Suspension type multi-tuned mass damping device for wind turbine generator

Abstract

The invention belongs to the technical field of wind power towers, and particularly relates to a suspension type multi-tuned mass damping device for a wind turbine generator, which comprises a plurality of tuned mass dampers with different vibration control frequencies, and the plurality of tuned mass dampers are sequentially arranged on the outer side of a tower of the wind turbine generator from bottom to top; the tuned mass damper comprises an annular counter weight, wherein the inner wall of the annular counter weight is connected with the outer wall of the tower drum through a damping part; and the fixing part is fixedly connected with the outer wall of the tower drum, the fixing part is connected with the annular balance weight, and the fixing part is used for supporting the annular balance weight. According to the device, the multiple tuned mass dampers are arranged on the outer side of the tower drum to form a multiple tuned mass damper system, and each tuned mass damper has respective vibration control frequency, so that the control frequency band width of the whole system is greatly improved, and the external vibration excitation resisting capacity of the structure is remarkably improved.

Description

Technical Field

[0001] The invention belongs to the technical field of wind power towers, and in particular relates to a suspended multiple tuned mass damping device for a wind turbine generator set. Background Art

[0002] As a clean and renewable form of energy, wind power generation has received widespread attention and application around the world. As the main supporting structure of wind turbines, the stability and safety of wind turbine towers are directly related to the operating efficiency and life of the entire wind power generation system. However, in actual operation, wind turbine towers are often affected by complex dynamic loads, such as wind, earthquakes, waves, etc., which cause the tower to vibrate. These vibrations will not only affect the normal operation of wind turbines, but may also damage the tower structure and shorten its service life. Therefore, how to effectively reduce the vibration of wind turbine towers under various complex loads and reduce the impact of fatigue damage has become an important issue that needs to be urgently solved in the field of wind power generation technology and related engineering.

[0003] In order to solve the vibration problem of wind turbine tower, we propose a suspended multiple tuned mass damping device for wind turbines. Summary of the invention

[0004] The object of the present invention is to provide a suspended multiple tuned mass damping device for a wind turbine generator set to solve the above-mentioned problem.

[0005] To achieve the above object, the present invention provides the following solutions:

[0006] A suspended multiple tuned mass damping device for a wind turbine generator system, comprising:

[0007] A plurality of tuned mass dampers with different vibration control frequencies, wherein the plurality of tuned mass dampers are sequentially arranged on the outside of the tower of the wind turbine from bottom to top;

[0008] The tuned mass damper comprises:

[0009] An annular counterweight, wherein the inner wall of the annular counterweight is connected to the outer wall of the tower via a damping portion;

[0010] The fixing part is fixedly connected to the outer wall of the tower, the fixing part is connected to the annular counterweight, and the fixing part is used to support the annular counterweight.

[0011] Optionally, the annular weights of the plurality of tuned mass dampers decrease sequentially from bottom to top.

[0012] Optionally, the annular counterweight includes an annular liquid storage box, in which liquid is stored.

[0013] Optionally, the fixing portion includes a dish-shaped hollow steel plate, the dish-shaped hollow steel plate is connected to the annular liquid storage box, and the annular liquid storage box is suspended below the dish-shaped hollow steel plate.

[0014] Optionally, the bottom ends of a plurality of steel strands are fixedly connected to the top of the annular liquid storage box at equal intervals in the circumferential direction, and the top ends of the steel strands are fixedly connected to the corresponding disc-shaped hollow steel plates.

[0015] Optionally, the damping part includes a plurality of viscous dampers, which are circumferentially evenly spaced on the inner side of the annular liquid storage tank, one end of the viscous damper is universally hinged to the inner wall of the annular liquid storage tank, and the other end of the viscous damper is universally hinged to the outer wall of the tower.

[0016] Optionally, the viscous damper comprises:

[0017] A cylinder body, with end covers fixedly connected to both ends of the cylinder body; one end of the cylinder body is universally hinged to the outer wall of the tower;

[0018] A medium cavity is arranged in the cylinder body, and sealing bushings are respectively provided at both ends of the medium cavity, and the sealing bushings are fixedly connected to the cylinder body;

[0019] A piston is slidably disposed in the medium cavity, and a damping hole is provided on the piston;

[0020] A damping medium is filled in the medium cavity;

[0021] A piston rod is axially connected to the inner side of the piston, one end of the piston rod passes through the cylinder body and the other end is universally hinged to the inner wall of the annular liquid storage box.

[0022] Optionally, water is injected into the annular liquid storage box, and space is left in the annular liquid storage box during the injection of water.

[0023] Compared with the prior art, the present invention has the following advantages and technical effects:

[0024] When in use, multiple tuned mass dampers (TMDs) are set on the outside of the tower to form a multiple tuned mass damper system (MTMD), and each tuned mass damper has its own vibration control frequency, which greatly improves the control bandwidth of the entire system and significantly improves the ability of the structure to resist external vibration excitation, thereby adapting to different vibration environments. In the multiple tuned mass damper system, multiple tuned mass dampers work in parallel, each assuming a part of the vibration energy absorption and dissipation task. This not only enhances the overall vibration reduction efficiency of the system, but also improves the system's adaptability to vibration excitations of different frequencies. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative labor:

[0026] Figure 1 It is a schematic diagram of the structure of the present invention;

[0027] Figure 2 It is a schematic diagram of the connection between the dish-shaped hollow steel plate and the annular liquid storage box of the present invention;

[0028] Figure 3 It is a schematic diagram of the external structure of the viscous damper of the present invention;

[0029] Figure 4 Schematic diagram of the internal structure of the viscous damper of the present invention;

[0030] Among them, 1. Blade; 2. Nacelle; 3. Tower; 4. Disc-shaped hollow steel plate; 5. Steel strand; 6. Annular liquid storage tank; 7. Viscous damper; 8. Connecting ear plate; 9. Pin seat; 10. Pin shaft; 11. Cylinder body; 12. End cover; 13. Piston; 14. Damping hole; 15. Sealing bushing; 16. Damping medium; 17. Piston rod. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0033] Reference Figures 1 to 4 The present invention discloses a suspended multi-tuned mass damping device for a wind turbine generator set, comprising:

[0034] A plurality of tuned mass dampers with different vibration control frequencies, wherein the plurality of tuned mass dampers are sequentially arranged on the outer side of the tower 3 of the wind turbine from bottom to top;

[0035] Tuned mass dampers include:

[0036] An annular counterweight, the inner wall of which is connected to the outer wall of the tower 3 via a damping part;

[0037] The fixing part is fixedly connected to the outer wall of the tower 3, and the fixing part is connected to the annular counterweight, and the fixing part is used to support the annular counterweight.

[0038] The top of the tower 3 is fixedly connected with a nacelle 2 , and the output end of the nacelle 2 is axially connected with a blade 1 .

[0039] When in use, multiple tuned mass dampers (TMDs) are arranged on the outside of the tower 3 to form a multiple tuned mass damper system (MTMD), and each tuned mass damper has its own vibration control frequency, which greatly improves the control bandwidth of the entire system and significantly improves the ability of the structure to resist external vibration excitation, thereby adapting to different vibration environments. In the multiple tuned mass damper system, multiple tuned mass dampers work in parallel, each assuming a part of the task of absorbing and dissipating vibration energy. This not only enhances the overall vibration reduction efficiency of the system, but also improves the system's adaptability to vibration excitations of different frequencies.

[0040] Since the vibration reduction control effect of the tuned mass damper is related to its mass, the traditional tuned mass damper can only be installed inside the tower 3, and its mass will be limited by space. However, the inventive tuned mass damper of this solution is sleeved on the outside of the tower 3. The mass of the tuned mass damper is not limited by space, and the effect of the damper can be fully exerted. It also avoids the damping device being set inside the wind turbine tower 3 and affecting the later maintenance of the wind turbine blades 1 and the interior of the nacelle 2.

[0041] As an optional implementation, the annular weights of the plurality of tuned mass dampers decrease in sequence from bottom to top.

[0042] As an optional implementation, the annular counterweight includes an annular liquid storage box 6 , in which liquid is stored.

[0043] The middle of the annular liquid storage box is hollow and is used for injecting liquid. The overall mass can be adjusted by coordinating the mass of the annular liquid storage box 6 itself and the mass of the liquid injected therein.

[0044] As an optional implementation, the fixing portion includes a dish-shaped hollow steel plate 4 , which is connected to an annular liquid storage box 6 , and the annular liquid storage box 6 is suspended below the dish-shaped hollow steel plate 4 .

[0045] As an optional embodiment, the bottom ends of a plurality of steel strands 5 are fixedly connected to the top of the annular liquid storage box 6 at equal intervals in the circumferential direction, and the top ends of the steel strands 5 are fixedly connected to the corresponding disc-shaped hollow steel plates 4 .

[0046] The dish-shaped hollow steel plate 4 is fixed to the tower 3 by welding, and a number of hooks (six in this embodiment) are welded at the outer edge of the dish-shaped hollow steel plate 4. A hook is also provided at the corresponding position of the annular liquid storage tank 6. One end of the steel strand 5 is hooked to the hook corresponding to the dish-shaped hollow steel plate 4, and the other end is hooked to the hook of the annular liquid storage tank 6 below.

[0047] As an optional embodiment, the damping part includes a plurality of viscous dampers 7, which are circumferentially evenly spaced on the inner side of the annular liquid storage tank 6, one end of the viscous damper 7 is universally hinged to the inner wall of the annular liquid storage tank 6, and the other end of the viscous damper 7 is universally hinged to the outer wall of the tower 3.

[0048] In this embodiment, the universal joint also includes a ball joint form, that is, the two ends of the viscous damper 7 are connected to the annular liquid storage box 6 and the tower 3 respectively through a ball joint.

[0049] As an optional implementation, the viscous damper 7 includes:

[0050] The cylinder body 11 has end covers 12 fixedly connected to both ends of the cylinder body 11; one end of the cylinder body 11 is universally hinged to the outer wall of the tower 3;

[0051] The medium cavity is arranged in the cylinder body 11, and sealing bushings 15 are respectively provided at both ends of the medium cavity for sealing, and the sealing bushings 15 are fixed in the cylinder body 11;

[0052] A piston 13 is slidably disposed in the medium cavity, and a damping hole 14 is formed on the piston 13;

[0053] A damping medium 16 is filled in the medium cavity;

[0054] The piston rod 17 is axially connected to the inner side of the piston 13 , one end of the piston rod 17 passes through the cylinder body 11 and the other end is universally hinged to the inner wall of the annular liquid storage box 6 .

[0055] The viscous damper 7 mainly comprises a cylinder 11, a piston 13, a piston rod 17, an end cover 12, a flowable damping medium 16 filled in the cylinder, a sealing bushing 15 and connecting ear plates 8 at both ends.

[0056] As an optional embodiment, the connecting ear plate 8 is hinged with a pin seat 9 via a pin shaft 10 , and the pin seat 9 is rotatably arranged on the inner wall of the annular liquid storage box 6 or the outer wall of the tower 3 .

[0057] The cylinder 11 is the main body of the viscous damper 7, and its internal space can accommodate the movement of the damping medium 16 and the piston 13. The piston rod 17 penetrates the cylinder 11, and one end of the piston rod 17 is fixedly connected to the connecting ear plate 8. The piston 13 is fixed to the right of the middle of the piston rod 17. A small gap is left between the cylindrical outer surface of the piston 13 and the inner wall of the cylinder 11, and an appropriate damping hole 14 is set on the piston 13 to ensure that the damping medium 16 can flow through the gap between the piston 13 and the cylinder 11 and the damping hole 14 when the piston 13 moves. A sealing bushing 15 is set at an appropriate distance on the inner side of the end cover 12 and the right side of the piston 13 to prevent the leakage of the damping medium 16, thereby ensuring the reliability and stability of the viscous damper 7 in long-term operation. The viscous damper 7 not only plays a buffering and tuning role to prevent frequency misalignment under large swing angles, but also plays a guiding and limiting role to prevent the annular liquid storage box 6 from hitting the outer wall of the tower 3.

[0058] As an optional implementation, water is injected into the annular liquid storage box 6 , and space is left in the annular liquid storage box 6 when the water is injected.

[0059] The annular liquid storage box 6 is hollow in the middle for easy installation. Water is injected into the annular liquid storage box 6 during the use stage, and space is left in the annular liquid storage box 6 when water is injected.

[0060] When the wind turbine is subjected to external excitation (such as earthquake, wind load, etc.) and vibrates, the vibration will first be transmitted to the annular liquid storage box 6 connected thereto. The water inside the annular liquid storage box 6 will slosh due to inertia. Since the movement of water has hysteresis, there is a certain phase difference between the sloshing direction of the water and the vibration direction of the main structure. The inertia of the water will cause it to generate a force in the viscous damper 7 that is opposite to the vibration direction of the main structure. This reaction force will hinder the vibration of the main structure, thereby consuming the vibration energy of the main structure.

[0061] Secondly, the wind turbine tower 3 responds dynamically, and then vibrates by deviating from the equilibrium position. At this time, the viscous damper 7 on one side will be squeezed by the movement of the tower 3, and the viscous damper 7 on the other side will be stretched, thereby driving the piston 13 of the viscous damper 7 to reciprocate in the cylinder 11, thereby achieving the effect of energy consumption. The piston 13 in the viscous damper 7 divides the cylinder 11 into two parts. During the reciprocating movement of the piston 13 in the cylinder 11, the damping medium 16 flows rapidly in the two separated chambers. During the flow of the damping medium 16, the mechanical energy is converted into heat energy and dissipated through internal interactions, including the interaction between the damping medium 16 and the piston 13, the interaction between the damping medium 16 and the cylinder 11, the interaction between the damping medium 16, and the interaction between the piston rod 17 and the sealing bushing 15, especially when passing through the damping hole 14, a huge throttling damping is generated. The damping force generated in the flow converts the kinetic energy generated by the external excitation into heat through the reciprocating motion of the piston 13 in the damping medium 16 and dissipates it, so that the movement speed of the piston 13 gradually decreases, achieving the purpose of damping energy consumption, thereby reducing the vibration of the building structure.

[0062] The beneficial effects of this application include the following:

[0063] 1. The annular liquid storage box 6 of the present invention is arranged outside the tower 3, which can give full play to the effect of the viscous damper 7. It also avoids the damping device being arranged inside the wind turbine tower 3 and affecting the later maintenance of the wind turbine blades 1 and the interior of the nacelle 2.

[0064] 2. The viscous damper 7 connects the connecting ear plate 8 with the pin seat 9 through the pin shaft 10, which is easy to install and replace. The mass of each TMD can be adjusted by increasing or decreasing the liquid in the annular liquid storage box 6, thereby adjusting the natural frequency of the damper. The annular liquid storage box 6 can also be used as a water supply tank or a fire water tank, etc., which improves the utilization of space and reduces the duplication of equipment.

[0065] 3. When the structure is vibrated by external excitation, the liquid in the annular liquid storage box 6 will shake accordingly, generating a damping force to consume part of the vibration energy. The viscous damper 7 is squeezed or stretched by the movement of the tower, thereby driving the piston 13 of the damper to reciprocate in the cylinder 11, achieving the effect of energy consumption and realizing a dual energy consumption mechanism. This combination not only enhances the stability of the structure, but also significantly improves the efficiency of vibration control. Installing several TMDs in the vertical direction of the wind turbine to form an MTMD system can more effectively absorb and weaken the vibration energy of the tower 3 under multiple dangers, reduce structural fatigue damage caused by vibration, extend the service life of the wind turbine, and improve the stability and safety of the overall structure. Since several viscous dampers 7 are installed around the wind turbine tower, vibrations in all directions can be effectively adjusted.

[0066] In the description of the present invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0067] The embodiments described above are only descriptions of the preferred modes of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should all fall within the protection scope determined by the claims of the present invention.

Claims

1. A suspended multiple tuned mass damping device for a wind turbine, characterized in that: include: A plurality of tuned mass dampers with different vibration control frequencies, wherein the plurality of tuned mass dampers are sequentially arranged from bottom to top on the outside of a tower (3) of a wind turbine generator set; The tuned mass damper comprises: An annular counterweight, wherein the inner wall of the annular counterweight is connected to the outer wall of the tower (3) via a damping portion; A fixing portion, fixedly connected to the outer wall of the tower (3), the fixing portion being connected to the annular counterweight, and the fixing portion being used to support the annular counterweight; The annular counterweight comprises an annular liquid storage box (6), and liquid is stored in the annular liquid storage box (6); Water is injected into the annular liquid storage box (6), and space is left in the annular liquid storage box (6) during the injection of water.

2. A suspended multiple tuned mass damping device for a wind turbine according to claim 1, characterized in that: The annular weights of the tuned mass dampers decrease in sequence from bottom to top.

3. A suspended multiple tuned mass damping device for a wind turbine according to claim 1, characterized in that: The fixing portion comprises a disc-shaped hollow steel plate (4), the disc-shaped hollow steel plate (4) is connected to the annular liquid storage box (6), and the annular liquid storage box (6) is suspended below the disc-shaped hollow steel plate (4).

4. A suspended multiple tuned mass damping device for a wind turbine according to claim 3, characterized in that: The bottom ends of a plurality of steel strands (5) are fixedly connected at equal intervals in the circumferential direction to the top of the annular liquid storage box (6), and the top ends of the steel strands (5) are fixedly connected to the corresponding disc-shaped hollow steel plates (4).

5. A suspended multiple tuned mass damping device for a wind turbine according to claim 1, characterized in that: The damping part comprises a plurality of viscous dampers (7), the plurality of viscous dampers (7) being arranged at equal intervals in the circumferential direction on the inner side of the annular liquid storage box (6), one end of the viscous damper (7) being universally hinged to the inner wall of the annular liquid storage box (6), and the other end of the viscous damper (7) being universally hinged to the outer wall of the tower (3).

6. A suspended multiple tuned mass damping device for a wind turbine according to claim 5, characterized in that: The viscous damper (7) comprises: A cylinder body (11), with end covers (12) fixedly connected to both ends of the cylinder body (11); one end of the cylinder body (11) is universally hinged to the outer wall of the tower (3); A medium cavity is arranged in the cylinder body (11), and sealing bushings (15) are respectively provided at both ends of the medium cavity for sealing, and the sealing bushings (15) are fixedly connected in the cylinder body (11); A piston (13) is slidably disposed in the medium cavity, and a damping hole (14) is formed on the piston (13); A damping medium (16) is filled in the medium cavity; A piston rod (17) is axially connected to the inner side of the piston (13); one end of the piston rod (17) passes through the cylinder body (11) and the other end is universally hinged to the inner wall of the annular liquid storage box (6).

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