Wind-wave-fish high-stability integrated system

Abstract

The invention discloses a wind-wave-fish high-stability integrated system which comprises a floating fan platform, a heaving type wave energy power generation device and an ocean fishing net. The heaving type wave energy power generation device is installed in the center of a buoy of the floating type draught fan platform, captures energy through the vertical oscillation motion of the floating type draught fan platform under the action of waves and converts the energy into electric energy. And the ocean fishing net is fixed on the floating fan platform base. According to the floating fan platform, deep and far sea aquaculture can be achieved, and meanwhile the floating fan platform is further subjected to oscillation reduction and stabilization.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of deep-sea renewable energy development, in particular to a wind-wave-fish high-stability integrated system. BACKGROUND

[0002] Current deep-sea resource development faces many technical bottlenecks. Although floating wind turbines have achieved commercial application, the multi-degree-of-freedom motion response of the platform under the combined action of wind and waves is significantly increased, resulting in reduced power generation efficiency. Traditional control strategies mainly focus on suppressing heave motion, and have limited effect on roll and pitch motion control. In severe sea conditions, structural vibration caused by second-order wave forces can exacerbate blade aerodynamic load fluctuations, reducing equipment life and increasing failure rates. Wave energy devices have inherent defects. Oscillating body structures are prone to resonance in extreme sea conditions, and their weak adaptive adjustment capability results in insufficient survival ability. Moreover, existing energy recovery systems are mostly one-way absorption mode, with actual conversion efficiency less than 30% of the theoretical value. Deep-sea aquaculture equipment also faces challenges. Traditional net cages have poor wind and wave resistance and are prone to deformation and damage under wave impact. Their energy supply and operation and maintenance are highly dependent on shore-based support, and the cost of offshore maintenance accounts for more than 20% of the total life cycle cost. The limited operating window period caused by severe sea conditions further restricts the scale of application.

[0003] Existing integrated technologies cannot overcome the systematic synergy barriers: wind-wave integrated systems mainly focus on single-degree-of-freedom optimization (such as heave suppression), and have little effect on roll and pitch stability improvement. Wind-fish or wave-fish combination schemes do not solve the problem of load synergy dispersion and energy mutual aid. For example, fish boat stability control only adjusts roll and ignores heave, and the conflict between net cage layout and wind turbine array has not been effectively coordinated. More importantly, repeated construction of independent systems leads to a cost ratio of dynamic cable and mooring infrastructure of more than 70%, and the sharing of operation and maintenance resources forms a superposition effect. Although the "offshore wind power + marine ranching" mode has been proposed, the lack of standardization of modular construction and intelligent control technology in actual application further hinders the scale of popularization.

[0004] Therefore, single-system optimization cannot achieve efficient mutual aid of wind turbine motion energy and wave energy, cannot build a load synergy mechanism between aquaculture equipment and wind and wave facilities, and cannot form a closed-loop sharing of operation and maintenance resources and energy supply. It is urgent to develop a wind-wave-fish multi-energy complementary high-stability integrated system to solve the system-level coupling defects through cross-disciplinary collaborative design. SUMMARY

[0005] Therefore, the present application provides a wind-wave-fish high-stability integrated system, which can achieve deep-sea aquaculture while further reducing the heave and roll of the floating wind turbine platform.

[0006] The technical scheme adopted by the present application is as follows: A wind-wave-fish high stability integrated system, comprising a floating wind turbine platform, a heaving wave energy power generation device and a marine fishing net; The heaving wave energy power generation device is installed at the center of the floating cylinder of the floating wind turbine platform, and the heaving wave energy power generation device captures energy by vertical oscillation movement of the floating wind turbine platform under the action of waves and converts the energy into electric energy; and the marine fishing net is fixed on the base of the floating wind turbine platform.

[0007] Further, the marine fishing net is divided into upper and lower layers, and the lower layer fishing net can be expanded or contracted under the driving of the driving mechanism according to the wave period T, and the optimal depth of the marine fishing net expansion z opt As follows:

[0008]

[0009]

[0010]

[0011] Wherein, z opt is the optimal depth of the fishing net expansion, is the wave length, ω is the wave angular frequency, ω n is the system natural frequency, is the system damping ratio, K eq is the equivalent stiffness of the fishing net, m eq is the equivalent mass of the fishing net, K 1 is the wave attenuation coefficient, 0.2-0.5, K 2 is the mass-damping compensation coefficient, 0.2, Г(C d ,C m ) is the shape enhancement factor, obtained according to CFD simulation, C d is the drag coefficient, C m is the added mass coefficient, C d0 , C m0 is the shape enhancement factor reference value; the weight coefficient K 3 = 0.7, K 4 = 0.3; the length of the upper layer fishing net is not greater than z opt the lower limit value.

[0012] Further, when the fishing net is a three-prism fishing net,C d = 1.8, C m = 2.0; When the fishing net is cylindrical, C d = 1.0, C m = 1.0.

[0013] Furthermore, the marine fishing net is made of copper mesh.

[0014] Furthermore, the marine fishing net is a synthetic fiber fishing net with an elliptical cross-section and a major axis to minor axis ratio of 4:1.

[0015] Furthermore, the floating wind turbine platform includes blades, a hub, a central column, a triangular semi-submersible platform, pontoons, a base, and a connecting cylinder; the blades are fixed to the central column via the hub, the central column is installed on the triangular semi-submersible platform, the pontoons inside the triangular semi-submersible platform are connected by horizontal and diagonal braces, and each pontoon is equipped with a base below it; each pontoon has a mooring point on its side, which is connected to an anchor chain and an anchor block respectively.

[0016] Furthermore, the marine fishing net is a triangular prism-shaped fishing net, with both the upper and lower layers of the net consisting of three rectangular mesh panels, and the top of the upper layer net being closed by a triangular mesh panel; the driving mechanism includes a servo motor, a ball screw, a nut, a linear guide rail, and a slider; The upper fishing net panel is equipped with a linear guide rail. The slider slides along the linear guide rail and is fixedly connected to the upper part of the lower fishing net. The servo motor drives the ball screw to rotate, which in turn moves the nut fixed on the slider.

[0017] Beneficial effects: 1. The present invention installs marine fishing nets below the floating wind turbine platform. While conducting deep-sea marine aquaculture, it can extend the inherent period of the deep-water floating platform, thereby reducing the effect of waves on the floating wind turbine platform, further reducing swaying and rolling, and improving the stability of the floating platform in all degrees of freedom.

[0018] 2. The lower layer of the fishing net of the present invention can be expanded or contracted according to the wave period T under the drive mechanism, thereby optimizing the interaction between the net and the water flow and reducing the deformation of the fishing net caused by eddies.

[0019] 3. The marine fishing net of this invention uses copper mesh. Copper ions have a natural biocidal effect, which can effectively inhibit the attachment and growth of marine organisms such as algae, barnacles, and shellfish (such as oysters and mussels) on the net, keeping the net clean. Moreover, the high density of the copper mesh means that, for the same volume, the copper mesh can provide greater mass, which helps to resist the rapid swaying of the platform with the waves. The high density can provide a greater added mass effect and hydrodynamic damping (through viscosity effect and vortex shedding), and more effectively dissipate the energy of heave motion. At the same time, the use of copper mesh has higher strength and corrosion resistance.

[0020] 4. The netting of this invention adopts an elliptical cross-section with a major axis to minor axis ratio of 4:1, which can significantly reduce pressure drag (shape drag) and significantly reduce the total thrust of water flow on the fishing net and platform. At the same time, the streamlined design delays boundary layer separation, narrows the frequency range of vortex shedding and weakens the intensity, which can reduce the vibration amplitude by more than 90%, greatly extend fatigue life, and suppress vortex-induced vibration.

[0021] 5. The integrated system of this invention combines three elements into one, enabling the sharing of infrastructure such as power grids and mooring, which can effectively reduce costs and also share operation and maintenance, thereby achieving the goal of increasing efficiency while reducing costs. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0023] Figure 2 This is a front view of the floating wind turbine platform of the present invention.

[0024] Figure 3 This is a schematic diagram of the helical wave energy device of the present invention.

[0025] Figure 4 This is a schematic diagram of the upper marine rubber fishing net of the present invention.

[0026] Figure 5 This is a schematic diagram of the linear guide rail and slider structure of the present invention.

[0027] Among them, 1-floating wind turbine platform; 1-1-blade; 1-2-buoy; 1-3-platform base; 2-heavy wave energy device; 2-1-shell; 2-2-spring; 2-3-limiter; 2-4-counterweight; 2-5-stator; 2-6-mover; 2-7-sliding rod; 3-ocean fishing net; 3-1-net plate; 3-2-screw hole; 4-linear guide rail; 5-slider. Detailed Implementation

[0028] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0029] This invention provides a highly stable integrated system for wind, waves, and fishing, such as... Figure 1As shown, it includes a floating wind turbine platform 1, a helical wave energy power generation device, and a marine fishing net 3.

[0030] A helical wave energy generator is installed at the center of the buoys 1-2 of the floating wind turbine platform 1. This generator captures energy by utilizing the vertical oscillating motion of the floating wind turbine platform 1 under the influence of waves and converts it into electrical energy. A marine fishing net 3 is fixed to the base of the floating wind turbine platform 1. Installing the marine fishing net 3 below the floating wind turbine platform 1 further increases wave resistance, thereby achieving wave resistance and roll reduction for the floating wind turbine platform 1.

[0031] Specifically, such as Figure 2 As shown, the floating wind turbine platform 1 includes blades 1-1, a hub, a central column, a triangular semi-submersible platform, pontoons 1-2, a base, and a connecting cylinder; the blades 1-1 are fixed to the central column via the hub, the central column is installed on the triangular semi-submersible platform, the pontoons 1-2 inside the triangular semi-submersible platform are connected by horizontal and diagonal braces, and each pontoon 1-2 is equipped with a base below it; each pontoon 1-2 has a mooring point on its side, which is connected to an anchor chain and an anchor block respectively.

[0032] like Figure 3 As shown, the heave-type wave energy device 2 includes a shell 2-1, limiters 2-3, springs 2-2, counterweights 2-4, sliding rods 2-7, magnets, a mover 2-6, and a stator 2-5. The top of the counterweight 2-4 is connected to the interior of the shell 2-1 via the spring 2-2. Limiters 2-3 are installed at both ends of the sliding rod 2-7, and the counterweight 2-4 is mounted on the sliding rod 2-7. A coil is wound around the mover 2-6, and the damping of the mover 2-6 can be changed by altering the coil current. The system consisting of the mover 2-6 and the stator 2-5 can simulate a PTO (Power Toll Collection) system. Installing the heave-type wave energy device 2 inside the wind turbine platform float 1-2 reduces the platform's heave motion while achieving combined wind and wave power generation, thus improving the overall power generation efficiency of the system.

[0033] The heave-type wave energy device 2 captures energy by moving up and down with the waves through the floating wind turbine platform 1. The floating wind turbine platform 1 generates heave motion under the excitation force of the waves, and the PTO system converts this motion into usable electrical energy. That is, the counterweight 2-4 carries the mover 2-6 and the magnet located on the mover 2-6 to make heave motion on the sliding rod 2-7, and the stator 2-5 continuously cuts the magnetic field lines to generate electrical energy.

[0034] As an improvement, the marine fishing net 3 is a double-layered net, consisting of upper and lower layers. The upper layer is fixed to the platform base 1-3 via screw holes 3-2. The lower layer can be extended or retracted according to the wave cycle T under the drive mechanism. The optimal extension depth of the marine fishing net 3 is determined by the specific design of the net. z opt (The total length of the upper and lower layers of fishing nets, with the length of the upper layer not exceeding)z opt The lower limit values ​​are as follows:

[0035]

[0036]

[0037]

[0038] in, z opt This is the optimal depth for deploying the fishing net. It is the wave wavelength. ω The wave angular frequency, ω n The system's inherent frequency, For the system damping ratio, K eq The equivalent stiffness of the fishing net. m eq For the equivalent mass of the fishing net, K 1 represents the wave attenuation coefficient, ranging from 0.2 to 0.5. K 2 represents the mass-damping compensation coefficient, taken as 0.2. Г(C d ,C m ) C is the shape enhancement factor, obtained from CFD simulation. d C is the drag coefficient. m As an additional quality coefficient, C d0 C m0 The baseline value for the shape enhancement factor; weighting coefficients. K 3 = 0.7, K 4 = 0.3.

[0039] When the fishing net is a triangular prism shape C d = 1.8, C m = 2.0; When the fishing net is cylindrical, C d = 1.0, C m = 1.0. When the fishing net is a spherical net, C d = 0.5, C m= 0.5. Of course, this solution will not use spherical fishing nets, but the shape enhancement factors corresponding to the above three fishing net shapes can be used as a reference to set the shape enhancement factors of other fishing net shapes.

[0040] In this embodiment, as Figure 4 As shown, the marine fishing net 3 is a triangular prism-shaped fishing net. Both the upper and lower layers of the fishing net are composed of three rectangular mesh panels 3-1, with the top of the upper layer closed by a triangular mesh panel. The driving mechanism includes a servo motor, a ball screw, a nut, a linear guide rail 4, and a slider 5. Linear guide rails 4 are provided on the frame of the upper layer mesh panel 3-1 (either inside or outside the frame), such as... Figure 5 As shown, the slider 5 slides along the linear guide rail 4 and is fixedly connected to the upper end of the lower fishing net. The servo motor drives the ball screw to rotate, which in turn moves the nut fixed on the slider 5, thereby causing the lower fishing net to expand or contract.

[0041] In other embodiments, the upper or lower fishing net may also be an integral structure.

[0042] Marine fishing nets 3 can be made of copper mesh. Biofouling significantly increases the weight of the net, water flow resistance (hydrodynamic load), and alters its hydrodynamic characteristics (such as damping coefficient). Copper ions have a natural biocidal effect, effectively inhibiting the attachment and growth of marine organisms such as algae, barnacles, and shellfish (such as oysters and mussels) on the net, maintaining the cleanliness of the net. Moreover, copper mesh has a higher density, which means that for the same volume, copper mesh can provide greater mass, helping to resist the rapid swaying of the platform with waves. High density can provide a greater added mass effect and hydrodynamic damping (through viscosity effect and vortex shedding), more effectively dissipating the energy of heave motion. At the same time, using copper mesh means higher strength and corrosion resistance.

[0043] In other embodiments, the marine fishing net 3 is a synthetic fiber fishing net with an elliptical cross-section and a major-to-minor axis ratio of 4:1. This significantly reduces pressure drag (form drag) and substantially reduces the total thrust of the water flow on the fishing net and platform. Simultaneously, the streamlined design delays boundary layer separation, narrowing the vortex shedding frequency range and weakening its intensity, reducing vibration amplitude by over 90%, greatly extending fatigue life, and suppressing vortex-induced vibration.

[0044] The working principle of this invention is as follows: When wind and waves impact the integrated system, the wind drives the blades 1-1 to rotate around the hub, thereby converting wind energy into kinetic energy. Simultaneously, the heave-type wave energy device 2 inside the float 1-2, under the action of wave undulations, causes the counterweight 2-4 to move the mover 2-6 up and down on the sliding rod 2-7, and the stator 2-5 cuts magnetic field lines to generate electrical energy. Under the action of waves, the floating platform will generate huge heave and pitching motions. The current of the coil wound on the mover 2-6 can be preset according to the actual sea conditions, thereby adjusting the damping magnitude of the PTO system composed of the mover 2-6 and the stator 2-5, generating a counterforce to suppress the heave motion of the platform. At the same time, the marine fishing net 3 can further increase the wave resistance below the platform base 1-3 of the floating wind turbine platform 1, adding a viscous damper to the platform, increasing the stability of the platform in various degrees of freedom, and realizing the platform's anti-wave and anti-rolling properties.

[0045] In summary, the above are merely preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A high-stability integrated system for wind, waves, and fishing, characterized in that, This includes floating wind turbine platforms, helical wave energy power generation devices, and marine fishing nets; The helical wave energy generation device is installed at the center of the pontoon of the floating wind turbine platform. The helical wave energy generation device captures energy by utilizing the vertical oscillation motion of the floating wind turbine platform under the action of waves and converts it into electrical energy; the marine fishing net is fixed to the base of the floating wind turbine platform.

2. The wind-wave-fishing high-stability integrated system as described in claim 1, characterized in that, The marine fishing net consists of upper and lower layers. The lower layer can be deployed or retracted according to the wave period T under the drive mechanism. The optimal depth for deployment of the marine fishing net is determined by the wave period T. z opt as follows: in, z opt This is the optimal depth for deploying the fishing net. It is the wave wavelength. ω The wave angular frequency, ω n The system's inherent frequency, For the system damping ratio, K eq The equivalent stiffness of the fishing net. m eq For the equivalent mass of the fishing net, K 1 represents the wave attenuation coefficient, ranging from 0.2 to 0.

5. K 2 represents the mass-damping compensation coefficient, taken as 0.

2. Г(C d ,C m ) C is the shape enhancement factor, obtained from CFD simulation. d C is the drag coefficient. m As an additional quality coefficient, C d0 C m0 The baseline value for the shape enhancement factor; weighting coefficients. K 3 = 0.7, K 4 = 0.3; the length of the upper fishing net should not exceed z opt The lower limit value.

3. The wind-wave-fishing high-stability integrated system as described in claim 2, characterized in that, When the fishing net is a triangular prism shape C d = 1.8, C m = 2.0; When the fishing net is cylindrical, C d = 1.0, C m = 1.

0.

4. The wind-wave-fishing high-stability integrated system as described in claim 1, characterized in that, The marine fishing nets are made of copper mesh.

5. The wind-wave-fishing high-stability integrated system as described in claim 1, characterized in that, The marine fishing net is a synthetic fiber fishing net with an elliptical cross-section and a major axis to minor axis ratio of 4:

1.

6. The wind-wave-fishing high-stability integrated system as described in any one of claims 2-5, characterized in that, The floating wind turbine platform includes blades, a hub, a central column, a triangular semi-submersible platform, pontoons, a base, and a connecting cylinder. The blades are fixed to the central column via the hub, and the central column is installed on the triangular semi-submersible platform. The pontoons inside the triangular semi-submersible platform are connected by horizontal and diagonal braces, and each pontoon is equipped with a base. Each pontoon has a mooring point on its side, which is connected to an anchor chain and an anchor block.

7. The wind-wave-fishing high-stability integrated system as described in claim 6, characterized in that, The marine fishing net is a triangular prism-shaped fishing net, with both the upper and lower layers consisting of three rectangular mesh panels, and the top of the upper layer being closed by a triangular mesh panel; the driving mechanism includes a servo motor, a ball screw, a nut, a linear guide rail, and a slider; The upper fishing net panel is equipped with a linear guide rail. The slider slides along the linear guide rail and is fixedly connected to the upper part of the lower fishing net. The servo motor drives the ball screw to rotate, which in turn moves the nut fixed on the slider.

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