A bidirectional built-in wind turbine damping amplification transmission system

Abstract

The present invention discloses a bidirectional built-in wind turbine damping amplification and transmission system, which relates to the field of wind power generation technology. The system is placed in the tower of the wind turbine and includes a plurality of top fixings, cables, bottom fixings, triangular trusses, dampers, hinged columns and a base. The base is fixed to the ground, the bottom of the hinged column is hinged to the base, the top of the hinged column is rigidly connected to the triangular truss on all sides, the acute angle end of the triangular truss extends outward and is connected to the bottom fixing through the damper. The damper is located below the triangular truss, the bottom fixing is fixedly connected to the inner wall of the bottom end of the tower, the top fixing is fixedly connected to the inner wall of the top end of the tower, and the top fixing is connected to the middle of the top surface of the triangular truss through cables. The present invention adopts a bidirectional built-in wind turbine damping amplification and transmission system of the above structure, which has a simple structure and significant energy dissipation and vibration reduction effect.

Description

Technical Field

[0001] The present invention relates to the technical field of wind turbines, and in particular to a bidirectional built-in wind turbine damping amplification transmission system. Background Art

[0002] At present, the global consumption of energy resources is huge, and the mining and use of traditional fossil fuels and other resources have also caused serious environmental pollution. As a renewable clean energy with huge reserves, wide distribution and short infrastructure cycle, wind energy has received extensive attention and utilization in recent years, and wind power generation has also shown a strong development momentum. The structure of a wind turbine is as follows: Figure 1 As shown, a tower 3 is fixed to the ground, with a nacelle 1 mounted on top and blades 2 arranged on the sides. To ensure sufficient wind intake to meet power generation requirements, some towers 3 are built taller, further reducing their lateral stiffness. When subjected to wind loads or earthquakes, this can cause severe vibration in the wind turbine, severely impacting power generation performance and safety. Therefore, effectively reducing vibration in the wind turbine's cylinder structure, ensuring performance, and extending its service life, is of great research value. Summary of the Invention

[0003] The purpose of the present invention is to provide a bidirectional built-in wind turbine damping amplification transmission system with a simple structure and significant energy dissipation and vibration reduction effects.

[0004] To achieve the above-mentioned object, the present invention provides a bidirectional built-in wind turbine damping amplification transmission system, which is arranged in the tower of the wind turbine and includes a plurality of top fixing members, cables, a bottom fixing member, a triangular truss, a damper, a hinged column and a base. The base is fixed to the ground, the bottom of the hinged column is hinged to the base, the top of the hinged column is rigidly connected to the triangular truss on all sides, the acute angle end of the triangular truss extends outward and is connected to the bottom fixing member through the damper, the damper is located below the triangular truss, the bottom fixing member is fixedly connected to the bottom inner wall of the tower, the top fixing member is fixedly connected to the top inner wall of the tower, and the top fixing member is connected to the middle part of the top surface of the triangular truss through the cable;

[0005] Its working principle is as follows: the rotational deformation caused by the top of the tower being subjected to a horizontal load is transmitted to the cable through the top fixing part, and is amplified for the first time by the help of the length of the top fixing part. It is then converted into a relative vertical displacement between the end of the triangular truss and the bottom fixing part through the cable, acting on both ends of the damper for a second amplification, causing the hinged column to rotate in both directions with the bottom end as the center, thereby realizing the dynamic response control of the wind turbine structure under any horizontal load.

[0006] Preferably, the outer contour of the triangular truss is composed of an upper chord, a hypotenuse and a vertical side bar fixedly connected in sequence, the vertical side bar is fixedly connected to the hinged column, the hypotenuse is tilted downward, and a number of vertical webs are arranged inside the triangular truss. The two ends of the vertical webs are respectively fixedly connected to the upper chord and the hypotenuse, and a number of diagonal webs are also obliquely arranged between the upper chord and the hypotenuse.

[0007] Preferably, the middle portion of the top surface of the upper chord is fixedly connected to the bottom end of the cable, and the bottom end of the hypotenuse rod is fixedly connected to the top end of the damper.

[0008] Preferably, the damper is a viscous damper, a viscoelastic damper, a friction damper or a metal damper.

[0009] Preferably, the base is arranged at the exact center of the tower, and a concave movable groove is provided in the center of the top surface of the base, and the top surface of the movable groove is in the shape of a conical surface, an arc surface or a parabola.

[0010] Therefore, the present invention employs a bidirectional, internal wind turbine damping amplification and transmission system based on the aforementioned structure. This system converts the rotational deformation of the tower under horizontal loads into vertical displacement of the triangular truss ends via cables, and then into relative vertical displacement between the triangular truss ends and the ends of the bottom fixtures. This displacement acts on both ends of the damper, cleverly achieving control of the wind turbine structure's dynamic response under arbitrary horizontal loads. The internal design prevents interference with the wind turbine's normal operation; leveraging the tower's smaller top and larger bottom structure, the cables are precisely connected to the center of the triangular truss, thus ensuring a guaranteed damping amplification ratio.

[0011] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 Schematic diagram of the structure of a wind turbine;

[0013] Figure 2 This is a structural schematic diagram of a bidirectional built-in wind turbine damping amplification and transmission system according to an embodiment of the present invention;

[0014] Figure 3 This is a schematic diagram of the top structure of a bidirectional built-in wind turbine damping amplification and transmission system according to an embodiment of the present invention;

[0015] Figure 4 This is a schematic diagram of the bottom structure of a bidirectional built-in wind turbine damping amplification and transmission system according to an embodiment of the present invention;

[0016] Figure 5 This is a schematic diagram of the horizontal state of the bottom structure of an embodiment of the present invention;

[0017] Figure 6This is a schematic diagram of the bottom structure in an inclined state according to an embodiment of the present invention;

[0018] Figure 7 A schematic diagram of a triangular truss structure according to an embodiment of the present invention;

[0019] Figure 8 This is a schematic diagram of the base structure of an embodiment of the present invention;

[0020] Figure 9 This is a schematic diagram of the structure of the movable groove on the conical surface of the base according to an embodiment of the present invention;

[0021] Figure 10 Schematic diagram of the structure of the movable groove on the inner arc surface of the base according to an embodiment of the present invention.

[0022] Reference numerals

[0023] 1. Nacelle; 2. Blades; 3. Tower; 4. Top fixings; 5. Cables; 6. Triangular truss; 7. Articulated column; 8. Base; 9. Damper; 10. Bottom fixings; 11. Upper chord; 12. Vertical side members; 13. Vertical web members; 14. Diagonal web members; 15. Diagonal side members; 16. Movable slot. DETAILED DESCRIPTION

[0024] The technical solution of the present invention is further described below with reference to the accompanying drawings and embodiments.

[0025] Example

[0026] like Figure 2 As shown, a bidirectional built-in wind turbine damping amplification transmission system is placed in the tower 3 of the wind turbine, including several top fixing parts 4, cables 5, dampers 9, bottom fixing parts 10, triangular trusses 6, hinged columns 7 and bases 8. The bases 8 are arranged on the ground at the center of the tower 3. The top surface of the base 8 is provided with a concave movable groove 16 in the center. Figure 8 As shown, the top surface shape of the movable groove 16 can be a conical surface (such as Figure 9 As shown), arc surface (as shown Figure 10 As shown) or parabola, a space for rotation is reserved for the hinged column 7.

[0027] The bottom of the hinged column 7 is hinged to the base 8, and the top of the hinged column 7 is rigidly connected to the triangular truss 6. Figure 7As shown, the outer contour of the triangular truss 6 is composed of an upper chord 11, a hypotenuse 15, and a vertical side 12, which are fixedly connected in sequence. The vertical side 12 is fixedly connected to the hinge column 7, and the hypotenuse 15 is tilted downward. A number of vertical web members 13 are disposed within the triangular truss 6. The ends of the vertical web members 13 are respectively fixedly connected to the upper chord 11 and the hypotenuse 15. A number of diagonal web members 14 are also tilted between the upper chord 11 and the hypotenuse 15. The diagonal web members 14 divide the quadrilateral formed by the vertical web members 13, the upper chord 11, the vertical side 12, and the hypotenuse 15 into two triangles. The vertical web members 13 and the diagonal web members 14 serve as internal fixed structures, ensuring that the frame structure of each part of the triangular truss 6 remains triangular, thereby maintaining sufficient rigidity, load-bearing capacity, and out-of-plane stability.

[0028] like Figure 4 As shown, the acute-angled ends of the triangular truss 6 extend outward, the middle of the top surface of the upper chord 11 is fixedly connected to the bottom end of the cable 5, and the bottom end of the hypotenuse 15 is fixedly connected to the top end of the damper 9, which is located below the triangular truss 6. The bottom fixing member 10 is fixedly connected to the bottom inner wall of the tower 3, and the top fixing member 4 is fixedly connected to the top inner wall of the tower 3.

[0029] The transmission structure of the top fixing part 4-cable 5 converts the rotational deformation of the upper part of the tower 3 into the vertical deformation of the end of the top fixing part 4, and realizes the first amplification with the help of the length of the top fixing part 4; then the cable 5 realizes the transmission from high to low. The triangular truss 6 is arranged in the impeller axis direction and lateral direction (horizontal direction perpendicular to the impeller axis) of the hinged column 7, that is, a two-way arrangement, so that the two-way lever system composed of the triangular truss 6, the hinged column 7, and the damper 9 at the bottom has the characteristics of two-way operation, realizing the second amplification, significantly improving the energy consumption of the damper 9, and can easily control the vibration of the wind turbine under any horizontal load. Compared with the existing wind turbine vibration reduction structure that can only work in one direction, it is more practical. When the lever system at the bottom is not under force, the triangular truss 6 remains horizontal, such as Figure 5 As shown; when the top of the tower 3 deflects, the cable 5 transmits vibration to the triangular truss 6, the triangular truss 6 deflects, and energy is dissipated through the damper 9, as shown Figure 6 shown.

[0030] like Figure 3As shown, the top fixing member 4 and the bottom fixing member 10 are both right triangles, one of the right-angled sides of the right triangle is fixedly connected to the side wall of the tower 3, and the hypotenuse of the right triangle is tilted downward. The top end of the cable 5 and the bottom end of the damper 9 are respectively connected to one of the acute angles of the right triangle, and the acute angle ends face the center of the tower 3. Because the tower 3 has a small top and large bottom structure, the cable 5 is connected to the middle of the triangular truss 6 when it is hung from above, thereby ensuring the damping amplification ratio. Before being anchored, the cable 5 needs to be pre-tensioned to keep it taut so that it has sufficient rigidity to improve energy conversion efficiency. The shape of the top fixing member 4 and the bottom fixing member 10 is not limited to a triangle.

[0031] The damper 9 includes but is not limited to specific types such as a viscous damper, a viscoelastic damper, a friction damper or a metal damper.

[0032] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit the same. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that they can still modify or replace the technical solutions of the present invention with equivalents, and these modifications or equivalent replacements cannot cause the modified technical solutions to deviate from the spirit and scope of the technical solutions of the present invention.

Claims

1. A bidirectional internal wind turbine damping amplification and transmission system, installed in the tower of the wind turbine, characterized by: It includes several top fixings, cables, bottom fixings, triangular trusses, dampers, hinged columns and bases. The bases are fixed to the ground. The bottoms of the hinged columns are hinged to the bases. The tops of the hinged columns are rigidly connected to the triangular trusses. The acute angle ends of the triangular trusses extend outward and are connected to the bottom fixings through dampers. The dampers are located below the triangular trusses. The bottom fixings are fixedly connected to the inner wall of the bottom end of the tower. The top fixings are fixedly connected to the inner wall of the top end of the tower. The top fixings are connected to the middle of the top surface of the triangular trusses through cables. The rotational deformation that occurs when the top of the tower is subjected to horizontal loads is transmitted to the cables through the top fixings, and is amplified for the first time with the help of the length of the top fixings. It is then converted into a relative vertical displacement between the end of the triangular truss and the bottom fixings through the cables, acting on both ends of the damper for a second amplification, causing the hinged column to rotate in both directions with the bottom end as the center, thereby realizing the dynamic response control of the wind turbine structure under arbitrary horizontal loads.

2. A bidirectional internal wind turbine damping amplification and transmission system according to claim 1, characterized in that: The outer contour of the triangular truss is composed of an upper chord, a hypotenuse and a vertical side bar which are fixedly connected in sequence. The vertical side bar is fixedly connected to the hinged column, and the hypotenuse bar is tilted downward. A number of vertical web members are arranged inside the triangular truss. The two ends of the vertical web members are respectively fixedly connected to the upper chord and the hypotenuse bar. A number of diagonal web members are also arranged obliquely between the upper chord and the hypotenuse bar.

3. The bidirectional internal wind turbine damping amplification and transmission system according to claim 2, characterized in that: The middle part of the top surface of the upper chord rod is fixedly connected to the bottom end of the cable, and the bottom end of the hypotenuse rod is fixedly connected to the top end of the damper.

4. The bidirectional internal wind turbine damping amplification and transmission system according to claim 1, characterized in that: The damper adopts a viscous damper, a viscoelastic damper, a friction damper or a metal damper.

5. The bidirectional internal wind turbine damping amplification and transmission system according to claim 1, characterized in that: The base is arranged at the center of the tower, and a concave movable groove is provided in the center of the top surface of the base. The top surface of the movable groove is in the shape of a cone surface, an arc surface or a parabola.

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