Solar power generation system

Abstract

This invention provides a solar power generation system that generates electricity by mounting or installing new, thin, lightweight, and flexible solar panels on top of existing solar panels, without having to discard the existing solar panels. [Solution] This is a solar power generation system in which a new solar panel is attached or bonded to the surface of an existing solar panel, and the electromotive force from the new solar panel is supplied to the electrical system of the existing solar panel.

Description

Technical Field

[0001] The present invention relates to a photovoltaic power generation system that realizes new photovoltaic power generation without discarding existing solar panels, and particularly relates to an economical photovoltaic power generation system that obtains new electromotive force by mounting or attaching a thin, lightweight, flexible perovskite-type solar panel to the surface of an existing solar panel, and eliminates the need to discard the existing solar panel.

Background Art

[0002] In recent years, carbon dioxide emissions have increased on a global scale, and the problem of global warming caused by greenhouse gases is becoming increasingly serious. Therefore, the construction of a society with low carbon dioxide emissions, that is, a low-carbon society, has become a global issue. To realize a low-carbon society, photovoltaic power generation and wind power generation as renewable energy have been widely popularized. In addition, after the risks of nuclear power generation have been exposed to the public, it has also become difficult to rely on nuclear power generation for energy supply.

[0003] With such a background, furthermore, Japan originally lacks resources that serve as energy sources, and its energy self-sufficiency rate is considerably lower than that of other developed countries. In Japan, there is also a situation where the popularization of renewable energy power generation facilities, which are still insufficient in the country, must be promoted. In 2012, the FIT (Feed-in Tariff) Act was enacted, and a large number of photovoltaic power generation systems were installed everywhere. Figure 1 is a schematic diagram explaining the concept of the FIT system. As renewable energy sources, there are wind power generation 1, biomass power generation 2, hydropower generation 3, photovoltaic power generation 4 and geothermal power generation 5. The electromotive force, which is renewable energy generated by these power generation methods, is supplied (transmitted) to the power company 6. Then, the power company 6 purchases the power transmitted from the power plant at a fixed price for a fixed period of time.

[0004] Among renewable energy sources, solar power generation is considered particularly promising due to the ease with which power generation systems can be constructed. Figure 2 schematically shows an example of a conventional solar power generation system, in which high-voltage solar power plants 11, 12, and 13 are installed on a power generation site 10 such as a mountain or field, with numerous solar panels 20-1, 20-2, and 20-3 mounted on sturdy frames and bases, respectively. Figure 3 shows an example where a high-voltage solar power plant 31 is installed on the roof of a commercial facility 30 such as a supermarket or home center, with numerous solar panels 20 mounted on sturdy frames and bases. Furthermore, Figure 4 shows an example where solar panels 20 are installed on the roof of a typical house 40.

[0005] In all cases, the solar panel 20 is rectangular in shape, as shown in Figure 5, and has a strong rigidity and thickness that prevents damage. In other words, conventional solar panels 20 are thick and heavy and lack flexibility, so they cannot be installed on curved surfaces such as domes, and also cannot be installed on structures with weak strength such as prefabricated houses.

[0006] Furthermore, the electricity generated by the solar panels 20 is stored and consumed in an electrical system as shown in Figure 6. Specifically, the electromotive force (DC) from solar panels 20-1 to 20-n is combined in the combining unit 210 and charged into the storage unit 211. It is also input to the inverter 213 via the switching control unit 212, where it is converted to alternating current (AC) and supplied to lighting fixtures 220, sensors 221, various electrical equipment 222, etc. When there is no power usage, all the electromotive force from solar panels 20-1 to 20-n is stored in the storage unit 211. When power is consumed, the power stored in the storage unit 211 is supplied to lighting fixtures 220, sensors 221, various electrical equipment 222, etc. via the switching control unit 212 and the inverter 213. [Prior art documents] [Patent Documents]

[0007] [Patent Document 1] Patent No. 7611626 [Patent Document 2] Japanese Patent Publication No. 2023-126071 [Patent Document 3] Japanese Patent Publication No. 2025-12248 [Patent Document 4] Japanese Patent Publication No. 2023-134037 [Overview of the project] [Problems that the invention aims to solve]

[0008] Conventional solar panels are thick, rigid, and heavy, making them very robust. Therefore, when used in solar power plants, they require secure fixing via support structures such as bases and frames, and they cannot be installed on curved surfaces. Furthermore, because the solar panels are so firmly fixed, they cannot be removed and reused. Traditionally, when dismantling a solar power plant, the solar panels had to be discarded along with the plant, requiring the construction of a new power plant, which was extremely wasteful and uneconomical.

[0009] On the other hand, the disposal period for solar panels installed in the early stages of the FIT (Feed-in Tariff) system will begin in the 2030s, but there is a problem in that the development of industrial waste disposal and recycling facilities has not kept pace.

[0010] Recently, thin, lightweight, and flexible solar panels have emerged. These are perovskite-type solar panels made of monocrystalline silicon, similar to conventional perovskite solar panels, but made by thinning the monocrystalline silicon panel to the extreme. Their use is highly anticipated. Conventional solar panels are heavy, and the need for mounting frames and bases adds further weight, making them unsuitable for installation on roofs with low durability. However, perovskite-type solar panels can be installed on roofs where conventional solar panels cannot be installed.

[0011] The present invention was made in accordance with the circumstances described above, and the object of the present invention is to provide a solar power generation system that obtains electricity by mounting or installing a new, thin, lightweight, and flexible solar panel on top of an existing solar panel, without having to discard the existing solar panel. [Means for solving the problem]

[0012] The present invention relates to a photovoltaic power generation system, and the above objective of the present invention is achieved by mounting or attaching a new photovoltaic panel to the surface of an existing photovoltaic panel and supplying the electromotive force from the new photovoltaic panel to the electrical system of the existing photovoltaic panel, and is more effectively achieved by the new photovoltaic panel being a perovskite photovoltaic panel or by mounting or attaching it using double-sided tape or adhesive. [Effects of the Invention]

[0013] In the solar power generation system of the present invention, a perovskite-type solar panel or perovskite solar panel, which is made of monocrystalline silicon like a conventional solar panel but is made by thinning the monocrystalline silicon panel to the extreme, is mounted or installed on top of the solar panels of an existing solar power generation system, and power is generated by the newly installed perovskite-type solar panel or perovskite solar panel. Therefore, there is no need to dispose of the existing solar panels, and problems such as industrial waste disposal and recycling facilities can be alleviated.

[0014] Furthermore, since the panels can be attached or installed on top of existing solar panels using double-sided tape or adhesive, installation can be done inexpensively, easily, and quickly. Because the existing solar power generation system can be used with only minor modifications, it is extremely economical. Perovskite solar panels are extremely lightweight, so even when installed on top of existing solar panels, they do not add significant load and do not strain the structural integrity of the installation building.

[0015] Since the liberalization of electric power began in 2016, there is an advantage that power can be purchased even after the expiration of the 20-year FIT period. For owners of photovoltaic power generation systems, there are advantages that the photovoltaic power generation facilities can be used continuously, no disposal cost is incurred for existing photovoltaic panels, and power sales after FIT can be maintained. [BRIEF DESCRIPTION OF THE DRAWINGS]

[0016] [Figure 1] It is a schematic diagram explaining the concept of FIT (Feed-in Tariff). [Figure 2] FIG. 1 is an overall configuration diagram schematically showing an example of a conventional general photovoltaic power generation system (power generation site). [Figure 3] FIG. 2 is an overall configuration diagram schematically showing an example of a conventional general photovoltaic power generation system (a roof or rooftop of a supermarket or the like). [Figure 4] FIG. 3 is a perspective view schematically showing an example of a conventional general photovoltaic power generation system (general house). [Figure 5] FIG. 4 is a perspective view showing an example of a conventional photovoltaic panel. [Figure 6] FIG. 5 is a block diagram showing a configuration example of an electric system of a conventional photovoltaic power generation system. [Figure 7] FIG. 6 is a perspective view showing an example of a perovskite-type photovoltaic panel. [Figure 8] FIG. 7 is a schematic diagram showing an installation example of a perovskite-type photovoltaic panel. [Figure 9] FIG. 8 is a diagram showing an example of mounting a perovskite-type photovoltaic panel onto an existing photovoltaic panel. [Figure 10] FIG. 9 is a bottom view showing a state where double-sided tape is attached to a perovskite-type photovoltaic panel. [Figure 11] FIG. 10 is an overall configuration diagram schematically showing a state where the perovskite-type photovoltaic panel of the present invention is mounted or attached to a photovoltaic panel of a conventional high-voltage photovoltaic power plant. [Figure 12] FIG. 11 is a block diagram showing a configuration example of an electric system of the photovoltaic power generation system of the present invention. [Modes for carrying out the invention]

[0017] The solar panels used in the solar power generation system of the present invention are thin, lightweight, and flexible perovskite-type solar panels. Perovskite-type solar panels include ordinary perovskite solar panels and, like general silicon-based solar panels, are made of monocrystalline silicon, but are made by thinning the monocrystalline silicon panel to the extreme (about 3 mm). The power generation efficiency of perovskite-type solar panels is the same as that of conventional solar panels, and because they are extremely thin, they have the characteristics of being resistant to bending and distortion despite being made of silicon, and being lightweight.

[0018] Furthermore, the photovoltaic power generation system of the present invention can be applied to all conventional photovoltaic power generation systems. It involves mounting or installing perovskite-type photovoltaic panels on top of existing photovoltaic panels, and achieving power generation, charging, and power supply (consumption) using the existing electrical system as is. Mounting or installing perovskite-type photovoltaic panels onto existing photovoltaic panels is done with double-sided tape or adhesive, so it can be constructed inexpensively, easily, and quickly.

[0019] Since the perovskite solar panels are installed or mounted on top of existing solar panels, there is no need to discard the existing solar panels, and the conventional electrical system can be used as is. Because perovskite solar panels are extremely lightweight, installing or mounting them on top of existing solar panels does not negatively affect the structural integrity of the existing solar panel structure.

[0020] Because the solar panels are thin and lightweight perovskite-type solar panels, they can be easily installed on curved surfaces and roofs, enabling the realization of a socially beneficial solar power generation system.

[0021] Embodiments of the present invention will be described below with reference to the drawings.

[0022] Figure 7 shows a perspective view of the perovskite-type solar panel 100 used in the present invention. The perovskite-type solar panel 100 is thin and lightweight, and also has a flexible function, allowing it to be mounted on bent or curved surfaces. The solar panel used in the present invention may be a perovskite solar panel, or it can also be applied to an ultra-thin type of silicon-based solar panel. Such a thin and lightweight perovskite-type solar panel is used.

[0023] The perovskite solar panel 100 is thin, lightweight, and flexible, so it can be attached with adhesive to building walls, roofs and walls of prefabricated warehouses, etc., as shown in Figure 8(A), and can be installed on roofs that cannot withstand the weight of conventional solar panels, such as container houses, as shown in Figure 8(B). It can also be easily installed on roofs with curved shapes, such as the rounded roofs often seen on gymnasiums, as shown in Figure 8(C).

[0024] Since the perovskite-type solar panel 100 used in this invention is thin and lightweight, in this invention, as shown in Figure 9(A), double-sided tape 110 is attached to the bottom surface of the panel, and the other side of the double-sided tape 110 is attached or installed on an existing solar panel 20, so that as shown in Figure 9(B), the perovskite-type solar panel 100 is installed on top of the existing solar panel 20. The lower solar panel 20 is in the shade and therefore does not generate electricity, and the perovskite-type solar panel 100, which is installed on top of the existing solar panel 20, is hit by the sun and generates electricity, so there is no need to discard the existing solar panel 20.

[0025] Figure 10 shows examples of the shape and arrangement of double-sided tape 110 to be attached to the bottom surface of a perovskite-type solar panel 100. Figure 10(A) shows an example in which double-sided tape 110 is layered over the entire back surface of the solar panel 100, and Figure 10(B) shows an example in which multiple rows of double-sided tape 110A are layered horizontally on the back surface of the solar panel 100. Figure 10(C) shows an example in which multiple rows of double-sided tape 110B are layered vertically on the back surface of the solar panel 100, and Figure 10(D) shows an example in which multiple small, separated double-sided tape pieces 110C are layered randomly on the back surface of the solar panel 100.

[0026] The above examples are not the only ones; any shape or arrangement that allows the perovskite solar panel 100 to be mounted or installed on the top surface of the solar panel 20 is acceptable.

[0027] In the solar power generation system of the present invention, the perovskite-type solar panel 100, which has double-sided tape 110 layered on its back surface, is installed on the top surface of the solar panels of a conventional existing solar power generation system, and electricity is generated using the newly installed perovskite-type solar panel 100. The solar panels of the conventional existing solar power generation system are not discarded but are used as is. In the electrical system of the solar power generation system, a switching unit (230) is provided to switch the electromotive force from the solar panels of the existing solar power generation system to the electromotive force from the newly installed perovskite-type solar panel 100, so that the conventional electrical system can be used as is.

[0028] Figure 11 shows high-voltage solar power plants 11, 12, and 13 installed on a conventional power generation site 10. Solar panels 20-1, 20-2, and 20-3 are installed on the frames and bases of the high-voltage solar power plants 11, 12, and 13, respectively, as described above. In the present invention, when these solar panels 20-1, 20-2, and 20-3 are nearing the end of their service life, perovskite-type solar panels 100-1 to 100-3, which have double-sided tape 110 attached to their bottom surfaces as described above, are attached or installed on the entire surface of each of the solar panels 20-1, 20-2, and 20-3. The perovskite-type solar panels 100-1 to 100-3 are firmly fixed on top of the solar panels 20-1, 20-2, and 20-3 by the double-sided tape 110. As a result, the newly installed perovskite-type solar panels 100-1 to 100-3 receive sunlight and generate electricity.

[0029] Figure 12 shows an example of the electrical system configuration for a power generation system using perovskite-type solar panels 100-1 to 100-n, corresponding to Figure 6, and uses almost the entire conventional electrical system as is. Specifically, a switching unit 230 is provided that inputs the conventional solar panels 20-1, 20-2, ..., 20-n to contacts a1, a2, ..., an, and inputs the perovskite-type solar panels 100-1, 100-2, ..., 100-n to contacts b1, b2, ..., bn. The switching unit 230 is designed to switch the input contacts when the perovskite-type solar panels 100-1 to 100-n are newly installed. In other words, when the perovskite solar panels 100-1 to 100-n are not installed, the switching unit 230 is connected to contacts a1 to an, and the power from the solar panels 20-1, 20-2, ..., 20-n is charged to the storage unit 211 via the switching unit 230 and the combining unit 210, and is also input to the inverter 213 via the switching control unit 212, where it is converted to alternating current (AC) and supplied to lighting fixtures 220, sensors 221, various electrical equipment 222, etc.

[0030] On the other hand, when perovskite-type solar panels 100-1 to 100-n are installed on top of solar panels 20-1 to 20-n, solar panels 20-1 to 20-n lose their power generation function, so the switching unit 230 is switched to contacts b1 to bn. As a result, the power generated by perovskite-type solar panels 100-1 to 100-n is input to the combining unit 210, and thereafter, power storage and power consumption are carried out as described above.

[0031] The electrical system may be formed by the wiring of the perovskite-type solar panels 100-1 to 100-n without providing the switching unit 230.

[0032] Although the above explanation used a solar power generation system on a mountainous or rural power generation site as an example, the same principles can be applied to rooftops and walls of buildings, roofs of supermarkets and other structures, and roofs of houses. [Explanation of symbols]

[0033] 1. Wind power generation 2. Biomass power generation 3. Hydroelectric power 4. Solar power 5. Geothermal power 6. Power companies 10. Site for power generation 11-13, 31 High-voltage solar power plants 20, 20-1~20-n solar panels 30 Commercial facilities 40 General housing 100 Perovskite Solar Panels 110 Double-sided tape 210 Synthesis section 211 Energy storage 212 Switching Control Unit 213 Inverter 220 Lighting fixtures 221 Sensors 222 Various electrical equipment 230 Switching section

Claims

1. A solar power generation system characterized by mounting or attaching a new solar panel to the surface of an existing solar panel, and supplying the electromotive force from the new solar panel to the electrical system of the existing solar panel.

2. The photovoltaic power generation system according to claim 1, wherein the new solar panel is a perovskite type solar panel.

3. The photovoltaic power generation system according to claim 1, wherein the new solar panel is a perovskite solar panel.

4. The photovoltaic power generation system according to any one of claims 1 to 3, wherein the aforementioned attachment or installation is performed using double-sided tape or adhesive.

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