CN117040116B - Communication method and monitoring system between collector and micro inverter - Google Patents
Communication method and monitoring system between collector and micro inverter Download PDFInfo
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- CN117040116B CN117040116B CN202310957338.5A CN202310957338A CN117040116B CN 117040116 B CN117040116 B CN 117040116B CN 202310957338 A CN202310957338 A CN 202310957338A CN 117040116 B CN117040116 B CN 117040116B
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- electric quantity
- inverter
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- 238000004891 communication Methods 0.000 title claims abstract description 41
- 238000000034 method Methods 0.000 title claims abstract description 28
- 238000012544 monitoring process Methods 0.000 title claims abstract description 9
- 230000015654 memory Effects 0.000 claims description 8
- 230000003247 decreasing effect Effects 0.000 claims description 4
- 238000001514 detection method Methods 0.000 claims description 4
- 230000005611 electricity Effects 0.000 claims 2
- 230000006855 networking Effects 0.000 abstract description 14
- 230000008569 process Effects 0.000 abstract description 4
- 230000004044 response Effects 0.000 description 5
- 230000005540 biological transmission Effects 0.000 description 3
- 238000010248 power generation Methods 0.000 description 2
- 238000001228 spectrum Methods 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 208000030251 communication disease Diseases 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 description 1
- 239000000284 extract Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B15/00—Suppression or limitation of noise or interference
- H04B15/02—Reducing interference from electric apparatus by means located at or near the interfering apparatus
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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
-
- 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
-
- 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
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
Abstract
The invention provides a communication method and a monitoring system between a collector and a micro inverter, wherein the communication method comprises the following steps: transmitting identification code lists of a plurality of micro-inverters to be monitored to a collector; when the collector needs to collect electric quantity, selecting a micro inverter in the identification code list, loading the identification code of the micro inverter into an electric quantity request instruction, and sending the electric quantity request instruction to all the micro inverters; after the micro inverter receives the electric quantity request instruction, judging whether the identification code in the electric quantity request instruction is the same as the identification code of the micro inverter, and if so, sending the electric quantity data of the micro inverter to the collector. The invention can save networking and networking processes under the condition of removing the LFC filter, and ensure that the data communication between the collector and the micro inverter is normal.
Description
Technical Field
The invention relates to the technical field of photovoltaic micro-inverters, in particular to a communication method and a monitoring system between a collector and a micro-inverter.
Background
The existing micro inverter monitoring system can have the problem of communication interference. Because the communication protocol is not specific and can not be used for designating one inverter for data transmission, the communication between the collector and the designated inverter needs to be completed under the closed condition, and the condition that other inverters transmit power generation data to the collector equipment to cause data disorder is prevented.
To circumvent this problem, it is often the case that an LFC filter is provided. The specific cases are as follows: the collector sends networking search request frames to all inverters under the same filter, after the inverters receive the networking search response frames, the collector actively sends networking allocation request frames, the inverters receive allocation instructions, the numbers allocated by the collector are reserved, and allocation responses are given. And then entering a data acquisition mode, and in a data acquisition state, only identifying an acquisition data instruction and a network disconnection instruction by the micro inverter. When receiving a data acquisition instruction, the micro inverter in the system can sequentially reply power generation data to the collector according to the serial number of the previous networking; if a network-disconnection instruction is received, the serial number in the micro inverter is set to 0, and the status flag bit starts from network connection searching. This way of setting the LFC filter places higher demands on the hardware equipment and is costly.
Therefore, how to optimize the communication between the collector and the designated inverter is a focus of attention of those skilled in the art.
Disclosure of Invention
The invention aims to provide a communication method and a monitoring system between a collector and a micro inverter, which can save networking and networking processes under the condition of removing an LFC filter and ensure that the data communication between the collector and the micro inverter is normal.
In order to achieve the above object, the present invention provides a communication method between a collector and a micro inverter, including: transmitting identification code lists of a plurality of micro-inverters to be monitored to a collector;
When the collector needs to collect electric quantity, selecting a micro inverter in the identification code list, loading the identification code of the micro inverter into an electric quantity request instruction, and sending the electric quantity request instruction to all the micro inverters;
After the micro inverter receives the electric quantity request instruction, judging whether the identification code in the electric quantity request instruction is the same as the identification code of the micro inverter, and if so, sending the electric quantity data of the micro inverter to the collector.
In an alternative solution, the collector and the micro inverter perform data transmission through a power line, and before the collector sends the electric quantity request instruction, the method further includes:
and the collector detects the carrier wave and judges whether the carrier wave exists on the power line, if not, the collector sends the electric quantity request instruction to the power line.
In an alternative, the method for detecting the carrier includes: the collector checks whether a carrier mark of a PLC communication module of the collector is set or not, if the carrier mark is set, the same-frequency communication carrier exists on the power line, an electric quantity request instruction is not sent at the moment, and after the carrier mark is cleared, the collector sends the electric quantity request instruction to the power line.
In an alternative solution, the sending the identification code list of the plurality of micro-inverters to be monitored to the collector includes: and installing an application program in the communication device by a user, adding the identification code of the micro-inverter into the application program, and sending the identification code list to the collector through the application program.
In an alternative, the collector stores the list of identification codes in a non-volatile memory.
In an alternative scheme, after the collector is powered on each time or receives an instruction for changing the identification code list of the micro inverter, a new identification code list is read from the nonvolatile memory, and the identification code list is copied into the random access memory.
In an alternative scheme, when the number of the micro-inverters to be acquired changes, the micro-inverters are increased or decreased through the application degree so as to update the identification code list.
In an alternative scheme, when the collector needs to collect electric quantity, the identification code of the first micro inverter in the identification code list is loaded into the electric quantity request instruction;
And after the collector receives the electric quantity data of the micro inverter, the collector loads the next identification code into the electric quantity request instruction according to the identification code list sequence until the complete identification code list is circulated.
The invention also provides a monitoring system which comprises a collector and a plurality of micro-inverters, wherein the micro-inverters are connected with the collector through power lines, and the collector is communicated with the micro-inverters based on the method.
The invention has the beneficial effects that:
According to the invention, under the condition of removing the LFC filter, the networking and networking process is omitted, the normal data communication between the collector and the micro-inverters is ensured, even if one or two micro-inverters are in poor communication, the data can be collected through multiple requests, and the time consumption is short. In the networking mode, if one or two communication devices cannot communicate, all the micro-inverters are required to reply the electric quantity data when requesting again, and the time is too long. The frequency of the data transmitted by the collector to the server is guaranteed.
Drawings
The foregoing and other objects, features and advantages of the invention will be apparent from the following more particular descriptions of exemplary embodiments of the invention as illustrated in the accompanying drawings wherein like reference numbers generally represent like parts throughout the exemplary embodiments of the invention.
Fig. 1 is a flowchart of a communication method between a collector and a micro-inverter according to an embodiment of the invention.
Detailed Description
The invention is described in further detail below with reference to the drawings and the specific examples. The advantages and features of the present invention will become more apparent from the following description and drawings, however, it should be understood that the inventive concept may be embodied in many different forms and is not limited to the specific embodiments set forth herein. The drawings are in a very simplified form and are to non-precise scale, merely for convenience and clarity in aiding in the description of embodiments of the invention.
It will be understood that when an element or layer is referred to as being "on," "adjacent," "connected to," or "coupled to" another element or layer, it can be directly on, adjacent, connected, or coupled to the other element or layer, or intervening elements or layers may be present. In contrast, when an element is referred to as being "directly on," "directly adjacent to," "directly connected to," or "directly coupled to" another element or layer, there are no intervening elements or layers present. It will be understood that, although the terms first, second, third, etc. may be used herein to describe various elements, components, regions, layers and/or sections, these elements, components, regions, layers and/or sections should not be limited by these terms. These terms are only used to distinguish one element, component, region, layer or section from another element, component, region, layer or section. Thus, a first element, component, region, layer or section discussed below could be termed a second element, component, region, layer or section without departing from the teachings of the present invention.
Spatially relative terms, such as "under," "below," "beneath," "under," "above," "over," and the like, may be used herein for ease of description to describe one element or feature's relationship to another element or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use and operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements or features described as "under" or "beneath" other elements would then be oriented "on" the other elements or features. Thus, the exemplary terms "below" and "under" may include both an upper and a lower orientation. The device may be otherwise oriented (rotated 90 degrees or other orientations) and the spatially relative descriptors used herein interpreted accordingly.
The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. As used herein, the term "and/or" includes any and all combinations of the associated listed items.
Example 1
Referring to fig. 1, the present embodiment provides a communication method between a collector and a micro inverter, including:
transmitting identification code lists of a plurality of micro-inverters to be monitored to a collector;
When the collector needs to collect electric quantity, selecting a micro inverter in the identification code list, loading the identification code of the micro inverter into an electric quantity request instruction, and sending the electric quantity request instruction to all the micro inverters;
After the micro inverter receives the electric quantity request instruction, judging whether the identification code in the electric quantity request instruction is the same as the identification code of the micro inverter, and if so, sending the electric quantity data of the micro inverter to the collector.
Specifically, each micro-inverter will have a unique identification code (UID) when shipped from the factory, and when a user takes the micro-inverter, an application program (such as APP software installed in a mobile phone) in a communication device (such as a mobile phone) can be used to add the identification code of the micro-inverter owned by the user to the application program, and the application program sends all UID lists to the collector. When the number of the micro-inverters to be acquired changes, the micro-inverters are increased or decreased through the application degree so as to update the identification code list. After the collector receives the UID list of the micro-inverter, the UID list of the micro-inverter is stored in the nonvolatile memory.
The collector and the micro inverter perform data transmission through a power line, and before the collector sends the electric quantity request instruction, the method further comprises: the collector detects the carrier wave and judges whether the carrier wave exists on the power line, if not, the collector sends the electric quantity request instruction to the power line to prevent other communication on the power grid (power line) from causing the whole communication disorder of the power grid. Specifically, the method for carrier detection includes: before the collector sends an electric quantity request instruction, the MCU module of the collector communicates with the PLC communication module of the collector through the SPI to check whether a carrier wave mark of the PLC communication module is set, if the carrier wave mark is set, the collector can send the electric quantity request instruction to the electric network after the carrier wave mark is cleared, when the PLC communication module receives a spread spectrum signal conforming to the type of the PLC communication module, the carrier wave detection mark position is set, and after the spread spectrum signal disappears for 4-10 ms, the carrier wave detection mark position is cleared).
After the collector is powered on each time or the collector receives an instruction that the micro-inverter UID list is changed (the user increases or decreases the micro-inverter, and sends the increased or decreased micro-inverter UID list to the collector through the APP), the UID list is read from the nonvolatile memory, and the UID list is copied into the random access memory. The random access memory can be added into the program to run, but the power-down data is lost, the nonvolatile memory cannot participate in the program to run, but the power-down data is not lost, so that two memories are adopted.
And according to the requirements, electric quantity collection is carried out once at intervals, so that the time of uploading the data to the server is basically fixed. When the collector considers that the data of the micro-inverter needs to be collected, the UID of the micro-inverter is loaded into the electric quantity request instruction from the UID of the first micro-inverter in the UID list of the micro-inverter, and after the collector loads the electric quantity request instruction data, the electric quantity request instruction is sent to the power grid through the PLC communication module, and all the micro-inverters on the power grid can receive the electric quantity request instruction through the PLC communication module of the micro-inverter. After receiving the electric quantity request command, the micro inverter extracts the UID in the command and compares the UID with the UID of the micro inverter, if the electric quantity request command is the same, the micro inverter loads the electric quantity data of the micro inverter into a response data frame, the response data frame is sent to the power grid through the PLC communication module, and after receiving the response data through the PLC communication module of the micro inverter, the collector continues to request the data of the next UID in the UID list until the whole UID list is circulated, and the completion of one-time electric quantity collection operation is indicated.
According to the embodiment, under the condition that the LFC filter is removed, a networking and networking process is omitted, normal data communication between the collector and the micro-inverters is ensured, even if one or two micro-inverters are bad in communication, the data can be collected through multiple requests, and the time consumption is short. In the networking mode, if one or two communication devices cannot communicate, all the micro-inverters are required to reply the electric quantity data when requesting again, and the time is too long. The frequency of the data transmitted by the collector to the server is guaranteed.
Example 2
The embodiment provides a monitoring system, which comprises a collector and a plurality of micro-inverters, wherein the micro-inverters are connected with the collector through power lines, and the collector is communicated with the micro-inverters based on the method.
The above description is only illustrative of the preferred embodiments of the present invention and is not intended to limit the scope of the present invention, and any alterations and modifications made by those skilled in the art based on the above disclosure shall fall within the scope of the appended claims.
Claims (7)
1. A method of communication between a collector and a micro-inverter, comprising:
transmitting identification code lists of a plurality of micro-inverters to be monitored to a collector;
When the collector needs to collect electric quantity, selecting a micro inverter in the identification code list, loading the identification code of the micro inverter into an electric quantity request instruction, and sending the electric quantity request instruction to all the micro inverters;
After the micro inverter receives the electric quantity request instruction, judging whether the identification code in the electric quantity request instruction is the same as the identification code of the micro inverter, and if so, sending the electric quantity data of the micro inverter to the collector;
The step of sending the identification code list of the plurality of micro-inverters to be monitored to the collector comprises the following steps: a user installs an application program in a communication device, adds the identification code of the micro inverter into the application program, and sends the identification code list to the collector through the application program;
when the number of the micro-inverters to be acquired changes, the micro-inverters are increased or decreased through the application degree so as to update the identification code list.
2. The method of communication between a collector and a microinverter of claim 1, wherein the collector and the microinverter are data transmitted over a power line, the method further comprising, prior to the collector sending the power request command:
and the collector detects the carrier wave and judges whether the carrier wave exists on the power line, if not, the collector sends the electric quantity request instruction to the power line.
3. The method of communication between a collector and a micro-inverter of claim 2, wherein the method of carrier detection comprises:
the collector checks whether a carrier mark of a PLC communication module of the collector is set or not, if the carrier mark is set, the same-frequency communication carrier exists on the power line, an electric quantity request instruction is not sent at the moment, and after the carrier mark is cleared, the collector sends the electric quantity request instruction to the power line.
4. The method of communicating between a collector and a microinverter of claim 1 wherein the collector stores the list of identification codes in a non-volatile memory.
5. The method of claim 4, wherein each time the collector is powered up or after receiving an instruction to change the identification code list of the micro-inverter, the new identification code list is read from the nonvolatile memory, and the identification code list is copied to the random access memory.
6. The method of claim 1, wherein when the collector needs to collect electricity, the identification code of the first micro-inverter in the identification code list is loaded into the electricity request command;
And after the collector receives the electric quantity data of the micro inverter, the collector loads the next identification code into the electric quantity request instruction according to the identification code list sequence until the complete identification code list is circulated.
7. A monitoring system comprising a collector and a plurality of micro-inverters, the micro-inverters and the collector being connected by a power line, the collector being in communication with the micro-inverters based on the method of any one of claims 1-6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310957338.5A CN117040116B (en) | 2023-08-01 | 2023-08-01 | Communication method and monitoring system between collector and micro inverter |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202310957338.5A CN117040116B (en) | 2023-08-01 | 2023-08-01 | Communication method and monitoring system between collector and micro inverter |
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| CN117040116A CN117040116A (en) | 2023-11-10 |
| CN117040116B true CN117040116B (en) | 2024-08-09 |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107404336A (en) * | 2016-09-12 | 2017-11-28 | 四川海博智能科技有限责任公司 | Power line carrier communication method for collision avoidance |
| CN115940804A (en) * | 2022-12-27 | 2023-04-07 | 阳光电源股份有限公司 | Photovoltaic system and communication method |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AU2011203367B2 (en) * | 2007-05-17 | 2013-09-12 | Enphase Energy, Inc. | Distributed inverter and intelligent gateway |
| US9276635B2 (en) * | 2012-06-29 | 2016-03-01 | Sunpower Corporation | Device, system, and method for communicating with a power inverter using power line communications |
| CN206595772U (en) * | 2017-03-31 | 2017-10-27 | 黄山东安新高能源科技有限公司 | A kind of monitoring device for being used to correct Miniature inverter road daily generation data |
| CN113972746B (en) * | 2021-11-22 | 2024-04-30 | 广东电网有限责任公司 | Low-voltage grid-connected distributed photovoltaic observation and control method and device |
| CN114094868A (en) * | 2021-12-16 | 2022-02-25 | 中国华能集团清洁能源技术研究院有限公司 | A photovoltaic inverter composite communication system with PLC and NFC and initialization method |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107404336A (en) * | 2016-09-12 | 2017-11-28 | 四川海博智能科技有限责任公司 | Power line carrier communication method for collision avoidance |
| CN115940804A (en) * | 2022-12-27 | 2023-04-07 | 阳光电源股份有限公司 | Photovoltaic system and communication method |
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