CN113972746B - Low-voltage grid-connected distributed photovoltaic observation and control method and device - Google Patents

Low-voltage grid-connected distributed photovoltaic observation and control method and device Download PDF

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Publication number
CN113972746B
CN113972746B CN202111389293.3A CN202111389293A CN113972746B CN 113972746 B CN113972746 B CN 113972746B CN 202111389293 A CN202111389293 A CN 202111389293A CN 113972746 B CN113972746 B CN 113972746B
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China
Prior art keywords
photovoltaic
distributed photovoltaic
voltage
low
power generation
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CN202111389293.3A
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CN113972746A (en
Inventor
孙庆恭
危阜胜
马棉涛
蔡洁锐
黎海生
张宇婷
连国聪
李健
彭东炎
廖小毅
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Guangdong Power Grid Co Ltd
Shanwei Power Supply Bureau of Guangdong Power Grid Co Ltd
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Guangdong Power Grid Co Ltd
Shanwei Power Supply Bureau of Guangdong Power Grid Co Ltd
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Priority to CN202111389293.3A priority Critical patent/CN113972746B/en
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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
    • H02J13/00001—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 the display of information or by user interaction, e.g. supervisory control and data acquisition systems [SCADA] or graphical user interfaces [GUI]
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
    • H02J13/00002—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by monitoring
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
    • H02J13/00006—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment
    • H02J13/00007—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment using the power network as support for the transmission
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
    • H02J13/00006—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
    • H02J13/00028—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
    • H02J3/003—Load forecast, e.g. methods or systems for forecasting future load demand
    • 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
    • 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
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B10/00—Integration of renewable energy sources in buildings
    • Y02B10/10—Photovoltaic [PV]
    • 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
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02B90/20—Smart grids as enabling technology in buildings 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
    • 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
    • Y04S40/121—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment using the power network as support for the transmission
    • 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
    • Y04S40/124—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 wired telecommunication networks or data transmission busses

Abstract

The invention provides a low-voltage grid-connected distributed photovoltaic observation and control method and device, which relate to the technical field of photovoltaic observation and control and comprise the following steps: s1, data acquisition: collecting low-voltage grid-connected distributed photovoltaic internal data by the collecting terminal; s2, remote monitoring: and remotely monitoring data in the low-voltage distributed photovoltaic power generation system. The protocol type of the interactive inverter can be automatically identified by the photovoltaic protocol converter through the protocol self-adaptive identification function, corresponding data is obtained through analysis, a standard message is generated, the recovery acquisition terminal is ready to use after being assembled, debugging is not needed, the field maintenance workload is greatly reduced, the photovoltaic protocol converter supports simultaneous reading with the owner acquisition equipment, serial port scheduling is realized through program control, and the data acquisition of the photovoltaic protocol converter is realized under the condition that the reading work of the owner data acquisition equipment is not influenced by mechanisms such as channel monitoring, channel avoidance and delay recovery.

Description

Low-voltage grid-connected distributed photovoltaic observation and control method and device
Technical Field
The invention relates to the technical field of photovoltaic observation control, in particular to a low-voltage grid-connected distributed photovoltaic observation and control method and device.
Background
According to the requirement of the electric energy meter of the low-voltage distributed photovoltaic power generation system connected into a 380 (220) V power grid at present, the system meets the technical specification of the electric energy meter related to the south power grid, has the functions of bidirectional metering, time-sharing metering, electric quantity freezing and the like, supports carrier waves, RS485 and wireless multiple communication modes, adapts to data acquisition requirements under different use environments, uploads electric energy meter data to a Guangdong power grid metering automation system through a low-voltage centralized meter-reading system concentrator deployed in a platform area, achieves the forward and reverse metering function, the time-sharing metering function and the whole-point electric quantity freezing function, has the functions of current, voltage, power and power factor measurement and display, and can timely feed back acquired information to project owners through a customer service system besides meeting the requirements of settlement electric charges and management of power grid companies.
On the basis of analyzing the power grid bearing capacity, the large-scale propulsion of the roof distributed photovoltaic in the whole county (city and district) requires that each electric power grid enterprise be matched with a provincial power planning and trial-site county construction scheme, the requirement of large-scale access of the distributed photovoltaic is fully considered, the power grid planning of the relevant county is actively made, the construction transformation of the power distribution network of the county (city and district) is enhanced, the service, regulation and control and operation management of the roof distributed photovoltaic are made, and the power grid company provides the following requirements for a low-voltage distributed photovoltaic power generation system: (1) considerable: establishing a low-voltage distributed photovoltaic operation monitoring system, and realizing on-line monitoring of the operation states of equipment such as an intelligent electric energy meter, an intelligent circuit breaker, an anti-islanding device, a photovoltaic inverter and the like in a transformer area; (2) measurable: the 15-minute-level load data acquisition is realized through the full coverage of the low-voltage distributed photovoltaic high-frequency acquisition communication, the 5-minute-level data acquisition is realized for important photovoltaic users and key data, the 1-minute-level data acquisition is explored by test points, and the accurate daily load prediction of the low-voltage distributed photovoltaic power generation load is realized through the data analysis; (3) controllable: different control strategies are formulated through considerable and measurable data, grid-connected off-grid remote real-time control is achieved, and flexible adjustment of active power, reactive power and voltage output of photovoltaic power generation can be achieved through extension acquisition control of a photovoltaic inverter.
Compared with the remote monitoring capability of a low-voltage distributed photovoltaic power generation system realized by the metering automation system deployed at present, the requirements on the type of monitoring equipment, the type and frequency of data acquisition and the control capability are far insufficient.
Disclosure of Invention
The invention provides a low-voltage grid-connected distributed photovoltaic observation and control method and device. The protocol type of the interactive inverter can be automatically identified through the photovoltaic protocol converter by using a protocol self-adaptive identification function, the protocol type of the interactive inverter is automatically identified, the 698 protocol issued by the acquisition terminal is automatically converted into the modbus protocol corresponding to the register address and issued to the inverter according to the identified protocol, when the inverter replies, corresponding data is obtained according to the replied modbus message, and the standard 698 message is automatically generated, the acquisition terminal is replied, the communication is completed, the installation is completed, the debugging is not needed, the field maintenance workload is greatly reduced, when the remote monitoring system built by a distributed photovoltaic power generation system owner directly reads the inverter, the photovoltaic protocol converter supports the simultaneous reading with the owner acquisition equipment, the photovoltaic protocol converter realizes 485 serial port scheduling through a mechanism of channel monitoring, channel avoidance, delayed reply and the like, and under the condition that the reading work of the owner data acquisition equipment is not influenced, the low-voltage distributed photovoltaic power generation system can be realized in the whole method, and the low-voltage distributed power generation scale development can be realized.
In order to realize the problem of easy installation and observation and reading active avoidance, the low-voltage grid-connected distributed photovoltaic observation and control method comprises the following steps:
step one, data acquisition: collecting low-voltage grid-connected distributed photovoltaic internal data by the collecting terminal;
step two, remote monitoring: remotely monitoring data in the low-voltage distributed photovoltaic power generation system;
step three, load prediction and flexibility adjustment: carrying out corresponding daily load prediction and proper flexible adjustment on the low-voltage distributed photovoltaic power generation;
Step four, inversion analysis communication: data analysis is carried out according to the standard, and the whole set of communication flow is completed;
fifthly, system control: the method comprises the steps of controlling the opening and closing of a distributed photovoltaic power generation system;
step six, user self-monitoring: and the user equipment is connected into the distributed photovoltaic power generation system to realize remote monitoring of owner construction.
Further, in the first step, the uplink of the acquisition terminal communicates with the master station through 4G, and the downlink communicates with the intelligent electric energy meter through HPLC (broadband power line carrier) and the DL698 protocol and the photovoltaic protocol converter by adopting DL645 protocol.
Further, in the second step, the collection terminal collects and forwards the data of the electric energy meter through the high frequency of the minute level to realize the remote monitoring of the bidirectional active electric energy, reactive electric energy, current, voltage, power factor and electric energy quality of the low-voltage distributed photovoltaic power generation system, and the collection terminal collects and forwards the states of the intelligent circuit breaker, the anti-islanding device and the photovoltaic inverter to realize the remote monitoring of the grid-connected state of the low-voltage distributed photovoltaic power generation system.
Furthermore, in the third step, the load prediction is realized by analyzing high-frequency acquisition electric energy and power data of minute level by the acquisition master station, so that the accurate daily load prediction of the low-voltage distributed photovoltaic power generation load is realized.
Furthermore, in the third step, the collection terminal is connected with the photovoltaic inverter through the photovoltaic protocol converter to realize flexible adjustment of active power, reactive power and voltage output of the distributed photovoltaic power generation system, and the active power output and the power factor of the distributed photovoltaic power generation system can be adjusted according to the power grid dispatching mechanism instruction forwarded by the collection main station when necessary, and the reactive power output is adjusted according to the voltage level of the grid-connected point within the reactive power output range of the inverter, so as to participate in power grid voltage adjustment, and the adjustment mode, the reference voltage, the voltage difference adjustment rate and other parameters can be given by the power grid dispatching mechanism.
Further, after the photovoltaic protocol converter receives the DL698 standard message issued by the acquisition terminal in the fourth step, the data item is analyzed, and a modbus message corresponding to the data item of the low-voltage distributed photovoltaic power generation system is automatically converted and generated to be communicated with the inverter.
Further, in the fourth step, the modbus message replied by the inverter is parsed by the photovoltaic protocol converter, a corresponding DL698 standard format message is generated, and is replied to the acquisition terminal through the uplink HPLC/RS-485, and finally, the acquisition terminal reports the modbus message to the master station, so that the whole set of communication flow is completed.
In the fifth step, the intelligent circuit breaker is controlled by the acquisition terminal and the intelligent electric energy meter to start and stop the distributed photovoltaic power generation system according to the instruction of the power grid dispatching mechanism.
In the sixth step, the owner can access the distributed photovoltaic power generation system through the photovoltaic protocol converter, and the owner's 4G data collector is connected with the distributed photovoltaic power generation system through the RS485 to realize one generation and two collection of data, and the owner's 4G data collector can also be directly accessed to the inverter.
A low voltage grid-connected distributed photovoltaic viewing control device comprising: the photovoltaic protocol converter comprises an acquisition terminal and a photovoltaic protocol converter, wherein a control key is arranged on one side of the outer surface of the acquisition terminal close to the top edge, a display screen is arranged on one side of the outer surface of the acquisition terminal close to the top edge, a single display lamp is arranged on one side of the outer surface of the acquisition terminal close to the center, two connecting ports are arranged on one side of the outer surface of the acquisition terminal close to the bottom edge, an indication window is arranged on the top of one side of the outer surface of the photovoltaic protocol converter, an identification area is arranged on the center of one side of the outer surface of the photovoltaic protocol converter, and a wiring port is arranged on the bottom of one side of the outer surface of the photovoltaic protocol converter.
The invention provides a low-voltage grid-connected distributed photovoltaic observation and control method and device, which have the following beneficial effects: the protocol type of the interactive inverter can be automatically identified through the photovoltaic protocol converter by using a protocol self-adaptive identification function, the protocol type of the interactive inverter is automatically identified, the 698 protocol issued by the acquisition terminal is automatically converted into the modbus protocol corresponding to the register address and issued to the inverter according to the identified protocol, when the inverter replies, corresponding data is obtained according to the replied modbus message, and the standard 698 message is automatically generated, the acquisition terminal is replied, the communication is completed, the installation is completed, the debugging is not needed, the field maintenance workload is greatly reduced, when the remote monitoring system built by a distributed photovoltaic power generation system owner directly reads the inverter, the photovoltaic protocol converter supports the simultaneous reading with the owner acquisition equipment, the photovoltaic protocol converter realizes 485 serial port scheduling through a mechanism of channel monitoring, channel avoidance, delayed reply and the like, and under the condition that the reading work of the owner data acquisition equipment is not influenced, the low-voltage distributed photovoltaic power generation system can be realized in the whole method, and the low-voltage distributed power generation scale development can be realized.
Drawings
The invention is described in further detail below with reference to the drawings and examples.
FIG. 1 is a flow chart of a low-voltage grid-connected distributed photovoltaic observation and control method and device of the invention;
FIG. 2 is a perspective view of an acquisition terminal of a low-voltage grid-connected distributed photovoltaic observation and control method and device of the invention;
FIG. 3 is a perspective view of a photovoltaic protocol converter of a low-voltage grid-connected distributed photovoltaic observation and control method and device of the present invention;
FIG. 4 is a schematic diagram of a read active avoidance mechanism of a photovoltaic protocol converter of the low-voltage grid-connected distributed photovoltaic observation and control method and device;
Fig. 5 is a flow chart of supporting multi-inverter manufacturer protocol adaptation by a photovoltaic protocol converter of the low-voltage grid-connected distributed photovoltaic observation and control method and device.
In the figure:
1. a collecting terminal; 2. a control key; 3. a display screen; 4. a single display lamp; 5. a connection port; 6. a photovoltaic protocol converter; 7. an indication window; 8. a logo area; 9. and a wiring port.
Detailed Description
In order to make the technical problems solved by the present invention, the technical solutions adopted and the technical effects achieved more clear, the technical solutions of the embodiments of the present invention will be described in further detail below with reference to the accompanying drawings, and it is obvious that the described embodiments are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to fall within the scope of the invention.
Referring to fig. 1, the present invention provides a technical solution: a low-voltage grid-connected distributed photovoltaic observation and control method comprises the following steps:
step one, data acquisition: collecting low-voltage grid-connected distributed photovoltaic internal data by the collecting terminal;
step two, remote monitoring: remotely monitoring data in the low-voltage distributed photovoltaic power generation system;
step three, load prediction and flexibility adjustment: carrying out corresponding daily load prediction and proper flexible adjustment on the low-voltage distributed photovoltaic power generation;
Step four, inversion analysis communication: data analysis is carried out according to the standard, and the whole set of communication flow is completed;
fifthly, system control: the method comprises the steps of controlling the opening and closing of a distributed photovoltaic power generation system;
step six, user self-monitoring: and the user equipment is connected into the distributed photovoltaic power generation system to realize remote monitoring of owner construction.
Specifically, in the first step, the uplink of the acquisition terminal communicates with the master station through 4G, the downlink communicates with the intelligent electric energy meter through HPLC (broadband power line carrier) by using DL645 protocol and with the photovoltaic protocol converter by using DL698 protocol.
Specifically, in the second step, the collection terminal collects and forwards the data of the electric energy meter through the high frequency of the minute level to realize the remote monitoring of the bidirectional active electric energy, reactive electric energy, current, voltage, power factor and electric energy quality of the low-voltage distributed photovoltaic power generation system, and the collection terminal simultaneously collects and forwards the states of the intelligent circuit breaker, the anti-islanding device and the photovoltaic inverter to realize the remote monitoring of the grid-connected state of the low-voltage distributed photovoltaic power generation system.
Specifically, in the third step, load prediction is mainly realized by analyzing high-frequency acquisition electric energy and power data of a minute level by the acquisition master station, so that accurate daily load prediction of low-voltage distributed photovoltaic power generation load is realized.
Specifically, in the third step, the acquisition terminal is connected with the photovoltaic inverter through the photovoltaic protocol converter to realize flexible adjustment of active power, reactive power and voltage output of the distributed photovoltaic power generation system, and the active power output and the power factor of the distributed photovoltaic power generation system can be adjusted according to the power grid dispatching mechanism instruction forwarded by the acquisition master station when necessary, and the reactive power output is adjusted according to the voltage level of the grid-connected point within the reactive power output range of the inverter, so as to participate in power grid voltage adjustment, and the adjustment mode, the parameters such as reference voltage, voltage regulation rate and the like can be given by the power grid dispatching mechanism.
In the step four, the photovoltaic protocol converter analyzes the data item after receiving the DL698 standard message issued by the acquisition terminal, automatically converts and generates a modbus message corresponding to the data item of the low-voltage distributed photovoltaic power generation system, and communicates with the inverter.
Specifically, in the fourth step, the modbus message replied by the inverter is parsed by the photovoltaic protocol converter, a corresponding DL698 standard format message is generated, the modbus message is replied to the acquisition terminal through the uplink HPLC/RS-485, and finally the modbus message is reported to the master station by the acquisition terminal, so that the whole set of communication flow is completed.
In the fifth step, the intelligent circuit breaker is controlled through the acquisition terminal and the intelligent electric energy meter to start and stop the distributed photovoltaic power generation system according to the instruction of the power grid dispatching mechanism.
Specifically, in the sixth step, the owner can access the distributed photovoltaic power generation system through the photovoltaic protocol converter, and the owner's 4G data collector is connected with the distributed photovoltaic power generation system through the RS485 to realize one-time and two-time data collection, and the owner's 4G data collector can also directly access the inverter.
A low voltage grid-connected distributed photovoltaic viewing control device comprising: the photovoltaic power generation system comprises an acquisition terminal 1 and a photovoltaic protocol converter 6, wherein a control key 2 is installed and arranged at the position, close to the top edge, of one side of the outer surface of the acquisition terminal 1, a display screen 3 is installed and arranged at the position, close to the top edge, of one side of the outer surface of the acquisition terminal 1, a single display lamp 4 is installed and arranged at the position, close to the center, of one side of the outer surface of the acquisition terminal 1, two connecting ports 6 are installed and arranged at the position, close to the bottom edge, of one side of the outer surface of the acquisition terminal 1, an indication window 7 is installed and arranged at the top of one side of the outer surface of the photovoltaic protocol converter 6, an identification area 8 is installed and arranged at the center of one side of the outer surface of the photovoltaic protocol converter 6, and a wiring port 9 is arranged at the bottom of one side of the outer surface of the photovoltaic protocol converter 6.
The method of the examples was tested and compared with the prior art to obtain the following data:
Observability of Copy-reading avoidance
Examples Higher height Preferably, it is
Prior Art Lower level Poor quality
According to the table data, when the embodiment is used, the protocol self-adaptive identification function can be used by the photovoltaic protocol converter to complete communication, and the data acquisition of the photovoltaic protocol converter is realized under the condition that the reading work of the owner data acquisition equipment is not influenced by mechanisms such as channel monitoring, channel avoidance, delay recovery and the like.
The invention provides a low-voltage grid-connected distributed photovoltaic observation and control method, which comprises the following steps: step one, data acquisition: the method comprises the steps that the acquisition terminal acquires low-voltage grid-connected distributed photovoltaic internal data, the uplink of the acquisition terminal is communicated with a master station through 4G, the downlink of the acquisition terminal is communicated with a photovoltaic protocol converter through an HPLC (broadband power line carrier), a DL645 protocol is adopted to be communicated with an intelligent electric energy meter, a DL698 protocol is adopted to be used for data acquisition and control of an inverter, remote upgrading is included, an edge processing function is provided, a user property boundary part is provided, 4G/5G communication is supported in the uplink, an HPLC interface is adapted in the downlink, a protocol converter is adapted, the protocol types of photovoltaic inverter manufacturers are multiple, the interface forms are multiple, the photovoltaic inverter CAN convert variable direct current voltage generated by a photovoltaic solar panel into an inverter with alternating current with commercial frequency, the inverter CAN be fed back to a commercial power transmission system, or used for a power grid of a grid, the photovoltaic inverter is one of important system balance in a photovoltaic array system, the photovoltaic inverter CAN be used with general alternating current power supply equipment, the photovoltaic protocol converter supports HPLC/485 communication in the uplink, the downlink is adapted to RS-485, a BURS, an M-698 protocol is adapted, and the protocol is converted to be remote, and a protocol monitoring mode is supported by the two-BUS is adopted, and the protocol monitoring is monitored in the two steps. The method comprises the steps that data in a low-voltage distributed photovoltaic power generation system are remotely monitored, data of an electric energy meter are collected and forwarded through high frequency of a minute level by an acquisition terminal, the bidirectional active electric energy, reactive electric energy, current, voltage, power factor and electric energy quality of the low-voltage distributed photovoltaic power generation system are remotely monitored, the acquisition terminal simultaneously collects and forwards an intelligent circuit breaker, an anti-island device and a photovoltaic inverter state, the grid-connected state of the low-voltage distributed photovoltaic power generation system is remotely monitored, and the three steps of load prediction and flexible adjustment are carried out: the method comprises the following steps that corresponding daily load prediction and proper flexible adjustment are carried out on low-voltage distributed photovoltaic power generation, load prediction mainly realizes accurate daily load prediction of the low-voltage distributed photovoltaic power generation load through analysis of high-frequency acquisition electric energy and power data of a minute level by an acquisition master station, the acquisition terminal is connected with a photovoltaic inverter through a photovoltaic protocol converter to realize flexible adjustment of active power, reactive power and voltage output of a distributed photovoltaic power generation system, the active power output and the power factor of the distributed photovoltaic power generation system can be adjusted according to a power grid dispatching mechanism instruction forwarded by the acquisition master station when necessary, reactive power output is adjusted according to a voltage level of a grid-connected point in a reactive power output range of an inverter, the reactive power output is participated in power grid voltage adjustment, parameters such as an adjustment mode, reference voltage, voltage differential rate and the like can be given by a power grid dispatching mechanism, and the steps four and inversion analysis communication: after the photovoltaic protocol converter receives the DL698 standard message issued by the acquisition terminal, analyzing the data item, automatically converting and generating a modbus message corresponding to the data item of the low-voltage distributed photovoltaic power generation system, communicating with the inverter, analyzing the modbus message replied by the inverter by the photovoltaic protocol converter, generating a corresponding DL698 standard format message, replying to the acquisition terminal through an uplink HPLC/RS-485, and finally reporting to the master station by the acquisition terminal to complete the whole communication process, wherein the DL698 is object-oriented, the related data and the related method are combined into a whole to be treated, and the object-oriented is the process-oriented opposite to the process-oriented: the data and method are separated, object-oriented, there must be class and object, interface class belongs to one of abstract classes, interface class has private attribute and private method, interface class is identified by identification code (class-id) in protocol, object identification system OI, this protocol adopts two forms of direct reference and indirect reference when referring to one object, when only one object instance exists under the unique name of such object, direct reference adopts the mode of direct reference, indirect reference uses GetRequestRecord service indirect reference, similar to daily freezing, X axis represents active power (forward, backward), Y axis is a day to specify needed object, this is adopting indirect reference mechanism, there is a more important concept that is pre-connection, there is a pre-established application connection above pre-connection, this connection meets the minimum acquisition application requirement, pre-connection is unbreakable, there is pre-connection application layer service (Get service) that can be initiated directly, modbus is a communication protocol, it is communication protocol for communication using Programmable Logic Controller (PLC), the standard of industrial control system is a serial control system between five general-purpose steps, PLC (De facto, current industry control system is commonly used in the five fields: the distributed photovoltaic power generation system is controlled to be started and closed, the intelligent circuit breaker is controlled through the acquisition terminal and the intelligent electric energy meter, the distributed photovoltaic power generation system is started and stopped according to the instruction of the power grid dispatching mechanism, and step six, the user monitors automatically: the user equipment is connected with the distributed photovoltaic power generation system to realize remote monitoring of construction of owners, the owners can be connected with the distributed photovoltaic power generation system through the photovoltaic protocol converter, the 4G data acquisition device is connected with the distributed photovoltaic power generation system through the RS485 to realize one generation and two collection of data, and the 4G data acquisition device of the owners can also be directly connected with the inverter.
In this embodiment: a low voltage grid-connected distributed photovoltaic viewing control device comprising: the intelligent monitoring system comprises an acquisition terminal 1 and a photovoltaic protocol converter 6, wherein a control key 2 is arranged at the position, close to the top edge, of one side of the outer surface of the acquisition terminal 1, a display screen 3 is arranged at the position, close to the top edge, of one side of the outer surface of the acquisition terminal 1, a single display lamp 4 is arranged at the position, close to the center, of one side of the outer surface of the acquisition terminal 1, two connection ports 6 are arranged at the position, close to the bottom edge, of one side of the outer surface of the photovoltaic protocol converter 6, an indication window 7 is arranged at the top, an identification area 8 is arranged at the center of one side of the outer surface of the photovoltaic protocol converter 6, a wiring port 9 is arranged at the bottom of one side of the outer surface of the photovoltaic protocol converter 6, the acquisition terminal 1 is cuboid-shaped, conversion of user property rights CAN be controlled through the control key 2 and CAN be displayed by the display screen 3, people CAN conveniently check the display property rights of the single display lamp 4, the connection ports 5 are more convenient due to multiple types of manufacturer protocols, the photovoltaic protocol converter 6 supports HPLC/RS485 communication in an upward mode, interfaces are downward adaptive to RS-485, bluetooth, CAN BUS, M-BUS interface 698 and the like interfaces support mode interfaces, the mode of the communication protocols CAN be used in the mode, and the mode of the interface CAN be used for viewing the communication with the interface 7 and the interface.
The foregoing is merely exemplary of the present invention, and those skilled in the art should not be considered as limiting the invention, since modifications may be made in the specific embodiments and application scope of the invention in light of the teachings of the present invention.

Claims (8)

1. The low-voltage grid-connected distributed photovoltaic observation and control method is characterized by comprising the following steps of:
s1, data acquisition: collecting low-voltage grid-connected distributed photovoltaic internal data by the collecting terminal;
s2, remote monitoring: remotely monitoring data in the low-voltage distributed photovoltaic power generation system;
S3, load prediction and flexibility adjustment: carrying out corresponding daily load prediction and proper flexible adjustment on the low-voltage distributed photovoltaic power generation;
S4, inversion analysis communication: data analysis is carried out according to the standard, and the whole set of communication flow is completed;
S5, system control: the method comprises the steps of controlling the opening and closing of a distributed photovoltaic power generation system;
S6, user self-monitoring: the user equipment is connected to the distributed photovoltaic power generation system to realize remote monitoring of owner construction;
After the photovoltaic protocol converter receives the DL698 standard message issued by the acquisition terminal in the step S4, analyzing the data item, automatically converting and generating a modbus message corresponding to the data item of the low-voltage distributed photovoltaic power generation system, and communicating with the inverter;
In the step S4, the modbus message replied by the inverter is analyzed by the photovoltaic protocol converter, a corresponding DL698 standard format message is generated, the modbus message is replied to the acquisition terminal through the uplink HPLC/RS-485, and finally the modbus message is reported to the master station by the acquisition terminal, so that the whole set of communication flow is completed.
2. The method for low-voltage grid-connected distributed photovoltaic observation and control according to claim 1, wherein in step S1, the acquisition terminal communicates with the master station via 4G upstream and communicates with the intelligent ammeter via DL645 protocol and the photovoltaic protocol converter via DL698 protocol downstream via HPLC (broadband power line carrier).
3. The method for measuring and controlling the low-voltage grid-connected distributed photovoltaic observation according to claim 2, wherein in the step S2, the acquisition terminal acquires and forwards electric energy meter data through high frequency of a minute level to realize remote monitoring of bidirectional active electric energy, reactive electric energy, current, voltage, power factor and electric energy quality of the low-voltage distributed photovoltaic power generation system, and the acquisition terminal simultaneously acquires and forwards the states of an intelligent circuit breaker, an anti-islanding device and a photovoltaic inverter to realize remote monitoring of the grid-connected state of the low-voltage distributed photovoltaic power generation system.
4. The method for measuring and controlling low-voltage grid-connected distributed photovoltaic observation according to claim 3, wherein in the step S3, the load prediction realizes accurate daily load prediction of low-voltage distributed photovoltaic power generation load through high-frequency acquisition electric energy and power data analysis of a minute level by an acquisition master station.
5. The method for measuring and controlling the low-voltage grid-connected distributed photovoltaic observation according to claim 4, wherein in the step S3, the acquisition terminal is connected with the photovoltaic inverter through the photovoltaic protocol converter to realize flexible adjustment of active power, reactive power and voltage output of the distributed photovoltaic power generation system, the active power output and the power factor of the distributed photovoltaic power generation system are adjusted according to the power grid dispatching mechanism instruction forwarded by the acquisition master station, and the reactive power output of the inverter is adjusted according to the voltage level of a grid-connected point within the reactive power output range of the inverter, and the adjustment mode, the reference voltage and the voltage difference adjustment rate parameters of the distributed photovoltaic power generation system are set by the power grid dispatching mechanism.
6. The low-voltage grid-connected distributed photovoltaic observation and control method according to claim 1, wherein in step S5, an intelligent breaker is controlled by the acquisition terminal and the intelligent electric energy meter to start and stop a distributed photovoltaic power generation system according to the instruction of a power grid dispatching mechanism.
7. The method for low-voltage grid-connected distributed photovoltaic observation and control according to claim 6, wherein in step S6, the owner accesses the distributed photovoltaic power generation system through a photovoltaic protocol converter, realizes one-generation and two-generation of data by connecting the owner with the 4G data collector through RS485, and the owner' S4G data collector is directly accessed to the inverter.
8. A low-voltage grid-connected distributed photovoltaic observation and control device, which is characterized by being applied to the low-voltage grid-connected distributed photovoltaic observation and control method according to any one of claims 1-7, comprising: acquisition terminal (1) and photovoltaic protocol converter (6), its characterized in that, the surface one side of acquisition terminal (1) is close to top edge department and installs and be provided with control button (2), the surface one side of acquisition terminal (1) is close to top edge department and installs and be provided with display screen (3), the surface one side of acquisition terminal (1) is close to center department and installs and be provided with single display lamp (4), the surface one side of acquisition terminal (1) is close to bottom edge department and installs and be provided with two connector ports (5), the surface one side top department of photovoltaic protocol converter (6) installs and is provided with instruction window (7), the surface one side center department of photovoltaic protocol converter (6) installs and is provided with identification zone (8), the surface one side bottom department of photovoltaic protocol converter (6) is provided with wiring mouth (9).
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