Floating wind turbine foundation and wind turbine generator set using trough-type anti-rolling water tank

Abstract

The invention discloses a floating wind turbine foundation and a wind turbine generator set adopting a groove-type anti-rolling water tank. The floating wind turbine foundation of the groove-type anti-rolling water tank comprises a mooring system, a foundation structure and an anchor foundation arranged on the seabed. The mooring system fixes the foundation structure on the anchor foundation on the seabed. The foundation structure comprises a straight column with a constant cross-section and a straight column with a variable cross-section. The lower end of the straight column with a constant cross-section is connected to the upper end of the straight column with a variable cross-section. The cross-section of the straight column with a variable cross-section gradually increases from top to bottom. The lower part of the straight column with a variable cross-section is provided with an anti-rolling water tank, which is divided into a plurality of compartments along the circumferential direction. The compartments are connected to each other through a connecting groove. The floating wind turbine foundation of the groove-type anti-rolling water tank of the invention can move the center of gravity of the whole structure downward, increase the damping coefficient, reduce the natural frequency, and increase the stability of the foundation platform; and reduce the draft, thereby expanding the application range of the foundation platform structure.

Description

Technical Field

[0001] The invention belongs to the technical field of floating foundation design for wind power generation, and in particular relates to a floating wind turbine foundation and a wind power generator set using a trough-type anti-rolling water tank. Background Art

[0002] With the continuous expansion of wind energy resource development, especially in deep sea, the research on floating wind turbines has attracted much attention. Commonly used floating foundations include upright column foundations, tension leg foundations and semi-submersible foundations. The water depth along the coast of China is relatively shallow. Considering the water depth applicability of the platform and the cost of the mooring structure, the upright column wind turbine foundation has attracted widespread attention due to its simple structure and good stability.

[0003] like Figure 1 As shown, conventional upright column floating wind turbines are suitable for deep seas with a water depth of 80m. They are mainly composed of four parts: wind turbine 1, tower 2, foundation structure 3 and mooring system 4. However, the foundation of an upright column floating wind turbine needs to consider wind loads, wave loads, hydrodynamic loads and mooring loads at the same time, so it has higher requirements for stability and requires a greater draft. Since there are very few waters within 100km offshore in China with a water depth greater than 80m, the water depth requirements for upright column floating wind turbine foundations cannot be met. Generally, the water depth is required to be greater than 80m, so it has not been studied by many scholars. The existing conventional upright column floating wind turbine foundations have high applicable water depth requirements and are not widely applicable in current coastal waters.

[0004] In addition, for the upright column floating wind turbine foundation structure, since its dynamic characteristics are similar to those of ships, it is possible to consider using anti-roll tanks to increase the stability of the foundation structure.

[0005] The disadvantages of the anti-rolling tank include: only when the anti-rolling tank reaches a certain volume can it generate sufficient roll restoring moment and the anti-rolling can have a certain effect; in addition, the self-rolling frequency of the anti-rolling tank must be higher than the self-rolling frequency of the floating foundation platform to achieve roll reduction, otherwise it may even increase the roll effect.

[0006] In summary, in order to solve the applicable water depth range of the upright column floating wind turbine foundation structure and increase the stability of the upright column floating foundation, it is necessary to optimize the structure of the conventional upright column floating wind turbine foundation. Summary of the invention

[0007] In order to solve the problems existing in the prior art, the present invention provides a floating wind turbine foundation and a wind turbine generator set using a trough-type anti-rolling water tank. The anti-rolling water tank design is provided to lower the center of the structure and reduce the draft depth, so that the upright column floating wind turbine foundation can be suitable for sea areas with a water depth of only more than 50m.

[0008] In order to achieve the above-mentioned purpose, the technical solution adopted by the present invention is: a floating wind turbine foundation using a groove-type anti-rolling tank, including a mooring system, a foundation structure and an anchor foundation arranged on the seabed. The mooring system fixes the foundation structure on the anchor foundation on the seabed. The foundation structure includes a uniform cross-section upright column and a variable cross-section upright column. The lower end of the uniform cross-section upright column is connected to the upper end of the variable cross-section upright column. The cross-section of the variable cross-section upright column gradually increases from top to bottom. An anti-rolling tank is arranged at the lower part of the variable cross-section upright column. The anti-rolling tank is divided into a plurality of compartments along the circumferential direction. The compartments are connected by a connecting groove. The anti-rolling tank is provided with at least one layer.

[0009] A water level monitoring sensor is installed in the anti-rolling water tank.

[0010] There are three layers of anti-rolling water tanks, and each layer of anti-rolling water tanks is independent of each other.

[0011] The anti-rolling tanks are divided into 4, 6 or 8 compartments.

[0012] The anti-rolling water tank comprises an outer tube and an inner tube, an annular space is formed between the inner tube and the outer tube, a partition is arranged in the annular space to divide it into a number of compartments, and a connecting groove connecting the compartments is arranged in the inner tube, and the number of the connecting grooves is half of the number of the compartments.

[0013] The height of the connecting trough is the same as that of the anti-rolling water tank.

[0014] The basic structure is formed by axially welding steel cylinder segments, and the steel cylinder segments are rolled by steel plates.

[0015] The connection between the uniform-section vertical columns and the variable-section vertical columns has a smooth transition.

[0016] Anti-corrosion coating is applied on the surface of mooring system and foundation structure.

[0017] A vertical column floating wind turbine generator set comprises a wind turbine, a tower and a foundation. The wind turbine is arranged at the top of the tower, and the tower is arranged on the foundation. The foundation adopts the floating wind turbine foundation using a grooved anti-rolling water tank as described in the present invention; the top end face of the foundation structure is not less than the diameter of the bottom end face of the tower.

[0018] Compared with the prior art, the present invention has at least the following beneficial effects:

[0019] The upper structure of the foundation structure is relatively small, and the lower structure is relatively large, which is used to lower the center of the entire structure, so that the overall center of gravity of the structure can be moved downward, the damping coefficient can be increased, and the natural frequency can be reduced. The trough-type anti-rolling tank has a wide range of wave frequencies and increases the stability of the foundation platform; and the draft depth is reduced, thereby expanding the scope of application of the foundation platform structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The above and other features and advantages of the present invention will become more apparent by describing in detail exemplary embodiments of the present invention in conjunction with the accompanying drawings, in which:

[0021] Figure 1 It is a conventional upright column floating wind turbine system.

[0022] Figure 2 The figure is a schematic diagram of an implementable upright column floating wind turbine generator set of the present invention.

[0023] Figure 3 The invention discloses an implementable floating fan upright column foundation structure of a trough-type anti-rolling water tank.

[0024] Figure 4 The figure is a schematic diagram of a trough-type anti-rolling tank structure that can be implemented in the present invention.

[0025] Figure 5a The figure is a schematic front view of an implementable trough-type anti-rolling water tank of the present invention.

[0026] Figure 5b A schematic top view of an implementable trough-type anti-rolling water tank of the present invention.

[0027] In the attached drawings, 1-wind turbine, 2-tower, 3-foundation structure, 4-mooring system, 5-connecting groove, 6-connecting groove, 31-vertical column with uniform cross-section, 32-vertical column with variable cross-section. DETAILED DESCRIPTION

[0028] The present invention is described in detail below with reference to the accompanying drawings, in which exemplary embodiments of the present invention are shown.

[0029] refer to Figure 1 and Figure 2 A floating wind turbine foundation using a trough-type anti-rolling tank includes a mooring system 4, a foundation structure 3 and an anchor foundation arranged on the seabed. The mooring system 4 fixes the foundation structure 3 on the anchor foundation on the seabed. The foundation structure 3 includes a uniform cross-section upright column 31 and a variable cross-section upright column 32. The lower end of the uniform cross-section upright column 31 is connected to the upper end of the variable cross-section upright column 32. The cross-section of the variable cross-section upright column 32 gradually increases from top to bottom. An anti-rolling tank 5 is arranged at the lower part of the variable cross-section upright column 32. The anti-rolling tank 5 is divided into a plurality of compartments along the circumferential direction. The compartments are connected by a connecting groove 6.

[0030] The anti-rolling water tank 5 is provided with at least one layer; when the anti-rolling water tank 5 is provided with multiple layers, each layer of the anti-rolling water tank 5 is independent of each other.

[0031] The anti-rolling tank 5 is divided into 4, 6 or 8 compartments.

[0032] Preferably, the anti-rolling water tank 5 is provided with three layers, and the height of the through groove 6 is the same as that of the anti-rolling water tank 5 .

[0033] The anti-rolling water tank 5 includes an outer tube and an inner tube, an annular space is formed between the inner tube and the outer tube, a partition is arranged in the annular space to divide it into a number of compartments, and a connecting groove 6 connecting the compartments is arranged in the inner tube, and the number of the connecting grooves is half of the number of the compartments.

[0034] The basic structure 3 is formed by axially welding steel cylinder segments, and the steel cylinder segments are rolled from steel plates.

[0035] The connection between the uniform cross-section upright column 31 and the variable cross-section upright column 32 is smoothly transitioned; the surface of the mooring system 4 and the foundation structure 3 is provided with an anti-corrosion coating.

[0036] As an embodiment of the present invention, a vertical column floating wind turbine generator set includes a wind turbine 1, a tower 2 and a foundation, wherein the wind turbine 1 is arranged at the top of the tower 2, and the tower 2 is arranged on the foundation, and the foundation adopts the floating wind turbine foundation using a trough-type anti-rolling water tank as described in the present invention; the top end face of the foundation structure 3 is not less than the diameter of the bottom end face of the tower 2.

[0037] The present invention provides a vertical column floating wind turbine foundation using a trough-type anti-rolling water tank, which is used to apply the vertical column floating foundation structure to sea areas with a water depth of only more than 50m, such as Figure 2 As shown, it has the following characteristics: a wind turbine 1 and a tower 2 are installed in a deep sea area, the wind turbine 1 is installed on the top of the tower 2, and a basic structure 3 is fixed on a pile foundation on the seabed through a mooring system 4.

[0038] refer to Figure 3 Compared with the prior art, the present invention includes: dividing the traditional equal-section upright column structure into two parts, the equal-section upright column 31 and the variable-section upright column 32.

[0039] like Figure 2 and Figure 3 As shown, the present invention proposes a foundation structure 3 of a vertical column floating wind turbine foundation using a grooved anti-rolling water tank, wherein the upper section AA' and the lower section BB' of the uniform cross-section vertical column 31 are equal, the upper section BB' of the variable cross-section vertical column 32 is equal to the lower section of the uniform cross-section vertical column 31, and the lower section CC' is significantly larger than the upper section BB', and the whole is in a trumpet shape with an opening downward.

[0040] The present invention proposes an upright column floating wind turbine foundation using a groove-type anti-rolling water tank. A plurality of sub-compartment anti-rolling water tanks 5 are arranged at the bottom of a foundation structure 3. The sub-compartments are connected by connecting grooves 6. The connecting grooves 6 connect the relative sub-compartments to ensure that the anti-rolling water tanks can be effective when shaking in different directions.

[0041] After the geometric dimensions of the anti-rolling tank are determined, its anti-rolling effect mainly depends on the arrangement of the vertical position, the liquid level height of the side tank and the selection of the damping coefficient. Therefore, when designing a specific project, the number of anti-rolling tanks, the width a4 of the connecting groove 6, and the water surface height need to be designed according to the site environmental conditions, wind turbine model size, foundation platform size, ballast weight, foundation platform stability index and other requirements of the specific project.

[0042] Figure 2 The present invention proposes an upright column floating wind turbine system, comprising: installing a wind turbine 1 and a tower 2 in a deep sea area, and fixing a foundation structure 3 on a pile foundation on the seabed through a mooring system 4.

[0043] Figure 3 The invention is a vertical column floating wind turbine foundation using a grooved anti-rolling water tank, which divides the traditional uniform cross-section vertical column structure into two parts, namely, a uniform cross-section vertical column 31 and a variable cross-section vertical column 32. The upper cross-section AA' and the lower cross-section BB' of the uniform cross-section vertical column 31 are equal, the upper cross-section BB' of the variable cross-section vertical column 32 is equal to the lower cross-section of the uniform cross-section vertical column 31, and the lower cross-section CC' is significantly larger than the upper cross-section BB', and the whole structure is in the shape of a trumpet with an opening downward.

[0044] Figure 4 , Figure 5a and Figure 5b The structural diagram, front view and top view of the trough type anti-rolling tank are given respectively. The dimensions of the foundation structure 3 are: OO”=50m, OO'=20m, O'O”=30m, D=30m, d=6m, BC and B'C' are connected by a straight line, AB and BC, A'B' and B'C' are chamfered at the connection, and the chamfer radius is 5m, AA'=BB'=7m, CC'=50m, and 3 layers of anti-rolling tanks are set, and the height of the anti-rolling tanks is h=4m, a=0.8m.

[0045] The height of the uniform cross-section upright column 31 is equal to the diameter of the bottom surface of the variable cross-section upright column 32 .

[0046] The foundation structure 3 is formed by rolling a steel plate with a height of 2.0m-3.0m into a cylinder, which is welded and connected by girth welds to form a vertical column floating foundation.

[0047] The upper cross section AA' of the base structure 3 has the same or slightly larger diameter than the bottom of the tower 2, and the lower cross section CC' of the base structure 3 has a diameter significantly larger than the upper cross section AA'. The cross-sectional diameters of ABC increase progressively.

[0048] The base structure 3 is connected to a seabed anchor foundation via a mooring structure 4 to prevent it from moving.

Claims

1. A floating wind turbine foundation using a trough-type anti-rolling water tank, characterized in that: The invention comprises a mooring system (4), a foundation structure (3) and an anchor foundation arranged on the seabed. The mooring system (4) fixes the foundation structure (3) on the anchor foundation on the seabed. The foundation structure (3) comprises a straight column (31) with a uniform cross section and a straight column (32) with a variable cross section. The lower end of the straight column (31) with a uniform cross section is connected to the upper end of the straight column (32) with a variable cross section. The cross section of the straight column (32) gradually increases from top to bottom. A roll reduction tank (5) is arranged at the lower part of the straight column (32). The roll reduction tank (5) is divided into a plurality of compartments along the circumferential direction. The compartments are connected by a connecting groove (6). The roll reduction tank (5) has at least one layer. A water level monitoring sensor is arranged in the roll reduction tank (5). The anti-rolling tank (5) is provided with three layers, and each layer of the anti-rolling tank (5) is independent of each other; the anti-rolling tank (5) comprises an outer cylinder and an inner cylinder, an annular space is formed between the inner cylinder and the outer cylinder, a partition is provided in the annular space to divide it into a plurality of compartments, and a connecting groove (6) connecting the compartments is provided in the inner cylinder, and the number of the connecting grooves is half the number of the compartments; the height of the connecting groove (6) is the same as the height of the anti-rolling tank (5); the foundation structure (3) is formed by welding steel cylinder segments along the axial direction, and the steel cylinder segments are rolled by steel plates; the connection between the uniform cross-section upright column (31) and the variable cross-section upright column (32) is smoothly transitioned; the surface of the mooring system (4) and the foundation structure (3) is provided with an anti-corrosion coating.

2. A vertical column floating wind turbine generator set, characterized in that: The invention comprises a wind turbine (1), a tower (2) and a foundation, wherein the wind turbine (1) is arranged at the top of the tower (2), and the tower (2) is arranged on the foundation, wherein the foundation adopts the floating wind turbine foundation adopting a trough-type anti-rolling water tank as claimed in claim 1; and the top end face of the foundation structure (3) is not less than the diameter of the bottom end face of the tower (2).

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