Wind turbine single blade stuck fault shutdown load reduction control method and electronic device

Abstract

The application discloses a load reduction control method for single-blade jam fault shutdown of a wind turbine and electronic equipment, and relates to the technical field of shutdown control strategies after wind turbine faults. After it is determined that a blade has a jam fault, first, the target torque of the generator of the wind turbine is controlled to be greater than the rated torque within a set time period, and the non-fault blade is controlled to perform a parabolic pitch action. Then, after the set time period ends, when the non-fault blade is pitching, the optimal pitch angle change and the optimal generator torque of each action period are calculated, so that the non-fault blade and the generator operate with optimal working parameters in each action period. Finally, when the generator speed is less than a preset off-grid speed and the pitch angle of the non-fault blade is greater than a state switching angle threshold, the target torque of the generator is controlled to be zero, and the non-fault blade is controlled to perform a fixed slope pitch action. The application has the advantages of simple algorithm, accurate control and high efficiency.

Description

Technical Field

[0001] This application relates to the technical field of shutdown control strategies after a wind turbine failure, specifically, to a load reduction control method and electronic equipment for a wind turbine shut-down due to a single blade jamming failure. Background Technology

[0002] Wind turbine rotors are becoming increasingly larger, with single blade lengths now exceeding 140 meters, and even longer for offshore wind turbines. During operation, if a blade seizes up, the unbalanced load can damage components such as the hub drivetrain, and even cause tower collapse. Single-blade seizures are typically caused by damage to hardware components like the pitch motor, pitch reducer, and pitch bearings, or by software malfunctions. Wind turbine pitch systems are independently driven; when one blade seizes, the other two blades can still operate autonomously, allowing the turbine to shut down. However, during shutdown, the load can become excessive, requiring load shedding control.

[0003] To address the issue of excessive load during wind turbine shutdown, existing load reduction technologies require feedback control of the nacelle's forward and backward acceleration as well as its left and right acceleration. This involves calculating blade difference, determining pitch speed, and taking multiple parameters such as engine speed, nacelle forward and backward acceleration, and left and right acceleration to calculate the pitch path. The algorithm is quite complex, which affects the efficiency of generating shutdown control strategies. Summary of the Invention

[0004] The technical problem to be solved by this application is that the load reduction control strategy during the shutdown process of a wind turbine in the event of a single blade jamming fault is complex and affects the efficiency of strategy generation. Therefore, this application provides a load reduction control method and electronic equipment for the shutdown of a wind turbine in the event of a single blade jamming fault.

[0005] In a first aspect, the technical solution of this application provides a load reduction control method for wind turbine unit single blade jamming fault shutdown, including:

[0006] Acquire the operating data of the wind turbine and determine whether there is a blade jamming fault based on the operating data;

[0007] If any blade gets stuck, the target torque of the wind turbine generator will be controlled to be greater than the rated torque within a set time period, and the non-faulty blades will be controlled to perform a parabolic blade retraction action.

[0008] After the set duration ends, the optimal pitch angle change and the optimal torque of the generator for each action cycle of the non-faulty blade during the pitch retraction process are determined, and the non-faulty blade is controlled to perform the pitch retraction action according to the optimal pitch angle change, and the generator is controlled to operate according to the optimal torque.

[0009] The generator speed of the wind turbine and the pitch angle of the non-faulty blades are collected in real time.

[0010] When the generator speed is less than the preset disconnection speed and the pitch angle of the non-faulty blade is greater than the state switching angle threshold, the generator target torque is controlled to be zero, and the non-faulty blade is controlled to perform a fixed slope pitching action.

[0011] Preferably, in some schemes, the load reduction control method for wind turbine single-blade jamming failure shutdown, after the set time period, determines the optimal pitch angle change and the optimal generator torque of the non-faulty blade during each action cycle of the blade retraction process, and controls the non-faulty blade to perform blade retraction action according to the optimal pitch angle change. The generator is controlled to obtain the optimal pitch angle change during the optimal torque action in the following manner:

[0012] Obtain the thrust coefficient function, which has wind speed, wind turbine speed, wind turbine radius and blade pitch angle as independent variables and blade thrust coefficient as dependent variable;

[0013] The first operating data of the wind turbine in the current operation cycle is obtained, and the first operating data includes the first wind speed, the first wind turbine speed, the wind turbine radius, the first faulty blade pitch angle and the first non-faulty blade pitch angle.

[0014] Based on the first operating data, multiple estimated second operating data of the wind turbine are estimated for the next operating cycle. The estimated second operating data includes: second wind speed, second wind turbine speed, wind turbine radius, second faulty blade pitch angle and second non-faulty blade pitch angle.

[0015] Based on each of the estimated second operating data and the thrust coefficient function, the thrust coefficient of the faulty blade and the thrust coefficient of the non-faulty blade are calculated in the next operating cycle, and the difference in thrust coefficient between the faulty blade and the non-faulty blade is obtained.

[0016] The estimated second operating data corresponding to the minimum thrust coefficient difference is selected as the target operating data for the next action cycle;

[0017] The difference between the second non-faulty blade pitch angle in the target operating data and the first non-faulty blade pitch angle in the first operating data is taken as the optimal pitch angle change.

[0018] Preferably, in some schemes, the load reduction control method for wind turbine single-blade jamming failure shutdown is expressed as follows:

[0019] ;

[0020] ;

[0021] in, Indicates the blade thrust coefficient. Indicates the blade pitch angle. Indicates the tip speed ratio of the blade. Indicates the wind turbine speed. Indicates the radius of the wind turbine. Wind speed.

[0022] Preferably, in some schemes, the load reduction control method for wind turbine single-blade jamming failure shutdown, after the set time period, determines the optimal pitch angle change and the optimal generator torque of the non-faulty blade during each action cycle of the blade retraction process, and controls the non-faulty blade to perform blade retraction action according to the optimal pitch angle change. The optimal torque is obtained by controlling the generator to perform the optimal torque action in the following manner:

[0023] The second wind turbine speed in the target operating data is used as the target wind turbine speed in the next operating cycle;

[0024] The optimal torque of the generator is calculated based on the target wind turbine speed and the first wind turbine speed.

[0025] Preferably, in some schemes, the load reduction control method for wind turbine single-blade jamming failure shutdown includes, if any blade jams, controlling the wind turbine generator target torque to be greater than the rated torque within a set time period, and controlling the non-faulty blades to perform parabolic blade recovery action:

[0026] The set duration is determined according to the type and model of the wind turbine, and the set duration is 2 to 6 seconds; the target torque of the generator is 1.05 to 1.1 times the rated torque.

[0027] Preferably, the load reduction control method for wind turbine single-blade jamming failure shutdown described in some solutions involves acquiring the wind turbine's operating data and determining whether a blade jamming failure has occurred based on the operating data, including:

[0028] Obtain the pitch angle of each blade and calculate the absolute value of the difference between the pitch angles of any two blades.

[0029] If the absolute value of the pitch angle difference between any blade and other blades is greater than the set tolerance angle, then the blade is determined to be stuck.

[0030] Preferably, the load reduction control method for wind turbine unit single blade jamming failure shutdown described in some schemes further includes:

[0031] If the pitch angle of all non-faulty blades of the wind turbine is greater than the set blade retraction threshold, and the generator speed of the wind turbine is less than the shutdown speed threshold, then the wind turbine is determined to have completed shutdown.

[0032] Secondly, the technical solution of this application provides a load reduction control device for wind turbine unit single blade jamming failure shutdown, comprising:

[0033] The data acquisition module is used to acquire the operating data of the wind turbine and determine whether there is a blade jamming fault based on the operating data.

[0034] The control module is used to control the target torque of the wind turbine generator to be greater than the rated torque within a set time period when any blade jams, and to control the non-faulty blades to perform parabolic pitch retraction. After the set time period ends, the module determines the optimal pitch angle change and the optimal torque of the generator for each action cycle of the non-faulty blades during the pitch retraction process, and controls the non-faulty blades to perform pitch retraction according to the optimal pitch angle change, and controls the generator to operate according to the optimal torque.

[0035] The data acquisition module is also used to collect the generator speed of the wind turbine and the pitch angle of the non-faulty blades in real time.

[0036] The control module is also used to control the generator target torque to zero and control the non-faulty blades to perform a fixed-slope blade retraction action when the generator speed is less than the preset disconnection speed and the pitch angle of the non-faulty blades is greater than the state switching angle threshold.

[0037] Thirdly, the technical solution of this application provides a computer-readable storage medium storing program information. After reading the program information, the computer executes the steps of the load reduction control method for single blade jamming fault shutdown of wind turbine as described in any one of the first aspects.

[0038] Fourthly, the present application provides an electronic device, including a memory, a processor, and a computer program stored in the memory, wherein the processor executes the computer program to implement the load reduction control method for single blade jamming fault shutdown of a wind turbine as described in any of the first aspects.

[0039] The technical solution provided in this application has the following technical effects compared with the prior art:

[0040] This application's solution, after confirming a blade jamming fault, executes blade retraction in three stages using different strategies. First, within a set time period, the target torque of the wind turbine generator is controlled to exceed the rated torque, and the non-faulty blades are controlled to perform a parabolic retraction motion. Increasing the generator's target torque reduces the blade speed, providing protection for subsequent blade retraction. Second, after the set time period ends, when controlling the non-faulty blades to retract, the optimal pitch angle change and the form of the generator's optimal torque for each operating cycle are calculated. This ensures that both the non-faulty blades and the generator operate with optimal parameters in each cycle, achieving optimal retraction for the non-faulty blades. Finally, when the generator speed is lower than the preset grid disconnection speed and the pitch angle of the non-faulty blades exceeds the state switching angle threshold, the third stage begins. The generator's target torque is controlled to zero, and the non-faulty blades are controlled to perform a fixed-slope retraction motion. Compared to existing technologies, this application's solution uses parameter adjustments of the generator and blade pitch angles to achieve load reduction control, resulting in a simple algorithm and high control efficiency. Moreover, the gradient control strategy in the second stage of this application can more accurately control the operation of wind turbine units and achieve a significant load reduction effect. Attached Figure Description

[0041] Figure 1 This is a flowchart of a load reduction control method for a wind turbine unit shutting down due to a single blade jamming fault, as described in one embodiment of this application.

[0042] Figure 2 This application provides a schematic diagram of the three control stages for load reduction during a single-blade jamming fault shutdown of a wind turbine generator, as described in one embodiment.

[0043] Figure 3 This is a surface diagram of the wind turbine rotor thrust coefficient of another embodiment of this application;

[0044] Figure 4 This is a structural block diagram of a load reduction control device for a single blade jamming failure shutdown of a wind turbine generator according to one embodiment of this application;

[0045] Figure 5 This is a schematic diagram of the electronic device used in an embodiment of the present application to perform a load reduction control method for shutting down a wind turbine due to a single blade jamming fault. Detailed Implementation

[0046] The specific embodiments of this application will be further described below with reference to the accompanying drawings.

[0047] It is readily understood that, based on the technical solution of this application, various structural and implementation methods can be interchanged by those skilled in the art without altering the essential spirit of this application. Therefore, the following detailed embodiments and accompanying drawings are merely illustrative examples of the technical solution of this application and should not be considered as the entirety of this application or as limitations or restrictions on the technical solution of the application.

[0048] This embodiment provides a load reduction control method for wind turbine generator set shutdown due to single blade jamming fault, which is applied to the control system of wind turbine generator set, such as... Figure 1 As shown, the method includes:

[0049] S100: Obtain the operating data of the wind turbine and determine whether there is a blade jamming fault based on the operating data.

[0050] Wind turbines are equipped with multiple monitoring devices to monitor their operating status, such as blade pitch angle, generator speed, and generator torque. They also monitor relevant environmental data, such as ambient wind speed and temperature. Therefore, operational data can be obtained through the various monitoring devices installed within the wind turbine.

[0051] Under normal operating conditions, the operating data of a wind turbine should be within the standard range. If a blade jamming fault occurs, it will affect things such as the blade pitch angle. In this case, you can determine whether a blade jamming fault has occurred by judging whether the blade pitch angle is affected based on the operating data.

[0052] S200: If any blade jams, the target torque of the wind turbine generator is controlled to be greater than the rated torque within a set time period, and the non-faulty blades are controlled to perform a parabolic blade retraction action.

[0053] This stage can be used as the initial state stage. The set duration can be determined based on experience. The set duration can vary depending on the model of the wind turbine.

[0054] Wind turbine generators are designed with a certain margin of safety in their rated torque settings. Therefore, the target torque of the generator in this step can be greater than the rated torque, especially within a short setting period. A slightly higher rated torque will not affect the operation of the wind turbine. Generator torque is inversely proportional to blade speed; as generator torque increases, blade speed decreases, which ensures greater safety during subsequent propeller retraction.

[0055] Non-faulty blades perform a parabolic retraction motion, meaning that the pitch angle changes non-linearly during retraction, but rather follows a parabolic pattern. This step is in the initial retraction phase, where the pitch angle changes slowly, exhibiting good stability.

[0056] S300: After the set time period ends, determine the optimal pitch angle change and the optimal torque of the generator for each action cycle of the non-faulty blade during the pitch retraction process, and control the non-faulty blade to perform the pitch retraction action according to the optimal pitch angle change, and control the generator to operate according to the optimal torque.

[0057] After the set duration ends, the propeller control enters the second strategy, which can be considered a neutral phase. Its implementation involves gradual control according to a cycle. This step determines the optimal operating parameters for non-faulty blades and the generator in each operating cycle. Then, the non-faulty blades and generator are controlled according to these optimal parameters. Operating with optimal parameters in each cycle minimizes unbalanced loads on the wind turbine and ensures smooth load reduction.

[0058] S400: Real-time acquisition of the generator speed of the wind turbine and the pitch angle of the non-faulty blades.

[0059] In the load reduction control strategy described above, the generator speed and the pitch angle of non-faulty blades can be monitored in real time through monitoring devices.

[0060] S500: When the generator speed is less than the preset disconnection speed and the pitch angle of the non-faulty blade is greater than the state switching angle threshold, the generator target torque is controlled to be zero, and the non-faulty blade is controlled to perform a fixed slope pitching action.

[0061] This stage can be considered the final state stage. The preset disconnection speed and state switching angle threshold can be determined based on empirical values, which serve as the judgment conditions for transitioning from the intermediate state stage to the final state stage during load reduction control.

[0062] When the generator's target torque is zero, the wind turbine is controlled to disconnect from the grid, and the non-faulty blades change their pitch angle at a fixed slope. During this process, the rate of change of the non-faulty blade pitch angle is constant, and there will be no sudden angle changes.

[0063] The solutions in the above embodiments, such as Figure 2As shown, after a blade jamming fault is confirmed, blade retraction is performed in three stages using different strategies. First, in the initial state stage, within a set time period, the target torque of the wind turbine generator is controlled to be greater than the rated torque, and the non-faulty blades are controlled to perform a parabolic retraction motion. Increasing the generator's target torque reduces the blade speed, providing protection for subsequent blade retraction. Second, after the set time period ends, the intermediate state stage begins. When controlling the non-faulty blades to retract, the optimal pitch angle change and the form of the generator's optimal torque for each operating cycle are calculated, ensuring that both the non-faulty blades and the generator operate with optimal parameters in each cycle, achieving optimal gradient retraction for the non-faulty blades. Finally, in the modal stage, when the generator speed is less than the preset grid disconnection speed and the pitch angle of the non-faulty blades is greater than the state switching angle threshold, the third stage begins. The generator's target torque is controlled to be zero, and the non-faulty blades are controlled to perform a fixed-slope retraction motion. Compared to existing technologies, this application's solution uses parameter adjustments of the generator and blade pitch angles to achieve load reduction control, resulting in a simple algorithm and high control efficiency. Moreover, the gradient control strategy in the current phase of this application can more accurately control the operation of wind turbine units and achieve a significant load reduction effect.

[0064] Preferably, in step 300, the optimal pitch angle change is obtained in the following manner:

[0065] S301: Obtain the thrust coefficient function, wherein the thrust coefficient function has wind speed, wind turbine speed, wind turbine radius and blade pitch angle as independent variables and blade thrust coefficient as dependent variable.

[0066] In practical implementation, simulation can be used to obtain results such as... Figure 3 The diagram shown is a surface plot of the wind turbine rotor thrust coefficient. Figure 3 The figure shows a three-dimensional simulation curve, with the X-axis representing the tip speed ratio and the Y-axis representing the pitch angle, and the ordinate representing the thrust coefficient. The tip speed ratio is related to wind speed, rotor speed, rotor radius, and blade pitch angle. Therefore, by using the coordinate parameters of all points on the three-dimensional simulation curve, the relationship between the tip speed ratio (which corresponds to wind speed, rotor speed, rotor radius, and blade pitch angle), the pitch angle, and the thrust coefficient can be obtained. The value of the dependent variable can also be obtained after determining the independent variable by looking up a table. Preferably, the thrust coefficient function is expressed as:

[0067] ;

[0068] ;

[0069] in, Indicates the blade thrust coefficient. Indicates the blade pitch angle. Indicates the tip speed ratio of the blade. Indicates the wind turbine speed. Indicates the radius of the wind turbine. Wind speed.

[0070] S302: Obtain the first operating data of the wind turbine in the current operation cycle, the first operating data including the first wind speed V(t2) and the first wind turbine rotation speed. Wind turbine radius, first fault blade pitch angle and the first non-faulty blade pitch angle ,in, This indicates the time corresponding to the current action cycle. The above operational data can be determined through monitoring devices.

[0071] S303: Based on the first operating data, estimate multiple estimated second operating data for the wind turbine in the next operating cycle, the estimated second operating data including: second wind speed V( ), second wind turbine speed Wind turbine radius, second fault blade pitch angle Second non-faulty blade pitch angle . Corresponding to the duration of the period, it is relatively short, and can be approximated as V(t2) = V( The faulty blade is stuck, so the pitch angle will not change. = Multiple propeller recovery trajectories can be pre-planned, and the corresponding second operating data can be calculated based on each trajectory.

[0072] S304: Calculate the thrust coefficient of the faulty blade in the next operating cycle based on each of the estimated second operating data and the thrust coefficient function. Thrust coefficient of non-faulty blades The difference in thrust coefficient between the faulty and non-faulty blades was obtained.

[0073] Based on the thrust coefficient function described in step S301, the difference in thrust coefficient between the faulty and non-faulty blades under each planned trajectory can be calculated. This difference is used to characterize the degree of imbalance of the impeller during the operation of the wind turbine; the smaller the difference, the higher the degree of balance.

[0074] ;

[0075] ;

[0076] .

[0077] S305: Select the estimated second operating data corresponding to the minimum thrust coefficient difference as the target operating data for the next action cycle.

[0078] ;

[0079] m represents the number of planned trajectories. Taking into account both the effectiveness of the algorithm and the computational cost, m can be selected as 3 to 5 in the specific implementation, which is the number of the second preset running data. J represents the gradient change of the optimal thrust coefficient.

[0080] S306: The difference between the second non-faulty blade pitch angle in the target operating data and the first non-faulty blade pitch angle in the first operating data is taken as the optimal pitch angle change.

[0081] Once J is determined, the optimal trajectory and the thrust coefficient difference of the non-faulty blades corresponding to the optimal trajectory can be determined. The optimal pitch angle change can be obtained by reverse calculation.

[0082] This scheme employs optimal gradient control for the non-faulty blades' retraction action in each operating cycle until the pitch angle of the non-faulty blades meets the conditions for entering the next stage of the control strategy. This scheme dynamically adjusts and assesses the wind turbine load in real time, ensuring optimal real-time load. Simultaneously, it significantly reduces the unbalanced load on the wind turbine after a single blade jamming failure, effectively eliminating the risk of wind turbine overturning and tower collapse caused by a single blade jamming, thus ensuring turbine safety.

[0083] Furthermore, the optimal torque is obtained in the following manner:

[0084] S307: The second wind turbine speed in the target operating data is used as the target wind turbine speed in the next operating cycle.

[0085] S308: The optimal torque of the generator is calculated based on the target wind turbine speed and the first wind turbine speed.

[0086] In other words, during this phase, the wind turbine shutdown strategy will be implemented in the following ways:

[0087] ;

[0088] in, Indicates the generator's optimal torque. This indicates a generator torque control command. The control method, namely proportional-integral (PI) control, is a commonly used closed-loop control strategy in the field of automatic control. In this scheme, the rotor speed is based on the current operating cycle. and the target rotor speed for the next action cycle The difference is used for PI control to achieve dynamic adjustment of generator torque. This is the target pitch angle of the non-faulty blades in the next operating cycle.

[0089] In some preferred embodiments, the setting duration in step S100 is determined according to the type and model of the wind turbine, and the setting duration is 2 to 6 seconds, which can be selected as 3 to 5 seconds in specific implementation; the target torque of the generator is 1.05 to 1.1 times the rated torque, which can be selected as 1.1 times in specific implementation.

[0090] That is, in this stage, the set duration is expressed as , to generate the target torque Set to rated torque 110% of the pitch angle control target for non-faulty blades From the current pitch angle The oarsing follows a parabolic trajectory, with the parabolic coefficient... The value varies depending on the device model and platform, specifically:

[0091] ;

[0092] According to the above control strategy, the faulty blade is stuck at a specific angle, while the non-faulty blades follow... During propeller retraction, the generator torque increases to .

[0093] The goal of the above scheme is to rapidly reduce the speed of the wind turbine to prevent overspeeding, while also reducing the impact during the shutdown process of the wind turbine.

[0094] In some schemes, the stuck blade can be identified in step S100 as follows:

[0095] S101: Obtain the pitch angle of each blade and calculate the absolute value of the difference in pitch angle between any two blades.

[0096] For the three blades, let's call them 1, 2, and 3. Sensors are used to measure the pitch angles of blades 1, 2, and 3. , , Then, calculate the absolute value of the difference between any two blades of the three blades according to the following formula:

[0097] .

[0098] S102: If the absolute value of the pitch angle difference between any blade and other blades is greater than the set tolerance angle, then the blade is determined to be stuck.

[0099] Setting tolerance angle This value can be determined based on experience; setting this value can reduce the system's sensitivity to disturbances. , , and Based on the relationship between the comparison results, it is determined whether a single blade jamming fault has occurred, and the jammed blade number is identified to distinguish between faulty and non-faulty blades. The judgment logic is shown in the table below:

[0100] Logical table for judging stuck blades

[0101]

[0102] The algorithm described above for identifying stuck blades is simple and highly accurate.

[0103] Furthermore, the above scheme also includes: if the pitch angle of all non-faulty blades of the wind turbine is greater than the set blade retraction threshold, and the generator speed of the wind turbine is less than the shutdown speed threshold, then the wind turbine is determined to have completed shutdown.

[0104] That is, the wind turbine is continuously controlled to shut down according to the strategy in the final stage. When two conditions are met: the generator speed is less than the shutdown speed threshold, such as 100 rpm; and the pitch angle of all non-faulty blades is greater than the set pitch angle threshold, such as 85 degrees, it is determined that the wind turbine is in the shutdown completed state. The wind turbine is not allowed to start automatically and sends instructions to the central control center on the fault type, faulty blade and maintenance suggestion.

[0105] This application also provides a load reduction control device for wind turbine unit single blade jamming failure shutdown, such as... Figure 4 As shown, it includes:

[0106] The data acquisition module 100 is used to acquire the operating data of the wind turbine and determine whether there is a blade jamming fault based on the operating data.

[0107] The control module 200 is used to control the target torque of the generator of the wind turbine to be greater than the rated torque within a set time period when any blade jams, and to control the non-faulty blade to perform a parabolic pitch retraction action; after the set time period ends, it determines the optimal pitch angle change and the optimal torque of the generator for each action cycle of the non-faulty blade during the pitch retraction process, and controls the non-faulty blade to perform the pitch retraction action according to the optimal pitch angle change, and controls the generator to operate according to the optimal torque.

[0108] The data acquisition module 100 is also used to collect the generator speed of the wind turbine and the pitch angle of the non-faulty blades in real time.

[0109] The control module 200 is further configured to control the generator target torque to zero and control the non-faulty blades to perform a fixed-slope blade retraction action when the generator speed is less than the preset grid disconnection speed and the pitch angle of the non-faulty blades is greater than the state switching angle threshold.

[0110] When the above-mentioned device controls the wind turbine to stop, the algorithm is simple, the control efficiency is high, and the gradient control strategy can more accurately control the operation of the wind turbine and achieve a significant load reduction effect.

[0111] Preferably, the data acquisition module 100 acquires a thrust coefficient function, wherein the thrust coefficient function has wind speed, rotor speed, rotor radius and blade pitch angle as independent variables and blade thrust coefficient as dependent variable; and acquires the first operating data of the wind turbine in the current operating cycle, wherein the first operating data includes the first wind speed, the first rotor speed, rotor radius, the first faulty blade pitch angle and the first non-faulty blade pitch angle. The control module 200 obtains the optimal pitch angle change in the following manner: Based on the first operating data, it estimates multiple estimated second operating data for the wind turbine in the next operating cycle. These estimated second operating data include: second wind speed, second rotor speed, rotor radius, second faulty blade pitch angle, and second non-faulty blade pitch angle. Based on each estimated second operating data and the thrust coefficient function, it calculates the thrust coefficient of the faulty blade and the thrust coefficient of the non-faulty blade in the next operating cycle, and obtains the difference in thrust coefficients between the faulty and non-faulty blades. It selects the estimated second operating data corresponding to the minimum thrust coefficient difference as the target operating data for the next operating cycle. The difference between the second non-faulty blade pitch angle in the target operating data and the first non-faulty blade pitch angle in the first operating data is used as the optimal pitch angle change. The thrust coefficient function obtained by the data acquisition module 100 is expressed as:

[0112] ;

[0113] ;

[0114] in, Indicates the blade thrust coefficient. Indicates the blade pitch angle. Indicates the tip speed ratio of the blade. Indicates the wind turbine speed. Indicates the radius of the wind turbine. Wind speed.

[0115] The control module 200 obtains the optimal torque by using the second wind turbine speed in the target operating data as the target wind turbine speed in the next operating cycle; and calculating the optimal torque of the generator based on the target wind turbine speed and the first wind turbine speed.

[0116] The above devices assess the wind turbine load in real time and make dynamic adjustments to ensure optimal real-time load. At the same time, they can significantly reduce the unbalanced load of the wind turbine after a single blade jamming failure, effectively eliminating the risk of wind turbine overturning and tower collapse caused by single blade jamming, and ensuring the safety of the unit.

[0117] More preferably, in the data acquisition module 100, the set duration is determined according to the type and model of the wind turbine, and the set duration is 2 to 6 seconds; the target torque of the generator is 1.05 to 1.1 times the rated torque, and in specific implementation, 1.1 times is selected. This allows the wind turbine speed to decrease rapidly to prevent overspeeding, while also reducing the impact during the wind turbine shutdown process.

[0118] Preferably, the data acquisition module 100 acquires the pitch angle of each blade and calculates the absolute value of the pitch angle difference between any two blades; if the absolute value of the pitch angle difference between any blade and other blades is greater than a set tolerance angle, then the blade is determined to have a jamming fault. The method used in this module has a simple algorithm for determining jammed blades and high accuracy.

[0119] Preferably, the device further includes a determination module. If the pitch angles of all non-faulty blades of the wind turbine are greater than a set blade retraction threshold, and the generator speed of the wind turbine is less than a shutdown speed threshold, then the wind turbine is determined to have completed shutdown. The wind turbine is continuously controlled according to the strategy of the final state phase until the shutdown determination conditions are met.

[0120] In some embodiments of this application, a computer-readable storage medium is provided, which stores program information. After reading the program information, the computer executes the steps of the load reduction control method for single blade jamming fault shutdown of wind turbine generator as described in any of the above method embodiments.

[0121] Some embodiments of this application provide an electronic device, such as... Figure 5As shown, the electronic device includes at least one processor 51 and at least one memory 52. ​​The memory 52 stores program information. After reading the program information, the processor 51 executes the load reduction control method for wind turbine single-blade jamming fault shutdown as described in any of the above method embodiments. The device may further include an input device 53 and an output device 54. The processor 51, memory 52, input device 53, and output device 54 can be communicatively connected. The memory 52, as a non-volatile computer-readable storage medium, can be used to store non-volatile software programs, non-volatile computer-executable programs, and modules. The processor 51 executes various functional applications and data processing by running the non-volatile software programs, instructions, and modules stored in the memory 52, thereby implementing the load reduction control method for wind turbine single-blade jamming fault shutdown provided in any of the above embodiments. The memory 52 may include a program storage area and a data storage area. The program storage area may store the operating system and application programs required for at least one function; the data storage area may store data created based on the use of the wind turbine single-blade jamming fault shutdown load reduction control method. Furthermore, memory 52 may include high-speed random access memory and non-volatile memory, such as at least one disk storage device, flash memory device, or other non-volatile solid-state storage device. In some embodiments, memory 52 may optionally include memory remotely located relative to processor 51, which can be connected via a network to means of performing a load reduction control method for wind turbine single-blade jamming fault shutdown. Examples of such networks include, but are not limited to, the Internet, intranets, local area networks, mobile communication networks, and combinations thereof. Input device 53 may receive user clicks and generate signal inputs related to user settings and function control of the wind turbine single-blade jamming fault shutdown load reduction control method. Output device 54 may include a display device such as a display screen. When one or more modules are stored in memory 52 and are run by one or more processors 51, the wind turbine single-blade jamming fault shutdown load reduction control method of any of the above method embodiments is executed.

[0122] As needed, the above technical solutions can be combined to achieve the best technical effect.

[0123] The above are merely the principles and preferred embodiments of this application. It should be noted that, for those skilled in the art, several other modifications can be made based on the principles of this application, and these modifications should also be considered within the scope of protection of this application.

Claims

1. A load reduction control method for wind turbine unit shutdown due to single blade jamming fault, characterized in that, include: Acquire the operating data of the wind turbine and determine whether there is a blade jamming fault based on the operating data; If any blade gets stuck, the target torque of the wind turbine generator will be controlled to be greater than the rated torque within a set time period, and the non-faulty blades will be controlled to perform a parabolic blade retraction action. After the set duration expires, the optimal pitch angle change and the optimal generator torque for each operating cycle of the non-faulty blade during the pitch retraction process are determined. The non-faulty blade is then controlled to perform the pitch retraction action according to the optimal pitch angle change, and the generator is controlled to operate according to the optimal torque. The optimal pitch angle change is obtained as follows: Obtain the thrust coefficient function, which has wind speed, wind turbine speed, wind turbine radius and blade pitch angle as independent variables and blade thrust coefficient as dependent variable; The first operating data of the wind turbine in the current operation cycle is obtained, and the first operating data includes the first wind speed, the first wind turbine speed, the wind turbine radius, the first faulty blade pitch angle and the first non-faulty blade pitch angle. Based on the first operating data, multiple estimated second operating data of the wind turbine are estimated for the next operating cycle. The estimated second operating data includes: second wind speed, second wind turbine speed, wind turbine radius, second faulty blade pitch angle and second non-faulty blade pitch angle. Based on each of the estimated second operating data and the thrust coefficient function, the thrust coefficient of the faulty blade and the thrust coefficient of the non-faulty blade are calculated in the next operating cycle, and the difference in thrust coefficient between the faulty blade and the non-faulty blade is obtained. The estimated second operating data corresponding to the minimum thrust coefficient difference is selected as the target operating data for the next action cycle; The difference between the second non-faulty blade pitch angle in the target operating data and the first non-faulty blade pitch angle in the first operating data is taken as the optimal pitch angle change. The generator speed of the wind turbine and the pitch angle of the non-faulty blades are collected in real time. When the generator speed is less than the preset disconnection speed and the pitch angle of the non-faulty blade is greater than the state switching angle threshold, the generator target torque is controlled to be zero, and the non-faulty blade is controlled to perform a fixed slope pitching action.

2. The load reduction control method for wind turbine unit single blade jamming failure shutdown according to claim 1, characterized in that, The thrust coefficient function is expressed as follows: ； ； in, Indicates the blade thrust coefficient. Indicates the blade pitch angle. Indicates the tip speed ratio of the blade. Indicates the wind turbine speed. Indicates the radius of the wind turbine. Wind speed.

3. The load reduction control method for wind turbine unit single blade jamming failure shutdown according to claim 2, characterized in that, After the set duration ends, the optimal pitch angle change and the optimal generator torque for each action cycle of the non-faulty blades during the pitch retraction process are determined. The non-faulty blades are then controlled to perform the pitch retraction action according to the optimal pitch angle change. The optimal torque is obtained by controlling the generator to operate according to the optimal torque in the following manner: The second wind turbine speed in the target operating data is used as the target wind turbine speed in the next operating cycle; The optimal torque of the generator is calculated based on the target wind turbine speed and the first wind turbine speed.

4. The load reduction control method for wind turbine unit single blade jamming failure shutdown according to claim 1, characterized in that, If any blade jams, the target torque of the wind turbine generator will be controlled to be greater than the rated torque within a set time period, and the non-faulty blades will be controlled to perform a parabolic blade recovery action. The set duration is determined according to the type and model of the wind turbine, and the set duration is 2 to 6 seconds; the target torque of the generator is 1.05 to 1.1 times the rated torque.

5. The load reduction control method for wind turbine unit single blade jamming fault shutdown according to any one of claims 1-4, characterized in that, Acquire wind turbine operating data and determine whether blade jamming has occurred based on the operating data, including: Obtain the pitch angle of each blade and calculate the absolute value of the difference between the pitch angles of any two blades. If the absolute value of the pitch angle difference between any blade and other blades is greater than the set tolerance angle, then the blade is determined to be stuck.

6. The load reduction control method for wind turbine unit single blade jamming failure shutdown according to claim 5, characterized in that, Also includes: If the pitch angle of all non-faulty blades of the wind turbine is greater than the set blade retraction threshold, and the generator speed of the wind turbine is less than the shutdown speed threshold, then the wind turbine is determined to have completed shutdown.

7. A load reduction control device for wind turbine unit single blade jamming failure shutdown, characterized in that, include: The data acquisition module is used to acquire the operating data of the wind turbine and determine whether there is a blade jamming fault based on the operating data. The control module is used to, when any blade experiences a jamming fault, control the generator of the wind turbine to have a target torque greater than the rated torque within a set time period, and control the non-faulty blades to perform a parabolic pitch retraction maneuver; after the set time period ends, determine the optimal pitch angle change and the optimal generator torque for each action cycle of the non-faulty blades during the pitch retraction process, and control the non-faulty blades to perform the pitch retraction maneuver according to the optimal pitch angle change, and control the generator to operate according to the optimal torque; wherein, the optimal pitch angle change is obtained through the following method: Obtain the thrust coefficient function, which has wind speed, wind turbine speed, wind turbine radius and blade pitch angle as independent variables and blade thrust coefficient as dependent variable; The first operating data of the wind turbine in the current operation cycle is obtained, and the first operating data includes the first wind speed, the first wind turbine speed, the wind turbine radius, the first faulty blade pitch angle and the first non-faulty blade pitch angle. Based on the first operating data, multiple estimated second operating data of the wind turbine are estimated for the next operating cycle. The estimated second operating data includes: second wind speed, second wind turbine speed, wind turbine radius, second faulty blade pitch angle and second non-faulty blade pitch angle. Based on each of the estimated second operating data and the thrust coefficient function, the thrust coefficient of the faulty blade and the thrust coefficient of the non-faulty blade are calculated in the next operating cycle, and the difference in thrust coefficient between the faulty blade and the non-faulty blade is obtained. The estimated second operating data corresponding to the minimum thrust coefficient difference is selected as the target operating data for the next action cycle; The difference between the second non-faulty blade pitch angle in the target operating data and the first non-faulty blade pitch angle in the first operating data is taken as the optimal pitch angle change. The data acquisition module is also used to collect the generator speed of the wind turbine and the pitch angle of the non-faulty blades in real time. The control module is also used to control the generator target torque to zero and control the non-faulty blades to perform a fixed-slope blade retraction action when the generator speed is less than the preset disconnection speed and the pitch angle of the non-faulty blades is greater than the state switching angle threshold.

8. A computer-readable storage medium, characterized in that, The storage medium stores program information, and after the computer reads the program information, it executes the steps of the load reduction control method for single blade jamming fault shutdown of wind turbine as described in any one of claims 1-6.

9. An electronic device comprising a memory, a processor, and a computer program stored in the memory, characterized in that, The processor executes the computer program to implement the load reduction control method for single blade jamming fault shutdown of wind turbine as described in any one of claims 1-6.

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