A composite offshore floating solar photovoltaic device

Abstract

The present application relates to offshore photovoltaic power generation technology field, especially relates to a kind of compound offshore floating solar photovoltaic equipment.The equipment includes multiple floating photovoltaic modules, every two adjacent floating photovoltaic modules are connected by cable, constitute array module, to improve the stability of photovoltaic equipment, the floating photovoltaic module outside array module is equipped with anchor chain, and is connected by anchor chain and pile foundation type anchor block, to realize buffer type mooring, floating photovoltaic module includes main frame and photovoltaic assembly, photovoltaic assembly is arranged above main frame, main frame bottom is provided with float, to realize array module floating on sea, the height of main frame is greater than preset height, to realize that photovoltaic assembly front surface absorbs the light energy directly irradiated to it and back surface absorbs the light energy reflected to it by sea surface, to improve power generation efficiency.Therefore, the above technical scheme can improve the structural stability of photovoltaic equipment and power generation efficiency.

Description

TECHNICAL FIELD

[0001] The present application relates to the offshore photovoltaic power generation technical field, and particularly relates to a composite offshore floating solar photovoltaic device. BACKGROUND

[0002] The existing domestic floating solar photovoltaic power generation device mainly faces lakes, reservoirs and other environments with small wind and wave conditions, and these structures are not suitable for offshore photovoltaic power generation. The existing photovoltaic power generation platform has poor wind and wave resistance and is easy to be damaged. Moreover, the overall height of the existing photovoltaic power generation platform is low, and the photovoltaic power generation components are easy to be attached with marine organisms or appear salinization, which affects the power generation efficiency and the service life of the photovoltaic power generation components.

[0003] Therefore, there is an urgent need for a composite offshore floating solar photovoltaic device to solve the problem of how to improve the structural stability and power generation efficiency of the photovoltaic device. SUMMARY

[0004] The present application provides a composite offshore floating solar photovoltaic device, which can improve the structural stability and power generation efficiency of the photovoltaic device.

[0005] The present application provides a composite offshore floating solar photovoltaic device, which can improve the structural stability and power generation efficiency of the photovoltaic device.

[0006] A plurality of floating photovoltaic modules, each two adjacent floating photovoltaic modules are connected by a cable to form an array module, and the floating photovoltaic module on the outer side of the array module is provided with an anchor chain and connected to a pile foundation anchor block through the anchor chain to realize buffer mooring.

[0007] The floating photovoltaic module includes a main frame and a photovoltaic component, the photovoltaic component is arranged above the main frame, the bottom of the main frame is provided with a float to realize floating of the array module on the sea, and the height of the main frame is greater than a preset height to realize that the photovoltaic component absorbs light energy directly irradiated thereon from the front surface and light energy reflected thereon from the back surface, and then generates electricity.

[0008] The preset height is determined according to the deck wave phenomenon of the floating photovoltaic module.

[0009] From the above scheme, the composite offshore floating solar photovoltaic device provided by the application comprises a plurality of floating photovoltaic modules, every two adjacent floating photovoltaic modules are connected through a cable belt to form an array module, so as to improve the stability of the photovoltaic device, the floating photovoltaic module on the outer side of the array module is provided with an anchor chain and is connected through the anchor chain and a pile foundation type anchor block to realize buffer type mooring, the floating photovoltaic module comprises a main frame and a photovoltaic assembly, the photovoltaic assembly is arranged above the main frame, the bottom of the main frame is provided with a float to realize floating of the array module on the sea, and the height of the main frame is greater than a preset height, so that the photovoltaic assembly absorbs light energy directly irradiated thereon from the front surface and light energy reflected thereon from the sea surface from the back surface, thereby improving the power generation efficiency. The height of the sea wave is determined by the deck wave phenomenon of the floating photovoltaic module, the height of the main frame is set to be greater than the preset height (namely the height of the simulated sea wave), so that the photovoltaic assembly is prevented from being eroded by seawater, the service life of the photovoltaic power generation assembly is prolonged, and the structural stability of the photovoltaic device is improved. Therefore, the above technical scheme can improve the structural stability and the power generation efficiency of the photovoltaic device. BRIEF DESCRIPTION OF DRAWINGS

[0010] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor based on these drawings.

[0011] Figure 1 A composite offshore floating solar photovoltaic device is provided for the embodiments of the present application.

[0012] Figure 2 A floating photovoltaic module structure schematic diagram in the specific embodiment of the present application;

[0013] Figure 3 A single platform frame structure plan view in the specific embodiment of the present application;

[0014] Figure 4 A single platform frame structure front view in the specific embodiment of the present application;

[0015] Figure 5 A single platform frame structure lower view in the specific embodiment of the present application.

[0016] Reference signs:

[0017] In the figure: 1, floating photovoltaic module; 2, cable belt; 3, main frame; 4, photovoltaic assembly; 5, float; 6, ballast tank; 7, inclined strut beam; 8, maintenance corridor; 9, maintenance stairway; 10, internal inclined strut beam; 11, upper frame; 12, fairlead. DETAILED DESCRIPTION

[0018] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present application with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are some but not all of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative effort belong to the scope of the present application.

[0019] Referring to Figure 1 The embodiments of the present application provide a composite offshore floating solar photovoltaic device, which comprises a plurality of floating photovoltaic modules 1, every two adjacent floating photovoltaic modules 1 are connected by a cable 2 to form an array module, and the floating photovoltaic module on the outer side of the array module is provided with an anchor chain and is connected by the anchor chain and a pile foundation type anchor block to realize buffer type mooring.

[0020] The floating photovoltaic module 1 comprises a main frame 3 and a photovoltaic assembly 4, the photovoltaic assembly 4 is arranged above the main frame 3, the bottom of the main frame 3 is provided with a float to realize floating of the array module on the sea, and the height of the main frame 3 is greater than a preset height to realize that the photovoltaic assembly 4 absorbs light energy directly irradiated thereon in the front and reflects light energy from the sea in the back, and then generates electricity.

[0021] The preset height is determined according to the deck wave phenomenon of the floating photovoltaic module.

[0022] In the embodiments, the device comprises a plurality of floating photovoltaic modules, every two adjacent floating photovoltaic modules are connected by a cable to form an array module to improve the stability of the photovoltaic device, the floating photovoltaic module on the outer side of the array module is provided with an anchor chain and is connected by the anchor chain and a pile foundation type anchor block to realize buffer type mooring, the floating photovoltaic module comprises a main frame and a photovoltaic assembly, the photovoltaic assembly is arranged above the main frame, the bottom of the main frame is provided with a float to realize floating of the array module on the sea, and the height of the main frame is greater than a preset height to realize that the photovoltaic assembly absorbs light energy directly irradiated thereon in the front and reflects light energy from the sea in the back to improve the power generation efficiency. The height of the sea wave is determined according to the deck wave phenomenon of the floating photovoltaic module, the height of the main frame is set to be greater than the preset height (i.e. the height of the simulated sea wave), so that the photovoltaic assembly is free from seawater erosion and the structural stability of the photovoltaic device is improved. Therefore, the above technical solution can improve the structural stability of the photovoltaic device and the power generation efficiency.

[0023] It should be noted that the buffer mooring system mainly reduces the impact force generated by the movement of the floating photovoltaic module by setting buffer elements between the floating photovoltaic modules. These buffer elements usually have elastic or damping properties. For example, a common rubber buffer, when the floating photovoltaic module is displaced by external forces such as wind and waves, the rubber buffer will elastically deform, absorbing and storing part of the energy. Just like the shock absorber of a car, it slows down the vibration and impact force by compression and rebound. The floating photovoltaic module will produce complex motion under the action of environmental loads such as waves, currents, etc., including roll, pitch, heave, etc. The buffer mooring system can convert the kinetic energy of the floating photovoltaic module movement into elastic potential energy of the buffer element or other forms of energy such as heat energy through damping effect for dissipation.

[0024] In some embodiments, the main body of the main body frame 3 is made of PET material, and the outer side of the main body frame 3 is provided with a diagonal bracing beam 7

[0025] In this embodiment, the main body of the main body frame is made of PET material, which has good strength and toughness. Diagonal bracing beams are provided on the outer side of the main body frame, which are inclined and connected to the outer side edge of the main body frame at one end and connected to the ground or other supports at the other end. The setting of the diagonal bracing beam provides additional support for the main body frame, which helps to enhance the stability of the main body frame and makes the main body frame maintain a good structural state when subjected to external forces. It can effectively disperse the pressure borne by the main body frame and improve the carrying capacity of the main body frame. At the same time, the design of the diagonal bracing beam also increases the overall stiffness of the main body frame and reduces the deformation of the main body frame under stress.

[0026] As shown in Figure 3 and Figure 5 In some embodiments, a plurality of transverse support beams and a plurality of longitudinal support beams are arranged in the upper frame 11, and the transverse support beams and the longitudinal support beams are arranged in a grid shape; the photovoltaic module 4 is fixed on the transverse support beams and the longitudinal support beams by the connecting pieces.

[0027] In this embodiment, the main frame is composed of a square-shaped upper frame, PET cross beams, PET main beams, and diagonal bracing beams. The upper frame has multiple transverse and longitudinal support beams inside, which are staggered and arranged in a grid pattern. The PET cross beams and PET main beams provide structural support in the horizontal and vertical directions of the frame, respectively, enhancing the overall strength of the frame. The diagonal bracing beams are arranged on the outside of the frame, providing additional support force to the frame and further improving its stability. Photovoltaic modules are fixed on the transverse and longitudinal support beams through connectors, ensuring that the photovoltaic modules can be stably arranged in the frame. This structural design makes the main frame have good load-bearing capacity and stability. The grid-shaped support beams provide stable support for the photovoltaic modules and also facilitate the installation and maintenance of the modules. The use of PET material makes the frame have high strength and durability, which can adapt to various environmental conditions. The arrangement of the diagonal bracing beams further enhances the overall structure of the frame, making it better withstand external forces.

[0028] In some embodiments, the floating body is made of rotational molding material and is arranged in a ring around the bottom of the main frame 3.

[0029] In this embodiment, the floating body is made of rotational molding material, which has good plasticity and corrosion resistance. The rotational molding process makes the forming process of the floating body relatively simple and low in cost. The floating body is arranged in a ring around the bottom of the main frame, which can uniformly support the main frame. The ring design helps to distribute the weight borne by the main frame, making the main frame stable on the water surface. At the same time, the characteristics of the rotational molding material make the floating body have a certain flexibility, which can adapt to different water surface conditions and environmental changes. The arrangement of the floating body at the bottom of the main frame also provides additional buoyancy for the entire system, which is beneficial to reduce the risk of sinking of the main frame in water.

[0030] As shown in Figure 2 In some embodiments, the bottom of the floating body is provided with multiple ballast tanks 6 to adjust the draft of the device.

[0031] In this embodiment, multiple ballast tanks are arranged at the bottom of the floating body, which is a key measure to adjust the draft of the device. By injecting or discharging different amounts of water in the ballast tanks, the weight and center of gravity of the floating body can be changed. When the ballast tanks are filled with water, the weight of the floating body increases and the draft increases; on the contrary, when the ballast tanks are discharged, the weight of the floating body decreases and the draft decreases. Multiple ballast tanks can be flexibly operated according to actual needs, such as when additional stability is needed, water can be injected into some ballast tanks to make the floating body sink deeper. Under different water conditions, by adjusting the amount of water in the ballast tanks, the draft of the floating body can meet the safety and operation requirements.

[0032] As shown in Figure 2As shown in some embodiments, the main body frame 3 includes two maintenance corridors 8 arranged in a cross shape at the top of the main body frame 3 and connected to each other.

[0033] In this embodiment, the top of the main body frame is provided with two maintenance corridors arranged in a cross shape and connected to each other. This design enables maintenance personnel to quickly and conveniently move between different areas at the top of the main body frame. The cross-shaped layout not only improves the efficiency of maintenance, but also provides more path options for maintenance work. The connectivity of the two maintenance corridors allows maintenance personnel to enter different areas from different directions, facilitating comprehensive maintenance and repair of the entire main body frame. At the same time, this layout enhances the overall structural stability of the main body frame, providing good support for maintenance work.

[0034] As shown in some embodiments, the main body frame 3 includes a maintenance staircase 9 connected to the two maintenance corridors 8. Figure 3 and Figure 4 As shown in some embodiments, the main body frame 3 includes a maintenance staircase 9 connected to the two maintenance corridors 8.

[0035] In this embodiment, the main body frame is provided with a maintenance staircase connected to the two maintenance corridors. The maintenance staircase provides a vertical passage for maintenance personnel, facilitating their movement between maintenance corridors at different heights. Through the maintenance staircase, maintenance personnel can easily reach the maintenance corridors at the top of the main body frame from the ground, thereby facilitating comprehensive maintenance and repair of the main body frame. This connected design ensures that maintenance personnel can quickly and conveniently move between different areas during maintenance, improving the efficiency of maintenance work.

[0036] In some embodiments, a platform base is provided below the floating body to enhance the stability of the floating photovoltaic module 1.

[0037] In this embodiment, a platform base is provided below the floating body, which effectively enhances the stability of the floating photovoltaic module. The platform base provides a larger support area for the floating body, making the balance of the floating body on the water surface more stable. It can disperse the weight borne by the floating body, reducing sinking or tilting caused by excessive local pressure. At the same time, the presence of the platform base increases the mass and inertia of the entire floating photovoltaic module, making it more stable when facing external forces such as water flow, wind waves, etc. In addition, the platform base can be connected to the floating body and other components, further strengthening the structural strength of the entire system. For example, by setting anchor on the platform base and fixing it to the bottom of the water, the floating body can be effectively prevented from drifting, ensuring that the floating photovoltaic module always remains in a safe position.

[0038] In some embodiments, the belt cable 2 is composed of two ultra-high molecular composite cables.

[0039] In this embodiment, the cable is composed of two ultra-high molecular composite ropes. Such ultra-high molecular composite ropes have excellent strength, flexibility and durability. They are made of special process and materials, and can withstand large tension and external force.

[0040] In some embodiments, the deck wave phenomenon of the floating photovoltaic module 1 is determined by the following method:

[0041] Obtain the geometric parameters of the floating photovoltaic module 1;

[0042] Based on the geometric parameters, a three-dimensional model of the floating photovoltaic module 1 is determined;

[0043] The three-dimensional model is subjected to computational domain extraction and meshing to obtain the three-dimensional model of the floating photovoltaic module 1 after meshing;

[0044] Based on the three-dimensional model of the floating photovoltaic module 1 after meshing and the simulation equation, the deck wave phenomenon of the floating photovoltaic module 1 is determined; wherein the simulation equation includes force field simulation equation, flow field simulation equation, six-degree-of-freedom motion simulation equation of the floating body, and mooring force simulation equation, and in the process of determining the deck wave phenomenon of the floating photovoltaic module 1, the flow field simulation equation is subjected to source term wave elimination.

[0045] In this embodiment, first, the geometric parameters of the floating photovoltaic module 1 are obtained, and based on these detailed parameters, a three-dimensional model of the floating photovoltaic module 1 is constructed. After completing the construction of the three-dimensional model, the model is subjected to computational domain extraction, and then meshing is performed, thereby obtaining the three-dimensional model of the floating photovoltaic module 1 after meshing. Subsequently, based on the simulation equation, numerical simulation is carried out on the three-dimensional model after meshing, so as to determine the deck wave phenomenon of the floating photovoltaic module 1. The simulation equation here includes force field simulation equation, flow field simulation equation, six-degree-of-freedom motion simulation equation of the floating body, and mooring force simulation equation. The use of multi-dimensional simulation equation makes the simulation of the deck wave phenomenon of the floating photovoltaic module 1 more comprehensive and detailed, and can accurately capture various complex physical phenomena. In addition, the flow field simulation equation is subjected to source term wave elimination. This not only effectively reduces the demand for grid quantity in the numerical wave simulation of the photovoltaic platform, avoids the time and resource consumption caused by a large number of grid calculations, but also significantly improves the simulation efficiency, making the entire simulation process more efficient and fast. In summary, the method proposed in the present application can quickly and accurately simulate the deck wave phenomenon of the floating photovoltaic module 1, providing strong data support and technical guarantee for the design optimization, safety evaluation and performance improvement of the floating photovoltaic module 1, and helping the stable development of the offshore photovoltaic industry.

[0046] In the embodiment, the calculation domain extraction aims to determine the specific area for subsequent meshing and numerical simulation. The selection of the area is directly related to the accuracy and efficiency of the simulation of the wave on deck phenomenon of the floating photovoltaic module 1. A suitable calculation domain can cover the key physical processes and areas related to the wave on deck phenomenon, and will not increase the calculation burden due to the inclusion of too many irrelevant areas. Based on the three-dimensional model of the floating photovoltaic module 1, the area around the platform itself and within a certain range around the platform is taken as the calculation domain. For example, considering the range of sea wave action, the sea area space within a certain radius around the platform and the space above the platform within a certain height (the height that the sea wave is estimated to reach) are taken as the calculation domain, so as to ensure that the whole process of the sea wave impacting the platform and the wave on deck can be captured.

[0047] In an embodiment of the present application, the flow field simulation equation is constructed by the following formula:

[0048]

[0049] ρ = a ρ 1 + (1 - a) ρ 2

[0050] μ = a μ 1 + (1 - a) μ 2

[0051] In the formula, ρ 1 is the density of water, ρ 2 is the density of air, μ 1 is the viscosity of water, μ 2 is the viscosity of air, U is the dynamic viscosity of water, U r is the dynamic viscosity of air, and a is the volume fraction of water in the calculation domain.

[0052] In the embodiment, the flow field simulation equation can depict the free surface formed by the interaction and coupling of two or more immiscible fluids. Based on this, the flow field borne by the floating photovoltaic module 1 can be simulated very accurately, effectively improving the accuracy and reliability of the simulation results, and providing data support and theoretical basis for in-depth study of the performance of the floating photovoltaic module 1 in a complex flow field environment.

[0053] In an embodiment of the present application, the six-degree-of-freedom motion simulation equation of the floating body is constructed by the following formula:

[0054]

[0055] In the formula, v f is the velocity component of the floating body along the x, y, and z directions, ω f is the angular velocity component of the floating body rotating around the x, y, and z axes, F mooring is the mooring force, F f is the total external force borne by the floating body, f c is the connecting force between the floating bodies, M f is the sum of the moments generated by the forces, and dS is the force receiving area of the structure, and m fMtotai mass of the platform, I f moment of inertia of the structure, r CS fluid force, r CM mooring force, r CG gravity force, r CF length of the force arm from the multi-body connection moment to the center of mass, t is time.

[0056] In this embodiment, the six degrees of freedom motion simulation equation of the floating body describes the dynamic behavior of a plurality of interconnected rigid bodies coupled together using different types of constraints, which can translate and rotate relative to each other. The connection constraint equation of the rigid body can be described as follows.

[0057] Multi-floating body connection constraint equation:

[0058] φ(q, t) = 0

[0059] Ja= Q

[0060] where J is the Jacobian matrix of φ, a is the acceleration of the floating body, and Q is the different quality.

[0061] In order to enforce the acceleration condition of the constraint, it is necessary to add a constraint force to the system. By introducing the Lagrange multiplier λ of all constraints

[0062] f c = J T × λ

[0063] The vector λ needs to be found so that when the constraint force f c is combined with any external force F f (such as gravity, wave force, etc.), it can generate a constraint that satisfies

[0064] Therefore, the multi-body motion equation can also be written as

[0065] Ma= J T λ + F f

[0066] Assuming Aλ = b, and multiplying the left side of the equation by the Jacobian matrix J

[0067] A = JM -1 J T

[0068] b = -JM -1 F f + Q

[0069] Substituting A and b can obtain λ, and in the case of known λ, the equation is integrated twice, that is, the generalized coordinate vector can be obtained.

[0070] In one embodiment of the present application, the mooring force simulation equation is constructed by the following formula:

[0071]

[0072]

[0073] wherein x is the horizontal distance between the fairlead and the anchor point, h is the vertical distance between the fairlead and the anchor point, T H is the horizontal component of the anchor rope tension and T V is the vertical component of the anchor rope tension, φw is the included angle formed by the mooring tension, T h is the direction vector, W is the constant weight in water corresponding to the unit mooring line length, EA is the mooring chain elastic stiffness, l s is the length of the mooring line.

[0074] In one embodiment of the present application, the force field simulation equation is constructed by the following formula:

[0075] F = 0.5 ρg 2 H 2 T 2 / 2π

[0076] wherein H is the wave height in the wave parameter, T is the period, ρ is the seawater density, g is the gravitational acceleration, and F is the wave force.

[0077] In the present embodiment, the wave height in the wave parameter, the period, the seawater density, and the gravitational acceleration can be self-defined by the person skilled in the art according to the actual use.

[0078] In one embodiment of the present application, the flow field simulation equation is subjected to source term damping by the following equation:

[0079] q φ = - γ ρ (φ - φ * )

[0080] wherein γ is the fluid force coefficient, ρ is the fluid density, φ is the current solution of the flow field simulation equation, and φ* is the value approached by the flow field simulation equation.

[0081] In the present embodiment, regarding the numerical wave making method, the source term damping method is adopted considering the numerical solution efficiency, which can select a shorter calculation domain to realize numerical wave making, unlike the damping damping method. In the calculation domain, the inlet boundary, the outlet boundary, and the two side boundaries are all set as velocity inlet boundaries, and force damping regions are set at the boundaries, with the region length being 1.5 times the incident wavelength (the optimal width of the damping region depends on the model geometric parameters). The top of the calculation domain is set as a pressure outlet edge, the floating array photovoltaic platform is set as a no-slip wall boundary (determined by the structural geometric characteristics), and the bottom of the calculation domain is also set as a no-slip wall boundary.

[0082] In the embodiment, for solving the simulation equation, the finite volume method (FVM) of unstructured grid is used to carry out numerical grid discretization on the partial differential equation, and the numerical grid can describe the characteristics of the calculation domain and can also carry out the transfer and calculation of variables. Meanwhile, considering the fluid dynamics problem of large amplitude motion of the floating photovoltaic platform, the present application uses the overlapping grid method to divide the calculation domain into a plurality of sub-grids, which can be independently formed and moved, and then combined by interpolation and information transfer at the required place, so as to simulate the motion information of the floating platform. In order to ensure the accuracy of numerical solution, the grid encryption processing of the calculation domain is also required. Considering the numerical wave making accuracy requirement, generally, 80-100 grids are required to divide one wavelength along the wave transmission direction, and at least 20 grids are required along the wave height direction. In addition, in order to facilitate the transition of the overlapping grid in the process of solving the floating body motion, a transition area is generally required to be divided around the overlapping grid, and the grid amount of the transition area and the overlapping grid area should be consistent as much as possible. In order to ensure the stability and convergence of the calculation, the convergence condition of numerical simulation is also required to be defined. The convergence condition of numerical simulation should be set according to the Courant number (CFL), and the Courant number should be controlled below 1. The Courant number can be defined as follows:

[0083]

[0084] Wherein, U Max is the maximum fluid velocity, Δx Min is the minimum structured grid size, and Δt is the calculation time step.

[0085] In an embodiment of the present application, based on the three-dimensional model of the floating photovoltaic module 1 after grid division and the simulation equation, the green water phenomenon on the deck of the floating photovoltaic module 1 is determined, including:

[0086] According to the simulation equation, the numerical simulation is carried out on each node of the three-dimensional model of the floating photovoltaic module 1 after grid division, and the green water phenomenon of each node is determined;

[0087] The green water phenomenon on the deck of the floating photovoltaic module 1 is determined through the green water phenomenon of each node.

[0088] In the present embodiment, firstly, according to the simulation equation, numerical simulation operation is carried out for each node on the three-dimensional model of the grid-divided floating photovoltaic module 1, so as to determine the wave-riding phenomenon at each node. This step can accurately capture the changes on the micro level of the model and obtain detailed data of each node. Then, through the summary and analysis of the wave-riding phenomenon of each node, the wave-riding phenomenon of the floating photovoltaic module 1 deck as a whole is determined from the micro to the macro. This analysis method from the local to the whole can comprehensively and accurately reflect the wave-riding condition of the floating photovoltaic module 1 deck under complex working conditions, and provide detailed and reliable data support for subsequent research and evaluation.

[0089] It is to be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments in accordance with the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and / or "comprising," when used in this specification, specify the presence of stated features, steps, operations, elements, components, and / or groups thereof, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and / or groups thereof.

[0090] The relative arrangement of parts and steps, numerical expressions, and numerical values set forth in the various embodiments are not intended to limit the scope of the present application unless otherwise specifically stated. It should also be clearly understood that the size of the parts shown in the attached drawings is not to scale and is merely intended to aid in the description of the application. Techniques, methods, and devices known to those of ordinary skill in the relevant art can not be discussed in detail, but should be considered as part of the specification. In all examples shown and discussed herein, any specific value should be interpreted as merely exemplary and not as a limitation. Thus, other examples of the example embodiments can have different values. It should be noted that like reference numerals and letters refer to like items in the following drawings, and thus, once an item is defined in one drawing, it need not be discussed further in subsequent drawings.

[0091] In the description of the present application, it should be understood that the orientation words such as "front, back, up, down, left, right", "transverse, vertical, perpendicular, horizontal" and "top, bottom" and the like indicate the orientation or positional relationship shown in the drawings, which are only for the convenience of describing the present application and simplifying the description, and do not indicate and imply that the devices or elements referred to must have a particular orientation or be constructed and operated in a particular orientation, unless otherwise stated, and therefore cannot be understood as a limitation on the scope of protection of the present application: the orientation words "inner, outer" refer to the inner and outer relative to the contour of the parts themselves.

[0092] For purposes of the description hereinafter, the terms "upper", "lower", "right", "left", "rear", "front", "vertical", "horizontal", and derivatives thereof shall relate to the device, as it is shown in the drawings, and shall not be construed as limiting the position of the device during use or operation in a particular orientation unless noted herein. The terms "first", "second", and the like, as used herein do not have any specific meaning unless otherwise stated, and are used only to distinguish one element from another. Unless otherwise stated, the terms "first", "second", etc. are not meant to imply that the elements so designated must be in a particular sequence, either during their fabrication, use, or operation, unless otherwise specified.

[0093] In addition, it should be noted that the use of "first", "second", etc. words to define parts is only for the convenience of distinguishing the corresponding parts, and the above words have no special meaning unless otherwise stated, and therefore cannot be understood as limiting the scope of protection of the present application.

Claims

1. A composite nearshore floating solar photovoltaic device, characterized in that, include: Multiple floating photovoltaic modules (1) are connected by cables (2) to form an array module. The floating photovoltaic modules on the outside of the array module are provided with anchor chains and are connected to pile-type anchor blocks through the anchor chains to achieve buffer mooring. The floating photovoltaic module (1) includes a main frame (3) and a photovoltaic module (4). The photovoltaic module (4) is set above the main frame (3). A float is set at the bottom of the main frame (3) to enable the array module to float on the sea. The height of the main frame (3) is greater than the preset height so that the photovoltaic module (4) can absorb the light energy directly irradiated to it on the front and absorb the light energy reflected from the sea on the back, thereby generating electricity. The preset height is determined based on the wave phenomenon on the deck of the floating photovoltaic module (1); The wave phenomenon on the deck of the floating photovoltaic module (1) is determined in the following way: Obtain the geometric parameters of the floating photovoltaic module (1); Based on the geometric parameters, a three-dimensional model of the floating photovoltaic module (1) is determined; The computational domain of the three-dimensional model is extracted and meshed to obtain a three-dimensional model of the floating photovoltaic module (1) after meshing. Based on the three-dimensional model and simulation equations of the floating photovoltaic module (1) after the grid division, the wave phenomenon on the deck of the floating photovoltaic module (1) is determined; The simulation equations include force field simulation equations, flow field simulation equations, six-degree-of-freedom motion simulation equations of the floating body, and mooring force simulation equations. In the process of determining the wave phenomenon on the deck of the floating photovoltaic module (1), the flow field simulation equations are processed by source term wave suppression. The flow field simulation equations are constructed using the following formula: ρ=aρ1+(1-a)ρ2 μ=αμ1+(1-α)μ2 In the formula, ρ1 is the density of water, ρ2 is the density of air, μ1 is the viscosity of water, μ2 is the viscosity of air, U is the dynamic viscosity of water, and U r Let be the dynamic viscosity of air, and α be the volume fraction of water in the computational domain; The six-degree-of-freedom motion simulation equations for the floating body are constructed using the following formula: In the formula, v f Let ω be the velocity components of the floating body along the x, y, z directions. f F represents the angular velocity components of the floating body rotating about the x, y, and z axes. mooring For mooring force, F f For the floating body to be subjected to the net external force, f c M is the connecting force between multiple floating bodies. f The sum of the moments generated by the various forces, dS is the area of ​​the structure subjected to the forces, m f For the overall platform quality, I f Let r be the rotational inertia of the structure. CS For fluid force, r CM For mooring force, r CG For gravity, r CF t represents the lever arm length of the multibody connection force from the center of mass, and t represents time. The six-degree-of-freedom motion simulation equations of the floating bodies describe the dynamic behavior of multiple interconnected floating bodies, coupled together using different types of constraints to translate and rotate relative to each other. The constraint equations for the multi-floating body connectors are as follows: φ(q,t)=0 Ja=Q In the formula, J is the Jacobian matrix of φ, a is the acceleration of the floating body, and Q represents heterogeneity; To enforce the acceleration conditions, constraint forces need to be added to the system, which is achieved by introducing the Lagrange multiplier λ of all constraints. f c =J T ×λ We need to find the vector λ so that we can combine the constraint forces f. c With any external force F f In all cases, it can generate results that satisfy the constraints; Therefore, the equations of motion for a multi-buoy body can be written as follows: Ma=J T λ+F f Assuming Aλ = b, and multiplying the equations of motion of the multi-buoyant body by the Jacobian matrix J on the left, we get... A=JM -1 J T b=-JM -1 F f +Q Substituting A and b, we can find λ. Given λ, we can then apply the equation... By performing two integrations, the generalized coordinate vector can be obtained; The mooring force simulation equations are constructed using the following formula: In the formula, x is the horizontal distance between the cable guide hole and the anchor point, h is the vertical distance between the cable guide hole and the anchor point, and T is the vertical distance between the cable guide hole and the anchor point. H The horizontal component of the anchor rope tension and T V Let φ be the vertical component of the anchor rope tension, φw be the angle formed by the mooring tension, W be the constant weight per unit length of mooring line in water, EA be the elastic stiffness of the mooring chain, and l be the vertical component of the anchor rope tension. s This refers to the length of the mooring line; The force field simulation equations are constructed using the following formula: F=0.5ρ3g 2 H 2 T 2 / 2π In the formula, H is the wave height, T is the period, ρ3 is the seawater density, g is the gravitational acceleration, and F is the wave force. The flow field simulation equations are processed by source term mitigation using the following equations: q φ =-gr4(φ-φ * ) In the formula, γ is the fluid dynamic coefficient, ρ4 is the fluid density, φ is the current solution of the flow field simulation equation, and φ* is the value that the flow field simulation equation approaches.

2. The device according to claim 1, characterized in that, The main frame (3) is made of PET material, and diagonal bracing beams (7) are provided on the outside of the main frame (3).

3. The device according to claim 2, characterized in that, The float is made of rotational molding material and is arranged in a surrounding manner at the bottom of the main frame (3).

4. The device according to claim 3, characterized in that, The bottom of the float is provided with multiple ballast tanks (6) to adjust the draft of the equipment.

5. The device according to claim 1, characterized in that, The main frame (3) includes two maintenance corridors (8), which are arranged in a cross shape on the top of the main frame (3) and are interconnected.

6. The device according to claim 5, characterized in that, The main frame (3) includes a maintenance escalator (9) which is connected to two maintenance corridors (8).

7. The device according to claim 6, characterized in that, A platform base is provided below the float to enhance the stability of the floating photovoltaic module (1).

8. The device according to claim 1, characterized in that, The cable (2) consists of two ultra-high molecular weight composite cables.

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