Two-faced photovoltaic power generation system and installation method for photovoltaic power generation system

Abstract

To provide a photovoltaic power generation system capable of securing a power generation amount regardless of the movement of the sun.SOLUTION: A two-faced photovoltaic power generation system 10 comprises: a first solar panel section 12 which is installed with an inclination at a predetermined angle α; a second solar panel section 14 which is installed with an inclination at the predetermined angle α so as to be opposed with the first solar panel section 12; and a strut section 16 including a support portion in an isosceles triangle shape for supporting the first solar panel section 12 and the second solar panel section 14.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a bifacial photovoltaic power generation system and a method for installing a photovoltaic power generation system. [Background technology]

[0002]

[0003] Conventionally, photovoltaic power generation systems have been installed in various locations. For example, Patent Document 1, which is a technology related to the present invention, discloses a solar cell panel arrangement in which a plurality of solar cell panels are arranged with gaps between them and tilted relative to the ground, and an auxiliary solar cell panel is added to at least one of the plurality of solar cell panels so as to be connected to or adjacent to the southern side of the light-receiving surface of the solar cell panel, and the auxiliary solar cell panel is arranged at a more tilted angle than the solar cell panel, and a gap between the solar cell panel and another solar cell panel adjacent to the solar cell panel is formed between a first surface along which sunlight on the winter solstice day in the region where the solar cell panel arrangement is installed passes through the northern upper end of the adjacent solar cell panel and reaches the ground, and a second surface along which sunlight on the winter solstice day in the region where the solar cell panel arrangement is installed reaches the southern upper end of the solar cell panel to which the auxiliary solar cell panel is added. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2019-17156 Summary of the Invention [Problem to be solved by the invention]

[0004] The solar cell panel disclosed in Patent Document 1 generates power only from light incident on one surface, so the amount of power generated varies depending on the position of the sun in each time period.

[0005] An object of the present invention is to provide a photovoltaic power generation system that can ensure sufficient power generation even if the position of the sun changes. [Means for solving the problem]

[0006] The bifacial solar power generation system of the present invention is characterized by comprising a first solar panel unit installed at a tilt of a predetermined angle α, a second solar panel unit installed at a tilt of a predetermined angle α so as to face the first solar panel unit, and a support unit having an isosceles triangular support unit for supporting the first solar panel unit and the second solar panel unit.

[0007] In addition, the dihedral solar photovoltaic power generation system of the present invention preferably has a truss structure that is symmetrical in two triangular regions separated by drawing a perpendicular line from the apex to the base of the isosceles triangle of the support part.

[0008] The installation method for a solar power generation system according to the present invention is characterized by comprising a step of installing the above-mentioned bifacial solar power generation system so that the surface of the first solar panel unit faces west and the surface of the second solar panel unit faces east.

[0009] In addition, it is preferable that the installation method for a solar power generation system according to the present invention further comprises a step of installing the single-sided solar panel unit, which is installed at an inclination angle β, so that the surface of the solar panel faces south. [Effects of the Invention]

[0010] According to the present invention, it is possible to ensure the required amount of power generation even if the position of the sun changes. [Brief explanation of the drawings]

[0011] [Figure 1] 1 is a front view showing a bifacial photovoltaic power generation system according to a first embodiment of the present invention. [Figure 2] 1 is a perspective view showing a bifacial photovoltaic power generation system according to a first embodiment of the present invention. [Figure 3] FIG. 10 is a front view showing a dihedral photovoltaic power generation system according to a second embodiment of the present invention. [Figure 4] FIG. 10 is a front view showing a dihedral photovoltaic power generation system according to a third embodiment of the present invention. [Figure 5] FIG. 10 is a front view showing a dihedral photovoltaic power generation system according to a fourth embodiment of the present invention. [Figure 6] FIG. 10 is a diagram showing the state of a conventionally used monofacial solar panel unit in a bifacial solar power generation system according to all embodiments of the present invention when it is subjected to a strong crosswind. [Figure 7] FIG. 1 is a diagram showing that the bifacial photovoltaic power generation systems of all the embodiments according to the present invention have a structure that is resistant to crosswinds. [Figure 8] FIG. 10 is a diagram showing a bifacial photovoltaic power generation system according to a third embodiment of the present invention installed in a heavy snowfall and strong wind area. [Figure 9] FIG. 10 is a diagram showing a bihedral photovoltaic power generation system, which is a modified example of the bihedral photovoltaic power generation system of the fourth embodiment according to the present invention, installed in a particularly heavy snowfall and strong wind area. DETAILED DESCRIPTION OF THE INVENTION

[0012] Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following, similar elements in all drawings will be designated by the same reference numerals, and duplicate explanations will be omitted. Furthermore, in the description below, previously described reference numerals will be used as necessary.

[0013] Fig. 1 is a front view showing a bihedral photovoltaic power generation system 10 according to a first embodiment of the present invention. Fig. 2 is a perspective view showing a bihedral photovoltaic power generation system 10 according to the first embodiment of the present invention.

[0014] A bihedral photovoltaic power generation system 10 according to a first embodiment of the present invention is a system capable of generating electricity by receiving sunlight from various directions. The bihedral photovoltaic power generation system 10 includes a first solar panel unit 12, a second solar panel unit 14, and a support unit 16.

[0015] The first solar panel unit 12 is a solar panel installed at a predetermined inclination angle α. The first solar panel unit 12 is configured with a plurality of solar cells lined up, and has the function of generating electricity by utilizing the photovoltaic effect using sunlight. Various solar cell configurations are considered, and for example, silicon-based, compound-based, organic-based, quantum dot-based, etc. can be used. In this example, a silicon-based solar cell is configured to be able to emit light not only from the front surface but also from the back surface.

[0016] Here, the predetermined angle α is preferably set to a value between 0° and 35°, and is most preferably set to 35°.

[0017] The second solar panel unit 14 is a solar panel installed at a predetermined angle α so as to face the first solar panel unit 12. Similar to the first solar panel unit 12, the second solar panel unit 14 is configured with multiple solar cells lined up and has the function of generating electricity by utilizing the photovoltaic effect using sunlight. Various solar cell configurations are considered, including silicon-based, compound-based, organic-based, and quantum dot-based solar cells. In this example, a silicon-based solar cell is used, which can emit light not only from the front surface but also from the back surface.

[0018] The support column 16 has an isosceles triangular support portion for supporting the first solar panel portion 12 and the second solar panel portion 14. As shown in Fig. 1, when the dihedral solar power generation system 10 is viewed from the front, it has an isosceles triangular shape, and these triangular support members are arranged in a row in the depth direction and the width direction as shown in Fig. 2.

[0019] The support column 16 has a truss structure that is symmetrical in two triangular regions separated by a perpendicular line drawn from the apex to the base of an isosceles triangle of the support column. Specifically, as shown in Fig. 1, the first truss is a triangle shape formed by support members 16a and 16b corresponding to the equilateral parts for mounting the first solar panel unit 12 and the second solar panel unit 14, and support member 16c corresponding to the base.

[0020] As shown in Figure 1, the first truss has support members 17a and 17b installed as legs at both ends of the bottom support member 16c, and support members 17c and 17d extending downward from the support members 16a and 16b at the center and also functioning as legs.

[0021] Support members 16a and 16b are connected at connecting portion 19a at the apex of the triangle. Support members 17a and 17b are connected at connecting portions 19f and 19g at the intersections of support members 16a, 16b and support member 16c.

[0022] The support members 17c and 17d are connected to the support members 16a and 16b at connecting portions 19b and 19c, and the support members 17c and 17d are connected to the support member 16c at connecting portions 19h and 19i.

[0023] Furthermore, support member 18a is provided on the left side of the two triangular regions so as to bisect the triangle formed by support members 16a, 16c, and 17c from the vertex (connecting portion 19h) toward the base. Support member 18a and support member 16a are connected at connecting portion 19d.

[0024] Support member 18b is provided on the right side of the two triangular regions, dividing the triangle formed by support members 16b, 16c, and 17d in half from the vertex (connecting portion 19i) toward the base. Support member 18b and support member 16b are connected at connecting portion 19e.

[0025] The second truss is a structure that forms the left triangular shape of the two triangular regions shown in Figure 1, and is formed by support members 16a, 17c, and 18a. The third truss is a structure that forms the left triangular shape of the two triangular regions, and is formed by support members 16a, 16c, and 18a.

[0026] The fourth truss is a structure that forms the right triangular shape of the two triangular regions shown in Figure 1, and is formed by support members 16b, 17d, and 18b. The fifth truss is a structure that forms the right triangular shape of the two triangular regions, and is formed by support members 16b, 16c, and 18b.

[0027] The bifacial photovoltaic power generation system 10 of the first embodiment according to the present invention is preferably installed in areas with little snowfall, such as a meadow where grass is harvested to provide livestock feed or compost.

[0028] When installing the solar panels on grassland, it is preferable to graze sheep on the grassland. This reduces maintenance costs by removing weeds that can reduce the power generation efficiency of solar panels. In addition, organic farming is possible using compost such as sheep droppings.

[0029] The advantage of grassland is that it does not require cutting down trees or uproots, it allows for environmentally friendly renewable energy, and it can be used for agriculture (grazing), livestock farming (grazing), and power generation, and it can generate revenue from these businesses.

[0030] Next, a bihedral photovoltaic power generation system 10a according to a second embodiment of the present invention will be described. Figure 3 is a front view showing a bihedral photovoltaic power generation system 10a according to the second embodiment of the present invention. The only difference between bihedral photovoltaic power generation system 10a and bihedral photovoltaic power generation system 10 is the predetermined angle α, and the rest is the same, so the following description will focus on the differences.

[0031] The predetermined angle α is preferably set to a value between 0° and 35°, and in this example, it is set to 15°.

[0032] Like bifacial solar power generation system 10, bifacial solar power generation system 10a of the second embodiment of the present invention is preferably installed in areas with little snow, and more preferably, installed in grassland, and will achieve the same effects as bifacial solar power generation system 10.

[0033] Next, a bihedral photovoltaic power generation system 10b according to a third embodiment of the present invention will be described. Figure 4 is a front view of bihedral photovoltaic power generation system 10b according to the third embodiment of the present invention. The only difference between bihedral photovoltaic power generation system 10b and bihedral photovoltaic power generation system 10 is the predetermined angle α, and the rest is the same, so the following description will focus on the differences.

[0034] The predetermined angle α is preferably set to 35° to 50°, and in this example, it is set to 40°. The ideal installation angle for solar panels is a slight inclination of 30°. However, it is important to note that latitudes vary depending on the region within Japan. For example, Okinawa is at 27° north latitude, while Hokkaido is at 45° north latitude. As a rough guide, it is preferable to set the angle to 18° when installing in Okinawa Prefecture, and 35° when installing in Hokkaido.

[0035] Here, the bifacial photovoltaic power generation system 10b of the third embodiment according to the present invention is preferably installed in a region with heavy snowfall, for example, Hokkaido, where temperatures are low throughout the year and where photovoltaic power generation can be performed at temperatures close to 25°C, the temperature at which photovoltaic power generation is said to be at its best, even in summer.

[0036] Eastern Hokkaido is located at a high latitude, receives a lot of sunlight, and is the easternmost region in Japan in terms of longitude, allowing for the fastest charging times in Japan. Furthermore, the low temperatures allow for efficient power generation. The bifacial solar power generation system 10b is preferably installed in a heavy snowfall area. Here, a "heavy snowfall area" refers to an area that receives a large amount of snowfall in winter, and in Japan's legal system, refers to an area designated specifically under the Act on Special Measures for Heavy Snowfall Areas.

[0037] Next, a third embodiment of a bihedral photovoltaic power generation system 10c according to the present invention will be described. Fig. 5 is a front view of a fourth embodiment of a bihedral photovoltaic power generation system 10c according to the present invention. The only difference between bihedral photovoltaic power generation system 10c and bihedral photovoltaic power generation system 10 is the predetermined angle α, and the rest is the same, so the following description will focus on the differences.

[0038] The predetermined angle α is preferably set to 45° to 70°, and in this example it is set to 70°. In areas with particularly heavy snowfall, it is necessary to provide a certain slope so that snow can slide off even if it accumulates on the solar panel.

[0039] The bifacial solar power generation system 10c of the third embodiment according to the present invention is preferably installed in a particularly heavy snowfall area, for example, Hokkaido. Here, the "particularly heavy snowfall area" refers to a part of a prefecture designated as a heavy snowfall area in accordance with the standards set by the Minister of Land, Infrastructure, Transport and Tourism, the Minister of Internal Affairs and Communications, and the Minister of Agriculture, Forestry and Fisheries after a resolution of the National Land Council, for an area where snowfall is particularly heavy and where the lives of residents are significantly affected by long-term suspension of automobile traffic due to snowfall.

[0040] All of the embodiments of the bifacial solar power generation systems 10, 10a, 10b, and 10c according to the present invention are capable of generating power on two surfaces, the first solar panel unit 12 and the second solar panel unit 14, which are arranged on the equilateral sides of an isosceles triangle, and therefore have the remarkable advantage of being able to ensure sufficient power generation even when the position of the sun changes due to the movement of the sun.

[0041] In all of the embodiments of the bifacial photovoltaic power generation systems 10, 10a, 10b, and 10c according to the present invention, the support poles 16 all have a truss structure, which has the remarkable advantage of allowing for stable installation that is resistant to snow accumulation and crosswinds.

[0042] FIG. 6 is a diagram showing the state of a conventionally used monofacial solar panel unit 8 in all of the bifacial solar power generation systems 10, 10a, 10b, and 10c according to the present invention when subjected to a strong crosswind.

[0043] FIG. 7 is a diagram showing that all of the dihedral photovoltaic power generation systems 10, 10a, 10b, and 10c according to the present invention have a structure that is resistant to crosswinds.

[0044] Here, the fact that bihedral solar power generation systems 10, 10a, 10b, and 10c can be installed stably and with high resistance to crosswinds will be described using Figures 6 and 7. While Figure 7 uses bihedral solar power generation system 10b for explanation, bihedral solar power generation systems 10, 10a, and 10c also provide similar advantages.

[0045] As shown in Figure 6, a conventional single-sided solar panel unit 8 includes a solar panel 8a and a support member 8b. In a single-sided solar panel unit 8, crosswinds blowing from the front surface of the solar panel 8a flow up and down along the panel surface, reducing the risk of the panel collapsing. However, as shown in Figure 6, when the soil is muddy, especially after rain, there is a risk that the wind blowing up from the back of the solar panel 8a may cause the entire panel to collapse, along with the support member 8b.

[0046] In contrast, as shown in Figure 7, the bifacial solar power generation system 10b has five truss structures, and therefore the structure supporting the first solar panel unit 12 and the second solar panel unit 14 is distributed from the support pillars, resulting in the strongest truss structure, which has the advantage of increasing the stability and strength of the panels.

[0047] The support column 16 is equipped with the first solar panel section 12 and the second solar panel section 14, and has an isosceles triangular roof structure, which allows crosswinds from any direction to flow along the panel surface, reducing the risk of collapse. Furthermore, because the system can be stabilized even with shallow support columns, installation costs can be kept low.

[0048] Next, a case where the bihedral photovoltaic power generation system 10b is installed in a heavy snowfall area will be described. Figure 8 is a diagram showing a bihedral photovoltaic power generation system 10b according to a third embodiment of the present invention installed in a heavy snowfall and strong wind area.

[0049] As shown in Fig. 8, bihedral photovoltaic power generation system 10b is installed so that the surface of first solar panel unit 12 faces west and the surface of second solar panel unit 14 faces east. As shown in Fig. 8, bihedral photovoltaic power generation systems 10b are arranged side by side on both ends of the installation area in the east-west direction.

[0050] The monofacial solar panel unit 8 is then installed between the bifacial solar power generation systems 10b, which are arranged in two separate areas, east and west, with the surfaces of the solar panels 8a facing south. The monofacial solar panel units 8 are aligned with a predetermined spacing in the direction of the solar panels. The solar panels 8a of the monofacial solar panel unit 8 are installed at a predetermined inclination angle β.

[0051] With this solar panel arrangement, the bifacial solar power generation system 10b has solar panels facing east-west, which increases the amount of power generated by sunlight in the morning and evening, while the single-facial solar panel unit 8 facing south is located in the center, which increases the amount of power generated during the day. This allows for stable power generation from morning to evening. Furthermore, there is no peak cut due to overloading, so there is no power loss, and power generation efficiency can be increased without putting a strain on the power transmission and distribution system, which has the advantage of not putting a strain on the power transmission lines.

[0052] Furthermore, since the bifacial solar power generation system 10b can generate power from light incident on both sides, it can also generate power from light reflected off snow.

[0053] Next, a case where a bihedral photovoltaic power generation system 10c is installed in a particularly heavy snowfall area will be described. Fig. 9 is a diagram showing a bihedral photovoltaic power generation system 10c, which is a modified example of the bihedral photovoltaic power generation system 10 of the fourth embodiment of the present invention, installed in a particularly heavy snowfall and strong wind area.

[0054] As shown in Figure 9, the bihedral solar power generation system 10c is installed so that the surface of the first solar panel unit 12 faces west and the surface of the second solar panel unit 14 faces east. As shown in Figure 9, multiple bihedral solar power generation systems 10c are aligned and arranged at predetermined intervals throughout the installation area.

[0055] This solar panel arrangement allows the solar panels to face east-west, increasing the amount of power generated in the morning and evening. Furthermore, the tilt angle of the bifacial solar power generation system 10c is set to 70°, which has the advantage of minimizing the impact of snow in particularly heavy snowfall areas. [Explanation of symbols]

[0056] 8 Single-sided solar panel section, 8a Solar panel, 8b Support section, 10, 10a, 10b, 10c Bi-sided solar power generation system, 12 First solar panel section, 14 Second solar panel section, 16 Support section, 16a, 16b, 16c, 17a, 17b, 17c, 17d, 18a, 18b Support members, 19a, 19b, 19c, 19d, 19e, 19f, 19g, 19h, 19i Connection sections.

Claims

1. a first solar panel unit installed at a tilt angle of a predetermined angle α; A second solar panel unit installed at a predetermined angle α so as to face the first solar panel unit; a support pole portion having an isosceles triangular support portion for supporting the first solar panel portion and the second solar panel portion; A bifacial solar power generation system comprising:

2. 2. The bifacial solar power generation system according to claim 1, A bifacial solar power generation system characterized by having a truss structure that is symmetrical in two triangular areas separated by drawing a perpendicular line from the apex to the base of the isosceles triangle of the support part.

3. 10. A method for installing a solar power generation system, comprising the step of installing the bifacial solar power generation system according to claim 1 so that the surface of the first solar panel portion faces west and the surface of the second solar panel portion faces east.

4. The method for installing a solar power generation system according to claim 3, A method for installing a solar power generation system, further comprising the step of installing a single-sided solar panel unit that is installed at a predetermined inclination angle β so that the surface of the solar panel faces south.

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