KR101706591B1 - Photovoltaic system with trip function for fire protection - Google Patents

Abstract

Various embodiments of the present invention relate to a photovoltaic power generation system having a trip function for fire prevention. An object of the present invention is to provide a photovoltaic power generation system which comprises a controllable DC-side blocking relay, and which turns off the DC-side blocking relay when a failure current is detected, thereby preventing a fire and providing a trip function. For this purpose, the present invention discloses the photovoltaic power generation system having a trip function for fire prevention, the photovoltaic power generation system comprising: a solar cell module; a solar connection board which is electrically connected to the solar cell module; and an inverter which is electrically connected to the solar connection board, which converts DC power into AC power, and which supplies the AC power to an AC system, wherein the inverter comprises: an input power sensor which measures DC-side input power; an output power sensor which measures AC-side output power; a relay which is disposed between a DC side and an AC side; and a control unit which turns off the relay when the input power measured by the input power sensor is different from the output power measured by the output power sensor.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a photovoltaic power generation system having a trip function for fire prevention,

Various embodiments of the present invention are directed to a photovoltaic power generation system having a trip function for fire prevention.

Generally, as shown in FIG. 1A, a solar power generation system 10 'includes a plurality of solar cell modules 11', a solar cell connection module 12 'connected to the solar cell module 11' (DC to AC) connected to the solar light connecting panel 12 ', and the AC system 14' is electrically connected to the solar light inverter 13 '. Here, the photovoltaic system 10 'generally has a DC breaker for safety reasons.

1B, the inverter 13 'of the photovoltaic system 10' includes a DC side breaker 13a 'such as an MCB having no blocking function against an overcurrent or an MCCB having a blocking function against an overcurrent, And a power conversion unit 13b '. However, in spite of the DC side breaker 13a ', a fire may occur due to an overcurrent or a fault current.

For example, if the cut-off current of the DC-side circuit breaker 13a 'is assumed to be approximately 200A, even if an electrical accident occurs when the solar radiation amount is low, the short circuit current output from the solar module 11' . However, even if the current is substantially 200 A or less, there is a problem that a fire may occur in spite of the DC side breaker 13a 'since a fire can sufficiently occur.

The above-described information disclosed in the background of the present invention is only for improving the understanding of the background of the present invention, and thus may include information not constituting the prior art.

Various embodiments of the present invention provide a photovoltaic power generation system having a trip function for fire prevention. For example, the photovoltaic power generation system according to an embodiment of the present invention includes a controllable DC-side shutdown relay and turns off the DC-side shutdown relay when a fault current is sensed to provide fire prevention and trip functions. As another example, the solar power generation system according to the embodiment of the present invention includes an electric arc sensor, and when the electric arc is detected, the DC side shutoff relay is turned off to provide a fire prevention and trip function. As another example, the solar power generation system according to an embodiment of the present invention transmits relay turn-off information to the application of the user smart device in real time, so that the user can immediately recognize the state of the system and take follow-up action.

A photovoltaic generation system having a trip function for fire prevention according to various embodiments of the present invention includes a solar cell module; A solar cell module electrically connected to the solar cell module; And an inverter electrically connected to the photovoltaic connection module to convert DC power into AC power and supply the DC power to the AC system, wherein the inverter includes an input power sensor for sensing DC input power; An output power sensor for sensing AC output power; A relay installed between the direct current side and the alternating current side; And a controller for turning off the relay when the input power sensed from the input power sensor is different from the output power sensed from the output power sensor.

Between the DC side and the AC side, an MCB (Main Circuit Breaker) having no blocking function against an overcurrent or an MCCB (Molded Case Circuit Breaker) having a blocking function against an overcurrent can be connected.

The inverter includes a door sensor for detecting whether the inverter is opened or closed; And an arc sensor for sensing an electric arc or a flame in the inverter, wherein the controller controls the relay when the electric arc or flame is detected by the arc sensor in a state in which door opening is not sensed by the door sensor Can be turned off.

The controller may not turn off the relay when the door sensor detects light by the arc sensor while the door opening is sensed by the door sensor.

The control unit may further include a communication module communicably connected to the Internet network, and the control unit may transmit the turn-off information to the application of the user smart device connected to the Internet in real time when the relay is turned off through the communication module Lt; / RTI >

The control unit may further include a communication module communicably connected to the Internet network. The control unit may control the arc sensor or the relay when the arc sensor or the flame is detected by the arc sensor through the communication module or when the relay is turned off, Off information to the application of the user smart device connected to the Internet network in real time.

The controller may further include a communication module connected to the Internet network, and the controller may transmit the real-time output power and the accumulated output power information to the application of the user smart device connected to the Internet through the communication module.

Various embodiments of the present invention provide a photovoltaic power generation system having a trip function for fire prevention. For example, the photovoltaic power generation system according to an embodiment of the present invention includes a controllable DC-side shutoff relay, so that the DC-side shutoff relay is turned off when a fault current is sensed to provide fire prevention and trip functions. As another example, the photovoltaic power generation system according to the embodiment of the present invention includes an electric arc sensor to turn off the relay for blocking the DC side when detecting an electric arc to provide a fire prevention function and a trip function. As another example, the solar power generation system according to the embodiment of the present invention transmits the relay turn-off information to the application of the user smart device in real time, so that the user can immediately recognize the state of the system and take follow-up action.

FIGS. 1A and 1B are block diagrams showing a configuration of a conventional photovoltaic power generation system.
2 is a block diagram showing the configuration of a photovoltaic power generation system having a trip function for fire prevention according to an embodiment of the present invention.
3 is a block diagram showing the configuration of a photovoltaic power generation system having a trip function for fire prevention according to another embodiment of the present invention.
4 is a block diagram showing the configuration of a photovoltaic power generation system having a trip function for fire prevention according to another embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

The embodiments of the present invention are described in order to more fully explain the present invention to those skilled in the art, and the following embodiments may be modified into various other forms, The present invention is not limited to the embodiment. Rather, these embodiments are provided so that this disclosure will be more faithful and complete, and will fully convey the scope of the invention to those skilled in the art.

In the following drawings, thickness and size of each layer are exaggerated for convenience and clarity of description, and the same reference numerals denote the same elements in the drawings. As used herein, the term "and / or" includes any and all combinations of one or more of the listed items. In the present specification, the term " connected "means not only the case where the A member and the B member are directly connected but also the case where the C member is interposed between the A member and the B member and the A member and the B member are indirectly connected do.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the singular forms "a," "an," and "the" include singular forms unless the context clearly dictates otherwise. Also, " comprise, " and / or "comprising, " when used in this specification, are intended to be interchangeable with the said forms, numbers, steps, operations, elements, elements and / And does not preclude the presence or addition of one or more other features, integers, operations, elements, elements, and / or groups.

Although the terms first, second, etc. are used herein to describe various elements, components, regions, layers and / or portions, these members, components, regions, layers and / It is obvious that no. These terms are only used to distinguish one member, component, region, layer or section from another region, layer or section. Thus, a first member, component, region, layer or section described below may refer to a second member, component, region, layer or section without departing from the teachings of the present invention.

It is to be understood that the terms related to space such as "beneath," "below," "lower," "above, But may be utilized for an easy understanding of other elements or features. Terms related to such a space are for easy understanding of the present invention depending on various process states or use conditions of the present invention, and are not intended to limit the present invention. For example, if an element or feature of the drawing is inverted, the element or feature described as "lower" or "below" will be "upper" or "above." Thus, "lower" is a concept encompassing "upper" or "lower ".

In addition, the controller (controller) and / or other associated equipment or components in accordance with the present invention may be implemented using any suitable hardware, firmware (e.g., custom semiconductor), software, or any appropriate combination of software, . For example, the various components of a controller (controller) and / or other associated equipment or components in accordance with the present invention may be formed on one integrated circuit chip or on a separate integrated circuit chip. In addition, the various components of the controller (controller) may be implemented on a flexible printed circuit film and formed on the same substrate as the tape carrier package, printed circuit board, or controller (controller). In addition, the various components of the controller (controller) may be a process or thread executing on one or more processors in one or more computing devices, which executes computer program instructions to perform various functions, And interact with other components. The computer program instructions are stored in a memory that can be executed on a computing device using standard memory devices, such as, for example, random access memory. The computer program instructions may also be stored in other non-transitory computer readable media, such as, for example, CD-ROMs, flash drives, and the like. Further, those skilled in the art will appreciate that the functions of the various computing devices may be combined with one another, integrated into one computing device, or the functionality of a particular computing device may be implemented within one or more other computing devices Lt; / RTI > can be dispersed in the < / RTI >

For example, the controller according to the present invention may be implemented as a central processing unit, a mass storage device such as a hard disk or solid state disk, a volatile memory device, an input device such as a keyboard or a mouse, an output device such as a monitor or a printer, Of commercial computers.

2 is a block diagram showing a configuration of a solar power generation system 100 having a trip function for fire prevention according to an embodiment of the present invention.

2, a solar power generation system 100 according to an embodiment of the present invention includes a solar cell module 110, a solar cell connection unit 120, and an inverter 130. In particular, the inverter 130 may further include a control unit 135 for turning off the relay 134 when the input power (current) and the output power (current) are different. Here, the control unit 135 may be installed inside the inverter 130 or separately installed outside the inverter 130.

The solar cell module 110 may include, for example, but not limited to, a plurality of solar cells, which convert light energy into electrical energy and output the same. The solar cell module 110 may include, for example, but not limited to, a crystalline solar cell and a thin-film solar cell. The crystalline solar cell may include a monocrystalline silicon solar cell and a polycrystalline silicon solar cell. The thin film type solar cell may include a thin film type solar cell such as a silicon thin film type solar cell, a compound thin film type solar cell, and a nanoparticle.

The photovoltaic module 120 is electrically connected to the solar cell module 110, for example, but not exclusively, to connect the plurality of solar cell modules 110 in series and / or in parallel do.

The inverter 130 is electrically connected to, for example and not limited to, the solar light connecting panel 120, and converts DC power into AC power and supplies the AC power to the AC system 140. In particular, inverter 130 may further include, for example, but not limited to, a power conversion unit 131 that performs maximum power point tracking control.

The inverter 130 may further include, for example, but not limited to, an input power sensor 132, an output power sensor 133, a relay 134, and a control unit 135.

The input power sensor 132 is connected between the solar cell connection unit 120 and the relay 134 to sense DC input power and transmit it to the controller 135. Here, the input power sensor 132 may be composed of, for example, but not limited to, a voltage sensor and a current sensor. By using the voltage obtained from the voltage sensor and the current obtained from the current sensor, And transmits it to the controller 135.

The output power sensor 133 is connected between the power conversion unit 131 and the AC system 140 to sense the AC output power and transmit the sensed output power to the controller 135. Here, the output power sensor 133 may be composed of, for example, but not limited to, a voltage sensor and a current sensor. Using the voltage obtained from the voltage sensor and the current obtained from the current sensor, And transmits it to the controller 135.

The relay 134 may be electrically connected between the input power sensor 132 and the MCB or MCCB 136a. That is, the relay 134 is provided between the direct current side and the alternating current side, electrically connects the direct current side and the alternating current side at the time of the turn-on, and electrically disconnects the direct current side and the alternating current side at the time of turn-off.

Here, the MCCBs 136a and 136b are provided on the DC side and the AC side, respectively, with the power conversion unit 131 of the inverter 130 as the center. Thus, in the embodiment of the present invention, when the DC side MCCB 136a is turned off, Side MCCB 136b are also turned off so that the reliability of the system can be further improved.

On the other hand, when the input power sensed from the input power sensor 132 and the output power sensed from the output power sensor 133 differ from each other by a certain range, the control unit 135 turns off the relay 134, To prevent the risk of

Since the DC input power and AC output power are substantially the same when the efficiency is 100%, the difference between the input power and the output power is approximately 1% to 10%, for example, though not limited thereto Can be set. That is, if the difference between the input power by the input power sensor 132 and the output power by the output power sensor 133 differs by about 1% to 10% or more, the control unit 135 turns off the relay 134 . More specifically, when the input power by the input power sensor 132 is approximately 100 kW while the output power by the output power sensor 133 is approximately 90 kW, the control unit 135 turns off the relay 134 , And fire caused by fault currents.

As described above, the embodiment of the present invention provides a photovoltaic generation system 100 having a trip function for fire prevention. That is, the solar power generation system 100 according to the embodiment of the present invention includes the input power sensor 132, the output power sensor 133, and the DC side shutdown relay 134, The relay 134 is quickly turned off so as to have a fire prevention function and a trip function.

3 is a block diagram showing the configuration of a solar power generation system 200 having a trip function for fire prevention according to another embodiment of the present invention. Here, the solar power generation system 200 shown in FIG. 3 may share the main features of the solar power generation system 100 shown in FIG.

As shown in FIG. 3, the inverter 230 may further include a door sensor 231 and an arc sensor 232. The door sensor 231 outputs a door open signal to the control unit 135 when the door of the inverter 230 is opened. The arc sensor 232 outputs an arc and / or flame generation signal to the control unit 135 when an electric arc and / or a flame is generated in the inverter 130. Here, the arc sensor 232 may generate a fire or an arc, for example, though not limited to, a general fire, an arc caused by a bolt tightening failure, an arc caused by contact between the wiring and the frame, It is used to detect the time.

The control unit 135 turns off the relay 134 when the electric arc and / or flame is detected by the arc sensor 232 in a state in which door opening is not sensed by the door sensor 231, .

When the door of the inverter is opened by the arc sensor 232 in the state that the door is opened by the door sensor 231, May be sensed) by not turning off the relay 134, thereby allowing the system 200 to operate normally.

Thus, various embodiments of the present invention provide a photovoltaic system 200 having a trip function for fire prevention. For example, the photovoltaic power generation system 200 according to an embodiment of the present invention includes the electric arc sensor 232 to turn off the DC side shutoff relay 134 when detecting an electric arc / flame, Function.

4 is a block diagram showing the configuration of a photovoltaic generation system 300 having a trip function for fire prevention according to another embodiment of the present invention. Here, the solar power generation system 300 shown in FIG. 4 may share the main features of the solar power generation systems 100, 200 shown in FIG. 1 and / or FIG.

As shown in FIG. 4, the inverter 330 may further include a communication module 331 communicatively coupled to the Internet network 332. More specifically, the control unit 135 may be connected to the communication module 331.

The control unit 135 also controls the application of the user smart device 333 connected to the Internet network 332 and / or the application of the external server 334 to turn off the turn-off information of the relay 134 via the communication module 331 And can be transmitted and displayed in real time. That is, the control unit 135 notifies the application of the user smart device 333 of an event corresponding to the turn-off of the relay 134 among the solar power generation system 300 in real time, thereby allowing the user to take an immediate follow-up action .

The control unit 135 may transmit the input power, the output power, and / or the accumulated output power information through the communication module 331 to the application of the user smart device 333 connected to the Internet network 332 and / In real time. Accordingly, the user can monitor the power generation amount of the solar power generation system 300 through the smart device 333 and / or the external server 334, and can take follow-up action in case of an error.

Further, the control unit 135 may control the arc detection information and / or the relay 134 when the arc sensor 232 detects the arc and / or flame through the communication module 331 and / or when the relay 134 is turned off. Off information to the application of the user smart device 333 connected to the Internet network 332 and / or to the external server 334 in real time. Thus, the user can grasp the state of the solar power generation system 300 in real time and take immediate follow-up action.

The communication module 331 may be connected to the Internet network 332 via an LTE network and may be connected to the Internet network 332 and the user smart device 333 via WIFI, They can be interconnected via LTE networks.

Thus, various embodiments of the present invention provide a photovoltaic power generation system 300 having a trip function for fire prevention. In one example, the solar power generation system 300 according to an embodiment of the present invention transmits the turn-off information of the relay 134 to the application of the user smart device 333 in real time, Take immediate action and follow up.

It is to be understood that the present invention is not limited to the above-described embodiment, and various modifications and changes may be made without departing from the scope of the present invention. It will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined in the appended claims.

100, 200, 300; Solar power system
110; Solar cell module 120; Photovoltaic connection board
130; Inverter 131; Power conversion section
132; An input power sensor 133; Output power sensor
134; Relay 135; The control unit
136a, 136b; MCB or MCCB 140; AC system
230; Inverter 231; Door sensor
232; Arc sensor 330; inverter
331; A communication module 332; Internet network
333; User smart device 334; External server

Claims (7)

Solar cell module;
A solar cell module electrically connected to the solar cell module;
And an inverter electrically connected to the photovoltaic connection unit to convert DC power into AC power and supply the AC power to the AC system,
The inverter
An input power sensor for sensing DC input power;
An output power sensor for sensing AC output power;
A relay installed between the direct current side and the alternating current side; And
And a controller for turning off the relay if the input power sensed by the input power sensor and the output power sensed by the output power sensor differ by 1% to 10% or more,
The inverter
A door sensor for detecting whether or not the door of the inverter is opened; And
Further comprising an arc sensor for sensing electric arc or flame in the inverter,
Wherein the controller turns off the relay when an electric arc or a flame is detected by the arc sensor in a state in which door opening is not sensed by the door sensor,
Wherein the control unit does not turn off the relay when the door sensor detects light by the arc sensor while the door is being opened by the door sensor. The method according to claim 1,
Characterized in that an MCB (Main Circuit Breaker) having no blocking function against an overcurrent or a MCCB (Molded Case Circuit Breaker) having a blocking function against an overcurrent is connected between the DC side and the AC side, Solar power system. delete delete The method according to claim 1,
The control unit may further include a communication module communicably connected to the Internet network,
Wherein the control unit transmits the turn-off information to the application of the user smart device connected to the Internet in real time when the relay is turned off through the communication module. The method according to claim 1,
The control unit may further include a communication module communicably connected to the Internet network,
The control unit transmits arc sensing information or relay turn-off information to an application of a user smart device connected to the Internet in real time when an arc or flame is detected by the arc sensor through the communication module or when the relay is turned off Solar power generation system with trip function for fire prevention which is characterized by. The method according to claim 1,
The control unit may further include a communication module connected to the Internet network,
Wherein the control unit transmits real-time output power and cumulative output power information through the communication module to an application of a user smart device connected to the Internet network.

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