CN114400791B - Intelligent photovoltaic power generation monitoring device based on Internet of things and automatic turn-off method - Google Patents

Intelligent photovoltaic power generation monitoring device based on Internet of things and automatic turn-off method Download PDF

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CN114400791B
CN114400791B CN202210297737.9A CN202210297737A CN114400791B CN 114400791 B CN114400791 B CN 114400791B CN 202210297737 A CN202210297737 A CN 202210297737A CN 114400791 B CN114400791 B CN 114400791B
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intelligent
things
internet
module
photovoltaic
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CN114400791A (en
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宋悦
陈泽熙
陈楠希
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Shenzhen Zhongxu New Energy Co ltd
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Shenzhen Zhongxu New Energy Co ltd
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    • 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
    • H02J13/00016—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 a wired telecommunication network or a data transmission bus
    • 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
    • H02J13/00022—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 wireless data 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
    • H02J13/00006—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
    • H02J13/00022—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 wireless data transmission
    • H02J13/00026—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 wireless data transmission involving a local wireless network, e.g. Wi-Fi, ZigBee or Bluetooth
    • 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
    • H02J13/00028—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 involving the use of Internet protocols
    • 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
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • H02J3/381—Dispersed generators
    • 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
    • H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
    • H02J2300/20—The dispersed energy generation being of renewable origin
    • H02J2300/22—The renewable source being solar energy
    • H02J2300/24—The renewable source being solar energy of photovoltaic origin
    • 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
    • Y02E10/56—Power conversion systems, e.g. maximum power point trackers
    • 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
    • Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
    • Y02E40/70—Smart grids as climate change mitigation technology in the energy generation sector
    • 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
    • Y04S10/00—Systems supporting electrical power generation, transmission or distribution
    • Y04S10/12—Monitoring or controlling equipment for energy generation units, e.g. distributed energy generation [DER] or load-side generation
    • Y04S10/123—Monitoring or controlling equipment for energy generation units, e.g. distributed energy generation [DER] or load-side generation the energy generation units being or involving renewable energy sources
    • 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
    • Y04S40/126—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 wireless data transmission

Abstract

The invention discloses an intelligent photovoltaic power generation monitoring device based on the Internet of things, which comprises an intelligent safety centralized control gateway, a central control collector and at least one intelligent Internet of things junction box; the intelligent Internet of things junction box comprises a turn-off circuit module, a sub-control module and an auxiliary power supply module, the intelligent safety centralized control gateway performs data interaction with the central control collector through a circuit and obtains power supply from the central control collector; the intelligent security centralized control gateway is used for realizing internal local area Internet of things networking with the intelligent Internet of things junction box through built-in coordinator software, and performing data interaction with the intelligent Internet of things junction box through the internal local area Internet of things. The invention also discloses an automatic turn-off method of the intelligent photovoltaic power generation monitoring device. The invention has the advantages of low cost, high reliability and improved generating capacity.

Description

Intelligent photovoltaic power generation monitoring device based on Internet of things and automatic turn-off method
Technical Field
The invention relates to the field of photovoltaic power generation, in particular to an intelligent photovoltaic power generation monitoring device based on the Internet of things and an automatic turn-off method technology.
Background
At present, the photovoltaic power generation system still has the situation that no special safety protection measures exist. Typically, the outputs of the individual photovoltaic modules are connected in series with each other to form a series line, the output voltage of which is often more than 200V in normal power generation conditions, whereas some large photovoltaic plant projects even exceed 1000V, which would constitute a voltage that could be dangerous to touch. Particularly, in the construction process of a photovoltaic project and the inspection and maintenance process of a photovoltaic power station, the risk of electric shock of construction and operation and maintenance personnel is caused.
National Electrical Code (NEC 2017 for short) forced to take effect in 2019, 1/1, clearly requires that a photovoltaic module needs to have a module-level quick-shutdown function, which is forced to take effect in 2019, 1/1. Provision is made in the latest edition of NEC 2017-690.12 (B): 1) photovoltaic modules mounted on or on the roof of a building must be provided with a fast shut-off; 2) within 30 seconds after the start of the quick shut-off device: photovoltaic array 1 foot out: the voltage is less than or equal to 30V; photovoltaic array 1 foot range: the voltage is less than or equal to 80V.
To address the safety issues of photovoltaic power generation systems, in the prior art, U.S. Pat. No. US10256770B2, the Tigo Energy corporation, usa, discloses a system and method for automatically shutting down, disconnecting or reducing the power and output voltage of a solar panel. The Tigo Energy company intelligent photovoltaic assembly product comprises a controller and a circuit, wherein the controller detects abnormity in heartbeat signals from a central controller; wherein, in response to the anomaly, the controller causes the voltage regulator to reduce the power output of the photovoltaic component, for example: when no "heartbeat" signal is received for a period of time (about 7.5 seconds, corresponding to about 7 missed signals), the controller and circuitry "turns off" the power output of the photovoltaic module by reducing the output voltage of the photovoltaic module to-0.7V. In order to ensure the safety and reliability of the controller continuously receiving the signal of the central controller, the current technical scheme of "heartbeat" signal communication generally adopts a technical scheme based on power line carrier communication (PLC). In the scheme, not only the corresponding PLC sending module needs to be added in the photovoltaic inversion system, but also an additional PLC receiving module needs to be arranged on the intelligent Internet of things junction box of the photovoltaic module. Because the system depends on power carrier communication (PLC), the attenuation problem of signal transmission of the power carrier communication exists, the number and the string length of each set of quick turn-off device acting on photovoltaic module strings are limited, and the power carrier communication is transmitted through convergence instead of transmission, so that the system is not suitable for a convergence box of a centralized photovoltaic power station, the cost of the photovoltaic modules and the self power consumption of the system are increased by the power carrier communication, and more fault points of a signal source sending and receiving module are increased.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide an intelligent photovoltaic power generation monitoring device based on the internet of things and an automatic turn-off method, so that the working state of a photovoltaic assembly is monitored, the fault of the photovoltaic assembly is early warned, meanwhile, a signal sending module and a signal receiving module which use a PLC power carrier scheme are omitted, the reliability of implementing wireless communication control is improved, the cost is low, the reliability is high, and the power generation capacity is improved.
In order to achieve the purpose, the invention adopts the following technical scheme:
an intelligent photovoltaic power generation monitoring device based on the Internet of things comprises an intelligent safety centralized control gateway, a central control collector and at least one intelligent Internet of things junction box; the intelligent internet of things junction box is configured on or externally arranged on a photovoltaic assembly in an intelligent photovoltaic power generation system based on the internet of things, and comprises a turn-off circuit module, a sub-control module and an auxiliary power module, wherein the auxiliary power module obtains power supply through the output end of the photovoltaic assembly and supplies power to the turn-off circuit module and the sub-control module, and the sub-control module controls the on and off of a switch device of the turn-off circuit module; the sub-control module comprises an acquisition module, a processor control module, a data storage module and an Internet of things communication module, wherein the processor control module acquires current and voltage parameters of the turn-off circuit module and the temperature of the intelligent Internet of things junction box through the acquisition module; the processor control module is used for communicating with the intelligent safety centralized control gateway through an internet of things communication module, storing and reading data into the data storage module, storing a preset current threshold value into the data storage module, reading the current threshold value by the processor control module, and comparing the current data with the current data of the turn-off circuit module collected by the collection module to determine the working mode of the intelligent internet of things junction box; the sub-control module has the functions of realizing local safety control and data acquisition and the function of routing nodes of Internet of things communication, and can receive and forward data of other intelligent Internet of things junction boxes; the intelligent Internet of things junction box is used for safe turn-off and intelligent monitoring and photovoltaic power optimization; the acquisition module is used for acquiring electric signals of current and voltage parameters of the correspondingly arranged turn-off circuit; the intelligent safety centralized control gateway is connected with the central control collector through a circuit, performs data interaction with the central control collector through the circuit, and obtains power supply from the central control collector; the intelligent safety centralized control gateway is configured around the photovoltaic module, is arranged adjacent to the intelligent Internet of things junction box, has the functions of an Internet of things coordinator and routing, realizes internal local Internet of things networking with the intelligent Internet of things junction box through built-in coordinator software, and performs data interaction with the intelligent Internet of things junction box through an internal local Internet of things; the central control collector is further connected with a photovoltaic inverter circuit in the intelligent photovoltaic power generation system based on the Internet of things, and the central control collector is connected with an external wide area Internet and a cloud platform through wires or wireless connection and obtains power supply from an access point behind an alternating current output end of the photovoltaic inverter.
The local sub-control module of the intelligent Internet of things junction box distinguishes different working modes of the local intelligent Internet of things junction box according to output current sampling of a turn-off circuit, wherein the working modes comprise a normal working mode and a safe working mode; the safe working mode is that the local sub-control module receives a periodic safe broadcast signal from the intelligent safe centralized control gateway, whether the periodic safe broadcast signal is detected within a certain time period to indicate and adjust the state of the shutdown circuit, and if so, the sub-control module is used for adjusting the shutdown circuit to be in a connected state or maintaining the connected state; if the photovoltaic module is abnormal, the remote unit responds to the detected abnormality and sends out an abnormal periodic broadcast signal or stops sending the periodic broadcast signal, and the local sub-control module enables the turn-off circuit to close the power output of the photovoltaic module; the normal working mode refers to a working mode except the safe working mode, and at the moment, the local intelligent Internet of things junction box is controlled by the local sub-control module, is not controlled by the intelligent safe centralized control gateway, and does not respond to the periodic safe broadcast signals from the intelligent safe centralized control gateway.
The local sub-control module of the intelligent Internet of things junction box is used for collecting the output voltage and current parameters of the photovoltaic module and the internal temperature of the intelligent Internet of things junction box and sending the output voltage and current parameters and the internal temperature to the central control collector through the intelligent safety centralized control gateway in a video-on-demand mode.
The central control collector obtains electricity through an access point between an alternating current output end of the photovoltaic inverter and a grid connection point;
the central control collector sends a safety broadcast signal for stopping the periodicity of the intelligent safety centralized control gateway by an instruction to the intelligent safety centralized control gateway through a line, and the instruction is divided into a safety instruction and an abnormal instruction; the central control collector acquires power generation data of the photovoltaic inverter through a connecting wire cable to obtain string current data of the intelligent photovoltaic power generation monitoring device, when the parameter change of the string current is larger than or smaller than a current threshold value, the central control collector operates in a corresponding working mode, the working mode comprises a normal working mode and a safe working mode, the central control collector does not send periodic safety instructions to the intelligent safety centralized control gateway in the safe working mode, and the intelligent safety centralized control gateway continuously broadcasts periodic signals to an intelligent internet of things junction box of an internal local internet of things; under a normal working mode, the central control collector sends periodic safety instructions to the intelligent safety centralized control gateway, and the intelligent safety centralized control gateway stops continuously broadcasting periodic safety broadcasting signals to an intelligent internet of things junction box of an internal local internet of things after receiving the periodic safety instructions sent by the central control collector; the abnormal instruction is that the central control collector receives the abnormality of fire, earthquake and tsunami from the cloud platform or receives the abnormality of direct current arc discharge and wire insulation from the photovoltaic inverter, and sends an abnormal instruction to the intelligent safety centralized control gateway, and the central control collector sends an abnormal release instruction to the intelligent safety centralized control gateway after receiving the abnormality of fire, earthquake and tsunami from the cloud platform or receiving the abnormal release of direct current arc discharge and wire insulation from the photovoltaic inverter; after receiving the abnormality initiating instruction sent by the central control collector, the intelligent security centralized control gateway stops continuously broadcasting periodic security broadcasting signals to the intelligent internet-of-things junction box of the internal local internet of things until the intelligent security centralized control gateway receives an abnormality removing instruction sent by the central control collector; after the intelligent security centralized control gateway is powered on, the intelligent security centralized control gateway continuously broadcasts periodic signals to the intelligent Internet of things junction box of the internal local area Internet of things until the intelligent security centralized control gateway receives the periodic security instructions sent by the central control collector, and then stops continuously broadcasting the periodic signals to the intelligent Internet of things junction box of the internal local area Internet of things; if the intelligent security centralized control gateway does not receive the periodic security instruction, the intelligent security centralized control gateway can restore to continuously broadcast the periodic signal to the intelligent internet of things junction box of the internal local internet of things.
The internet of things communication module is based on any one wireless communication protocol of Zigbee, Bluetooth MESH and LORA.
The intelligent security centralized control gateway gets electricity through the central control collector, is supplied power by the inside double-circuit power supply unit of central control collector, wherein is the power supply unit of central control collector all the way, is the special power supply unit of the power supply unit who is independent of the central control collector all the way in addition.
An automatic turn-off method of an intelligent photovoltaic power generation monitoring device based on the Internet of things comprises the following steps:
the remote control method comprises the steps of carrying out automatic turn-off control through a cloud platform;
the field control method comprises the field control after the house or the building provided with the intelligent photovoltaic power generation monitoring device based on the Internet of things has fire and other emergency accidents.
The remote control method comprises the following steps: the intelligent photovoltaic power generation monitoring device based on the Internet of things generates electric power through a photovoltaic cell of a photovoltaic module; in a normal working mode, the local intelligent Internet of things junction box of the photovoltaic module is controlled by the local sub-control module, is not controlled by the remote intelligent security centralized control gateway and does not respond to periodic security broadcast signals from the intelligent security centralized control gateway of the remote unit; the local sub-control module of the intelligent Internet of things junction box acquires the output voltage and current parameters of the photovoltaic module and the data of the internal temperature of the intelligent Internet of things junction box, and sends the acquired output voltage and current parameters of the photovoltaic module and the data of the internal temperature of the intelligent Internet of things junction box to the central control collector through the intelligent safety centralized control gateway in a video-on-demand mode; when the photovoltaic inverter or the direct current combiner box monitors an abnormal condition or receives an abnormal condition notice from the cloud platform, firstly, the photovoltaic inverter or the direct current combiner box is stopped, at the moment, a series circuit formed by the output end of the photovoltaic module forms an open circuit, the current value on the series circuit is reduced to be below a preset current threshold value of a safe working mode, and the intelligent photovoltaic module based on the internet of things enters the safe working mode; meanwhile, the central control collector receives an abnormal instruction from the cloud platform, and the abnormal instruction is sent to the intelligent security centralized control gateway by the central control collector, and the intelligent security centralized control gateway stops continuously broadcasting periodic security broadcasting signals to the intelligent internet-of-things junction box of the internal local internet of things after receiving the abnormal instruction sent by the central control collector; the method comprises the steps that a sub-control module of an intelligent Internet of things junction box of a photovoltaic assembly is communicated with a remote unit arranged in an intelligent safety centralized control gateway in a safety working mode, and comprises the steps of receiving periodic safety broadcast signals from the remote unit, when the sub-control module monitors the abnormity of the periodic safety broadcast signals detected from the remote unit, the abnormity of the safety broadcast signals means that the sub-control module detects that the safety broadcast signals disappear or the safety broadcast signals detected in unit time do not reach a preset number of times, responding to the abnormity by the sub-control module, and switching off a switching-off circuit of the intelligent Internet of things junction box to switch off the power output of the photovoltaic assembly and reduce the output voltage of a voltage regulator or the switching-off circuit of the intelligent Internet of things junction box to a safety value; when the photovoltaic inverter or the direct current combiner box monitors that the abnormal condition is removed or an abnormal condition removing notice is received from the cloud platform, the photovoltaic inverter or the direct current combiner box is started up again, meanwhile, the central control collector receives an abnormal removing instruction from the cloud platform and sends an abnormal removing instruction to the intelligent security centralized control gateway, and the intelligent security centralized control gateway continuously broadcasts periodic security broadcast signals to the intelligent internet of things junction box of the internal local internet of things after receiving the abnormal removing instruction sent by the central control collector; the sub-control module of the intelligent Internet of things junction box of the photovoltaic module is communicated with a remote unit arranged on an intelligent safety centralized control gateway in a safety working mode, and comprises a receiving module for receiving periodic safety broadcast signals from the remote unit, when the monitoring result shows that the periodic safety broadcast signals from the remote unit are normal, the normal safety broadcast signals mean that the sub-control module detects the safety broadcast signals of preset times in unit time, the sub-control module responds to the normal state, the sub-control module is communicated with a turn-off circuit of the intelligent Internet of things junction box to recover the power output of the photovoltaic module, and the output voltage of a voltage regulator or the turn-off circuit of the intelligent Internet of things junction box is recovered to a working value.
The field control method comprises the following steps: the intelligent photovoltaic power generation monitoring device based on the Internet of things generates electric power through a photovoltaic cell of a photovoltaic module; in a normal working mode, the local intelligent Internet of things junction box of the photovoltaic module is controlled by the local sub-control module, is not controlled by the remote intelligent security centralized control gateway and does not respond to periodic security broadcast signals from the intelligent security centralized control gateway of the remote unit; the local sub-control module of the intelligent Internet of things junction box acquires data of output voltage and current parameters of a photovoltaic module and the internal temperature of the junction box and sends the data to the central control collector through the intelligent safety centralized control gateway in an on-demand mode; when a house or a building provided with the intelligent photovoltaic power generation monitoring device based on the Internet of things has an emergency accident such as a fire disaster, a house owner or a manager and a fire fighter turn off a grid-connected switch of a grid-connected point of the intelligent photovoltaic power generation monitoring device based on the Internet of things or a main grid-to-home switch of the house on site; when the grid-connected switch of the grid-connected point or the power grid home-entry main switch is switched off, firstly, the photovoltaic inverter is shut down, at the moment, a series circuit formed by the output end of the photovoltaic module forms an open circuit, the current value on the series circuit is reduced to be below a preset current threshold value of a safe working mode, and the photovoltaic module enters the safe working mode; meanwhile, the intelligent safety centralized control gateway is shut down when power is lost, and the intelligent Internet of things junction box of the internal local Internet of things is stopped from continuously broadcasting periodic safety broadcasting signals; the method comprises the steps that a sub-control module of an intelligent Internet of things junction box of a photovoltaic assembly is communicated with a remote unit arranged on an intelligent safety centralized control gateway in a safety working mode, and comprises the steps of receiving periodic safety broadcast signals from the remote unit, when the sub-control module monitors the abnormity of the periodic safety broadcast signals detected from the remote unit, the abnormity of the safety broadcast signals means that the sub-control module detects that the safety broadcast signals disappear or the safety broadcast signals detected in unit time do not reach a preset number of times, the sub-control module responds to the abnormity, the sub-control module turns off a turn-off circuit of the intelligent Internet of things junction box to turn off the power output of the photovoltaic assembly, and the output voltage of a voltage regulator or the turn-off circuit of the intelligent Internet of things junction box is reduced to a safety value; when the emergency accident is relieved, the house owner or manager and the fire fighter can recover to connect the grid-connected switch of the grid-connected point of the intelligent photovoltaic power generation monitoring device based on the internet of things or the house power grid-to-home master switch of the house on site; firstly, the photovoltaic inverter or the direct current combiner box is recovered to be started, and the intelligent security centralized control gateway continuously broadcasts periodic security broadcast signals to an intelligent Internet of things junction box of an internal local Internet of things; the method comprises the steps that a sub-control module of an intelligent internet-of-things junction box of a photovoltaic module is communicated with a remote unit arranged on an intelligent safety centralized control gateway in a safety working mode, and comprises the steps of receiving periodic safety broadcast signals from the remote unit, when the condition that the periodic safety broadcast signals from the remote unit are detected is monitored to be normal, the normal condition of the safety broadcast signals means that the sub-control module detects the safety broadcast signals with preset times in unit time, the sub-control module responds to be normal, a turn-off circuit communicated with the intelligent internet-of-things junction box is communicated by the sub-control module to recover the power output of the photovoltaic module, and the output voltage of a voltage regulator or the turn-off circuit of the intelligent internet-of-things junction box is recovered to a working value.
The central control collector and the intelligent internet of things junction box are distinguished in corresponding working modes, namely a normal working mode and a safe working mode, or distinguished through string power of photovoltaic string connected to the photovoltaic inverter or photovoltaic module power connected to the intelligent internet of things junction box.
The invention has the following beneficial effects:
(1) according to the intelligent photovoltaic power generation monitoring device based on the Internet of things, the turn-off circuit of the intelligent Internet of things junction box is adjusted by the sub-control module to be switched between a turn-off state and a turn-on state, and is provided with the intelligent safety centralized control gateway capable of sending periodic safety broadcast signals to the sub-control module; and the power generation loss generated in a medium and high current power generation interval (accounting for more than 98.8 percent of the total power generation amount) caused by unstable transmission of communication signals of the internet of things between the intelligent security centralized control gateway and the intelligent internet of things junction box is avoided.
(2) The invention is an intelligent photovoltaic power generation monitoring device based on the Internet of things, on one hand, the device level monitoring and fault early warning can be realized, and meanwhile, the high requirement of a conventional watchdog type quick shutoff device on the continuous reliability of heartbeat signal acquisition can be avoided, a heartbeat communication signal does not need to be continuously sent through a PLC (programmable logic controller) circuit, a periodic excitation pulse source does not need to be sent on a direct current bus, the use of a special signal receiver is reduced, the signal transmission between a central control module and a sub-control module can be completed by using a wireless communication mode with lower stability, and the device is not limited by the parallel connection of the number of photovoltaic module strings, the string length and the string group; the intelligent safety centralized control gateway is powered by a double-path power supply unit in the central control collector, wherein one path is a special power supply unit independent of the power supply unit of the central control collector, so that when the central control collector is in fault shutdown or an external network fails, the intelligent safety centralized control gateway can still maintain normal power supply, normal networking of an internal local area network is ensured, and a periodic safe broadcast signal is provided, so that an intelligent photovoltaic module based on the Internet of things can still normally generate power and run; the intelligent safe photovoltaic power generation system based on the Internet of things is particularly suitable for large-scale low-cost, reliable and safe application of large and medium-sized industrial and commercial roof distributed power stations with simple terrain and overwater floating photovoltaic power stations.
(3) The intelligent photovoltaic power generation monitoring device based on the Internet of things further has the following beneficial effects: in the stage of needing to be installed and maintained, the safe broadcast communication signal transmission of the intelligent safe centralized control gateway is stopped, so that all direct current sources can be stably, safely and reliably disconnected from the series circuit, the voltage of the series circuit is reduced to a safe range, and the safety of installation and maintenance personnel is guaranteed; meanwhile, in the emergency situations of fire, earthquake, flood, hurricane and the like, or in the abnormal states of the photovoltaic power generation system such as open circuit of the photovoltaic string caused by faults of electric arc, electric leakage and the like, due to shutdown of the inverter, the output end of the series circuit is switched to be open circuit, and the intelligent safety centralized control gateway is remotely controlled to stop sending the safety broadcast signal, so that all direct current sources configured with the relevant open circuit are automatically disconnected, the voltage of the series circuit is reduced to a safety range, and the safety of the photovoltaic power generation system is guaranteed.
(4) Compared with the prior art, the intelligent photovoltaic power generation monitoring device based on the internet of things has the advantages that different requirements of a safe working mode and a normal working mode are distinguished, and the working modes are distinguished through current or power. In a safe working mode, the intelligent safe centralized control gateway generates a periodic safe instruction to the intelligent Internet of things junction box in a broadcasting mode, so that the high reliability of the photovoltaic module in power generation is ensured; in a normal working mode, the central control collector sends periodic safety instructions to the intelligent safety centralized control gateway, and the intelligent safety centralized control gateway stops continuously broadcasting periodic safety broadcasting signals to an intelligent internet of things junction box of an internal local internet of things after receiving the periodic safety instructions sent by the central control collector; the timeliness and the reliability of the power generation information of the photovoltaic module uploaded by the intelligent Internet of things junction box in the normal working mode are guaranteed, and meanwhile, the blocking of a broadcast storm and data transmission possibly caused by periodic safe broadcasting of the intelligent safety centralized control gateway is avoided.
Drawings
Fig. 1 is a block diagram (one) of an intelligent photovoltaic power generation monitoring device based on the internet of things in a safe working mode;
FIG. 2 is a block diagram (II) of the intelligent photovoltaic power generation monitoring device based on the Internet of things in a safe working mode;
FIG. 3 is a block diagram (I) of the intelligent photovoltaic power generation monitoring device based on the Internet of things in a normal working mode;
fig. 4 is a block diagram (ii) of the intelligent photovoltaic power generation monitoring device based on the internet of things in a normal working mode.
Detailed Description
This is further explained below with reference to the drawings.
In a first aspect, an embodiment of the present application provides an intelligent photovoltaic power generation monitoring device based on the internet of things, including: the intelligent security centralized control gateway, the central control collector and at least one intelligent Internet of things junction box. The above components are labeled in fig. 1-2, 3-4.
The intelligent Internet of things junction box is configured on the photovoltaic assembly or externally arranged on the photovoltaic assembly and can also replace a conventional junction box, the intelligent Internet of things junction box comprises a turn-off circuit module, a sub-control module and an auxiliary power supply module, the auxiliary power supply module obtains power supply through the output end of the photovoltaic assembly and supplies power to the turn-off circuit module and the sub-control module, and the sub-control module controls the on and off of a switch device of the turn-off circuit module. The sub-control module comprises an acquisition module, a processor control module, a data storage module and an internet of things communication module, has the functions of realizing local safety control and data acquisition, has the function of a routing node of internet of things communication, and can receive and forward data of other intelligent internet of things junction boxes; the intelligent internet of things junction box can be a junction box only having the functions of safe turn-off and intelligent monitoring, and can also be an intelligent internet of things junction box having the function of photovoltaic power optimization during sampling. In the sub-control module, the processor control module acquires current and voltage parameters of the turn-off circuit module and the temperature of the intelligent Internet of things junction box through an acquisition module; the processor control module is communicated with the intelligent safety centralized control gateway through the internet of things communication module, stores and reads data to the data storage module, stores a preset current threshold value, and compares the current threshold value with current data of the turn-off circuit module collected by the collection module, and determines the working mode of the intelligent internet of things junction box.
The intelligent safety centralized control gateway is configured at the periphery of the photovoltaic module, is arranged adjacent to the intelligent Internet of things junction box, has the functions of an Internet of things coordinator and routing, realizes internal local Internet of things networking with the intelligent Internet of things junction box through built-in coordinator software, and performs data interaction with the intelligent Internet of things junction box through an internal local Internet of things; the intelligent safety centralized control gateway is connected with the central control collector through a wire, performs data interaction with the central control collector through the wire, and obtains power supply from the central control collector through the wire.
The central control collector is connected with the intelligent safety centralized control gateway and a photovoltaic inverter of the photovoltaic power generation system through wires, is connected with an external wide area Internet through wires or wirelessly, and obtains power supply from the alternating current output end of the photovoltaic inverter.
The local sub-control module of the intelligent Internet of things junction box distinguishes different working modes of the local intelligent Internet of things junction box according to output current sampling of the turn-off circuit, and the working modes comprise a normal working mode and a safe working mode.
As shown in fig. 1 and 2, the safe operation mode is that the sub-control module receives a periodic safe broadcast signal from the intelligent security centralized control gateway, and adjusts the state of the shutdown circuit according to whether the periodic safe broadcast signal is detected within a certain time period, if so, the sub-control module is configured to adjust the shutdown circuit to be in a connected state or maintain the connected state, and if not, the remote unit sends an abnormal periodic broadcast signal or stops sending the periodic broadcast signal in response to the detected abnormality, the sub-control module is configured to adjust the shutdown circuit to be in a disconnected state or maintain the disconnected state.
As shown in fig. 3 and 4, the normal operation mode refers to an operation mode other than the safety operation mode, and the intelligent internet of things junction box is controlled by the local sub-control module, is not controlled by the remote intelligent centralized security gateway, and does not respond to the periodic safety broadcast signal from the intelligent centralized security gateway of the remote unit; at the moment, the local sub-control module of the intelligent internet of things junction box acquires data such as output voltage and current parameters of the photovoltaic module and internal temperature of the junction box, and sends the data to the central control collector through the intelligent safety centralized control gateway in a video-on-demand mode.
The central control collector is connected with the intelligent safety centralized control gateway through a wire to obtain the working voltage and current of the photovoltaic module of each intelligent Internet of things junction box of the internal local area network and the operation data such as the internal temperature of the junction box and the string current and voltage operation data of the photovoltaic inverter of the photovoltaic power generation system, and sends the cloud platform to the cloud platform through the wire or wireless connection external wide area Internet to perform photovoltaic module fault extraction and early warning.
Further, a central control collector collects power generation data of a photovoltaic inverter in an intelligent photovoltaic power generation system through a connection cable to obtain string current data of the intelligent photovoltaic power generation monitoring device, when the parameter change of the string current is larger than or smaller than a current threshold value, the central control collector is used for operating in a corresponding working mode, the working mode comprises a normal working mode and a safe working mode, the central control collector does not send periodic safety instructions to the intelligent safety centralized control gateway in the safe working mode, and at the moment, the intelligent safety centralized control gateway continuously broadcasts periodic signals to an intelligent internet of things junction box of an internal local area internet of things; under a normal working mode, the central control collector sends periodic safety instructions to the intelligent safety centralized control gateway, and after receiving the periodic safety instructions sent by the central control collector, the intelligent safety centralized control network stops continuously broadcasting periodic safety broadcasting signals to an intelligent Internet of things junction box of an internal local Internet of things; the abnormal instruction is that the central control collector receives the abnormality of fire, earthquake and tsunami from the cloud platform or receives the abnormality of direct current arc discharge and wire insulation from the photovoltaic inverter, and sends an abnormal initiating instruction to the intelligent safety centralized control gateway, and the central control collector sends an abnormal removing instruction to the intelligent safety centralized control gateway after receiving the abnormality of fire, earthquake and tsunami from the cloud platform or receiving the abnormal removal of direct current arc discharge and wire insulation from the photovoltaic inverter; after receiving the abnormality initiating instruction sent by the central control collector, the intelligent security centralized control gateway stops continuously broadcasting periodic security broadcasting signals to the intelligent internet-of-things junction box of the internal local internet of things until the intelligent security centralized control gateway receives an abnormality removing instruction sent by the central control collector; after the intelligent security centralized control gateway is powered on, the intelligent security centralized control gateway continuously broadcasts periodic signals to the intelligent Internet of things junction box of the internal local area Internet of things until the intelligent security centralized control gateway receives the periodic security instructions sent by the central control collector, and then stops continuously broadcasting the periodic signals to the intelligent Internet of things junction box of the internal local area Internet of things; if the intelligent security centralized control gateway does not receive the periodic security instruction, the intelligent security centralized control gateway resumes broadcasting the periodic signal to the intelligent internet of things junction box of the internal local internet of things continuously.
The central control collector and the intelligent internet of things junction box are distinguished in corresponding working modes, namely a normal working mode and a safe working mode, by current; of course, the photovoltaic module power can be distinguished by the string power of the photovoltaic string connected to the photovoltaic inverter or the photovoltaic module power connected to the intelligent internet of things junction box.
In a second aspect, the embodiment of the application provides an operation and maintenance method for an intelligent photovoltaic power generation monitoring device based on the internet of things. The intelligent photovoltaic power generation monitoring device based on the Internet of things is applied to the intelligent photovoltaic power generation monitoring device based on the Internet of things and comprising at least one intelligent Internet of things junction box, an intelligent safety centralized control gateway and a central control collector, wherein the intelligent Internet of things junction box can be a junction box only having the functions of safety shutdown and intelligent monitoring, and can also be an intelligent Internet of things junction box having the function of photovoltaic power optimization during sampling. Intelligence thing networking terminal box control module includes collection module, treater control module, data storage module, thing networking communication module, has and realizes local safety control and data acquisition function to have the route node function of thing networking communication, can receive and forward the data of other intelligent thing networking terminal boxes.
The intelligent safety centralized control gateway has the functions of an Internet of things coordinator and routing, realizes internal local Internet of things networking with an intelligent Internet of things junction box through built-in coordinator software, and performs data interaction with the intelligent Internet of things junction box through an internal local Internet of things; the intelligent safety centralized control gateway is connected with the central control collector through a wire, performs data interaction with the central control collector through the wire, and obtains power supply from the central control collector through the wire.
The central control collector is connected with the intelligent safety centralized control gateway through a wire to obtain the working voltage and current of the photovoltaic module of each intelligent Internet of things junction box of the internal local area network, the operation data such as the internal temperature of the junction box and the group string current and voltage operation data of the photovoltaic inverter of the photovoltaic power generation system, and the photovoltaic module is connected with a cloud platform through a wire or a wireless way on the external wide area Internet to perform photovoltaic module fault extraction and early warning.
The operation maintenance method of the intelligent photovoltaic power generation monitoring device based on the Internet of things can be divided into a remote automatic turn-off method and a field rapid safe turn-off method.
The invention discloses an intelligent photovoltaic power generation monitoring device of the Internet of things and an automatic turn-off method, which are mainly applied to component level monitoring, fault early warning and remote automatic safe turn-off of a photovoltaic component in the operation process of the intelligent photovoltaic power generation monitoring device based on the Internet of things.
It includes: the photovoltaic cell of the photovoltaic module generates electric power, and in a normal working mode, the local intelligent Internet of things junction box of the photovoltaic module is controlled by the local sub-control module, is not controlled by the remote intelligent security centralized control gateway, and does not respond to periodic security broadcast signals from the intelligent security centralized control gateway of the remote unit. The local sub-control module of the intelligent Internet of things junction box collects data such as output voltage and current parameters of the photovoltaic module and internal temperature of the junction box and sends the data to the central control collector through the intelligent safety centralized control gateway in a video-on-demand mode.
When the photovoltaic inverter or the direct current combiner box monitors an abnormal condition or receives an abnormal condition notice from the cloud platform network, firstly, the photovoltaic inverter or the direct current combiner box stops, a series circuit formed by the output end of the photovoltaic module forms an open circuit, the current value on the series circuit is reduced to be below a preset threshold value of a safe working mode, and the intelligent photovoltaic module based on the Internet of things enters the safe working mode. Meanwhile, the central control collector receives an abnormal instruction from the cloud platform, the abnormal instruction is sent to the intelligent security centralized control gateway by the central control collector, and the intelligent security centralized control gateway stops continuously broadcasting periodic security broadcasting signals to the intelligent internet of things junction box of the internal local internet of things after receiving the abnormal instruction sent by the central control collector.
In a safe working mode, a sub-controller of an intelligent internet-of-things junction box of the photovoltaic module is communicated with a remote unit arranged on an intelligent safe centralized control gateway, and comprises a receiving unit for receiving periodic safe broadcast signals from the remote unit, when the sub-control module monitors the abnormity of the periodic safe broadcast signals detected from the remote unit, the abnormity of the safe broadcast signals means that the sub-control module detects that the safe broadcast signals disappear or the safe broadcast signals detected in unit time do not reach a preset number of times, the sub-control module responds to the abnormity, the sub-controller turns off a turn-off circuit of the intelligent internet-of-things junction box so as to turn off the power output of the photovoltaic module, and the output voltage of a voltage regulator or a turn-off circuit of the intelligent internet-of-things junction box is reduced to a safe value. The sub-controller in the present invention refers to the sub-control module.
When the photovoltaic inverter or the direct current combiner box monitors that the abnormal condition is relieved or receives an abnormal condition relieving notice from the cloud platform network, the photovoltaic inverter or the direct current combiner box is started again at first. Meanwhile, the central control collector receives an abnormal removing instruction from the cloud platform, the abnormal removing instruction is sent to the intelligent safety centralized control gateway by the central control collector, and after the intelligent safety centralized control gateway receives the abnormal removing instruction sent by the central control collector, the intelligent internet of things junction box of the internal local internet of things continuously broadcasts periodic safety broadcast signals.
In a safe working mode, a sub-controller of an intelligent internet-of-things junction box of the photovoltaic module is communicated with an intelligent safe centralized control gateway, and the communication comprises the steps of receiving periodic safe broadcast signals from a remote unit, detecting the normality of the periodic safe broadcast signals from the remote unit when the monitoring shows that the periodic safe broadcast signals from the remote unit are normal, wherein the normality of the safe broadcast signals refers to the fact that the sub-control module detects the safe broadcast signals of preset times in unit time, the sub-control module responds to be normal, the sub-controller is communicated with a turn-off circuit of the intelligent internet-of-things junction box to recover the power output of the photovoltaic module, and the output voltage of a voltage regulator or a turn-off circuit of the intelligent internet-of-things junction box is recovered to a working value.
The invention discloses an automatic turn-off method of an intelligent photovoltaic power generation monitoring device of the Internet of things, which is mainly applied to a field manual rapid safe turn-off method after emergency events such as fire disasters, tsunamis and the like occur in the assembly level monitoring, the fault early warning and field installation, the operation and maintenance process of the intelligent photovoltaic power generation monitoring device based on the Internet of things.
The photovoltaic cell of the photovoltaic module generates electric power, and in a normal working mode, the local intelligent Internet of things junction box of the photovoltaic module is controlled by the local sub-control module, is not controlled by the remote intelligent security centralized control gateway, and does not respond to periodic security broadcast signals from the intelligent security centralized control gateway of the remote unit. The local sub-control module of the intelligent Internet of things junction box collects data such as output voltage and current parameters of the photovoltaic module and internal temperature of the junction box and sends the data to the central control collector through the intelligent safety centralized control gateway in a video-on-demand mode.
When photovoltaic modules are installed, shut down, operation and maintenance, overhaul and need to be turned off due to fire, earthquake, tsunami and the like, the emergency safety switch is started to disconnect the alternating current grid-connected switch of the photovoltaic modules, at the moment, a series circuit formed by the output ends of the photovoltaic modules forms an open circuit, the current value on the series circuit is reduced to be below a preset threshold value of a safe working mode, and the intelligent photovoltaic modules based on the Internet of things enter the safe working mode.
Meanwhile, the intelligent security centralized control gateway loses power supply and stops continuously broadcasting periodic security broadcasting signals to the intelligent internet of things junction box of the internal local internet of things.
In the safe working mode, a sub-controller of the intelligent internet-of-things junction box of the photovoltaic module is communicated with a remote unit arranged on the intelligent safe centralized control gateway, and the method comprises the steps of receiving periodic safe broadcast signals from the remote unit, and when the abnormity (stop) of the periodic safe broadcast signals from the remote unit and the response abnormity are monitored, turning off a turn-off circuit of the intelligent internet-of-things junction box by the sub-controller to turn off the power output of the photovoltaic module and reduce the output voltage of a voltage regulator or the turn-off circuit of the intelligent internet-of-things junction box to a safe value.
When the photovoltaic module is installed, shut down, operation and maintenance are completed, and safety shutdown is required to be removed after emergency conditions such as fire, earthquake and tsunami are removed, the intelligent safety centralized control gateway recovers power supply by removing the emergency safety switch and recovering the alternating current grid-connected switch of the photovoltaic module, and recovers to continuously broadcast periodic safety broadcast signals to the intelligent Internet of things junction box of the internal local Internet of things.
Under the safe working mode, a sub-controller of the intelligent internet of things junction box of the photovoltaic module is communicated with the intelligent safety centralized control gateway, and the sub-controller receives periodic safe broadcast signals from the remote unit, and when the detection of the normality and the response normality of the periodic safe broadcast signals from the remote unit are monitored, the sub-controller communicates a turn-off circuit of the intelligent internet of things junction box to recover the power output of the photovoltaic module, and the output voltage of a voltage regulator or the turn-off circuit of the intelligent internet of things junction box is recovered to a working value.
According to the method, the automatic safe shutoff is divided into remote control, and the remote control is performed through a cloud platform, for example, the cloud platform collects earthquake and tsunami information, and the remote control safe shutoff is performed; the other is that after the on-site inverter detects an arc fault or a fire, and after an alternating current power grid of a local house or a building is disconnected, the inverter is firstly opened, the system enters a safe mode, and the photovoltaic module is safely turned off when a safe broadcast signal does not exist. In short, the automatic safe shutdown method, tsunami, earthquake and other conditions, and the building or residential alternating current power grid are normal, and the method is characterized in that a cloud platform sends a signal to a central controller to control the shutdown of an inverter and a safe centralized control gateway to stop periodic safe broadcasting, namely, the remote automatic safe shutdown is carried out; when a fire disaster occurs, an alternating current power grid of a house or a building is disconnected, the inverter is stopped, the safety centralized control gateway loses power supply and stops sending safety broadcasting signals, the system enters a safety working mode, and the internet of things junction box cannot detect the safety broadcasting signals, so that safety shutdown can be realized. In the remote control mode of the cloud platform, the abnormal signal can be sent and received only when the cloud platform, the central controller and the like are on line and power is available at least; when a fire disaster occurs, the AC power grid of the house or the building is usually directly disconnected, which may be operated by the fire emergency treatment of the house or the building, and the system comprising the Internet of things junction box can also be automatically disconnected as the AC power grid is disconnected; this automatic security shutdown is more common and more important because there may be a problem of communication failure through the cloud platform control, which is a security hazard; it is critical that the system, including the complete disconnection of the components, be shut down directly by the fire fighter or owner.
In summary, the intelligent photovoltaic power generation monitoring device based on the internet of things, as shown in fig. 1 and 2, is in a safe working mode: 1) the intelligent Internet of things junction box checks a safe broadcast signal; 2) and the central control collector sends an abnormal initiating signal to the intelligent security centralized control gateway, closes the security broadcast of the intelligent security centralized control gateway and sends an abnormal removing signal to the intelligent security centralized control gateway to recover the security broadcast. As shown in fig. 3 and 4, in the normal operation mode: 1) the intelligent internet of things junction box does not check the safe broadcast signals; 2) the central control collector sends a periodic normal signal to shut down the security broadcast of the intelligent security centralized control gateway.
The central control collector and the intelligent internet of things junction box in the intelligent photovoltaic power generation monitoring device based on the internet of things have a safe working mode and a normal working mode, and are distinguished by the current of the photovoltaic string, for example, the current of the string is defined to be lower than 0.5 ampere as the safe working mode, and higher than 0.5 ampere as the normal working mode. The safe working mode takes system safety control as a first requirement, and the monitoring requirement of component data is not high or is not required; and in the normal working mode, because the system works normally, no safety problem exists, and the monitoring of component data is mainly used at the moment. In the invention, the safe working state refers to a safe working mode; the normal working state is the normal working mode.
Relates to the difference of broadcast communication and on-demand (unicast) communication of the communication mode of the Internet of things. Broadcast communication is reliable, but communication efficiency is low, and data storm or data blockage may exist; under the normal state of the system, the safety centralized control gateway stops the safety broadcasting, so that the data acquisition of the photovoltaic module is facilitated, otherwise, the acquisition efficiency is influenced by the safety broadcasting all the time. The secure broadcast is a communication mode between hosts in the internet of things, and the network copies and forwards signals sent by each host unconditionally until all hosts can receive all information (no matter whether you need or not), so that the network cannot provide personalized services according to the requirements and time of each client in time. According to the invention, the safety centralized control gateway broadcasts periodic safety broadcast signals to all the Internet of things junction boxes, and the periodic signals are automatically forwarded by each Internet of things junction box until each junction box receives the periodic safety broadcast signals. The internet of things junction box is equivalent to a router in the internet of things, the broadcast signal mainly ensures normal power generation, and data packet loss may exist due to occupation of the broadcast on a network when data acquisition is carried out at the same time.
The central control collector acquires the string current data of the intelligent photovoltaic power generation monitoring device through the power generation data of a photovoltaic inverter connected with the intelligent photovoltaic power generation monitoring device through a wired cable, when the string current parameter change is larger than or smaller than a current threshold value, the central control collector is used for operating in corresponding working modes, the working modes comprise a normal working mode and a safe working mode, particularly, when an emergency fault such as fire or earthquake occurs, the system can automatically stop the inverter, so that the photovoltaic string or photovoltaic assembly is opened, no current flows through the string, theoretically 0 ampere, however, the current sampling of the Internet of things junction box or inverter is accurate and has errors, in order to avoid the errors and prevent the wrong operation, a threshold value is defined, namely the current threshold value, such as 0.5 ampere, the specified current is greater than 0.5 ampere, and the inverter is considered to be in a normal working mode without being shut down; less than 0.5 amperes, the safe operating mode. The system detection current is greater than the threshold value of 0.5 ampere, which indicates that the inverter works normally, and at the moment, the shutdown requirement is not needed, if the internet of things junction box needs to detect a safe broadcast signal, the junction box can work, the shutdown operation can be mistakenly carried out due to data packet loss, and the reliability of the system is reduced; meanwhile, the security broadcast at the moment can occupy the network and influence the data acquisition of the component. Data transmission of data acquisition of the internet of things junction box adopts a video-on-demand (unicast) mode, and the internet of things junction box transmits the data to the security centralized control gateway. And similarly, the photovoltaic inverter can also acquire current data of the dead bank string, and the data is uploaded to the central control collector, so that the central control collector can also acquire the current working mode, namely a safe working mode or a normal working mode.
In one embodiment, the photovoltaic modules are connected in series to form a photovoltaic array, the photovoltaic array is connected to a photovoltaic inverter, when the photovoltaic inverter detects a fault, the output of the photovoltaic inverter is disconnected, the current of the photovoltaic string is reduced to 0 ampere, meanwhile, the photovoltaic inverter sends an excitation communication signal for disconnecting the remote unit inside the photovoltaic inverter, at the moment, the intelligent Internet of things junction box capable of intelligently connecting the photovoltaic module enters a safe working mode, in the safe working mode, the local sub-control module of the intelligent internet of things junction box does not receive the excitation communication signal from the remote unit, the local sub-control module of the photovoltaic module reduces the output power of the photovoltaic module by controlling the duty ratio of the main switching device of the voltage regulating circuit, so that the voltage regulating circuit outputs safe low voltage such as 0.7V, and at the moment, the series output voltage of the string consisting of 40 modules is only 40 × 0.7=28V, so that the output voltage of the series circuit can be ensured to be in a safe range.
In a typical implementation, in a building-mounted photovoltaic power generation system, the remote units of the photovoltaic inverter may be connected to the building's existing fire alarm system controller, and the photovoltaic power generation system may also be stopped from generating power when the building pulls the fire alarm, e.g., for all or part of the system, checking whether any query results indicate the closing of any or all locations in the solar array. If not, processing moves to operation return where the program ends. If so, the process moves to operation, where the program issues a command to the indicated device, which may shut down or disconnect the photovoltaic inverter. (in some cases, an additional grid disconnect device is provided external to the photovoltaic inverter, not shown here). After the photovoltaic inverter corresponding to the photovoltaic array which sends out the fire alarm is closed or disconnected, the remote unit in the photovoltaic inverter stops sending the excitation communication signal, the output current of the corresponding photovoltaic array is reduced to about 0 ampere, the intelligent internet of things junction box of the intelligent photovoltaic module enters a safe working mode, in the safe working mode, because the local sub-control module of the intelligent internet of things junction box does not receive an excitation communication signal from a remote unit of the photovoltaic inverter, the local sub-control module of the photovoltaic module can reduce the output power of the photovoltaic module by controlling the duty ratio of the main switching device of the voltage regulating circuit, so that the voltage regulating circuit can output safe low voltage such as 0.7V, and if the serial output voltage of a group string consisting of 40 intelligent modules is only 40 × 0.7=28V, the output voltage of the serial line of the photovoltaic array can be ensured to be in a safe range. Furthermore, different actions may be taken in different situations. For example, if a local fire is indicated, some or all of the intelligent photovoltaic modules of the affected area may be shut down in response to firefighter safety measures, but the rest of the system may remain operational.
In the event of an earthquake, the remote unit of the photovoltaic inverter may be connected to an existing emergency alarm system controller of the building, such as an earthquake, and the photovoltaic power generation system is stopped, all the photovoltaic inverters are stopped or disconnected according to the instruction of the alarm system controller (in some cases, an additional grid disconnection device, not shown here, is provided outside the photovoltaic inverters). The remote unit in the photovoltaic inverter stops sending the excitation communication signal, the output current of the corresponding photovoltaic array is reduced to about 0A, the intelligent internet of things junction box of the intelligent photovoltaic module enters a safe working mode, under the safe working mode, the local sub-control module of the intelligent internet of things junction box can reduce the output power of the photovoltaic module by controlling the duty ratio of a main switching device of the voltage regulating circuit because the local sub-control module does not receive the excitation communication signal from the remote unit of the photovoltaic inverter, so that the voltage regulating circuit can output safe low voltage such as 0.7V, and if the serial output voltage of a group string consisting of 40 intelligent modules at the moment is only 40 x 0.7=28V, the output voltage of the serial line of the photovoltaic array can be ensured to be in a safe range.
It should be noted that the above-mentioned embodiments are only preferred embodiments of the present invention and the technical principles used, and any changes or substitutions which can be easily conceived by those skilled in the art within the technical scope of the present invention disclosed herein should be covered within the protective scope of the present invention.

Claims (10)

1. An intelligent photovoltaic power generation monitoring device based on the Internet of things is characterized by comprising an intelligent safety centralized control gateway, a central control collector and at least one intelligent Internet of things junction box;
the intelligent internet of things junction box is configured on or externally arranged on a photovoltaic assembly in an intelligent photovoltaic power generation system based on the internet of things, and comprises a turn-off circuit module, a sub-control module and an auxiliary power supply module, wherein the auxiliary power supply module obtains power supply through the output end of the photovoltaic assembly and supplies power to the turn-off circuit module and the sub-control module, and the sub-control module controls the on and off of a switch device of the turn-off circuit module;
the sub-control module comprises an acquisition module, a processor control module, a data storage module and an Internet of things communication module, wherein the processor control module acquires current and voltage parameters of the turn-off circuit module and the temperature of the intelligent Internet of things junction box through the acquisition module; the processor control module is communicated with the intelligent safety centralized control gateway through the internet of things communication module, stores and reads data into the data storage module, and the data storage module stores a preset current threshold value, and the current data read by the processor control module and collected by the collection module are compared with the current data of the turn-off circuit module to determine the working mode of the intelligent internet of things junction box;
the sub-control module has the functions of realizing local safety control and data acquisition and the function of routing nodes of Internet of things communication, and can receive and forward data of other intelligent Internet of things junction boxes; the intelligent Internet of things junction box is used for safe turn-off and intelligent monitoring and photovoltaic power optimization; the acquisition module is used for acquiring electric signals of current and voltage parameters of the correspondingly arranged turn-off circuit;
the intelligent safety centralized control gateway is connected with the central control collector through a line, performs data interaction with the central control collector through the line, and obtains power supply from the central control collector; the intelligent safety centralized control gateway is configured around the photovoltaic module and is arranged close to the intelligent Internet of things junction box, has the functions of an Internet of things coordinator and routing, realizes internal local Internet of things networking with the intelligent Internet of things junction box through built-in coordinator software, and performs data interaction with the intelligent Internet of things junction box through an internal local Internet of things;
the central control collector is further connected with a photovoltaic inverter circuit in the intelligent photovoltaic power generation system based on the Internet of things, and the central control collector is connected with an external wide area Internet and a cloud platform through wires or wireless connection and obtains power supply from an access point behind an alternating current output end of the photovoltaic inverter.
2. The intelligent photovoltaic power generation monitoring device based on the internet of things of claim 1, wherein a local sub-control module of the intelligent internet of things junction box distinguishes working modes of the local intelligent internet of things junction box according to output current sampling of a turn-off circuit, and the working modes comprise a normal working mode and a safe working mode; the safe working mode is that the local sub-control module receives a periodic safe broadcast signal from the intelligent safe centralized control gateway, whether the periodic safe broadcast signal indication is detected within a certain time period or not and adjusts the state of the turn-off circuit, if so, the sub-control module adjusts the turn-off circuit to be in a connected state or maintains the connected state; if not, the sub-control module adjusts the turn-off circuit to be in a turn-off state or maintains the turn-off state, and the power output of the photovoltaic module is turned off; the normal working mode refers to a working mode except the safe working mode, and at the moment, the local intelligent Internet of things junction box is controlled by the local sub-control module, is not controlled by the intelligent safe centralized control gateway, and does not respond to the periodic safe broadcast signals from the intelligent safe centralized control gateway.
3. The intelligent photovoltaic power generation monitoring device based on the internet of things as claimed in claim 2, wherein the local sub-control module of the intelligent internet of things junction box collects output voltage and current parameters of a photovoltaic module and the internal temperature of the intelligent internet of things junction box and sends the output voltage and current parameters to the central control collector through the intelligent safety centralized control gateway in a video-on-demand mode.
4. The intelligent photovoltaic power generation monitoring device based on the internet of things as claimed in claim 1, wherein the central control collector obtains power through an access point between an alternating current output end of a photovoltaic inverter and a grid-connected point;
the central control collector sends a command to the intelligent safety centralized control gateway through a line to stop the periodical safety broadcast signal of the intelligent safety centralized control gateway, wherein the command is divided into a safety command and an abnormal command; the central control collector collects power generation data of the photovoltaic inverter through a connecting cable to obtain a string current parameter of the intelligent photovoltaic power generation monitoring device, when the change of the string current parameter is larger than or smaller than a current threshold value, the central control collector operates in a corresponding working mode, the working mode comprises a normal working mode and a safe working mode, the central control collector does not send periodic safety instructions to the intelligent safety centralized control gateway in the safe working mode, and at the moment, the intelligent safety centralized control gateway continuously broadcasts periodic signals to an intelligent internet of things junction box of an internal local internet of things; under a normal working mode, the central control collector sends periodic safety instructions to the intelligent safety centralized control gateway, and after the intelligent safety centralized control gateway receives the periodic safety instructions sent by the central control collector, the intelligent internet of things junction box of the internal local internet of things stops continuously broadcasting periodic safety broadcasting signals;
the abnormal instruction is that when the central control collector receives the abnormality of fire, earthquake and tsunami from the cloud platform or receives the abnormality of direct current arc discharge and wire insulation from the photovoltaic inverter, the central control collector sends an abnormal instruction to the intelligent safety centralized control gateway, and when the central control collector receives the abnormality of fire, earthquake and tsunami from the cloud platform or receives the abnormality removal of direct current arc discharge and wire insulation from the photovoltaic inverter, the central control collector sends an abnormality removal instruction to the intelligent safety centralized control gateway; after receiving the abnormity initiation instruction sent by the central control collector, the intelligent safety centralized control gateway stops continuously broadcasting the periodic safety broadcast signals to the intelligent Internet of things junction box of the internal local Internet of things until the intelligent safety centralized control gateway receives the abnormity removal instruction sent by the central control collector;
after the intelligent security centralized control gateway is powered on, continuously broadcasting periodic signals to the intelligent Internet of things junction box of the internal local Internet of things, and stopping continuously broadcasting the periodic signals to the intelligent Internet of things junction box of the internal local Internet of things until the intelligent security centralized control gateway receives the periodic security instructions sent by the central control collector; if the intelligent security centralized control gateway does not receive the periodic security instruction, the intelligent security centralized control gateway can restore to continuously broadcast periodic signals to the intelligent internet of things junction box of the internal local internet of things.
5. The intelligent photovoltaic power generation monitoring device based on the internet of things of claim 1, wherein the internet of things communication module is based on any one of Zigbee, Bluetooth MESH and LORA wireless communication protocols.
6. The intelligent photovoltaic power generation monitoring device based on the internet of things as claimed in claim 1, wherein the intelligent security centralized control gateway gets electricity through the central control collector and is powered by a two-way power supply unit inside the central control collector, wherein one way is the power supply unit of the central control collector, and the other way is a special power supply unit independent of the power supply unit of the central control collector.
7. An automatic shutdown method of an intelligent photovoltaic power generation monitoring device based on the internet of things in claim 1, which is characterized by comprising the following steps:
the remote control method comprises the steps of carrying out automatic turn-off control through a cloud platform;
the field control method comprises the step of carrying out field control after an emergency accident happens to a house or a building provided with the intelligent photovoltaic power generation monitoring device based on the Internet of things.
8. The automatic turn-off method of the intelligent photovoltaic power generation monitoring device based on the internet of things as claimed in claim 7, wherein the remote control method comprises the following steps:
the intelligent photovoltaic power generation monitoring device based on the Internet of things generates electric power through a photovoltaic cell of a photovoltaic module; in a normal working mode, the local intelligent Internet of things junction box of the photovoltaic module is controlled by the local sub-control module, is not controlled by the remote intelligent security centralized control gateway and does not respond to periodic security broadcast signals from the intelligent security centralized control gateway of the remote unit; the local sub-control module of the intelligent Internet of things junction box acquires the output voltage and current parameters of the photovoltaic module and the data of the internal temperature of the intelligent Internet of things junction box, and sends the acquired output voltage and current parameters of the photovoltaic module and the data of the internal temperature of the intelligent Internet of things junction box to the central control collector through the intelligent safety centralized control gateway in a video-on-demand mode;
when the photovoltaic inverter or the direct current combiner box monitors an abnormal condition or receives an abnormal condition notice from the cloud platform, firstly, the photovoltaic inverter or the direct current combiner box is stopped, at the moment, a series circuit formed by the output end of the photovoltaic module forms an open circuit, the current value on the series circuit is reduced to be below a preset current threshold value of a safe working mode, and the intelligent photovoltaic module based on the internet of things enters the safe working mode; meanwhile, the central control collector receives an abnormal instruction from the cloud platform, and sends an abnormal initiating instruction to the intelligent security centralized control gateway, and the intelligent security centralized control gateway stops continuously broadcasting periodic security broadcasting signals to the intelligent internet-of-things junction box of the internal local internet of things after receiving the abnormal initiating instruction sent by the central control collector; the method comprises the steps that a sub-control module of an intelligent Internet of things junction box of a photovoltaic assembly is communicated with a remote unit arranged on an intelligent safety centralized control gateway in a safety working mode, and comprises the steps of receiving periodic safety broadcast signals from the remote unit, when the sub-control module monitors the abnormity of the periodic safety broadcast signals detected from the remote unit, the abnormity of the safety broadcast signals means that the sub-control module detects that the safety broadcast signals disappear or the safety broadcast signals detected in unit time do not reach a preset number of times, the sub-control module responds to the abnormity, a turn-off circuit of the intelligent Internet of things junction box is turned off by the sub-control module to turn off the power output of the photovoltaic assembly, and the output voltage of a voltage regulator or a turn-off circuit of the intelligent Internet of things junction box is reduced to a safety value;
when the photovoltaic inverter or the direct current combiner box monitors that the abnormal condition is removed or an abnormal condition removing notice is received from the cloud platform, the photovoltaic inverter or the direct current combiner box is started up again, meanwhile, the central control collector receives an abnormal removing instruction from the cloud platform and sends an abnormal removing instruction to the intelligent security centralized control gateway, and the intelligent security centralized control gateway continuously broadcasts periodic security broadcast signals to the intelligent internet of things junction box of the internal local internet of things after receiving the abnormal removing instruction sent by the central control collector; the sub-control module of the intelligent internet of things junction box of the photovoltaic module is communicated with a remote unit arranged on an intelligent safety centralized control gateway in a safety working mode, and comprises a receiving module for receiving periodic safety broadcast signals from the remote unit, when the monitoring result shows that the periodic safety broadcast signals from the remote unit are normal, the normal safety broadcast signals mean that the sub-control module detects the safety broadcast signals of preset times in unit time, the sub-control module responds to the normal state, the sub-control module is communicated with a turn-off circuit of the intelligent internet of things junction box to recover the power output of the photovoltaic module, and the output voltage of a voltage regulator or the turn-off circuit of the intelligent internet of things junction box is recovered to a working value.
9. The automatic turn-off method of the intelligent photovoltaic power generation monitoring device based on the Internet of things as claimed in claim 7, wherein the field control method comprises the following steps:
the intelligent photovoltaic power generation monitoring device based on the Internet of things generates electric power through a photovoltaic cell of a photovoltaic module; in a normal working mode, the local intelligent Internet of things junction box of the photovoltaic module is controlled by the local sub-control module, is not controlled by the remote intelligent security centralized control gateway and does not respond to periodic safe broadcast signals from the intelligent security centralized control gateway of the remote unit; the local sub-control module of the intelligent Internet of things junction box acquires data of output voltage and current parameters of a photovoltaic module and the internal temperature of the junction box and sends the data to the central control collector through the intelligent safety centralized control gateway in a video-on-demand mode;
when a house or a building provided with the intelligent photovoltaic power generation monitoring device based on the Internet of things has an emergency accident, a house owner or a manager and a fire fighter turn off a grid-connected switch of a grid-connected point of the intelligent photovoltaic power generation monitoring device based on the Internet of things or a main grid-to-home switch of the house on site;
when the grid-connected switch of the grid-connected point or the power grid home-entry main switch is switched off, firstly, the photovoltaic inverter is shut down, at the moment, a series circuit formed by the output end of the photovoltaic module forms an open circuit, the current value on the series circuit is reduced to be below a preset current threshold value of a safe working mode, and the photovoltaic module enters the safe working mode; meanwhile, the intelligent safety centralized control gateway is shut down when power is lost, and the intelligent Internet of things junction box of the internal local Internet of things is stopped from continuously broadcasting periodic safety broadcasting signals; the method comprises the steps that a sub-control module of an intelligent Internet of things junction box of a photovoltaic assembly is communicated with a remote unit arranged on an intelligent safety centralized control gateway in a safety working mode, and comprises the steps of receiving periodic safety broadcast signals from the remote unit, when the sub-control module monitors the abnormity of the periodic safety broadcast signals detected from the remote unit, the abnormity of the safety broadcast signals means that the sub-control module detects that the safety broadcast signals disappear or the safety broadcast signals detected in unit time do not reach a preset number of times, the sub-control module responds to the abnormity, a turn-off circuit of the intelligent Internet of things junction box is turned off by the sub-control module to turn off the power output of the photovoltaic assembly, and the output voltage of a voltage regulator or a turn-off circuit of the intelligent Internet of things junction box is reduced to a safety value;
when the emergency accident is relieved, the residential owner or manager and the fire fighter can be connected with the grid-connected switch of the grid-connected point of the intelligent photovoltaic power generation monitoring device based on the internet of things or the residential power grid-to-home master switch of the residence in a field recovery manner;
firstly, the photovoltaic inverter or the direct current combiner box is recovered to be started, and the intelligent security centralized control gateway continuously broadcasts periodic security broadcast signals to an intelligent Internet of things junction box of an internal local Internet of things; the sub-control module of the intelligent internet of things junction box of the photovoltaic module is communicated with a remote unit arranged on an intelligent safety centralized control gateway in a safety working mode, and comprises a receiving module for receiving periodic safety broadcast signals from the remote unit, when the monitoring result shows that the periodic safety broadcast signals from the remote unit are normal, the normal safety broadcast signals mean that the sub-control module detects the safety broadcast signals of preset times in unit time, the sub-control module responds to the normal state, the sub-control module is communicated with a turn-off circuit of the intelligent internet of things junction box to recover the power output of the photovoltaic module, and the output voltage of a voltage regulator or the turn-off circuit of the intelligent internet of things junction box is recovered to a working value.
10. The automatic shutdown method for the intelligent photovoltaic power generation monitoring device based on the internet of things as claimed in claim 8 or 9, wherein the central control collector is distinguished from the intelligent internet of things junction box in corresponding working modes, namely a normal working mode and a safe working mode, or distinguished by string power of a photovoltaic string connected to the photovoltaic inverter or photovoltaic module power connected to the intelligent internet of things junction box.
CN202210297737.9A 2022-03-25 2022-03-25 Intelligent photovoltaic power generation monitoring device based on Internet of things and automatic turn-off method Active CN114400791B (en)

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