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

Abstract

The application discloses a fish-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 flexible ropes and vertical columns on both sides of the flexible ropes which span above fish ponds. Two or more flexible ropes support photovoltaic modules in parallel. The middle part of the support rod between adjacent flexible ropes is hingedly connected with a vertical rod. The lower end of the vertical rod is connected with underwater damping structures. The weak coupling numerical simulation method step-by-step couples wind load, support vibration and water resistance effect, maps wind tunnel test data to the surface of the photovoltaic module in sections, and simulates non-uniform wind pressure distribution. The dynamic mesh technology is adopted to capture the fluid-solid interaction process of the damping net. The application adopts the composite structure of "underwater damping structure + flexible hinge" to transfer wind-induced vibration to the underwater damping structure, and utilizes the water resistance to suppress the large vibration of the support. Through the step-by-step coupling strategy, the high calculation cost of the traditional strong coupling method is avoided, and the interaction precision of key physical fields is ensured.

Description

Technical Field

[0001] This invention belongs to the field of photovoltaic equipment technology, and specifically relates to a wind-resistant photovoltaic support structure that integrates fishing and solar power and its weakly coupled numerical simulation method. Background Technology

[0002] Solar-aquaculture hybridization is a new green energy model that combines photovoltaic power generation with aquaculture. By installing photovoltaic modules above fishponds, lakes, and other bodies of water, it achieves the dual benefits of "power generation above, fish farming below." This model not only improves land resource utilization but also promotes the synergistic development of clean energy and ecological aquaculture. In recent years, with the continuous advancement of flexible photovoltaic technology, its lightweight design, convenient installation, and good adaptability to complex terrain have gradually made it the preferred solution for solar-aquaculture hybridization projects.

[0003] Because flexible photovoltaic (PV) supports have low stiffness, they are prone to significant vibrations under strong winds. This not only affects the stability and efficiency of PV power generation but may also exacerbate fatigue damage to the modules and supports, shortening their lifespan. More seriously, severe vibrations may cause modules to detach or the structure to become unstable, posing potential safety hazards to the aquaculture facilities below and the surrounding environment.

[0004] Currently, common solutions to the problem of large vibrations in flexible photovoltaic modules under high wind conditions mainly include:

[0005] (1) Increase the stiffness of the support: improve the wind resistance by strengthening the support structure, but this method will significantly increase the material cost.

[0006] (2) Adding counterweight: Adding counterweight to the support to suppress displacement; however, this method will significantly increase the overall weight, thereby weakening the advantage of lightweight flexible photovoltaic modules.

[0007] (3) Optimize the layout of the components: Reduce the impact of wind load by adjusting the arrangement of photovoltaic components.

[0008] While these methods have alleviated the displacement problem of flexible photovoltaics to some extent, they often come at the cost of sacrificing the advantages of flexible photovoltaics in terms of lightweighting and low cost, making it difficult to balance the contradiction between lightweighting and wind resistance. Summary of the Invention

[0009] To address the above problems, this invention provides a wind-resistant photovoltaic support structure that integrates fishing and solar power, and a weakly coupled numerical simulation method thereof.

[0010] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0011] A wind-resistant photovoltaic support structure for fishpond integration includes flexible cables spanning above a fishpond and uprights positioned at the edge of the fishpond. The flexible cables consist of two or more parallel cables used to support photovoltaic modules. Adjacent flexible cables are connected by rigid support rods. The middle part of the support rod is hinged 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 and is connected to an underwater damping structure.

[0012] 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, with the top of the multiple branch rods connected to the lower end of the vertical rod, and the ends of the multiple branch rods connected to the four edges of the damping net. The porosity of the damping net is 20%.

[0013] Furthermore, the upper end of the vertical rod is connected to the support rod via a hinge joint. The hinge joint includes a spherical 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 disposed inside the connecting seat. 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.

[0014] Furthermore, the vertical rod is capable of swinging within 45°; an elastic bushing is filled between the connecting seat and the ball head.

[0015] Furthermore, the branch rod is connected to the damping mesh via a quick-release buckle.

[0016] Furthermore, there are 3 to 5 branch rods, and the included angle between two adjacent branch rods is 120° to 150°.

[0017] Furthermore, the support rod and vertical rod are made of carbon fiber or glass fiber reinforced plastic; the connecting seat and ball head are both made of stainless steel.

[0018] Furthermore, the damping mesh is made of high-strength nylon or polyester fiber, and the surface of the damping mesh is coated with an anti-corrosion coating.

[0019] Furthermore, the size of the damping mesh does not exceed 3 square meters.

[0020] This invention also provides a weakly coupled numerical simulation method for a wind-resistant photovoltaic support structure that integrates fishing and solar power, comprising the following steps:

[0021] Step 1: Collect the actual dimensions of the above-mentioned wind-resistant photovoltaic support structure for fishery-solar integration;

[0022] Step 2: Use ANSYS APDL software to establish a finite element model of the flexible photovoltaic support, add support rods between adjacent flexible cables at the location where the damping net is placed, apply prestress to the flexible cables, perform static calculations, and adjust the magnitude of the prestress to match the sag-span ratio of the wind-resistant photovoltaic support for fishery-solar integration in actual engineering, and obtain the finite element model of the flexible photovoltaic support and support rods.

[0023] Step 3: Reconstruct the wind pressure coefficient time history data of the photovoltaic modules obtained from the wind tunnel test into the wind-resistant photovoltaic support for fishery-solar integration in the actual project according to the time scale ratio, and multiply it with the basic wind pressure to obtain the wind pressure time history data of each area of ​​the photovoltaic module; divide each photovoltaic module of the finite element model into n parts, corresponding to the area where each of the n measuring points in each column of the test model is located, load the finite element model, and after the calculation is completed, export the vertical displacement change time history data of each node on the flexible cable into a text document;

[0024] Step 4: Use MATLAB to read the vertical displacement time history data U1 and U2 at the mid-span nodes of the two flexible cables, calculate the combined vertical displacement time history U(t) and torsional displacement time history A(t) at the mid-span, and obtain the average value U of the vertical and torsional displacements at the mid-span. m A m and pulsation value U s A s The implementation example of the MATLAB program is as follows:

[0025] U(t) = (U1 + U2) / 2;

[0026] U m =[mean(U(t))]

[0027] U s =[std(U(t))]

[0028] A(t) = (U1 - U2) / d * 180 / 3.14; % d is the horizontal projection distance between the two cables.

[0029] A m =[mean(A(t))]

[0030] A s =[std(A(t))]

[0031] Step 5: In the Space Claim software, first draw the water area, label the upper surface as "output" and the other surfaces as "wall"; then open the Space Claim software again, draw the shape of the damping net, label it "wang", and create a cuboid damping region that wraps around the damping net, labeling the surface as "neibumian".

[0032] Step 6: In ANSYS APDL software, open the Mesh module, import the geometric model of the water area, change all growth rates to 1.1, and leave other parameters at their default settings to generate a volume mesh; open the damped region, change all growth rates to 1.1, apply local mesh refinement to the boundary region of the damped mesh, leave other parameters at their default settings to generate a volume mesh;

[0033] Step 7: Write a user-defined function udf to store the vertical displacement time history data calculated in ANSYS APDL software in the form of a static array in the udf, and implement dynamic boundary condition mapping through the CG_MOTION macro;

[0034] Step 8: Open the Solution module in ANSYS Fluent software, import the volumetric mesh of the water area, and import the volumetric mesh of the damping part as an additional part; adjust the fluid material to liquid water and air, select the volumetric fluid method (vof) for multiphase flow, select the k-epsilon model for viscous model, adjust the interface of the overlapping mesh, adjust the dynamic mesh parameters, output the average pressure of the "wang" surface, and then start the calculation.

[0035] Step 9: 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 support rod, and at the same time 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.

[0036] Repeat step four to calculate the average vertical and torsional displacements U at the mid-span position after the damping net is installed. m A m and pulsation value U s A s ;

[0037] Step 10: Compare the changes in the average and pulsating values ​​of vertical and torsional displacements at the mid-span position before and after the installation of the damping net to determine the vibration suppression effect of the damping net.

[0038] The technological advancements achieved by this invention compared to existing technologies are as follows:

[0039] 1. This invention adopts a composite wind-resistant structure of "underwater damping structure + flexible hinge". The wind-induced vibration is transmitted to the underwater damping net through the support rod, and the water resistance is used to suppress the large vibration of the photovoltaic support.

[0040] 2. The support rods made of carbon fiber or glass fiber and the high-strength polymer damping mesh greatly reduce the overall weight, while fully retaining the characteristics of flexible photovoltaics: lightweight, easy to install, and adaptable to complex terrain.

[0041] 3. The underwater damping net uses environmentally friendly materials, which do not affect the aquatic ecosystem and maintain the natural state of the water area. This synergistic design concept of "photovoltaics + ecology" enables the project to generate electricity while taking into account ecological environmental protection, which is in line with the development trend of modern green energy and has significant social benefits and environmental value.

[0042] 4. This invention employs a weakly coupled numerical simulation method to perform step-by-step coupled calculations of wind load, support vibration, and water resistance effects. By mapping wind tunnel test data to the surface of photovoltaic modules in partitions, non-uniform wind pressure distribution is accurately simulated; simultaneously, dynamic mesh technology is used to capture the fluid-structure interaction process of 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 the interaction of key physical fields. Attached Figure Description

[0043] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used together with the embodiments of the invention to explain the invention and do not constitute a limitation thereof.

[0044] In the attached diagram:

[0045] Figure 1 This is a schematic diagram of a wind-resistant photovoltaic support structure for fishery-solar integration provided in an embodiment of the present invention;

[0046] 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;

[0047] Figure 3 This is a schematic diagram of the underwater damping structure in an embodiment of the present invention;

[0048] Figure 4 This is a cross-sectional schematic diagram of the hinge joint in an embodiment of the present invention;

[0049] Figure 5 This is a schematic diagram illustrating the working principle of the present invention;

[0050] Figure 6 This is a finite element model diagram of the present invention;

[0051] Figure 7 This is a schematic diagram of the finite element method for dividing the damping region in this invention;

[0052] Figure 8 This is a comparison chart of the displacement time history of the present invention (blue indicates before adding the damping mesh, orange indicates after adding the damping mesh).

[0053] In the diagram: 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 Implementation

[0054] The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described again in some embodiments. The embodiments of the present invention will now be described with reference to the accompanying drawings.

[0055] like Figure 1 , Figure 2 As shown, a wind-resistant photovoltaic support system for fishpond integration includes flexible cables 3 spanning above a fishpond and uprights positioned at the edge of the fishpond. Two or more flexible cables 3 are arranged side-by-side to support photovoltaic modules 2. Adjacent flexible cables 3 are connected by rigid support rods 1. The middle of the support rod 1 is hinged to the upper end of a rigid vertical rod 4. The lower end of the vertical rod 4 extends 1-1.5m below the water surface and is connected to an underwater damping structure. Figure 3 As shown, the underwater damping structure includes a flexible damping net 7 and multiple rigid branch rods 6. The branch rods 6 are arranged in an umbrella shape, with their tops connected to the lower ends of the vertical rod 4. The ends of the branch rods 6 are connected to the perimeter 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 support structure shifts, and the support rod 1 drives the damping net 7 below to move. When the damping net 7 moves underwater, it generates resistance in the opposite direction of movement, which is transmitted to the photovoltaic support structure by the support rod 1, thereby suppressing the vibration of the photovoltaic support structure.

[0056] 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 connecting seat and a ball head. The outer wall of the connecting seat is fixed to the bottom surface of the support rod 1. The ball head is disposed inside 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. An elastic bushing 9 is filled between the connecting seat and the ball head. The elastic bushing is made of highly elastic rubber, which absorbs high-frequency micro-vibrations and reduces metal fatigue.

[0057] In specific manufacturing, there are 3 to 5 branch rods 6, with the included angle between two adjacent branch rods 6 being 120° to 150°. The support rod 1 and the vertical rod 4 are made of carbon fiber or glass fiber reinforced plastic, combining lightweight and high strength. Meanwhile, the connecting seat and ball joint are both made of stainless steel. The ball joint at the upper end of the vertical rod is inserted into the connecting seat and fixed by a locking ring, and the hinge allows the vertical rod to swing within 45°.

[0058] In addition, the damping mesh 7 is made of high-strength nylon or polyester fiber and coated with an anti-corrosion coating. The high-strength nylon can be nylon 6 / 6 (polyamide 66), nylon 12, or nylon 66 reinforced materials. The damping mesh 7 is connected to the branch rod 6 via quick-release buckles 8, allowing for tension adjustment.

[0059] To further optimize the above scheme, the size of the damping net 7 shall not exceed 3 square meters.

[0060] This invention also provides a weakly coupled numerical simulation method for a wind-resistant photovoltaic support structure that integrates fishing and solar power, comprising the following steps:

[0061] Step 1: Collect the actual dimensions of the above-mentioned wind-resistant photovoltaic support structure for fishery-solar integration;

[0062] Actual dimensions include: height of flexible cable above ground, span L, sag d, tilt angle β, spacing between photovoltaic modules, number of spans, number of rows, material properties of flexible photovoltaic support, cross-sectional area, etc.

[0063] Step 2: Use ANSYS APDL software to establish a finite element model of the flexible photovoltaic support. Add support rods between adjacent flexible cables at the location where the damping net is placed. Apply prestress to the flexible cables, perform static calculations, and adjust the magnitude of the prestress to match the sag-span ratio of the wind-resistant photovoltaic support for fishery-solar integration in actual engineering. This will result in a finite element model of the flexible photovoltaic support and support rods.

[0064] Step 3: Reconstruct the wind pressure coefficient time history data of the photovoltaic modules obtained from the wind tunnel test into the wind-resistant photovoltaic support for fishery-solar integration in the actual project according to the time scale ratio, and multiply it with the basic wind pressure to obtain the wind pressure time history data of each area of ​​the photovoltaic module; divide each photovoltaic module of the finite element model into n parts, corresponding to the area where each of the n measuring points in each column of the test model is located, load the finite element model, and after the calculation is completed, export the vertical displacement change time history data of each node on the flexible cable into a text document;

[0065] Step 4: Determine the combined vertical displacement time history and torsional displacement time history at the mid-span position using the vertical displacement time history data of the nodes at the mid-span of the two flexible cables. Calculate the average value and pulsation value of the vertical and torsional displacements at the mid-span position.

[0066] Step 5: In the Space Claim software, first draw the water area, label the upper surface as "output" and the other surfaces as "wall"; then open the Space Claim software again, draw the shape of the damping net, label it "wang", and create a cuboid damping region that wraps around the damping net, labeling the surface as "neibumian".

[0067] Step 6: In ANSYS Fluent software, open the Mesh module, import the geometric model of the water area, change all growth rates to 1.1, and leave other parameters at their default settings to generate a volume mesh; open the damped region, change all growth rates to 1.1, apply local mesh refinement to the boundary region of the damped mesh, and leave other parameters at their default settings to generate a volume mesh;

[0068] Step 7: Write a user-defined function UDF to store the vertical displacement time history data calculated by ANSYS APDL software in the form of a static array in the UDF, and implement dynamic boundary condition mapping through the CG_MOTION macro;

[0069] Step 8: Open the Solution module in ANSYS Fluent software, import the volumetric mesh of the water area, and import the volumetric mesh of the damping part as an additional part; adjust the fluid material to liquid water and air, select the volumetric fluid method (vof) for multiphase flow, select the k-epsilon model for viscous model, adjust the interface of the overlapping mesh, adjust the dynamic mesh parameters, output the average pressure of the "wang" surface, and then start the calculation.

[0070] Step 9: Apply the resistance time history data obtained from the underwater motion of the damping network obtained from the Solution module of ANSYS Fluent software to the support rod, and at the same time 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.

[0071] Repeat step four to calculate the average vertical and torsional displacements U at the mid-span position after the damping net is installed. m A m and pulsation value U s A s ;

[0072] Step 10: Compare the changes in the average vertical and torsional displacements at the mid-span position before and after the damping net is installed to determine the vibration suppression effect of the underwater damping structure.

[0073] The above solution will be explained and illustrated through a specific embodiment below.

[0074] 1) Taking a flexible photovoltaic (PV) engineering project as the research background, this project is a single-row, single-span structure with a span of L=19.9m, a height of 2.5m, a sag-to-span ratio of L / 200, a tilt angle of 25°, and module dimensions of 2.278m*1.134m*0.03m. The distance between two adjacent PV modules is 0.04m, and the distance between two flexible cables is 1.4m. Support rods, vertical rods, and underwater damping nets are erected at the mid-span of this flexible PV support structure. Node coordinates and elements are created, and finite element modeling is performed based on the above information, material properties, and cross-sectional area. The applied prestress is adjusted to achieve a sag-to-span ratio of L / 200. At this point, the prestress of the flexible cable on the windward side is 19.1KN, and the prestress of the other flexible cable is 22.7KN.

[0075] 2) During finite element modeling, the photovoltaic module was divided into six parts. Wind load time histories with a basic wind pressure of 0.5 were applied to each of these six parts. The wind load time histories were obtained by multiplying the wind pressure coefficient time history (obtained from a rigid pressure measurement experiment of the flexible photovoltaic support) with the basic wind pressure. The calculation was performed under a wind direction angle of 0°. Large deformation and stress stiffening effects were enabled in the calculation. The total calculation time was 100 seconds, and a variable step size solution strategy was adopted. The baseline load step size was set to 0.001 seconds, and the dynamic adjustment range of the time step size was set to 0.0001 to 0.002 seconds. An adaptive time step size control module was enabled, outputting a result every 20 load steps. The vertical displacement time history of the mid-span node was obtained through the above settings.

[0076] 3) Import the mid-span displacement time history file into a MATLAB file and convert it into the average and fluctuating values ​​of vertical and torsional displacements. The calculated average and fluctuating values ​​of the vertical displacement at a 0° wind angle are -0.254m and 0.058m, respectively, and the wind vibration coefficient is 1.571.

[0077] 4) In Space Claim software, first draw an 11m*11m*8m water area, labeling the top surface as "output" and the other surfaces as "wall". Reopen the software and create a 3m*3m*2m cuboid damping region, labeling its surface as "neibumian". Within the damping region, draw a circle with a diameter of 1m, a porosity of 20%, and a stretching thickness of 2mm, labeling it "wang".

[0078] 5) In ANSYS Fluent software, open the Mesh module, import the geometric model of the water area, change all growth rates to 1.1, and leave other settings at their defaults to generate a volume mesh. Open the damped region, add a local dimension, select "wang", adjust the growth rate to 1.1, and ensure the target mesh size matches the thickness of "wang". Generate a surface mesh with a minimum size of 0.002m and a maximum size of 0.04m, adjusting the growth rate to 1.1, and apply proximity detection to the face. Describe the geometry, adjusting the geometry type to consist only of fluid regions without voids. When updating the boundary, change "neibumian" to "internal". When updating the region, change the "wang" region to "dead" and the remaining 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 "selected-labels" for growth. Generate a volume mesh, selecting poly-hexcore to fill the area, with 4 buffer layers and a minimum element length of 0.002m. Complete the mesh generation.

[0079] 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, it is shown again with 5 data points):

[0080] #include "udf.h"

[0081] #define NUM_POINTS 5 / / Number of data points

[0082] static real time_data[NUM_POINTS] = {0.00, 0.02, 0.04, 0.06, 0.08}; / / Time series

[0083] static real displacement_data[NUM_POINTS] = {0.00, -0.01, -0.03, -0.07, -0.12}; / / Time history data of vertical displacement changes

[0084] DEFINE_CG_MOTION(velocity, dt, vel, omega, time, dtime) {

[0085] for (int i = 0; i < NUM_POINTS - 1; i++) {

[0086] if (time >= time_data[i] && time < time_data[i+1]) {

[0087] vel[2] = (displacement_data[i+1] - displacement_data[i]) / (time_data[i+1] - time_data[i]); / / Calculate the segmented velocity

[0088] break

[0089] }

[0090] }

[0091] }

[0092] Open the Solution module in ANSYS Fluent software, import the volume mesh for the water area, and add the damped portion as an additional volume mesh. Modify the fluid material to liquid water and air, select Vof for multiphase flow, check implicit volume forces, select k-epsilon for the viscous model, and set the overlapping mesh interface. Compile the UDF, select smoothing and mesh reconstruction as the dynamic meshing method, 6 degrees of freedom, adjust the dynamic mesh parameters, set the output to "wang" for the average surface pressure, and then start the calculation.

[0093] 8) Apply the resistance time history data obtained from the underwater motion of the damping network obtained from the Solution module of ANSYS Fluent software to the supporting rigid rod, and at the same time apply the wind load to the photovoltaic module. Calculate the vertical displacement of each node over a period of 100 seconds.

[0094] Repeat step four to calculate the average and pulsation values ​​of the vertical displacement at 0° wind direction angle after the damping net is installed: -0.257m and 0.037m, respectively, with a wind vibration coefficient of 1.36. By comparison, the average vertical displacement at the mid-span position before and after the damping net is installed remains almost unchanged, but the pulsation value is reduced by 36.2%, and the wind vibration coefficient is reduced by 13.4%, demonstrating a significant vibration suppression effect.

[0095] In summary, the present invention has the following advantages:

[0096] 1. This invention employs a composite wind-resistant structure combining an underwater damping structure and flexible hinges. Rigid support rods transmit wind-induced vibrations to an underwater mesh-like damping network, utilizing water resistance to suppress large-amplitude vibrations of the photovoltaic support structure. The hinges not only incorporate highly elastic rubber bushings to absorb high-frequency micro-vibrations but also allow the structure to adaptively sway with wind and water flow. This dual vibration suppression mechanism effectively inhibits large-amplitude vibrations of the support structure, preventing photovoltaic module detachment and structural fatigue damage.

[0097] 2. The device uses rigid support rods made of carbon fiber or glass fiber and damping nets made of high-strength polymer, greatly reducing the overall weight while fully retaining the characteristics of flexible photovoltaics: lightweight, easy to install, and adaptable to complex terrain. The quick-release buckle ensures convenient installation and facilitates later maintenance and replacement, truly achieving a technological breakthrough of "vibration control with lightness."

[0098] 3. The underwater damping structure uses environmentally friendly materials, and the mesh structure does not affect the aquatic ecosystem, maintaining the natural state of the water area. This synergistic design concept of "photovoltaics + ecology" allows the project to generate electricity while taking into account ecological environmental protection, which is in line with the development trend of modern green energy and has significant social benefits and environmental value.

[0099] 4. This invention employs a weakly coupled numerical simulation method to perform step-by-step coupled calculations of wind load, support vibration, and water resistance effects. By mapping wind tunnel test data to the surface of photovoltaic modules in partitions, non-uniform wind pressure distribution is accurately simulated; simultaneously, dynamic mesh technology is used to capture the fluid-structure interaction process of 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 the interaction of key physical fields.

[0100] 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 foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. 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 claims of the present invention.

Claims

1. A wind-resistant photovoltaic support system for fishery-solar integration, characterized in that: It includes a flexible cable spanning across the fishpond and a column set at the edge of the fishpond. The flexible cable consists of two or more parallel cables used to support photovoltaic modules. Adjacent flexible cables are connected by a rigid support rod. The middle part of the support rod is hinged to the upper end of a rigid vertical rod. The lower end of the vertical rod extends 1 to 1.5m below the water surface and is connected to an underwater damping structure. The underwater damping structure includes a flexible damping net and multiple rigid branch rods. The branch rods are arranged in an umbrella shape, with their tops connected to the bottom of a vertical rod and their ends connected to the four edges of the damping net. The damping net has a porosity of 20%. There are 3 to 5 branch rods, and the angle between two adjacent branch rods is 120° to 150°. The size of the damping net does not exceed 3 square meters. The upper end of the vertical rod is connected to the support rod via a hinge joint. The hinge joint includes a spherical connecting seat and a ball head. The outer wall of the connecting seat is fixed to the bottom surface of the support rod. The ball head is disposed inside 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. The vertical rod can swing within 45°; an elastic bushing is filled between the connecting seat and the ball head; After the damping net was installed, the pulsation value at the mid-span of the two flexible cables decreased by 36.2%, and the wind vibration coefficient decreased by 13.4%.

2. The wind-resistant photovoltaic support structure for fishery-solar integration according to claim 1, characterized in that: The branch rod is connected to the damping mesh via a quick-release buckle.

3. The wind-resistant photovoltaic support structure for fishery-solar integration according to claim 1, characterized in that: The support rod and vertical rod are made of carbon fiber or glass fiber reinforced plastic; the connecting seat and ball head are made of stainless steel.

4. The wind-resistant photovoltaic support structure for fishery-solar integration according to claim 1, characterized in that: The damping mesh is made of high-strength nylon or polyester fiber, and the surface of the damping mesh is coated with an anti-corrosion coating.

5. A weakly coupled numerical simulation method for a solar-fishery complementary wind-resistant photovoltaic support system, characterized in that, Includes the following steps: Step 1: Collect the actual dimensions of the wind-resistant photovoltaic support structure for fishery-solar integration as described in any one of claims 1-4; Step 2: Use ANSYS APDL software to establish a finite element model of the flexible photovoltaic support, add support rods between adjacent flexible cables at the location where the damping net is placed, apply prestress to the flexible cables, perform static calculations, and adjust the magnitude of the prestress to match the sag-span ratio of the wind-resistant photovoltaic support for fishery-solar integration in actual engineering, and obtain the 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 of the fishery-solar complementary project according to the time scale ratio, and multiplied with the basic wind pressure to obtain the wind pressure time history data of each area of ​​the photovoltaic module; each photovoltaic module of the finite element model is divided into n parts, corresponding to the area of ​​each column of n measuring points in the test model, and 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 is exported. Step 4: Determine the combined vertical displacement time history and torsional displacement time history at the mid-span position using the vertical displacement time history data of the nodes at the mid-span of the two flexible cables. Calculate the average value and pulsation value of the vertical and torsional displacements at the mid-span position. Step 5: In the Space Claim software, first draw the water area, label the upper surface as "output" and the other surfaces as "wall"; then open the Space Claim software again, draw the shape of the damping net, label it "wang", and create a cuboid damping region that wraps around the damping net, labeling the surface as "neibumian". Step 6: Open the Mesh module in ANSYS APDL software, import the geometric model of the water area, change all growth rates to 1.1, and leave other parameters at their default settings to generate a volume mesh; Open the damping region section, change all growth rates to 1.1, apply local mesh refinement to the boundary region of the damping mesh, leave other parameters at default settings, and 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 form of a static array in the udf, and implement dynamic boundary condition mapping through the CG_MOTION macro; Step 8: Open the Solution module in ANSYS Fluent software, import the volumetric mesh of the water area, and import the volumetric mesh of the damping part as an additional part; adjust the fluid material to liquid water and air, select the volumetric fluid method (vof) for multiphase flow, select the k-epsilon model for viscous model, adjust the interface of overlapping meshes, adjust the dynamic mesh parameters, output the average pressure of the "wang" surface, and then start the calculation. Step 9: Apply the time history data of the resistance generated by the underwater motion of the damping net obtained in the Solution module of ANSYS Fluent software to the support rod, and at the same time 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 four 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 pulsating values ​​of vertical and torsional displacements 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