Variable pitch control method and device of wind turbine generator, terminal and medium

Abstract

The embodiment of the invention relates to the technical field of wind power generation and wind power control, and provides a variable pitch control method and device of a wind turbine generator, a terminal and a medium. The method comprises the steps that initial blade vibration information and blade load information of a to-be-detected blade of the wind turbine generator are collected; determining reference blade vibration information according to the blade load information; correcting the initial blade vibration information by adopting the reference blade vibration information to obtain target blade vibration information; generating variable pitch control information according to the target blade vibration information and the operation information of the wind turbine generator; variable pitch control is carried out on the wind turbine generator by adopting the variable pitch control information, the initial blade vibration information and the blade load information of the to-be-detected blade of the wind turbine generator can be simultaneously carried out, more accurate blade vibration information is determined by combining the initial blade vibration information and the blade load information, and variable pitch control is carried out by adopting the blade vibration information; and the accuracy of variable pitch control is improved.

Description

Technical Field

[0001] The present application relates to the technical field of wind power generation and wind power control, and in particular to a method, device, terminal and medium for variable pitch control of a wind turbine. Background Art

[0002] With the rapid development of wind power generation technology, the scale and power of wind turbines are increasing. As the key components of wind turbines, blades are subjected to complex loads and vibrations during operation. Accurately monitoring the vibration and load status of blades is of great significance to ensure the safe operation of wind turbines, improve power generation efficiency, and reduce maintenance costs.

[0003] However, the blade vibration monitoring method and load monitoring method in existing wind turbines are usually independent of each other, and it is difficult to fully and accurately reflect the actual working state of the blades, resulting in low accuracy when using vibration data and load data for pitch control. Summary of the invention

[0004] The embodiments of the present application provide a pitch control method, device, terminal and medium for a wind turbine set, which can simultaneously obtain the initial blade vibration information and blade load information of the blades to be detected of the wind turbine set, and determine more accurate blade vibration information in combination with the initial blade vibration information and the blade load information, and use the blade vibration information to perform pitch control, thereby improving the accuracy of pitch control.

[0005] A first aspect of an embodiment of the present application provides a pitch control method for a wind turbine generator set, the method comprising:

[0006] Collecting initial blade vibration information and blade load information of the blades to be tested of the wind turbine generator set;

[0007] determining reference blade vibration information according to the blade load information;

[0008] Using the reference blade vibration information to correct the initial blade vibration information to obtain target blade vibration information;

[0009] Generate pitch control information according to the target blade vibration information and the operation information of the wind turbine generator set;

[0010] The pitch control information is used to perform pitch control on the wind turbine generator set.

[0011] In this example, by collecting the initial blade vibration information and blade load information of the blades to be detected of the wind turbine, reference blade vibration information is determined according to the blade load information, and the initial blade vibration information is corrected using the reference blade vibration information to obtain target blade vibration information, and pitch control information is generated according to the target blade vibration information and the operating information of the wind turbine, and the pitch control of the wind turbine is performed using the pitch control information. Therefore, the initial blade vibration information and blade load information of the blades to be detected of the wind turbine can be obtained at the same time, and more accurate blade vibration information can be determined in combination with the initial blade vibration information and the blade load information, and the blade vibration information is used for pitch control, thereby improving the accuracy of pitch control.

[0012] A second aspect of an embodiment of the present application provides a pitch control device for a wind turbine generator set, the device comprising:

[0013] A collection unit, used for collecting initial blade vibration information and blade load information of the blade to be tested of the wind turbine;

[0014] a determination unit, configured to determine reference blade vibration information according to the blade load information;

[0015] a correction processing unit, configured to perform correction processing on the initial blade vibration information using the reference blade vibration information to obtain target blade vibration information;

[0016] A generating unit, configured to generate pitch control information according to the target blade vibration information and the operation information of the wind turbine generator set;

[0017] A control unit is used to perform pitch control on the wind turbine generator set using the pitch control information.

[0018] A third aspect of an embodiment of the present application provides a terminal, comprising a processor, an input device, an output device and a memory, wherein the processor, input device, output device and memory are interconnected, wherein the memory is used to store a computer program, the computer program comprises program instructions, and the processor is configured to call the program instructions to execute the step instructions in the first aspect of the embodiment of the present application.

[0019] The fourth aspect of the embodiments of the present application provides a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program for electronic data exchange, wherein the computer program enables a computer to execute part or all of the steps described in the first aspect of the embodiments of the present application.

[0020] A fifth aspect of the embodiments of the present application provides a computer program product, wherein the computer program product includes a non-transitory computer-readable storage medium storing a computer program, and the computer program is operable to cause a computer to execute some or all of the steps described in the first aspect of the embodiments of the present application. The computer program product may be a software installation package. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 A schematic diagram of the setting of a sensor is provided for an embodiment of the present application;

[0023] Figure 2 A flow chart of a pitch control method for a wind turbine generator system is provided for an embodiment of the present application;

[0024] Figure 3 A schematic diagram of the structure of a terminal provided in an embodiment of the present application;

[0025] Figure 4 A structural schematic diagram of a pitch control device for a wind turbine generator system is provided for an embodiment of the present application. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0027] The terms "first", "second", etc. in the specification and claims of this application and the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not limited to the listed steps or units, but optionally includes steps or units that are not listed, or optionally includes other steps or units inherent to these processes, methods, products or devices.

[0028] Reference to "embodiments" in this application means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described in this application may be combined with other embodiments.

[0029] In order to better understand the pitch control method of a wind turbine provided in the embodiment of the present application, the pitch control system of the wind turbine using the pitch control method is briefly introduced below. The pitch control system includes a fiber grating acceleration sensor and a fiber grating strain sensor installed at a specific position of the blade to monitor the blade, and uses a coupler to couple data in a series / parallel manner. The frequency division multiplexing method can be used to divide the spectrum resources into multiple different frequency bands, and each frequency band is allocated to different signals for simultaneous transmission. Finally, after being analyzed by a fiber grating demodulator, it is directly transmitted to the unit main control system (PLC). The unit control system performs subsequent pitch control based on the collected blade vibration information and blade load information.

[0030] Specifically, the fiber Bragg grating vibration sensor is installed on the windward side of the wind turbine at one-third of the distance from the blade root, and the fiber Bragg grating strain sensor is installed at 2-3 meters from the blade root (±45° of the mold line). The fiber Bragg grating vibration sensor obtains blade vibration data, and the fiber Bragg grating strain sensor obtains blade load data, such as Figure 1 As shown;

[0031] The collected blade vibration information and blade load information are coupled by a coupler in series / parallel mode, and uploaded to the unit main control system through the CANOpen communication protocol after being analyzed by the demodulator, ensuring the stability and reliability of data transmission.

[0032] See also Figure 2 , Figure 2 The present invention provides a flow chart of a pitch control method for a wind turbine generator set. Figure 2 As shown, the method is applied to a pitch control system, and the method includes:

[0033] 201. Collect initial blade vibration information and blade load information of a blade to be tested of a wind turbine generator set.

[0034] Among them, data can be collected through the fiber Bragg grating vibration sensor in the pitch control system to obtain initial blade vibration information, and blade load data can be obtained through the fiber Bragg grating strain sensor.

[0035] The blade load information includes blade root swing load, blade swing direction vibration acceleration, blade root flap load and blade flap direction vibration acceleration.

[0036] After collecting the initial blade vibration information and blade load information, the pitch control system can also be automatically calibrated and calibrated. Specifically, it can be:

[0037] (1) Turn on the automatic calibration function. When the wind turbine is in standby mode, the turbine will automatically yaw to calibrate the wind. When the average wind speed is 1m≤10 minutes or ≤4m, the turbine will enter the calibration mode. When the average wind speed is 1m>10 minutes or >4m, the turbine will exit the calibration mode and enter standby or power generation mode.

[0038] (2) During the calibration process, the pitch angles of the three blades are changed to 70°, 50°, and 30° for 5 turns respectively, and the calibration data is recorded at the same time. The calibration is completed and the blade is cut out;

[0039] (3) During the automatic calibration process, the load sensor wavelength, vibration, wind speed, rotation speed, rotor speed, azimuth angle, pitch angle and other data are recorded and saved;

[0040] (4) Combine blade parameters with calibration data to perform load calculation;

[0041] (5) The calibration coefficients generated are in a unified format and implanted into the main control system to complete automatic calibration and calibration;

[0042] (6) The calibrated vibration and load data are preprocessed through the online analysis system by methods such as denoising, normalization, data segmentation, outlier processing, and trend removal.

[0043] 202. Determine reference blade vibration information according to the blade load information.

[0044] A summary of the current status of industry condition monitoring technology and blade failure cases shows that when a minor fault occurs at the blade tip (far away from the sensor installation location), it is difficult for the vibration sensor to effectively extract the natural frequency; when a more serious fault occurs at the blade, the blade load and vibration acceleration can both extract changes in the natural frequency.

[0045] In a specific implementation, the determining of the reference blade vibration information according to the blade load information may be:

[0046] A1. determining a first vibration acceleration according to the blade root swing load;

[0047] The determining of the first vibration acceleration according to the blade root shimmy load may specifically be:

[0048] A11, filtering the blade root oscillation load to obtain a first reference blade root oscillation load;

[0049] A12. Perform a derivative operation on the first reference blade root swing load to obtain the first vibration acceleration.

[0050] Specifically, the blade root swing load may be filtered by a bandpass filter, and the filtering frequency band of the bandpass filter is set by empirical values ​​or historical data.

[0051] The first reference blade root oscillation load may be differentiated once to obtain vibration velocity information, and the vibration velocity may be detrended to obtain vibration velocity information; the vibration velocity information may be differentiated twice to obtain a first vibration acceleration. The first vibration acceleration may be characterized by a vibration acceleration waveform.

[0052] A2. acquiring a first vibration acceleration corresponding to blade root vibration according to the blade vibration direction vibration acceleration and the first vibration acceleration;

[0053] The step of obtaining the first vibration acceleration corresponding to the blade root swing according to the blade swing direction vibration acceleration and the first vibration acceleration may specifically include:

[0054] A21. Performing spectrum and envelope analysis on the acceleration waveform curve corresponding to the first vibration acceleration to obtain a first reference natural frequency;

[0055] A22, performing spectrum and envelope analysis on the acceleration waveform curve corresponding to the vibration acceleration in the swing direction of the blade to obtain a second reference natural frequency;

[0056] A23. If the frequency difference between the first reference natural frequency and the second reference natural frequency is less than a preset frequency difference threshold, amplifying the acceleration waveform curve corresponding to the first vibration acceleration according to a preset amplification factor to obtain a first acceleration waveform curve;

[0057] A24. Calculate the vibration acceleration according to the first acceleration waveform curve to obtain the first vibration acceleration.

[0058] Among them, a general spectrum and envelope analysis processing method can be used to process the acceleration waveform curve corresponding to the vibration acceleration in the blade swing direction and the acceleration waveform curve corresponding to the vibration acceleration in the blade swing direction to obtain the corresponding first reference natural frequency and second reference natural frequency.

[0059] The acceleration waveform curve corresponding to the first vibration acceleration is amplified according to a preset amplification factor. The method for obtaining the first acceleration waveform curve may be to multiply the acceleration waveform curve corresponding to the first vibration acceleration by a preset amplification factor to perform amplification processing. The preset amplification factor is set by an empirical value or historical data.

[0060] If the frequency difference between the first reference natural frequency and the second reference natural frequency is greater than a preset frequency difference threshold, the first acceleration waveform curve cannot be used to calculate the vibration acceleration to obtain the first vibration acceleration, and therefore, no relevant correction processing is required.

[0061] Since there is a certain correlation between the vibration of the blade and the load of the blade, the vibration acceleration can be calculated according to the first acceleration waveform curve to obtain the first vibration acceleration.

[0062] A3. determining a second vibration acceleration at least according to the blade root swing load;

[0063] The determining of the second vibration acceleration at least according to the blade root shimmy load may specifically be:

[0064] A31. Determine a method for obtaining the vibration acceleration corresponding to the blade root swing load according to the rotor speed of the generator set and the pitch angle of the generator set;

[0065] A32. Process the blade root swing load using the vibration acceleration acquisition method corresponding to the blade root swing load to obtain a second vibration acceleration.

[0066] The vibration acceleration acquisition method includes method 1 and method 2. Specifically, method 1 may be:

[0067] The blade root swing load is smoothed and detrended, and then further processed using a bandpass filter, followed by a primary derivative and detrending process, and finally a secondary derivative to obtain the second vibration acceleration;

[0068] Method 2 can be:

[0069] A bandpass filter is used for further processing, followed by a first derivative and detrending process, and finally a second derivative to obtain the second vibration acceleration.

[0070] If the rotor speed of the generator set is full and the pitch angle of the generator set is constant, method 2 is used to process the blade root swing load to obtain the second vibration acceleration; otherwise, method 1 is used to process the blade root swing load to obtain the second vibration acceleration.

[0071] A4. acquiring a second vibration acceleration corresponding to blade root swing according to the blade flapping direction vibration acceleration and the second vibration acceleration;

[0072] The blade flapping direction vibration acceleration is filtered by a bandpass filter to obtain the blade flapping direction vibration acceleration after filtering. The passband of the bandpass filter is the same as the passband of the aforementioned bandpass filter.

[0073] The filtered blade swing direction vibration acceleration and the second vibration acceleration are subjected to FFT or Hilbert analysis, and then the natural frequency of the acceleration waveform corresponding to the filtered blade swing direction vibration acceleration and the natural frequency of the acceleration waveform corresponding to the second vibration acceleration are extracted; if the two natural frequencies are the same or the frequency difference is less than a preset frequency difference threshold, the acceleration waveform corresponding to the second vibration acceleration is multiplied by a preset coefficient to obtain a new acceleration waveform, and finally the acceleration waveform is used for inversion to obtain the second vibration acceleration.

[0074] A5. Determine the reference blade vibration information according to the first vibration acceleration and the second vibration acceleration.

[0075] Finally, the first vibration acceleration and the second vibration acceleration may be determined as reference blade vibration information.

[0076] 203. Use the reference blade vibration information to perform correction processing on the initial blade vibration information to obtain target blade vibration information.

[0077] A general correction processing method can be used to correct the initial blade vibration information using reference blade vibration information to obtain target blade vibration information. Specifically, a weighted operation method, a mean operation method, etc. can be used for correction processing to obtain target blade vibration information.

[0078] 204. Generate pitch control information according to the target blade vibration information and the operation information of the wind turbine generator set.

[0079] The generating of the pitch control information according to the target blade vibration information and the operation information of the wind turbine generator set may specifically be:

[0080] B1. determining the full-field wind turbulence intensity of the wind field where the wind turbine is located according to the target blade vibration information and the operation information of the wind turbine;

[0081] B2. Determine pitch control information according to the overall wind turbulence intensity.

[0082] According to the data such as intelligent equipment, rotation speed, wind speed, pitch angle, etc. obtained by the main control during the actual operation of the wind turbine, in order to cope with the problems such as wind uncertainty and difficulty in real-time and accurate calculation of turbulence intensity during actual operation, combined with the blade vibration and load fusion monitoring method and advanced intelligent sensing equipment and the powerful algorithm and computing power support of the field control platform, the wind turbulence intensity of the entire field can be calculated in real time, and the wind turbine variable pitch adaptive control can be performed through the field control platform to improve the power generation efficiency of the wind turbine while ensuring the safety of the unit.

[0083] Specifically, the operation information of the wind turbine may include data such as intelligent devices, rotation speed, wind speed, pitch angle, etc. A general turbulence intensity calculation method may be used to determine the full-field wind turbulence intensity of the wind farm where the wind turbine is located according to the target blade vibration information and the operation information of the wind turbine. A general pitch control information determination method may be used to determine the pitch control information according to the full-field wind turbulence intensity.

[0084] 205. Use the pitch control information to perform pitch control on the wind turbine generator set.

[0085] In this example, by collecting the initial blade vibration information and blade load information of the blades to be detected of the wind turbine, reference blade vibration information is determined according to the blade load information, and the initial blade vibration information is corrected using the reference blade vibration information to obtain target blade vibration information, and pitch control information is generated according to the target blade vibration information and the operating information of the wind turbine, and the pitch control of the wind turbine is performed using the pitch control information. Therefore, the initial blade vibration information and blade load information of the blades to be detected of the wind turbine can be obtained at the same time, and more accurate blade vibration information can be determined in combination with the initial blade vibration information and the blade load information, and the blade vibration information is used for pitch control, thereby improving the accuracy of pitch control.

[0086] In a specific implementation, the embodiment of the present application provides another pitch control method for a wind turbine generator set, specifically:

[0087] C1. Obtain blade vibration data and blade load data by installing a fiber Bragg grating vibration sensor on the windward side of the wind turbine at one-third of the distance from the blade root and a fiber Bragg grating strain sensor at 2-3 meters from the blade root (±45° from the mold line), such as Figure 1 As shown;

[0088] C2. The collected vibration data and load data are coupled by a coupler in series / parallel mode, and uploaded to the unit main control system through the CANOpen communication protocol after being analyzed by the demodulator to ensure the stability and reliability of data transmission;

[0089] C3. Automatically calibrate and calibrate the blade vibration and load monitoring system using the rich unit data of the main control system, and process the data through the online analysis system;

[0090] Among them, the automatic calibration is enabled, and the unit is in standby state, and the unit automatically yaws to calibrate the wind. When the average wind speed is 1m≤10 minutes≤4m, the unit enters the calibration mode, and when the average wind speed is 1m>10 minutes>4m, the calibration mode is cut out, and the unit is in standby or generating electricity; during the calibration process, the pitch angles of the three blades are changed, and the pitch angles of the three blades are rotated for 5 circles at 70°, 50°, and 30° respectively, and the calibration data is recorded at the same time, and the calibration is completed and cut out; during the automatic calibration process, the load sensor wavelength, vibration, wind speed, speed, rotor speed, azimuth, pitch angle and other data are recorded and saved; the load is calculated by combining the blade parameters and calibration data; the generated calibration coefficients are in a unified format and implanted into the main control system to complete the automatic calibration and calibration; the vibration and load data after calibration are pre-processed by the online analysis system through denoising, normalization, data segmentation, outlier processing, trend removal and other methods.

[0091] C4. Use feature extraction algorithm to extract key features from pre-processed vibration data and load data respectively, and use data fusion algorithm to establish blade status assessment model to achieve more accurate assessment and control of blade status;

[0092] Among them, the inversion of load data to vibration data and the natural frequency as a monitoring indicator are widely used in blade damage monitoring, etc. The current status of industry status monitoring technology and blade failure cases are summarized. When a minor failure occurs at the blade tip (far away from the sensor installation position), it is difficult for the vibration sensor to effectively extract the natural frequency; when a serious failure occurs at the blade, the blade load and vibration acceleration can both extract the change in natural frequency. Based on this, the blade load inversion waveform (secondary derivative, equivalent to vibration acceleration) is used to extract the blade natural frequency, and the correlation between the blade load waveform and the vibration acceleration waveform is demonstrated. The accuracy of the fusion data is verified by the correlation between the blade load and vibration.

[0093] The feature extraction method is used to select the most valuable features for blade condition assessment from the extracted vibration and load features.

[0094] By analyzing and refining the blade vibration and load data, partial data support is provided for the intelligent control algorithm of the field control platform, and real-time blade status data is provided for the online analysis system, which further improves the accuracy of blade status assessment. It also provides strong guarantees for the implementation of turbulence identification adaptive pitch control technology, blade vibration and load inversion key component safety monitoring technology.

[0095] C5. Combine the rich unit data of the main control system and the real-time data fusion algorithm to perform independent pitch control on the unit, reduce unit vibration and reduce unit fatigue loss;

[0096] Among them, according to the data such as intelligent equipment, rotation speed, wind speed, pitch angle, etc. obtained by the main control during the actual operation of the wind turbine, in order to cope with the uncertainty of wind and the difficulty of real-time and accurate calculation of turbulence intensity during actual operation, combined with the blade vibration and load fusion monitoring method and advanced intelligent sensing equipment and the powerful algorithm and computing power support of the field control platform, the wind turbulence intensity of the entire field can be calculated in real time, and the wind turbine pitch adaptive control can be carried out through the field control platform to improve the power generation efficiency of the wind turbine while ensuring the safety of the unit.

[0097] According to the load risks brought by the over-design wind conditions in the actual operation of wind farms, a load inversion model for key components is established in combination with blade vibration and load fusion monitoring technology. A safety monitoring technology based on blade vibration and load inversion is proposed. The loads of key components of the unit are inverted using panoramic data such as blade vibration and load, which can realize unit life prediction and intervention control of key component loads. It can extend the actual operating life of the unit and improve the safety and reliability of wind turbines.

[0098] C6. The fusion method of blade vibration and load monitoring can provide data support for the control algorithm of the field control platform. In terms of improving wind power efficiency and ensuring unit safety, the precise and stable data of the monitoring fusion technology can provide a strong guarantee for the implementation of turbulence identification adaptive pitch control technology, blade vibration and load inversion key component safety monitoring technology.

[0099] For the above embodiments, please refer to Figure 3 , Figure 3 A schematic diagram of the structure of a terminal provided in an embodiment of the present application, such as Figure 3 As shown, it includes a processor, an input device, an output device and a memory, which are connected to each other, wherein the memory is used to store a computer program, the computer program includes program instructions, the processor is configured to call the program instructions, and the program includes instructions for executing the following steps;

[0100] Collecting initial blade vibration information and blade load information of the blades to be tested of the wind turbine generator set;

[0101] determining reference blade vibration information according to the blade load information;

[0102] Using the reference blade vibration information to correct the initial blade vibration information to obtain target blade vibration information;

[0103] Generate pitch control information according to the target blade vibration information and the operation information of the wind turbine generator set;

[0104] The pitch control information is used to perform pitch control on the wind turbine generator set.

[0105] The above mainly introduces the scheme of the embodiment of the present application from the perspective of the execution process on the method side. It is understandable that in order to realize the above functions, the terminal includes a hardware structure and / or software module corresponding to the execution of each function. Those skilled in the art should easily realize that, in combination with the units and algorithm steps of each example described in the embodiments provided herein, the present application can be implemented in the form of hardware or a combination of hardware and computer software. Whether a function is executed in the form of hardware or computer software driving hardware depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of this application.

[0106] The embodiment of the present application can divide the terminal into functional units according to the above method example. For example, each functional unit can be divided according to each function, or two or more functions can be integrated into one processing unit. The above integrated unit can be implemented in the form of hardware or in the form of software functional units. It should be noted that the division of units in the embodiment of the present application is schematic and is only a logical function division. There may be other division methods in actual implementation.

[0107] In line with the above, see Figure 4 , Figure 4 The present invention provides a schematic diagram of a pitch control device for a wind turbine generator set. Figure 4 As shown, the device comprises:

[0108] The collecting unit 401 is used to collect the initial blade vibration information and blade load information of the blade to be tested of the wind turbine;

[0109] A determination unit 402, configured to determine reference blade vibration information according to the blade load information;

[0110] A correction processing unit 403 is used to perform correction processing on the initial blade vibration information using the reference blade vibration information to obtain target blade vibration information;

[0111] A generating unit 404, configured to generate pitch control information according to the target blade vibration information and the operation information of the wind turbine generator set;

[0112] The control unit 405 is used to perform pitch control on the wind turbine generator set using the pitch control information.

[0113] In a possible implementation, the blade load information includes a blade root swing load, a blade swing direction vibration acceleration, a blade root flap load, and a blade flap direction vibration acceleration, and the determining unit 402 is specifically used to:

[0114] determining a first vibration acceleration according to the blade root shimmy load;

[0115] Acquire a first vibration acceleration corresponding to blade root vibration according to the blade vibration direction vibration acceleration and the first vibration acceleration;

[0116] determining a second vibration acceleration based on at least the blade root shimmy load;

[0117] Acquire a second vibration acceleration corresponding to blade root swing according to the blade flapping direction vibration acceleration and the second vibration acceleration;

[0118] The reference blade vibration information is determined according to the first vibration acceleration and the second vibration acceleration.

[0119] In a possible implementation, in determining the first vibration acceleration according to the blade root shimmy load, the determining unit 402 is specifically configured to:

[0120] Performing filtering processing on the blade root shimmy load to obtain a first reference blade root shimmy load;

[0121] The first reference blade root shimmy load is derivatized to obtain the first vibration acceleration.

[0122] In a possible implementation, in acquiring the first vibration acceleration corresponding to the blade root swing according to the blade swing direction vibration acceleration and the first vibration acceleration, the determining unit 402 is specifically configured to:

[0123] Performing spectrum and envelope analysis on the acceleration waveform curve corresponding to the first vibration acceleration to obtain a first reference natural frequency;

[0124] Performing spectrum and envelope analysis on the acceleration waveform curve corresponding to the vibration acceleration in the blade swing direction to obtain a second reference natural frequency;

[0125] If the frequency difference between the first reference natural frequency and the second reference natural frequency is less than a preset frequency difference threshold, the acceleration waveform curve corresponding to the first vibration acceleration is amplified according to a preset amplification factor to obtain a first acceleration waveform curve;

[0126] Vibration acceleration is calculated according to the first acceleration waveform curve to obtain the first vibration acceleration.

[0127] In a possible implementation, in determining the second vibration acceleration at least according to the blade root shimmy load, the determining unit 402 is specifically configured to:

[0128] A method for obtaining the vibration acceleration corresponding to the blade root oscillation load is determined according to the rotor speed of the generator set and the pitch angle of the generator set;

[0129] The blade root shimmy load is processed by using the vibration acceleration acquisition method corresponding to the blade root shimmy load to obtain a second vibration acceleration.

[0130] In a possible implementation, the generating unit 404 is specifically configured to:

[0131] Determine the full-field wind turbulence intensity of the wind field where the wind turbine is located according to the target blade vibration information and the operation information of the wind turbine;

[0132] The pitch control information is determined according to the overall wind turbulence intensity.

[0133] An embodiment of the present application also provides a computer storage medium, wherein the computer storage medium stores a computer program for electronic data exchange, and the computer program enables a computer to execute part or all of the steps of any wind turbine pitch control method recorded in the above method embodiments.

[0134] An embodiment of the present application also provides a computer program product, which includes a non-transitory computer-readable storage medium storing a computer program, and the computer program enables a computer to execute part or all of the steps of any wind turbine pitch control method recorded in the above method embodiments.

[0135] It should be noted that, for the aforementioned method embodiments, for the sake of simplicity, they are all expressed as a series of action combinations, but those skilled in the art should be aware that the present application is not limited by the described order of actions, because according to the present application, certain steps can be performed in other orders or simultaneously. Secondly, those skilled in the art should also be aware that the embodiments described in the specification are all preferred embodiments, and the actions and modules involved are not necessarily required by the present application.

[0136] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0137] In the several embodiments provided in the present application, it should be understood that the disclosed device can be implemented in other ways. For example, the device embodiments described above are only schematic, such as the division of the units, which is only a logical function division. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, and the indirect coupling or communication connection of the device or unit can be electrical or other forms.

[0138] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0139] In addition, the functional units in the various embodiments of the application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated units may be implemented in the form of hardware or in the form of software program modules.

[0140] If the integrated unit is implemented in the form of a software program module and sold or used as an independent product, it can be stored in a computer-readable memory. Based on this understanding, the technical solution of the present application is essentially or the part that contributes to the prior art or all or part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a memory, including a number of instructions to enable a computer device (which can be a personal computer, server or network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present application. The aforementioned memory includes: U disk, read-only memory (ROM), random access memory (RAM), mobile hard disk, disk or optical disk and other media that can store program codes.

[0141] A person of ordinary skill in the art can understand that all or part of the steps in the various methods of the above embodiments can be completed by instructing related hardware through a program, and the program can be stored in a computer-readable memory, which can include: a flash drive, a read-only memory, a random access memory, a magnetic disk or an optical disk, etc.

[0142] The embodiments of the present application are introduced in detail above. Specific examples are used in this article to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method and core idea of ​​the present application. At the same time, for general technical personnel in this field, according to the idea of ​​the present application, there will be changes in the specific implementation method and application scope. In summary, the content of this specification should not be understood as a limitation on the present application.

Claims

1. A variable pitch control method for a wind turbine, characterized in that: The method comprises: Collecting initial blade vibration information and blade load information of the blades to be tested of the wind turbine generator set; determining reference blade vibration information according to the blade load information; Using the reference blade vibration information to correct the initial blade vibration information to obtain target blade vibration information; Generate pitch control information according to the target blade vibration information and the operation information of the wind turbine generator set; The pitch control information is used to perform pitch control on the wind turbine generator set.

2. The pitch control method of a wind turbine according to claim 1, characterized in that: The blade load information includes blade root swing load, blade swing direction vibration acceleration, blade root flap load and blade flap direction vibration acceleration. Determining reference blade vibration information according to the blade load information includes: determining a first vibration acceleration according to the blade root shimmy load; Acquire a first vibration acceleration corresponding to blade root vibration according to the blade vibration direction vibration acceleration and the first vibration acceleration; determining a second vibration acceleration based on at least the blade root shimmy load; Acquire a second vibration acceleration corresponding to blade root swing according to the blade flapping direction vibration acceleration and the second vibration acceleration; The reference blade vibration information is determined according to the first vibration acceleration and the second vibration acceleration.

3. The pitch control method of a wind turbine according to claim 2, characterized in that: The determining a first vibration acceleration according to the blade root shimmy load comprises: Performing filtering processing on the blade root shimmy load to obtain a first reference blade root shimmy load; The first reference blade root shimmy load is derivatized to obtain the first vibration acceleration.

4. The pitch control method of a wind turbine according to claim 3, characterized in that: The obtaining of the first vibration acceleration corresponding to the blade root swing according to the blade swing direction vibration acceleration and the first vibration acceleration comprises: Performing spectrum and envelope analysis on the acceleration waveform curve corresponding to the first vibration acceleration to obtain a first reference natural frequency; Performing spectrum and envelope analysis on the acceleration waveform curve corresponding to the vibration acceleration in the blade swing direction to obtain a second reference natural frequency; If the frequency difference between the first reference natural frequency and the second reference natural frequency is less than a preset frequency difference threshold, the acceleration waveform curve corresponding to the first vibration acceleration is amplified according to a preset amplification factor to obtain a first acceleration waveform curve; Vibration acceleration is calculated according to the first acceleration waveform curve to obtain the first vibration acceleration.

5. The pitch control method for a wind turbine according to any one of claims 2 to 4, characterized in that: The determining of the second vibration acceleration at least according to the blade root shimmy load comprises: A method for obtaining the vibration acceleration corresponding to the blade root oscillation load is determined according to the rotor speed of the generator set and the pitch angle of the generator set; The blade root shimmy load is processed by using the vibration acceleration acquisition method corresponding to the blade root shimmy load to obtain a second vibration acceleration.

6. The pitch control method of a wind turbine according to claim 5, characterized in that: The generating the pitch control information according to the target blade vibration information and the operation information of the wind turbine generator set includes: Determine the full-field wind turbulence intensity of the wind field where the wind turbine is located according to the target blade vibration information and the operation information of the wind turbine; The pitch control information is determined according to the overall wind turbulence intensity.

7. A variable pitch control device for a wind turbine, characterized in that: The device comprises: A collection unit, used for collecting initial blade vibration information and blade load information of the blade to be tested of the wind turbine; a determination unit, configured to determine reference blade vibration information according to the blade load information; a correction processing unit, configured to perform correction processing on the initial blade vibration information using the reference blade vibration information to obtain target blade vibration information; A generating unit, configured to generate pitch control information according to the target blade vibration information and the operation information of the wind turbine generator set; A control unit is used to perform pitch control on the wind turbine generator set using the pitch control information.

8. The pitch control device for a wind turbine according to claim 7, characterized in that: The blade load information includes blade root swing load, blade swing direction vibration acceleration, blade root flap load and blade flap direction vibration acceleration, and the determination unit is specifically used for: determining a first vibration acceleration according to the blade root shimmy load; Acquire a first vibration acceleration corresponding to blade root vibration according to the blade vibration direction vibration acceleration and the first vibration acceleration; determining a second vibration acceleration based on at least the blade root shimmy load; Acquire a second vibration acceleration corresponding to blade root swing according to the blade flapping direction vibration acceleration and the second vibration acceleration; The reference blade vibration information is determined according to the first vibration acceleration and the second vibration acceleration.

9. A terminal, characterized in that: The method comprises a processor, an input device, an output device and a memory, wherein the processor, the input device, the output device and the memory are interconnected, wherein the memory is used to store a computer program, the computer program comprises program instructions, and the processor is configured to call the program instructions to execute the method according to any one of claims 1 to 6.

10. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a computer program, wherein the computer program includes program instructions, and when the program instructions are executed by a processor, the processor is caused to perform the method according to any one of claims 1 to 6.

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