Vortex-induced vibration control method, device and system for fan

Abstract

The invention provides a vortex-induced vibration control method, device and system for a fan. The anti-vortex-induced vibration control method comprises the steps that the wind speed of the position where the draught fan is located is determined; in response to the fact that the wind speed is smaller than or equal to a first wind speed threshold value, determining that the anti-vortex position of a blade of the draught fan is a first preset anti-vortex position, and sending a first control instruction for enabling the blade to be subjected to variable pitch to the first preset anti-vortex position to a variable pitch system, the first wind speed threshold value is a wind speed threshold value under the extreme wind condition that the wind speed exceeds a threshold value; and in response to the fact that the wind speed is larger than the first wind speed threshold value, it is determined that the anti-vortex position of the blade of the draught fan is a second preset anti-vortex position different from the first preset anti-vortex position, and a second control instruction used for enabling the blade to be subjected to variable pitch to the second preset anti-vortex position is sent to the variable pitch system. By means of the vortex-induced vibration resisting control method, vortex-induced vibration of the draught fan under the extreme wind condition can be reduced.

Description

Technical Field

[0001] The present application relates to the field of wind power, and more specifically, to a method, device and system for controlling vortex-induced vibration of a wind turbine generator set. Background Art

[0002] When the wind flows over the surface of a slender cylinder (for example, a tower), pairs of antisymmetric vortices will break away downstream due to the instability of the boundary layer. The generation and release of vortices are directly related to the periodic changes in the excitation of the tower surface. When the excitation frequency (fs) is close to the natural frequency (f) of the tower, the tower vibration is amplified, and the vibration simultaneously reversely affects the flow field, intensifies the excitation, and forms a large amplitude vibration. This fluid-structure coupling phenomenon is called vortex-induced vibration.

[0003] When a wind turbine (abbreviated as wind turbine, unit or wind turbine, etc.) is shut down, if the three blades of the wind turbine are all stopped at about 90° (feathered state), it is easier to cause vortex-induced vibration. However, if one of the blades is stopped at 40°, the probability of vortex-induced vibration can be greatly reduced.

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

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

[0006] According to a first aspect of the present 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 blades of the wind turbine to be a first preset anti-vortex position and sending a first control instruction to a pitch system for pitching the blades to the first preset anti-vortex position, the first wind speed threshold being a wind speed threshold under extreme wind conditions where the wind speed exceeds a threshold; 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 to the pitch system for pitching the blades to the second preset anti-vortex position.

[0007] According to a second aspect of the present disclosure, a method for controlling anti-vortex-induced vibration of a wind turbine includes: determining whether the wind turbine enters an anti-vortex mode; in response to the wind turbine entering an anti-vortex mode, turning on 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 during the window period, the window period indicating 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 being 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 being greater than a first wind speed threshold, and the first wind speed threshold is a wind speed threshold under extreme wind conditions where the wind speed exceeds a preset threshold.

[0008] According to a third aspect of the present disclosure, an anti-vortex-induced vibration controller for a wind turbine may include: an anti-vortex mode confirmation module, configured to determine whether the wind turbine enters the anti-vortex mode; an anti-vortex triggering module, configured to turn on the 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 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 a 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 the present disclosure, an anti-vortex-induced vibration control system for a wind turbine includes: a main control system configured to execute the above-mentioned anti-vortex-induced vibration control method; and a pitch system configured to execute the above-mentioned anti-vortex-induced vibration control method.

[0010] According to a fifth aspect of the present disclosure, a computer-readable storage medium storing a computer program, when the computer program is executed by a processor, prompts the processor to execute the above-mentioned anti-vortex-induced vibration control method or execute the above-mentioned anti-vortex-induced vibration control method.

[0011] According to a sixth aspect of the present disclosure, an electronic device includes: a processor; a memory storing a computer program, which, when executed by the processor, prompts the processor to execute the above-mentioned anti-vortex-induced vibration control method or execute the above-mentioned anti-vortex-induced vibration control method.

[0012] By applying the anti-vortex-induced vibration control method, device and system for a wind turbine according to the embodiments of the present disclosure, it is possible to cope with vortex-induced vibrations under extreme wind conditions, reduce the workload of maintenance personnel, and reduce economic losses. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0014] Figure 2 is a flow chart showing an anti-vortex-induced vibration control method for a wind turbine according to a first embodiment of the present disclosure.

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

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

[0017] Figure 5 is a flow chart showing an anti-vortex-induced vibration control method for a wind turbine according to a second embodiment of the present disclosure.

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

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

[0020] Figure 8 An exemplary flow chart of a devortex process of a main control system according to an embodiment of the present disclosure is shown.

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

[0022] Fig.10 An example flow chart showing an anti-vortex process of a constant pressure pitch system according to an embodiment of the present disclosure is shown.

[0023] Fig.11 An exemplary flow chart showing a de-vortexing process of a constant pressure pitch system according to an embodiment of the present disclosure is shown.

[0024] Fig.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] Hereinafter, the present disclosure will be described in detail with reference to the accompanying drawings, and the same or similar elements will be indicated by the same or similar reference numerals throughout the accompanying drawings. DETAILED DESCRIPTION

[0026] The following detailed description is provided to help gain a comprehensive understanding of the methods, devices and / or systems described herein. However, the order of operations described herein is only an example and is not limited to those orders set forth herein, but may be equivalently replaced or changed except for operations that must occur or be performed in a specific order. In addition, for greater clarity and simplicity, the description of content known in the art will be omitted or simplified.

[0027] Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as those generally understood by a person of ordinary skill in the art to which the present disclosure belongs after understanding the present disclosure. Unless explicitly defined as such herein, terms (such as those defined in a general dictionary) should be interpreted as having a meaning consistent with their meaning in the context of the relevant art and the present disclosure, and should not be interpreted in an idealized or overly formal 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 the previous embodiments may be omitted if they appear again in the subsequent embodiments. In addition, the technical features described in different or the same embodiments may be combined in any manner, as long as the combined embodiments or technical solutions are complete and can solve the technical problems of the present application or achieve the technical effects described or not described in the present disclosure but can be determined based on the above complete technical solutions. The terms used in the present disclosure are explained below.

[0029] Normal parking pitch angle: In the parking state, the parking angles of the three blades are all around 90°, and 90° is the normal parking 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 (hereinafter, 40° and 70° will be used as examples for double anti-vortex description. It should be understood that different anti-vortex pitch angles may be set for different wind turbine models, for example, 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 angle of the blade and the anti-vortex pitch angle is allowed, for example, there may be a deviation of ±0.5° or ±1°).

[0031] Shutdown anti-vortex mode: After the fan enters the shutdown state, the three blades are first retracted to the normal shutdown pitch angle, and then the corresponding anti-vortex blades are automatically opened 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: When the power grid is about to be cut off, the wind turbine is shut down in advance and the wind turbine is prohibited from starting, ensuring that the wind turbine is still in the anti-vortex state after the power grid is cut off, that is, the pitch angle of the wind turbine is maintained at 90°-90°-40° or 90°-90°-70°, which is the planned power outage anti-vortex mode. In addition, in the planned power outage anti-vortex mode, the wind turbine should be aligned with the predicted main wind direction.

[0033] Unplanned power-off anti-vortex mode: When the wind turbine is in the process of starting, generating or shutting down, and the blade pitch angle is less than 40° (or 70°), the wind turbine loses power due to a grid failure or a wind turbine failure. At this time, the wind turbine will enter the unplanned power-off anti-vortex mode. During the emergency stop and retraction of the blades, the anti-vortex blades stop at 40° (or 70°), and the non-anti-vortex blades stop at 90°. In addition, if the pitch angle of the anti-vortex blades is greater than 40° (or 70°) during the unplanned power outage, the blades cannot be opened to a small angle due to the protection function of the wind turbine safety chain. Therefore, the anti-vortex blades cannot reach 40° (or 70°), and the anti-vortex function cannot be achieved. In an exemplary embodiment of the present disclosure, the unplanned power-off anti-vortex function will be independently implemented by the variable pitch system of the wind turbine.

[0034] Forced anti-vortex mode: When the fan is in maintenance mode, or the power grid is off and the fan is powered by an external power supply, the fan is controlled to enter the anti-vortex state by sending a command manually. In the forced anti-vortex mode, the fan should be aligned with the predicted main wind direction.

[0035] In the prior art, pitch systems generally include normal pressure pitch systems and low pressure pitch systems. Normal pressure pitch systems may include, for example, "Dankong platform", "Huichuang platform", etc., and low pressure pitch systems include, for example, "low pressure platform".

[0036] Normal pitch control mode: The pitch control system has no faults and the blade movement is controlled by the wind turbine main control system.

[0037] Pitch failure mode (or emergency stop mode): There is a fault in the pitch system, and the blade movement is controlled by the pitch controller, retracting the blades to the normal parking pitch angle at a preset speed (for example, 2° / s).

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

[0039] Pitch drive enable: When the pitch drive enable is cut off (for example, when the pitch drive enable signal is a preset voltage (for example, 0V)), the pitch drive will brake the motor in a very short time and then apply the brake after stopping. The motor cannot rotate if any operation is performed at this time.

[0040] Pitch drive virtual limit: When the pitch drive enable is cut off by the pitch controller, the pitch controller will set a virtual limit value for the pitch drive (for example, 0°~40° or 0°~70°). At this time, even if the pitch drive enable is restored, the motor can only move between 0°~40° or 0°~70°, ensuring that after the wind turbine is powered on again, before the pitch controller and the pitch drive establish communication, the pitch drive will not automatically retract the blades in the 90° direction. Here, the virtual limit can only be used on the Dankong platform, because: when the Dankong platform is powered on again, the pitch drive completes initialization before the pitch controller. Before the communication between the two is established, the pitch controller cannot output the signal to cut off the pitch drive enable. When the safety chain is disconnected and the 89° switch is not triggered, the pitch drive will automatically perform the retracting operation. Therefore, it is necessary to turn on the virtual limit function of the pitch drive to ensure that the pitch drive can maintain the current position unchanged even if the safety chain is disconnected when the anti-vortex is completed. However, it should be understood that the above-mentioned virtual limit function can also be applied to other variable pitch platforms that have similar problems as the Dankong platform.

[0041] Planned power outage window period: the time required for the anti-vortex blades to change pitch from 90° to 40° (or 70°) when the machine is shut down and the time required for the anti-vortex blades to change pitch from 40° (or 70°) to 90° when the machine is started. The calculation formula is:

[0042]

[0043] The compensation time is the time it takes for the pitch controller to cut off the pitch drive enable and write the virtual limit. It is the time required for the anti-vortex blade to change pitch from 90° to 40° (or 70°) and from 40° (or 70°) to 90°. 0 means that the anti-vortex blade is at the target position and no angle adjustment is required. 120s is the maximum time of the window period. In addition, since only the Dankong platform needs to turn on the virtual limit function of the pitch drive, the compensation time of the Dankong platform can be set to be higher than that of the Huichuan platform and the low-pressure platform. For example, the compensation time of the Dankong platform can be 30s, and the compensation time of the Huichuan platform and the low-pressure platform can be 10s. In addition, the length setting of the planned power outage window period can also be similarly applied to other situations where the angle of the anti-vortex blade is adjusted from the normal shutdown pitch angle to the anti-vortex pitch angle when the wind turbine is shut down (for example, forced anti-vortex mode, shutdown anti-vortex mode).

[0044] Unplanned power outage window period: When the fan loses power unexpectedly, it needs to complete the anti-vortex posture of 90°-90°-40° (or 70°) within the specified time. The time spent in this process is the unplanned power outage window period. The calculation formula is:

[0045]

[0046] If the blades are at Y° when the power is off, the fan needs at least seconds to adjust to the posture, Δ is the preset deviation time, and the minimum window period is The larger value of , the maximum is 120s. For example, assuming that the blade is at 0° when the power is off, the retraction speed is 1° / s, Δ is 5s, the compensation time of the Dankong 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] Propeller stuck: When the wind turbine triggers an emergency stop and retracts the propellers, before the blades reach a safe position, if the variable pitch system determines that the blade position changes by less than, for example, 1° within a preset time (e.g., 5s), it is determined that the blade is stuck. The stuck propeller logic applies to any blade, and the anti-vortex function cannot be performed after the propeller is stuck. It should be understood that the anti-vortex blade stops in the anti-vortex position and does not belong to a stuck propeller.

[0048] Figure 1 is a schematic structural diagram showing 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 may control various operations of the pitch system 120, and the pitch system 120 may 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, a control word of 0 can indicate that the anti-vortex function is turned on, 1 can indicate that the pitch drive enable is cut off, 2 can indicate that the anti-vortex function is exited, 3 indicates that the anti-vortex function is forced to exit, 4 indicates dual anti-vortex angle switching (low level: anti-vortex position 1; high level: anti-vortex position 2), 6 indicates unplanned power failure and anti-vortex function enable (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 controls. The pitch controller 121 can feedback to the main control system 110 the pitch system anti-vortex feedback word (which can be valid at a given level, such as a high level, and the feedback word is 0 to indicate that the anti-vortex mode is turned on, and 1 to indicate that the anti-vortex function is completed (for example, the pitch drive enable has been switched and the virtual limit has been turned on), and 3 indicates the whole machine anti-vortex state query pulse (2s pulse signal)), the pitch system fault word (which can be valid at a given level, such as a high level, including a fault word for indicating a pitch anti-vortex timeout and a control word for indicating a large pitch anti-vortex position deviation), the actual pitch position of the blades and other information.

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

[0052] The pitch controller 121 controls the pitch driver 123 by adjusting the pitch speed and opening 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 driver 123 can feed back the three-blade pitch position and anti-vortex feedback signals to the pitch controller 121, and feedback to the pitch controller 121 whether the blades have reached the specified position and whether the 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. The pitch reducer 125 drives the pitch bearing 126 through a toothed belt, thereby controlling the blade 200 to rotate to a specified position.

[0055] The above-mentioned devices and components and their functions are known to those skilled in the art, so for the sake of brevity, they will not be described in more detail here. Figure 2 The anti-vortex-induced vibration control method disclosed in the present invention is described in detail. Figure 2The anti-vortex-induced vibration control method shown may be executed by a main control system 110 independent of the pitch system 120 or manually, but this is only an example. Figure 2 The execution subject of the anti-vortex-induced vibration control method shown is not particularly limited.

[0056] Figure 2 is a flow chart showing an anti-vortex-induced vibration control method for a wind turbine according to a first embodiment of the present disclosure.

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

[0058] In step S1210, the wind speed at the location of the wind turbine is determined. The wind speed here may be an average wind speed within a predetermined time period (for example, an average wind speed within 10 minutes).

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

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

[0061] The pitch controller 121 of the pitch system 120 may control the pitch driver 123 in response to the first control instruction, 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 may be a wind speed threshold under extreme wind conditions where the wind speed exceeds a threshold, the threshold may be 28 m / s, and the first wind speed threshold may be 30 m / s. As another example, the first wind speed threshold may be greater than or equal to 28 m / s.

[0063] In step S1220, in response to the wind speed being greater than the first wind speed threshold, the anti-vortex position of the blade of the wind turbine is determined to be a second preset anti-vortex position different from the first preset anti-vortex position, and a second control instruction for pitching the blade to the second preset anti-vortex position is sent to the pitch system. The first preset anti-vortex position is different from the second preset anti-vortex position, which may indicate that the minimum pitch angle is different. 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 may control the pitch driver 123 in response to the second control instruction, 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 may be in the range of 30 to 50 degrees. As an example, the pitch angles of the blades in the first preset anti-vortex position may be 90°-90°-40°, respectively. The minimum pitch angle of the blades in the second preset anti-vortex position may be in the range of 60 to 80 degrees. As an example, the pitch angles of the blades in the second preset anti-vortex position may be 90°-90°-70°, respectively.

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

[0067] Specifically, the anti-vortex-induced vibration control method according to an embodiment of the present disclosure may also 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 instruction for pitching the blade to a second preset anti-vortex position is sent to the pitch system.

[0068] That is to say, when the blade is in the first preset anti-vortex position and the wind speed exceeds the first wind speed threshold (extreme working condition), a second control instruction for changing the blade pitch to the second preset anti-vortex position can be sent to the pitch system. When the anti-vortex-induced vibration method is executed by a control system such as a main control system, whether the blade is pitched to the first preset anti-vortex position can be determined based on information such as the actual pitch position of the blade fed back by the pitch system. When the anti-vortex-induced vibration method is executed manually, it can be judged by the naked eye or by other information that can reflect the actual position of the blade.

[0069] Figure 3 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 the first preset anti-vortex position and the wind speed becoming greater than the first wind speed threshold (from the wind speed being less than or equal to the first wind speed threshold to being 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 blades being pitched to the maximum pitch angle, the anti-vortex mode is re-entered, and a second control instruction for pitching the blades to a second preset anti-vortex position is sent to the pitch system.

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

[0073] According to an embodiment of the present disclosure, the anti-vortex-induced vibration control method 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 instruction for causing the blade to pitch to a first preset anti-vortex position is sent to the pitch system.

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

[0075] That is to say, 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 instruction for pitching the blade to the first preset anti-vortex position may be sent to the pitch system.

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

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

[0078] In step S1410, in response to the blades being pitched to a second preset anti-vortex position and the wind speed becoming less than or equal to a first wind speed threshold (from a 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 entry / exit switching of anti-vortex mode.

[0080] In step S1420, in response to the blades being pitched to a maximum pitch angle, the anti-vortex mode is re-entered, and a first control instruction for pitching the blades to a first preset anti-vortex position is sent to the pitch system.

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

[0082] In other words, to switch from the second preset anti-vortex position of 90°-90°-70° to the first preset anti-vortex position of 90°-90°-40°, you can first exit the anti-vortex mode, feather the blades with a pitch angle of 70° to 90°, then enter the anti-vortex mode, and finally control one of the blades to open the pitch to 40°.

[0083] Although not shown, for the situation where the wind speed changes from normal wind speed to extreme wind speed, switching can be performed in the following manner. For example, one method is: after the three blades are retracted to 70°, the anti-vortex blade stops changing the pitch, and the other two blades continue to retract to 90°. Another method is: after the three blades are retracted to 90° in a normal shutdown manner, the anti-vortex blade changes the pitch to 70° at a small angle.

[0084] Since the impeller is still rotating during the shutdown process, the former anti-vortex pitch strategy will cause aerodynamic imbalance of the impeller, which will bring fatigue load to the unit, so the latter anti-vortex pitch strategy can be adopted. Similarly, when the unit is started, the anti-vortex blades must be retracted to 90° first, and then the three blades are opened at the same time to start the unit.

[0085] In summary, when the unit uses dual anti-vortex positions, if the wind speed exceeds the first wind speed threshold, the unit will exit the anti-vortex mode, and after the three blades stop at the maximum parking pitch angle, it will re-enter the anti-vortex mode, at which time the anti-vortex blades will stop at the second preset anti-vortex position. When the wind speed drops to meet the conditions, the unit will exit the anti-vortex mode, the three blades will stop at the maximum parking pitch angle, and the unit will re-enter the anti-vortex mode, at which time the anti-vortex blades will stop at the first preset anti-vortex position.

[0086] Figure 5 is a flow chart showing an anti-vortex-induced vibration control method for a wind turbine according to a second embodiment of the present disclosure. Figure 5 The anti-vortex-induced vibration control method shown can be executed by a pitch system of a wind turbine.

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

[0088] As shown above, the anti-vortex mode may include a shutdown anti-vortex mode, a planned power-off anti-vortex mode, an unplanned power-off anti-vortex mode, and a forced anti-vortex mode. The explanations of these anti-vortex modes have been described in detail above and will not be repeated here.

[0089] In an embodiment of the present disclosure, the pitch system 120 can determine whether the wind turbine enters the anti-vortex mode by determining whether an anti-vortex start signal is received from the main control system 110, or determine whether the wind turbine enters the anti-vortex mode by determining whether a first preset condition for the unplanned power outage anti-vortex mode is met. In response to receiving an anti-vortex start signal from the main control system 110 or satisfying the first preset condition for the unplanned power outage anti-vortex mode, the pitch system 120 can determine that the wind turbine enters the 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-off anti-vortex mode, or the fourth preset condition for the forced anti-vortex mode is met, the main control system 110 may send an anti-vortex start signal to the pitch system 120, so that the pitch system performs the next operation. Alternatively, in the case of an unplanned power outage, the pitch system 120 may also determine whether to enter the anti-vortex mode based on whether the first preset condition for the unplanned power-off anti-vortex mode is met.

[0091] In an embodiment of the present disclosure, the first preset condition may include: the wind turbine is out of power unplanned and the pitch angle of the wind turbine blades is less than the anti-vortex pitch angle when the power is off. The second preset condition may include: the wind turbine is in a shutdown state and the shutdown anti-vortex function is turned on. The third preset condition may include: the wind turbine is in a shutdown state and the planned power outage anti-vortex is turned on. The fourth preset condition may include: the wind turbine is in a shutdown or maintenance state and the forced anti-vortex function is turned on. It should be understood that the setting of the above preset conditions is only an example, and the present disclosure is not limited thereto. The specific content of each preset condition can also be modified, added or deleted according to actual needs.

[0092] In the event of an unexpected power outage, the unit safety chain will be abnormal, and the main control system will not be able to control the variable pitch to stop at the anti-turbulence pitch angle. Therefore, in the event of a power grid failure, the variable pitch system will complete the unplanned power outage anti-turbulence function. When the unit cannot complete the anti-turbulence, it needs to be powered by a diesel generator, and then the operation and maintenance personnel will control the unit to change the pitch to the anti-turbulence pitch angle at the bottom of the tower.

[0093] In step S220 , in response to the fan entering the anti-vortex mode, the anti-vortex function may be turned on and the window period may be triggered.

[0094] In an embodiment of the present disclosure, as can be seen from the above explanation of the window period, the window period may indicate 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°), cut off the pitch drive enable of the pitch drive and write the virtual limit (in the case of the Dan control platform). As described above, the length of the window period may depend on the preset pitch rate and the preset compensation time for the pitch drive (that is, considering the preset compensation time for cutting off the pitch drive enable of the pitch drive and writing the virtual limit), and in the case of an unplanned power-off anti-vortex mode, it also depends on the angle of the wind turbine blades when the power is cut off.

[0095] In addition, in the embodiment of the present disclosure, the trigger window period refers to the start of timing until the window period ends.

[0096] Afterwards, in step S230, the blades of the wind turbine may be adjusted to a preset anti-vortex position within the window period. Specifically, the blades of the wind turbine may 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 described above, the first preset anti-vortex position may be an anti-vortex position determined in response to a wind speed being less than or equal to a first wind speed threshold, the second preset anti-vortex position may be an anti-vortex position determined in response to a wind speed being greater than a first wind speed threshold, and the first wind speed threshold may be a wind speed threshold under extreme wind conditions where the wind speed exceeds a preset threshold.

[0097] Specifically, the pitch system 120 may first shield 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 speaking, the anti-vortex blade position comparison fault function is used to determine whether the blade is at a normal shutdown pitch angle. If the blade is not at a normal shutdown pitch angle, it is determined that the wind turbine has a fault. In an embodiment of the present disclosure, which of the three blades of the wind turbine is selected as the anti-vortex blade may be predetermined. For example, when the wind turbine enters the anti-vortex mode, the main control system 110 may send information on entering the anti-vortex mode to the pitch system 120, or a fixed blade (for example, blade #1) may 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 blade is adjusted to the preset anti-vortex pitch angle, and if not, it can continue to adjust. If the pitch angle of the anti-vortex blade has been adjusted to the preset anti-vortex pitch angle, and the other blades except the anti-vortex blade are at the normal parking pitch angle, it can be determined that the blades of the wind turbine have reached the preset anti-vortex position (that is, the first preset anti-vortex position or the second preset anti-vortex position).

[0099] In an embodiment of the present disclosure, the preset anti-vortex position may 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 may be 90°. Here, adjusting the anti-vortex blade to the preset anti-vortex pitch angle may refer to adjusting the anti-vortex blade 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 angles, it can be determined that the blades of the wind turbine have reached the preset anti-vortex position (for example, the first preset anti-vortex position or the second preset anti-vortex position).

[0101] That is to say, when the anti-vortex mode is the shutdown anti-vortex mode, or the planned power-off anti-vortex mode, or the forced anti-vortex mode, before the anti-vortex mode starts, the fan is in a shutdown state, and the positions of the three blades are all at the shutdown pitch angle (for example, 90°). At this time, only the pitch angle of the anti-vortex blade can be adjusted to the anti-vortex pitch angle (for example, 40° or 70°), that is, the anti-vortex blade is controlled to reach the preset anti-vortex position. However, when the anti-vortex mode is the unplanned power-off anti-vortex mode, it means that the fan may be in an operating state before the power is off, and the positions of the three blades may be at the operating angle (for example, 0°). At this time, not only the pitch angle of the anti-vortex blade must be adjusted to the anti-vortex pitch angle (for example, 40° (or 70°)), but also the pitch angle of the non-anti-vortex blade must be adjusted to the normal shutdown pitch angle (for example, 90°) to make the fan blade reach the preset anti-vortex position.

[0102] In an embodiment of the present disclosure, after the pitch angle of the anti-vortex blade is adjusted to the preset anti-vortex pitch angle, the pitch system 120 can cut off the pitch drive enable signal of the anti-vortex blade based on the pitch drive enable cut-off signal sent by the main control system 110, that is, cut off the pitch drive enable signal of the pitch drive 113 used to drive the anti-vortex blade to keep the pitch angle of the anti-vortex blade at the anti-vortex pitch angle. It should be understood that in an embodiment of the present disclosure, when the pitch system 120 adjusts the angle of the blade, 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 a pitch system control signal based on this information in real time. 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] When the fan blades reach the preset anti-vortex position, the pitch drive enable signal is cut off and the virtual limit is written (in the case of the Dan control platform), it can be determined that the fan has completed the anti-vortex operation. At this time, the pitch system 120 can feedback the anti-vortex completion signal to the main control system 110.

[0104] In addition, the anti-vortex-induced vibration control method according to the embodiment of the present disclosure can not only automatically enter the anti-vortex mode as described above, but also automatically exit the anti-vortex mode in some cases.

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

[0106] Exit conditions for shutdown anti-vortex mode

[0107] When any of the following operating conditions occurs, the unit will not enter the shutdown anti-vortex mode after shutdown. If it has entered the shutdown anti-vortex mode, it needs to exit the anti-vortex mode:

[0108] a) The unit triggers NA overspeed;

[0109] b) Before the unit completes the anti-turbulence, the pitch change fault is triggered;

[0110] c) Before the unit completes the anti-turbulence, a power grid fault is triggered (i.e. before the power grid is powered off, if the unit has not completed the anti-turbulence, the unit will retract the propellers to the normal parking pitch angle);

[0111] d) After the unit completes the anti-vortex mode, the unit speed exceeds the anti-vortex speed threshold (to prevent the impeller from rotating in the anti-vortex mode, resulting in excessive fatigue load);

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

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

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

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

[0116] When any of the following operating conditions occurs, the unit cannot enter the planned power-off anti-vortex mode. If it has entered the planned power-off anti-vortex mode, it needs to exit the anti-vortex mode:

[0117] a) The unit triggers NA overspeed;

[0118] b) Before the unit completes the anti-turbulence, a pitch change fault is triggered;

[0119] c) Before the unit completes the anti-turbulence, a power grid fault is triggered (i.e. before the power grid is powered off, if the unit has not completed the anti-turbulence, the unit will retract the propellers to the normal parking pitch angle);

[0120] d) After the unit completes the anti-vortex mode, the unit speed exceeds the anti-vortex speed threshold (to prevent the impeller from rotating in the anti-vortex mode, resulting in excessive fatigue load);

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

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

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

[0124] Exit conditions for forced anti-vortex mode

[0125] When any of the following operating conditions occurs, the unit cannot enter the forced anti-vortex mode. If it has entered the forced anti-vortex mode, it needs to exit the anti-vortex mode:

[0126] a) Before the unit completes anti-turbulence, a pitch change fault is triggered;

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

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

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

[0130] e) The safety door is opened (i.e. after this operation is triggered, it is determined that there is a possibility of maintenance personnel entering the hub, and the blades must be retracted to the normal parking pitch angle first);

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

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

[0133] In an embodiment of the present disclosure, when the main control system 110 detects that one of the above 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 a de-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 drive enable signal of the anti-vortex blade, and then adjust the blades of the wind turbine to the parking position within the window period, and turn on the anti-vortex blade position comparison fault function after the window period ends, so that the pitch system 120 can normally perform the blade position comparison function.

[0134] In addition, when the pitch system 120 itself detects that one of the above-mentioned exit conditions is met, for example, when the pitch system 120 detects a pitch-type fault in the anti-vortex mode, the pitch system 120 can restore the pitch driver enable signal of the anti-vortex blade and turn on the anti-vortex blade position comparison fault function, so that the blade automatically returns to the normal shutdown pitch angle.

[0135] When the unit does not enable the dual anti-vortex position, the unit's anti-vortex position defaults to the first preset anti-vortex position (anti-vortex position 1, 90°-90°-40°). When the second preset anti-vortex position is forced to be selected, the anti-vortex target 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 forced to be selected, the dual anti-vortex function is enabled, and the anti-vortex target position is the second preset anti-vortex position when the 10-minute average wind speed exceeds the first wind speed threshold and the three blades are in the parking position. In other words, when the anti-vortex position is switched, you can first determine whether to force the selection of a certain anti-vortex position, and then make a selection.

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

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

[0138] In step S1520 , it is determined whether the anti-vortex position 2 is forcibly selected. If the anti-vortex position 2 is forcibly selected, step S1560 is executed to select the anti-vortex position 2.

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

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

[0141] If the dual anti-vortex enable is not turned on, 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 the three blades are in the maximum stop position, then in step S1560, the anti-vortex position 2 is selected.

[0144] If the three blades are not in the maximum stop position, the current target position is determined as the anti-vortex position 1. In other words, the anti-vortex position can be switched after the three blades of the fan are in the state of 90°-90°-90°.

[0145] The switch from the anti-vortex position 2 to the anti-vortex position 1 may be similar to this, and will not be repeated here. When switching from the anti-vortex position 2 to the anti-vortex position 1, hysteresis control may be performed. For example, the switch may be performed when the wind speed is significantly less than the first wind speed threshold, for example, the difference between the wind speed and the first wind speed threshold is greater than or equal to a preset threshold value (for example, 3 m / s) that is not zero.

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

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

[0148] like Figure 7As shown, in step 301, the main control system 110 may determine whether the wind turbine enters the anti-vortex mode. When the wind turbine enters the anti-vortex mode, in step 302, the main control system 110 may send an anti-vortex start signal (e.g., a 2s pulse) to the pitch system 120. Thereafter, in step 303, the main control system 110 may determine whether an anti-vortex mode start feedback signal is received from the pitch system 120. After receiving the anti-vortex mode on feedback signal, in step S304, the main control system 110 may shield 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 may determine that the 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 (for example, 2deg / s) (step S305), and then continue to detect whether the blade pitch angle of the anti-vortex blade is greater than the anti-vortex pitch angle (step S306), and return to the previous step to continue adjustment if it is greater than the anti-vortex pitch angle (step S306-No). On the contrary, when the blade pitch angle of the anti-vortex blade is not greater than the anti-vortex pitch angle (step 304-No, step S306-Yes), the main control system 110 may determine whether the blade pitch angle of the anti-vortex blade is greater than (anti-vortex pitch angle-2°). Here, 2° is only an example, and can be adjusted according to actual conditions during 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 an over-limit fault, so it is necessary to exit the anti-vortex (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 the 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, and then determine 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 pitch system 120 side has completed the anti-vortex.

[0149] Figure 8 An exemplary flow chart of a devortex process of a main 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 may determine whether the wind turbine exits the anti-vortex mode (for example, exits the anti-vortex mode based on whether one of the preset exit conditions is met). When it is determined that the wind turbine exits the anti-vortex mode, in step 402, the main control system 110 may send an anti-vortex function exit signal (for example, a 2s pulse) to the pitch system 120. Thereafter, in step 403, the main control system 110 may determine whether the anti-vortex mode on feedback received from the pitch system 120 is TRUE. If the anti-vortex mode on feedback is TRUE (S403-Yes), continue to wait. If the anti-vortex mode on feedback is FALSE (S403-No), then in step S404, the main control system 110 detects the blade pitch angle of the anti-vortex blade to determine 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 parking pitch angle (S404-Yes), the main control system 110 may determine that the pitch angle of the anti-vortex blade needs to be adjusted, and control the pitch system 120 to adjust the anti-vortex blade in the direction of the normal parking pitch angle at a preset pitch rate (for example, 2 degrees / s) in step S405, and then continue to detect in step S406 whether the blade pitch angle of the anti-vortex blade is greater than or equal to (normal parking pitch angle-2°) and lasts for a period of time (for example, 5 seconds). Here, 2° is only an example, and it can also be adjusted according to actual conditions during specific implementation. When the blade pitch angle of the anti-vortex blade is greater than or equal to (normal parking pitch angle-2°) and lasts for a period of time (step S406-Yes), the pitch change can be stopped and the anti-vortex blade position comparison fault function can be turned on (step 407). In addition, 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 may perform the comparison in step S406 and execute subsequent operations.

[0151] Fig. 9 An example flow chart of an anti-vortex process of the pitch system 120 according to an embodiment of the present disclosure is shown. Fig. 9 The flowchart is only for shutdown anti-turbulence mode, planned power-off anti-turbulence mode and forced anti-turbulence mode.

[0152] like Fig. 9As shown, in step 501, the pitch system 120 may receive the anti-vortex function start signal sent by the main control system 110. In addition, although not shown, before receiving the anti-vortex function start signal, a dual anti-vortex switching signal may also be identified (for example, it may be 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 may be provided by the main control system, and may be determined by the main control system according to wind speed, etc. (for example, 90°-90°-40° or 90°-90°-70°). The pitch system 120 may identify the dual anti-vortex switching signal sent by the main control after determining that the blades of the wind turbine are in a state of 90°-90°-90°, 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 triggers the window period in step 503. Afterwards, in step 504, it can be determined whether the current period is still within the window period. If so (step 504-yes), in step 505, feedback of the anti-vortex mode on is sent to the main control system 110, and the feedback enters the anti-vortex mode, and in step 506, the anti-vortex blade position comparison fault function is shielded. During this process, the pitch system 120 can continuously send the angle of the anti-vortex blade to the main control system 110. In step 507, the pitch system 120 can adjust the position of the anti-vortex blade of the wind turbine and determine whether the three blades of the wind turbine have reached the preset anti-vortex position (for example, 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, and the anti-vortex blade is selected in step 509 (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), and the pitch driver enable signal of the anti-vortex blade is cut off in step 510 (at this time, it can be cut off after further judging that the parking position of the blade is the same as the preset anti-vortex position (there may be a certain error)), and then in step 511, the driver virtual limit of the anti-vortex blade is set (only executed in the case of the Dan control platform, and can be omitted for other platforms), in step 512, the pitch driver enable signal is written into the power-off retention area, and in step 513, the anti-vortex function completion feedback is sent to the main control system 110, and the anti-vortex completion is fed back, 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 means that the anti-vortex is successful and the process ends. If the blade position deviates from the preset anti-vortex position (step 514-yes), it is determined in step 515 that a pitch trigger fault "blade deviates from the anti-vortex position after anti-vortex is completed" occurs.At this time, the de-vortex process can be entered, the anti-vortex mode can be exited in step 518, the virtual limit of the driver of the anti-vortex blade can be cleared in step 519 (only executed in the case of the Dankong platform, and can be omitted on other platforms), the variable pitch drive enable signal can be restored in step 520 and the anti-vortex blade position comparison fault function can be turned on (i.e., unshielded) in step 521. At this time, since the anti-vortex blade position comparison fault function has been turned on, the blades of the wind turbine can be automatically adjusted to the shutdown pitch angle under the control of this function.

[0153] In addition, if it is determined in step 504 that the current window period is not within the window period (step 504-no), the pitch system can determine whether the anti-vortex or anti-vortex switching is completed in step 516. If it is completed (step 516-yes), the current process ends. If it is not completed (step 516-no), it is determined in step 517 that the pitch trigger fault "anti-vortex timeout" occurs, and the process proceeds to step 518 to perform the subsequent de-vortex process.

[0154] Fig.10 An example flow chart showing an anti-vortex process of a constant pressure pitch system according to an embodiment of the present disclosure is shown. Fig.10 The flowchart is only for the unplanned power outage anti-vortex mode.

[0155] like Fig.10As shown, when an unplanned power outage occurs, in step 601, the pitch system 120 can determine whether a resolver fault or a stuck propeller occurs. If a resolver fault or a stuck propeller occurs (step S601-yes), the current process is exited because the anti-vortex cannot be performed. If there is no resolver fault or a stuck propeller (step S601-no), it can be determined in step 602 whether the pitch angle of the anti-vortex blade is less than the anti-vortex pitch angle. If the pitch angle of the anti-vortex blade is greater than the anti-vortex pitch angle (step S602-no), as mentioned above, in this case, the anti-vortex blade cannot be opened to a small angle due to the protection function of the unit safety chain, so the current process is exited. If the pitch angle of the anti-vortex blade is less than the anti-vortex pitch angle (step S602-yes), then in step 603, the pitch system can enter the anti-vortex mode and trigger the window period in step 604. Afterwards, 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), in step 606, the anti-vortex mode start feedback is sent to the main control system 110, the feedback enters the anti-vortex mode, and in step 607, the anti-vortex blade is selected and the anti-vortex blade position comparison fault function is shielded. In step 608, the pitch system 120 can adjust the position of the anti-vortex blade of the wind turbine and determine whether the pitch angle of the anti-vortex blade reaches the anti-vortex pitch angle (for example, 40° or 70°). If (step 608-yes), in step 609, the pitch system 120 cuts off the pitch drive enable signal (to ensure that the blade can stop within the range of, for example, (40 (or 70) ± 1)°, the operation of cutting off the enable signal can be performed at 39° or 60°). Then, in step 610, determine whether the pitch angle of the non-anti-vortex blade reaches the parking pitch angle. If it does not reach the parking pitch angle (step 610-no), return to step 610 to continue adjusting the pitch angle of the non-anti-vortex blade. If the pitch angle of the non-anti-vortex blade reaches the parking pitch angle (step 610-yes), the anti-vortex function completion feedback can be sent to the main control system 110 in step 611, and the anti-vortex completion feedback can be written to the power-off retention area in step 612 (the order of steps 611 and 612 can also be interchanged). Steps 613 to 619 are the same as Figure 5 Steps 515 to 521 are similar and thus will not be explained in detail.

[0156] Fig.11 An example flow chart of the de-vortex process of the constant pressure pitch system according to an embodiment of the present disclosure is shown. In the embodiment of the present disclosure, the process is initiated and controlled by the main control system 110, and the main control system 110 can send an exit anti-vortex signal to the pitch system 120 to make the pitch system 120 exit the anti-vortex mode.

[0157] In an embodiment of the present disclosure, when the anti-vortex mode exit condition described above is met, the main control system 110 may send an anti-vortex mode exit signal.

[0158] Reference Fig.11 In step 701, the pitch system 120 may receive the anti-vortex exit signal sent by the main control system 110, then exit the anti-vortex mode in step 702 and trigger the window period in step 703, then clear the virtual limit of the driver of the anti-vortex blade in step 704 (this step is only performed on the Dan control platform and may not be performed on other platforms), restore the pitch driver enable signal of the anti-vortex blade in step 705, and 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, it may be determined in step 707 whether the window period has ended. If it has not ended (step 706-no), continue to wait. If the window period has ended (step 707-yes), then in step 708, the pitch system 120 may cancel the shielding blade position comparison fault function (i.e., start the blade position comparison fault function) so that the blade can resume normal operation.

[0159] Reference above Figures 9 to 11 The anti-vortex process and de-vortex process of the normal pressure pitch system are described. However, it should be understood that since the low-pressure pitch system does not use the Dan control platform, the anti-vortex process and de-vortex process of the low-pressure pitch system do not include steps related to the virtual limit of the drive. In addition, in the low-pressure pitch system, in the unplanned power-off anti-vortex mode, if the main control and pitch communication failure occurs after the box transformer is powered off, the anti-vortex module will not be entered, and the other steps are similar to the normal pressure pitch system, so for the sake of simplicity, they will not be described in detail here.

[0160] Fig.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 Fig.12 According to an exemplary embodiment of the present disclosure, an 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 an embodiment of the present disclosure, the anti-vortex mode confirmation module 810 may be configured to determine whether the fan enters the anti-vortex mode. Here, the anti-vortex mode may include a shutdown anti-vortex mode, a planned power-off anti-vortex mode, an unplanned power-off anti-vortex mode, and a forced anti-vortex mode. The anti-vortex mode confirmation module 810 may determine whether an anti-vortex start signal is received from the main control system of the fan or whether the first preset condition for the unplanned power-off anti-vortex mode is met, and in response to receiving an anti-vortex start signal from the main control system or meeting the first preset condition for the unplanned power-off anti-vortex mode, determine that the fan enters the anti-vortex mode. Here, the anti-vortex start signal is sent by the main control system when the second preset condition for the shutdown anti-vortex mode, the third preset condition for the planned power-off anti-vortex mode, or the fourth preset condition for the forced anti-vortex mode is met.

[0163] The anti-vortex triggering module 820 may activate the anti-vortex function and trigger the window period in response to the fan entering the anti-vortex mode.

[0164] In an embodiment of the present disclosure, the first preset condition may include: the fan is out of power unplanned and the pitch angle of the fan blades is less than the anti-vortex pitch angle during the power outage. The second preset condition may include: the fan is in a shutdown state and the shutdown anti-vortex function is turned on. The third preset condition may include: the fan is in a shutdown state and the planned power outage anti-vortex is turned on. The fourth preset condition may include: the fan is in a shutdown or maintenance state and the forced anti-vortex function is turned on.

[0165] In an embodiment of the present disclosure, the 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.

[0166] The anti-vortex execution module 830 may adjust the blades of the fan 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 may indicate the minimum time required to complete the anti-vortex function. Under the dual anti-vortex scheme, the window period may 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. The first preset anti-vortex position here is 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 is an anti-vortex position determined in response to a wind speed greater than the first wind speed threshold. The first wind speed threshold may be as described above and will not be repeated here.

[0167] In an embodiment of the present disclosure, when adjusting the blades of the wind turbine to a preset anti-vortex position, the anti-vortex execution module 830 may shield 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 is adjusted to the preset anti-vortex pitch angle, and in response to the pitch angle of the anti-vortex blade being adjusted to the preset anti-vortex pitch angle and the blades other than 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 an embodiment of the present disclosure, after the pitch angle of the anti-vortex blade is adjusted to a preset anti-vortex pitch angle, the anti-vortex execution module 830 may 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 main control system of the wind turbine to maintain the pitch angle of the anti-vortex blade.

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

[0170] In an embodiment of the present disclosure, when an exit anti-vortex signal is received from the main control system of the wind turbine, the de-vortex execution module (not shown) can restore the pitch driver enable signal of the anti-vortex blades and trigger a window period, and adjust the blades of the wind turbine to the parking position during the window period, and turn on the anti-vortex blade position comparison fault function. Here, the exit anti-vortex signal is sent by the main control system when the exit condition is detected. In addition, when a pitch type fault is detected in the anti-vortex mode, the de-vortex execution module (not shown) can restore the pitch driver enable signal of the anti-vortex blades and turn on the anti-vortex blade position comparison fault function.

[0171] The anti-vortex-induced vibration control method and system for a wind turbine according to an embodiment of the present disclosure can be applied to various application scenarios such as before the wind turbine is powered on, when the wind turbine is in operation, when the power grid is powered off, when the unit is under maintenance, when the anti-vortex is exited, in extreme wind conditions, etc. The following Tables 1 to 5 illustrate some specific examples of these application scenarios, corresponding working conditions, shutdown angles after implementing the anti-vortex-induced vibration control scheme of the present disclosure (i.e., the angles at which the blades are located after implementing the anti-vortex-induced vibration control scheme of the present disclosure), and implementation schemes.

[0172] Table 1 Application scenarios before the fan is powered on

[0173]

[0174]

[0175] Table 2 Application scenarios where the fan is in operation

[0176]

[0177] Table 3 Application scenarios when the power grid is powered off

[0178]

[0179]

[0180] Table 4 Application scenarios for unit maintenance

[0181]

[0182] Table 5 Application scenarios when exiting anti-vortex

[0183]

[0184]

[0185] The above has been referred to Figures 1 to 12 The anti-vortex-induced vibration control method and system for a wind turbine according to an exemplary embodiment of the present disclosure are described. However, it should be understood that the devices and systems shown in the accompanying drawings may be configured as software, hardware, firmware, or any combination of the above items to perform specific functions. For example, these systems and devices may correspond to dedicated integrated circuits, pure software codes, or modules that combine software and hardware. In addition, one or more functions implemented by these systems or devices may also be uniformly performed by components in physical entity devices (e.g., processors, clients, or servers, etc.).

[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 is prompted to perform at least one of the above steps.

[0187] The instructions stored in the computer-readable storage medium can be executed in an environment deployed in a computer device such as a client, a host, an agent device, a server, etc. It should be noted that the instructions can also be used to perform additional steps in addition to the above steps or perform more specific processing when performing the above steps. The contents of these additional steps and further processing have been described in detail in reference to Figures 1 to 12 It is mentioned in the description of related systems and methods, so it 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 the present disclosure can completely rely on the operation of computer programs or instructions to realize 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 (for example, lib library) to realize the corresponding functions.

[0189] On the other hand, when Fig.12When the systems and devices shown are implemented in software, firmware, middleware or microcode, the program code or code segments for performing the corresponding operations 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 operations by reading and running the corresponding program code or code segments. In addition, the computer-readable medium or storage medium can cause the processor to execute the above-mentioned 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 including a readable medium storing computer program instructions may be provided, wherein the instructions, when executed by at least one computing device, prompt the at least one computing device to perform at least one of the above steps.

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

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

[0193] By applying the anti-vortex-induced vibration control method, device and system for a wind turbine according to the embodiments of the present disclosure, it is possible to cope with vortex-induced vibrations under extreme wind conditions.

[0194] In addition, by applying the anti-vortex-induced vibration control method, device and system for a wind turbine according to the embodiments of the present disclosure, the workload of maintenance personnel can be reduced, the fatigue load of the wind turbine can be reduced, or economic losses can be reduced.

[0195] The anti-vortex-induced vibration control method, device and system for a wind turbine according to the embodiments of the present disclosure do not conflict with the design of the existing safety chain of the wind turbine, and the blades still feather backward after the safety chain breaks. Thus, the blades can be stopped in the anti-vortex position without modifying the safety chain control logic or shielding the safety chain failure.

Claims

1. A method for controlling vortex-induced vibration of a fan, characterized in that: The anti-vortex-induced vibration control method comprises: Determining the wind speed at the location of the fan; In response to the wind speed being less than or equal to a first wind speed threshold, determining that the anti-vortex position of the blades of the wind turbine is 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 control system, wherein the first wind speed threshold is a wind speed threshold under extreme wind conditions where the wind speed exceeds a threshold threshold; In response to the wind speed being greater than the first wind speed threshold, the anti-vortex position of the blades of the wind turbine is determined to be a second preset anti-vortex position different from the first preset anti-vortex position, and a second control instruction for pitching the blades to the second preset anti-vortex position is sent to the pitch system.

2. The anti-vortex-induced vibration control method for a fan according to claim 1, characterized in that: The anti-vortex-induced vibration control method also includes: In response to the blade being pitched to the first preset anti-vortex position and the wind speed becoming greater than the first wind speed threshold, the second control instruction for pitching the blade to the second preset anti-vortex position is sent to the pitch system.

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

4. The anti-vortex-induced vibration control method for a fan according to claim 1, characterized in that: The anti-vortex-induced vibration control method also includes: In response to the blade 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, a first control instruction for pitching the blade to the first preset anti-vortex position is sent to the pitch system.

5. The anti-vortex-induced vibration control method for a fan according to claim 4, characterized in that: In response to the blade 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, the step of sending a first control instruction for pitching the blade to the first preset anti-vortex position to the pitch system 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, the anti-vortex mode is re-entered, and a first control instruction for pitching the blades to the first preset anti-vortex position is sent to the pitch system.

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

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

8. A method for controlling vortex-induced vibration of a fan, characterized in that: include: Determining whether the fan enters an anti-vortex mode; In response to the fan entering the anti-vortex mode, turning on the anti-vortex function and triggering the window period; The blades of the fan are adjusted 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, and the window period indicates a minimum time required to complete the anti-vortex function. Among them, 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.

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

10. The anti-vortex-induced vibration control method for a fan according to claim 9, characterized in that: The first preset condition includes: the wind turbine is out of power unexpectedly and the pitch angle of the wind turbine blades is less than the anti-vortex pitch angle when the power is out; The second preset condition includes: the fan is in a shutdown state and the shutdown anti-vortex function is turned on; The third preset condition includes: the fan is in shutdown state and the planned power outage anti-vortex function is turned on; The fourth preset condition includes: the fan is in a shutdown or maintenance state and the forced anti-vortex function is turned on.

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

12. The anti-vortex-induced vibration control method for a fan according to claim 11, characterized in that: The step of adjusting the blades of the fan 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 includes: Shield the anti-vortex blade position comparison fault function; adjusting the 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 the other blades except the anti-vortex blade being at the normal parking pitch angle, it is determined that the blades of the wind turbine have reached the first preset anti-vortex position or the second preset anti-vortex position.

13. The anti-vortex-induced vibration control method for a fan according to claim 12, characterized in that: After the pitch angle of the anti-vortex blade is adjusted to a preset anti-vortex pitch angle, the anti-vortex induced vibration control method further includes: Based on the pitch drive enable cut-off signal sent by the main control system of the wind turbine, the pitch drive enable signal of the anti-vortex blade is cut off to maintain the pitch angle of the anti-vortex blade.

14. The anti-vortex-induced vibration control method for a fan according to claim 13, characterized in that: The anti-vortex-induced vibration control method also includes: In response to the fan reaching a preset exit condition, the anti-vortex mode is exited.

15. The anti-vortex-induced vibration control method for a fan according to claim 14, characterized in that: The steps to exit anti-vortex mode include: When an anti-vortex exit signal is received from the main control system of the wind turbine, a window period is triggered and the pitch drive enable signal of the anti-vortex blade is restored, and the blades of the wind turbine are adjusted to the parking position within the window period, and the anti-vortex blade position comparison fault function is turned on after the window period ends, wherein the anti-vortex exit signal is sent by the main control system when the exit condition is detected, When a pitch fault is detected in the anti-vortex mode, the pitch driver enable signal of the anti-vortex blade is restored and the anti-vortex blade position comparison fault function is turned on.

16. An anti-vortex-induced vibration controller for a fan, characterized in that: The anti-vortex-induced vibration controller comprises: an anti-vortex mode confirmation module, configured to determine whether the fan enters the anti-vortex mode; an anti-vortex triggering module, configured to, in response to the fan entering the anti-vortex mode, turn on the anti-vortex function and trigger the window period; an anti-vortex execution module, configured to adjust the blades of the fan 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, wherein the window period indicates a minimum time required to complete an anti-vortex function, Among them, 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.

17. An anti-vortex-induced vibration control system for a fan, characterized in that: The control system comprises: A main control system, configured to execute the anti-vortex-induced vibration control method according to any one of claims 1 to 7; and A pitch system is configured to execute the anti-vortex-induced 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: When the computer program is executed by a processor, the processor is prompted to execute the anti-vortex-induced vibration control method according to any one of claims 1 to 7 or the anti-vortex-induced vibration control method according to any one of claims 8 to 15.

19. An electronic device, characterized in that: The electronic device comprises: processor; A memory storing a computer program, which, when executed by a processor, prompts the processor to execute the anti-vortex-induced vibration control method according to any one of claims 1 to 7 or the anti-vortex-induced vibration control method according to any one of claims 8 to 15.

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