CN113315467A - Photovoltaic power station direct current carrier communication system - Google Patents

Photovoltaic power station direct current carrier communication system Download PDF

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Publication number
CN113315467A
CN113315467A CN202110480517.5A CN202110480517A CN113315467A CN 113315467 A CN113315467 A CN 113315467A CN 202110480517 A CN202110480517 A CN 202110480517A CN 113315467 A CN113315467 A CN 113315467A
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CN
China
Prior art keywords
direct current
current carrier
communication system
network terminator
photovoltaic power
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Pending
Application number
CN202110480517.5A
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Chinese (zh)
Inventor
陈军
杨志勇
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SHENZHEN TUOBANG AUTOMATION TECHNOLOGY Co.,Ltd.
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Shenzhen Topband Co Ltd
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Priority to CN202110480517.5A priority Critical patent/CN113315467A/en
Publication of CN113315467A publication Critical patent/CN113315467A/en
Pending legal-status Critical Current

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02S—GENERATION OF ELECTRIC POWER BY CONVERSION OF INFRARED RADIATION, VISIBLE LIGHT OR ULTRAVIOLET LIGHT, e.g. USING PHOTOVOLTAIC [PV] MODULES
    • H02S50/00—Monitoring or testing of PV systems, e.g. load balancing or fault identification
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
    • H02J13/00002—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by monitoring
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
    • H02J13/00006—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment
    • H02J13/00007—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment using the power network as support for the transmission
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
    • H02J13/00032—Systems characterised by the controlled or operated power network elements or equipment, the power network elements or equipment not otherwise provided for
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02S—GENERATION OF ELECTRIC POWER BY CONVERSION OF INFRARED RADIATION, VISIBLE LIGHT OR ULTRAVIOLET LIGHT, e.g. USING PHOTOVOLTAIC [PV] MODULES
    • H02S40/00—Components or accessories in combination with PV modules, not provided for in groups H02S10/00 - H02S30/00
    • H02S40/30—Electrical components
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B3/00—Line transmission systems
    • H04B3/54—Systems for transmission via power distribution lines
    • H04B3/548—Systems for transmission via power distribution lines the power on the line being DC
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/50—Photovoltaic [PV] energy
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
    • Y04S40/00—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them
    • Y04S40/12—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment
    • Y04S40/121—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment using the power network as support for the transmission

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Remote Monitoring And Control Of Power-Distribution Networks (AREA)

Abstract

The invention relates to a direct current carrier communication system of a photovoltaic power station. Each confluence monitoring module in the system is correspondingly arranged on one solar power generation panel to acquire monitoring data of the solar power generation panel; the first network terminator is connected with the second network terminator through the trunk cable, and the first network terminator and the second network terminator provide direct current for the trunk cable; each convergence monitoring module is connected to a trunk cable through a branch cable, and the first network terminator and the second network terminator provide electric energy for all the convergence monitoring modules through the trunk cable and the branch cable; each confluence monitoring module modulates the monitoring data into a direct current carrier signal, and transmits the direct current carrier signal to a trunk cable through a branch cable for transmission. According to the invention, the monitoring data of each solar panel is modulated onto the direct current power supply line by using a direct current carrier technology, communication and power supply requirements can be realized by only one set of line, the construction difficulty is reduced, and the construction cost is reduced.

Description

Photovoltaic power station direct current carrier communication system
Technical Field
The invention relates to the field of photovoltaic power stations, in particular to a direct-current carrier communication system of a photovoltaic power station.
Background
In a photovoltaic solar power station, a plurality of confluence monitoring modules are usually needed to monitor key information such as the generating current, the confluence voltage and the alarm state of a photovoltaic solar panel at any time so as to ensure the normal operation of the power station. In the prior art, the photovoltaic confluence monitoring modules are grouped and connected in series by an RS485 bus, and then are communicated with a local upper computer through an industrial standard MODBUS-RTU communication protocol. It can be understood that the photovoltaic confluence monitoring module is an electronic component, and can work only when power is supplied. At present, two schemes for supplying power to the photovoltaic confluence monitoring module are provided:
the first scheme is as follows: the photovoltaic converges and monitors embedded power module of module, directly gets the high-tension electricity of change from solar panel and turns into stable low pressure operating voltage, just this needs set up a high pressure on every solar panel and changes voltage circuit, and the cost is higher.
The second scheme is as follows: the photovoltaic confluence monitoring module is powered by an external connection power supply line, and the mode generally provides stable low-voltage working voltage directly without conversion power supply. For example, a plurality of photovoltaic bus monitoring modules are powered by one power source. This approach requires separate wiring, and is costly given that solar power plants are often remote, that adjacent modules are distributed widely, and that the distance between two modules varies from 50 meters to 1000 meters.
Therefore, in the prior art, the communication line and the power supply line of the convergence monitoring module are independent from each other, and two sets of systems are needed to work, so that the construction difficulty and the construction cost are increased.
Disclosure of Invention
The technical problem to be solved by the present invention is to provide a dc carrier communication system for a photovoltaic power station, aiming at the above-mentioned defects in the prior art.
The technical scheme adopted by the invention for solving the technical problems is as follows: constructing a photovoltaic power station direct current carrier communication system, wherein the photovoltaic power station comprises at least two solar power generation panels, the photovoltaic power station direct current carrier communication system comprises a first network terminator, a second network terminator and at least two convergence monitoring modules, and each convergence monitoring module is correspondingly installed on one solar power generation panel to acquire monitoring data of the solar power generation panel;
the first network terminator is connected with the second network terminator through a trunk cable, and the first network terminator and the second network terminator provide direct current for the trunk cable; each convergence monitoring module is connected to the trunk cable through a branch cable, and the first network terminator and the second network terminator provide electric energy for all the convergence monitoring modules through the trunk cable and the branch cable; and each convergence monitoring module modulates the monitoring data into a direct current carrier signal, and transmits the direct current carrier signal to the trunk cable through the branch cable for transmission.
Further, in the dc carrier communication system of the photovoltaic power station of the present invention, the confluence monitoring module includes a first power supply circuit and a signal modulation circuit, and the first power supply circuit supplies power to the confluence monitoring module; the signal modulation circuit is connected with a signal acquisition module of the solar power generation panel and is used for modulating the monitoring data acquired by the signal acquisition module into direct current carrier signals.
Further, in the dc carrier communication system of the photovoltaic power station of the present invention, a working time slot of each convergence monitoring module is preset, and the convergence monitoring module sends a dc carrier signal in the corresponding working time slot.
Further, the photovoltaic power station direct current carrier communication system further comprises an upper computer, wherein the upper computer is connected with the trunk cable through a branch cable, and receives the direct current carrier signal on the trunk cable.
Further, the photovoltaic power station direct current carrier communication system further comprises an upper computer, the upper computer is connected with one of the confluence monitoring modules, and the upper computer receives the direct current carrier signals of all the confluence monitoring modules through the confluence monitoring modules.
Further, in the dc carrier communication system of the photovoltaic power station of the present invention, the upper computer identifies the sink monitoring module corresponding to the received dc carrier signal according to a pre-stored correspondence between the working time slot and the sink monitoring module.
Further, in the dc carrier communication system of the photovoltaic power plant of the present invention, the upper computer includes a signal demodulation circuit, and the signal demodulation circuit is configured to demodulate the dc carrier signal to obtain the monitoring data of each of the confluence monitoring modules.
Further, in the dc carrier communication system of the photovoltaic power station, the upper computer determines whether the monitoring data is abnormal, and if the monitoring data is abnormal, determines the abnormal convergence monitoring module and sends alarm information, where the alarm information includes abnormal parameters of the abnormal convergence monitoring module and the abnormal convergence monitoring module.
Further, in the dc carrier communication system of the photovoltaic power plant of the present invention, after all the convergence monitoring modules complete one cycle of transmission, the first network terminator or the second network terminator transmits a time reset signal, and all the convergence monitoring modules reset the time.
Further, in the dc carrier communication system of the photovoltaic power plant of the present invention, the first network terminator is connected to the trunk cable through a first filter; and/or
And the second network terminator is connected with the trunk cable through a second filter.
The photovoltaic power station direct current carrier communication system has the following beneficial effects: according to the invention, the monitoring data of each solar panel is modulated onto the direct current power supply line by using a direct current carrier technology, communication and power supply requirements can be realized by only one set of line, the construction difficulty is reduced, and the construction cost is reduced.
Drawings
The invention will be further described with reference to the accompanying drawings and examples, in which:
fig. 1 is a schematic structural diagram of a dc carrier communication system of a photovoltaic power plant according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a dc carrier communication system of a photovoltaic power plant according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a dc carrier communication system of a photovoltaic power plant according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a dc carrier communication system of a photovoltaic power plant according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of a dc carrier communication system of a photovoltaic power plant according to an embodiment of the present invention.
Detailed Description
For a more clear understanding of the technical features, objects and effects of the present invention, embodiments of the present invention will now be described in detail with reference to the accompanying drawings.
In a preferred embodiment, referring to fig. 1, the dc carrier communication system of a photovoltaic power generation station of this embodiment is applied to a photovoltaic power generation station, and the photovoltaic power generation station includes at least two solar power generation panels. The photovoltaic power station direct current carrier communication system comprises a first network terminator 10, a second network terminator 20 and at least two convergence monitoring modules 30, wherein each convergence monitoring module 30 is correspondingly installed on one solar power generation panel to acquire monitoring data of the solar power generation panel. The first network terminator 10 is connected to the second network terminator 20 through a trunk cable, and the first network terminator 10 and the second network terminator 20 provide direct current for the trunk cable. Each of the bus monitoring modules 30 is connected to a trunk cable by a branch cable, and the first network terminator 10 and the second network terminator 20 supply power to all the bus monitoring modules 30 through the trunk cable and the branch cable. Each of the bus monitoring modules 30 modulates the monitoring data into a dc carrier signal, and transmits the dc carrier signal to the trunk cable via the branch cable.
This embodiment uses direct current carrier wave technique to modulate every solar panel's monitoring data on the direct current power supply line, only needs one set of circuit can realize communication and power supply demand, reduces the construction degree of difficulty and reduces the construction cost simultaneously.
In the photovoltaic power plant dc carrier communication system of some embodiments, referring to fig. 2, the bus monitoring module 30 of this embodiment includes a first power supply circuit 301 and a signal modulation circuit 302, where the first power supply circuit 301 supplies power to the bus monitoring module 30, the signal modulation circuit 302 is connected to the signal acquisition module 40 of the solar power generation panel, and the first power supply circuit 301 also supplies power to the signal acquisition module 40. The signal modulation circuit 302 is configured to modulate the monitoring data acquired by the signal acquisition module 40 into a dc carrier signal, where the monitoring data is various parameters of the solar panel, including but not limited to a power generation current, a power generation voltage, a solar panel inclination angle, a temperature, a humidity, and a illuminance. Alternatively, the signal acquisition module 40 includes, but is not limited to, a generated current acquisition circuit, a generated voltage acquisition circuit, a slope detection circuit, a light sensor, a temperature sensor, a humidity sensor, a wind speed sensor, and the like. The direct current used in this embodiment can provide direct current for the convergence monitoring module 30, and simultaneously modulate the monitoring data into a direct current carrier signal, so that one cable can simultaneously meet the power supply and communication requirements.
In the dc carrier communication system of the photovoltaic power station in some embodiments, a working time slot of each convergence monitoring module 30 is preset, and the convergence monitoring module 30 sends a dc carrier signal in the corresponding working time slot, so that the dc carrier signal of each convergence monitoring module 30 corresponds to the working time slot one to one, and the convergence monitoring module 30 to which the dc carrier signal received in a certain working time slot belongs can be determined according to the corresponding relationship. Alternatively, to ensure that the working time slots of all the bus monitoring modules 30 are consistent, after all the bus monitoring modules 30 complete one cycle of transmission, the first network terminator 10 or the second network terminator 20 transmits a time reset signal, and all the bus monitoring modules 30 reset the time. The time is reset in each emission period, so that the clocks of all the convergence monitoring modules 30 can be kept consistent, and the working time slots of all the convergence monitoring modules 30 are accurate.
Referring to fig. 3, the photovoltaic power plant dc carrier communication system of some embodiments further includes an upper computer 50, the upper computer 50 is connected to the trunk cable through a branch cable, and the upper computer 50 receives a dc carrier signal on the trunk cable. The upper computer 50 includes a signal demodulation circuit 501, and the signal demodulation circuit 501 is configured to demodulate the dc carrier signal to obtain monitoring data of each of the confluence monitoring modules 30. The upper computer 50 identifies the convergence monitoring module 30 corresponding to the received dc carrier signal according to the pre-stored corresponding relationship between the working time slot and the convergence monitoring module 30, that is, the dc carrier signal of each convergence monitoring module 30 corresponds to the working time slot one by one, and the upper computer 50 can determine the convergence monitoring module 30 to which the received dc carrier signal belongs according to the time slot. The upper computer 50 of the present embodiment can receive, demodulate, and identify the dc carrier signal, thereby obtaining the monitoring data of each of the convergence monitoring modules 30.
Referring to fig. 4, the photovoltaic power plant dc carrier communication system of some embodiments further includes an upper computer 50, the upper computer 50 is connected to one of the confluence monitoring modules 30, and the upper computer 50 receives dc carrier signals of all of the confluence monitoring modules 30 through the confluence monitoring modules 30. In the photovoltaic power station direct current carrier communication system, each confluence monitoring module 30 can receive direct current carrier signals sent by all other confluence monitoring modules 30, and the upper computer 50 can receive the direct current carrier signals sent by all confluence monitoring modules 30 through the confluence monitoring modules 30. The upper computer 50 includes a signal demodulation circuit 501, and the signal demodulation circuit 501 is configured to demodulate the dc carrier signal to obtain monitoring data of each of the confluence monitoring modules 30. The upper computer 50 identifies the convergence monitoring module 30 corresponding to the received dc carrier signal according to the pre-stored corresponding relationship between the working time slot and the convergence monitoring module 30, that is, the dc carrier signal of each convergence monitoring module 30 corresponds to the working time slot one by one, and the upper computer 50 can determine the convergence monitoring module 30 to which the received dc carrier signal belongs according to the time slot. The upper computer 50 of the present embodiment can receive, demodulate, and identify the dc carrier signal, thereby obtaining the monitoring data of each of the convergence monitoring modules 30.
In the dc carrier communication system of the photovoltaic power station according to some embodiments, the upper computer 50 determines whether the monitoring data is abnormal, and if the monitoring data is abnormal, determines the abnormal junction monitoring module 30 and sends alarm information, where the alarm information includes abnormal parameters of the abnormal junction monitoring module 30 and the abnormal junction monitoring module 30. Alternatively, the alarm information may be a sound alarm, a light alarm, or a display screen displaying alarm information. According to the embodiment, abnormal data are automatically displayed by analyzing the monitoring data, and the management efficiency of the photovoltaic power station is improved.
In the photovoltaic power plant dc carrier communication system of some embodiments, referring to fig. 5, the first network terminator 10 is connected to the trunk cable through a first filter 601, and the first filter 601 is configured to filter an abnormal signal in the trunk circuit, so as to avoid interfering an external signal from entering the trunk current to affect the dc carrier signal.
In the photovoltaic power plant dc carrier communication system of some embodiments, referring to fig. 5, the second network terminator 20 is connected to the trunk cable through a second filter 602, and the second filter 602 is configured to filter an abnormal signal in the trunk circuit, so as to avoid interfering an external signal into the trunk current to affect the dc carrier signal.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description.
Those of skill would further appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both, and that the various illustrative components and steps have been described above generally in terms of their functionality in order to clearly illustrate this interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
The steps of a method or algorithm described in connection with the embodiments disclosed herein may be embodied directly in hardware, in a software module executed by a processor, or in a combination of the two. A software module may reside in Random Access Memory (RAM), memory, Read Only Memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art.
The above embodiments are merely illustrative of the technical ideas and features of the present invention, and are intended to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and not to limit the scope of the present invention. All equivalent changes and modifications made within the scope of the claims of the present invention should be covered by the claims of the present invention.

Claims (10)

1. A photovoltaic power station direct current carrier communication system comprises at least two solar power generation panels, and is characterized in that the photovoltaic power station direct current carrier communication system comprises a first network terminator (10), a second network terminator (20) and at least two convergence monitoring modules (30), wherein each convergence monitoring module (30) is correspondingly installed on one solar power generation panel to acquire monitoring data of the solar power generation panel;
the first network terminator (10) is connected with the second network terminator (20) through a trunk cable, and the first network terminator (10) and the second network terminator (20) provide direct current for the trunk cable; each of the bus monitoring modules (30) is connected to the trunk cable by a branch cable, and the first network terminator (10) and the second network terminator (20) supply electric energy to all the bus monitoring modules (30) through the trunk cable and the branch cable; each convergence monitoring module (30) modulates the monitoring data into a direct current carrier signal, and transmits the direct current carrier signal to the trunk cable through the branch cable.
2. The photovoltaic power plant direct current carrier communication system according to claim 1, characterized in that the bus monitoring module (30) comprises a first power supply circuit (301) and a signal modulation circuit (302), the first power supply circuit (301) supplying power to the bus monitoring module (30); the signal modulation circuit (302) is connected with the signal acquisition module (40) of the solar power generation panel and is used for modulating the monitoring data acquired by the signal acquisition module (40) into direct current carrier signals.
3. The photovoltaic power plant direct current carrier communication system according to claim 1, characterized in that an operating time slot of each of the confluence monitoring modules (30) is preset, and the confluence monitoring modules (30) transmit direct current carrier signals in their corresponding operating time slots.
4. The photovoltaic power plant direct current carrier communication system according to claim 1, further comprising an upper computer (50), wherein the upper computer (50) is connected with the trunk cable through a branch cable, and the upper computer (50) receives the direct current carrier signal on the trunk cable.
5. The photovoltaic power plant direct current carrier communication system according to claim 1, further comprising an upper computer (50), wherein the upper computer (50) is connected with one of the confluence monitoring modules (30), and the upper computer (50) receives the direct current carrier signals of all the confluence monitoring modules (30) through the confluence monitoring modules (30).
6. The photovoltaic power plant direct current carrier communication system according to claim 4 or 5, wherein the upper computer (50) identifies the conflux monitoring module (30) corresponding to the received direct current carrier signal according to a pre-stored correspondence relationship between an operating time slot and the conflux monitoring module.
7. The photovoltaic power plant direct current carrier communication system according to claim 6, characterized in that the upper computer (50) comprises a signal demodulation circuit (501), and the signal demodulation circuit (501) is used for demodulating the direct current carrier signal to obtain monitoring data of each of the confluence monitoring modules (30).
8. The photovoltaic power plant direct current carrier communication system according to claim 7, wherein the upper computer (50) judges whether the monitoring data is abnormal, if so, determines an abnormal confluence monitoring module (30) and sends alarm information, and the alarm information includes abnormal parameters of the abnormal confluence monitoring module (30) and the abnormal confluence monitoring module (30).
9. The photovoltaic power plant direct current carrier communication system according to claim 1, characterized in that after all the bus monitoring modules (30) complete one cycle transmission, the first network terminator (10) or the second network terminator (20) transmits a time reset signal, and all the bus monitoring modules (30) reset the time.
10. The photovoltaic power plant direct current carrier communication system according to claim 1, characterized in that the first network terminator (10) is connected to the trunk cable through a first filter (601); and/or
The second network terminator (20) is connected to the trunk cable via a second filter (602).
CN202110480517.5A 2021-04-30 2021-04-30 Photovoltaic power station direct current carrier communication system Pending CN113315467A (en)

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JP2012205078A (en) * 2011-03-25 2012-10-22 Sumitomo Electric Ind Ltd Monitoring system for photovoltaic power generation
US20180287557A1 (en) * 2015-11-02 2018-10-04 Gree Electric Appliances, Inc. Of Zhuhai Method, Apparatus, and System for Detecting Working State of Photovoltaic Panel, and Photovoltaic Electrical System
CN105429834A (en) * 2015-11-09 2016-03-23 浙江大学 Smoke control and exhaust monitoring system based on 24V DC power line carrier communication
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CN209134411U (en) * 2018-12-25 2019-07-19 上海三思电子工程有限公司 Wisdom equipment
CN210157188U (en) * 2019-07-29 2020-03-17 深圳市晟瑞科技有限公司 Two-wire power supply communication system based on intelligent equipment

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