Integrated floating wave power generation system for offshore platforms

Abstract

The present invention relates to an offshore platform-integrated floating wave power generation system in which the power generation devices and floaters are mounted on the upper and lower parts of the offshore platform, respectively, and the length of the power generation ropes connecting them is minimized, eliminating the need for mooring piles even when the platform is installed on the sea and eliminating piles that can bear pull-out forces, thereby minimizing construction costs and absorbing all of the kinetic energy of the floaters, which perform multi-degree-of-freedom motion, resulting in excellent power generation efficiency.The offshore platform-integrated floating wave power generation system of the present invention is characterized by comprising an offshore platform consisting of a plurality of support columns embedded in the seabed and a deck mounted on the top of the support columns above the seawater surface, a plurality of power generation devices mounted on the upper part of the offshore platform, floaters mounted on the seawater surface below the offshore platform and floating in response to wave movement, and a plurality of power generation ropes connecting the floaters to each power generation device.

Description

[Technical Field]

[0001] The present invention relates to an offshore platform-integrated floating wave power generation system in which the power generation equipment and float are respectively provided on the upper and lower parts of the offshore platform, minimizing the length of the power generation rope connecting them, and eliminating the need for mooring piles even while the platform is installed on the sea. Since there are no piles that can bear pull-out forces, construction costs can be minimized. Furthermore, the system can absorb all of the kinetic energy of the float, which moves with multiple degrees of freedom, resulting in excellent power generation efficiency. [Background technology]

[0002] In response to the global climate change crisis, countries around the world are making every effort to achieve carbon neutrality by 2050, and are particularly investing and making intensive efforts in the development of new and renewable energy sources.

[0003] Marine energy, a type of new renewable energy, is produced by converting ocean tides, waves, ocean currents, temperature differences, etc. into electricity or heat, and methods of producing electricity include tidal power, wave power, and temperature difference power generation.

[0004] Although South Korea is surrounded by the sea on three sides and has great potential for marine energy, which is a pollution-free, clean energy source, marine energy only accounts for a very small proportion of new and renewable energy, at around 1%.

[0005] On the other hand, wave power generation is a technology that generates electricity by converting the energy of incoming waves into the driving force of a prime mover such as a turbine.

[0006] Although wave power generation is limited in location and is somewhat uneconomical, it has the advantage of being able to produce energy permanently and not emitting greenhouse gases. This makes it a useful alternative for island regions where power supply and transportation are difficult, but energy demand is low and it is difficult to set up large-scale power generation facilities.

[0007] Existing wave power generation systems extract energy with a single degree of freedom, which is generated by the vertical change in height of a floating body installed on the water surface, so the energy recovery efficiency is low. In addition, since sufficient water depth is required, the system must be installed far from the coast, and the installation of undersea cables to transport electricity to land is expensive.

[0008] Here, in order to improve upon the conventional energy recovery technology using general up-and-down motion, a technology has been developed in which a float 300 is moored in the sea off the coast, the main power generation equipment 200 is installed on land or an artificial coast, and the float 300 and the power generation equipment 200 are connected with a power generation rope 400 (Figure 1, Registered Patent Nos. 10-1732243, 10-1769761, etc.).

[0009] This conventional technology does not require expensive undersea power cables and can be maintained on land, significantly reducing operating costs. Furthermore, because the floating structures are connected by multiple power-generating ropes, it can extract energy from the movement of waves coming from all directions, making it possible to efficiently obtain energy even from waves at low depths.

[0010] However, in the conventional technology, the power generation rope connects the floating structure installed on the sea to the power generation equipment on land, which limits cost reduction due to the long horizontal length of the expensive power generation rope. Also, if there is a tidal current or wave in the direction perpendicular to the power generation rope, a sag effect occurs, causing a delay in load transmission.

[0011] In addition, mooring piles 600 must be installed on the seabed to moor the floating body 300, and mooring lines 500 connected to the floating body 300 must be fixed to the upper part of the mooring piles 600. In this case, in order to avoid interference between the power generation ropes 400 and the mooring lines 500, the horizontal movement of the floating body 300 is large in order for the mooring lines 500 to form an appropriate horizontal angle, and therefore the amount of power generation rope 400 wound around the generator shaft is large, and the size of the generator rope drum becomes large.

[0012] Furthermore, if it is difficult to install a power generation facility on the coast or if the waves at the coast are not large enough, an artificial coast must be constructed by installing a separate offshore platform for installing the power generation facility on the sea. In this case, all of the power generation facility piles installed on the seabed to support the offshore platform 100 and the mooring piles for fixing the mooring lines must be constructed as pull-out resistant piles, which is a very inefficient design.

[0013] Furthermore, since the tops of the mooring piles are below the water surface and remain submerged, construction of the piles is difficult and uneconomical, and there is a risk of environmental damage. Summary of the Invention [Problem to be solved by the invention]

[0014] In order to solve the above problems, the present invention provides an offshore platform-integrated floating wave power generation system that minimizes the length of the power generation rope, does not require separate mooring piles to support the float even when the platform is installed on the sea, and does not have piles that are subject to pull-out force, thereby minimizing construction costs.

[0015] The present invention aims to provide an offshore platform-integrated floating wave power generation system that absorbs all of the kinetic energy of a floating body that performs multi-degree-of-freedom motion and has excellent power generation efficiency. [Means for solving the problem]

[0016] In a preferred embodiment, the present invention provides an offshore platform-integrated floating wave power generation system, characterized by comprising: an offshore platform composed of a plurality of support columns embedded in the seabed and a deck provided on top of the support columns above the sea surface; a plurality of power generation devices provided on the top of the offshore platform; a float provided on the sea surface below the offshore platform and floating in response to wave movement; and a plurality of power generation ropes connecting the float to each power generation device.

[0017] According to another preferred embodiment, the present invention provides an integrated floating wave power generation system for an offshore platform, wherein three or more of the power generation ropes are arranged radially on a plane on the outer circumferential surface of the float.

[0018] In another preferred embodiment, the present invention provides an offshore platform integrated floating wave power generation system, characterized in that it further includes at least three mooring lines arranged radially on a plane, one end connected to the outer periphery of the float and the other end connected to one side of the offshore platform, for mooring the float on the sea.

[0019] In another preferred embodiment, the present invention provides an integrated floating wave power generation system for an offshore platform, wherein the other end of the mooring line is connected to the top of the support column or to the under-deck near the support column.

[0020] In another preferred embodiment, the present invention provides an integrated floating wave power generation system for an offshore platform, wherein the mooring lines are provided in three sets, and the outer ends of each pair of mooring lines are connected to the same point, and the inner ends are connected tangentially to the outer periphery of each side of the float.

[0021] According to another preferred embodiment, the present invention provides an integrated floating wave power generation system for an offshore platform, wherein each of the power generation devices includes a generator and a counterweight frame, the generators are radially arranged on the upper deck, and the counterweight frames are structurally connected to each other at the center of the upper deck.

[0022] In another preferred embodiment, the present invention provides an offshore platform integrated floating wave power generation system, wherein the deck of the offshore platform is formed in a regular hexagonal shape in plan, support columns are provided at the bottom of each corner of the deck, and three power generation devices and three power generation ropes are provided.

[0023] In another preferred embodiment, the present invention provides an offshore platform integrated floating wave power generation system, characterized in that multiple offshore platforms are combined in a honeycomb pattern on a plane, and adjacent offshore platforms 1 share support columns with each other.

[0024] According to another preferred embodiment, the present invention provides an integrated floating wave power generation system for an offshore platform, wherein the float is configured by assembling a plurality of float units, and the assembled float has an outer diameter larger than the net spacing between adjacent support columns.

[0025] In another preferred embodiment, the present invention provides an integrated floating wave power generation system for an offshore platform, characterized in that the floating units are formed into a fan shape by dividing a circular float into three radially, and the inner ends of the mooring lines are connected to the outside of the joints of adjacent floating units.

[0026] In another preferred embodiment, the present invention provides an integrated floating wave power system for an offshore platform, characterized in that the mooring lines are configured to connect a combination of rigid tension members and elastic tension members in parallel.

[0027] According to another preferred embodiment, the present invention provides an offshore platform integrated floating wave power generation system, characterized in that a desalination facility and an energy storage system are further included on top of the offshore platform. [Effects of the Invention]

[0028] The present invention has the following advantages.

[0029] First, since the power generation device and the float connected by the power generation rope are installed at the top and bottom of the offshore platform, respectively, it is possible to provide an integrated floating wave power generation system for the offshore platform, which minimizes the length of the power generation rope and significantly reduces the amount of material required.

[0030] Second, because the float is connected to the offshore platform by mooring lines, there is no need to install separate mooring piles on the seabed to moor the float, which reduces the amount of construction work and eases the difficulty of construction.

[0031] Third, when three or more power-generating ropes are arranged radially on a plane around the outer surface of the float, the float, which has multiple degrees of freedom of movement, can always generate electricity regardless of the direction it moves, resulting in excellent power generation efficiency.

[0032] Fourth, because the floating structure is integrated with the offshore platform on which the power generation equipment is installed, the power generation system can be made compact, occupying no space other than the area of ​​the offshore platform itself, requiring only a small area on the water surface, and posing a low risk to navigation. [Brief explanation of the drawings]

[0033] [Figure 1] FIG. 1 is a perspective view showing a conventional wave power generation system that uses power generation ropes.

[0034] [Figure 2] FIG. 2 is a plan view showing the wave power generation system shown in FIG.

[0035] [Figure 3] FIG. 3 is a perspective view showing an integrated floating wave power generation system of an offshore platform according to the present invention.

[0036] [Figure 4] FIG. 4 is a front view showing the offshore platform integrated floating wave power generation system of the present invention.

[0037] [Figure 5] FIG. 5 is a diagram showing the degree of freedom of movement of a floating body.

[0038] [Figure 6] FIG. 6 is a plan view showing the superstructure of the wave power generation system of the present invention.

[0039] [Figure 7] FIG. 7 is a plan view showing the lower structure of the wave power generation system of the present invention.

[0040] [Figure 8] FIG. 8 is a diagram showing a mooring method for a float in a conventional wave power generation system.

[0041] [Figure 9] FIG. 9 is a diagram showing a mooring method for a floating body according to the present invention.

[0042] [Figure 10] FIG. 10 is a plan view of an embodiment with an extendable offshore platform. [Figure 11] FIG. 11 is a plan view of an embodiment with an extendable offshore platform. [Figure 12] FIG. 12 is a plan view of an embodiment with an extendable offshore platform.

[0043] [Figure 13] FIG. 13 is a perspective view showing the connection relationship of the floating body units.

[0044] [Figure 14] FIG. 14 is a perspective view showing a floating body equipped with a fender.

[0045] [Figure 15] FIG. 15 is a perspective view showing a floating body unit.

[0046] [Figure 16] FIG. 16 is a diagram showing a conventional load transfer method for mooring ropes connected toward the center of a floating body.

[0047] [Figure 17] FIG. 17 is a diagram showing a load transmission method for mooring lines connected in the tangential direction of a floating body in the present invention.

[0048] [Figure 18] FIG. 18 is a diagram showing the operational relationship of the composite mooring rope.

[0049] [Figure 19] FIG. 19 is a conceptual diagram of a power generating device. DETAILED DESCRIPTION OF THE INVENTION

[0050] The present invention will now be described in detail with reference to the accompanying drawings and preferred embodiments.

[0051] FIG. 3 is a perspective view showing an offshore platform integrated floating wave power generation system of the present invention, and FIG. 4 is a front view showing an offshore platform integrated floating wave power generation system of the present invention.

[0052] As shown in Figures 3 and 4, the offshore platform integrated floating wave power generation system of the present invention is characterized by comprising an offshore platform 1 consisting of a plurality of support columns 11 embedded in the seabed and a deck 12 provided on top of the support columns 11 above the sea surface; a plurality of power generation devices 2 provided on top of the offshore platform 1; a float 3 provided on the sea surface below the offshore platform 1 and floating in response to wave movement; and a plurality of power generation ropes 4 connecting the float 3 to each power generation device 2.

[0053] The present invention aims to provide an offshore platform-integrated floating wave power generation system with excellent power generation efficiency, which minimizes construction costs by minimizing the length of the power generation ropes 4 and eliminating the need for separate mooring piles even when the offshore platform 1 is installed on the sea, and which has no piles to bear pull-out forces, and can absorb all the kinetic energy of the float 3, which performs multi-degree-of-freedom motion.

[0054] The present invention comprises an offshore platform 1 , a power generation device 2 , a floating body 3 , and a power generation rope 4 .

[0055] The offshore platform 1 comprises a plurality of support columns 11 embedded in the seabed and a deck 12 provided on top of the support columns 11 above the sea surface.

[0056] The support columns 11 are provided on the outer hull side of the deck 12 and support the deck 12 .

[0057] The lower part of the support pillar 11 is embedded in the seabed at a certain depth, and the upper part protrudes a certain length above the sea surface.

[0058] The deck 12 is placed and fixed on the upper part of the support columns 11.

[0059] The deck 12 is spaced above the sea level by a certain height, forming a predetermined space between the deck and the sea level.

[0060] A plurality of the power generating devices 2 are provided on the top of the offshore platform 1 .

[0061] The power generation device 2 is provided on the upper part of the deck 12 of the offshore platform 1 .

[0062] The power generation device 2 includes a generator 21 (power take off system, PTO), a counterweight frame 22 including a CWS (counter weight system), a power conversion device 23 (power conversion system, PCS), and the like.

[0063] The floating body 3 is provided on the sea surface below the offshore platform 1 and floats on the water in response to the movement of waves.

[0064] The floating body 3 is preferably formed in a circular shape on a plane.

[0065] The power generation ropes 4 connect the floating body 3 to each power generation device 2 .

[0066] The power generation rope 4 can connect the floating body 3 and the generator 21 of the power generation device 2 .

[0067] The power generation rope 4 transmits the kinetic energy of the floating body 3 to the generator 21 of the power generation device 2.

[0068] A plurality of the power generation devices 2 are provided, and the power generation ropes 4 are provided in a number corresponding to the power generation devices 2 and are connected to the corresponding power generation devices 2, respectively.

[0069] The float 3 is located below the deck 12, and the power generation device 2 is located above the deck 12. Therefore, in order for the power generation rope 4 to connect the float 3 and the power generation device 2 and transmit the kinetic energy of the float 3 to the power generation device 2 via the power generation rope 4, the power generation rope 4 must be bent appropriately.

[0070] Therefore, a first pulley P1 can be provided inside one point of the support column 11. The power generation rope 4, one end of which is fixed to the floating body 3, can be bent around the first pulley P1, passed through the deck 12, and pulled out to the top of the deck 12.

[0071] A second pulley P2 is provided on the upper part of the deck 12 in order to connect the power generation rope 4 drawn out to the upper part of the deck 12 to the generator 21 of the power generation device 2. The power generation rope 4 can be connected to the generator 21 by passing it around the second pulley P2 and bending it towards the generator 21.

[0072] The first pulley P1 is preferably provided at a position lower than the bottom of the float 3, i.e., on one side of the support column 11 in the water. The power generation rope 4 is bent by the first pulley P1, and the vertical component force acting on the power generation rope 4 due to the movement of the float 3 acts upward, so no pulling force is applied to the support column 11.

[0073] In the present invention, the offshore platform 1 on which the power generation device 2 is installed and the floating body 3 are integrated, making it possible to make the power generation system compact, and there are no restrictions on the installation location.

[0074] In addition, since there is no space occupied other than the area of ​​the offshore platform 1 itself, the permitted area of ​​the water surface is small and the risk of navigation is low. In addition, since there is no need to install separate pull-out piles on the seabed to moor the floating body 3, the amount of construction work and the difficulty of construction can be reduced.

[0075] In addition, the power generation device 2 is installed on the top of the floating body 3, which can significantly reduce the amount of power generation rope 4, which is an expensive consumable item, and since the power generation rope 4 has no horizontal sag, diving work is not required when replacing the power generation rope 4.

[0076] FIG. 5 is a diagram showing the degree of freedom of movement of the float, FIG. 6 is a plan view showing the upper structure of the wave power generation system of the present invention, and FIG. 7 is a plan view showing the lower structure of the wave power generation system of the present invention.

[0077] As shown in FIGS. 6 and 7, three or more power generation ropes 4 can be arranged radially on a plane on the outer circumferential surface of the floating body 3.

[0078] In a conventional coastal power generation system using a power generation rope, the floating body 300 and the power generation device 200 are horizontally spaced apart, and the power generation rope 400 is installed in one direction (FIG. 2).

[0079] Therefore, when movement occurs in the floating body 300, each power generation rope 400 is pulled in the same direction. Here, since the rope drums of each power generation device 200 rotate only in the same direction, the counterweight rotates the rope drum in the opposite direction, and when it wraps around the power generation rope 4, power generation is not possible.

[0080] In contrast to this, in the present invention, the power generation device 2 is provided on the top of the floating body 3 .

[0081] Therefore, if three or more power generating ropes 4 are connected radially on a plane around the outer surface of the float 3 so that the tensions are balanced, it will be possible to absorb energy from all components of the six degrees of freedom of the float 3, namely, axial movements of each coordinate axis, such as surging, swaying, and heaving, and rotational movements about each coordinate axis, such as rolling, pitching, and yawing (Figure 5).

[0082] For example, when the float 3 moves to one side, the power generation rope 4 located on one side is wound by the counterweight, temporarily suspending power generation, while the power generation rope 4 located on the other side is pulled, rotating the rope drum and generating power.

[0083] By arranging the power generation ropes 4 radially in this way, power can be generated at all times regardless of the direction in which the floating body 3 moves, resulting in excellent power generation efficiency.

[0084] The horizontal force acting on the offshore platform 1 due to the movement of the floating body 3 is generated by the difference, not the sum, of the tensions of the power generation ropes 4. As a result, the offshore platform 1 is subjected to a much smaller horizontal force, which can significantly reduce the amount of construction work on the offshore platform 1.

[0085] As shown in Figures 3, 6, etc., each power generation device 2 is configured to include a generator 21 and a counterweight frame 22, and the generators 21 are arranged radially on the upper part of the deck 12, and the counterweight frames 22 can be provided so as to be structurally connected to each other at the center of the upper part of the deck 12.

[0086] In existing wave power generation systems, each generator is assigned and connected to a separate power generation rope, and each generator is individually equipped with a counterweight frame that is equipped with a counterweight system for winding the rope drum, which poses a problem of requiring a large area for the offshore platform.

[0087] In addition, because the generator ropes are arranged in parallel in one direction, the generator and counterweight frame must also be arranged in a line on the outer casing of the deck of the offshore platform, which inevitably results in an imbalance in the load on the lower piles, making the design and construction complicated.

[0088] In contrast to this, in the present invention, the power generating ropes 4 are arranged radially on a plane on the outer circumferential surface of the float 3, and the corresponding generators 21 are arranged radially around the center of the deck 12, and the counterweight frames 22 are concentrated in the center of the deck 12, thereby enabling the structure to be integrated.

[0089] As a result, the counterweight frame 22 is formed as a shared structure, and the area occupied by the counterweight frame 22 is reduced, thereby minimizing the scale of the offshore platform 1.

[0090] In addition, since many power generating units 2 are concentrated in the center of the deck 12, the load of the superstructure is evenly distributed to the lower support columns 11, which results in easier design and construction of the deck 12 and support columns 11.

[0091] FIG. 8 is a diagram showing a mooring method for a float in a conventional wave power generation system, and FIG. 9 is a diagram showing a mooring method for a float in the present invention.

[0092] As shown in Figures 7, 9, etc., the floating body 3 may further include mooring lines 5, of which at least three are arranged radially on a plane to moor the floating body 3 on the sea, one end of which is connected to the outer periphery of the floating body 3 and the other end of which is connected to one side of the offshore platform 1.

[0093] In order to prevent damage to the power generation system when excessively strong waves act on it, mooring facilities that can limit the horizontal movement of the floating body 3 are required.

[0094] In a conventional coastal power generation system using power ropes, multiple mooring piles 600 are embedded into the seabed, and mooring lines 500 are connected to each mooring pile 600 to moor the float 300. In other words, an inclined mooring method is used, in which the mooring lines 500 are fixed to the seabed. Figure 8 (a) and (b) show the float 300 before and after it moves using the inclined mooring method, respectively.

[0095] In this inclined mooring method, each mooring pile 600 bears the mooring load, and as the float 300 moves, only some of the mooring piles 600 bear the load, which results in an excessively large design load for the mooring piles 600 and an increase in the amount of construction work. Furthermore, as the mooring piles 600 are installed underwater, underwater work is required to cut the piles and trim their heads, and as they are constructed as pull-out piles, the amount of construction work increases, including an increase in the depth of the embedded piles. Furthermore, the inclined mooring method has the problem that the vertical and horizontal components of the mooring ropes 500 work together, making it impossible to avoid the floating body 300 from swaying, resulting in a large movement distance for the floating body 300.

[0096] In contrast, in the present invention, the floating body 3 is provided at the same position on the plane as the offshore platform 1, so that three or more mooring lines 5 are radially arranged on the outer hull of the floating body 3 and fixed to the offshore platform 1, thereby enabling a horizontal mooring method fixed to the offshore structure (Figure 9).

[0097] 9(a) and 9(b) respectively show the state before and after the movement of the floating body 300 in the horizontal mooring system.

[0098] The offshore platform 1 has a deck 12 on top of the multiple support columns 11, and the deck 12 connects the upper sections of the multiple support columns 11, causing rigid body behavior in the in-plane direction. Therefore, if multiple mooring lines 5 are connected to the offshore platform 1, even if a load is applied to only one of the mooring lines 5, the load is transmitted via the deck 12 and distributed to all the support columns 11.

[0099] In other words, since all the support columns 11 share and support the mooring load, the design load that each support column 11 must bear can be reduced, and the amount of construction work can be reduced.

[0100] Furthermore, since the float 3 is supported only by the horizontal force of the mooring rope 5, the rocking of the float 3 can be significantly reduced, and since the float 3 is supported radially, the amount of movement of the float 3 can be minimized.

[0101] On the other hand, the offshore platform 1 itself can be partially broken up in response to extremely high waves, reducing the maximum tension in the mooring lines 5 .

[0102] As shown in FIGS. 4 and 9, the other end of the mooring line 5 can be connected to the top of the support pillar 11 or the bottom of the deck 12 near the support pillar 11.

[0103] In the present invention, the mooring rope 5 is arranged in a horizontal mooring manner, so that the mooring load acts on the support pole 11 as a horizontal force.

[0104] In this case, the mooring load generates a bending moment or shear force in the support column 11. Therefore, by connecting the other end of the mooring line 5, which is connected to the offshore platform 1, to the top of the support column 11 or the bottom of the deck 12, it is possible to prevent the bending moment or shear force from being generated in the support column 11.

[0105] This makes the load conditions of the support pillars 11 with and without the mooring ropes 5 fixed similar, and all support pillars 11 can be designed to have the same cross section regardless of whether the mooring ropes 5 are fixed or not.

[0106] As shown in Figures 7 and 9, the mooring lines 5 are provided in three sets, and the outer ends of each pair of mooring lines 5 are connected to the same point, and the inner ends are connected tangentially to the outer periphery of both sides of the floating body 3, respectively.

[0107] In the existing inclined mooring method, the mooring lines are connected to the float so that they point toward the center of the float, making it difficult to prevent the float from surging, swaying, and yawing.

[0108] In the present invention, the inner end portion, which is one end of the mooring rope 5, can be connected in the tangential direction of the float 3, rather than in the direction toward the center of the float 3.

[0109] Here, the mooring lines 5 are provided in three sets of two each, for a total of six mooring lines 5, and the three sets of mooring lines 5 may be arranged radially around the float 3. The outer ends of each pair of mooring lines 5 may be connected to the same point (e.g., the same support pillar 11), and the inner ends may be connected tangentially to the outer periphery of the float 3 on both sides in a symmetrical manner.

[0110] This makes it possible to prevent the floating body 3 from surging, swaying, and yawing.

[0111] For example, when yawing occurs in the floating body 3, a tensile force acts on one of the pairs of mooring lines 5, and the tension of the mooring lines 5 can prevent the yawing.

[0112] In this way, since the plurality of mooring lines 5 can simultaneously support the movement of the floating body 3, the maximum tension of the mooring lines 5 can be reduced.

[0113] In addition, the movement range of the floating body 3 can be reliably controlled to reduce the slack length of the power generation rope 4 wound around the rope drum, thereby reducing the height of the counterweight frame 22 for accommodating the counterweight.

[0114] As shown in Figures 3 and 7, the deck 12 of the offshore platform 1 is formed in a regular hexagonal shape on a plane, and support columns 11 are provided at the bottom of each corner of the deck 12, and three power generation devices 2 and three power generation ropes 4 may be provided.

[0115] The deck 12 of the offshore platform 1 may be formed in a polygonal shape such as a triangle or a rectangle. Also, the offshore platform 1 may be formed in a regular hexagonal shape that is close to a circle, so as to maximize the operating range of the floating body 3 and obtain sufficient power generation capacity.

[0116] In this case, six support columns 11 are provided, each of which can be installed at the bottom of each corner of the deck 12.

[0117] Here, each power generation rope 4 is pulled out to the top of the deck 12 via every other three of the six support pillars 11 .

[0118] When the mooring rope 5 is provided, the mooring rope 5 can be fixed to a support pillar 11 between the support pillars 11 to which the power generation rope 4 is connected, i.e., to a support pillar 11 to which the power generation rope 4 is not connected.

[0119] In this way, if the power generation ropes 4 and the mooring ropes 5 are arranged alternately in a radial pattern, tensions are balanced and a stable structure can be formed.

[0120] When the mooring lines 5 are provided in three sets and connected tangentially to the float 3, if the power generation rope 4 is connected to the point where the mooring lines 5 are connected to the float 3, the power generation rope 4 and the mooring lines 5 will not interfere with each other.

[0121] 10 to 12 are plan views showing an embodiment equipped with an extendable offshore platform.

[0122] As shown in FIGS. 10 to 12, a plurality of the offshore platforms 1 are combined in a honeycomb shape on a plane, and adjacent offshore platforms 1 can share support columns 11 with each other.

[0123] In the present invention, the floating body 3 is installed at the same position on the plane as the offshore platform 1 and does not occupy any space other than the area of ​​the offshore platform 1 itself, so that it can be freely expanded on the plane.

[0124] In particular, if the unit deck 12 is formed in a regular hexagon, it can be easily expanded in a honeycomb shape, allowing large-scale power plants to be designed according to power generation demand.

[0125] Here, adjacent offshore platforms 1 can share the support columns 11 with each other, thereby minimizing the installation locations of the support columns 11.

[0126] Adjacent offshore platforms 1 may have separate decks 12 connected to each other, or may have a single overall deck 12 .

[0127] On the other hand, mooring piles are generally designed taking into account the barge's docking load. However, since the barge's docking load is greater than the mooring load, there is a problem in that the mooring piles are designed in excess of what is necessary.

[0128] Incidentally, the offshore platform 1 of the present invention can be designed economically because the multiple support columns 11 behave as a unit thanks to the deck 12, and when the offshore platform 1 is expanded, the number of support columns 11 increases, greatly reducing the burden on individual piles against the barge's docking load.

[0129] FIG. 13 is a perspective view showing the connection relationship of the floating body units, and FIG. 14 is a perspective view showing a floating body equipped with fenders.

[0130] As shown in FIGS. 13 and 14, the float 3 is constructed by assembling a plurality of float units 30, and the assembled float 3 has an outer diameter larger than the net spacing between adjacent support columns 11.

[0131] In order to prevent the floating body 3 from being lost when the mooring lines 5 are cut, it is preferable that the outer diameter of the floating body 3 is larger than the net distance between adjacent support columns 11. Therefore, even if the mooring lines 5 are cut, the floating body 3 is supported by the support columns 11, and therefore can be prevented from being lost.

[0132] However, in this case, it is difficult to insert the floating body 3 between the support columns 11 when installing or installing the power generation system.

[0133] Therefore, the float 3 can be divided into a plurality of float units 30 so that the width is smaller than the net spacing between the adjacent support columns 11 .

[0134] Each floating body unit 30 is preferably formed as an individually buoyant structure (for example, a hollow, closed structure) that can enter between the support columns 11 through the sea surface.

[0135] The floating body 3 is provided with a fender 31 on its upper outer surface (FIG. 14).

[0136] A deck 12 of the offshore platform 1 is provided on top of the floating body 3 .

[0137] The deck 12 acts as a stopper for the float 3 during storms, preventing excessive heaving, rolling, and pitching of the float 3, and reduces the maximum tension of the mooring ropes 5 by controlling the range of motion in advance so that the float 3 does not generate excessive energy that the power generation ropes 4 cannot withstand.

[0138] Here, the floating body 3 may be provided with a fender 31 on the outer periphery of the upper surface thereof to absorb impacts at the time of collision under the deck 12.

[0139] Figure 15 is an oblique view showing a floating body unit, Figure 16 is a diagram showing the load transmission method of mooring lines connected toward the center of the conventional floating body, and Figure 17 is a diagram showing the load transmission method of mooring lines connected in the tangential direction of the floating body in the present invention.

[0140] As shown in Figures 13, 15, 17, etc., the floating body unit 30 is formed in a fan shape by radially dividing the circular floating body 3 into three parts, and the inner end of the mooring line 5 can be connected to the outside of the joint of adjacent floating body units 30.

[0141] When the float 3 is circular, the float units 30 can be formed in a fan shape by dividing the float 3 into three radial parts so that the joint surfaces between adjacent float units 30 pass through the center of gravity of the float 3.

[0142] The floating body unit 30 is composed of a fan-shaped upper plate 301, a lower plate 302, side walls 303 on both sides, and an outer wall 304 formed in an arc shape on the outside (FIG. 15).

[0143] Here, the dividing surfaces of the float 3, that is, the joint surfaces between the adjacent float units 30, function as reinforcement materials for the float 3 as the side walls 303 of the float units 30 on both sides overlap.

[0144] As shown in Figures 7 and 9 above, when three pairs of mooring lines 5 are connected in the tangential direction of the float 3, setting the joint of the float unit 30 as the mooring point will induce the maximum in-plane force on the outer wall 304 of the float 3, which is advantageous for load resistance.

[0145] Here, the normal component of the mooring force is borne by the side wall 303 of the joining surface.

[0146] Therefore, if the mooring ropes 5 are fixed to the outside of the joints of the floating body units 30, deformation or damage of the floating body 3 due to the mooring force can be prevented even during storms.

[0147] Figure 17 shows the load transfer method of mooring lines 5 connected tangentially to the float 3, and Figure 17(a) and (b) show a float 3 supported by a pair of mooring lines 5 fixed to the same support column 11 and another support column 11, respectively.

[0148] In both (a) and (b) of Figure 17, the side walls 303 of the floating body 3 support the load in the in-plane direction due to the arch effect, so that no in-plane deformation occurs in the side walls 303 of the floating body 3.

[0149] FIG. 18 is a diagram showing the operational relationship of the composite mooring rope.

[0150] As shown in FIG. 18, the mooring rope 5 has a configuration in which a rigid tension member 51 and an elastic tension member 52 are combined and connected in parallel.

[0151] If the mooring rope 5 is made of an elastic tension material, it can provide an appropriate restoring force when the float 3 moves in service, i.e., when the waves are not too large. However, in extreme conditions such as during a storm when the waves are very large, the movement distance of the float 3 increases too much, and there is a limit to mooring.

[0152] On the other hand, if the mooring rope 5 is made of a rigid tensile material, the movement distance of the float 3 can be effectively limited in an extreme condition, but the mooring effect cannot be expected in a service condition. Furthermore, when the extreme condition is reached, a large impact is applied to the float 3, which may cause damage to the float 3.

[0153] Therefore, in order to reduce the mooring force acting on the float 3 and reduce the impact on the float 3 caused by the mooring force, the mooring rope 5 can be constructed by combining a rigid tension member 51 and an elastic tension member 52.

[0154] The elastic tension members 52 and the rigid tension members 51 can all be connected at one end to the offshore platform 1. Alternatively, the elastic tension members 52 and the rigid tension members 51 can all be connected at one end to the floating body 3.

[0155] Here, the other end of the elastic tension member 52 may be connected to a point in the middle of the rigid tension member 51 .

[0156] In this case, the portion of the rigid tension member 51 in the section where both ends of the elastic tension member 52 are connected is formed to be longer than the length of the elastic tension member 52 in the initial state so that it does not support the load in the service state (Figure 18 (a)).

[0157] Depending on the case, taking into consideration the length of the mooring rope 5, the maximum movement of the floating body 3, etc., the elastic tension member 52 and the rigid tension member 51 may be configured so that both ends are connected to each other.

[0158] In the service state, the float 3 is supported by the elastic tension members 52, providing a restoring force against the movement of the float 3 (Figure 18(a)), and in extreme conditions such as during a storm, the elastic tension members 52 stretch and become the same length as the corresponding rigid tension members 51, and the float 3 is supported by the rigid tension members 51, restricting the movement of the float 3 (Figure 18(b)).

[0159] Here, before the float 3 is supported by the rigid tension member 51, the tension of only the elastic tension member 52 increases linearly with an increase in mooring force, so the impact acting on the float 3 by the mooring rope 5 can be greatly reduced at the point when the rigid tension member 51 begins to support.

[0160] FIG. 19 is a conceptual diagram of a power generating device.

[0161] As shown in FIG. 19, the top of the offshore platform 1 may further include a desalination facility 25 and an energy storage system 24.

[0162] The present invention is installed on the sea to supply power to island regions, which often lack fresh water that can be used for domestic and industrial purposes.

[0163] Therefore, seawater can be desalinated using a power generation system installed on the sea and supplied to land.

[0164] For this purpose, a desalination facility 25 can be further provided on the top of the offshore platform 1. The desalination facility 25 is operated using electricity produced by the power generation device 2.

[0165] An energy storage system (ESS) 24 may be provided to supply the electricity produced by the power generation device 2 to the power grid or to store the electricity when the desalination plant 25 is not in operation (FIG. 19).

[0166] The power generation device 2 may further include a controller 26 that adjusts the amount of power transmission, whether or not the freshwater process is operating, and the storage capacity of the energy storage system 24 according to the power consumption capacity and the power generation environment.

Claims

1. An offshore platform 1 including a plurality of support columns 11 embedded in the seabed and a deck 12 provided on the top of the support columns 11 above the sea surface; A plurality of power generation devices 2 provided on the upper part of the offshore platform 1; a floating body 3 provided on the sea surface below the offshore platform 1 and floating in response to wave movement; a plurality of power generation ropes 4 connecting the float 3 and each power generation device 2; An integrated floating wave power generation system for an offshore platform, characterized by comprising:

2. 2. The offshore platform integrated floating wave power generation system according to claim 1, wherein three or more power generation ropes (4) are arranged radially on a plane on the outer circumferential surface of the float (3).

3. 2. The offshore platform integrated floating wave power generation system according to claim 1, further comprising at least three mooring lines (5) arranged radially on a plane, one end of which is connected to the outer periphery of the float (3) and the other end of which is connected to one side of the offshore platform (1), for mooring the float (3) on the sea.

4. The offshore platform integrated floating wave power generation system according to claim 3, characterized in that the other end of the mooring line (5) is connected to the top of the support column (11) or the bottom of the deck (12) near the support column (11).

5. The offshore platform integrated floating wave power generation system according to claim 4, characterized in that the mooring lines 5 are provided in three sets, the outer ends of each pair of mooring lines 5 are connected to the same point, and the inner ends of each pair of mooring lines 5 are connected tangentially to the outer peripheral surfaces on both sides of the float 3, respectively.

6. 3. The integrated floating wave power generation system for an offshore platform according to claim 2, wherein each of the power generation devices 2 is configured to include a generator 21 and a counterweight frame 22, the generators 21 are radially arranged on the upper part of the deck 12, and the counterweight frame 22 is provided at the center of the upper part of the deck 12 so as to be structurally connected to each other.

7. 2. The offshore platform integrated floating wave power generation system according to claim 1, wherein the deck 12 of the offshore platform 1 is formed in a regular hexagonal shape on a plane, support columns 11 are provided at the bottom of each corner of the deck 12, and three power generation devices 2 and three power generation ropes 4 are provided.

8. The offshore platform integrated floating wave power generation system according to claim 7, characterized in that a plurality of the offshore platforms 1 are combined in a honeycomb shape on a plane, and adjacent offshore platforms 1 share support columns 11 with each other.

9. The integrated floating wave power generation system for an offshore platform according to claim 7, wherein the float (3) is constructed by assembling a plurality of float units (30), and the assembled float (3) has an outer diameter larger than the net spacing between adjacent support columns (11).

10. 10. An integrated floating wave power generation system for an offshore platform as described in claim 9, characterized in that the floating units 30 are formed in a fan shape by radially dividing the circular float 3 into three parts, and the inner ends of the mooring lines 5 are connected to the outsides of the joints of adjacent floating units 30.

11. The integrated floating wave power generation system for an offshore platform according to claim 3, characterized in that the mooring ropes (5) are configured so that rigid tension members (51) and elastic tension members (52) are connected in parallel in combination.

12. The offshore platform integrated floating wave power generation system according to claim 1, characterized in that the top of the offshore platform (1) further comprises a desalination facility (25) and an energy storage system (24).

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