KR101849527B1 - Remote monitoring system and the remote control method for photovoltaic power plant - Google Patents

Abstract

The present invention relates to a remote control system and a remote control method of a solar power plant, and more particularly, to a remote control system and a remote control method of a solar power plant, which are installed in a plurality of PV modules, A slave modem configured with a plurality of communication channels through a DC (+) power line, a DC (-) power line and an auxiliary line connected to the PV module fixed frame of each PV module; A main modem connected to a plurality of slave modems provided in the plurality of PV modules to collect power production data received from each slave modem and transmit the detected data to a main management server through wire / wireless communication; A power supply line for DC (+) power supply and DC (-) power supply line for receiving data from each of the slave modems, and an auxiliary line for channel 2 consisting of a DC (-) power supply line and an auxiliary line connected to the PV module fixed frame And a channel selection controller provided in the main modem to select any one channel having an excellent communication state by comparing the measured impedance value with a set reference impedance value.

Description

TECHNICAL FIELD The present invention relates to a remote control system and a remote control method for a photovoltaic power generation plant,

The present invention relates to a remote control system and a remote control method of a solar power plant, and more particularly, to a remote control system and a remote control method of a solar power plant, And more particularly, to a remote control system and a remote control method of a photovoltaic power generation plant in which communication channels are automatically switched in a direction of a high success rate so that remote control performance can be enhanced.

As the depletion of petroleum and other fossil energy and the importance of protecting the global environment become more and more important, research and commercialization of new and renewable energy are being carried out in earnest as the expectations for the development and utilization of new and renewable energy, .

Especially, the solar power generation field among the renewable energy field is most actively developed and commercialized.

Solar power generation technology is a clean technology that can produce electricity indefinitely from sunlight, and the installation of solar power plant is steadily increasing in Korea.

Such a solar power plant facility can be used for commercial purposes because it does not have a high building around it, it is easy to receive sunlight regardless of the season, and there is no shade due to the absence of tall trees nearby, It is installed on rooftop of building and is planning the efficient use of idle site.

In order to efficiently monitor and manage the photovoltaic power plants installed in remote locations, it is necessary for the photovoltaic power generation company or the manager Considering that it is difficult to visit the site from time to time, a remote monitoring and remote control system is installed so that it can manage and supervise the solar power plant facilities installed in the field and the electric power production in real time.

The main facilities of the solar power plant include a PV module that receives solar light and produces electricity through chemical change, an inverter that converts DC electricity generated from the PV module into AC power, which is a commercial power, A solar cell module fixing structure in which the solar cell is fixedly installed at a predetermined height from the ground surface so as to easily receive solar light; a control panel for controlling power generation, distribution and supply of electricity produced by the solar cell; A management server provided with a communication module for managing the control panel at a remote place to manage and maintain the photovoltaic power generation facility, and the like.

As described above, the solar power plant including various facilities is always exposed to the outside, and it is affected by the external environment so that the occurrence frequency of the failure is high. Especially, due to defects in components used in various devices, It is necessary.

Therefore, for the management of facilities of large-scale solar power plants and efficient monitoring of power generation, it is most important that the remote management system, especially the smooth communication between the site control panel and the management server, is first and foremost.

Generally, in a remote management system for a conventional solar power plant, a plurality of PV modules, in which electric power is produced, a distribution line in which electric power generated by each PV module is transmitted to the inverter or the control panel, The inverter that converts the power generated by the PV modules into commercial power and the control panel which manages the main devices in the field as a whole.

In order to remotely manage these main management objects, it is necessary to use a short distance wireless communication network or a DC power line for outputting electricity generated from each PV, and to use a wireless communication, a wired Internet communication network, or a power line communication .

In particular, when a communication channel using short-range wireless communication is used, there is a problem that the PV module installed in a solar power plant and its fixed structure act as a single shielding film and the success rate of wireless communication is significantly lower than that of a wired communication system. And it was difficult to effectively monitor and manage it.

- Patent Publication No. 10-2015-33469 (Laid-open date: 2015.04.01, entitled "Multichannel Measurement System of Photovoltaic Power Plant Applied with Radio Transmission Terminal Enclosure") - Patent Registration No. 10-1425022 (Registered on Apr. 24, 2014, title of invention: Integrated management system of photovoltaic device) - Patent Publication No. 10-2014-42840 (Laid-open date: 2014.04.07, entitled: PV remote monitoring system)

Disclosure of the Invention The present invention has been devised to solve the problem caused by a communication failure of a conventional remote control system of a solar power plant, and it is an object of the present invention to construct a plurality of communication channels between a PV module and a slave modem for monitoring the same, The present invention provides a remote control system and a remote control method for a solar power plant, which can reduce the inconvenience of management of a solar power plant due to a communication failure by making communication possible.

In order to achieve the above object, a remote control system of a solar power plant according to the present invention comprises a DC (+) power supply line, a DC (-) power supply line and an auxiliary line A slave modem configured to configure a plurality of communication channels to monitor a power state produced by each of the plurality of PV modules; A main modem connected to the plurality of slave modems for collecting power production data received from each slave modem and transmitting the detected data to the main management server through wire / wireless communication; A channel 1 or DC (-) power line consisting of a DC (+) power line and a DC (-) power line when receiving data from the plurality of slave modems and an angle And a channel selection control unit provided in the main modem for detecting an impedance value between the channel lines and comparing the measured impedance value with a set reference impedance value, A channel and an impedance storage unit for storing the impedance of each line obtained and received in the communication channel of the communication channel and the corresponding channel and the impedance of each channel stored in the channel and impedance storage unit are compared with a set reference impedance, And an impedance comparison unit for comparing the impedance obtained in each channel with the reference impedance (+) Power supply line and DC (-) power supply line when the impedance obtained from each channel is smaller than or equal to the reference impedance value, by sending a signal to the slave modem And a channel selection unit for transmitting a control signal so that a channel 1 composed of (-) power lines is selected.

delete

The slave modem further includes a plurality of relay switches for selectively opening and closing the channel 1 or the channel 2 according to a signal transmitted from the channel selection control unit.

According to another aspect of the present invention, there is provided a remote control method for a solar power plant, comprising: a slave modem connected to a plurality of communication channels to monitor power production status of each PV module, Detecting an impedance signal for each channel; Transmitting an impedance signal for each channel detected through the slave modem to a main modem communicating with a plurality of slave modems; Storing an impedance for each channel transmitted to the main modem in a channel selection control unit; Comparing the impedance of each channel stored in the channel selection controller with a set reference impedance to determine a difference between the reference impedance and the reference impedance; Selecting one channel having excellent communication performance through a channel selection unit according to a difference between the impedance for each channel and the reference impedance, and transmitting the selected channel information to each slave modem; And a communication channel setting step of operating a plurality of relay switches according to the channel selection information received by the slave modem to connect a relay switch for one channel having excellent communication performance and opening a relay switch for other remaining channels .

The remote control system and the remote control method of the solar power plant according to the present invention may be applied to a plurality of slave modems installed for monitoring a plurality of PV modules installed in a solar power plant, The remote control of the photovoltaic power generation plant can be performed more efficiently by making it possible to automatically detect a specific channel having a relatively good communication status and to enable communication, thereby reducing the difficulty of management due to the poor communication state.

FIG. 1 is a diagram illustrating the operation symmetry between a main modem and a slave modem for a remote control system of a solar power plant according to the present invention,
2 is a diagram illustrating a channel connection state in a slave modem in a remote control system of a solar power plant according to the present invention,
FIG. 3 is a flow chart for a process of measuring a communication channel on a slave modem side in a remote control system of a solar power plant according to the present invention,
4 is a flowchart illustrating an operation process of a remote control system of a solar power plant according to the present invention.

The present invention relates to a remote management system for a solar power plant, and more particularly, to a communication system for a slave modem installed for monitoring a PV module, including a DC (+) power supply line and a DC (- Frame is used as a communication channel to detect the impedance value of each channel line to enable communication with a channel having better communication performance, thereby enabling a remote control system to further enhance the remote management efficiency of the solar power plant to provide.

To this end, the present invention is installed in a plurality of PV modules that receive sunlight to produce electricity, and monitors the power generation state of each PV module in real time, such as a DC (+) power line, a DC A slave modem having a plurality of communication channels configured through a line and a PV module fixed frame; A main modem connected to the slave modem installed in the plurality of PV modules to collect power production data received from each slave modem and transmit the detected data to the main management server through wired / wireless communication; When receiving data from each of the slave modems, the impedance value for each line of the communication channel constituted by the DC (+) power supply line and the DC (-) power supply line or the communication channel composed of the DC (-) power supply line and the PV module fixed frame is An impedance comparator and an impedance comparator are connected to the main modem to select a communication channel having a superior communication state as a basic communication channel and to transmit a signal to the slave modem, And a channel selection control unit that is provided additionally.

In addition, each of the slave modems may include a relay capable of selecting one of a plurality of channels by receiving information on a channel having a superior performance, that is, an impedance value, by comparing impedance values of a plurality of communication channels in the main modem, .

In addition, the channel selection control unit included in the main modem stores the impedance values of the respective lines obtained from the plurality of channels, and when the impedance values of the detected channels are larger than the set reference impedance values, And the DC (-) power line is selected as the basic channel to control the relay switch to be connected, and if the impedance value on each line obtained from the plurality of channels is smaller than the set reference impedance value or equal to the reference value , The communication channel composed of the DC (-) power line and the PV module fixed frame is selected as the basic channel so that the relay switch is connected.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the main features of a remote control system of a solar power plant according to the present invention, with reference to the accompanying drawings. A detailed description thereof will be omitted.

FIG. 1 is a block diagram of a remote control system of a solar power plant according to the present invention. In FIG. 1, an operation configuration between a main modem 30 and a plurality of slave modems 20 to 23 is shown in a block diagram.

2 shows a simplified circuit diagram according to the communication channel connection state of the slave modem 20. As shown in FIG.

1, a remote control system for a solar power plant according to the present invention includes a plurality of PV modules 10 to 13 installed in a solar power plant to produce electricity, a plurality of PV modules 10 to 13, A plurality of slave modems 20 to 23 installed in each of the PV modules 10 to 13 and a plurality of slave modems 20 to 23 connected to each of the slave modems 20 to 23 by wire / Collects the operation status information on the PV modules 10 to 13 from the modems 20 to 23 and transmits them to a management server (not shown) and receives control commands from the management server to control the slave modems 20 to 23 And a main modem 30,

Particularly, the slave modems 20 to 23 provided in each of the plurality of PV modules 10 to 13 are respectively formed with a plurality of communication channels 10a to 13a with the plurality of PV modules 10 to 13 The data and information obtained from each of the PV modules 10 to 13 are transmitted to the main modem 30, and in particular, The impedance of the communication channel between the slave modems 10 to 13 and the slave modems 20 to 23 is detected and stored in the main server 30 to determine whether the communication state for the plurality of communication channels is correct.

The communication channels 10 to 13a formed between the PV modules 10 to 13 and the slave modems 20 to 23 are not composed of a single channel but have a plurality of channels. (Hereinafter referred to as "channel 1") using the (+) power line 5 and the DC (-) power line 6 and the DC (-) power line 6 and the fixed frame of the PV module It is configured to be able to monitor the PV module by using an additional channel (hereinafter, referred to as 'channel 2') using the auxiliary line 7.

The slave modems 20 to 23 which have detected the information on the plurality of PV modules 10 to 13, in particular, the inter-communication channel impedance, are transmitted to the main modem 30 through the coupler 27, A main control unit 31 for processing the received data and storing a control program and an impedance value for a communication channel of each of the received slave modems 20 to 23 so as to select a channel having an excellent communication state And a channel selection control unit 35.

The channel selection control unit 35 includes a channel and impedance storage unit 32 for storing channel information transmitted from each of the slave modems 20 and 23 and the impedance detected in each channel, And an impedance comparison unit (33) for comparing an impedance value of a communication channel of each slave modem stored in the impedance storage unit (32) with a reference impedance value set by a stored program, and an impedance comparison unit And a channel selector 34 for selecting one of the communication channels connected to the slave modems 20 to 23, which is excellent in communication state, based on the result of the comparison.

2 shows a configuration of a communication channel connected to the slave modem 20 and a circuit configuration between the slave modem 20 and the main modem 30. As shown in FIG.

2, the slave modem 20 is connected to a PV module (not shown) through a plurality of communication channels 10a to monitor the operation status of the PV module, Multiple channels are configured through three lines consisting of a DC (+) power line (5), a DC (-) power line (6) and an auxiliary line (7) do.

That is, a channel 1 composed of the DC (+) power supply line 5 and the DC (-) power supply line 6 of the PV module and a channel 1 composed of the DC (-) power supply line 6 and the auxiliary line 7 2, and is configured to monitor the PV module from each slave modem through two communication channels.

Each of the slave modems 20 to 23 is provided with one or more relay switches 25 capable of individually switching operations for the channel 1 and the channel 2 to control signals transmitted from the main modem 30 In this case, any one of the two channels is selected as a switching operation of the relay switch 25 to enable smooth communication between the PV module and the slave modem, and the communication between the slave modem 20 and the main modem 30 A coupler 27 is provided to smoothly transmit and receive data between the two modems.

On the other hand, FIG. 3 is a simplified flowchart showing the order in which the impedances of the communication channels detected by the slave modems 20 to 23 are transmitted to the main modem 30 and processed.

That is, the DC (+) power line 5 and DC (-) of the channel 1 set as the basic communication channel among the two communication channels constructed between the PV modules 10 to 13 and the slave modems 20 to 23, The impedance values between the power lines 6 are transmitted to the main modem 30 and stored in the assigned channels and the impedance storage unit 32. The stored impedance values are compared with the reference impedance through the impedance comparison unit 33 Judgment is made.

When the impedance detected by the PV module through the impedance comparator 33 is larger than the set reference impedance, the control signal of the channel selector 34 is transmitted to each of the slave modems 20 to 30, The relay switch connected to channel 1 is disconnected and the relay switch connected to channel 2 is connected to configure the communication channel so that the communication is smoothly performed.

Of course, when the impedance of the communication channel determined by the impedance comparison unit 33 is less than or equal to the set reference impedance, the channel 1, which is the basic communication channel, remains intact.

Also, the impedance on each line of the channel 2 is transmitted to the real-time main modem 30 in a state where communication is performed on the channel 2, and the above-described impedance storage, comparison and selection processes are repeatedly performed to maintain the communication channel of the channel 2 Otherwise, it is judged whether or not to change the communication channel to the channel 1. The relay switch is repeatedly operated with the channel having excellent communication performance so that excellent communication state is maintained at all times, so that the solar power station can be remotely managed easily.

On the other hand, in FIG. 4, a control method for the remote control system of the above-described solar power plant is shown by a simple flowchart.

As shown in the figure, a control method for a remote control system of a solar power plant according to the present invention includes a slave modem connected to a plurality of communication channels to monitor power production status of each PV module, (S1) of detecting an impedance signal for each channel through the slave modem; S2) transmitting an impedance signal for each channel detected by the slave modem to a main modem communicating with a plurality of slave modems; (S3) of storing the impedance of each channel transmitted to the main modem in the channel selection control unit; comparing the impedance of each channel stored in the channel selection control unit with the set reference impedance to discriminate a difference between the reference impedance and the reference impedance ) And a channel having a superior communication performance through a channel selector according to the difference between the impedance for each channel and the reference impedance (S5) for transmitting the selected channel information to each slave modem; and a relay switch for one channel having excellent communication performance by operating a plurality of relay switches according to the channel selection information received by the slave modem And a communication channel setting step (S6) for connecting the other channels and opening a relay switch for the other remaining channels.

Of course, the steps S1 to S6 are performed in real time repeatedly (S7), and it is possible to change or maintain any one of a plurality of channels formed in the slave modem at any time while monitoring the communication channel state in which communication is currently performed do.

5: DC (+) power line 6: DC (-) power line
7: Booth line
10 to 13: PV module 10a to 13a: communication channel
20 to 23: Slave modem 25: Relay switch
27: Coupler
30: Main modem
31: main control unit 32: channel and impedance storage unit
33: Impedance comparison unit 34: Channel selection unit
35: Channel selection control unit

Claims (4)

delete A plurality of communication channels are formed through the DC (+) power line, the DC (-) power line and the auxiliary line connected to the PV module fixed frame, which are provided in each of the plurality of PV modules, A slave modem to monitor; A main modem connected to the plurality of slave modems for collecting power production data received from each slave modem and transmitting the detected data to the main management server through wire / wireless communication; A channel 1 or DC (-) power line consisting of a DC (+) power line and a DC (-) power line when receiving data from the plurality of slave modems and an angle And a channel selection controller provided in the main modem for detecting an impedance value between the channel lines and comparing the measured impedance value with a set reference impedance value to select any one channel having an excellent communication state,
The channel selection control unit,
A channel and impedance storage unit for storing an impedance on each line obtained and received in a plurality of communication channels and a corresponding channel;
An impedance comparison unit for comparing the impedance of each channel stored in the channel and impedance storage unit with the set reference impedance,
When the impedance obtained in each channel is greater than the reference impedance through the impedance comparison unit, a signal is sent to the slave modem to select a channel 2 composed of a DC (-) power supply line and an auxiliary line, and the impedance And a channel selection unit for transmitting a control signal so that a channel 1 composed of a DC (+) power supply line and a DC (-) power supply line is selected if the reference impedance value is less than or equal to the reference impedance value. Remote control system. 3. The method of claim 2,
Wherein the slave modem further includes a plurality of relay switches for selectively opening and closing the channel 1 or the channel 2 according to a signal transmitted from the channel selection control unit. Detecting an impedance signal for each channel through a slave modem connected to a plurality of communication channels so as to monitor the power production state of each PV module in real time;
Transmitting an impedance signal for each channel detected through the slave modem to a main modem communicating with a plurality of slave modems;
Storing an impedance for each channel transmitted to the main modem in a channel selection control unit;
Comparing the impedance of each channel stored in the channel selection controller with a set reference impedance to determine a difference between the reference impedance and the reference impedance;
Selecting one channel having excellent communication performance through a channel selection unit according to a difference between the impedance for each channel and the reference impedance, and transmitting the selected channel information to each slave modem;
And a communication channel setting step of operating a plurality of relay switches according to the channel selection information received by the slave modem to connect a relay switch for one channel having excellent communication performance and opening a relay switch for other remaining channels And the remote control method of the solar power plant remote control system.

Images