Lifting method, photovoltaic unit and airframe

Abstract

To provide a lifting method or the like of a photovoltaic power generation unit.SOLUTION: In the lifting method, the photovoltaic power generation unit 30 is lifted by moving a lifting module 77 to the upper part of the photovoltaic power generation unit 30 to be maintained among a plurality of photovoltaic power generation units 30 arranged on the water, and connecting a plurality of electromagnet devices provided in the lifting module 77 to a magnetic body provided in the photovoltaic power generation unit 30. The lifted photovoltaic power generation unit 30 is transported to the ship 75.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a lifting method, a photovoltaic power generation unit and an airframe. [Background technology]

[0002] A floating solar power generation system has been proposed in which a floating island is moored to a mooring buoy that is moored to the seabed, and multiple floating solar cell panels are connected to the floating island on the surrounding sea surface. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2016-7874 Summary of the Invention [Problem to be solved by the invention]

[0004] In the solar power generation system of Patent Document 1, many solar power generation units, each including a solar power generation panel and a float, are connected around a floating island. In order to operate the solar power generation system stably over a long period of time, maintenance such as replacing or repairing a faulty solar power generation unit is required.

[0005] However, it is difficult to perform appropriate maintenance on the floating solar power generation system of Patent Document 1. To safely perform maintenance on a floating solar power generation system, it is desirable to lift the solar power generation unit requiring maintenance from the sea surface and transport it to the maintenance location.

[0006] One aspect of the present invention aims to provide a method for lifting a solar power generation unit. [Means for solving the problem]

[0007] The lifting method involves moving a lifting module to the top of the solar power generation unit that is to be maintained among multiple solar power generation units arranged on the water, and lifting the solar power generation unit by connecting multiple electromagnetic devices provided on the lifting module to magnetic bodies provided on the solar power generation unit. [Effects of the Invention]

[0008] In one aspect, a method for lifting a solar power generation system can be provided. [Brief explanation of the drawings]

[0009] [Figure 1] FIG. 1 is an explanatory diagram illustrating an outline of maintenance work for a solar power generation system. [Figure 2] FIG. 2 is a perspective view of a solar power generation unit. [Figure 3] FIG. 10 is an explanatory diagram illustrating a method for lifting a solar power generation unit using a lifting module. [Figure 4] FIG. [Figure 5] FIG. 10 is a perspective view of a magnetic body according to Modification 1-1. [Figure 6] FIG. 10 is an explanatory diagram illustrating an outline of maintenance work for a photovoltaic power generation system according to a second embodiment. [Figure 7] FIG. 10 is an explanatory diagram illustrating a method for lifting a photovoltaic power generation unit using the lifting module of the third embodiment. [Figure 8] FIG. 10 is an explanatory diagram illustrating a method for lifting a photovoltaic power generation unit using the lifting module of the fourth embodiment. [Figure 9] FIG. 9 is a cross-sectional view taken along line IX-IX in FIG. 8. [Figure 10] FIG. 10 is an explanatory diagram illustrating a method for lifting a photovoltaic power generation unit using the lifting module of the fifth embodiment. [Figure 11] FIG. 11 is a cross-sectional view taken along line XI-XI in FIG. [Figure 12]FIG. 13 is an explanatory diagram illustrating a method for lifting a photovoltaic power generation unit using the lifting module of the sixth embodiment. [Figure 13] FIG. 13 is an explanatory diagram illustrating the configuration of a lifting module according to a seventh embodiment. [Figure 14] FIG. 4 is an explanatory diagram illustrating the connection of a hoisting machine control line. [Figure 15] FIG. 13 is an explanatory diagram illustrating a maintenance work according to a seventh embodiment. [Figure 16] FIG. 13 is an explanatory diagram illustrating a maintenance work according to a seventh embodiment. [Figure 17] FIG. 13 is a perspective view of a solar power generation unit according to an eighth embodiment. [Figure 18] FIG. 13 is a perspective view of a solar power generation unit according to a ninth embodiment. [Figure 19] FIG. 20 is an explanatory diagram for explaining an outline of maintenance work for a photovoltaic power generation system according to a ninth embodiment. [Figure 20] FIG. 1 is an explanatory diagram illustrating the structure of a scaffolding frame. [Figure 21] 21 is a cross-sectional view taken along the line XXI-XXI in FIG. 20. DETAILED DESCRIPTION OF THE INVENTION

[0010] [Embodiment 1] As part of efforts to protect the Earth from climate change caused by global warming, the use of renewable energy sources with low carbon dioxide emissions is being encouraged. Furthermore, in order to supply cheap and safe electrical energy to everyone, it is preferable for electricity generated by large-scale power generation facilities to be provided to consumers via the power grid, rather than for individual consumers such as ordinary households to own small-scale power generation facilities.

[0011] Solar power generation is one type of renewable energy. In Japan, the FIT (Feed-in Tariff) system, a fixed price purchase system for renewable energy, was launched in July 2012. The FIT system is a system in which the government guarantees that electric power companies will purchase electricity generated from renewable energy sources at a fixed price for a set period of time. Since the introduction of the FIT system, many power generation facilities using renewable energy, including solar power generation facilities, have been installed in Japan.

[0012] According to statistics from fiscal 2019, Japan has the world's highest solar power generation capacity per land area. However, in recent years, a shortage of land for installing new solar power generation facilities has become a problem. For example, there has been consideration of using farmland that has fallen into disuse as a site for solar power generation facilities, but the high cost of developing abandoned farmland that has turned into forest has become a problem.

[0013] Large-scale solar power generation facilities are sometimes installed on sloping land to effectively utilize the land. Solar power generation facilities are expected to improve power generation efficiency by being installed on a south-facing slope. However, it is known that solar power generation facilities installed on sloping land pose a risk of increasing the risk of disasters such as landslides during bad weather.

[0014] The flat land at the bottom of a slope is often used for residential areas, etc. In order to realize sustainable urban development where people living in such residential areas can continue to live safely, it is desirable to install solar power generation facilities in locations other than on slopes.

[0015] Furthermore, solar power generation facilities affected by landslides will be unable to generate electricity until repairs are completed. Depending on the severity of the landslide, repairs may have to be abandoned. In order to create a sustainable, disaster-resistant power infrastructure, it is desirable to install solar power generation facilities in locations other than on sloping ground.

[0016] The solar power generation system disclosed in Patent Document 1, which combines a floating island with floating solar panels, can eliminate the drawbacks of solar power generation systems installed on sloping ground. However, in order to realize a high-quality, reliable, sustainable, disaster-resistant infrastructure using a solar power generation system installed on the sea, maintenance such as prompt replacement of broken parts is necessary.

[0017] In light of the above circumstances, in this embodiment, a maintenance method for a photovoltaic power generation system installed on the surface of water such as the sea surface or the surface of a lake will be described. Fig. 1 is an explanatory diagram illustrating an outline of maintenance work for a photovoltaic power generation system.

[0018] A solar cell array 14 is arranged on the water surface. The solar cell array 14 includes a number of solar power generation units 30 floating on the water. Details of the solar power generation units 30 will be described later.

[0019] In this embodiment, the power generated by each solar power generation unit 30 is transmitted to the ground or to a power relay device (not shown) by wireless power transmission. The solar power generation units 30 and a control system (not shown) are connected by wireless communication.

[0020] That is, the solar power generation units 30 constituting the solar cell array 14 of this embodiment are not connected by power cables, communication cables, etc. An anti-flow net (not shown) is arranged around the solar cell array 14 to prevent the solar power generation units 30 from being carried away. The solar power generation units 30 may be moored to the seabed by mooring lines (not shown).

[0021] 1 shows an example of a solar cell array 14 in which solar power generation units 30 are arranged in a substantially rectangular shape. For example, in a solar cell array 14 with an output of 1 megawatt or more, known as a mega solar array, the solar power generation units 30 are arranged in an area of ​​approximately 100 meters in length and 300 meters in width.

[0022] The solar cell array 14 may be surrounded by, for example, a substantially circular runoff prevention net, and the solar power generation units 30 may be arranged in a substantially circular area.

[0023] As mentioned above, each solar power generation unit 30 is connected to the control system via wireless communication. For example, information such as the amount of power generated is transmitted to the control system as needed. If a malfunction occurs in a solar power generation unit 30, such as a decrease in the amount of power generated by a particular solar power generation unit 30, two maintenance vessels 75 are dispatched to the solar cell array 14.

[0024] The maintenance vessels 75 are connected to each other by gondola wires 761. A lifting module 77 is suspended from the gondola wires 761. The configuration of the lifting module 77 will be described in detail later. The maintenance vessels 75 are maneuvered so that the solar cell array 14 is sandwiched between the two maintenance vessels 75.

[0025] Figure 2 is a perspective view of a solar power generation unit 30. The solar power generation unit 30 includes a solar cell panel 31, a frame portion 33, and a float 35. The four sides of the approximately square solar cell panel 31 are surrounded by the frame portion 33. The frame portion 33 is dish-shaped or frame-shaped with a recess that corresponds to the outer shape of the solar cell panel 31, and functions as a reinforcing material to prevent damage to the solar cell panel 31 due to external forces. The frame portion 33 is made of resin, and magnetic materials 34 (see Figure 3) are embedded in the four corners.

[0026] The float 35, with its substantially square bottom surface facing upward, is a block of substantially quadrangular pyramid shape formed integrally using, for example, foamed resin with numerous closed cells dispersed therein. The solar cell panel 31 is fixed to the bottom surface of the float 35 via a frame portion 33. The float 35 and the frame portion 33 do not need to be in close contact with each other, and a gap may be provided between them.

[0027] The float 35 may be in the form of a shell having a cavity. The shell-like portion is made of, for example, FRP (Fiber Reinforced Plastics). The inside of the cavity is filled with a gas such as air or nitrogen. The cavity may also be filled with foamed resin.

[0028] The float 35 is a container-type float with an opening at the top, and the frame 33 and the solar panel 31 may function as a lid that watertightly closes the opening. The float 35 may have an air chamber filled with gas inside.

[0029] A position indicator 331 is provided on the upper surface of the frame portion 33. The position indicator 331 is an indicator that indicates the position of the magnetic body 34. If the float 35 is semi-transparent and the magnetic body 34 can be seen from the outside, the magnetic body 34 may also serve as the position indicator 331. The position indicator 331 may be provided on the side surface of the float 35.

[0030] The solar power generation unit 30 has an upper surface that is roughly square, measuring, for example, 2 meters in length and width, and the length of the perpendicular line connecting the upper surface to the apex of the float 35 is approximately 80 centimeters. However, the dimensions of the solar power generation unit 30 are not limited to those described above.

[0031] 3 is an explanatory diagram illustrating a method for lifting a solar power generation unit 30 using a lifting module 77. The lifting module 77 includes a gondola 78 attached to one location on a gondola wire 761, and four electromagnet devices 790. The electromagnet device 790 includes an electromagnet 791 and an electromagnet wire 792. The electromagnet 791 is suspended from the bottom of the gondola 78 by the electromagnet wire 792. The bottom of the gondola 78 is an example of a support from which the electromagnet device 790 is suspended. The electromagnet wire 792 is usually wound up in a short length.

[0032] The maintenance person gets on the gondola 78. The crew of the maintenance ship 75 operates a wire hoist (not shown) to wind up the gondola wire 761 and move the gondola 78 along the gondola wire 761. Furthermore, the position of the gondola wire 761 is adjusted by maneuvering the maintenance ship 75. Through the above operations, the gondola 78 is positioned above the solar power generation unit 30 to be maintained.

[0033] The maintenance technician visually checks the condition of the solar power generation unit 30. If it is determined that replacement or repair is necessary, the maintenance technician operates the electromagnet wire 792 to bring the electromagnet 791 closer to the top surface of the solar power generation unit 30. The maintenance technician uses the position indicator 331 as a guide to bring the electromagnet 791 closer to the magnetic material 34. The maintenance technician supplies power to the electromagnet 791, causing the electromagnet 791 to attract the magnetic material 34.

[0034] The maintenance technician then winds up the electromagnet wire 792 and lifts up the solar power generation unit 30 that is the target of maintenance. When the bottom of the solar power generation unit 30 is sufficiently above the water surface, the crew of the maintenance ship 75 operates the gondola wire 761 to transport the solar power generation unit 30 to the maintenance ship 75. Inspection and repair of the solar power generation unit 30 are carried out on board the ship. After repairs are complete, the solar power generation unit 30 or a replacement solar power generation unit 30 is lifted by the electromagnet 791 and transported to the sea surface.

[0035] Instead of a maintenance person, a master-slave type manipulator may be loaded onto the gondola 78. The maintenance person can operate the manipulator from inside the maintenance vessel 75 or from land. The manipulator may be configured integrally with the gondola 78.

[0036] Instead of a maintenance person, an autonomous robot having an electromagnetic device 790 may automatically perform work such as lifting the solar power generation unit 30. Instead of the lifting module 77, a robot may be attached to one point on the gondola wire 761.

[0037] 4 is a perspective view of the magnetic body 34. The magnetic body 34 includes a disk-shaped plate-like portion 341 and two retaining portions 342 extending obliquely from one surface of the plate-like portion 341. The retaining portions 342 and the plate-like portion 341 are not perpendicular to each other, and the two retaining portions 342 are not parallel to each other.

[0038] The plate-shaped portion 341 is made of a ferromagnetic material such as iron. The retaining portion 342 may be made of the same material as the plate-shaped portion 341 or a different material. The retaining portion 342 may be made of a non-magnetic material. As shown by the dashed line in FIG. 3 , the plate-shaped portion 341 is embedded inside the frame portion 33 with the retaining portion 342 facing downward. In other words, the magnetic material 34 is not exposed on the surface of the solar power generation unit 30. This makes it possible to realize a solar power generation unit 30 in which the magnetic material 34 is less susceptible to rust and the like. The plate-shaped portion 341 is arranged parallel to the top surface of the solar power generation unit 30.

[0039] The retaining portions 342 and the plate-shaped portion 341 are not perpendicular, and the two retaining portions 342 are not parallel to each other, so when the photovoltaic power generation unit 30 is lifted by the electromagnet 791, the magnetic body 34 is prevented from coming off the frame portion 33, which would cause the photovoltaic power generation unit 30 to fall. In other words, the retaining portions 342 function to prevent the magnetic body 34 from coming off the frame portion 33.

[0040] In addition, Figure 3 shows an example in which the spacing between the anti-slip portions 342 increases as they move away from the plate-shaped portion 341, but conversely, the spacing between the anti-slip portions 342 may be configured to decrease as they move away from the plate-shaped portion 341.

[0041] According to this embodiment, it is possible to provide a maintenance method in which any solar power generation unit 30 is lifted and stored on a maintenance ship 75. Therefore, maintenance personnel can perform work such as inspection and repair of the solar power generation unit 30 on the maintenance ship 75. For example, the maintenance work can be performed more safely than when the maintenance work is performed on a gondola 78.

[0042] According to this embodiment, a maintenance method can be provided in which an arbitrary photovoltaic power generation unit 30 is lifted and replaced with a photovoltaic power generation unit 30 mounted on a maintenance vessel 75.

[0043] Even if there is no particular abnormality in the solar power generation unit 30, the maintenance ship 75 may be dispatched for regular inspection of the solar cell array 14. If an abnormality or a sign of an abnormality is discovered during the regular inspection, a maintenance method can be provided that allows for prompt repair or replacement of the solar power generation unit 30.

[0044] The top surface of the solar power generation unit 30 may have any shape, such as a hexagon or a circle. The number of magnetic bodies 34 embedded in the frame portion 33 may be any number equal to or greater than three. The number of magnetic bodies 34 embedded in one solar power generation unit 30 may be different from the number of electromagnets 791 provided in the lifting module 77.

[0045] [Variation 1-1] 5 is a perspective view of the magnetic body 34 of Modification 1-1. The magnetic body 34 includes a disk-shaped plate-like portion 341 and a retaining portion 342 having a generally truncated conical surface shape that protrudes from one surface of the plate-like portion 341. The diameter of the retaining portion 342 increases with increasing distance from the plate-like portion 341. A plurality of anchor holes 343 are formed in the retaining portion 342.

[0046] In this modified example, the magnetic body 34 is also embedded inside the frame part 33 with the retaining portion 342 facing downward. For example, when the frame part 33 with the embedded magnetic body 34 is created by integral molding of resin, the resin also enters the inside of the anchor hole 343, so that the solar power generation unit 30 can be realized in which the magnetic body 34 and the float 35 are firmly bonded.

[0047] [Variation 1-2] The solar power generation units 30 may be connected to each other by a power cable. The power generated by each solar cell panel 31 is transmitted to the ground or to a power relay device (not shown) via the power cable. Since there is no loss due to wireless power transmission, a solar cell array 14 with high power generation efficiency can be provided.

[0048] It is desirable to provide a signal line integral with or along the power cable, so that maintenance personnel can determine whether maintenance work is necessary based on data such as the amount of power generated that is sequentially transmitted to the control device via the signal line.

[0049] When the solar power generation units 30 are connected to each other by a power cable, the solar power generation units 30 are also connected to each other by a connector 37 (see FIG. 19) such as a rope, chain, or wire. The power cable and the connector 37 may be integrally configured.

[0050] When the solar power generation units 30 become separated from each other due to waves or the like, the connectors 37 are stretched ahead of the power cables to prevent the solar power generation units 30 from separating too far from each other and to prevent a large tension from being applied to the power cables.

[0051] When the solar power generation units 30 are connected to each other by power cables and connectors 37, before lifting the solar power generation unit 30, the maintenance personnel will remove the solar power generation unit 30 to be lifted from the surrounding solar power generation units 30 and connect the replaced solar power generation unit 30 to the surrounding solar power generation units 30.

[0052] A specific example of the structure of the solar power generation unit 30 that allows the connector 37 to be easily attached and detached will be described later.

[0053] [Embodiment 2] This embodiment relates to a maintenance method using a crane ship as a maintenance ship 75. Explanation of parts common to the first embodiment will be omitted.

[0054] 6 is an explanatory diagram illustrating an outline of maintenance work for a photovoltaic power generation system according to embodiment 2. In this embodiment, a maintenance ship 75 is a crane ship having a boom 762. A crane wire 763 is stretched on the boom 762. A lifting module 77 is suspended from the tip of the crane wire 763.

[0055] The crane operator operates the boom 762 and crane wire 763 to move the lifting module 77 to above the solar power generation unit 30 requiring maintenance work. If the length of the boom 762 is insufficient, the maintenance ship 75 is moved to an appropriate position. The lifting module 77 includes a gondola 78 and an electromagnet device 790. The electromagnet device 790 lifts the solar power generation unit 30.

[0056] According to this embodiment, a maintenance method that allows work to be performed using a single maintenance ship 75 can be provided.

[0057] [Embodiment 3] This embodiment relates to a maintenance method that uses a balance beam 793 instead of a gondola 78. Explanation of parts common to the second embodiment will be omitted.

[0058] 7 is an explanatory diagram illustrating a method for lifting a photovoltaic power generation unit 30 using a lifting module 77 according to the third embodiment. The lifting module 77 according to the present embodiment includes a balance beam 793 and an electromagnetic device 790 attached near both ends of the balance beam 793. The balance beam 793 is attached to the tip of the crane wire 763. The balance beam 793 is an example of a support from which the electromagnetic device 790 is suspended.

[0059] The electromagnet device 790 can switch the electromagnet 791 between an on state and an off state by wired control. A power line for the electromagnet 791 (not shown) is stretched along the boom 762, crane wire 763, balance beam 793, and electromagnet wire 792. Each electromagnet 791 is turned on when power is supplied from the power line, and turned off when the power supply is stopped.

[0060] The crane operator operates the boom 762 to bring the electromagnets 791 close to the tops of two diagonally arranged position indicators 331 out of the four position indicators 331 described using FIG. 2. The crane operator turns on the electromagnets 791 and lifts up the solar power generation unit 30. Therefore, when lifting up, the balance beam 793 is approximately parallel to the diagonal line drawn on the top surface of the solar power generation unit 30.

[0061] According to this embodiment, since the lifting module 77 does not include a gondola 78 and is lightweight, a maintenance method can be provided that makes it easy to maintain the maintenance vessel 75 in a stable state even when the boom 762 is extended to a long length.

[0062] [Embodiment 4] This embodiment relates to a maintenance method that makes it difficult for the electromagnet 791 to vibrate. Explanation of parts common to the first embodiment will be omitted.

[0063] Fig. 8 is an explanatory diagram illustrating a method for lifting a solar power generation unit 30 using a lifting module 77 according to the fourth embodiment. Fig. 9 is a cross-sectional view taken along line IX-IX in Fig. 8. Explanations of parts common to the first embodiment will be omitted.

[0064] The lifting module 77 of this embodiment includes a gondola 78, a frame 795, and an electromagnet 791. As shown in Fig. 9 , the frame 795 is a frame having a shape of a substantially square that is slightly smaller than the top surface of the solar power generation unit 30 and has two diagonal lines added to it.

[0065] Frame 795 is suspended from the underside of gondola 78 by four frame suspenders 794. Electromagnets 791 are attached to the four corners of the underside of frame 795. That is, in this embodiment, electromagnet device 790 does not include electromagnet wire 792, and electromagnet 791 fulfills the function of electromagnet device 790. Photovoltaic power generation unit 30 is lifted by electromagnet 791. Frame 795 and electromagnet 791 are firmly fixed together by, for example, bolting, welding, or adhesive bonding. Frame 795 is an example of a support from which electromagnet 791 is suspended.

[0066] According to this embodiment, the electromagnets 791 are less likely to vibrate because the electromagnet wire 792 is not used. Therefore, it is possible to simultaneously attach the four electromagnets 791 to the solar power generation unit 30, thereby reducing the time required for the work.

[0067] Note that a hook may be provided on electromagnet 791 and an eye may be provided on frame 795, and electromagnet 791 may be attached to frame 795 by hooking the hook onto the eye. A lifting module 77 that allows electromagnet 791 to be easily replaced can be realized.

[0068] [Embodiment 5] This embodiment relates to a maintenance method capable of simultaneously lifting a plurality of photovoltaic power generation units 30. Explanation of parts common to the fourth embodiment will be omitted.

[0069] Fig. 10 is an explanatory diagram illustrating a method for lifting the solar power generation unit 30 using the lifting module 77 according to the fifth embodiment. Fig. 11 is a cross-sectional view taken along line XI-XI in Fig. 10 .

[0070] The lifting module 77 of this embodiment includes a gondola 78, a frame 795, and an electromagnet 791. As shown in Fig. 11, the frame 795 is a frame having a shape in which three roughly square shapes, each slightly smaller than the top surface of the solar power generation unit 30 and with two diagonal lines added, are lined up and connected in a row.

[0071] Frame 795 is suspended by four frame hangers 794 that connect the edge of the roughly square portion in the center to the underside of gondola 78. Electromagnets 791 are attached to the four corners of the underside of each square portion that makes up frame 795. In this embodiment, electromagnet device 790 does not include electromagnet wire 792, and electromagnet 791 fulfills the function of electromagnet device 790.

[0072] Three solar power generation units 30 are lifted at once by the electromagnets 791. That is, a number of electromagnet devices 790 are suspended from the frame 795 such that multiple solar power generation units 30 can be suspended simultaneously.

[0073] According to this embodiment, it is possible to provide a maintenance method that allows multiple photovoltaic power generation units 30 to be lifted simultaneously.

[0074] The solar power generation units 30 that are lifted at the same time may be connected to each other to form a block, and the wireless power transmission device and the communication device may be arranged in each block.

[0075] [Embodiment 6] This embodiment relates to a lifting module 77 in which an electromagnet hoisting tool 796 is disposed between a frame 795 and an electromagnet 791. Explanation of parts common to the fifth embodiment will be omitted.

[0076] 12 is an explanatory diagram illustrating a method for lifting a photovoltaic power generation unit 30 using the lifting module 77 of the sixth embodiment. In this modification, an electromagnet 791 is suspended from a frame 795 via an electromagnet suspender 796. The electromagnet suspender 796 is in the form of a belt with an eye attached to its tip. The upper part of the electromagnet 791 is hook-shaped and is hooked onto the eye of the electromagnet suspender 796. Alternatively, an eye may be provided at the upper part of the electromagnet 791, and a hook may be provided at the lower end of the electromagnet suspender 796.

[0077] According to this modification, a lifting module 77 in which the electromagnet 791 can be easily replaced can be realized.

[0078] [Embodiment 7] This embodiment relates to a lifting module 77 equipped with an electromagnetic hoisting tool 796 that can move up and down. Explanation of parts common to the first embodiment will be omitted.

[0079] 13 is an explanatory diagram illustrating the configuration of the lifting module 77 according to the seventh embodiment. The frame 795 is suspended by a crane wire 763. Along the crane wire 763, a hoisting machine control line 83 is arranged.

[0080] On the frame 795, twelve hoists 81, the same number as the electromagnets 791, and one control box 82 are arranged. The control box 82 houses a large-capacity storage battery and a communication control device.

[0081] 13, six hoists 81 are visible on the front side of the page. The remaining six hoists 81 are arranged behind the hoists 81 on the front side. Each hoist 81 is connected to one electromagnet hoist 796.

[0082] On the underside of the frame 795, a sensor 84 is disposed in the center of four electromagnetic hoisting devices 796 used to hoist one solar power generation unit 30. That is, a total of three sensors 84 are disposed on the underside of the frame 795. The sensors 84 are, for example, distance measurement sensors or cameras.

[0083] Fig. 14 is an explanatory diagram illustrating the connection of the hoist control wire 83. In Fig. 14, the frame 795 is enlarged in the thickness direction to schematically show the wiring of the hoist control wire 83. The sensor 84, the electromagnet hoisting tool 796, the electromagnet 791, and the crane wire 763 are not shown.

[0084] An end of a hoisting machine control line 83 arranged along the crane wire 763 is connected to a control box 82. The opposite end, not shown, is connected to a control panel operated by a maintenance technician. The control box 82 is connected to each hoisting machine 81 via a hoisting machine connection line 85. The control box 82 supplies power from a built-in large-capacity storage battery to the hoisting machines 81 via the hoisting machine connection line 85 to operate them.

[0085] Returning to Figure 13, the following explanation will be given taking as an example a case where the maintenance person also serves as the crane operator. Note that the maintenance person and the crane operator may be different people, and may cooperate to carry out the work described below.

[0086] The maintenance person operates the boom 762 and the crane wire 763 to move the lifting module 77 to the top of the solar power generation unit 30 that requires maintenance work. If the length of the boom 762 is insufficient, the maintenance ship 75 is moved to an appropriate position.

[0087] In the following description, the image captured by the sensor 84 or information regarding the distance to the solar power generation unit 30 is displayed on a control panel used by a maintenance technician via a communication control device built into the control box 82. The maintenance technician moves the lifting module 77 to an appropriate position by referring to the display on the control panel.

[0088] 13, an example will be described in which maintenance is performed on the central solar power generation unit 30 among three solar power generation units 30 floating on the sea surface. The maintenance technician confirms that the four electromagnets 791 arranged in the center of the frame 795 are positioned above the magnetic body 34 built into the solar power generation unit 30 that is the target of maintenance. The maintenance technician then operates the control panel to lower the four electromagnets 791 arranged in the center of the frame 795.

[0089] 15 is an explanatory diagram illustrating the maintenance work of the seventh embodiment. Based on the operation of the maintenance technician, the control box 82 controls the target hoisting machine 81 to extend the electromagnet hoisting device 796. The maintenance technician confirms that each of the four electromagnets 791 is close to the magnetic material 34, as shown in FIG. 15A. The maintenance technician then supplies power to the electromagnets 791, causing the electromagnets 791 to attract the magnetic material 34.

[0090] The maintenance person operates the control panel to return the lowered electromagnet 791 to its original height. Based on the operation of the maintenance person, the control box 82 controls the corresponding hoisting machine 81 to hoist the electromagnet hoisting device 796 to its original length. The state after hoisting is completed is shown in Figure 15B. The central solar power generation unit 30 is hoisted by the lifting module 77.

[0091] Fig. 16 is an explanatory diagram illustrating the maintenance work of the seventh embodiment. As shown in Fig. 16, a maintenance person operates a boom 762 and a crane wire 763 to move a lifting module 77 to above another solar power generation unit 30 that requires maintenance work. The solar power generation unit 30 lifted in Fig. 15 is at a higher position than the solar power generation unit 30 floating on the sea, and therefore the two do not come into contact with each other, as shown in Fig. 16.

[0092] 16B, the maintenance person performs the same operation as described using FIG. 15 to attract the magnetic body 34 to the four electromagnets 791 on the right side. By repeating the above operation, up to three solar power generation units 30 are lifted onto the lifting module 77. The three solar power generation units 30 are simultaneously transported to the maintenance ship 75.

[0093] According to this embodiment, it is possible to provide a lifting module 77 that can lift up even when the photovoltaic power generation units 30 requiring maintenance are dispersed.

[0094] [Embodiment 8] If the solar cell panel 31 becomes dirty due to bird droppings and falling feathers, etc., the power generation efficiency will decrease. If a bird pecks at the solar cell panel 31 with its beak, the solar cell panel 31 may be damaged. If many birds land on the solar cell panel 31, the solar cell power generation unit 30 may sink. This embodiment relates to a solar cell power generation unit 30 that can prevent such bird damage. Explanation of parts common to embodiment 1 will be omitted.

[0095] 17 is a perspective view of a solar power generation unit 30 according to an eighth embodiment. A reflector 333 is disposed on the edge of the top surface of the solar power generation unit 30, i.e., on the upper surface of the frame portion 33, excluding the position indicator 331. The reflector 333 has a configuration in which small reflective surfaces facing in various directions are closely arranged. When the solar power generation unit 30 sways on the sea surface, the reflected light sparkles irregularly, which warns birds away and keeps them away.

[0096] A visually distinguishable reflector 333 or the like of a different color may be arranged in the portion of the position indicator 331. A reflector 333 may also be arranged on the side surface of the frame portion 33.

[0097] According to this embodiment, it is possible to provide a solar power generation unit 30 that can prevent bird damage.

[0098] [Embodiment 9] This embodiment relates to a maintenance method for a solar cell array 14 in which adjacent solar power generation units 30 are physically connected to each other. Explanation of parts common to the first embodiment will be omitted.

[0099] 18 is a perspective view of a solar power generation unit 30 according to embodiment 9. The solar power generation unit 30 of this embodiment includes two fixtures 36 protruding from each side surface of a frame portion 33. The fixtures 36 are substantially semicircular plates with one through-hole.

[0100] Fig. 19 is an explanatory diagram outlining the maintenance work for the solar power generation system according to the ninth embodiment. Fig. 19 schematically shows the structure of the solar cell array 14. Each solar power generation unit 30 constituting the solar cell array 14 is connected to an adjacent solar power generation unit 30 by two connectors 37. The connectors 37 are, for example, a rope, chain, or wire with carabiner-like hooks on both ends, and each hook is connected to a mounting fixture 36.

[0101] The connector 37 may be, for example, a composite cable in which a power cable and a communication cable are integrated with a rope, chain, or wire serving as a strength member. When the connector 37 includes a power cable, the power generated by the solar panel 31 is transmitted to the ground or to a power relay device (not shown) via the power cable. When the connector 37 includes a communication cable, information such as the amount of power generated by the solar panel 31 is transmitted to the control device as needed.

[0102] Apart from the connector 37, a power cable and a communication cable may be connected to the solar power generation unit 30. For example, the frame portion 33 may be provided with a connector to which the power cable is connected and a connector to which the communication cable is connected.

[0103] Since the solar power generation units 30 are connected to each other with connectors 37, it is not possible to lift up the solar power generation units 30 that require maintenance in this state. A maintenance worker can install a strip-shaped scaffolding frame 41 across the top surfaces of the multiple solar power generation units 30.

[0104] FIG. 20 is an explanatory diagram illustrating the structure of the scaffolding frame 41. The scaffolding frame 41 includes a base frame 411, side frames 412, and ropes 413. The base frame 411 is strip-shaped with a uniform width. The side frames 412 are attached to both edges along the longitudinal direction of the base frame 411. The two side frames 412 are attached to the surface opposite the solar power generation unit 30. A restoring structural material 86 is arranged inside the side frames 412.

[0105] The rope 413 is fixed at multiple locations to the side frame 412. A safety harness worn by a maintenance worker can be connected to the rope 413.

[0106] Both the base frame 411 and the side frames 412 are connected to nozzles that allow air to be injected and discharged. The bottom of Figure 20 shows a cross section of the scaffolding frame 41 inflated by injecting air through the nozzles. Each side frame 412 includes one airtight compartment that can be filled with air. The side frames 412 are made of a thicker material than the base frame 411.

[0107] The base frame 411 includes four airtight compartments that can be filled with air. Therefore, even if one airtight compartment is damaged, the other three airtight compartments remain inflated. In other words, the base frame 411 and side frames 412 that make up the scaffolding frame 41 have an airtight structure that maintains an inflated state when filled with air, and are so-called air frames that can be deflated as needed.

[0108] Fig. 21 is a cross-sectional view taken along line XXI-XXI in Fig. 20. Although the base frame 411 is not shown in Fig. 21, the length of the base frame 411 is substantially the same as the length of the side frame 412.

[0109] The recovery structural material 86 is a strip-like member that extends the entire length of the side frame 412 and is fixed to the inner surface of the side frame 412. The recovery structural material 86 is made of an elastic material such as spring steel or a shape memory alloy. In its natural state, the recovery structural material 86 is curled up in a spiral shape.

[0110] Returning to FIG. 19 , the explanation will continue. When the scaffolding frame 41 is deflated, it is rolled up as shown in FIG. 19 . A maintenance person gets on a gondola 78 suspended from a boom 762 of a maintenance vessel 75, for example, and goes near the solar power generation unit 30. The maintenance person moves the rolled scaffolding frame 41 from the gondola 78 to the edge of the solar power generation unit 30. Note that the rolled scaffolding frame 41 may be transported by a crane separate from the crane that moves the gondola 78.

[0111] The maintenance person injects air into each nozzle of the scaffolding frame 41. As the base frame 411 and the side frames 412 inflate, the scaffolding frame 41 assumes a generally U-shaped gutter shape that extends across the top surfaces of the multiple solar power generation units 30. This creates a scaffold that the maintenance person can walk on.

[0112] The maintenance person moves onto the scaffolding frame 41 and connects a safety harness to the rope 413 to prevent falls. Therefore, the maintenance person can safely perform the work of removing the connectors 37 connected to the solar power generation unit 30 that requires maintenance. In addition to the connectors 37, if power cables and communication cables are connected to the solar power generation unit 30, the maintenance person also performs the work of removing these cables.

[0113] The solar power generation unit 30 from which the connector 37 has been removed is lifted up using the procedure described in the first embodiment and replaced with a replacement solar power generation unit 30. The maintenance technician connects the connector 37 to the replacement solar power generation unit 30. If a power cable and a communication cable are connected to the solar power generation unit 30 in addition to the connector 37, the maintenance technician also connects these cables.

[0114] After completing the replacement work of the solar power generation unit 30, the maintenance worker transfers to the gondola 78. Then, the maintenance worker releases the air from the nozzle. The base frame 411 and the side frame 412 contract. As the shape of the restoring structural material 86 returns to its natural state, the scaffolding frame 41 naturally returns to its rolled shape. The maintenance worker places the scaffolding frame 41 on the gondola 78. Then, the maintenance worker returns to the maintenance ship 75. Note that the scaffolding frame 41 may be transported by a crane separate from the crane that moves the gondola 78.

[0115] According to this embodiment, even in the solar cell array 14 in which adjacent solar power generation units 30 are connected to each other by connectors 37, a maintenance method can be provided in which each solar power generation unit 30 is lifted up and repaired or replaced.

[0116] Since the scaffolding frame 41 is a lightweight and flexible air frame, even when it is placed on top of the solar power generation unit 30, it is unlikely to cause damage to the solar power generation unit 30, such as cracking of the solar cell panel 31.

[0117] By using the scaffolding frame 41, even when a solar power generation unit 30 located near the center of the solar cell array 14 is subject to maintenance, it is possible to provide a solar cell array 14 in which only that solar power generation unit 30 can be lifted by separating it from the surrounding solar power generation units 30.

[0118] Since the side frames 412 are made of a thick material, it is possible to provide a scaffolding frame 41 that safely holds the rope 413 and safety harness.

[0119] Since adjacent solar power generation units 30 are connected to each other, it is possible to provide a solar cell array 14 in which the solar power generation units 30 are less likely to capsize even when the waves are rough.

[0120] The technical features (constituent elements) described in each embodiment can be combined with each other, and by combining them, new technical features can be formed. The embodiments disclosed herein are to be considered as illustrative in all respects and not restrictive. The scope of the present invention is defined by the claims, not by the above meaning, and is intended to include all modifications within the meaning and scope of the claims.

[0121] Independent and dependent claims may be combined with each other in any combination, regardless of the reference format. Furthermore, while the claims are written in a format in which a claim references two or more other claims (multiple claim format), this is not a limitation. Multiple claims that reference at least one other claim (multiple multiple claim format) may also be written. [Explanation of symbols]

[0122] 14 Solar array 30 solar power generation units 31 Solar Panel 33 Frame section 331 Position index 333 Reflector 34 Magnetic material 341 Plate-shaped part 342 Retaining part 343 Anchor hole 35 Float 36 Mounting fixture 37 Connectors 41 Scaffolding Frame 411 base frame 412 Side Frame 413 Rope 75 Maintenance Ship (Ship) 761 Gondola Wire 762 Boom 763 Crane Wire 77 Lifting Module 78 Gondola 790 Electromagnetic device 791 Electromagnet 792 Electromagnet Wire 793 Balance rod 794 Frame Lifting Device 795 frames 796 Electromagnetic hanging tool 81 Hoisting machine 82 Control Box 83 Hoisting machine control line 84 sensors 85 Hoisting machine connection line 86 Restoration structural materials

Claims

1. A lifting module is moved to the top of the solar power generation unit that is the maintenance target among multiple solar power generation units arranged on the water, The solar power generation unit is lifted by connecting a plurality of electromagnetic devices provided in the lifting module to a magnetic body provided in the solar power generation unit. Lifting method.

2. The lifted solar power generation unit is transported to the ship.

2. The lifting method of claim 1.

3. the lifting module comprises a support; The plurality of electromagnetic devices are each suspended from the support.

2. The lifting method of claim 1.

4. The support includes a gondola 4. The lifting method according to claim 3.

5. the support includes a frame; The plurality of electromagnetic devices are each suspended from the frame.

4. The lifting method according to claim 3.

6. The frame is hung with a number of the electromagnetic devices that allows multiple solar power generation units to be hung at the same time.

6. The lifting method according to claim 5.

7. Each electromagnet device can move up and down independently. With the electromagnet device lowered, the electromagnet device and the solar power generation unit are attached and detached.

7. The lifting method of claim 6.

8. The magnetic body is a plate-shaped portion disposed parallel to a top surface of the solar power generation unit; a retaining portion extending obliquely from the lower surface of the plate-shaped portion, embedded in the solar power generation unit 2. The lifting method of claim 1.

9. The solar power generation unit includes a position indicator that indicates the position of the magnetic body.

2. The lifting method of claim 1.

10. An air frame that can be filled with air is installed across the top surfaces of the plurality of solar power generation units.

2. The lifting method of claim 1.

11. A rope is attached to the air frame to which a safety belt worn by a maintenance worker can be connected.

11. The lifting method of claim 10.

12. The solar power generation unit has a reflector on the edge of the top surface. A lifting method according to any one of claims 1 to 11.

13. A solar panel, a frame portion surrounding the edge of the solar cell panel; a plurality of magnetic bodies fixed to the frame portion; Solar power generation unit.

14. a band-shaped base frame that has a length that allows installation across the top surfaces of multiple solar power generation units and that expands when air is injected into it; side frames fixed to both edges of the base frame along a longitudinal direction thereof, and inflated to a side opposite the solar power generation unit when air is injected; a nozzle for injecting air into the base frame and the side frames and for discharging air from the base frame and the side frames; A rope attached to the side frame; An air frame comprising:

Images