JPH1052076A - Solar power system - Google Patents

Abstract

(57) [Problem] To provide a photovoltaic power generation system in which the shape of a solar cell array 1 can be a polygon so that a roof installation space can be effectively used. SOLUTION: A solar cell module 12 is formed in a quadrilateral, and a pair of positive and negative electrode terminals 13 for taking out DC power is provided on each side thereof. The electrode terminals 13 are connected to each other.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a photovoltaic power generation system that converts sunlight energy into electric energy for use.

[0002]

2. Description of the Related Art In recent years, photovoltaic power generation systems that convert solar energy into DC power using a solar cell and utilize the DC power have been promoted. In particular, there has been a remarkable progress in a solar power generation system for a private house in which a solar cell is installed on the roof of a house and the power consumed in the private house is covered by the power generated by the solar power generation. When a solar cell is installed on the roof of a new house, a roof building material integrated module that uses the solar cell as a part of the roof material has been commercialized. In addition, when connecting to the grid, the grid connection protection device, which must be installed, is built into the inverter as one of the components of the inverter. Photovoltaic power generation systems for home use have become comparable to general home appliances.

FIG. 6 shows a configuration example of a solar power generation system for a private house. Solar energy is solar cell array 1
Is converted into DC power and input to the inverter 3 via the connection box 2. The connection box 2 contains a backflow prevention diode and a DC switch. The DC power generated in the solar cell array 1 is converted into AC power by the inverter 3 and sent to the home distribution board 4 via the grid connection protection device 9. Then, the electric power is supplied from the home distribution board 4 to the home load 5. The household power distribution panel 4 is also connected to a power distribution system 8 via an outdoor switch 6 and a watt-hour meter 7.

[0004] When the interconnection operation with the distribution system 8 is performed, it is required to install a system interconnection protection device 9.
This is to prevent adverse effects on safety and power quality from being exerted on the interconnected power distribution system and other demand phenomena connected thereto. In the case of a residential photovoltaic power generation system, this grid operation protection device 9 is generally built in the inverter 3 as one of the components of the inverter 3 as described above.

Next, the configuration of the solar cell array 1 will be described. The solar cell array 1 is configured by combining a plurality of solar cell modules 12 as shown in FIG.
FIG. 5A shows three solar cell modules 12 connected in parallel, and FIG. 5B shows four solar cell modules 12 connected in series. That is, the solar cell module 12 is configured by arranging and wiring a required number of solar cell elements made of semiconductor on a base material, and providing a plastic film, a protective layer, a reinforced glass, an aluminum frame, and the terminal box 11. . Then, the respective solar cell modules are electrically connected by the wiring 10 to form the solar cell array 1.

[0006] As shown in FIG.
Due to the configuration of the electrode terminals (terminal box 11) of the solar cell module 12, they are usually formed in a rectangular shape surrounded by four sides and installed on a roof for a house. Residential roofs include
Since there are various forms such as gables, squares, ridges, gambling houses, etc., the series-parallel combination of the solar cell modules 12 is changed according to the form of the roof, and a quadrilateral solar cell array suitable for the installable space of the roof is provided. 1 is formed and installed on the roof.

[0007]

However, since the solar cell array 1 is generally formed in a quadrilateral, the solar cell array 1 can be installed only in a certain area.
This is because, as shown in FIG. 5, the terminal box 11 of the solar cell module 12 is provided as a pair of power terminals spaced apart in both side directions. in this way,
Since the pair of positive and negative electrode terminals are disposed apart in the direction of both sides of the solar cell module 12, the overall shape of the solar cell array 1 configured by combining a plurality of solar cell modules generally has a quadrilateral shape. For this reason, if the solar cell modules 12 are forcibly spread over the entire roof, the wiring connecting the electrode terminals becomes complicated.

Accordingly, an object of the present invention is to provide a photovoltaic power generation system in which the shape of a solar cell array can be made into a polygon so that the installation space of a roof can be effectively utilized.

[0009]

According to a first aspect of the present invention, a solar cell module is formed in a quadrilateral, and a pair of positive and negative electrode terminals for extracting DC power is provided on each side thereof, and the solar cell module is connected to another solar cell module. Is performed by connecting a pair of positive and negative electrode terminals on each side.

According to the first aspect of the invention, the connection between the solar cell modules is performed by connecting a pair of opposite positive and negative electrode terminals provided on each side.

According to a second aspect of the present invention, in the first aspect of the present invention, the solar cell module comprises a plurality of solar cell elements connected in parallel or in series or in a combination of parallel and series.
DC power is extracted from one of the pair of positive and negative electrode terminals on each side.

According to a second aspect of the present invention, in addition to the operation of the first aspect, the DC power from a plurality of solar cell elements connected in parallel or in series or in a combination of parallel and series is supplied to a pair of positive and negative sides of each side. It is taken out from one of the electrode terminals.

According to a third aspect of the present invention, in the first or second aspect, the solar cell module has a built-in inverter for converting DC power obtained by the solar cell element into AC power. The AC power is extracted from a pair of electrode terminals.

According to a third aspect of the present invention, in addition to the operation of the first or second aspect, each of the solar cell modules converts DC power obtained by the solar cell element into AC power by an inverter. And output while synchronizing with the AC power from the solar cell module.

According to a fourth aspect of the present invention, there is provided the first to third aspects.
In the invention, the solar cell module has a square shape.

According to the fourth aspect of the invention, in addition to the effects of the first to third aspects of the invention, the connection between the solar cell modules can be established regardless of which side of the solar cell module is adjacent.

The invention according to claim 5 is the invention according to claims 1 to 4.
In the invention, the pair of positive and negative electrode terminals of the solar cell module has a shape in which a positive electrode and a negative electrode are fitted.

According to a fifth aspect of the present invention, in addition to the functions of the first to fourth aspects, a pair of positive and negative electrode terminals of the solar cell module are fitted to each other to connect the solar cell modules.

According to a sixth aspect of the present invention, in the invention of the fifth aspect, the pair of positive and negative electrode terminals of the solar cell module is such that the positive electrode is concave, the negative electrode is convex, or the negative electrode is concave and the positive electrode is convex.

According to the sixth aspect of the present invention, in addition to the function of the fifth aspect, the positive electrode and the negative electrode are fitted with unevenness or unevenness, respectively.

According to a seventh aspect of the present invention, in the first aspect of the present invention, the solar cell array includes an inverter for converting DC power obtained by the solar cell element into AC power, and interconnection required for system operation. It comprises one parent solar cell module with a built-in protection device, and a plurality of child solar cell modules with a built-in inverter for converting DC power obtained by the solar cell element into AC power.

According to a seventh aspect of the present invention, in addition to the operation of the first aspect, each solar cell module converts DC power obtained by the solar cell element into AC power by an inverter,
Outputs while synchronizing with the AC power from the other solar cell modules, and outputs the AC power as the output of the solar cell array by linking with the power distribution system with the interconnection protection device in the parent solar cell module .

[0023]

Embodiments of the present invention will be described below. FIG. 1 is an explanatory diagram of the first embodiment of the present invention. Each side of the solar cell module 12 is provided with a pair of positive and negative electrode terminals 13a and 13b, respectively. As shown in FIG. 1, a certain number of solar cell elements 14 are connected in parallel, and DC power at both ends can be taken out from a pair of positive and negative electrode terminals 13a and 13b provided on each side. It has a configuration. That is, the pair of positive and negative electrode terminals 1 on each side of the solar cell module 12
DC power can be extracted from the electrode terminals 13 on any side of the reference numeral 3.

As shown in FIG. 1, the connection of the plurality of solar cell modules 12 is performed by rotating the other solar cell module 12 by 180 degrees with respect to one of the solar cell modules 12 so that the opposite side is positive or negative. A pair of electrode terminals 13a,
13b is connected. That is, the positive electrode terminal 13a of one solar cell module 12 is electrically connected to the negative power terminal 3b of the other solar cell module 12.

The shape of the pair of positive and negative electrode terminals 13a, 13b is such that the positive electrode and the negative electrode are fitted. For example,
It has a socket shape with a concave shape or a convex shape as shown in FIG. 1, and the solar cell module 12 is assembled so as to fit each other. Therefore, each electrode terminal 1
Since the connection between the three is connected in a socket shape, a special wiring technique and a wiring cable required for connecting the solar cell module 12 are not required. The solar cell array 1 can be easily formed simply by inserting the solar cell modules 12 one by one into a house roof.

Here, if the shape of the solar cell module 12 is a square having the same length on all four sides, the connection can be made regardless of which side is adjacent. Therefore, when the solar cell array 1 is formed by the square solar cell modules 12, the solar cell modules 12 can be connected regardless of which sides are adjacent to each other. Can be formed.

The electrical connection of the solar cell elements 14 constituting the solar cell module 12 is not limited to the above-described parallel connection, but may be in series or a combination of parallel and series. In addition, the shape of the electrode terminal 13 need not be an uneven socket shape as long as the shape allows contact between adjacent electrode terminals.

Next, a second embodiment of the present invention will be described. FIG. 2 is an explanatory diagram of the second embodiment of the present invention.
This second embodiment is different from the first embodiment shown in FIG. 1 in that an inverter 3 for converting DC power obtained by the solar cell element 14 into AC power is connected to each solar cell module. 12. Then, the DC power is converted into AC power while synchronizing with the AC power from the other solar cell modules 12. Other configurations are the same as those of the first embodiment shown in FIG.
The same elements are denoted by the same reference numerals and description thereof will be omitted.

In FIG. 2, an inverter 3 is a solar cell module 12
2 to be incorporated. Therefore, DC power generated by the solar cell element 14 can be extracted from the pair of positive and negative electrode terminals 13 on each side as AC power converted by the inverter 3. In this case, since a plurality of solar cell modules 12 are connected to take out the AC power, each AC power is taken out in synchronization. That is, the synchronization signal of the AC power of the power distribution system is sent to each of the solar cell modules 12, and the respective solar cell modules 12
From the power distribution system.

In the second embodiment, AC power can be extracted from the solar cell module 12, so that it is not necessary to separately provide the inverter 3, and the photovoltaic power generation system can be made compact.

Next, a third embodiment of the present invention will be described. FIG. 3 and FIG. 4 are explanatory diagrams of a third embodiment of the present invention. In the third embodiment, a solar cell array 1
Of the plurality of solar cell modules 12 constituting
The system link protection device 9 is incorporated in each of the parent solar cell modules 12A.

In FIG. 3, each solar cell module 12 has a built-in inverter 3 and these solar cell modules 12 are connected to the power distribution system 8. Then, the system interconnection protection device 9 is incorporated into the first parent solar cell module 12A connected to the power distribution system 8. The child solar cell module 12B incorporating the inverter 3 is connected to the parent solar cell module 12A. The parent solar cell module 12A sends a synchronization signal of the AC power on the power distribution system 8 side to the child solar cell modules 12B, and applies the AC power synchronized with the AC power on the power distribution system 8 side from each child solar cell module 12B to a terminal on each side. Take out from.

Here, the connection form of the parent solar cell module 12A and the child solar cell module 12B may be such that the solar cell modules 12 are arranged in a line as shown in FIG. It can also be a shape arranged in a shape. Further, in the embodiment described here, the solar cell modules 12 are connected in parallel with each other. However, by preparing the solar cell modules 12 to be connected in series according to the same concept, any connection in series / parallel can be performed. It becomes possible.

[0034]

As described above, according to the present invention, a solar cell array can be formed only by inserting a solar cell module, so that even a contractor having no special solar cell wiring technology can easily construct a solar cell array. Battery arrays can be installed on the roof. In addition, since the shape of the entire solar cell array is not limited to a quadrilateral and a polygonal solar cell array can be formed, the installation space of various housing roofs can be effectively utilized.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a solar cell module according to a first embodiment of the present invention.

FIG. 2 is a configuration diagram of a solar cell module according to a second embodiment of the present invention.

FIG. 3 is an explanatory diagram of a third embodiment of the present invention, and is a configuration diagram in a case where solar cell modules are arranged in a line and interconnected to a system.

FIG. 4 is an explanatory diagram of a third embodiment of the present invention, and is a configuration diagram in a case where solar cell modules are arranged in a polygonal form and interconnected to a system.

FIG. 5 is a connection diagram of a conventional solar cell module.

FIG. 6 is a configuration diagram showing a conventional solar power generation system for a private house.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Solar cell array 2 Connection box 3 Inverter 4 Household distribution board 5 Household load 6 Outdoor switch 7 Electricity meter 8 Distribution system 9 Grid connection protection device 10 Wiring 11 Terminal box 12 Solar cell module 13 Electrode terminal 14 Sun Battery element

Claims (7)

[Claims] 1. A solar cell module for connecting a plurality of solar cell elements to obtain DC power, forming a solar cell array by combining a plurality of the solar cell modules, and forming a solar cell array from the solar cell array. In a photovoltaic power generation system configured to convert DC power into AC power and supply AC power to a power load, the solar cell module is configured in a quadrilateral shape, and a pair of positive and negative for extracting DC power to each side thereof. An electrode terminal is provided, and the combination with another solar cell module is performed by connecting the pair of positive and negative electrode terminals on each side. 2. The solar cell module according to claim 1, wherein a plurality of solar cell elements are connected in parallel or in series or a combination of parallel and series, and direct current power is extracted from one of a pair of positive and negative electrode terminals on each side. The photovoltaic power generation system according to claim 1, wherein: 3. The solar cell module has a built-in inverter for converting DC power obtained by the solar cell element into AC power, and extracts AC power from a pair of positive and negative electrode terminals on each side. The photovoltaic power generation system according to claim 1 or 2, wherein: 4. The solar power generation system according to claim 1, wherein the solar cell module has a square shape. 5. The solar power generation system according to claim 1, wherein the pair of positive and negative electrode terminals of the solar cell module has a shape in which a positive electrode and a negative electrode are fitted. 6. The photovoltaic power generation system according to claim 5, wherein the pair of positive and negative electrode terminals of the solar cell module has a positive electrode concave, a negative electrode convex, or a negative electrode concave and a positive electrode convex. . 7. The solar cell array includes one inverter having a built-in inverter for converting DC power obtained by the solar cell element into AC power and an interconnection protection device required for system operation. The photovoltaic power generation according to claim 1, comprising: a battery module; and a plurality of sub-photovoltaic modules incorporating an inverter for converting DC power obtained by the solar cell element into AC power. system.