Anti-overspeed control method and device for extreme gust of wind turbine generator

Abstract

The invention discloses a wind turbine generator extreme gust anti-overspeed control method and device, and the method comprises the following steps: obtaining the wind wheel rotation speed data of a wind turbine generator, and judging whether the operation condition of the wind turbine generator is an extreme gust condition or not based on the wind wheel rotation speed data; when the operation working condition is the extreme gust working condition, generator rotating speed data, a pitch angle actual value and a given variable pitch rate of the wind turbine generator set are obtained; through a PD control strategy, the superposition variable pitch rate is calculated by combining the rotating speed data of the generator; and based on the sum of the superimposed variable pitch rate and the given variable pitch rate, a pitch angle adjustment value is calculated, and blades of the wind turbine generator are controlled to be subjected to advanced variable pitch according to the pitch angle value. Gust variable-pitch control is introduced on the basis of traditional variable-pitch control, when gust is detected, the gust variable-pitch control can be rapidly collected, thrust and torque borne by a unit are reduced, overspeed is prevented, the load of the unit is reduced, and technical cost reduction of the wind turbine unit is facilitated.

Description

Technical Field

[0001] The present invention relates to the technical field of wind turbine pitch control, and in particular to a method and device for preventing overspeed control of a wind turbine in extreme gusts. Background Art

[0002] With the increasingly serious phenomenon of "wind curtailment and power restriction" in my country, the focus of wind power development has shifted from the three northern regions to the southeast of the central and eastern regions, and wind power generation in this region is mainly distributed. However, in my country's existing wind power generation system, there are not many high-quality wind resources, most of which are located in areas with complex terrain such as mountains. In addition, due to the constraints of natural conditions such as undulating terrain, the operating conditions of wind power generation systems are relatively complex, especially in extreme convective weather and thunderstorm weather conditions, wind turbines will encounter gusts or even extreme gusts.

[0003] In wind turbines, the blades of wind turbines are affected by wind and show obvious nonlinear characteristics and hysteresis characteristics. When gusts pass through, the unit is prone to overload, especially in extreme gusts. Each extreme gust will pose a great threat to the wind turbine. In wind turbines, traditional variable pitch control uses PI control, which can eliminate steady-state errors and improve control accuracy. However, for components with large inertia such as wind turbines, their changes always lag behind the changes in errors. When an instantaneous response such as an extreme gust occurs, the system output has a large deviation in a short period of time, which will cause the accumulation of integrals, thereby causing a large overshoot of the system and causing the wind turbine to shut down due to overspeed; moreover, as the impeller and capacity of the wind turbine continue to increase, the inertia of the wind wheel will also continue to increase, resulting in the operating state of the wind wheel being difficult to change, so that the frequency of overspeed problems when the wind turbine responds to extreme gusts is greater.

[0004] Currently, laser wind radars are installed to identify extreme gusts in advance, and the pitch system is activated in advance through feedforward control, thereby improving the overspeed and overload problems of wind turbines. However, the reliability of laser wind radars is greatly reduced in foggy or rainy and snowy weather conditions; at the same time, due to cost considerations, it is difficult to apply the newly added external detection equipment in batches. Summary of the invention

[0005] The purpose of the embodiments of the present invention is to provide a method and device for preventing overspeed control of a wind turbine set in extreme gusts. By introducing gust pitch control on the basis of traditional pitch control, the pitches can be quickly retracted when gusts are detected, thereby reducing the thrust and torque on the unit, preventing overspeed and reducing the load on the unit, which is helpful to reduce the technical cost of the wind turbine set.

[0006] In order to solve the above technical problems, a first aspect of an embodiment of the present invention provides a method for preventing overspeed in extreme gusts of wind turbines, comprising the following steps:

[0007] Obtaining rotor speed data of a wind turbine generator set, and determining whether an operating condition of the wind turbine generator set is an extreme gust condition based on the rotor speed data;

[0008] When the operating condition is an extreme gust condition, obtaining the generator speed data, the actual value of the pitch angle and the given pitch rate of the wind turbine generator set;

[0009] By using the PD control strategy, the superimposed pitch rate is calculated in combination with the generator speed data;

[0010] Based on the sum of the superimposed pitch rate and the given pitch rate, a pitch angle adjustment value is calculated, and the wind turbine blades are controlled to perform early pitch change according to the pitch angle adjustment value.

[0011] Further, judging whether the operating condition of the wind turbine generator set is an extreme gust condition based on the wind rotor speed data includes:

[0012] Obtaining a wind rotor speed and a wind rotor speed acceleration of the wind turbine generator set;

[0013] When both the wind rotor speed and the wind rotor speed acceleration exceed corresponding thresholds, it is determined that the wind turbine generator set is in an extreme gust operating condition.

[0014] Furthermore, after obtaining the acceleration of the wind turbine rotor speed, the method further includes:

[0015] The wind wheel speed acceleration is subjected to mean filtering.

[0016] Furthermore, the PD control strategy is used to calculate the superimposed pitch rate in combination with the generator speed data, including:

[0017] Calculating the speed change rate of the generator based on the generator speed data;

[0018] Based on the PD control strategy, calculating the differential increment of the speed change rate;

[0019] Calculating an output increment of the PD control based on the differential increment of the speed change rate;

[0020] Based on the output increment, combined with the proportional control increment, a superimposed pitch rate is obtained.

[0021] Furthermore, after calculating the output increment of the PD control, the method further includes:

[0022] performing a limiting process on the output increment;

[0023] The calculation formula for the limiting processing is:

[0024]

[0025] Among them, x is the output increment, L is the upper limit of the output increment, and -L is the lower limit of the output increment.

[0026] Further, the calculating the speed change rate of the generator based on the generator speed data includes:

[0027] Obtain the generator speed values ​​of two adjacent detection cycles;

[0028] The speed change rate of the generator is calculated based on two generator speed values ​​and a time interval between two adjacent detection cycles.

[0029] Further, the calculating the differential increment of the rotational speed change rate includes:

[0030] Obtaining two adjacent speed change rates of the generator;

[0031] Based on two adjacent rotational speed change rates and a time interval between two adjacent detection cycles, a differential increment of the rotational speed change rate is calculated.

[0032] Accordingly, a second aspect of an embodiment of the present invention provides a wind turbine extreme gust overspeed prevention control device, comprising:

[0033] A working condition judgment module, which is used to obtain the rotor speed data of the wind turbine set, and judge whether the operating condition of the wind turbine set is an extreme gust condition based on the rotor speed data;

[0034] A data acquisition module, which is used to acquire the generator speed data, the actual value of the pitch angle and the given pitch rate of the wind turbine when the operating condition is an extreme gust condition;

[0035] A pitch calculation module, which is used to calculate the superimposed pitch rate by combining the generator speed data through the PD control strategy;

[0036] The pitch adjustment module is used to calculate a pitch angle adjustment value based on the sum of the superimposed pitch rate and the given pitch rate, and control the wind turbine blades to perform early pitch change according to the pitch angle adjustment value.

[0037] Correspondingly, a third aspect of an embodiment of the present invention provides an electronic device, comprising: at least one processor; and a memory connected to the at least one processor; wherein the memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor so that the at least one processor executes the above-mentioned wind turbine extreme gust anti-overspeed control method.

[0038] Accordingly, a fourth aspect of an embodiment of the present invention provides a computer-readable storage medium having computer instructions stored thereon, which, when executed by a processor, implement the above-mentioned method for preventing overspeed control of extreme gusts of wind turbines.

[0039] The above technical solution of the embodiment of the present invention has the following beneficial technical effects:

[0040] 1. The PD control strategy is used in combination with the generator speed data to calculate the superimposed pitch rate. This calculation method based on control theory can reasonably determine the additional superimposed pitch rate according to the real-time generator speed of the unit, thereby more accurately guiding the pitch angle adjustment to adapt to the complex changes under extreme gust conditions;

[0041] 2. The pitch angle adjustment value is calculated based on the sum of the superimposed pitch rate and the given pitch rate, and the wind turbine blades are controlled to change pitch in advance according to the pitch angle adjustment value. Through such a systematic calculation and control process, the pitch angle of the wind turbine can be accurately and timely adjusted under extreme gust conditions, effectively preventing the wind turbine from overspeeding due to extreme gusts, and ensuring the safe and stable operation of the wind turbine under extreme conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 is a flow chart of a method for preventing overspeed in extreme gusts of wind turbines provided by an embodiment of the present invention;

[0043] Figure 2a is a comparison diagram of the generator speed between the conventional control strategy and the gust control strategy of the present invention;

[0044] Figure 2b is a comparison diagram of the front and rear vibrations of the cabin between the conventional control strategy and the gust control strategy of the present invention;

[0045] Figure 2c is a blade root load comparison diagram between the conventional control strategy and the gust control strategy of the present invention;

[0046] Figure 3 It is a module block diagram of an extreme gust overspeed prevention control device for a wind turbine set provided by an embodiment of the present invention.

[0047] Reference numerals:

[0048] 1. Working condition judgment module, 2. Data acquisition module, 3. Pitch calculation module, 4. Pitch adjustment module. DETAILED DESCRIPTION

[0049] In order to make the purpose, technical scheme and advantages of the present invention clearer, the present invention is further described in detail below in conjunction with specific embodiments and with reference to the accompanying drawings. It should be understood that these descriptions are only exemplary and are not intended to limit the scope of the present invention. In addition, in the following description, the description of well-known structures and technologies is omitted to avoid unnecessary confusion of the concept of the present invention.

[0050] Please refer to Figure 1 A first aspect of an embodiment of the present invention provides a method for preventing overspeed in extreme gusts of wind turbines, comprising the following steps:

[0051] Step S100: acquiring rotor speed data of the wind turbine generator set, and determining whether the operating condition of the wind turbine generator set is an extreme gust condition based on the rotor speed data.

[0052] Step S200, when the operating condition is an extreme gust condition, the generator speed data, the actual value of the pitch angle and the given pitch rate of the wind turbine are obtained.

[0053] Through various sensors in the wind turbine, the generator speed data, actual value of the pitch angle and given pitch rate of the wind turbine can be obtained.

[0054] Step S300, calculating the superimposed pitch rate by combining the generator speed data through the PD control strategy.

[0055] Step S400, based on the sum of the superimposed pitch rate and the given pitch rate, a pitch angle adjustment value is calculated, and the wind turbine blades are controlled to perform early pitch change according to the pitch angle adjustment value.

[0056] Based on the hysteresis in traditional pitch control, in order to avoid serious overshoot in extreme gust conditions, a differential term is introduced in the pitch control to predict the trend of error change, thereby suppressing the error in advance and improving the dynamic characteristics of the system during adjustment.

[0057] First, the control method adopts the PD control strategy and combines the generator speed data to calculate the superimposed pitch rate. This calculation method based on control theory can reasonably determine the pitch rate that needs to be additionally superimposed according to the real-time generator speed of the unit, so as to more accurately guide the pitch angle adjustment to adapt to the complex changes under extreme gust conditions; secondly, the pitch angle adjustment value is calculated based on the sum of the superimposed pitch rate and the given pitch rate, and the wind turbine blade pitch angle adjustment value is controlled accordingly to perform advance pitch change. Through such a systematic calculation and control process, the wind turbine pitch angle can be accurately and timely adjusted under extreme gust conditions, effectively preventing the wind turbine from overspeeding due to extreme gusts, and ensuring the safe and stable operation of the wind turbine under extreme conditions; finally, it is accurately judged whether the operating condition of the wind turbine is an extreme gust condition. This is based on the acquisition and analysis of the wind rotor speed data, which provides an accurate premise for subsequent targeted control measures.

[0058] When it is judged to be an extreme gust condition, differential control is introduced into the original pitch control, and the system output differential is used as the superimposed pitch rate V p , the pitch actuator adjusts the blade pitch, so that the wind turbine pitch control module can adjust the blade pitch according to the calculated superimposed pitch rate V within the pitch angle sampling interval Δt. p The pitch angle is added to the actual value of the pitch angle and the given pitch rate V0 to obtain the pitch angle adjustment value, and the wind turbine pitch angle is changed according to the pitch angle adjustment value to achieve early pitch change.

[0059] In addition, if the wind turbine generator set exits the extreme gust condition or is in other conditions at this time, the wind turbine generator set pitch control executes the original variable pitch control scheme.

[0060] In one implementation of the embodiment of the present invention, judging whether the operating condition of the wind turbine generator set is an extreme gust condition based on the wind rotor speed data in step S100 includes:

[0061] Step S110, obtaining the rotor speed and rotor speed acceleration of the wind turbine.

[0062] Obtaining the two key data of the wind turbine rotor speed and rotor speed acceleration is crucial for judging the extreme gust conditions, and can reflect the changes in the operating status of the wind rotor from different angles; the wind rotor speed directly reflects the current rotation speed of the wind rotor, while the wind rotor speed acceleration further describes the changing trend of the wind rotor speed. Through the comprehensive analysis of these two data, the special state of the wind rotor under the influence of extreme gusts can be captured more accurately.

[0063] Step S120: When both the rotor speed and the rotor speed acceleration exceed corresponding thresholds, it is determined that the wind turbine generator set is in an extreme gust condition.

[0064] When both the rotor speed and the rotor speed acceleration exceed the corresponding thresholds, the wind turbine is judged to be in extreme gust conditions. The above two thresholds are key limit values ​​determined after a large number of experiments and theoretical analysis. The reason why both are required to exceed the threshold is that a high rotor speed alone may just be a normal high wind speed situation, while a high rotor speed acceleration alone may also be caused by other interference factors. Only when both meet the conditions of exceeding the threshold at the same time, it is more likely to be caused by special conditions such as extreme gusts.

[0065] In the process of detecting extreme gust conditions in S100, the initial control parameters of the wind turbine remain unchanged, and the wind rotor speed data ω is collected through the sensor module. When the wind rotor speed and wind rotor acceleration exceed a certain limit, it can be judged as an extreme gust condition. The wind rotor speed acceleration is (ω i+1 -ω i ) / Δt,ω i and ω i+1 They are the wind wheel speeds separated by a sampling time respectively.

[0066] Among them, during the entire S100 extreme gust condition detection process, the initial control parameters of the wind turbine remain unchanged in order to ensure that the detection process will not be interfered with by other human control factors and to ensure that the detection results are completely based on the actual situation reflected by the wind rotor speed data itself.

[0067] Furthermore, after obtaining the rotor speed acceleration of the wind turbine generator set, the method further includes:

[0068] Step S111, performing mean filtering on the wind wheel speed acceleration.

[0069] The wind rotor acceleration is further processed by mean filtering to filter out the interference of noise in the wind rotor acceleration. On the one hand, wind turbines are subject to interference from various complex factors in the actual operating environment. For example, the sensor itself may have certain measurement errors, or electromagnetic interference, mechanical vibration and other factors in the surrounding environment may cause some slight fluctuations and noise in the collected wind rotor speed acceleration data. If these noises are not processed, the calculated wind rotor speed acceleration may be inaccurate, which in turn affects the judgment of extreme gust conditions. On the other hand, mean filtering can effectively smooth these data. By averaging a certain number of data points, outliers and high-frequency noise caused by accidental factors can be removed, making the wind rotor speed acceleration data more stable and reliable.

[0070] In this way, when comparing with the threshold to determine whether it is an extreme gust condition, the possibility of misjudgment can be reduced. Because the judgment of extreme gust conditions is based on whether the wind rotor speed and the acceleration of the wind rotor speed exceed the corresponding threshold, if the acceleration data has erroneous peaks or valleys due to noise, it may lead to erroneous judgment that the wind turbine is in or not in an extreme gust condition. The mean filter processing can help avoid this situation and improve the accuracy of the entire judgment process.

[0071] In another implementation of the embodiment of the present invention, the step S300 of calculating the superimposed pitch rate by using the PD control strategy in combination with the generator speed data includes:

[0072] Step S310, calculating the speed change rate of the generator based on the generator speed data.

[0073] Calculating the speed change rate of the generator can dynamically capture the changing trend of the generator speed. Under extreme gusty conditions, the speed of the wind turbine generator will change rapidly. By calculating the speed change rate, we can accurately understand the speed of this change. For wind turbines, the speed change rate provides more detailed operating status information for subsequent control strategies, allowing the control strategy to respond in advance according to this changing trend, rather than just adjusting based on the current speed.

[0074] Step S320, calculating the differential increment of the rotational speed change rate based on the PD control strategy.

[0075] In the PD control strategy, calculating the differential increment of the speed change rate can reflect the instantaneous change of the speed change rate. In wind turbines, the differential increment can help capture the more subtle dynamic effects of extreme gusts on the generator speed. For example, when the gust intensity suddenly increases or decreases, the differential increment of the speed change rate can reflect this change in a timely manner. In this way, the PD control strategy can more keenly perceive the slight fluctuations in the operating state of the wind turbine, thereby providing a basis for more precise control and avoiding abnormal conditions such as wind turbine overspeed due to ignoring these slight fluctuations.

[0076] Step S330, calculating the output increment of the PD control based on the differential increment of the rotational speed change rate.

[0077] The output increment of the PD control is calculated based on the differential increment of the speed change rate. The output increment combines the information of the proportional (P) and differential (D) links. The proportional link controls according to the current generator speed change rate, while the differential link controls according to the instantaneous change of the speed change rate. The output increment can accurately adjust the intensity of the control signal according to the actual operating status of the wind turbine, especially the dynamic changes under extreme gust conditions. Dynamically adjusting the control intensity according to the change of the wind turbine generator speed makes the control more accurate and timely, and effectively suppresses the overspeed trend of the wind turbine due to extreme gusts.

[0078] Step S340, based on the output increment and in combination with the proportional control increment, a superimposed pitch rate is obtained.

[0079] The superimposed pitch rate is obtained based on the output increment and combined with the proportional control increment. The superimposed pitch rate comprehensively considers the proportional and differential information in the PD control strategy, and can accurately determine the additional superimposed pitch rate required under extreme gust conditions. The adjustment of the pitch angle in the wind turbine directly affects the capture of wind energy and the speed of the unit. Through this precisely calculated superimposed pitch rate, the pitch angle can be adjusted appropriately to cope with the impact of extreme gusts. For example, when extreme gusts cause the generator speed to have an overspeed trend, this superimposed pitch rate can adjust the pitch angle in time to return the speed of the wind turbine to a safe range, thereby ensuring the safe and stable operation of the wind turbine under extreme conditions.

[0080] Further, the calculation of the speed change rate of the generator based on the generator speed data in step S310 includes:

[0081] Step S311, obtaining the generator speed values ​​of two adjacent detection cycles.

[0082] Step S312, calculating the speed change rate of the generator based on the two generator speed values ​​and the time interval between two adjacent detection cycles.

[0083] Specifically, the formula for calculating the rate of change of generator speed is as follows:

[0084] GenAcc=(G i+1 -G i ) / Δt;

[0085] In the above formula, G i and G i+1 are the generator speeds separated by a sampling time, and Δt is the time interval between two adjacent detection cycles.

[0086] In addition, after the generator speed change rate is obtained, a first-order low-pass filtering process may be performed.

[0087] Further, the calculation of the differential increment of the rotation speed change rate in step S320 includes:

[0088] Step S321, obtaining two adjacent speed change rates of the generator.

[0089] Step S322, calculating the differential increment of the speed change rate based on two adjacent speed change rates and the time interval between two adjacent detection cycles.

[0090] The differential increment is calculated based on the generator speed change rate GenAcc. The differential increment of the speed change rate is as follows:

[0091] GenErrAcc=GenAcc i+1 -GenAcc i ;

[0092] Among them, GenErrAcc is the differential increment, GenAcc i+1 is the speed change rate of the i+1th detection cycle, GenAcc i is the speed change rate of the i-th detection cycle.

[0093] Furthermore, the calculation formula of the output increment of PD control is:

[0094] x=k d ×GenErrAcc;

[0095] Where x is the output increment, k d is the differential control coefficient.

[0096] Further, after calculating the output increment of the PD control in step S330, the method further includes:

[0097] Step S331, limiting the output increment.

[0098] Specifically, the calculation formula for the limiting process is:

[0099]

[0100] Among them, x is the output increment, L is the upper limit of the output increment, and -L is the lower limit of the output increment.

[0101] After obtaining the output increment after the limiting process, the final superimposed pitch rate V is obtained by summing the differential control output after limiting, the integral control output and the proportional part output. p , combined with a given pitch change rate, the pitch angle adjustment value is calculated, and the wind turbine pitch angle is changed according to the pitch angle adjustment value to achieve advance pitch change.

[0102] like Figure 2a , Figure 2b and Figure 2c As shown, compared with the traditional control strategy, the present invention can effectively reduce the fluctuation of the rotation speed by enabling the gust control strategy, suppress the increase in the rotation speed, and avoid triggering an overspeed fault shutdown. Moreover, enabling the gust control strategy can effectively suppress the front and rear vibrations of the cabin and reduce the blade root load. Therefore, the above control method can effectively suppress the overspeed and excessive vibration of the generator under extreme gust conditions, so that the unit can operate within the design speed range without stopping or disconnecting from the grid. In addition, it can also effectively reduce the limit load of the blade root of the unit and reduce the design cost of the unit.

[0103] Accordingly, please refer to Figure 3 A second aspect of an embodiment of the present invention provides a wind turbine extreme gust overspeed prevention control device, comprising:

[0104] The operating condition judgment module 1 is used to obtain the rotor speed data of the wind turbine and judge whether the operating condition of the wind turbine is an extreme gust condition based on the rotor speed data;

[0105] The data acquisition module 2 is used to obtain the generator speed data, the actual value of the pitch angle and the given pitch rate of the wind turbine when the operating condition is an extreme gust condition;

[0106] The pitch calculation module 3 is used to calculate the superimposed pitch rate by combining the generator speed data through the PD control strategy;

[0107] The pitch adjustment module 4 is used to calculate the pitch angle adjustment value based on the sum of the superimposed pitch rate and the given pitch rate, and control the wind turbine blades to perform early pitch change according to the pitch angle adjustment value.

[0108] Accordingly, a third aspect of an embodiment of the present invention provides an electronic device, comprising: at least one processor; and a memory connected to the at least one processor; wherein the memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor so that the at least one processor executes the above-mentioned wind turbine extreme gust anti-overspeed control method.

[0109] Accordingly, a fourth aspect of an embodiment of the present invention provides a computer-readable storage medium having computer instructions stored thereon, which, when executed by a processor, implement the above-mentioned method for preventing overspeed control of extreme gusts of wind turbines.

[0110] The embodiment of the present invention aims to protect a method and device for preventing overspeed control of a wind turbine in extreme gusts, wherein the method includes the following steps: obtaining the rotor speed data of the wind turbine, and judging whether the operating condition of the wind turbine is an extreme gust condition based on the rotor speed data; when the operating condition is an extreme gust condition, obtaining the generator speed data, the actual value of the pitch angle, and the given pitch rate of the wind turbine; calculating the superimposed pitch rate in combination with the generator speed data through the PD control strategy; calculating the pitch angle adjustment value based on the sum of the superimposed pitch rate and the given pitch rate, and controlling the wind turbine blades to perform early pitch change according to the pitch angle adjustment value. The above technical solution has the following effects:

[0111] 1. The PD control strategy is used in combination with the generator speed data to calculate the superimposed pitch rate. This calculation method based on control theory can reasonably determine the additional superimposed pitch rate according to the real-time generator speed of the unit, thereby more accurately guiding the pitch angle adjustment to adapt to the complex changes under extreme gust conditions;

[0112] 2. The pitch angle adjustment value is calculated based on the sum of the superimposed pitch rate and the given pitch rate, and the wind turbine blades are controlled to change pitch in advance according to the pitch angle adjustment. Through such a systematic calculation and control process, the pitch angle of the wind turbine can be accurately and timely adjusted under extreme gust conditions, effectively preventing the wind turbine from overspeeding due to extreme gusts, and ensuring the safe and stable operation of the wind turbine under extreme conditions.

[0113] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems, or computer program products. Therefore, the present application may adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment in combination with software and hardware. Moreover, the present application may adopt the form of a computer program product implemented in one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) that include computer-usable program code.

[0114] 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.

[0115] 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 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0116] 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 A step that specifies a function in one or more boxes.

[0117] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the relevant field should understand that the specific implementation methods of the present invention can still be modified or replaced by equivalents. Any modification or equivalent replacement that does not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. A method for preventing overspeed in extreme gusts of wind turbines, characterized in that: The steps include: Obtaining rotor speed data of a wind turbine generator set, and determining whether an operating condition of the wind turbine generator set is an extreme gust condition based on the rotor speed data; When the operating condition is an extreme gust condition, obtaining the generator speed data, the actual value of the pitch angle and the given pitch rate of the wind turbine generator set; By using the PD control strategy, the superimposed pitch rate is calculated in combination with the generator speed data; Based on the sum of the superimposed pitch rate and the given pitch rate, a pitch angle adjustment value is calculated, and the wind turbine blades are controlled to perform early pitch change according to the pitch angle adjustment value.

2. The method for preventing overspeed in extreme gusts of wind turbine according to claim 1, characterized in that: The determining, based on the wind rotor speed data, whether the operating condition of the wind turbine generator set is an extreme gust condition includes: Obtaining a wind rotor speed and a wind rotor speed acceleration of the wind turbine generator set; When both the wind rotor speed and the wind rotor speed acceleration exceed corresponding thresholds, it is determined that the wind turbine generator set is in an extreme gust operating condition.

3. The method for preventing overspeed in extreme gusts of wind turbine according to claim 2, characterized in that: After obtaining the acceleration of the wind turbine rotor speed, the method further includes: The wind wheel speed acceleration is subjected to mean filtering.

4. The method for preventing overspeed in extreme gusts of wind turbine according to claim 1, characterized in that: The method of calculating the superimposed pitch rate by using the PD control strategy in combination with the generator speed data includes: Calculating the speed change rate of the generator based on the generator speed data; Based on the PD control strategy, calculating the differential increment of the speed change rate; Calculating an output increment of the PD control based on the differential increment of the speed change rate; Based on the output increment, combined with the proportional control increment, a superimposed pitch rate is obtained.

5. The method for preventing overspeed in extreme gusts of wind turbine according to claim 4, characterized in that: After calculating the output increment of the PD control, the method further includes: performing a limiting process on the output increment; The calculation formula for the limiting processing is: Among them, x is the output increment, L is the upper limit of the output increment, and -L is the lower limit of the output increment.

6. The method for preventing overspeed in extreme gusts of wind turbine according to claim 4, characterized in that: The step of calculating the speed change rate of the generator based on the generator speed data includes: Obtain the generator speed values ​​of two adjacent detection cycles; The speed change rate of the generator is calculated based on two generator speed values ​​and a time interval between two adjacent detection cycles.

7. The method for preventing overspeed in extreme gusts of wind turbine according to claim 6, characterized in that: The step of calculating the differential increment of the rotational speed change rate comprises: Obtaining two adjacent speed change rates of the generator; Based on two adjacent rotational speed change rates and a time interval between two adjacent detection cycles, a differential increment of the rotational speed change rate is calculated.

8. A wind turbine extreme gust overspeed control device, characterized in that: include: A working condition judgment module, which is used to obtain the rotor speed data of the wind turbine set, and judge whether the operating condition of the wind turbine set is an extreme gust condition based on the rotor speed data; A data acquisition module, which is used to acquire the generator speed data, the actual value of the pitch angle and the given pitch rate of the wind turbine when the operating condition is an extreme gust condition; A pitch calculation module, which is used to calculate the superimposed pitch rate by combining the generator speed data through the PD control strategy; The pitch adjustment module is used to calculate a pitch angle adjustment value based on the sum of the superimposed pitch rate and the given pitch rate, and control the wind turbine blades to perform early pitch change according to the pitch angle adjustment value.

9. An electronic device, characterized in that: include: at least one processor; And a memory connected to the at least one processor; wherein the memory stores instructions that can be executed by the at least one processor, and the instructions are executed by the at least one processor so that the at least one processor executes the extreme gust overspeed prevention control method for a wind turbine as described in any one of claims 1-7.

10. A computer-readable storage medium, characterized in that: Computer instructions are stored thereon, and when the instructions are executed by the processor, the method for preventing overspeed from extreme gusts of wind turbine set as claimed in any one of claims 1 to 7 is implemented.

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