KR20180106112A - System for failure detection of photovoltaic module - Google Patents

Abstract

Disclosed is a fault detection system of a photovoltaic module. The fault detection system of a photovoltaic module according to the present invention comprises: at least one photovoltaic module for generating power by using a solar cell; at least one fault detection unit for sensing a voltage value, a current value, or a power value of a photovoltaic module, and determining whether a photovoltaic module malfunctions; and a fault diagnosis unit for dividing the photovoltaic module determined to malfunction by using a fault determination signal received from the fault detection unit, and transmitting identification information and location information of the photovoltaic module determined to malfunction to a manager. The at least one fault detection unit transmits a fault determination signal for a plurality of solar modules at different frequencies. Therefore, the present invention can determine the malfunction of the photovoltaic modules by minimum components. The fault determination signal may be transmitted to a more simplified communications line. Therefore, the communications structure of the fault detection system can be simplified.

Description

SYSTEM FOR FAILURE DETECTION OF PHOTOVOLTAIC MODULE

The present invention relates to a method and apparatus for detecting failure of a solar module, and more particularly, to a solar module capable of determining a failure of the solar module with a minimum number of components, To a fault detection system for a solar module capable of simplifying the communication structure of the fault detection system.

In general, photovoltaic power generation is a power generation system that converts solar energy into electric energy to produce electric power, and a large number of solar cells are used to produce electricity on a large scale using solar array modules.

Such a photovoltaic power generation system includes a plurality of photovoltaic modules in which photovoltaic cells for generating direct current by receiving sunlight are arrayed, a connection module for collecting the direct current generated in each photovoltaic module by unit strings, And a power conversion system (PCS: Power Conditioning System) for converting the total DC electricity collected in each connection module into AC electricity.

A plurality of photovoltaic modules (PV-array) of solar cells are connected to a connection module in a serial / parallel structure, and integrally transmit DC electricity to each connection string by a unit string.

Since many of these solar modules are arranged and maintained for a long time in a state exposed to the external environment, they are greatly affected by environmental changes. Therefore, the larger the number of PV modules, the more thorough the diagnosis and the maintenance and repair, the efficiency can be maintained.

Conventionally, a failure detection device for detecting vibration, shock, temperature, power parameters, etc. in real time has been separately configured for each solar module, and the failure of the solar module has been judged in real time.

However, in the conventional fault detection apparatus, in order to transmit fault related data detected for each solar module to a separate management server or control system, the transmission capacity is large, so that the communication system construction cost has to be additionally charged. Therefore, the efficiency of constructing the fault detection device has been reduced.

Particularly, in a power plant in which a large number of photovoltaic modules are installed in a large area, there is a problem that a cost for constructing a communication system is more than a cost for constructing a fault detection device. In addition, even when the communication system is complicatedly constructed, a plurality of communication system faults occur, and more time is required for the processing of the communication faults, so that the operation efficiency of the fault detecting apparatus is lowered.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and it is an object of the present invention to provide a fault diagnosis system and a fault diagnosis system which can determine a fault of a solar module with a minimum number of components, And to provide a fault detection system for a solar module capable of simplifying a communication structure.

According to an aspect of the present invention, there is provided a fault detection system for a solar module, including at least one solar module for generating power using the solar cell, a voltage value of at least one solar module, And at least one fault detection unit for detecting a fault or a power value to determine whether or not the solar module is faulty, and a fault judgment unit for discriminating a faulty solar module based on a fault judgment signal received from at least one fault detection unit, Wherein the at least one failure detection unit transmits the failure determination signal for the plurality of solar modules at different frequencies, and the failure diagnosis unit transmits identification information and position information of the solar modules to the manager, do.

The failure detection system of the present invention having various technical features as described above can be configured to determine the failure of the solar module with a minimum of components so as to reduce the installation cost of the failure detection system, Management and operation efficiency can be improved.

In addition, the fault detection system of the solar module of the present invention has the effect of simplifying the communication structure of the fault detection system by allowing the failure judgment signal of the solar module to be transmitted on a more simplified communication line.

FIG. 1 is a block diagram specifically showing a fault detection system for a solar module according to an embodiment of the present invention.
2 is a block diagram specifically showing the first failure detection unit shown in FIG.
FIG. 3 is a waveform diagram specifically showing a failure determination signal output waveform of the first communication unit shown in FIG. 2. FIG.
4 is a block diagram specifically showing the failure diagnosis unit shown in FIG.

The above and other objects, features, and advantages of the present invention will become more apparent by describing in detail exemplary embodiments thereof with reference to the attached drawings, which are not intended to limit the scope of the present invention. In the following description, well-known functions or constructions are not described in detail since they would obscure the invention in unnecessary detail. Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a block diagram specifically showing a fault detection system for a solar module according to an embodiment of the present invention.

1, the fault detection system of the present invention comprises at least one photovoltaic module (PV1 to PVn) for generating power using a solar cell, a voltage value of at least one photovoltaic module (PV1 to PVn), a current At least one fault detection unit (FD1 to FDn) for detecting a value or a power value and judging whether or not the solar module is faulty, and at least one fault detection unit And a failure diagnosis unit 100 for identifying the photovoltaic module and transmitting the identification information and the positional information of the failed photovoltaic module to the manager.

The fault diagnosis unit 100 detects the up / down change of the fault judgment signal and the fault judgment signal of the fault diagnosis unit 100, respectively, since at least one of the fault detection units FD1 to FDn transmits the fault judgment signal at different frequencies set in advance according to the identification information of the solar module The identification information and the location information of the photovoltaic module determined as a failure according to the frequency band of the photovoltaic module.

On the other hand, the fault detection system of the present invention includes a power inverting device (not shown) for collecting the generated power received from each of the plurality of solar modules PV1 to PVn, specifically, the power generation voltage or current and inverting the power to the DC / 200).

Each of the photovoltaic modules PV1 to PVn is configured such that a plurality of solar cells are arranged in a rectangular or curved frame, and generated power is generated using each of the solar cells. At this time, it is possible to generate a direct current or alternating voltage and generate a current through each of the solar cells. The generated direct current or AC voltage and current are collectively transmitted to the power inverter device 200 as generated power.

The solar cells of the PV modules PV1 to PVn are exposed to the external environment for a long time in order to receive the maximum amount of sunlight. Therefore, all the PV modules PV1 to PVn can not avoid the risk of frequent failures. Since the fault filter of such solar cells firstly affects the generated power, the voltage value, the current value or the power value of the generated power through the fault detectors FD1 to FDn corresponding to the respective PV modules PV1 to PVn It is possible to determine whether or not the failure has occurred.

When each of the failure detecting sections FD1 to FDn corresponds to each of the solar modules PV1 to PVn in a one-to-one correspondence, each of the failure detecting sections FD1 to FDn is incorporated in each of the solar modules PV1 to PVn, . For example, the first failure detection section FD1 is provided at the power generation output terminal of the first solar module PV1, and the second failure detection section FD2 is provided at the generation power output terminal of the second solar module PV2. Finally, the nth failure detection unit FDn is configured at the power generation output terminal of the nth solar module PVn.

These fault detectors FD1 to FDn compare the voltage value, the current value, or the power value respectively generated in the solar modules PV1 to PVn with preset reference values. Then, the fault diagnosis unit 100 determines whether or not a fault has occurred according to the comparison result, and sends a fault judgment signal indicating normal or fault to the fault diagnosis unit 100.

In particular, each of the fault detection units FD1 to FDn outputs a voltage value, a current value, or a power value of a voltage value, a current value, or a power value sensed from the corresponding solar modules PV1 to PVn provided therein, . If the sensed voltage value, current value, or power value is higher than a preset reference value, the failure diagnosis unit 100 transmits a failure determination signal that varies to a down level. On the other hand, each of the failure detection units FD1 to FDn outputs a failure determination signal that changes to an up level when the voltage value, the current value, or the power value is lower than a preset reference value. Therefore, when a failure determination signal that changes to the up level is output, the failure diagnosis server 100 can determine that the failure has occurred.

In the present invention, each of the fault detection units FD1 to FDn outputs a fault determination signal in accordance with identification information (for example, a module number or an identifier for each module) of the corresponding photovoltaic modules PV1 to PVn, And outputs a failure judgment signal. Specifically, the first failure detection unit FD1 that outputs a failure determination signal for the first solar module PV1 can output a failure determination signal that changes to an up / down level at a preset frequency of 120 Hz. The second fault detection unit FD2, which outputs a fault judgment signal for the second solar photovoltaic module PV2, can output a fault judgment signal that changes to the up / down level at a preset frequency of 110 Hz. Further, the third fault detecting section FD3, which outputs the fault judgment signal for the third solar photovoltaic module PV3, can output a fault judgment signal which varies to the up / down level in the frequency band of 100 Hz set in advance. Each of the fault detection units FD1 to FDn outputs a fault determination signal in different frequency bands set in advance according to the first to nth identification information of the solar modules PV1 to PVn.

The failure diagnosis unit 100 detects the frequency band of the failure determination signal input from each of the failure detection units FD1 to FDn to determine the identification information of each of the solar modules PV1 to PVn, It is possible to determine the failure of each of the solar modules PV1 to PVn according to whether it is down or up or down.

In other words, when a failure determination signal is input from each of the failure detection units FD1 to FDn, the failure diagnosis unit 100 detects the frequency bands of the input failure determination signals, Thereby distinguishing the optical modules PV1 to PVn. And finally determines the failure of each of the solar modules PV1 to PVn according to the up / down change of each failure judgment signal classified by the identification information. At this time, when each failure determination signal classified by the identification information is input as an up signal, the solar modules PV1 to PVn corresponding to the identification information can be finally determined as a failure.

Generally, when a failure occurs in any one of the solar modules PV1 to PVn, the generated power generated in the corresponding solar module is likely to be lower than the reference value. Accordingly, the fault detection unit of the present invention provided in the corresponding solar module supplies a fault judgment signal to the fault diagnosis unit 100 at an up level when the generated power becomes lower than the reference value. In addition, the failure diagnosis unit 100 can finally determine that the solar module, which receives the failure determination signal of the up level among the failure determination signals received from the first to nth failure detection units FD1 to FDn, respectively, as a failure.

On the other hand, the failure diagnosis unit 100 monitors the voltage value, the current value, or the power value supplied from the respective solar modules PV1 to PVn to the inverting unit 200 in real time, PVn) to provide statistical data on the amount of electricity generated. When a failure judgment signal indicating a failure is inputted from each of the failure detection units FD1 to FDn, it is judged whether or not the corresponding solar modules PV1 to PVn are faulty with reference to statistical data including the statistics of power generation amount and an average value And may predict aging and failure prognosis.

In addition, the failure diagnosis unit 100 can receive environment information including weather, climate, temperature, and magnitude through an Internet network and an external long distance network. In this case, when a failure determination signal is inputted from each of the failure detection units FD1 to FDn, it is possible to finally determine whether the failure has occurred by using environmental information including weather, climate, temperature, and magnitude.

As described above, the failure diagnosis unit 100 not only generates up / down failure determination signals input from the respective failure detection units FD1 to FDn, but also generates power generation amount statistics and an average value in addition to the up / down failure determination signals It is possible to accurately determine whether or not each PV module PV1 to PVn is faulty, with reference to all the environmental information including the statistical data including the weather, climate, temperature, progress, weather, and the like. Detailed configuration and technical features of the fault diagnosis unit 100 will be described in more detail with reference to the accompanying drawings.

In the case of the power inverting apparatus 200, the power generation power transmitted from each of the photovoltaic modules PV1 to PVn is collected and inverted to a DC / AC voltage level, and the inverted DC / AC voltage is converted into a power system Supply.

Specifically, the power inverting apparatus 200 converts the voltage and current generated from the first to nth solar modules PV1 to PVn into direct current or alternating current, (IGBT), which is a semiconductor device capable of high-speed switching of large power, is used as an isolation transformer for electrically isolating the power system of the power system, a capacitor for smoothing an AC voltage to a DC voltage, a filter inductor for reducing input / output current ripple, A bipolar transistor), a link capacitor for smoothing the input DC power, and the like.

2 is a block diagram specifically showing the first failure detection unit shown in FIG.

2, the first failure detection unit FD1 includes a detection unit F1 for sensing a voltage value, a current value, or a power value from the first solar cell module PV1, a voltage detection unit F1 for detecting the voltage value of the first solar cell module PV1 A comparison unit F2 for comparing the current value or the power value with a predetermined reference value to determine whether the voltage value, the current value, or the power value is equal to or greater than the reference value, and a comparison unit F2 for comparing the identification information of the first solar module PV1 And a control section (F4) for controlling the first communication section (F4) so as to output a failure determination signal for changing the voltage value, the current value, or the power value to the up or down level according to whether the power value is above or below the reference value F3).

Here, the first communication unit F4 generates a failure determination signal in a preset frequency band under the control of the control unit F3, and when the sensed voltage value, current value, or power value is higher or lower than the reference value, Or down-level to the failure diagnosis unit 100, and transmits the failure determination signal to the failure diagnosis unit 100. [ The first communication unit F4 may include a chirp communication module and may generate and transmit a failure determination signal using an up chirp or a down chirp signal.

Specifically, the detecting unit F1 senses a voltage value, a current value, or a power value from one of the photovoltaic modules PV1 corresponding to the photovoltaic module PV1, and the comparator F2 compares the sensed voltage value, current value, The current value, or the power value is greater than or equal to the reference value.

The control unit F3 controls the first communication unit F4 to output a failure determination signal in a frequency band set in accordance with the identification information of the solar module PV1. In this case, the voltage value, the current value, The first communication unit F4 is controlled so as to output a failure determination signal that varies to the up or down level depending on whether the received signal is a signal or not.

[Table 1]

FIG. 3 is a waveform diagram specifically showing a failure determination signal output waveform of the first communication unit shown in FIG. 2. FIG.

Referring to FIG. 3 and Table 1, the controller F3 outputs a failure determination signal in a preset frequency band according to the module numbers of the solar modules PV1 to PVn when outputting a failure determination signal. For example, as shown in Fig. 3, the first failure detecting section FD1 for outputting a failure judgment signal for the first solar module PV1 outputs a failure judgment signal for changing the up / down level at a preset frequency of 120 Hz Can be output.

The second fault detection unit FD2, which outputs a fault judgment signal for the second solar photovoltaic module PV2, can output a fault judgment signal that changes to the up / down level at a preset frequency of 110 Hz. Further, the third fault detecting section FD3, which outputs the fault judgment signal for the third solar photovoltaic module PV3, can output a fault judgment signal which varies to the up / down level in the frequency band of 100 Hz set in advance. Each of the fault detection units FD1 to FDn outputs a fault determination signal in different frequency bands set in advance according to the first to nth identification information of the solar modules PV1 to PVn.

On the other hand, each of the fault detection units FD1 to FDn is further provided with a power supply unit for supplying a power supply signal to the detection unit F1, the comparison unit F2, the control unit F3, and the first communication unit F4. In this way, each of the fault detectors FD1 to FDn is configured to simply determine that the received voltage value, current value, or power value is less than or equal to a preset reference value, and provide the determination result as a failure determination signal.

Therefore, the manufacturing cost of each of the failure detecting portions FD1 to FDn corresponding to each of the solar modules PV1 to PVn can be minimized, and it can be downsized and simply installed.

4 is a block diagram specifically showing the failure diagnosis unit shown in FIG.

4, the failure diagnosis unit 100 includes a second communication unit 110, a failure determination unit 120, an environment information reception unit 130, a database 140, a failure / aging prediction unit 150, And a statistical processing unit 110.

The second communication unit 110 receives a failure determination signal from each of the failure detection units PV1 to PVn. The second communication unit 110 includes a chirp communication module similar to the first communication unit F4 and can receive an up chirp or a down chirp signal.

The failure determination unit 120 detects the failure determination signal frequency band of each of the failure detection units PV1 to PVn received by the second communication unit 110. [ The identification information corresponding to the detected frequency band is respectively confirmed. At this time, the failure determining unit 120 also checks the failure according to the up / down change of the failure determination signal, and identifies the failure information of the photovoltaic module and the position information of the photovoltaic module corresponding to the identification information, .

The fault diagnosis unit (FD1 to FDn) transmits a fault determination signal at a preset frequency in accordance with the identification information of the solar module. Therefore, the fault diagnosis unit (100) It is possible to distinguish the identification information and the position information of the solar module determined as a failure. Here, as shown in Table 1 and FIG. 3, identification information corresponding to different frequency bands set in advance is stored in the database 140 in advance. Accordingly, the failure determining unit 130 can read the respective identification information corresponding to the detected frequency bands from the database 140. [

Further, when a failure judgment signal inputted from each of the failure detection units FD1 to FDn is inputted as an up-level signal, the failure judgment unit 130 judges the corresponding solar modules PV1 to PVn as a failure immediately . And when it is inputted with a down-level signal, it can be determined that the operation is normally performed. In this way, the failure detection unit provided in the failed solar module supplies a failure determination signal to the failure diagnosis unit 100 at the up level. In the failure determination unit 130, As a failure.

On the other hand, the failure judging unit 120 judges whether or not each of the photovoltaic modules PV1 to PVn is on the basis of the up / down failure judgment signal, the statistical data and the environmental information inputted from the respective fault detectors FD1 to FDn It is possible to make a final judgment as to whether or not the fault has occurred.

To this end, the statistical processing unit 160 monitors the voltage value and the current value supplied from the respective solar modules PV1 to PVn to the inverting unit 200 in real time, and outputs the voltage value and the current value of each solar module PV1 to PVn And generates statistical data including statistical values and average values of the voltage value and the current value.

Specifically, the statistical processing unit 160 monitors the voltage value and the current value supplied from the respective solar modules PV1 to PVn to the inverting apparatus 200 in real time. Then, statistical values and average values of the voltage value and the current value are calculated for each of the PV modules (PV1 to PVn). Next, statistical data of the generated power amount statistics and the average value calculated in units of a predetermined period are stored in the database 140. [

For example, the statistical processing unit 160 divides the voltage value and the current value supplied to the inverting apparatus 200 from each of the solar modules PV1 to PVn by time, month, year, and season, Can be calculated. In particular, the average generated voltage value and the current value are calculated by dividing the daytime and the nighttime in which the voltage value and the current value are high, and the average power generation amount in the time zone in which the generated voltage value and the current value are high is calculated for each month, It can be saved as statistical data.

Accordingly, when a failure determination signal indicating a failure is input from each of the plurality of failure detection units FD1 to FDn, the failure determination unit 120 compares the current voltage value and the current value with the time, the month, the year, The data can be compared and the fault can be finally judged.

Specifically, even if a failure determination signal of a down level is input from each of the plurality of failure detection units FD1 to FDn, the failure determination unit 120 does not determine that the failure is immediately detected. In this case, the current voltage value and the current value are compared with at least one statistical data among the statistical data calculated by time, month, year, and season, and it can be judged as a failure only when the voltage value and the current value are below the average value or the statistical value .

Specifically, the statistical data includes an average value of a voltage value, a current value, or a power value calculated for each hour, month, year, or season. The failure determining unit 130 receives from the failure detection units FD1 to FDn a failure determination signal of an up or down level and receives from the solar modules PV1 to PVn corresponding to the failure detection units FD1 to FDn A voltage value, a current value, or a power value is compared with the statistical data to finally determine whether each of the solar modules PV1 to PVn is faulty.

In fact, the voltage value and the current value can be varied depending on the degree of deterioration, the monthly season, and the seasonal climate of each solar module (PV1 to PVn). Accordingly, the failure determination unit 130 compares statistical data calculated by time period, month, year, and season without judging a failure only based on a failure determination signal input from each of the plurality of failure detection units FD1 to FDn and a reference value Analyze the failure. By re-confirming the fault using the statistical data, the accuracy can be further improved when the fault is detected.

On the other hand, the environment information receiving unit 130 receives environmental information including weather, climate, temperature, and degree of progress in each time zone through a separate Internet network or an external long distance communication network. Then, the input environment information is shared so that the failure determination unit 120 can confirm the input environment information.

As described above, since each of the solar modules PV1 to PVn is influenced by weather conditions such as monthly, seasonal climate, temperature, and weather, the voltage value and the current value can be changed according to the current environment information have.

Therefore, the failure determining unit 120 causes the reference values of the respective failure detecting units FD1 to FDn to be reset in accordance with the current weather conditions, that is, the environment information, and then the reference values reset by the failure detecting units FD1 to FDn, It is possible to generate a fault judgment signal according to the comparison result of the value and the current value. In this way, the failure determining unit 120 can compare the voltage value and the current value with the reference value updated in accordance with the environment information in each of the failure detecting units FD1 to FDn, thereby improving the accuracy of each weather condition .

Meanwhile, the data base 140 stores statistical data and environment information including voltage values, current value statistics, and average values of each of the failure detection units FD1 to FDn in real time and shares information with stored data.

The failure / aging prediction unit 150 compares statistical data and environmental information including voltage values, current value statistics, and average values received from the respective failure detection units FD1 to FDn, Predicts each aging and failure prognosis. The predicted aging and failure outcome can be provided as a separate control or management system.

Specifically, the failure / aging predicting unit 150 can monitor trends in the average generated power by comparing and analyzing monthly average, yearly and seasonal average voltage values and current values in real time. Therefore, in the failure / aging prediction unit 150, the average voltage value and the current value as compared with the average voltage value and the current value per month, year, and season are different from each other by a predetermined difference or more, It can be judged as failure or aging. If the failure prediction and the degree of deterioration are determined in advance, it is possible to efficiently manage each of the solar modules PV1 to PVn.

As described above, the failure detection system of the solar module according to the embodiment of the present invention is configured to determine the failure of the solar module with the minimum number of components, thereby reducing the installation cost of the failure detection system, The efficiency of management and operation of the module can be increased. In other words, the fault detection unit configured for each of the solar modules PV1 to PVn simply compares the voltage value and the current value with the reference value, judges whether the fault is caused by the comparison result, and outputs a fault judgment signal to the fault diagnosis unit 100. [ Lt; / RTI > Accordingly, the failure diagnosis unit 100 determines a failure for each of the solar modules PV1 to PVn. Accordingly, it is possible to minimize the installation cost and structure of each of the fault detection units FD1 to FDn, but to construct the communication line as simple as possible.

In addition, according to the present invention, the communication structure of the fault detection system can be simplified by allowing the failure determination signal of the solar module to be transmitted on a more simplified communication line. In addition, the failure diagnosis unit 100 uses the generated voltage value, current average value, statistical data, and environmental factors according to each weather module to determine the failure. Thus, the accuracy of fault detection can be improved. In addition, statistical data can be accumulated to predict the aging and failure prognosis for each solar module.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the following claims. It will be possible.

PV1 to PVn: First to nth solar battery modules
FD1 to FDn: First to n < th >
100:
110: second communication section
120:
130: environment information receiver
140: Database
150: Failure / aging prediction unit
160:

Claims (6)

At least one solar module for generating power using solar cells;
At least one failure detection unit for sensing a voltage value, a current value, or a power value of the at least one solar module and determining whether the solar module is faulty; And
And a failure diagnosing unit for identifying the solar modules determined to be malfunctioning using the malfunction determination signal received from the malfunction detecting unit and transmitting the identification information and the position information of the malfunctioning solar modules to the manager,
Wherein the at least one failure detection unit transmits the failure determination signal for the at least one solar module at different frequencies
Fault detection system for photovoltaic modules.
The method according to claim 1,
The at least one failure detection unit
A comparing unit comparing the voltage value, the current value, or the power value sensed from the solar module with a preset reference value to determine whether the voltage value, the current value, or the power value is greater than or less than the reference value; And
The fault determination signal which varies the up or down level depending on whether the voltage value, the current value, or the power value is greater than or less than the reference value, is set in accordance with the identification information of the solar module And a control unit for controlling the first communication unit to be transmitted
Fault detection system for photovoltaic modules.
3. The method of claim 2,
The first communication unit
The failure determination signal is generated at the different frequency according to the control of the control unit, and the failure determination signal is generated so as to vary the up / down level according to whether the voltage value, the current value, Generates a judgment signal and transmits it to the failure diagnosis section
Fault detection system for photovoltaic modules.
The method of claim 3,
The fault diagnosis unit
Wherein the identification information of each of the plurality of solar modules is detected by detecting a frequency band of the failure determination signal input from the at least one failure detection unit, To determine the failure of the photovoltaic module
Fault detection system for photovoltaic modules.
The method of claim 3,
The fault diagnosis unit
A second communication unit having the at least one chirp communication module and receiving the failure determination signal from the first communication unit; And
The frequency band of the failure determination signal received by the second communication unit is detected and the failure is checked according to the up / down change of the failure determination signal. If the failure is confirmed, the frequency band of the failure determination signal And a failure determination unit for outputting the corresponding identification information, respectively
Fault detection system for photovoltaic modules.
6. The method of claim 5,
Wherein each of the identification information corresponding to the different frequency bands is stored in advance in a database,
Wherein the failure judging unit reads the identification information corresponding to the frequency band of the detected failure judgment signal from the database
Fault detection system for photovoltaic modules.

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