Wind turbine anti-over-speed control method and device facing gust and medium

Abstract

The application provides a kind of gust-oriented wind turbine unit overspeed prevention control method, device and medium, belong to wind turbine unit control field.The method comprises: obtaining real-time wind speed data and generator speed data;According to real-time wind speed data, determine whether to enter the gust mode of wind turbine unit;In the case of entering gust mode, adjust the minimum pitch angle of wind turbine unit operation to be the minimum pitch angle of gust mode operation;According to generator speed data, calculate generator speed acceleration;According to generator speed data and generator speed acceleration, determine whether to enter acceleration overspeed prevention control strategy;In the case of determining to enter acceleration overspeed prevention control strategy, superimpose preset pitch rate on normal pitch rate.In the gust mode, the pitch angle in the operation of wind turbine unit is raised, so that the angle of attack margin of blade can be kept in a safe range, and after entering the acceleration overspeed prevention control strategy, superimpose preset pitch rate on normal pitch rate.

Description

Technical Field

[0001] This invention relates to the field of wind turbine generator control technology, specifically to a wind turbine generator anti-overspeed control method for gusts, a wind turbine generator anti-overspeed control device for gusts, and a machine-readable storage medium. Background Technology

[0002] Wind turbines utilize wind energy to drive the rotor, converting wind energy into electrical energy. The characteristics of wind are a crucial factor affecting the stable operation of wind turbines. Wind changes are random and sudden, with strong gusts characterized by drastic changes in wind speed over a short period. Wind turbines operating under strong gust conditions are susceptible to significant wind shear impacts, increasing the operational risks.

[0003] Once a wind turbine reaches its rated speed, the control system maintains stable speed by controlling the pitch. However, under extreme conditions of strong gusts, where wind speeds decrease and then rapidly increase again, the pitch actuator's response capability is limited, causing the pitch retraction position to fail. This results in a rapid increase in turbine speed, exceeding the control system's speed protection limit and triggering an overspeed shutdown. In strong gusts, wind turbines are prone to frequent overspeed shutdowns, leading to power generation losses.

[0004] Currently, wind turbine control systems employ a method that triggers overspeed protection only after the turbine speed exceeds a protection threshold, resulting in significant lag. By the time the overspeed protection is activated, the turbine is already in an overspeed state. This control method not only fails to promptly suppress the increase in speed but also leads to frequent feathering actions, impacting the lifespan of pitch system components. Therefore, effectively reducing the frequent overspeeding of wind turbines under gusty wind conditions is an urgent problem to be solved. Summary of the Invention

[0005] The purpose of this invention is to provide a method, device, and medium for overspeed control of wind turbine generator sets in the face of gusts. This method adjusts the minimum pitch angle of the wind turbine generator set to the minimum pitch angle for gust mode operation when entering gust mode, thereby raising the pitch angle during operation. This ensures that the blade angle of attack margin remains within a safe range under gust conditions. Simultaneously, after determining the acceleration-based overspeed control strategy based on the generator speed acceleration, a preset pitch rate is superimposed on the normal pitch rate to ensure faster pitch retraction under gust conditions, suppressing the increase in generator speed. The combined effect of these two strategies effectively prevents overspeeding caused by frequent wind speed fluctuations and untimely pitch response in gust conditions with drastic wind speed changes.

[0006] To achieve the above objectives, a first aspect of the present invention provides a method for overspeed prevention control of wind turbine generator sets oriented towards gusts, the method comprising:

[0007] Acquire real-time wind speed data and generator speed data;

[0008] Determine whether to enter the gust mode of the wind turbine generator based on real-time wind speed data;

[0009] When entering gust mode, adjust the minimum pitch angle of the wind turbine generator set to the minimum pitch angle for gust mode operation.

[0010] Calculate the generator speed acceleration based on the generator speed data;

[0011] Determine whether to enter the acceleration overspeed prevention control strategy based on generator speed data and generator speed acceleration.

[0012] When the acceleration overspeed prevention control strategy is determined, a preset pitch rate is superimposed on the normal pitch rate.

[0013] Based on the above technical means, when entering gust mode, the minimum pitch angle of the wind turbine is adjusted to the minimum pitch angle of gust mode operation, which raises the pitch angle of the wind turbine during operation. This ensures that the blade angle of attack margin can be kept within a safe range when the unit is operating in gust conditions. At the same time, after determining the acceleration overspeed prevention control strategy based on the generator speed acceleration, a preset pitch rate is superimposed on the normal pitch rate to ensure that the pitch can be retracted more quickly in gust conditions and suppress the rise of generator speed.

[0014] In some feasible embodiments, determining whether to enter the gust mode of the wind turbine generator based on real-time wind speed data includes:

[0015] Compare real-time wind speed data with the threshold for gust mode entry;

[0016] If the real-time wind speed data is greater than the threshold for entering gust mode and the duration is greater than the first set time, then it is determined that the gust mode of the wind turbine generator will be entered.

[0017] Otherwise, ensure that the wind turbine generator remains in its current operating mode.

[0018] Based on the above technical means, the wind speed is compared with the gust mode entry threshold to determine whether to enter gust mode. At the same time, the wind speed must be greater than the gust mode entry threshold and continue for a first set time to make the determination, so as to avoid frequent switching of wind turbine mode caused by the wind speed reaching the gust mode entry threshold at a single moment.

[0019] In some feasible embodiments, adjusting the minimum pitch angle of the wind turbine generator to the minimum pitch angle for gust mode operation includes:

[0020] The minimum pitch angle of the wind turbine in gust mode is determined from the wind speed-pitch angle curve of the wind turbine operation based on real-time wind speed data.

[0021] Adjust the minimum pitch angle of the wind turbine generator set to the minimum pitch angle of the generator set in gust mode.

[0022] Based on the aforementioned technical means, the minimum pitch angle of the wind turbine in gust mode, determined from the wind speed-pitch angle curve of the wind turbine operation based on real-time wind speed data, can be adjusted in real time according to the current wind speed. The change in the minimum pitch angle can keep the blade angle of attack margin within a safe range.

[0023] In some feasible embodiments, the method further includes:

[0024] When the wind turbine enters gust mode and reaches the set operating time limit, or meets the conditions for exiting gust mode, the wind turbine will be switched back to normal operating mode.

[0025] Based on the above technical means, exit conditions are set for gust mode to avoid excessive blade load and affect the service life of wind turbines when they operate in gust mode for a long time.

[0026] In some feasible embodiments, the gust mode exit condition includes:

[0027] The real-time wind speed data is less than the wind speed threshold for exiting gust mode and the duration exceeds the second set time.

[0028] Based on the aforementioned technical means, the set exit conditions for gust mode include a second set time, which avoids frequent switching of wind turbine generator modes.

[0029] In some feasible embodiments, calculating the generator speed acceleration based on generator speed data includes:

[0030] An asymmetric asynchronous sliding structure is used to filter the generator speed data;

[0031] Calculate generator speed acceleration based on filtered generator speed data.

[0032] In some feasible embodiments, an asymmetric asynchronous sliding structure is used to filter the generator speed data, including:

[0033] During the speed increase process, an asynchronous sliding structure with a first step length is used to filter the generator speed data, and during the speed decrease process, an asynchronous sliding structure with a second step length is used to filter the generator speed data. The first step length is smaller than the second step length.

[0034] Based on the above technical means, after the generator speed data is filtered by the asynchronous sliding structure, the changes in the speed increase phase are more drastic and closer to the actual speed changes, while the changes in the speed decrease phase are more gradual. This enables the unit to quickly enter and slowly exit the overspeed prevention process, preventing the unit from overspeeding again due to a sudden increase in wind speed during the overspeed prevention exit and the speed reduction and propeller opening process, which would prevent the propeller from being pulled back in time.

[0035] In some feasible embodiments, determining whether to enter the acceleration overspeed prevention control strategy based on generator speed data and generator speed acceleration includes:

[0036] Compare the generator speed data with the overspeed warning speed value;

[0037] If the generator speed is greater than the overspeed warning speed value, the generator speed acceleration is compared with the acceleration overspeed prevention threshold.

[0038] If the generator speed acceleration is greater than the acceleration overspeed prevention threshold, then the acceleration overspeed prevention control strategy will be entered.

[0039] The acceleration overspeed prevention threshold is determined by the speed fluctuation characteristics of the wind turbine generator set operating under gusty wind conditions.

[0040] Based on the above technical means, the generator speed is first compared. If the generator speed is greater than the overspeed warning speed value, the generator speed acceleration is further compared with the acceleration overspeed prevention threshold to determine whether to enter the acceleration overspeed prevention control strategy. The generator speed acceleration reflects the changing trend of the generator speed. When the generator speed acceleration exceeds the threshold, the subsequent speed change will be faster and faster, and the risk of overspeed will be greater. The acceleration overspeed prevention control strategy is entered in advance to achieve early action to protect the wind turbine generator.

[0041] A second aspect of this application provides an overspeed prevention control device for wind turbine generator sets resistant to gusts of wind, the device comprising:

[0042] The data acquisition unit is used to acquire real-time wind speed data and generator speed data;

[0043] The gust mode determination unit is used to determine whether to enter the gust mode of the wind turbine generator based on real-time wind speed data.

[0044] The minimum pitch angle adjustment unit is used to adjust the minimum pitch angle of the wind turbine generator set to the minimum pitch angle of the gust mode when entering gust mode.

[0045] An acceleration calculation unit is used to calculate the generator speed acceleration based on the generator speed data.

[0046] The acceleration overspeed prevention judgment unit is used to determine whether to enter the acceleration overspeed prevention control strategy based on the generator speed data and the generator speed acceleration.

[0047] The pitch rate adjustment unit is used to superimpose a preset pitch rate on the normal pitch rate when the acceleration overspeed prevention control strategy is determined to be entered.

[0048] Based on the aforementioned technical means, when entering gust mode, the device adjusts the minimum pitch angle of the wind turbine generator set to the minimum pitch angle of gust mode operation, thereby raising the pitch angle of the wind turbine generator set during operation. This ensures that the blade angle of attack margin can be kept within a safe range when the unit is operating in gust conditions. At the same time, after determining the acceleration anti-overspeed control strategy based on the generator speed acceleration, a preset pitch rate is superimposed on the normal pitch rate to ensure that the pitch can be retracted more quickly in gust conditions, suppressing the rise in generator speed.

[0049] A third aspect of this application provides a machine-readable storage medium storing instructions for causing a machine to execute the aforementioned wind turbine overspeed control method for gust-oriented wind turbines.

[0050] Through the above technical solutions, the control strategy adopted in this application, based on the gust mode, can effectively prevent turbine overspeed caused by large and drastic fluctuations in wind speed, while the acceleration-based overspeed prevention control strategy can effectively prevent turbine overspeed caused by small and drastic changes in wind speed. The combination of these two strategies can significantly reduce the number and duration of wind turbine shutdowns due to overspeed failures under severe gust wind conditions, ensuring the safe and stable operation of the wind turbine and reducing the power generation losses due to overspeed failure shutdowns. Furthermore, this application can reduce the frequency of pitch system operation under gust wind conditions, reduce wear and tear on pitch system components, and extend their service life.

[0051] Other features and advantages of the embodiments of the present invention will be described in detail in the following detailed description section. Attached Figure Description

[0052] The accompanying drawings are provided to further illustrate embodiments of the present invention and form part of the specification. They are used together with the following detailed description to explain the embodiments of the present invention, but do not constitute a limitation thereof. In the drawings:

[0053] Figure 1 This is a flowchart of a wind turbine generator set overspeed control method for gust winds provided by one embodiment of the present invention;

[0054] Figure 2 This is a step diagram of a wind turbine generator set overspeed control method for gust winds provided by one embodiment of the present invention;

[0055] Figure 3 This is a flowchart of a gust mode control strategy provided by one embodiment of the present invention;

[0056] Figure 4 This is a flowchart of an acceleration overspeed prevention control strategy provided by one embodiment of the present invention;

[0057] Figure 5 This is a block diagram of a wind turbine generator set overspeed control device for gust winds, provided in one embodiment of the present invention. Detailed Implementation

[0058] The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0059] This application provides a method for preventing overspeed control of wind turbine generators in the face of gusts. This method can be deployed in the main controller of the wind turbine generator or a separate controller can be deployed to prevent overspeed control of the wind turbine generator.

[0060] Figure 1 This is a flowchart of a wind turbine generator overspeed prevention control method for gust winds, provided by one embodiment of the present invention. Figure 1 As shown, this invention provides a method for preventing overspeed of a wind turbine generator set in the face of gusts, the method comprising:

[0061] S1: Acquire real-time wind speed data and generator speed data. In some feasible embodiments, the real-time wind speed data is collected by an anemometer installed on the wind turbine and transmitted to the wind turbine main controller. The generator speed data is collected by a data acquisition device installed at the corresponding location on the generator and transmitted to the wind turbine main controller.

[0062] S2: Determine whether to enter the gust mode of the wind turbine generator based on real-time wind speed data.

[0063] In some feasible embodiments, determining whether to enter the gust mode of the wind turbine generator based on real-time wind speed data includes:

[0064] Real-time wind speed data is compared with the gust mode entry threshold, which is set according to the operation of the wind turbine in gust wind conditions to prevent the wind turbine from overspeeding.

[0065] If the real-time wind speed data is greater than the threshold for entering gust mode and the duration is greater than the first set time, then it is determined that the gust mode of the wind turbine generator will be entered.

[0066] Otherwise, the current operating mode of the wind turbine generator is maintained. The system determines whether to enter gust mode by comparing the wind speed with the gust mode entry threshold. This determination requires the wind speed to be greater than the gust mode entry threshold for a specified duration, thus avoiding frequent mode switching caused by the wind turbine generator reaching the gust mode entry threshold at a single moment.

[0067] S3: When entering gust mode, adjust the minimum pitch angle of the wind turbine generator set to the minimum pitch angle of gust mode operation.

[0068] In some feasible embodiments, adjusting the minimum pitch angle of the wind turbine generator to the minimum pitch angle for gust mode operation includes:

[0069] The minimum pitch angle of the wind turbine in gust mode is determined from the wind speed-pitch angle curve of the wind turbine operation based on real-time wind speed data.

[0070] The minimum pitch angle of the wind turbine generator set is adjusted to match the minimum pitch angle for gust mode. In some feasible embodiments, the minimum pitch angle of the wind turbine generator set is 0° under normal wind conditions. Therefore, after entering gust mode, the minimum pitch angle of the wind turbine generator set needs to be adjusted from 0° to the minimum pitch angle for gust mode. Thus, the minimum pitch angle for gust mode, determined from the wind speed-pitch angle curve of the wind turbine generator set based on real-time wind speed data, can be adjusted in real time according to the current wind speed. This change in the minimum pitch angle ensures that the blade angle of attack margin remains within a safe range.

[0071] After a wind turbine enters gust mode, it will exit gust mode and switch back to normal operation when it reaches a set operating time limit in gust mode or when the gust mode exit condition is met. In some feasible embodiments, the gust mode exit condition includes:

[0072] The real-time wind speed data is below the gust mode exit threshold, and the duration exceeds the second preset time. The set gust mode exit condition includes the second preset time, avoiding frequent mode switching of the wind turbine generator. The set operating time limit can be determined based on statistical data of gust wind conditions in the wind farm where the wind turbine generator is located.

[0073] Based on the above technical means, exit conditions are set for gust mode to avoid excessive blade load and affect the service life of wind turbines when they operate in gust mode for a long time.

[0074] S4: Calculate the generator speed acceleration based on the generator speed data.

[0075] In some feasible embodiments, calculating the generator speed acceleration based on generator speed data includes:

[0076] An asymmetric asynchronous sliding structure is used to filter the generator speed data;

[0077] Calculate generator speed acceleration based on filtered generator speed data.

[0078] In some feasible embodiments, an asymmetric asynchronous sliding structure is used to filter the generator speed data, including:

[0079] During the speed increase process, an asynchronous sliding structure with a first-step length is used to filter the generator speed data. During the speed decrease process, an asynchronous sliding structure with a second-step length is used to filter the generator speed data. The first-step length is smaller than the second-step length. The principle of filtering the generator speed data using the sliding structure is to take the moving average of the generator speed data, which can filter out abrupt changes in generator speed data.

[0080] During the speed increase phase, using a shorter step size to average and filter the generator speed data results in more dramatic and accurate data that closely reflects the actual speed change. Conversely, during the speed decrease phase, using a longer step size to average and filter the generator speed data results in smoother data during the decrease. This allows for a rapid entry and slow exit from the overspeed prevention process, preventing the generator from overspeeding again due to a sudden increase in wind speed during the speed reduction and propeller opening process, which could prevent the propellers from being retracted in time.

[0081] S5: Determine whether to enter the acceleration overspeed prevention control strategy based on generator speed data and generator speed acceleration, specifically including:

[0082] Compare the generator speed data with the overspeed warning speed value;

[0083] If the generator speed is greater than the overspeed warning speed value, the generator speed acceleration is compared with the acceleration overspeed prevention threshold.

[0084] If the generator speed acceleration is greater than the acceleration overspeed prevention threshold, then the acceleration overspeed prevention control strategy will be entered.

[0085] The acceleration overspeed prevention threshold is determined by the speed fluctuation characteristics of the wind turbine generator set operating under gusty wind conditions.

[0086] Based on the above technical means, the generator speed is first compared. If the generator speed is greater than the overspeed warning speed value, the generator speed acceleration is further compared with the acceleration overspeed prevention threshold to determine whether to enter the acceleration overspeed prevention control strategy. The generator speed acceleration reflects the changing trend of the generator speed. When the generator speed acceleration exceeds the threshold, the subsequent speed change will be faster and faster, and the risk of overspeed will be greater. The acceleration overspeed prevention control strategy is entered in advance to achieve early action to protect the wind turbine generator.

[0087] S6: When the acceleration overspeed prevention control strategy is entered, a preset pitch rate is superimposed on the normal pitch rate. Specifically, assuming the normal pitch rate is P, when the acceleration overspeed prevention control strategy is entered, a preset pitch rate C is superimposed on the original pitch rate P. The preset pitch rate C can be determined based on statistical analysis of historical operating data of the wind turbine generator set.

[0088] Based on the above technical means, when entering gust mode, the minimum pitch angle of the wind turbine is adjusted to the minimum pitch angle of gust mode operation, which raises the pitch angle of the wind turbine during operation. This ensures that the blade angle of attack margin can be kept within a safe range when the unit is operating in gust conditions. At the same time, after determining the acceleration overspeed prevention control strategy based on the generator speed acceleration, a preset pitch rate is superimposed on the normal pitch rate to ensure that the pitch can be retracted more quickly in gust conditions and suppress the rise of generator speed.

[0089] This application primarily addresses the overspeeding phenomenon caused by sudden increases in wind speed and delayed pitch response in wind turbines operating under gusty wind conditions. The overspeed prevention control method for wind turbine generators proposed in this application can solve the problem of frequent overspeed shutdowns of wind turbine generators under gusty wind conditions. This method mainly consists of two parts: a gust mode control strategy and an acceleration overspeed prevention control strategy.

[0090] The following is a detailed introduction: Figure 2 A step diagram of the overspeed control method for wind turbine generators resistant to gusts, provided as an example of the present invention, is shown below. Figure 2 As shown, the method includes a gust mode control strategy and an acceleration overspeed prevention control strategy. The gust mode control strategy prevents overspeeding of the wind turbine due to large and drastic fluctuations in wind speed by increasing the minimum pitch angle of the wind turbine. The acceleration overspeed prevention control strategy prevents overspeeding of the turbine due to small and drastic changes in wind speed by additionally superimposing the pitch rate.

[0091] The gust mode control strategy includes:

[0092] like Figure 3 As shown, the wind speed V measured by the anemometer of the wind turbine generator is monitored in real time. If the wind speed V is greater than the gust mode entry threshold V1 for entering the gust control strategy, and the duration exceeds T1, the generator enters the gust mode control strategy. After entering the gust mode control strategy, the generator will increase its minimum pitch angle from 0° to the minimum pitch angle L set in gust mode. The generator will maintain operation at the minimum pitch angle L. If the generator operates under the gust control strategy for a longer period than the set operating time limit T2, or if the wind speed is less than the gust mode exit wind speed threshold V2 and the duration exceeds the set operating time limit T2, the generator will exit the gust control strategy and switch to normal control mode.

[0093] Acceleration overspeed control strategy:

[0094] like Figure 4 As shown, the generator speed N of the wind turbine is monitored in real time. An asymmetric asynchronous sliding structure is used to filter the generator speed data. A short-step R1 asynchronous sliding structure is used during the speed increase, and a long-step R2 asynchronous sliding structure is used during the speed decrease. After filtering by this function, the generator speed changes more drastically during the speed increase phase, which is closer to the actual speed change, and the speed change during the speed decrease phase is smoother. The acceleration value calculated from the filtered generator speed is used to determine the activation and deactivation of the unit's acceleration overspeed prevention control strategy. When the generator speed exceeds the set overspeed warning speed value, if the generator speed acceleration value Q is greater than the acceleration overspeed prevention threshold Q1 for activating the acceleration overspeed prevention control strategy, the unit enters the acceleration overspeed prevention control strategy, and the pitch rate is increased by an additional pitch rate C on top of the original pitch rate, allowing the unit to reduce pitch more quickly. If the generator speed acceleration value Q is less than the acceleration setting threshold Q2 for deactivating the acceleration overspeed prevention control strategy, the unit exits the acceleration overspeed prevention control strategy, and the pitch rate returns to the normal pitch rate.

[0095] The second aspect of this application provides an overspeed prevention control device for wind turbine generator sets designed for gusts of wind, such as... Figure 5 As shown, the device includes:

[0096] The data acquisition unit is used to acquire real-time wind speed data and generator speed data;

[0097] The gust mode determination unit is used to determine whether to enter the gust mode of the wind turbine generator based on real-time wind speed data.

[0098] The minimum pitch angle adjustment unit is used to adjust the minimum pitch angle of the wind turbine generator set to the minimum pitch angle of the gust mode when entering gust mode.

[0099] An acceleration calculation unit is used to calculate the generator speed acceleration based on the generator speed data.

[0100] The acceleration overspeed prevention judgment unit is used to determine whether to enter the acceleration overspeed prevention control strategy based on the generator speed data and the generator speed acceleration.

[0101] The pitch rate adjustment unit is used to superimpose a preset pitch rate on the normal pitch rate when the acceleration overspeed prevention control strategy is determined to be entered.

[0102] Based on the aforementioned technical means, when entering gust mode, the device adjusts the minimum pitch angle of the wind turbine generator set to the minimum pitch angle of gust mode operation, thereby raising the pitch angle of the wind turbine generator set during operation. This ensures that the blade angle of attack margin can be kept within a safe range when the unit is operating in gust conditions. At the same time, after determining the acceleration anti-overspeed control strategy based on the generator speed acceleration, a preset pitch rate is superimposed on the normal pitch rate to ensure that the pitch can be retracted more quickly in gust conditions, suppressing the rise in generator speed.

[0103] A third aspect of this application provides a machine-readable storage medium storing instructions for causing a machine to execute the aforementioned wind turbine overspeed control method for gust-oriented wind turbines.

[0104] Through the above technical solutions, the control strategy adopted in this application, based on the gust mode, can effectively prevent turbine overspeed caused by large and drastic fluctuations in wind speed, while the acceleration-based overspeed prevention control strategy can effectively prevent turbine overspeed caused by small and drastic changes in wind speed. The combination of these two strategies can significantly reduce the number and duration of wind turbine shutdowns due to overspeed failures under severe gust wind conditions, ensuring the safe and stable operation of the wind turbine and reducing the power generation losses due to overspeed failure shutdowns. Furthermore, this application can reduce the frequency of pitch system operation under gust wind conditions, reduce wear and tear on pitch system components, and extend their service life.

[0105] Those skilled in the art will understand that all or part of the steps in the methods of the above embodiments can be implemented by a program instructing related hardware. This program is stored in a storage medium and includes several instructions to cause a microcontroller, chip, or processor to execute all or part of the steps of the methods described in the various embodiments of the present invention. The aforementioned storage medium includes various media capable of storing program code, such as a USB flash drive, a portable hard drive, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk.

[0106] The optional embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the embodiments of the present invention are not limited to the specific details described above. Within the scope of the technical concept of the embodiments of the present invention, various simple modifications can be made to the technical solutions of the embodiments of the present invention, and these simple modifications all fall within the protection scope of the embodiments of the present invention. It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. To avoid unnecessary repetition, the embodiments of the present invention will not further describe the various possible combinations.

[0107] Furthermore, various different embodiments of the present invention can be combined in any way, as long as they do not violate the spirit of the embodiments of the present invention, they should also be regarded as the content disclosed by the embodiments of the present invention.

Claims

1. A method for preventing overspeed in wind turbine generators in the face of gusts, characterized in that, The method includes: Acquire real-time wind speed data and generator speed data; Determine whether to enter the gust mode of the wind turbine generator based on real-time wind speed data; When entering gust mode, adjust the minimum pitch angle of the wind turbine generator to the minimum pitch angle for gust mode operation, including: The minimum pitch angle of the wind turbine in gust mode is determined from the wind speed-pitch angle curve of the wind turbine operation based on real-time wind speed data. Adjust the minimum pitch angle of the wind turbine generator set to the minimum pitch angle of the generator set in gust mode; Calculate the generator speed acceleration based on the generator speed data, including: Asymmetric asynchronous sliding structure is used to filter generator speed data, including: During the speed increase process, an asynchronous sliding structure with a first step length is used to filter the generator speed data, and during the speed decrease process, an asynchronous sliding structure with a second step length is used to filter the generator speed data. The first step length is smaller than the second step length. Calculate generator speed acceleration based on filtered generator speed data; The decision to engage the acceleration overspeed prevention control strategy is based on generator speed data and generator speed acceleration, including: Compare the generator speed data with the overspeed warning speed value; If the generator speed is greater than the overspeed warning speed value, the generator speed acceleration is compared with the acceleration overspeed prevention threshold. If the generator speed acceleration is greater than the acceleration overspeed prevention threshold, then the acceleration overspeed prevention control strategy will be entered. The acceleration overspeed prevention threshold is determined by the speed fluctuation characteristics of the wind turbine generator set under gusty wind conditions. Once the acceleration overspeed prevention control strategy is determined, a preset pitch rate is superimposed on the normal pitch rate. The preset pitch rate is determined based on the statistical analysis of historical operating data of the wind turbine generator set.

2. The overspeed control method for wind turbine generator sets oriented towards gusts according to claim 1, characterized in that, Determining whether to enter the gust mode of the wind turbine generator based on real-time wind speed data includes: Compare real-time wind speed data with the threshold for gust mode entry; If the real-time wind speed data is greater than the threshold for entering gust mode and the duration is greater than the first set time, then it is determined that the gust mode of the wind turbine generator will be entered. Otherwise, ensure that the wind turbine generator remains in its current operating mode.

3. The overspeed control method for wind turbine generator sets oriented towards gusts according to claim 1, characterized in that, The method further includes: When the wind turbine enters gust mode and reaches the set operating time limit, or meets the conditions for exiting gust mode, the wind turbine will be switched back to normal operating mode.

4. The overspeed control method for wind turbine generator sets oriented towards gusts according to claim 3, characterized in that, The conditions for exiting the gust mode include: The real-time wind speed data is less than the wind speed threshold for exiting gust mode and the duration exceeds the second set time.

5. A wind turbine generator set overspeed prevention control device for gust winds, characterized in that, The device includes: The data acquisition unit is used to acquire real-time wind speed data and generator speed data; The gust mode determination unit is used to determine whether to enter the gust mode of the wind turbine generator based on real-time wind speed data. The minimum pitch angle adjustment unit is used to adjust the minimum pitch angle of the wind turbine generator set to the minimum pitch angle for gust mode when entering gust mode, including: The minimum pitch angle of the wind turbine in gust mode is determined from the wind speed-pitch angle curve of the wind turbine operation based on real-time wind speed data. Adjust the minimum pitch angle of the wind turbine generator set to the minimum pitch angle of the generator set in gust mode; An acceleration calculation unit is used to calculate the generator speed acceleration based on the generator speed data, including: Asymmetric asynchronous sliding structure is used to filter generator speed data, including: During the speed increase process, an asynchronous sliding structure with a first step length is used to filter the generator speed data, and during the speed decrease process, an asynchronous sliding structure with a second step length is used to filter the generator speed data. The first step length is smaller than the second step length. Calculate generator speed acceleration based on filtered generator speed data; The acceleration overspeed prevention judgment unit is used to determine whether to enter the acceleration overspeed prevention control strategy based on generator speed data and generator speed acceleration, including: Compare the generator speed data with the overspeed warning speed value; If the generator speed is greater than the overspeed warning speed value, the generator speed acceleration is compared with the acceleration overspeed prevention threshold. If the generator speed acceleration is greater than the acceleration overspeed prevention threshold, then the acceleration overspeed prevention control strategy will be entered. The acceleration overspeed prevention threshold is determined by the speed fluctuation characteristics of the wind turbine generator set under gusty wind conditions. The pitch rate adjustment unit is used to superimpose a preset pitch rate on the normal pitch rate when the acceleration overspeed prevention control strategy is determined. The preset pitch rate is determined based on the statistical analysis of historical operating data of the wind turbine generator set.

6. A machine-readable storage medium storing instructions thereon, characterized in that, This instruction is used to cause the machine to perform the wind turbine generator overspeed control method for gusts as described in any one of claims 1-4.

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