Floating type fan foundation platform capable of absorbing wave flow energy

Abstract

The invention belongs to the technical field of offshore wind power, and particularly discloses a floating type fan foundation platform capable of absorbing wave flow energy, which comprises a middle buoy and a plurality of outer buoys annularly distributed on the peripheral side of the middle buoy, and the outer buoys are fixedly connected with the middle buoy through connecting beams; each buoy is movably connected with an energy absorption bracket, and the energy absorption bracket comprises a middle sleeve arranged on the middle buoy in a sleeving manner, an outer sleeve arranged on the outer buoy in a sleeving manner, and a supporting rib plate fixedly connected with the middle sleeve and the outer sleeve; an electromagnetic coil is sealed in the outer sleeve, a permanent magnet is fixed in the outer buoy, and the electromagnetic coil and the permanent magnet are matched to be used for converting reciprocating motion kinetic energy of the energy absorption support into electric energy; the energy-absorbing buoy sleeves the periphery of the middle buoy and is positioned at the bottom of the energy-absorbing bracket; and the energy-absorbing buoy is used for driving the energy-absorbing bracket to reciprocate along the axial direction of the middle buoy. The stability of the platform in a complex marine environment is remarkably improved, the influence of vortex-induced vibration and large-amplitude motion on the draught fan is reduced, wave and water flow energy can be recycled, and electric power is generated.

Description

Technical Field

[0001] The present invention relates to the technical field of offshore wind power, and in particular to a floating wind turbine foundation platform capable of absorbing wave and current energy. Background Art

[0002] As a key component of clean energy, the development and utilization of offshore wind power is crucial for optimizing the energy mix and reducing carbon emissions. The stability and reliability of wind turbine foundation platforms, the key structures supporting offshore wind turbines, directly impact their operating efficiency and service life. As offshore wind power expands into deep waters, floating wind turbine foundation platforms capable of absorbing wave and current energy have become a key focus of technological research and development due to their robust adaptability to water depths and flexible installation.

[0003] Traditional floating wind turbine foundation platforms that can absorb wave and current energy usually adopt semi-submersible, column-type or tension-leg-type structures, and maintain the stability of the platform through an anchoring system. However, in a complex marine environment, the platform is susceptible to loads such as waves and currents, which produce vortex-induced vibrations and large movements, which not only affect the power generation efficiency of the wind turbine, but may also cause structural fatigue problems. Existing technologies mainly suppress vibrations by optimizing the platform structure or adding damping devices, but these methods often cannot take into account both vibration reduction effects and energy capture. Therefore, the development of a new technical solution that can both reduce platform movement and efficiently utilize environmental energy is of great significance to improving the economy and reliability of floating wind turbines. Summary of the Invention

[0004] The purpose of the present invention is to provide a floating wind turbine foundation platform that can absorb wave and current energy, so as to solve the above-mentioned technical problems existing in the prior art.

[0005] To achieve the above-mentioned objectives, the present invention provides the following solution: a floating wind turbine foundation platform capable of absorbing wave and current energy, comprising a middle pontoon, a plurality of outer pontoons distributed in a circular array around the middle pontoon, and the plurality of outer pontoons being fixedly connected to the middle pontoon through connecting beams; an energy-absorbing bracket is also movably connected to the middle pontoon and the outer pontoon, and the energy-absorbing bracket comprises a middle sleeve mounted on the middle pontoon, an outer sleeve mounted on the outer pontoon, and a supporting rib fixedly connecting the middle sleeve and the outer sleeve; an electromagnetic coil is sealed in the outer sleeve, and a permanent magnet is fixed in the outer pontoon, and the electromagnetic coil and the permanent magnet cooperate to convert the reciprocating motion kinetic energy of the energy-absorbing bracket into electrical energy; and also comprises an energy-absorbing pontoon mounted on the outer periphery of the middle pontoon and located at the bottom of the energy-absorbing bracket, and the energy-absorbing pontoon is used to drive the energy-absorbing bracket to reciprocate along the axial direction of the middle pontoon.

[0006] The above technical solution converts the reciprocating motion kinetic energy of the energy-absorbing bracket into electrical energy through the coordination of the intermediate buoy, outer buoy, energy-absorbing bracket, electromagnetic coil and permanent magnet, as well as the setting of the energy-absorbing buoy, thereby realizing energy recovery and improving the stability of the platform, and effectively solving the problem that the existing floating wind turbine foundation platform that can absorb wave and current energy is susceptible to vortex-induced vibration and large-scale movement caused by waves and currents in complex marine environments.

[0007] Furthermore, the energy-absorbing buoys are secured to their outer circumferences with multiple spoiler blades, designed to absorb the impact of seawater and convert it into rotational force for the buoys. These spoiler blades absorb the impact of seawater and convert it into rotational force for the buoys, further reducing the impact of waves on the platform and vortex-induced vibrations, while also providing additional vibration reduction and energy recovery for the platform.

[0008] Furthermore, the energy-absorbing support's support ribs are rotatably connected to multiple oscillating hydrofoils, which are rotatably connected to the support ribs via a rotating shaft. These oscillating hydrofoils utilize a low-speed airfoil profile with a rounded tip and a pointed tail. The rounded end of each hydrofoil is provided with a through-circular cavity and is connected to the rotating shaft via a self-aligning ball bearing. The oscillating hydrofoils passively rotate about the rotating shaft to change their buoyancy angle, generating thrust in the opposite direction of the seawater load. This provides additional lift for the energy-absorbing support, assists electromagnetic induction between the outer sleeve and the outer buoy, and enhances the platform's stability and energy capture efficiency.

[0009] Furthermore, the unidirectional array of oscillating hydrofoils is distributed at the bottom of the supporting ribs, with multiple oscillating hydrofoils arranged equidistantly. This unidirectional and equidistant arrangement enables the oscillating hydrofoils to generate thrust and lift more evenly and effectively when subjected to wave and current loads, further improving the stability of the platform and enhancing energy recovery. The layout of the oscillating hydrofoils is also optimized, enabling them to effectively reduce vibration and capture energy under the influence of water flows from different directions.

[0010] Furthermore, at least one vortex-induced oscillator is rotatably connected to the outside of the outer buoy, and a power generation unit is integrated inside the vortex-induced oscillator for converting the swinging mechanical energy of the vortex-induced oscillator into electrical energy, further improving the energy recovery efficiency of the platform and providing additional auxiliary power for the platform. At the same time, the swinging of the vortex-induced oscillator disrupts the formation of regular vortex streets, disperses water flow energy, reduces the vibration amplitude of the outer buoy, and enhances the stability of the platform.

[0011] Furthermore, the vortex-induced oscillator is designed as a streamlined oscillator with a teardrop-shaped cross-section, comprising a water-facing curved surface, a drainage surface, and a drainage tip. The water-facing curved surface guides the water flow for smooth separation. This structure of the vortex-induced oscillator more efficiently converts water flow energy into mechanical energy and further into electrical energy, improving energy conversion efficiency while reducing water resistance on the oscillator, allowing it to oscillate more smoothly.

[0012] Furthermore, the diversion tip is at an acute angle, which further accelerates the separation of water flow to form periodic alternating vortices, more effectively promotes the swing of the vortex-induced oscillator, and enhances the power generation efficiency. At the same time, this design can better disrupt the formation of regular vortex streets, more significantly reduce the vibration amplitude of the outer buoy, and further improve the stability of the platform.

[0013] Furthermore, the power generation unit includes a permanent magnet array and an electromagnetic coil, which realizes electromagnetic conversion and outputs electrical energy through the swing of the vortex-excited oscillator and the cooperation between the permanent magnet array and the electromagnetic coil. This power generation method has a simple structure and high reliability, can operate stably in a complex marine environment, and effectively converts the swinging mechanical energy of the vortex-excited oscillator into electrical energy to provide auxiliary power for the platform. At the same time, it avoids the gear transmission coordination of the traditional mechanical transmission power generation structure, reduces the corrosion and seizure problems in the marine environment, and improves the power generation efficiency and system reliability.

[0014] Furthermore, the ratio of the number of the intermediate buoys to the outer buoys is 1:3. This proportional design makes the platform structure more stable, rationally distributes buoyancy and load-bearing capacity, and optimizes the platform's mechanical performance and motion response, making it more adaptable and stable in complex marine environments, and helping to improve the operating efficiency and service life of the wind turbine.

[0015] Furthermore, the connecting beam includes a main support, a top transverse support, a diagonal support, a base, and a bottom transverse support. The main support connects two adjacent outer pontoons, the top transverse support connects the outer pontoons and the middle pontoon, the base is fixed to the bottom of the middle pontoon, the bottom transverse support connects the outer pontoons and the base, and the diagonal support connects the main support and the base. The connecting beam of the above structure forms a stable truss structure that can effectively connect the middle pontoons and the outer pontoons, enhance the overall rigidity and stability of the platform, and improve the platform's ability to withstand wind and waves. At the same time, this structural design also helps to reasonably distribute the load, optimize the platform's mechanical properties, and ensure the platform's safety and reliability in complex marine environments.

[0016] Compared with the prior art, the present invention has at least the following beneficial effects:

[0017] This invention innovatively integrates energy recovery and vibration reduction technologies, including energy-absorbing buoys, oscillating hydrofoils, and vortex-induced vibrators, to achieve an integrated "vibration suppression-energy recovery-active regulation" solution for a floating wind turbine foundation platform capable of absorbing wave and current energy. This solution not only significantly improves the platform's stability in complex marine environments and reduces the impact of vortex-induced vibration and large-scale motion on the wind turbine's power generation efficiency, but also efficiently recovers wave and current energy, providing 20% ​​to 30% of auxiliary power to the platform. This also extends the service life of the platform structure and reduces construction and maintenance costs, providing efficient and reliable technical support for deep-sea wind power development. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0019] Figure 1 This is a front view of a floating wind turbine foundation platform capable of absorbing wave and current energy according to Example 1 of the present invention;

[0020] Figure 2 This is a right side view of the floating wind turbine foundation platform capable of absorbing wave and current energy according to Example 1 of the present invention;

[0021] Figure 3 A top view of a floating wind turbine foundation platform capable of absorbing wave and current energy according to Example 1 of the present invention;

[0022] Figure 4 This is an axonometric view of a floating wind turbine foundation platform capable of absorbing wave and current energy according to Example 1 of the present invention;

[0023] Figure 5 This is a schematic structural diagram of the connection frame in Example 1 of the present invention;

[0024] Figure 6 This is a schematic structural diagram of the energy-absorbing bracket in Example 1 of the present invention;

[0025] Figure 7 Schematic diagram of the structure of the energy-absorbing buoy in Example 1 of the present invention;

[0026] Figure 8 Schematic diagram of the structure of the vortex exciter in Example 1 of the present invention;

[0027] Figure 9 This is an axonometric view of a floating wind turbine foundation platform capable of absorbing wave and current energy according to Example 2 of the present invention;

[0028] Figure 10 Schematic diagram of the structure of the energy absorbing bracket in Example 2 of the present invention;

[0029] Figure 11 Schematic diagram of the structure of the oscillating hydrofoil in Example 2 of the present invention.

[0030] In the figure: 1. middle buoy; 2. outer buoy; 3. energy-absorbing bracket; 31. middle casing; 32. supporting ribs; 33. outer casing; 34. oscillating hydrofoil; 35. rotating shaft; 4. vortex-induced vibrator; 41. water-facing arc surface; 42. diversion surface; 43. diversion tip; 44. end face; 45. rotating connecting hole; 5. energy-absorbing buoy; 51. buoy body; 52. spoiler blade; 6. connecting beam; 61. main body support; 62. top horizontal support; 63. inclined support; 64. base; 65. bottom horizontal support. DETAILED DESCRIPTION

[0031] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0032] Existing floating wind turbine foundation platforms that can absorb wave and current energy are susceptible to vortex-induced vibrations and large movements caused by waves and currents in complex marine environments, which affect power generation efficiency and may cause structural fatigue. Traditional vibration reduction methods are difficult to achieve both vibration reduction effects and energy capture. To this end, an embodiment of the present invention provides a floating wind turbine foundation platform that can absorb wave and current energy. The purpose is to achieve an integrated solution of "vibration suppression-energy recovery-active regulation" for a floating wind turbine platform by innovatively integrating vibration energy capture and passive control technology, effectively solving the key problems in the background technology.

[0033] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0034] Example 1

[0035] Reference Figures 1 to 8As shown, Embodiment 1 of the present invention provides a floating wind turbine foundation platform capable of absorbing wave and current energy. It utilizes a three-buoy semi-submersible structure, with a central buoy 1 connected to the wind turbine tower and three outer buoys 2 arranged in an equilateral triangle. These buoys are connected to a central node via a connecting beam 6. An energy-absorbing buoy 5 and an energy-absorbing support 3 are sleeved onto the body of the central buoy 1. The energy-absorbing buoy 5 is located at the bottom of the energy-absorbing support 3 and is used to drive the energy-absorbing support 3 to reciprocate axially along the central buoy 1. The energy-absorbing support 3 includes a central sleeve 31 sleeved around the outer periphery of the central buoy 1 and an outer sleeve 33 sleeved around the outer peripheries of the three outer buoys 2. The outer sleeve 33 is fixedly connected to the central sleeve 31 via support ribs 32. Electromagnetic coils are sealed within the three outer sleeves 33, and correspondingly, permanent magnets are fixed within the three outer buoys 2. When the energy-absorbing support 3 reciprocates up and down under the influence of waves, the three outer sleeves 33 convert the kinetic energy of this reciprocating motion into electrical energy. A self-aligning ball bearing is provided between the energy-absorbing buoy 5 and the intermediate buoy 1, so that the energy-absorbing buoy 5 can rotate freely. A plurality of spoiler blades 52 are fixedly connected to the outer peripheral surface of the energy-absorbing buoy 5, which are used to absorb the impact of sea water and convert the unidirectional impact force into the rotational force of the energy-absorbing buoy 5, thereby reducing the impact of waves on the intermediate buoy 1 and reducing vortex-induced vibration. At the same time, the energy-absorbing buoy 5 rises, driving the energy-absorbing bracket 3 to rise upward, and completing power generation through the electromagnetic cooperation between the outer sleeve 33 and the outer buoy 2.

[0036] In a specific embodiment, Figure 5 As shown, the middle pontoon 1 and the outer pontoon 2 are connected and fixed by a connecting beam 6. The connecting beam 6 includes a main support 61 connecting two adjacent outer pontoons 2, a top transverse support 62 connecting the outer pontoons 2 and the middle pontoon 1, a base 64 fixed to the bottom of the middle pontoon 1, a bottom transverse support 65 connecting the outer pontoons 2 and the base 64, and a diagonal support 63 connecting the main support 61 and the base 64. The main support 61 and the top transverse support 62 are in the same horizontal plane and are fixed near the top of the outer pontoon 2. The base 64 is fixedly connected to the bottom end of the middle pontoon 1, the bottom transverse support 65 is connected to the base 64 at one end and to the bottom end of the outer pontoon 2 at the other end, and the diagonal support 63 is fixed to the midpoint of the main support 61 at one end and fixed to the base 64 at the other end.

[0037] In a specific embodiment, Figure 6As shown, the energy absorbing bracket 3 includes an intermediate sleeve 31, support ribs 32 and an outer sleeve 33. Among them, the intermediate sleeve 31 is sleeved on the outer peripheral side of the intermediate pontoon 1. It is the core component of the energy absorbing bracket 3, which plays the role of connection and support, and allows the energy absorbing bracket 3 to reciprocate axially along the intermediate pontoon 1. The outer sleeve 33 is sleeved on the outer peripheral side of the three outer pontoons 2, and is fixedly connected to the intermediate sleeve 31 through the support ribs 32. An electromagnetic coil is sealed inside the outer sleeve 33, which is used to convert the kinetic energy of the up and down reciprocating motion of the energy absorbing bracket 3 into electrical energy. The support ribs 32 are used to connect the intermediate sleeve 31 and the outer sleeve 33, and play the role of fixing and supporting, ensuring the stability of the entire energy absorbing bracket 3 structure.

[0038] When the energy-absorbing buoy 5 is impacted by waves and reciprocates up and down, the energy-absorbing bracket 3 moves with it. The electromagnetic coil inside the outer sleeve 33 interacts with the permanent magnet inside the outer buoy 2, converting mechanical energy into electrical energy, achieving energy recovery. The movement of the energy-absorbing bracket 3 also mitigates the impact of waves on the intermediate buoy 1, reducing vortex-induced vibrations and thereby improving the stability of the platform.

[0039] In a specific embodiment, Figure 7 As shown, the energy-absorbing buoy 5 includes a buoy body 51 and spoiler blades 52. The buoy body 51 plays the role of buoyancy support and structural bearing. The buoy body 51 is usually a hollow cylindrical structure with sufficient buoyancy to support the weight of the entire platform and can float freely in the water. The spoiler blades 52 are fixed to the outer peripheral surface of the buoy body 51, and multiple spoiler blades 52 are evenly distributed along the circumference of the buoy body 51. These spoiler blades 52 are used to absorb the impact force of seawater and convert it into the rotational force of the buoy. The design of the spoiler blades 52 can increase the contact area between the buoy and the seawater, thereby more effectively absorbing wave energy.

[0040] The hollow design of the buoy body 51 ensures sufficient buoyancy while reducing structural weight, improving the stability and economic efficiency of the platform. A self-aligning ball bearing is installed between the energy-absorbing buoy 5 and the intermediate buoy 1. The use of the self-aligning ball bearing allows the energy-absorbing buoy 5 to rotate freely while maintaining a stable connection with the intermediate buoy 1. This bearing design allows the buoy to flexibly adjust its position when impacted by waves, reducing direct impact on the intermediate buoy 1 and thus reducing vortex-induced vibration.

[0041] On the one hand, the energy-absorbing buoy 5 absorbs the impact force of the seawater through the spoiler blades 52 on its outer peripheral surface and converts it into the rotational force of the buoy. This design can not only effectively reduce the impact of waves on the middle buoy 1, but also convert part of the wave energy into mechanical energy. On the other hand, the rotation of the energy-absorbing buoy 5 can reduce the direct impact of waves on the middle buoy 1, thereby reducing vortex-induced vibrations. This vibration reduction effect is crucial to improving the stability and service life of the floating wind turbine foundation platform that can absorb wave and current energy. At the same time, when the energy-absorbing buoy 5 reciprocates up and down, it will drive the axial movement of the middle buoy 1 of the energy-absorbing bracket 3. The electromagnetic coil and permanent magnet between the energy-absorbing bracket 3 and the outer buoy 2 interact with each other to convert mechanical energy into electrical energy, providing auxiliary power for the platform.

[0042] The energy-absorbing bracket 3 and the energy-absorbing buoy 5 are key components of the present invention's floating wind turbine foundation platform, which absorbs wave and current energy. The energy-absorbing bracket 3, in conjunction with the energy-absorbing buoy 5, achieves energy recovery and vibration reduction. The energy-absorbing buoy 5 absorbs wave energy through its spoiler blades 52 and converts it into rotational force. This buoy 5 rotates flexibly via self-aligning ball bearings, effectively reducing wave impact on the intermediate buoy 1 and minimizing vortex-induced vibrations. The coordinated movement of the two, through the interaction between the electromagnetic coil and the permanent magnet, converts mechanical energy into electrical energy, providing auxiliary power for the platform. This significantly improves the economic efficiency and reliability of the floating wind turbine foundation platform, which absorbs wave and current energy.

[0043] As a further optimization solution, in this embodiment, the outer side of each outer buoy 2 is also rotatably connected to two vortex exciters 4. Correspondingly, the outer buoy 2 is rotatably connected to the internal integrated power generation unit of the vortex exciter 4, and cooperates with the vortex exciter 4 to realize electromagnetic conversion and output electrical energy.

[0044] In a specific embodiment, Figure 8 As shown, the vortex-induced oscillator 4 is designed as a streamlined oscillating body that can capture water flow energy and convert it into oscillating mechanical energy. Its cross-section is in the shape of a water droplet, including a water-facing arc surface 41, a drainage surface 42, and a drainage tip 43. The cross-section is an end face 44, and a rotating connection hole 45 is opened through the upper and lower end faces 44. The water-facing arc surface 41 is located at the front end of the oscillator and is a smooth concave surface that guides the water flow to separate smoothly, reduces resistance and induces the initial shedding of vortices. The drainage surface 42 is an inclined plane that smoothly connects with the water-facing arc surface 41; the drainage tip 43 is at an acute angle, which accelerates the separation of water flow to form periodic alternating vortices (Karman vortex street), generating periodic lateral force to push the oscillator to swing left and right. The rotating connection hole 45 is located at the center of the oscillator and is used to be hinged to the outer buoy 2 so that the vortex-induced oscillator 4 can swing freely around the axis.

[0045] The power generation unit includes a permanent magnet array fixed to the inner wall of the outer buoy 2 and an electromagnetic coil integrated into the rotating connection hole 45 of the vortex exciter 4. The permanent magnet array generates a strong static magnetic field, which can be made of neodymium magnets with a magnetic field strength of 0.8 to 1.2 T. This power generation unit enables non-mechanical power generation. First, water flows through the drainage tip 43, generating vortex shedding, which drives the vortex exciter 4 to swing around the rotating axis 35, generating mechanical energy. As the vortex exciter 4 swings, its internal electromagnetic coil and the permanent magnet within the outer buoy 2 undergo relative cutting motion. The coil cuts through the magnetic flux lines, generating a periodic alternating current. This process complies with Faraday's law of electromagnetic induction, and the energy path is: wave kinetic energy → mechanical energy from the swinging of the vortex exciter 4 → coil cutting through the magnetic flux lines → induced electrical energy output. For details of the power generation unit, please refer to the existing patent application number CN104005901B.

[0046] At the same time, the swing of the vortex-exciting oscillator 4 disrupts the formation of the regular vortex street, disperses the water flow energy, and reduces the vibration amplitude of the outer buoy 2. Experiments show that the vibration amplitude of the outer buoy 2 can be reduced by more than 50%.

[0047] It should be understood that in actual applications, the vortex-induced oscillator 4 can also be connected to the outer buoy 2 by mechanical transmission to achieve power generation, such as gear transmission rotation. However, the vortex-induced oscillator 4 in the above preferred embodiment is directly hinged to the outer buoy 2. Compared with the gear transmission of the traditional mechanical transmission power generation structure, the gear transmission chain is eliminated, the corrosion and jamming problems in the marine environment are avoided, and the reliability is improved. At the same time, it helps the vortex-induced oscillator 4 to swing efficiently, and the swing frequency matches the wave vortex shedding frequency (usually 0.5Hz to 2Hz), directly driving the electromagnetic coil and reducing intermediate transmission losses.

[0048] Example 2

[0049] Reference Figures 9 to 11 As shown, Example 2 of the present invention provides another floating wind turbine foundation platform capable of absorbing wave and current energy. The floating wind turbine foundation platform capable of absorbing wave and current energy is innovatively integrated with the oscillating hydrofoil 34 technology based on the three-buoy semi-submersible structure of Example 1, thereby further improving the stability and energy capture efficiency of the platform.

[0050] Specifically, if Figure 9 As shown, the platform adopts a three-buoy semi-submersible structure, including a middle buoy 1 and three outer buoys 2, distributed in an equilateral triangle. The middle buoy 1 is connected to the wind turbine tower, and the outer buoys 2 are fixedly connected to the middle buoy 1 through a connecting beam 6. The connecting beam 6 includes a main support 61, a top transverse support 62, a diagonal support 63, a base 64 and a bottom transverse support 65, forming a stable truss structure. The energy-absorbing bracket 3 is sleeved on the outer periphery of the middle buoy 1 and includes an intermediate sleeve 31, support ribs 32 and an outer sleeve 33. An electromagnetic coil is sealed in the outer sleeve 33, which cooperates with the permanent magnet in the outer buoy 2 to realize energy conversion.

[0051] like Figure 10 As shown, in this embodiment, an oscillating hydrofoil 34 is additionally provided on the support rib 32 of the energy-absorbing bracket 3. The oscillating hydrofoil 34 is rotatably connected to the support rib 32 via a rotating shaft 35. The oscillating hydrofoil 34 adopts a low-speed wing airfoil with a rounded head and a pointed tail. The rounded end of the oscillating hydrofoil is provided with a through-circular cavity and is connected to the rotating shaft 35 via a self-aligning ball bearing to ensure the hydrofoil can swing freely.

[0052] like Figure 11 As shown, a unidirectional array of oscillating hydrofoils 34 is distributed at the bottom of the supporting ribs 32, with the two ends of the rotating shaft 35 connected to the supporting ribs 32. The oscillating hydrofoils 34 are rotatably connected to the rotating shaft 35, and multiple oscillating hydrofoils 34 are arranged at equal intervals. When the energy-absorbing bracket 3 is subjected to the load of wave flow, the oscillating hydrofoils 34 can passively rotate around the rotating shaft 35 to change the floating angle, generating a thrust in the opposite direction of the seawater load, providing additional lift for the energy-absorbing bracket 3, and assisting the electromagnetic induction between the outer sleeve 33 and the outer buoy 2. At the same time, the vortex-induced oscillator 4 on the outer buoy 2 further captures the energy of the water flow through the swing power generation unit. The two work together to provide 20% to 30% of auxiliary power for the platform.

[0053] In this embodiment, the damping effect of the oscillating hydrofoils 34 combined with the kinetic energy absorption of the energy-absorbing bracket 3 significantly reduces platform vibration and improves wind turbine power generation efficiency by over 15%. Furthermore, the restoring force provided by the hydrofoils reduces the design requirements for the mooring system, saving construction costs.

[0054] The floating wind turbine foundation platform capable of absorbing wave and current energy disclosed in an embodiment of the present invention can provide 20% to 30% of auxiliary power to the platform by installing a vortex-induced vibration module. At the same time, the application of hydrofoil vibration reduction technology can not only increase the wind turbine's power generation efficiency by more than 15%, but also reduce the platform's pitch amplitude by 50%, significantly extending the service life of the structure, thereby bringing significant expected results in multiple aspects such as power generation gain, cost reduction, and stability improvement. In addition, this embodiment realizes an integrated solution of "vibration suppression-energy recovery-active regulation" by integrating the oscillating hydrofoil 34 with the energy-absorbing bracket 3. The synergistic effect of the oscillating hydrofoil 34 and the energy-absorbing bracket 3 improves the vibration reduction effect and energy capture efficiency, and the passive control of the hydrofoil does not require additional energy, reducing the complexity of the system. The overall structure of the platform is compact and adaptable to the complex environment of the deep sea, providing reliable technical support for the commercial application of floating wind turbines.

[0055] In the description of the present invention, it should be understood that the terms "longitudinal", "transverse", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0056] The embodiments described above are merely descriptions of preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Without departing from the spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by persons skilled in the art should fall within the scope of protection defined by the claims of the present invention.

Claims

1. A floating wind turbine foundation platform capable of absorbing wave and current energy, characterized in that: The invention comprises a middle buoy (1), a plurality of outer buoys (2) are distributed in a circular array around the middle buoy (1), and the plurality of outer buoys (2) are fixedly connected to the middle buoy (1) through a connecting beam (6); an energy absorbing bracket (3) is movably connected to the middle buoy (1) and the outer buoy (2), and the energy absorbing bracket (3) comprises a middle sleeve (31) sleeved on the middle buoy (1), an outer sleeve (33) sleeved on the outer buoy (2), and a sleeve (34) fixedly connected to the middle sleeve (31) and the outer sleeve (35). The outer sleeve (33) includes a supporting rib (32); an electromagnetic coil is sealed in the outer sleeve (33), a permanent magnet is fixed in the outer buoy (2), and the electromagnetic coil and the permanent magnet cooperate to convert the reciprocating kinetic energy of the energy absorbing bracket (3) into electrical energy; and the energy absorbing bracket (5) is also included, which is sleeved on the outer periphery of the intermediate buoy (1) and located at the bottom of the energy absorbing bracket (3), and the energy absorbing bracket (5) is used to drive the energy absorbing bracket (3) to reciprocate axially along the intermediate buoy (1).

2. The floating wind turbine foundation platform capable of absorbing wave and current energy according to claim 1 is characterized in that: A plurality of flow-disturbing blades (52) are fixedly connected to the outer peripheral surface of the energy-absorbing buoy (5), and the flow-disturbing blades (52) are used to absorb the impact force of seawater and convert it into the rotational force of the energy-absorbing buoy (5).

3. The floating wind turbine foundation platform capable of absorbing wave and current energy according to claim 1, characterized in that: A plurality of oscillating hydrofoils (34) are rotatably connected to the supporting ribs (32) of the energy absorbing bracket (3). The oscillating hydrofoils (34) are rotatably connected to the supporting ribs (32) via a rotating shaft (35). The oscillating hydrofoils (34) adopt a low-speed wing airfoil with a round head and a pointed tail. A through circular cavity is provided at the round head end of the oscillating hydrofoil, which is connected to the rotating shaft (35) via a self-aligning ball bearing.

4. The floating wind turbine foundation platform capable of absorbing wave and current energy according to claim 3 is characterized in that: The oscillating hydrofoils (34) are arranged in a unidirectional array at the bottom of the supporting rib (32), and a plurality of oscillating hydrofoils (34) are arranged at equal distances.

5. The floating wind turbine foundation platform capable of absorbing wave and current energy according to claim 1 is characterized in that: At least one vortex oscillator (4) is rotatably connected to the outside of the outer buoy (2), and a power generation unit is integrated inside the vortex oscillator (4) for converting the swinging mechanical energy of the vortex oscillator (4) into electrical energy.

6. The floating wind turbine foundation platform capable of absorbing wave and current energy according to claim 5, characterized in that: The vortex exciter (4) is designed as a streamlined oscillating body with a water droplet-shaped cross section, comprising a water-facing arc surface (41), a drainage surface (42) and a drainage tip (43), wherein the water-facing arc surface (41) guides the water flow to separate smoothly.

7. The floating wind turbine foundation platform capable of absorbing wave and current energy according to claim 6, characterized in that: The drainage tip (43) is at an acute angle and is used to accelerate the separation of water flow to form periodic alternating vortices, thereby driving the vortex oscillator (4) to oscillate.

8. The floating wind turbine foundation platform capable of absorbing wave and current energy according to claim 5, characterized in that: The power generation unit comprises a permanent magnet array and an electromagnetic coil, and the vortex exciter (4) cooperates with the permanent magnet array and the electromagnetic coil to realize electromagnetic conversion and output electric energy through swinging.

9. The floating wind turbine foundation platform capable of absorbing wave and current energy according to claim 1, characterized in that: The ratio of the number of the intermediate buoys (1) to the number of the outer buoys (2) is 1:

3.

10. The floating wind turbine foundation platform capable of absorbing wave and current energy according to claim 1, characterized in that: The connecting beam (6) includes a main support (61), a top transverse support (62), a diagonal support (63), a base (64) and a bottom transverse support (65), wherein the main support (61) connects two adjacent outer buoys (2), the top transverse support (62) connects the outer buoys (2) and the middle buoy (1), the base (64) is fixed to the bottom of the middle buoy (1), the bottom transverse support (65) connects the outer buoys (2) and the base (64), and the diagonal support (63) connects the main support (61) and the base (64).

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