JP6189550B1 - Solar panel inspection equipment - Google Patents

Abstract

Provided is a solar cell panel inspection apparatus capable of accurately and easily specifying a failure location of a solar cell panel even when the solar cell panel is not generating power. An inspection apparatus 100 for a solar cell panel that inspects a solar cell panel M in a non-energized state, and an AC wave input unit 10 that inputs an AC wave A whose frequency can be changed to the solar cell panel M to be inspected. And an inspection unit 20 that forms a capacitor 30 between the solar cell panel M and the electrode plate 21 with the electrode plate 21 in contact with or close to the surface of the solar cell panel M, and is connected to the capacitor 30. And the voltage output unit 50 that outputs the voltage at both ends of the inductor 40. The AC wave input unit 10 has a frequency between frequency bands including a resonance frequency at which the capacitor 30 and the inductor 40 resonate. A solar cell panel inspection apparatus for inputting the changed AC wave A to the solar cell panel M.

Description

  The present invention relates to a solar cell panel inspection apparatus and a solar cell panel inspection method.

  In recent years, solar power generation using sunlight, which has an inexhaustible energy source, has attracted attention due to the growing interest in clean energy that is environmentally friendly. In order to supply stable energy for a long time by photovoltaic power generation, it is necessary to arbitrarily or periodically inspect whether the solar cell panel used for power generation is defective.

  As an inspection device for a solar cell panel, the present inventors have so far scanned the surface of a solar cell panel in an energized state with a magnetic sensor and detected the magnetism generated from the circuit of the solar cell panel. Measure the impedance of the inspection device (see Patent Document 1) for judging disconnection or deterioration, or the junction box in which the wiring of the solar cell panel is aggregated, from the measured magnitude of the impedance The inspection apparatus (refer patent document 2) which determines the disconnection and deterioration of a solar cell panel has been developed.

  The inspection apparatus for solar cell panel of Patent Document 1 utilizes the phenomenon that the direction of magnetism generated from the bus bar changes greatly when the magnetic sensor crosses the position of the bus bar built in the solar cell panel. The disconnection or deterioration of the bus bar is determined from the amount. If the solar cell panel inspection apparatus of Patent Document 1 is used, the influence of natural geomagnetism on the inspection can be eliminated by taking the differential value of the change in magnetic vector before and after the bus bar. Inspection can be performed accurately at the panel installation site.

  The solar cell panel inspection apparatus disclosed in Patent Document 2 determines the presence or absence of defects in the solar cell panel before directly inspecting the surface of the solar cell panel. A solar panel circuit can be regarded as an equivalent circuit in which a resistor (R component), an inductor (L component), and a capacitor (C component) are connected in series, but a plurality of solar cells are connected to form a module. In such a solar cell panel, the influence of the inductor (L component) in the circuit is increased, so that the impedance of the entire solar cell panel is apparently increased, and it may be difficult to obtain an accurate inspection result. Therefore, in the solar cell panel inspection apparatus disclosed in Patent Document 2, the impedance of the solar cell panel is measured using an AC wave having such a frequency that the inductor (L component) and the capacitor (C component) resonate and cancel each other. ing. Thereby, since it can grasp | ascertain in advance whether the abnormal site | part is contained in the solar cell panel as a module, the test | inspection efficiency of a solar cell panel can be improved.

International Publication No. 2014/181388 International Publication No. 2015/087390

  By the way, among solar cell panel users, for example, there is a demand to perform an inspection even before the completion of power generation facilities using the solar cell panel or at night when the solar cell panel cannot generate power. In this regard, since the solar cell panel inspection apparatus of Patent Document 1 is a system that detects magnetism generated from the bus bar of the solar cell panel, a state in which current flows through the bus bar during inspection (more precisely, It is necessary to be in a state where current can flow. Therefore, the solar cell panel inspection apparatus of Patent Document 1 cannot perform an inspection in a state where the power system is not connected to the solar cell panel or in a state where light is not irradiated to the solar cell panel.

  Since the solar cell panel inspection apparatus of Patent Document 2 is a method for measuring the impedance of the solar cell panel, it is not essential that the solar cell panel being inspected is irradiated with light. However, as described above, the solar cell panel inspection apparatus of Patent Document 2 performs normality / abnormality determination of a solar cell panel as a module, and specifies up to a failure point of each panel constituting the module. It is not possible.

  As described above, in the solar cell panel inspection apparatuses of Patent Literature 1 and Patent Literature 2, it is possible to accurately identify the failure location of the solar cell panel before the completion of the power generation facility or at night when the solar cell panel cannot generate power. It is not possible, and the appearance of a new inspection device is desired. The present invention has been made in view of the above problems, and a solar cell capable of accurately and easily specifying a failure location of a solar cell panel even when the solar cell panel is not generating power. It aims at providing the inspection apparatus of a panel, and the inspection method of a solar cell panel.

The characteristic configuration of the inspection apparatus for solar cell panel according to the present invention for solving the above problems is as follows.
A solar panel inspection device for inspecting a non-energized solar panel,
An AC wave input unit that inputs an AC wave whose frequency can be changed for the solar cell panel to be inspected,
An inspection part that forms a capacitor between the solar cell panel and the electrode plate by bringing an electrode plate into contact with or close to the surface of the solar cell panel;
An inductor provided to connect to the capacitor;
A voltage output unit that outputs a voltage across the inductor;
With
The AC wave input unit has a constant rule or rhythm between frequency bands including a resonance frequency at which the capacitor and the inductor resonate so that a voltage across the inductor output from the voltage output unit pulsates. The AC wave whose frequency is changed according to the above is to be input to the solar cell panel.

  The solar cell panel inspection apparatus having this configuration includes an AC wave input unit that inputs an AC wave whose frequency can be changed, and a frequency band including a resonance frequency at which the capacitor and the inductor resonate from the AC wave input unit. The AC wave whose frequency is changed between the two is input to the solar cell panel to be inspected, and the voltage at both ends of the inductor is output from the voltage output unit. Here, the voltage across the inductor is proportional to the magnitude of the resonance energy of the inductor, and if the solar cell panel is normal, the AC wave energy is amplified and stored in the inductor. Therefore, by monitoring the voltage across the inductor, it is possible to accurately and easily determine whether the solar cell panel is normal or abnormal (including deterioration). Such an inspection can be performed by simply inputting an AC wave to the solar cell panel to be inspected even when the solar cell panel is in a non-energized state. Even at night when power generation is not possible, it is possible to accurately and easily identify the failure location of the solar cell panel.

  If it is the inspection apparatus of the solar cell panel of this configuration, since the frequency of the AC wave input from the AC wave input unit to the solar cell panel is changed according to a certain rule or rhythm, the solar cell panel is normal. If the frequency of the AC wave is changed within the frequency band and passes through the resonance frequency, the voltage across the inductor output from the voltage output unit pulsates according to a certain rule or rhythm, and the solar cell panel It becomes possible to recognize that it is normal more clearly.

In the solar cell panel inspection apparatus according to the present invention,
The frequency band is preferably 10 to 1000 kHz.

  If it is the inspection apparatus of the solar cell panel of this configuration, it is possible to cover the characteristics of almost all the solar cell panels on the market by setting the frequency band that can be taken by the frequency of the AC wave to 10 to 1000 kHz. It is possible to inspect solar panels of various scales from home use to industrial use.

In the solar cell panel inspection apparatus according to the present invention,
It is preferable to further include a determination unit that determines the state of the solar cell panel based on the voltage output to the voltage output unit.

  If it is a solar panel inspection device of this configuration, there is no need to analyze the measurement data after the fact and the state of the solar cell panel can be determined on the device side. It becomes possible.

In the solar cell panel inspection apparatus according to the present invention,
The determination unit determines that the solar cell panel is in a normal state when the maximum voltage is twice or more the minimum voltage for the voltage output to the voltage output unit, and the maximum voltage is equal to or less than the minimum voltage. When it is less than twice, it is preferable to determine that the solar cell panel is in a deteriorated state or an abnormal state.

  With the solar cell panel inspection apparatus of this configuration, the voltage across the inductor constantly fluctuates, so that a fault diagnosis of the solar cell panel can be performed simply by looking at the relationship between the maximum voltage and the minimum voltage. Specifically, when the maximum voltage is twice or more the minimum voltage, the solar cell panel is determined to be in a normal state, and when the maximum voltage is less than twice the minimum voltage, the solar cell panel is in a deteriorated state or It is determined that the state is abnormal. By making such a determination, a highly accurate inspection can be performed, and the long-term reliability of the solar cell panel can be improved.

In the solar cell panel inspection apparatus according to the present invention,
The solar cell panel is preferably a solar cell module in which a plurality of solar cells are connected.

  The solar cell panel inspection apparatus of this configuration selects a frequency band including a resonance frequency at which the inductor and the capacitor resonate as the frequency band of the AC wave input to the solar cell panel, In order to determine whether or not the solar panel is broken by using the stored resonance energy, it is possible to accurately and easily inspect without being affected by modularization (or stringing) of solar cells. Can do. Therefore, this invention can be utilized suitably in the test | inspection of the solar cell module by which a several photovoltaic cell is connected.

The characteristic configuration of the method for inspecting a solar cell panel according to the present invention for solving the above problems is as follows.
A method for inspecting a solar cell panel for inspecting a non-energized solar cell panel,
AC wave input process for inputting an AC wave whose frequency can be changed for the solar cell panel to be inspected,
An inspection step of contacting or approaching an electrode plate provided with an inductor on the surface of the solar cell panel;
Including
By the inspection step, a capacitor is formed between the solar cell panel and the electrode plate, and the inductor is connected to the capacitor.
A frequency changing step of changing the frequency of the AC wave according to a certain rule or rhythm between frequency bands including a resonance frequency at which the capacitor and the inductor resonate so that the voltage across the inductor pulsates ;
A voltage output step of outputting a voltage across the inductor;
It is to include.

  If it is the inspection method of the solar cell panel of this structure, there exists the same outstanding effect as the inspection apparatus of the solar cell panel mentioned above. That is, even if the solar cell panel is in a non-energized state, the AC wave energy is amplified and accumulated in the inductor if the solar cell panel is normal only by inputting the AC wave to the solar cell panel. By monitoring the voltage across the inductor, it is possible to determine whether the solar cell panel is normal or abnormal (including deterioration). Therefore, it is possible to accurately and easily identify the failure point of the solar cell panel even before the completion of the power generation facility or at night when the solar cell panel cannot generate power.

  If it is the inspection method of the solar cell panel of this structure, there exists the same outstanding effect as the inspection apparatus of the solar cell panel mentioned above. That is, if the solar cell panel is normal, the voltage at both ends of the inductor output from the voltage output unit follows a certain rule or rhythm every time the frequency of the AC wave is changed within the frequency band and passes through the resonance frequency. It pulsates and it becomes possible to recognize more clearly that the solar cell panel is normal.

FIG. 1 is an explanatory diagram relating to a solar cell panel. FIG. 2 is an explanatory diagram relating to the solar cell panel inspection apparatus of the present invention. FIG. 3 is an equivalent circuit diagram of the solar cell panel inspection apparatus of the present invention. FIG. 4 is a graph relating to an inspection result obtained by the solar cell panel inspection apparatus of the present invention. FIG. 5 is a flowchart of the solar cell panel inspection method of the present invention.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of a solar cell panel inspection apparatus and a solar cell panel inspection method of the present invention will be described with reference to the drawings. However, the present invention is not intended to be limited to the configurations described in the embodiments and drawings described below.

<Solar cell panel>
Before describing the solar cell panel inspection apparatus of the present invention, the principle of the solar cell panel to be inspected will be described. FIG. 1 is an explanatory diagram relating to the solar cell panel M. FIG. FIG. 1A is a schematic configuration diagram of a solar cell panel M. FIG. The solar battery panel M is configured as a solar battery module in which a plurality of solar battery cells S are connected in series, and a desired number of solar battery panels M are connected in series. FIG. 1A illustrates four solar cell panels M. Each of the solar cells S constituting each solar cell panel M is formed by joining an n-type semiconductor containing many negatively charged electrons and a p-type semiconductor containing many positively charged holes. When holes enter the n-type semiconductor, they combine with electrons. Similarly, when electrons enter the p-type semiconductor, they combine with holes. Thus, when the n-type semiconductor and the p-type semiconductor are joined, a region called a depletion layer having no electrons or holes is formed on the joint surface. An electric field is generated in the depletion layer. When sunlight enters the depletion layer, the light is absorbed by the semiconductor to generate electrons and holes, which are pushed out by the electric field and flow as current to the external circuit. This series of mechanisms is power generation. The current generated by the solar cell panel M is a direct current, and it is necessary to convert it into an alternating current in order to use it as electricity. As shown in FIG. 1A, each wiring of the solar cell panel M is concentrated in the connection box 1, and the connection box 1 is further connected to the power conditioner 2. The direct current generated by the solar cell panel M is converted into alternating current by the power conditioner 2 and used as power in factories, offices, residences, and the like.

  FIG. 1B is an equivalent circuit diagram of one solar battery cell S constituting the solar battery panel M. Although the configuration of the entire solar cell panel M is as described above, when considered in terms of an electric circuit diagram, one solar cell S constituting the solar cell panel M has a constant current as shown in FIG. It can be represented by a combination of a source (I component), a parallel diode (D component), a series resistance (Rs component), and a parallel resistance (Rsh component). Although the solar cell panel M has a module structure in which the solar cells S are connected in series, it can be considered that the equivalent circuit shown in FIG. 1B is connected in series by the number of the solar cells S. Therefore, the equivalent circuit diagram of the solar cell module can be represented as the equivalent circuit of FIG. 1B, as in the case of one solar cell S, although the values of the components such as the series resistance are changed.

<Inspection device for solar panel>
FIG. 2 is an explanatory diagram regarding the solar cell panel inspection apparatus 100 of the present invention. FIG. 3 is an equivalent circuit diagram of the solar cell panel inspection apparatus of the present invention. As shown in FIG. 2, the solar cell panel inspection apparatus 100 is configured as a set of a main body 70 and an AC wave input unit 10 that is separate from the main body 70. The solar cell panel M (solar cell S) to be inspected includes a cell 3 and a glass plate 4 that protects the cell 3 as shown in the cross-sectional view in FIG.

  As shown in FIG. 2, the AC wave input unit 10 is connected to the connection box 1 of the solar cell panel M to be inspected, and inputs an AC wave (AC voltage) A from the connection box 1 to the solar cell panel M. At this time, the solar cell panel M is in a non-energized state. The AC wave input unit 10 includes a wavelength adjustment unit 11, and the frequency of the AC wave A input to the solar cell panel M can be changed by the wavelength adjustment unit 11. The frequency of the AC wave A is changed between frequency bands including a resonance frequency at which the capacitor 30 formed by the solar cell panel M and a main body 70 described later and the inductor 40 provided in the main body 70 resonate. The frequency band is preferably 10 to 1000 kHz. In such a frequency band, the characteristics of almost all solar cell panels on the market can be covered, so that it is possible to inspect solar cell panels of various scales from general household use to industrial use.

The main body 70 includes an inspection unit 20, an inductor 40, and a voltage output unit 50. As illustrated in FIG. 3, the inspection unit 20 includes an electrode plate 21 and a sensor control board 22. When the electrode plate 21 of the inspection unit 20 is brought into contact with or close to the glass plate 4 on the surface of the solar cell panel M, a capacitor (C) 30 is formed between the solar cell panel M and the electrode plate 21. The capacity of the capacitor (C) 30 is represented by the following formula (1).
C = ε ₀ × ε × S / d (1)
C : Capacitance ε ₀ : Vacuum dielectric constant (8.85 × 10 ⁻¹² F / m)
ε : Relative permittivity of glass S : Electrode plate area d : Separation distance (= thickness of glass plate)
Assuming a general solar cell panel M, for example, the relative dielectric constant of the glass constituting the glass plate 4 is 4, the thickness of the glass plate 4 is 3.5 mm, and the electrode plate 21 brought into contact with or close to the glass plate 4 When the area is 121 cm ² (11 cm square), the capacitance of the capacitor (C) 30 is about 122 pF. Thus, the capacity of the capacitor (C) 30 is very small. In addition, the area of the electrode plate 21 can be changed according to the size of the solar battery cell S constituting the solar battery panel M to be inspected, and may be, for example, 25 to 225 cm ² (5 cm square to 15 cm square). it can.

  On the other hand, the solar cell panel M has an internal resistance (R) as shown in FIG. In addition, an inductor (L) 40 is connected to the inspection unit 20 via a sensor control board 22. Therefore, in a state where the electrode plate 21 of the inspection unit 20 is in contact with or close to the surface of the solar cell panel M, the resistance (R) on the solar cell panel M side and between the solar cell panel M and the electrode plate 21 are The capacitor (C) 30 and the inductor (L) 40 built in the main body 70 can be regarded as an equivalent circuit connected in series. When the AC wave A is input from the AC wave input unit 10 to this equivalent circuit, the inductor (L) 40 and the capacitor (C) 30 fluctuate according to the frequency of the AC wave A, and as a result, the overall appearance of the solar cell panel M appears. The upper impedance will fluctuate. Here, when the frequency at which the inductor (L) 40 and the capacitor (C) 30 resonate is selected as the frequency of the AC wave A, the inductor (L) 40 and the capacitor (C) 30 cancel each other, and the inductor ( L) 40 stores resonance energy. The present invention has been newly found out that a failure diagnosis of the solar cell panel M can be performed from an approach different from the conventional one by utilizing this resonance energy, and has been completed as an inspection device 100 for a solar cell panel.

  The resonance energy accumulated in the inductor (L) 40 has a correlation with the voltage across the inductor (L) 40. Accordingly, the solar cell panel inspection apparatus 100 of the present invention is configured to output the voltage across the inductor (L) 40 from the voltage output unit 50. The voltage across the inductor (L) 40 is proportional to the magnitude of the resonance energy of the inductor (L) 40. If the solar cell panel M is normal, the energy of the AC wave A (AC voltage) is amplified and the inductor (L) is stored in 40. The amplification factor of energy is determined by the relationship between the capacitance of the capacitor (C) 30 and the reactance of the inductor (L) 40, and is set to 2 times or more, preferably 5 times or more, more preferably 10 times or more. Therefore, the user can determine whether the solar cell panel M is normal or abnormal (including deterioration) by monitoring the voltage across the inductor (L) 40. Since such an inspection can be performed only by inputting the AC wave A to the solar cell panel M to be inspected even when the solar cell panel M is in a non-energized state, Even at night when the battery panel M cannot generate power, the failure location of the solar panel M can be accurately and easily specified.

  Incidentally, whether the solar panel M is normal or abnormal (including deterioration) can be determined by the user himself / herself based on the voltage across the inductor (L) 40. A determination unit 60 that determines the state of the solar battery panel M may be further provided in the main body 70 of the battery panel inspection apparatus 100. If the determination unit 60 is provided, it is not necessary to analyze the measurement data after the fact, and the state of the solar cell panel M can be determined on the device side, so that the failure diagnosis of the solar cell panel M can be performed on the spot. .

  The determination unit 60 can also be used as the voltage output unit 50. Since the voltage across the inductor (L) 40 constantly fluctuates, the failure diagnosis of the solar cell panel M can be performed only by looking at the relationship between the maximum voltage and the minimum voltage. As a determination criterion of the determination unit 60, for example, when the maximum voltage is twice or more the minimum voltage, it is determined that the solar cell panel M is in a normal state, and when the maximum voltage is less than twice the minimum voltage. The solar cell panel M is determined to be in a deteriorated state or an abnormal state. If such a determination is made, a highly accurate inspection can be performed, and the long-term reliability of the solar cell panel M can be improved.

  The determination unit 60 can also be configured by a plurality of LED lamps that are lit in stages according to the magnitude of the voltage output to the voltage output unit 50. In this case, when a certain number or more of LED lamps are turned on, it is determined that the solar cell panel M is normal because sufficient resonance energy is accumulated in the inductor (L) 40, and less than a certain number of LED lamps are present. When it is lit, it is determined that the solar cell panel M has deteriorated because sufficient resonance energy is not stored in the inductor (L) 40, and when the LED lamp is not lit at all, the inductor (L) 40 Since no resonance energy is accumulated in the solar cell panel M, it can be determined that the solar cell panel M is in failure (abnormal). Thus, if the determination part 60 is comprised with a some LED lamp, the failure diagnosis of a solar cell panel can be performed easily. Note that a buzzer (not shown) may be provided together with the determination unit 60 so that the determination result is notified by sound.

  As described above, the solar cell panel inspection apparatus 100 according to the present invention uses the resonance frequency at which the inductor (L) 40 and the capacitor (C) 30 resonate as the frequency band of the AC wave A input to the solar cell panel M. A band to be included is selected, and it is determined whether or not the solar cell panel M has failed using the resonance energy accumulated in the inductor (L) 40 when the inductor (L) 40 and the capacitor (C) 30 resonate. Therefore, the inspection can be performed accurately and easily without being affected by the modularization (or stringing) of the solar battery cell S. Therefore, this invention can be utilized suitably in the test | inspection of the solar cell panel M (solar cell module) by which the several photovoltaic cell S is connected.

<Inspection example of solar cell panel>
In the solar cell panel inspection apparatus 100 of the present invention, the frequency of the AC wave A input to the solar cell panel M to be inspected includes a frequency at which the capacitor (C) 30 and the inductor (L) 40 resonate. Changed between bands. The resonance frequency at which the capacitor (C) 30 and the inductor (L) 40 resonate can be adjusted by changing the inductor (L) 40. Therefore, in the solar cell panel inspection apparatus 100 of FIG. 2 provided with the AC wave input unit 10 and the main body 70 as a set, various types of inductors (L) 40 provided on the main body 70 side are prepared, and the same solar The battery panel was inspected. FIG. 4 is a graph relating to inspection results (inspection examples 1 to 3) by the solar cell panel inspection apparatus of the present invention.

[Inspection Example 1]
FIG. 4A is a chart showing the frequency dependence of the voltage generated at both ends of the inductor (L) when a reactance of 1 mH is used as the inductor (L) in the inspection of the solar cell panel. The voltage generated at both ends of the inductor (L) is the voltage output to the voltage output unit. In Inspection Example 1, the frequency of the AC wave input to the solar cell panel was changed between the frequency bands of 150 to 550 kHz. According to Test Example 1, a minimum voltage of about 3V was measured when the frequency of the AC wave was 150 kHz, and a maximum voltage of about 52V was measured when the frequency of the AC wave was 470 kHz. Thus, in Test Example 1, the maximum voltage generated at both ends of the inductor (L) was about 17 times the minimum voltage. If the maximum voltage is twice or more the minimum voltage, it can be determined that the solar cell panel is in a normal state, and thus this solar cell panel was confirmed to be in a normal state. According to the chart showing the frequency dependence of the voltage in FIG. 4A, the measured voltage value does not change greatly in the low frequency band after the inspection, but the voltage suddenly approaches the resonance frequency. After the voltage increases to a peak (maximum value) at the resonance frequency, it is possible to confirm a phenomenon in which the voltage rapidly decreases. Therefore, when changing the frequency of the AC wave between the frequency bands, for example, it is preferable to change from a low frequency to a high frequency according to a certain rule or rhythm. If such a method of changing the frequency is used, if the solar cell panel is normal, the voltage across the inductor (L) output from the voltage output unit is changed every time the frequency of the AC wave passes the resonance frequency. It pulsates according to a certain rule or rhythm, and as a result, it is possible to recognize more clearly that the solar cell panel is normal.

[Inspection Example 2]
FIG. 4B is a chart showing the frequency dependence of the voltage generated at both ends of the inductor (L) when the inductor (L) having a reactance of 2 mH is used in the inspection of the solar cell panel. The frequency band of the AC wave and the inspection procedure used in inspection example 2 are the same as in inspection example 1. According to Test Example 2, a minimum voltage of about 4 V was measured when the frequency of the AC wave was 150 kHz, and a maximum voltage of about 53 V was measured when the frequency of the AC wave was 330 kHz. Thus, in Test Example 2, the maximum voltage generated at both ends of the inductor (L) was about 13 times the minimum voltage. Therefore, it was confirmed that the solar cell panel is in a normal state. Also in the test example 2, when changing the frequency of the AC wave between the frequency bands, for example, if the frequency is changed from a low frequency to a high frequency according to a certain rule or rhythm, the voltage across the inductor (L) By this pulsation, it becomes possible to more clearly recognize that the solar cell panel is normal.

[Inspection Example 3]
FIG. 4 (c) is a chart showing the frequency dependence of the voltage generated at both ends of the inductor (L) when a reactance of 4.7 mH is used as the inductor (L) in the inspection of the solar cell panel. . The frequency band of the AC wave and the inspection procedure used in Inspection Example 3 are the same as in Inspection Example 1. According to Inspection Example 3, a minimum voltage of about 5V was measured when the frequency of the AC wave was 150 kHz, and a maximum voltage of about 54V was measured when the frequency of the AC wave was 211 kHz. Thus, in Test Example 3, the maximum voltage generated at both ends of the inductor (L) was about 11 times the minimum voltage. Therefore, it was confirmed that the solar cell panel is in a normal state. In the third inspection example, when changing the frequency of the AC wave between frequency bands, for example, if the frequency is changed from a low frequency to a high frequency according to a certain rule or rhythm, the voltage across the inductor (L) is changed. By this pulsation, it becomes possible to more clearly recognize that the solar cell panel is normal.

<Solar cell panel inspection method>
Next, the inspection method of the solar cell panel M of the present invention using the solar cell panel inspection device 100 will be described. FIG. 5 is a flowchart of a method for inspecting the solar battery panel M. The inspection method of the solar cell panel M is mainly implemented through each step of an AC wave input step, an inspection step, a frequency change step, and a voltage output step. In addition, in the following description and FIG. 5, each process of the inspection method of the solar cell panel M is shown by the symbol “S”.

[Inspection start (S0)]
In carrying out the inspection method of the solar cell panel M using the solar cell panel inspection device 100, the AC wave input unit 10 is connected to the connection box 1 of the solar cell panel M. Thereby, the test | inspection method of the solar cell panel of this invention is started.

[AC wave input process (S1)]
An AC wave A whose frequency can be changed is input from the AC wave input unit 10 to the non-energized solar cell panel M (S1).

[Inspection process (S2)]
The inspection is performed by bringing the inspection unit 20 of the main body 10 into contact with or close to the surface of the solar battery cell S constituting the solar battery panel M (S2). The inspection unit 20 is provided with an inductor (L) 40. If the solar cell S is normal, a capacitor (C) 30 is formed between the electrode plate 21 of the inspection unit 20 and the solar cell S. Thereby, the capacitor (C) 30 and the inductor (L) 40 are connected in series.

[Frequency changing step (S3)]
The frequency of the AC wave A is changed between frequency bands including a resonance frequency at which the capacitor (C) 30 and the inductor (L) 40 resonate (S3). The frequency band can be 10 to 1000 kHz. In changing the frequency of the AC wave A, it is preferable to change from a low frequency to a high frequency according to a certain rule or rhythm. When the frequency of the AC wave A approaches the resonance frequency, the resonance energy amplified in the inductor (L) 40 is accumulated.

[Voltage output step (S4)]
The voltage across the inductor (L) 40 is output to the voltage output unit 50. Based on the output voltage value, the user can determine whether or not the solar cell panel M is in a normal state. Specifically, the failure diagnosis of the solar cell panel M is performed from the relationship between the maximum voltage and the minimum voltage. For example, when the maximum voltage is twice or more the minimum voltage, the solar cell panel M is determined to be in a normal state, and when the maximum voltage is less than twice the minimum voltage, the solar cell panel M is in a deteriorated state or abnormal. It is determined that it is in a state.

[Continuation check (S5 to S7)]
When the above steps (S1 to S4) are completed, it is determined whether or not to inspect the next solar battery cell S (S5). When the next solar cell S is inspected (S5: YES), the inspection unit 20 of the main body 70 is moved to the position of the next solar cell S (S6), and steps 1 to 5 are repeated. When the next solar cell S is not inspected (S5: NO), the input of the AC wave A from the AC wave input unit 10 to the solar cell panel M is stopped, and the inspection is ended (S7).

  As described above, when the solar cell panel M is inspected using the solar cell panel inspection apparatus 100 according to the present invention, even if the solar cell panel M is in a non-energized state, the solar cell panel M is exchanged. If the solar panel M is normal only by inputting the wave A, the energy of the AC wave A is amplified and accumulated in the inductor (L) 40, so that the voltage at both ends of the inductor (L) 40 is output as a voltage. By monitoring by the unit 50, it is possible to accurately and easily determine whether the solar cell panel M is normal or abnormal (including deterioration). Therefore, the solar cell panel inspection apparatus 100 and the solar cell panel inspection method according to the present invention are suitable for the failure of the solar cell panel before the completion of the power generation facility using the solar cell panel or at night when the solar cell panel cannot generate power. This is a very useful technique for accurately identifying the location.

  The solar cell panel inspection apparatus and solar cell panel inspection method of the present invention are not limited to silicon-based solar cells that are currently mainstream, but various types of solar cell panels such as compound solar cells and organic solar cells. It can be used in the inspection.

DESCRIPTION OF SYMBOLS 1 Connection box 10 AC wave input part 11 Wavelength adjustment part 20 Inspection part 21 Electrode plate 22 Sensor control board 30 Capacitor (C)
40 Inductor (L)
DESCRIPTION OF SYMBOLS 50 Voltage output part 60 Judgment part 70 Main body 100 Solar panel inspection apparatus M Solar panel S Solar cell

Claims (6)

A solar panel inspection device for inspecting a non-energized solar panel,
An AC wave input unit that inputs an AC wave whose frequency can be changed for the solar cell panel to be inspected,
An inspection part that forms a capacitor between the solar cell panel and the electrode plate by bringing an electrode plate into contact with or close to the surface of the solar cell panel;
An inductor provided to connect to the capacitor;
A voltage output unit that outputs a voltage across the inductor;
With
The electrode plate has a shape of 5 cm square to 15 cm square,
The AC wave input section, before Symbol capacitor and the AC wave frequency between the frequency band including the resonance frequency inductor and resonates is changed, the inspection apparatus for the photovoltaic devices panel to be input to the solar panel . The solar cell panel inspection apparatus according to claim 1, wherein the AC wave input unit inputs an AC wave whose frequency is changed according to a certain rule or rhythm to the solar cell panel. The frequency band is 10 to 1000 kHz.
The solar cell panel inspection apparatus according to claim 1 or 2 . The inspection apparatus for a solar cell panel according to any one of claims 1 to 3, further comprising a determination unit that determines a state of the solar cell panel based on a voltage output to the voltage output unit. The determination unit determines that the solar cell panel is in a normal state when the maximum voltage is twice or more the minimum voltage for the voltage output to the voltage output unit, and the maximum voltage is equal to or less than the minimum voltage. The inspection apparatus for a solar cell panel according to claim 4 , wherein the solar cell panel is determined to be in a deteriorated state or an abnormal state when it is less than twice. The solar cell panel inspection apparatus according to any one of claims 1 to 5 , wherein the solar cell panel is a solar cell module in which a plurality of solar cells are connected.

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