Quick calibration method and system for blade pitch angle of wind generating set

Abstract

The invention discloses a quick calibration method and system for a blade pitch angle of a wind generating set. The quick calibration method comprises the following steps: S1, setting a reference point and a measurement point; s2, acquiring an absolute inclination angle of each measurement point and a distance between each measurement point and the reference point; s3, calculating a relative pitch angle deviation value of each blade based on a data fusion algorithm; s4, zero offset adjustment is conducted on the corresponding blades; s5, the step S2 to the step S3 are repeatedly executed for verification measurement, and whether the relative pitch angle deviation value of each blade is within a preset range or not is judged; and if not, the step S4 and the verification measurement are executed repeatedly until the relative pitch angle deviation values of all the blades are within the preset range, and calibration is completed. The method has the advantages of high precision, high efficiency, easiness in operation, low cost and the like.

Description

Technical Field

[0001] This invention relates to the technical field of wind power generation, and in particular to a method and system for rapid calibration of the blade pitch angle of a wind turbine generator set. Background Technology

[0002] With the accelerated global energy transition, wind turbine generators are rapidly developing towards larger sizes and greater intelligence. In recent years, the single-unit capacity of wind turbines has continued to break records, with offshore prototypes exceeding 20 megawatts and rotor diameters exceeding 300 meters. This increase in turbine size is accompanied by the "lengthening and flexibility" of blades, meaning a dramatic increase in blade length and flexibility, which presents significant challenges to the manufacturing, installation, and operation and maintenance of wind turbine generators. The blade pitch angle, defined as the angle between the blade's chord length and the rotor's plane of rotation, is a core aerodynamic control parameter. Precise pitch angle control can improve the wind energy capture efficiency of the generator, reduce unbalanced loads, and ensure safe and stable operation.

[0003] With the increasing size of wind turbines, the installation accuracy of the blades, especially the consistency of the pitch angles of the three blades, has become particularly important. Inconsistent blade pitch angles can lead to a series of problems, such as significant power generation loss: the three blades cannot work together at the optimal aerodynamic angle of attack, resulting in a decrease in the wind energy capture efficiency of the unit, a worse power curve, and a continuous loss of power generation revenue; a sharp increase in mechanical load: inconsistent blade pitch angles can lead to aerodynamic imbalance, generating periodic 1P (rotor rotation frequency) loads during rotor rotation, accelerating fatigue damage to key components such as the main shaft, gearbox, and tower, and shortening the design life of the wind turbine; operational instability and safety hazards: aerodynamic imbalance can cause abnormal vibration and noise in the unit, which in turn affects the stability of the control system. In extreme cases, if the blade feathering position is inaccurate, it will severely weaken the aerodynamic braking capability of the unit, directly threatening the safety of the unit.

[0004] After wind turbine installation, blade replacement, or pitch system maintenance, the "zero point" and consistency of the blade pitch angle must be precisely calibrated. However, existing calibration methods have significant shortcomings:

[0005] 1) Reliance on original marking calibration: This method relies on the "zero" baseline marked on the blades and hubs at the factory. However, after transportation, hoisting and long-term operation, these markings are easily worn, contaminated or completely lost, causing the method to fail.

[0006] 2) Reliance on manual measurement: Operators use digital angle meters, which are zeroed with a reference before being transferred to the root of each leaf for measurement. This process is subject to significant human error.

[0007] 3) Adjustment through unit power curve: After the unit has been running for a period of time, the power curve deviation is repeatedly adjusted by observing it. This method has a long commissioning cycle and a large loss of power generation.

[0008] The on-site installation environment of wind turbines is usually quite harsh. Traditional methods that rely on manual experience and simple tools are difficult to guarantee high-precision calibration of long and flexible blades. They cannot meet the requirements of modern wind farms for lean operation and maintenance and high reliability.

[0009] In summary, wind power sites urgently need a rapid blade pitch angle calibration method and system that integrates high precision, high efficiency, ease of operation, and low cost. Summary of the Invention

[0010] The purpose of this invention is to overcome the shortcomings of the prior art and provide a rapid calibration method for the blade pitch angle of wind turbine generator sets, which has the advantages of high precision, high efficiency, easy operation and low cost.

[0011] Another objective of this invention is to provide a rapid calibration system for the blade pitch angle of a wind turbine generator set.

[0012] The objective of this invention is achieved through the following technical solution:

[0013] A method for rapid calibration of blade pitch angle of a wind turbine generator, including the following steps:

[0014] S1. Set a reference point at the center of the front end face of the wind turbine hub or the front end face of the main shaft, ensuring that the reference point coincides with the axis of the main shaft; set measurement points at the same preset position in the root area of ​​each blade of the wind turbine.

[0015] S2. Obtain the absolute tilt angle of each measurement point and the distance of each measurement point relative to the reference point under different preset blade pitch angle positions;

[0016] S3. Based on the absolute tilt angle of each measurement point and the distance of each measurement point relative to the reference point at different preset pitch angle positions of each blade, the relative pitch angle deviation value of each blade is calculated based on the data fusion algorithm.

[0017] S4. Based on the relative pitch angle deviation of each blade, the corresponding blades are adjusted for zero position offset through the main control system of the wind turbine generator set.

[0018] S5. Repeat steps S2 to S3 to perform verification measurements and determine whether the relative pitch angle deviation values ​​of each blade are within the preset range. If yes, the calibration is completed. If not, repeat step S4 and verification measurements until the relative pitch angle deviation values ​​of all blades are within the preset range, and the calibration is completed.

[0019] Furthermore, step S1 includes the following steps:

[0020] When the wind turbine is shut down for maintenance, a reference positioning platform is installed at the center of the front end face of the hub or the front end face of the main shaft. The front end face of the reference positioning platform is used as the reference plane, and the center of the reference plane is used as the reference point. The reference positioning platform is adjusted so that the reference plane is perpendicular to the axis of the main shaft and the reference point coincides with the axis of the main shaft.

[0021] Measurement points are set at the same preset location in the root region of each blade of the wind turbine generator set, and a wireless measurement unit is installed at each measurement point.

[0022] Furthermore, step S3 includes the following steps:

[0023] S3.1, based on the preset pitch angle Calculate the average dip angle of the absolute dip angles of all measurement points. As shown in the following formula:

[0024] ;

[0025] in, To achieve the preset pitch angle Next The absolute inclination angle of the measuring point on the blade; The number of leaves, ;

[0026] S3.2, based on the preset pitch angle Calculate the average distance between all measurement points and the reference point. As shown in the following formula:

[0027] ;

[0028] in, To achieve the preset pitch angle Next The distance between the measuring point of the blade and the reference point;

[0029] S3.3 Calculate the tilt deviation based on the absolute tilt angle and the average tilt angle, as shown in the following formula:

[0030] ;

[0031] in, To achieve the preset pitch angle Next Inclination deviation of the blades;

[0032] S3.4 Calculate the distance deviation based on the distance and the average distance, as shown in the following formula:

[0033] ;

[0034] in, To achieve the preset pitch angle Next The distance deviation of the blades;

[0035] S3.5. Combine the tilt angle deviation and distance deviation according to their weights to obtain the result at the preset pitch angle. The overall deviation of the lower blade is shown in the following formula:

[0036] ;

[0037] in, To achieve the preset pitch angle Next The overall deviation of the blades, This is the weighting coefficient for the tilt angle deviation. This is the weighting coefficient for the distance deviation;

[0038] S3.6. Using the blade with the smallest overall deviation as the reference blade, perform data translation processing on the overall deviations of all blades relative to the reference blade to obtain the estimated pitch angle deviation of each blade relative to the reference blade, as shown in the following formula:

[0039] ;

[0040] ;

[0041] in, To achieve the preset pitch angle The minimum overall deviation is as follows. To achieve the preset pitch angle Next Estimated pitch angle deviation of the support blade relative to the reference blade;

[0042] S3.7 Repeat steps S3.1 to S3.6 to calculate the estimated pitch angle deviation of each blade relative to the corresponding reference blade under different preset pitch angles.

[0043] S3.8. Calculate the final relative pitch angle deviation value based on the estimated pitch angle deviation values ​​of each blade relative to the corresponding reference blade under different preset pitch angles, as shown in the following formula:

[0044] ;

[0045] in, For the first The relative pitch angle deviation of the support blades. The number of preset pitch angles.

[0046] Furthermore, the reference positioning platform includes a central platform and multiple detachable rings. The front end face of the central platform is a reference plane, and a target for use as a reference point is set at the center of the reference plane. Multiple round rods are evenly arranged circumferentially around the outer periphery of the central platform. The number of detachable rings is consistent with the number of round rods and corresponds one-to-one. Each detachable ring is provided with a mounting hole for connecting the corresponding round rod. The detachable ring is installed onto the corresponding round rod through the mounting hole, and adjacent detachable rings are connected by a locking mechanism. Each round rod has a telescopic connecting rod inside, and the end of the telescopic connecting rod is provided with a fixed foot. The reference positioning platform is installed as a whole onto the front end face of the hub or the front end face of the spindle, and the reference plane is perpendicular to the axis of the spindle, and the reference point coincides with the axis of the spindle. Then, the telescopic connecting rod is adjusted so that the fixed foot abuts against the corresponding position of the hub or spindle.

[0047] Furthermore, the detachable ring includes a ring body and a support structure disposed on the inner wall of the ring body, wherein the support structure has a mounting hole at its center for connecting a corresponding circular rod.

[0048] Furthermore, the wireless measurement unit integrates an inclinometer, a rangefinder, a communication module, and a power supply module. The inclinometer and rangefinder are connected to external acquisition devices via the communication module, and the external acquisition devices are connected to the main control system of the wind turbine generator. The power supply module is electrically connected to both the inclinometer and the rangefinder.

[0049] Furthermore, in step S2, the absolute tilt angle of each measurement point is obtained by using an inclinometer, and the distance between each measurement point and the reference point is obtained by using a distance measuring instrument.

[0050] Furthermore, the different preset pitch angles are 0°, 5°, 10°, 15° and 20°.

[0051] Furthermore, the preset range is .

[0052] A rapid calibration system for the blade pitch angle of a wind turbine generator set, used to implement the aforementioned rapid calibration method for the blade pitch angle of a wind turbine generator set, includes...

[0053] A reference positioning platform is installed at the center of the front end face of the wind turbine hub or the front end face of the main shaft to provide a reference point;

[0054] The number of wireless measurement units is consistent with the number of blades and corresponds one-to-one. Each wireless measurement unit is installed at the measurement point in the root region of the corresponding blade to obtain the absolute tilt angle of each measurement point and the distance of each measurement point relative to the reference point.

[0055] External data acquisition devices are connected to the wireless measurement unit and the main control system respectively, and are used to collect data acquired by the wireless measurement unit and transmit the data to the main control system.

[0056] The main control system is used to calculate the relative pitch angle deviation of each blade based on the absolute tilt angle of each measurement point at different preset pitch angle positions and the distance of each measurement point relative to the reference point, and then adjust the zero position offset of the corresponding blades according to the relative pitch angle deviation value of each blade.

[0057] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0058] 1. The calibration and measurement work of this invention is based on a stable reference in the same time and space, and the measurement results have good repeatability and accuracy within 0.05°, with high accuracy and reliability.

[0059] 2. This invention can be installed on a reference surface perpendicular to the main shaft axis, such as the front face of the hub or the front face of the main shaft, according to the actual situation inside the wind turbine hub. The structure is simple and the installation position is flexible.

[0060] 3. This invention is simple to operate and easy to install. After installation, it can simultaneously collect measurement data of the three blades at a specific pitch angle. The entire calibration process takes less time, which greatly reduces the unit's downtime for maintenance and significantly improves calibration efficiency.

[0061] 4. The reference positioning platform of the present invention can be adapted to different specifications of units through telescopic linkage, and the wireless measurement unit adopts mature commercial sensor integration, which has the advantages of low cost, high practicality and easy promotion. Attached Figure Description

[0062] Figure 1 This is a flowchart of the method of the present invention.

[0063] Figure 2 This is a schematic diagram of the installation of the reference positioning platform and wireless measurement unit of the present invention.

[0064] Figure 3 This is a schematic diagram of the reference positioning platform of the present invention installed on the front end face of the wheel hub.

[0065] Figure 4 This is a schematic diagram of the reference positioning platform of the present invention.

[0066] Figure 5 This is a schematic diagram of the structure of the wireless measurement unit of the present invention. Detailed Implementation

[0067] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0068] like Figures 1 to 3 As shown, this embodiment provides a method for rapid calibration of the blade pitch angle of a wind turbine generator, including the following steps:

[0069] S1. Set a reference point at the center of the front end face of the wind turbine hub or the front end face of the main shaft, ensuring that the reference point coincides with the axis of the main shaft; set measurement points at the same preset position in the root region of each blade of the wind turbine; specifically including the following steps:

[0070] When the wind turbine is shut down for maintenance, operators may enter the hub to perform calibration work only after the rotor is reliably locked. At the same time, a dedicated monitoring person should be assigned to promptly remind the operators inside the hub to evacuate in case of high wind speed or emergencies.

[0071] A reference positioning platform 1 is installed at the center of the front end face of the hub or the front end face of the main shaft of the wind turbine generator set. The front end face of the reference positioning platform 1 is used as the reference plane, and the center of the reference plane is used as the reference point. The reference positioning platform 1 is adjusted so that the reference plane is perpendicular to the axis of the main shaft and the reference point coincides with the axis of the main shaft.

[0072] Measurement points are set at the same preset position in the root area of ​​each blade of the wind turbine generator set, and a wireless measurement unit 2 is installed at each measurement point to ensure that the position is uniform and the unit is firmly fixed.

[0073] S2. Obtain the absolute tilt angle of each measurement point and the distance of each measurement point relative to the reference point at different preset pitch angle positions of each blade. In this embodiment, the different preset pitch angles are 0°, 5°, 10°, 15° and 20°. First, start the measurement at the 0° pitch angle, stop at each pitch angle and collect 10 sets of data to reduce random errors.

[0074] S3. Based on the absolute tilt angle of each measurement point at different preset pitch angle positions of each blade and the distance of each measurement point relative to the reference point, calculate the relative pitch angle deviation value of each blade using a data fusion algorithm; specifically including the following steps:

[0075] S3.1, based on the preset pitch angle Calculate the average dip angle of the absolute dip angles of all measurement points. As shown in the following formula:

[0076] ;

[0077] in, To achieve the preset pitch angle Next The absolute inclination angle of the measuring point on the blade; The number of leaves, ;

[0078] S3.2, based on the preset pitch angle Calculate the average distance between all measurement points and the reference point. As shown in the following formula:

[0079] ;

[0080] in, To achieve the preset pitch angle Next The distance between the measuring point of the blade and the reference point;

[0081] S3.3 Calculate the tilt deviation based on the absolute tilt angle and the average tilt angle, as shown in the following formula:

[0082] ;

[0083] in, To achieve the preset pitch angle Next Inclination deviation of the blades;

[0084] S3.4 Calculate the distance deviation based on the distance and the average distance, as shown in the following formula:

[0085] ;

[0086] in, To achieve the preset pitch angle Next The distance deviation of the blades;

[0087] S3.5. Combine the tilt angle deviation and distance deviation according to their weights to obtain the result at the preset pitch angle. The overall deviation of the lower blade is shown in the following formula:

[0088] ;

[0089] in, To achieve the preset pitch angle Next Overall deviation of the blades; The weighting coefficient for tilt angle deviation is 1. Since the tilt angle is directly measured by the orientation of the blade surface and is directly related to the pitch angle, it is usually set as the main weight. The weighting coefficient for distance deviation is 0.05 to 0.2. Distance measurement reflects changes in geometric position and requires comprehensive consideration of measurement sensitivity and distance from the measuring point to the blade axis. In practical applications, the weighting coefficient for distance deviation is usually taken as 0.05 to 0.2.

[0090] S3.6. Using the blade with the smallest overall deviation as the reference blade, perform data translation processing on the overall deviations of all blades relative to the reference blade to obtain the estimated pitch angle deviation of each blade relative to the reference blade, as shown in the following formula:

[0091] ;

[0092] ;

[0093] in, To achieve the preset pitch angle The minimum overall deviation is as follows. To achieve the preset pitch angle Next Estimated pitch angle deviation of the support blade relative to the reference blade;

[0094] S3.7 Repeat steps S3.1 to S3.6 to calculate the estimated pitch angle deviation of each blade relative to the corresponding reference blade under different preset pitch angles.

[0095] S3.8. Calculate the final relative pitch angle deviation value based on the estimated pitch angle deviation values ​​of each blade relative to the corresponding reference blade under different preset pitch angles, as shown in the following formula:

[0096] ;

[0097] in, For the first The relative pitch angle deviation of the support blades. The number of preset pitch angles.

[0098] S4. Based on the relative pitch angle deviation of each blade, the corresponding blades are adjusted to zero position offset through the main control system of the wind turbine generator.

[0099] S5. Repeat steps S2 to S3 to perform verification measurements and determine whether the relative pitch angle deviation values ​​of each blade are all within the preset range. In this embodiment, the preset range is set to... If yes, then the calibration is complete; if not, repeat step S4 and verification measurement until the relative pitch angle deviation values ​​of all blades are within the preset range, and the calibration is complete; finally, disassemble the reference positioning platform 1 and the wireless measurement unit 2, check the site, and remove the hub after ensuring that nothing is missed.

[0100] like Figure 4 As shown, the reference positioning platform 1 includes a central platform 101 and multiple detachable rings 102. The front end face of the central platform 101 is a reference plane, and a target 103 for use as a reference point is provided at the center of the reference plane. Multiple round rods 104 are evenly arranged circumferentially around the outer periphery of the central platform 101. The number of detachable rings 102 corresponds to the number of round rods 104. Each detachable ring 102 has a mounting hole for connecting the corresponding round rod 104. 2. Install the corresponding round rod 104 through the mounting hole, and connect adjacent detachable rings 102 through the locking mechanism 105. Each round rod 104 is provided with a telescopic connecting rod 106 inside, and the end of the telescopic connecting rod 106 is provided with a fixed foot 107. Install the reference positioning platform 1 as a whole onto the front end face of the hub or the front end face of the spindle, and make the reference plane perpendicular to the axis of the spindle, and the reference point coincides with the axis of the spindle. Then adjust the telescopic connecting rod 106 so that the fixed foot 107 abuts against the corresponding position of the hub or spindle.

[0101] Furthermore, the detachable ring 102 includes a ring body and a support structure 1021 disposed on the inner wall of the ring body. The support structure 1021 has a mounting hole at its center for connecting the corresponding round rod 104.

[0102] like Figure 5 As shown, the outer casing of the wireless measurement unit 2 is equipped with an indicator light 201 and a switch button 202. It integrates an inclinometer, a rangefinder, a communication module, and a power supply module. The inclinometer and the rangefinder are connected to an external acquisition device through the communication module. The external acquisition device is connected to the main control system of the wind turbine generator. The power supply module is electrically connected to the inclinometer and the rangefinder. The inclinometer obtains the absolute inclinometer of each measurement point, and the rangefinder obtains the distance of each measurement point relative to the reference point.

[0103] This embodiment also provides a rapid calibration system for the blade pitch angle of a wind turbine generator set, used to implement the aforementioned rapid calibration method for the blade pitch angle of a wind turbine generator set, including...

[0104] The reference positioning platform 1 is installed at the center of the front end face of the hub or the front end face of the main shaft of the wind turbine generator set to provide a reference point;

[0105] The number of wireless measurement units 2 is consistent with the number of blades and corresponds one-to-one. Each wireless measurement unit 2 is installed at the measurement point in the root region of the corresponding blade to obtain the absolute tilt angle of each measurement point and the distance of each measurement point relative to the reference point.

[0106] An external data acquisition device is connected to both the wireless measurement unit 2 and the main control system to collect data from the wireless measurement unit and transmit it to the main control system. It can be handheld to improve ease of operation.

[0107] The main control system is used to calculate the relative pitch angle deviation of each blade based on the absolute tilt angle of each measurement point at different preset pitch angle positions and the distance of each measurement point relative to the reference point, and then adjust the zero position offset of the corresponding blades according to the relative pitch angle deviation value of each blade.

[0108] This invention establishes a reference point inside the hub that coincides with the main shaft axis, synchronously and automatically collects the tilt angle data of the three blades and the distance data of each blade relative to the reference point, and calculates the relative pitch angle deviation value of each blade by combining the data fusion algorithm. Based on the deviation value, the blades are adjusted to zero position offset, thereby significantly improving the efficiency and accuracy of blade calibration.

[0109] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope disclosed in the present invention, based on the technical solution and inventive concept of the present invention, shall fall within the scope of protection of the present invention.

Claims

1. A method for rapid calibration of the blade pitch angle of a wind turbine generator set, characterized in that: Including steps, S1. Set a reference point at the center of the front end face of the wind turbine hub or the front end face of the main shaft, ensuring that the reference point coincides with the axis of the main shaft; set measurement points at the same preset position in the root area of ​​each blade of the wind turbine. S2. Obtain the absolute tilt angle of each measurement point and the distance of each measurement point relative to the reference point under different preset blade pitch angle positions; S3. Based on the absolute tilt angle of each measurement point and the distance of each measurement point relative to the reference point at different preset pitch angle positions of each blade, the relative pitch angle deviation value of each blade is calculated based on the data fusion algorithm. S4. Based on the relative pitch angle deviation of each blade, the corresponding blades are adjusted for zero position offset through the main control system of the wind turbine generator set. S5. Repeat steps S2 to S3 to perform verification measurements and determine whether the relative pitch angle deviation values ​​of each blade are within the preset range. If yes, the calibration is completed. If not, repeat step S4 and verification measurements until the relative pitch angle deviation values ​​of all blades are within the preset range, and the calibration is completed.

2. The method for rapid calibration of blade pitch angle of a wind turbine generator as described in claim 1, characterized in that: Step S1 includes the following steps: When the wind turbine is shut down for maintenance, a reference positioning platform is installed at the center of the front end face of the hub or the front end face of the main shaft. The front end face of the reference positioning platform is used as the reference plane, and the center of the reference plane is used as the reference point. Adjust the reference positioning platform so that the reference plane is perpendicular to the axis of the spindle and the reference point coincides with the axis of the spindle; Measurement points are set at the same preset location in the root region of each blade of the wind turbine generator set, and a wireless measurement unit is installed at each measurement point.

3. The method for rapid calibration of blade pitch angle of a wind turbine generator as described in claim 1, characterized in that: Step S3 Includes the following steps, S3.1, based on the preset pitch angle Calculate the average dip angle of the absolute dip angles of all measurement points. As shown in the following formula: ； in, To achieve the preset pitch angle Next The absolute inclination angle of the measuring point on the blade; The number of leaves, ; S3.2, based on the preset pitch angle Calculate the average distance between all measurement points and the reference point. As shown in the following formula: ； in, To achieve the preset pitch angle Next The distance between the measuring point of the blade and the reference point; S3.3 Calculate the tilt deviation based on the absolute tilt angle and the average tilt angle, as shown in the following formula: ； in, To achieve the preset pitch angle Next Inclination deviation of the blades; S3.4 Calculate the distance deviation based on the distance and the average distance, as shown in the following formula: ； in, To achieve the preset pitch angle Next The distance deviation of the blades; S3.

5. Combine the tilt angle deviation and distance deviation according to their weights to obtain the result at the preset pitch angle. The overall deviation of the lower blade is shown in the following formula: ； in, To achieve the preset pitch angle Next The overall deviation of the blades, This is the weighting coefficient for the tilt angle deviation. This is the weighting coefficient for the distance deviation; S3.

6. Using the blade with the smallest overall deviation as the reference blade, perform data translation processing on the overall deviations of all blades relative to the reference blade to obtain the estimated pitch angle deviation of each blade relative to the reference blade, as shown in the following formula: ； ； in, To achieve the preset pitch angle The minimum overall deviation is as follows. To achieve the preset pitch angle Next Estimated pitch angle deviation of the support blade relative to the reference blade; S3.7 Repeat steps S3.1 to S3.6 to calculate the estimated pitch angle deviation of each blade relative to the corresponding reference blade under different preset pitch angles. S3.

8. Calculate the final relative pitch angle deviation value based on the estimated pitch angle deviation values ​​of each blade relative to the corresponding reference blade under different preset pitch angles, as shown in the following formula: ； in, For the first The relative pitch angle deviation of the support blades. The number of preset pitch angles.

4. The method for rapid calibration of blade pitch angle of a wind turbine generator as described in claim 2, characterized in that: The reference positioning platform includes a central platform and multiple detachable rings. The front end face of the central platform is a reference plane, and a target for use as a reference point is set at the center of the reference plane. Multiple round rods are evenly arranged circumferentially around the outer periphery of the central platform. The number of detachable rings corresponds to the number of round rods. Each detachable ring has a mounting hole for connecting to the corresponding round rod. The detachable ring is installed onto the corresponding round rod through the mounting hole, and adjacent detachable rings are connected by a locking mechanism. Each round rod has a telescopic connecting rod inside, and the end of the telescopic connecting rod is provided with a fixed foot. The reference positioning platform is installed as a whole onto the front end face of the wheel hub or the front end face of the main shaft, and the reference plane is perpendicular to the axis of the main shaft, and the reference point coincides with the axis of the main shaft. Then, the telescopic connecting rod is adjusted so that the fixed foot abuts against the corresponding position of the wheel hub or the main shaft.

5. The method for rapid calibration of the blade pitch angle of a wind turbine generator as described in claim 4, characterized in that: The detachable ring includes a ring body and a support structure disposed on the inner wall of the ring body. The support structure has a mounting hole at its center for connecting a corresponding circular rod.

6. The method for rapid calibration of blade pitch angle of a wind turbine generator as described in claim 2, characterized in that: The wireless measurement unit integrates an inclinometer, a rangefinder, a communication module, and a power supply module. The inclinometer and rangefinder are connected to external acquisition devices via the communication module, and the external acquisition devices are connected to the main control system of the wind turbine generator. The power supply module is electrically connected to both the inclinometer and the rangefinder.

7. The method for rapid calibration of blade pitch angle of a wind turbine generator as described in claim 6, characterized in that: In step S2, the absolute tilt angle of each measurement point is obtained by using an inclinometer, and the distance between each measurement point and the reference point is obtained by using a distance meter.

8. The method for rapid calibration of blade pitch angle of a wind turbine generator according to claim 1, characterized in that: The different preset pitch angles are 0°, 5°, 10°, 15° and 20°.

9. The method for rapid calibration of blade pitch angle of a wind turbine generator as described in claim 1, characterized in that: The preset range is .

10. A rapid calibration system for the blade pitch angle of a wind turbine generator set, characterized in that: This method is used to implement the rapid calibration method for the blade pitch angle of a wind turbine generator as described in any one of claims 1 to 9. include, A reference positioning platform is installed at the center of the front end face of the wind turbine hub or the front end face of the main shaft to provide a reference point; The number of wireless measurement units is consistent with the number of blades and corresponds one-to-one. Each wireless measurement unit is installed at the measurement point in the root region of the corresponding blade to obtain the absolute tilt angle of each measurement point and the distance of each measurement point relative to the reference point. External data acquisition devices are connected to the wireless measurement unit and the main control system respectively, and are used to collect data acquired by the wireless measurement unit and transmit the data to the main control system. The main control system is used to calculate the relative pitch angle deviation of each blade based on the absolute tilt angle of each measurement point at different preset pitch angle positions and the distance of each measurement point relative to the reference point, and then adjust the zero position offset of the corresponding blades according to the relative pitch angle deviation value of each blade.

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