JPH09308103A - Solar cell application equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable its one part at least to be used without breaking the output of a solar battery completely by providing this apparatus with a cable for drawing out of power drawn out from the middle point of the series connection of a solar battery array. SOLUTION: A solar battery array can output power when it receives the insulation of the sun, and this is led to an inverter 3 of a reverse power flow linked to the system. Here, a specified middle point 11 to connect the solar battery array 1 in series is provided, and a low-voltage output terminal 12 is provided on the extension of the power cable lead wire 2. Hereby, the takeout of the power at lower voltage than the high voltage at the time of having operated all of the solar battery array becomes possible. Load used for both AC and DC or DC load such as a water pumping pump, etc., is connected to a low-voltage output terminal. Accordingly, the effective use of the power outputted by the solar battery array 1 becomes possible, without the complete break of the output of the solar battery array 1 as before, the utilization efficiency of an apparatus where the solar battery is applied can be improved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a solar cell application device in which a solar cell is combined with a grid-connected reverse flow inverter, a charge control device, a storage battery, and the like, and in particular, a solar cell array in which solar cell modules are serialized. The present invention relates to a solar cell application device in which a connection electric wire for extracting electric power is provided at an intermediate point of the series connection of (1) to obtain a low-voltage voltage output.

[0002]

2. Description of the Related Art Conventionally, a solar cell application device of this type having a structure shown in FIG. 2 is known. In the figure,
1 is a solar cell array, 3 is a grid-connected reverse flow inverter,
Reference numeral 4 is a system power supply, 5 is indoor power distribution, and 1a, 1b, ... are solar cell modules or solar cell units constituting the solar cell array 1. The solar cell array 1 has a structure in which a plurality of solar cell modules are serially connected to generate high-voltage DC power in order to improve efficiency during power transmission or to satisfy ease of handling during wiring. ing. The system power supply 4 is an AC power supply supplied from an electric power company, and the indoor power distribution 5 is an electric line for delivering electric power consumed in a building.

The solar cell array 1 outputs electric power when it receives sunlight from the sun, but when it is supplied from the system power source 4 and the solar cell array 1 has an output, the system interconnection reverse connection is performed. The power flow inverter 3 is operated and the output of the solar cell array 1 is used. Then, when the output of the solar cell array 1 exceeds the consumption of the indoor power distribution 5, electric power is sent back to the system power supply 5 (reverse flow).

[0004]

However, in the above-mentioned conventional example, if the input from the system power source 4 is interrupted due to a disaster or accident, the output of the solar cell array 1 can be obtained in the daytime. Despite that, for safety, the grid-connected reverse flow inverter 3 is stopped,
It is usual to cut off the input from the solar cell array 1 or the output to the system power source 4 or the indoor power distribution 5, and therefore, the output of the solar cell array 1 cannot be utilized and the consumption is relatively low. There is a problem that even the user's need to use a load such as an electric light that can be used with electric power cannot be satisfied, and as a result, the efficiency of system operation is also reduced. Further, there is a similar problem when an accident occurs in the indoor power distribution 5.

The present invention has been made in view of the problems in the above-mentioned conventional example, and the solar cell is used even during a power failure of the system power supply, an accident of another load connected to the same system, or a stop due to maintenance. It is intended to improve the efficiency of system operation by making it possible to use only a part of the output without completely shutting off the output.

[0006]

In order to achieve the above object, according to the present invention, in a solar cell application device provided with a solar cell array in which solar cell modules are used in series, an intermediate portion of the series connection of the solar cell arrays is provided. It is characterized in that an electric wire for drawing out electric power drawn from a point is provided.

In a preferred embodiment of the invention,
A charging control switch or element is provided in series on the electric power drawing wire, and a secondary battery is connected in parallel to the solar cell module constituting the solar cell array via the charging control switch or element. A charge control device may be used instead of the charge control switch or element. Further, a plurality of electric power drawing wires may be drawn from each of a plurality of intermediate points in the series connection of the solar cell arrays.

[0008]

In general, a system of photovoltaic power generators that performs a grid-tied reverse power flow has a structure in which solar cell modules are connected in series and high-voltage DC is applied to both ends of the solar cell array in order to improve the utilization efficiency of wiring and conversion equipment. It generates and uses a voltage. Therefore, each array is usually constructed by connecting a plurality of solar cell modules of smaller units in series, so if you take out the connecting lead wire from the midpoint of them, you will get the original solar cell array. The voltage output of the lower voltage used can be obtained, and a safe and easy-to-use power source can be obtained. Also, if you take out the lead wires by the number of serially divided outputs from this solar cell array,
A plurality of DC powers that are easy to handle can be used.

In order to solve the above problems, the present invention is directed to solving the above-mentioned problems. In a solar cell application device for system interconnection, a predetermined number of solar cell arrays are formed by connecting solar cell modules in series. By taking out the leader line from the point that is only divided, the electric power output by the solar cell is used safely and effectively when the system power supply is cut off for some reason.

If a solar cell applied device that divides and draws out every predetermined number of series in the unit of the solar cell module that constitutes the solar cell array as described above is used, for example, in a system of system interconnection reverse power flow, Even if is cut off, DC power can be obtained from each of the divided modules and used. In addition, in the case of a system with a secondary battery, it is also possible to take out power from the connection lead wires that were taken out in splits during normal operation at the same time as the grid interconnection inverter operation, and charge the secondary battery with that current. Is.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. [First Embodiment] FIG. 1 shows the configuration of a solar cell application device according to a first embodiment of the present invention. In the figure, 1 is a solar cell array, 2 is a power drawing wire, 3 is a grid-connected reverse power flow inverter, 4 is a system power supply, 5 is indoor power distribution, 11 is a predetermined intermediate point, and 12 is a low-voltage output terminal. The output of the solar cell array 1 is normally input to the grid-connected reverse power flow inverter 3, the system power supply 4 is supplied, and the solar cell array 1 is capable of generating power by receiving solar radiation from the sun. At times, the grid-connected reverse power flow inverter 3 is operated to send electric power to the grid power supply 4.

First, in FIG. 1, when the solar cell array 1 receives solar radiation, the solar cell array 1 can output electric power, which is led to the grid interconnection reverse power flow inverter 3. . Then, normally, when the grid power supply 4 is being supplied, the grid interconnection reverse power flow inverter 3 operates, and the DC power input from the solar cell array 1 to the grid interconnection reverse power flow inverter 3 is AC. Converted to electricity. At this time, when the amount of power generated by the solar cell array 1 exceeds the amount of power consumed by the indoor power distribution 5, the generated power is reversely flowed to the grid power supply 4. Up to this point, it is the same as the conventional example shown in FIG.

Here, in the solar cell application device of the present embodiment, a predetermined intermediate point 11 for connecting the solar cell array 1 in series is provided, and the power lead line 2 is connected to this, and the power lead line 2 is connected. A low-voltage output terminal 12 is provided on the extension, and this makes it possible to take out electric power at a lower voltage than the high voltage when all the solar cell arrays 1 are operated. To the low-voltage output terminal 12, a load for both direct and alternating use such as an electric light or a DC load such as a pumping pump is connected. Alternatively, an AC load can be connected via an inverter or the like.

The solar cell application device of this embodiment is constructed and operates as described above, and therefore has the following effects. Even when the input of the system power supply 4 is cut off, there is no complete cutoff of the output of the solar cell array 1 which has occurred conventionally, and the low voltage output from the predetermined intermediate point 11 Output is available,
The electric power output from the obtained solar cell array 1 can be effectively used, and the utilization efficiency of the solar cell application device can be improved. In addition, since the output voltage to be used can be set lower than the normal operating voltage, it is possible to make it safe with little leakage or electric shock during operation or handling.

[Second Embodiment] In the first embodiment,
Although it can be used in the daytime, there is a problem that it cannot be used in the nighttime when the output of the solar cell array 1 cannot be obtained. Corresponding to this, an embodiment in which a secondary battery is combined, which can be used at night, and in consideration of user convenience will be described.

FIG. 3 shows the configuration of a solar cell application device according to the second embodiment of the present invention. In the figure, 1 is a solar cell, 2 is a power drawing wire, 3 is a grid-connected reverse power flow inverter, 4 is a system power supply, 5 is indoor power distribution, 6 is a charging control switch or element, 7 is a secondary battery, Reference numeral 11 is a predetermined intermediate point, and 12 is a low voltage power terminal.

First, in FIG. 3, when the solar cell array 1 receives solar radiation from the sun, the solar cell array 1 can output electric power, which is led to the grid interconnection reverse power flow inverter 3. . Then, normally, the grid interconnection reverse power flow inverter 3 operates when the grid power supply 4 is supplied, and the DC power input from the solar cell array 1 to the grid interconnection reverse power flow inverter 3 is AC power. Is converted to. At this time, when the amount of power generated by the solar cell array 1 exceeds the amount of power consumed by the indoor power distribution 5,
The generated power is reversely flowed to the system power supply 4.

Here, in the solar cell application device of this embodiment, the predetermined intermediate point 11 is added to the solar cell array 1.
Is provided, and the power lead-out line 2 is connected to this, and the low-voltage output terminal 12 is provided on the extension of the power lead-out line 2, so that the voltage is lower than the high voltage when all the solar cell arrays 1 are operated. Electric power can be taken out, and the process up to this point is the same as in the first embodiment.

In the present embodiment, a charging control switch or element 6 is further provided in series between the predetermined intermediate point 11 on the electric power drawing wire 2 and the low voltage output terminal 12, and the charging thereof is performed. A secondary battery 7 is provided in parallel between the electric power drawing wire 2 and a reference potential point via a control switch or element 6. With this configuration, even when the input of the system power supply 4 is cut off, the electric power of the solar cell array 1 output from the predetermined intermediate point 11 as in the first embodiment. Of the solar cell array 1 is stored in the secondary battery 7 through the switch or the element 6, and the solar cell array 1 can be used even at night when the solar radiation of the sun is not received. It becomes possible to use low-voltage power, which can be convenient for the user.

[Third Embodiment] In the second embodiment, the predetermined intermediate point 11 of the solar cell array 1 to the secondary battery 7 are connected by a simple switch or element, which is charged. You may make it connect with a control apparatus.

FIG. 4 shows a third embodiment of the present invention in which a secondary battery is connected via a charge control device. In the figure, 1
Is a solar cell, 2 is a power drawing wire, 3 is a grid-connected reverse flow inverter, 4 is a system power supply, 5 is indoor power distribution, 7 is a secondary battery, 8 is a charging control device, 11 is a predetermined intermediate point, 12
Is a low voltage output terminal. In the present embodiment, a charge control device 8 is further arranged between the predetermined intermediate point 11 of the solar cell array 1 and the secondary battery 7 to output the power of the solar cell array 1 by the secondary battery. 7 and the secondary battery 7 is prevented from being overcharged.

First, referring to FIG. 4, when the solar cell array 1 receives solar radiation, the solar cell array 1 can output electric power, which is led to the grid interconnection reverse power flow inverter 3. . Then, normally, when the grid power supply 4 is being supplied, the grid interconnection reverse power flow inverter 3 operates, and the DC power input from the solar cell array 1 to the grid interconnection reverse power flow inverter 3 is AC. Converted to electricity. At this time, when the amount of power generated by the solar cell array 1 exceeds the amount of power consumed by the indoor power distribution 5, the generated power is reversely flowed to the grid power supply 4.

Here, in the solar cell application device of this embodiment, the predetermined intermediate point 11 is added to the solar cell array 1.
By providing the above, it is possible to take out electric power at a voltage lower than the high voltage when all of the solar cell array 1 is operated, and this is the same as in the first and second embodiments up to this point.

In this embodiment, the predetermined intermediate point 11 on the electric power drawing wire 2 and the low voltage output terminal 1 are connected.
The charging control device 8 is provided between the solar cell array 1 and the power supply of the solar cell array 1 even when the input of the system power supply 4 is cut off. The solar cell array 1 can be used at a low voltage, and the generated power of the solar cell array 1 is stored in the secondary battery 7 via the charge control device 8 so that the low voltage from the solar cell array 1 can be received even at night when the sun is not exposed to the sun. It is possible to use the electric power of, and it is possible to improve the convenience of the user.

Further, by providing the charge control device 8, the secondary battery 7 can be charged more easily than in the case of manually operating the switch or the device 6 by using the switch or the device 6 in the second embodiment. And the secondary battery 7
Can be prevented from being overcharged, and a reverse voltage can be prevented from being applied to the solar cell array 1 from the predetermined intermediate point 11 by the secondary battery. Therefore, the reliability of the solar cell array 1 can be improved. It is possible to improve the sex.

[Fourth Embodiment] In the first to third embodiments, a single predetermined intermediate point is set for simplification, but a plurality of predetermined intermediate points are set, and a plurality of the set plurality of intermediate points are set. The output of the solar cell array may be obtained from a predetermined intermediate point.

FIG. 5 shows a fourth embodiment in which outputs are taken out from a plurality of intermediate points of the solar cell array. In the figure, 1 is a solar cell, 2a, 2b and 2c are power drawing wires, 3 is a grid-connected reverse power flow inverter, 4 is a system power supply, 5 is indoor power distribution, 11a, 11b and 11c are predetermined intermediate points, 12a, 12b, 12c are low voltage output terminals,
In this solar cell applied device, the predetermined intermediate points, which are the series connection points of the solar cell array 1, are connected to 11a, 11b, 11
c and a plurality of them are provided, and the power lead lines are 2a, 2
a plurality of low voltage output terminals 12a, 12b, and 12c are provided on the extension of these terminals.

First, in FIG. 5, when the solar cell array 1 receives solar radiation, the solar cell array 1 can output electric power, which is led to the grid interconnection reverse power flow inverter 3. . Then, normally, the grid interconnection reverse power flow inverter 3 operates when the grid power supply 4 is supplied, and the DC power input from the solar cell array 1 to the grid interconnection reverse power flow inverter 3 is AC power. Is converted to. At this time, when the amount of power generated by the solar cell array 1 exceeds the amount of power consumed by the indoor power distribution 5,
The generated power is reversely flowed to the system power supply 4.

Here, in the solar cell application device of this embodiment, the predetermined intermediate point is set to 1 in the solar cell array 1.
1a, 11b, 11c are provided in plurality, the power lead-out lines are respectively connected to 2a, 2b, 2c, respectively, and the low voltage output terminals 12a, 12b, 12c on these extensions are provided in plurality, and thus the solar cell array 1 It is possible to take out a plurality of low-voltage electric power rather than a high-voltage electric power when all are operated.

As a result, even if the input of the system power supply 4 is cut off, the solar cell array 1 output from the predetermined intermediate point as in the first embodiment is output. Since the electric power is low and a plurality of electric powers can be used, the electric power of the solar cell array 1 can be used more efficiently and the convenience of the user can be improved.

[0031]

Scope of application of the invention The predetermined intermediate points 11a, 11b and 11c in the above embodiment may be obtained by arbitrarily dividing the solar cell array 1 or the module,
It can be in a module. Further, in the above description, the output of the solar cell array 1 is described as being connected to the grid-connected reverse power flow inverter 3 for the sake of convenience, but the present invention uses the output of the solar cell array 1 as a grid power supply. It is also possible to apply to a device used independently without cooperation, or a device used as it is without being converted into an alternating current. Further, the present invention does not limit the configuration of the solar cell application device by combining the above-described embodiments.

In the above description, the solar cell application device of the present invention is described as functioning and effective only when the grid power supply 4 is cut off and the grid interconnection reverse power flow inverter 3 is stopped for the sake of convenience. However, in the present invention, the system power supply 4 is not cut off and the system interconnection reverse power flow inverter is operating, or even if the system power supply is cut off, only the system interconnection reverse power flow inverter is present. It does not limit the extraction of electric power from the predetermined intermediate point in the operating state.

[0033]

As described above, according to the present invention,
Even when the input of the system power supply 4 is cut off, there is no complete cutoff of the output of the solar cell array as has occurred in the past, and the low voltage output taken out from the predetermined intermediate point is not output. It is possible to use the obtained electric power of the solar cell array effectively, and it is possible to improve the utilization efficiency of the solar cell application device. In addition, since the output voltage to be used can be set lower than the normal operating voltage, it is possible to make it safe with little leakage or electric shock during operation or handling.

[Brief description of drawings]

FIG. 1 is a block diagram showing an overall configuration of a solar cell application device according to a first embodiment of the present invention.

FIG. 2 is a block diagram showing an overall configuration of a conventional solar cell application device.

FIG. 3 is a block diagram showing an overall configuration of a solar cell applied device according to a second embodiment of the present invention.

FIG. 4 is a block diagram showing an overall configuration of a solar cell applied device according to a third embodiment of the present invention.

FIG. 5 is a block diagram showing an overall configuration of a solar cell applied device according to a fourth embodiment of the present invention.

[Explanation of symbols]

1: Solar cell array, 1a, 1b, 1c ...: Solar cell module, 2, 2a, 2b, 2c: Electric power drawing wire, 3: Grid-connected reverse power flow inverter, 4: Grid power supply, 5: Indoor Power distribution, 6: Charge control switch or element, 7: Secondary battery, 8: Charge control device, 1
1, 11a, 11b, 11c: predetermined intermediate points, 12,
12a, 12b, 12c: low voltage output terminals.

Claims (4)

[Claims] 1. A solar cell application device comprising a solar cell array in which solar cell modules are used in series,
A solar cell application device comprising an electric power drawing wire drawn from an intermediate point of the series connection of the solar cell arrays. 2. The solar cell module according to claim 1, wherein a charge control switch or element is provided in series on the electric power drawing wire, and the solar cell array is configured via the charge control switch or element. A solar cell applied device characterized in that a secondary battery is connected in parallel to the. 3. The solar cell application device according to claim 2, wherein the secondary battery is connected using a charge control device instead of the charge control switch or element. 4. The electric power drawing wire according to claim 1, 2 or 3, wherein the electric power drawing wires are drawn from a plurality of intermediate points of the series connection of the solar cell arrays, and a plurality of low voltage power output terminals are provided. Solar cell application equipment.