is used to calculate the estimated value of the current clearance level based on the blade tip clearance of power generation, blade tip clearance of pitch angle, clearance weight of power generation, and clearance weight of pitch angle.

[0091] A third aspect of this invention provides a method for optimizing the tip clearance control of wind turbine blades, such as... Figure 6 As shown, the method includes:

[0092] The estimated value of the current air clearance level is calculated using the aforementioned wind turbine blade tip clearance level P1 estimation method.

[0093] Determine the optimal airspace control strategy based on the estimated current airspace level.

[0094] In this embodiment of the application, determining an airspace optimization control strategy based on an estimated value of the current airspace level includes:

[0095] Obtain the current safe clearance distance, dangerous clearance distance, and optimized preset pitch angle of the wind turbine; wherein the safe clearance distance Cl_H is greater than the dangerous clearance distance Cl_L. In this embodiment, the safe clearance distance, dangerous clearance distance, and optimized preset pitch angle of the wind turbine are determined according to the design parameters of the wind turbine, and the values ​​are different for different turbines.

[0096] Compare the current estimated airspace level, safe airspace distance, and dangerous airspace distance;

[0097] If the estimated current airspace level is greater than the safe airspace distance, no control or protection actions will be taken.

[0098] If the estimated current clearance level is less than the danger clearance distance, the pitch system will retract the pitch to the preset pitch angle to improve the blade tip clearance.

[0099] If the estimated current clearance level is greater than or equal to the hazardous clearance distance and less than or equal to the safe clearance distance, meaning the generator set is currently operating within a potentially hazardous clearance range, then the pitch system will reduce the pitch to the calculated first pitch angle. The first pitch angle is calculated based on the safe clearance distance, the hazardous clearance distance, and the optimized preset pitch angle according to the following formula:

[0100] Where, β c The preset pitch angle is used to optimize the air clearance. Cl_L is the critical air clearance distance, Cl_H is the safe air clearance distance, and TipCl_Es is the estimated value of the current air clearance level. The above method can effectively improve the problem of small tip clearance; it can track power and pitch angle in real time, and reduce the impact of power generation loss while meeting air clearance requirements.

[0101] A fourth aspect of the present invention provides a wind turbine blade tip clearance control system, the system comprising:

[0102] The wind turbine blade tip clearance P1 level estimation system is used to calculate the estimated value of the current clearance level;

[0103] The pitch control system is used to determine the optimal airspace control strategy based on the estimated airspace level for the current state.

[0104] On the other hand, the present invention provides a machine-readable storage medium storing instructions for causing a machine to execute the wind turbine tip clearance P1 level estimation method or the wind turbine tip clearance optimization control method.

[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 estimating the tip clearance P1 of a wind turbine blade, characterized in that, The method includes: Based on the full-condition simulation data, the first relationship curve between headroom and power generation and the second relationship curve between headroom and pitch angle were obtained. The first relationship curve is the 1st percentile P1 curve of headroom and power generation, and the second relationship curve is the 1st percentile P1 curve of headroom and pitch angle. Obtain the current actual power generation value and actual pitch angle of the wind turbine; The tip clearance of power generation, tip clearance of pitch angle, power clearance weight and pitch angle clearance weight are determined based on the actual power generation value, the actual pitch angle, the first relationship curve and the second relationship curve. The estimated value of the current state clearance level is calculated based on the blade tip clearance of power generation, blade tip clearance of pitch angle, clearance weight of power generation, and clearance weight of pitch angle. The following parameters are determined based on the actual power generation value, actual pitch angle, first relationship curve, and second relationship curve: power generation tip clearance, pitch angle tip clearance, power generation clearance weight, and pitch angle clearance weight. Obtain the maximum power generation value and the first power generation value corresponding to the inflection point of the first relationship curve from the first relationship curve; Obtain the minimum pitch angle value and the first pitch angle value corresponding to the inflection point of the second relationship curve from the second relationship curve; Obtain the tip clearance corresponding to the actual power generation from the first relationship curve; Obtain the blade tip clearance corresponding to the actual pitch angle from the second relationship curve; Calculate the power generation net weight and pitch angle net weight based on the actual power generation, actual pitch angle, maximum power generation value, first power generation value, minimum pitch angle value, and first pitch angle value. The power generation clearance weight and pitch angle clearance weight are calculated based on the actual power generation, actual pitch angle, maximum power generation value, first power generation value, minimum pitch angle value, and first pitch angle value, including: Calculate the net power generation weight value based on the actual power generation, the maximum power generation value, and the first power generation value. K β , ,in, P This represents the actual power generation capacity. P 0 represents the first power generation value. P 1 represents the maximum power generation value; Calculate the pitch angle clearance weight value based on the actual pitch angle, minimum pitch angle value, and first pitch angle value. K p , ,in, This is the actual pitch angle. This is the minimum pitch angle value. This is the first pitch angle value.

2. The method for estimating the tip clearance P1 of a wind turbine blade according to claim 1, characterized in that, The estimated current airspace level is calculated based on the blade tip clearance at power generation, blade tip clearance at pitch angle, power generation clearance weight, and pitch angle clearance weight, including: The estimated value of the current airspace level, TipCl_Es, is calculated using the following formula. ,in, TipCl_P To ensure sufficient clearance at the blade tip for power generation, TipCl_ β To ensure clearance at the blade tip and pitch angle.

3. The method for estimating the tip clearance P1 of a wind turbine blade according to claim 1, characterized in that, The first relationship curve between headroom and power generation and the second relationship curve between headroom and pitch angle, obtained from full-condition simulation data, include: The corresponding time sequence of simulated power generation, simulated pitch angle and blade tip clearance is extracted from the full-condition simulation data. The simulated power generation and simulated pitch angle are each divided into multiple intervals at certain intervals; Calculate the leaf tip clearance within each interval; The first relationship curve is obtained by calculating the tip clearance percentile P1 based on the blade tip clearance in each interval of the simulated power generation. The second relationship curve is obtained by calculating the tip clearance percentile P1 based on the simulated blade pitch angle within each interval.

4. A wind turbine blade tip clearance P1 level estimation system, used to implement the wind turbine blade tip clearance P1 level estimation method according to any one of claims 1-3, characterized in that, include: The simulation data statistics unit is used to statistically obtain the first relationship curve between headroom and power generation and the second relationship curve between headroom and pitch angle based on the full-condition simulation data. The first relationship curve is the 1st percentile P1 curve of headroom and power generation, and the second relationship curve is the 1st percentile P1 curve of headroom and pitch angle. The data acquisition unit is used to acquire the actual power generation value and actual pitch angle of the current wind turbine. The weight calculation unit is used to determine the tip clearance of power generation, tip clearance of pitch angle, power clearance weight and pitch angle clearance weight based on the actual power generation value, the actual pitch angle, the first relationship curve and the second relationship curve. The clearance estimation unit is used to calculate the estimated value of the current clearance level based on the blade tip clearance of power generation, blade tip clearance of pitch angle, clearance weight of power generation, and clearance weight of pitch angle.

5. A method for optimizing the clearance at the blade tip of a wind turbine, characterized in that, The method includes: The estimated value of the current state clearance level is calculated using the wind turbine blade tip clearance P1 level estimation method as described in any one of claims 1-3; Determine the optimal airspace control strategy based on the estimated current airspace level.

6. The wind turbine blade tip clearance optimization control method according to claim 5, characterized in that, Based on the estimated current airspace level, determine the airspace optimization control strategy, including: Obtain the current unit's safe clearance distance, dangerous clearance distance, and optimized preset pitch angle. Compare the current estimated airspace level, safe airspace distance, and dangerous airspace distance; If the estimated current airspace level is greater than the safe airspace distance, no control or protection actions will be taken. If the estimated current airspace level is less than the airspace danger distance, the pitch system will retract the pitch to the preset pitch angle. If the estimated current airspace level is greater than or equal to the danger distance and less than or equal to the safe distance, the pitch system retracts the pitch to the calculated first pitch angle; the first pitch angle is calculated based on the safe distance, the danger distance, and the optimized preset pitch angle according to the following formula: ,in, β c The preset pitch angle is used to optimize the airspace, Cl_L is the dangerous airspace distance, Cl_H is the safe airspace distance, and TipCl_Es is the estimated value of the current airspace level.

7. A wind turbine blade tip clearance control system, characterized in that, The system includes: The wind turbine blade tip clearance P1 level estimation system as described in claim 4 is used to calculate the estimated value of the current clearance level. The pitch control system is used to determine the optimal airspace control strategy based on the estimated airspace level for the current state.

8. A machine-readable storage medium storing instructions for causing a machine to perform the wind turbine tip clearance P1 level estimation method according to any one of claims 1-3 or the wind turbine tip clearance optimization control method according to any one of claims 5-6.

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