WO2018155848A1

WO2018155848A1 - Electrical fire prevention system of solar power generation facility

Info

Publication number: WO2018155848A1
Application number: PCT/KR2018/001636
Authority: WO
Inventors: 이상원
Original assignee: 주식회사 디케이
Priority date: 2017-02-21
Filing date: 2018-02-07
Publication date: 2018-08-30
Also published as: KR101787528B1

Abstract

The present invention relates to an electrical fire prevention system of a solar photovoltaic power generation facility, and to an electrical fire prevention system of a solar photovoltaic power generation facility comprising: a unit solar photovoltaic string which includes at least one solar panel; a connection panel which collects solar photovoltaic power of the unit solar photovoltaic string; and an inverter which converts the solar photovoltaic power into commercial power, wherein the connection panel comprises: at least one connection electronic circuit board which implements a voltage and current sensing function, a reverse current prevention function, and a circuit protection function with respect to the solar photovoltaic power, measures the amount of power generated by the unit solar photovoltaic string, and determines whether or not the unit solar photovoltaic string is operating normally; a breaker which connects the solar photovoltaic power to the inverter; a plurality of connection terminals in which the connection electronic circuit board and the main solar photovoltaic power are connected, and which are installed between the solar panel and the connection electronic circuit board and between the connection electronic circuit board and the breaker, respectively; at least one connection failure detection sensor which detects heat generated at the connection terminal; and at least one connection failure display unit which integratedly manages the detection results of the plurality of connection failure detection sensors and displays the detected status of the connection failure of the connection terminal. Accordingly, the present invention can prevent the occurrence of an arc or can suppress the occurrence of a fire due to the occurrence of an arc by forming a cut-out portion in the connection electronic circuit board or sufficiently ensuring a separation distance between (+)/(-) conductors through a separation disposition of (+)/(-) conductors, and the present invention can detect and send notification of the connection failure at all the connection terminals through the connection failure detection sensor, which is a thermally sensitive element to prevent the fire of the connection panel, and as a result, the present invention can minimize the economic loss, casualties and spreading of the fire caused by a fire of the connection panel.

Description

Electric fire prevention system of photovoltaic power generation facilities

The present invention relates to an electrical fire prevention system of a photovoltaic power generation facility, and more particularly, to detect in real time the connection failure in the connection terminal in the connection electronic circuit board installed inside the connection panel, thereby causing a fire due to connection failure It relates to an electric fire prevention system of a photovoltaic power generation equipment that can prevent the in advance.

Photovoltaic power generation uses photovoltaic energy source, which is supplied indefinitely, and does not require mechanical moving parts, so it does not generate vibration and noise, and it is free to select power generation capacity according to installation space. It has advantages

However, since the Taewang photovoltaic power generation system uses a current source among DC power sources, there is always a possibility of fire, and in recent years, the photovoltaic power generation system is exploding and is expected to increase the possibility of fire.

On the other hand, when analyzing the fires of solar power system, most of them are DC power module and DC section, and in case of domestic, 28 cases of junction box fires were DC fired in official data compiled by the fire department, which is 48.2%. It can be seen that occupies. However, in addition to the fires compiled by the fire department, the loss of the access panel itself is considered to be 10 times larger than the statistical data in official data, and as the installation site increases rapidly, more fire damage is expected.

The photovoltaic system is based on a solar cell that converts light energy transmitted from sunlight into electrical energy, and a unit solar cell generates a small amount of energy to generate a photovoltaic module. It is then connected in series-parallel to produce direct current with high voltage and current. At this time, the photovoltaic power generation system uses a connection panel that collects the output cable of the photovoltaic module, that is, a string cable, into one place, and converts the high DC electricity summed from the connection panel into AC power through an inverter. Link to the system.

In a photovoltaic system, the junction board must connect individual strings in parallel in order to gather several solar string electrical energy created by several solar modules connected in series, so that electricity generated from one string cable cannot be circulated to another string cable. Reverse current protection diodes should be added.

Typically, the power generated by one solar string is about 2.KW, and in the case of a 100KW power plant, 40 solar strings must be connected in parallel. Thus, a plurality of electrical contacts are included in the connection panel, and a reverse current prevention diode must be used, and various electronic circuits for measuring voltage or current are recently installed for monitoring or control.

As described above, the solar power generation system may cause a fire due to poor electrical contact or overheating of a diode in a connection panel where electrical connections are gathered in one place. Therefore, when condensation occurs, a conductive path is formed at the point where the distance between the poles is shortest among the substrates inside the connection board, and an arc may occur, causing the most fire.

In particular, photovoltaic electricity acts as a direct current current source, which has characteristics that are quite different from commercial AC power. In other words, AC power is an alternating current in which the size and direction of electricity supplied from a power plant changes periodically, whereas DC power is an electric current that flows continuously, and thus, when a problem occurs in the DC power supply, the current is continuously supplied, leading to a fire.

As a technology for fire prevention of solar power generation system, there is a technology to prevent fire spread by operating a fire extinguishing device by installing a smoke detector inside the connection panel and detecting fire, arc or gas. Detection techniques, and the like.

Conventional techniques to detect fire or extinguish a fire by detecting an arc or a fire are to operate a breaker or extinguish a fire by using a fire extinguisher, but since the solar string is continuously supplying power. In practice, it is difficult to extinguish a fire, and there may be a risk of personal injury due to the electrical characteristics of the connection board where high voltage / high current flows.

On the other hand, as another technique for fire prevention of a photovoltaic power generation system, when a surveillance camera is installed inside a connection board, it is possible to constantly monitor a poor contact or an arc. In this case, the arc or fire monitoring inside the connection panel can use a general camera, but since the infrared camera must be installed in order to detect heat generation due to poor contact, it is not practical in that the installation cost is too expensive.

On the other hand, it is possible to measure heat by attaching a temperature IC sensor that can measure heat directly on the back or the periphery of the connection terminal.However, several expensive sensors are required to reduce the cost and cost of electronic circuits. In practical terms, the cable for connecting each sensor, that is, the communication cable, needs to be increased to reduce the number of sensors.

The present invention prevents the occurrence of arc in the connection electronic circuit board installed inside the connection panel, and detects the connection failure of all connection terminals with a high risk of fire through the connection failure detection sensor to display the connection failure status to the administrator The present invention provides an electrical fire prevention system for a photovoltaic power plant that can prevent fires on connection panels in advance.

In an embodiment, an electrical fire prevention system of a solar power installation includes a unit photovoltaic string including at least one solar panel, a connection panel for collecting photovoltaic power of the unit photovoltaic string, and the photovoltaic power generation. In the electrical fire prevention system of a solar power plant including an inverter for converting the commercial power, the connection panel, the voltage and current sensing function, the reverse current prevention function, the circuit protection function for the photovoltaic power generation At least one connection electronic circuit board for measuring the amount of power generated by the unit photovoltaic string and determining whether the unit photovoltaic string operates normally; A circuit breaker for connecting the photovoltaic power to the inverter; A plurality of connection terminals connected to the connection electronic circuit board and the main photovoltaic power generation and respectively provided between the solar panel and the connection electronic circuit board, and the connection electronic circuit board and the circuit breaker; At least one connection failure detection sensor configured to detect heat generated from the connection terminal; And at least one connection failure display unit configured to collectively manage detection results of the plurality of connection failure detection sensors and display a detection state of connection failure of the connection terminal.

In addition, the electric fire prevention system of the photovoltaic power generation equipment, the fuse for the circuit protection function of the connection panel, whether or not the connection terminal of the connection failure, the magnitude measurement of the generation current and the generation voltage of the unit photovoltaic string, internal It characterized in that it further comprises a connection panel integrated manager for performing integrated management of the access panel including the temperature monitoring function, and including a communication module for remote monitoring of the solar power plant.

The connection electronic circuit board uses an input connection terminal into which the generated power of the unit photovoltaic string is input, as a polarity separation terminal such that the (+) terminal and the (-) terminal are separated from each other, and generates the generated power of the unit photovoltaic string. The output connection terminal is characterized in that used in the form of a busbar.

The connection electronic circuit board is characterized in that the incision is formed in the center to form a distance separated by a predetermined distance between the (+) terminal and the (-) terminal.

When the connection electronic circuit board is connected to the (+) terminal and the (-) terminal of the unit photovoltaic string, a single connection terminal is formed in which only one polarity wire of either (+) polarity or (-) polarity is connected. Characterized in that the main current flows through a single connection terminal.

When the connection circuit board is connected to the (+) terminal and the (-) terminal of the unit solar string, the cable ducts are separated from each other so that the (+) polarity wire and the (-) polarity wire are separated from each other. The duct is characterized in that it is formed of a metallic material.

The connection failure detection sensor uses a thermistor, and at least three thermistors are connected in parallel for an input connection terminal, an output connection terminal, and a fuse terminal for circuit protection of the unit solar string.

The connection electronic circuit board may include a controller configured to measure the amount of power generated by the unit photovoltaic string through voltage and current sensing functions and to determine whether the unit photovoltaic string operates normally through a disconnection sensing function. It is characterized by implementing a fire prevention processing unit using a connection failure detection sensor.

The fire prevention processing unit may include a temperature measuring module configured to measure and display the temperature A when the temperature is higher than the set temperature reference and the temperature B when the temperature is lower than the set temperature reference through the connection failure detection sensor; A poor connection display module for comparing the A temperature and the B temperature with a preset alarm setting temperature and displaying individual connection failures when the A temperature and the B temperature are higher than the alarm setting temperature; When the temperature A and temperature B are lower than the alarm set temperature, when the temperature difference between the temperature A and temperature B is greater than a preset threshold when comparing the temperature A and temperature B, the first current and temperature B at the temperature A A poor connection determination module for comparing the difference between the second current at a temperature and determining that heat is generated due to a poor connection when the difference between the first current and the second current is small; And a communication module for integrating data generated from the temperature measuring module, the connection failure display module, and the connection failure determination module and transmitting the integrated data to the connection panel integrated manager for integrated management of the connection panel.

The integrated board integrated manager performs a fire analysis processing unit to analyze the data transmitted through the fire prevention processing unit, and the fire analysis processing unit measures the internal average temperature of the connecting panel, and the temperature A per unit solar string. A temperature information collection module for collecting the temperature B and B; A temperature correction module detecting the lowest and highest values of the A and B temperatures and correcting the collected A and B temperatures to a current temperature; An alarm generation module for comparing the highest value of the A temperature and the B temperature with a preset alarm setting temperature and generating an alarm if the highest value of the A temperature and the B temperature is higher than the alarm setting temperature; A cutoff operation module that outputs a cutoff signal instructing a cutoff operation of the circuit breaker when the maximum value of the A temperature and the B temperature exceeds a preset trip set value; And a communication module configured to collect information generated by the temperature information collection module, the temperature correction module, the alarm generation module, and the shut-off operation module as status information and transmit the status information to an external device.

Electric fire prevention system of the photovoltaic power generation equipment of the present invention, enough to secure the separation distance between the (+) / (-) conductors by making an incision in the connection electronic circuit board or by separating the (+) / (-) conductors By preventing the occurrence of arc or suppressing the occurrence of fire due to arc generation, all connection terminals can detect and notify this connection failure through the connection failure detection sensor, which is a heat sensitive element. As a result, it is possible to minimize economic losses, casualties, and spread of fire caused by fires at the junction.

1 is a view illustrating an electric fire prevention system of a solar power plant according to an embodiment of the present invention.

2 is a view for explaining the internal configuration and arrangement of a general connection panel.

3 is a view for explaining the internal configuration and arrangement of the electric fire prevention system of the solar power plant according to the present invention.

4 is a view for explaining a connection electronic circuit board which is a part of FIG. 1.

5 is a view for explaining a configuration of a fire prevention processing unit of the control unit which is a part of FIG. 1.

6 is a flowchart illustrating an operation of the fire prevention processor of FIG. 5.

FIG. 7 is a view for explaining a configuration of a fire analysis processing unit of the integrated access panel manager that is a part of FIG. 1.

FIG. 8 is a flowchart illustrating an operation of a fire analysis processing unit of FIG. 7.

Description of the present invention is only an embodiment for structural or functional description, the scope of the present invention should not be construed as limited by the embodiments described in the text. That is, since the embodiments may be variously modified and may have various forms, the scope of the present invention should be understood to include equivalents capable of realizing the technical idea. In addition, the objects or effects presented in the present invention does not mean that a specific embodiment should include all or only such effects, the scope of the present invention should not be understood as being limited thereby.

On the other hand, the meaning of the terms described in the present invention will be understood as follows.

Terms such as "first" and "second" are intended to distinguish one component from another component, and the scope of rights should not be limited by these terms. For example, the first component may be named a second component, and similarly, the second component may also be named a first component.

When a component is referred to as being "connected" to another component, it should be understood that there may be other components in between, although it may be directly connected to the other component. On the other hand, when a component is referred to as being "directly connected" to another component, it should be understood that there is no other component in between. On the other hand, other expressions describing the relationship between the components, such as "between" and "immediately between" or "neighboring to" and "directly neighboring to", should be interpreted as well.

Singular expressions should be understood to include plural expressions unless the context clearly indicates otherwise, and terms such as "comprise" or "have" refer to features, numbers, steps, operations, components, parts, or parts thereof described. It is to be understood that the combination is intended to be present and does not exclude in advance the possibility of the presence or addition of one or more other features or numbers, steps, operations, components, parts or combinations thereof.

In each step, an identification code (e.g., a, b, c, etc.) is used for convenience of description, and the identification code does not describe the order of the steps, and each step clearly indicates a specific order in context. Unless stated otherwise, they may occur out of the order noted. That is, each step may occur in the same order as specified, may be performed substantially simultaneously, or may be performed in the reverse order.

All terms used herein have the same meaning as commonly understood by one of ordinary skill in the art unless otherwise defined. Generally, the terms defined in the dictionary used are to be interpreted as being consistent with the meanings in the context of the related art, and should not be interpreted as having ideal or excessively formal meanings unless clearly defined in the present invention.

Referring to FIG. 1, a photovoltaic power generation facility includes a unit photovoltaic string 110 including at least one solar panel 100, a connection panel 200, and an inverter 300.

The solar panel 100 generates electrical energy by collecting incident sunlight, and the unit solar string 110 is a group in which at least one solar panel 100 is connected in series, and the connection panel 200 includes a plurality of solar panels 100. Collects the photovoltaic power of the unit photovoltaic string 110, the inverter 300 converts the photovoltaic power to commercial power and outputs.

The connection panel 200 includes a reverse current prevention diode 210, a circuit protection function fuse 220, a voltage sensing circuit unit 230 for detecting a generated voltage of the unit solar string 110, and a unit solar string 110. Current detection circuit unit 240 for detecting the generated current of the circuit breaker 225 for connecting or blocking the inverter 300, disconnection monitoring circuit unit 250 for detecting and displaying the defect of the fuse 220 and the diode 210 And the amount of power generated by each unit photovoltaic string 110 through the disconnection display circuit unit 260, the voltage sensing circuit unit 230, and the current sensing circuit unit 240, and the unit solar system through the disconnection sensing circuit unit 250. And a controller 215 for determining whether the optical string 110 is normally operated.

The connection panel 200 includes a reverse current prevention diode 210, a protection function fuse 220, a voltage sensing circuit unit 230, a current sensing circuit unit 240, a disconnection monitoring circuit unit 250, a disconnection display circuit unit 260, and The control unit 215 is implemented on the connection electronic circuit board 205, and the connection electronic circuit board 205 is provided with each unit photovoltaic string through a connection terminal 270 provided at a portion where photovoltaic power generation is input and output. 110 solar power is connected.

At this time, since connection failure may occur in the connection terminal 270 through which high voltage and high current flow, the connection panel 200 is provided with a connection failure detection sensor 280 around or below the connection terminal 270 to connect the connection terminal ( And a connection failure display unit 290 which detects heat generated from the operation 270 and individually displays a connection failure state while managing the connection failure detection sensor 280 integrally.

Conventionally, in order to detect heat due to poor connection, the connection circuit board 205 is equipped with an expensive sensor for detecting smoke, arc, or gas. By attaching a connection failure detection sensor 280 which is a sensor, it is possible to detect heat generated by a connection failure in real time.

The connection failure detection sensor 280 uses a thermistor whose resistance value varies with temperature. As an example, the thermistor is a thermally sensitive element that varies from 10 degrees at 25 degrees, 5 degrees at 40 degrees, and 1.2 degrees at 80 degrees.

Since the connection failure detection sensor 280 has to be installed at the input connection terminal, the output connection terminal, and the fuse terminal of each unit solar string 110, at least three are required for each connection electronic circuit board 205.

In the case of using three connection failure detection sensors 280, a complicated calculation circuit for reading the amount of change in the resistance value and converting it into temperature must be added. In the present invention, in order to reduce the complexity of the circuit, three connection failure detection sensors 280 are connected in series or in parallel to operate as one sensor. In the present invention, three connection failure detection sensors 280 are connected in parallel to detect a high temperature, so as to sense the maximum temperature with a minimum resistance value.

On the other hand, the connection panel 200 measures the magnitude of the voltage and current of all the unit photovoltaic string 110, the disconnection of the fuse 220, the connection failure of the connection terminal 270, and the connection of the connection panel 200 An integrated management unit 295 is included to monitor the internal temperature, and the integrated manager 295 may remotely communicate with an external device through a communication module (not shown).

2 is a view for explaining the internal configuration and arrangement of the general connection panel, Figure 3 is a view for explaining the internal configuration and arrangement of the electric fire prevention system of the solar power plant according to the present invention.

Referring to FIG. 2, in the general connection panel 200, unit solar strings 110 are connected in parallel, and the generated power of all unit solar strings 110 is collected and sent to the inverter 300. That is, all the unit photovoltaic strings 110 are connected to the breaker 225 through the connection electronic circuit board 205. Therefore, the connection electronic circuit board 205 is designed to have electrical stability sufficiently, and the connection terminal 270 connected to the outside is formed of a material having a minimum withstand voltage rating of 1000V.

In addition, the connection electronic circuit board 205 is arranged to separate input and output of the connection terminal 270 to the left and right (or up and down) for convenience of connection and circuit design.

However, in extreme conditions such as seaside offshore and high humidity, condensation may occur inside, and condensation may occur at a point where the distance between poles of the connection circuit board 205 is shortest. An electrically conductive path may be formed to generate an arc. In particular, since the power generated by the solar string 110 is operated as a DC current source, a situation in which a single arc occurs may lead to a large fire.

Therefore, the electric fire prevention system of the photovoltaic power generation facility of the present invention, as shown in Figure 3, is arranged to ensure the separation distance between the (+) lead and the (-) lead of the solar string 110.

In order to prevent fires due to arcs generated inside the connection panel 200 in advance, a polarity separation terminal (I) is provided to sufficiently space between the (+) and (-) terminals of the input connection terminal of the solar string 110. 271, a connection terminal block 273 of the output connection terminal from which the generated power of the unit solar string 110 is output is used in the form of a busbar.

In this case, the

insulation fixing devices

301 and 302 for electrical insulation are installed in the conductive wires disposed inside the connection panel 200, and the insulation fixing device 303 is also provided in the bus bar connection terminal block 273. Is installed.

That is, by using the polarity-separating terminal block 271 separating the (+) terminal and the (-) terminal from each other, the input connection terminal of the lower side into which the photovoltaic power of the unit solar string 110 is inputted (+) Arc generation can be physically suppressed by preventing the conducting wire and the negative conducting wire from being simultaneously connected in one connection electronic circuit board 205. In addition, the output connection terminal 273 of each unit photovoltaic string 110 applies a busbar shape in order to reduce the use of cable wires that are likely to cause contact failure.

As shown in (a) of FIG. 4, the connection electronic circuit board 205 in the general connection panel has an input terminal of the solar string 110 and a (+) terminal for convenience of arrangement and connection of internal components. The (-) terminal is connected at the same time, and the output terminal is also connected to the breaker 225 at the same time the (+) terminal and the (-) terminal.

The connection electronic circuit board 205 may have a high incidence rate of arcing when moisture or conductive foreign substances are inserted due to external factors even if a positive separation distance between the (+) lead and the (-) lead is secured. When carbonization due to an arc occurs, the connection electronic circuit board 205, which is an electrical insulator, becomes a conductor to form a complete conductive path, which causes a high current to flow on the connection electronic circuit board 205, resulting in a fire.

Referring to FIG. 4B, the connection electronic circuit board 205 is formed with a cutout 206 cut in the center at a predetermined length, and the cutout 206 includes a positive terminal and a negative terminal. Physically secure the separation distance between terminals.

The connection electronic circuit board 205 having the cutout 206 formed thereon is a large amount of conductive foreign matter temporarily attached thereto. Does not flow, only the carbonized parts are damaged and no fire occurs.

Referring to FIG. 4C, the connection electronic circuit board 205 has a single connection terminal 274 formed such that the connection electronic circuit board is connected to only one of the polarity wires of either the positive polarity or the negative polarity. do. At this time, the single connection terminal 274 is a (-) terminal, the main current flows through the (-) terminal. In this case, the voltage measurement uses a (+) terminal through which no current flows, that is, an S + terminal 275. Since the current does not flow through the S + terminal, the possibility of arc generation is very slim.

In addition, the connection electronic circuit board 205 is connected to the positive and negative terminals of each solar string 110 so that the positive polarity wires of (+) / (-) are not disposed in one cable duct. Cable ducts for (+) conductors and cable ducts for (-) conductors are separated from each other on the left and right sides, and cable ducts are also made of metal because plastic materials are vulnerable to fire.

Due to the arrangement state of the polarity separating terminal 271 and the conductive wire, the connection electronic circuit board 205 can secure the stability by significantly reducing the possibility of arc generation even when conductive foreign matter is attached, and poor connection at the polarity separating terminal 271. Even though heat is generated, it is only disconnected and there is no fire.

5 is a view for explaining the configuration of the fire prevention processing unit of the control unit, which is a part of FIG. 1, and FIG. 6 is a flowchart illustrating the operation of the fire prevention processing unit of FIG. 5.

5 and 6, the plurality of connection failure detection sensors 280 connected in parallel detect a plurality of connection failures in the controller 215 because the overall resistance decreases when the ambient temperature of the connection terminal 270 increases on average. It may be difficult to determine which of the sensors 280 detects the temperature rise.

Accordingly, the fire prevention processing unit 400 implements the fire prevention processing unit 400 using the connection failure detection sensor 280 in which the control unit 215 is connected to the internal average temperature of the connection panel 200 and other connected electronic circuit boards. It compares with the temperature of 205, and compares the current current amount difference to detect whether the connection terminal 270 is defective.

To this end, the fire prevention processor 400 includes a temperature measuring module 410, a connection failure display module 420, a connection failure determination module 430, and a communication module 440.

The temperature measuring module 410 measures and displays the A temperature and the B temperature of the connection terminals at different positions through the connection failure detection sensor 280. (S101)

The connection failure display module 420 compares the A temperature and the B temperature with the preset alarm set temperature, and when the A temperature and the B temperature are higher than the alarm set temperature, the individual connection failure with respect to the connection terminal 270 having the elevated temperature. (S102 to S104) For example, an identification number or an identification color (for example, colored LEDs) is preset for each connection failure detection sensor 280 installed at an input connection terminal, an output connection terminal, and a fuse terminal. In addition, the connection failure display unit 290 displays the identification number or identification color of the connection failure detection sensor 280 that detects the temperature rise to identify which connection terminal 270 has occurred.

If the A temperature and the B temperature are higher than the alarm set temperature, there is no risk of fire, but the connection failure determination module 430 compares the A temperature and the B temperature in order to check the heat generation state at the connection terminal 270. (S105) That is, the connection failure determination module 430 compares the A temperature and the B temperature relative to each other at the first current and the B temperature at the A temperature when the temperature difference between the A temperature and the B temperature is larger than the preset threshold. Comparing the difference between the second current of the two, if the difference between the first current and the second current is small, it is determined that the heat generated by the connection failure, and separately alarm the connection failure status. (S106 ~ S109)

The communication module 440 integrates the data generated by the temperature measuring module 410, the connection failure display module 420, and the connection failure determination module 430, and transmits the data to the connection panel integrated manager 295 (S110).

FIG. 7 is a view for explaining a configuration of a fire analysis processing unit of the integrated access panel managing unit, which is a part of FIG. 1, and FIG. 8 is a flowchart illustrating an operation of the fire analysis processing unit of FIG. 7.

The control unit 215 of the connection electronic circuit board 205 performs the analysis and fire prevention operation of the temperature measured primarily by the connection failure detection sensor 280 through the fire prevention processing unit, and the connection panel integrated manager 295 The fire analysis processing unit 700 is performed to precisely analyze the secondary data using the data transmitted through the fire prevention processing unit 400.

Referring to FIGS. 7 and 8, the fire analysis processor 700 includes a temperature information collection module 710, a temperature correction module 720, an alarm generation module 730, a blocking operation module 740, and a communication module 750. It includes.

The temperature information collecting module 710 measures the internal average temperature of the access panel 200, collects the A temperature and the B temperature of the unit photovoltaic string transmitted through the fire prevention processor 400, and for each unit photovoltaic string. Collect status information. (S201, S202)

Since the connection failure detection sensor 280 is a thermistor which is a thermal element connected in parallel, the influence of the ambient temperature affects the measured temperature A and temperature B, and thus temperature correction. The module 720 performs the operation of correcting the measured temperature A and temperature B with the current temperature. That is, the thermistor used as the connection failure detection sensor 280 is not only to detect the heat generated by the connection failure in the connection terminal 270, but also affected by the reaction according to the ambient temperature, so the influence on the ambient temperature should be removed. .

Therefore, the temperature correction module 720 corrects the A temperature and the B temperature to the current temperature to remove the influence on the ambient temperature, and to detect only the connection failure, the A temperature and the B temperature of all the unit solar strings 110. The highest and lowest values are detected. (S203, S204)

The alarm generation module 730 issues an alarm and notifies the manager when the maximum value of the A temperature and the B temperature becomes higher than the preset alarm set temperature compared to the preset alarm set temperature. , S206)

In addition, the blocking operation module 740 blocks the flow of current by operating the circuit breaker 225 connected to the inverter 300 when the maximum value of the A temperature and the B temperature is lower than the alarm setting temperature but exceeds the trip setting value. Shut off in advance so that heat caused by poor connection may not be caused by fire. (S207, S208)

The communication module 750 integrates the information generated by the temperature information collection module 710, the temperature correction module 720, the alarm generation module 730, and the shut down operation module 740 into status information for remote monitoring by an administrator. Remotely transmit to an external device (S209).

Although described above with reference to a preferred embodiment of the present invention, those skilled in the art will be variously modified and changed within the scope of the invention without departing from the spirit and scope of the invention described in the claims below I can understand that you can.

Claims

Electricity of a photovoltaic facility comprising a unit photovoltaic string comprising at least one solar panel, a connection panel for collecting the photovoltaic power of the unit photovoltaic string, and an inverter converting the photovoltaic power into commercial power. In the fire prevention system,

The connecting panel,

Implement the voltage and current detection function, the reverse current prevention function, the circuit protection function for the photovoltaic power generation, and measures the amount of power generated by the unit photovoltaic string, and determines whether the unit photovoltaic string operates normally At least one connection electronic circuit board;

A circuit breaker for connecting the photovoltaic power to the inverter;

A plurality of connection terminals connected to the connection electronic circuit board and the main photovoltaic power generation and respectively provided between the solar panel and the connection electronic circuit board, and the connection electronic circuit board and the circuit breaker;

At least one connection failure detection sensor configured to detect heat generated from the connection terminal; And

And at least one connection failure display unit configured to collectively manage detection results of the plurality of connection failure detection sensors and display a detection state of connection failure of the connection terminal.
The method of claim 1,

Integrated management of the connection panel including the disconnection of the fuse for the circuit protection function of the connection panel, the connection failure of the connection terminal, the measurement of the magnitude of the generated current and the generated voltage of the unit solar string, and the monitoring of the internal temperature And an access panel integrated manager including a communication module for remote monitoring of the photovoltaic power generation facility.
The method of claim 1,

The connection electronic circuit board,

The polarity separating terminal is used so that the (+) terminal and the (-) terminal are separated from the input connection terminal to which the generated power of the unit solar string is input.

An electric fire prevention system of a solar power plant according to claim 1, wherein a connection terminal block of an output connection terminal through which the generated power of the unit solar string is output is used in the form of a bus bar.
The method of claim 1,

The connection electronic circuit board is an electrical fire prevention system of a solar power plant, characterized in that the incision is formed in the center to form a distance separated by a predetermined distance between the (+) terminal and the (-) terminal.
The method of claim 1,

When the connection electronic circuit board is connected to the (+) terminal and the (-) terminal of the unit photovoltaic string, a single connection terminal is formed in which only one polarity wire of either (+) polarity or (-) polarity is connected. An electric fire prevention system of a solar power plant, characterized in that the main current flows through a single connection terminal.
The method of claim 1,

When the connection circuit board is connected to the (+) terminal and the (-) terminal of the unit solar string, the cable ducts are separated from each other so that the (+) polarity wire and the (-) polarity wire are separated from each other. Electric fire prevention system of a solar power plant, characterized in that the duct is formed of a metallic material.
The method of claim 1,

The connection failure detection sensor uses a thermistor, and at least three thermistors are connected in parallel for an input connection terminal, an output connection terminal, and a fuse terminal for circuit protection of the unit solar string. Electric fire prevention system.
The method of claim 1,

The connection electronic circuit board includes a control unit for measuring the amount of power generated by the unit photovoltaic string through the voltage and current sensing function, and determines whether the unit photovoltaic string is operating normally through the disconnection sensing function,

The control unit is an electrical fire prevention system of the solar power plant, characterized in that it comprises a fire prevention processing unit using the connection failure detection sensor.
The method of claim 8,

The fire prevention processing unit,

A temperature measuring module for measuring and displaying the A temperature and the B temperature of the connection terminals at different positions through the connection failure detection sensor;

A poor connection display module for comparing the A temperature and the B temperature with a preset alarm setting temperature and displaying individual connection failures when the A temperature and the B temperature are higher than the alarm setting temperature;

When the temperature A and temperature B are lower than the alarm set temperature, when the temperature difference between the temperature A and temperature B is greater than a preset threshold when comparing the temperature A and temperature B, the first current and temperature B at the temperature A A poor connection determination module for comparing the difference between the second current at a temperature and determining that heat is generated due to a poor connection when the difference between the first current and the second current is small; And

And a communication module for integrating the data generated by the temperature measuring module, the connection failure display module, and the connection failure determination module and transmitting the integrated data to the connection panel integrated manager for integrated management of the connection panel. Electric fire prevention system.
The method of claim 9,

The access panel integrated manager performs a fire analysis processing unit to analyze using data transmitted through the fire prevention processing unit,

The fire analysis processing unit,

A temperature information collection module which measures an internal average temperature of the connection panel and collects A temperature and B temperature for each unit solar string;

A temperature correction module for correcting the collected A and B temperatures to a current temperature and detecting the lowest and highest values of the A and B temperatures;

An alarm generation module for comparing the highest value of the A temperature and the B temperature with a preset alarm setting temperature and generating an alarm if the highest value of the A temperature and the B temperature is higher than the alarm setting temperature;

A cutoff operation module that outputs a cutoff signal instructing a cutoff operation of the circuit breaker when the maximum value of the A temperature and the B temperature exceeds a preset trip set value; And

Electric fire prevention system of the solar power generation facility comprising a communication module for collecting the information generated by the temperature information collection module, temperature correction module, alarm generation module and the cut-off operation module as status information and transmits it to an external device. .