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

Abstract

The present invention belongs to the field of wind turbine generator control technology and discloses a method and device for controlling the speed of a wind turbine generator under extreme wind conditions. The method and device determine whether the generator speed change slope is greater than the upper threshold value of the generator speed change slope and the current generator speed is greater than the current generator speed threshold; if so, the current generator speed is recorded as a first speed; the generator speed deviation acceleration is determined to be equal to 0; the generator speed is determined to be less than the first speed and the generator speed change slope is less than the lower threshold value of the generator speed change slope; if so, the final pitch rate instruction is obtained; and the final pitch rate instruction is used as the current pitch rate instruction. The present invention can relatively gently control the generator speed, thereby preventing large components of the wind turbine from experiencing extreme bending moments caused by rapid changes in the generator speed, thereby preventing the occurrence of extreme operating conditions.

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 and device for controlling the speed of a wind turbine generator set under extreme wind conditions. Background Art

[0002] When wind speeds exceed rated, wind turbines control the absorption and release of wind energy from their impellers through variable pitch motion, thereby controlling the speed of the impellers. When wind speeds fluctuate rapidly, the generator speed also fluctuates rapidly. This is especially true when the generator speed increases, but the wind speed and generator speed drop rapidly at the same time, causing the kinetic energy of the impeller speed to change abruptly. This rapid change in energy can cause large components of the turbine to experience significant bending moments. If these wind conditions are not effectively controlled for an extended period, large components of the turbine may be subjected to extreme loads.

[0003] Traditional wind turbines measure generator speed and adjust pitch control to achieve the rated speed. However, with rapid changes in wind speed, there is no effective control method to effectively manage the extreme bending stresses that large components may experience.

[0004] Existing technical solutions to this problem include adjusting the speed-pitch control gain. However, to ensure control loop stability, this control loop's speed cannot be guaranteed, resulting in poor control of rapid speed changes. Furthermore, the speed-pitch control loop's goal is to maintain speed near the rated speed, but it lacks a specific design for rapid speed fluctuations. Consequently, its original control objective cannot meet the wind turbine's speed control target under extreme wind conditions.

[0005] Chinese patent publication number CN116292091A, entitled "A Method and System for Controlling a Wind Turbine Generator Under Extreme Wind Conditions," includes the following steps: comparing the generator speed deviation with a generator speed difference judgment value; if the generator speed deviation is less than the generator speed difference judgment value, assigning the generator speed difference judgment value to the generator speed difference intermediate value; determining a generator speed change judgment value based on the generator speed difference intermediate value; adjusting the wind turbine operation strategy by comparing the actual value of the nacelle vibration acceleration with the nacelle vibration acceleration threshold; determining the timing of changing the operation command while issuing a power reduction command, and referencing the relationship between the pitch angle and the generator speed difference through linear interpolation to ensure that the minimum generator speed difference is reduced while the pitch angle is increased. This patent application utilizes a generator speed judgment value to avoid the problem of poor control due to an excessively large nacelle acceleration judgment component. This patent application fails to address the extreme bending moments experienced by large components of the wind turbine due to the aerodynamic forces during rapid generator speed changes. Summary of the Invention

[0006] In order to overcome the problems existing in the above-mentioned prior art, the purpose of the present invention is to provide a method and device for controlling the speed of a wind turbine generator set under extreme wind conditions. By judging the trend of the generator speed change, the rapid changes in the generator speed caused by the rapid changes in the extreme wind speed amplitude can be effectively identified. When a large speed increase and decrease trend is found, a nonlinear pitch rate instruction is directly superimposed on the original pitch rate instruction, thereby effectively affecting the aerodynamic influence during the rapid change of the generator speed, thereby controlling the generator speed more gently, and thus avoiding the large components of the wind turbine set from experiencing extreme bending moments caused by the rapid changes in the generator speed, thereby preventing the occurrence of extreme working conditions.

[0007] To achieve the above object, the technical solution adopted by the present invention is:

[0008] In a first aspect, the present invention provides a method for controlling the speed of a wind turbine generator set under extreme wind conditions, comprising the following steps:

[0009] Obtain the current generator speed, generator speed deviation acceleration, and generator speed change slope;

[0010] Determine whether the generator speed change slope is greater than the generator speed change slope threshold upper limit and the current generator speed is greater than the current generator speed threshold; if not, terminate the calculation; if satisfied, record the current generator speed as the first speed;

[0011] Determine whether the generator speed deviation acceleration is equal to 0; if not, terminate the calculation;

[0012] Determine whether the generator speed at the current moment is less than the first speed and whether the generator speed change slope is less than the generator speed change slope lower threshold; if not, terminate the calculation; if satisfied, obtain the final pitch rate instruction;

[0013] The final pitch rate instruction is used as the pitch rate instruction at the current moment.

[0014] Optionally, the generator speed at the previous moment, the generator speed setting point at the previous moment, and the generator speed deviation at the current moment are obtained; the generator speed deviation at the previous moment is obtained by subtracting the generator speed setting point at the previous moment from the generator speed at the previous moment; the generator speed deviation at the current moment is subtracted from the generator speed deviation at the previous moment to obtain the difference between the generator speed deviations at the previous moment; the difference between the generator speed deviations at the previous moment and the previous moment is divided by the control period to obtain the generator speed deviation acceleration.

[0015] Optionally, the generator speed at the previous moment is obtained, and the generator speed difference between the previous moment and the current moment is subtracted from the generator speed at the previous moment; the generator speed difference between the previous moment and the current moment is divided by the control period to obtain the generator speed change slope.

[0016] Optionally, a nonlinear pitch rate instruction is obtained; a current pitch rate instruction is obtained from a pitch controller; and a final pitch rate instruction is obtained by subtracting the nonlinear pitch rate instruction from the current pitch rate instruction.

[0017] Optionally, the generator speed threshold at the current moment is 1.05 to 1.1 times the rated speed.

[0018] Optionally, the generator speed change slope threshold is 0.5 to 2 revolutions per minute per second.

[0019] In a second aspect, the present invention provides a wind turbine generator speed control system under extreme wind conditions, comprising:

[0020] The data acquisition module is used to obtain the generator speed, generator speed deviation acceleration and generator speed change slope at the current moment;

[0021] a first judgment module, configured to judge whether the generator speed change slope is greater than the generator speed change slope threshold upper limit and the current generator speed is greater than the current generator speed threshold; if not, terminating the calculation; if satisfied, recording the current generator speed as the first speed;

[0022] The second judgment module is used to judge whether the generator speed deviation acceleration is equal to 0; if not, the calculation is terminated;

[0023] The third judgment module is used to judge whether the generator speed at the current moment is less than the first speed and whether the generator speed change slope is less than the generator speed change slope lower threshold; if not, the calculation is terminated; if satisfied, the final pitch rate instruction is obtained;

[0024] The output module is used to use the final pitch rate instruction as the pitch rate instruction at the current moment.

[0025] In a third aspect, the present invention provides an electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the method for controlling the speed of a wind turbine generator set under extreme wind conditions when executing the computer program.

[0026] In a fourth aspect, the present invention provides a computer-readable storage medium storing a computer program, which, when executed by a processor, implements the method for controlling the speed of a wind turbine generator set under extreme wind conditions.

[0027] In a fifth aspect, the present invention provides a computer program product comprising a computer-readable medium, wherein the computer-readable medium contains computer-readable program code, and the program code executes the method for controlling the speed of a wind turbine generator set under extreme wind conditions.

[0028] Compared with the prior art, the present invention has the following beneficial effects:

[0029] This invention directly analyzes the generator speed, a characteristic of the wind turbine's operation, to establish a generator speed variation identification model. This model maximizes the absorption and release of aerodynamic forces through pitch control, thereby reducing the tendency for rapid changes in generator speed. By analyzing the relationship between current speed changes and nonlinear pitch control, this invention directly controls the pitch control system in wind conditions most prone to rapid generator speed changes, enabling rapid pitch control. This protects the wind turbine's major components from experiencing extreme bending moments in extreme wind conditions, thereby ensuring their safe operation under these conditions.

[0030] Furthermore, the present invention does not require installation of any other hardware and can be implemented by simply upgrading the wind turbine control software, resulting in low modification costs.

[0031] Furthermore, the present invention combines the control objectives of the original speed-pitch control loop and incorporates the rapid change model of the generator speed into the new control objectives. On the basis of the original guarantee of controlling the generator speed near the rated speed, it ensures a relatively smooth transition of the generator speed under extreme wind conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The drawings described herein are for illustration purposes only and are not intended to limit the scope of the present disclosure in any way.

[0033] In the attached figure:

[0034] Figure 1 This is a flowchart of the steps of Example 1 of the present invention. DETAILED DESCRIPTION

[0035] In order to enable those skilled in the art to better understand the technical solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making any creative efforts should fall within the scope of protection of the present invention.

[0036] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one skilled in the art to which this invention pertains. The terms used in this specification of the present invention are for the purpose of describing specific embodiments only and are not intended to limit the present invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0037] It should be noted that in the claims, any reference signs placed between brackets shall not be construed as limiting the claims. The word "comprising" does not exclude the presence of components or steps not listed in the claim. The word "a" or "an" preceding a component does not exclude the presence of a plurality of such components. The present application may be implemented by means of hardware comprising several different components and by means of a suitably programmed computer. In a unit claim enumerating several means, several of these means may be embodied by one and the same item of hardware. The use of the words first, second, and third etc. does not indicate any order. These words may be interpreted as names.

[0038] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. Throughout the description of this application, "plurality" means two or more, unless otherwise specifically defined.

[0039] The present invention will be described in detail below with reference to the accompanying drawings.

[0040] A method for controlling the speed of a wind turbine generator set under extreme wind conditions according to the present invention comprises the following steps:

[0041] Obtain the current generator speed, generator speed deviation acceleration, and generator speed change slope;

[0042] Determine whether the generator speed change slope is greater than the generator speed change slope threshold upper limit and the current generator speed is greater than the current generator speed threshold; if not, terminate the calculation; if satisfied, record the current generator speed as the first speed;

[0043] Determine whether the generator speed deviation acceleration is equal to 0; if not, terminate the calculation;

[0044] Determine whether the generator speed at the current moment is less than the first speed and whether the generator speed change slope is less than the generator speed change slope lower threshold; if not, terminate the calculation; if satisfied, obtain the final pitch rate instruction;

[0045] The final pitch rate instruction is used as the pitch rate instruction at the current moment.

[0046] The present invention effectively identifies the rapid rise and fall of the generator speed due to the rapid change of extreme wind speed amplitude by judging the trend of the generator speed change. When a large speed rise and fall trend is found, a nonlinear pitch rate instruction is directly superimposed on the original pitch rate instruction, thereby effectively affecting the aerodynamic influence during the rapid change of the generator speed, thereby controlling the generator speed more gently, thereby avoiding the large components of the wind turbine from experiencing extreme bending moments caused by the rapid change of the generator speed, and preventing the occurrence of extreme working conditions.

[0047] Example 1

[0048] like Figure 1 As shown, a method for controlling the speed of a wind turbine generator set under extreme wind conditions of the present invention comprises the following steps:

[0049] Step 1: Detect and obtain the current generator speed omega_n.

[0050] Step 2: Detect and obtain the current generator speed set point omega_n_sp.

[0051] Step 3: Get the generator speed deviation omega_n_err at the current moment.

[0052] Step 4: Detect and obtain the generator speed omega_l at the previous moment.

[0053] Step 5: Detect and obtain the generator speed set point omega_l_sp at the previous moment.

[0054] Step 6: Subtract the generator speed set point omega_l_sp at the previous moment from the generator speed omega_l at the previous moment to obtain the generator speed deviation omega_l_err at the previous moment.

[0055] Step 7: Subtract the generator speed deviation omega_l_err at the previous moment from the current generator speed deviation omega_n_err to obtain the difference in generator speed deviations omega_err_diff.

[0056] Step 8: Get the control cycle.

[0057] Step 9: Divide the difference in generator speed deviation omega_err_diff between the previous and next moments by the control cycle cycle to obtain the generator speed deviation acceleration omega_err_acc.

[0058] Step 10: Subtract the generator speed omega_l at the previous moment from the current generator speed omega_n to obtain the generator speed difference omega_diff.

[0059] Step 11: Divide the generator speed difference omega_diff before and after by the control cycle cycle to obtain the generator speed change slope omega_roc.

[0060] Step 12: Determine whether the generator speed change slope omega_roc is greater than the generator speed change slope threshold upper limit omega_roc_threshold_up, and at the same time determine whether the current generator speed omega_n is greater than the current generator speed threshold omega_n_threshold.

[0061] Step 13: If all the conditions in step 12 are not met, terminate the calculation.

[0062] Step 14: If all conditions in step 12 are met, record the generator speed at the current moment as the first speed omega1 and determine whether the generator speed deviation acceleration omega_err_acc is equal to 0.

[0063] Step 15: If the generator speed deviation acceleration omega_err_acc is not equal to 0, terminate the calculation. If the generator speed deviation acceleration omega_err_acc is equal to 0, proceed to step 16.

[0064] Step 16: Determine whether the generator speed omega_n at the current moment is less than the first speed omega1, and determine whether the generator speed change slope omega_roc is less than the generator speed change slope lower limit omega_roc_threshold_down.

[0065] Step 17: If all the conditions in step 16 are not met, terminate the calculation.

[0066] Step 18: If all conditions in step 16 are met, obtain the nonlinear pitch rate instruction pitchrate_nonlinear.

[0067] Step 19: Get the current pitch rate command pitchrate_demand from the pitch controller.

[0068] Step 20: Subtract the nonlinear pitch rate command pitchrate_nonlinear from the current pitch rate command pitchrate_demand to obtain the final pitch rate command pitchrate_demand_final.

[0069] Step 21: After the duration time, force pitchrate_demand_final to equal pitchrate_demand.

[0070] The present invention establishes a generator speed rapid change model by determining the rising and falling slopes of the generator speed.

[0071] The present invention establishes a generator speed rapid change model by determining the generator speed change acceleration.

[0072] The present invention establishes a generator speed rapid change model by judging that the generator speed exceeds a certain threshold and then becomes less than a certain threshold again.

[0073] The present invention directly superimposes the pitch rate instruction in a nonlinear pitch control manner to ensure the rapidity of the generator speed through pitch control.

[0074] The present invention sets the action time and, under the condition of identifying that a rapid change in the generator speed has occurred, affects the generator speed through a short-term pitch action, thereby avoiding the risk of unit operation instability caused by a long-term nonlinear pitch action.

[0075] The present invention does not require hardware modification and can be completed by only upgrading the control software, and the modification benefits are significant.

[0076] The present invention establishes a generator speed rapid change model by using a generator speed control deviation to calculate the generator speed change acceleration.

[0077] The present invention may also adopt a multi-stage control approach, with different generator speed rapid change models corresponding to different nonlinear pitch rate instructions, so as to improve the rapidity and effectiveness of generator speed control.

[0078] Example 2

[0079] Based on the method of Example 1, in this embodiment, the upper limit of the generator speed change slope threshold omega_roc_threshold_up, the current generator speed threshold omega_n_threshold, the first speed omega1, the lower limit of the generator speed change slope threshold omega_roc_threshold_down, pitchrate_nonlinear, and duration are jointly determined by the simulation results of the wind turbine in a computer environment or the actual test results of the on-site prototype or the actual operation data of the batch operation unit.

[0080] The parameter selection range is:

[0081] The upper limit of the generator speed change slope threshold is omega_roc_threshold_up 0.5 to 2 revolutions per minute per second; the current generator speed threshold is omega_n_threshold 1.05 to 1.1 times the rated speed; the lower limit of the generator speed change slope threshold omega_roc_threshold_down is -0.5 to -2 revolutions per minute per second; pitchrate_nonlinear is 0.5 to 2 degrees per second; and duration is 1 to 3 seconds.

[0082] Example 3

[0083] Based on the wind turbine speed control method under extreme wind conditions of Example 1, a wind turbine speed control system under extreme wind conditions is disclosed, including:

[0084] The data acquisition module is used to obtain the generator speed, generator speed deviation acceleration and generator speed change slope at the current moment;

[0085] a first judgment module, configured to judge whether the generator speed change slope is greater than the generator speed change slope threshold upper limit and the current generator speed is greater than the current generator speed threshold; if not, terminating the calculation; if satisfied, recording the current generator speed as the first speed;

[0086] The second judgment module is used to judge whether the generator speed deviation acceleration is equal to 0; if not, the calculation is terminated;

[0087] The third judgment module is used to judge whether the generator speed at the current moment is less than the first speed and whether the generator speed change slope is less than the generator speed change slope lower threshold; if not, the calculation is terminated; if satisfied, the final pitch rate instruction is obtained;

[0088] The output module is used to use the final pitch rate instruction as the pitch rate instruction at the current moment.

[0089] Example 4

[0090] The purpose of this embodiment is to provide an electronic device, including 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 method for controlling the speed of a wind turbine generator set under extreme wind conditions is implemented.

[0091] Example 5

[0092] The purpose of this embodiment is to provide a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the method for controlling the speed of a wind turbine generator set under extreme wind conditions is implemented.

[0093] Example 6

[0094] The purpose of this embodiment is to provide a computer program product comprising a computer-readable medium, wherein the computer-readable medium contains computer-readable program code, and the program code executes the method for controlling the speed of a wind turbine generator set under extreme wind conditions.

[0095] The steps involved in the devices of the above embodiments 3, 4, 5 and 6 correspond to those of the method embodiment 1. For the specific implementation methods, please refer to the relevant description part of embodiment 1.

[0096] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems, or computer program products. Therefore, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware. Furthermore, the present application may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to magnetic disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0097] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 a process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0098] These computer program instructions may also be stored in a computer readable memory that can direct a computer or other programmable data processing device to work in a specific manner, so that the instructions stored in the computer readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 a process or multiple processes and / or boxes Figure 1 The function specified in one or more boxes.

[0099] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operational steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing the instructions executed on the computer or other programmable device for implementing the process. Figure 1 a process or multiple processes and / or boxes Figure 1 A step that specifies a function in one or more boxes.

[0100] Unless otherwise specified, the working modes or control modes involved in the above embodiments are all conventional working modes or control modes in the art.

[0101] Although the preferred embodiments of the present application have been described, those skilled in the art may make additional changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present application.

[0102] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention and are not limiting. Other modifications or equivalent substitutions made to the technical solution of the present invention by ordinary technicians in this field should be included in the scope of the claims of the present invention as long as they do not depart from the spirit and scope of the technical solution of the present invention.

Claims

1. A method for controlling the speed of a wind turbine generator set under extreme wind conditions, characterized in that: The following steps are involved: Obtain the current generator speed, generator speed deviation acceleration, and generator speed change slope; Determine whether the generator speed change slope is greater than the generator speed change slope threshold upper limit and the current generator speed is greater than the current generator speed threshold; If not, the calculation is terminated; if satisfied, the generator speed at the current moment is recorded as the first speed; Determine whether the generator speed deviation acceleration is equal to 0; if not, terminate the calculation; Determine whether the generator speed at the current moment is less than the first speed and whether the generator speed change slope is less than the generator speed change slope lower limit threshold; If not satisfied, the calculation is terminated; if satisfied, a nonlinear pitch rate instruction is obtained; the current pitch rate instruction is obtained from the pitch controller; the current pitch rate instruction is subtracted from the nonlinear pitch rate instruction to obtain a final pitch rate instruction; The final pitch rate instruction is used as the pitch rate instruction at the current moment.

2. The method for controlling the speed of a wind turbine generator set under extreme wind conditions according to claim 1, characterized in that: Obtain the generator speed at the previous moment, the generator speed set point at the previous moment, and the generator speed deviation at the current moment; subtract the generator speed set point at the previous moment from the generator speed at the previous moment to obtain the generator speed deviation at the previous moment; subtract the generator speed deviation at the current moment from the generator speed deviation to obtain the difference between the generator speed deviations at the previous moment and the next moment; divide the difference between the generator speed deviations at the previous moment and the next moment by the control period to obtain the generator speed deviation acceleration.

3. The method for controlling the speed of a wind turbine generator set under extreme wind conditions according to claim 2, wherein: Obtain the generator speed at the previous moment, subtract the generator speed at the current moment from the generator speed at the previous moment to obtain the generator speed difference between the previous and next moments; divide the generator speed difference between the previous and next moments by the control period to obtain the generator speed change slope.

4. The method for controlling the speed of a wind turbine generator set under extreme wind conditions according to claim 1, characterized in that: The generator speed threshold at the current moment is 1.05 to 1.1 times the rated speed.

5. The method for controlling the speed of a wind turbine generator set under extreme wind conditions according to claim 1, characterized in that: The generator speed change slope threshold is 0.5 to 2 revolutions per minute per second.

6. A wind turbine generator speed control system under extreme wind conditions, characterized in that: include: The data acquisition module is used to obtain the generator speed, generator speed deviation acceleration and generator speed change slope at the current moment; The first judgment module is used to judge whether the generator speed change slope is greater than the generator speed change slope threshold upper limit and the generator speed at the current moment is greater than the generator speed threshold at the current moment; If not, the calculation is terminated; if satisfied, the generator speed at the current moment is recorded as the first speed; The second judgment module is used to judge whether the generator speed deviation acceleration is equal to 0; if not, the calculation is terminated; a third judgment module, configured to judge whether the generator speed at a current moment is less than the first speed and whether the generator speed change slope is less than a generator speed change slope lower threshold; If not satisfied, the calculation is terminated; if satisfied, a nonlinear pitch rate instruction is obtained; the pitch rate instruction at the current moment is obtained from the pitch controller; Subtract the nonlinear pitch rate command from the current pitch rate command to obtain the final pitch rate command; The output module is used to use the final pitch rate instruction as the pitch rate instruction at the current moment.

7. An electronic device, characterized in that: The invention comprises 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 method for controlling the speed of a wind turbine generator set under extreme wind conditions as claimed in any one of claims 1 to 5 is implemented.

8. A computer-readable storage medium, characterized in that The computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the method for controlling the speed of a wind turbine generator set under extreme wind conditions according to any one of claims 1 to 5 is implemented.

9. A computer program product comprising a computer-readable medium, characterized in that The computer-readable medium contains computer-readable program code, and the program code executes the method for controlling the speed of a wind turbine generator set under extreme wind conditions according to any one of claims 1 to 5.

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