Gust-oriented wind generating set anti-overspeed control method and device and medium

Abstract

The invention provides a gust-oriented wind generating set anti-overspeed control method and device and a medium, and belongs to the field of wind generating set control. The method comprises the following steps: acquiring real-time wind speed data and generator speed data; determining whether to enter a gust mode of the wind generating set according to the real-time wind speed data; under the condition that the wind generating set enters the gust mode, the minimum pitch angle of operation of the wind generating set is adjusted to be the minimum pitch angle of operation of the gust mode; calculating generator speed acceleration according to the generator speed data; determining whether to enter an acceleration anti-overspeed control strategy according to the generator rotating speed data and the generator rotating speed acceleration; and under the condition that it is determined that the acceleration anti-overspeed control strategy is entered, the preset variable-pitch rate is superposed on the normal variable-pitch rate. The pitch angle of the wind generating set in operation is increased when the wind generating set enters the gust mode, so that the attack angle margin of the blade can be kept in a safe range, and after the acceleration overspeed prevention control strategy is entered, the preset variable pitch rate is superposed on the normal variable pitch rate.

Description

Technical Field

[0001] The present invention relates to the technical field of wind turbine generator set control, and in particular to a gust-oriented wind turbine generator set overspeed prevention control method, a gust-oriented wind turbine generator set overspeed prevention control device and a machine-readable storage medium. Background Art

[0002] Wind turbines use wind energy to drive the rotors to rotate and convert wind energy into electrical energy. The characteristics of wind are important factors affecting the stable operation of wind turbines. Wind changes are random and sudden, and strong gusts are characterized by drastic changes in wind speed in a short period of time. Wind turbines operating under strong gust conditions are susceptible to large wind shear shocks, increasing the risk of unit operation.

[0003] After the wind turbine reaches the rated speed, the control system maintains the stability of the speed of the unit by controlling the pitch. When the wind turbine is operating under extreme conditions of strong gusts, the wind speed decreases and then rises rapidly. Due to the limited response capability of the pitch actuator of the unit, the retracted pitch position cannot meet the requirements, causing the unit speed to rise rapidly, exceeding the speed protection limit of the control system, and causing the speed overspeed shutdown fault. Under strong gusts, wind turbines are prone to frequent overspeed shutdowns, resulting in power generation losses.

[0004] At present, when facing gusty wind conditions, the control system of wind turbines uses a control method that triggers the overspeed protection action only when the speed exceeds the speed protection threshold, which has obvious lag. When the wind turbine performs the anti-overspeed action, the unit is already in an overspeed state. This control method is not only difficult to suppress the increase in speed in time, but also frequently opens the propeller, which will affect the life of the variable pitch system components. Therefore, how to effectively reduce the frequent overspeed phenomenon of wind turbines under gusty wind conditions is an urgent problem to be solved. Summary of the invention The purpose of the embodiments of the present invention is to provide a gust-oriented wind turbine anti-overspeed control method, device and medium. The method adjusts the minimum operating pitch angle of the wind turbine to the minimum operating pitch angle of the gust mode when entering the gust mode, thereby raising the pitch angle of the wind turbine during operation, so that when the unit operates under gusty wind conditions, the angle of attack margin of the blades can be maintained within a safe range. At the same time, after determining to enter 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 blades can be retracted more quickly under gusty wind conditions and to suppress the increase in generator speed. The two strategies work together to effectively prevent the wind turbine from overspeeding due to frequent distance fluctuations in wind speed and untimely pitch response under gusty conditions where the wind speed changes dramatically.

[0005] In order to achieve the above object, the first aspect of the present invention provides a gust-oriented wind turbine generator set overspeed prevention control method, the method comprising: Obtain real-time wind speed data and generator speed data; Determine whether to enter the gust mode of the wind turbine generator set according to the real-time wind speed data; When entering the gust mode, the minimum pitch angle of the wind turbine generator set is adjusted to the minimum pitch angle of the gust mode; Calculate the generator speed acceleration according to the generator speed data; Determine whether to enter the acceleration overspeed prevention control strategy according to the generator speed data and the generator speed acceleration; When it is determined to enter the acceleration overspeed prevention control strategy, the preset pitch rate is superimposed on the normal pitch rate.

[0006] According to the above technical means, when entering the gust mode, the minimum operating pitch angle of the wind turbine is adjusted to the minimum operating pitch angle of the gust mode, which raises the pitch angle of the wind turbine during operation, so that when the unit operates under gust wind conditions, the angle of attack margin of the blades can be maintained within a safe range. At the same time, after determining to enter the acceleration overspeed prevention control strategy based on the generator speed acceleration, the preset pitch rate is superimposed on the normal pitch rate to ensure that the blades can be retracted more quickly under gust wind conditions and suppress the increase in generator speed.

[0007] In some feasible embodiments, determining whether to enter the gust mode of the wind turbine generator set according to the real-time wind speed data includes: Comparing real-time wind speed data to gust mode entry thresholds; If the real-time wind speed data is greater than the gust mode entry threshold and the duration is greater than the first set time, it is determined to enter the gust mode of the wind turbine generator set; Otherwise, it is determined to maintain the current operation mode of the wind turbine generator set.

[0008] According to the above technical means, the wind speed is compared with the gust mode entry threshold to determine whether to enter the gust mode. At the same time, the wind speed is required to be greater than the gust mode entry threshold and last for a first set time when making the judgment. This avoids frequent switching of wind turbine modes caused by the wind speed reaching the gust mode entry threshold at a single moment.

[0009] In some feasible embodiments, adjusting the minimum pitch angle of the wind turbine generator set to the minimum pitch angle of the gust mode includes: The minimum pitch angle for the wind turbine in gust mode is determined from the wind speed-pitch angle curve of the wind turbine according to the real-time wind speed data; The minimum operating pitch angle of the wind turbine generator set is adjusted to the minimum operating pitch angle of the wind turbine generator set in gust mode.

[0010] According to the above technical means, the minimum pitch angle of the gust mode unit operation is determined from the wind speed-pitch angle curve of the wind turbine unit according to the real-time wind speed data. The minimum pitch angle of the gust mode unit operation can be adjusted in real time according to the current wind speed. The change of the minimum pitch angle can keep the angle of attack margin of the blades within a safe range.

[0011] In some possible embodiments, the method further comprises: When the wind turbine generator set enters the gust mode and reaches the set operation limit, or meets the gust mode exit condition, the wind turbine generator set is switched to the normal operation mode.

[0012] According to the above technical means, an exit condition is set for the gust mode, which prevents the wind turbine from working in the gust mode for a long time, causing excessive blade load and affecting the service life of the wind turbine.

[0013] In some feasible embodiments, the gust mode exit condition includes: The real-time wind speed data is less than the gust mode exit wind speed threshold and lasts for more than a second set time.

[0014] According to the above technical means, the set gust mode exit condition includes the second set time, thereby avoiding frequent switching of the wind turbine generator set mode.

[0015] In some feasible embodiments, calculating the generator speed acceleration according to the generator speed data includes: An asymmetric asynchronous sliding structure is used to filter the generator speed data; The generator speed acceleration is calculated based on the filtered generator speed data.

[0016] In some feasible embodiments, an asymmetric asynchronous sliding structure is used to filter the generator speed data, including: During the speed increase process, the generator speed data is filtered using the asynchronous sliding structure of the first step length, and during the speed decrease process, the generator speed data is filtered using the asynchronous sliding structure of the second step length, and the first step length is smaller than the second step length.

[0017] According to the above technical means, after the generator speed data is processed by asynchronous sliding structure filtering, the change in the speed rising stage is more drastic and closer to the actual speed change, and the change in the speed decreasing process is smoother, so that the unit can quickly enter the anti-overspeed process and slowly exit, so as to prevent the speed from exceeding the speed again because the unit encounters a sudden increase in wind speed during the anti-overspeed exit and the speed is reduced during the propeller opening process, and there is no time to retract the propellers.

[0018] In some feasible embodiments, determining whether to enter the acceleration overspeed prevention control strategy according to the generator speed data and the generator speed acceleration includes: 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, it is determined to enter the acceleration overspeed prevention control strategy; The acceleration overspeed prevention threshold is determined by the rotation speed fluctuation characteristics of the wind turbine generator set operating under gusty wind conditions.

[0019] According to the above technical means, the generator speed is first compared. When 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 changes will become faster and faster. The greater the overspeed risk, the earlier the acceleration overspeed prevention control strategy is entered, and early action is taken to protect the wind turbine.

[0020] A second aspect of the present application provides a gust-oriented wind turbine generator set overspeed prevention control device, the device comprising: A data acquisition unit, used to acquire real-time wind speed data and generator speed data; A gust mode determination unit, used to determine whether to enter the gust mode of the wind turbine generator set according to 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 of the gust mode when the wind turbine generator set enters the gust mode; An acceleration calculation unit, used for calculating the generator speed acceleration according to the generator speed data; An acceleration overspeed prevention judgment unit is used to determine whether to enter an acceleration overspeed prevention control strategy according to the generator speed data and the generator speed acceleration; The pitch rate adjustment unit is used to superimpose a preset pitch rate on a normal pitch rate when it is determined that the acceleration overspeed prevention control strategy is entered.

[0021] According to the above technical means, the device adjusts the minimum operating pitch angle of the wind turbine to the minimum operating pitch angle of the gust mode when entering the gust mode, thereby raising the pitch angle of the wind turbine during operation, so that when the unit operates under gust wind conditions, the angle of attack margin of the blades can be maintained within a safe range. At the same time, after determining to enter the acceleration overspeed prevention control strategy based on the generator speed acceleration, the preset pitch rate is superimposed on the normal pitch rate to ensure that the pitches can be retracted more quickly under gust wind conditions, thereby suppressing the increase in generator speed.

[0022] A third aspect of the present application provides a machine-readable storage medium having instructions stored thereon, the instructions being used to enable a machine to execute the gust-oriented wind turbine generator set overspeed prevention control method.

[0023] Through the above technical solutions, among the control strategies adopted in this application, the control strategy based on the gust mode can effectively prevent the unit speed overspeed phenomenon caused by large and drastic fluctuations in wind speed, and the acceleration overspeed prevention control strategy can effectively prevent the unit overspeed phenomenon caused by small and drastic changes in wind speed. The combination of the two strategies can greatly reduce the number and duration of wind turbine shutdowns caused by unit overspeed failures under severe gusty wind conditions, ensure the safe and stable operation of wind turbines, and reduce the loss of power generation benefits due to shutdowns due to overspeed failures. On the other hand, the present application can reduce the action frequency of the variable pitch system under gusty wind conditions, reduce the loss of variable pitch system components, and extend the service life.

[0024] Other features and advantages of the embodiments of the present invention will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The accompanying drawings are used to provide a further understanding of the embodiments of the present invention and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the embodiments of the present invention, but do not constitute a limitation on the embodiments of the present invention. In the accompanying drawings: Figure 1 It is a flow chart of a gust-oriented wind turbine generator set overspeed prevention control method provided by an embodiment of the present invention; Figure 2 It is a step diagram of a gust-oriented wind turbine generator set overspeed prevention control method provided by an embodiment of the present invention; Figure 3 is a flow chart of a gust mode control strategy provided by an embodiment of the present invention; Figure 4 It is a flow chart of an acceleration overspeed prevention control strategy provided by an embodiment of the present invention; Figure 5 The present invention is a block diagram of a gust-oriented wind turbine generator set overspeed prevention control device provided in one embodiment of the present invention. DETAILED DESCRIPTION

[0026] The specific implementation of the present invention is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described here is only used to illustrate and explain the present invention, and is not used to limit the present invention.

[0027] The present application provides a gust-oriented wind turbine overspeed prevention control method, which can be deployed in a main controller of the wind turbine, or a separate controller can be deployed to perform overspeed prevention control on the wind turbine.

[0028] Figure 1 FIG. 1 is a flow chart of a method for preventing overspeed of a wind turbine generator set from gusting winds provided by an embodiment of the present invention. Figure 1 As shown, an embodiment of the present invention provides a gust-oriented wind turbine generator set overspeed prevention control method, the method comprising: 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 collection device installed at a corresponding position of the generator and transmitted to the wind turbine main controller.

[0029] S2: Determine whether to enter the gust mode of the wind turbine generator set according to the real-time wind speed data.

[0030] In some feasible embodiments, determining whether to enter the gust mode of the wind turbine generator set according to the real-time wind speed data includes: The real-time wind speed data is compared with a gust mode entry threshold, wherein the gust mode entry threshold is set according to the working condition of the wind turbine under gusty wind conditions to prevent the wind turbine from overspeeding.

[0031] If the real-time wind speed data is greater than the gust mode entry threshold and the duration is greater than the first set time, it is determined to enter the gust mode of the wind turbine generator set; Otherwise, it is determined to maintain the current operating mode of the wind turbine generator set. By comparing the wind speed with the gust mode entry threshold, it is determined whether to enter the gust mode. At the same time, the determination requires that the wind speed is greater than the gust mode entry threshold and lasts for a first set time, thereby avoiding frequent switching of the wind turbine generator set mode caused by the situation that the wind speed reaches the gust mode entry threshold at a single moment.

[0032] S3: When entering the gust mode, the minimum pitch angle of the wind turbine generator set is adjusted to the minimum pitch angle of the gust mode.

[0033] In some feasible embodiments, adjusting the minimum pitch angle of the wind turbine generator set to the minimum pitch angle of the gust mode includes: The minimum pitch angle for the wind turbine in gust mode is determined from the wind speed-pitch angle curve of the wind turbine according to the real-time wind speed data; The minimum pitch angle of the wind turbine generator set is adjusted to the minimum pitch angle of the gust mode set. In some feasible embodiments, under normal wind conditions, the minimum pitch angle of the wind turbine generator set is 0°. Therefore, after entering the gust mode, the minimum pitch angle of the wind turbine generator set needs to be adjusted from 0° to the minimum pitch angle of the gust mode set. Therefore, the minimum pitch angle of the gust mode set determined from the wind speed-pitch angle curve of the wind turbine set according to real-time wind speed data can be adjusted in real time according to the current wind speed to the minimum pitch angle of the gust mode set. The change of the minimum pitch angle can keep the angle of attack margin of the blades within a safe range.

[0034] After the wind turbine generator set enters the gust mode, it will exit the gust mode and switch the wind turbine generator set to the normal operation mode when the gust mode operation reaches the set operation limit or the gust mode exit condition is met. In some feasible embodiments, the gust mode exit condition includes: The real-time wind speed data is less than the gust mode exit wind speed threshold and the duration exceeds the second set time. The set gust mode exit condition includes the second set time, which avoids frequent switching of wind turbine modes. The set operation limit can be determined based on the statistical data of the gust wind conditions in the wind farm where the wind turbine is located.

[0035] According to the above technical means, an exit condition is set for the gust mode, which prevents the wind turbine from working in the gust mode for a long time, causing excessive blade load and affecting the service life of the wind turbine.

[0036] S4: Calculate the generator speed acceleration according to the generator speed data.

[0037] In some feasible embodiments, calculating the generator speed acceleration according to the generator speed data includes: An asymmetric asynchronous sliding structure is used to filter the generator speed data; The generator speed acceleration is calculated based on the filtered generator speed data.

[0038] In some feasible embodiments, an asymmetric asynchronous sliding structure is used to filter the generator speed data, including: During the speed increase process, the asynchronous sliding structure of the first step length is used to filter the generator speed data. During the speed decrease process, the asynchronous sliding structure of the 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 the sliding structure filtering the generator speed data is to take the sliding mean of the generator speed data, so that the sudden change of the motor speed data can be filtered out.

[0039] During the speed increase process, a shorter step length is used to average and filter the generator speed data, which can make the generator speed data after filtering in the rising stage more drastic and closer to the actual speed change; during the speed decrease process, a longer step length is used to average and filter the generator speed data, which can make the generator speed data in the decreasing stage smoother. The unit can quickly enter the anti-overspeed process and slowly exit it to prevent the unit from overspeeding again because of a sudden increase in wind speed during the speed reduction and propeller opening process when the unit exits the anti-overspeed process and fails to retract the propellers in time.

[0040] S5: Determine whether to enter the acceleration overspeed prevention control strategy based on the generator speed data and the 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, it is determined to enter the acceleration overspeed prevention control strategy; The acceleration overspeed prevention threshold is determined by the rotation speed fluctuation characteristics of the wind turbine generator set operating under gusty wind conditions.

[0041] According to the above technical means, the generator speed is first compared. When 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 changes will become faster and faster. The greater the overspeed risk, the earlier the acceleration overspeed prevention control strategy is entered, and early action is taken to protect the wind turbine.

[0042] S6: When it is determined to enter the acceleration overspeed prevention control strategy, a preset pitch rate is superimposed on the normal pitch rate. Specifically, assuming that 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 the historical operation data of the wind turbine generator set.

[0043] According to the above technical means, when entering the gust mode, the minimum operating pitch angle of the wind turbine is adjusted to the minimum operating pitch angle of the gust mode, which raises the pitch angle of the wind turbine during operation, so that when the unit operates under gust wind conditions, the angle of attack margin of the blades can be maintained within a safe range. At the same time, after determining to enter the acceleration overspeed prevention control strategy based on the generator speed acceleration, the preset pitch rate is superimposed on the normal pitch rate to ensure that the blades can be retracted more quickly under gust wind conditions and suppress the increase in generator speed.

[0044] This application is mainly aimed at the overspeed phenomenon of the generator speed being too fast due to the sudden increase in wind speed and the untimely response of pitch change under the gusty working conditions of the wind turbine with drastic changes in wind speed. The gust-oriented wind turbine generator set anti-overspeed control method of this application can solve the problem of frequent overspeed shutdown of wind turbine generator sets under gusty conditions. The method mainly includes two parts, namely the gust mode control strategy and the acceleration overspeed prevention control strategy.

[0045] The following is a detailed description of them: Figure 2 The steps of the wind turbine generator set overspeed prevention control method for gusts provided by the present invention are as follows: 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 the overspeed phenomenon of the unit speed caused by large and drastic fluctuations in wind speed by increasing the minimum pitch angle of the wind turbine generator set; the acceleration overspeed prevention control strategy prevents the overspeed phenomenon of the unit caused by small and drastic changes in wind speed by additionally superimposing the pitch rate.

[0046] Among them, the gust mode control strategy includes: like Figure 3 As shown, the wind speed V measured by the anemometer of the wind turbine generator set 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 unit enters the gust mode control strategy. After entering the gust mode control strategy, the unit will increase the minimum operating pitch angle from 0° to the minimum unit operating pitch angle L set in the gust mode. The unit maintains operation at the minimum pitch angle L. When the unit operates under the gust control strategy for more than the set operating limit T2 or the wind speed is less than the gust mode exit wind speed threshold V2 and the duration exceeds the set operating limit T2, the unit exits the gust control strategy and switches to the normal control mode.

[0047] Acceleration overspeed prevention control strategy: like Figure 4As shown, the generator speed N of the wind turbine generator set is monitored in real time, and the generator speed data is filtered using an asymmetric asynchronous sliding structure. The short step length R1 asynchronous sliding structure is used during the speed increase process, and the long step length R2 asynchronous sliding structure is used during the speed decrease process. After the generator speed is filtered by this function, the change in the speed increase stage is more drastic and closer to the actual speed change, and the speed change in the speed decrease process is smoother. The acceleration value is calculated from the generator speed obtained after filtering, which is used to turn on and off the acceleration overspeed control strategy of the unit. When the generator speed exceeds the set overspeed warning speed value, if the generator speed acceleration value Q is greater than the acceleration overspeed threshold Q1 of the acceleration overspeed control strategy, the unit enters the acceleration overspeed control strategy, and the pitch rate is superimposed on the original additional pitch rate C, so that the unit can retract the pitch more quickly. If the generator speed acceleration value Q is less than the acceleration setting threshold Q2 of the acceleration overspeed control strategy, the unit exits the acceleration overspeed control strategy, and the pitch rate is restored to the normal pitch rate.

[0048] The second aspect of the present application provides a gust-oriented wind turbine generator set overspeed prevention control device, such as Figure 5 As shown, the device comprises: A data acquisition unit, used to acquire real-time wind speed data and generator speed data; A gust mode determination unit, used to determine whether to enter the gust mode of the wind turbine generator set according to 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 of the gust mode when the wind turbine generator set enters the gust mode; An acceleration calculation unit, used for calculating the generator speed acceleration according to the generator speed data; An acceleration overspeed prevention judgment unit is used to determine whether to enter an acceleration overspeed prevention control strategy according to the generator speed data and the generator speed acceleration; The pitch rate adjustment unit is used to superimpose a preset pitch rate on a normal pitch rate when it is determined that the acceleration overspeed prevention control strategy is entered.

[0049] According to the above technical means, the device adjusts the minimum operating pitch angle of the wind turbine to the minimum operating pitch angle of the gust mode when entering the gust mode, thereby raising the pitch angle of the wind turbine during operation, so that when the unit operates under gust wind conditions, the angle of attack margin of the blades can be maintained within a safe range. At the same time, after determining to enter the acceleration overspeed prevention control strategy based on the generator speed acceleration, the preset pitch rate is superimposed on the normal pitch rate to ensure that the pitches can be retracted more quickly under gust wind conditions, thereby suppressing the increase in generator speed.

[0050] A third aspect of the present application provides a machine-readable storage medium having instructions stored thereon, the instructions being used to enable a machine to execute the gust-oriented wind turbine generator set overspeed prevention control method.

[0051] Through the above technical solutions, among the control strategies adopted in this application, the control strategy based on the gust mode can effectively prevent the unit speed overspeed phenomenon caused by large and drastic fluctuations in wind speed, and the acceleration overspeed prevention control strategy can effectively prevent the unit overspeed phenomenon caused by small and drastic changes in wind speed. The combination of the two strategies can greatly reduce the number and duration of wind turbine shutdowns caused by unit overspeed failures under severe gusty wind conditions, ensure the safe and stable operation of wind turbines, and reduce the loss of power generation benefits due to shutdowns due to overspeed failures. On the other hand, the present application can reduce the action frequency of the variable pitch system under gusty wind conditions, reduce the loss of variable pitch system components, and extend the service life.

[0052] Those skilled in the art will understand that all or part of the steps in the method for implementing the above-mentioned embodiments can be completed by instructing the relevant hardware through a program, and the program is stored in a storage medium, including several instructions for making a single-chip microcomputer, a chip or a processor execute all or part of the steps of the method described in each embodiment of the present invention. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), disk or optical disk and other media that can store program codes.

[0053] The optional embodiments of the present invention are described in detail above in conjunction with the accompanying drawings. However, the embodiments of the present invention are not limited to the specific details in the above embodiments. Within the technical concept of the embodiments of the present invention, the technical scheme of the embodiments of the present invention can be subjected to a variety of simple modifications, and these simple modifications all belong to 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. In order to avoid unnecessary repetition, the embodiments of the present invention will not further describe various possible combinations.

[0054] In addition, various embodiments of the present invention may be arbitrarily combined, and as long as they do not violate the concept of the embodiments of the present invention, they should also be regarded as the contents disclosed in the embodiments of the present invention.

Claims

1. A gust-oriented wind turbine generator set overspeed prevention control method, characterized in that: The method comprises: Obtain real-time wind speed data and generator speed data; Determine whether to enter the gust mode of the wind turbine generator set according to the real-time wind speed data; When entering the gust mode, the minimum pitch angle of the wind turbine generator set is adjusted to the minimum pitch angle of the gust mode; Calculate the generator speed acceleration according to the generator speed data; Determine whether to enter the acceleration overspeed prevention control strategy according to the generator speed data and the generator speed acceleration; When it is determined to enter the acceleration overspeed prevention control strategy, the preset pitch rate is superimposed on the normal pitch rate.

2. The gust-oriented wind turbine generator set overspeed prevention control method according to claim 1, characterized in that: Determine whether to enter the gust mode of the wind turbine generator set based on real-time wind speed data, including: Comparing real-time wind speed data to gust mode entry thresholds; If the real-time wind speed data is greater than the gust mode entry threshold and the duration is greater than the first set time, it is determined to enter the gust mode of the wind turbine generator set; Otherwise, it is determined to maintain the current operation mode of the wind turbine generator set.

3. The gust-oriented wind turbine generator set overspeed prevention control method according to claim 1, characterized in that: Adjust the minimum pitch angle of the wind turbine generator set to the minimum pitch angle of the gust mode, including: The minimum pitch angle for the wind turbine in gust mode is determined from the wind speed-pitch angle curve of the wind turbine according to the real-time wind speed data; The minimum pitch angle of the wind turbine generator set is adjusted to the minimum pitch angle of the wind turbine generator set in gust mode.

4. The gust-oriented wind turbine generator set overspeed prevention control method according to claim 1, characterized in that: The method further comprises: When the wind turbine generator set enters the gust mode and reaches the set operation limit, or meets the gust mode exit condition, the wind turbine generator set is switched to the normal operation mode.

5. The gust-oriented wind turbine generator set overspeed prevention control method according to claim 4, characterized in that: The gust mode exit conditions include: The real-time wind speed data is less than the gust mode exit wind speed threshold and lasts for more than a second set time.

6. The gust-oriented wind turbine generator set overspeed prevention control method according to claim 1, characterized in that: Calculate the generator speed acceleration based on the generator speed data, including: An asymmetric asynchronous sliding structure is used to filter the generator speed data; The generator speed acceleration is calculated based on the filtered generator speed data.

7. The gust-oriented wind turbine generator set overspeed prevention control method according to claim 6, characterized in that: The generator speed data is filtered using an asymmetric asynchronous sliding structure, including: During the speed increase process, the generator speed data is filtered using the asynchronous sliding structure of the first step length, and during the speed decrease process, the generator speed data is filtered using the asynchronous sliding structure of the second step length, and the first step length is smaller than the second step length.

8. The gust-oriented wind turbine generator set overspeed prevention control method according to claim 1, characterized in that: Determine whether to enter the acceleration overspeed prevention control strategy based on the generator speed data and the 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, it is determined to enter the acceleration overspeed prevention control strategy; The acceleration overspeed prevention threshold is determined by the rotation speed fluctuation characteristics of the wind turbine generator set operating under gusty wind conditions.

9. An anti-overspeed control device for a wind turbine generator set facing gusts, characterized in that: The device comprises: A data acquisition unit, used to acquire real-time wind speed data and generator speed data; A gust mode determination unit, used to determine whether to enter the gust mode of the wind turbine generator set according to 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 of the gust mode when the wind turbine generator set enters the gust mode; An acceleration calculation unit, used for calculating the generator speed acceleration according to the generator speed data; An acceleration overspeed prevention judgment unit is used to determine whether to enter an acceleration overspeed prevention control strategy according to the generator speed data and the generator speed acceleration; The pitch rate adjustment unit is used to superimpose a preset pitch rate on a normal pitch rate when it is determined that the acceleration overspeed prevention control strategy is entered.

10. A machine-readable storage medium having instructions stored thereon, characterized in that: The instruction is used to enable the machine to execute the gust-facing wind turbine generator set overspeed prevention control method described in any one of claims 1-8.

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