Fishing-light complementary wind-resistant photovoltaic support and weak coupling numerical simulation method thereof

Abstract

The invention discloses a fishing-light complementary wind-resistant photovoltaic support and a weak coupling numerical simulation method thereof, and belongs to the technical field of photovoltaic equipment.The wind-resistant photovoltaic support comprises two or more flexible cables crossing over a fish pond and stand columns on the two sides of the flexible cables, and the two or more flexible cables support a photovoltaic module in parallel; the middle parts of the supporting rods between the adjacent flexible cables are hinged with the vertical rods; the lower ends of the vertical rods are connected with the underwater damping structure; according to the weak coupling numerical simulation method, wind load, support vibration and a water resistance effect are subjected to step-by-step coupling calculation, wind tunnel test data are mapped to the surface of a photovoltaic module in a partitioned mode, and non-uniform wind pressure distribution is simulated; and capturing the fluid-solid interaction process of the damping net by adopting a dynamic grid technology. Wind-induced vibration is transmitted to the underwater damping structure by adopting a composite structure of an underwater damping structure and flexible hinging, and large-amplitude vibration of the bracket is inhibited by using resistance of water; through a step-by-step coupling strategy, high calculation cost of a traditional strong coupling method is avoided, and interaction precision of a key physical field is guaranteed.

Description

Technical Field

[0001] The present invention belongs to the technical field of photovoltaic equipment, and in particular relates to a fish-photovoltaic complementary wind-resistant photovoltaic bracket and a weak coupling numerical simulation method thereof. Background Art

[0002] Fishery-solar hybridization is a new green energy model that combines photovoltaic power generation with aquaculture. By installing photovoltaic panels above water bodies such as fish ponds and lakes, it achieves the dual benefits of "generating electricity above and raising fish below." This model not only improves land resource utilization but also promotes the coordinated development of clean energy and ecological aquaculture. In recent years, with the continuous advancement of flexible photovoltaic technology, it has gradually become a preferred option for fishery-solar hybrid projects due to its lightweight, easy installation, and good adaptability to complex terrain.

[0003] Due to their low rigidity, flexible photovoltaic racks are prone to significant vibration in strong winds. This not only affects the stability and efficiency of photovoltaic power generation, but can also exacerbate fatigue damage to the components and racks, shortening their service life. More seriously, severe vibrations can cause component detachment or structural instability, posing potential safety hazards to the aquaculture facilities below and the surrounding environment.

[0004] Currently, common solutions to the problem of large vibrations of flexible photovoltaic modules in strong winds include: (1) Increase support stiffness: Improve wind resistance by strengthening the support structure, but this method will significantly increase material costs.

[0005] (2) Adding counterweights: Attaching counterweights to the bracket to suppress displacement. However, this method will significantly increase the overall weight, thereby weakening the lightweight advantage of flexible photovoltaic modules.

[0006] (3) Optimize module layout: Reduce the impact of wind load by adjusting the arrangement of photovoltaic modules.

[0007] Although these methods have alleviated the displacement problem of flexible photovoltaics to a certain extent, they often come at the expense of the lightweight and low-cost advantages of flexible photovoltaics, making it difficult to balance the contradiction between lightweight and wind resistance. Summary of the Invention

[0008] In order to solve the above problems, the present invention provides a fish-photovoltaic complementary wind-resistant photovoltaic bracket and a weak coupling numerical simulation method thereof.

[0009] To achieve the above object, the technical solutions adopted by the present invention are as follows: A wind-resistant photovoltaic bracket for complementary fishing and photovoltaic power generation comprises a flexible cable spanning over a fish pond and a column arranged at the edge of the fish pond. The flexible cables are arranged in parallel in two or more pieces for supporting photovoltaic modules. Adjacent flexible cables are connected by a rigid support rod. The middle portion of the support rod is hingedly connected to the upper end of a rigid vertical rod. The lower end of the vertical rod extends 1 to 1.5 meters below the water surface. The lower end of the vertical rod is connected to an underwater damping structure.

[0010] Furthermore, the underwater damping structure includes a flexible damping net and multiple rigid branch rods, the multiple branch rods are arranged in an umbrella shape, the tops of the multiple branch rods are connected to the lower ends of the vertical rods, and the ends of the multiple branch rods are respectively connected to the four edges of the damping net, and the porosity of the damping net is 20%.

[0011] Furthermore, the upper end of the vertical rod is connected to the support rod through a hinge joint, and the hinge joint includes a spherical crown-shaped connecting seat and a ball head. The outer wall of the connecting seat is fixed to the bottom surface of the support rod, and the ball head is arranged in the connecting seat, and the opening diameter of the connecting seat is smaller than the diameter of the ball head; the ball head is fixed to the upper end of the vertical rod.

[0012] Furthermore, the vertical rod can swing within 45 degrees; and an elastic bushing is filled between the connecting seat and the ball head.

[0013] Furthermore, the branch rod is connected to the damping net through a quick release buckle.

[0014] Furthermore, there are 3 to 5 branch rods, and the angle between two adjacent branch rods is 120° to 150°.

[0015] Furthermore, the support rod and the vertical rod are made of carbon fiber or glass fiber reinforced plastic; the connecting seat and the ball head are both made of stainless steel.

[0016] Furthermore, the damping net is made of high-strength nylon or polyester fiber, and the surface of the damping net is coated with an anti-corrosion coating.

[0017] Furthermore, the size of the damping net does not exceed 3 square meters.

[0018] The present invention also provides a weak coupling numerical simulation method for a fish-photovoltaic complementary wind-resistant photovoltaic bracket, comprising the following steps: Step 1: Collect the actual dimensions of the above-mentioned fish-solar complementary wind-resistant photovoltaic bracket; Step 2: Use ANSYS APDL software to build a finite element model of the flexible photovoltaic support. Add support rods between adjacent flexible cables where the damping net is located. Apply prestress to the flexible cables, perform static calculations, and adjust the prestress to match the vertical span ratio of the wind-resistant photovoltaic support for fish-solar hybrid systems in actual projects. This results in a finite element model of the flexible photovoltaic support and support rods. Step 3: The wind pressure coefficient time history data of the photovoltaic modules obtained from the wind tunnel test is restored to the wind-resistant photovoltaic support structure used in the actual project at a time scale ratio, and multiplied by the basic wind pressure to obtain the wind pressure time history data of each area of the photovoltaic module. Each photovoltaic module in the finite element model is divided into n parts, corresponding to the areas where the n measurement points in each column of the test model are located. The finite element model is loaded. After the calculation is completed, the vertical displacement change time history data of each node on the flexible cable are exported as a text file. Step 4: Use the MATLAB program to read the vertical displacement time history data U1 and U2 of the mid-span nodes of the two flexible cables, calculate the composite vertical displacement time history U(t) and torsional displacement time history A(t) at the mid-span position, and obtain the average value U of the vertical displacement and torsional displacement at the mid-span position by calculation. m 、A m and pulsation value U s 、A s ; The implementation example of the MATLAB program is as follows: U(t)=(U1+U2) / 2; U m =[mean(U(t))] U s =[std(U(t))] A(t)=(U1-U2) / d*180 / 3.14; % d is the horizontal projection distance of the two cables A m =[mean(A(t))] A s =[std(A(t))] Step 5: In the SpaceClaim software, first draw the water area, label the top surface "output" and the other surfaces "wall." Open the SpaceClaim software again, draw the shape of the damping mesh, label it "wang," and create a rectangular damping region that wraps the damping mesh, labeling the surface "neibumian." Step 6: Open the Mesh module in ANSYS APDL software, import the water area geometry model, change all growth rates to 1.1, and keep other parameters as default to generate a volume mesh. Open the damping area, change all growth rates to 1.1, apply local mesh refinement to the damping mesh boundary area, and keep other parameters as default to generate a volume mesh. Step 7: Write a user-defined function (UDF) to store the vertical displacement time history data calculated in ANSYS APDL software in the UDF in the form of a static array, and implement dynamic boundary condition mapping through the CG_MOTION macro; Step 8: Open the Solution module in ANSYS Fluent, read in the water body mesh, and read in the damping body mesh as an additional mesh. Adjust the fluid materials to liquid water and air, select the volume of fluid method (vof) for multiphase flow, select the k-epsilon model for viscosity model, adjust the overlapping mesh interface, adjust the dynamic mesh parameters, output the "wang" surface average pressure, and then start the calculation. Step 9: Apply the resistance time history data of the damping net under water obtained in the Solution module of ANSYS Fluent software to the support rod. Simultaneously, apply the wind load to the photovoltaic module. Calculate for 100 seconds to obtain the vertical displacement change time history data of each node on the flexible cable. Repeat step 4 to calculate the average value of vertical displacement and torsional displacement at the mid-span position after the damping network is installed. m 、A m and pulsation value U s 、A s ; Step 10: Compare the changes in the average and pulsation values of the vertical displacement and torsional displacement at the mid-span position before and after the installation of the damping net to determine the vibration suppression effect of the damping net.

[0019] Compared with the prior art, the present invention has the following technical advances: 1. The present invention adopts a composite wind-resistant structure of "underwater damping structure + flexible hinge", which transmits wind-induced vibrations to the underwater damping net through support rods, and uses the resistance of water to suppress the large vibrations of the photovoltaic bracket.

[0020] 2. The use of support rods made of carbon fiber or glass fiber and high-strength polymer damping nets greatly reduces the overall weight, fully retaining the characteristics of flexible photovoltaics that are light, easy to install, and adaptable to complex terrain.

[0021] 3. The underwater damping net is made of environmentally friendly materials, which does not affect the aquatic ecology and maintains the natural state of the water. This "photovoltaic + ecological" collaborative design concept enables the project to generate electricity while also taking into account ecological and environmental protection. It conforms to the development trend of modern green energy and has significant social and environmental benefits.

[0022] 4. This invention utilizes a weak-coupling numerical simulation method to couple the calculation of wind loads, bracket vibration, and water resistance effects in a step-by-step manner. By mapping wind tunnel test data onto the PV panel surface, non-uniform wind pressure distribution is accurately simulated. Simultaneously, dynamic mesh technology is employed to capture the fluid-structure interaction within the underwater mesh structure. This step-by-step coupling strategy avoids the high computational cost of traditional strong-coupling methods while ensuring the accuracy of interactions between key physical fields. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The accompanying drawings are used to provide further understanding of the present invention and constitute a part of the specification. They are used to explain the present invention together with the embodiments of the present invention and do not constitute a limitation of the present invention.

[0024] In the attached figure: Figure 1 A schematic structural diagram of a wind-resistant photovoltaic bracket for fish-solar hybridization provided by an embodiment of the present invention; Figure 2 This is a schematic diagram of the cross-sectional structure at the junction of the vertical rod and the support rod in an embodiment of the present invention; Figure 3 is a schematic diagram of an underwater damping structure according to an embodiment of the present invention; Figure 4 is a cross-sectional schematic diagram of a hinge joint according to an embodiment of the present invention; Figure 5 It is a schematic diagram of the working principle of the present invention; Figure 6 It is the finite element model diagram of the present invention; Figure 7 Schematic diagram of finite element division of the damping area of the present invention; Figure 8 This is a displacement time history comparison diagram of the present invention (blue is before adding the damping net, orange is after adding the damping net); In the figure: 1. Support rod; 2. Photovoltaic module; 3. Flexible cable; 4. Vertical rod; 5. Hinge joint; 6. Branch rod; 7. Damping net; 8. Quick release buckle; 9. Elastic bushing. DETAILED DESCRIPTION

[0025] The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described in detail in some embodiments. The embodiments of the present invention will be described below with reference to the accompanying drawings.

[0026] like Figure 1 、 Figure 2 As shown, a wind-resistant photovoltaic support for fish-photovoltaic hybrid systems includes a flexible cable 3 spanning over a fish pond and columns arranged at the edge of the fish pond. The flexible cables 3 are arranged in parallel in two or more rows to support photovoltaic modules 2. Adjacent flexible cables 3 are connected by a rigid support rod 1. The middle of the support rod 1 is hingedly connected to the upper end of a rigid vertical rod 4. The lower end of the vertical rod 4 extends 1 to 1.5 meters below the water surface. The lower end of the vertical rod 4 is connected to an underwater damping structure. Figure 3As shown, the underwater damping structure includes a flexible damping net 7 and multiple rigid branch rods 6 arranged in an umbrella shape. The tops of the branch rods 6 are connected to the lower ends of the vertical rods 4, and the ends of the branch rods 6 are connected to the four edges of the damping net 7 via quick-release buckles 8. The porosity of the damping net 7 is 20%. When wind acts on the photovoltaic module 2, the photovoltaic bracket is displaced, and the support rod 1 drives the damping net 7 below. When the damping net 7 moves underwater, it generates resistance in the opposite direction of movement, which is transmitted by the support rod 1 to the photovoltaic bracket, thereby suppressing the vibration of the photovoltaic bracket.

[0027] like Figure 2 、 Figure 4 As shown, the upper end of the vertical rod 4 is connected to the middle of the support rod 1 via a hinge joint 5. The hinge joint 5 includes a spherical connection seat and a ball head. The outer wall of the connection seat is fixed to the bottom surface of the support rod 1. The ball head is set in the connection seat, and the opening diameter of the connection seat is smaller than the diameter of the ball head. The ball head is fixed to the upper end of the vertical rod 4. The elastic bushing 9 is filled between the connection seat and the ball head. The elastic bushing is a highly elastic rubber bushing that absorbs high-frequency micro-vibrations and reduces metal fatigue.

[0028] During production, there are three to five branch rods 6, with the angle between two adjacent branch rods 6 being 120° to 150°. The support rod 1 and vertical rod 4 are made of carbon fiber or glass fiber reinforced plastic, combining lightweight and high strength. Furthermore, the connecting socket and ball head are both made of stainless steel. The ball head at the upper end of the vertical rod is inserted into the connecting socket and secured with a locking ring. The hinge allows the vertical rod to swing within 45°.

[0029] The damping net 7 is made of high-strength nylon or polyester fiber with an anti-corrosion coating. High-strength nylon can be reinforced with nylon 6 / 6 (polyamide 66), nylon 12, or nylon 66. The damping net 7 is connected to the branch rod 6 via a quick-release buckle 8, allowing for adjustable tension.

[0030] To further optimize the above solution, the size of the damping net 7 does not exceed 3 square meters.

[0031] The present invention also provides a weak coupling numerical simulation method for a fish-photovoltaic complementary wind-resistant photovoltaic bracket, comprising the following steps: Step 1: Collect the actual dimensions of the above-mentioned fish-solar complementary wind-resistant photovoltaic bracket; The actual dimensions include: the height of the flexible cable from the ground, the span L, the sag d, the inclination angle β, the spacing between photovoltaic modules, the number of spans and rows, the material properties of the flexible photovoltaic bracket, the cross-sectional area, etc.

[0032] Step 2: Use ANSYS APDL software to build a finite element model of the flexible photovoltaic support. Add support rods between adjacent flexible cables where the damping net is located. Apply prestress to the flexible cables, perform static calculations, and adjust the prestress to match the vertical span ratio of the wind-resistant photovoltaic support for fish-solar hybrid systems in actual projects. This results in a finite element model of the flexible photovoltaic support and support rods. Step 3: The wind pressure coefficient time history data of the photovoltaic modules obtained from the wind tunnel test is restored to the wind-resistant photovoltaic support structure used in the actual project at a time scale ratio, and multiplied by the basic wind pressure to obtain the wind pressure time history data of each area of the photovoltaic module. Each photovoltaic module in the finite element model is divided into n parts, corresponding to the areas where the n measurement points in each column of the test model are located. The finite element model is loaded. After the calculation is completed, the vertical displacement change time history data of each node on the flexible cable are exported as a text file. Step 4: Determine the composite vertical displacement time history and torsional displacement time history at the mid-span position using the vertical displacement time history data of the mid-span nodes of the two flexible cables, and obtain the average and pulsation values of the vertical and torsional displacements at the mid-span position by calculation; Step 5: In the SpaceClaim software, first draw the water area, label the top surface "output" and the other surfaces "wall." Open the SpaceClaim software again, draw the shape of the damping mesh, label it "wang," and create a rectangular damping region that wraps the damping mesh, labeling the surface "neibumian." Step 6: Open the Mesh module in ANSYS Fluent, import the water area geometry model, change all growth rates to 1.1, and keep other parameters as default to generate a volume mesh. Open the damping area, change all growth rates to 1.1, apply local mesh refinement to the boundary area of the damping mesh, and keep other parameters as default to generate a volume mesh. Step 7: Write a user-defined function (UDF) to store the vertical displacement time history data calculated by ANSYS APDL software in the UDF in the form of a static array, and implement dynamic boundary condition mapping through the CG_MOTION macro; Step 8: Open the Solution module in ANSYS Fluent, read in the water body mesh, and read in the damping body mesh as an additional mesh. Adjust the fluid materials to liquid water and air, select the volume of fluid method (vof) for multiphase flow, select the k-epsilon model for viscosity model, adjust the overlapping mesh interface, adjust the dynamic mesh parameters, output the "wang" surface average pressure, and then start the calculation. Step 9: Apply the resistance time history data of the damping net under water obtained in the Solution module of ANSYS Fluent software to the support rod. Simultaneously, apply the wind load to the photovoltaic module. Calculate for 100 seconds to obtain the vertical displacement change time history data of each node on the flexible cable. Repeat step 4 to calculate the average value of vertical displacement and torsional displacement at the mid-span position after the damping network is installed. m 、A m and pulsation value U s 、A s ; Step 10: Compare the changes in the average vertical displacement and torsional displacement at the mid-span position before and after the deployment of the damping net to determine the vibration suppression effect of the underwater damping structure.

[0033] The above solution is explained below through a specific embodiment.

[0034] 1) This study uses a flexible photovoltaic system project as a background. This project features a single-row, single-span structure with a span of L = 19.9 m, a height of 2.5 m, a vertical span ratio of L / 200, and an inclination angle of 25°. The module dimensions are 2.278 m * 1.134 m * 0.03 m, with a spacing of 0.04 m between adjacent modules and a spacing of 1.4 m between two flexible cables. Support rods, vertical rods, and an underwater damping net are installed at the mid-span of this flexible photovoltaic system. Node coordinates and elements are created. Finite element modeling is performed based on this information, along with material properties and cross-sectional areas. The applied prestress is adjusted to achieve a vertical span ratio of L / 200. The prestress in the windward flexible cable is 19.1 kN, and the prestress in the other flexible cable is 22.7 kN.

[0035] 2) During finite element modeling, the PV module was divided into six sections, and a wind load history with a base wind pressure of 0.5 was applied to each section. The wind load history was calculated by multiplying the wind pressure coefficient history obtained from the rigidity pressure test of the flexible PV mount by the base wind pressure. The calculation was performed for a wind direction angle of 0°. Large deformation and stress stiffening effects were enabled during the calculation, with a total calculation time of 100 seconds. A variable step-size solution strategy was used, with a base load step of 0.001 seconds and a dynamic time step adjustment range of 0.0001 to 0.002 seconds. The adaptive time step control module was enabled, and a result was output every 20 load steps. The vertical displacement history of the mid-span node was obtained using these settings.

[0036] 3) Import the mid-span displacement time history file into a MATLAB file and convert it into the average and pulsation values of vertical and torsional displacements. The calculated average and pulsation values of the vertical displacement at a wind direction angle of 0° are -0.254m and 0.058m, respectively, and the wind-induced vibration coefficient is 1.571.

[0037] 4) In the SpaceClaim software, first draw a 11m x 11m x 8m water area, label the top surface "output" and the remaining surfaces "wall." Open the software again and create a 3m x 3m x 2m rectangular damping region, labeling the surface "neibumian." Within the damping region, draw a circle with a diameter of 1m, a porosity of 20%, and a tensile thickness of 2mm, labeling it "wang."

[0038] 5) Open the Mesh module in ANSYS Fluent, import the water geometry, change the Growth Rate to 1.1, and leave all other settings as default. Generate the volume mesh. Open the damping region, add a local dimension, select "wang," and set the Growth Rate to 1.1. The target mesh size should match the thickness of "wang." Generate the surface mesh with a minimum size of 0.002m and a maximum size of 0.04m. Set the Growth Rate to 1.1 and apply proximity detection to the faces. Describe the geometry and change the Geometry Type to indicate that the geometry consists solely of fluid regions with no voids. When updating boundaries, change "neibumian" to "internal." When updating regions, change the "wang" region to "dead" and all other regions to "fluid." Add a boundary layer, select "wang," select "uniform" for the offset method type, set the number of layers to 4, and select Grow in "selected-labels." Generate the volume mesh with poly-hexcore fill, 4 buffer layers, and a minimum element length of 0.002m. Complete the meshing.

[0039] 6) Write a user-defined function (UDF) to store the vertical displacement time history data calculated by ANSYS APDL software in the UDF as a static array, and implement dynamic boundary condition mapping through the CG_MOTION macro (due to the large amount of data, 5 data points are shown again): #include "udf.h" #define NUM_POINTS 5 / / Number of data points static real time_data[NUM_POINTS] = {0.00, 0.02, 0.04, 0.06, 0.08}; / / time series static real displacement_data[NUM_POINTS] = {0.00, -0.01, -0.03, -0.07, -0.12}; / / Vertical displacement change time history data DEFINE_CG_MOTION(velocity, dt, vel, omega, time, dtime) { for (int i = 0; i < NUM_POINTS - 1; i++) { if (time >= time_data[i] && time < time_data[i+1]) { vel[2] = (displacement_data[i+1] - displacement_data[i]) / (time_data[i+1] - time_data[i]); / / Calculate segment speed break; } } } Open the Solution module in ANSYS Fluent, import the water body mesh, and the damping body mesh as an additional mesh. Change the fluid material to liquid water and air, select Vof for multiphase flow, check Implicit volume force, select k-epsilon for viscosity model, and set the overlapped mesh interface. Compile the UDF, select Smoothing and Remeshing for the dynamic mesh method, set 6 degrees of freedom, adjust the dynamic mesh parameters, set the output to "wang" surface average pressure, and start the calculation.

[0040] 8) Apply the resistance time history data obtained from the underwater motion of the damping network in the Solution module of ANSYS Fluent software to the supporting rigid rods. Simultaneously, apply the wind load to the photovoltaic module. Calculate for 100 seconds to obtain the vertical displacement of each node.

[0041] Repeating step 4, we calculated the average and pulsation values of the vertical displacement at a 0° wind direction angle after the damping net was deployed to be -0.257m and 0.037m, respectively, with a wind-induced vibration coefficient of 1.36. By comparison, the average vertical displacement at the mid-span position remained almost unchanged before and after the damping net was deployed, but the pulsation value decreased by 36.2%, and the wind-induced vibration coefficient decreased by 13.4%, demonstrating significant vibration suppression.

[0042] In summary, the present invention has the following advantages: 1. This invention utilizes a composite wind-resistant structure combining an underwater damping structure with flexible hinges. Rigid support rods transmit wind-induced vibrations to an underwater mesh damping net, leveraging the water's resistance to suppress large-scale vibrations of the photovoltaic mount. The hinges are embedded with highly elastic rubber bushings to absorb high-frequency micro-vibrations while also allowing the structure to oscillate adaptively with wind and water flow. This dual vibration damping mechanism effectively suppresses large-scale vibrations of the mount, preventing photovoltaic module dislodgment and structural fatigue damage.

[0043] 2. The device utilizes rigid support rods made of carbon fiber or fiberglass and a high-strength polymer damping mesh, significantly reducing overall weight while retaining the flexible photovoltaic characteristics of portability, ease of installation, and adaptability to complex terrain. The use of quick-release buckles ensures ease of installation and facilitates subsequent maintenance and replacement, truly achieving a technological breakthrough in "using light to control vibration."

[0044] 3. The underwater damping structure utilizes environmentally friendly materials, and its mesh structure does not impact the aquatic ecosystem, preserving the natural state of the water. This collaborative "photovoltaic + ecological" design concept allows the project to simultaneously generate electricity and protect the ecological environment, aligning with the development trend of modern green energy and delivering significant social and environmental benefits.

[0045] 4. This invention utilizes a weak-coupling numerical simulation method to couple the calculation of wind loads, bracket vibration, and water resistance effects in a step-by-step manner. By mapping wind tunnel test data onto the PV panel surface, non-uniform wind pressure distribution is accurately simulated. Simultaneously, dynamic mesh technology is employed to capture the fluid-structure interaction within the underwater mesh structure. This step-by-step coupling strategy avoids the high computational cost of traditional strong-coupling methods while ensuring the accuracy of interactions between key physical fields.

[0046] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art will be able to modify the technical solutions described in the aforementioned embodiments or substitute equivalents for some of the technical features. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the claims of the present invention.

Claims

1. A wind-resistant photovoltaic bracket for fish-solar hybridization, characterized by: It includes flexible cables spanning over the fish pond and columns arranged at the edge of the fish pond. There are two or more flexible cables arranged in parallel to support photovoltaic modules. Adjacent flexible cables are connected by rigid support rods. The middle part of the support rod is hingedly connected to the upper end of a rigid vertical rod. The lower end of the vertical rod extends 1 to 1.5 meters below the water surface. The lower end of the vertical rod is connected to an underwater damping structure.

2. The wind-resistant photovoltaic bracket for fish-photovoltaic hybridization according to claim 1, characterized in that: The underwater damping structure includes a flexible damping net and multiple rigid branch rods. The multiple branch rods are arranged in an umbrella shape. The tops of the multiple branch rods are connected to the lower ends of the vertical rods, and the ends of the multiple branch rods are respectively connected to the four edges of the damping net. The porosity of the damping net is 20%.

3. The wind-resistant photovoltaic bracket for fish-photovoltaic hybridization according to claim 2, characterized in that: The upper end of the vertical rod is connected to the support rod through a hinge joint, and the hinge joint includes a spherical crown-shaped connecting seat and a ball head. The outer wall of the connecting seat is fixed to the bottom surface of the support rod, and the ball head is arranged in the connecting seat, and the opening diameter of the connecting seat is smaller than the diameter of the ball head; the ball head is fixed to the upper end of the vertical rod.

4. The wind-resistant photovoltaic support for fishery and photovoltaic hybridization according to claim 3, characterized in that: The vertical rod can swing within 45 degrees; an elastic bushing is filled between the connecting seat and the ball head.

5. The wind-resistant photovoltaic support for fishery and photovoltaic hybridization according to claim 2, characterized in that: The branch rods are connected to the damping net via quick-release buckles.

6. The wind-resistant photovoltaic support for fishery and photovoltaic hybridization according to claim 2, characterized in that: There are 3 to 5 branch rods, and the angle between two adjacent branch rods is 120° to 150°.

7. The wind-resistant photovoltaic support for fishery and photovoltaic hybridization according to claim 3, characterized in that: The support rod and the vertical rod are made of carbon fiber or glass fiber reinforced plastic; the connecting seat and the ball head are made of stainless steel.

8. The wind-resistant photovoltaic support for fishery and photovoltaic hybridization according to claim 2, characterized in that: The damping net is made of high-strength nylon or polyester fiber, and the surface of the damping net is coated with an anti-corrosion coating.

9. The wind-resistant photovoltaic support for fishery and photovoltaic hybridization according to claim 2, characterized in that: The size of the damping net does not exceed 3 square meters.

10. A weak coupling numerical simulation method for a wind-resistant photovoltaic support with fish-photovoltaic complementarity, characterized in that: The steps include: Step 1: Collecting the actual dimensions of the wind-resistant photovoltaic bracket for fish-solar complementary use as described in any one of claims 2 to 9; Step 2: Use ANSYS APDL software to build a finite element model of the flexible photovoltaic support. Add support rods between adjacent flexible cables where the damping net is located. Apply prestress to the flexible cables, perform static calculations, and adjust the prestress to match the vertical span ratio of the wind-resistant photovoltaic support for fish-solar hybrid systems in actual projects. This results in a finite element model of the flexible photovoltaic support and support rods. Step 3: The wind pressure coefficient time history data of the photovoltaic modules obtained from the wind tunnel test is restored to the wind-resistant photovoltaic support structure used in the actual project at a time scale ratio, and multiplied by the basic wind pressure to obtain the wind pressure time history data of each area of the photovoltaic module. Each photovoltaic module in the finite element model is divided into n parts, corresponding to the areas where the n measuring points in each column of the test model are located. The finite element model is loaded. After the calculation is completed, the vertical displacement change time history data of each node on the flexible cable are respectively exported. Step 4: Determine the composite vertical displacement time history and torsional displacement time history at the mid-span position using the vertical displacement time history data of the mid-span nodes of the two flexible cables, and obtain the average and pulsation values of the vertical and torsional displacements at the mid-span position by calculation; Step 5: In the SpaceClaim software, first draw the water area, label the top surface "output" and the other surfaces "wall." Open the SpaceClaim software again and draw the shape of the damping mesh, labeling it "wang." Create a rectangular damping region that wraps the damping mesh, labeling the surface "neibumian." Step 6: Open the Mesh module in ANSYS APDL software, import the water area geometry model, change all growth rates to 1.1, and keep other parameters as default to generate the volume mesh; Open the damping area, change all growth rates to 1.1, apply local mesh refinement to the damping mesh boundary area, and keep other parameters as default to generate a volume mesh; Step 7: Write a user-defined function (UDF) to store the vertical displacement time history data calculated in ANSYS APDL software in the UDF in the form of a static array, and implement dynamic boundary condition mapping through the CG_MOTION macro; Step 8: Open the Solution module in ANSYS Fluent, read in the water body mesh, and read in the damping body mesh as an additional mesh. Adjust the fluid materials to liquid water and air, select the volume of fluid method (vof) for multiphase flow, and the k-epsilon model for viscosity model. Adjust the overlapping mesh interface and the dynamic mesh parameters. Output the "wang" surface average pressure and start the calculation. Step 9: Apply the time-history data of the resistance generated by the damping net during underwater motion, obtained in the Solution module of ANSYS Fluent software, to the support rod. Simultaneously, apply the wind load to the photovoltaic module. Calculate for 100 seconds to obtain the time-history data of the vertical displacement change of each node on the flexible cable. Repeat step 4 to calculate the average and pulsation values of the vertical and torsional displacements at the mid-span position after the damping net is installed. Step 10: Compare the changes in the average and pulsation values of the vertical displacement and torsional displacement at the mid-span position before and after the installation of the damping net to determine the vibration suppression effect of the damping net.

Images