Method and device for controlling rotating speed of wind generating set under extreme wind power condition

Abstract

The invention belongs to the technical field of wind generating set control, and discloses a wind generating set rotating speed control method and device under the extreme wind power condition. Whether the generator rotating speed change slope is larger than the generator rotating speed change slope threshold upper limit or not and whether the generator rotating speed at the current moment is larger than the generator rotating speed threshold at the current moment or not are judged; if yes, recording the current rotating speed of the generator as a first rotating speed; judging whether the generator speed deviation acceleration is equal to 0; judging whether the current generator rotating speed is smaller than the first rotating speed and whether the generator rotating speed change slope is smaller than the generator rotating speed change slope threshold lower limit; if yes, a final variable pitch rate instruction is obtained; and taking the final variable pitch rate instruction as a variable pitch rate instruction at the current moment. The rotating speed of the generator can be controlled more gently, so that large parts of the wind turbine generator are prevented from experiencing extreme bending moment caused by rapid change of the rotating speed of the generator, and extreme working conditions are prevented.

Description

Technical Field

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

[0002] When the wind speed is above the rated wind speed, the wind turbine will control the impeller to absorb and release wind energy by means of pitch action, thereby controlling the speed of the impeller. When the wind speed changes rapidly, the generator speed will also change rapidly. Especially when the generator speed increases, the kinetic energy of the impeller speed suddenly changes rapidly due to the rapid decrease in wind speed and generator speed. This rapid change in energy will cause the large components of the unit to bear a large change in bending moment. If this wind condition is not effectively controlled for a long time, the large components of the unit may be subjected to extreme loads.

[0003] Traditional wind turbines collect generator speed and control the generator speed to the rated speed for pitch control. However, in the face of rapid changes in generator speed caused by rapid changes in wind speed, there is no effective control method to effectively control the extreme bending formation that the large components of the unit may withstand.

[0004] The existing technical solutions for this problem include: scheduling the speed-pitch control gain, but in order to ensure the stability of the control loop, the rapidity of the control loop cannot be guaranteed, resulting in poor control of the rapid change of the speed. On the other hand, the speed-pitch control loop has a control target of controlling the speed near the rated speed, and it has no targeted design for the rapid increase and decrease of the speed. Its original control target cannot meet the speed control target of the wind turbine generator under extreme wind conditions.

[0005] The Chinese patent publication number is CN116292091A, and the name is a patent application for a method and system for controlling a wind turbine generator set under extreme wind conditions. The method includes the following steps: comparing the size of the generator speed deviation and the generator speed difference judgment value; if the generator speed deviation is less than the generator speed difference judgment value, the generator speed difference judgment value is assigned to the generator speed difference intermediate value; determining the generator speed change judgment value by judging the generator speed difference intermediate value; adjusting the wind turbine operation strategy by comparing the actual value of the speed cabin vibration acceleration with the speed cabin vibration acceleration threshold, judging the timing of changing the operation instruction while issuing a power reduction operation instruction, and citing the relationship between the linear interpolation of the pitch angle and the generator speed difference to ensure that the minimum generator speed difference is reduced while the possible pitch angle is increased; the patent application adopts the generator speed judgment value to avoid the problem of poor control effect caused by the excessively large cabin acceleration judgment part. The patent application cannot solve the problem of extreme bending moment caused by the rapid change of the generator speed caused by the aerodynamic force during the rapid change of the generator speed. 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 changing trend of the generator speed, 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 command is directly superimposed on the original pitch rate command, thereby effectively affecting the aerodynamic influence during the rapid change of the generator speed, thereby controlling the generator speed more gently, thereby avoiding large components of the wind turbine set from experiencing extreme bending moments caused by the rapid changes in the generator speed, and preventing the occurrence of extreme working conditions.

[0007] To achieve the above object, the technical solution adopted by the present invention is: 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: 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, terminate the calculation; if satisfied, record the current generator speed 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 threshold lower limit; if not, terminate the calculation; if satisfied, obtain the final pitch rate instruction; The final pitch rate instruction is used as the pitch rate instruction at the current moment.

[0008] 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.

[0009] 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.

[0010] Optionally, a nonlinear pitch rate instruction is obtained; a pitch rate instruction at a current moment is obtained from a pitch controller; and a final pitch rate instruction is obtained by subtracting the nonlinear pitch rate instruction from the pitch rate instruction at the current moment.

[0011] Optionally, the generator speed threshold at the current moment is 1.05 to 1.1 times the rated speed.

[0012] Optionally, the generator speed change slope threshold is 0.5 to 2 revolutions per minute per second.

[0013] In a second aspect, the present invention provides a wind turbine generator speed control system under extreme wind conditions, comprising: The data acquisition module is used to obtain the generator speed, the generator speed deviation acceleration and the 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 current generator speed is greater than the current generator speed threshold; if not, the calculation is terminated; if satisfied, the current generator speed 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; 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 threshold lower limit; if not satisfied, the calculation is terminated; if satisfied, the final pitch rate instruction is obtained; The output module is used to use the final pitch rate instruction as the pitch rate instruction at the current moment.

[0014] 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.

[0015] In a fourth aspect, the present invention provides 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.

[0016] In a fifth aspect, the present invention provides a computer program product comprising a computer-readable medium, wherein the computer-readable medium contains a 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.

[0017] Compared with the prior art, the present invention has the following beneficial effects: The present invention can establish a generator speed change identification model by directly analyzing the generator speed, which is the unit operating characteristic, and can influence the absorption and release of the unit's aerodynamic force through the pitch action to the greatest extent, thereby reducing the rapid change trend of the generator speed. The present invention directly controls the pitch system under wind conditions where the generator speed is most likely to change rapidly by analyzing the relationship between the current speed change and the nonlinear pitch action, and then quickly performs the pitch action to protect the large components of the wind turbine unit from experiencing as little extreme bending moment as possible under extreme wind conditions, thereby ensuring the safe operation of the large components of the unit under extreme wind conditions.

[0018] Furthermore, the present invention can be implemented by only upgrading the wind turbine control software without installing any other hardware, and the transformation cost is low.

[0019] Furthermore, the present invention combines the control objectives of the original speed-pitch control loop and integrates the rapid change model of the generator speed into the new control objectives. On the basis of ensuring that the generator speed is controlled near the rated speed, the generator speed is ensured to have a relatively smooth transition under extreme wind conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The drawings described herein are for illustration purposes only and are not intended to limit the scope of the present disclosure in any way.

[0021] In the attached picture: Figure 1 This is a flowchart of the steps of Example 1 of the present invention. DETAILED DESCRIPTION

[0022] In order to enable those skilled in the art to better understand the technical solutions in 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 ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0023] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which the present invention belongs. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0024] 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 claims. 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 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. In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined. The present invention is described in detail below with reference to the accompanying drawings.

[0025] A method for controlling the speed of a wind turbine generator set under extreme wind conditions of the present invention comprises the following steps: 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, terminate the calculation; if satisfied, record the current generator speed 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 threshold lower limit; if not, terminate the calculation; if satisfied, obtain the final pitch rate instruction; The final pitch rate instruction is used as the pitch rate instruction at the current moment.

[0026] The present invention effectively identifies the rapid rise and fall of the generator speed due to the rapid change of the extreme wind speed amplitude by judging the change trend of the generator speed. 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 effect during the rapid change of the generator speed, thereby controlling the generator speed more gently, thereby avoiding the large components of the wind turbine set from experiencing extreme bending moments caused by the rapid change of the generator speed, and preventing the occurrence of extreme working conditions.

[0027] Example 1 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: Step 1: Detect and obtain the current generator speed omega_n.

[0028] Step 2: Detect and obtain the current generator speed set point omega_n_sp.

[0029] Step 3: Get the generator speed deviation omega_n_err at the current moment.

[0030] Step 4: Detect and obtain the generator speed omega_l at the previous moment.

[0031] Step 5: Detect and obtain the generator speed set point omega_l_sp at the previous moment.

[0032] Step 6: Subtract the generator speed setting 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.

[0033] 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 omega_err_diff between the generator speed deviations at the previous and next moments.

[0034] Step 8: Get the control cycle.

[0035] 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.

[0036] 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 between the previous and next moments.

[0037] 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.

[0038] 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.

[0039] Step 13: If all conditions in step 12 are not met, terminate the calculation.

[0040] 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.

[0041] 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.

[0042] 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.

[0043] Step 17: If all the conditions in step 16 are not met, terminate the calculation.

[0044] Step 18: If all conditions of step 16 are met, the nonlinear pitch rate command pitchrate_nonlinear is obtained.

[0045] Step 19: Get the current pitch rate command pitchrate_demand from the pitch controller.

[0046] 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.

[0047] Step 21: After duration, force pitchrate_demand_final to be equal to pitchrate_demand.

[0048] The present invention establishes a generator speed rapid change model by determining the rising and falling slopes of the generator speed.

[0049] The present invention establishes a generator speed rapid change model by judging the generator speed change acceleration.

[0050] 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.

[0051] The present invention directly superimposes the pitch rate instruction in a nonlinear pitch control manner to ensure the rapidity of the generator speed through the pitch control.

[0052] The present invention sets the action time in a manner that, under the condition of identifying that a rapid change in the generator speed has occurred, affects the generator speed through a pitch change action for a short time, thereby avoiding the risk of unit operation instability caused by a long-term nonlinear pitch change action.

[0053] The present invention does not require hardware modification, and can be completed by only upgrading the control software, and the modification benefits are significant.

[0054] The present invention adopts a method of calculating the generator speed change acceleration by using the generator speed control deviation to establish a generator speed rapid change model.

[0055] The present invention may also adopt a multi-level control method, where different generator speed rapid change models correspond to different nonlinear pitch rate instructions to improve the rapidity and effectiveness of generator speed control.

[0056] Example 2 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.

[0057] The parameter selection range is: The upper limit of the generator speed change slope threshold is omega_roc_threshold_up0.5~2 revolutions per minute per second; the current generator speed threshold is omega_n_threshold1.05~1.1 times the rated speed; the lower limit of the generator speed change slope threshold omega_roc_threshold_down is -0.5~-2 revolutions per minute per second; pitchrate_nonlinear is 0.5~2 degrees per second; duration is 1~3 seconds.

[0058] Example 3 Based on the method for controlling the speed of a wind turbine generator set under extreme wind conditions in Example 1, a speed control system for a wind turbine generator set under extreme wind conditions is disclosed, comprising: The data acquisition module is used to obtain the generator speed, the generator speed deviation acceleration and the 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 current generator speed is greater than the current generator speed threshold; if not, the calculation is terminated; if satisfied, the current generator speed 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; 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 threshold lower limit; if not satisfied, the calculation is terminated; if satisfied, the final pitch rate instruction is obtained; The output module is used to use the final pitch rate instruction as the pitch rate instruction at the current moment.

[0059] Example 4 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, 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.

[0060] Example 5 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.

[0061] Example 6 The purpose of this embodiment is to provide a computer program product including a computer-readable medium, wherein the computer-readable medium contains a 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.

[0062] 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.

[0063] It should be understood by those skilled in the art that the embodiments of the present application may be provided as methods, systems, or computer program products. Therefore, the present application may adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, the present application may adopt the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program codes. 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 box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes 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 generate 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. These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate 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 1A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes. These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0064] 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.

[0065] Although the preferred embodiments of the present application have been described, those skilled in the art may make other 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 falling within the scope of the present application. Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Other modifications or equivalent substitutions made to the technical solution of the present invention by ordinary technicians in the 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 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; 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 threshold lower limit; If not, the calculation is terminated; if satisfied, the final pitch rate instruction is obtained; 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 setting point at the previous moment, and the generator speed deviation at the current moment; subtract the generator speed setting 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 at the previous moment to obtain the difference in generator speed deviations between the previous and next moments; divide the difference in generator speed deviations between the previous and next moments 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, characterized in that: 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.

4. The method for controlling the speed of a wind turbine generator set under extreme wind conditions according to claim 1, characterized in that: Obtain a nonlinear pitch rate instruction; obtain a current pitch rate instruction from a pitch controller; and subtract the nonlinear pitch rate instruction from the current pitch rate instruction to obtain a final pitch rate instruction.

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

6. 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.

7. 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, the generator speed deviation acceleration and the 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 is used to judge whether the generator speed is less than the first speed at the current moment and whether the generator speed change slope is less than the generator speed change slope threshold lower limit; If not, the calculation is terminated; if satisfied, the final pitch rate instruction is obtained; The output module is used to use the final pitch rate instruction as the pitch rate instruction at the current moment.

8. An electronic device, characterized in that: The method comprises 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 as claimed in any one of claims 1 to 6 when executing the computer program.

9. 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 6 is implemented.

10. A computer program product comprising a computer readable medium, characterized in that The computer-readable medium contains computer-readable program codes, and the program codes execute 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 6.

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