Power generation facility and power generation method

Abstract

Provided is a power generation facility that is able to achieve an increase in natural energy power conversion devices efficiently. This power generation facility (1) comprises: a floating body (3) th

Description

Title of Invention POWER GENERATION FACILITY AND POWER GENERATION METHOD Technical Field

[0001] The present disclosure relates to a power generation facility and a power generation method that generate power using tidal current. Background Art

[0002] A power generation facility that obtains electricity from natural energy in the ocean has been proposed in various ways. For example, PTL 1 discloses a hull including a solar power generation facility, a wind power generation facility, a wave power generation facility, and a tidal current power generation facility. Citation List Patent Literature

[0003] [PTL 1] Japanese Registered Utility Model No. 3169982 Summary of Invention Technical Problem

[0004] However, in PTL 1, a power conversion device that converts wave power energy and tidal current energy into power is provided, but a generator is installed for each of the power conversion devices, so that not only installation and maintenance costs are increased, but also an energy loss occurs in each generator, which is not preferable . In consideration of an increase in the number of the power conversion devices with an increase in the size or scale of the power generation facility, it is necessary to examine an installation form having a wide application range. In particular, unlike a self-navigating hull described in PTL 1, it is preferable that the number of installation units can be flexibly increased or decreased in a case where the power conversion device is installed on a floating body moored in the ocean.

[0005] The present disclosure has been made in view of such circumstances, and an object of the present disclosure is to provide a power generation facility and a power generation method capable of efficiently realizing an increase in the number of power conversion devices that convert tidal power and / or wave power into power, and maintenance work thereof. Solution to Problem

[0006] A power generation facility according to one aspect of the present disclosure includes a floating body that is moored and floats on a surface of water, a plurality of power conversion modules that are provided on the floating body and convert tidal current and / or wave power into power, a common power generation module that is provided on the floating body and that converts the power guided from each of the power conversion modules into electricity and a power transmission module that transmits the electricity generated by the power generation module to an outside .

[0007] A power generation method according to one aspect of the present disclosure includes a step of converting tidal current and / or wave power into power by using a plurality of power conversion modules provided on a floating body that is moored and floats on a surface of water, a step of converting the power guided from each of the power conversion modules into electricity by using a common power generation module, and a step of transmitting the electricity generated by the power generation module to an outside by using a power transmission module. Advantageous Effects of Invention

[0008] It is possible to efficiently realize an increase in the number of power conversion devices that convert tidal power and / or wave power into power. Brief Description of Drawings

[0009] Fig. 1 is a schematic configuration diagram showing a power generation facility according to a first embodiment of the present disclosure. Fig. 2 is a schematic configuration diagram showing a hydraulic circuit of a tidal current power generation facility of Fig. 1. Fig. 3 is a schematic configuration diagram showing a modification example of Fig. 2. Fig. 4 is a schematic configuration diagram showing an air flow of a wave power generation facility of Fig. 1. Fig. 5 is a schematic configuration diagram showing a modification example of Fig. 4. Fig. 6 is a plan view showing a state in which a plurality of floating bodies are arranged. Fig. 7 is a bottom view showing a power generation facility according to a second embodiment. Fig. 8 is a vertical cross-sectional view showing a schematic configuration of the power generation facility of Fig. 7. Fig. 9 is a bottom view showing a state in which a floating body of Fig. 7 is plural, and the plurality of floating bodies are arranged. Fig. 10A is a bottom view of the floating body of Fig . 7. Fig. 10B is a side view of Fig. 10A. Fig. 11 is a bottom view showing a state in which a floating body is moored by a mooring cable provided with an expansion and contraction device. Description of Embodiments

[0010] Hereinafter, an embodiment according to the present disclosure will be described with reference to the drawings . [First Embodiment] Hereinafter, a first embodiment of the present disclosure will be described. Fig. 1 shows a power generation facility 1 according to the first embodiment. The power generation facility 1 includes a floating body 3, a tidal current power generation facility 5, a wave power generation facility 7, and a solar power generation device 9.

[0011] The floating body 3 has a box shape that is, for example, a rectangular parallelepiped with an internal cavity, and floats on a sea surface WS. The floating body 3 is moored to a fixed point in the sea (not shown) by a mooring cable 11.

[0012] The tidal current power generation facility 5 includes a tidal current turbine 13. The tidal current turbine 13 is rotated by tidal current TS. The rotational force of the tidal current turbine 13 is transmitted from a first shaft 15 extending in a horizontal direction to a second shaft 17 extending in a vertical direction. Between the first shaft 15 and the second shaft 17, for example, two bevel gears 16 are provided. A type of the bevel gears is not limited as long as the rotational force in the horizontal direction by the tidal current turbine 13 can be converted into a rotational force in the vertical direction. The second shaft 17 is provided to penetrate the floating body 3.

[0013] A hydraulic pump 19 is connected to the second shaft 17. The hydraulic pump 19 is provided in an upper space of the floating body 3, that is, above the sea surface WS. As a result, since the hydraulic pump 19 is easily accessible, a maintenance is easily performed. The hydraulic pump 19 is driven by the rotational force transmitted from the second shaft 17, and a hydraulic fluid (hydraulic oil) is pressurized by the hydraulic pump 19 to equal to or higher than a predetermined pressure. As a result, the tidal current TS is converted into power (hydraulic pressure). The hydraulic oil pressurized by the hydraulic pump 19 is guided to a hydraulic motor 23 through a hydraulic pipe 21.

[0014] The tidal current TS reverses a flow direction thereof (flow-change) several times a day. A hydraulic circuit 25 is provided as shown in Fig. 2 such that the hydraulic oil guided to the hydraulic motor 23 flows in one direction even in a case where the tidal current TS flow-changes. In Fig. 2, solid line arrows indicate rotation and flow directions of each part during a forward rotation of the tidal current turbine 13, and broken line arrows indicate the rotation and flow directions of each part during a reverse rotation of the tidal current turbine 13. As the hydraulic pump 19, a rotary volumetric pump such as a gear pump or a screw pump is used. The hydraulic circuit 25 includes a hydraulic bridge circuit 25b that is formed in a diamond shape, and a check valve 25a is provided on each of four sides of the hydraulic bridge circuit 25b. The hydraulic oil discharged from the hydraulic pump 19 passes through the hydraulic bridge circuit 25b, whereby a flow in one direction is formed from a forward path 30a to a return path 30b via the hydraulic motor 23 even in a case where the tidal current turbine 13 is reversed. A power conversion module Ml that converts tidal current into hydraulic pressure is configured by the tidal current turbine 13, the hydraulic pump 19, the hydraulic circuit 25, and the like.

[0015] In a case where a reciprocating volumetric pump such as a piston pump, a plunger pump, or a diaphragm pump is used as the hydraulic pump 19, a configuration shown in Fig. 3 is adopted. The rotation of the second shaft 17 is transmitted to a crank mechanism 27, causing a piston 29 to reciprocate in a cylinder 28. The hydraulic oil discharged by the hydraulic pump 19 including the piston 29 forms a flow in one direction via check valves 31 provided in each of the forward path 30a and the return path 30b and is guided to the hydraulic motor 23.

[0016] As shown in Fig. 1, the wave power generation facility 7 includes a wave power turbine 33. The wave power turbine 33 is rotated by air that is discharged from a space SI or suctioned into the space SI. The space SI is formed by an outer shell 35 provided on the side of the floating body 3. The outer shell 35 is formed such that an upper portion is fixed to an upper portion of the floating body 3 and a lower portion is submerged in water. The lower portion of the outer shell 35 is open so that seawater can enter. An opening 35a is formed in the upper portion of the outer shell 35, and air enters and exits the space SI from the opening 35a.

[0017] A rotational force of the wave power turbine 33 is transmitted to a third shaft 37 extending in the horizontal direction to drive a hydraulic pump 38. As a result, wave power is converted into power (hydraulic pressure). The hydraulic oil pressurized by the hydraulic pump 38 is guided to the hydraulic motor 23 through a hydraulic pipe 39.

[0018] In the present embodiment shown in Fig. 1, the wave power turbines 33 and the hydraulic pumps 38 are provided on both sides of the floating body 3, respectively. The power conversion module Ml that converts wave power into hydraulic pressure is configured by the respective wave power turbines 33, hydraulic pumps 38, and the like.

[0019] Each hydraulic pipe 39 of the wave power turbines 33 is joined to the hydraulic pipe 21 of the tidal current turbine 13 and is guided to a common hydraulic motor 23. That is, the hydraulic oil pressurized by a plurality of the power conversion modules Ml is collected and guided to the common hydraulic motor 23.

[0020] A volume occupied by air in the space SI varies depending on a period of wave, and accordingly, a direction of air entering and exiting from the opening 35a is reversed. Therefore, a configuration as shown in Fig. 4 is adopted. As shown in Fig. 4, a case where the sea surface WS rises in the space SI is indicated by a solid line arrow, and a case where the sea surface WS descends is indicated by a broken line arrow.

[0021] The wave power turbine 33 on the right side in Fig. 4 rotates in a case where the sea surface WS rises and the air in the space SI is discharged. Specifically, the air discharged from the opening 35a passes through a check valve 40, rotates the wave power turbine 33, and is then released to an outside. The rotational force of the wave power turbine 33 is transmitted to the hydraulic pump 38 via the third shaft 37. In a case where the sea surface WS descends, the air does not flow into the wave power turbine 33 through the check valve 40, and thus the wave power turbine 33 is not reversed.

[0022] The wave power turbine 33 on the left side in Fig. 4 rotates in a case where the sea surface WS descends and air is suctioned into the space SI. Specifically, air is suctioned from the opening 35a, so that outside air flows through the check valve 40 to the wave power turbine 33. Thereby, the wave power turbine 33 rotates, and the rotational force of the wave power turbine 33 is transmitted to the hydraulic pump 38 via the third shaft 37. In a case where the sea surface WS rises, air does not flow into the wave power turbine 33 through the check valve 40, and thus the wave power turbine 33 is not reversed. As described above, hydraulic pressure is generated by any wave power turbine 33 in each of the cases where the sea surface WS rises and descends.

[0023] As shown in Fig. 5, a configuration in which one wave power turbine 33 is used can also be adopted. A plurality of check valves 42 are used to provide a discharged air passage 44a that flows in a discharge direction and a suctioned air passage 44b that flows in a suction direction. A common air passage 44c is used for both of the discharged air passage 44a and the suctioned air passage 44b. By disposing the wave power turbine 33 in the common air passage 44c, air always flows in one direction in the wave power turbine 33.

[0024] As shown in Fig. 1, a generator 24 is connected to the hydraulic motor 23. The hydraulic motor 23 is rotationally driven by hydraulic pressure of the hydraulic oil supplied from the power conversion module Ml, and the generator 24 is rotationally driven by the rotational force of the hydraulic motor 23 to generate power. The hydraulic motor 23 and the generator 24 constitute a power generation module M2 .

[0025] The electricity generated by the generator 24 is sent to a power transmission facility 26 and is transmitted to the outside via a power transmission line 26a. The power transmission facility 26 constitutes a power transmission module M3. In the embodiment shown in Fig. 1, the power generation module M2 and the power transmission module M3 are integrated. However, the power generation module M2 and the power transmission module M3 may be separately provided.

[0026] The power conversion module Ml, the power generation module M2, and the power transmission module M3 are monitored and controlled by a controller (not shown). The controller is composed of, for example, a CPU (Central Processing Unit) , a RAM (Random Access Memory) , a ROM (Read Only Memory) , a computer-readable storage medium, a wired or wireless communication device, and the like. Then, a series of processing for realizing various functions is stored in a storage medium or the like in the form of a program, as an example, and the CPU reads out this program to a RAM or the like, and executes processing for information processing and calculation, whereby various functions are realized. The program may be applied in the form of being, for example, pre-installed in the ROM or another storage medium, provided in a state of being stored in the computer-readable storage medium, or distributed via wired or wireless communication means. The computer-readable storage medium is a magnetic disk, a magneto-optical disk, a CD-ROM, a DVD-ROM, a semiconductor memory, or the like.

[0027] Fig. 6 shows a state in which a plurality of the floating bodies 3 are arranged. In a plan view, the plurality of floating bodies 3 are arranged in a vertical direction and a lateral direction. The power generation module M2 and the power transmission module M3 are provided on one floating body 3 (power generation floating body 3A) . The power conversion modules Ml are provided on other plurality of floating bodies 3 (power conversion floating body 3B). The power generation floating body 3A is not provided with the power conversion module Ml. The power conversion floating bodies 3B are not provided with the power generation module M2 and the power transmission module M3. Therefore, in a configuration shown in Fig. 6, the power generation floating body 3A on which common power generation module M2 and power transmission module M3 are mounted is provided for the plurality of power conversion floating bodies 3B.

[0028] The respective floating bodies 3 are connected to each other to be disconnectable from the other floating body. As a result, each of the floating bodies 3 can be separated from other floating bodies 3.

[0029] As shown in Fig. 1, the solar power generation device 9 is provided on the upper portion of the floating body 3. The solar power generation device 9 includes a solar cell panel 9a, and a space in which the hydraulic pumps 19 and 38, and the like are installed between the solar cell panel 9a and the floating body 3 is formed. Electricity generated by the solar power generation device 9 is sent to the power transmission facility 26. The controller (not shown) controls a power generation output and the like of the solar power generation device 9.

[0030] The actions and effects of the present embodiment described above are as follows. Since each function such as power conversion, power generation, and power transmission is divided for each module Ml, M2, and M3, the power conversion module Ml, the power generation module M2, and the power transmission module M3 can be separately disposed. Accordingly, degree of freedom of a combination of each module Ml, M2, and M3 is increased, and each module Ml, M2, and M3 can be disposed depending on an installation situation in a case where the power generation facility 1 is enlarged by increasing the number of the floating bodies 3, and the like . Since power generated by the plurality of power conversion modules Ml is guided to the common power generation module M2, as compared with a case where power is generated by providing the power generation module M2 corresponding to each power conversion module Ml on a one-to-one basis, the hydraulic motor 23 and the generator 24 can be increased in capacity, and thus a loss during electricity conversion can be reduced, and a power generation efficiency can be increased. The number of power generation modules M2 to be installed can be reduced, and costs for introduction and maintenance can be reduced. Meanwhile, in consideration of a facility operation during a maintenance of the power generation module M2 and the power transmission module M3, a plurality of the power generation modules M2 and a plurality of the power transmission modules M3 can also be installed. Since the floating body 3 does not include a wind power generation device in which an exclusive space is large and an installation cost is high, a utilization efficiency of an installation space (power generation amount per unit space) can be high, and an installation cost can be reduced.

[0031] The solar power generation device 9 is provided with respect to the floating body 3. With this, it is possible to generate power using solar light in addition to power generation using tidal current and wave power, and it is possible to increase a capacity of the power generation facility 1. Since power generation by any natural energy can be expected regardless of day and night, weather, and season, a facility utilization ratio can be kept high. In particular, since tidal current can be predicted with high accuracy for a long term, it is easy to predict a power generation amount and to make a maintenance plan.

[0032] The plurality of power conversion floating bodies 3B in which only the power conversion module Ml is provided on the floating body 3 are provided, and power is supplied from each power conversion floating body 3B to the power generation floating body 3A in which the common power generation module M2 is provided to generate power. As a result, the number of the power conversion floating bodies 3B can be increased to easily cope with scale-up of the power generation facility 1. A plurality of the common power generation floating bodies 3A can also be provided, and are configured by taking into consideration facility scale, reliability, and a maintenance plan.

[0033] Each of the floating bodies 3 is disconnectable from other floating bodies 3. Accordingly, it is possible to continue power generation as the power generation facility 1 by disconnecting only a specific floating body 3 during a maintenance or the like.

[0034] [Second Embodiment] Next, a second embodiment of the present disclosure will be described. The present embodiment is different from the first embodiment in that a structure of the floating body 3, and other configurations are the same. Therefore, in the following description, differences will be mainly described. The same reference numerals will be assigned to common configurations, and description thereof will be omitted.

[0035] Fig. 7 shows a floating body 3' in a plan view. The floating body 3' includes floating body portions 50 on both sides. That is, the floating body 3’ is of a double hull type.

[0036] Each of the floating body portions 50 has a box shape having a space therein and is provided along a longitudinal direction. A plurality of partition walls 52 are provided between the left and right floating body portions 50 in Fig. 7. Each partition wall 52 is formed of a plate-shaped body and extends to connect the left and right floating body portions 50 to each other. Each partition wall 52 is provided at substantially regular intervals at predetermined intervals in the longitudinal direction .

[0037] The left and right floating body portions 50 and the partition walls 52 adjacent to each other in the longitudinal direction form the space SI. As described in the first embodiment, the space SI is used to drive the wave power turbine 33. Therefore, the wave power turbine 33 can be provided in each of the spaces SI. In Fig. 7, the wave power turbine 33 is shown only for two spaces SI, but the wave power turbine 33 may be provided for all the spaces SI.

[0038] As shown in Fig. 8, the wave power turbine 33 is provided in the space SI. The air in the space SI enters and exits between the space SI and the outside through the opening 35a.

[0039] A plurality of the tidal current turbines 13 are provided for each floating body portion 50 such that the second shaft 17 penetrates the floating body portion 50. The number of the tidal current turbines 13 is optional and is appropriately set depending on a required power generation amount.

[0040] As shown in Fig. 9, the floating body 3' shown in Fig. 7 can be plural, and the plurality of floating bodies 3’ can be connected and arranged. The floating bodies 3’ may be arranged in the lateral direction (width direction) as shown in Fig. 9, or floating bodies may be arranged in the vertical direction (longitudinal direction) or the vertical and lateral directions.

[0041] As shown in Figs. 10A and 10B, a keel (rudder) 54 may be provided at a bottom of each floating body portion 50 to protrude downward. In Figs. 10A and 10B, the tidal current turbine 13 and the wave power turbine 33 are omitted. A posture of the floating body 3' can be adjusted by the keel 54 such that the tidal current turbine 13 faces a direction of the tidal current TS.

[0042] As shown in Fig. 11, four points of each corner portion of the floating body 3' in a plan view may be supported by the mooring cable 11, and the mooring cable 11 may be expanded and contracted by a reel (expansion and contraction device) 56 provided at each mooring location on the floating body 3'. By controlling each reel 56 by the controller, the posture of the floating body 3' can be appropriately set depending on the direction of the tidal current TS. In this case, a movement of the floating body 3' can be restrained in a narrower range than in a case of using the keel 54.

[0043] The actions and effects of the present embodiment described above are as follows. The floating body 3’ is a double-hull type floating body by providing the floating body portions 50 on both sides of the floating body 3’ along the longitudinal direction. In addition, the plurality of partition walls 52 extending between the floating body portions 50 are provided in the longitudinal direction. A plurality of the spaces SI in which a volume of gas phase changes according to a change in wave are formed in a region surrounded by the floating body portions 50 on both sides and each partition wall 52. Since power can be obtained from wave power by using the plurality of spaces SI, it is possible to recover a larger amount of energy from wave power .

[0044] Since the keel 54 is provided on the floating body 3', the posture of the floating body 3' can be appropriately controlled depending on the direction of the tidal current TS.

[0045] By expanding and contracting the mooring cable 11 with the reel 56 in accordance with the tidal current TS, the floating body 3' can be given a posture suitable for the direction of the tidal current TS in a narrow range.

[0046] In each of the above-described embodiments, although hydraulic pressure has been described as an example of power to be converted using tidal power and wave power, the power is not limited to hydraulic pressure, and for example, air pressure or the like may be the other power to be converted.

[0047] The power generation facility described in each of the embodiments described above is understood as follows, for example.

[0048] A power generation facility according to one aspect of the present disclosure includes a floating body that is moored and floats on a surface of water, a plurality of power conversion modules that are provided on the floating body and convert tidal current and / or wave power into power, a common power generation module that converts the power guided from each of the power conversion modules into electricity, and a power transmission module that transmits the electricity generated by the power generation module to an outside.

[0049] Since each function such as power conversion, power generation, and power transmission is divided for each module, the power conversion module, the power generation module, and the power transmission module can be separately disposed. Accordingly, degree of freedom of a combination of each module is increased, and each module can be disposed depending on an installation situation, for example, in a case where the power generation facility is enlarged by increasing the number of the floating bodies, and the like. Since power generated by the plurality of power conversion modules is guided to the common power generation module, as compared with a case where power is generated by providing the power generation module corresponding to each power conversion module on a one-to-one basis, a loss during electricity conversion can be reduced, and a power generation efficiency can be increased. The number of power generation modules to be installed can be reduced, and costs for introduction and maintenance can be reduced. The power conversion module has, for example, a function of converting power obtained using tidal current or wave power into hydraulic pressure. It is preferable that the floating body does not include a wind power generation device in which an installation cost is high.

[0050] In the power generation facility according to one aspect of the present disclosure, the floating body includes a solar power generation device.

[0051] The solar power generation device is provided with respect to the floating body. With this, it is possible to generate power using solar light in addition to power generation using tidal current and wave power, and it is possible to increase a capacity of the power generation facility.

[0052] The power generation facility according to one aspect of the present disclosure, further includes a plurality of power conversion floating bodies in which the power conversion module is provided on the floating body, and a power generation floating body in which the power generated by the power conversion module is guided from each of the power conversion floating bodies and the power generation module is provided on the floating body.

[0053] The plurality of power conversion floating bodies are provided, and power is supplied from each power conversion floating body to the common power generation floating body to generate power. As a result, the number of the power conversion floating bodies can be increased to easily cope with scale-up of the power generation facility. A plurality of the power generation floating bodies may also be used. A power transmission module may be provided on the power generation floating body and the power generation floating body may be used as a power generation and transmission floating body.

[0054] In the power generation facility according to one aspect of the present disclosure, the power conversion floating body and the power generation floating body are connected to each other to be disconnectable from the other floating body.

[0055] By making it possible to disconnect each of the floating bodies from other floating bodies, it is possible to continue power generation as the power generation facility by disconnecting only a specific floating body during a maintenance or the like.

[0056] In the power generation facility according to one aspect of the present disclosure, the floating body includes floating body portions provided on both sides along a longitudinal direction, and a plurality of partition walls that extend between the floating body portions and that are provided in the longitudinal direction, and power is obtained from wave power using a plurality of spaces surrounded by each of the floating body portions and each of the partition walls.

[0057] The floating body is a double-hull type floating body by providing the floating body portions on both sides of the floating body along the longitudinal direction. In addition, the plurality of partition walls extending between the floating body portions are provided in the longitudinal direction. A plurality of the spaces in which a volume changes according to a change in wave are formed in a region surrounded by the floating body portions on both sides and each partition wall. Since power can be obtained from wave power by using the plurality of spaces, it is possible to recover a larger amount of energy from wave power.

[0058] In the power generation facility according to one aspect of the present disclosure, the floating body includes a keel.

[0059] The keel is provided on the floating body. Accordingly, a posture of the floating body can be appropriately controlled depending on a direction of tidal current.

[0060] The power generation facility according to one aspect of the present disclosure, further includes a mooring cable that moors the floating body, an expansion and contraction device that expands and contracts the mooring cable, and a controller that controls the expansion and contraction device according to tidal current.

[0061] By expanding and contracting the mooring cable according to tidal current, it is possible to give the floating body a posture suitable for tidal current in a narrow range.

[0062] A power generation method according to one aspect of the present disclosure includes a step of converting tidal current and / or wave power into power by using a plurality of power conversion modules provided on a floating body that is moored and floats on a surface of water, a step of converting the power guided from each of the power conversion modules into electricity by using a common power generation module; and a step of transmitting the electricity generated by the power generation module to an outside by using a power transmission module. Reference Signs List

[0063] 1: power generation facility 3, 3’: floating body 3A: power generation floating body 3B: power conversion floating body 5: tidal current power generation facility 7: wave power generation facility 9: solar power generation device 9a: solar cell panel 11: mooring cable 13: tidal current turbine 15: first shaft 16: bevel gear 17: second shaft 19: hydraulic pump 21: hydraulic pipe 23: hydraulic motor 24: generator 25: hydraulic circuit 25a: check valve 25b: hydraulic bridge circuit 26: power transmission facility 27: crank mechanism 28: cylinder 29: piston 30a: forward path 30b: return path 31: check valve 33: wave power turbine 35: outer shell 35a: opening 37: third shaft 38: hydraulic pump 39: hydraulic pipe 40: check valve 42: check valve 44a: discharged air passage 44b: suctioned air passage 44c: common air passage 50: floating body portion 52: partition wall 54: keel (rudder) 56: reel (expansion and contraction device Ml: power conversion module M2: power generation module M3: power transmission module SI: space TS: tidal current WS: sea surface

Claims

1. A power generation facility comprising:a floating body that is moored and floats on a surface of water;a plurality of power conversion modules that are provided on the floating body and convert tidal current and / or wave power into power;a common power generation module that converts the power guided from each of the power conversion modules into electricity; anda power transmission module that transmits the electricity generated by the power generation module to an outside .

2. The power generation facility according to Claim 1,wherein the floating body includes a solar power generation device.

3. The power generation facility according to Claim 1 or 2, further comprising:a plurality of power conversion floating bodies inwhich the power conversion module is provided on the floating body; anda power generation floating body in which the power generated by the power conversion module is guided from each of the power conversion floating bodies and the power generation module is provided on the floating body.

4. The power generation facility according to Claim 3,wherein the power conversion floating body and the power generation floating body are connected to each other to be disconnectable from the other floating body.

5. The power generation facility according to any one of Claims 1 to 4,wherein the floating body includes floating body portions provided on both sides along a longitudinal direction, and a plurality of partition walls that extend between the floating body portions and that are provided in the longitudinal direction, andpower is obtained from wave power using a plurality of spaces surrounded by each of the floating body portions and each of the partition walls.

6. The power generation facility according to any one of Claims 1 to 5,wherein the floating body includes a keel.

7. The power generation facility according to any one of Claims 1 to 6, further comprising:a mooring cable that moors the floating body;an expansion and contraction device that expands and contracts the mooring cable; anda controller that controls the expansion and contraction device according to tidal current.

8. A power generation method comprising:a step of converting tidal current and / or wave power into power by using a plurality of power conversion modules provided on a floating body that is moored and floats on a surface of water;a step of converting the power guided from each of the power conversion modules into electricity by using a common power generation module; anda step of transmitting the electricity generated by the power generation module to an outside by using a powertransmission module.INTERNATIONAL SEARCH REPORT International application No. PCT / JP2022 / 028082A. CLASSIFICATION OF SUBJECT MATTER F03B 15 / 12(2006.01)1; B63B 35 / 00(2020.01)1 FI: F03B13 / 12; B63B35 / 00 T According to International Patent Classification (IPC) or to both national classification and IPC B. FIELDS SEARCHED Minimum documentation searched (classification system followed by classification symbols) F03B13 / 00-13 / 26; 17 / 00-17 / 0612; B63B 35 / 00 Documentation searched other than minimum documentation to the extent that such documents are included in the fields searched Published examined utility model applications of Japan 1922-1996 Published unexamined utility model applications of Japan 1971-2022 Registered utility model specifications of Japan 1996-2022 Published registered utility model applications of Japan 1994-2022 Electronic data base consulted during the international search (name of data base and, where practicable, search terms used) C. DOCUMENTS CONSIDERED TO BE RELEVANT Category* Citation of document, with indication, where appropriate, of the relevant passages Relevant to claim No. X Y A Y JP 8-35479 A (SUMIZAKI, Norimi) 06 February 1996 (1996-02-06) paragraphs [0001], [0004]-[0006], fig. 1-5 JP 3169982 U (YOKOYAMA, Migaku) 25 August 2011 (2011-08-25) paragraph [0020], fig. 1-4 1,8 2, 5-7 3-4 2, 5-7 Y JP 2014-202175 A (TOYO SEKKEI KOGYO KK) 27 October 2014 (2014-10-27) paragraphs [0004]-[0006], [0028]-[0047], fig. 1-2 5-7 Y JP 2016-205360 A (SANEI CO., LTD.) 08 December 2016 (2016-12-08) paragraph [0023], fig. 10 6-7 Y JP 2011-21559 A (YAMATO DENGYOSHA KK) 03 February 2011 (2011-02-03) paragraphs [0001], [0040]-[0046], fig. 1 7 | | Further documents are listed in the continuation of Box C. | Z | See patent family annex. * Special categories of cited documents: “A” document defining the general state of the art which is not considered to be of particular relevance “E” earlier application or patent but published on or after the international filing date “L” document which may throw doubts on priority claim(s) or which is cited to establish the publication date of another citation or other special reason (as specified) “O” document referring to an oral disclosure, use, exhibition or other means “P” document published prior to the international filing date but later than the priority date claimed “T” later document published after the international filing date or priority date and not in conflict with the application but cited to understand the principle or theory underlying the invention “X” document of particular relevance; the claimed invention cannot be considered novel or cannot be considered to involve an inventive step when the document is taken alone “Y” document of particular relevance; the claimed invention cannot be considered to involve an inventive step when the document is combined with one or more other such documents, such combination being obvious to a person skilled in the ait document member of the same patent family Date of the actual completion of the international search 26 September 2022 Date of mailing of the international search report 04 October 2022 Name and mailing address of the ISA / JP Japan Patent Office (ISA / JP) 3-4-3 Kasumigaseki, Chiyoda-ku, Tokyo 100-8915 Japan Authorized officer Telephone No.INTERNATIONAL SEARCH REPORT Information on patent family members International application No. PCT / JP2022 / 028082Patent document cited in search report Publication date (day / month / year) Patent family member)s) Publication date (day / month / year) JP 8-35479 A 06 February 1996 (Family: none) JP 3169982 U 25 August 2011 CN 202807051 U JP 2014-202175 A 27 October 2014 (Family: none) JP 2016-205360 A 08 December 2016 JP 5879641 Bl JP 2011-21559 A 03 February 2011 (Family: none)

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