Wind power tower device and vibration reduction and reinforcement method thereof

Abstract

The application discloses a wind power tower device and a damping and reinforcing method thereof, and belongs to the technical field of wind power tower devices. The wind power tower device comprises a tower and a plurality of sets of damping and reinforcing mechanisms. The inner wall of the tower is uniformly provided with a plurality of longitudinal convex ribs. A reinforcing plate and an elastic cushion layer are arranged between every two adjacent longitudinal convex ribs. Each set of damping and reinforcing mechanism comprises a main connecting seat and two sets of servo elastic supports. The main connecting seat is connected with the longitudinal convex rib. Each reinforcing plate is supported by two servo elastic supports in the adjacent set of damping and reinforcing mechanism, so that the reinforcing plate is pressed against the elastic cushion layer. The servo elastic support comprises a fixed sleeve, a sliding sleeve, an elastic buffer and an actuator. When the servo elastic support is in a buffering and damping state, the actuator is in a closed state, the elastic buffer absorbs energy and damps to offset the vibration of the tower. When the servo elastic support is in a reinforcing and supporting state, the actuator is in a working state and pushes against the sliding sleeve to improve the structural rigidity of the tower and reduce the sway.

Description

Technical Field

[0001] This invention relates to the field of wind turbine tower technology, and in particular to a wind turbine tower device and its vibration reduction and reinforcement method. Background Technology

[0002] The wind turbine tower is the main body of a wind turbine generator, with the fan blades mounted at the top. Due to its considerable height, the wind turbine tower requires reinforcement and vibration damping to meet reliability requirements.

[0003] In existing technologies, a central column is typically installed at the center of the wind turbine tower, a reinforcing plate is welded to the inner surface of the wind turbine tower, and multiple sets of vibration dampers are installed between the central column and the reinforcing plate, with the multiple sets of vibration dampers arranged around the circumference of the central column.

[0004] The drawbacks of existing technology are that it requires a central support column, involves many installation steps, and is costly. It also requires welding reinforcing plates to the inner surface of the wind turbine tower, which increases the installation steps. The welding process can also damage the wall of the wind turbine tower. The reinforcing plates are in rigid contact with the wall of the wind turbine tower. When the vibration damper operates by expanding and contracting, the force will be directly reflected onto the wall of the wind turbine tower, which will also cause damage to the wall of the wind turbine tower.

[0005] Therefore, it is necessary to provide a new type of wind turbine tower device and its vibration reduction and reinforcement method. Summary of the Invention

[0006] The purpose of this invention is to provide a novel wind turbine tower device and its vibration reduction and reinforcement method. The main connecting seat of the vibration reduction and reinforcement mechanism is installed on the longitudinal rib on the inner side of the tower, thus eliminating the need to install a central column. The two sets of servo elastic supports of the vibration reduction and reinforcement mechanism are arranged in a Y-shape to connect with two reinforcing plates located on the longitudinal rib. Each reinforcing plate is provided with an elastic pad between itself and the tower. Each reinforcing plate is supported by two servo elastic supports in the two adjacent sets of vibration reduction and reinforcement mechanisms, thereby pressing the reinforcing plate tightly against the elastic pad. This eliminates the need to weld the reinforcing plate to the tower, saving process steps and avoiding rigid contact between the reinforcing plate and the tower wall, thus overcoming the shortcomings of the prior art.

[0007] The present invention provides a wind turbine tower device, including a tower and multiple sets of vibration damping and reinforcement mechanisms disposed inside the tower and evenly distributed along the circumference of the tower.

[0008] The inner wall of the tower is evenly distributed with multiple longitudinal ribs at intervals along the circumference. An arc-shaped reinforcing plate is arranged between every two adjacent longitudinal ribs, and an elastic pad is arranged between each reinforcing plate and the tower.

[0009] Each of the vibration damping and reinforcement mechanisms includes a main connecting seat fixedly connected to one of the longitudinal ribs and two sets of servo elastic supports arranged on opposite sides of the main connecting seat and respectively hinged to the main connecting seat.

[0010] The two sets of servo elastic supports are respectively hinged to the two reinforcing plates on both sides of the longitudinal convex rib. Each reinforcing plate is supported by two servo elastic supports in the two adjacent sets of vibration damping and reinforcement mechanisms, so that the reinforcing plate presses the elastic pad layer.

[0011] The servo elastic support includes a fixed sleeve, a sliding sleeve that is slidably connected to the fixed sleeve and hinged to the reinforcing plate, an elastic buffer connected between the fixed sleeve and the sliding sleeve, and an actuator disposed in the fixed sleeve for ejecting the sliding sleeve.

[0012] When the servo elastic support is in the buffer and vibration reduction state, the actuator is in the off state, and the elastic buffer absorbs energy and reduces vibration to counteract the vibration of the tower.

[0013] When the servo elastic support is in a reinforced support state, the actuator is in working state and presses against the sliding sleeve to improve the structural rigidity of the tower and reduce swaying.

[0014] In one of the alternative technical solutions, the fixed sleeve is provided with a pusher for driving the sliding sleeve to retract;

[0015] When the pusher is in the initial state, the push rod of the pusher is in the retracted state and separated from the sliding sleeve. When the servo elastic support is in the buffering and vibration reduction state and the reinforcement support state, the pusher is in the initial state.

[0016] When the pusher is in operation, the push rod is extended and pushes the sliding sleeve to retract, causing the reinforcing plate to move toward the inner side of the tower wall, thereby reducing the structural stiffness and vibration frequency of the tower.

[0017] In one of the alternative technical solutions, a vibration sensor is provided inside the end of the sliding sleeve facing the reinforcing plate;

[0018] And / or, a first displacement sensor for monitoring the displacement of the sliding sleeve is provided on the inner or outer side of the fixed sleeve.

[0019] In one of the alternative technical solutions, a pressure-bearing sliding plate is connected to one end of the sliding sleeve inside the fixed sleeve, and the pressure-bearing sliding plate is slidably connected to the cylinder wall of the fixed sleeve.

[0020] The elastic buffer is connected between the pressure-bearing sliding plate and the top cover of the fixed sleeve;

[0021] The actuator and the sliding sleeve are located on opposite sides of the pressure-bearing sliding plate, and the actuator is capable of lifting the pressure-bearing sliding plate.

[0022] In one of the alternative technical solutions, a limiting ring is provided inside the fixed sleeve, and the limiting ring is located between the pressure-bearing sliding plate and the top cover;

[0023] When the sliding sleeve extends to its maximum distance, the pressure-bearing sliding plate is blocked by the limiting ring.

[0024] In one of the alternative technical solutions, the actuator includes a telescopic end extending toward the pressure-bearing sliding plate and a driving part for driving the telescopic end to extend, retract, or slide.

[0025] A pressure sensor is provided on the end face of the telescopic end facing the pressure-bearing sliding plate and / or on the bottom surface of the pressure-bearing sliding plate facing the telescopic end.

[0026] In one of the alternative technical solutions, a second displacement sensor for monitoring the displacement of the telescopic end is provided inside the fixed sleeve.

[0027] The present invention also provides a vibration reduction and reinforcement method for wind turbine tower devices, comprising the following steps:

[0028] S01: Monitor the vibration and swaying status of the tower;

[0029] S02: If the sway amplitude of the tower is within the sway warning value, the actuator remains off, the servo elastic support is in a buffer and vibration reduction state, and the elastic buffer absorbs energy and reduces vibration to counteract the vibration of the tower.

[0030] If the sway amplitude of the tower exceeds the sway warning value, the actuator is in working state and presses against the sliding sleeve, and the servo elastic support is in a reinforced support state to improve the structural rigidity of the tower and reduce sway.

[0031] In one of the alternative technical solutions, the vibration reduction and reinforcement method for wind turbine tower installations further includes the following steps:

[0032] The actuator is in working condition and presses against the sliding sleeve, while the servo elastic support is in a reinforced support state to improve the structural rigidity and vibration frequency of the tower, so as to avoid the vibration frequency generated by the wind turbine.

[0033] In one of the alternative technical solutions, the vibration reduction and reinforcement method for wind turbine tower installation includes the following steps:

[0034] The actuator is in its initial state, and the pusher inside the fixed sleeve is in its working state, pushing the sliding sleeve to retract, so that the reinforcing plate moves toward the inner side of the tower wall to reduce the structural stiffness and vibration frequency of the tower, so as to avoid the vibration frequency generated by the wind turbine.

[0035] The above technical solution has the following beneficial effects:

[0036] The wind turbine tower device and its vibration reduction and reinforcement method provided by this invention have several longitudinal ribs on the inner surface of the tower. An arc-shaped reinforcing plate is provided between every two longitudinal ribs, and an elastic pad is provided between the reinforcing plate and the inner surface of the tower. The main connecting seat of the vibration reduction and reinforcement mechanism is installed on the longitudinal ribs on the inner side of the tower, thus eliminating the need for a central column. The two sets of servo elastic supports of the vibration reduction and reinforcement mechanism are arranged in a Y-shape to connect with the two reinforcing plates located on the longitudinal ribs. Each reinforcing plate is supported by two servo elastic supports in two adjacent sets of vibration reduction and reinforcement mechanisms, thus eliminating the need to weld the reinforcing plate to the tower, saving steps. Due to the action of the two servo elastic supports, the reinforcing plate is pressed tightly onto the elastic pad, preventing rigid contact between the reinforcing plate and the tower wall.

[0037] The servo-driven elastic support includes a fixed sleeve, a sliding sleeve, an elastic buffer, and an actuator. The sliding sleeve extends relative to the fixed sleeve and is hinged to the reinforcing plate. The elastic buffer connects the fixed sleeve and the sliding sleeve to buffer and reduce vibration. The actuator is used to lift the sliding sleeve when there is severe shaking, keeping the sliding sleeve in the extended state to support the reinforcing plate, thereby improving the structural rigidity of the tower, reducing shaking, and enhancing the reliability of the tower. Attached Figure Description

[0038] The disclosure of this invention will become more readily understood by referring to the accompanying drawings. It should be understood that these drawings are for illustrative purposes only and are not intended to limit the scope of protection of this invention. In the drawings:

[0039] Figure 1 This is a perspective view of a wind turbine tower device provided in an embodiment of the present invention;

[0040] Figure 2 for Figure 1 A magnified view of a portion of the image;

[0041] Figure 3 This is a cross-sectional view of a wind turbine tower assembly provided in an embodiment of the present invention;

[0042] Figure 4 for Figure 3 A cross-sectional view along direction AA;

[0043] Figure 5 for Figure 4A magnified view of a portion of the image;

[0044] Figure 6 This is a cross-sectional view of a servo-flexible support, where the actuator and pusher are both in their initial state;

[0045] Figure 7 This is a cross-sectional view of a servo elastic support, in which the actuator is in its initial state, and the telescopic end of the actuator extends along arrow A to push the pressure-bearing sliding plate;

[0046] Figure 8 This is a cross-sectional view of a servo elastic support, where the actuator is in its initial state and the sliding sleeve is pushed out along arrow B by the actuator.

[0047] Figure 9 This is a cross-sectional view of a servo elastic support, where the actuator is in its initial state and the sliding sleeve is pushed back along arrow C by the pusher;

[0048] Figure 10 This is a schematic diagram of Campbell's frequency for the tower. Detailed Implementation

[0049] The specific embodiments of the present invention will be further described below with reference to the accompanying drawings. Identical components are indicated by the same reference numerals. It should be noted that the terms "front," "rear," "left," "right," "up," and "down" used in the following description refer to directions in the accompanying drawings, while the terms "inner" and "outer" refer to directions toward or away from the geometric center of a specific component, respectively.

[0050] like Figure 1-8 As shown, an embodiment of the present invention provides a wind turbine tower device, including a tower 1 and multiple sets of vibration damping and reinforcement mechanisms 2 disposed inside the tower 1 and evenly distributed along the circumference of the tower 1.

[0051] The inner wall of the tower 1 has multiple longitudinal ribs 11 evenly distributed along the circumference. An arc-shaped reinforcing plate 3 is provided between every two adjacent longitudinal ribs 11, and an elastic pad 4 is provided between each reinforcing plate 3 and the tower 1.

[0052] Each vibration damping and reinforcement mechanism 2 includes a main connecting seat 21 fixedly connected to a longitudinal rib 11 and two sets of servo elastic supports 22 arranged on opposite sides of the main connecting seat 21 and respectively hinged to the main connecting seat 21.

[0053] Two sets of servo elastic supports 22 are respectively hinged to two reinforcing plates 3 on both sides of the longitudinal rib 11. Each reinforcing plate 3 is supported by two servo elastic supports 22 in two adjacent sets of vibration damping and reinforcement mechanisms 2, so that the reinforcing plate 3 presses the elastic pad 4.

[0054] The servo elastic support 22 includes a fixed sleeve 221, a sliding sleeve 222 that is slidably connected to the fixed sleeve 221 and hinged to the reinforcing plate 3, an elastic buffer 223 connected between the fixed sleeve 221 and the sliding sleeve 222, and an actuator 224 disposed in the fixed sleeve 221 and used to push out the sliding sleeve 222.

[0055] When the servo elastic support 22 is in the buffer and vibration reduction state, the actuator 224 is in the off state, and the elastic buffer 223 absorbs energy and reduces vibration to counteract the vibration of the tower 1.

[0056] When the servo elastic support 22 is in a reinforced support state, the actuator 224 is in working state and presses against the sliding sleeve 222 to improve the structural rigidity of the tower 1 and reduce swaying.

[0057] The wind turbine tower device provided by the present invention includes a tower 1, multiple sets of vibration reduction and reinforcement mechanisms 2, multiple reinforcing plates 3, and multiple elastic pads 4.

[0058] The inner surface of the tower 1 is provided with multiple longitudinal ribs 11 at intervals. The longitudinal ribs 11 extend along the axial direction of the tower 1, and the multiple longitudinal ribs 11 are evenly distributed along the circumference of the tower 1. The longitudinal ribs 11 are preferably integrally formed with the wall of the tower 1. There is a groove between two adjacent longitudinal ribs 11 for assembling the elastic pad 4 and the reinforcing plate 3.

[0059] The number of vibration damping and reinforcement mechanisms 2, reinforcing plates 3, and elastic pads 4 are the same as the number of longitudinal ribs 11. Taking the example of three longitudinal ribs 11 spaced apart on the inner surface of the tower 1, the wind turbine tower device includes three sets of vibration damping and reinforcement mechanisms 2, three reinforcing plates 3, and three elastic pads 4.

[0060] The reinforcing plate 3 and the elastic pad 4 are both arc-shaped. The reinforcing plate 3 is preferably a steel plate, and the elastic pad 4 is preferably a rubber pad. The elastic pad 4 is bonded to the outer surface of the reinforcing plate 3 to form a reinforcing plate-elastic pad assembly. During assembly, a reinforcing plate-elastic pad assembly is arranged in the groove between every two adjacent longitudinal ribs 11, and the elastic pad 4 is sandwiched between the reinforcing plate 3 and the cylinder wall of the tower 1.

[0061] The vibration damping and reinforcement mechanism 2 serves both vibration damping and reinforcement functions. It includes a main connecting seat 21 and two sets of servo elastic supports 22. The main connecting seat 21 is fixedly connected to the longitudinal rib 11, for example, by welding. The two sets of servo elastic supports 22 are arranged on opposite sides of the main connecting seat 21 in a fork-shaped or Y-shaped structure. The first ends of the two sets of servo elastic supports 22 are hinged to the main connecting seat 21, and the ends of the two sets of servo elastic supports 22 are hinged to two reinforcing plates 3 located on both sides of the longitudinal rib 11. Thus, each reinforcing plate 3 is supported by two servo elastic supports 22 in the two adjacent sets of vibration damping and reinforcement mechanisms 2, which allows the reinforcing plate 3 to press the elastic pad 4, ultimately pressing the elastic pad 4 onto the inner surface of the tower 1.

[0062] The servo elastic bracket 22 can provide cushioning and vibration reduction through telescopic movement, and can also provide reinforcement through fixed support.

[0063] The main connecting seat 21 of each vibration damping and reinforcement mechanism 2 is fixedly installed on a longitudinal rib 11, and the multiple main connecting seats 21 of multiple vibration damping and reinforcement mechanisms 2 are respectively installed on multiple longitudinal ribs 11 one by one. The two sets of servo elastic supports 22 of each vibration damping and reinforcement mechanism 2 are respectively hinged to the two reinforcing plates 3 on both sides, so that each of the multiple reinforcing plates 3 is supported by a set of servo elastic supports 22 of the adjacent vibration damping and reinforcement mechanism 2. The servo elastic supports 22 are in the extended state under normal conditions, so that the two sets of servo elastic supports 22 support the reinforcing plates 3 and apply pressure to the reinforcing plates 3, so that the elastic pad 4 is pressed tightly against the inner surface of the tower 1. When the tower 1 vibrates, the pressed elastic pad 4 also provides a certain buffering and vibration damping effect, and can also avoid rigid contact friction between the reinforcing plates 3 and the cylinder wall of the tower 1.

[0064] The servo elastic support 22 includes a fixed sleeve 221, a sliding sleeve 222, an elastic buffer 223, and an actuator 224.

[0065] One end of the sliding sleeve 222 is slidably fitted inside the fixed sleeve 221, while the other end extends outward from the fixed sleeve 221 and is hinged to a reinforcing plate 3. The elastic buffer 223, which can be a spring, is fitted between the fixed sleeve 221 and the sliding sleeve 222, providing a certain elastic driving force for the outward extension of the sliding sleeve 222, so that the sliding sleeve 222 is in the extended state when the servo elastic support 22 is in its initial state. Thus, when the tower 1 vibrates, the sliding sleeve 222 can adaptively generate a certain amount of extension and retraction. The elastic buffer 223 reacts during the extension and retraction of the sliding sleeve 222, absorbing energy and providing a buffering effect to counteract the vibration of the tower 1.

[0066] The actuator 224 is located inside the fixed sleeve 221. It adopts an electrically or hydraulically controlled telescopic mechanism to push out the sliding sleeve 222 when the tower 1 shakes, so as to prevent it from retracting, improve the support effect, enhance the rigidity of the connection structure, and thus improve the structural rigidity of the tower 1 wall and reduce shaking.

[0067] Specifically, since the vibration damping and reinforcement mechanism 2 is connected between the longitudinal rib 11 of the tower 1 and the reinforcing plate 3 on the inner side of the tower 1, when the actuator 224 works, it causes the sliding sleeve 222 to be pushed out and no longer retract, thereby improving the structural stability between the longitudinal rib 11 and the reinforcing plate 3. The longitudinal rib 11 and the reinforcing plate 3 act on the cylinder wall of the tower 1 respectively, ultimately improving the structural stiffness of the cylinder wall of the tower 1 and reducing swaying.

[0068] As needed, multiple tilt sensors or distance sensors can be arranged at intervals around the circumference of the tower 1. When the maximum tilt angle or maximum sway distance of the tower 1 exceeds the preset safety value, it indicates that the sway amplitude of the tower 1 exceeds the sway warning value. At this time, the actuator 224 starts working and presses against the sliding sleeve 222. The servo elastic support 22 is in a reinforced support state to improve the structural rigidity of the tower 1 and reduce sway.

[0069] If the height of tower 1 is L, the maximum horizontal sway distance is ΔL, the elastic modulus of the tower steel plate is E, and σ is the yield strength of the tower steel plate material, σ 0.2 This is a correction for the yield strength of materials with different plate thicknesses, calculated using the stress-strain relationship:

[0070]

[0071] Of course, as needed, a control device, such as a controller, chip, or computer, can be configured outside or inside the tower 1 to receive signals from various sensors and to control the switching of the actuator 224.

[0072] The vibration reduction and reinforcement methods for wind turbine tower installations are roughly as follows:

[0073] The first step is to monitor the vibration and swaying of tower 1.

[0074] In the second step, if the swaying amplitude of tower 1 is within the sway warning value, the actuator 224 remains closed during the vibration of tower 1, the servo elastic support 22 is in a buffer and vibration reduction state, and the sliding sleeve 222 will adaptively extend and retract with the vibration. The extended and retracted sliding sleeve 222 reacts to the elastic buffer 223, which absorbs energy and reduces vibration to counteract the vibration of tower 1.

[0075] If the sway amplitude of tower 1 exceeds the sway warning value, actuator 224 is activated. Actuator 224 presses against sliding sleeve 222, preventing sliding sleeve 222 from retracting as much as possible. Servo elastic support 22 is in a reinforced support state to improve the structural rigidity of tower 1 and reduce sway. In summary, the wind turbine tower device provided by the present invention has several longitudinal ribs 11 on the inner surface of tower 1, an arc-shaped reinforcing plate 3 between every two longitudinal ribs 11, and an elastic pad 4 between the reinforcing plate 3 and the inner surface of tower 1. The main connecting seat 21 of the vibration damping and strengthening mechanism 2 is installed on the longitudinal rib 11 inside the tower 1, so that the central column does not need to be installed. The two sets of servo elastic supports 22 of the vibration damping and strengthening mechanism 2 are arranged in a Y shape to connect with the two reinforcing plates 3 located on the longitudinal rib 11. Each reinforcing plate 3 is supported by two servo elastic supports 22 in the two adjacent sets of vibration damping and strengthening mechanisms 2, so that the reinforcing plate 3 does not need to be welded to the tower 1, saving the process. Due to the action of the two servo elastic supports 22, the reinforcing plate 3 is pressed on the elastic pad 4, which can avoid the rigid contact between the reinforcing plate 3 and the cylinder wall of the tower 1.

[0076] The servo elastic support 22 includes a fixed sleeve 221, a sliding sleeve 222, an elastic buffer 223, and an actuator 224. The sliding sleeve 222 extends relative to the fixed sleeve 221 and is hinged to the reinforcing plate 3. The elastic buffer 223 connects between the fixed sleeve 221 and the sliding sleeve 222 to buffer and dampen vibration. The actuator 224 is used to lift the sliding sleeve 222 when there is severe shaking, keeping the sliding sleeve 222 in an extended state to support the reinforcing plate 3, thereby improving the structural rigidity of the tower 1, reducing shaking, and improving the reliability of the tower 1.

[0077] The tower 1 is equipped with a wind turbine consisting of one or more blades. The rotation of the wind turbine generates vibrations, which are transmitted to the tower 1. The vibration frequency of the wind turbine varies depending on the number of blades. Generally, the vibration frequency generated by a single blade during wind turbine rotation is called the lower-order frequency, denoted by 1P, while the vibration frequency generated by a wind turbine with multiple blades is called the higher-order frequency, denoted by nP, where n is a natural number greater than or equal to 2; typically, n is 2 or 3.

[0078] The frequency generated by the rotation of the wind turbine is also related to its rotation speed. The higher the rotation speed, the higher the vibration frequency, and the lower the rotation speed, the lower the vibration frequency.

[0079] The frequency generated by the rotation of the wind turbine can be obtained by a vibration sensor installed on the wind turbine.

[0080] Figure 10This is a Campbell's diagram illustrating the tower's frequency. 1P represents the lower-order frequency, 3P the higher-order frequency, the cut-in speed refers to the rotor speed at which the generator reaches its minimum operating speed, and the rated speed refers to the fan blade speed at which it reaches a specified speed. The natural frequency range of the steel tower refers to the range of its own vibration frequencies. The upper and lower lines of this range represent the approximate intervals where resonance with the tower 1 is possible. If the rotor's rotation frequency falls within this range, the probability of resonance in the tower 1 is relatively high, and it is best to avoid this interval. Therefore, this interval can be called the resonance frequency range or the frequency avoidance range. Figure 10 The resonant frequency range or frequency avoidance range shown below is called the low resonant frequency range. Figure 10 The resonant frequency range or frequency avoidance range shown above is called the high resonant frequency range.

[0081] When the vibration generated by the wind turbine on the tower 1 is outside the resonant frequency range or the frequency avoidance range, the energy is mainly absorbed and buffered by the elastic buffer 223 of the vibration damping and reinforcement mechanism 2.

[0082] When the vibration generated by the wind turbine on the tower 1 is within or close to the resonant frequency range or frequency avoidance range, it is necessary to change the rigidity or stiffness of the tower 1 to change the vibration frequency of the tower 1, thereby avoiding the vibration frequency of the wind turbine and thus preventing resonance.

[0083] There are two ways to change the rigidity or stiffness of tower 1 to avoid the high resonant frequency range and the low resonant frequency range:

[0084] If the wind turbine generates vibrations at low-order frequencies, for example, Figure 10 As shown by line 1P, the initial frequency of the low-order frequency segment is lower than the vibration frequency of tower 1. Towards the end of the low-order frequency segment, it reaches the low-resonance frequency range and also the inherent vibration frequency of tower 1. Therefore, the rigidity or stiffness of tower 1 does not need to be changed during the initial and middle stages of wind turbine rotation. When the final stage of the low-order frequency segment gradually increases and approaches the low-resonance frequency range, the rigidity or stiffness of tower 1 is increased to raise its vibration frequency and increase the lower limit of the low-resonance frequency range, thus avoiding the final stage of the low-order frequency segment.

[0085] If the wind turbine generates vibrations at high-order frequencies, for example, Figure 10 As shown by line 3P, the initial segment of the higher-order frequency coincides with the vibration frequency of tower 1, and then gradually exceeds the high resonant frequency range. Therefore, at the beginning of the wind turbine rotation, it is necessary to weaken the rigidity or stiffness of tower 1 to reduce the vibration frequency of tower 1, thereby avoiding the initial segment of the higher-order frequency, until the higher-order frequency exceeds the high resonant frequency range, and then restore the rigidity or stiffness of tower 1.

[0086] For example: Assuming the generator cut-in speed is 1200 r / min, the rated speed is 1800 r / min, and the gearbox speed ratio is 200, the calculated cut-in speed frequency of 1P is 0.1 Hz, the rated speed frequency of 1P is 0.15 Hz, the cut-in speed frequency of 3P is 0.3 Hz, and the rated speed frequency of 3P is 0.45 Hz. In order to avoid the resonance frequency range, the allowable frequency range of tower 1 should be 0.167 Hz - 0.272 Hz.

[0087] If the vibration frequency generated by the wind turbine is a low-order frequency, then when the wind turbine speed is low, its vibration frequency is low and far below the low resonance frequency range. When the wind turbine speed is high, it may gradually approach or exceed the low resonance frequency range. At this time, the frequency of the tower 1 can be increased by increasing the rigidity or stiffness of the tower 1.

[0088] If the vibration frequency generated by the wind turbine is a high-order frequency, when the wind turbine speed is low, its vibration frequency is also relatively low, below the high resonance frequency range, but within the natural frequency range of tower 1 itself. In this case, the frequency of tower 1 can be reduced by reducing the rigidity or stiffness of tower 1, thereby reducing the upper limit of the high resonance frequency range.

[0089] Lowering the upper limit of the high resonant frequency range has the following two effects:

[0090] The first method ensures that the upper limit of the high resonant frequency range is lower than the vibration frequency generated by the wind turbine, thereby completely avoiding the high resonant frequency range.

[0091] The second approach is that even if the upper limit of the high resonance frequency range is still higher than the vibration frequency generated by the wind turbine at the beginning stage, the upper limit of the high resonance frequency range has been reduced, and the wind turbine's speed gradually increases, which will increase its vibration frequency. This allows the wind turbine's vibration frequency to quickly exceed the high resonance frequency range, shortening the time when resonance may occur.

[0092] In one embodiment, if the vibration frequency generated by the rotation of the wind turbine is detected to be lower than the vibration frequency (natural frequency) of the tower 1 itself and close to the low resonance frequency range, the actuator 224 is used to improve the structural stiffness and vibration frequency of the tower 1.

[0093] Specifically, the actuator 224 is in the working state and presses against the sliding sleeve 222, and the servo elastic support 22 is in a reinforced support state, thereby improving the structural stiffness and vibration frequency of the tower 1 to avoid the vibration frequency generated by the wind turbine. This state belongs to a resonance avoidance-reinforced support state in which the servo elastic support 22 is in a reinforced support state.

[0094] In one embodiment, such as Figure 6-9 As shown, the fixed sleeve 221 is provided with a pusher 225 for driving the sliding sleeve 222 to retract.

[0095] When the actuator 225 is in the initial state, the push rod 2252 of the actuator 225 is in the retracted state and separated from the sliding sleeve 222. When the servo elastic support 22 is in the buffering and vibration reduction state and the reinforcement support state, the actuator 225 is in the initial state.

[0096] When the pusher 225 is in the working state, the push rod 2252 is in the extended state and pushes the sliding sleeve 222 to retract, so that the reinforcing plate 3 moves toward the inner side of the tower wall 1, thereby reducing the structural stiffness and vibration frequency of the tower 1.

[0097] The pusher 225 provided in this embodiment pushes the sliding sleeve 222 to retract, thereby causing the reinforcing plate 3 to move a certain distance toward the inner side of the tower wall 1, thereby reducing the structural stiffness of the tower 1 and thus reducing the vibration frequency of the tower 1.

[0098] The actuator 225 may adopt a hydraulic push rod, piston or similar structure, which includes a cylinder 2251 and a push rod 2252 that is slidably connected to the cylinder 2251.

[0099] The pusher 225 is located inside the fixed sleeve 221. The cylinder 2251 can be fixedly connected to the wall of the sliding sleeve 222, or it can be connected to the top cover 2211 of the fixed sleeve 221. One end of the push rod 2252 is slidably connected inside the cylinder 2251, and the other end faces the depth or below of the fixed sleeve 221. The push rod 2252 is arranged approximately parallel to the sliding sleeve 222. A boss or a raised ring can be provided around the sliding sleeve 222 so that the extended push rod 2252 presses against the boss or raised ring, thereby driving the sliding sleeve 222 along... Figure 9 Arrow C shown is retracted by a certain distance.

[0100] When the pusher 225 is in its normal or initial state, the push rod 2252 is in a retracted state, and it leaves the boss or ring of the sliding sleeve 222, without hindering the free extension and retraction of the sliding sleeve 222.

[0101] When the servo elastic support 22 is in the buffering and vibration reduction state or the reinforced support state, the actuator 225 is in the initial state. The aforementioned reinforced support state includes increasing the structural stiffness of the tower 1 to prevent tower 1 from swaying, and also includes increasing the structural stiffness of the tower 1 to prevent resonance.

[0102] When it is necessary to reduce the structural stiffness or rigidity of tower 1 in order to reduce its vibration frequency, the actuator 225 is used to achieve this.

[0103] If the vibration frequency generated by the wind turbine rotation is detected to be equal to or higher than the vibration frequency (natural frequency) of the tower 1 itself, and the vibration frequency generated by the wind turbine rotation is slightly lower than or within the high resonance frequency range, the actuator 225 is used to reduce the structural stiffness and vibration frequency of the tower 1.

[0104] Specifically, at this time, actuator 224 is in its initial state and does not obstruct the retraction of sliding sleeve 222. Pusher 225 is in operation, with its push rod 2252 extending and pushing sliding sleeve 222 back a certain distance. Since reinforcing plate 3 is supported by several sliding sleeves 222 and is not fixedly connected to the wall of tower 1, the retracted sliding sleeves 222 will cause reinforcing plate 3 to move away from the inner surface of tower 1's wall by a certain distance, which can be controlled between a few millimeters and a few centimeters, causing elastic pad 4 to leave the inner surface of tower 1's wall. At this time, reinforcing plate 3 no longer supports the wall of tower 1, therefore the structural stiffness or rigidity of tower 1 will decrease accordingly, thereby reducing the vibration frequency of tower 1 to avoid as much as possible from the vibration frequency generated by the wind turbine. The phrase "avoiding the vibration frequency of the wind turbine by reducing the vibration frequency of the tower 1" refers to lowering the upper limit of the high resonance frequency range by reducing the vibration frequency of the tower 1. The effect is one of the two effects mentioned above: one is that it can be completely avoided, and the other is that although it is not completely avoided, the resonance time can be shortened.

[0105] In one embodiment, such as Figure 6-9 As shown, a vibration sensor 226 is installed inside the end of the sliding sleeve 222 facing the reinforcing plate 3 to monitor the vibration of the tower wall 1. When the tower wall 1 vibrates, the vibration is transmitted to the sliding sleeve 222 through the elastic pad 4 and the reinforcing plate 3, and thus detected by the vibration sensor 226. The monitored vibration data is transmitted back to the control device so that the user can understand the vibration state of the tower 1, and judge whether the current vibration amplitude is serious based on the vibration data, estimate whether the servo elastic support 22 can meet the vibration reduction and buffering effect, and whether it is necessary to take other necessary measures, such as whether it is necessary to take measures to avoid resonance between the tower 1 and the wind turbine.

[0106] In one embodiment, such as Figure 6-9 As shown, a first displacement sensor 227 for monitoring the displacement of the sliding sleeve 222 is provided on the inner or outer side of the fixed sleeve 221. The data monitored by the first displacement sensor 227 is transmitted back to the control device so that the user can understand the extension and retraction range of the sliding sleeve 222, which helps to determine the vibration amplitude or vibration state of the tower 1. If the extension and retraction range of the sliding sleeve 222 is large and the time is long, it indicates that the vibration amplitude of the tower 1 is large and the frequency is low; if the extension and retraction range of the sliding sleeve 222 is small and the time is short, it indicates that the vibration amplitude of the tower 1 is small and the frequency is high.

[0107] In one embodiment, such as Figure 4 As shown, along the axial direction of the tower 1, multiple sets of vibration damping and reinforcement mechanisms 2 are provided at intervals inside the tower 1 to dampen and reinforce the tower 1 from different positions in the vertical direction, thereby further improving the reliability of the tower 1.

[0108] In one embodiment, such as Figure 3 As shown, each sliding sleeve 222 has a secondary connecting seat 23 hinged to its end, and the secondary connecting seat 23 is fixedly connected to the reinforcing plate 3.

[0109] In this embodiment, a secondary connecting seat 23 is provided at the end of each sliding sleeve 222. The secondary connecting seat 23 is hinged to the end of the sliding sleeve 222. During assembly, the secondary connecting seat 23 is fixed at a designated position on the reinforcing plate 3, for example by welding, which improves the convenience of assembly.

[0110] In one embodiment, such as Figure 6-9 As shown, one end of the sliding sleeve 222 inside the fixed sleeve 221 is connected to a pressure-bearing sliding plate 2221, and the pressure-bearing sliding plate 2221 is slidably connected to the cylinder wall of the fixed sleeve 221.

[0111] The elastic buffer 223 is connected between the pressure-bearing sliding plate 2221 and the top cover 2211 of the fixed sleeve 221.

[0112] The actuator 224 and the sliding sleeve 222 are located on opposite sides of the pressure-bearing sliding plate 2221, and the actuator 224 can lift the pressure-bearing sliding plate 2221.

[0113] In this embodiment, a pressure-bearing sliding plate 2221 is integrally or detachably connected to one end of the sliding sleeve 222. The pressure-bearing sliding plate 2221 is slidably assembled with the wall of the fixed sleeve 221, and can slide axially within the fixed sleeve 221. When the sliding sleeve 222 extends or retracts, the pressure-bearing sliding plate 2221 slides synchronously within the fixed sleeve 221.

[0114] A top cover 2211 is detachably mounted on the opening of the fixed sleeve 221 facing the reinforcing plate 3. The top cover 2211 of the fixed sleeve 221 has a through hole for the sliding sleeve 222 to pass through, but the pressure-bearing sliding plate 2221 cannot pass through the through hole of the top cover 2211. During assembly, the top cover 2211 is fitted onto the sliding sleeve 222 from the end of the sliding sleeve 222, then the pressure-bearing sliding plate 2221 is assembled into the fixed sleeve 221, and finally the fixed top cover 2211 is installed.

[0115] The aforementioned first displacement sensor 227 can be installed on the bottom surface of the top cover 2211 to monitor the moving distance of the pressure-bearing sliding plate 2221, thereby determining the extension and retraction length of the sliding sleeve 222.

[0116] An elastic buffer 223 is connected between the pressure-bearing sliding plate 2221 and the top cover 2211, and is used to drive the pressure-bearing sliding plate 2221 to move toward the top cover 2211, thereby causing the sliding sleeve 222 to extend. The elastic buffer 223 can be an expansion spring, which is sleeved on the circumferential surface of the sliding sleeve 222, and its initial force is used to drive the sliding sleeve 222 to extend.

[0117] The actuator 224 is located on the side of the pressure-bearing sliding plate 2221 opposite to the sliding sleeve 222. When working, the actuator 224 can lift the pressure-bearing sliding plate 2221 so that the sliding sleeve 222 remains extended and does not retract.

[0118] In an optional embodiment, the cylinder 2251 of the aforementioned pusher 225 can be fixedly connected to the bottom surface of the top cover 2211, and the push rod 2252 drives the sliding sleeve 222 to retract by pushing the pressure-bearing sliding plate 2221. When the pusher 225 is in the initial state, the retracted push rod 2252 is a distance away from the pressure-bearing sliding plate 2221, and will not affect the free sliding of the pressure-bearing sliding plate 2221.

[0119] In one embodiment, such as Figure 6-9 As shown, a limiting ring 2212 is provided inside the fixed sleeve 221, and the limiting ring 2212 is located between the pressure-bearing sliding plate 2221 and the top cover 2211.

[0120] When the sliding sleeve 222 extends to its maximum distance, the pressure-bearing sliding plate 2221 is blocked by the limiting ring 2212.

[0121] In this embodiment, a limiting ring 2212 is provided inside the fixed sleeve 221 to stop the pressure-bearing sliding plate 2221. The limiting ring 2212 is located between the pressure-bearing sliding plate 2221 and the top cover 2211. The diameter of the limiting ring 2212 allows the sliding sleeve 222 to pass through, but the pressure-bearing sliding plate 2221 cannot pass through. When the sliding sleeve 222 extends to its maximum distance, the pressure-bearing sliding plate 2221 is blocked by the limiting ring 2212, which plays a limiting role and prevents the sliding sleeve 222 from extending too far and applying excessive pressure to the reinforcing plate 3, thereby damaging the cylinder wall of the tower 1.

[0122] Specifically, the radius of the central hole of the limiting ring 2221 is greater than the distance between the central axis of the elastic buffer 223 and the sliding sleeve 222. The elastic buffer 223 is located inside the central hole, and the limiting ring 2221 will not hinder the free expansion and contraction of the elastic buffer 223.

[0123] The aforementioned first displacement sensor 227 can be selectively disposed on the limiting ring 2221. A through hole is provided on the limiting ring 2221, through which the first displacement sensor 227 passes from top to bottom. Its monitoring end is located within the through hole of the limiting ring 2221 and faces the pressure-bearing sliding plate 2221, used to monitor the moving distance of the pressure-bearing sliding plate 2221, thereby determining the extension / retraction length of the sliding sleeve 222. This arrangement avoids the first displacement sensor 227 being blocked by the limiting ring 2221 when installed on the top cover 2211, and also prevents damage to the first displacement sensor 227 even if the pressure-bearing sliding plate 2221 comes into contact with the limiting ring 2221.

[0124] In one embodiment, such as Figure 6-9 As shown, the limiting ring 2221 is provided with a push rod through hole 2213 for the push rod 2252 to pass through. The cylinder 2251 of the pusher 225 is installed between the limiting ring 2221 and the top cover 2211. The push rod 2252 can extend through the push rod through hole 2213 toward the pressure-bearing sliding plate 2221, thereby pushing the pressure-bearing sliding plate 2221 to drive the sliding sleeve 22 to retract a certain distance.

[0125] When the pusher 225 is in the initial state, the end of the retracted push rod 2252 is located between the pressure sliding plate 2221 and the cylinder 2251. It does not pass through the push rod through hole 2213, thus not affecting the free sliding of the pressure sliding plate 2221.

[0126] The push rod 2252 will pass through the push rod through hole 2213 only when the pusher 225 is in the working state.

[0127] In one embodiment, such as Figure 6-9 As shown, the actuator 224 includes a telescopic end 2241 extending toward the pressure-bearing sliding plate 2221 and a drive part 2242 for driving the telescopic end 2241 to extend, retract, or slide.

[0128] A pressure sensor 228 is provided in the end face of the telescopic end 2241 facing the pressure-bearing sliding plate 2221 and / or in the bottom surface of the pressure-bearing sliding plate 2221 facing the telescopic end 2241.

[0129] In this embodiment, the actuator 224 includes a telescopic end 2241 and a drive unit 2242. The telescopic end 2241 is connected to the drive unit 2242, extends towards the pressure-bearing sliding plate 2221, and can extend and retract relative to the drive unit 2242. The telescopic end 2241 can be a telescopic column, telescopic cylinder, etc. The drive unit 2242 can be a hydraulic drive unit or a current drive unit. When the drive unit 2242 is a hydraulic drive unit, the actuator 224 is a hydraulic cylinder structure. When the drive unit 2242 is a current drive unit, a shape memory alloy, dielectric elastomer, etc., that can expand when energized is disposed in the drive unit 2242, and the telescopic end 2241 is extended by the shape memory alloy, dielectric elastomer, etc., whose volume has increased.

[0130] A pressure sensor 228 is located on the end face of the telescopic end 2241 facing the pressure-bearing sliding plate 2221 and / or on the bottom surface of the pressure-bearing sliding plate 2221 facing the telescopic end 2241. It is used to monitor the pressure on the pressure-bearing sliding plate 2221, thereby determining the pressure borne by the sliding sleeve 222. The monitored pressure data is transmitted back to the control device so that the user can understand the stress state of the sliding sleeve 222.

[0131] In one embodiment, such as Figure 6 As shown, a second displacement sensor 229 is provided inside the fixed sleeve 221 to monitor the displacement of the telescopic end 2241. The data monitored by the second displacement sensor 229 is transmitted back to the control device so that the user can understand the extension distance of the telescopic end 2241, which helps to determine the position and extension length of the sliding sleeve 222, thereby determining the state of the tower cylinder 1. If the extension distance of the telescopic end 2241 is long, it means that the extension of the sliding sleeve 222 is longer, and the clamping effect on the reinforcing plate 3 is better; if the extension distance of the telescopic end 2241 is short, it means that the extension of the sliding sleeve 222 is short, which may indicate that the clamping effect on the reinforcing plate 3 is not ideal, or that the area where the reinforcing plate 3 is located has undergone inward deformation, making it impossible for the sliding sleeve 222 to extend. In this case, the user needs to observe the cylinder wall and make a comprehensive judgment. A critical value can be preset according to the actual situation to define the length of the extension distance of the telescopic end 2241.

[0132] An embodiment of the present invention provides a vibration reduction and reinforcement method for a wind turbine tower device, comprising the following steps:

[0133] S01: Monitor the vibration and swaying status of tower 1.

[0134] S02: If the sway amplitude of tower 1 is within the sway warning value, the actuator 224 remains closed, the servo elastic support 22 is in a buffer and vibration reduction state, and the elastic buffer 223 absorbs energy and reduces vibration to counteract the vibration of tower 1.

[0135] If the sway amplitude of tower 1 exceeds the sway warning value, actuator 224 is in working state and presses against sliding sleeve 222, and servo elastic support 22 is in reinforced support state to improve the structural rigidity of tower 1 and reduce sway.

[0136] In one embodiment, the vibration reduction and reinforcement method for wind turbine tower assembly further includes the following steps:

[0137] The actuator 224 is in working condition and presses against the sliding sleeve 222. The servo elastic support 22 is in a reinforced support state to improve the structural rigidity and vibration frequency of the tower 1, so as to avoid the vibration frequency generated by the wind turbine.

[0138] That is, if the vibration frequency generated by the wind turbine rotation is detected to be lower than the vibration frequency (natural frequency) of the tower 1 itself and close to the low resonance frequency range, actuator 224 is used to improve the structural stiffness and vibration frequency of the tower 1.

[0139] Specifically, the actuator 224 is in the working state and presses against the sliding sleeve 222, and the servo elastic support 22 is in a reinforced support state, thereby improving the structural stiffness and vibration frequency of the tower 1 to avoid the vibration frequency generated by the wind turbine. This state belongs to a resonance avoidance-reinforced support state in which the servo elastic support 22 is in a reinforced support state.

[0140] In one embodiment, the vibration reduction and reinforcement method for wind turbine tower assembly further includes the following steps:

[0141] Actuator 224 is in its initial state, and pusher 225 inside fixed sleeve 221 is in operation, pushing sliding sleeve 222 back, causing reinforcing plate 3 to move towards the inner side of tower wall 1, thereby reducing the structural stiffness and vibration frequency of tower 1 to avoid the vibration frequency generated by wind turbine. In one embodiment, as... Figure 6-9 As shown, the fixed sleeve 221 is provided with a pusher 225 for driving the sliding sleeve 222 to retract.

[0142] When the actuator 225 is in the initial state, the push rod 2252 of the actuator 225 is in the retracted state and separated from the sliding sleeve 222. When the servo elastic support 22 is in the buffering and vibration reduction state and the reinforcement support state, the actuator 225 is in the initial state.

[0143] When the pusher 225 is in the working state, the push rod 2252 is in the extended state and pushes the sliding sleeve 222 to retract, so that the reinforcing plate 3 moves toward the inner side of the tower wall 1, thereby reducing the structural stiffness and vibration frequency of the tower 1.

[0144] That is, when it is necessary to reduce the structural stiffness or rigidity of the tower 1 in order to reduce its vibration frequency, the actuator 225 is used to achieve this.

[0145] If the vibration frequency generated by the wind turbine rotation is detected to be equal to or higher than the vibration frequency (natural frequency) of the tower 1 itself, and the vibration frequency generated by the wind turbine rotation is slightly lower than or within the high resonance frequency range, the actuator 225 is used to reduce the structural stiffness and vibration frequency of the tower 1.

[0146] Specifically, at this time, actuator 224 is in its initial state and does not obstruct the retraction of sliding sleeve 222. Pusher 225 is in operation, with its push rod 2252 extending and pushing sliding sleeve 222 back a certain distance. Since reinforcing plate 3 is supported by several sliding sleeves 222 and is not fixedly connected to the wall of tower 1, the retracted sliding sleeves 222 will cause reinforcing plate 3 to move away from the inner surface of tower 1's wall by a certain distance, which can be controlled between a few millimeters and a few centimeters, causing elastic pad 4 to leave the inner surface of tower 1's wall. At this time, reinforcing plate 3 no longer supports the wall of tower 1, therefore the structural stiffness or rigidity of tower 1 will decrease accordingly, thereby reducing the vibration frequency of tower 1 to avoid as much as possible from the vibration frequency generated by the wind turbine. The phrase "avoiding the vibration frequency of the wind turbine by reducing the vibration frequency of the tower 1" refers to lowering the upper limit of the high resonance frequency range by reducing the vibration frequency of the tower 1. The effect is one of the two effects mentioned above: one is that it can be completely avoided, and the other is that although it is not completely avoided, the resonance time can be shortened.

[0147] As needed, the above technical solutions can be combined to achieve the best technical effect.

[0148] The above are merely the principles and preferred embodiments of the present invention. It should be noted that, for those skilled in the art, several other modifications can be made based on the principles of the present invention, and these modifications should also be considered within the scope of protection of the present invention.

Claims

1. A wind turbine tower assembly, characterized in that, It includes a tower (1) and multiple sets of vibration damping and reinforcement mechanisms (2) disposed inside the tower (1) and evenly distributed along the circumference of the tower (1). The inner wall of the tower (1) is evenly distributed with multiple longitudinal ribs (11) at intervals along the circumference. An arc-shaped reinforcing plate (3) is provided between each two adjacent longitudinal ribs (11), and an elastic pad (4) is provided between each reinforcing plate (3) and the tower (1). Each of the vibration damping and reinforcement mechanisms (2) includes a main connecting seat (21) fixedly connected to one of the longitudinal ribs (11) and two sets of servo elastic supports (22) arranged on opposite sides of the main connecting seat (21) and respectively hinged to the main connecting seat (21). The two sets of servo elastic brackets (22) are respectively hinged to the two reinforcing plates (3) on both sides of the longitudinal rib (11). Each reinforcing plate (3) is supported by two servo elastic brackets (22) in the two adjacent sets of vibration damping and reinforcement mechanisms (2), so that the reinforcing plate (3) presses the elastic pad (4). The servo elastic support (22) includes a fixed sleeve (221), a sliding sleeve (222) slidably connected to the fixed sleeve (221) and hinged to the reinforcing plate (3), an elastic buffer (223) connected between the fixed sleeve (221) and the sliding sleeve (222), and an actuator (224) disposed in the fixed sleeve (221) and used to push out the sliding sleeve (222). When the servo elastic support (22) is in the buffer and vibration reduction state, the actuator (224) is in the closed state, and the elastic buffer (223) absorbs energy and reduces vibration to counteract the vibration of the tower (1); When the servo elastic support (22) is in a reinforced support state, the actuator (224) is in a working state and presses against the sliding sleeve (222) to increase the structural rigidity of the tower (1) and reduce swaying; The fixed sleeve (221) is provided with a pusher (225) for driving the sliding sleeve (222) to retract. When the pusher (225) is in the initial state, the push rod (2252) of the pusher (225) is in the retracted state and separated from the sliding sleeve (222). When the servo elastic support (22) is in the buffer and vibration reduction state and the reinforcement support state, the pusher (225) is in the initial state. When the pusher (225) is in the working state, the push rod (2252) is in the extended state and pushes the sliding sleeve (222) to retract, so that the reinforcing plate (3) moves toward the inner side of the cylinder wall of the tower (1) to reduce the structural stiffness and vibration frequency of the tower (1).

2. The wind turbine tower device according to claim 1, characterized in that, A vibration sensor (226) is provided inside one end of the sliding sleeve (222) facing the reinforcing plate (3); And / or, a first displacement sensor (227) for monitoring the displacement of the sliding sleeve (222) is provided on the inner or outer side of the fixed sleeve (221).

3. The wind turbine tower device according to claim 1 or 2, characterized in that, The sliding sleeve (222) is connected to a pressure-bearing sliding plate (2221) at one end inside the fixed sleeve (221), and the pressure-bearing sliding plate (2221) is slidably connected to the cylinder wall of the fixed sleeve (221). The elastic buffer (223) is connected between the pressure-bearing sliding plate (2221) and the top cover (2211) of the fixed sleeve (221); The actuator (224) and the sliding sleeve (222) are located on opposite sides of the pressure-bearing sliding plate (2221), and the actuator (224) can lift the pressure-bearing sliding plate (2221).

4. The wind turbine tower device according to claim 3, characterized in that, The fixed sleeve (221) is provided with a limiting ring (2212), which is located between the pressure-bearing sliding plate (2221) and the top cover (2211); When the sliding sleeve (222) extends to its maximum distance, the pressure-bearing sliding plate (2221) is blocked by the limiting ring (2212).

5. The wind turbine tower device according to claim 3, characterized in that, The actuator (224) includes a telescopic end (2241) extending toward the pressure-bearing sliding plate (2221) and a drive part (2242) for driving the telescopic end (2241) to extend or slide. A pressure sensor (228) is provided in the end face of the telescopic end (2241) facing the pressure-bearing sliding plate (2221) and / or in the bottom face of the pressure-bearing sliding plate (2221) facing the telescopic end (2241).

6. The wind turbine tower device according to claim 5, characterized in that, The fixed sleeve (221) is provided with a second displacement sensor (229) for monitoring the displacement of the telescopic end (2241).

7. A method for vibration reduction and reinforcement of a wind turbine tower assembly as described in any one of claims 1-6, characterized in that, Includes the following steps: S01: Monitor the vibration and swaying status of the tower (1); S02: If the sway amplitude of the tower (1) is within the sway warning value, the actuator (224) remains closed, the servo elastic support (22) is in a buffer and vibration reduction state, and the elastic buffer (223) absorbs energy and reduces vibration to counteract the vibration of the tower (1); If the sway amplitude of the tower (1) exceeds the sway warning value, the actuator (224) is in working state and presses against the sliding sleeve (222), and the servo elastic support (22) is in a reinforced support state to improve the structural rigidity of the tower (1) and reduce sway.

8. The vibration reduction and reinforcement method for wind turbine tower assembly according to claim 7, characterized in that, Includes the following steps: The actuator (224) is in working condition and presses against the sliding sleeve (222), and the servo elastic support (22) is in a reinforced support state to improve the structural rigidity and vibration frequency of the tower (1) so as to avoid the vibration frequency generated by the wind turbine.

9. The vibration reduction and reinforcement method for wind turbine tower assembly according to claim 7, characterized in that, Includes the following steps: The actuator (224) is in the initial state, the pusher (225) in the fixed sleeve (221) is in the working state and pushes the sliding sleeve (222) to retract, so that the reinforcing plate (3) moves toward the inner side of the cylinder wall of the tower (1) to reduce the structural stiffness and vibration frequency of the tower (1) so as to avoid the vibration frequency generated by the wind turbine.

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