A fixed monopile wind turbine-oscillating float wave energy device integrated device

Abstract

This invention belongs to the field of integrated development technology of offshore renewable energy, and discloses an integrated device for a fixed monopile wind turbine-oscillating buoy wave energy conversion system. It includes wind turbine equipment, an oscillating buoy wave energy conversion device, a fixed monopile foundation, a control system, and a power transmission system. The fixed monopile foundation comprises a lower wind turbine foundation, a lattice-type structure, and an upper wind turbine foundation connected in sequence; the lattice-type structure is located in the wave action zone. The oscillating buoy wave energy conversion device includes a permanent magnet linear generator, an oscillating buoy, a straight shaft, a concentrating arc plate, a buoy shield chamber, and a buoy draft control mechanism. The concentrating arc plate is arranged on the upper wind turbine foundation, and its up-and-down movement is controlled by the control system. This invention reduces the wave load on the fixed monopile wind turbine equipment under harsh sea conditions, improving the survivability and durability of the integrated equipment; simultaneously, through the oscillating buoy wave energy conversion device, it achieves wave concentration and wave energy extraction, realizing the complementary development of "wind-wave" energy in time and space.

Description

Technical Field

[0001] This invention relates to the field of integrated development technology of offshore renewable energy, and in particular to an integrated device for a fixed monopile wind turbine-oscillating float wave energy device. Background Technology

[0002] In recent years, bottom-fixed offshore wind turbines (BFOWTs) have become an effective device for offshore wind energy development in shallow and medium-water areas due to their advantages such as simple structure, low cost, and good durability. However, the nearshore sites suitable for fixed wind turbines are becoming increasingly limited. To further increase the overall development of marine clean energy, the core lies in researching the integrated development of multiple marine energy sources to achieve large-scale utilization of marine energy.

[0003] To promote the large-scale utilization of ocean energy, and considering that wave energy, as a high-energy-density and highly predictable renewable energy source, is abundant but its independent development costs are too high, it is worth noting that most wind-rich sea areas also contain abundant wave energy resources. This creates conditions for building an integrated "wind-wave" complementary platform. By integrating the Wave Energy Converter (WEC) into the foundation of stationary wind turbines, near-water space can be effectively utilized, energy output can be increased, and the cost of infrastructure sharing can be reduced.

[0004] Among various types of wind turbine (WEC) systems, the oscillating buoy (OB) device is widely considered the best integration choice for stationary wind turbine platforms due to its advantages such as simple structure, high energy extraction efficiency, and high reliability. Its working principle utilizes the reciprocating motion of a buoy driven by waves to convert mechanical energy into electrical energy through a hydraulic or mechanical transmission system. Crucially, the target height for wind energy harvesting from stationary monopile wind turbines typically exceeds 100 meters, indicating that the space near the sea surface is not fully utilized. Furthermore, during periods of low wind speed, wind power generation is insufficient. Therefore, integrating the OB device into the main pile section in the wave zone allows for complementary development of wind and wave energy in both time and space.

[0005] CN216887152U discloses a wave oscillation float generator set based on a monopile wind turbine, which installs an oscillating float wave energy conversion device on an installation platform connected to the support rod of the monopile wind turbine to achieve integrated wind-wave development. However, fixed wind turbine platforms are subjected to considerable wave loads in the wave-affected areas. This dynamic and cyclical action can easily lead to fatigue damage to the sea surface portion of the wind turbine, threatening its service life, especially under sea conditions. The introduction of the oscillating float device disclosed in CN216887152U may exacerbate the load on the wind turbine foundation. Therefore, reducing the wave load on offshore monopile wind turbines to improve their safety and durability is an urgent problem to be solved. Summary of the Invention

[0006] In view of this, the present invention provides a fixed monopile wind turbine-oscillating float wave energy device integrated device to solve the above-mentioned technical problems, enabling the joint development of "wind-wave" in mid- and near-shore waters, realizing the spatiotemporal complementarity of energy, reducing the wave load on offshore monopile wind turbines, and improving their survivability and durability.

[0007] To achieve the above technical objectives, the present invention adopts the following technical solution: a fixed monopile wind turbine-oscillating float wave energy device integrated device, including wind turbine equipment, oscillating float wave energy conversion device, fixed monopile foundation, control system, and power transmission system; The wind turbine is fixed by a fixed monopile foundation, and the oscillating float wave energy conversion device is fixed inside the fixed monopile foundation; the control system and the power transmission system are respectively connected to the oscillating float wave energy conversion device; The fixed monopile foundation comprises a wind turbine lower foundation, a lattice structure, and a wind turbine upper foundation connected in sequence; the lattice structure is located in the wave action zone. The oscillating float wave energy conversion device includes a permanent magnet linear generator, an oscillating float, a straight shaft, an energy-concentrating arc plate, a float protection chamber, and a float draft control mechanism. The permanent magnet linear generator is fixed inside the upper foundation of the wind turbine; one end of the straight shaft is located inside the permanent magnet linear generator, and the other end extends into the lower foundation of the wind turbine; the oscillating float is fixedly sleeved on the outside of the straight shaft, driving the straight shaft to perform a swaying motion; the float protection chamber is the concave part at the top of the lower foundation of the wind turbine, used to fit the oscillating float; The float draft control mechanism is located inside the foundation at the bottom of the wind turbine and is connected to the other end of the straight shaft; The energy-concentrating arc plate is slidably connected to the upper foundation of the wind turbine, and the energy-concentrating arc plate is moved to the lattice structure by the control system.

[0008] The lattice structure includes several supporting connecting columns; one end of each supporting connecting column is connected to the upper foundation of the wind turbine, and the other end is connected to the lower foundation of the wind turbine.

[0009] The outer wall of the upper foundation of the wind turbine is fixed with a concentrating arc plate control track, and the arc plate control gear is located on the surface of the concentrating arc plate control track; the inner side of the concentrating arc plate is gear-shaped; the concentrating arc plate meshes with the arc plate control gear and moves up and down along the concentrating arc plate control track.

[0010] The permanent magnet linear generator is driven by an oscillating float to make a vertical shaft swing, and the coil windings fixed on the upper part of the vertical shaft cut magnetic field lines to generate electricity.

[0011] The wind turbine equipment includes a nacelle installed on top of a fixed monopile foundation, a power generation unit installed inside the nacelle, and multiple wind turbine blades installed at the tip of the nacelle.

[0012] The control system includes a wind speed monitoring sensor fixed to the outer wall of the upper foundation of the wind turbine, a laser wavefront displacement sensor fixed to the outer wall of the upper foundation of the wind turbine, and control equipment.

[0013] The float draft control mechanism includes a steel cable connected to the lower part of the straight shaft, a fixed pulley block, and an independent motor drive device; the motor drive device is connected to the steel cable via the fixed pulley block.

[0014] The present invention achieves the following beneficial effects compared to the prior art: Under operating sea conditions: This invention integrates an oscillating float-type wave energy conversion device into the part of the fixed monopile foundation subjected to wave action to generate wave energy, realizing the complementary utilization of "wind-wave" energy in time and space; This invention sets multiple arc-shaped energy-concentrating plates on the upper part of the fixed monopile foundation, and by lowering two corresponding energy-concentrating arc plates, the maximum wave-concentrating effect is achieved under different wave direction conditions, thereby concentrating energy and improving wave energy conversion efficiency.

[0015] Under sea conditions: This invention employs a lattice structure design in the wave-affected portion of the fixed monopile foundation. When the energy-concentrating arc plate is retracted, most of the wave energy can pass through the foundation, reducing the wave load on the monopile foundation and improving the survivability and durability of the integrated device under extreme sea conditions. This invention also includes a float shelter chamber at the bottom of the fixed monopile foundation. Through a float draft control mechanism, the float is pulled into the float shelter chamber and locked, reducing the wave effect and protecting the overall structure. Attached Figure Description

[0016] Figure 1 This is a three-dimensional perspective view of the integrated device of the fixed monopile wind turbine-oscillating float wave energy device of the present invention; Figure 2 This is a three-dimensional view of the near-sea surface portion of the integrated device for the fixed monopile wind turbine-oscillating float wave energy device of the present invention; Figure 3 This is a sectional view of the central axis of the integrated device of the fixed monopile wind turbine-oscillating float wave energy device of the present invention; Among them: 1-Upper foundation of wind turbine, 2-Energy-concentrating arc plate, 3-Lower foundation of wind turbine, 4-Oscillating float, 5-Wind speed monitoring sensor, 6-Laser wavefront displacement sensor, 7-Straight shaft, 8-Energy-concentrating arc plate control track, 9-Support connecting column, 10-Float shield chamber, 11-Permanent magnet linear generator, 12-Float draft control mechanism, 13-Arc plate control gear. Detailed Implementation

[0017] The purpose of this invention is to provide an integrated device for a fixed monopile wind turbine-oscillating float wave energy system, thereby solving the problems existing in the prior art and enabling the complementary utilization of wind and wave energy in time and space, reducing the wave load on the wind turbine foundation. The invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0018] A fixed monopile wind turbine-oscillating float wave energy conversion device integrated device, comprising: a fixed monopile foundation, an oscillating float wave energy conversion device, wind turbine equipment, a control system, and a power transmission system.

[0019] Preferably, the fixed monopile wind turbine-oscillating buoy wave energy conversion device integrated device is fixedly installed on the seabed. The wind turbine works under the action of sea wind, continuously converting wind energy into electrical energy. At the same time, the oscillating buoy wave energy conversion device also works under the action of waves, continuously converting wave energy into electrical energy. Then, together with the electrical energy generated by the wind turbine, they are collected into the matching power transmission system. In this way, a single system can greatly improve energy utilization efficiency and reduce the cost per kilowatt-hour.

[0020] Preferably, in this invention, the fixed monopile foundation comprises: a lower foundation 3 for the wind turbine installed on the seabed, an upper foundation 1 for the wind turbine supporting the wind turbine equipment, and a plurality of supporting connecting columns 9 connecting the two. With this in mind, the wave-affected portion of the original fixed monopile foundation was redesigned using a lattice structure. Instead of using a single, continuous connection, multiple supporting columns 9 were used to connect the upper foundation 1 and the lower foundation 3 of the wind turbine. This reduced the area of ​​the foundation of the entire fixed monopile wind turbine-oscillating float wave energy device integrated device exposed to waves, allowing waves to effectively pass through the lattice structure and reduce the load on the foundation.

[0021] Preferably, in this invention, the control system includes: a wind speed monitoring sensor 5 fixed to the outer wall of the upper foundation 1 of the wind turbine, a laser wavefront displacement sensor 6 fixed to the outer wall of the upper foundation 1 of the wind turbine, and other necessary signal and control equipment. With this, the control system can use the wind speed monitoring sensor 5 and the laser wavefront displacement sensor 6 to judge the current sea conditions and adjust the corresponding working status of the fixed monopile wind turbine-oscillating float wave energy device integrated device in a timely manner. In addition, by using multiple laser wavefront displacement sensors 6 to judge the wave direction during operation, the corresponding energy-concentrating arc plate 2 can be adjusted in time to obtain higher wave energy conversion efficiency.

[0022] Preferably, in this invention, the oscillating float wave energy conversion device comprises: an energy-concentrating arc plate 2 installed on the upper foundation of the wind turbine, a permanent magnet linear generator 11 installed at the center of the upper foundation of the wind turbine, an oscillating float 4 and a straight shaft 7 connected to the permanent magnet linear generator 11 and capable of heaving motion, a float protection chamber 10 and a float draft control mechanism 12 disposed at the center of the lower foundation of the wind turbine; With this, the oscillating float 4 undergoes a heaving motion under the action of waves, which drives the straight shaft 7, which is rigidly connected to the oscillating float 4, to convert the kinetic energy of motion into electrical energy in the permanent magnet linear generator 11, thus realizing wave energy conversion.

[0023] Preferably, in this invention, the float protection chamber 10 is formed in the center of the lower foundation 3 of the wind turbine, and is designed as an empty chamber to fit the oscillating float 4, thereby protecting the float under sea conditions and reducing the load on the overall mechanism.

[0024] Preferably, in this invention, the energy-concentrating arc plate 2 is formed on the outer wall of the upper foundation 1 of the wind turbine, and can move up and down on the energy-concentrating arc plate control track 8 under the control of the arc plate control gear 13; In particular, due to the existence of the lower lattice design section, the energy-concentrating arc plate 2 relies solely on the arc plate control gear 13 in the corresponding energy-concentrating arc plate control track 8 for position control. The energy-concentrating arc plate 2 moves in a vertical cantilever manner. At any time, such as when it is fully lowered or fully lifted, the energy-concentrating arc plate 2 does not bear any support role. Preferably, the designed energy-concentrating arc-shaped plates consist of four plates, each occupying 90° of the cross-section. The control system can determine the different wave directions under the operating sea conditions and lower the corresponding two arc-shaped energy-concentrating plates to achieve the maximum energy-concentrating effect, forming concentrated waves and improving wave energy conversion efficiency. More preferably, eight or sixteen energy-concentrating arc-shaped plates are provided, with each part being the same size.

[0025] Preferably, in this invention, the float draft control mechanism 12 includes: a steel cable connected to the lower part of the straight shaft 7, a fixed pulley group, and an independent motor transmission device; With this, the control system judges the sea conditions. In the sea conditions of survival, the straight shaft 7 and the oscillating float 4 can be pulled into the float protection chamber 10 and locked by an independent motor drive device through a steel cable to reduce the wave action on the oscillating float 4 and protect the safety of the overall mechanism. In the sea conditions of operation, the steel cable can be released in the opposite direction, and the straight shaft 7 and the oscillating float 4 can be lifted by their own buoyancy and then the operation can be carried out.

[0026] Please see Figures 1-3 ,in Figure 1 This is a three-dimensional perspective view of the integrated device of the fixed monopile wind turbine-oscillating float wave energy device of the present invention; Figure 2 This is a three-dimensional perspective view of the near-sea surface portion of the fixed monopile wind turbine-oscillating float wave energy device integrated device of the present invention; Figure 3 This is a cross-sectional view of the central axis of the integrated device of the fixed monopile wind turbine-oscillating float wave energy device of the present invention.

[0027] The fixed monopile foundation includes the upper foundation 1 of the wind turbine, the lower foundation 3 of the wind turbine, and the supporting connecting column 9; Specifically, the wind turbine's lower foundation 3 is fixed to the seabed, forming a fixed installation foundation. Considering that most monopile foundation structures in shallow sea fixed support platforms adopt tubular structures with small cross-sectional areas, which can ensure overall strength and stability, three supporting connecting columns 9 are set in the wave-affected area or near the sea surface, and the wind turbine's upper foundation 1 is installed on top to form the main integrated device architecture. In particular, the number and specific dimensions of the supporting connecting columns can be adjusted according to the actual situation to ensure strength and stability.

[0028] The control system includes a wind speed monitoring sensor 5 fixed to the outer wall of the upper foundation 1 of the wind turbine, a laser wavefront displacement sensor 6 fixed to the outer wall of the upper foundation 1 of the wind turbine, and other necessary signal and control equipment. Specifically, the wind speed monitoring sensor 5 can collect the current sea wind speed signal and send it to the control equipment; four laser wave surface displacement sensors 6 are fixed on the outer wall of the foundation 1 on the upper part of the wind turbine to collect wave information under the current sea conditions, including wave height, wave direction, etc., and send it to the control equipment. At the same time, the control equipment makes judgments and decisions based on the information collected by the wind speed monitoring sensor 5 and the laser wavefront displacement sensor 6, determines the current sea state, and adjusts other equipment accordingly.

[0029] The oscillating float wave energy conversion device includes an energy-concentrating arc plate 2 installed on the upper foundation 1 of the wind turbine, a permanent magnet linear generator 11 installed at the center of the upper foundation 1 of the wind turbine, an oscillating float 4 and a straight shaft 7 connected to the permanent magnet linear generator 11 and capable of heaving motion, a float protection chamber 10 fixed to the center of the lower foundation 3 of the wind turbine, and a float draft control mechanism 12. Specifically, four energy-concentrating arc-shaped plates 2 are slidably connected to the outer wall of the upper foundation 1 of the wind turbine. They can be controlled by the control system and move up and down on the energy-concentrating arc-shaped plate control track 8 through the vertical array of arc-shaped plate control gears 13. In one implementation scheme, as shown in the appendix Figure 3 As shown, the arc plate control gears 13 are arranged vertically along the energy-concentrating arc plate control track 8. Each arc plate control gear 13 meshes with the inner side of the energy-concentrating arc plate 2 and is controlled by a motor. Under working sea conditions, for a certain energy-concentrating arc plate 2, the set of arc plate control gears 13 corresponding to its energy-concentrating arc plate control track 8 is driven to rotate by the motor. The energy-concentrating arc plate 2 meshing with this set of arc plate control gears 13 can be lowered along the energy-concentrating arc plate control track 8 and stop after reaching the predetermined position. Under survival sea conditions, this set of arc plate control gears 13 is controlled to rotate in the opposite direction, and the energy-concentrating arc plate 2 is lifted along the energy-concentrating arc plate control track 8 and stops after reaching the predetermined position.

[0030] In the above implementation scheme, the energy-concentrating arc plate 2 moves up and down in a vertical cantilever manner and does not provide any support to the structure; when the waves are small and it is necessary to reflect energy to improve efficiency, the energy-concentrating arc plate 2 is lowered; when the waves are large and may cause structural safety problems, the energy-concentrating arc plate 2 is raised.

[0031] In particular, the strength and stability of the energy-concentrating arc plate 2 during movement are determined by the unsuspended portion of the energy-concentrating arc plate 2. In the implementation plan, especially when the energy-concentrating arc plate 2 is fully lowered, the energy-concentrating arc plate 2 is designed with a sufficient unsuspended portion at the upper foundation 1 of the wind turbine to ensure the safety and stability of the structure. At the same time, the energy-concentrating arc plate control track 8, which is fixed to the outside of the upper foundation 1 of the wind turbine, is designed with a sufficient length to ensure the range of movement of the energy-concentrating arc plate 2.

[0032] In particular, under operating sea conditions, the control system can control the two energy-concentrating arc plates 2 to be lowered to completely shield the lattice design section formed by the supporting connecting column 9, thereby reflecting waves, increasing the wave action on the oscillating float 4, and improving wave energy conversion efficiency. In particular, under operating sea conditions, the control system determines the current wave direction based on the information collected by the laser wavefront displacement sensor 6, and controls the corresponding two energy-concentrating arc plates 2 to be lowered, thereby improving the wave energy conversion efficiency under different wave directions. Specifically, the permanent magnet linear generator 11 is fixed to the center of the upper foundation 1 of the wind turbine. It has a stator core, multiple annular slots, coil windings, a straight shaft 7, and permanent magnet poles. The main mechanism is that the oscillating float 4 drives the straight shaft 7, which is rigidly connected to it, under the action of waves. This causes the permanent magnet poles on the straight shaft 7 to sway, so that the coil windings cut the magnetic field lines to generate current, thereby converting the mechanical energy of the float's motion into electrical energy. Specifically, the float draft control mechanism 12 has a steel cable connected to the lower part of the straight shaft 7, a fixed pulley block and an independent motor drive device; Specifically, in sea conditions where survival is possible, an independent motor drive will tighten the steel cable, causing the straight shaft 7 and the oscillating float 4 to overcome their buoyancy, descend to the float protection chamber 10 and lock in place, thus protecting the entire mechanism. Specifically, under operating sea conditions, the independent motor drive will operate to loosen the steel cable, allowing the straight shaft 7 and the oscillating float 4 to float up again due to their buoyancy, giving them sufficient range of motion to carry out wave energy conversion operations; Specifically, the float protection chamber 10 is located on the top center of the foundation 3 of the wind turbine. Under survivable sea conditions, the oscillating float 4 can be completely embedded, thus protecting the overall structure and reducing the overall load.

[0033] For any of the above-mentioned parts involving electrical signal control, corrosion prevention, or other stringent requirements, strict sealing methods must be employed to protect the safety and durability of the overall integrated device.

[0034] Unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art will understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0035] The above description is merely a preferred embodiment of the present invention. The description of the above embodiments is only for the purpose of helping to understand the method and core idea of ​​the present invention, and is not intended to limit the technical scope of the present invention in any way. Therefore, any minor modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention shall still fall within the scope of the technical solution of the present invention.

Claims

1. A fixed monopile wind turbine-oscillating float wave energy device integrated device, characterized in that, This includes wind turbine equipment, oscillating float wave energy conversion device, fixed monopile foundation, control system, and power transmission system; The wind turbine is fixed by a fixed monopile foundation, and the oscillating float wave energy conversion device is fixed inside the fixed monopile foundation; the control system and the power transmission system are respectively connected to the oscillating float wave energy conversion device; The fixed monopile foundation includes a wind turbine lower foundation (3), a lattice structure, and a wind turbine upper foundation (1) connected in sequence. The lattice structure is located in the wave action zone. The oscillating float wave energy conversion device includes a permanent magnet linear generator (11), an oscillating float (4), a straight shaft (7), an energy-concentrating arc plate (2), a float protection chamber (10), and a float draft control mechanism (12). The permanent magnet linear generator (11) is fixed inside the upper foundation (1) of the wind turbine; one end of the straight shaft (7) is located inside the permanent magnet linear generator (11), and the other end extends into the lower foundation (3) of the wind turbine; the oscillating float (4) is fixedly sleeved on the outside of the straight shaft (7) and drives the straight shaft (7) to make a swaying motion; the float protection chamber (10) is the concave part of the top of the lower foundation (3) of the wind turbine, used to fit the oscillating float (4); The float draft control mechanism (12) is located inside the foundation (3) of the lower part of the fan and is connected to the other end of the straight shaft (7); The energy-concentrating arc plate (2) is slidably connected to the upper foundation (1) of the wind turbine, and the energy-concentrating arc plate (2) is moved to the lattice structure by the control system.

2. The integrated device for a fixed monopile wind turbine-oscillating float wave energy device according to claim 1, characterized in that, The lattice structure includes several supporting connecting columns (9); one end of the supporting connecting column (9) is connected to the upper foundation (1) of the wind turbine, and the other end is connected to the lower foundation (3) of the wind turbine.

3. The integrated device for a fixed monopile wind turbine-oscillating float wave energy device according to claim 1, characterized in that, The outer wall of the upper foundation (1) of the wind turbine is fixed with a concentrating arc plate control track (8), and the arc plate control gear (13) is located on the surface of the concentrating arc plate control track (8); the inner side of the concentrating arc plate (2) is gear-shaped; the concentrating arc plate (2) meshes with the arc plate control gear (13) and moves up and down along the concentrating arc plate control track (8).

4. The integrated device for a fixed monopile wind turbine-oscillating float wave energy device according to claim 1, characterized in that, The permanent magnet linear generator (11) is driven by the oscillating float (4) to perform a swaying motion on the connected straight shaft (7). The coil winding fixed on the upper part of the straight shaft (7) cuts the magnetic field lines to generate electricity.

5. The integrated device for a fixed monopile wind turbine-oscillating float wave energy device according to claim 1, characterized in that, The wind turbine equipment includes a nacelle installed on top of a fixed monopile foundation, a power generation unit installed inside the nacelle, and multiple wind turbine blades installed at the tip of the nacelle.

6. The integrated device for a fixed monopile wind turbine-oscillating float wave energy device according to claim 1, characterized in that, The control system includes a wind speed monitoring sensor (5) fixed to the outer wall of the upper foundation (1) of the wind turbine, a laser wavefront displacement sensor (6) fixed to the outer wall of the upper foundation (1) of the wind turbine, and control equipment.

7. The integrated device for a fixed monopile wind turbine-oscillating float wave energy device according to claim 1, characterized in that, The float draft control mechanism (12) includes a steel cable connected to the lower part of the straight shaft (7), a fixed pulley group and an independent motor drive device; the motor drive device is connected to the steel cable through the fixed pulley group.

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