KR20120065830A - Smart solar generation system - Google Patents

Abstract

PURPOSE: An intelligent solar power generating system is provided to rapidly detect defects of a solar cell string by installing a voltage detecting unit for detecting a ground fault and an electric leakage in the solar cell string. CONSTITUTION: A solar cell array unit(100) comprises a plurality of solar cell strings(110). Each solar cell string includes a plurality of solar cell modules(120) which are serially connected. A connection board(200) combines DC power from the solar cell strings and outputs the combined power to an inverter(300). The connection board includes a voltage detecting unit(240) which is individually connected to the solar cell string. The voltage detecting unit detects a voltage property of the solar cell string.

Description

Intelligent Solar Power Generation System {Smart Solar Generation System}

The present invention relates to a photovoltaic power generation system, and more particularly, to an intelligent photovoltaic power generation system having an intelligent management function capable of improving photovoltaic efficiency and safe maintenance and diagnosis of abnormalities in real time.

In general, photovoltaic power generation system is actively being researched and developed in advanced countries as a solution to global environmental problems and diversification of future energy sources due to the pollution-free and indefiniteness of solar energy.

 Such a photovoltaic power generation system is a stand-alone power generation system that stores generated power in a storage battery and supplies power at a necessary time according to a method of using generated power, and a grid-connected type that supplies generated power to a load and supplies surplus power to the grid. It is divided into power generation system.

In recent years, the spread of grid-connected power generation systems has been spreading due to the minimization of grid impact of distributed power supplies, system protection technology for accidents, and improvement of inverter control technology.

The grid-connected power generation system includes a solar cell array unit including a plurality of solar cell strings in which a plurality of solar cell modules are connected in series, a connection panel for merging and outputting DC powers output from the solar cell strings, and the connection panel. It includes an inverter that converts the output DC power into AC power to supply to the load or commercial system.

At this time, the connection panel is provided with a fuse, a non-return diode, a current transformer, etc. to improve the distribution efficiency and the safety function.

On the other hand, in recent years, as the supply of photovoltaic power generation systems soared, the introduction of a remote management system for measuring and monitoring the operating state of the entire photovoltaic power generation system from a remote place is active.

However, since the conventional monitoring method of the photovoltaic power generation system is a method of monitoring the total power generation voltage and current of the solar cell array unit or monitoring the power generation voltage and current of each solar cell string, each of the solar cell modules in the solar cell string It was not possible to determine the detailed abnormalities and abnormal parts, such as ground fault and short circuit, and, accordingly, a problem that takes a lot of time and cost to maintain the solar cell array unit. In addition, when an abnormality occurs on the line installed in the connection panel for connecting the solar cell array unit and the inverter, a considerable amount of effort and time are spent in identifying and repairing a failure site, thereby degrading power generation efficiency. Is occurring.

Accordingly, the present invention has been made in view of the above problems, and the present invention accurately and quickly detects abnormalities and abnormal parts of components constituting the photovoltaic power generation system, thereby improving maintenance efficiency and power generation efficiency. It provides intelligent solar power generation system with intelligent management function.

An intelligent photovoltaic power generation system according to an aspect of the present invention converts a direct current power output from the solar cell array unit and the solar cell array unit including a plurality of solar cell strings in which a plurality of solar cell modules are connected in series to AC power. It is installed between the inverter to combine the DC power output from the solar cell strings and outputs to the inverter. The connection panel may include a fuse connected in series to each output terminal of each of the solar cell strings, a non-return diode connected in series to the fuse, a current transformer connected in series to the non-return diode, and individually connected to each of the solar cell strings. A voltage detector for detecting an intermediate voltage characteristic of at least one module group of the module groups by dividing the total voltage characteristic of the string and the solar cell modules constituting the solar cell string into two or more module groups; Comparative analysis of the total voltage characteristics and the intermediate voltage characteristics detected by the voltage detector to detect the abnormality and abnormal parts of the solar cell string, and transmits the detection signal detected by the abnormality detector to an external central monitoring unit It includes a communication unit for.

The voltage detector may include a first voltage measurer configured to measure a voltage between a positive output terminal and a negative output terminal of the solar cell string, an intermediate terminal between the module groups included in the solar cell string, and a negative output terminal of the solar cell string. A second voltage measuring unit for measuring a voltage, and a third voltage measuring unit for measuring the voltage between the intermediate terminal between the module group included in the solar cell string and the positive output terminal of the solar cell string.

The fuse may be formed as a pull-out fuse to prevent electric shock.

The connection panel may further include a surge protector connected to an output terminal of each of the solar cell strings to protect the connection panel from lightning and overvoltage. In addition, the connection panel may further include an alarm unit for notifying of an abnormality and an abnormality detected by the abnormality detecting unit.

Photovoltaic power generation system according to an aspect of the present invention includes a solar cell array unit, a connection panel, an inverter and a central monitoring unit. The solar cell array unit includes a plurality of solar cell strings in which a plurality of solar cell modules are connected in series. The connection panel includes series circuit parts including a fuse connected in series to each output terminal of each of the solar cell strings, a backflow prevention diode connected in series to the fuse, and a current transformer connected in series to the backflow prevention diode, and the series circuit parts in parallel. It includes a circuit breaker connected to the output terminal connected, and outputs the combined DC power output from the solar cell strings. The inverter converts DC power output from the connection board into AC power.

To print. The central monitoring unit monitors the operation status and abnormality of the solar cell array unit, the connection panel and the inverter. The connection panel may include: a first voltage measuring unit measuring a voltage across the fuse to detect an abnormality of the fuse, and a voltage measuring both ends of the reverse flow prevention diode to detect an abnormality of the backflow prevention diode. 2 a voltage measuring unit, a third voltage measuring unit for measuring the voltage across the breaker to detect the abnormality of the circuit breaker, from the first voltage measuring unit, the second voltage measuring unit and the third voltage measuring unit And an abnormality detector for detecting an abnormality of the fuse, the non-return diode and the circuit breaker by analyzing the measured voltage, and a communication unit for transmitting the detection signal detected by the abnormality detector to the central monitoring unit.

The connection panel may further include an alarm unit for notifying whether there is an abnormality detected by the abnormality detecting unit.

The connection panel is individually connected to each of the solar cell strings, and the module groups are divided into two or more module groups by dividing the solar cell modules constituting the solar cell strings and the overall voltage characteristics of the solar cell strings. The apparatus may further include a voltage detector configured to detect an intermediate voltage characteristic of at least one module group. At this time, the

The abnormality detector may detect whether the solar cell string is abnormal and an abnormal part by comparing and analyzing the total voltage characteristic and the intermediate voltage characteristic detected by the voltage detector.

According to such an intelligent photovoltaic power generation system, by installing a voltage detector for detecting an abnormality such as a ground fault and a short circuit for each of the solar cell strings in the connection panel, not only the overall abnormality of the solar cell strings is detected, It is possible to accurately detect the partial abnormality and the abnormal site for the solar cell modules constituting the solar cell string. Therefore, when a fault such as a ground fault or a short circuit occurs in the solar cell string, the inspection time can be shortened since the inspection and replacement can be performed in the module group of the solar cell string without the need for the entire inspection and replacement of the solar cell string. The cost of replacement can be greatly reduced.

In addition, by separately installing a surge protector at the output terminal of each solar cell string in the junction, and using a pull-out fuse, it is possible to prevent damage to the main components in the junction from lightning or overvoltage, Electric shock can be prevented when checking and replacing the fuse.

In addition, by adding a function that can detect the presence or absence of individual abnormalities for components such as fuses, backflow prevention diodes, and circuit breakers installed inside the connection panel, it is easy to accurately diagnose and repair the connection panel.

In addition, by monitoring the occurrence of abnormalities and abnormalities detected in the connection panel in real time through the central monitoring unit, it is possible to quickly and accurately check the failure portion of the entire photovoltaic system, and to quickly Measures can be taken to improve overall power generation efficiency and convenience for solar power systems.

1 is a block diagram of an intelligent photovoltaic power generation system according to an embodiment of the present invention.
FIG. 2 is a schematic configuration diagram of the voltage detector shown in FIG. 1.
3 is a block diagram of an intelligent photovoltaic power generation system according to another embodiment of the present invention.

The above-described features and effects of the present invention will become more apparent from the following detailed description taken in conjunction with the accompanying drawings, and thus, those skilled in the art to which the present invention pertains may easily implement the technical idea of the present invention. There will be. As the inventive concept allows for various changes and numerous embodiments, particular embodiments will be illustrated in the drawings and described in detail in the text. It should be understood, however, that the invention is not intended to be limited to the particular forms disclosed, but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. In the present application, the term "comprise" or "having" is intended to indicate that there is a feature, number, step, operation, component, part, or combination thereof described in the specification, and that one or more other features It is to be understood that the present invention does not exclude the possibility of adding or presenting numbers, steps, operations, components, parts, or combinations thereof. The terms first, second, etc. may be used to describe various components, but the components should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, the first component may be referred to as the second component, and similarly, the second component may also be referred to as the first component.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Reference will now be made in detail to the preferred embodiments of the present invention, examples of which are illustrated in the accompanying drawings.

1 is a block diagram of an intelligent photovoltaic power generation system according to an embodiment of the present invention, Figure 2 is a schematic block diagram of a voltage detector shown in FIG.

1 and 2, an intelligent photovoltaic power generation system according to an embodiment of the present invention includes a solar cell array unit 100, a connection panel 200, an inverter 300, and a central monitoring unit 400. do.

The solar cell array unit 100 includes a plurality of solar cell strings 110, and each solar cell string 110 includes a plurality of solar cell modules 120 connected in series. The solar cell module 120 has a configuration in which solar cells, which are the minimum units of the solar cell, are connected in series, and output DC power of about 20 to 60V, for example. The solar cell string 110 includes a plurality of solar cell modules 120 connected in series with each other to boost the output voltage to the input voltage required by the inverter 300. For example, the solar cell string 110 is composed of about 8 to about 10 solar cell modules 120, and outputs a DC power having a voltage of about 200 ~ 700V.

The connection panel 200 is installed between the solar cell array unit 100 and the inverter 300 to merge DC power output from the solar cell strings 110 and output the combined power to the inverter 300.

The connection panel 200 is a fuse 210 connected in series to each output terminal of each of the solar cell strings 110 to individually protect the solar cell strings 110, and a reverse flow current connected in series to the fuses 210 to prevent backflow. It includes a series circuit portion consisting of the current protection circuit 230 connected in series with the anti-reflective diode 220 in order to detect the protection diode 220 and the overcurrent and fault current of the line. The connection order of the fuse 210, the non-return diode 220, and the current transformer 230 connected in series to the output terminal of each of the solar cell strings 110 may be changed as necessary. In addition, the connection panel 200 includes a circuit breaker 280 connected to the output terminal connected in parallel with the series circuit.

The connection panel 200 includes a voltage detector 240 individually connected to each of the solar cell strings 110 in order to detect abnormalities and abnormal parts such as individual ground faults and short circuits of the solar cell strings 110. In addition, the connection panel 200 detects the abnormality of the individual solar cell string 110 and the abnormal site by analyzing the voltage characteristics detected by the voltage detector 240 and the abnormality detector 250 and the abnormality detector 250. And a communication unit 260 for transmitting the detected signal to an external central monitoring unit 400.

The voltage detector 240 detects overall voltage characteristics of the individual solar cell strings 110. In addition, the voltage detector 240 divides the solar cell modules 120 constituting the solar cell string 110 into two or more module groups 110a and 110b, and includes at least one of the module groups 110a and 110b. The intermediate voltage characteristic for one module group is detected. For example, the solar cell string 110 may include a first module group 110a and a second module group 110b in which the solar cell modules 120 are divided into two parts. That is, when the solar cell string 110 includes eight solar cell modules 120, the first solar cell module S1 to the fourth solar cell module S4 may be formed. The first module group 110a may be divided, and the fifth solar cell module S5 to the eighth solar cell module S8 may be divided into a second module group 110b. Alternatively, the solar cell string 110 may be divided into three or more module groups as needed.

The voltage detector 240 detects the overall voltage characteristics and the intermediate voltage characteristics of the solar cell string 110, and includes a first voltage measurer 242, a second voltage measurer 244, and a third voltage measurer 246. ). The first voltage measuring unit 242 measures a voltage between the positive output terminal V + 1 and the negative output terminal V− of the solar cell string 110. That is, the voltage detector 240

The entire voltage characteristic of the solar cell string 110 is detected through the first voltage measuring unit 242. The second voltage measuring unit 244 is disposed between the intermediate terminal V + 2 between the module groups 110a and 110b included in the solar cell string 110 and the negative output terminal V− of the solar cell string 110. Measure the voltage of That is, the second voltage measuring unit 244 measures the voltage between the intermediate terminal V + 2 and the negative output terminal V− corresponding to the first module group 110a and the second module group 110b. The intermediate voltage characteristic across the one module group 110a is detected. The third voltage measuring unit 246 includes the intermediate terminal V + 2 between the module groups 110a and 110b included in the solar cell string 110 and the positive output terminal V + 1 of the solar cell string 110. Measure the voltage between. That is, the third voltage measuring unit 246 measures the voltage between the intermediate terminal V + 2 and the positive output terminal V + 1 corresponding to the first module group 110a and the second module group 110b. The intermediate voltage characteristic across the second module group 110b is detected. The first voltage measurer 242, the second voltage measurer 244, and the third voltage measurer 246 transmit the detected total voltage characteristic and the intermediate voltage characteristic to the abnormality detector 250.

The abnormality detection unit 250 compares and analyzes the overall voltage characteristics and the intermediate voltage characteristics of the solar cell string 110 transmitted from the voltage detection unit 240 to determine whether or not an abnormality such as a ground fault or a short circuit of the individual solar cell string 110 is present. Detect.

For example, the abnormality detector 250 may include a voltage difference between the both ends V + 1 and V− of the entire output of the solar cell string 110 measured by the first voltage measurer 242, and the second voltage measurer 244. Voltage difference between the both ends (V + 2, V-) of the first module group 110a measured in the step S, and both ends (V + 2) of the second module group 110b measured by the third voltage measuring unit 246. , Comparing and comparing the voltage difference between the V + 1) to detect the overall abnormality of the solar cell string 110, as well as partial abnormality of the module groups (110a, 110b) constituting the solar cell string (110). Whether or not and abnormal site can be accurately detected. For example, the abnormal voltage of the entire solar cell string 110 is detected by the first voltage measuring unit 242 and the abnormal voltage of the first module group 110a by the second voltage measuring unit 244. When the detection is detected, the abnormality detection unit 250 determines that an abnormality such as a ground fault or a short circuit occurs in the first module group 110a of the solar cell string 110. On the other hand, when the abnormal voltage of the entire solar cell string 110 is detected by the first voltage measuring unit 242 and the abnormal voltage of the second module group 110b is detected by the third voltage detecting unit 246. The abnormality detection unit 250 determines that an abnormality such as a ground fault or a short circuit occurs in the second module group 110b of the solar cell string 110. In the present embodiment, the solar cell string 110 is divided into two module groups 110a and 110b to detect an abnormality. Alternatively, the abnormality is detected by dividing the solar cell string 110 into three or more module groups and detecting the abnormality. More detailed detection of may be possible.

The abnormality detector 250 detects individual abnormalities and abnormalities of the solar cell string 110 through the voltage value measured by the voltage detector 240, and then transmits the detected result to the communication unit 260.

The communication unit 260 converts the detection results of individual abnormalities and abnormal areas of the solar cell strings 110 into a signal suitable for data transmission and transmits them to a central monitoring unit 400 installed at a remote location through wired or wireless communication. do. On the other hand, the communication unit 260 may transmit a detection signal for the overcurrent and the accident current of the line transmitted from the current transformer 230 to the central monitoring unit 400.

On the other hand, the connection panel 200 may further include an alarm unit 270 for notifying each of the individual abnormalities and abnormalities of the solar cell strings 110 detected by the abnormality detection unit 250 by itself. The alarm unit 270 may include a buzzer or a lamp for notifying occurrence of an abnormality, and may even display a portion where an abnormality occurs through the LED lamp.

The inverter 300 converts the DC power output from the solar cell strings 110 into the AC power by combining the DC power output from the connection panel 200. AC power generated by the inverter 300 is supplied to the system 500 or the load 600.

The central monitoring unit 400 monitors the operation status and abnormality of the solar cell array unit 100, the connection panel 200, and the inverter 300. That is, the central monitoring unit 400 synthesizes the signals transmitted from the communication unit 260 installed in the connection panel 200 and the signals transmitted from the inverter 300 for comprehensive operation and accident diagnosis of the entire photovoltaic system. It performs functions such as monitoring and alarm. To this end, the central monitoring unit 400 includes a central server for processing and storing signals transmitted from the communication unit 260 and the inverter 300, and a display unit such as a monitor or a display board for displaying a monitoring state. Therefore, the operator of the photovoltaic power generation system can remotely monitor the entire photovoltaic power generation system through monitoring through the central monitoring unit 400, and quickly recognize the abnormality and the abnormality part to time and cost of maintenance. Can be saved.

On the other hand, since the solar cell array unit 100 and the connection panel 200 is installed on a wide flat outside, it is easy to be exposed to risk factors such as lightning. Accordingly, the connection panel 200 may further include a surge protector 290 for protecting major components such as the connection panel 200 from lightning and overvoltage. The surge protector 290 is installed at the front end of the series circuit including the output end of each of the solar cell strings 110, that is, the fuse 210, the non-return diode 220, and the current transformer 230. In addition, the surge protector 290 may be installed between the parallel connection unit and the circuit breaker 280 to which the series circuit units are connected in parallel. As such, by installing surge protectors 290 at both ends of the series circuit portion including the fuse 210, the non-return diode 220, the current transformer 230, and the like, the damage of the components constituting the series circuit portion can be prevented as much as possible. Can be.

In addition, since there is a risk of electric shock when the fuse 210 is inspected and replaced, the fuse 210 is formed of an electric shock prevention fuse, for example, a pull-out fuse.

In this way, by additionally installing a surge protector 290 in the junction panel 200 and using a pull-out fuse, it is possible to prevent damage or electric shock of major components in the junction panel from lightning or overvoltage. have.

3 is a block diagram of a solar power system according to another embodiment of the present invention. In FIG. 3, since the rest of the configuration except for the connection board has the same configuration as that shown in FIG. 1, the same reference numerals are used for the same configuration, and detailed description thereof will be omitted.

Referring to FIG. 3, the solar power generation system according to another embodiment of the present invention includes a solar cell array unit 100, a connection panel 200, an inverter 300, and a central monitoring unit 400.

In this embodiment, by adding a function that can determine whether there is an abnormality individually for the main components installed in the connection panel 200, it is possible to increase the efficiency of maintenance for the connection panel 200. To this end, the connection panel 200 detects the abnormality of the first voltage measuring units 212 and the non-return diode 220 to measure the voltage across the fuse 210 to detect the abnormality of the fuse 210. The second voltage measuring units 222 measuring the voltage across the non-return diode 220 to detect and the third voltage measurement measuring the voltage across the circuit breaker 280 to detect the abnormality of the breaker 280. It may include a portion 282. The measured voltages measured by the first voltage measurers 212, the second voltage measurers 222, and the third voltage measurer 282 are transmitted to the abnormality detector 250.

The abnormality detector 250 analyzes the measured voltages measured by the first voltage measuring units 212, the second voltage measuring units 222, and the third voltage measuring unit 282 to prevent fuses 210 and backflow. Detects abnormality of the diodes 220 and the circuit breaker 280. The abnormality detector 250 detects the presence or absence of individual abnormalities of the fuses 210, the non-return diodes 220, and the circuit breaker 280, and then transmits the detected result to the communication unit 260.

The communication unit 260 converts the detection result of the individual abnormality of the fuse 210, the non-return diode 220, the breaker 280, etc. into a signal suitable for data transmission, and centrally monitors remotely installed through wired or wireless communication. The unit 400 transmits.

On the other hand, the abnormality detection unit 250 may transmit a detection result for the presence or absence of individual abnormalities for the fuse 210, the backflow prevention diode 220 and the circuit breaker 280 to the alarm unit 270, the alarm unit 270 is Based on the transmitted detection result, the presence or absence of an abnormality and information on the abnormal parts of the main parts installed in the connection panel 200 may be displayed by itself through a buzzer or a lamp.

As described above, the central monitoring unit 400 remotely monitors the abnormality of components such as the fuse 210, the non-return diode 220, and the circuit breaker 280 installed in the connection panel 200 in real time, thereby providing a detailed circuit. And it is possible to comprehensively check the failure parts of each part, thereby improving the efficiency of maintenance of the solar power system.

On the other hand, although not shown, by additionally installing the voltage detector 240 as shown in Figs. 1 and 2 in the connection panel 200, not only the abnormal detection of the connection panel 200, but also the solar cell array unit ( Anomaly detection function 100 may also be performed at the same time.

As described above, the overall abnormality for the solar cell string 110 is provided by providing a voltage detector 240 for detecting an abnormality such as a ground fault and a short circuit for each of the solar cell strings 110 in the connection panel 200. In addition to detecting whether or not, it is possible to accurately detect the partial abnormality and the abnormal site for the solar cell modules 120 constituting the solar cell string 110. Therefore, when a fault such as a ground fault or a short circuit occurs in the solar cell string 110, the module groups 110a and 110b in the solar cell string 110 do not need to be inspected and replaced by the solar cell string 110. Inspection and replacement can be done on a unit basis, reducing inspection time and significantly reducing replacement costs.

In addition, by additionally installing a surge protector 290 separately at each output terminal of the solar cell string 110 in the connection panel 200 and using a pull-out fuse, the connection panel from lightning or overvoltage It is possible to prevent damage to the main components in the inside, and to prevent an electric shock accident during the inspection and replacement of the fuse (210).

In addition, by adding a function that can detect the presence or absence of individual abnormalities for the components such as the fuse 210, the backflow prevention diode 220 and the circuit breaker 280 installed inside the connection panel 200, to the connection panel 200 Easy fault diagnosis and repair

In addition, by monitoring the occurrence of the abnormality and the detection result for the abnormal site detected in the connection panel 200 in real time through the central monitoring unit 400, it is possible to quickly and accurately check the failure portion of the entire photovoltaic power generation system, maintenance Prompt action on maintenance and aftercare is possible, improving the overall operational efficiency and convenience of the PV system.

In the detailed description of the present invention described above with reference to the preferred embodiments of the present invention, those skilled in the art or those skilled in the art having ordinary skill in the art will be described in the claims to be described later It will be understood that various modifications and variations can be made in the present invention without departing from the scope of the present invention.

100: solar cell array unit 110: solar cell string
120: solar cell module 200: connection panel
210: fuse 220: backflow prevention diode
230: current transformer 240: voltage detector
250: abnormality detection unit 260: communication unit
270: alarm unit 280: breaker
300: inverter 400: central monitoring unit

Claims (6)

A plurality of solar cell modules are installed between the solar cell array unit including a plurality of solar cell strings connected in series and an inverter for converting DC power output from the solar cell array unit into AC power and output from the solar cell strings In the connection panel for a photovoltaic power generation system for merging the DC power to be output to the inverter,
A fuse connected in series to an output terminal of each of the solar cell strings;
A backflow prevention diode connected in series with the fuse;
A current transformer connected in series with the non-return diode;
At least one of the module groups may be separately connected to each of the solar cell strings, and may be divided into two or more module groups for the overall voltage characteristics of the solar cell strings and the solar cell modules constituting the solar cell strings. A voltage detector detecting an intermediate voltage characteristic of the module group;
An abnormality detector configured to compare and analyze the total voltage characteristic and the intermediate voltage characteristic detected by the voltage detector to detect whether the solar cell string is abnormal or not; And
It includes a communication unit for transmitting the detection signal detected by the abnormality detection unit to the external central monitoring unit,
The voltage detector
A first voltage measuring unit measuring a voltage between a positive output terminal and a negative output terminal of the solar cell string;
A second voltage measuring unit measuring a voltage between an intermediate terminal between the module groups included in the solar cell string and a negative output terminal of the solar cell string; And
And a third voltage measuring unit measuring a voltage between an intermediate end between the module groups included in the solar cell string and a positive output end of the solar cell string. The method of claim 1,
The fuse is an intelligent photovoltaic power generation system, characterized in that formed of a pull-out (pull-out) fuse for preventing electric shock. The method of claim 1,
And a surge protector connected to an output end of each of the solar cell strings to protect the connection panel from lightning and overvoltage. The method of claim 1,
Intelligent photovoltaic power generation system characterized in that it further comprises an alarm unit for informing the presence or absence of abnormality detected by the abnormality detection unit. A solar cell array unit including a plurality of solar cell strings in which a plurality of solar cell modules are connected in series;
Series circuit portions including a fuse connected in series to each of the solar cell strings, a non-return diode connected in series to the fuse, and a current transformer connected in series to the non-return diode, and connected to an output terminal connected in parallel A connection panel including a circuit breaker and combining and outputting DC powers output from the solar cell strings;
An inverter for converting DC power output from the connection board into AC power; And
It includes a central monitoring unit for monitoring the operation state and abnormality of the solar cell array unit, the connection panel and the inverter,
The connecting panel,
A first voltage measuring unit measuring a voltage across the fuse to detect an abnormality of the fuse;
A second voltage measuring unit measuring a voltage across both ends of the non-return diode in order to detect an abnormality of the non-return diode;
A third voltage measuring unit measuring a voltage across both ends of the breaker to detect an abnormality of the breaker;
A fourth voltage measurer configured to measure a voltage between the positive output terminal and the negative output terminal of the solar cell string, and divide the solar cell modules included in the solar cell string into two or more module groups to form an intermediate portion between the module groups. A fifth voltage measuring unit measuring a voltage between a terminal and a negative output terminal of the solar cell string, and a voltage measuring a voltage between an intermediate terminal between the module groups included in the solar cell string and a positive output terminal of the solar cell string. A voltage detector including a six voltage measurer;
The measured voltages measured by the first voltage measuring unit, the second voltage measuring unit, the third voltage measuring unit, the fourth voltage measuring unit, the fifth voltage measuring unit, and the sixth voltage measuring unit are analyzed. An abnormality detecting unit detecting an abnormality of a fuse, the backflow preventing diode, the circuit breaker, and the solar cell string; And
Intelligent photovoltaic power generation system comprising a communication unit for transmitting the detection signal detected by the abnormality detection unit to the central monitoring unit. The method of claim 5,
The connecting panel
Intelligent photovoltaic power generation system, characterized in that it further comprises an alarm unit for notifying the presence or absence of the abnormality detected by the abnormality detection unit.

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