A method, system and device for controlling the load of a wind turbine generator set under extreme wind conditions

Abstract

The present invention belongs to the field of wind turbine control technology and relates to a method for controlling the load of a wind turbine generator set under extreme wind conditions. The method first obtains the generator speed deviation acceleration and determines whether the generator speed deviation acceleration is greater than a speed change pitch angle threshold. If the generator speed deviation acceleration is less than the speed change pitch angle threshold, the control process ends; otherwise, wind energy is absorbed by reducing power or changing the pitch angle. At the same time, timing is started to obtain a cumulative time. It is determined whether the cumulative time is greater than a dead time setting parameter. If the cumulative time is greater than the dead time setting parameter, the control process ends; otherwise, time continues to accumulate until the cumulative time equals the dead time setting parameter. The method uses the generator speed change trend as a control input to determine whether the unit is experiencing extreme gust conditions. If so, wind energy absorption is limited by reducing power or changing the pitch angle, thereby reducing the extreme load on large components of the unit, such as the blade root in the out-of-plane direction.

Description

Technical Field

[0001] The present invention belongs to the technical field of wind turbine generator set control, and in particular relates to a method, system and device for controlling the load of a wind turbine generator set under extreme wind conditions. Background Art

[0002] The rotor of a horizontal-axis wind turbine absorbs wind energy and rotates, in turn driving the connected generator to generate electricity. The control objectives of the wind turbine vary depending on wind speed. Above rated wind speed, the control objective is to maintain the turbine speed near the rated speed through pitch control, thereby maintaining the turbine output power near the rated power and ensuring that the mechanical and electrical components of the wind turbine operate normally within the designed range.

[0003] In some extreme wind conditions, the extreme loads on the turbine unit can be detrimental to wind turbine operation. Therefore, it's necessary to adjust the load control strategy to minimize turbine loads in extreme wind conditions, such as those with large wind direction and speed fluctuations. Conventional control methods primarily monitor real-time speed and, based on speed fluctuations, use PI or PID control to determine the corresponding pitch angle. The pitch angle can limit or absorb wind energy. However, the real-time speed is only compared with the reference speed as a control input, and the speed fluctuation trend is not considered. As a result, traditional turbine control methods cannot effectively prevent the occurrence of extreme loads. Summary of the Invention

[0004] The purpose of the present invention is to provide a method, system and device for controlling the load of a wind turbine generator set under extreme wind conditions, which solves the problem that traditional means of set control cannot effectively avoid the occurrence of extreme loads.

[0005] The present invention is achieved through the following technical solutions:

[0006] A method for controlling a load of a wind turbine generator set under extreme wind conditions includes the following steps:

[0007] S1. Obtaining a speed change pitch angle threshold;

[0008] Obtain the difference in generator speed deviation between the previous and next moments;

[0009] S2. Obtain the control period, and obtain the generator speed deviation acceleration based on the difference between the generator speed deviations before and after and the control period;

[0010] S3. Determine whether the generator speed deviation acceleration is greater than the speed change pitch angle threshold:

[0011] If the generator speed deviation acceleration is less than the speed change pitch angle threshold, the control process ends;

[0012] If the generator speed deviation acceleration is greater than the speed change pitch angle threshold, then enter S4;

[0013] S4. Absorb wind energy by reducing power or limiting pitch;

[0014] At the same time, start timing, and accumulate time with the control period as the step length to obtain the accumulated time;

[0015] S5. Obtain dead time setting parameters;

[0016] Determine whether the accumulated time is greater than the dead time setting parameter;

[0017] If the accumulated time is greater than the dead time setting parameter, the control process ends and the accumulated time is set to 0;

[0018] If the accumulated time is less than the dead time setting parameter, the time continues to accumulate until the accumulated time is equal to the dead time setting parameter.

[0019] Furthermore, before performing S1 , it is first determined whether the wind turbine generator set is in a power generation operation state.

[0020] Furthermore, whether the wind turbine is in the power generation state is determined as follows:

[0021] Detect the wind turbine generator generation operation flag and determine whether the flag is 1;

[0022] If the flag is not 1, it means that the unit is not generating electricity and the control process ends;

[0023] If the flag is 1, the control flow starts.

[0024] Furthermore, in S1, the process of obtaining the speed change pitch angle threshold is as follows:

[0025] Detect the pitch position angle of wind turbine blades;

[0026] The speed change pitch angle threshold at this time is found through the blade pitch position angle.

[0027] Furthermore, in S1, the specific calculation of the difference between the generator speed deviations at the previous and next moments includes the following steps:

[0028] 1.1. Detect the current generator speed omega_n;

[0029] Detect the current generator speed set point omega_n_sp;

[0030] 1.2. Subtract the current generator speed set point omega_n_sp from the current generator speed omega_n to obtain the current generator speed deviation omega_n_err;

[0031] 1.3. Detect the generator speed omega_l at the previous moment;

[0032] Detect the generator speed set point omega_l_sp at the previous moment;

[0033] Subtract the generator speed set point omega_l_sp from the generator speed omega_l at the previous moment to obtain the generator speed deviation omega_l_err at the previous moment;

[0034] 1.4. Subtract the generator speed deviation omega_l_err at the previous moment obtained in step 42 from the current generator speed deviation omega_n_err obtained in step 3 to obtain the difference in generator speed deviations omega_err_diff.

[0035] Furthermore, in S2, the difference between the generator speed deviations at the previous and next moments is divided by the control period to obtain the generator speed deviation acceleration.

[0036] Furthermore, in S4, the pitch control restriction method is specifically as follows:

[0037] The pitch is changed at a pitch rate of x degrees per second and superimposed on the original pitch rate instruction.

[0038] Furthermore, in S4, the specific method of reducing power is: performing power limiting operation at a rate of -300 kilowatts per second.

[0039] A control system for controlling a wind turbine generator set load under extreme wind conditions, comprising:

[0040] An acquisition module is used to obtain the speed change pitch angle threshold, the difference in generator speed deviation between the previous and next moments, the control cycle, and the dead time setting parameters;

[0041] The speed deviation acceleration calculation module is used to obtain the generator speed deviation acceleration according to the difference between the generator speed deviations at the previous and next moments and the control period;

[0042] The first judgment module is used to judge whether the generator speed deviation acceleration is greater than the speed change pitch angle threshold:

[0043] If the generator speed deviation acceleration is less than the speed change pitch angle threshold, the control process ends;

[0044] If the generator speed deviation acceleration is greater than the speed change pitch angle threshold, the wind energy is absorbed by reducing power or limiting pitch;

[0045] At the same time, start the timing module;

[0046] The timing module is used to accumulate time with the control period as the step length to obtain the accumulated time;

[0047] The second judgment module is used to judge whether the accumulated time is greater than the dead time setting parameter;

[0048] If the accumulated time is greater than the dead time setting parameter, the control process ends and the accumulated time is set to 0;

[0049] If the accumulated time is less than the dead time setting parameter, the time continues to accumulate until the accumulated time is equal to the dead time setting parameter.

[0050] The present invention also discloses a computer device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the steps of the control method are implemented when the processor executes the computer program.

[0051] Compared with the prior art, the present invention has the following beneficial technical effects:

[0052] The present invention provides a method for controlling a wind turbine generator set under extreme wind conditions, replacing existing solutions that rely solely on generator speed measurement to schedule pitch control. This method more specifically addresses the impact of extreme loads caused by rapid changes in wind speed and direction. The present invention uses real-time generator speed data and determines its changing trends, using these trends as control inputs to determine whether the turbine is experiencing extreme gust conditions. If so, the method limits wind energy absorption by reducing power or adjusting pitch, thereby reducing the extreme loads on major turbine components, such as the blade roots. Furthermore, the load control duration is determined by time accumulation, avoiding unstable turbine operation caused by prolonged load control. The present invention achieves wind turbine load control solely by detecting generator speed, eliminating the need for additional detection hardware. With the trend toward larger wind turbine capacities and larger blades and taller towers, the extreme loads encountered by wind turbines are reduced, allowing for smaller structural dimensions, thereby reducing manufacturing costs and easing transportation constraints. BRIEF DESCRIPTION OF THE DRAWINGS

[0053] Figure 1 This is a specific flow chart of a method for controlling the load of a wind turbine generator set under extreme wind conditions according to the present invention;

[0054] Figure 2This is a block diagram of the module connection principle of a control system for a wind turbine generator set load under extreme wind conditions according to the present invention. DETAILED DESCRIPTION

[0055] In order to make the purpose, technical solutions and advantages of the present invention more clear, the following is a further detailed description with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention. That is, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments.

[0056] The components described and illustrated in the drawings and embodiments of the present invention may be arranged and designed in a variety of different configurations. Therefore, the detailed description of the embodiments of the present invention provided in the following drawings is not intended to limit the scope of the claimed invention, but merely represents a selected embodiment of the present invention. All other embodiments derived by those skilled in the art based on the drawings and embodiments of the present invention without inventive effort shall fall within the scope of protection of the present invention.

[0057] It should be noted that the terms "comprises", "includes" or any other variations are intended to cover non-exclusive inclusion, so that a process, element, method, article or apparatus that includes a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to the process, element, method, article or apparatus.

[0058] like Figure 1 As shown, the present invention discloses a method for controlling the load of a wind turbine generator set under extreme wind conditions, comprising the following processes:

[0059] S1. Obtaining a speed change pitch angle threshold;

[0060] Obtain the difference in generator speed deviation between the previous and next moments;

[0061] S2. Obtain the control period, and obtain the generator speed deviation acceleration based on the difference between the generator speed deviations before and after and the control period;

[0062] S3. Determine whether the generator speed deviation acceleration is greater than the speed change pitch angle threshold:

[0063] If the generator speed deviation acceleration is less than the speed change pitch angle threshold, the control process ends;

[0064] If the generator speed deviation acceleration is greater than the speed change pitch angle threshold, then enter S4;

[0065] S4. Absorb wind energy by reducing power or limiting pitch;

[0066] At the same time, the timing starts, and the control cycle is the step length to accumulate time to obtain the accumulated time;

[0067] S5. Obtain dead time setting parameters;

[0068] Determine whether the accumulated time is greater than the dead time setting parameter;

[0069] If the accumulated time is greater than the dead time setting parameter, it means that the load control action time domain has expired, the control process ends, and the accumulated time is set to 0;

[0070] If the accumulated time is less than the dead time setting parameter, it means that the load control action time domain has not yet arrived, and the time continues to accumulate until the accumulated time is equal to the dead time setting parameter.

[0071] The features and performance of the present invention are further described in detail below with reference to the embodiments.

[0072] Example 1

[0073] The present invention discloses a method for controlling the load of a wind turbine generator set under extreme wind conditions, which is characterized by comprising the following processes:

[0074] The first step is to detect the wind turbine generator generation operation flag. This method only operates in the power generation condition, so it is necessary to determine whether the flag is 1.

[0075] If the flag is not 1, it means that the unit is not generating electricity and the control process ends;

[0076] If the flag is 1, the control flow starts;

[0077] The second step is to detect the pitch angle of the wind turbine blades;

[0078] Get the speed change pitch angle threshold omegaacc_pitch_threshold, which has a one-to-one correspondence with the blade pitch position angle pitch;

[0079] Specifically, the blade pitch position angle pitch is used to find the speed change pitch angle threshold omegaacc_pitch_threshold at this time;

[0080] The third step is to detect the current generator speed omega_n;

[0081] Detect the current generator speed set point omega_n_sp;

[0082] Subtract the current generator speed set point omega_n_sp from the current generator speed omega_n to obtain the current generator speed deviation omega_n_err;

[0083] Step 4: Detect the generator speed omega_l at the previous moment;

[0084] Detect the generator speed set point omega_l_sp at the previous moment;

[0085] Subtract the generator speed set point omega_l_sp from the generator speed omega_l at the previous moment to obtain the generator speed deviation omega_l_err at the previous moment;

[0086] Step 5: Subtract the generator speed deviation omega_l_err at the previous moment obtained in step 42 from the current generator speed deviation omega_n_err obtained in step 3, thereby obtaining the difference in generator speed deviations omega_err_diff between the previous and next moments.

[0087] Step 6. Get the control cycle, which is generally set according to the performance of the PLC main controller and can be set to 0.02 seconds;

[0088] Step 7: Divide the difference in generator speed deviation omega_err_diff obtained in step 5 by the obtained control cycle cycle to obtain the generator speed deviation acceleration omega_err_acc;

[0089] Step 8: Determine whether the generator speed deviation acceleration omega_err_acc obtained in step 7 is greater than the speed change pitch angle threshold omegaacc_pitch_threshold obtained in step 2;

[0090] Step 9. If omega_err_acc is greater than omegaacc_pitch_threshold, it indicates that the generator speed fluctuates violently and the large components of the unit may experience extreme loads, so go to step 10.

[0091] Step 10: The speed-pitch controller gives a pitch rate of 2 degrees per second superimposed on the original pitch rate instruction;

[0092] At the same time, start timing, starting with time = 0, and accumulate time with cycle as the step length to get the accumulated time time;

[0093] Step 11. Get the dead time setting parameter Durationtime;

[0094] Determine whether the accumulated time is greater than the dead time setting parameter Durationtime;

[0095] If time is greater than Durationtime, it means that the load control action time domain has expired, the control process ends, and time is set to 0.

[0096] Example 2

[0097] The tenth step is different from the first embodiment, in that the speed-pitch controller performs power limiting operation at a rate of -300 kilowatts per second.

[0098] Example 3

[0099] The eleventh step is different. If the result of the judgment is that time is less than Durationtime, it means that the load control action time domain has not yet arrived, and time continues to accumulate until the accumulated time is equal to Durationtime.

[0100] Example 4

[0101] The present invention discloses a method for controlling the load of a wind turbine generator set under extreme wind conditions, which is characterized by comprising the following processes:

[0102] The first step is to detect the wind turbine generator generation operation flag. This method only operates in the power generation condition, so it is necessary to determine whether the flag is 1.

[0103] If the flag is not 1, it means that the unit is not generating electricity and the control process ends;

[0104] If the flag is 1, the control flow starts;

[0105] The second step is to detect the pitch angle of the wind turbine blades;

[0106] Get the speed change pitch angle threshold omegaacc_pitch_threshold, which has a one-to-one correspondence with the blade pitch position angle pitch;

[0107] Specifically, the blade pitch position angle pitch is used to find the speed change pitch angle threshold omegaacc_pitch_threshold at this time;

[0108] The third step is to detect the current generator speed omega_n;

[0109] Detect the current generator speed set point omega_n_sp;

[0110] Subtract the current generator speed set point omega_n_sp from the current generator speed omega_n to obtain the current generator speed deviation omega_n_err;

[0111] Step 4: Detect the generator speed omega_l at the previous moment;

[0112] Detect the generator speed set point omega_l_sp at the previous moment;

[0113] Subtract the generator speed set point omega_l_sp from the generator speed omega_l at the previous moment to obtain the generator speed deviation omega_l_err at the previous moment;

[0114] Step 5: Subtract the generator speed deviation omega_l_err at the previous moment obtained in step 42 from the current generator speed deviation omega_n_err obtained in step 3, thereby obtaining the difference in generator speed deviations omega_err_diff between the previous and next moments.

[0115] Step 6. Get the control cycle, which is generally set according to the performance of the PLC main controller and can be set to 0.02 seconds;

[0116] Step 7: Divide the difference in generator speed deviation omega_err_diff obtained in step 5 by the obtained control cycle cycle to obtain the generator speed deviation acceleration omega_err_acc;

[0117] Step 8: Determine whether the generator speed deviation acceleration omega_err_acc obtained in step 7 is greater than the speed change pitch angle threshold omegaacc_pitch_threshold obtained in step 2;

[0118] Step 9. If omega_err_acc is less than omegaacc_pitch_threshold, it means that the generator speed change trend is not as expected, and the control process ends.

[0119] Example 5

[0120] The present invention discloses a method for controlling the load of a wind turbine generator set under extreme wind conditions, which is characterized by comprising the following processes:

[0121] The first step is to detect the wind turbine generator generation operation flag. This method only operates in the power generation condition, so it is necessary to determine whether the flag is 1.

[0122] If the flag is not 1, it means that the unit is not generating electricity and the control process ends;

[0123] If the flag is 1, the control flow starts;

[0124] The second step is to detect the pitch angle of the wind turbine blades;

[0125] Get the speed change pitch angle threshold omegaacc_pitch_threshold, which has a one-to-one correspondence with the blade pitch position angle pitch;

[0126] Specifically, the blade pitch position angle pitch is used to find the speed change pitch angle threshold omegaacc_pitch_threshold at this time;

[0127] The third step is to detect the current generator speed omega_n;

[0128] Detect the current generator speed set point omega_n_sp;

[0129] Subtract the current generator speed set point omega_n_sp from the current generator speed omega_n to obtain the current generator speed deviation omega_n_err;

[0130] Step 4: Detect the generator speed omega_l at the previous moment;

[0131] Detect the generator speed set point omega_l_sp at the previous moment;

[0132] Subtract the generator speed set point omega_l_sp from the generator speed omega_l at the previous moment to obtain the generator speed deviation omega_l_err at the previous moment;

[0133] Step 5: Subtract the generator speed deviation omega_l_err at the previous moment obtained in step 42 from the current generator speed deviation omega_n_err obtained in step 3, thereby obtaining the difference in generator speed deviations omega_err_diff between the previous and next moments.

[0134] Step 6. Get the control cycle, which is generally set according to the performance of the PLC main controller and can be set to 0.02 seconds;

[0135] Step 7: Divide the difference in generator speed deviation omega_err_diff obtained in step 5 by the obtained control cycle cycle to obtain the generator speed deviation acceleration omega_err_acc;

[0136] Step 8: Determine whether the generator speed deviation acceleration omega_err_acc obtained in step 7 is greater than the speed change pitch angle threshold omegaacc_pitch_threshold obtained in step 2;

[0137] Step 9: omega_err_acc is greater than omegaacc_pitch_threshold, indicating that the generator speed fluctuates violently and the large components of the unit may experience extreme loads, so proceed to step 10;

[0138] Step 10: The speed-pitch controller gives a pitch rate of 2 degrees per second superimposed on the original pitch rate instruction;

[0139] At the same time, start timing, starting with time = 0, and accumulate time with cycle as the step length to get the accumulated time time;

[0140] Step 11. Get the dead time setting parameter Durationtime;

[0141] Determine whether the accumulated time is greater than the dead time setting parameter Durationtime;

[0142] If time is greater than Durationtime, it means that the load control action time domain has expired, the control process ends, and time is set to 0.

[0143] The present invention can reduce the ultimate load of the unit caused by drastic changes in the generator speed due to extreme wind conditions, and can effectively reduce the ultimate load encountered by the wind turbine by reducing power or changing the pitch.

[0144] Violent fluctuations in generator speed indicate that the unit is experiencing extreme wind conditions. Reducing power or changing pitch at this moment can limit the absorption of wind energy to a certain extent and avoid serious accidents such as blades sweeping the tower or unit overturning.

[0145] The present invention adopts a method of reducing power or changing pitch, but is not limited to this method. Other methods include reducing the generator speed, performing yaw control, etc.

[0146] Example 6

[0147] like Figure 2 As shown, the present invention discloses a control system for a wind turbine generator set load under extreme wind conditions, comprising:

[0148] An acquisition module is used to obtain the speed change pitch angle threshold, the difference in generator speed deviation between the previous and next moments, the control cycle, and the dead time setting parameters;

[0149] The speed deviation acceleration calculation module is used to obtain the generator speed deviation acceleration according to the difference between the generator speed deviations at the previous and next moments and the control period;

[0150] The first judgment module is used to judge whether the generator speed deviation acceleration is greater than the speed change pitch angle threshold:

[0151] If the generator speed deviation acceleration is less than the speed change pitch angle threshold, the control process ends;

[0152] If the generator speed deviation acceleration is greater than the speed change pitch angle threshold, the wind energy is absorbed by reducing power or limiting pitch;

[0153] At the same time, start the timing module;

[0154] The timing module is used to accumulate time with the control period as the step length to obtain the accumulated time;

[0155] The second judgment module is used to judge whether the accumulated time is greater than the dead time setting parameter;

[0156] If the accumulated time is greater than the dead time setting parameter, it means that the load control action time domain has expired, the control process ends, and the accumulated time is set to 0;

[0157] If the accumulated time is less than the dead time setting parameter, it means that the load control action time domain has not yet arrived, and the time continues to accumulate until the accumulated time is equal to the dead time setting parameter.

[0158] Example 7

[0159] The present invention discloses a computer device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, the steps of the control method for the distribution network topology are implemented. The memory may include a memory, such as a high-speed random access memory, and may also include a non-volatile memory, such as at least one disk storage device. The processor, network interface, and memory are interconnected via an internal bus. The internal bus may be an industrial standard architecture bus, a peripheral component interconnect standard bus, an extended industrial standard architecture bus, etc. The bus may be divided into an address bus, a data bus, a control bus, etc. The memory is used to store programs. Specifically, the program may include program code, and the program code includes computer operating instructions. The memory may include memory and non-volatile memory, and provides instructions and data to the processor.

[0160] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the field should understand that the specific implementation methods of the present invention can still be modified or replaced by equivalents. Any modification or equivalent replacement that does not depart from the spirit and scope of the present invention should be covered by the scope of protection of the claims of the present invention.

Claims

1. A method for controlling the load of a wind turbine generator set under extreme wind conditions, characterized in that: The following processes are included: S1. Obtaining a speed change pitch angle threshold; Obtain the difference in generator speed deviation between the previous and next moments; S2. Obtain the control period, and obtain the generator speed deviation acceleration based on the difference between the generator speed deviations before and after and the control period; S3. Determine whether the generator speed deviation acceleration is greater than the speed change pitch angle threshold: If the generator speed deviation acceleration is less than the speed change pitch angle threshold, the control process ends; If the generator speed deviation acceleration is greater than the speed change pitch angle threshold, then enter S4; S4. Absorb wind energy by reducing power or limiting pitch; At the same time, start timing, and accumulate time with the control period as the step length to obtain the accumulated time; S5. Obtain dead time setting parameters; Determine whether the accumulated time is greater than the dead time setting parameter; If the accumulated time is greater than the dead time setting parameter, the control process ends and the accumulated time is set to 0; If the accumulated time is less than the dead time setting parameter, the time continues to accumulate until the accumulated time is equal to the dead time setting parameter.

2. The method for controlling the load of a wind turbine generator set under extreme wind conditions according to claim 1, characterized in that: Before performing S1, it is first determined whether the wind turbine generator set is in a power generation operation state.

3. The method for controlling the load of a wind turbine generator set under extreme wind conditions according to claim 2, characterized in that: The specific steps to determine whether a wind turbine is in power generation operation are: Detect the wind turbine generator generation operation flag and determine whether the flag is 1; If the flag is not 1, it means that the unit is not generating electricity and the control process ends; If the flag is 1, the control flow starts.

4. The method for controlling the load of a wind turbine generator set under extreme wind conditions according to claim 1, characterized in that: In S1, the process of obtaining the speed change pitch angle threshold is as follows: Detect the pitch position angle of wind turbine blades; The speed change pitch angle threshold at this time is found through the blade pitch position angle.

5. The method for controlling the load of a wind turbine generator set under extreme wind conditions according to claim 1, characterized in that: In S1, the specific calculation of the difference in generator speed deviation between the previous and next moments includes the following steps: 1.

1. Detect the current generator speed omega_n; Detect the current generator speed set point omega_n_sp; 1.

2. Subtract the current generator speed set point omega_n_sp from the current generator speed omega_n to obtain the current generator speed deviation omega_n_err; 1.

3. Detect the generator speed omega_l at the previous moment; Detect the generator speed set point omega_l_sp at the previous moment; Subtract the generator speed set point omega_l_sp from the generator speed omega_l at the previous moment to obtain the generator speed deviation omega_l_err at the previous moment; 1.

4. Subtract the generator speed deviation omega_l_err at the previous moment obtained in step 42 from the current generator speed deviation omega_n_err obtained in step 3 to obtain the difference in generator speed deviations omega_err_diff.

6. The method for controlling the load of a wind turbine generator set under extreme wind conditions according to claim 1, characterized in that: In S2, the difference between the generator speed deviations at the previous and next moments is divided by the control period to obtain the generator speed deviation acceleration.

7. The method for controlling the load of a wind turbine generator set under extreme wind conditions according to claim 1, characterized in that: In S4, the pitch limit method is as follows: The pitch is changed at a pitch rate of 2 degrees per second and superimposed on the original pitch rate instruction.

8. The method for controlling the load of a wind turbine generator set under extreme wind conditions according to claim 1, characterized in that: In S4, the specific method of reducing power is: limiting power operation at a rate of -300 kilowatts per second.

9. A control system for wind turbine loads under extreme wind conditions, characterized in that: include: An acquisition module is used to obtain the speed change pitch angle threshold, the difference in generator speed deviation between the previous and next moments, the control cycle, and the dead time setting parameters; The speed deviation acceleration calculation module is used to obtain the generator speed deviation acceleration according to the difference between the generator speed deviations at the previous and next moments and the control period; The first judgment module is used to judge whether the generator speed deviation acceleration is greater than the speed change pitch angle threshold: If the generator speed deviation acceleration is less than the speed change pitch angle threshold, the control process ends; If the generator speed deviation acceleration is greater than the speed change pitch angle threshold, the wind energy is absorbed by reducing power or limiting pitch; At the same time, start the timing module; The timing module is used to accumulate time with the control period as the step length to obtain the accumulated time; The second judgment module is used to judge whether the accumulated time is greater than the dead time setting parameter; If the accumulated time is greater than the dead time setting parameter, the control process ends and the accumulated time is set to 0; If the accumulated time is less than the dead time setting parameter, the time continues to accumulate until the accumulated time is equal to the dead time setting parameter.

10. A computer device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein: When the processor executes the computer program, the steps of the control method according to any one of claims 1 to 8 are implemented.

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