JP2000214938A - Solar battery abnormality warning device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To evade unnecessary alarm generation by giving an alarm when hours wherein the mean output current value of a specific solar battery circuit decreases below a rate set for a solar battery circuit having a maximum mean output current value increase above set hours. SOLUTION: A solar battery current measurement part 17 measures mean output current values I1, I2...In of respective solar battery circuits. A mean output current arithmetic part 18 finds the mean output currents of the respective solar batteries in unit times. On the basis of the largest value among the mean output currents of the respective solar battery circuits in the unit times as a reference value, a mean current rate arithmetic part 19 calculates the rates of the mean output current values of other solar battery circuits to the reference value. A current decrease circuit detection part 20 detects a solar battery circuit whose mean current rate is less than a set value. A successive number count part 21 for current decrease unit times counts the successive current drop unit times of the current decrease circuit and sends out a signal for making an alarm generation device 13 to perform alarming operation when the count value exceeds a set value.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a solar cell abnormality alarm device for notifying an abnormality of a solar cell circuit in a solar power generation system using a plurality of solar cell circuits as a power source.

[0002]

2. Description of the Related Art Conventionally, a photovoltaic power generation system is as shown in FIG. That is, the solar power generation system 31
Is, for example, a plurality of solar cell modules 32 connected in series mounted on the roof of a house, a DC circuit breaker 33, a surge absorber 34, a diode 35, and a DC ammeter 36.
.., S
Connection box 37 for connecting Cn ′ and solar cell module 3
And a power conditioner 38 that converts the DC power generated in Step 2 into AC power. In this solar power generation system, the solar cell circuits SC1 ′, SC2 ′,
.., SCn ′, to read the indicated value of the DC ammeter 36 provided in each of the solar cell circuits SC1 ′, SC2 ′,. It was determined to be normal if shown, and to be abnormal if one circuit showed a different value compared to other circuits.

[0003]

However, according to the conventional photovoltaic power generation system described above, in the case of a general home photovoltaic power generation system, the user may not be able to detect an abnormality in the solar cell circuit from the pointer of the DC ammeter. However, there is a drawback that an abnormality can be found only at the time of a regular inspection by a specialist, resulting in a large economic loss.

[0004] In addition, even when the inspection is performed by a specialist, a correct judgment can be made only when the solar cell module is uniformly irradiated with sunlight, so that there is a problem that the schedule, weather and sunshine conditions of the inspector are affected. there were.

[0005]

SUMMARY OF THE INVENTION In view of the above-mentioned problems of the conventional photovoltaic power generation system, it is an object of the present invention to reduce the possibility that an unnecessary alarm will be issued and to detect the abnormality of the photovoltaic cell circuit without specialized knowledge. Provided is a solar cell abnormality alarm device that can be known. In a solar power generation system using a plurality of solar cell circuits as a power source, an average output current value per unit time of each solar cell circuit is obtained, and the average output current value is calculated. Compares the average output current value of the largest solar cell circuit with the average output current value of other solar cell circuits, and calculates the ratio of the average output current value of a specific solar cell circuit to the maximum average output current value of the solar cell circuit. When the number of hours that decreases below is equal to or longer than the set time, an alarm is issued to the effect that the solar cell circuit is abnormal.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS When an abnormality occurs in any of the solar cell circuits, the output current decreases, and the solar cell current measuring section detects this. The continuation number counting section starts counting when the average current value per unit time falls below the judgment level, and the alarm device issues an alarm when the continuation number of the output current reduction unit time becomes equal to the set value.

[0007]

1 to 4 show an embodiment of a solar cell abnormality alarm device according to the present invention. Hereinafter, the present invention will be described with reference to the drawings.

The solar power generation system 1 includes, for example, a plurality of solar cell modules 2 connected in series mounted on a roof of a house, a DC circuit breaker 3, a surge absorber 4, a diode 5, a solar cell abnormality alarm device. , SCn, and the connection box 7 for connecting the solar cell circuits SC1, SC2,.
And a power conditioner 8 that converts DC power generated by the solar cell module 2 into AC power. The solar cell abnormality alarm device 6 includes a shunt resistor 9, a control circuit 10, a setting device 11, a display device 12, an alarm device 13, a power supply 14, and a test circuit 15 provided in parallel with the shunt resistor 9. Be composed. The control circuit 10 includes a unit time clock unit 16 for generating a pulse of the measurement unit time.
And the average output current values I1, I2,.
., A solar cell current measuring unit 17 for measuring In, an average output current calculating unit 18 for calculating an average output current of each solar cell circuit per unit time, and a maximum of the average output current of each solar cell circuit per unit time. An average current ratio calculation unit 19 that calculates the ratio of the average output current value of the other solar cell circuits to the reference value using the value as a reference value, and a current drop that detects a circuit whose average current ratio of each solar cell circuit is equal to or less than a set value. The circuit detecting unit 20 counts the number of continuous current reduction unit times of the current reduction circuit, and when the number exceeds a set value, sends a signal for causing the alarm device 13 to perform an alarm operation. And a continuous number counting section 21.

When an abnormality occurs in any one of the solar cell circuits and the output current decreases, the control circuit 10 detects the decrease and outputs an alarm signal to the alarm device 13 by displaying a sound signal, displaying an abnormal circuit, or operating a signaling contact. Cause an alarm action.

[0010]

As described above, the solar cell abnormality alarm device according to the present invention obtains an average output current value per unit time of each solar cell circuit in a solar power generation system using a plurality of solar cell circuits as power supplies. Comparing the average output current value of the solar cell circuit with the maximum average output current value with the average output current value of the other solar cell circuits, and determining that the average output current value of the specific solar cell circuit is the maximum average output current value. When the number of hours that falls below the set ratio exceeds the set time, a warning that the solar cell circuit is abnormal is issued, and the shadow of the building or cloud on part of the solar cell module Even when the sunlight of each solar cell module is not uniform due to, for example, being photographed or falling leaves, it is possible to avoid the possibility that an unnecessary alarm is issued by appropriately selecting the current decrease rate and the current decrease unit time. There is an effect that. In addition, when inspecting the solar cell module by a specialist, the operation can be simplified, and the schedule of the inspector is less affected by the weather and sunshine conditions.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of a solar power generation system incorporating a solar cell abnormality alarm device according to the present invention.

FIG. 2 is an explanatory diagram of one embodiment of a solar cell abnormality alarm device according to the present invention.

FIG. 3 is an explanatory diagram showing the operation of the solar cell abnormality alarm device according to the present invention.

FIG. 4 is an external view illustrating a solar cell abnormality alarm device according to the present invention.

FIG. 5 is an explanatory diagram of a conventional solar power generation system.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Photovoltaic power generation system 2 Solar cell module 6 Solar cell abnormality alarm device 7 Connection box 9 Shunt resistor 10 Control circuit 11 Setting device 12 Display device 13 Alarm device 14 Power supply 15 Test circuit

Claims (1)

[Claims] In a photovoltaic power generation system using a plurality of solar cell circuits as power supplies, an average output current value per unit time of each solar cell circuit is obtained, and the solar cell circuit having the maximum average output current value is connected to another solar cell circuit. Compared with the average output current value of the battery circuit, the number of hours during which the average output current value of the specific solar cell circuit falls below the percentage set for the solar cell circuit of the maximum average output current value is equal to or longer than the set time A warning indicating that the solar cell circuit is abnormal when the power supply becomes abnormal.