CN112437103A - Intelligent photovoltaic junction box monitoring system - Google Patents
Intelligent photovoltaic junction box monitoring system Download PDFInfo
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- H04L67/00—Network arrangements or protocols for supporting network services or applications
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- H04L67/025—Protocols based on web technology, e.g. hypertext transfer protocol [HTTP] for remote control or remote monitoring of applications
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- G08B21/00—Alarms responsive to a single specified undesired or abnormal condition and not otherwise provided for
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- G08B21/185—Electrical failure alarms
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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
- H02S40/00—Components or accessories in combination with PV modules, not provided for in groups H02S10/00 - H02S30/00
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- H02S40/34—Electrical components comprising specially adapted electrical connection means to be structurally associated with the PV module, e.g. junction boxes
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Abstract
The application provides an intelligence photovoltaic terminal box monitored control system for improve photovoltaic system's reliability and stability. The method comprises the following steps: at least one junction box, each junction box of the at least one junction box being connected to one photovoltaic panel; each junction box is used for collecting working state parameters of the connected photovoltaic panels; the gateway is used for receiving the working state parameters of the photovoltaic panel connected with each junction box and sent by each junction box to obtain a working state parameter set; and the control end is used for receiving the working state parameter set sent by the gateway and determining whether to disconnect the relays of part or all of the junction boxes in the at least one junction box according to the working state parameter set so as to cut off the connection between each photovoltaic panel.
Description
Technical Field
The application relates to the technical field of photovoltaic power generation, in particular to an intelligent photovoltaic junction box monitoring system.
Background
Energy structures based on conventional energy sources (e.g., coal, oil, natural gas, etc.) will become less and less suitable for sustainable development as resources are continuously consumed. For the sustainable development, photovoltaic power generation products become more and more popular around the world, and the development and utilization of renewable energy mainly based on solar energy has become a consensus of people. Photovoltaic power generation systems can directly convert solar energy into high-quality electrical energy. The intelligentization of the photovoltaic power generation system is developed into one of the core concerns of global technical innovation.
The most important device of photovoltaic power generation is a photovoltaic module, and the quality and reliability of a photovoltaic panel directly determine the reliability and stability of the whole photovoltaic power generation. In a conventional photovoltaic power generation system, a junction box is generally connected to an output end of a photovoltaic panel, a bypass diode is arranged inside the junction box, and the bypass diode is reversely connected to two ends of a string of battery pieces. Since the cells are connected in series, the total voltage can reach 1KV (kilovolt). Therefore, when the photovoltaic power generation system encounters a disaster, even if the bus loop switch is disconnected, namely the bypass diode at the output end of the photovoltaic panel is disconnected, the high voltage of the photovoltaic power generation system to the ground still exists, so that the whole photovoltaic power generation system is very dangerous.
Disclosure of Invention
The embodiment of the application provides an intelligent photovoltaic junction box monitoring system, which is used for providing reliability and stability of a photovoltaic system.
In a first aspect, the present application provides an intelligent photovoltaic junction box monitoring system, comprising:
at least one junction box, each junction box of the at least one junction box being connected to one photovoltaic panel; each junction box is used for collecting working state parameters of the connected photovoltaic panels;
the gateway is used for receiving the working state parameters of the photovoltaic panel connected with each junction box and sent by each junction box to obtain a working state parameter set;
and the control end is used for receiving the working state parameter set sent by the gateway and determining whether to disconnect the relays of part or all of the junction boxes in the at least one junction box according to the working state parameter set so as to cut off the connection between each photovoltaic panel.
In the embodiment of the application, each junction box in at least one junction box can collect the working state parameters of the connected photovoltaic panels, and the collected working state parameters are transmitted to the control end through the gateway, so that the working state parameter set received by the control end can determine whether to disconnect part or all relays in at least one junction box to cut off the connection between each photovoltaic panel, the failure of the whole photovoltaic system caused by the abnormality of one photovoltaic panel is avoided, and the reliability and the stability of the photovoltaic system can be improved.
In one possible design, when each junction box collects operating state parameters of the connected photovoltaic panel, the method is specifically configured to:
collecting working state parameters of the connected photovoltaic panels according to a preset period; or
When first indication information sent by the gateway is received, collecting working state parameters of the connected photovoltaic panel; the first indication information is used for indicating each junction box to collect working state parameters of the connected photovoltaic panels.
In this embodiment of the application, each junction box may collect working state parameters of the connected photovoltaic panel according to a preset period, or may collect working state parameters of the connected photovoltaic panel according to first indication information sent by the gateway, or collect working state parameters of the connected photovoltaic panel in other manners.
In a possible design, when each junction box receives first indication information sent by the gateway and collects working state parameters of the connected photovoltaic panel, the method is specifically configured to:
judging whether the node address carried in the first indication information is the node address of the photovoltaic panel connected with each junction box;
if yes, collecting the working state parameters of the connected photovoltaic panel.
In the embodiment of the application, when each junction box receives first indication information sent by a gateway, whether a node address carried in the first indication information is a node address of a photovoltaic panel connected with the junction box is judged, and if yes, the working state parameters of the photovoltaic panel are collected, so that system resources are not wasted.
In one possible design, the operating condition parameter is temperature;
each junction box is further configured to:
judging whether the temperature is higher than a preset temperature or not;
if yes, the relay in each junction box is disconnected.
In this application embodiment, the terminal box can also judge whether the temperature of gathering is higher than preset temperature after gathering the temperature of the photovoltaic panel who connects, when being higher than preset temperature, the relay in every terminal box of control is in the off-state, avoids producing the conflagration because of the high temperature to can improve photovoltaic system's reliability and stability.
In a possible design, when the control end determines whether to open the relay in each junction box according to the working state parameter set so as to cut off the connection between each photovoltaic panel, the control end is specifically configured to:
the control end judges whether the photovoltaic panel connected with each junction box is abnormal or not according to the working state parameter set;
if the abnormal photovoltaic panel occurs, the control end sends second indication information to the gateway to indicate the gateway to inform the junction box of the photovoltaic panel string where the abnormal photovoltaic panel is located of disconnecting the relay; wherein, the working state parameter of the photovoltaic panel connected with each junction box is any one or more of current, voltage or power of the photovoltaic panel.
In the embodiment of the application, the control end can judge whether the photovoltaic panel connected with each junction box is abnormal or not according to the working state parameter set, and if the photovoltaic panel connected with each junction box is abnormal, second indication information is sent to the gateway to indicate the gateway to inform the junction box of the photovoltaic panel string where the abnormal photovoltaic panel is located to disconnect the relay, so that remote monitoring is achieved.
In one possible design, the control terminal is further configured to:
and outputting prompt information to prompt the photovoltaic panel to be abnormal.
In the embodiment of the application, when the photovoltaic panel is abnormal, the control end can output prompt information to prompt a worker to process the abnormal photovoltaic panel. In the embodiment of the application, the control end may output the prompt information through voice, or output the prompt information through a display unit of the control end, or send the prompt information to an electronic device connected to the control end, for example, send an alarm short message to a mobile terminal connected to the control end.
In one possible design, the control terminal is further configured to:
displaying a topological graph of a photovoltaic panel connected with the at least one junction box on a display unit of the control end;
when the photovoltaic panel is abnormal, prompt information is output on the topological graph corresponding to the position of the abnormal photovoltaic panel.
In the embodiment of the application, the topological graph of the photovoltaic panel is displayed on the display unit of the control end, so that when the photovoltaic panel is abnormal, prompt information can be output on the topological graph corresponding to the position of the abnormal photovoltaic panel, and therefore a worker can accurately position the abnormal photovoltaic panel. Or the photovoltaic panel in which the abnormality occurs is displayed in a highlighted form, for example, in a different color from that of a normal photovoltaic panel.
In one possible design of the system,
each junction box sends the working state parameters to a gateway in a short-distance wireless communication or broadband power carrier communication mode;
and the gateway sends the working state parameter set to the control end in a wireless communication mode or a broadband power carrier communication mode.
In the embodiment of the present application, the communication mode between each junction box and the gateway may be short-distance wireless communication or broadband power carrier communication, and the communication mode between the gateway and the control end may be wireless communication or broadband power carrier communication, or other modes.
In the embodiment of the application, each junction box in at least one junction box can collect the working state parameters of the connected photovoltaic panels, and the collected working state parameters are transmitted to the control end through the gateway, so that the working state parameter set received by the control end can determine whether to disconnect part or all relays in at least one junction box to cut off the connection between each photovoltaic panel, the failure of the whole photovoltaic system caused by the abnormality of one photovoltaic panel is avoided, and the reliability and the stability of the photovoltaic system can be improved.
Drawings
Fig. 1 is a schematic diagram of an intelligent photovoltaic junction box monitoring system according to an embodiment of the present disclosure;
FIG. 2 is a schematic structural view of a junction box provided herein;
fig. 3 is a schematic structural diagram of a gateway provided in the present application;
fig. 4 is a topological diagram of a photovoltaic panel provided in the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be described below with reference to the drawings in the embodiments of the present application.
Hereinafter, some terms in the embodiments of the present application are explained to facilitate understanding by those skilled in the art.
(1) The photovoltaic panels, also called photovoltaic modules or solar modules, are assembled together by solar cells or solar cells of different specifications cut by a laser cutting machine or a steel wire cutting machine. Since the current and the voltage of the single solar cell are very small, the single solar cell is firstly connected in series to obtain high voltage, then connected in parallel to obtain high current, and then output through a diode.
(2) The term "and/or" herein is merely an association describing an associated object, meaning that three relationships may exist, e.g., a and/or B, may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship, unless otherwise specified. Also, in the description of the embodiments of the present application, the terms "first," "second," and the like are used for descriptive purposes only and are not intended to indicate or imply relative importance nor order to indicate or imply order.
Referring to fig. 1, an intelligent photovoltaic junction box monitoring system provided for an embodiment of the present application includes:
at least one junction box 101, each junction box 101 of the at least one junction box 101 being connected to one photovoltaic panel; each junction box is used for collecting working state parameters of the connected photovoltaic panels;
the gateway 102 is configured to receive the working state parameter of the photovoltaic panel connected to each junction box 101, which is sent by each junction box 101, and obtain a working state parameter set;
and the control terminal 103 is configured to receive the working state parameter set sent by the gateway 102, and determine whether to disconnect relays of some or all of the at least one junction box 101 according to the working state parameter set, so as to cut off connections between each photovoltaic panel.
In the embodiment of the application, each junction box in at least one junction box can collect the working state parameters of the connected photovoltaic panels, and the collected working state parameters are transmitted to the control end through the gateway, so that the control end can receive the working state parameter set to determine whether to disconnect part or all relays in at least one junction box, the connection between each photovoltaic panel is cut off, the abnormity of the whole photovoltaic system caused by the abnormity of one photovoltaic panel is avoided, and the reliability and the stability of the photovoltaic system can be improved.
Further, in the embodiment of the application, when an abnormal photovoltaic panel exists in the photovoltaic panel, the control end can remotely control the relay of the junction box of the photovoltaic panel to be disconnected, so that the photovoltaic panel is disconnected from other photovoltaic panels, and the 'barrel effect' in the photovoltaic system is avoided. Where "barrel effect" refers to the magnitude of the power production of a string of photovoltaic panels being dependent on the output characteristics of the weakest photovoltaic panel in the string.
Since each of the at least one terminal block 101 has the same structure, one of the terminal blocks 101 will be described as an example in the following description. Referring to fig. 2, the junction box 101 includes a processor 1011, a power module 1012, a photovoltaic panel parameter collecting module 1013, a communication module 1014, and a photovoltaic panel voltage output control module 1015.
Wherein, the processor can be a 32-bit (Advanced RISC Machine, ARM) singlechip; the photovoltaic panel acquisition module can be one or a combination of a voltage acquisition module, a current acquisition module, a power acquisition module and a temperature acquisition module; the communication module may be a Wireless communication module, such as bluetooth communication, Wireless Fidelity (Wi-Fi), or High Power Line Communication (HPLC) communication, or other types of communication modules.
In the embodiment of the present application, the at least one junction box 101 collects the operating condition parameters of the connected photovoltaic panel, including but not limited to the following two ways:
collecting working state parameters of the connected photovoltaic panels according to a preset period; or
When first indication information sent by the gateway is received, collecting working state parameters of the connected photovoltaic panel; the first indication information is used for indicating each junction box to collect working state parameters of the connected photovoltaic panels.
In the embodiment of the application, each junction box can acquire the working state parameters of the connected photovoltaic panel according to a preset period, wherein the preset period can be preset in each junction box or can be acquired by the junction box from a control end, the preset period can be 10 minutes, 20 minutes or 30 minutes, and the shorter the time of the preset period is, the more accurate the control end monitors.
In this embodiment of the application, each junction box may also collect the operating state parameters of the connected photovoltaic panel only when receiving the first indication information sent by the gateway, or collect the operating state in another manner.
When each junction box receives first indication information sent by the gateway and then collects the working state of the connected photovoltaic panel, the method specifically comprises the following steps:
judging whether the node address carried in the first indication information is the node address of the photovoltaic panel connected with each junction box;
if yes, collecting the working state parameters of the connected photovoltaic panel.
The first indication information carries node addresses of the photovoltaic panels needing to be collected in the working state, when each junction box receives the first indication information, the first indication information is firstly analyzed to obtain the node addresses carried in the first indication information, each junction box judges whether the node addresses carried in the first indication information are the node addresses of the connected photovoltaic panels, if yes, the node addresses of the connected photovoltaic panels are collected, and if not, the node addresses are not collected, so that waste of system resources is reduced.
In this embodiment of the application, when the node address of the photovoltaic panel changes, each junction box may update the node address of the connected photovoltaic panel according to the indication information sent by the receiving control terminal. It should be noted that the node address of the photovoltaic panel refers to the number of the photovoltaic panel, such as photovoltaic panel 1, photovoltaic panel 2, ….
In an embodiment of the present application, when each junction box collects a temperature, each junction box is further configured to:
judging whether the temperature is higher than a preset temperature or not;
if yes, the relay in each junction box is disconnected.
In the specific implementation process, after the temperature of the connected photovoltaic panel is collected by each junction box, whether the collected temperature is higher than the preset temperature or not can be judged, and when the collected temperature is higher than the preset temperature, the relay in each junction box is disconnected, so that fire disasters caused by overhigh temperature are avoided.
After each junction box collects the working state parameters of the connected photovoltaic panels, the collected working state parameters are sent to the gateway through the communication module. In the embodiment of the present application, the communication mode between each junction box and the gateway may be a short-range wireless communication mode or a broadband power carrier communication mode.
Next, please refer to fig. 3, which is a schematic structural diagram of a gateway provided in the present application. The system comprises a processor 301, a communication module 302, a 485 communication interface 303, a Universal Serial Bus (USB) debugging interface 304, a power module 305, a Flash Memory (Flash)306, and a Static Random-Access Memory (SRAM) 307.
The communication module 302 may be a fourth Generation mobile communication (4-Generation wireless telephone technology, 4G) module, an ethernet communication module, a wireless communication module, an HPLC communication module, or the like; the processor 301 may be a 32-bit ARM Cortex-M4 single chip microcomputer; the on-chip Flash306 may be 512Kb (kilobit) on-chip Flash or 192Kb on-chip Flash.
In the embodiment of the application, after the gateway receives the collected working state parameters sent by each junction box, a working state parameter set is obtained. And then the obtained working parameter set is sent to the controller through the communication module.
After the controller receives the working parameter set sent by the gateway, whether to disconnect the relay in each junction box is determined according to the received working parameter set so as to cut off the connection between each photovoltaic panel, and in a specific implementation process, the control end is specifically configured to:
the control end judges whether the photovoltaic panel connected with each junction box is abnormal or not according to the working state parameter set;
if the abnormal photovoltaic panel occurs, the control end sends second indication information to the gateway to indicate the gateway to inform the junction box of the photovoltaic panel string where the abnormal photovoltaic panel is located of disconnecting the relay; wherein, the working state parameter of the photovoltaic panel connected with each junction box is any one or more of current, voltage or power of the photovoltaic panel.
In the embodiment of the present application, the operating state parameter of the photovoltaic panel includes, but is not limited to, a current of the photovoltaic panel, a voltage of the photovoltaic panel, a power of the photovoltaic panel, a temperature of the photovoltaic panel, and the like. In the following, the voltage of the photovoltaic panel and the temperature of the photovoltaic panel are taken as examples to describe how the control terminal determines whether the photovoltaic panel connected to each junction box is abnormal according to the working state parameter set.
1. Voltage of
When the relay is controlled to be in a turn-off state, detecting voltage Va at two ends of the relay and voltage Vcell of a battery string of the photovoltaic panel, and when Va is smaller than or equal to a first preset value, and Vcell is larger than n × Voc, n is a preset value, wherein Voc is open-circuit voltage of the photovoltaic panel, judging that the relay is in a short-circuit damage state; or
When the relay is controlled to be in a conducting state, detecting voltage Va at two ends of the relay, and when Va is larger than a first preset value, judging that the relay is in an open circuit damage state; or
And (4) hot spot protection judgment: obtaining Cell string voltages Vcell1, Vcell2 and Vcell3, obtaining the average voltage of the Cell string, judging that the Cell string Cell1 generates hot spots if the voltage Vcell1 of the Cell string Cell1 is smaller than 1/2 of the average voltage of the Cell string, and carrying out hot spot alarm at a control end. And judging whether other battery strings generate hot spots or not by adopting the same method. Therefore, whether the battery string generates the hot spot effect or not can be determined through the technical scheme provided by the application, so that the output failure of the photovoltaic system is avoided.
2. Temperature of
If the collected temperature of the photovoltaic panel is greater than the set temperature (80-120 ℃) and the duration time exceeds 1 minute, judging that the photovoltaic panel is over-temperature, and outputting a high-temperature alarm by the control end; if the collected temperature of the photovoltaic panel is greater than the set temperature or is above the set temperature (for example, 150 ℃) and the duration time exceeds 10 seconds, the photovoltaic panel is judged to be in fire.
In this embodiment, when the photovoltaic panel is abnormal, the control terminal is further configured to:
and outputting prompt information to prompt the photovoltaic panel to be abnormal.
In this embodiment of the application, the prompt information may be output in a voice manner, or may be output through a display unit of the control end, for example, when an abnormal photovoltaic panel exists, a red alarm sign flashes on the display unit, or of course, the prompt information may also be sent to an electronic device connected to the control end, for example, an alarm short message is sent to a mobile terminal connected to the control end, or output in another manner, which is not limited herein.
In this application embodiment, for making things convenient for the staff to look over specifically which photovoltaic panel appears unusually to and handle the photovoltaic panel that appears unusually in time, in this application embodiment, the control end still is used for:
displaying a topological graph of a photovoltaic panel connected with the at least one junction box on a display unit of the control end;
when the photovoltaic panel is abnormal, prompt information is output on the topological graph corresponding to the position of the abnormal photovoltaic panel.
In the embodiment of the present application, please refer to fig. 4, a topological graph of the photovoltaic panel connected to at least one junction box is displayed on a display unit of a control end, and when an abnormal photovoltaic panel exists in the photovoltaic panels connected to at least one junction box, a prompt message is output on the topological graph corresponding to the position of the abnormal photovoltaic panel, for example, "the abnormal photovoltaic panel occurs", or an icon of the abnormal photovoltaic panel is identified as a color different from that of icons of other normal photovoltaic panels.
In the embodiment of the application, the control terminal further provides a monitoring state query function, the query records are filtered to form a report output, and the report can be a bar graph, a pie graph or a linear graph.
Further, in the embodiment of the present application, the control end may be a local control end or a remote control end, so as to achieve automation and rationalization of device management, improve efficiency, and save maintenance cost.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present application without departing from the spirit and scope of the application. Thus, if such modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is intended to include such modifications and variations as well.
Claims (8)
1. The utility model provides a monitored control system of intelligence photovoltaic terminal box which characterized in that includes:
at least one junction box, each junction box of the at least one junction box being connected to one photovoltaic panel; each junction box is used for collecting working state parameters of the connected photovoltaic panels;
the gateway is used for receiving the working state parameters of the photovoltaic panel connected with each junction box and sent by each junction box to obtain a working state parameter set;
and the control end is used for receiving the working state parameter set sent by the gateway and determining whether to disconnect the relays of part or all of the junction boxes in the at least one junction box according to the working state parameter set so as to cut off the connection between each photovoltaic panel.
2. The monitoring system according to claim 1, wherein when each junction box collects operating state parameters of the connected photovoltaic panel, it is specifically configured to:
collecting working state parameters of the connected photovoltaic panels according to a preset period; or
When first indication information sent by the gateway is received, collecting working state parameters of the connected photovoltaic panel; the first indication information is used for indicating each junction box to collect working state parameters of the connected photovoltaic panels.
3. The monitoring system according to claim 2, wherein when each junction box receives the first indication information sent by the gateway and collects the operating state parameters of the connected photovoltaic panel, the monitoring system is specifically configured to:
judging whether the node address carried in the first indication information is the node address of the photovoltaic panel connected with each junction box;
if yes, collecting the working state parameters of the connected photovoltaic panel.
4. The monitoring system of claim 1, wherein the operating condition parameter is temperature; each junction box is further configured to:
judging whether the temperature is higher than a preset temperature or not;
if yes, the relay in each junction box is disconnected.
5. The monitoring system according to claim 1, wherein when the control end determines whether to disconnect the relay in each junction box according to the set of operating state parameters to disconnect each photovoltaic panel, it is specifically configured to:
the control end judges whether the photovoltaic panel connected with each junction box is abnormal or not according to the working state parameter set;
if the abnormal photovoltaic panel occurs, the control end sends second indication information to the gateway to indicate the gateway to inform the junction box of the photovoltaic panel string where the abnormal photovoltaic panel is located of disconnecting the relay; wherein, the working state parameter of the photovoltaic panel connected with each junction box is any one or more of current, voltage or power of the photovoltaic panel.
6. The monitoring system of claim 5, wherein the control end is further configured to:
and outputting prompt information to prompt the photovoltaic panel to be abnormal.
7. The monitoring system of claim 6, wherein the control end is further configured to:
displaying a topological graph of a photovoltaic panel connected with the at least one junction box on a display unit of the control end;
when the photovoltaic panel is abnormal, prompt information is output on the topological graph corresponding to the position of the abnormal photovoltaic panel.
8. Monitoring system according to claim 1,
each junction box sends the working state parameters to a gateway in a short-distance wireless communication or broadband power carrier communication mode;
and the gateway sends the working state parameter set to the control end in a wireless communication mode or a broadband power carrier communication mode.
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| CN201910789499.1A CN112437103A (en) | 2019-08-26 | 2019-08-26 | Intelligent photovoltaic junction box monitoring system |
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| CN201910789499.1A CN112437103A (en) | 2019-08-26 | 2019-08-26 | Intelligent photovoltaic junction box monitoring system |
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