WO2020251273A1

WO2020251273A1 - Monitoring device and solar system comprising same

Info

Publication number: WO2020251273A1
Application number: PCT/KR2020/007570
Authority: WO
Inventors: 도현호; 윤주환; 김명환; 한동호
Original assignee: 엘지전자 주식회사
Priority date: 2019-06-13
Filing date: 2020-06-11
Publication date: 2020-12-17
Also published as: KR20200142866A

Abstract

The present invention relates to a monitoring device and a solar system comprising same. A monitoring device and a solar system comprising same according to an embodiment of the present invention may comprise: a processor which receives AC current detection information from a current detection unit for detecting current of AC power input from at least one external solar module; a communication unit which transmits AC current detection information to an external gateway or server according to a power line communication scheme; and a power supply unit which includes a converter for converting, into DC power, AC power input from the outside, and supplies the converted DC power to the processor or the communication unit. Accordingly, information on AC power input from various external solar modules can be stably monitored.

Description

Monitoring device, and solar system having the same

The present invention relates to a monitoring device, and a solar system having the same, and more particularly, a monitoring device capable of stably monitoring information on AC power input from various external solar modules, and It relates to a solar system.

On the other hand, the present invention relates to a monitoring device, and a solar system having the same, and more particularly, a monitoring device capable of stably monitoring information on AC power input from various external string inverters, and provided with the same. It relates to a solar system.

The solar system includes a solar module that outputs power through a solar cell, and a gateway for collecting and managing information on the solar module.

When the solar module is installed, a gateway is required to collect information on the solar module, and for this, communication must be performed between the solar module and the gateway.

Korean Patent Registration No. 10-1409781 (hereinafter referred to as'priority document 1') discloses a system for monitoring the state of a photovoltaic power generation facility including a plurality of solar cell panels, and in particular, in each panel Disclosed are a monitoring device that detects output voltage and current and transmits the detected data wirelessly, and a server that receives and stores data wirelessly transmitted from the monitoring device.

According to the prior document 1, since data is transmitted through wireless communication, there is a disadvantage that when a communication failure occurs due to radio wave interference, stable monitoring cannot be performed.

Korean Patent Registration No. 10-1773412 (hereinafter referred to as'priority document 2') is a power line communication capable of resolving shadow areas of wireless communication by determining at least one of 2.4G and 5G frequency bands at the user's choice. Initiate a Wi-Fi terminal.

According to this Prior Document 2, it is a solution for resolving a shadow area for wireless communication, and has a disadvantage in that monitoring of AC power from a solar module or the like cannot be performed.

An object of the present invention is to provide a monitoring device capable of stably monitoring information on AC power input from various external photovoltaic modules, and a photovoltaic system including the same.

Another object of the present invention is to provide a monitoring device capable of stably monitoring information on AC power input from various external string inverters, and a solar system having the same.

A monitoring device according to an embodiment of the present invention for achieving the above object, and a solar system including the same, includes AC current detection information from a current detection unit that detects a current of AC power input from at least one external solar module. And a processor for receiving, and a communication unit that transmits AC current detection information to an external gateway or server in a power line communication method, and a converter that converts AC power input from the outside into DC power, and converts the DC power to the processor or It may include a power supply to supply to the communication unit.

On the other hand, the converter can convert AC power from an external grid to DC power.

On the other hand, the monitoring device according to an embodiment of the present invention, and a solar system having the same, by performing power line communication with at least a portion of at least one external solar module, at least a portion of at least one external solar module It may further include a second communication unit for receiving the AC current information.

Meanwhile, when AC current information is received through the second communication unit, the processor may control to output at least one of AC current detection information or AC current information to the outside through the communication unit.

Meanwhile, when the AC current information is received through the second communication unit, the processor calculates the final AC current information using the AC current detection information and the AC current information, and uses the calculated final AC current information through the communication unit, It can be controlled to output to the outside.

On the other hand, when a circuit breaker for cutting off AC power is disposed between at least one external photovoltaic module and the monitoring device, the processor is provided with a control signal for turning off the circuit breaker when the level of AC current detection information is out of the allowable range. Can be controlled to output.

A monitoring device according to an embodiment of the present invention, and a solar system including the same, may further include a current detection unit that detects a current of an input AC power source.

On the other hand, the current detection unit can detect the current of the three-phase AC power supply.

Meanwhile, the current detection unit may non-contactly detect the input current of the AC power source.

On the other hand, the monitoring device is disposed in a power distribution device to which AC power from an external grid is input and AC power from an external solar module is input.

On the other hand, a monitoring device according to another embodiment of the present invention, and a solar system including the same, includes a processor that receives AC current detection information from a current detector that detects a current of AC power input from an external string inverter, and an external device. A power supply unit that includes a communication unit that transmits AC current detection information to the gateway or server of a power line communication method, and a converter that converts AC power input from the outside into DC power, and supplies the converted DC power to the processor or communication unit. Include.

On the other hand, the monitoring device according to another embodiment of the present invention, and the solar system having the same, further includes a second communication unit for receiving AC current information of the external string inverter by performing power line communication with an external string inverter can do.

Meanwhile, when a circuit breaker for cutting off AC power is disposed between an external string inverter and a monitoring device, the processor controls to output a control signal for turning off the circuit breaker when the level of AC current detection information is out of the allowable range. can do.

Meanwhile, the monitoring device according to another embodiment of the present invention and the solar system including the same may further include a current detection unit that detects a current of an input AC power source.

A monitoring device according to an embodiment of the present invention, and a solar system including the same, includes a processor for receiving AC current detection information from a current detection unit that detects a current of AC power input from at least one external solar module, A power supply that includes a communication unit that transmits AC current detection information to an external gateway or server in a power line communication method, a converter that converts AC power input from the outside into DC power, and supplies the converted DC power to the processor or communication unit. May contain wealth. Accordingly, it is possible to stably monitor information on AC power input from various external photovoltaic modules. In particular, it is possible to stably monitor information on AC power input from different solar modules.

Meanwhile, by transmitting the AC current detection information from the current detection unit to the outside through power line communication, it is possible to stably monitor through a gateway or the like.

In addition, since the gateway, which is the power generation transmission/reception device, is connected to a web server, the user can check the power generation amount anytime, anywhere.

On the other hand, the converter can convert AC power from an external grid to DC power. Accordingly, it is possible to stably supply DC power for driving the monitoring device through the converter.

On the other hand, the monitoring device according to an embodiment of the present invention, and a solar system having the same, by performing power line communication with at least a portion of at least one external solar module, at least a portion of at least one external solar module It may further include a second communication unit for receiving the AC current information. Accordingly, it is possible to receive information on at least some of the AC current of at least one external photovoltaic module separately from the current detector.

Meanwhile, when AC current information is received through the second communication unit, the processor may control to output at least one of AC current detection information or AC current information to the outside through the communication unit. Accordingly, it is possible to stably monitor information on AC power input from various external photovoltaic modules.

Meanwhile, when the AC current information is received through the second communication unit, the processor calculates the final AC current information using the AC current detection information and the AC current information, and uses the calculated final AC current information through the communication unit, It can be controlled to output to the outside. Accordingly, it is possible to stably monitor information on AC power input from various external photovoltaic modules.

On the other hand, when a circuit breaker for cutting off AC power is disposed between at least one external photovoltaic module and the monitoring device, the processor is provided with a control signal for turning off the circuit breaker when the level of AC current detection information is out of the allowable range. Can be controlled to output. Accordingly, it is possible to quickly turn off the operation of the breaker.

A monitoring device according to an embodiment of the present invention, and a solar system including the same, may further include a current detection unit that detects a current of an input AC power source. Accordingly, it is possible to stably monitor information on AC power input from various external photovoltaic modules.

On the other hand, the current detection unit can detect the current of the three-phase AC power supply. Accordingly, it is possible to stably monitor information on three-phase AC power input from various external photovoltaic modules.

Meanwhile, the current detection unit may non-contactly detect the input current of the AC power source. Accordingly, it is possible to stably monitor information on AC power without loss of power for AC power input from various external photovoltaic modules.

On the other hand, the monitoring device is disposed in a power distribution device to which AC power from an external grid is input and AC power from an external solar module is input. Accordingly, it is possible to stably monitor information on AC power input from various external photovoltaic modules through the monitoring device in the power distribution device.

On the other hand, a monitoring device according to another embodiment of the present invention, and a solar system including the same, includes a processor that receives AC current detection information from a current detector that detects a current of AC power input from an external string inverter, and an external device. A power supply unit that includes a communication unit that transmits AC current detection information to the gateway or server of a power line communication method, and a converter that converts AC power input from the outside into DC power, and supplies the converted DC power to the processor or communication unit. Include. Accordingly, it is possible to stably monitor information on AC power input from an external string inverter. In particular, it is possible to stably monitor information on AC power input from heterogeneous string inverters.

On the other hand, the monitoring device according to another embodiment of the present invention, and the solar system having the same, further includes a second communication unit for receiving AC current information of the external string inverter by performing power line communication with an external string inverter can do. Accordingly, it is possible to receive the AC current information of the external string inverter separately from the current detector.

Meanwhile, when AC current information is received through the second communication unit, the processor may control to output at least one of AC current detection information or AC current information to the outside through the communication unit. Accordingly, it is possible to stably monitor information on AC power input from an external string inverter.

Meanwhile, when the AC current information is received through the second communication unit, the processor calculates the final AC current information using the AC current detection information and the AC current information, and uses the calculated final AC current information through the communication unit, It can be controlled to output to the outside. Accordingly, it is possible to stably monitor information on AC power input from an external string inverter.

Meanwhile, when a circuit breaker for cutting off AC power is disposed between an external string inverter and a monitoring device, the processor controls to output a control signal for turning off the circuit breaker when the level of AC current detection information is out of the allowable range. can do. Accordingly, it is possible to quickly turn off the operation of the breaker.

Meanwhile, the monitoring device according to another embodiment of the present invention and the solar system including the same may further include a current detection unit that detects a current of an input AC power source. Accordingly, it is possible to stably monitor information on AC power input from an external string inverter.

1A is a view showing an example of a solar system including a solar module according to an embodiment of the present invention.

1B is a view showing another example of a solar system including a solar module according to an embodiment of the present invention.

1C is a diagram showing an example of a solar system including a solar module according to another embodiment of the present invention.

2A is an example of an internal block diagram of the monitoring device of FIGS. 1A to 1C.

2B is an example of an internal block diagram of the monitoring device of FIGS. 1A to 1C.

3 is a diagram illustrating a connection state between the current detection unit of FIG. 2B and the monitoring device.

4 is an example of an internal block diagram of the gateway of FIGS. 1A to 1C.

5A to 5D are views referenced for describing a method of operating the monitoring device of FIG. 2A.

6A to 6B are views referenced for describing a method of operating the monitoring device of FIG. 2C.

7 is a circuit diagram of a power conversion device in the solar module of FIGS. 1A to 1B.

In this specification, a method for stably monitoring information on AC power input from various external photovoltaic modules is proposed.

Hereinafter, the present invention will be described in more detail with reference to the drawings.

The suffixes "module" and "unit" for the constituent elements used in the following description are given in consideration of only the ease of writing in the present specification, and do not impart a particularly important meaning or role by themselves. Therefore, the "module" and "unit" may be used interchangeably with each other.

Referring to the drawings, a solar system 10a according to an embodiment of the present invention may include a solar module 50, a power distribution device 300, a gateway 80, an AP device 70, and the like.

The solar module 50 may include a junction box 200 including a solar cell module 100 and a power conversion device (500 in FIG. 7) that converts and outputs DC power from the solar cell module. have.

In the drawings, the junction box 200 is attached to the rear surface of the solar cell module 100, but is not limited thereto. The junction box 200 may be provided separately from the solar cell module 100.

On the other hand, AC power output from the junction box 200 is supplied to the power distribution device 300.

The power distribution device 300 may receive AC power from the solar module 50 and may also receive AC power from an external grid 90.

In addition, the power distribution device 300 can supply AC power to the internal power grid inside the building by using AC power from the solar module 50 and AC power from the external grid 90.

In the drawing, an AC power cable (ACC) is disposed in a power network inside a building, and the gateway 80 is electrically connected to the AC power cable (ACC).

On the other hand, although not shown in the drawing, an electric device (not shown) is connected to an AC power cable (ACC), which is a power network inside a building, and internal AC power can be consumed.

The AP device 70 provides a wired or wireless network to various types of electric devices inside a building. Meanwhile, the AP device 70 may be connected to the external server 75 through an external network.

In the drawing, a terminal such as a laptop 60a and a mobile terminal 60b is wirelessly connected to the AP device 70.

Meanwhile, the external server 75 may be remotely connected to the gateway 80 or the AP device 70 through an external network.

Meanwhile, the gateway 80 and the AP device 70 may be electrically connected through a network cable (ECC).

Meanwhile, in the power distribution device 300, current information of AC power input from the external solar module 50 is detected, and the detected AC current information is transmitted to the external gateway 80 through power line communication. A monitoring device 320 may be disposed.

Meanwhile, in the power distribution device 300, a circuit breaker 310 for cutting off AC power input from an external solar module 50, AC power input from an external solar module 50, and an external grid A distribution device 330 for distributing AC power input from 90 and supplying it to the internal power grid inside the building may be further disposed.

The monitoring device 320 according to an embodiment of the present invention includes a processor 327 receiving AC current detection information from a current detection unit 322 that detects a current of an input AC power, and an external gateway 80 or server. A communication unit 323 that transmits AC current detection information to 75 by a power line communication method, a converter (CVT) that converts AC power input from the outside into DC power, and converts the converted DC power to the processor 327 Alternatively, it may include a power supply unit 329 supplied to the communication unit 323.

Accordingly, it is possible to stably monitor information on AC power input from the external photovoltaic module 50.

In particular, since the manufacturers of the external solar module 50 and the gateway 80 are different, information on the AC current for the external solar module 50 is not received from the external solar module 50. In the case, by using the AC current detection information detected from the current detection unit 322, by transmitting the AC current detection information to the external gateway 80 or server 75 in a power line communication method, input from the solar module 50 It is possible to stably monitor information on the AC power supply. In particular, it is possible to stably monitor information on AC power input from different solar modules.

In addition, since the gateway 80, which is a power transmission/reception device, is connected to the server 75 or the like, the user can check the power generation anytime, anywhere.

On the other hand, the converter CVT can convert AC power from the external grid 90 to DC power. Accordingly, it is possible to stably supply DC power for driving the monitoring device 320 through the converter CVT.

Next, FIG. 1B is a diagram showing another example of a solar system including a solar module according to an embodiment of the present invention.

Referring to the drawings, a solar system 10b according to an embodiment of the present invention includes a plurality of solar modules 50a-50n, a power distribution device 300, a gateway 80, an AP device 70, and the like. can do.

The photovoltaic system 10b of FIG. 1B differs from the photovoltaic system 10a of FIG. 1A in that a plurality of

photovoltaic modules

50a, 50b, ..., 50n are connected in parallel with each other.

Each of the plurality of

photovoltaic modules

50a, 50b, ..., 50n is a circuit for converting and outputting power by converting DC power from each photovoltaic module 100a, 100b, ..., 100n, and a solar cell

module Junction boxes

200a, 200b, ..., 200n including elements may be provided.

In the drawings, each junction box (200a, 200b, ..., 200n) is shown to be attached to the rear surface of each solar cell module (100a, 100b, ..., 100n), but is not limited thereto. Each junction box (200a, 200b, ..., 200n) may be provided separately from each of the solar cell modules (100a, 100b, ..., 100n).

On the other hand,

cables

31a, 31b, ..., 31n for outputting the AC power output from each

junction box

200a, 200b, ..., 200n, each

junction box

200a, 200b, ... , 200n) can be electrically connected to the output terminal.

On the other hand, AC power output from each of the

junction boxes

200a, 200b, ..., 200n is supplied to the power distribution device 300.

The power distribution device 300 may receive AC power from a plurality of photovoltaic modules 50a to 50n and may also receive AC power from an external grid 90.

In addition, the power distribution device 300 can supply AC power to the internal power grid inside the building by using AC power from a plurality of solar modules 50a to 50n and AC power from an external grid 90. have.

On the other hand, in the power distribution device 300, current information of AC power input from a plurality of external photovoltaic modules 50a to 50n is detected, and the detected AC current information is transferred to an external gateway 80, and power line communication Through, the transmitting monitoring device 320 may be arranged.

On the other hand, in the power distribution device 300, a circuit breaker 310 for cutting off AC power input from a plurality of external photovoltaic modules 50a to 50n, and a plurality of external photovoltaic modules 50a to 50n. A distribution device 330 that distributes the input AC power and the AC power input from the external grid 90 and supplies it to the internal power grid inside the building may be further disposed.

Accordingly, it is possible to stably monitor information on AC power input from a plurality of external photovoltaic modules 50a to 50n.

In particular, at least some of the plurality of external photovoltaic modules (50a ~ 50n), the manufacturer of the gateway 80 is different, information on the AC current for at least a portion of the plurality of external photovoltaic modules (50a ~ 50n) A, when not received from at least some of the plurality of external photovoltaic modules (50a ~ 50n), by using the AC current detection information detected from the current detection unit 322, the external gateway 80 or server 75 By transmitting the AC current detection information in a power line communication method, it is possible to stably monitor information on the AC power input from the plurality of solar modules 50a to 50n.

Accordingly, it is possible to stably monitor information on AC power input from different types of solar modules.

Next, FIG. 1C is a diagram showing an example of a solar system including a solar module according to another embodiment of the present invention.

Referring to the drawings, a solar system 10c according to an embodiment of the present invention includes a string inverter 30 connected to a plurality of solar modules 51a to 51n, a plurality of solar modules 51a to 51n, It may include a power distribution device 300, a gateway 80, an AP device 70, and the like.

In the solar system 10c of FIG. 1C, unlike the solar system 10a of FIG. 1B, a plurality of

solar modules

51a, 51b, ..., 51n connected in series with each other outputs a DC power supply. , There is a difference in that the string inverter 30 is connected to the output terminals of the plurality of

solar modules

51a, 51b, ..., 51n.

Each of the plurality of

photovoltaic modules

51a, 51b, ..., 51n is a circuit for converting and outputting power by converting DC power from each photovoltaic module 100a, 100b, ..., 100n, and a solar cell

module Junction boxes

201a, 201b, ..., 201n including elements may be provided.

In the drawings, each

junction box

201a, 201b, ..., 201n is shown to be attached to the rear surface of each solar cell module 100a, 100b, ..., 100n, but is not limited thereto. Each of the

junction boxes

201a, 201b, ..., 201n may be provided separately from each of the solar cell modules 100a, 100b, ..., 100n.

On the other hand,

cables

31a, 31b, ..., 31n for outputting DC power output from each of the

junction boxes

201a, 201b, ..., 201n are provided with each of the

junction boxes

201a, 201b, ... , 201n) can be electrically connected to the output terminal.

Meanwhile, DC power output from each of the

junction boxes

201a, 201b, ..., 201n is supplied to the string inverter 30.

The string inverter 30 converts DC power output from the plurality of

photovoltaic modules

51a, 51b, ..., 51n into AC power, and supplies the converted AC power to the power distribution device 300.

The power distribution device 300 may receive AC power from the string inverter 30 and may also receive AC power from an external grid 90.

In addition, the power distribution device 300 may supply AC power to an internal power grid inside the building by using AC power from the string inverter 30 and AC power from the external grid 90.

On the other hand, although not shown in the drawing, an electric device (not shown) is connected to an AC power cable (ACC), which is an electric power network inside a building, and internal AC power can be consumed.

Meanwhile, in the power distribution device 300, current information of AC power input from an external string inverter 30 is detected, and the detected AC current information is transmitted to an external gateway 80 through power line communication. A monitoring device 320 may be disposed.

On the other hand, in the power distribution device 300, a circuit breaker 310 for cutting off AC power input from an external string inverter 30, an AC power input from the external string inverter 30, and an external grid 90 A distribution device 330 for distributing AC power input from) and supplying it to the internal power grid inside the building may be further disposed.

The monitoring device 320 according to the embodiment of the present invention includes a processor 327 receiving AC current detection information from a current detection unit 322 that detects a current of AC power input from the string inverter 30, and an external device. A communication unit 323 that transmits AC current detection information to the gateway 80 or server 75 in a power line communication method, and a converter (CVT) that converts AC power input from the outside into DC power, and the converted DC current A power supply unit 329 for supplying power to the processor 327 or the communication unit 323 may be included.

Accordingly, it is possible to stably monitor information on AC power input from the external string inverter 30.

In particular, at least some of the external string inverters 30 are different from the manufacturer of the gateway 80, so that information on the AC current for at least some of the external string inverters 30 is When not received from at least a part, by using the AC current detection information detected from the current detection unit 322, by transmitting the AC current detection information to an external gateway 80 or server 75 by a power line communication method, a plurality of It is possible to stably monitor information on AC power input from the solar modules 51a to 51n.

For example, when the manufacturers of the string inverter 30 and the gateway 80 are different, information on AC power input from the string inverter 30 can be stably monitored.

Referring to the drawings, a monitoring device 320a according to an embodiment of the present invention includes a current detection unit 322 for detecting a current of an input AC power, and a processor for receiving AC current detection information from the current detection unit 322 ( 327), a communication unit 323 that transmits AC current detection information to an external gateway 80 or server 75 in a power line communication method, and a converter (CVT) that converts AC power input from the outside into DC power. Can be equipped.

Accordingly, it is possible to stably monitor information on AC power input from various external photovoltaic modules 50a to 50n. In particular, it is possible to stably monitor information on AC power input from different solar modules.

On the other hand, by transmitting the AC current detection information from the current detection unit 322 to the outside through power line communication, it is possible to stably monitor through the gateway 80 or the like.

Meanwhile, the converter CVT may be provided in the power supply unit 329.

The power supply unit 329 converts AC power from an external grid 90 into a DC power source, and converts the converted DC power supply (Vdc1, Vdc2, Vdc3) into a communication unit 323, a second communication unit 325, and a processor. As operation power for operation 327, it can be output.

On the other hand, the monitoring device 320a according to the embodiment of the present invention may further include a second communication unit 325 for receiving AC current information of at least a portion of at least one external photovoltaic module 50a to 50n. have. Accordingly, it is possible to receive information on at least some of the AC current of at least one external photovoltaic module 50a to 50n separately from the current detection unit 322.

On the other hand, the processor 327, when the AC current information is received through the second communication unit 325, control to output at least one of the AC current detection information or the AC current information to the outside through the communication unit 323. I can. Accordingly, it is possible to stably monitor information on AC power input from various external photovoltaic modules.

On the other hand, the processor 327, when the AC current information is received through the second communication unit 325, calculates the final AC current information by using the AC current detection information and the AC current information, and calculates the final AC current It is possible to control the information to be output to the outside through the communication unit 323. Accordingly, it is possible to stably monitor information on AC power input from various external photovoltaic modules.

On the other hand, when a circuit breaker 310 for cutting off AC power is disposed between at least one external photovoltaic module 50a to 50n and the monitoring device 320, the processor 327 may determine the level of AC current detection information. If it is out of the allowable range, it may be controlled to output a control signal for turning off the circuit breaker 310. Accordingly, the operation of the circuit breaker 310 can be quickly turned off.

On the other hand, the current detection unit 322 can detect the current of the three-phase AC power supply. Accordingly, it is possible to stably monitor information on three-phase AC power input from various external photovoltaic modules.

Meanwhile, the current detection unit 322 may non-contactly detect the current of the input AC power. Accordingly, it is possible to stably monitor information on AC power without loss of power for AC power input from various external photovoltaic modules.

Referring to the drawings, the monitoring device 320b of FIG. 2B is similar to the monitoring device 320a of FIG. 2A, but the current detection unit 322 is not included in the monitoring device 320b and is separately disposed outside. There is a difference.

Accordingly, the monitoring device 320b may be provided with terminals (TE1 to TE3 in FIG. 3) for receiving AC current detection information from the current detection unit 322.

Operations of the processor 327 and the communication unit 323 of the monitoring device 320b are omitted with reference to the description of FIG. 2A.

Referring to the drawings, the current detection unit 322 may detect a current of a three-phase AC power supply. Meanwhile, the current detection unit 322 may non-contactly detect the current of the input AC power.

In the drawing, the non-contact current transformers CT1 to CT3 are illustrated as the current detection unit 322 for detection of a three-phase AC power supply. Accordingly, it is possible to stably detect and monitor information on the AC power without loss of power to the AC power.

On the other hand, the AC current detection information of the three-phase AC power output from the current detection unit 322, through the terminal of the monitoring device 320 (TE1 to TE3 in Fig. 3), the processor 327 or the inside of the monitoring device (320b) It may be transmitted to the communication unit 323 or the like.

Accordingly, the processor 327 or the communication unit 323 may transmit the AC current detection information from the current detection unit 322 to the external gateway 80 through power line communication.

In particular, the processor 327 or the communication unit 323 outputs the AC power to the external gateway 80 and transmits the AC power to the external gateway 80 through power line communication that adds AC current detection information to the AC power source. I can. Accordingly, it is possible to stably monitor information on the input AC power.

Meanwhile, the monitoring device 320 may be electrically connected to a distribution device 330 supplied to an internal power grid inside the building.

For example, the monitoring device 320 may output a three-phase four-wire AC power source (NTSR) to the distribution device 330.

Accordingly, the distribution device 330 may distribute AC power input from an external sun, a module, and the like, and AC power input from an external grid 90 and supply it to an internal power network inside a building.

4 is an example of an internal block diagram of the gateway of FIGS. 1A to 1C.

Referring to the drawings, a gateway 80 according to an embodiment of the present invention includes a first communication unit 81 for power line communication, a processor 87, a memory 84, and a second communication unit 82 for network communication. Can be equipped.

The first communication unit 81 may receive AC current detection information from the monitoring device 320 through power line communication.

For example, the first communication unit 81, one solar module 50 of FIGS. 1A to 1C, or a plurality of solar modules 50a to 50n, or AC current from the string inverter 30 The detection information can be received through a power line communication method.

In addition, the processor 87 is received AC current detection information from one solar module 50, or a plurality of solar modules 50a to 50n, or the string inverter 30 of FIGS. 1A to 1C. May be controlled to be stored in the memory 840.

Meanwhile, the processor 87 is received AC current detection information from one solar module 50, or a plurality of solar modules 50a to 50n, or the string inverter 30 of FIGS. 1A to 1C. Through the second communication unit 82, it may be provided to an external server or an external electric device.

Accordingly, terminals such as the server 75, the notebook 60a, and the mobile terminal 60b, one solar module 50, or a plurality of solar modules 50a to 50n of FIGS. 1A to 1C Or, the AC current detection information from the string inverter 30 can be monitored.

In particular, it is possible to stably monitor the AC current detection information in real time.

First, FIG. 5A shows that the monitoring device 320 in the solar system 10b outputs AC current detection information, which is information on AC power from a plurality of external solar modules 50a to 50n, to the outside. Illustrate that.

In particular, FIG. 5A illustrates a path transmitted to the gateway 80 through power line communication.

For example, the AC current detection information may be output from the monitoring device 320 and transmitted to the gateway 80 through the distribution device 330 and through an AC power cable (ACC).

5B illustrates that at least some of the plurality of external photovoltaic modules 50a to 50n respectively output information on AC power.

In particular, FIG. 5B illustrates a path in which at least some of the plurality of external photovoltaic modules 50a to 50n are transmitted to the monitoring device 320 through power line communication or the like.

For example, AC current information from at least some of the plurality of external photovoltaic modules 50a to 50n may be transmitted to the monitoring device 320 through cables 31a to 31n of each photovoltaic module. .

Specifically, the first photovoltaic module 50a and the n-th photovoltaic module 50n may transmit each AC power information to the monitoring device 320 through power line communication via respective cables.

Meanwhile, the monitoring device 320 may obtain AC current detection information for the second solar module 50b through the current detection unit 322.

Accordingly, the monitoring device 320 receives information on the first solar module 50a and the n-th solar module 50n through the second communication unit 325, and receives the first communication unit 323 Through this, the AC current detection information for the second solar module 50b, which is transmitted to the gateway 80 and obtained through the current detection unit 322, may be transmitted to the gateway 80. Accordingly, it is possible to stably monitor different types of solar modules.

FIG. 5C illustrates that the gateway 80 transmits AC current detection information to the server 75 via a path1b, wired or wirelessly.

In addition, FIG. 5C illustrates that the gateway 80 transmits AC current detection information or the like to the server 75 via the AP device 70 via a path 1c, wired or wirelessly.

Accordingly, in the server 75, it is possible to stably monitor the AC current detection information of the solar module.

5D illustrates that the gateway 80 transmits AC current detection information, etc., to a terminal such as a notebook 60a or a mobile terminal 60b through a path1d, wired or wirelessly.

Accordingly, in a terminal such as the notebook 60a or the mobile terminal 60b, it is possible to stably monitor the AC current detection information for the solar module.

First, FIG. 6A illustrates that the monitoring device 320 in the solar system 10c outputs AC current detection information, which is information on AC power from an external string inverter 30, to the outside.

In particular, FIG. 6A illustrates a path transmitted to the gateway 80 through power line communication (path2a).

6B illustrates that the external string inverter 30 outputs information on AC power.

In particular, FIG. 6B illustrates a path 2o transmitted to the monitoring device 320 by the external string inverter 30 through power line communication or the like.

For example, the external string inverter 30 has a separate current detection unit (not shown), and the AC current information detected by the external string inverter 30 is transmitted to the monitoring device 320 through power line communication. Can be transmitted.

Accordingly, the monitoring device 320 may transmit the received AC current detection information for the external string inverter 30 to the gateway 80. Accordingly, it is possible to stably monitor the external string inverter 30.

Referring to the drawings, the junction box 200 may convert DC power from the solar cell module 100 and output the converted power.

In particular, in relation to the present invention, the junction box 200 may include a power conversion device 500 for outputting AC power.

To this end, the power conversion device 500 may include a converter 530, an inverter 540, and a control unit 550 for controlling the converter 530.

In addition, the power conversion device 500 may further include a bypass diode unit 510 for bypass, a capacitor unit 520 for storing DC power, and a filter unit 570 for filtering the output AC power. I can.

Meanwhile, the power conversion device 500 may further include a communication unit 580 for communicating with an external gateway 80.

Meanwhile, the power conversion device 500 includes an input current detector (A), an input voltage detector (B), a converter output current detector (C), a converter output voltage detector (D), an inverter output current detector (E), and an inverter output. A voltage detector (F) may be further provided.

Meanwhile, the controller 550 may control the converter 530, the inverter 540, and the communication unit 580.

The bypass diode unit 510 may include bypass diodes Dc, Db, and Da respectively disposed between the first to fourth conductive lines (not shown) of the solar cell module 100. . At this time, the number of bypass diodes is one or more, and it is preferable that one is smaller than the number of conductive lines.

The bypass diodes Dc, Db, and Da receive photovoltaic direct current power from the solar cell module 100, in particular, from the first to fourth conductive lines (not shown) in the solar cell module 100. In addition, the bypass diodes Dc, Db, and Da may be bypassed when a reverse voltage is generated from DC power from at least one of the first to fourth conductive lines (not shown).

Meanwhile, DC power passing through the bypass diode unit 510 may be input to the capacitor unit 520.

The capacitor unit 520 may store an input DC power input through the solar cell module 100 and the bypass diode unit 510.

On the other hand, in the drawing, the capacitor unit 520 is illustrated as having a plurality of capacitors (Ca, Cb, Cc) connected in parallel to each other. It is also possible to be connected to the stage. Alternatively, the capacitor unit 520 may have only one capacitor.

The converter 530 may convert the level of the input voltage from the solar cell module 100 through the bypass diode unit 510 and the capacitor unit 520.

In particular, the converter 530 may perform power conversion using DC power stored in the capacitor unit 520.

Meanwhile, switching elements in the converter 530 may be turned on/off based on a converter switching control signal from the controller 550. Accordingly, the level-converted DC power may be output.

The inverter 540 may convert DC power converted by the converter 530 into AC power.

In the drawing, a full-bridge inverter is illustrated. That is, the upper and lower arm switching elements (SW1, SW3) and lower arm switching elements (SW2, SW4) that are connected in series with each other become a pair, and a total of two pairs of upper and lower arm switching elements are parallel to each other (SW1, SW2, SW3, SW4). Leads to Diodes D1 to D4 may be connected in reverse parallel to each of the switching elements SW1 to SW4.

The switching elements SW1 to SW4 in the inverter 540 may be turned on/off based on an inverter switching control signal from the controller 550. Accordingly, AC power having a predetermined frequency can be output. Preferably, it is desirable to have the same frequency (about 60Hz or 50Hz) as the alternating current frequency of the grid.

Meanwhile, the capacitor C may be disposed between the converter 530 and the inverter 540.

The capacitor C may store the level-converted DC power of the converter 530. Meanwhile, both ends of the capacitor C may be referred to as a dc terminal, and accordingly, the capacitor C may be referred to as a dc terminal capacitor.

Meanwhile, the input current detection unit A may detect an input current ic1 supplied from the solar cell module 100 to the capacitor unit 520.

Meanwhile, the input voltage detector B may detect an input voltage Vc1 supplied from the solar cell module 100 to the capacitor unit 520. Here, the input voltage Vc1 may be the same as the voltage stored at both ends of the capacitor unit 520.

The detected input current ic1 and input voltage vc1 may be input to the controller 550.

On the other hand, the converter output current detection unit (C) detects the output current (ic2) output from the converter 530, that is, the dc end current, and the converter output voltage detection unit (D) is the output voltage output from the converter 530 (vc2), that is, detects the dc voltage. The detected output current ic2 and output voltage vc2 may be input to the control unit 550.

Meanwhile, the inverter output current detection unit E detects the current ic3 output from the inverter 540, and the inverter output voltage detection unit F detects the voltage vc3 output from the inverter 540. The detected current ic3 and voltage vc3 are input to the control unit 550.

Meanwhile, the controller 550 may output a control signal for controlling the switching elements of the converter 530. In particular, the control unit 550 is applied to at least one of the detected input current (ic1), input voltage (vc1), output current (ic2), output voltage (vc2), output current (ic3), or output voltage (vc3). Based on this, the turn-on timing signals of the switching elements in the converter 530 may be output.

Meanwhile, the controller 550 may output an inverter control signal or an inverter switching control signal Sic that controls each of the switching elements SW1 to SW4 of the inverter 540. In particular, the control unit 550 is applied to at least one of the detected input current (ic1), input voltage (vc1), output current (ic2), output voltage (vc2), output current (ic3), or output voltage (vc3). Based on this, a turn-on timing signal of each of the switching elements SW1 to SW4 of the inverter 540 may be output.

Meanwhile, the controller 550 may control the converter 530 to calculate a maximum power point for the solar cell module 100 and output DC power corresponding to the maximum power accordingly.

Meanwhile, the communication unit 580 may communicate with the gateway 80.

For example, the communication unit 580 may exchange data with the gateway 80 through power line communication.

Meanwhile, the communication unit 580 may transmit current information, voltage information, power information, and the like of the solar module 50 to the gateway 80.

Meanwhile, the filter unit 570 may be disposed at the output terminal of the inverter 540.

In addition, the filter unit 570 includes a plurality of passive elements, and based on at least some of the plurality of passive elements, the phase difference between the AC current io and the AC voltage vo output from the inverter 540 Can be used to adjust.

The monitoring device according to the present invention, and the solar system having the same, are not limited to the configuration and method of the embodiments described as described above, but the embodiments are All or some may be selectively combined and configured.

In addition, although the preferred embodiments of the present invention have been illustrated and described above, the present invention is not limited to the specific embodiments described above, and the technical field to which the present invention belongs without departing from the gist of the present invention claimed in the claims. In addition, various modifications are possible by those of ordinary skill in the art, and these modifications should not be individually understood from the technical spirit or prospect of the present invention.

The present invention is applicable to a monitoring device and a solar system having the same.

Claims

A processor for receiving AC current detection information from a current detector for detecting a current of AC power input from at least one external photovoltaic module;

A communication unit for transmitting the AC current detection information to an external gateway or server through a power line communication method;

And a power supply unit that includes a converter that converts AC power input from the outside into DC power, and supplies the converted DC power to the processor or the communication unit.
The method of claim 1,

The converter,

A monitoring device, characterized in that converting AC power from an external grid into the DC power.
The method of claim 1,

And a second communication unit configured to receive AC current information of at least some of the at least one external photovoltaic module by performing power line communication with at least a part of the at least one external photovoltaic module. Monitoring device.
The method of claim 3,

The processor,

When the AC current information is received through the second communication unit, at least one of the AC current detection information or the AC current information is controlled to be output to the outside through the communication unit.
The method of claim 3,

The processor,

When the AC current information is received through the second communication unit, final AC current information is calculated using the AC current detection information and the AC current information, and the calculated final AC current information is transmitted through the communication unit. , Monitoring device, characterized in that for controlling to output to the outside.
The method of claim 1,

When a circuit breaker for cutting off AC power is disposed between the at least one external photovoltaic module and the monitoring device,

The processor,

When the level of the AC current detection information is out of the allowable range, the monitoring device, characterized in that for controlling to output a control signal for turning off the breaker.
The method of claim 1,

And the current detection unit for detecting the current of the input AC power.
The method of claim 1,

The current detector is a monitoring device, characterized in that for detecting the current of the three-phase AC power supply.
The method of claim 1,

The current detection unit is a monitoring device, characterized in that for non-contact detection of the current of the input AC power.
The method of claim 1,

The monitoring device,

A monitoring device, characterized in that disposed in a distribution device to which AC power from an external grid is input and AC power from the external solar module is input.
A processor for receiving AC current detection information from a current detector for detecting a current of AC power input from an external string inverter;

A communication unit for transmitting the AC current detection information to an external gateway or server through a power line communication method;

And a power supply unit that includes a converter that converts AC power input from the outside into DC power, and supplies the converted DC power to the processor or the communication unit.
The method of claim 11,

The converter,

A monitoring device, characterized in that converting AC power from an external grid into the DC power.
The method of claim 11,

And a second communication unit configured to receive AC current information of the external string inverter by performing power line communication with the external string inverter.
The method of claim 13,

The processor,

When the AC current information is received through the second communication unit, at least one of the AC current detection information or the AC current information is controlled to be output to the outside through the communication unit.
The method of claim 13,

The processor,

When the AC current information is received through the second communication unit, final AC current information is calculated using the AC current detection information and the AC current information, and the calculated final AC current information is transmitted through the communication unit. , Monitoring device, characterized in that for controlling to output to the outside.
The method of claim 11,

When a circuit breaker for cutting off AC power is disposed between the external string inverter and the monitoring device,

The processor,

When the level of the AC current detection information is out of the allowable range, the monitoring device, characterized in that for controlling to output a control signal for turning off the breaker.
The method of claim 11,

And the current detection unit for detecting the current of the input AC power.
A solar system comprising the monitoring device of any one of claims 1 to 17.