CN217730722U - Floating type wind turbine foundation - Google Patents

Abstract

The utility model provides a float formula wind energy conversion system basis. The floating type wind turbine foundation comprises side upright posts, a lower floating box and a tower frame, and is characterized by further comprising a first vibration damping device and a second vibration damping device; the number of the side upright posts is at least three, the second vibration damping device for inhibiting the vertical oscillation of the foundation of the floating wind turbine is arranged in the center of the enclosed side upright posts, one lower floating box is connected between the second vibration damping device and each side upright post, and the three lower floating boxes are intersected at the bottom of the second vibration damping device; the tower is arranged on one of the side upright posts, and the first vibration damping device for inhibiting the horizontal vibration of the tower is arranged in the tower. The utility model discloses the local oscillation of suppression extra-large-scale showy formula wind energy conversion system super high flexibility pylon that not only can be fine can also restrain the heaving motion response of semi-submerged showy formula basis, reduces and floats formula platform focus position, improves and floats formula wind energy conversion system stability.

Description

Floating type wind turbine foundation

Technical Field

The utility model relates to a float marine wind power technology field of formula, especially, relate to a float formula wind energy conversion system basis.

Background

At present, the built offshore wind farm is mostly located in intertidal zones and near sea areas, resource development is gradually saturated, deep and far sea wind energy has the obvious advantages of large resource storage, high wind speed, stable wind condition, no land occupation, no noise, no visual pollution and the like, and the development prospect is wide. Because the construction cost of the offshore pile foundation accounts for 14% -24% of the whole offshore wind power construction cost, the deep and remote sea area environment is more complex, the potential risk is larger, if a traditional fixed foundation is adopted, when the water depth exceeds 50 meters, the cost and the technical requirement of the fixed foundation are exponentially increased along with the increase of the water depth, the existing technology is difficult to realize, and the wind turbine generator set adopting the floating foundation has stronger adaptability to deep and remote sea areas, less construction difficulty and low operation and maintenance cost, and has good application prospect.

The floating type fan foundation is usually of a single column type, a tension leg type, a barge type, a semi-submersible type and the like, and the single column type is complex to install and poor in adaptive water depth; the tension leg type installation is complex, the cost is high, and the technical difficulty is high; the barge type has poor motion performance and poor sea condition adaptation capability.

The semi-submersible floating platform is widely applied due to good motion performance, good water depth adaptability and simple installation and construction by comprehensively considering the sea area condition, platform hydrodynamic performance, stability and construction cost of China. The traditional four-upright-column semi-submersible floating type wind power foundation has the defects of complex structure, difficulty in resisting oblique wave torsion, more complex nodes, high construction difficulty, difficulty in maintenance and the like, and is more suitable for large-scale development of offshore wind power fields due to the fact that the structural foundation is good in overall stability, small in construction difficulty and simple in structure when facing offshore complex environmental loads.

Under the load action of ocean waves, ocean currents, wind and the like, the floating wind power foundation causes the dynamic response of the platform, along with the increase of the depth of the seawater, the relative flexibility of the platform is gradually increased, the natural frequency related to vibration is gradually reduced, and when the low-frequency components gradually approach the frequency bandwidth of the ocean waves, huge energy concentration is caused to cause the platform response, so that the stability of the wind power floating foundation and the capability of resisting the wind waves are improved, the situation that the structure is damaged due to severe horizontal vibration is avoided, and the semi-submersible wind turbine foundation with good vibration reduction effect, simple structure and small installation difficulty needs to be developed.

The ultra-large semi-submerged floating wind turbine foundation based on the tuned mass damper, as disclosed in the prior patent publication No. CN113339200A, comprises an upper three-leg transition member, side upright posts, a lower floating box, a mooring system, a tower and a horizontal tuned mass damper, wherein the top ends of the side upright posts are respectively connected with the bottom ends of box-type heavy beams of the upper three-leg transition member, and the lower floating box replaces a rod structure to be connected between the side upright posts. The horizontal tuned mass damper comprises a fixed mass block, a spring shock absorber and a damper, and the top surface of the cabin partition plate of the lower buoyancy tank is arranged in a slide way parallel to the center line of the lower buoyancy tank. The stability control of the foundation of the ultra-large semi-submersible floating wind turbine is realized through the horizontal tuned mass damper. But the vibration damping is only limited to the horizontal position, and the vibration damping in the vertical direction can not be realized.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a float formula wind energy conversion system basis, local vibration of the super large-scale showy formula wind energy conversion system super high flexibility pylon of suppression that can be fine avoids arousing the fatigue failure of pylon because of huge energy is concentrated.

The technical scheme of the utility model is that: a floating type wind turbine foundation comprises side upright posts, a lower floating box and a tower frame, and is characterized by further comprising a first vibration damping device and a second vibration damping device; the number of the side upright columns is at least three, the second vibration damping device for inhibiting the vertical oscillation of the floating type wind turbine foundation is arranged in the center of the enclosed side upright columns, the lower buoyancy tank is connected between the second vibration damping device and each side upright column, and the three lower buoyancy tanks are intersected at the bottom of the second vibration damping device; the tower is arranged on one of the side upright posts, and the first vibration damping device for inhibiting the horizontal vibration of the tower is arranged in the tower.

In the scheme, the first vibration damping device is arranged at the tower frame, so that the local vibration of the ultra-high flexible tower frame of the ultra-large floating wind turbine can be well inhibited, and the fatigue damage of the tower frame caused by huge energy concentration is avoided; the second vibration damper is installed at the intersection point of the horizontal buoyancy tank to restrain the heaving motion response of the semi-submersible floating foundation, so that the vertical additional mass and the damping of the semi-submersible floating foundation are increased, and the stability is improved.

Preferably, the first vibration damping device is located on the inner side of a tower base of the tower, and the outer side face of the first vibration damping device is fixedly connected with the inner side face of the tower base.

Preferably, the lower floating box is connected to the lower ends of the side columns, the upper ends of the side columns are connected through transverse support rods, and inclined support rods are connected between the transverse support rods and the side columns.

Preferably, the first vibration damping device comprises a damper, a spring, a first plate, a first mass body and a second plate, the first mass body is arranged at the center of the first plate, the second plate is arranged around the first mass body in a surrounding manner, the spring is connected between each second plate and the first mass body, one damper is arranged between every two springs, and the damper is connected with corners of the first mass body and the two second plates; the first plate is connected with the bottom of the tower, and the second plate is connected with the inner side face of the tower.

Preferably, the first mass body is a polygon, and the number of sides of the polygon corresponds to the number of the second plate members.

Preferably, the second vibration damper includes springs, rod members, second mass bodies and third plate members, the third plate members are arranged at intervals up and down, the rod members are connected between the two third plate members, each rod member is provided with one second mass body and two springs in a penetrating manner, the two springs are respectively located at two ends of the second mass body, and the springs are abutted to the second mass body and the third plate members; the lower surface of the lower buoyancy tank is connected with the lower surface of the third plate located at the lower end.

Preferably, the second vibration damping device further includes a fourth plate member surrounding the outer periphery of the rod member.

Preferably, the side columns and the lower buoyancy tank are of hollow structures.

Compared with the prior art, the beneficial effects of the utility model are that:

1. compared with a four-upright semi-submersible floating type wind turbine foundation type, the three-upright scheme has the advantages of slight empty ship weight and stable integral structure due to the fact that one vertical upright is reduced, the wind turbine is located above one upright, the upright can be of a circular section so as to achieve good transition with a tower frame, the overall strength of the upright is high, and the adaptability to units with different unit capacities is good;

2. the three-upright-column scheme is adopted, the trend of the transverse/inclined supporting rods is determined, the number of nodes is small, the nodes are conventional nodes, the inspection and the maintenance are convenient, meanwhile, the dependence of installation resources of the scheme is small, the floating foundation can be berthed with a wharf, and the conventional hoisting resources can simply and conveniently realize the connection of wind turbine components and upright columns;

3. the heaving upright column and the large buoyancy tank are used as heaving inhibiting mechanisms, so that the gravity center of the semi-submersible floating foundation is reduced, the vertical additional mass and damping of the platform are increased, the heaving inherent period is increased, the heaving motion response amplitude is reduced, and the stability of the semi-submersible floating wind turbine system is improved;

4. the semi-submersible three-upright-column type wind turbine generator system is provided with transverse/inclined stay bar structures which are connected between the main upright columns in a K shape, so that a stable triangular structure is formed between the semi-submersible three-upright-column structures, powerful support is provided for an upper tower frame and a wind turbine generator system, separating force between lower floating boxes is effectively resisted, relative deformation of the upright columns is limited, and the stability of the semi-submersible three-upright-column type foundation is increased by increasing the span of the upright columns, so that the reliability and the safety of the whole floating type foundation are ensured;

5. the circular universal horizontal vibration damper is arranged at the tower base, plays a good role in inhibiting local vibration of the ultra-high flexible tower of the ultra-large floating wind turbine, avoids local fatigue damage of the tower caused by huge energy concentration, and simultaneously improves the stability of the output power of the ultra-large semi-submersible floating wind turbine system;

6. the unidirectional vertical heaving vibration damper is arranged at the intersection of the three lower floating boxes to inhibit the heaving motion response of the floating wind turbine foundation, increase the natural period of heaving, reduce the gravity center position of the semi-submersible floating wind turbine foundation and improve the stability of the semi-submersible floating wind turbine foundation.

Drawings

FIG. 1 is a schematic view of the overall structure of a floating wind turbine system according to the present invention;

FIG. 2 is a left side schematic view of FIG. 1;

FIG. 3 is a schematic top view of FIG. 1;

FIG. 4 is a schematic top view of the first vibration damping device of FIG. 1;

FIG. 5 is a schematic bottom view of FIG. 4;

FIG. 6 is a schematic top view of the second vibration damping device of FIG. 1;

fig. 7 is a bottom view of fig. 6.

In the drawings: 1. a main upright post; 2. a heave column; 3. a lower buoyancy tank; 4. a transverse stay bar; 5. a diagonal brace; 6. a first vibration damping device; 7. a second vibration damping device; 8. a tower; 9. a damper; 10. a spring; 11. a first plate member; 12. a first mass body; 13. a mooring system; 14. a ballast device; 15. a rod member; 16. a side column; 17. a second mass body; 18. a second plate member; 19. a third plate member; 20. a fourth plate.

Detailed Description

The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments. It should be noted that, in the present invention, the embodiments and features of the embodiments may be combined with each other without conflict. For convenience of description, the words "upper", "lower", "left" and "right" in the following description are used only to indicate the correspondence between the upper, lower, left and right directions of the drawings themselves, and do not limit the structure.

As shown in fig. 1 to 3, the floating wind turbine foundation provided by the present embodiment includes a side column 16, a lower buoyancy tank 3, a tower 8, a first vibration damping device 6, and a second vibration damping device 7.

The number of the side upright columns 16 is three, the side upright columns are distributed in a triangular shape, the second vibration damping devices 7 for inhibiting the vertical oscillation of the foundation of the floating wind turbine are arranged in the centers of the enclosed side upright columns 16, the lower buoyancy tanks 3 are connected between the second vibration damping devices 7 and each side upright column 16, and the three lower buoyancy tanks 3 are intersected at the bottoms of the second vibration damping devices 7. Of the three side uprights 16, on one of the side uprights 16 is mounted the tower 8 with the wind turbine. The first vibration damping device 6 for damping horizontal oscillations of the tower 8 is arranged in the tower 8.

The side upright post 16 comprises a main upright post 1 and a heave upright post 2 with equal sections. The heaving upright post 2 is arranged at the bottom of the main upright post 1, and the diameter of the heaving upright post 2 is larger than that of the main upright post 1. When the floating type wind turbine foundation moves, the waterplane area of the three side upright columns is always the same, and the stability of the structure is ensured by a stable period. The side upright posts 16 and the lower buoyancy tank 3 are hollow structures and provide required buoyancy for the platform main body. In addition, in order to increase the strength of the side columns, longitudinal girders, longitudinal bones, vertical and horizontal strengthening materials are distributed on the inner sides of the hollow outer shell plates of the main column 1 and the heave column 2. The bottom of the heave column 2 is provided with a mooring system 13. The lower floating box 3 is connected to the heaving upright post 2, so that the heaving upright post 2 and the lower floating box 3 form a heaving restraining mechanism of the floating type wind turbine foundation, the gravity center of the platform is reduced, and the stability of the three-upright-post platform is improved.

Each ballast device 14 is installed in each side upright column 16, each ballast device 14 is a purchased part, and the ballast amount is adjusted through an active ballast system to compensate the change of wind power and wave force, so that the foundation is kept in a vertical stable state, and the normal work of the wind turbine is guaranteed.

The lower buoyancy tank 3 is arranged between the vertical columns 2, the upper ends of the main vertical columns 1 are connected through transverse supporting rods 4, and inclined supporting rods 5 are connected between the transverse supporting rods 4 and the side vertical columns 16. The transverse supporting rods 4 and the inclined supporting rods 5 have equal section sizes and are connected between the main upright posts 1 in a K shape (as shown in figure 2), stable triangular structures are formed between the structures due to the arrangement of the form, the transverse supporting rods and the inclined supporting rods are prefabricated by high-strength steel materials, powerful support is provided for the upper wind turbine generator, separation force between the lower floating boxes 3 is effectively resisted, relative deformation of the side upright posts 16 is limited, and reliability and safety of the whole platform structure are guaranteed.

With the increase of water depth, the relative flexibility of the platform is gradually increased, the natural frequency related to vibration is gradually reduced, when the low-frequency components approach the frequency bandwidth of ocean waves, huge energy concentration occurs, and therefore the response of the platform is caused, for a semi-submersible type wind turbine, the oscillation of the tower and the heave motion response needs to be controlled in a key mode, therefore, the first vibration damping device 6 installed in the tower base of the tower 8 is a circular universal horizontal vibration damping device, and the second vibration damping device 7 installed above the intersection point of the three lower floating boxes 3 is a one-way vertical heave vibration damping device.

As shown in fig. 4 and 5, the first vibration damping device 6 includes a damper 9, a spring 10, a first plate 11, a first mass body 12, and a second plate 18. The first plate 11 is a circular steel plate, and the first mass body 12 is an octagon and is disposed at the center of the first plate 11. In order to reduce sliding friction, a ball is installed under the first mass body 12, and the ball is in contact with the first plate 11. The second plate 18 is in the periphery of the first mass body 12 is closed and is equipped with eight, every be connected between second plate 18 and the first mass body 12 the spring 10, spring 10 have one lead to many packing rings and bolt fastening on first mass body 12, the other end is fixed on second plate 18, the installation and dismantlement of being convenient for. One damper 9 is arranged between every two springs 10. The damper 9 connects the first mass body 12 and the corners of the two second plate members 18. The first plate member 11 is connected to the bottom of the tower 8, and the second plate member 18 is connected to the inner side of the tower 8. The damper moves together with the first mass body 12.

The first vibration damper 6 plays a good role in inhibiting local vibration of the ultra-high flexible tower 8 of the ultra-large floating wind turbine, avoids local fatigue damage of the tower 8 caused by huge energy concentration, and improves the stability of the output power of the ultra-large semi-submersible floating wind turbine system.

As shown in fig. 6 and 7, the second vibration damper 7 includes a spring 10, a rod 15, a second mass body 17, a third plate 19, and a fourth plate 20. The third plates 19 are arranged at intervals up and down, the rod members 15 are connected between the two third plates 19, each rod member 15 is provided with one second mass body 17 and two springs 10 in a penetrating manner, the two springs 10 are respectively arranged at two ends of the second mass body 17, and the springs 10 are abutted against the second mass body 17 and the third plates 19. The lower surface of the lower buoyancy tank 3 is fixedly connected with the lower surface of the third plate 19 positioned at the lower end. The fourth plate 20 surrounds the rod 15. The third plate 19 is a circular steel plate, the rod 15 is a thin solid rod and is vertically connected to limit the movement track of the annular second mass body 17, springs are respectively installed at two ends of the second mass body 17, and meanwhile, anti-collision rubber is respectively installed on the springs and the third plate 19 to prevent the third plate 19 from deforming and damaging.

The utility model discloses a be the three stand types of large-span, its full triangle-shaped's connection makes to float formula wind energy conversion system basis have structure and overall structure characteristic stable, build the degree of difficulty little, can realize advantages such as modularization construction. The tower and the upper wind turbine generator can be mounted above one of the stand columns, the stand columns are higher in overall strength, the adaptability to different single-machine capacity units is better, and meanwhile, the steel consumption and the construction cost of the platform are greatly reduced. In addition, the floating type wind turbine foundation has low requirement on the hoisting capacity, and the overall construction cost can be greatly reduced.

The above only is the embodiment of the present invention, not limiting the scope of the present invention, all the equivalent structures or equivalent processes of the present invention are used in the specification and the attached drawings, or directly or indirectly applied to other related technical fields, and the same principle is included in the protection scope of the present invention.

Claims (8)

1. A floating type wind turbine foundation comprises side upright posts (16), a lower floating box (3) and a tower (8), and is characterized by further comprising a first vibration damping device (6) and a second vibration damping device (7); the number of the side upright columns (16) is at least three, the second vibration damping device (7) for inhibiting the vertical oscillation of the foundation of the floating wind turbine is arranged in the center of the enclosed side upright columns (16), the lower buoyancy tank (3) is connected between the second vibration damping device (7) and each side upright column (16), and the three lower buoyancy tanks (3) are intersected at the bottom of the second vibration damping device (7); the tower (8) is mounted on one of the side uprights (16), and the first damping device (6) for damping horizontal oscillations of the tower (8) is arranged in the tower (8).

2. The floating wind turbine foundation according to claim 1, characterized in that the first vibration damping device (6) is positioned inside the foundation of the tower (8), and the outer side surface of the first vibration damping device (6) is fixedly connected with the inner side surface of the foundation.

3. The floating wind turbine foundation according to claim 1, characterized in that the lower buoyancy tank (3) is connected to the lower ends of the side columns (16), the upper ends of the side columns (16) are connected through transverse supporting rods (4), and inclined supporting rods (5) are connected between the transverse supporting rods (4) and the side columns (16).

4. The floating wind turbine foundation according to claim 1, wherein the first vibration damper (6) comprises a damper (9), a spring (10), a first plate (11), a first mass body (12) and a second plate (18), the first mass body (12) is arranged at the center of the first plate (11), the second plate (18) is arranged in a plurality of numbers around the outer periphery of the first mass body (12), the spring (10) is connected between each second plate (18) and the first mass body (12), one damper (9) is arranged between every two springs (10), and the damper (9) is connected at the corner of the first mass body (12) and the two second plates (18); the first plate (11) is connected with the bottom of the tower (8), and the second plate (18) is connected with the inner side face of the tower (8).

5. The floating wind turbine foundation according to claim 4, characterized in that the first mass body (12) is a polygon with a number of sides corresponding to the number of second plates (18).

6. The floating type wind turbine foundation according to claim 1, wherein the second damping device (7) comprises springs (10), rod pieces (15), second mass bodies (17) and third plate pieces (19), the third plate pieces (19) are arranged at intervals up and down, a plurality of rod pieces (15) are connected between the two third plate pieces (19), each rod piece (15) is provided with one second mass body (17) and two springs (10) in a penetrating manner, the two springs (10) are respectively arranged at two ends of the second mass body (17), and the springs (10) are abutted against the second mass body (17) and the third plate pieces (19); the lower surface of the lower buoyancy tank (3) is connected with the lower surface of the third plate (19) arranged at the lower end.

7. The floating wind turbine foundation according to claim 6, characterized in that the second vibration damper (7) further comprises a fourth plate member (20) surrounding the outer circumference of the rod member (15).

8. The floating wind turbine foundation according to claim 1, characterized in that the side columns (16) and the lower buoyancy tank (3) are hollow structures.

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