Floating body for solar power generation system and solar power generation system

Abstract

We provide a floating body for a solar power generation system and a solar power generation system. [Solution] The floating body for a solar power generation system according to the present invention includes an upper structure including an installation portion having a flat shape on one side, a lower structure arranged corresponding to the upper structure and having a downwardly convex hemispherical shape, and a fixing portion that connects the upper structure and the lower structure.

Description

[Technical Field]

[0001] The present invention relates to a floating body for a photovoltaic power generation system and a photovoltaic power generation system. [Background technology]

[0002] In general, floating marine solar power generation systems have the advantages of being suitable for deep waters, not affected by the ground, being portable and reusable, being relatively economical, being quick to install, and having low construction costs depending on the water depth, as opposed to land or freshwater systems.

[0003] However, unlike freshwater environments, the stability and robustness of marine solar power generation systems are significantly affected by the sea level of the ocean area in which they are installed, so factors such as wave direction, wave height, and tidal currents must be taken into consideration when determining the installation location and direction.

[0004] In particular, due to large fluctuations in physical energy caused by sea breezes, including typhoons, and tidal currents, the entire floating marine solar power generation system or parts thereof frequently move from side to side or up and down, increasing the cyclic fatigue load on the solar panel module support structure and mooring devices, thereby reducing the lifespan of the marine solar power generation system.

[0005] In addition, marine pollution has occurred due to stagnant ocean currents inside the bottom of the offshore solar power generation system, which is installed over a wide area.

[0006] Furthermore, marine solar power generation systems generally use floating bodies based on plastic materials, which not only raises concerns about environmental hazards but also poses problems such as poor corrosion resistance in seawater environments, making them vulnerable to corrosion.

[0007] Therefore, there is a need for a method to secure a floating body having excellent corrosion resistance, durability and impact resistance that can overcome these problems. Summary of the Invention [Problem to be solved by the invention]

[0008] The present invention provides a floating body for a solar power generation system and a solar power generation system that overcomes concerns about the corrosion resistance limit and environmental hazard of a floating body in a seawater environment, maximizes transmitted waves passing through the floating body, and prevents marine pollution caused by ocean currents stagnating below the solar power generation system. [Means for solving the problem]

[0009] A floating body for a solar power generation system according to one embodiment of the present invention may include an upper structure including a flat installation portion on one side, a lower structure disposed corresponding to the upper structure and including a hemispherical shape that is convex in a direction away from the installation portion, and a fixing portion that connects the upper structure and the lower structure.

[0010] The superstructure may have one of the following shapes: a hemispherical shape, a semi-conical shape, and a semi-ellipsoidal shape.

[0011] The structure may further include an upper flange portion extending in an outward direction of the upper structure, and a lower flange portion disposed corresponding to the upper flange portion and extending in an outward direction of the lower structure.

[0012] The fixing portion can be formed by connecting the upper structure and the lower structure with screws or welding, or by connecting the upper flange portion and the lower flange portion with bolts or welding.

[0013] The upper flange portion may include a first upper groove, and the lower flange portion may include a first lower groove disposed corresponding to the first upper groove.

[0014] A first non-metallic airtight pad may be disposed between the first upper groove and the first lower groove.

[0015] The upper flange portion may include at least one or more second upper grooves outside the first upper groove, and the lower flange portion may include at least one or more second lower grooves arranged corresponding to the second upper grooves.

[0016] A second non-metallic airtight pad may be disposed between the second upper groove and the second lower groove.

[0017] The upper flange portion may include an upper flat portion between the first upper groove and the second upper groove, and the lower flange portion may include a lower flat portion between the first lower groove and the second lower groove and disposed corresponding to the upper flat portion.

[0018] A third non-metallic airtight pad may be disposed between the upper and lower planar portions.

[0019] The material of the first non-metallic airtight pad, the second non-metallic airtight pad, and the third non-metallic airtight pad may be made of silicone.

[0020] The installation section may be provided with a connecting section for connecting one floating body to another floating body adjacent to the one floating body.

[0021] The installation section may include a communication section that communicates with the internal hollow section of the upper structure, and the communication section may be provided with a positive pressure application device for applying positive pressure to the inside of the upper structure.

[0022] The connecting portion can include a first installation hole for installing a positive pressure applying device, and a socket portion for installing a connecting frame for connecting to an adjacent floating body for a solar power generation system.

[0023] A plurality of socket portions may be arranged at set intervals with the connecting portion as a reference.

[0024] The cross-sectional shape of the socket portion may be trapezoidal.

[0025] The socket may include at least one roller portion disposed within the socket for supporting the mooring cable passing through the socket.

[0026] The positive pressure application device may include an injection tube that communicates with the communication part and injects gas for applying positive pressure, a valve cover that is provided on the injection tube and closes the injection tube, and a support that is connected to the installation part and supports the injection tube.

[0027] Air or carbon dioxide (CO2) gas can be injected into the injection tube at a set pressure.

[0028] The upper and lower structures may be made of metallic materials.

[0029] The metallic material may be any one material selected from austenitic, ferritic, and duplex stainless steel.

[0030] The upper structure and the lower structure may include dimples on the surface.

[0031] The height of the upper structure and the lower structure may be set to be smaller than the radius of the upper structure and the lower structure.

[0032] The socket portion may be manufactured from the same metal material as the upper structure and the lower structure.

[0033] Furthermore, a solar power generation system according to an embodiment of the present invention may include the floating body. [Effects of the Invention]

[0034] According to an embodiment of the present invention, a spherical floating body shape can be provided that uses a metal material with excellent corrosion resistance, has excellent durability and impact resistance regardless of the floating body material and the direction of sea breezes and waves, and ensures airtightness.

[0035] Therefore, it is possible to overcome the environmental concerns of plastic-based floating solar power generation systems and the limited corrosion resistance in seawater environments, and by maximizing the transmitted waves that pass through the floating structure, it is possible to prevent marine pollution caused by stagnant ocean currents inside the lower part of the marine solar power generation system that is installed over a wide area. [Brief explanation of the drawings]

[0036] [Figure 1] 1 is a schematic assembly perspective view of a floating body for a solar power generation system according to an embodiment of the present invention; [Figure 2] 1 is a schematic partially exploded perspective view of a floating body for a solar power generation system according to an embodiment of the present invention; [Figure 3] 2A and 2B are cross-sectional views of part A in FIG. 1, in which (a) shows the joined state of the upper flange portion and the lower flange portion according to the first embodiment, and (b) shows the joined state of the upper flange portion and the lower flange portion according to the first embodiment. [Figure 4] 1 is a schematic perspective view of a connecting portion of a floating body for a solar power generation system according to an embodiment of the present invention. [Figure 5] 1A and 1B are cross-sectional views of a connecting portion of a floating body for a solar power generation system according to one embodiment of the present invention, in which (a) shows a trapezoidal cross-sectional shape, (b) shows a square cross-sectional shape, and (c) shows a circular cross-sectional shape. [Figure 6] 1 is a schematic perspective view of a positive pressure application device for a floating body for a solar power generation system according to an embodiment of the present invention. [Figure 7] FIG. 10 is a schematic partially exploded perspective view of a floating body for a solar power generation system according to another embodiment of the present invention. [Figure 8] 1 is a graph comparing the number of floating bodies relative to the immersion volume (immersion rate) of the floating bodies between a comparative example and an example of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0037] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings so that those skilled in the art can easily carry out the present invention. As will be easily understood by those skilled in the art, the following embodiments can be modified in various ways without departing from the concept and scope of the present invention. Whenever possible, the same or similar parts are designated by the same reference numerals in the drawings.

[0038] The terminology used below is merely for the purpose of referring to particular embodiments and is not intended to limit the present invention. As used herein, the singular form includes the plural form unless the context clearly dictates otherwise. The meaning of "comprising" as used in the specification embodies certain properties, regions, integers, steps, operations, elements, components and / or components, and does not exclude the presence or addition of other certain properties, regions, integers, steps, operations, elements, components and / or groups.

[0039] All terms, including technical and scientific terms, used below have the same meaning as commonly understood by a person of ordinary skill in the art to which the present invention belongs. Predefined terms are additionally interpreted to have a meaning consistent with the relevant technical literature and the presently disclosed content, and are not interpreted in an ideal or very formal sense unless otherwise defined.

[0040] FIG. 1 is a schematic perspective view of a floating body for a solar power generation system according to an embodiment of the present invention, and FIG. 2 is a schematic partial exploded perspective view of the floating body for a solar power generation system according to an embodiment of the present invention.

[0041] 3A and 3B are cross-sectional views of part A in FIG. 1, where FIG. 3A shows the joined state of the upper flange portion and the lower flange portion according to the first embodiment, and FIG. 3B shows the joined state of the upper flange portion and the lower flange portion according to the first embodiment.

[0042] FIG. 4 is a schematic perspective view of a connecting portion of a floating body for a solar power generation system according to one embodiment of the present invention, and FIG. 5 is a cross-sectional view of a connecting portion of a floating body for a solar power generation system according to one embodiment of the present invention, where (a) shows a trapezoidal cross-sectional shape, (b) shows a square cross-sectional shape, and (c) shows a circular cross-sectional shape.

[0043] FIG. 6 is a schematic perspective view of a positive pressure applying device for a floating body for a solar power generation system according to one embodiment of the present invention, and FIG. 7 is a schematic partially exploded perspective view of a floating body for a solar power generation system according to another embodiment of the present invention.

[0044] 1 to 7, a floating body 10 for a solar power generation system according to an embodiment of the present invention may include an upper structure 100, a lower structure 200, and a fixing part 300.

[0045] The upper structure 100 may include a flat installation portion 101 on one surface, for example, on the top surface.

[0046] In addition, the lower structure 200 is disposed corresponding to the upper structure 100 and may include a hemispherical shape that is convex downward (Y direction in FIG. 1), that is, in a direction away from the installation portion 101.

[0047] The fixing part 300 can connect and fix the upper structure 100 and the lower structure 200 together.

[0048] The installation portion 101 can refer to a plane obtained by cutting the upper end (vertex) of the upper structure 100 into a plane parallel to the lower end surface of the upper structure 100.

[0049] The upper structure 100 may have one shape selected from a hemispherical shape, a semi-conical shape, a semi-ellipsoidal shape, etc. that is convex upward (Y direction in Figure 1), i.e., in a direction away from the lower structure 200, so that water (seawater) caused by external forces can pass through smoothly.

[0050] The lower structure 200 has a downwardly convex hemispherical shape to allow water (seawater) caused by external forces to pass through smoothly, and is capable of having buoyancy to float on the water, allowing the upper structure 100 placed above the lower structure 200 to float above the water surface.

[0051] The floating body 10 for the solar power generation system has a small resistance to external forces such as wind load and wave load at sea, and can have an overall spherical shape due to the upper structure 100 and the lower structure 200 so that incident waves generate streamlines (transmitted waves) along the surface of the floating body, generating natural radio waves inside the lower part of the floating marine solar power generation system.

[0052] In addition, the upper structure 100 and the lower structure 200 can be made of metal materials, etc., which have excellent corrosion resistance and are highly resistant to surface corrosion and crevice corrosion of the immersed portion of the float.

[0053] As such a metallic material, any one material selected from highly corrosion-resistant austenite, ferrite, duplex stainless steel, and the like can be used.

[0054] The upper structure 100 and the lower structure 200 of the floating body 10 for a solar power generation system can be manufactured by metal press working, which plastically deforms a metal plate.

[0055] The height Rb1 of the upper structure 100 and the height Rb2 of the lower structure 200 may be set to be smaller than the radius Ra of the upper structure 100 and the lower structure 200, taking into consideration the cold workability including the elongation rate of the metal.

[0056] The lower end of the upper structure 100 and the upper end of the lower structure 200 may each have a rounded portion R2 that is rounded in consideration of the cold workability including the elongation rate of the metal in order to prevent cracks from occurring during processing in areas where the shape changes suddenly.

[0057] In addition, the floating body 10 for the solar power generation system may include an upper flange portion 110 extending outward from the upper structure 100, and a lower flange portion 210 arranged corresponding to the upper flange portion 110 and extending outward from the lower structure 200.

[0058] The fixing part 300 may connect the upper structure 100 and the lower structure 200 together, or may connect the upper flange part 110 and the lower flange part 210 together.

[0059] The upper flange portion 110 can extend outward, that is, radially, from the outer peripheral surface of the lower end of the upper structure 100 .

[0060] In addition, the lower flange portion 210 can extend outward, that is, radially, from the outer peripheral surface of the upper end of the lower structure 200 .

[0061] The fixing part 300 can fix the upper structure 100 and the lower structure 200 by connecting an upper screw line (not shown) arranged inside or outside the lower end of the upper structure 100 to a lower screw line (not shown) arranged inside or outside the upper end of the lower structure 200 corresponding to the upper screw line, or by welding.

[0062] The fixing part 300 may include a fastening bolt 310 for fastening the upper flange part 110 and the lower flange part 210 together, a nut 320 for fastening to the fastening bolt 310, and the like.

[0063] A plurality of fastening bolts 310 may be fastened to the upper flange portion 110 and the lower flange portion 210 at set intervals in order to firmly fasten the upper flange portion 110 and the lower flange portion 210 together.

[0064] The upper flange portion 110 may be provided with an upper fastening hole 111 for inserting and fastening the fastening bolt 310, and the lower flange portion 210 may be provided with a lower fastening hole 211 arranged corresponding to the upper fastening hole 111 for inserting and fastening the fastening bolt 310.

[0065] In addition, the upper connecting holes 111 may be arranged at set intervals along the circumferential surface of the upper flange portion 110 on a set radius (R5, in this case, R5>Ra) centered on the lower end center O1 of the upper structure 100.

[0066] The lower coupling holes 211 may be arranged at set intervals along the circumferential surface of the lower flange portion 210 on a radius (R5, in this case, R5>Ra) of a set size centered on the upper end center O2 of the lower structure 200.

[0067] Furthermore, it goes without saying that the fixing portion 300 may be fixed by welding the outer surface of the upper flange portion 110 and the outer surface of the lower flange portion 210 together, without using the fastening bolts 310 and nuts 320 .

[0068] The upper flange portion 110 may include a first upper groove 113 that is convex upward, and the lower flange portion 210 may include a first lower groove 213 that is concave downward and disposed corresponding to the first upper groove 113.

[0069] A first non-metallic airtight pad 400 may be disposed between the first upper groove 113 and the first lower groove 213 .

[0070] Additionally, the upper flange portion 110 may bulge upward and include at least one or more second upper grooves 115 outside the first upper groove 113 .

[0071] The lower flange portion 210 may include a second lower groove 215 that is recessed downward and positioned to correspond to the second upper groove 115 .

[0072] A second non-metallic airtight pad 410 may be disposed between the second upper groove 115 and the second lower groove 215 .

[0073] In addition, the first upper groove 113 and the second upper groove 115 may be arranged at a set interval along the circumferential surface of the upper flange portion 110 on a set radius (R6, in this case, R5>R6>Ra) centered on the lower end center O1 of the upper structure 100.

[0074] The first lower groove 213 and the second lower groove 215 may be arranged at set intervals along the circumferential surface of the lower flange portion 210 on a set radius (R6, in this case, R5>R6>Ra) centered on the upper end center O2 of the lower structure 200.

[0075] The upper flange portion 110 may include an upper flat portion 117 between the first upper groove 113 and the second upper groove 115, and the lower flange portion 210 may include a lower flat portion 217 disposed corresponding to the upper flat portion 117 between the first lower groove 213 and the second lower groove 215.

[0076] A third non-metallic airtight pad 420 may be disposed between the upper planar portion 117 and the lower planar portion 217 .

[0077] In addition, the thickness (2t+h) of the third non-metallic airtight pad 420 may be set to be thicker than the sum of the thicknesses (2t) of the upper flange portion 110 and the lower flange portion 210, and thinner than the thickness of the first non-metallic airtight pad 400.

[0078] The material of the first non-metallic airtight pad 400, the second non-metallic airtight pad 410, and the third non-metallic airtight pad 420 may be made of silicone or the like.

[0079] The installation section 101 may be provided with a connecting section 500 for connecting one floating body 10 to another floating body 10 adjacent to the one floating body 10.

[0080] The upper structure 100 includes an internal open cavity (not shown), and the lower structure 200 may include an internal open cavity (not shown).

[0081] In addition, a low-density filler such as styrofoam can be inserted into each hollow portion (not shown) of the upper structure 100 and the lower structure 200 to allow the upper structure 100 and the lower structure 200 to float well on water, and oxygen or carbon dioxide can be injected into the gaps between these fillers.

[0082] The central part of the installation section 101 includes a communication section 103 that communicates with the internal hollow section of the upper structure 100, and the communication section 103 may be provided with a positive pressure application device 600 for applying positive pressure to the inside of the upper structure 100.

[0083] The installation portion 101 has a radius R3 of a set size centered on the center of the communication portion 103, and the communication portion 103 can have a radius R4 of a set size.

[0084] The connecting portion 500 is arranged at its lower end and may include a first installation hole 510 for installing a positive pressure application device 600, and a socket portion 520 for inserting and installing a connecting frame 530 for connecting to an adjacent floating body 10 for a solar power generation system.

[0085] A plurality of socket units 520 may be arranged at set intervals based on the center of the connecting unit 500. Although Fig. 4 shows four socket units 520 arranged at 90-degree intervals around the center of the connecting unit 500, the number is not limited to this, and it goes without saying that four or more socket units may be arranged as needed.

[0086] The connecting part 500 may also include a second installation hole 511 disposed at its upper end, communicating with the first installation hole 510, and into which the positive pressure applying device 600 is inserted and installed.

[0087] The first mounting hole 510 may have a smaller diameter than the second mounting hole 511 in order to facilitate application of positive pressure to the positive pressure applying device 600 .

[0088] The cross-sectional shape of the socket part 520 has a thickness t set to match the shape of the connection frame 530, and may be trapezoidal, rectangular, circular, or the like.

[0089] The socket portion 520 can be manufactured by welding or the like using the same metal material as the upper structure 100 and the lower structure 200 .

[0090] When the cross-sectional shape of the socket portion 520 is trapezoidal or rectangular, the bent surface of the socket portion 520 may have a round Rf having a set curvature in consideration of the cold workability including the elongation rate of the metal so as to prevent cracks from occurring due to excessive bending.

[0091] Additionally, the socket portion 520 of the connecting portion 500 may include at least one or more roller portions 550 inside for supporting the mooring cable 540 passing through the socket portion 520 .

[0092] A roller support 551 may be provided on the inner surface of the socket portion 520 to support the roller portion 550 so that it can rotate arbitrarily.

[0093] The positive pressure applying device 600 may include an injection tube 610 , a valve cover 620 , and a support 630 .

[0094] The injection pipe 610 is provided in communication with the communication part 103 and can inject gas for applying positive pressure.

[0095] In addition, a valve cover 620 is provided at the upper end of the injection tube 610 to close the injection tube 610 .

[0096] The support 630 can be coupled to the installation portion 101 to support the injection tube 610 .

[0097] The positive pressure application device 600 may be, for example, a snap-in valve, and by periodically checking the positive pressure inside the positive pressure application device 600 using this positive pressure application device 600, it is possible to quantitatively monitor the state of the floating body 10 for the solar power generation system for the presence or absence of damage and corrosion, and it is possible to ensure airtightness by applying additional positive pressure.

[0098] Air or carbon dioxide (CO2) gas can be injected into the injection pipe 610 of the positive pressure applying device 600 at a set pressure (for example, a pressure higher than atmospheric pressure).

[0099] In particular, when carbon dioxide is injected into the injection pipe 610 to pressurize the inside of the superstructure 100, the speed of internal corrosion that may occur due to crevice corrosion in the solar power generation system float 10 and the reaction between chlorine ions in the incoming seawater and oxygen can be significantly delayed.

[0100] In addition, the injection pipe 610 is provided with a pressure gauge (not shown) for measuring the pressure inside the injection pipe 610, and this pressure gauge may be provided with an alarm unit (not shown) that receives pressure information measured by the pressure gauge and notifies an operator or the like when the measured pressure is reduced to a pressure below a set level.

[0101] The floating body 10 for the photovoltaic power generation system may be provided with a step or a walkway (not shown) for maintenance and safety inspection of the floating body 10.

[0102] As shown in FIG. 7, the upper structure 100 and the lower structure 200 may include a plurality of dimples 120, 220 for generating turbulence on the surface.

[0103] The dimples 120, 220 can be formed by press working or the like so that turbulence is generated on the surfaces of the upper structure 100 and the lower structure 200.

[0104] The dimple portions 120, 220 generate turbulence on the surfaces of the upper structure 100 and the lower structure 200, thereby reducing the area where wakes are generated by tidal currents and sea breezes flowing along the floating body for a solar power generation system 10, thereby reducing the pressure drag acting on the floating body for a solar power generation system 10 and minimizing the attachment of marine organisms.

[0105] Furthermore, a solar power generation system according to an embodiment of the present invention may include the floating body described above.

[0106] Hereinafter, the operation of the floating body for a photovoltaic power generation system according to one embodiment of the present invention will be described with reference to FIGS.

[0107] First, the floating body 10 for a solar power generation system has an overall spherical shape due to the upper structure 100 and the lower structure 200 .

[0108] As a result, there is little resistance to external forces such as wind load and wave load on the sea, where it is not known which direction the sea breeze will blow or the tide will flow, and incident waves generate streamlines (transmitted waves) along the surface of the floating body 10 for the solar power generation system, allowing natural radio waves to be generated inside the bottom of the floating marine solar power generation system.

[0109] The resistance force (Fd) generated on the floating body 10 for a solar power generation system may be expressed as the velocity (V) of the wind or current acting on the floating body, the projected cross-sectional area (A) of the fluid in the flow direction, the density (ρ) of the fluid, and the drag coefficient (Cd) related to the projected cross-sectional shape of the floating body, as shown in Equation (1). Fd=ρAV 2 Cd / 2---Formula (1)

[0110] It is known that if the projected cross-sectional area (A) in the direction of fluid flow is the same, the magnitude of the resistance force (Fd) is determined according to the drag coefficient (Cd) related to the projected cross-sectional shape of the floating body; for a rectangle, Cd is 0.82; for a vertical flat plate, Cd is 1.2; for a long cylinder, Cd is 0.82; for a short cylinder, Cd is 1.15; and for a sphere, Cd is 0.47.

[0111] Therefore, the shapes of the floating bodies used in the comparative examples are plate-shaped, square-shaped, conical, or cylindrical, and the drag coefficient varies depending on the direction of the current, and the value is also larger than that of the sphere presented in the examples of the present invention.

[0112] Furthermore, since the upper structure 100 has a hemispherical shape that is convex upward (Y direction in FIG. 1), seawater (water) caused by an external force can pass through smoothly.

[0113] In addition, the lower structure 200 has a hemispherical shape convex downward (Y direction in Figure 1) and has buoyancy, allowing seawater caused by external forces to pass through smoothly and allowing the upper structure 100 placed above the lower structure 200 to float above the water surface.

[0114] In addition, since the upper structure 100 and the lower structure 200 are manufactured by metal pressing, which plastically deforms a metal plate, they can have excellent corrosion resistance, which is strong against surface corrosion and crevice corrosion of the immersed part of the floating body 10.

[0115] The floating body 10 for the solar power generation system includes an upper flange portion 110 extending outward from the upper structure 100, a lower flange portion 210 extending outward from the lower structure 200, and a fixing portion 300 connecting the upper flange portion 110 and the lower flange portion 210.

[0116] In addition, the upper flange portion 110 includes a first upper groove 113 that is convex upward, and the lower flange portion 210 includes a first lower groove 213 that is concave downward and is arranged corresponding to the first upper groove 113, and a first non-metallic airtight pad 400 is arranged between the first upper groove 113 and the first lower groove 213.

[0117] In addition, the upper flange portion 110 includes a second upper groove 115 outside the first upper groove 113, and the lower flange portion 210 includes a second lower groove 215 arranged corresponding to the first lower groove 213, and a second non-metallic airtight pad 410 may be arranged between the second upper groove 115 and the second lower groove 215.

[0118] The upper flange portion 110 includes an upper flat portion 117 between the first upper groove 113 and the second upper groove 115, and the lower flange portion 210 includes a lower flat portion 217 disposed corresponding to the upper flat portion 117 between the first lower groove 213 and the second lower groove 215.

[0119] In addition, a third non-metallic airtight pad 420 is disposed between the upper flat portion 117 and the lower flat portion 217 .

[0120] By including the related configuration of the upper flange portion 110, the lower flange portion 210 and the fixing portion 300 in this manner, it is possible to prevent seawater from entering the inside of the floating body 10 for a solar power generation system, which would cause crevice corrosion and loss of buoyancy.

[0121] Furthermore, the installation section 101 of the floating body 10 for the photovoltaic power generation system is provided with a connecting section 500, so that one floating body 10 can be connected to another floating body 10 adjacent to the one floating body 10.

[0122] That is, a plurality of socket parts 520 are arranged at set intervals based on the center of the connecting part 500, and a connecting frame 530 for connecting one floating body 10 to another adjacent floating body 10 can be inserted and installed.

[0123] The cross-sectional shape of the socket portion 520 has a thickness t set to match the shape of the connection frame 530, and may be trapezoidal, rectangular, circular, or the like.

[0124] Furthermore, at least one or more roller portions 550 are provided inside the socket portion 520 of the connecting portion 500, so that the mooring device cable 540 passing through the socket portion 520 can be supported.

[0125] The central part of the installation section 101 includes a communication section 103 that communicates with the internal hollow section of the upper structure 100, and the communication section 103 is provided with a positive pressure application device 600 for applying positive pressure to the inside of the upper structure 100.

[0126] By periodically checking the positive pressure in the positive pressure application device 600 using such a positive pressure application device 600, it is possible to quantitatively monitor the state of the floating body 10 for the solar power generation system for damage and corrosion, and it is possible to ensure airtightness by applying additional positive pressure.

[0127] In particular, when carbon dioxide is injected into the injection pipe 610 to pressurize the inside of the superstructure 100 to a set pressure, the rate of internal corrosion that may occur due to crevice corrosion in the solar power generation system float 10 and the reaction between chlorine ions in the incoming seawater and oxygen can be significantly delayed.

[0128] The positive pressure application device 600 applies gas having a pressure higher than atmospheric pressure to the inside of the superstructure 100, making it possible to easily variably set the buoyancy of the floating body 10 in accordance with fluctuations in sea level, which vary depending on the installation area, and seasonal temperature changes, and can fundamentally prevent seawater, which causes crevice corrosion, from entering the inside of the floating body 10.

[0129] In addition, the upper structure 100 and the lower structure 200 have dimples 120 and 220 on their surfaces, which allows turbulence to be generated on the surfaces of the upper structure 100 and the lower structure 200 .

[0130] In this way, by generating turbulence by the dimples 120, 220 on the surfaces of the upper structure 100 and the lower structure 200, the area where wakes are generated by tidal currents or sea breezes flowing along the floating body for a solar power generation system 10 is reduced, thereby reducing the pressure drag acting on the floating body for a solar power generation system 10 and minimizing the attachment of marine organisms.

[0131] The following description will be made with reference to Figure 8. The immersion ratio of a floating body used below means the ratio of the volume of the floating body immersed below the seawater surface to the total volume of the floating body.

[0132] FIG. 8 is a graph comparing the number of floating bodies relative to the immersion volume (immersion rate) of the floating bodies between the comparative example and the example of the present invention.

[0133] Figure 8 shows a comparison of the number of positive pressure application spherical floats made of high density polyethylene (HDPE) material as a comparative example and the number of positive pressure application spherical floats made of highly corrosion-resistant metal material (Duplex STS) of the present invention, depending on the immersion rate of the floats, when the weight of the solar panels in a 0.1MW floating marine solar power generation system is 5.56 tons (371 panels) and the weight of the structure is 15 tons.

[0134] In addition, the external environment is assumed to be a seawater temperature of 40 degrees, carbon dioxide (CO2) at 1.1 atmospheres (atm), higher than atmospheric pressure, is applied to the inside of the float, and the dimensions of the spherical float are assumed to be a sphere radius Ra of 400 mm and a flange radius width (R7-Ra) of 150 mm on the outside of the sphere (see Figure 2).

[0135] In this case, the number of floating bodies is determined by dividing the sum of the weight of the solar panels and the weight of the structure by the pure buoyancy that a single floating body must support (buoyancy - weight of floating body - weight of CO2 inside the floating body).

[0136] In addition, when the yield strength of the highly corrosion-resistant metal material (Duplex STS) used in the present invention is 450 MPa and the yield strength of the comparative high-density polyethylene is 17.8 MPa, the durability of the float is estimated from the design safety factor, which is the ratio of the stress generated on the surface of the float due to the gas pressure inside the float to the yield strength of the float material.

[0137] As shown in Figure 8, as the immersion rate of the floaters increases, the pure buoyancy increases, and therefore the total number of floaters in the floating solar power generation system decreases.

[0138] Furthermore, if the thickness t of the float material is assumed to be 0.8 mm and the immersion rate is small, the comparative example in which the inside of the float is filled with foam and HDPE material is used as the outer material will have a smaller number of floats than the present invention because the density of HDPE is relatively low compared to metal.

[0139] However, in this case, in the case of the metal float according to the embodiment of the present invention, the design safety factor is 16 or more, whereas in the comparative example, when the thickness t of the float material is 0.8 mm, the design safety factor is 0.64, which means that durability is not ensured and damage occurs.

[0140] In addition, if the thickness of the HDPE float of the comparative example is increased to 19 mm in order to ensure the same design safety factor as the example of the present invention, it can be seen that a larger number of floats would be required than in the example of the present invention.

[0141] Furthermore, similar to the number of floats in the embodiment of the present invention, the thickness of the HDPE material in the comparative example is 6.15 mm, and the design safety factor at this time is 5. Therefore, it can be seen that the difference between the floats used in the comparative example and the embodiment of the present invention is more than three times greater in terms of durability, even excluding environmental impacts.

[0142] To guarantee a 20-year lifespan in a marine environment with twice-daily tidal phenomena, the floating structure must have a fatigue life that is nearly infinite.

[0143] For this reason, if we consider a typhoon, which is the greatest external force in the marine environment [it is reported that the pressure of a strong typhoon is 951 hectopascals (hPa), the speed of a typhoon is 70 m / s, and the speed of the current is close to 7.4 km / h], the floating body will be subjected to dynamic loads (pressure and speed of the current and sea breeze) in a direction parallel to the sea surface in addition to the static load related to its own weight in the vertical direction.

[0144] In normal cases, for a cycle life of 106 cycles (>20 years), which is known as an infinite lifespan, if the thickness of the float material according to the present invention is 0.8 mm, the allowable strength of the metal float is 219 MPa, taking into account the tensile strength of the material (620 MPa), the metal surface processing method taken into account when manufacturing the sphere, the load conditions (tension, compression, torsion), the operating temperature conditions, and other operating environments, and the safety factor against dynamic load is 9 or more, regardless of the immersion rate of the float.

[0145] In this case, the dynamic load safety factor is the sum of the resistance force of the submerged parts in the water due to tidal currents and the resistance force of the non-submerged parts due to typhoons, divided by the allowable strength calculated using the allowable strength, thickness of the floating body, radius of the floating body, etc.

[0146] In the case of the 6.15 mm thick HDPE spherical float of the comparative example shown in Figure 8, the safety factor against dynamic load is 2.83. Therefore, even excluding environmental influences, the difference between the comparative example and the float used in the example of the present invention is more than three times greater in terms of long-term use life and safety.

[0147] If a rectangular float is used in the comparative example instead of the spherical float according to the embodiment of the present invention, the safety factor against dynamic load of the comparative example may be further reduced due to the difference in the drag coefficient, which is an index of resistance to fluid energy.

[0148] Although the present disclosure has been described through the above preferred embodiments, the present invention is not limited thereto, and it will be readily understood by those skilled in the art to which the present invention pertains that various modifications and variations are possible without departing from the scope of the claims set forth below. [Explanation of symbols]

[0149] 10: Floating body for solar power generation system 100:Superstructure 101: Installation section 200: Substructure 300: Fixed part

Claims

1. an upper structure including a flat installation portion; a lower structure disposed corresponding to the upper structure and including a hemispherical shape that is convex in a direction away from the installation portion; a fixing portion that connects the upper structure and the lower structure; A floating structure for a solar power generation system, including:

2. 2. The floating body for a solar power generation system according to claim 1, wherein the upper structure has one of a hemispherical shape, a semi-conical shape, and a semi-ellipsoidal shape.

3. an upper flange portion extending in an outward direction of the upper structure; 3. The floating body for a photovoltaic power generation system according to claim 1, further comprising: a lower flange portion disposed corresponding to the upper flange portion and extending in an outward direction of the lower structure.

4. 4. The floating body for a solar power generation system according to claim 1, wherein the fixing portion connects the upper structure and the lower structure by screws or welding, or connects the upper flange portion and the lower flange portion by bolts or welding.

5. the upper flange portion includes a first upper groove; 5. The floating body for a solar power generation system according to claim 1, wherein the lower flange portion includes a first lower groove disposed corresponding to the first upper groove.

6. The floating body for a solar power generation system according to any one of claims 1 to 5, wherein a first non-metallic airtight pad is disposed between the first upper groove and the first lower groove.

7. the upper flange portion includes at least one second upper groove outside the first upper groove; 7. The floating body for a solar power generation system according to claim 1, wherein the lower flange portion includes a second lower groove disposed corresponding to the second upper groove.

8. The floating body for a photovoltaic power generation system according to any one of claims 1 to 7, wherein a second non-metallic airtight pad is disposed between the second upper groove and the second lower groove.

9. the upper flange portion includes an upper flat portion between the first upper groove and the second upper groove, The floating body for a solar power generation system according to any one of claims 1 to 8, wherein the lower flange portion includes a lower flat portion disposed between the first lower groove and the second lower groove in correspondence with the upper flat portion.

10. The floating body for a photovoltaic power generation system according to any one of claims 1 to 9, wherein a third non-metallic airtight pad is disposed between the upper flat portion and the lower flat portion.

11. The floating body for a solar power generation system according to any one of claims 1 to 10, wherein the first non-metallic airtight pad, the second non-metallic airtight pad, and the third non-metallic airtight pad are made of silicone.

12. The floating body for a solar power generation system according to any one of claims 1 to 11, wherein the installation section is provided with a connecting section for connecting one floating body to another floating body adjacent to the one floating body.

13. the installation section includes a communication section that communicates with an internal hollow section of the upper structure, 13. The floating body for a photovoltaic power generation system according to claim 1, wherein the communication section is provided with a positive pressure application device for applying a positive pressure to the inside of the upper structure.

14. The connecting portion is a first installation hole for installing the positive pressure applying device; A socket portion for providing a connecting frame for connecting to an adjacent floating body for a solar power generation system; The floating body for a photovoltaic power generation system according to any one of claims 1 to 13, comprising:

15. The floating body for a photovoltaic power generation system according to any one of claims 1 to 14, wherein a plurality of the socket portions are arranged at set intervals with the connecting portion as a reference.

16. The floating body for a photovoltaic power generation system according to any one of claims 1 to 15, wherein a cross-sectional shape of the socket portion is trapezoidal.

17. The floating body for a solar power generation system according to any one of claims 1 to 16, wherein at least one roller portion is provided inside the socket portion for supporting a mooring device cable passing through the socket portion.

18. The positive pressure applying device is an injection pipe communicating with the communication part for injecting a gas for applying a positive pressure; a valve cover provided on the injection pipe for closing the injection pipe; a support connected to the installation portion for supporting the injection pipe; The floating body for a photovoltaic power generation system according to any one of claims 1 to 17, comprising:

19. The injection tube is filled with air or carbon dioxide (CO ２ 19. The floating body for a photovoltaic power generation system according to claim 1, wherein the gas is injected at a set pressure.

20. The floating body for a photovoltaic power generation system according to any one of claims 1 to 19, wherein the upper structure and the lower structure are made of a metal material.

21. The floating body for a photovoltaic power generation system according to any one of claims 1 to 20, wherein the metal material is any one material selected from the group consisting of austenite, ferrite, and duplex stainless steel.

22. The floating body for a photovoltaic power generation system according to any one of claims 1 to 21, wherein the upper structure and the lower structure include dimples on their surfaces.

23. 23. The floating body for a photovoltaic power generation system according to claim 1, wherein heights of the upper structure and the lower structure are set to be smaller than radii of the upper structure and the lower structure.

24. The floating body for a photovoltaic power generation system according to any one of claims 1 to 23, wherein the socket portion is manufactured from the same metal material as the upper structure and the lower structure.

25. A photovoltaic power generation system comprising the floating body according to any one of claims 1 to 24.

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