Deep and far sea multi-impeller fan and offshore photovoltaic power generation integrated floating platform

Abstract

The invention relates to the technical field of offshore wind energy and photovoltaic power generation, and discloses a deep and far sea multi-impeller fan and offshore photovoltaic power generation integrated floating platform which comprises a wind energy capturing device, a floating body structure and a photovoltaic power generation platform. The diving truss and the upper plane truss are located at the bottom and the top of the floating body structure respectively, the diving truss and the upper plane truss are connected at the corners through the stand column type truss, the side edges of the diving truss and the upper plane truss are connected through the multiple inclined struts, and the wind energy capturing device is arranged on the stand column type truss. And the photovoltaic power generation platform covers the upper plane truss. The wind bearing area of the blades is large, the wind flow field is stable, the mass and capture density of wind energy among the multi-impeller fans are mutually independent, the power generation reliability is greatly enhanced, the gravity center of the whole system is low, in addition, the floating body is in a truss form, the wave flow induced motion amplitude is greatly reduced, and the steel weight and cost are reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of offshore wind energy and photovoltaic power generation, and in particular to an integrated floating platform for deep-sea multi-impeller wind turbines and offshore photovoltaic power generation. Background Art

[0002] As offshore wind energy resources are exhausted, deep-sea wind energy development has gradually become a research hotspot. The existing semi-submersible floating body is the mainstream structural type of floating wind turbine foundation, but the semi-submersible floating body has technical defects such as pitch stability, coupled motion, and mooring performance. Especially for large-scale floating wind turbines in the deep sea and photovoltaic power generation platforms requiring large areas, the operating reliability and maintenance of floating structures directly affect the economy of floating wind turbines. For semi-submersible floating bodies, the scale difference between the semi-submersible floating body and the connecting device is large, and there are a large number of structural discontinuities. This technical defect is very obvious in a semi-submersible drilling platform, resulting in a lot of structural cracks after operation. The floating wind turbines operating in the marine environment are more likely to produce a large number of structural cracks during the induced motion, and even cause the entire structural device to collapse and be destroyed. Therefore, it is difficult to ensure the reliability of the operation of large-scale floating wind turbines in the deep sea by using conventional semi-submersible floating bodies. In addition, in order to reduce the economic cost of unit wind energy density, deep-sea floating wind turbines generally design blades with longer diameters, thereby increasing the installed capacity of a single wind turbine. The maximum installed capacity of existing single-impeller offshore wind turbines is 20MW, and the corresponding blade length is generally ~310m. In order to ensure the wind energy capture density of the blades and minimize the influence of wind wake disturbances, the blades of multi-impeller wind turbines are generally set in the same direction and arranged in a row. For multi-impeller floating wind turbines arranged in parallel for deep-sea operations, conventional semi-submersible, column-type and TLP-type floating structures are difficult to meet the design requirements for such lengths.

[0003] In addition to semi-submersible, deep-sea floating platforms can also adopt truss type. The advantages of truss type are light weight, good rigidity, small underwater wet surface area, less induced motion by waves and currents, and better motion performance. However, the disadvantage of truss type is that the center of gravity is higher than other forms of floating structures due to its light weight, especially when applied to deep-sea floating wind turbines. In the future, the use of ordinary truss floating bodies for multi-impeller offshore floating wind turbines is likely to cause technical defects such as insufficient stability due to the high center of gravity, or more violent motion induced by wind.

[0004] The prior art has proposed some forms of multi-impeller wind turbines, but when solving the problem of wind load on the impeller, the general solution is to set up a pre-tightening system to directly transfer the wind force to the floating foundation, thereby reducing the wind torque. For floating wind turbines with single tower and multiple impellers and single tower and single impeller, the problem can be effectively solved by setting up a pre-tightening system. However, for floating wind turbines with multiple towers and multiple impellers, the use of multiple towers through a single floating foundation or multiple floating foundations will not only greatly reduce the pre-tightening effect, but also place particularly high requirements on the structural design of the floating foundation. This is because for the floating foundation of a large-megawatt multi-impeller wind turbine, the floating foundation itself is relatively large in size. When the local alternating load is too large and the frequency is too high, fatigue damage to local structural nodes is very likely to occur.

[0005] In addition, the existing offshore photovoltaic platforms need to design an independent floating structure system and mooring system. Sufficient air gaps need to be ensured between the floating structure and the photovoltaic panels to ensure that the photovoltaic panels will not be damaged by waves. Although the wind-solar complementary system can largely make up for the defects of the wind or solar energy industry, it is impossible to combine wind turbines and photovoltaic panels into one system, thereby increasing the costs of operation and maintenance, floating body design, and mooring. In addition, since the photovoltaic platform is light in weight and large in area, considering the cost of the floating foundation, the floating foundation is generally set as a truss type, which also brings great challenges to the fatigue life of the photovoltaic platform.

[0006] In summary, the defects of the existing technology in the process of designing multi-impeller offshore floating wind turbine solutions are mainly that it is impossible to take into account the requirements of good motion performance and low center of gravity, and to propose a low-cost floating structure design solution for parallel wind turbines with multi-impellers of 20MW and above installed capacity. At the same time, the technical defects of the design of offshore photovoltaic platforms are mainly that the independent setting of floating structures and mooring systems greatly increases the cost of capturing deep-sea light energy, and the photovoltaic platform needs to set the air gap too high, making it difficult to effectively utilize the inherent advantages of the platform. In addition, the current photovoltaic platform structure connection form is also prone to fatigue damage and other problems. Summary of the invention

[0007] In view of the above problems, the present invention proposes an integrated floating platform for deep-sea multi-impeller wind turbines and offshore photovoltaic power generation.

[0008] The technical solution of the present invention is an integrated floating platform for deep-sea multi-impeller wind turbines and offshore photovoltaic power generation, including a wind energy capture device, a floating structure and a photovoltaic power generation platform. The floating structure includes a column truss, a diagonal brace, a submersible truss and an upper plane truss. The submersible truss is located at the bottom of the floating structure, and the upper plane truss is located at the top of the floating structure. The submersible truss and the upper plane truss are connected at the corners by a column truss, and the sides of the submersible truss and the upper plane truss are connected by multiple diagonal braces. The wind energy capture device is arranged on the column truss, and the photovoltaic power generation platform covers the upper plane truss.

[0009] Optionally, the floating structure is a triangular frame, and the diagonal brace, the submersible truss and the upper plane truss form a triangular support structure.

[0010] Optionally, a plurality of diagonal braces are provided in the submersible truss and the upper plane truss, and the diagonal braces separate the submersible truss and the upper plane truss into four triangular areas.

[0011] Optionally, a plurality of platform installation docking interfaces are provided in the triangular region of the upper plane truss, the platform installation docking interfaces are connected to the tower, and the photovoltaic power generation platform is riveted to the platform installation docking interfaces through the support frame.

[0012] Optionally, the wind energy capturing device includes wind turbine blades and a tower, wherein the bottom of the tower is connected to the upper end of the column-type truss, and the wind turbine blades are connected to the upper end of the tower.

[0013] Optionally, the column-type truss includes a vertical truss and two inclined trusses, the upper ends of the inclined trusses are inclined outward, and the towers connected thereto are inclined outward at the same angle.

[0014] Optionally, the minimum angle θ between the tower and the plumb bob direction is determined according to the side length L of the upper plane truss, the diameter D of the wind turbine blade and the tower height H. The diameter D of the wind turbine blade is the maximum diameter of the blade rotation envelope circle. The specific formula is:

[0015] θ=arcsin((LD) / 2H),

[0016] Wherein, θ does not exceed 60 degrees, and the length of the tower is longer than the radius of the wind turbine blade.

[0017] Optionally, a single-point mooring column is provided in the vertical truss, the upper end of the single-point mooring column is connected to the tower, and the lower end is connected to and extends out of the column truss with a mooring cable.

[0018] Optionally, the wind blades face the same direction and face the center line direction of the floating structure where the vertical truss is located, and the center height of the wind blades arranged on the vertical truss is higher than the center height of the wind blades arranged on the two inclined trusses.

[0019] Optionally, the upper plane truss, column truss and diagonal brace are all fully watertight structures, and watertight bulkheads are provided on three sides of the submersible truss. The watertight bulkheads divide a single side of the submersible truss into multiple independent watertight compartments, and a ballast system is configured in the watertight compartments.

[0020] In summary, the present invention has at least one of the following beneficial effects:

[0021] 1. The present invention designs a large-megawatt parallel multi-impeller deep-sea floating wind turbine design, which has a large wind receiving area of ​​the blades, a stable wind flow field, and independent quality and capture density of wind energy between the multi-impeller wind turbines, greatly enhancing the reliability of power generation, and a low center of gravity for the entire system. In addition, the floating body adopts a truss form, which greatly reduces the amplitude of wave-induced motion, and reduces the weight and cost of steel.

[0022] 2. The present invention provides an offshore photovoltaic power generation interface above the truss structure, and fixes the photovoltaic platform on the floating wind turbine foundation by riveting, thereby avoiding fatigue damage caused by welding. At the same time, due to the large size of the floating wind turbine, the air gap requirement of the photovoltaic platform is easily guaranteed on this basis. Through the technical solution proposed by the present invention, wind energy and light energy are more closely combined, which not only greatly increases the air gap between the photovoltaic panel and the water surface, reduces air salinity corrosion, avoids wave impact, and prevents photovoltaic modules from being affected by sea debris, but also uses the floating wind turbine foundation to provide positioning for the photovoltaic platform, reducing the mooring cost of existing offshore photovoltaic power generation platforms.

[0023] 3. The present invention utilizes the complementarity of solar photovoltaic power generation and wind power generation in resources to increase the output of clean electricity and improve the power generation per unit sea area; shares the equipment connected to the power system, shares the equipment infrastructure, and reduces the project cost; smoothes the output volatility of single green electricity, and wind power and photovoltaic power can achieve high complementarity and realize stable and continuous power supply; in terms of operation and maintenance, the operation and maintenance manpower and equipment resources can be shared, which has significant economic benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the overall structure of an integrated floating platform for deep-sea multi-impeller wind turbines and offshore photovoltaic power generation according to the present invention;

[0025] Figure 2 It is a schematic diagram of the contact plane between the floating structure and the photovoltaic power generation platform of the present invention;

[0026] Figure 3 It is a schematic diagram of the vertical truss structure;

[0027] In the figure: 11, wind turbine blades; 12, tower 21, column truss; 22, diagonal brace; 23, submersible truss; 24, upper plane truss; 3, photovoltaic power generation platform; 41, single-point mooring column; 42, mooring cable. DETAILED DESCRIPTION

[0028] The following combination Figure 1-3 The present invention is described in further detail.

[0029] The present invention discloses an integrated floating platform for deep-sea multi-impeller wind turbines and offshore photovoltaic power generation, referring to Figure 1 , including a wind energy capture device, a floating structure and a photovoltaic power generation platform 3, the floating structure includes a column truss 21, a diagonal brace 22, a submersible truss 23 and an upper plane truss 24, the submersible truss 23 is located at the bottom of the floating structure, and the upper plane truss 24 is located at the top of the floating structure, wherein the submersible truss 23 is located below the sea surface, and the upper plane truss 24 is located above the sea surface, the submersible truss 23 and the upper plane truss 24 are connected at the corners by the column truss 21, and the sides of the submersible truss 23 and the upper plane truss 24 are connected by multiple diagonal braces 22, the wind energy capture device is arranged on the column truss 21, and the photovoltaic power generation platform 3 is covered on the upper plane truss 24; the floating structure is a triangular frame, and the diagonal brace 22, the submersible truss 23 and the upper plane truss 24 form a triangular support structure;

[0030] The wind energy capture device includes a wind turbine blade 11 and a tower 12, wherein the bottom of the tower 12 is connected to the upper end of the column truss 21, and the wind turbine blade 11 is connected to the upper end of the tower 12;

[0031] The column truss 21 includes a vertical truss and two inclined trusses. The upper end of the inclined truss is inclined outward, and the tower 12 connected thereto is inclined outward at the same angle; the minimum angle θ between the tower 12 and the plumb direction is determined according to the side length L of the upper plane truss 24, the diameter D of the fan blade 11 and the tower height H. The diameter D of the fan blade 11 is the maximum diameter of the blade rotation envelope circle. The specific formula is:

[0032] θ=arcsin((LD) / 2H),

[0033] Wherein, θ does not exceed 60 degrees, the length of the tower 12 is longer than the radius of the wind turbine blade 11; the wind turbine blades 11 face the same direction and face the center line direction of the floating structure where the vertical truss is located, and the center height of the wind turbine blades 11 arranged on the vertical truss is higher than the center height of the wind turbine blades 11 arranged on the two inclined trusses;

[0034] Specifically, refer to Figure 2The side of the upper plane truss 24 between the vertical truss and the inclined truss is not in the same vertical plane as the side of the submerged truss 23, and the side of the upper plane truss 24 between the two inclined trusses is in the same vertical plane as the side of the submerged truss 23. The vertical truss is used for single-point mooring, and the inclined truss fits the assembly angle of the tower 12, which is optimized from the perspective of structural continuity, thereby improving the supporting stiffness of the truss and avoiding vibration during blade rotation, which may cause damage to the wind turbine host.

[0035] In a further embodiment, referring to Figure 2 , a plurality of diagonal braces are provided in the submersible truss 23 and the upper plane truss 24, and the diagonal braces divide the submersible truss 23 and the upper plane truss 24 into four triangular areas; a plurality of platform installation docking interfaces are welded in the triangular area of ​​the upper plane truss 24, and the platform installation docking interfaces are connected to the tower 12, and the photovoltaic power generation platform 3 is riveted to the platform installation docking interfaces through the support frame;

[0036] Specifically, the photovoltaic power generation platform 3 can be set as a curved surface or an angled surface. The photovoltaic power generation platform 3 in the form of a curved surface is a curved surface with a high middle and low edges, and the photovoltaic power generation platform 3 in the form of an angled surface is set as an angled surface with a high middle and low surroundings.

[0037] In a further embodiment, referring to Figure 3 A single-point mooring column 41 is provided in the vertical truss. The upper end of the single-point mooring column 41 is connected to the tower 12, and the lower end is connected to and extends out of the column truss 21 with a mooring rope 42.

[0038] In a further embodiment, the upper plane truss 24, the column truss 21 and the diagonal brace 22 are all fully watertight structures, and watertight partition bulkheads are provided on three sides of the submersible truss 23. The watertight partition bulkheads divide the single side of the submersible truss 23 into multiple independent watertight compartments, and a ballast system is configured in the watertight compartments.

[0039] Example

[0040] In this embodiment, the wind energy capture device uses a large megawatt-class wind turbine wind power generation system, and the diagonal braces inside the upper plane truss 24 divide the photovoltaic power generation platform 3 into four independent power generation platforms. The photovoltaic power generation platform 3 is installed and disassembled by hoisting;

[0041] The truss system in this embodiment is relatively large in scale, and the scale and plate thickness of the upper plane truss 24, the submersible truss 23 and the column truss 21 are similar. The diagonal brace 22 is an ordinary truss structure and is connected to the large-scale truss system by an ordinary welding method. The upper plane trusses 24, the upper plane trusses 24 and the column trusses 21, and the submersible trusses 23 are connected by ordinary welding. The column truss 21 and the submersible truss 23 are connected by full penetration welding, and anti-corrosion is provided near the welding connection position.

[0042] The parameters of each part in this embodiment are as follows:

[0043]

[0044] According to calculations, in the solution proposed in this embodiment, the installed capacity of the marine floating wind turbine is 21MW, and the photovoltaic power generation capacity is 6MW. Compared with the existing offshore photovoltaic power generation platform, the air gap is larger, and the power generation capacity is increased by nearly 10 times. At the same time, the mooring arrangement and equipment are cancelled, which greatly reduces the cost of offshore photovoltaic power generation.

[0045] The design scheme of the deep-sea floating wind turbine with large megawatt parallel multi-impellers of the present invention has a large wind receiving area of ​​the blades, a stable wind flow field, the quality and capture density of wind energy between the multi-impeller wind turbines are independent of each other, the reliability of power generation is greatly enhanced, and the center of gravity of the whole system is low. In addition, after the floating body adopts the truss form, the amplitude of the wave-current induced movement is greatly reduced, and the weight and cost of steel are reduced; in addition, an offshore photovoltaic power generation interface is provided above the truss structure, and the photovoltaic platform is fixed to the floating wind turbine foundation by riveting, thereby avoiding fatigue damage caused by welding. At the same time, due to the large size of the floating wind turbine, the air gap requirement of the photovoltaic platform is easily guaranteed on this basis. Through the technical scheme proposed by the present invention, wind energy and light energy are more closely combined, which not only greatly increases the air gap between the photovoltaic panel and the water surface, reduces air salinity corrosion, avoids wave slamming, and prevents the photovoltaic components from being affected by sea surface debris, but also uses the floating wind turbine foundation to provide positioning for the photovoltaic platform, thereby reducing the mooring cost of the existing offshore photovoltaic power generation platform.

[0046] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. An integrated floating platform for deep sea multi-impeller wind turbines and offshore photovoltaic power generation, characterized in that: The invention comprises a wind energy capture device, a floating structure and a photovoltaic power generation platform (3), wherein the floating structure comprises a column truss (21), a diagonal brace (22), a submersible truss (23) and an upper plane truss (24), wherein the submersible truss (23) is located at the bottom of the floating structure, and the upper plane truss (24) is located at the top of the floating structure, wherein the submersible truss (23) and the upper plane truss (24) are connected at the corners by the column truss (21), and the sides of the submersible truss (23) and the upper plane truss (24) are connected by a plurality of diagonal braces (22), wherein the wind energy capture device is arranged on the column truss (21), and the photovoltaic power generation platform (3) covers the upper plane truss (24).

2. The integrated floating platform for deep sea multi-impeller wind turbines and offshore photovoltaic power generation according to claim 1 is characterized in that: The floating structure is a triangular frame, and the diagonal brace (22), the submersible truss (23) and the upper plane truss (24) form a triangular support structure.

3. The integrated floating platform for deep sea multi-impeller wind turbines and offshore photovoltaic power generation according to claim 2 is characterized in that: A plurality of diagonal bracing rods are arranged inside the submersible truss (23) and the upper plane truss (24), and the diagonal bracing rods divide the submersible truss (23) and the upper plane truss (24) into four triangular areas.

4. The integrated floating platform for deep sea multi-impeller wind turbines and offshore photovoltaic power generation according to claim 3 is characterized in that: A plurality of platform installation docking interfaces are provided in the triangular region of the upper plane truss (24), the platform installation docking interfaces are connected to the tower (12), and the photovoltaic power generation platform (3) is riveted to the platform installation docking interfaces via a support frame.

5. The integrated floating platform for deep sea multi-impeller wind turbines and offshore photovoltaic power generation according to claim 2 is characterized in that: The wind energy capture device comprises a wind turbine blade (11) and a tower (12), wherein the bottom of the tower (12) is connected to the upper end of a column-type truss (21), and the wind turbine blade (11) is connected to the upper end of the tower (12).

6. The integrated floating platform for deep sea multi-impeller wind turbines and offshore photovoltaic power generation according to claim 5 is characterized in that: The column-type truss (21) comprises a vertical truss and two inclined trusses. The upper ends of the inclined trusses are inclined outwards, and the towers (12) connected thereto are inclined outwards at the same angle.

7. The integrated floating platform for deep sea multi-impeller wind turbines and offshore photovoltaic power generation according to claim 6 is characterized in that: The minimum angle θ between the tower (12) and the plumb bob direction is determined according to the side length L of the upper plane truss (24), the diameter D of the fan blade (11) and the tower height H. The diameter D of the fan blade (11) is the maximum diameter of the blade rotation envelope circle. The specific formula is: θ=arcsin((LD) / 2H), Wherein, θ does not exceed 60 degrees, and the length of the tower (12) is longer than the radius of the wind turbine blade (11).

8. The integrated floating platform for deep sea multi-impeller wind turbines and offshore photovoltaic power generation according to claim 7 is characterized in that: A single-point mooring column (41) is arranged in the vertical truss. The upper end of the single-point mooring column (41) is connected to the tower (12), and the lower end is connected to and extends out of the column-type truss (21) and has a mooring rope (42).

9. The integrated floating platform for deep sea multi-impeller wind turbines and offshore photovoltaic power generation according to claim 7, characterized in that: The fan blades (11) face the same direction and face the center line direction of the floating structure where the vertical truss is located. The center height of the fan blades (11) arranged on the vertical truss is higher than the center height of the fan blades (11) arranged on the two inclined trusses.

10. The integrated floating platform for deep sea multi-impeller wind turbines and offshore photovoltaic power generation according to claim 1, characterized in that: The upper plane truss (24), the column truss (21) and the diagonal brace (22) are all fully watertight structures. The three sides of the submersible truss (23) are provided with watertight bulkheads. The watertight bulkheads divide the single side of the submersible truss (23) into a plurality of independent watertight compartments. The watertight compartments are provided with ballast systems.

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