JP7156879B2 - Support structure for floating photovoltaic system and floating photovoltaic system - Google Patents

Description

TECHNICAL FIELD The present invention relates to a support structure for a floating photovoltaic system and a floating photovoltaic system.

In recent years, solar cell modules have been installed on the surface of water such as lakes and ponds as photovoltaic power generation systems. In this type of floating solar power generation system, a solar cell module is installed on a float floating on the surface of water so that the surface of the water, which is less likely to be shaded, can be effectively utilized.

In general, a solar cell module can increase its power generation efficiency by setting its tilt angle at the optimum incident angle of sunlight. Similarly, in the floating solar power generation system, the solar cell modules are arranged to be inclined on the float. In this case, unlike the case where the solar cell module is installed on a flat roof or a horizontal surface such as the ground, the water surface waves and moves up and down due to the wind, etc., so the float with the solar cell module is stably supported and blown up by strong winds. It is also required to tether it so that it does not get knocked over or flipped.

As an example of this type of floating photovoltaic power generation system, for example, Patent Document 1 discloses that a plurality of floats supporting solar cell modules are connected to each other and installed on the surface of the water in a state where the adjacent floats are allowed to swing. disclosed. Cables are provided at the outer peripheral corners of the plurality of connected float aggregates, and the cables are moored by mooring means. The anchoring means consist of an anchoring cord connected to the cord and an anchor connected to the end of the anchoring cord. The anchoring cable extends obliquely downward and extends to the bottom of the water outside the float assembly (see FIGS. 19 and 28 of Patent Document 1).

JP-A-2003-229593

As schematically shown in FIG. 8, the support structure of the conventional floating photovoltaic power generation system includes a plurality of floating structures (islands) 81, which are aggregates of floats floating on the surface of the water, connected to the outer periphery. are moored to anchors 83 on the bottom of the water while being pulled in a plurality of different directions. The mooring cable 82 is arranged in a plan view, with the water structure 81 as the center, extending outward from the outer periphery thereof.

In the case of the support structure of the floating photovoltaic power generation system shown in FIG. 8, it is necessary to arrange a large number of mooring means in a plurality of directions from the floating structure 81 to the north, south, east and west, considering the wind pressure load acting on the solar cell module. was there. As a result, the number of moorings to the floating structure 81 becomes extremely large, and the installation work takes time and effort, and there is a problem that the cost for installing the floating photovoltaic power generation system increases.

Moreover, in order to increase the power generation efficiency and effectively utilize the water surface, it is desirable to secure the area of the floating structure 81 as large as possible. However, the mooring ropes 82 and anchors 83 must be placed in the water and the bottom of the water outside the water structure 81, and it is necessary to provide a distance of at least 5 to 10 m from the shore to the outer periphery of the water structure 81. there were. Therefore, there is also a problem that the ratio of the area of the water structure 81 to the area of the water surface becomes low.

The present invention has been made in view of the above-mentioned problems, and its object is to stably moor the solar cell modules on water, to reduce the number of moorings, and to reduce the installation area of the solar cell modules. An object of the present invention is to provide a new support structure for a floating photovoltaic power generation system and a floating photovoltaic power generation system using this support structure, which can achieve both expansion and expansion.

The solution of the present invention for achieving the above object presupposes a support structure for a floating photovoltaic system having a float supporting a solar cell module and floating on the water surface. As the support structure, a plurality of the floats are interconnected to form a floating structure supporting a plurality of solar cell modules, and the floating structure is provided with mooring members. Further, the mooring member is disposed between the float and a projected area on the bottom of the water when the above water structure is vertically projected.

With such specific matters, it is possible to stably moor the solar cell modules, reduce the number of moorings, and expand the installation area of the solar cell modules.

More specific configurations of the support structure for the photovoltaic power generation system include the following. That is, in the support structure for the floating solar power generation system, the mooring member includes a mooring cable having one end connected to the float, and an anchor having the other end connected to the mooring cable and fixed to the water bottom. Configured.

Moreover, it is preferable that the anchor is provided inside the projection area on the bottom of the water. This makes it possible to expand the installation area of the above water structure.

Further, the anchor may be provided on the inner periphery of the projection area on the bottom of the water. This also makes it possible to expand the installation area of the above water structure.

Further, it is preferable that the anchor is connected to the other end of a mooring cable extending from a plurality of directions. This makes it possible to stably moor the water structure by the anchors provided in the projection area.

It is also preferred that the floating structure has an opening vertically above the anchor. As a result, when draining the water area where the solar power generation system is installed, the floating structure can be placed on the bottom of the water without interfering with the anchor.

Further, it is preferable that a guide rope having a length capable of pulling the above water structure down to the bottom of the water is connected to the above water structure. This makes it possible to guide and place the above water structure at a desired position on the bottom of the water.

Further, in order to achieve the above object, a floating solar power generation system in which a plurality of solar cell modules are supported above water by the support structure of the floating solar power generation system is also within the scope of the technical idea of the present invention. . As a result, it is possible to reduce the number of moorings of the above water structure and expand the installation area of the solar cell modules, thereby stably mooring the solar cell modules and effectively utilizing the surface of the water. .

ADVANTAGE OF THE INVENTION By this invention, while mooring a solar cell module stably, it becomes possible to reduce the number of moorings and to expand the installation area of a solar cell module.

BRIEF DESCRIPTION OF THE DRAWINGS It is a top view which shows typically the basic composition of the floating solar power generation system which concerns on Embodiment 1 of this invention, and its support structure. FIG. 2 is a cross-sectional view taken along the line AA in FIG. 1; It is a perspective view which expands and shows a part of said floating solar power generation system. Fig. 2 is a plan view schematically showing a floating solar power generation system and its support structure according to Embodiment 2 of the present invention; FIG. 5 is a cross-sectional view taken along line BB in FIG. 4; FIG. 6 is a cross-sectional view showing how water is drained in the floating solar power generation system shown in FIG. 5 ; It is explanatory drawing which shows the support structure of the floating photovoltaic power generation system which concerns on other embodiment of this invention. FIG. 2 is a cross-sectional view schematically showing a support structure of a conventional floating photovoltaic power generation system;

EMBODIMENT OF THE INVENTION Hereinafter, the support structure of the floating solar power generation system which concerns on embodiment of this invention, and the floating solar power generation system to which this supporting structure is applied are demonstrated, referring drawings.

(Embodiment 1)
FIG. 1 is a plan view schematically showing a floating solar power generation system 1 and its support structure according to Embodiment 1 of the present invention, and FIG. 2 is a cross-sectional view taken along line AA in FIG. Moreover, FIG. 3 is a perspective view which expands and shows a part of floating solar power generation system 1. As shown in FIG.

The floating solar power generation system 1 is configured by supporting a plurality of solar cell modules on a float that floats on the water surface. 1 and 2 schematically show the floating structure 2 which is an assembly of a plurality of floats, omitting a plurality of solar cell modules and the like installed on the floats.

The floating photovoltaic power generation system 1 is installed in a water area 10 such as a reservoir, a reservoir, a fishpond, a lake, or the sea to generate power. As shown in an enlarged view in FIG. 3 , in the floating solar power generation system 1 , a plurality of solar cell modules 3 are arranged in a matrix on the upper surface of a substantially rectangular float 4 floating on the surface of the water, and supported by supporting members 31 . supported in an inclined state.

The solar cell module 3 has a rectangular shape, for example, and has a structure in which a plurality of solar cells (not shown) are sandwiched and sealed between a light-receiving surface protective material made of glass, film, or the like and a back surface protective material. there is The type of solar cell used in the solar cell module 3 is not particularly limited. Examples include organic solar cells such as thin films.

A plurality of floats 4 are interconnected to form one floating structure (island) 2, as shown in FIG. It is preferable that the float 4 is provided with a connecting portion (not shown) and connected to the adjacent float 4 in a rotatable state. Each float 4 is, for example, a resin-molded floating body with a hollow inside, and is formed so as to obtain sufficient buoyancy with the solar cell module 3 attached. Between the floats 4, an auxiliary float without the solar cell module 3 may be connected as a walking space for performing maintenance work.

In the floating photovoltaic power generation system 1, the plurality of floats 4 constituting the floating structure 2 are rotatable with respect to each other in the vertical direction. is also configured to allow its vertical displacement. In addition, it is possible to prevent excessive load from being applied to the float 4 and to suppress the occurrence of breakage. The float 4 is not limited to being rotatably connected via the connecting portion, and may be connected by any method to form the floating structure 2 .

The solar cell module 3 is mounted on the upper surface of the float 4 so that its light receiving surface 32 is inclined in order to increase the efficiency of receiving sunlight. The light-receiving surfaces 32 of all the solar cell modules 3 are installed with their tilt directions aligned in a specific direction.

For example, as shown in FIG. 1, one side of a rectangular floating structure 2 is arranged along the north-south direction, and another side adjacent to the one side is arranged along the east-west direction. In this case, the plurality of solar cell modules 3 (not shown) provided on the floating structure 2 are inclined in the same direction so that each of the light receiving surfaces 32 faces south, for example.

The water structure 2 is provided with mooring members 5 for restraining the plurality of floats 4 on the water surface. The solar cell module 3 is held with the light-receiving surface 32 aligned in a specific tilt direction by mooring the floating structure 2 .

As shown in FIGS. 1 and 2 , the mooring member 5 has a mooring rope 51 and an anchor 52 connected to the mooring rope 51 . One end of the mooring cable 51 is connected to one of the floats 4 that constitute the floating structure 2 , and the other end is connected to the anchor 52 . The mooring rope 51 is preferably a rope body having strength and weather resistance, such as a metal wire rope made of stainless steel wire, a fiber rope, or a composite rope combining a metal wire rope and a fiber material. and is not particularly limited.

An anchor 52 is installed on the bottom 6 of the water. Here, the place where the anchor 52 is installed is within a projection area 61 formed when the water structure 2 is vertically projected. This projection area 61 is an area where the projection line of the water structure 2 floating on the water surface is projected when it is perpendicular to the water bottom 6 which is the projection plane. In the illustrated form, the anchor 52 is provided inside the projection area 61 on the water bed 6 and is positioned directly below the central portion of the floating structure 2 .

Further, the other end of the mooring cable 51 extending from a plurality of directions is connected to the anchor 52 . A plurality of mooring lines 51 are arranged between the float 4 and a projected area 61 of the water bottom 6 . A plurality of floats 4 constituting the floating structure 2 are connected to each other in the east-west direction and the north-south direction, and mooring members 5 are evenly arranged with respect to these floats 4 .

In the example shown in FIG. 1, one mooring cable 51 extends north and one south of the anchor 52 in the north-south direction (inclination direction of the light receiving surface 32 of the solar cell module 3). In addition, in the east-west direction that intersects with the anchor 52, one is extended on the east side of the anchor 52 and one is extended on the west side. Thus, a total of four mooring ropes 51 are evenly arranged below the floating structure 2 .

In the floating photovoltaic power generation system 1, water is drained periodically for maintenance of the water area 10, etc., and the water structure 2 floating on the surface of the water must be pulled down to the bottom 6 by draining the water area 10. be. In preparation for such a case, the aquatic structure 2 is provided with an opening 21 vertically above the anchor 52 .

The openings 21 are formed between the plurality of floats 4 forming the floating structure 2 . The size of the opening 21 is sufficient if it is large enough to accommodate the anchor 52 inside. In the illustrated form, the anchor 52 is installed in the central part of the projection area 61 of the water bed 6, and the opening 21 is provided in the central part of the floating structure 2 located vertically above this. As such an opening 21, it is possible to use any of the gaps 33 between the floats 4 shown in FIG.

Further, a guide rope 7 having a length that allows the floating structure 2 to be pulled down to the bottom 6 is connected to the floating structure 2 . The guide rope 7 is arranged between the shore 11 surrounding the outer periphery of the water area 10 and the floating structure 2 . As shown in FIG. 1, the guide ropes 7 extend from the outer edge of the water structure 2 in the east-west direction of the water structure 2, and are connected and fixed to the bank 11 on the opposite bank.

Each guide rope 7 is formed of a rope body similar to the mooring rope 51, and has a length corresponding to the distance between the water structure 2 and the shore 11 when the water structure 2 is lowered to the water bottom 6. have. Therefore, as shown in FIG. 2, when the floating structure 2 is moored on the surface of the water, the guide rope 7 is arranged in a bent state in the water.

The support structure for the floating photovoltaic power generation system 1 configured in this manner enables the floating structure 2 including the plurality of solar cell modules 3 to be stably moored and supported in the water area 10 . In addition, compared to the conventional structure shown in FIG. 8, it is necessary to extend the mooring cable 51 to the outside of the water structure 2 and to provide an area for anchor installation outside the projection area 61. Therefore, it is possible to secure a large ratio of the area of the floating structure 2 to the area of the water surface. As shown in FIG. 2, it is also possible to increase the area of the floating structure 2 to the full area of the water bottom 6 , so that more solar cell modules 3 can be installed in the water area 10 .

In FIG. 1, for comparison, it is indicated by a chain double-dashed line assuming that a mooring cable 82 and an anchor 83 having a conventional structure are arranged. In this embodiment, the number of mooring ropes 51 is the same as that of the conventional structure, but the anchors 52 can be gathered at only one central portion. As a result, it is possible to reduce the cost of members, reduce the time and effort required for installation work, and improve workability.

As shown by the dashed line in FIG. 2, when draining water, the floating structure 2 is guided by the guide rope 7 and pulled down to the bottom 6 as the water level drops. An anchor 52 of the water bottom 6 is inserted into the opening 21 of the aquatic structure 2 . Since the floating structure 2 is provided with the guide rope 7, the floating structure 2 can be placed at a desired position on the bottom of the water 6 without shifting. Since the water structure 2 is provided with the opening 21, the water structure 2 can be lowered to the water bottom 6 without the anchor 52 of the water bottom 6 interfering with the float 4 or the like.

(Embodiment 2)
4 is a plan view schematically showing the floating solar power generation system 1 and its support structure according to Embodiment 2, and FIG. 5 is a cross-sectional view taken along line BB in FIG. FIG. 6 is a cross-sectional view schematically showing an installation form of the floating structure 2 when water is drained from the state of FIG.

In the floating solar power generation system 1 , the mooring members 5 can be arranged in various forms according to the size of the floating structure 2 to stably moor the floating structure 2 to the water area 10 . This embodiment is characterized by the arrangement of the mooring members 5, and the basic configuration of the floats 4 constituting the floating structure 2, the solar cell modules 3 supported by the floating structure 2, etc. is the same as that of the first embodiment. common with

The mooring member 5 includes a plurality of mooring ropes 51 one end of which is connected to the float 4, and a plurality of anchors 52 to which the other ends of the mooring ropes 51 are connected. As shown in FIGS. 4 and 5, the anchors 52 are evenly distributed at four locations inside the projected area 61 of the bottom 6 . Mooring cables 51 extending in the four directions of east, west, north, and south are connected to the eastmost anchor 52 and the westmost anchor 52 . A mooring cable 51 extending in two north-south directions is connected to the northmost anchor 52 and the southmost anchor 52 .

The aquatic structure 2 is provided with an opening 21 vertically above each anchor 52 so as to correspond to the layout of the anchors 52 . As in the first embodiment, the guide ropes 7 extend from the outer edge of the water structure 2 in the east-west direction of the water structure 2 and are connected to the shore 11 on the opposite bank.

With such a support structure for the floating photovoltaic power generation system 1, as is clear from a comparison of FIGS. It becomes possible to stably moor and support the battery module 3 in the water area 10 . As shown in FIG. 4, 12 anchors 83 for 12 mooring cables 82 required in the conventional structure can be replaced with 4 anchors 52 in this case. Therefore, compared with the conventional structure, in this embodiment, it is possible to greatly reduce the cost required for mooring, and the workability is greatly improved.

Further, as shown in FIG. 6, when the water is drained, the water structure 2 is guided by the guide ropes 7 as the water level drops, and is smoothly pulled down to the bottom 6 of the water. are inserted respectively. By providing the guide ropes 7 in this way, it is possible to place the floating structure 2 at a desired position on the bottom of the water 6 without shifting.

(Other embodiments)
The support structure of the floating solar power generation system 1 according to the present invention, and the floating solar power generation system 1 in which a plurality of solar cell modules 3 are supported by this supporting structure, can be implemented in various forms other than the above embodiments. can be implemented. For example, the anchor 52 of the mooring member 5 is not limited to being installed in the location shown in the above-described embodiment within the projection area 61 of the water bottom 6, and may be installed at any position within the projection area 61. good.

As shown in FIG. 7 , the anchors 52 may be provided on the inner periphery of the projection area 61 . That is, when the waterborne structure 2 is viewed from above, the anchor 52 is located within the projected area 61 of the waterborne structure 2 and near its outer periphery. An opening 21 is provided vertically above the anchor 52 in the floating structure 2 . The anchor 52 is connected to the other end of the mooring cable 51 extending from multiple directions inside the projection area 61 . Also in this case, it is possible to stably moor and support the plurality of solar cell modules 3 in the water area 10 .

As described above, the installation locations of the anchors 52 and the mooring cables 51 are not particularly limited as long as they are within the projection area 61 . As such, the above embodiments are illustrative and not limiting. In either form, the solar cell modules 3 can be stably moored, the number of moorings can be reduced, the installation cost can be suppressed, and the installation area of the solar cell modules 3 can be expanded. becomes.

INDUSTRIAL APPLICABILITY The present invention can be suitably used in a photovoltaic power generation system installed on water.

1 Floating Photovoltaic System 2 Floating Structure 21 Opening 3 Solar Cell Module 32 Light Receiving Surface 4 Float 5 Mooring Member 51 Mooring Rope 52 Anchor 6 Bottom of Water 61 Projection Area 7 Guide Rope

Claims (8)

A support structure for a floating solar power generation system having a float that supports a solar cell module and floats on water,
a plurality of the floats are interconnected to form a floating structure supporting a plurality of solar cell modules, the floating structure being provided with a mooring member ;
The mooring member is arranged between a projected area on the bottom of the water when the above water structure is vertically projected and the float ,
A support structure for a floating photovoltaic power generation system , wherein a guide rope having a length capable of pulling the floating structure down to the bottom of the water is connected to the floating structure. In the support structure of the floating solar power generation system according to claim 1,
A support structure for a floating solar power generation system, wherein the mooring member includes a mooring cable having one end connected to the float, and an anchor having the other end connected to the mooring cable and fixed to the water bottom. In the support structure of the floating solar power generation system according to claim 2 ,
A support structure for a floating solar power generation system, wherein the floating structure has an opening vertically above the anchor. A support structure for a floating solar power generation system having a float that supports a solar cell module and floats on water,
a plurality of the floats are interconnected to form a floating structure supporting a plurality of solar cell modules, the floating structure being provided with a mooring member;
The mooring member is disposed between the float and a projected area on the bottom of the water when the above water structure is vertically projected. an anchor coupled at its ends and secured to the bottom of the water;
A support structure for a floating solar power generation system, wherein the floating structure has an opening vertically above the anchor. In the support structure for the floating solar power generation system according to any one of claims 2 to 4 ,
A support structure for a floating solar power generation system, wherein the anchor is provided inside the projection area on the bottom of the water. In the support structure for the floating solar power generation system according to any one of claims 2 to 5 ,
A support structure for a floating photovoltaic power generation system, wherein the anchor is provided in an inner peripheral portion of the projection area on the bottom of the water. In the support structure for the floating solar power generation system according to any one of claims 2 to 6 ,
A support structure for a floating photovoltaic power generation system, wherein the anchor is connected to the other ends of mooring cables extending from a plurality of directions. A floating photovoltaic power generation system in which a plurality of solar cell modules are supported above water by the support structure for a floating photovoltaic power generation system according to any one of claims 1 to 7.

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