A device and method for reducing wind-induced vibration of a hybrid wind tower

Abstract

The application discloses a device and method for reducing wind-induced vibration of a wind power hybrid tower, wherein the device is arranged at the bottom of a nacelle of the wind power hybrid tower and corresponds to a tower drum, and comprises a rotating assembly arranged on a side of the tower drum away from the nacelle, and an auxiliary pipe, one end of the auxiliary pipe is connected with the nacelle through a first displacement assembly, the other end of the auxiliary pipe is connected with the rotating assembly through a second displacement assembly, and a plurality of hole portions are arranged on the auxiliary pipe in sequence and at intervals, the auxiliary pipe can rotate along the circumference of the tower drum along with the nacelle, and when the wind power hybrid tower generates vibration, the distance between the auxiliary pipe and the tower drum can be adjusted, so that the airflow passing through the hole portions disturbs the wake vortex of the tower drum. According to the application, the rotating assembly drives the auxiliary pipe to rotate along the circumference of the tower drum, the displacement assembly adjusts the distance between the auxiliary pipe and the tower drum, and the auxiliary pipe with the hole portions cooperates to disturb the wake vortex by airflow, so that the airflow precisely disturbs the periodically falling wake vortex from an aerodynamic source, the wind-induced vibration suppression effect is improved, the fatigue damage of the tower drum is effectively reduced, and the service life of the structure of the wind power hybrid tower is prolonged.

Description

Technical Field

[0001] This invention relates to the field of vibration reduction of wind power structures, and more particularly to a device and method for reducing wind-induced vibration of wind turbine towers. Background Technology

[0002] With the continuous trend of increasing single-unit capacity, tower height, and rotor size in wind turbines, tower structures are becoming increasingly flexible, their natural frequencies are gradually decreasing, and wind-induced vibration is becoming increasingly prominent. Under the influence of incoming flow, the tower will experience cylindrical flow and periodic vortex shedding, which can easily lead to vortex-induced vibration, seriously threatening the safety of the tower structure and shortening its fatigue life.

[0003] Currently, control methods for wind-induced vibration of wind turbine tower structures mainly fall into two categories: one is to change the dynamic characteristics of the structure through mechanical dampers, thereby suppressing vibration with additional damping; the other is to adopt aerodynamic measures such as setting up fixed turbulence devices like helices to directly reduce the aerodynamic forces acting on the structure. Against the backdrop of rapid digitalization and intelligentization, active flow control aerodynamic measures offer a new direction for suppressing structural vibration. However, current mainstream active air-blowing technologies typically require openings on the structural surface, which is not only difficult to implement for wind turbine towers but also easily compromises the safety of the existing structure.

[0004] Therefore, existing technologies have drawbacks such as inability to adaptively control, damage to the original structure, and insufficient engineering applicability. Summary of the Invention

[0005] The purpose of this invention is to provide a device and method for reducing wind-induced vibration in wind turbine hybrid towers. A rotating assembly drives an auxiliary pipe to rotate circumferentially around the tower, and a displacement assembly adjusts the distance between the auxiliary pipe and the tower. This, combined with the perforated auxiliary pipe, creates an airflow disturbance vortex, enhancing the suppression of wind-induced vibration, effectively reducing tower fatigue damage, and extending the structural service life of the wind turbine hybrid tower. The specific technical solution is as follows: A device for reducing wind-induced vibration of a wind turbine hybrid tower is located at the bottom of the nacelle of the wind turbine hybrid tower and is arranged corresponding to the tower. It includes a rotating component and an auxiliary pipe arranged on the side of the tower away from the nacelle. One end of the auxiliary pipe is connected to the nacelle through a first displacement component, and the other end is connected to the rotating component through a second displacement component. Multiple holes are arranged at intervals on the auxiliary pipe. The auxiliary pipe can rotate around the tower along the circumference of the nacelle. When the wind turbine hybrid tower vibrates, the distance between the auxiliary pipe and the tower can be adjusted so that the airflow passing through the holes disturbs the tail vortex of the tower.

[0006] Furthermore, the wind power hybrid tower includes blades, with the device located on the side of the tower away from the blades, and the openings facing the side away from the tower.

[0007] Furthermore, it also includes a connecting rod, which is installed between the auxiliary pipe and the tower. One end of the connecting rod is connected to the nacelle, and the other end is connected to the rotating component.

[0008] Furthermore, it also includes a connected air pump assembly and air pump pipes. The air pump assembly includes a forward acceleration unit and a reverse acceleration unit installed in the cabin. Both the forward acceleration unit and the reverse acceleration unit are connected to the auxiliary pipes through the air pump pipes.

[0009] Furthermore, the first displacement assembly includes a first motor and a cable chain connected together, with an air pump pipe passing through the cable chain; the second displacement assembly includes a slide rail connected to the rotating assembly, a slider mounted on the slide rail, and a second motor connected to the slider, with the slider connected to an auxiliary pipe.

[0010] Furthermore, it also includes a processing module and a control module installed in the nacelle. The processing module is electrically connected to the monitoring module on the wind turbine to acquire the vibration displacement data of the wind turbine. Based on the vibration displacement data of the monitoring module, it determines whether the vibration displacement response of the wind turbine tower exceeds the limit. If it exceeds the limit, it acquires the vibration response frequency characteristic parameters. Based on the vibration response frequency characteristic parameters, it obtains the target position, target airflow direction, and target airflow rate of the auxiliary pipe and sends the command to the control module. The control module is used to control the first displacement component and the second displacement component to move the auxiliary pipe to the target position, and to control the air pump component. If the airflow direction is blowing, the forward acceleration unit works, and the orifice blows air to the outside of the auxiliary pipe at the target airflow rate. If the airflow direction is suction, the reverse acceleration unit works, and the orifice suctions air into the auxiliary pipe at the target airflow rate.

[0011] Furthermore, the rotating component includes an inner ring fitted on the tower and an outer ring fitted outside the inner ring. A sliding pair is provided between the outer ring and the inner ring. The slide rail and connecting rod of the second displacement component are both connected to the outer ring.

[0012] Furthermore, it also includes multiple flow meters installed on the auxiliary pipe. The auxiliary pipe has a main pipe inside, which is connected to each orifice. The multiple flow meters are installed one-to-one with the multiple orifices to control the gas flow rate through each orifice respectively.

[0013] Furthermore, the ratio of the diameter of the auxiliary pipe to the diameter of the tower is 1:10 to 3:10.

[0014] A method for reducing wind-induced vibration of a wind turbine tower, employing the aforementioned device for reducing wind-induced vibration of a wind turbine tower, includes the following steps: The nacelle drives the rotating components to rotate via connecting rods until the line connecting the tower and the auxiliary pipes is aligned with the direction of the main wind axis; The processing module receives tower vibration data transmitted by the monitoring module on the wind turbine and determines whether the vibration displacement exceeds the limit. If it does not exceed the limit, the first displacement component, the second displacement component, and the air pump component will not work. If the limit is exceeded, the decision system will automatically match and output the optimal control parameters. The control parameters include the target position of the auxiliary pipe, the target airflow direction and the target airflow rate. The first displacement component and the second displacement component drive the auxiliary pipe to move to the target position. The air pump component performs air intake or blowing according to the target airflow direction and the target airflow rate. The processing module acquires the tower vibration data again after the control is implemented, and determines whether the vibration response has been reduced to within the limit. If it has not met the standard, the control parameters are readjusted and the process is repeated. If it has met the standard, the air pump assembly stops working and enters continuous monitoring mode.

[0015] The device and method for reducing wind-induced vibration of wind turbine hybrid towers according to the present invention have the following advantages: 1. By rotating the auxiliary pipe around the tower circumference through the rotating component, and adjusting the distance between the auxiliary pipe and the tower by the first and second displacement components, the auxiliary pipe with the perforated part forms an airflow disturbance tail vortex. This eliminates the need to modify the original tower structure and avoids the risk of damage to the tower structure caused by existing technologies. At the same time, the dynamic adjustment capability of rotation and displacement can flexibly adapt to the position changes of the tail vortex under different wind conditions, allowing the airflow to precisely disturb the periodically falling tail vortex from the aerodynamic source, improve the wind-induced vibration suppression effect, effectively reduce tower fatigue damage, and extend the structural service life of wind power hybrid towers.

[0016] 2. The device is set on the side of the tower away from the blades, with the orifice facing away from the tower, so that the high-speed airflow through the orifice acts more directly on the core region of the wake vortex on the leeward side of the tower, reducing airflow loss and improving the accuracy and effectiveness of wake vortex disturbance.

[0017] 3. By setting a connecting rod between the nacelle and the rotating component, a rigid linkage relationship is established between the nacelle and the rotating component, so that the rotating component can rotate synchronously along the circumference of the tower following the rotation of the nacelle, thereby driving the auxiliary pipe to accurately align with the direction of the main wind axis, ensuring that the auxiliary pipe always covers the key area of ​​the wake vortex.

[0018] 4. The air pump assembly and air pump pipeline provide controllable airflow power for the auxiliary pipe. By switching between forward and reverse acceleration units, the two modes of intake and blowing can be flexibly switched. With the stable connection between the air pump pipeline and the auxiliary pipe, the continuity and rate controllability of airflow transmission are guaranteed. The air pump assembly is built into the nacelle, which does not damage the tower structure or interfere with the blade rotation, and avoids the wind resistance interference and loss of external power components.

[0019] 5. The synchronous displacement of both ends of the auxiliary pipe ensures the overall stability of the auxiliary pipe's posture, preventing the hole from deviating from the tail vortex region due to displacement deviation, and ensuring precise coverage of the vibration reduction effect; at the same time, the air pump pipeline is run through the drag chain, which not only provides movement guidance for the air pump pipeline, but also effectively prevents the pipeline from being pulled or bent during displacement, thus extending the service life of the equipment; the linkage design and concealed electrical connection between the first motor and the second motor do not occupy additional space or interfere with the operation of the fan, further improving the structural reliability and operational stability of the device.

[0020] 6. The processing module accurately judges the vibration state based on the wind turbine monitoring data, matches the optimal control parameters according to the database, and the control module executes parameter adjustment. It can dynamically adapt to different wind conditions and vibration states without manual intervention, which not only avoids energy waste caused by excessive vibration reduction, but also specifically suppresses vibrations of different frequencies, improving the accuracy and efficiency of vibration reduction. Attached Figure Description

[0021] Figure 1 This is a side cross-sectional view of the device for reducing wind-induced vibration of wind turbine towers according to the present invention.

[0022] Figure 2 This is a three-dimensional schematic diagram of the device for reducing wind-induced vibration of wind turbine towers according to the present invention.

[0023] Figure 3 This is a schematic diagram of the wind-induced vibration of the device for reducing wind-induced vibration of a wind turbine tower in this invention when it is not activated.

[0024] Figure 4 This is a schematic diagram of wind-induced vibration when the positive acceleration unit of the device for reducing wind-induced vibration of wind-powered hybrid towers in this invention is activated.

[0025] Figure 5 This is a schematic diagram of wind-induced vibration when the reverse acceleration unit is activated in the device for reducing wind-induced vibration of wind power hybrid towers according to the present invention.

[0026] Figure 6 This is a flowchart of the method for reducing wind-induced vibration of wind turbine hybrid towers according to the present invention. Detailed Implementation

[0027] To better understand the purpose, structure, and function of this invention, the following detailed description of a device and method for reducing wind-induced vibration of a wind turbine tower is provided in conjunction with the accompanying drawings.

[0028] like Figures 1 to 5As shown, the present invention provides a device for reducing wind-induced vibration of a wind turbine hybrid tower. The wind turbine hybrid tower includes a columnar tower 1, a nacelle 2 is provided at the top of the tower 1, and a blade 13 is provided at one end of the nacelle 2. The device is located at the bottom of the nacelle 2 of the wind turbine hybrid tower and is provided corresponding to the tower 1. The device includes a rotating component 3 provided on the side of the tower 1 away from the nacelle 2 and a hollow auxiliary tube 5. The rotating component 3 is used to drive the auxiliary tube 5 to rotate. A first displacement component 14 is provided at the bottom of the nacelle 2, and a second displacement component 4 is provided on the rotating component 3, which can rotate circumferentially along the tower 1 with the rotating component 3. One end of the auxiliary tube 5 is connected to the nacelle 2 through the first displacement component 14, and the other end is connected to the rotating component 3 through the second displacement component 4. The auxiliary tube 5 is provided with a plurality of holes 51 at intervals along its length.

[0029] In summary, the auxiliary pipe 5, via the rotating assembly 3, rotates circumferentially along the tower 1 as the nacelle 2 rotates. When the wind turbine tower vibrates, the distance between the auxiliary pipe 5 and the tower 1 is adjusted by the first displacement assembly 14 and the second displacement assembly 4, thereby accelerating the gas within the auxiliary pipe 5. This causes the orifice 51 to form a directional airflow that precisely disturbs the tail vortex of the tower 1, disrupting the periodic shedding of the tail vortex from its aerodynamic source, thus suppressing wind-induced vibration of the wind turbine tower. This device requires no modification to the original tower 1, adapting to different wind conditions and vibration states through dynamic adjustment of rotation and displacement. The airflow disturbance of the tail vortex is highly targeted, effectively reducing the impact of vibration on the tower 1 and extending the structural fatigue life of the wind turbine tower.

[0030] It should be noted that the wake vortex forms on the leeward side of tower 1, that is, on the side opposite to the direction of the incoming wind 15. Specifically, it is located in the wake region formed after the airflow passes through tower 1. It is the area where periodic shedding vortices accumulate when the tower 1 undergoes cylindrical flow under the action of the incoming flow. In this embodiment, the position of the wake vortex corresponds to the range of action of the auxiliary rod. The auxiliary rod is driven to rotate circumferentially around tower 1 by the rotating component 3, so that the auxiliary rod is always on the side of the wake vortex region 16 close to tower 1. The auxiliary rod draws in and blows air through the hole 51, which can directly act on the wake vortex in the wake region on the leeward side, thereby disturbing or destroying the wake vortex and suppressing wind-induced vibration.

[0031] Furthermore, the device is set on the side of the tower 1 away from the blade 13, and the orifice 51 is set on the side away from the tower 1, so that the rapid flow of air in the orifice 51 can act more directly on the wake region on the leeward side of the tower 1, thereby precisely disturbing or even destroying the periodic shedding wake vortex on the leeward side of the tower 1, cutting off the generation path of vortex-induced vibration from the aerodynamic root, and achieving targeted vibration reduction.

[0032] Furthermore, it also includes a connecting rod 6, which is set between the auxiliary pipe 5 and the tower 1. One end of the connecting rod 6 is connected to the bottom of the nacelle 2, and the other end is connected to the rotating component 3. The virtual axis parallel to the current prevailing wind direction 15 and running through the wind turbine tower 1 is defined as the main wind axis direction. The connecting rod 6 establishes a rigid linkage between the nacelle 2 and the rotating component 3, so that the rotating component 3 can follow the rotation of the nacelle 2 and rotate synchronously along the circumference of the tower 1. This, in turn, drives the connection between the auxiliary pipe 5 and the tower 1 to be parallel to the main wind axis direction. The setting of the connecting rod 6 ensures the synchronicity and positioning accuracy of the auxiliary pipe 5 as it rotates with the nacelle 2, adapts to the position changes of the wake vortex under different wind conditions, and is set between the auxiliary pipe 5 and the tower 1, so as not to interfere with the rotation of the blade 13, eliminating the need to modify the tower 1, improving the targeting and stability of vibration reduction, and effectively reducing fatigue damage to the tower 1.

[0033] Furthermore, such as Figure 1 , Figures 3 to 5 As shown, it also includes a connected air pump assembly and air pump pipe 11. The air pump assembly includes a forward acceleration unit 71 and a reverse acceleration unit 72 installed in the cabin 2. Both the forward acceleration unit 71 and the reverse acceleration unit 72 are connected to the auxiliary pipe 5 through the air pump pipe 11, and the air pump pipe 11 is connected to the main pipe 10 in the auxiliary pipe 5. The forward acceleration unit 71 blows air by connecting to the main pipe 10, and the reverse acceleration unit 72 draws air by connecting to the main pipe 10, thereby forming a directional and controllable airflow through the air pump assembly.

[0034] Furthermore, the first displacement component 14 includes a first motor and a drag chain 9 connected together. The air pump pipe 11 passes through the inside of the drag chain 9. The second displacement component 4 includes a slide rail 41 connected to the rotating component 3, a slider 42 set on the slide rail 41, and a second motor connected to the slider 42. The slider 42 is installed at the end of the auxiliary pipe 5. The second motor drives the slider 42 to move within the slide rail 41. The first motor and the second motor are electrically connected along the inside of the connecting rod 6 to drive the two ends of the auxiliary pipe 5 to maintain the same direction and synchronous displacement, thereby ensuring the overall stability of the auxiliary pipe 5 and avoiding displacement deviation that causes the hole 51 to deviate from the tail vortex region 16 on the leeward side of the tower 1. At the same time, the drag chain 9 can prevent the air pump pipe 11 from being pulled and damaged during the displacement process. Combined with the controllable airflow of the air pump component, the tail vortex disturbance effect is further enhanced, and the wind-induced vibration is effectively suppressed.

[0035] Furthermore, it also includes a control unit 8 installed in the nacelle 2. The control unit 8 includes a processing module and a control module. The processing module is electrically connected to the monitoring module on the wind turbine and is used to acquire the vibration displacement data of the wind turbine. Based on the vibration displacement data of the monitoring module, it determines whether the vibration displacement response of the wind turbine tower 1 exceeds the limit. If it exceeds the limit, it acquires the vibration response frequency characteristic parameters and transmits the vibration response frequency characteristic parameters to the decision system. The decision system is based on the database of integrated test and CFD numerical simulation, automatically matches and outputs the optimal target position, target airflow direction and target airflow rate of the auxiliary pipe 5, and then sends the command to the control module. The control module is used to control the first displacement component 14 and the second displacement component 4 to move the auxiliary pipe 5 to the target position, and to control the air pump component. If the airflow direction is blowing, the forward acceleration unit 71 works, and the orifice 51 blows air to the outside of the auxiliary pipe 5 according to the target airflow rate. If the airflow direction is suction, the reverse acceleration unit 72 works, and the orifice 51 suctions air into the auxiliary pipe 5 according to the target airflow rate.

[0036] The purpose of setting up the above structure is to build a closed-loop system of perception, decision-making and control, realize dynamic adaptive adjustment of vibration reduction parameters, accurately disturb the wake vortex from the aerodynamic root, improve the targeting and efficiency of vibration reduction through data-driven precision control, adapt to different wind conditions and vibration states in real time, and effectively suppress vortex-induced vibration.

[0037] Furthermore, such as Figure 2 As shown, the rotating assembly 3 includes an inner ring 17 detachably fitted onto the tower 1, and an outer ring 18 fitted around the inner ring 17. The slide rail 41 of the second displacement assembly 4 is fixed to the outer ring 18. The end of the connecting rod 6 is connected to the outer ring 18, so that the rotation of the nacelle 2 is transmitted through the connecting rod 6 to drive the outer ring 18 to rotate relative to the inner ring 17. Both the inner ring 17 and the outer ring 18 are half-jointed structures, assembled into a whole by bolts and other structures. The half-jointed structure can be easily fitted and matched with the structure of the tower 1. Sliding pairs are correspondingly provided between the inner ring 17 and the outer ring 18, so that the outer ring 18 can only rotate and cannot move up and down, and guides the inner ring 17 and the outer ring 18 to rotate relative to each other.

[0038] The rotating assembly 3 includes an inner ring 17 and an outer ring 18. The inner ring 17 is a detachable structure and is fitted onto the tower 1. Both the inner ring 17 and the outer ring 18 are designed to be spliced ​​in half, and are assembled into a complete structure by bolts and other components. This splicing method can easily achieve fitting and cooperation with the tower 1. The outer ring 18 is fitted onto the outside of the inner ring 17. The slide rail 41 of the second displacement assembly 4 is fixed on the outer ring 18, and the end of the connecting rod 6 is connected to the outer ring 18, so that when the nacelle 2 rotates, the connecting rod 6 can drive the outer ring 18 to rotate synchronously relative to the inner ring 17. A sliding pair is provided between the inner ring 17 and the outer ring 18, which can limit the vertical displacement of the outer ring 18 and only allow it to rotate circumferentially. At the same time, it can also guide the relative rotation of the inner ring 17 and the outer ring 18.

[0039] Preferably, it also includes multiple flow meters 12 installed on the auxiliary pipe 5. The main pipe 10 of the auxiliary pipe 5 is connected to each orifice 51. The multiple flow meters 12 are located on the upper edge of the orifice 51 and are installed one-to-one with the multiple orifices 51 to control the gas flow rate through each orifice 51 respectively. This allows the airflow flow rate of each orifice 51 to dynamically adapt to the uneven distribution characteristics of the tail vortex on the leeward side of the tower 1 along the height direction, avoiding the problem of insufficient or excessive local disturbance caused by a single flow rate, and realizing precise airflow disturbance in different areas of the tail vortex.

[0040] Preferably, the auxiliary pipe 5 can be set as a square or circular cylindrical pipe, and its length is determined according to the results of wind tunnel tests and CFD numerical simulations. The ratio of the diameter of the auxiliary pipe 5 to the diameter of the tower 1 is 1:10 to 3:10. This ensures that the auxiliary pipe 5 can effectively cover the key influence area of ​​the wake vortex, while avoiding the increase in its own volume and weight due to an excessively large ratio, which may interfere with the airflow of the wind turbine or increase the load on the displacement components. It also prevents the airflow disturbance intensity from being insufficient due to an excessively small ratio. Thus, under the premise of ensuring the suppression effect of vortex-induced vibration, the normal operation of the wind turbine is not affected and the burden on the tower 1 is not increased.

[0041] like Figure 6 As shown, the present invention also provides a method for reducing wind-induced vibration of wind turbine hybrid towers, which uses the above-mentioned device for reducing wind-induced vibration of wind turbine hybrid towers, specifically including the following steps: Step 1: Based on the wind direction data obtained by the monitoring module on the wind turbine, the nacelle 2 drives the rotating component 3 to rotate around the tower 1 circumferentially through the connecting rod 6 until the line connecting the tower 1 and the auxiliary pipe 5 is aligned with the direction of the main wind axis, that is, parallel to the main wind axis.

[0042] Step 2: The processing module receives the vibration data of tower 1 transmitted by the monitoring module of the wind turbine, performs wind-induced vibration judgment of tower 1, and checks whether the vibration displacement exceeds the safety limit or preset limit. If the vibration does not occur or the amplitude is small, the first displacement component 14, the second displacement component 4, and the air pump component will not work. If a large amplitude vibration is detected, the vibration response frequency characteristics will be extracted immediately and the intelligent control process will be started.

[0043] Step 3: Transmit parameters such as the vibration characteristics of tower 1 to the decision system. This system, based on the database of integrated testing and CFD numerical simulation, automatically matches and outputs the optimal combination of target position, target airflow direction, and target airflow rate for auxiliary pipe 5.

[0044] Step 4: The control module issues instructions to the moving component, driving the auxiliary tube 5 to move to the target position determined in Step 3.

[0045] Step 5: After the auxiliary pipe 5 is in place, the control module starts the air pump assembly. If the target airflow direction is blowing, the forward acceleration unit 71 is activated to blow air out of the auxiliary pipe 5 at a controllable rate through the orifice 51. If the target airflow direction is inhalation, the reverse acceleration unit 72 is activated to draw air into the auxiliary pipe 5 at a controllable rate through the orifice 51, thereby disrupting the alternating shedding of the tail vortex of the tower 1 and suppressing the vibration of the tower 1.

[0046] Step Six: The processing module acquires the vibration data of tower 1 after the control is implemented again and determines whether the vibration response has been reduced to within the limit. If it has not met the standard, it returns to Step Three, readjusts the control parameters and executes the cycle until the optimal parameter combination is found. If it has met the standard, the air pump assembly stops working and returns to Step Two to enter the continuous monitoring state.

[0047] In summary, the device and method for reducing wind-induced vibration of wind turbine hybrid towers provided by the present invention have the following advantages: This device, by incorporating a rotating assembly, a displacement assembly, an auxiliary pipe, a connecting rod, a control module, a processing module, and an air pump assembly, can dynamically optimize multiple parameters such as the position of the auxiliary pipe, airflow direction, and suction / blowing rate. This forms a real-time feedback and adaptive adjustment active control loop, significantly improving the suppression of wind-induced vibration in the tower structure and the overall system control performance. It also prevents fatigue damage caused by long-term vibration, extending the service life of the tower structure. Furthermore, this device requires no modification to the existing tower, facilitating engineering promotion and application.

[0048] The terms “above,” “below,” and “within” as used above include the number itself; the terms “exceeding” and “excluding” do not include the number itself.

[0049] The present invention has been further described above with reference to specific embodiments. However, it should be understood that the specific descriptions herein should not be construed as limiting the substance and scope of the present invention. Various modifications made to the above embodiments by those skilled in the art after reading this specification are all within the scope of protection of the present invention. The various specific technical features described in the above embodiments can be combined in any suitable manner without contradiction. To avoid unnecessary repetition, the embodiments of the present invention will not further describe various possible combinations.

[0050] If the embodiments of the present invention involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

Claims

1. A device for reducing wind-induced vibration of a wind turbine hybrid tower, located at the bottom of the nacelle of the wind turbine hybrid tower and corresponding to the tower body, characterized in that, The system includes a rotating assembly mounted on the side of the tower away from the nacelle, an auxiliary pipe, and a connecting rod positioned between the auxiliary pipe and the tower. One end of the connecting rod is connected to the nacelle, and the other end is connected to the rotating assembly. One end of the auxiliary pipe is connected to the nacelle via a first displacement assembly, and the other end is connected to the rotating assembly via a second displacement assembly. The first motor of the first displacement assembly and the second motor of the second displacement assembly are electrically connected along the inside of the connecting rod to drive the two ends of the auxiliary pipe to maintain unidirectional and synchronous displacement. Multiple orifices are sequentially spaced on the auxiliary pipe. The system also includes multiple flow meters mounted on the auxiliary pipe. The auxiliary pipe has a main pipe inside, which communicates with each orifice. The multiple flow meters are correspondingly set with each orifice to control the gas flow rate through each orifice. The auxiliary pipe can rotate circumferentially around the tower along with the nacelle. When the wind turbine tower vibrates, the distance between the auxiliary pipe and the tower can be adjusted to allow the airflow passing through the orifices to disturb the tower's wake vortex.

2. The device for reducing wind-induced vibration of wind turbine towers as described in claim 1, characterized in that, The wind turbine hybrid tower includes blades, and the device is located on the side of the tower away from the blades, with the opening facing the side away from the tower.

3. The device for reducing wind-induced vibration of wind turbine towers as described in claim 1, characterized in that, It also includes a connected air pump assembly and air pump pipes. The air pump assembly includes a forward acceleration unit and a reverse acceleration unit installed in the cabin. Both the forward acceleration unit and the reverse acceleration unit are connected to the auxiliary pipes through the air pump pipes.

4. The device for reducing wind-induced vibration of wind turbine towers as described in claim 3, characterized in that, The first displacement assembly includes a first motor and a cable chain connected together, with an air pump pipe passing through the cable chain. The second displacement assembly includes a slide rail connected to a rotating assembly, a slider mounted on the slide rail, and a second motor connected to the slider. The slider is connected to an auxiliary pipe.

5. The device for reducing wind-induced vibration of wind turbine towers as described in claim 3, characterized in that, It also includes a processing module and a control module installed in the nacelle. The processing module is electrically connected to the monitoring module on the wind turbine to acquire the vibration displacement data of the wind turbine. Based on the vibration displacement data of the monitoring module, it determines whether the vibration displacement response of the wind turbine tower exceeds the limit. If it exceeds the limit, it acquires the vibration response frequency characteristic parameters. Based on the vibration response frequency characteristic parameters, it obtains the target position, target airflow direction, and target airflow rate of the auxiliary pipe and sends the command to the control module. The control module is used to control the first displacement component and the second displacement component to move the auxiliary pipe to the target position, and to control the air pump component. If the airflow direction is blowing, the forward acceleration unit works, and the orifice blows air to the outside of the auxiliary pipe at the target airflow rate. If the airflow direction is suction, the reverse acceleration unit works, and the orifice suctions air into the auxiliary pipe at the target airflow rate.

6. The device for reducing wind-induced vibration of wind turbine towers as described in claim 4, characterized in that, The rotating assembly includes an inner ring fitted on the tower and an outer ring fitted outside the inner ring. A sliding pair is provided between the outer ring and the inner ring. The slide rail and connecting rod of the second displacement assembly are both connected to the outer ring.

7. The device for reducing wind-induced vibration of wind turbine towers as described in any one of claims 1 to 6, characterized in that, The ratio of the diameter of the auxiliary pipe to the diameter of the tower is 1:10 to 3:

10.

8. A method for reducing wind-induced vibration of a wind turbine tower, comprising the apparatus for reducing wind-induced vibration of a wind turbine tower as described in any one of claims 1 to 7, characterized in that, Includes the following steps: The nacelle drives the rotating components to rotate via connecting rods until the line connecting the tower and the auxiliary pipes is aligned with the direction of the main wind axis; The processing module receives tower vibration data transmitted by the monitoring module on the wind turbine and determines whether the vibration displacement exceeds the limit. If it does not exceed the limit, the first displacement component, the second displacement component, and the air pump component will not work. If the limit is exceeded, the decision system will automatically match and output the optimal control parameters. The control parameters include the target position of the auxiliary pipe, the target airflow direction and the target airflow rate. The first displacement component and the second displacement component drive the auxiliary pipe to move to the target position. The air pump component performs air intake or blowing according to the target airflow direction and the target airflow rate. The processing module acquires the tower vibration data again after the control is implemented, and determines whether the vibration response has been reduced to within the limit. If it has not met the standard, the control parameters are readjusted and the process is repeated. If it has met the standard, the air pump assembly stops working and enters continuous monitoring mode.

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