Methods, apparatuses, and systems for vortex-induced vibration control of a wind turbine

Abstract

Provided are an anti-vortex vibration control method, device and system for a wind turbine. The anti-vortex vibration control method comprises: determining a wind speed at a location where the wind turbine is located; in response to the wind speed being less than or equal to a first wind speed threshold, determining an anti-vortex position of a blade of the wind turbine to be a first preset anti-vortex position and sending a first control instruction for pitching the blade to the first preset anti-vortex position to a pitch system, the first wind speed threshold being a wind speed threshold in an extreme wind condition where the wind speed exceeds a threshold value; and in response to the wind speed being greater than the first wind speed threshold, determining the anti-vortex position of the blade of the wind turbine to be a second preset anti-vortex position different from the first preset anti-vortex position and sending a second control instruction for pitching the blade to the second preset anti-vortex position to the pitch system. The anti-vortex vibration control method of the present disclosure can reduce vortex-induced vibration of the wind turbine in an extreme wind condition.

Description

Technical Field

[0001] This application relates to the field of wind power, and more specifically, to a method, apparatus and system for controlling vortex-induced vibration in wind turbine generator sets. Background Technology

[0002] When airflow passes over the surface of a slender cylindrical structure (e.g., a tower), pair of antisymmetric vortices emerge downstream due to boundary layer instability. The generation and release of these vortices directly affect the periodic changes in excitation on the tower surface. When the excitation frequency (fs) is close to the tower's natural frequency (f), the tower vibration is amplified. Simultaneously, this vibration influences the flow field in the opposite direction, intensifying the excitation and resulting in large-amplitude vibrations. This fluid-structure interaction phenomenon is called vortex-induced vibration.

[0003] When a wind turbine (also known as a wind turbine, generator set, or wind power unit) is shut down, if all three blades of the turbine are stopped at around 90° (feathered state), vortex-induced vibration is more likely to occur. However, if one of the blades is stopped at 40°, the probability of vortex-induced vibration can be greatly reduced.

[0004] However, existing anti-vortex-induced vibration schemes are still prone to vortex-induced vibration under extreme wind conditions. That is to say, even when the three blades of the wind turbine are stopped at anti-vortex pitch angles of 90°-90°-40° respectively, vortex-induced vibration is still relatively easy to occur under extreme wind conditions. Summary of the Invention

[0005] In order to at least solve the above-mentioned problems in the prior art, this disclosure provides a method, apparatus and system for controlling vortex-induced vibration of wind turbines.

[0006] According to a first aspect of this disclosure, a method for controlling vortex-induced vibration of a wind turbine includes: determining the wind speed at the location of the wind turbine; in response to the wind speed being less than or equal to a first wind speed threshold, determining the anti-vortex position of the wind turbine blades as a first preset anti-vortex position and sending a first control command to a pitch system to pitch the blades to the first preset anti-vortex position, wherein the first wind speed threshold is a wind speed threshold under extreme wind conditions where the wind speed exceeds a threshold; and in response to the wind speed being greater than the first wind speed threshold, determining the anti-vortex position of the wind turbine blades as a second preset anti-vortex position different from the first preset anti-vortex position and sending a second control command to the pitch system to pitch the blades to the second preset anti-vortex position.

[0007] According to a second aspect of this disclosure, a method for controlling vortex-induced vibration of a wind turbine includes: determining whether the wind turbine has entered an anti-vortex mode; in response to the wind turbine entering the anti-vortex mode, activating the anti-vortex function and triggering a window period; adjusting the wind turbine blades to a first preset anti-vortex position or a second preset anti-vortex position different from the first preset anti-vortex position during the window period, wherein the window period indicates the minimum time required to complete the anti-vortex function, wherein the first preset anti-vortex position is an anti-vortex position determined in response to a wind speed less than or equal to a first wind speed threshold, the second preset anti-vortex position is an anti-vortex position determined in response to a wind speed greater than the first wind speed threshold, and the first wind speed threshold is a wind speed threshold under extreme wind conditions where the wind speed exceeds the preset threshold.

[0008] According to a third aspect of this disclosure, an anti-vortex vibration controller for a wind turbine may include: an anti-vortex mode confirmation module configured to determine whether the wind turbine has entered an anti-vortex mode; an anti-vortex trigger module configured to activate the anti-vortex function and trigger a window period in response to the wind turbine entering the anti-vortex mode; and an anti-vortex execution module configured to adjust the wind turbine blades to a first preset anti-vortex position or a second preset anti-vortex position different from the first preset anti-vortex position within the window period, wherein the window period indicates the minimum time required to complete the anti-vortex function, wherein the first preset anti-vortex position is an anti-vortex position determined in response to a wind speed less than or equal to a first wind speed threshold, the second preset anti-vortex position is an anti-vortex position determined in response to a wind speed greater than the first wind speed threshold, and the first wind speed threshold is a wind speed threshold under extreme wind conditions where the wind speed exceeds the preset threshold.

[0009] According to a fourth aspect of this disclosure, an anti-vortex-induced vibration control system for a wind turbine includes: a main control system configured to execute the above-described anti-vortex-induced vibration control method; and a pitch control system configured to execute the above-described anti-vortex-induced vibration control method.

[0010] According to a fifth aspect of this disclosure, a computer-readable storage medium storing a computer program, which, when executed by a processor, causes the processor to perform the aforementioned anti-vortex-induced vibration control method or to perform the aforementioned anti-vortex-induced vibration control method.

[0011] According to a sixth aspect of this disclosure, an electronic device includes: a processor; and a memory storing a computer program that, when executed by the processor, causes the processor to perform the above-described anti-vortex-induced vibration control method or to perform the above-described anti-vortex-induced vibration control method.

[0012] By applying the anti-vortex-induced vibration control method, apparatus and system for wind turbines according to embodiments of the present disclosure, vortex-induced vibration under extreme wind conditions can be addressed, reducing the workload of maintenance personnel and minimizing economic losses. Attached Figure Description

[0013] Figure 1This is a schematic diagram illustrating the structure of an anti-vortex-induced vibration control system for a wind turbine according to an embodiment of the present disclosure.

[0014] Figure 2 This is a flowchart illustrating a method for controlling vortex-induced vibration of a wind turbine according to a first embodiment of the present disclosure.

[0015] Figure 3 This is a flowchart illustrating a first anti-vortex position switching control according to an embodiment of the present disclosure.

[0016] Figure 4 This is a flowchart illustrating a second anti-vortex position switching control according to an embodiment of the present disclosure.

[0017] Figure 5 This is a flowchart illustrating a method for controlling vortex-induced vibration of a wind turbine according to a second embodiment of the present disclosure.

[0018] Figure 6 This is a flowchart illustrating the process of selecting the anti-vortex target position pitch angle according to an embodiment of the present disclosure.

[0019] Figure 7 An example flowchart illustrating the anti-vortex process of a master control system according to an embodiment of the present disclosure is shown.

[0020] Figure 8 An example flowchart illustrating the desiccation process of a master control system according to an embodiment of the present disclosure is shown.

[0021] Figure 9 An example flowchart illustrating the anti-vortex process of a pitch system according to an embodiment of the present disclosure is shown.

[0022] Figure 10 An example flowchart illustrating the anti-vortex process of an atmospheric pressure pitch system according to an embodiment of the present disclosure is shown.

[0023] Figure 11 An example flowchart illustrating the devortex process of an atmospheric pressure pitch system according to an embodiment of the present disclosure is shown.

[0024] Figure 12 A block diagram of an anti-vortex-induced vibration control device for a wind turbine according to an embodiment of the present disclosure is shown.

[0025] The present disclosure will be described in detail below with reference to the accompanying drawings, throughout which the same or similar elements will be indicated by the same or similar reference numerals. Detailed Implementation

[0026] The following detailed description is provided to aid in obtaining a full understanding of the methods, apparatus, and / or systems described herein. However, the order of operations described herein is merely illustrative and is not limited to those orders set forth herein; equivalent substitutions or changes may be made, except for operations that must occur or be performed in a specific order. Furthermore, for clarity and conciseness, descriptions of content well-known in the art will be omitted or simplified.

[0027] Unless otherwise defined, all terms used herein (including technical and scientific terms) shall have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure pertains upon understanding this disclosure. Unless expressly defined herein, terms (such as those defined in a general dictionary) shall be interpreted as having a meaning consistent with their meaning in the context of the relevant field and in this disclosure, and shall not be interpreted in an idealized or overly formalistic manner.

[0028] Unless otherwise specified, the same reference numerals generally refer to the same elements (e.g., components, steps, and methods). Reference numerals described in previous embodiments that reappear in later embodiments may be omitted. Furthermore, technical features described in different or the same embodiments can be combined in any way, as long as the combined embodiment or technical solution is complete and can solve the technical problems of this application or achieve the technical effects described or not described in this disclosure but which can be determined based on the complete technical solution described above. The terminology used in this disclosure is explained below.

[0029] Normal stop pitch angle: When the engine is stopped, the stop angle of all three blades is about 90°. 90° is the normal stop pitch angle.

[0030] Anti-vortex pitch angle: In the shutdown state, the shutdown angle of the three blades is 90°-90°-X°, where X° is the anti-vortex pitch angle (in the following text, 40° and 70° will be used as examples for the dual anti-vortex description. It should be understood that different wind turbine models can be set with different anti-vortex pitch angles, such as the first anti-vortex pitch angle (30° to 50°) or the second anti-vortex pitch angle (60° to 80°), and a certain deviation between the actual blade angle and the anti-vortex pitch angle is allowed, for example, a deviation of ±0.5° or ±1°).

[0031] Shutdown anti-vortex mode: After the wind turbine enters the shutdown state, the three blades first retract to the normal shutdown pitch angle, and then the corresponding anti-vortex blades automatically extend to the anti-vortex pitch angle (for example, 40° or 70°). This is the shutdown anti-vortex mode.

[0032] Planned power outage anti-vortex mode: In the event of an impending power outage, wind turbines are shut down in advance and restarting is prohibited. This ensures that the turbines remain in anti-vortex mode after the power outage, meaning the turbine pitch angle is maintained at 90°-90°-40° or 90°-90°-70°. This is the planned power outage anti-vortex mode. Furthermore, in this mode, the wind turbines should be aligned with the predicted prevailing wind direction.

[0033] Unplanned Power Outage Anti-Vortex Mode: When the wind turbine is in the startup, power generation, or shutdown process, and the blade pitch angle is less than 40° (or 70°), a power outage due to a grid fault or turbine failure will trigger the wind turbine to enter the unplanned power outage anti-vortex mode. During the emergency stop and blade retraction process, the anti-vortex blades stop at 40° (or 70°), while the non-anti-vortex blades stop at 90°. Furthermore, if the pitch angle of the anti-vortex blades is greater than 40° (or 70°) during the unplanned power outage, the blades cannot open to a smaller angle due to the wind turbine's safety chain protection function. Therefore, the anti-vortex blades cannot reach 40° (or 70°), and the anti-vortex function cannot be achieved. In the exemplary embodiments of this disclosure, the unplanned power outage anti-vortex function is implemented independently by the wind turbine's pitch control system.

[0034] Forced anti-vortex mode: When the wind turbine is under maintenance or the power grid is down and the turbine is powered by an external power source, the turbine is manually controlled to enter anti-vortex mode by sending a command. In forced anti-vortex mode, the wind turbine should be aligned with the predicted prevailing wind direction.

[0035] In the prior art, pitch systems typically include atmospheric pressure pitch systems and low-pressure pitch systems. Atmospheric pressure pitch systems may include, for example, "Dan Control Platform" or "Huichuan Platform", while low-pressure pitch systems may include, for example, "Low-Pressure Platform".

[0036] Normal pitch control mode: The pitch system is fault-free, and the blade movement is controlled by the wind turbine's main control system.

[0037] Pitch fault mode (or emergency stop mode): There is a fault in the pitch system. The blade movement is controlled by the pitch controller to bring the pitch back to the normal stopping pitch angle at a preset speed (e.g., 2° / s).

[0038] Pitch anti-vortex mode: The mode in which the pitch system performs anti-vortex function.

[0039] Pitch drive enable: When the pitch drive enable is deactivated (e.g., when the pitch drive enable signal is at a preset voltage (e.g., 0V)), the pitch drive will brake the motor for a very short time and then apply the brakes after stopping. During this time, the motor will not rotate under any circumstances.

[0040] Virtual limit switch for pitch drive: When the pitch drive enable is deactivated by the pitch controller, the pitch controller sets a virtual limit value for the pitch drive (e.g., 0°~40° or 0°~70°). At this time, even if the pitch drive enable is restored, the motor can only operate between 0°~40° or 0°~70°, ensuring that after the wind turbine is powered back on, the pitch drive will not automatically retract to 90° before communication is established between the pitch controller and the pitch drive. This virtual limit switch is only applicable to the Dan control platform because when the Dan control platform is powered back on, the pitch drive initializes before the pitch controller. Before communication is established, the pitch controller cannot output a signal to deactivate the pitch drive. If the safety chain is disconnected and the 89° switch is not triggered, the pitch drive will automatically retract. Therefore, the virtual limit switch function of the pitch drive needs to be enabled to ensure that the pitch drive maintains its current position even after the vortex suppression is completed and the safety chain is disconnected. However, it should be understood that the aforementioned virtual limit function can also be applied to other pitch platforms that have similar problems to the Dan control platform.

[0041] Planned power outage window: The time required for the anti-vortex blades to adjust from 90° to 40° (or 70°) during shutdown and from 40° (or 70°) to 90° during startup. The calculation formula is:

[0042]

[0043] The compensation time is the time it takes for the pitch controller to cut off the pitch driver enable and write the virtual limit. This refers to the time required for the anti-vortex blades to adjust from 90° to 40° (or 70°) and from 40° (or 70°) back to 90°. 0 indicates the anti-vortex blades are in the target position and no angle adjustment is needed; 120s is the maximum window length. Furthermore, since only the Dan control platform needs to activate the virtual limit function of the pitch drive, the compensation time for the Dan control platform can be set higher than that for the Huichuan platform and the low-pressure platform. For example, the compensation time for the Dan control platform can be 30s, while the compensation time for the Huichuan platform and the low-pressure platform can be 10s. Additionally, the length setting of the planned power outage window can be similarly applied to other situations where the anti-vortex blade angle is adjusted from the normal shutdown pitch angle to the anti-vortex pitch angle while the wind turbine is shut down (e.g., forced anti-vortex mode, shutdown anti-vortex mode).

[0044] Unplanned power outage window period: When a wind turbine experiences an unplanned power outage, it needs to complete a vortex-resistant attitude adjustment of 90°-90°-40° (or 70°) within a specified time. The time taken for this process is the unplanned power outage window period. Its calculation formula is:

[0045]

[0046] If the blades are at Y° when the power is lost, the fan needs at least 90°-90°-40° (or 70°) to achieve an anti-vortex posture. The time to adjust to this attitude is 1 second, where Δ is the preset deviation time, and the minimum window period is 1 second. The larger of these values ​​is 120s. For example, assuming the blades are at 0° when power is lost, the propeller retraction speed is 1° / s, Δ is 5s, the compensation time of the Dan control platform is 30s, and the compensation time of the Huichuan platform and the low-pressure platform is 10s, then this window period is at least 95s. The window period can refer to the minimum time required to switch from the first preset anti-vortex position to the second preset anti-vortex position.

[0047] Paddle jamming: When the wind turbine triggers an emergency stop and retracts the paddles, if the pitch system determines that the blade position change is less than, for example, 1° within a preset time (e.g., 5 seconds) before the blades reach a safe position, it is considered blade jamming. The jamming logic applies to any blade, and anti-vortex functionality cannot be executed after jamming. It should be understood that an anti-vortex blade stopping in the anti-vortex position does not constitute blade jamming.

[0048] Figure 1 This is a schematic diagram illustrating the structure of an anti-vortex-induced vibration control system for a wind turbine according to an embodiment of the present disclosure.

[0049] like Figure 1 As shown, the anti-vortex-induced vibration control system 100 may include a main control system 110 and a pitch system 120. The main control system 110 can control various operations of the pitch system 120, and the pitch system 120 can adjust the position of the wind turbine blades 200. The pitch system 120 may include a pitch controller 121, a relay 122, a pitch driver 123, a pitch motor 124, a pitch reducer 125, and a pitch bearing 126.

[0050] The main control system 110 can send the anti-vortex control word of the pitch system (which can be, for example, a 2-second pulse signal; control word 0 indicates that the anti-vortex function is on, 1 indicates that the pitch driver is cut off, 2 indicates that the anti-vortex function is off, 3 indicates that the anti-vortex function is forcibly off, 4 indicates dual anti-vortex angle switching (low level: anti-vortex position 1; high level: anti-vortex position 2), 6 indicates that the planned power failure anti-vortex function is enabled (bit6 high level / bit7 low level: on, bit6 low level / bit7 high level: off)), given anti-vortex position, anti-vortex speed, pitch enable and other information to the pitch controller 121 in the pitch system 120 for various pitch control purposes. The pitch controller 121 can feed back information to the main control system 110, such as pitch system anti-eddy feedback words (which can be valid under a given level, for example, valid under a high level; feedback word 0 indicates anti-eddy mode feedback is enabled, 1 indicates anti-eddy function feedback is completed (e.g., pitch driver enable has been switched, virtual limit has been enabled), and 3 indicates overall anti-eddy status query pulse (2s pulse signal)), pitch system fault words (which can be valid under a given level, for example, valid under a high level, including fault words used to indicate pitch anti-eddy timeout and control words indicating large pitch anti-eddy position deviation), and actual blade pitch position.

[0051] The pitch controller 121 can control whether the pitch drive is enabled by controlling the activation of the relay 122. When the relay 122 contacts are open, the pitch drive 123 is not enabled and stops working, and the pitch motor 124 also stops rotating, so that the blade 200 can stop in the anti-vortex position.

[0052] The pitch controller 121 controls the pitch driver 123 by changing the pitch speed and activating the virtual limit function of the pitch driver 123, so that the pitch driver 123 drives the pitch motor 124 to a specified position.

[0053] The pitch actuator 123 can feed back the three-bladed pitch position and anti-vortex feedback signal to the pitch controller 121, and provide feedback to the pitch controller 121 on whether the blades have reached the specified position and whether anti-vortex has been completed.

[0054] The pitch driver 123 outputs control signals such as voltage signals, current signals, and brake signals to the pitch motor 124 to control the pitch motor 124. The pitch motor 124 drives the pitch reducer 125, which in turn drives the pitch bearing 126 via a toothed belt, thereby controlling the blade 200 to rotate to the specified position.

[0055] The aforementioned devices and components, and their functions, are known to those skilled in the art; therefore, for the sake of brevity, they will not be described in further detail here. The following will refer to… Figure 2 The vortex-induced vibration control method disclosed herein is described in detail. Figure 2The vortex-induced vibration control method shown can be executed by the main control system 110 independent of the pitch system 120 or manually, but this is only an example. Figure 2 The subject implementing the anti-vortex-induced vibration control method shown is not specifically restricted.

[0056] Figure 2 This is a flowchart illustrating a method for controlling vortex-induced vibration of a wind turbine according to a first embodiment of the present disclosure.

[0057] The anti-vortex-induced vibration control method according to embodiments of the present disclosure may include steps S1210, S1220 and S1230.

[0058] In step S1210, the wind speed at the location of the fan is determined. The wind speed here can be the average wind speed over a predetermined time period (e.g., the average wind speed over 10 minutes).

[0059] As an example, the wind speed at the location of the wind turbine can be determined by the crosswind gauge on the wind turbine.

[0060] In step S1230, in response to the wind speed being less than or equal to a first wind speed threshold, the anti-vortex position of the wind turbine blades is determined to be a first preset anti-vortex position, and a first control command is sent to the pitch system to adjust the blades to the first preset anti-vortex position. In other words, when the wind speed is relatively low, the wind turbine blades can remain at the first preset anti-vortex position.

[0061] The pitch controller 121 of the pitch system 120 can control the pitch driver 123 in response to a first control command, so that the pitch driver 123 drives the pitch motor 124 to a specified position (corresponding to the first preset anti-vortex position).

[0062] The first wind speed threshold here can be the wind speed threshold under extreme wind conditions where the wind speed exceeds the threshold threshold. The threshold threshold can be 28 m / s, and the first wind speed threshold can be 30 m / s. As another example, the first wind speed threshold can be greater than or equal to 28 m / s.

[0063] In step S1220, in response to the wind speed exceeding a first wind speed threshold, the anti-vortex position of the wind turbine blades is determined to be a second preset anti-vortex position, which is different from the first preset anti-vortex position, and a second control command is sent to the pitch system to adjust the blade pitch to the second preset anti-vortex position. The difference between the first and second preset anti-vortex positions can indicate a difference in minimum pitch angle; for example, the minimum pitch angle at the first preset anti-vortex position may be smaller than the minimum pitch angle at the second preset anti-vortex position.

[0064] The pitch controller 121 of the pitch system 120 can control the pitch driver 123 in response to a second control command, so that the pitch driver 123 drives the pitch motor 124 to a specified position (corresponding to the second preset anti-vortex position).

[0065] The minimum pitch angle of the blades in the first preset anti-vortex position can be in the range of 30 degrees to 50 degrees. For example, the pitch angle of the blades in the first preset anti-vortex position can be 90°-90°-40°. The minimum pitch angle of the blades in the second preset anti-vortex position can be in the range of 60 degrees to 80 degrees. For example, the pitch angle of the blades in the second preset anti-vortex position can be 90°-90°-70°.

[0066] The anti-vortex-induced vibration control method according to embodiments of the present disclosure may further include the step of controlling the switching of anti-vortex positions.

[0067] Specifically, the anti-vortex vibration control method according to the embodiments of this disclosure may further include a first anti-vortex position switching control step: in response to the blade pitching to a first preset anti-vortex position and the wind speed becoming greater than a first wind speed threshold, a second control command is sent to the pitching system to cause the blade pitching to a second preset anti-vortex position.

[0068] In other words, when the blade is in the first preset anti-vortex position and the wind speed exceeds the first wind speed threshold (extreme condition), a second control command can be sent to the pitch system to adjust the blade pitch to the second preset anti-vortex position. When this anti-vortex-induced vibration method is executed by the main control system or other control systems, whether the blade has adjusted to the first preset anti-vortex position can be determined based on information such as the actual blade pitch position fed back by the pitch system. When this anti-vortex-induced vibration method is executed manually, it can be judged by visual inspection or by other information that can reflect the actual position of the blade.

[0069] Figure 3 This is a flowchart illustrating a first anti-vortex position switching control according to an embodiment of the present disclosure.

[0070] The first anti-vortex position switching control according to an embodiment of the present disclosure may include steps S1310 and S1320. In step S1310, in response to the blade pitching to a first preset anti-vortex position and the wind speed becoming greater than a first wind speed threshold (from wind speed less than or equal to the first wind speed threshold to greater than the first wind speed threshold), the anti-vortex mode is exited. The minimum pitch angle of the blade at the first preset anti-vortex position is less than the minimum pitch angle of the blade at the second preset anti-vortex position.

[0071] In step S1320, in response to the blade pitching to the maximum pitch angle, the anti-vortex mode is re-entered, and a second control command is sent to the pitch system to make the blade pitch to the second preset anti-vortex position.

[0072] As an example, after all three blades have pitched to a 90° pitch angle, the system can re-enter anti-vortex mode and send a second control command to the pitch system to pitch the blades to a second preset anti-vortex position. In other words, the system can enter anti-vortex mode after the blades have completed feathering and pitch one of the blades to a 70° pitch angle at the second preset anti-vortex position.

[0073] The anti-vortex vibration control method according to an embodiment of the present disclosure may further include a second anti-vortex position switching control step: in response to the blade pitching to a second preset anti-vortex position and the wind speed becoming less than or equal to a first wind speed threshold and lasting for a first preset time, a first control command for causing the blade pitching to the first preset anti-vortex position is sent to the pitching system.

[0074] Figure 4 This is a flowchart illustrating a second anti-vortex position switching control according to an embodiment of the present disclosure.

[0075] In other words, when the blade is in the second preset anti-vortex position and the wind speed is lower than or equal to the first wind speed threshold, a first control command can be sent to the pitch system to make the blade pitch to the first preset anti-vortex position.

[0076] When the anti-vortex-induced vibration method is executed by the main control system or other control systems, whether the blade pitches to the second preset anti-vortex position can be determined based on information such as the actual position of the blade pitch fed back by the pitch system. When the anti-vortex-induced vibration method is executed manually, it can be judged by visual inspection or by other information that can reflect the actual position of the blade.

[0077] The second anti-vortex position switching control according to embodiments of the present disclosure may include steps S1410 and S1420.

[0078] In step S1410, in response to the blade pitching to the second preset anti-vortex position and the wind speed becoming less than or equal to the first wind speed threshold (from wind speed greater than the first wind speed threshold to less than or equal to the first wind speed threshold) and lasting for a first preset time, the anti-vortex mode is exited.

[0079] Delayed control after wind speed changes can avoid frequent switching between anti-vortex mode and other modes.

[0080] In step S1420, in response to the blade pitch being adjusted to the maximum pitch angle, the anti-vortex mode is re-entered, and a first control command is sent to the pitch system to adjust the blade pitch to the first preset anti-vortex position.

[0081] As an example, after all three blades have pitched to a 90° pitch angle, the system can re-enter anti-vortex mode and send a first control command to the pitch system to pitch the blades to a first preset anti-vortex position. In other words, the system can enter anti-vortex mode after the blades have completed feathering and pitch one of the blades to a 40° pitch angle at the first preset anti-vortex position.

[0082] In other words, the switching from the second preset anti-vortex position of 90°-90°-70° to the first preset anti-vortex position of 90°-90°-40° can be achieved by first exiting the anti-vortex mode, feathering the blade at the 70° pitch angle to 90°, then entering the anti-vortex mode, and finally controlling one of the blades to open to 40°.

[0083] Although not shown, the following methods can be used to switch when the wind speed changes from normal to extreme. For example, one method is to retract the three blades to 70°, then stop the anti-vortex blades from pitching, while the other two blades continue to retract to 90°. Another method is to retract all three blades to 90° according to the normal shutdown procedure, and then reduce the anti-vortex blades to 70° at a small angle.

[0084] Since the impeller continues to rotate during unit shutdown, the former anti-vortex pitch control strategy will result in impeller aerodynamic imbalance, leading to fatigue loads on the unit. Therefore, the latter anti-vortex pitch control strategy can be adopted. Similarly, when starting the unit, the anti-vortex blades must first be retracted to 90°, and then all three blades must be simultaneously extended to start the unit.

[0085] In summary, when the turbine is in dual anti-vortex position, if the wind speed exceeds the first wind speed threshold, the turbine exits anti-vortex mode, and after all three blades stop at the maximum shutdown pitch angle, it re-enters anti-vortex mode. At this time, the anti-vortex blades will stop at the second preset anti-vortex position. Once the wind speed decreases to meet the conditions, the turbine exits anti-vortex mode, all three blades stop at the maximum shutdown pitch angle, and the turbine re-enters anti-vortex mode. At this time, the anti-vortex blades will stop at the first preset anti-vortex position.

[0086] Figure 5 This is a flowchart illustrating a method for controlling vortex-induced vibration of a wind turbine according to a second embodiment of the present disclosure. Figure 5 The anti-vortex-induced vibration control method shown can be implemented by the pitch control system of the wind turbine.

[0087] Reference Figure 5 In step S210, it can be determined whether the fan has entered anti-vortex mode.

[0088] As previously mentioned, anti-vortex modes can include shutdown anti-vortex mode, planned power outage anti-vortex mode, unplanned power outage anti-vortex mode, and forced anti-vortex mode. These anti-vortex modes have been explained in detail above and will not be repeated here.

[0089] In embodiments of this disclosure, the pitch system 120 can determine whether the wind turbine has entered anti-vortex mode by determining whether it receives an anti-vortex activation signal from the main control system 110, or by determining whether a first preset condition for an unplanned power outage anti-vortex mode is met. In response to receiving an anti-vortex activation signal from the main control system 110 or meeting the first preset condition for an unplanned power outage anti-vortex mode, the pitch system 120 can determine that the wind turbine has entered anti-vortex mode.

[0090] More specifically, when the main control system 110 determines that the second preset condition for the shutdown anti-vortex mode, the third preset condition for the planned power outage anti-vortex mode, or the fourth preset condition for the forced anti-vortex mode is met, the main control system 110 can send an anti-vortex activation signal to the pitch system 120, causing the pitch system to proceed to the next operation. Alternatively, in the event of an unplanned power outage, the pitch system 120 can also independently determine whether to enter the anti-vortex mode based on whether the first preset condition for the unplanned power outage anti-vortex mode is met.

[0091] In embodiments of this disclosure, the first preset condition may include: an unplanned power outage of the wind turbine, and the blade pitch angle of the wind turbine at the time of the power outage is less than the anti-vortex pitch angle. The second preset condition may include: the wind turbine is in a shutdown state and the shutdown anti-vortex function is activated. The third preset condition may include: the wind turbine is in a shutdown state and the planned power outage anti-vortex function is activated. The fourth preset condition may include: the wind turbine is in a shutdown or maintenance state and the forced anti-vortex function is activated. It should be understood that the above preset conditions are merely examples, and this disclosure is not limited thereto; the specific content of each preset condition can be modified, added, or deleted according to actual needs.

[0092] In the event of an unexpected power outage, the unit's safety chain will be abnormal, and the main control system will be unable to control the pitch control to stop the turbine to the anti-vortex pitch angle. Therefore, in the event of a power grid failure, the pitch control system performs the anti-vortex function during unplanned power outages. When the unit is unable to perform anti-vortex function, a diesel generator is required to supply power to the unit, and then maintenance personnel at the base of the tower control the unit's pitch control to the anti-vortex pitch angle.

[0093] In step S220, in response to the wind turbine entering anti-vortex mode, the anti-vortex function can be activated and the window period can be triggered.

[0094] In embodiments of this disclosure, as explained above regarding the window period, the window period indicates the minimum time required for the pitch system 120 to complete the anti-vortex function; that is, the time required to adjust the three blades of the wind turbine to 90°-90°-40° (or 70°), disable the pitch driver enable of the pitch drive, and (in the case of the control platform) write the virtual limit. As described above, the length of the window period may depend on a preset pitch rate and a preset compensation time for the pitch driver (i.e., considering the preset compensation time for disabling the pitch driver enable and writing the virtual limit), and in the case of unplanned power outage anti-vortex mode, it also depends on the angle of the wind turbine blades at the time of power outage.

[0095] Furthermore, in embodiments of this disclosure, the trigger window period refers to the start of timing until the end of the window period.

[0096] Subsequently, in step S230, the wind turbine blades can be adjusted to a preset anti-vortex position within a window period. Specifically, the wind turbine blades can be adjusted to a first preset anti-vortex position or a second preset anti-vortex position different from the first preset anti-vortex position within the window period. As mentioned above, the first preset anti-vortex position can be an anti-vortex position determined in response to a wind speed less than or equal to a first wind speed threshold, and the second preset anti-vortex position can be an anti-vortex position determined in response to a wind speed greater than the first wind speed threshold. The first wind speed threshold can be a wind speed threshold under extreme wind conditions where the wind speed exceeds the preset threshold.

[0097] Specifically, the pitch system 120 can first disable the anti-vortex blade position comparison fault function, and then adjust the pitch angle of the anti-vortex blade at a preset pitch rate. Generally, the anti-vortex blade position comparison fault function is used to determine whether the blade is at the normal shutdown pitch angle. If the blade is not at the normal shutdown pitch angle, it will be determined that the wind turbine has malfunctioned. In the embodiments of this disclosure, which of the three blades of the wind turbine is selected as the anti-vortex blade can be predetermined. For example, when the wind turbine enters the anti-vortex mode, the main control system 110 can send the information of entering the anti-vortex mode to the pitch system 120, or a fixed blade (e.g., blade #1) can always be selected as the anti-vortex blade for adjustment.

[0098] The pitch system 120 can detect whether the pitch angle of the anti-vortex blades has been adjusted to the preset anti-vortex pitch angle. If not, it can continue to adjust. If the pitch angle of the anti-vortex blades has been adjusted to the preset anti-vortex pitch angle, and the blades other than the anti-vortex blades are at the normal shutdown pitch angle, it can be determined that the wind turbine blades have reached the preset anti-vortex position (i.e., the first preset anti-vortex position or the second preset anti-vortex position).

[0099] In the embodiments of this disclosure, the preset anti-vortex position can be the 90°-90°-40° (or 70°) position exemplified above, that is, the preset anti-vortex pitch angle is 40° (or 70°), and the normal shutdown pitch angle can be 90°. Here, adjusting the anti-vortex blades to the preset anti-vortex pitch angle can mean adjusting the anti-vortex blades to about 40° (or 70°), but a certain deviation is allowed.

[0100] When the pitch angle of the anti-vortex blade is adjusted to the preset anti-vortex pitch angle, and the pitch angles of the other two blades are at the normal shutdown pitch angle, it can be determined that the wind turbine blades have reached the preset anti-vortex position (e.g., the first preset anti-vortex position or the second preset anti-vortex position).

[0101] In other words, when the anti-vortex mode is the shutdown anti-vortex mode, the planned power outage anti-vortex mode, or the forced anti-vortex mode, the wind turbine is in a shutdown state before anti-vortex operation begins, and the position of all three blades is the shutdown pitch angle (e.g., 90°). In this case, only the pitch angle of the anti-vortex blades needs to be adjusted to the anti-vortex pitch angle (e.g., 40° or 70°) to control the anti-vortex blades to reach the preset anti-vortex position. However, when the anti-vortex mode is the unplanned power outage anti-vortex mode, it means that the wind turbine may have been in operation before the power outage, and the position of the three blades may be at the operating angle (e.g., 0°). In this case, not only must the pitch angle of the anti-vortex blades be adjusted to the anti-vortex pitch angle (e.g., 40° (or 70°)), but the pitch angle of the non-anti-vortex blades must also be adjusted to the normal shutdown pitch angle (e.g., 90°) to make the wind turbine blades reach the preset anti-vortex position.

[0102] In embodiments of this disclosure, after the pitch angle of the anti-vortex blade is adjusted to a preset anti-vortex pitch angle, the pitch system 120 can cut off the pitch driver enable signal for the anti-vortex blade based on the pitch driver enable / cut-off signal sent by the main control system 110. That is, it cuts off the pitch driver enable signal for the pitch driver 113 used to drive the anti-vortex blade, so as to maintain the pitch angle of the anti-vortex blade at the anti-vortex pitch angle. It should be understood that in embodiments of this disclosure, when the pitch system 120 adjusts the blade angle, the pitch system 120 can continuously send information such as the blade angle to the main control system 110, so that the main control system 110 can generate pitch system control signals in real time based on this information. For example, the main control system 110 can determine whether the anti-vortex blade has reached the anti-vortex pitch angle through the blade angle information sent by the pitch system 120, and send a driver cut-off enable signal to the pitch system 120 when the anti-vortex pitch angle is reached.

[0103] Once the wind turbine blades reach the preset anti-vortex position, the pitch drive enable signal is cut off, and (in the case of the control platform) a virtual limit is written, the wind turbine can be confirmed to have completed the anti-vortex operation. At this time, the pitch system 120 can send an anti-vortex completion signal back to the main control system 110.

[0104] Furthermore, the anti-vortex vibration control method according to the embodiments of this disclosure can automatically enter the anti-vortex mode as described above, and can also automatically exit the anti-vortex mode in some cases.

[0105] In embodiments of this disclosure, the pitch system 120 can exit the anti-vortex mode when the wind turbine reaches a preset exit condition. The exit conditions for different anti-vortex modes are listed below.

[0106] Exit conditions for shutdown anti-vortex mode

[0107] If any of the following operating conditions occur, the unit will not enter the shutdown anti-vortex mode after shutdown; if it has already entered the shutdown anti-vortex mode, it must exit the anti-vortex mode:

[0108] a) The unit triggered NA overspeed;

[0109] b) A pitch-related fault is triggered before the unit completes anti-vortex operation;

[0110] c) Before the unit completes vortex suppression, a grid-related fault is triggered (i.e., before the grid is cut off, if the unit has not completed vortex suppression, the unit will retract the pitch to the normal shutdown pitch angle).

[0111] d) After the unit completes anti-vortex operation, the unit speed exceeds the anti-vortex speed threshold (to prevent the impeller from rotating in anti-vortex mode, which would lead to excessive fatigue load).

[0112] e) After the unit completes vortex resistance, the 10-minute average wind speed exceeds the vortex resistance wind speed threshold.

[0113] f) The unit meets the start-up conditions (i.e., before starting the unit, it must first exit the shutdown anti-vortex mode, retract the propeller to the normal shutdown pitch angle, and then start the unit according to the start-up procedure).

[0114] g) The unit is not in a shutdown state (i.e., in shutdown anti-vortex mode, if the maintenance personnel manually adjust the unit to maintenance mode, the unit will exit shutdown anti-vortex mode and retract the propeller to the normal shutdown pitch angle).

[0115] Exit conditions for planned power outage anti-vortex mode

[0116] The unit cannot enter the planned power outage anti-eddy mode when any of the following operating conditions occur; if it has already entered the planned power outage anti-eddy mode, it must exit the anti-eddy mode:

[0117] a) The unit triggered NA overspeed;

[0118] b) A pitch-related fault is triggered before the unit completes anti-vortex operation;

[0119] c) Before the unit completes vortex suppression, a grid-related fault is triggered (i.e., before the grid is cut off, if the unit has not completed vortex suppression, the unit will retract the pitch to the normal shutdown pitch angle).

[0120] d) After the unit completes anti-vortex operation, the unit speed exceeds the anti-vortex speed threshold (to prevent the impeller from rotating in anti-vortex mode, which would lead to excessive fatigue load).

[0121] e) After the unit completes vortex resistance, the 10-minute average wind speed exceeds the vortex resistance wind speed threshold.

[0122] f) The unit is not in a shutdown state (i.e., in shutdown anti-vortex mode, if the maintenance personnel manually adjust the unit to maintenance mode, the unit will exit the shutdown anti-vortex mode and retract the propeller to the normal shutdown pitch angle).

[0123] g) Planned power outage anti-vortex shutdown (this shutdown command requires manual or central control confirmation to take effect).

[0124] Exit conditions for forced anti-vortex mode

[0125] The unit cannot enter forced vortex anti-mode when any of the following operating conditions occur; if it has already entered forced vortex anti-mode, it must exit vortex anti-mode:

[0126] a) A pitch-related fault was triggered before the unit completed anti-vortex operation;

[0127] b) After the unit completes anti-vortex operation, the unit speed exceeds the anti-vortex speed threshold (to prevent the impeller from rotating in anti-vortex mode, which would lead to excessive fatigue load).

[0128] c) After the unit completes vortex resistance, the 10-minute average wind speed exceeds the vortex resistance wind speed threshold.

[0129] d) Impeller locking (i.e., after this operation is triggered, it is determined that there is a possibility that maintenance personnel may enter the hub. At this time, the blades must be retracted to the normal stopping pitch angle first);

[0130] e) Safety door opening (i.e., after this operation is triggered, it is determined that there is a possibility that maintenance personnel may enter the hub. At this time, the blades must be retracted to the normal stopping pitch angle first);

[0131] f) Forced anti-vortex shutdown (this shutdown command requires manual confirmation to take effect).

[0132] The exit conditions for the unplanned power outage anti-vortex mode are the same as those for the aforementioned anti-vortex modes, and will not be repeated here.

[0133] In the embodiments of this disclosure, when the main control system 110 detects that one of the above-mentioned exit conditions is met, the main control system 110 may send an exit anti-vortex signal to the pitch system 120. When the pitch system 120 receives the exit anti-vortex signal from the main control system 110, it may perform an anti-vortex operation, trigger a window period (the window period triggered at this time is the same length as the window period used when entering the anti-vortex mode) and restore the pitch driver enable signal of the anti-vortex blades. Then, within the window period, the wind turbine blades are adjusted to the shutdown position, and after the window period ends, the anti-vortex blade position comparison fault function is activated so that the pitch system 120 can normally perform the blade position comparison function.

[0134] In addition, when the pitch system 120 detects that one of the above exit conditions is met, for example, when the pitch system 120 detects a pitch-related fault in anti-vortex mode, the pitch system 120 can restore the pitch driver enable signal of the anti-vortex blade and enable the anti-vortex blade position comparison fault function, thereby causing the blade to automatically return to the normal stopping pitch angle.

[0135] When the dual anti-vortex position is not enabled, the unit's default anti-vortex position is the first preset anti-vortex position (anti-vortex position 1, 90°-90°-40°). When the second preset anti-vortex position is forcibly selected, the target anti-vortex position is the value of the second preset anti-vortex position (anti-vortex position 2, 90°-90°-70°). When the second preset anti-vortex position is not forcibly selected, and the dual anti-vortex function is enabled, the target anti-vortex position is the second preset anti-vortex position when the 10-minute average wind speed exceeds the first wind speed threshold and all three blades are in the off position. In other words, when switching anti-vortex positions, it can be determined whether to forcibly select a certain anti-vortex position before making the selection.

[0136] Figure 6 This is a flowchart illustrating the process of selecting the anti-vortex target position pitch angle according to an embodiment of the present disclosure.

[0137] In step S1510, the current target position is determined as anti-vortex position 1.

[0138] In step S1520, it is determined whether to force the selection of anti-vortex position 2. If the selection of anti-vortex position 2 is forced, then step S1560 is executed to select anti-vortex position 2.

[0139] If anti-vortex position 2 is not forcibly selected, then in step S1530, it is determined whether to enable dual anti-vortex.

[0140] If dual anti-vortex enable is activated, then in step S1540, it is further determined whether the wind speed exceeds the wind speed threshold (first wind speed threshold).

[0141] If dual anti-vortex enable is not enabled, return to step S1510.

[0142] If the wind speed exceeds the wind speed threshold (first wind speed threshold), then in step S1550, it is determined whether the three blades are in the maximum stop position.

[0143] If all three blades are in the maximum shutdown position, then in step S1560, the anti-vortex position 2 is selected.

[0144] If the three blades are not in the maximum shutdown position, the current target position is determined as anti-vortex position 1. That is to say, the anti-vortex position can be switched after the three blades of the wind turbine are in a state of 90°-90°-90°.

[0145] The switching from anti-vortex position 2 to anti-vortex position 1 is similar and will not be described in detail here. Hysteresis control can be implemented when switching from anti-vortex position 2 to anti-vortex position 1. For example, the switching can be performed when the wind speed is significantly lower than a first wind speed threshold, such as when the difference between the wind speed and the first wind speed threshold is greater than or equal to a preset threshold that is not zero (e.g., 3 m / s).

[0146] Figure 7 An example flowchart illustrating the anti-vortex process of a master control system according to an embodiment of the present disclosure is shown.

[0147] Since the unplanned power outage anti-vortex mode is completed independently by the pitch system 120, therefore Figure 7 The flowcharts are only for shutdown anti-vortex mode, planned power outage anti-vortex mode, and forced anti-vortex mode.

[0148] like Figure 7As shown, in step 301, the main control system 110 can determine whether the wind turbine has entered anti-vortex mode. When the wind turbine enters anti-vortex mode, in step 302, the main control system 110 can send an anti-vortex activation signal (e.g., a 2-second pulse) to the pitch system 120. Then, in step 303, the main control system 110 can determine whether it has received an anti-vortex mode activation feedback signal from the pitch system 120. After receiving the anti-vortex mode activation feedback signal, in step S304, the main control system 110 can disable the anti-vortex blade position comparison fault function, detect the blade pitch angle of the anti-vortex blade, and determine whether it is greater than the anti-vortex pitch angle. When the blade pitch angle of the anti-vortex blade is greater than the anti-vortex pitch angle (S304 - Yes), the main control system 110 can determine that the blade pitch angle of the anti-vortex blade needs to be adjusted, and control the pitch system 120 to adjust the anti-vortex blade at a preset pitch rate (e.g., 2 deg / s) (step S305). Then, it continuously detects whether the blade pitch angle of the anti-vortex blade is greater than the anti-vortex pitch angle (step S306), and returns to the previous step to continue adjustment if it is greater than the anti-vortex pitch angle (step S306 - No). Conversely, when the blade pitch angle of the anti-vortex blade is not greater than the anti-vortex pitch angle (step S304 - No, step S306 - Yes), the main control system 110 can determine whether the blade pitch angle of the anti-vortex blade is greater than (anti-vortex pitch angle - 2°). Here, 2° is just an example, and it can be adjusted according to the actual situation in specific implementation. When the blade pitch angle of the anti-vortex blade is not greater than (anti-vortex pitch angle - 2°) (step S307 - No), it indicates that the actual anti-vortex angle has exceeded the limit, so anti-vortex is required to be withdrawn (step S309). When the blade pitch angle of the anti-vortex blade is greater than (anti-vortex pitch angle - 2°) (step S307 - Yes), it indicates that the anti-vortex angle is normal, so pitch can be stopped, and a driver cut-off enable signal is sent to the pitch system 120 (step 308) to cut off the pitch driver enable of the pitch system 120. Then it is determined whether the anti-vortex function completion feedback sent by the pitch system 120 is received (step 310). If the feedback is received, it indicates that the anti-vortex function has been completed on the pitch system 120 side.

[0149] Figure 8 An example flowchart illustrating the desiccation process of a master control system according to an embodiment of the present disclosure is shown.

[0150] like Figure 8As shown, in step 401, the main control system 110 can determine whether the wind turbine has exited the anti-vortex mode (e.g., exiting the anti-vortex mode based on whether one of the preset exit conditions is met). When it is determined that the wind turbine has exited the anti-vortex mode, in step 402, the main control system 110 can send an anti-vortex function exit signal (e.g., a 2-second pulse) to the pitch system 120. Then, in step 403, the main control system 110 can determine whether the anti-vortex mode activation feedback received from the pitch system 120 is TRUE. If the anti-vortex mode activation feedback is TRUE (S403 - Yes), then continue to wait. If the anti-vortex mode activation feedback is FALSE (S403 - No), then in step S404, the main control system 110 detects the blade pitch angle of the anti-vortex blades and determines whether it is less than the normal shutdown pitch angle. When the blade pitch angle of the anti-vortex blade is less than the normal shutdown pitch angle (S404 - Yes), the main control system 110 determines that the blade pitch angle needs to be adjusted. In step S405, it controls the pitch system 120 to adjust the anti-vortex blade towards the normal shutdown pitch angle at a preset pitch rate (e.g., 2 degrees / s). Then, in step S406, it continuously detects whether the blade pitch angle of the anti-vortex blade is greater than or equal to (normal shutdown pitch angle - 2°) and has been maintained for a period of time (e.g., 5 seconds). Here, 2° is just an example, and it can be adjusted according to the actual situation in specific implementation. When the blade pitch angle of the anti-vortex blade is greater than or equal to (normal shutdown pitch angle - 2°) and has been maintained for a period of time (step S406 - Yes), the pitch can be stopped and the anti-vortex blade position comparison fault function can be activated (step 407). Furthermore, when it is determined in step S404 that the blade pitch angle of the anti-vortex blade is not less than the anti-vortex pitch angle (S404-No), the main control system 110 can perform the comparison in step S406 and execute subsequent operations.

[0151] Figure 9 An example flowchart illustrating the anti-vortex process of a pitch system 120 according to an embodiment of the present disclosure is shown. Figure 9 The flowcharts are only for shutdown anti-vortex mode, planned power outage anti-vortex mode, and forced anti-vortex mode.

[0152] like Figure 9As shown, in step 501, the pitch system 120 can receive an anti-vortex function activation signal sent by the main control system 110. Additionally, although not shown, before receiving the anti-vortex function activation signal, a dual anti-vortex switching signal can be identified (e.g., a dual anti-vortex switching signal (control signal) switching from a first preset anti-vortex position to a second preset anti-vortex position, or a dual anti-vortex switching signal (control signal) switching from a second preset anti-vortex position to a first preset anti-vortex position). The dual anti-vortex switching signal can be provided by the main control system and can be determined by the main control system based on factors such as wind speed (e.g., 90°-90°-40° or 90°-90°-70°). After determining that the wind turbine blades are in a 90°-90°-90° state, the pitch system 120 can identify the dual anti-vortex switching signal sent by the main control system and determine whether the target anti-vortex position is the first preset anti-vortex position or the second preset anti-vortex position. Then, step 502 enters the anti-vortex mode, and step 503 triggers the window period. Next, in step 504, it can be determined whether the current period is still within the window period. If so (step 504 - Yes), then in step 505, an anti-vortex mode activation feedback is sent to the main control system 110. The feedback enters the anti-vortex mode, and in step 506, the anti-vortex blade position comparison fault function is disabled. During this process, the pitch system 120 can continuously send the anti-vortex blade angle to the main control system 110. In step 507, the pitch system 120 can adjust the position of the wind turbine's anti-vortex blades and determine whether the three blades of the wind turbine have reached the preset anti-vortex position (e.g., the first preset anti-vortex position or the second preset anti-vortex position). If (step 507 - Yes), then in step 508, the driver cut-off enable signal is received from the main control system 110. In step 509, the anti-vortex blade is selected (this step is performed on the premise that the main control system 110 sends the determined specific anti-vortex blade information to the pitch system 120; if the anti-vortex blade is a fixed blade, this step is not required). In step 510, the pitch driver enable signal of the anti-vortex blade is cut off (at this time, it can be cut off after further judging that the stopping position of the blade is the same as the preset anti-vortex position (there may be a certain error)). Then, in step 511, the virtual limit of the driver of the anti-vortex blade is set (only performed on the Dan control platform; it can be omitted on other platforms). In step 512, the pitch driver enable signal is written into the power-off retention area. In step 513, the anti-vortex function completion feedback is sent to the main control system 110 to provide feedback that the anti-vortex function is complete, or the anti-vortex position switching completion signal is sent to the main control system. In step 514, the pitch system 120 can further determine whether the blade position deviates from the preset anti-vortex position after the anti-vortex function is completed. If there is no deviation (step 514 - No), it indicates that the anti-vortex function is successful and the process ends. If the blade position deviates from the preset anti-vortex position (step 514 - Yes), then in step 515, it is determined that a pitch trigger fault "blade offset from anti-vortex position after anti-vortex function is completed" has occurred.At this point, the anti-vortex process can be entered. In step 518, the anti-vortex mode is exited. In step 519, the virtual limit of the anti-vortex blade driver is cleared (this is only performed on the Dan control platform; it can be omitted on other platforms). In step 520, the pitch driver enable signal is restored, and in step 521, the anti-vortex blade position comparison fault function is enabled (i.e., the shielding is removed). At this point, since the anti-vortex blade position comparison fault function has been enabled, the wind turbine blades can be automatically adjusted to the stop pitch angle under the control of this function.

[0153] Furthermore, if it is determined in step 504 that the current window period is not yet open (step 504 - No), the pitch system can automatically determine in step 516 whether anti-vortex or anti-vortex switching is complete. If complete (step 516 - Yes), the current process ends. If not complete (step 516 - No), a pitch trigger fault "anti-vortex timeout" is determined in step 517, and the process proceeds to step 518 for the subsequent vortex de-escalation process.

[0154] Figure 10 An example flowchart illustrating the anti-vortex process of an atmospheric pressure pitch system according to an embodiment of the present disclosure is shown. Figure 10 The flowchart is only for the unplanned power outage anti-vortex mode.

[0155] like Figure 10As shown, when an unplanned power outage occurs, in step 601, the pitch system 120 can determine whether a resolver failure or jamming has occurred. If a resolver failure or jamming occurs (step S601 - Yes), the current process exits because anti-vortex operation cannot be performed. If no resolver failure or jamming occurs (step S601 - No), in step 602, it can be determined whether the pitch angle of the anti-vortex blades is less than the anti-vortex pitch angle. If the pitch angle of the anti-vortex blades is greater than the anti-vortex pitch angle (step S602 - No), as mentioned above, in this case, due to the unit's safety chain protection function, the anti-vortex blades cannot be opened to a small angle, and therefore the current process exits. If the pitch angle of the anti-vortex blades is less than the anti-vortex pitch angle (step S602 - Yes), in step 603, the pitch system can enter anti-vortex mode, and in step 604, the trigger window period is activated. Next, in step 605, it can be determined whether the current period is still within the window period. If it is within the window period (step 605 - Yes), then in step 606, an anti-vortex mode activation feedback is sent to the main control system 110. The feedback enters the anti-vortex mode, and in step 607, the anti-vortex blades are selected and the anti-vortex blade position comparison fault function is disabled. In step 608, the pitch system 120 can adjust the position of the wind turbine's anti-vortex blades and determine whether the pitch angle of the anti-vortex blades reaches the anti-vortex pitch angle (e.g., 40° or 70°). If yes (step 608 - Yes), then in step 609, the pitch system 120 cuts off the pitch driver enable signal (to ensure that the blades can stop within, for example, the range of (40 (or 70) ± 1)°, the operation of cutting off the enable signal can begin at 39° or 60°). Then, in step 610, it is determined whether the pitch angle of the non-vortex-resistant blades has reached the shutdown pitch angle. If it has not reached the shutdown pitch angle (step 610 - No), the process returns to step 610 to continue adjusting the pitch angle of the non-vortex-resistant blades. If the pitch angle of the non-vortex-resistant blades has reached the shutdown pitch angle (step 610 - Yes), then in step 611, feedback indicating completion of the vortex-resistant function can be sent to the main control system 110, indicating completion of vortex-resistant operation. In step 612, the pitch driver enable signal is written to the power-down retention area (the order of steps 611 and 612 can also be interchanged). Steps 613 to 619 are related to... Figure 5 Steps 515 to 521 are similar, so they will not be explained in detail.

[0156] Figure 11 An example flowchart illustrating the vortex-repelling process of an atmospheric pressure pitch system according to an embodiment of the present disclosure is shown. In an embodiment of the present disclosure, the process is initiated and controlled by a master control system 110, which can send a vortex-repelling exit signal to the pitch system 120 to cause the pitch system 120 to exit the vortex-repelling mode.

[0157] In embodiments of this disclosure, when the anti-vortex mode exit conditions described above are met, the main control system 110 may send an exit anti-vortex signal.

[0158] Reference Figure 11 In step 701, the pitch system 120 receives the anti-vortex exit signal sent by the main control system 110, then exits the anti-vortex mode in step 702 and triggers the window period in step 703. Afterwards, in step 704, the virtual limit switch of the anti-vortex blade's drive is cleared (this step is only performed on the main control platform and may not be performed on other platforms). In step 705, the pitch drive enable signal of the anti-vortex blade is restored. Then, in step 706, under the control of the main control system 110, the blade is pitched from the anti-vortex position (90°-90°-40° or 90°-90°-70°) to the normal stop position (90°-90°-90°). Afterwards, in step 707, it can be determined whether the window period has ended. If it has not ended (step 706 - No), the process continues to wait. If the window period has ended (step 707 - Yes), in step 708, the pitch system 120 can cancel the blade position comparison fault function (i.e., activate the blade position comparison fault function) to allow the blade to resume normal operation.

[0159] Reference above Figures 9 to 11 The anti-vortex and de-vortex processes of the atmospheric pressure pitch system are described. However, it should be understood that since the low-pressure pitch system does not use a control platform, the anti-vortex and de-vortex processes of the low-pressure pitch system do not include steps related to the virtual limit of the actuator. Furthermore, in the low-pressure pitch system, under the unplanned power outage anti-vortex mode, if a communication failure occurs between the main control and pitch systems after a power outage of the transformer substation, the anti-vortex module will not be entered, and the other steps are similar to those of the atmospheric pressure pitch system. Therefore, for the sake of simplicity, they will not be described in detail here.

[0160] Figure 12 A block diagram of an anti-vortex-induced vibration control device for a wind turbine according to an embodiment of the present disclosure is shown.

[0161] Reference Figure 12 According to an exemplary embodiment of the present disclosure, the anti-vortex-induced vibration control device 800 may include an anti-vortex mode confirmation module 810, an anti-vortex triggering module 820, and an anti-vortex execution module 830.

[0162] In embodiments of this disclosure, the anti-vortex mode confirmation module 810 can be configured to determine whether the wind turbine has entered an anti-vortex mode. Here, the anti-vortex mode may include a shutdown anti-vortex mode, a planned power outage anti-vortex mode, an unplanned power outage anti-vortex mode, and a forced anti-vortex mode. The anti-vortex mode confirmation module 810 can determine whether an anti-vortex activation signal is received from the wind turbine's main control system or whether a first preset condition for the unplanned power outage anti-vortex mode is met, and in response to receiving the anti-vortex activation signal from the main control system or meeting the first preset condition for the unplanned power outage anti-vortex mode, it determines that the wind turbine has entered an anti-vortex mode. Here, the anti-vortex activation signal is sent by the main control system when a second preset condition for the shutdown anti-vortex mode, a third preset condition for the planned power outage anti-vortex mode, or a fourth preset condition for the forced anti-vortex mode is met.

[0163] The anti-vortex trigger module 820 can respond to the wind turbine entering anti-vortex mode, activate the anti-vortex function and trigger the window period.

[0164] In embodiments of this disclosure, the first preset condition may include: an unplanned power outage of the wind turbine, and the blade pitch angle of the wind turbine at the time of the power outage is less than the anti-vortex pitch angle. The second preset condition may include: the wind turbine is in a shutdown state and the shutdown anti-vortex function is activated. The third preset condition may include: the wind turbine is in a shutdown state and the planned power outage anti-vortex function is activated. The fourth preset condition may include: the wind turbine is in a shutdown or maintenance state and the forced anti-vortex function is activated.

[0165] In embodiments of this disclosure, the length of the window period is determined based on a preset pitch rate and a preset compensation time for the pitch drive of the wind turbine.

[0166] The anti-vortex execution module 830 can adjust the wind turbine blades to a first preset anti-vortex position or a second preset anti-vortex position different from the first preset anti-vortex position within a window period. The window period can indicate the minimum time required to complete the anti-vortex function. In the dual anti-vortex scheme, the window period can indicate the minimum time required to switch from the first preset anti-vortex position to the second preset anti-vortex position to complete the anti-vortex function. Here, the first preset anti-vortex position is the anti-vortex position determined in response to a wind speed less than or equal to a first wind speed threshold, and the second preset anti-vortex position is the anti-vortex position determined in response to a wind speed greater than the first wind speed threshold. The first wind speed threshold can be as described above, and will not be repeated here.

[0167] In the embodiments of this disclosure, when adjusting the blades of the wind turbine to a preset anti-vortex position, the anti-vortex execution module 830 can disable the anti-vortex blade position comparison fault function, adjust the pitch angle of the anti-vortex blade at a preset pitch rate, determine whether the pitch angle of the anti-vortex blade has been adjusted to the preset anti-vortex pitch angle, and in response to the anti-vortex blade pitch angle being adjusted to the preset anti-vortex pitch angle and other blades except the anti-vortex blade being at the normal shutdown pitch angle, determine that the blades of the wind turbine have reached the preset anti-vortex position.

[0168] In the embodiments of this disclosure, after the pitch angle of the anti-vortex blade is adjusted to the preset anti-vortex pitch angle, the anti-vortex execution module 830 can also cut off the pitch driver enable signal of the anti-vortex blade based on the pitch driver enable cut-off signal sent by the wind turbine's main control system to maintain the pitch angle of the anti-vortex blade.

[0169] In embodiments of this disclosure, the anti-vortex vibration control device 800 may further include a devortex execution module (not shown) for exiting the anti-vortex mode in response to the fan reaching a preset exit condition.

[0170] In embodiments of this disclosure, when a vortex-resistant exit signal is received from the wind turbine's main control system, the vortex-resistant execution module (not shown) can restore the pitch driver enable signal for the vortex-resistant blades and trigger a window period. During the window period, the wind turbine blades are adjusted to the shutdown position, and the vortex-resistant blade position comparison fault function is activated. Here, the vortex-resistant exit signal is sent by the main control system when it detects the exit condition. Furthermore, when a pitch-type fault is detected in vortex-resistant mode, the vortex-resistant execution module (not shown) can restore the pitch driver enable signal for the vortex-resistant blades and activate the vortex-resistant blade position comparison fault function.

[0171] The anti-vortex-induced vibration control method and system for wind turbines according to embodiments of this disclosure can be applied to various application scenarios, such as before the wind turbine is powered on, when the wind turbine is in operation, during grid power outages, during unit maintenance, when anti-vortex control is deactivated, and during extreme wind conditions. Tables 1 to 5 below illustrate some specific examples of these application scenarios, corresponding operating conditions, shutdown angles after implementing the anti-vortex-induced vibration control scheme of this disclosure (i.e., the angle of the blades after implementing the anti-vortex-induced vibration control scheme of this disclosure), and execution schemes.

[0172] Table 1 Application Scenarios Before Powering On the Fan

[0173]

[0174]

[0175] Table 2 Application Scenarios Where the Fan is in Operation

[0176]

[0177] Table 3 Application Scenarios During Power Outages

[0178]

[0179]

[0180] Table 4 Application Scenarios During Unit Maintenance

[0181]

[0182] Table 5 Application scenarios when disengaging from anti-vortex system

[0183]

[0184]

[0185] The above has been referred to Figures 1 to 12 A method and system for controlling vortex-induced vibration of a wind turbine according to exemplary embodiments of the present disclosure are described. However, it should be understood that the apparatus and systems shown in the figures can be configured as software, hardware, firmware, or any combination thereof to perform specific functions. For example, these systems and apparatuses may correspond to dedicated integrated circuits, pure software code, or modules combining software and hardware. Furthermore, one or more functions implemented by these systems or apparatuses may also be uniformly executed by components in a physical entity device (e.g., a processor, client, or server).

[0186] For example, according to an exemplary embodiment of the present disclosure, a computer-readable storage medium storing instructions may be provided, wherein when the instructions are executed by at least one computing device, the at least one computing device causes the at least one computing device to perform at least one of the steps described above.

[0187] The instructions stored in the aforementioned computer-readable storage medium can be executed in environments deployed in computer devices such as clients, hosts, agent devices, and servers. It should be noted that the instructions can also be used to perform additional steps beyond those described above, or to perform more specific processing while executing the aforementioned steps. The details of these additional steps and further processing are already provided in the reference... Figures 1 to 12 As mentioned in the description of the relevant systems and methods, they will not be repeated here to avoid repetition.

[0188] It should be noted that the anti-vortex-induced vibration control system and method for wind turbines according to the exemplary embodiments of this disclosure can rely entirely on the operation of computer programs or instructions to achieve the corresponding functions. That is, each device corresponds to each step in the functional architecture of the computer program, so that the entire system is called through a special software package (e.g., a lib library) to achieve the corresponding functions.

[0189] On the other hand, when Figure 12When the system and apparatus shown are implemented as software, firmware, middleware or microcode, the program code or code segment for performing the corresponding operation can be stored in a computer-readable medium such as a storage medium, so that at least one processor or at least one computing device can perform the corresponding operation by reading and running the corresponding program code or code segment. In addition, the computer-readable medium or storage medium can cause the processor to perform the above-described anti-vortex-induced vibration control method when the computer program is executed by the processor.

[0190] For example, according to an exemplary embodiment of the present disclosure, a computer device may be provided including a readable medium storing computer program instructions, wherein the instructions, when executed by at least one computing device, cause the at least one computing device to perform at least one of the above steps.

[0191] In addition, this disclosure may provide an electronic device, which may include: a processor; a memory storing a computer program, which, when executed by the processor, causes the processor to perform the above-described anti-vortex-induced vibration control method.

[0192] This disclosure may also provide an anti-vortex-induced vibration control system for wind turbines, which may include a main control system performing at least one of the above steps and a pitch system performing at least one of the above steps.

[0193] By applying the anti-vortex-induced vibration control method, apparatus and system for wind turbines according to embodiments of the present disclosure, vortex-induced vibration under extreme wind conditions can be addressed.

[0194] Furthermore, by applying the anti-vortex-induced vibration control method, apparatus, and system for wind turbines according to embodiments of this disclosure, the workload of maintenance personnel can be reduced, the fatigue load on the wind turbine can be reduced, or economic losses can be reduced.

[0195] The anti-vortex vibration control method, apparatus, and system for wind turbines according to embodiments of this disclosure do not conflict with the existing safety chain design of wind turbines; even after the safety chain breaks, the blades still feather backward. Therefore, it is possible to ensure that the blades stop in the anti-vortex position without modifying the safety chain control logic or shielding the safety chain fault.

Claims

1. A vortex-induced vibration control method for a wind turbine, characterized by, The anti-vortex vibration control method comprises: determining a wind speed of a location where the wind turbine is located; in response to the wind speed being less than or equal to a first wind speed threshold, determining an anti-vortex position of the blades of the wind turbine to be a first preset anti-vortex position and sending a first control instruction for pitching the blades to the first preset anti-vortex position to a pitch system, the first wind speed threshold being a wind speed threshold in an extreme wind condition where the wind speed exceeds a threshold value; in response to the wind speed being greater than the first wind speed threshold, determining the anti-vortex position of the blades of the wind turbine to be a second preset anti-vortex position different from the first preset anti-vortex position and sending a second control instruction for pitching the blades to the second preset anti-vortex position to the pitch system.

2. The vortex-induced vibration suppressing control method for a wind turbine according to claim 1, wherein The anti-vortex vibration control method further comprises: in response to the blades being pitched to the first preset anti-vortex position and the wind speed becoming greater than the first wind speed threshold, sending the second control instruction for pitching the blades to the second preset anti-vortex position to the pitch system.

3. The vortex-induced vibration suppressing control method for a fan according to claim 2, wherein The step of sending the second control instruction for pitching the blades to the second preset anti-vortex position to the pitch system in response to the blades being pitched to the first preset anti-vortex position and the wind speed becoming greater than the first wind speed threshold comprises: in response to the blades being pitched to the first preset anti-vortex position and the wind speed becoming greater than the first wind speed threshold, exiting the anti-vortex mode; in response to the blades being pitched to a maximum pitch angle, re-entering the anti-vortex mode and sending the second control instruction for pitching the blades to the second preset anti-vortex position to the pitch system.

4. The vortex-induced vibration suppressing control method for a fan according to claim 1, characterized by, The anti-vortex vibration control method further comprises: in response to the blades being pitched to the second preset anti-vortex position and the wind speed becoming less than or equal to the first wind speed threshold and lasting for a first preset time, sending the first control instruction for pitching the blades to the first preset anti-vortex position to the pitch system.

5. The anti-vortex vibration control method for a wind turbine according to claim 4, wherein The step of sending the first control instruction for pitching the blades to the first preset anti-vortex position to the pitch system in response to the blades being pitched to the second preset anti-vortex position and the wind speed becoming less than or equal to the first wind speed threshold and lasting for a first preset time comprises: in response to the blades being pitched to the second preset anti-vortex position and the wind speed becoming less than or equal to the first wind speed threshold and lasting for a first preset time, exiting the anti-vortex mode; in response to the blades being pitched to a maximum pitch angle, re-entering the anti-vortex mode and sending the first control instruction for pitching the blades to the first preset anti-vortex position to the pitch system.

6. The vortex-induced vibration suppressing control method for a fan according to any one of claims 1 to 5, characterized by, The minimum pitch angle of the blades in the first preset anti-vortex position is less than the minimum pitch angle of the blades in the second preset anti-vortex position.

7. The vortex-induced vibration suppressing control method for a fan according to claim 6, wherein The minimum pitch angle of the blades in the first preset anti-vortex position is in a range of 30 degrees to 50 degrees, the minimum pitch angle of the blades in the second preset anti-vortex position is in a range of 60 degrees to 80 degrees, and the first wind speed threshold is greater than or equal to 28 m / s, the wind speed being an average wind speed in a predetermined time period.

8. A vortex-induced vibration control method for a wind turbine, characterized by, comprises: determining whether the wind turbine enters an anti-vortex mode; in response to the wind turbine entering the anti-vortex mode, starting an anti-vortex function and triggering a window period; adjusting the blades of the wind turbine to a first preset anti-vortex position or a second preset anti-vortex position different from the first preset anti-vortex position within the window period, the window period indicating a minimum time required for completing the anti-vortex function, wherein the first preset anti-vortex position is an anti-vortex position determined in response to a wind speed being less than or equal to a first wind speed threshold, and the second preset anti-vortex position is an anti-vortex position determined in response to the wind speed being greater than the first wind speed threshold, and the first wind speed threshold is a wind speed threshold in an extreme wind condition in which the wind speed exceeds a preset threshold.

9. The vortex-induced vibration suppressing control method for a fan according to claim 8, wherein the anti-vortex mode includes a shutdown anti-vortex mode, a planned outage anti-vortex mode, an unplanned outage anti-vortex mode, and a forced anti-vortex mode, wherein the step of determining whether the wind turbine enters the anti-vortex mode includes: determining whether an anti-vortex start signal is received from a main control system of the wind turbine or whether a first preset condition for the unplanned outage anti-vortex mode is met, wherein the anti-vortex start signal is sent by the main control system when a second preset condition for the shutdown anti-vortex mode, a third preset condition for the planned outage anti-vortex mode, or a fourth preset condition for the forced anti-vortex mode is met; in response to receiving the anti-vortex start signal from the main control system or meeting the first preset condition for the unplanned outage anti-vortex mode, determining that the wind turbine enters the anti-vortex mode.

10. The anti-vortex vibration control method for a wind turbine according to claim 9, wherein the first preset condition includes that the wind turbine is in an unplanned outage and a pitch angle of the blades of the wind turbine when the outage is less than an anti-vortex pitch angle; the second preset condition includes that the wind turbine is in a shutdown state and a shutdown anti-vortex function is started; the third preset condition includes that the wind turbine is in a shutdown state and a planned outage anti-vortex is started; the fourth preset condition includes that the wind turbine is in a shutdown or maintenance state and a forced anti-vortex function is started.

11. The vortex-induced vibration resistant control method for a wind turbine according to claim 8, wherein, a length of the window period is determined based on a preset pitch rate and a compensation time preset for a pitch drive of the wind turbine.

12. The vortex-induced vibration suppression control method for a wind turbine according to claim 11, wherein, the step of adjusting the blades of the wind turbine to the first preset anti-vortex position or the second preset anti-vortex position within the window period includes: shielding an anti-vortex blade position comparison fault function; adjusting a pitch angle of the anti-vortex blade at the preset pitch rate; determining whether the pitch angle of the anti-vortex blade is adjusted to a preset anti-vortex pitch angle; in response to the pitch angle of the anti-vortex blade being adjusted to the preset anti-vortex pitch angle and other blades except the anti-vortex blade being at a normal shutdown pitch angle, determining that the blades of the wind turbine reach the first preset anti-vortex position or the second preset anti-vortex position.

13. The vortex-induced vibration suppression control method for a wind turbine according to claim 12, wherein, after the pitch angle of the anti-vortex blade is adjusted to the preset anti-vortex pitch angle, the anti-vortex vibration control method further includes: based on a pitch drive enable cut-off signal sent by the main control system of the wind turbine, cutting off a pitch drive enable signal of the anti-vortex blade to maintain the pitch angle of the anti-vortex blade.

14. The vortex-induced vibration suppressing control method for a fan according to claim 13, wherein the anti-vortex vibration control method further includes: in response to the wind turbine reaching a preset exit condition, exiting the anti-vortex mode.

15. The vortex-induced vibration resistant control method for a wind turbine according to claim 14, wherein, The step of exiting the anti-vortex mode comprises: triggering a window period and restoring the pitch drive enable signal of the anti-vortex blade when receiving an exit anti-vortex signal from a master control system of the wind turbine, adjusting the blades of the wind turbine to a shutdown position within the window period, and starting an anti-vortex blade position comparison fault function after the end of the window period, wherein the exit anti-vortex signal is sent by the master control system when detecting an exit condition, restoring the pitch drive enable signal of the anti-vortex blade and starting the anti-vortex blade position comparison fault function when detecting a pitch fault in the anti-vortex mode.

16. A vortex-induced vibration resistant controller for a wind turbine, characterized by The anti-vortex vibration controller comprises: an anti-vortex mode confirmation module configured to determine whether the wind turbine enters an anti-vortex mode; an anti-vortex triggering module configured to start an anti-vortex function and trigger a window period in response to the wind turbine entering the anti-vortex mode; an anti-vortex execution module configured to adjust the blades of the wind turbine to a first preset anti-vortex position or a second preset anti-vortex position different from the first preset anti-vortex position within the window period, the window period indicating a minimum time required to complete the anti-vortex function, wherein the first preset anti-vortex position is an anti-vortex position determined in response to a wind speed being less than or equal to a first wind speed threshold, and the second preset anti-vortex position is an anti-vortex position determined in response to the wind speed being greater than the first wind speed threshold, and the first wind speed threshold is a wind speed threshold in an extreme wind condition where the wind speed exceeds a preset threshold.

17. A vortex-induced vibration control system for a wind turbine, characterized by, The control system comprises: a master control system configured to perform the anti-vortex vibration control method according to any one of claims 1 to 7; and a pitch system configured to perform the anti-vortex vibration control method according to any one of claims 8 to 15.

18. A computer readable storage medium storing a computer program, characterized in that, The computer program, when executed by a processor, causes the processor to perform the anti-vortex vibration control method according to any one of claims 1 to 7 or perform the anti-vortex vibration control method according to any one of claims 8 to 15.

19. An electronic device, comprising: The electronic device comprises: a processor; a memory storing a computer program, which, when executed by the processor, causes the processor to perform the anti-vortex vibration control method according to any one of claims 1 to 7 or perform the anti-vortex vibration control method according to any one of claims 8 to 15.

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