JPH0923019A - Photovoltaic power generation system having snow melting function - Google Patents

Abstract

PROBLEM TO BE SOLVED: To accurately melt fallen snow with a simple structure by utilizing a solar battery by connecting a switch circuit to the input-output terminal of a reverse-current preventing diode. SOLUTION: Since a switch circuit 6 is connected to the input-output terminal of a reverse-current preventing diode 4, a heat generating current can be made to flow to a solar battery 1 through the switch circuit 6 by by-passing the diode 4 at the time of making the heat generating current to flow to the solar battery 1. Therefore, the solar battery 1 can be made to generate heat with such a simple structure that the switch circuit 6 is connected to the circuit of a solar battery system. Moreover, when a bidirectional AC-DC converter 5 is used and the switch circuit 6 is connected to the converter 5 so as to make the heat generating current to flow to the battery 1, the heat generating current can be made to flow to the battery 1 with a simple structure. Therefore, fallen snow can be easily melted with the heat generated from the battery 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a solar power generation system having a snow melting function. More specifically, the present invention relates to a photovoltaic power generation system having a snow melting function, which can be suitably used as a photovoltaic power generation system for a snowy region, which is capable of accurately melting snow with a simple structure.

[0002]

A solar cell supplies electricity by converting the energy of sunlight into electric energy by means of solar cells. In recent years, solar cells have become widespread due to their high performance and low price. However, at the time of snowfall in the snowy region, the solar light receiving surface of the solar cell cannot receive sunlight due to the snowfall, the power generation capability is lost, and it is difficult to use the power generation system throughout the four seasons. For this reason, it is necessary for the photovoltaic power generation system installed in the snowy region to take measures to melt snow during snowfall.

FIG. 1 exemplifies a circuit diagram of a conventional grid-connected photovoltaic power generation system. Generally, in a conventional photovoltaic power generation system as shown in FIG. 1, a backflow prevention diode (4) is connected to prevent backflow of current generated by the solar cell (1) to the solar cell (1). ing. In general, the main material of a solar cell is a semiconductor, and thus it can be considered as a kind of heating element. However, in the conventional solar power generation system, the solar cell is required to have only a function for power generation and various developments have been made, but no attempt has been made to utilize the solar cell as a heating element. The present invention provides a system in which a solar cell is used as a heating element by applying an appropriate voltage to the solar cell from the outside, and the heat accumulated in the solar cell can melt the snow accumulated on the light receiving surface. is there.

In this case, when the solar cell is heated by supplying a heating current from an external power source to the solar cell using a conventional circuit, the backflow prevention diode (4) prevents the current from flowing to the solar cell. , I cannot energize. Further, if another circuit for heating the solar cell is added to this circuit, the structure becomes complicated. The present invention has been made in view of the circumstances as described above, and provides a photovoltaic power generation system having a snow melting function capable of accurately melting snow with a simple structure by using a solar cell as a heating element. The purpose is to do.

[0005]

As a solution to the above problems, the present invention provides sunlight having a snow melting function of melting snow by causing an electric current to flow through the solar cell to heat the solar cell. An electric power generation system, for preventing backflow of an external power supply circuit for giving a solar cell heat generation current to the solar power generation system and a solar cell power generation current provided in the solar power generation system to the solar cells. The snow melting function is characterized in that a fuse circuit for connecting the solar cell heating current from the external power supply circuit to the solar cell by bypassing the backflow prevention diode is connected to the input / output terminal of There is provided a solar power generation system having.

Further, the present invention is a solar power generation system of a grid interconnection type, which is characterized in that a switch circuit for making an AC-DC converter bidirectional is connected to the solar power generation system having a snow melting function. It also provides a power generation system.

[0007]

As described above, according to the present invention, a switch circuit is connected to the input and output ends of the backflow prevention diode, and when the heating current is passed, the switch circuit is passed to bypass the backflow prevention diode and bypass the solar cell. Can be energized. As a result, the solar cell can generate heat with a simple structure in which the switch circuit is connected to the circuit of the conventional solar power generation system. Further, by making the AC-DC converter bidirectional and connecting a switch circuit for supplying a solar cell heating current to the solar cell, the current for heating the solar cell can be transferred to the solar cell with a simple structure. Can be energized. Therefore, snow can be easily melted by the heat generated by the solar cell.

Hereinafter, the present invention will be described in more detail with reference to examples. Of course, the present invention is not limited by the following examples.

[0009]

【Example】

(Embodiment 1) FIG. 2 is a circuit diagram of a solar power generation system having a snow melting function, which is an embodiment of the present invention. This solar power generation system has a structure in which a switch circuit (6) is connected to the input and output ends of a backflow prevention diode (4). By passing the solar cell heat generation current through the switch circuit (6), the backflow prevention diode is bypassed to energize the solar cell (1) to heat the solar cell.

In this embodiment, a switch circuit is provided which energizes the solar cell heating current from the external power supply circuit to the solar cell by bypassing the backflow prevention diode. It is also possible to generate heat in the solar cell by providing a switch circuit that operates. (Embodiment 2) FIG. 3 is a circuit diagram of a solar power generation system having a snow melting function, which is another embodiment of the present invention. This solar power generation system has a structure in which a switch circuit (7) is connected between a backflow prevention diode (4) and a bidirectional AC-DC converter (5). FIG. 4 shows a configuration diagram of this switch circuit. This switch circuit consists of two switches 1
It has a structure in which two pairs of switches are connected. By opening and closing these two pairs of switches, it is possible to reverse the positive and negative polarities of the AC-DC converter to supply a current to the solar cell (1).

The solar cell of the solar power generation system having the snow melting function of the present invention is covered with a black vinyl bag, and a standard current generator is used as an external power supply circuit.
A current of A was applied to the circuit. FIG. 5 is a diagram showing the temperature rise of the solar cells in the solar power generation system having the snow melting function of the present invention at this time. It has been shown that the cell temperature of the solar cell is increased after energization, and in particular, in this experimental example, a temperature rise of about 10 degrees from room temperature was observed 1 hour after energization. As described above, in the present invention, snow melting can be performed by a very simple means by using the solar cell as a heating element.

[0012]

As described in detail above, the present invention utilizes a solar cell as a heating element, can generate heat with a simple structure, and can efficiently melt snow accumulated on the solar cell. It will be possible to use solar cells throughout the four seasons. In addition, electricity costs can be saved by performing the snowmelt by using nighttime electricity. Furthermore, by installing this solar power generation system on the entire roof, it is possible to omit snow removal work in heavy snow regions and the like.

[Brief description of drawings]

FIG. 1 is an example of a circuit diagram of a conventional grid-connected photovoltaic power generation system.

FIG. 2 is a circuit diagram of a solar power generation system having a snow melting function, which is an embodiment of the present invention.

FIG. 3 is a circuit diagram of a photovoltaic power generation system having a snow melting function, which is an embodiment of the present invention.

FIG. 4 is a configuration diagram of a switch circuit.

FIG. 5 is a diagram showing a temperature rise of a solar cell when a current is applied to the solar power generation system having a snow melting function of the present invention.

[Explanation of symbols]

 1 Solar cell 2 Bypass diode 3 Fuse 4 Backflow prevention diode 5 AC-DC converter 6 Switch circuit 7 Switch circuit

Claims (3)

[Claims] 1. A photovoltaic power generation system having a snow melting function of causing heat to be generated in a solar cell by causing an electric current to flow through the solar cell from the outside to melt snow. 2. A solar power generation system having a snow-melting function for causing the solar cell to generate heat by causing an electric current to flow from the outside to melt snow, and to supply the solar cell power generation current to the solar power generation system. And an input / output terminal of a backflow prevention diode for preventing the backflow of the solar cell power generation current provided in the solar power generation system to the solar cell for the solar cell heat generation from the external power supply circuit. A solar power generation system having a snow melting function, which is connected to a switch circuit for passing a current to a solar cell by bypassing a backflow prevention diode. 3. A grid-connected photovoltaic power generation system, wherein an AC-DC converter is bidirectional, and a switch circuit for supplying a solar cell heating current to the solar cell is connected. Photovoltaic power generation system with snow melting function.