JP2000040838A - Abnormality detector for solar power generating facility - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an abnormality detector for solar power generating facility in which an abnormality can be detected surely through a simple facility while facilitating inspection and simplifying operation management. SOLUTION: The abnormality detector comprises a circuit 7 for comparing power generated from solar cells 1 with a theoretical generation power determined from the quantity of solar radiation detected by a quantity of solar radiation sensor 3, and a circuit 8 for making a decision that the solar cell 1 is abnormal if the difference of power compared by the circuit 7 is higher than a specified level and delivering an abnormality signal. Generation power drop due to surface contamination of the solar cell 1, breakage of inter-cell wiring or ground fault can thereby be detected easily and abnormality can be informed to the outside.

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 facility abnormality detecting apparatus.

[0002]

2. Description of the Related Art In a photovoltaic power generation system, a solar cell body is usually installed outdoors, so that it is exposed to the weather and the atmosphere, and its surface is affected by fouling. Will decrease. Further, when connecting a plurality of solar cells, disconnection or ground fault may occur at the wiring portion or the connection portion.

Conventionally, the surface of a solar cell has been periodically cleaned to remove stains, and abnormalities in the wiring and connection portions have been found by checking the wiring and measuring the insulation resistance during inspection.

[0004]

However, detecting the contamination of the surface of the solar cell and the disconnection or ground fault of the wiring and connection parts is very troublesome, and therefore, the abnormality of the photovoltaic power generation equipment that can be easily and simply implemented. There has been a demand for the development of a detection device.

SUMMARY OF THE INVENTION The present invention (claim 1) has been made to meet the above-mentioned demand, and an object of the present invention is to make it possible to reliably detect abnormalities with simple equipment, to perform easy inspection and to simplify operation management, and the like. An object of the present invention is to provide a possible solar power generation facility abnormality detection device.

[0006]

In order to achieve the above object, an abnormality detecting device for a photovoltaic power generation system according to the present invention comprises an electric power generated by a solar cell and an amount of solar radiation detected by a solar radiation sensor. A comparison operation circuit for comparing the theoretically generated power obtained therefrom, and an external output circuit for judging that the solar cell is abnormal when the power difference compared by the comparison operation circuit is larger than a predetermined value and outputting an abnormality signal to the outside. The feature is that. According to the first aspect, by comparing and calculating the amount of solar radiation and the generated power, it is possible to detect an abnormality when the generated power is reduced due to surface contamination of the solar cell, disconnection of the inter-battery wiring, ground fault, or the like. Is what you do.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a configuration diagram of a first embodiment (corresponding to claim 1) of the present invention. As shown in the drawing, the abnormality detection device for a photovoltaic power generation facility of the present embodiment includes a plurality of solar cells 1
A power generator 2 for inputting electric power generated by the solar cell 1, an insolation sensor 3 for receiving insolation from the sun, an insolation calculation circuit 4 for inputting an insolation detected by the insolation sensor 3, A temperature sensor 5 for measuring the temperature of the power generation equipment, a temperature calculation circuit 6 for inputting the temperature detected by the temperature sensor 5, a comparison calculation circuit for inputting output signals of the power generator 2, the solar radiation calculation circuit 4, and the temperature calculation circuit 6. 7 and a comparison operation circuit 7
Output circuit 8 and external signal 9 for outputting the result of
And load equipment 1 to which the power generated by the power generator 2 is supplied.
0.

Next, the operation of this embodiment will be described.
The power generated by the solar cell 1 that has received light energy from the sun is converted into predetermined conditions by the power generator 2, and the load equipment 1
Sent to 0. On the other hand, the solar radiation sensor 3 receives solar radiation from the sun, and the solar radiation amount is input to the solar radiation calculation circuit 4. The solar radiation calculation circuit 4 calculates the calculated power generated by the solar cell 1 based on the input solar radiation. This is because the output of the solar cell 1 changes each time depending on the area and type of the battery. The power generation output signal from the power generation device 2 and the power generation output signal from the solar radiation calculation circuit 4 are
The actual generated power and the theoretical generated power calculated from the amount of solar radiation are compared. In addition, in the comparison operation circuit 7, since the output of the solar cell also changes depending on the temperature, it is necessary to perform correction based on the air temperature signals from the air temperature sensor 5 and the air temperature operation circuit 6. As a result of the comparison operation, when the solar power is lower than the theoretical power by a predetermined value or more, the external output circuit 8 outputs an external signal 9 to notify the abnormality.

As described above, according to the present embodiment, the power generated by the solar cell is compared with the theoretical power based on the amount of solar radiation, and when the generated power is lower than the theoretical power, a signal is output to the outside. Is output to notify the abnormality. With this output signal, it is possible to detect an abnormality due to surface contamination of the solar cell, disconnection of the inter-cell wiring, ground fault, and the like. Therefore, it is possible to easily and reliably detect an abnormality such as soiling of the battery surface of the photovoltaic power generation facility, disconnection of the inter-battery wiring and ground fault.

FIG. 2 is a block diagram of a second embodiment (corresponding to claim 1) of the present invention. This embodiment is different from the first embodiment in FIG. 1 only in that the solar cell and the power generator correspond to each other on a one-to-one basis, and other configurations are the same. The description will be made with reference to FIG.

As shown in the figure, the abnormality detecting device for a photovoltaic power generation system according to the present embodiment comprises a plurality of solar cells 1, each power generating device 2 for inputting electric power generated by each solar cell 1, and Solar radiation sensor 3 receiving solar radiation, and solar radiation sensor 3
A solar radiation calculation circuit 4 for inputting the amount of solar radiation detected in step 1, a temperature sensor 5 for measuring the temperature of the solar power generation facility, and a temperature sensor 5
A temperature calculation circuit 6 for inputting the temperature detected by the above, a comparison calculation circuit 7 for inputting output signals of the respective power generators 2, the solar radiation calculation circuit 4 and the temperature calculation circuit 6, and a result of the comparison calculation circuit 7 output to the outside. It comprises an external output circuit 8, an external signal 9, and a load facility 10 to which the power generated by the power generator 2 is supplied.

Normally, the solar cell 1 may have a large number of cell configurations depending on the output and installation space. In this case, in order to determine which component of the solar cell 1 has an abnormality, the comparison operation circuit 7 is configured to perform an operation for each solar cell configuration. Therefore, it is possible to easily specify which solar cell is abnormal. The other operations are the same as those in the first embodiment, and will not be particularly described.

[0013]

As described above, the present invention (Claim 1)
According to (response), it is possible to reliably detect the abnormality of the photovoltaic power generation equipment with simple equipment, and to easily perform maintenance and inspection and simplify operation management.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a first embodiment of the present invention.

FIG. 2 is a configuration diagram of a second embodiment of the present invention.

FIG. 3 is a configuration diagram of a conventional solar power generation facility.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Solar cell, 2 ... Power generation device, 3 ... Solar radiation sensor, 4 ...
Solar radiation calculation circuit, 5 ... temperature sensor, 6 ... temperature calculation circuit, 7
... Comparison operation circuit, 8 ... External output circuit, 9 ... External signal, 1
0: Load equipment.

Claims (1)

[Claims] 1. A comparison operation circuit for comparing the power generated by a solar cell with a theoretically generated power obtained from the amount of insolation detected by an insolation amount sensor, and when the power difference compared by the comparison operation circuit is larger than a predetermined value. An abnormality detection device for a photovoltaic power generation facility, comprising: an external output circuit that determines that the solar cell is abnormal and outputs an abnormality signal to the outside.