Wind turbine foundation and wind turbine

Abstract

The present disclosure provides a wind turbine generator set foundation and a wind turbine generator set, wherein the wind turbine generator set foundation comprises a foundation body, wherein the foundation body extends upward from the seabed and sequentially passes through a tidal range zone and a wave splash zone, and a plurality of first through holes connecting an inner cavity of the foundation body and the outside are arranged on tower walls in the tidal range zone and the wave splash zone of the foundation body, and the plurality of first through holes are arranged in the tidal range zone and the wave splash zone. By arranging the first through holes on the tower wall of the foundation body, part of the seawater can enter the inner cavity of the foundation body through the first through holes during the process of seawater impacting the foundation body, thereby effectively reducing the force of waves on the wind turbine generator set foundation and enhancing the ability of the wind turbine generator set foundation to resist wave bending moment.

Description

Technical Field

[0001] The present invention belongs to the technical field of wind power generation, and in particular relates to a wind power generator set foundation and a wind power generator set. Background Art

[0002] As the capacity of wind turbines continues to expand, the weight of wind turbines and the length of blades also increase, and thus the load acting on the tower also increases accordingly, requiring the tower to have greater strength, rigidity and height.

[0003] The foundation of a wind turbine is one of the important components of a wind turbine. Since most of the tower foundation of an offshore wind turbine is located below sea level, it needs to be in contact with seawater for a long time and will be affected by the wave force of the seawater. As the volume of the tower increases, the diameter and weight of the wind turbine foundation also need to increase, resulting in an increase in the wave force of the seawater on the wind turbine foundation. The diameter of the wind turbine foundation still needs to be further increased, forming a vicious circle. Summary of the invention

[0004] The main purpose of the present disclosure is to provide a wind turbine generator set foundation to enhance the ability of the wind turbine generator set foundation to resist wave bending moment.

[0005] In view of the above objectives, the present disclosure provides the following technical solutions:

[0006] The present disclosure provides a wind turbine generator set foundation for an offshore wind turbine generator set, the wind turbine generator set foundation comprising a foundation body, the foundation body extending upward from the seabed and sequentially passing through a tidal range zone and a wave splash zone, a tower wall of the tidal range zone and the wave splash zone of the foundation body is provided with a plurality of first through holes connecting the inner cavity of the foundation body and the outside, the plurality of first through holes being arranged in the tidal range zone and the wave splash zone.

[0007] According to an exemplary embodiment of the present disclosure, the wind turbine generator foundation further includes a reinforcement layer wrapped around the periphery of the foundation body, the reinforcement layer includes an inner shell fitted with the outer peripheral wall of the foundation body, a second through hole is provided on the inner shell, and the second through hole at least partially overlaps with the first through hole in the radial direction.

[0008] Furthermore, the reinforcement layer also includes an outer shell which is sleeved on the outer circumference of the inner shell and spaced apart from the inner shell, and reinforcing ribs connected between the inner shell and the outer shell. A third through hole is provided on the outer shell, and the third through hole at least partially overlaps with the second through hole in the radial direction.

[0009] Specifically, the reinforcing ribs include a plurality of first reinforcing ribs extending axially along the basic body and a plurality of annular second reinforcing ribs extending circumferentially along the basic body, the plurality of first reinforcing ribs and the plurality of second reinforcing ribs dividing the space between the outer shell and the inner shell into a plurality of shell units, each of the shell units being provided with at least one of the second through holes.

[0010] According to another exemplary embodiment of the present disclosure, the second through hole is an elliptical hole, the major axis of the second through hole is parallel to the central axis of the basic body, the distance between adjacent second reinforcing ribs is a first distance, and the ratio η between the major axis of the second through hole and the first distance satisfies 1 / 5≤η≤1 / 3.

[0011] Furthermore, the second through hole has a major axis length of 200-300 mm and a minor axis length of 100-150 mm.

[0012] Specifically, the reinforcement layer further includes a hole wall protection layer adhered to the hole wall of the first through hole.

[0013] According to another exemplary embodiment of the present disclosure, the reinforcement layer also includes an inner wall protection layer, which is fitted on the inner wall of the basic body, and a fourth through hole is provided on the inner wall protection layer, and the fourth through hole is radially opposite to the first through hole; and / or the thickness of the inner wall protection layer is less than the thickness of either the inner shell or the outer shell.

[0014] Optionally, the reinforcement layer is made of carbon fiber material, the basic body is made of steel material, and the elastic modulus of the reinforcement layer is greater than the elastic modulus of the basic body.

[0015] Furthermore, the carbon fiber is T700 carbon fiber material.

[0016] Another aspect of the present disclosure provides a wind turbine generator set, wherein the wind turbine generator set comprises the wind turbine generator set foundation as described above.

[0017] The wind turbine generator set foundation and wind turbine generator set provided by the present invention have the following beneficial effects: by setting a first through hole on the tower wall of the foundation body, when the seawater impacts the foundation body, part of the seawater can enter the inner cavity of the foundation body through the first through hole, which can effectively reduce the force of waves on the wind turbine generator set foundation and enhance the ability of the wind turbine generator set foundation to resist wave bending moment. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The above and / or other objects and advantages of the present disclosure will become more apparent through the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0019] Figure 1 A structural diagram of a wind turbine generator set foundation provided by an exemplary embodiment of the present disclosure.

[0020] Figure 2 for Figure 1 A local enlarged view of the reinforcement layer.

[0021] Figure 3 for Figure 1 A top view of the wind turbine foundation.

[0022] Figure 4 for Figure 3 An enlarged view of the structure of the middle circle I.

[0023] Description of reference numerals:

[0024] 10. Basic body; 20. Strengthening layer;

[0025] 111, first through hole; 210, inner shell;

[0026] 211, second through hole; 220, housing;

[0027] 221. a third through hole; 230. a reinforcing rib;

[0028] 231, first reinforcing rib; 232, second reinforcing rib;

[0029] 240, inner wall protection layer; 241, fourth through hole;

[0030] 260. Hole wall protective layer. DETAILED DESCRIPTION

[0031] Example embodiments will now be described more fully with reference to the accompanying drawings. However, it should not be understood that the implementation of the present invention is limited to the embodiments described herein. The same reference numerals in the figures represent the same or similar structures, and thus their detailed description will be omitted.

[0032] Reference Figure 1 The present disclosure provides a wind turbine generator set, which may include a wind turbine generator set foundation and a tower arranged above the wind turbine generator set foundation, and the tower is connected to the wind turbine generator set foundation through a connecting flange on the top of the wind turbine generator set foundation.

[0033] At present, the foundation of a wind turbine is usually a cylindrical structure. As the load of the wind turbine continues to increase, the diameter of the wind turbine foundation is also increasing. The foundation of an offshore wind turbine will also be affected by the waves of the sea. In order to resist the wave force of the sea, it is usually necessary to increase the diameter of the wind turbine foundation again, thus forming a vicious circle. As a result, the weight of the wind turbine foundation is increased and its manufacturing cost remains high.

[0034] Reference Figures 1 to 4 In order to reduce the manufacturing cost of the wind turbine foundation and to be able to resist the wave force of seawater well, the wind turbine foundation may include a foundation body 10, which may extend upward from the seabed and successively pass through the sea mud area, full immersion area, tidal range area, and splash area of ​​the ocean until entering and exiting the atmospheric area.

[0035] A plurality of first through holes 111 connecting the inner cavity of the basic body 10 and the outside are arranged on the tower wall of the tidal zone and the splash zone of the basic body 10. The plurality of first through holes 111 are arranged in the tidal zone and the splash zone, that is, between the lower boundary of the tidal zone and the upper boundary of the splash zone.

[0036] By providing the first through hole 111 on the tower wall of the basic body 10, part of the seawater can enter the inner cavity of the basic body 10 through the first through hole 111 during the process of seawater impacting the basic body 10, which can effectively reduce the force of waves on the foundation of the wind turbine generator set and enhance the ability of the wind turbine generator set foundation to resist wave bending moment. In addition, since the first through hole 111 is provided on the basic body 10, the material of the wind turbine generator set foundation is saved, thereby reducing the manufacturing cost and reducing the weight of the wind turbine generator set foundation.

[0037] The wind turbine generator foundation provided by the present disclosure may be made of metal materials, such as but not limited to, stainless steel materials. In the present embodiment, DH36 marine steel plates may be used.

[0038] The inventors found that the wind turbine foundation located in the splash zone is periodically surrounded by seawater due to the action of waves and tides, resulting in the most serious corrosion of the wind turbine foundation in the splash zone. The tidal range zone can be the area between the lower limit of the splash zone and the designed low water level minus 1m, and its severity of corrosion to steel structures is second only to the splash zone.

[0039] Reference Figure 4 In order to improve the corrosion resistance of the wind turbine foundation, the wind turbine foundation may further include a reinforcing layer 20 wrapped around the periphery of the foundation body 10. Optionally, the reinforcing layer 20 may be arranged on the tower wall of the tidal range zone and the splash zone of the foundation body 10. Specifically, the reinforcing layer 20 may include an inner shell 210 that fits the outer peripheral wall of the foundation body 10, and a second through hole 211 is provided on the inner shell 210. The second through hole 211 and the first through hole 111 overlap at least partially in the radial direction, so that the seawater outside the wind turbine foundation can pass through the second through hole 211 and the first through hole 111 in sequence and enter the inner side of the wind turbine foundation. Preferably, the second through hole 211 and the first through hole 111 are arranged in a radially opposite manner. In the present embodiment, the second through hole 211 and the first through hole 111 are arranged in a radially opposite manner as an example for explanation.

[0040] Further, the reinforcing layer 20 can be made of a carbon fiber material with strong corrosion resistance, and the reinforcing layer 20 can be pasted on the tower wall to prevent the tower wall from contacting the seawater, thereby improving the corrosion resistance of the wind turbine generator set foundation. In order to improve the structural strength of the basic body 10, the reinforcing layer 20 can be made of a carbon fiber material whose elastic modulus can be greater than the elastic modulus of the steel material of the basic body 10, for example but not limited to, the carbon fiber material can be T700 carbon fiber material. Optionally, the reinforcing layer 20 can be connected to the inner shell 210 by bonding, but is not limited thereto.

[0041] By arranging a second through hole 211 on the inner shell 210, and the second through hole 211 and the first through hole 111 are arranged radially opposite to each other, the inner cavity of the basic body 10 can be connected with the outside through the second through hole 211 and the first through hole 111. When the seawater outside the wind turbine foundation hits the wind turbine foundation, it can enter the inner cavity of the wind turbine foundation through the second through hole 211 and the first through hole 111 in sequence, thereby reducing the wave load.

[0042] The stress conditions of the tower wall in the tidal zone and the splash zone of the basic body 10 are more complicated and are subjected to greater wave loads. In this embodiment, the reinforcement layer 20 is arranged in the tidal zone and the splash zone, and better structural strength is obtained while using less material to make the reinforcement layer 20.

[0043] In order to further improve the structural strength of the reinforcing layer 20, the reinforcing layer 20 may further include an outer shell 220 sleeved on the outer periphery of the inner shell 210 and spaced from the inner shell 210, and a reinforcing rib 230 connected between the inner shell 210 and the outer shell 220. The outer shell 220 is provided with a third through hole 221, and the third through hole 221 at least partially overlaps with the second through hole 211 in the radial direction. Preferably, the third through hole 221, the second through hole 211 and the first through hole 111 are arranged in a radially opposite manner. The third through hole 221, the second through hole 211 and the first through hole 111 are arranged in a radially opposite manner as an example in the accompanying drawings.

[0044] It is understandable that the reinforcement layer 20 provided in this embodiment is composed of an inner shell 210, an outer shell 220, and a reinforcement rib 230 connected between the inner shell 210 and the outer shell 220, that is, the reinforcement layer 20 is a hollow structure. Compared with a solid structure, the reinforcement layer 20 provided in this embodiment has the same structural strength, uses less material, reduces manufacturing costs, is lighter, and is easier to carry. The inner cavity of the basic body 10 is connected to the outside world through the third through hole 221, the second through hole 211, and the first through hole 111, which can reduce the force of waves. Optionally, the third through hole 221, the second through hole 211, and the first through hole 111 are the same size, but not limited to this.

[0045] Reference Figure 2 and Figure 4 The reinforcing ribs 230 can improve the overall structural rigidity and strength of the reinforcing layer 20, as well as the structural stability.

[0046] More specifically, the reinforcing ribs 230 may include a plurality of first reinforcing ribs 231 extending along the axial direction of the basic body 10 and a plurality of annular second reinforcing ribs 232 extending along the circumferential direction of the basic body 10, and the plurality of first reinforcing ribs 231 and the plurality of second reinforcing ribs 232 divide the space between the outer shell 220 and the inner shell 210 into a plurality of shell units, each of which is provided with at least one second through hole 211. Optionally, the inner shell 210 and the outer shell 220 are arranged substantially coaxially, but not limited thereto.

[0047] In this embodiment, the first reinforcing rib 231 and the second reinforcing rib 232 may have the same cross section, for example but not limited to, the cross section may be in the shape of an "I", "T", "H", etc. Figure 4 As shown, the “I”-shaped reinforcing rib 230 (i.e., the first reinforcing rib 231) is taken as an example for description. Specifically, the first reinforcing rib 231 may include a first end and a second end that are substantially parallel and spaced apart, and a connecting portion connected between the first end and the second end. The first end is fixed to the side of the inner shell 210 facing the outer shell 220, and the second end may be fixed to the side of the outer shell 220 facing the inner shell 210.

[0048] Figure 2 for Figure 1 The partial enlarged view of the reinforcement layer 20 in FIG. 1 mainly shows the distribution of two rows and two columns of shell units adjacent to each other, wherein the Figure 2 A portion of the inner shell 210 and a portion of the outer shell 220 may be substantially parallel, and adjacent shell units are separated by first reinforcing ribs 231 and second reinforcing ribs 232, and each shell unit is formed with at least one second through hole 211. For ease of description, in this embodiment, each shell unit is provided with a second through hole 211, and the second through hole 211 may be arranged at the central position of the shell unit.

[0049] More specifically, the second through hole 211 may be an elliptical hole, the major axis of the second through hole 211 may be parallel to the central axis of the basic body 10, the distance between adjacent second reinforcing ribs 232 may be a first distance, and the ratio η between the major axis of the second through hole 211 and the first distance satisfies: 1 / 5≤η≤1 / 3, that is, 3-5 second through holes 211 arranged adjacent to each other may be arranged in each shell unit along the central axis direction of the basic body 10. Optionally, 3-5 second through holes 211 arranged adjacent to each other may be arranged in each shell unit along the circumferential direction of the basic body 10. Optionally, the second through hole 211 may also be a circular hole, a square hole, a polygonal hole, etc.

[0050] In this embodiment, three second through holes 211 are arranged in each housing unit along the central axis of the basic body 10, and three second through holes 211 are arranged along its circumferential direction. Further, the major axis length of the second through hole 211 may be 200-300 mm, and the minor axis length may be 100-150 mm.

[0051] Continue to refer to Figure 4 In order to further improve the corrosion resistance of the foundation of the wind turbine generator set, the reinforcement layer 20 may further include an inner wall protection layer 240, which may be arranged on the inner wall of the basic body 10, and a fourth through hole 241 may be arranged on the inner wall protection layer 240, and the fourth through hole 241 is arranged radially opposite to the first through hole 111. Optionally, the inner cavity of the basic body 10 can be connected to the outside through the fourth through hole 241, the third through hole 221, the second through hole 211 and the first through hole 111, and the fourth through hole 241, the third through hole 221, the second through hole 211 and the first through hole 111 are of the same size and are arranged opposite to each other, so that the seawater outside the basic body 10 can enter the inner cavity of the basic body 10 through the third through hole 221, the second through hole 211, the first through hole 111 and the fourth through hole 241 in sequence.

[0052] Optionally, the inner wall protection layer 240 can be connected to the inner wall of the basic body 10 by bonding, but the invention is not limited thereto. In order to further reduce the material used in the reinforcing layer 20 and improve the material utilization rate, the thickness of the inner wall protection layer 240 can be less than the thickness of either the inner shell 210 or the outer shell 220. Compared with the force exerted by the waves on the outer wall of the basic body 10, the force exerted by the waves on the inner cavity of the basic body 10 is smaller, so the thickness of the inner wall protection layer 240 can be reduced. In this embodiment, the thickness of the inner shell 210 and the thickness of the outer shell 220 can be the same, but the invention is not limited thereto.

[0053] In order to further improve the corrosion resistance of the wind turbine generator foundation, the reinforcement layer 20 may further include a hole wall protection layer 260 disposed on the hole wall of the first through hole 111. Optionally, the hole wall protection layer 260 may be connected to the hole wall of the first through hole 111 by bonding, but is not limited thereto.

[0054] In the present disclosure, the hole wall protection layer 260, the inner wall protection layer 240, the inner shell 210, the outer shell 220 and the reinforcing rib 230 can be made of the same material, and the hole wall protection layer 260, the inner wall protection layer 240, the inner shell 210, the outer shell 220 and the reinforcing rib 230 can be formed independently and then assembled onto the basic body 10, or the hole wall protection layer 260, the inner wall protection layer 240, the inner shell 210, the outer shell 220 and the reinforcing rib 230 can also be integrally formed, which can be selected according to actual needs.

[0055] The present invention can effectively reduce the force of waves on the foundation of wind turbine generator sets, reduce wave loads, enhance the ability of the wind turbine generator set foundation to resist wave bending moments, avoid seawater corrosion on the wind turbine generator set foundation, and improve the applicability and safety of the steel pipe wind turbine generator set foundation in severe sea conditions.

[0056] Specifically, the reinforcement layer 20 includes an inner shell 210, an outer shell 220 and a reinforcement rib 230, and holes are respectively opened at corresponding positions on the inner shell 210, the outer shell 220 and the base body 10, so that the inner cavity of the base body 10 can be connected to the outside through the above-mentioned holes, so that the water particles moving in the waves can pass through the wind turbine generator foundation through the opening part, which can reduce the wave load compared with the existing solid structure without holes. The inner shell 210, the hole wall protection layer 260, and the inner wall protection layer 240 can isolate the base body 10 from seawater by wrapping the base body 10, thereby avoiding the electrochemical corrosion of seawater on the wind turbine generator foundation made of steel, without the need for anti-corrosion coating and sacrificial anode protection.

[0057] In the description of the present disclosure, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "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 disclosure and simplifying the description, 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 disclosure.

[0058] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present disclosure, unless otherwise specified, "plurality" means two or more.

[0059] In the description of the present disclosure, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present disclosure can be understood according to specific circumstances.

[0060] The features, structures or characteristics described in the present disclosure may be combined in one or more embodiments in any suitable manner. In the above description, many specific details are provided to provide a full understanding of the embodiments of the present disclosure. However, those skilled in the art will appreciate that the technical solutions of the present disclosure may be practiced without one or more of the specific details, or other methods, components, materials, etc. may be adopted. In other cases, known structures, materials or operations are not shown or described in detail to avoid blurring the various aspects of the present disclosure.

Claims

1. A wind turbine foundation, used for an offshore wind turbine, characterized in that: The wind turbine generator set foundation comprises a foundation body (10), the foundation body (10) extending upward from the seabed and sequentially passing through a tidal range zone and a wave splash zone, a plurality of first through holes (111) connecting an inner cavity of the foundation body (10) and the outside are arranged on tower walls of the tidal range zone and the wave splash zone of the foundation body (10), the plurality of first through holes (111) being arranged in the tidal range zone and the wave splash zone, the wind turbine generator set foundation further comprises a reinforcement layer (20) wrapped around the outer periphery of the foundation body (10), the reinforcement layer (20) comprising an inner shell (210) fitted with an outer peripheral wall of the foundation body (10), the inner shell (210) being provided with a second through hole (211), the second through hole (211) at least partially overlapping the first through hole (111) in a radial direction.

2. The wind turbine generator set foundation according to claim 1, characterized in that: The reinforcement layer (20) further comprises an outer shell (220) sleeved on the outer circumference of the inner shell (210) and spaced apart from the inner shell (210), and a reinforcement rib (230) connected between the inner shell (210) and the outer shell (220), wherein the outer shell (220) is provided with a third through hole (221), and the third through hole (221) at least partially overlaps with the second through hole (211) in the radial direction.

3. The wind turbine generator set foundation according to claim 2, characterized in that: The reinforcing ribs (230) include a plurality of first reinforcing ribs (231) extending along the axial direction of the basic body (10) and a plurality of annular second reinforcing ribs (232) extending along the circumferential direction of the basic body (10), wherein the plurality of first reinforcing ribs (231) and the plurality of second reinforcing ribs (232) divide the space between the outer shell (220) and the inner shell (210) into a plurality of shell units, and each of the shell units is provided with at least one second through hole (211).

4. The wind turbine generator set foundation according to claim 3, characterized in that: The second through hole (211) is an elliptical hole, the major axis of the second through hole (211) is parallel to the central axis of the basic body (10), the distance between adjacent second reinforcing ribs (232) is a first distance, and the ratio η between the major axis of the second through hole (211) and the first distance satisfies 1 / 5≤η≤1 / 3.

5. The wind turbine generator set foundation according to claim 4, characterized in that: The second through hole (211) has a major axis length of 200-300 mm and a minor axis length of 100-150 mm.

6. The wind turbine generator set foundation according to claim 1, characterized in that: The reinforcement layer (20) further comprises a hole wall protection layer (260) disposed in contact with the hole wall of the first through hole (111).

7. The wind turbine generator set foundation according to any one of claims 2 to 6, characterized in that: The reinforcing layer (20) further comprises an inner wall protection layer (240), the inner wall protection layer (240) being arranged in close contact with the inner wall of the basic body (10), and the inner wall protection layer (240) being provided with a fourth through hole (241), the fourth through hole (241) being arranged radially opposite to the first through hole (111); and / or, The thickness of the inner wall protection layer (240) is smaller than the thickness of either the inner shell (210) or the outer shell (220).

8. The wind turbine generator set foundation according to claim 7, characterized in that: The reinforcing layer (20) is made of carbon fiber material, the basic body (10) is made of steel material, and the elastic modulus of the reinforcing layer (20) is greater than the elastic modulus of the basic body (10).

9. A wind turbine generator set, characterized in that: The wind turbine generator set comprises a wind turbine generator set foundation according to any one of claims 1-8.

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