CN116231870A - Low-voltage distributed photovoltaic user inverter information mapping terminal, system and method - Google Patents
Low-voltage distributed photovoltaic user inverter information mapping terminal, system and method Download PDFInfo
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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
- H02J13/00002—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
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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
- H02J13/00007—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
- H02J13/00009—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 using pulsed signals
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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
- H02J13/00022—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
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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
- 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
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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
- 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
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- 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
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- 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
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Abstract
The invention discloses a low-voltage distributed photovoltaic user inverter information mapping terminal, a system and a method, wherein the current mapping terminal comprises the following components: a first port in the communication ports is respectively in communication connection with the intelligent electric energy meter and a data output port of the photovoltaic inverter, and a second port in the communication ports is in communication connection with the photovoltaic automatic reclosing circuit breaker; the third port of the mapping terminal is in communication connection with the inverter remote terminal, and the inverter remote terminal is in communication connection with a background master station of the distributed photovoltaic power station; a voltage sampling port of the mapping terminal receives a voltage signal on a line between the photovoltaic inverter and the protection circuit breaker; a current sampling port of the mapping terminal receives a current signal on a line between the photovoltaic inverter and the protection circuit breaker; the power port is connected to an isolating switch between the distributed photovoltaic power station and the power grid to take electricity from the isolating switch. By applying the embodiment of the invention, the timeliness of information reporting and control can be improved.
Description
Technical Field
The invention relates to the technical field of distributed photovoltaic power generation measurement and control, in particular to a low-voltage distributed photovoltaic user inverter information mapping terminal, a system and a method.
Background
The distributed photovoltaic power generation is a photovoltaic power generation facility which is built nearby a user site, is operated in a self-power-consumption and redundant electric quantity network surfing mode at the user side and is characterized by balance adjustment of a power distribution system. The distributed photovoltaic advocates the principle of nearby power generation, nearby grid connection, nearby conversion and nearby use, so that the generating capacity of the photovoltaic power station with the same scale can be effectively improved, and meanwhile, the problem of power loss in boosting and long-distance transportation can be avoided to a great extent. Although the distributed photovoltaic power generation system has the advantages, the distributed photovoltaic power generation system has the characteristic of high dispersion, and the technical problem to be solved is that how to collect the state information of each distributed power station timely, generate corresponding control instructions according to the state information of the distributed power station, and further realize the control of the distributed power station, wherein how to collect the information of the distributed photovoltaic system efficiently is a very core problem.
The prior art uses a communication acquisition system and an acquisition method of a photovoltaic inverter similar to the application number 202210889384.1, wherein the system comprises a communication acquisition unit, a dispatching automation platform and the photovoltaic inverter; the photovoltaic inverter is used for acquiring telemetry data, remote signaling data and remote regulation data of inverters of different manufacturers and transmitting the telemetry data, the remote signaling data and the remote regulation data to the communication acquisition unit; the communication acquisition unit converts the photovoltaic inversion protocol of different manufacturers into a unified photovoltaic acquisition protocol, and then sends telemetry data, remote signaling data and remote regulation data of the inverters of different manufacturers to the dispatching automation platform; the dispatching automation platform is used for obtaining remote control and power regulation operation of the inverters according to the remote measurement data, the remote signaling data and the remote regulation data of the inverters of different manufacturers, and sending the remote control and power regulation operation to each inverter through the communication acquisition unit. Based on the system, a communication acquisition method of the photovoltaic inverter is also provided. The invention realizes unified access of various inverters, reduces operation and maintenance difficulty and operation and maintenance cost, and generates remarkable economic benefit.
However, in the prior art, unified receiving and transmitting of information is realized based on communication acquisition units in all distributed photovoltaic power stations, the communication acquisition units are required to acquire data from an inverter, the data are summarized to signal receiving and transmitting equipment, and then the data are transmitted to a dispatching automation platform by the signal receiving and transmitting equipment, so that timeliness of information reporting and control is poor due to more links.
Disclosure of Invention
The technical problem to be solved by the invention is how to simplify the structure in the distributed power station so as to improve the timeliness of information reporting and control.
The invention solves the technical problems through the following technical scheme:
the invention provides a low-voltage distributed photovoltaic user inverter information mapping terminal, which comprises: a communication port, a voltage sampling port, a current sampling port, a power port and an antenna, wherein,
the first port of the communication port is respectively in communication connection with the intelligent electric energy meter and the data output port of the photovoltaic inverter, and the second port of the communication port is in communication connection with the photovoltaic automatic reclosing circuit breaker;
the third port of the current mapping terminal is in communication connection with the remote terminal of the inverter, and the remote terminal of the inverter is in communication connection with the background master station of the distributed photovoltaic power station;
a voltage sampling port of the current mapping terminal receives a voltage signal on a line between a photovoltaic inverter and a protection circuit breaker;
a current sampling port of the current mapping terminal receives a current signal on a line between the photovoltaic inverter and the protection circuit breaker;
the power port is connected to an isolating switch between the distributed photovoltaic power station and the power grid to take electricity from the isolating switch and realize data receiving and transmitting through the antenna.
Optionally, a communication line connected to the intelligent ammeter and the photovoltaic inverter is connected to the first port through a combiner.
Optionally, the current mapping terminal communicates with the intelligent terminal of the station area through an isolating switch based on an HPLC method.
The invention also provides a low-voltage distributed photovoltaic user inverter information mapping system, which comprises: the current mapping terminal, intelligent ammeter, photovoltaic inverter, protection breaker, inverter remote terminal, photovoltaic recloser breaker, disconnector according to any of the above terminals, wherein,
the electric energy output end of the photovoltaic inverter, the protection breaker, the photovoltaic automatic reclosing breaker, the intelligent electric energy meter and the isolating switch are sequentially connected in series;
the photovoltaic automatic reclosing circuit breaker is connected to a second port of the current mapping terminal;
the intelligent ammeter and the photovoltaic inverter are in communication connection with a first port of the current mapping terminal;
the inverter remote terminals are respectively connected to a third port of the current mapping terminal and a background master station of the distributed photovoltaic power station in a communication manner;
the isolating switch is also electrically connected with the power port of the current mapping terminal.
Optionally, the system further comprises a surge protector, one end of the surge protector is grounded, and the other end of the surge protector is connected to a line between the protection breaker and the photovoltaic automatic reclosing breaker.
The invention also provides a low-voltage distributed photovoltaic user inverter information mapping method which is applied to the current mapping terminal as any one of the above, and the method comprises the following steps:
receiving a voltage signal and a current signal on a line between the photovoltaic inverter and the protection circuit breaker by using the first port, and/or acquiring electric quantity metering data of the distributed photovoltaic power station from the intelligent electric energy meter;
transmitting the voltage signal, the current signal and the electric quantity metering data or transmitting the voltage signal and the current signal to a platform area intelligent terminal;
receiving a first control instruction returned by the intelligent terminal of the platform area, and sending the first control instruction to the automatic reclosing circuit breaker through a second port when the first control instruction is a closing/opening instruction; when the first control instruction is an adjustment instruction, the first control instruction is sent to a photovoltaic inverter;
and when a second control instruction sent by the inverter remote terminal through the third port is received, the second control instruction is transmitted to the photovoltaic inverter through the first port.
Optionally, sending the voltage signal, the current signal and the electric quantity metering data, or sending the voltage signal and the current signal to a platform area intelligent terminal includes:
and transmitting the voltage signal, the current signal and the electric quantity metering data or transmitting the voltage signal and the current signal to a station intelligent terminal based on an HPLC communication module or a remote communication module.
Optionally, the method further comprises:
when the number of the photovoltaic inverters directly connected with the current mapping terminal is greater than or equal to two, a simulation test instruction is sent to an inverter remote terminal according to a preset period, so that the inverter remote terminal generates a first test instruction aiming at the current photovoltaic inverter and a second test instruction aiming at other photovoltaic inverters, and the first test instruction and the second test instruction are control instructions with opposite equivalence;
receiving a first test instruction aiming at the current photovoltaic inverter and a second test instruction aiming at other photovoltaic inverters sent by an inverter remote terminal and executing the first test instruction;
respectively acquiring voltage/current first sampling signals of the current photovoltaic inverter, and judging whether the voltage/current first sampling signals are matched with a first test instruction or not; if so, judging that the transparent transmission for the current photovoltaic inverter is effective; if the current photovoltaic inverter is not matched with the current photovoltaic inverter, judging that the transmission of the current photovoltaic inverter fails;
respectively acquiring voltage/current second sampling signals of other photovoltaic inverters, and judging whether the voltage/current second sampling signals are matched with a second test instruction or not; if so, judging that the transparent transmission for other photovoltaic inverters is effective; and if the two types of the photovoltaic inverters are not matched, judging that the transmission of the other photovoltaic inverters fails.
Optionally, the method further comprises:
when the number of the photovoltaic inverters directly connected with the current mapping terminal is one, sending a simulation test instruction to an inverter remote terminal according to a preset period, so that the inverter remote terminal generates a third test instruction for the current photovoltaic inverter and sends the third test instruction to the corresponding photovoltaic inverter, wherein the simulation test instruction comprises a time stamp, and the time corresponding to the time stamp is a time with a set duration after the current time;
the simulation test instruction is sent to the intelligent terminal of the platform area, so that the intelligent terminal of the platform area forwards the simulation test instruction to other mapping terminals, the other mapping terminals generate a corresponding fourth test instruction according to the simulation test instruction and return a fourth voltage/current sampling signal corresponding to the fourth test instruction to the intelligent terminal of the platform area, and the third test instruction is opposite to the fourth test instruction in value;
acquiring a third sampling signal corresponding to a third test instruction voltage/current, and acquiring a fourth sampling signal of the voltage/current from the intelligent terminal of the platform area;
judging whether the voltage/current fourth sampling signal is opposite to the voltage/current third sampling signal in value or not, if so, judging that the transparent transmission of the current photovoltaic inverter and the photovoltaic inverter connected corresponding to other mapping terminals is effective; if not, the transparent transmission failure of the current photovoltaic inverter and the photovoltaic inverter connected corresponding to other mapping terminals is judged.
Optionally, the other mapping terminals and the current mapping terminal are accessed to the same point of connection.
Compared with the prior art, the invention has the following advantages:
the invention realizes direct data collection and coordination management of all devices in the grid-connected point and communication with uplink equipment or a master station by being arranged at the distributed photovoltaic grid-connected point or the title demarcation point, simplifies the internal equipment constitution of the distributed photovoltaic grid-connected point, shortens the links of data collection and receiving and transmitting, and improves timeliness.
In addition, the invention can enhance the coordination capability among the devices, improve the monitoring level of the grid connection point, improve the self-regulation capability of the power grid and ensure the stable operation of the power grid.
Drawings
Fig. 1 is a schematic structural diagram of a low-voltage distributed photovoltaic user inverter information mapping terminal according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a low-voltage distributed photovoltaic user inverter information mapping system according to an embodiment of the present invention;
fig. 3 is a schematic flow chart of a low-voltage distributed photovoltaic user inverter information mapping method according to an embodiment of the present invention;
fig. 4 is a flow chart of another method for mapping information of a low-voltage distributed photovoltaic user inverter according to an embodiment of the present invention;
fig. 5 is a schematic diagram of internal connection in another method for mapping information of a low-voltage distributed photovoltaic user inverter according to an embodiment of the present invention;
fig. 6 is a schematic diagram of grid connection in another method for mapping information of a low-voltage distributed photovoltaic user inverter according to an embodiment of the present invention.
Detailed Description
The following describes in detail the examples of the present invention, which are implemented on the premise of the technical solution of the present invention, and detailed embodiments and specific operation procedures are given, but the scope of protection of the present invention is not limited to the following examples.
Example 1
Fig. 1 is a schematic structural diagram of a low-voltage distributed photovoltaic user inverter information mapping terminal according to an embodiment of the present invention, as shown in fig. 1, the current mapping terminal 10 includes: a communication port 101, a voltage sampling port 103, a current sampling port 105, a power port 107, and an antenna 109, wherein,
a first port 101A in the communication port 101 is respectively in communication connection with the intelligent ammeter 20 and the data output port of the photovoltaic inverter 30, and a second port 101B in the communication port 101 is in communication connection with the photovoltaic automatic reclosing circuit breaker 60;
the third port of the current mapping terminal is in communication connection with the inverter remote terminal 50, and the inverter remote terminal 50 is in communication connection with a background master station of the distributed photovoltaic power station;
the voltage sampling port 103 of the current mapping terminal receives a voltage signal on a line between the photovoltaic inverter 30 and the protection circuit breaker 40;
the current sampling port 105 of the current mapping terminal receives the current signal on the line between the photovoltaic inverter 30 and the protection circuit breaker 40;
the power port 107 is connected to the isolating switch 70 between the distributed photovoltaic power station and the power grid to draw power from the isolating switch 70;
the antenna 109 is used for sending information collected by the mapping terminal to a remote center, receiving control instructions from the intelligent terminal of the area, and realizing data receiving and transmitting by using 4G, 5G and other communication networks through the antenna 109. The communication protocol of the Q/GDW10376.3-2019 electricity consumption information acquisition system is met in part 3: the technical requirement of the remote communication module interface of the acquisition terminal supports communication with a background server through a remote communication module (such as 4G).
When data collection is performed, the current mapping terminal 10 can read data from the intelligent ammeter 20 through a 485-1 communication line, wherein the read data comprise, but are not limited to, data of the working state of the intelligent ammeter 20, the internet power of the distributed photovoltaic power station, the power absorbed from a power grid and the like. The current mapping terminal 10 can read data such as output voltage, output current, output electric quantity and working state of the photovoltaic inverter 30 from the photovoltaic inverter 30 through a 485-2 communication line. In practical applications, a combiner may be used to combine the 485-1 communication line and the 485-2 communication line into one path to be sent to the first port 101A of the current mapping terminal 10.
The current mapping terminal 10 can read the state data of the photovoltaic automatic reclosing circuit breaker 60 from the photovoltaic automatic reclosing circuit breaker 60 through a 485-3 communication line, and the photovoltaic automatic reclosing circuit breaker 60 can also receive a first control instruction from the current mapping terminal 10 through the 485-3 communication line, and perform switching-on or switching-off operation according to the first control instruction.
The current mapping terminal 10 can send an inverter second control instruction to the inverter remote terminal 50 through a 485-4 communication line, and the inverter remote terminal 50 can transmit the second control instruction to the photovoltaic inverter 30 through the 485-4 communication line and the current mapping terminal 10 and the 485-2 communication line so as to control parameters such as output voltage, output current, output duration and the like of the photovoltaic inverter 30.
The voltage sampling port 103 of the current mapping terminal 10 receives the voltage signal on the line between the photovoltaic inverter 30 and the protection circuit breaker 40; the current sampling port 105 of the current mapping terminal 10 receives the current signal on the line between the photovoltaic inverter 30 and the protection circuit breaker 40; the current mapping terminal 10 can compare whether the line voltage signal and the line current signal are consistent with the voltage signal and the line current signal acquired from the photovoltaic inverter 30, and if so, the working state of the photovoltaic inverter 30 is normal; the online electric quantity on the intelligent electric energy meter 20 can be compared, whether the online electric quantity is consistent with the electric quantity output by the photovoltaic inverter 30 or not, if the online electric quantity is inconsistent with the electric quantity output by the photovoltaic inverter 30, the fault of one of the intelligent electric energy meter 20 and the photovoltaic inverter 30 is indicated, and if the working state of the photovoltaic inverter 30 is determined to be normal, the fault of the intelligent electric energy meter 20 can be determined.
To maintain operation of the current mapping terminal 10, the power port 107 of the current mapping terminal 10 is connected to the disconnector 70 on the line between the distributed photovoltaic power plant and the grid to draw power from the disconnector 70.
In another implementation of the embodiment of the present invention, the current mapping terminal 10 may also use a physical line from itself to the isolation switch 70 to the intelligent terminal of the station to implement communication based on HPLC (high-speed carrier communication of the voltage power line). The HPLC communication module used by the current mapping terminal 10 meets the requirements of the technical specification of high-speed carrier communication interconnection and intercommunication of Q/GDW 11612-2018 voltage power lines, meets the technical requirements of the technical application manual V2.7 of HPLC, and supports communication with a concentrator through the HPLC module.
Example 2
Based on the embodiment 1 of the invention, the embodiment 2 of the invention provides a low-voltage distributed photovoltaic user inverter information mapping system.
Fig. 2 is a schematic structural diagram of a low-voltage distributed photovoltaic user inverter information mapping system according to an embodiment of the present invention, where, as shown in fig. 2, the system includes: the present mapping terminal 10, intelligent ammeter 20, photovoltaic inverter 30, protection circuit breaker 40, inverter remote terminal 50, photovoltaic recloser circuit breaker 60, disconnector 70 as described in example 1, wherein,
the electric energy output end of 220V alternating current of the photovoltaic inverter 30, the protection circuit breaker 40, the photovoltaic automatic reclosing circuit breaker 60, the intelligent electric energy meter 20 and the isolating switch 70 are sequentially connected in series;
the signal output end of the photovoltaic automatic reclosing breaker 60 is connected to the second port 101B of the current mapping terminal 10; the photovoltaic automatic reclosing circuit breaker 60 has a voltage protection function, when the power grid side is powered off, the circuit breaker is automatically opened, when the power grid side is powered on, the circuit breaker is automatically closed, and meanwhile, the circuit breaker also has an RS485 communication function, and can be remotely controlled to be closed and opened. The RS485 communication line of the circuit breaker can be connected to the RS485 interface of the current mapping terminal 10 when wired in the field.
The intelligent ammeter 20 and the photovoltaic inverter 30 are communicatively connected to the first port 101A of the current mapping terminal 10;
the inverter remote terminal 50 is communicatively connected to the third port of the current mapping terminal 10 and to a background master station of the distributed photovoltaic power plant, respectively, wherein the background master station refers to an internal control center of the distributed photovoltaic power plant, e.g. the photovoltaic power plant 1 has one internal control center 1, the photovoltaic power plant 2 also has one internal control center 2, and the photovoltaic power plant 3 also has one internal control center 3. Each internal control center is mutually independent, and each internal control center can only control the corresponding photovoltaic power station.
The input of the isolating switch 70 is electrically connected with the output of the intelligent ammeter 20, the output of the isolating switch 70 is incorporated into the power grid, and the power output of the isolating switch 70 is also electrically connected with the power port 107 of the current mapping terminal 10. The isolating switch realizes the isolating function, and when the terminal equipment shown in the embodiment of the invention is maintained, the isolating switch can be disconnected, so that the metering box is separated from the main power grid, and the construction safety is ensured.
As shown in fig. 2, the device is installed on a distributed photovoltaic grid-connected point or a title demarcation point, and can realize the functions of complete collection of status information of the title demarcation point and the grid-connected point, power quality monitoring and control, power generation load distribution and adjustment, photovoltaic grid-connected anomaly monitoring, anti-islanding monitoring, HPLC and 4G dual-uplink remote communication channels and the like.
Furthermore, the terminal shown in the embodiment 2 of the invention can be used as a photovoltaic grid-connected metering box,
in practical application, the protection circuit breaker 40 also has an isolating function, and can be manually disconnected during field maintenance, so that the circuit between the metering box and the photovoltaic is ensured to be disconnected.
In the existing photovoltaic field, the inverter is usually provided with an inverter remote terminal, and the inverter is mainly used for connecting a background master station of the photovoltaic inverter. The photovoltaic inverter usually has only 1 path of RS485, so three functions are needed to be realized on the premise of 1 path of 485:
function 1: the current mapping terminal 10 directly reads the data of the photovoltaic inverter 30, and the intelligent terminal of the transformer area can directly control the remote terminal 50 of the inverter, so that the remote terminal 50 of the inverter can transmit the control instruction of the intelligent terminal of the transformer area to the photovoltaic inverter 30 through 485-4 and current mapping terminals 10 and 485-2 lines;
function 2: the internal control center of the photovoltaic power plant controls the operation of the photovoltaic inverter 30 through the inverter remote terminal 50.
Function 3: the current mapping terminal 10 may send data directly reading the photovoltaic inverter 30 to the internal control center of the photovoltaic power plant via the inverter remote terminal 50.
The direct control and measurement of the photovoltaic inverter 30 is achieved without affecting the data reading and control by the internal control center of the photovoltaic power plant.
In addition, the current mapping terminal 10 can realize the collection and equipment control of the state data of the intelligent ammeter 20, the photovoltaic inverter 30, the protection breaker 40, the inverter remote terminal 50 and the photovoltaic automatic reclosing breaker 60, and the functions are more diversified.
In another embodiment of the present invention, the system further comprises a surge protector 80, wherein one end of the surge protector 80 is grounded, and the other end is connected to a line between the protection circuit breaker 40 and the photovoltaic automatic reclosing circuit breaker 60 for lightning surge protection.
Finally, the embodiment of the invention can adopt a brand new hardware topological structure design, has an HPLC dual-mode communication function, can be interconnected and communicated with equipment such as a concentrator, a district intelligent terminal and the like, is convenient for realizing district edge calculation, can be directly communicated with a main station, and improves the communication efficiency and response speed of the photovoltaic matched equipment.
In practical application, the system shown in the embodiment 2 of the invention can be sealed in an IP 66-level box body to form a grid-connected point metering box.
Example 3
Based on the embodiment 1 of the invention, the embodiment 3 of the invention also provides a low-voltage distributed photovoltaic user inverter information mapping method.
Fig. 3 is a flow chart of a low-voltage distributed photovoltaic user inverter information mapping method according to an embodiment of the present invention, as shown in fig. 3, the method is applied to the current mapping terminal 10 according to embodiment 1, and the method includes:
s301: receiving voltage signals and current signals on the line between the photovoltaic inverter 30 and the protection circuit breaker 40 and/or acquiring electric quantity metering data of the distributed photovoltaic power station from the intelligent ammeter 20 by using the first port 101A;
s302: transmitting the voltage signal, the current signal and the electric quantity metering data or transmitting the voltage signal and the current signal to a platform area intelligent terminal;
s303: receiving a first control instruction returned by the intelligent terminal of the platform area, and when the first control instruction is a closing/opening instruction, sending the first control instruction to the automatic reclosing circuit breaker through a second port 101B; when the first control command is an adjustment command, sending the first control command to the photovoltaic inverter 30;
s304: upon receiving a second control command sent from the inverter remote terminal 50 through the third port, the second control command is transmitted through the first port 101A to the photovoltaic inverter 30.
In another implementation manner of the embodiment of the present invention, the current mapping terminal 10 may further transmit the voltage signal, the current signal and the electric quantity measurement data to the intelligent terminal of the station based on the HPLC communication module or the remote communication module.
Example 4
Based on embodiment 3 of the present invention, embodiment 4 of the present invention provides another low-voltage distributed photovoltaic user inverter information mapping method.
Fig. 4 is a flow chart of another method for mapping information of a low-voltage distributed photovoltaic user inverter according to an embodiment of the present invention, as shown in fig. 4, where the method specifically includes:
s401: when the number of photovoltaic inverters directly connected to the current mapping terminal 10 is equal to or greater than two. Fig. 5 is a schematic diagram of internal connection in another low-voltage distributed photovoltaic consumer inverter information mapping method according to an embodiment of the present invention, where, as shown in fig. 5, the current photovoltaic inverter 501 is connected to the current mapping terminal 10, and other photovoltaic inverters 502 are connected to the current mapping terminal 10. The intelligent terminal of the transformer area transmits an analog test instruction to the remote terminal 50 of the inverter according to a preset period. The intelligent terminal in the platform region controls the photovoltaic power stations which are mutually different from each other, the photovoltaic power stations are respectively combined into the power grid from different positions, the photovoltaic power stations can be in countercurrent prevention and unidirectional network access, and can also be in bidirectional network access, and the embodiment of the invention does not limit the grid connection mode of the photovoltaic power stations.
After the inverter remote terminal 50 receives the simulated test instructions, it generates a first test instruction to power up 10kW for the current photovoltaic inverter and a second test instruction to power down 10kW for the other photovoltaic inverters 502. In practical application, when the current photovoltaic inverter 501 is connected in parallel with the other photovoltaic inverters 502, the first test instruction may also be power down by 10kW, and correspondingly, the second test instruction may be power up by 10kW; similarly, in the parallel case, the first test instruction and the second test instruction may also be commands to regulate the current. When the current photovoltaic inverter 501 is connected in series with the other photovoltaic inverter 502, the first test instruction and the second test instruction may be voltage regulation instructions, and it is understood that one is a turn-up and one is a turn-down, but the two regulation values are equal.
In practical applications, the preset period may be 1 hour, 1 day, 3 days, etc.
S402: the current photovoltaic inverter 501 and the other photovoltaic inverters 502 respectively receive and execute the first test instruction and the second test instruction sent by the inverter remote terminal 50.
S403: the current mapping terminal 10 measures a first voltage/current sampling signal of the current photovoltaic inverter 501 through the voltage sampling port 103 and the current sampling port 105, and judges whether the first voltage/current sampling signal is matched with a first test instruction; if the first test instruction is matched, the current photovoltaic inverter 501 is correctly executed, and transparent transmission of the current photovoltaic inverter 501 is judged to be effective; if not, it is determined that the transmission to the current photovoltaic inverter 501 fails. The precondition for the current determination of the transparent failure of the current photovoltaic inverter 501 is that the voltage and current parameters of the current photovoltaic inverter 501 output through the 485-2 line are consistent with the first voltage/current sampling signal measured by the current mapping terminal 10.
S405: similarly, voltage/current second sampling signals of other photovoltaic inverters 502 can be obtained respectively, and whether the voltage/current second sampling signals are matched with the second test instruction or not can be judged; if so, judging that the transparent transmission for other photovoltaic inverters 502 is effective; if the two types of photovoltaic inverters 502 do not match, the transparent transmission failure for the other photovoltaic inverters is determined.
In the embodiment of the present invention, the working process of other photovoltaic inverters 502 is the same as step S404, and the embodiment of the present invention is not described herein again.
By applying the embodiment of the invention, the working state test of the inverter remote terminal 50 can be performed under the condition that the voltage, current and power parameters of the grid-connected point are not influenced.
Fig. 6 is a schematic diagram of grid connection in another low-voltage distributed photovoltaic user inverter information mapping method according to an embodiment of the present invention, as shown in fig. 6, and in another specific implementation manner of the embodiment of the present invention, the method further includes:
when the number of photovoltaic inverters directly connected to the current mapping terminal 10 is one, a simulation test instruction is sent to the inverter remote terminal 50 according to the current time t corresponding to the preset period. The current time corresponding to the next period is t+T, wherein T is a preset period.
The inverter remote terminal 50 then generates a third test order for the current photovoltaic inverter 501 to power up by 10kW at time t+t1 and sends the third test order to the corresponding photovoltaic inverter. t1 is the set duration.
The current mapping terminal 10 sends the simulated test instruction to the intelligent terminal of the area, and the intelligent terminal of the area forwards the simulated test instruction to other mapping terminals 602. It is emphasized that the other mapping terminals 602, as well as the current mapping terminal 10, respectively belong to different photovoltaic power stations, independent of each other, each having only one mapping terminal.
The other mapping terminals 602 generate a fourth test instruction with the power reduced by 10kW according to the simulation test instruction and return a fourth voltage/current sampling signal corresponding to the fourth test instruction to the intelligent terminal of the platform area, wherein the third test instruction is opposite to the fourth test instruction in value; as shown in fig. 6, other mapping terminals 602 are connected to the same grid connection point 604 as the current mapping terminal 10.
Other mapping terminals acquire corresponding measurement data by using the principle shown in the embodiment 1, form a fourth voltage/current sampling signal and send the fourth voltage/current sampling signal to the intelligent terminal of the platform area. The bay intelligent terminal forwards the voltage/current fourth sampled signal to the current mapping terminal 10.
Then, the current mapping terminal 10 acquires a third sampling signal corresponding to a third test instruction voltage/current, and acquires a fourth sampling signal of the voltage/current from the intelligent terminal of the area; judging whether the voltage/current fourth sampling signal is opposite to the voltage/current third sampling signal in value, if so, judging that the transparent transmission of the current photovoltaic inverter 501 and the photovoltaic inverter connected corresponding to other mapping terminals is effective; if not, it is determined that the transmission to the current photovoltaic inverter 501 and the photovoltaic inverter connected to the other mapping terminal fails.
Of course, the other mapping terminals 602 need to determine that the voltage/current fourth sampling signal has been properly executed by the corresponding photovoltaic inverter before sending the voltage/current fourth sampling signal to the bay intelligent terminals.
By applying the embodiment of the invention, when the number of the photovoltaic inverters directly connected with the current mapping terminal 10 is one, whether the transparent transmission of the inverter remote terminal is effective or not can be judged.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention.
Claims (10)
1. The utility model provides a low pressure distributing type photovoltaic user inverter information survey and drawing terminal which characterized in that, current survey and drawing terminal includes: a communication port, a voltage sampling port, a current sampling port, a power port and an antenna, wherein,
the first port of the communication port is respectively in communication connection with the intelligent electric energy meter and the data output port of the photovoltaic inverter, and the second port of the communication port is in communication connection with the photovoltaic automatic reclosing circuit breaker;
the third port of the current mapping terminal is in communication connection with the remote terminal of the inverter, and the remote terminal of the inverter is in communication connection with the background master station of the distributed photovoltaic power station;
a voltage sampling port of the current mapping terminal receives a voltage signal on a line between a photovoltaic inverter and a protection circuit breaker;
a current sampling port of the current mapping terminal receives a current signal on a line between the photovoltaic inverter and the protection circuit breaker;
the power port is connected to an isolating switch between the distributed photovoltaic power station and the power grid to take electricity from the isolating switch and realize data receiving and transmitting through the antenna.
2. The low voltage distributed photovoltaic consumer inverter information mapping terminal of claim 1, wherein the communication line connected to the intelligent ammeter and the photovoltaic inverter is connected to the first port through a combiner.
3. The low voltage distributed photovoltaic consumer inverter information mapping terminal of claim 1, wherein the current mapping terminal communicates with the zone intelligent terminal through a disconnecting switch based on an HPLC method.
4. A low voltage distributed photovoltaic consumer inverter information mapping system, the system comprising: the current mapping terminal, intelligent ammeter, photovoltaic inverter, protection circuit breaker, inverter remote terminal, photovoltaic recloser circuit breaker, disconnector according to any of claims 1-3, wherein,
the electric energy output end of the photovoltaic inverter, the protection breaker, the photovoltaic automatic reclosing breaker, the intelligent electric energy meter and the isolating switch are sequentially connected in series;
the photovoltaic automatic reclosing circuit breaker is connected to a second port of the current mapping terminal;
the intelligent ammeter and the photovoltaic inverter are in communication connection with a first port of the current mapping terminal;
the inverter remote terminals are respectively connected to a third port of the current mapping terminal and a background master station of the distributed photovoltaic power station in a communication manner;
the isolating switch is also electrically connected with the power port of the current mapping terminal.
5. The system of claim 4, further comprising a surge protector having one end connected to ground and the other end connected to a line between the protection circuit breaker and the photovoltaic recloser circuit breaker.
6. A low voltage distributed photovoltaic consumer inverter information mapping method applied to the current mapping terminal of any one of claims 1-3, the method comprising:
receiving a voltage signal and a current signal on a line between the photovoltaic inverter and the protection circuit breaker by using the first port, and/or acquiring electric quantity metering data of the distributed photovoltaic power station from the intelligent electric energy meter;
transmitting the voltage signal, the current signal and the electric quantity metering data or transmitting the voltage signal and the current signal to a platform area intelligent terminal;
receiving a first control instruction returned by the intelligent terminal of the platform area, and sending the first control instruction to the automatic reclosing circuit breaker through a second port when the first control instruction is a closing/opening instruction; when the first control instruction is an adjustment instruction, the first control instruction is sent to a photovoltaic inverter;
and when a second control instruction sent by the inverter remote terminal through the third port is received, the second control instruction is transmitted to the photovoltaic inverter through the first port.
7. The method of claim 6, wherein sending the voltage signal, the current signal, and the power metering data, or sending the voltage signal and the current signal to a station intelligent terminal comprises:
and transmitting the voltage signal, the current signal and the electric quantity metering data or transmitting the voltage signal and the current signal to a station intelligent terminal based on an HPLC communication module or a remote communication module.
8. The method of claim 6, further comprising:
when the number of the photovoltaic inverters directly connected with the current mapping terminal is greater than or equal to two, a simulation test instruction is sent to an inverter remote terminal according to a preset period, so that the inverter remote terminal generates a first test instruction aiming at the current photovoltaic inverter and a second test instruction aiming at other photovoltaic inverters, and the first test instruction and the second test instruction are control instructions with opposite equivalence;
receiving a first test instruction aiming at the current photovoltaic inverter and a second test instruction aiming at other photovoltaic inverters sent by an inverter remote terminal and executing the first test instruction;
respectively acquiring voltage/current first sampling signals of the current photovoltaic inverter, and judging whether the voltage/current first sampling signals are matched with a first test instruction or not; if so, judging that the transparent transmission for the current photovoltaic inverter is effective; if the current photovoltaic inverter is not matched with the current photovoltaic inverter, judging that the transmission of the current photovoltaic inverter fails;
respectively acquiring voltage/current second sampling signals of other photovoltaic inverters, and judging whether the voltage/current second sampling signals are matched with a second test instruction or not; if so, judging that the transparent transmission for other photovoltaic inverters is effective; and if the two types of the photovoltaic inverters are not matched, judging that the transmission of the other photovoltaic inverters fails.
9. The method of claim 6, further comprising:
when the number of the photovoltaic inverters directly connected with the current mapping terminal is one, sending a simulation test instruction to an inverter remote terminal according to a preset period, so that the inverter remote terminal generates a third test instruction for the current photovoltaic inverter and sends the third test instruction to the corresponding photovoltaic inverter, wherein the simulation test instruction comprises a time stamp, and the time corresponding to the time stamp is a time with a set duration after the current time;
the simulation test instruction is sent to the intelligent terminal of the platform area, so that the intelligent terminal of the platform area forwards the simulation test instruction to other mapping terminals, the other mapping terminals generate a corresponding fourth test instruction according to the simulation test instruction and return a fourth voltage/current sampling signal corresponding to the fourth test instruction to the intelligent terminal of the platform area, and the third test instruction is opposite to the fourth test instruction in value;
acquiring a third sampling signal corresponding to a third test instruction voltage/current, and acquiring a fourth sampling signal of the voltage/current from the intelligent terminal of the platform area;
judging whether the voltage/current fourth sampling signal is opposite to the voltage/current third sampling signal in value or not, if so, judging that the transparent transmission of the current photovoltaic inverter and the photovoltaic inverter connected corresponding to other mapping terminals is effective; if not, the transparent transmission failure of the current photovoltaic inverter and the photovoltaic inverter connected corresponding to other mapping terminals is judged.
10. The method of claim 9, wherein the other mapping terminals are connected to the same point of presence as the current mapping terminal.
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