Single-blade hyperboloid structure floating foundation and offshore floating wind turbine system

Abstract

The present invention discloses a single-blade hyperboloid structure floating foundation and an offshore floating wind turbine system, including a foundation body and a damper. The foundation body is a single-blade hyperboloid structure as a whole, including an upper disc platform, a middle disc platform, a lower disc platform, a foundation support, an arc-shaped diagonal brace and an inclined buoy. The upper disc platform, the middle disc platform and the lower disc platform are arranged in sequence from top to bottom. The center of the upper disc platform and the middle disc platform is connected by the foundation support, and the outer periphery of the upper disc platform and the outer periphery of the middle disc platform are connected by an arc-shaped diagonal brace. A damper is arranged between the foundation support and the arc-shaped diagonal brace, and a plurality of inclined buoys are arranged circumferentially between the outer periphery of the middle disc platform and the outer periphery of the lower disc platform. The present invention can effectively avoid the enhancement of the pitch, roll and heave motion response of the wind turbine system, effectively improve its stability, and does not need to increase the foundation size and the length of the mooring system, and has good economy.

Description

Technical Field

[0001] The present invention relates to the technical field of offshore wind turbines, and in particular to a single-blade hyperboloid structure floating foundation and an offshore floating wind turbine system. Background Art

[0002] Today's energy crisis is getting worse and worse. Wind energy, as a clean and renewable energy, has become a hot spot for new energy development. According to the global distribution of wind resources, offshore wind resources are abundant. Wind turbines, as one of the main forms of wind energy utilization, have great development prospects. Offshore wind turbines are divided into fixed wind turbines and floating wind turbines. Fixed wind turbines are affected by water depth and geological conditions, and the utilization of deep sea wind resources is limited. Therefore, the emergence of floating wind turbines provides a solution for the development and utilization of deep sea wind resources.

[0003] my country's existing floating wind turbines were developed relatively late, and existing prototypes use a three-buoy semi-submersible floating foundation design, but they are only suitable for areas with stable offshore wind resources. my country's sea areas are of medium water depth and are often affected by typhoons, which causes floating wind turbines to be affected by multiple factors such as wind, waves and currents, resulting in pitch, roll and heave, increasing fatigue damage to their variable pitch and yaw systems, and placing higher requirements on the stability of the control system. In order to ensure its stability, it is often necessary to increase the foundation size and mooring system length, resulting in increased economic costs. Summary of the invention

[0004] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a single-leaf hyperboloid structure floating foundation and an offshore floating wind turbine system. By adopting a single-leaf hyperboloid structure floating foundation, the enhancement of the pitch, roll and heave motion response of the wind turbine system can be effectively avoided, and its stability can be effectively improved without increasing the foundation size and the length of the mooring system, and the economy is good.

[0005] The first object of the present invention is to provide a single-leaf hyperboloid structure floating foundation.

[0006] A second object of the present invention is to provide an offshore floating wind turbine system.

[0007] The first object of the present invention can be achieved by adopting the following technical solutions:

[0008] A floating foundation with a single-leaf hyperboloid structure comprises a foundation body and a damper arranged inside the foundation body. The foundation body is a single-leaf hyperboloid structure as a whole, comprising an upper disc platform, a middle disc platform, a lower disc platform, a foundation support, an arc-shaped diagonal brace and an inclined buoy. The upper disc platform, the middle disc platform and the lower disc platform are arranged in sequence from top to bottom. The centers of the upper disc platform and the middle disc platform are connected by the foundation support, and the outer circumference of the upper disc platform and the outer circumference of the middle disc platform are connected by the arc-shaped diagonal brace. A closed cavity is formed between the upper disc platform, the middle disc platform and the arc-shaped diagonal brace, which is used as a floating body to provide main buoyancy. A damper is arranged between the foundation support and the arc-shaped diagonal brace, and a plurality of inclined buoys are arranged circumferentially at intervals between the outer circumference of the middle disc platform and the outer circumference of the lower disc platform.

[0009] Furthermore, the lower disc platform is a box-type ballast tank, which adopts a hollow sandwich steel-concrete structure and is composed of four fan-shaped units. Two adjacent fan-shaped units are connected by a universal joint to achieve multi-degree-of-freedom movement. Two cable guide holes are provided on the outer circumference of each fan-shaped unit, and a slide rail is provided on the outer circumference and between the two cable guide holes. A slider is provided in each slide rail, and the slider is connected to an underwater anchoring device through a cable. The required cable guide hole is selected according to actual needs and connected to the underwater anchoring device through a cable.

[0010] Furthermore, the slider is in a T-shaped structure, one side of which is used to connect the cable, and an elastic clamping point is arranged on the outer side of the other side. The slide rail is a concave groove structure, and a clamping groove matching the elastic clamping point is formed inside it. When the wind turbine system moves, the cable connected to the slider is subjected to force so that the elastic clamping point pops out when the slider moves to the clamping groove position, thereby fixing the cable.

[0011] Furthermore, the length of the slide rail is one eighth of the circumference of the lower disc platform.

[0012] Furthermore, a drainage pump is provided in the inclined buoy, and the inclined buoy is used as a dynamic ballast tank. The ballast water in the inclined buoy is dynamically adjusted by the drainage pump according to the load state of the wind turbine system.

[0013] Furthermore, the upper disc platform and the middle disc platform are both steel-concrete semi-submersible platform structures.

[0014] Furthermore, the cross section of the base support is cylindrical or triangular prism structure.

[0015] The second object of the present invention can be achieved by adopting the following technical solutions:

[0016] An offshore floating wind turbine system comprises a wind rotor, a nacelle, a tower, a plurality of cables, an anchoring device and the above-mentioned single-blade hyperboloid structure floating foundation, wherein the wind rotor is connected to the nacelle and installed on the upper part of the tower, the lower part of the tower is fixed on the upper disc platform of the single-blade hyperboloid structure floating foundation, and the four sides of the single-blade hyperboloid structure floating foundation are connected to the anchoring devices arranged underwater through a plurality of cables.

[0017] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0018] 1. The floating foundation of the present invention has a single-blade hyperboloid structure as a whole, and is composed of three layers of disc platforms: upper, middle and lower. It has the characteristics of small waterline area and high initial stability, and its pitch natural frequency is low. At the same time, the layered design does not require additional heave plates, and the structure is simple, which improves the economy of the whole machine. The floating foundation of the single-blade hyperboloid structure is also equipped with a damper to adjust the overall frequency of the floating foundation, which can effectively reduce the pitch, roll and heave motion responses, reduce the increase in fatigue damage of the variable pitch and yaw systems, and improve the service life.

[0019] 2. The lower disc platform of the present invention has a large volume and can effectively increase the viscous damping. As a box-type ballast tank, it increases the additional mass through ballast water, lowers the center of gravity of the foundation, and enhances the stability of the foundation structure. It adopts a hollow sandwich steel-concrete structure and is composed of four fan-shaped units. The two adjacent fan-shaped units are connected by universal joints to achieve multi-degree-of-freedom movement. The design of the cable guide hole and the slide rail on its periphery can reduce the force on a part of the cable and the anchoring device, avoid fatigue of the mooring system, increase the service life, improve the stability of the wind turbine system, and improve the economy of the whole machine.

[0020] 3. In the present invention, a plurality of inclined buoys are arranged at intervals along the circumferential direction between the middle disc platform and the lower disc platform. Each inclined buoy is equipped with a drainage pump, so that the ballast water in the inclined buoy can be dynamically adjusted according to the load state of the wind turbine system. The inclined buoy is used as a dynamic ballast tank, which enhances the environmental adaptability of the wind turbine system. At the same time, by adjusting the ballast water, the frequency of the floating foundation can be adjusted to avoid the enhancement of the pitch and roll motion response. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the overall structure of the single-blade hyperboloid structure floating foundation and the offshore floating wind turbine system of the present invention.

[0022] Figure 2 It is a top view of the lower disc platform of the present invention.

[0023] Figure 3 It is a structural schematic diagram of the slide rail of the present invention.

[0024] Figure 4 It is a cross-sectional view of the slide rail of the present invention.

[0025] Figure 5 It is a structural schematic diagram of the slider of the present invention. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0027] like Figures 1 to 5 As shown, this embodiment provides a single-leaf hyperboloid structure floating foundation, including a foundation body and a damper arranged inside the foundation body, the foundation body as a whole is a single-leaf hyperboloid structure, including an upper disc platform 1, a middle disc platform 2, a lower disc platform 3, a foundation support 4, an arc-shaped diagonal brace 5 and an inclined buoy 6, the upper disc platform 1, the middle disc platform 2 and the lower disc platform 3 are arranged in sequence from top to bottom, the upper disc platform 1 is connected to the middle disc platform 2 at the center through the foundation support 4, and the outer periphery of the upper disc platform 1 is connected to the outer periphery of the middle disc platform 2 through the arc-shaped diagonal brace 5, and the upper disc platform 1, the middle disc platform 2 and the arc-shaped diagonal brace 5 form a The closed cavity is used as a float to provide the main buoyancy. Generally, the middle disc platform 2 is located at the waterline position at sea level. The volume of the middle disc platform 2 is the smallest, thereby reducing the waterline area of ​​the foundation, improving its initial stability, and its pitch natural frequency is relatively low; wherein, a damper 7 (including but not limited to a spring damper, etc.) is provided between the foundation support 4 and the arc-shaped diagonal brace 5, and the number of dampers is adjusted according to the specific use environment to ensure that the safety and economy of the wind turbine system are optimized; a plurality of inclined buoys 6 are circumferentially spaced between the outer periphery of the middle disc platform 2 and the outer periphery of the lower disc platform 3, and the inclined buoys 6 and the arc-shaped diagonal brace 5 form a single-leaf hyperbolic shape.

[0028] Specifically, the lower disc platform 3 is relatively large in size and can effectively increase the viscous damping. It serves as a box-type ballast tank and is filled with ballast water to ensure the stability of the foundation. It adopts a hollow sandwich steel-concrete structure and is composed of four fan-shaped units 301. Two adjacent fan-shaped units 301 are connected by a universal joint 302 to achieve multi-degree-of-freedom movement, thereby enhancing the adaptability of the wind turbine system to hydrodynamic loads. Two cable guide holes 303 are provided on the outer peripheral surface of each fan-shaped unit 301, and a slide rail 304 is provided on the outer peripheral surface and between the two cable guide holes 303 along the circumferential direction. The required cable guide holes are selected according to actual needs and connected to the underwater anchoring device through cables. A slider 305 is provided in each slide rail 304. The slider 305 is connected to the underwater anchoring device through a cable, and the cable is driven to slide along the slide rail through the slider.

[0029] Specifically, the slider 305 is a T-shaped structure, one side 3051 of which is used to connect the cable, and an elastic clamping point 3053 is arranged on the outer side of the other side 3052. The slide rail 304 is a concave groove structure, and the length of the slide rail is one eighth of the circumference of the lower disc platform 3. A clamping groove 3041 matching the elastic clamping point 3053 is formed inside the slide rail. When the wind turbine system moves, the cable connected to the slider is subjected to force so that the elastic clamping point pops out when the slider moves to the clamping groove position, thereby fixing the cable.

[0030] Specifically, a drainage pump 8 is provided in the inclined buoy 6, and the inclined buoy 6 is used as a dynamic ballast tank. The ballast water in the inclined buoy 6 is dynamically adjusted through the drainage pump according to the load state of the wind turbine system, which can effectively enhance the environmental adaptability of the wind turbine system. At the same time, by adjusting the ballast water, the frequency of the floating foundation can be adjusted to avoid the enhancement of the pitch and roll motion response.

[0031] Specifically, the upper disc platform 1 and the middle disc platform 2 are both steel-concrete semi-submersible platform structures.

[0032] Specifically, the cross section of the base support 4 is cylindrical or triangular prism structure.

[0033] The present embodiment also provides an offshore floating wind turbine system, comprising a wind rotor 9, a nacelle 10, a tower 11, a plurality of cables 12, an anchoring device 13 and the above-mentioned single-blade hyperboloid structure floating foundation, wherein the wind rotor 9 is connected to the nacelle 10 and is installed on the upper part of the tower 11, the lower part of the tower 11 is fixed on the upper disc platform 1 of the single-blade hyperboloid structure floating foundation, and the single-blade hyperboloid structure floating foundation is connected to the anchoring device 13 arranged underwater by a plurality of cables 12 on all four sides.

[0034] Specifically, the cable 12 is a spring chain or a common chain.

[0035] In this embodiment, the specific dimensions of the three-layer disc platform are determined based on the overall structural design and calculation analysis of the floating foundation to ensure the overall structural stability of the wind turbine system. At the same time, the outer surface of the wind turbine system is provided with a corrosion-resistant layer to prevent damage to the components caused by seawater corrosion, thereby improving the service life and safety of the wind turbine system.

[0036] In addition to the implementation methods of the above-mentioned embodiments, the present invention may also have other similar methods or equivalent changes. Possible changes include: the type of cables and dampers, the connection method of cables and foundations, etc.

[0037] The above is only a preferred embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical solution and invention concept of the present invention within the scope disclosed by the present invention, which shall fall within the protection scope of the present invention.

Claims

1. A single-leaf hyperboloid structure floating foundation, characterized in that: The wind turbine of the present invention comprises a main body and a damper arranged inside the main body, wherein the main body has a single-leaf hyperboloid structure as a whole, and comprises an upper disc platform, a middle disc platform, a lower disc platform, a basic support, an arc-shaped diagonal brace and an inclined buoy, wherein the upper disc platform, the middle disc platform and the lower disc platform are sequentially spaced from top to bottom, the upper disc platform and the middle disc platform are connected at the center by the basic support, and the outer circumference of the upper disc platform and the outer circumference of the middle disc platform are connected by the arc-shaped diagonal brace, and a closed cavity is formed between the upper disc platform, the middle disc platform and the arc-shaped diagonal brace, which is used as a floating body to provide main buoyancy, a damper is arranged between the basic support and the arc-shaped diagonal brace, and a plurality of inclined buoys are circumferentially spaced between the outer circumference of the middle disc platform and the outer circumference of the lower disc platform, a drainage pump is arranged inside the inclined buoy, and the inclined buoy is used as a dynamic ballast tank, and the ballast water in the inclined buoy is dynamically discharged through the drainage pump according to the load state of the wind turbine system. Adjustment, the lower disc platform is a box-type ballast tank, which adopts a hollow sandwich steel-concrete structure and is composed of four fan-shaped units. Two adjacent fan-shaped units are connected by a universal joint to achieve multi-degree-of-freedom movement. The outer circumference of each fan-shaped unit is provided with two cable guide holes, and a slide rail is provided on its outer circumference and between the two cable guide holes. The length of the slide rail is one-eighth of the circumference of the lower disc platform. A slider is provided in each slide rail, and the slider is connected to the underwater anchoring device through a cable. The required cable guide hole is selected according to actual needs and connected to the underwater anchoring device through the cable. The slider is in a T-shaped structure, one side of which is used to connect the cable, and an elastic card point is provided on the outside of the other side. The slide rail is a concave groove structure, and a card groove matching the elastic card point is formed inside it. When the wind turbine system moves, the cable connected to the slider is subjected to force so that the elastic card point pops out when the slider moves to the card groove position, thereby fixing the cable.

2. The single-leaf hyperboloid structure floating foundation according to claim 1 is characterized by: The upper disc platform and the middle disc platform are both steel-concrete semi-submersible platform structures.

3. The single-leaf hyperboloid structure floating foundation according to claim 1 is characterized by: The cross section of the basic support is cylindrical or triangular prism structure.

4. An offshore floating wind turbine system, characterized in that: The invention comprises a wind wheel, a nacelle, a tower, a plurality of cables, an anchoring device and a single-blade hyperboloid structure floating foundation as described in any one of claims 1 to 3, wherein the wind wheel is connected to the nacelle and installed on the upper part of the tower, the lower part of the tower is fixed to the upper disc platform of the single-blade hyperboloid structure floating foundation, and the four sides of the single-blade hyperboloid structure floating foundation are connected to the anchoring devices arranged underwater through a plurality of cables.

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