WO2024239453A1 - 一种电力线载波通信方法、装置及光伏系统 - Google Patents

一种电力线载波通信方法、装置及光伏系统 Download PDF

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Publication number
WO2024239453A1
WO2024239453A1 PCT/CN2023/111131 CN2023111131W WO2024239453A1 WO 2024239453 A1 WO2024239453 A1 WO 2024239453A1 CN 2023111131 W CN2023111131 W CN 2023111131W WO 2024239453 A1 WO2024239453 A1 WO 2024239453A1
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Prior art keywords
power line
address
master node
signal strength
target
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PCT/CN2023/111131
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English (en)
French (fr)
Inventor
秦坤
苗晓飞
解家乐
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Sungrow Power Supply Co Ltd
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Sungrow Power Supply Co Ltd
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Priority to EP23938122.1A priority Critical patent/EP4718816A1/en
Publication of WO2024239453A1 publication Critical patent/WO2024239453A1/zh
Anticipated expiration legal-status Critical
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B3/00—Line transmission systems
    • H04B3/54—Systems for transmission via power distribution lines
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B3/00—Line transmission systems
    • H04B3/02—Details
    • H04B3/46—Monitoring; Testing
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L41/00—Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks
    • H04L41/08—Configuration management of networks or network elements
    • H04L41/0803—Configuration setting
    • H04L41/0823—Configuration setting characterised by the purposes of a change of settings, e.g. optimising configuration for enhancing reliability
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L41/00—Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks
    • H04L41/12—Discovery or management of network topologies

Definitions

  • the present application relates to the field of photovoltaic technology, and in particular to a power line carrier communication method, device and photovoltaic system.
  • the inverter serves as the master node of communication
  • the devices under the inverter (such as combiner box, optimizer) serve as slave nodes of communication.
  • the master node and the slave node can exchange data through PLC (Power Line Communication) to collect corresponding data.
  • PLC Power Line Communication
  • the master node often cannot send and receive data according to the actual power line branch between the master node and the slave node, resulting in unreliable data interaction between the master node and the slave node through the PLC.
  • the present application provides a power line carrier communication method, which is applied to a photovoltaic system, wherein the photovoltaic system includes: at least one master node and at least one slave node, and the method includes:
  • the master node sends at least one debug frame to the at least one slave node based on the target power line branch;
  • the master node receives at least one response frame corresponding to each of the at least one debug frame, the response frame corresponding to one of the at least one slave node, and the response frame at least includes an address of the slave node;
  • the master node determines the signal strength corresponding to each of the response frames in at least one response frame corresponding to each of the debug frames;
  • the master node receives the signal strength corresponding to each of the response frames from each of the response frames. Determine the target address that meets the set signal strength condition from the addresses of the slave nodes;
  • the master node establishes a topological relationship between the target power line branch and the target address.
  • the method further includes:
  • the master node exchanges data with the slave node corresponding to the target power line branch based on the topological relationship.
  • the method further includes:
  • the master node sequentially selects one of the multiple power line branches as a target power line branch.
  • the master node determines the signal strength corresponding to each of the response frames in at least one response frame corresponding to each of the debug frames, including:
  • the master node determines the signal strength of a slave node response signal corresponding to each response frame in at least one response frame corresponding to each debug frame.
  • the response frame further includes the signal strength of the master node debugging signal corresponding to the debugging frame.
  • the master node determines the signal strength corresponding to each of the response frames in at least one response frame corresponding to each of the debug frames, including:
  • the master node determines the signal strength of a signal returned from a slave node corresponding to each of the response frames in at least one response frame corresponding to each of the debug frames;
  • the master node obtains the signal strength of the master node debugging signal corresponding to the debugging frame in each of the response frames;
  • the master node determines the signal strength corresponding to the response frame based on the signal strength of the slave node return signal corresponding to the response frame and the signal strength of the master node debugging signal corresponding to the debugging frame in the response frame.
  • the master node determines, based on the signal strength corresponding to each of the response frames, a target address that satisfies the set signal strength condition from the addresses of the slave nodes corresponding to each of the response frames, including:
  • the master node compares the signal strength corresponding to each of the response frames, and determines the target response frame with the strongest signal strength from each of the response frames;
  • the master node determines the address of the slave node in the target response frame as the target address.
  • the master node if there are multiple at least one debugging frame, the master node generates a response frame based on each of the response frames.
  • the corresponding signal strength, determining the target address that meets the set signal strength condition from the address of the slave node corresponding to each of the response frames, includes:
  • the master node determines the response frame corresponding to the address of each slave node from each response frame based on the address of the slave node corresponding to each response frame;
  • the master node determines the signal strength corresponding to the address of each slave node based on the signal strength corresponding to the response frame corresponding to the address of each slave node;
  • the master node compares the signal strength corresponding to the address of each slave node, and determines the target address with the strongest signal strength from the addresses of each slave node.
  • the master node determines the signal strength corresponding to the address of each slave node based on the signal strength corresponding to the response frame corresponding to the address of each slave node, including:
  • the master node determines respectively an average value and/or a variance value of the signal strength corresponding to the response frame corresponding to the address of each slave node, and determines the average value and/or the variance value as the signal strength corresponding to the address of the slave node.
  • the method further includes:
  • the master node determines a target address for each of the target power line branches, it determines that there are duplicate addresses in the target addresses corresponding to each of the target power line branches, and performs deduplication processing on the target addresses corresponding to each of the target power line branches;
  • the master node establishes a topological relationship between the target power line branch and the target address, including:
  • the master node establishes a topological relationship between each of the target power line branches and a target address corresponding to each of the target power line branches after deduplication processing.
  • the method further includes:
  • the master node obtains a communication message
  • the master node sends the communication message to the target power line branch in the topological relationship, so that the slave node corresponding to the target slave node address receives the communication message from the target power line branch, responds to the communication message, and returns the data corresponding to the slave node corresponding to the target slave node address.
  • the method further includes:
  • the master node stores a topological relationship between each of the target power line branches and a target address corresponding to the target power line branch.
  • a power line carrier communication device comprising:
  • a sending module configured to send at least one debugging frame to the at least one slave node based on the target power line branch
  • a receiving module configured to receive at least one response frame corresponding to each of the at least one debugging frame, wherein the response frame corresponds to one of the at least one slave node, and the response frame at least includes an address of the slave node;
  • a first determining module used to determine the signal strength corresponding to each of the at least one response frame corresponding to each of the debugging frames
  • a second determination module is used to determine, based on the signal strength corresponding to each of the response frames, a target address that meets the set signal strength condition from the address of the slave node corresponding to each of the response frames;
  • An establishing module is used to establish a topological relationship between the target power line branch and the target address.
  • a third aspect of the present application provides a photovoltaic system, comprising: at least one master node and at least one slave node, the master node comprising an inverter, and the slave node comprising a combiner box or an optimizer;
  • the inverter is used for:
  • the response frame corresponds to one of the combiner boxes or optimizers corresponding to the inverter, and the response frame at least includes an address of the combiner box or optimizer;
  • the combiner box or the optimizer is used to respond to the debugging frame and return a response to the inverter frame.
  • the present application discloses a power line carrier communication method, device and photovoltaic system.
  • the power line carrier communication method is applied to a photovoltaic system, and the photovoltaic system includes: at least one master node and at least one slave node.
  • the method includes: the master node sends at least one debugging frame to at least one slave node based on the target power line branch; the master node receives at least one response frame corresponding to each debugging frame in at least one debugging frame, the response frame corresponds to one of the at least one slave nodes, and the response frame at least includes the address of the slave node; the master node determines the signal strength corresponding to each response frame in at least one response frame corresponding to each debugging frame; the master node determines the target address that meets the set signal strength condition from the address of the slave node corresponding to each response frame based on the signal strength corresponding to each response frame; the master node establishes a topological relationship between the target power line branch and the target address.
  • FIG1 is a schematic flow chart of a power line carrier communication method provided in Example 1 of the present application.
  • FIG2 is a schematic diagram of an implementation scenario of a power line carrier communication method provided in Example 1 of the present application.
  • FIG3 is a schematic diagram of a topological relationship provided in Example 1 of the present application.
  • FIG4 is a schematic diagram of another implementation scenario of a power line carrier communication method provided in Example 1 of the present application.
  • FIG5 is a schematic diagram of another implementation scenario of a power line carrier communication method provided in Example 1 of the present application.
  • FIG6 is a schematic flow chart of a power line carrier communication method provided in Example 2 of the present application.
  • FIG7 is a schematic flow chart of a power line carrier communication method provided in Example 3 of the present application.
  • FIG8 is a schematic flow chart of a power line carrier communication method provided in Example 4 of the present application.
  • FIG9 is a schematic flow chart of a power line carrier communication method provided in Example 5 of the present application.
  • FIG10 is a schematic flow chart of a power line carrier communication method provided in Example 6 of the present application.
  • FIG11 is a schematic flow chart of a power line carrier communication method provided in Example 7 of the present application.
  • FIG12 is a schematic diagram of an implementation scenario of a power line carrier communication method provided in Example 7 of the present application.
  • FIG13 is a schematic flow chart of a power line carrier communication method provided in Example 8 of the present application.
  • FIG14 is a schematic flow chart of a power line carrier communication method provided in Example 9 of the present application.
  • FIG15 is a schematic diagram of the structure of a power line carrier communication device provided in the present application.
  • the power line carrier communication method provided in the present application can be applied to a photovoltaic system, and the photovoltaic system includes: at least one master node and at least one slave node.
  • a flow chart of a power line carrier communication method provided in Embodiment 1 of the present application is shown in FIG. 1. The method may include but is not limited to the following steps:
  • Step S101 A master node sends at least one debugging frame to at least one slave node based on a target power line branch.
  • each master node may correspond to at least one power line branch, each power line branch may be connected to a slave node, and the slave nodes connected to each power line branch may be different.
  • the master node is correspondingly provided with a PLC master node
  • the slave node is correspondingly provided with a PLC slave node.
  • the PLC master node can use coupling technology to modulate each debug frame in at least one debug frame, obtain a master node debug signal corresponding to each debug frame, obtain at least one master node debug signal, and send at least one master node debug signal to the slave node based on the target power line branch.
  • the coupling technology may be, but is not limited to: Magnetic ring coupling technology.
  • the master node may include but is not limited to: an inverter, and the slave node may include but is not limited to: a combiner box or an optimizer.
  • the inverter may include at least one inverter unit, each of the at least one inverter unit may be respectively provided with a PLC master node, each inverter unit may correspond to a plurality of slave nodes, and each slave node may be respectively provided with a PLC slave node.
  • Step S102 The master node receives at least one response frame corresponding to each debug frame in at least one debug frame.
  • the response frame corresponds to one of the at least one slave node, and the response frame at least includes an address of the slave node.
  • the slave node corresponding to the target power line branch can obtain at least one master node debugging signal from the target power line branch through the PLC slave node, demodulate each master node debugging signal in the at least one master node debugging signal to obtain each debugging frame, respond to each debugging frame to obtain each response frame, and through coupling technology, modulate each response frame into each slave node response signal, and send the slave node response signal to the master node based on the target power line branch.
  • the master node may receive at least one slave node response signal corresponding to each master node debugging signal in at least one master node debugging signal through the PLC master node.
  • the master node when the master node corresponds to multiple power line branches, crosstalk may occur between the multiple power line branches, and at least one debug frame may reach the slave nodes corresponding to other power line branches other than the target power line branch. Therefore, in addition to receiving the response frame of the slave node corresponding to the target power line branch, the master node may also receive the response frame of the slave nodes corresponding to other power line branches.
  • the PLC slave nodes set by each slave node start timing at the same time, and the PLC slave nodes reply the response frame to the PLC master node in turn according to the bound slave node address time slice (e.g., 40ms).
  • the PLC slave node set by slave node 1 replies to the response frame at 40ms
  • the PLC slave node set by slave node 2 replies to the response frame at 80ms
  • the PLC slave node set by slave node 3 replies to the response frame at 120ms
  • the PLC slave node set by slave node 4 replies to the response frame at 160ms
  • the PLC slave node set by slave node 5 replies to the response frame at 200ms.
  • At least one response frame corresponding to each debugging frame contains the slave corresponding to the target power line branch.
  • the response frame of the node may also include response frames of slave nodes corresponding to other power line branches except the target power line branch.
  • Step S103 The master node determines the signal strength corresponding to each response frame in at least one response frame corresponding to each debug frame.
  • the master node After obtaining at least one response frame corresponding to each debugging frame through the PLC master node, the master node can determine the signal strength corresponding to each response frame based on each response frame.
  • the signal strength corresponding to each response frame may include but is not limited to: dBuv (signal voltage strength).
  • Step S104 The master node determines a target address that meets a set signal strength condition from the addresses of the slave nodes corresponding to each response frame based on the signal strength corresponding to each response frame.
  • the signal strength corresponding to the response frame received by the master node from the target power line branch through the PLC master node is different from the signal strength corresponding to the response frame transmitted by other power line branches.
  • the target address that meets the set signal strength condition can be determined from the address of the slave node corresponding to each response frame.
  • the signal strength condition can be set as needed and is not limited in this application.
  • the target address that meets the set signal strength condition can be used as the address of the combiner box actually corresponding to the target power line branch.
  • Step S104 may include but is not limited to:
  • a target address that meets the set signal strength condition is determined from the address of the combiner box corresponding to each response frame.
  • Step S105 The master node establishes a topological relationship between the target power line branch and the target address.
  • steps S101-S105 are the execution process for one power line branch corresponding to the master node. If the master node corresponds to multiple power line branches, step S101 may include but is not limited to:
  • the master node selects one of the multiple power line branches in turn as a target power line branch, and sends at least one debugging frame to at least one slave node based on the target power line branch.
  • the master node may respectively establish a topological relationship between each power line branch and its target address.
  • the master node selects one of the multiple power line branches in turn as the target power line branch. And reserve a set time to wait for the slave node to respond.
  • the set time can be set as needed and is not limited in this application. For example, the set time can be set to 2 seconds.
  • the master node sends at least one debug frame to at least one slave node based on the target power line branch, receives at least one response frame corresponding to each debug frame in the at least one debug frame, determines the signal strength corresponding to each response frame in the at least one response frame corresponding to each debug frame, and based on the signal strength corresponding to each response frame, determines the target address that meets the set signal strength condition from the address of the slave node corresponding to each response frame to obtain the address of the slave node actually corresponding to the target power line branch, and on this basis, establishes a topological relationship between the target power line branch and the target address to ensure the accuracy of the topological relationship.
  • the power line branch actually corresponding to the slave node can be found based on the accurate topological relationship, and data interaction is performed through the actually corresponding power line branch to ensure the reliability of data interaction.
  • the master node is an inverter and the slave node is a combiner box
  • each inverter corresponds to 5 combiner boxes
  • the PLC master node and the PLC slave node send and receive signals through magnetic ring coupling.
  • inverter 1# as an example, the actual wiring method between inverter 1# and the combiner box is shown in part (a) of Figure 2.
  • the power line branch corresponding to ch1 corresponds to combiner box 2
  • the power line branch corresponding to ch2 corresponds to combiner box 3
  • the power line branch corresponding to ch3 corresponds to combiner box 1
  • the power line branch corresponding to ch4 corresponds to combiner box 4
  • the power line branch corresponding to ch5 corresponds to combiner box 5.
  • the message sent to combiner box 1 will be sent to combiner box 1 through the power line branch corresponding to ch1
  • the message sent to combiner box 2 will be sent to combiner box 2 through the power line branch corresponding to ch2
  • the message sent to combiner box 3 will be sent to combiner box 3 through the power line branch corresponding to ch3. Since the actual power line branch is not used to send the message, combiner box 1, combiner box 2 and combiner box 3 may not receive the message, resulting in transmission and reception errors;
  • the power line carrier communication method provided in Example 1 can determine the topological relationship shown in Figure 3. According to the topological relationship shown in Figure 3, data can be sent and received through the actual power line branch shown in part (a) of Figure 2, thereby improving the reliability of data interaction.
  • FIG. 2 is only one example of communication between a master node and a slave node, and does not limit the master node and the slave node.
  • the corresponding inverter includes at least one inverter unit.
  • the master node is an inverter
  • the slave node is a combiner box
  • the inverter includes a plurality of inverter units, and each inverter unit corresponds to five combiner boxes.
  • the PLC master node and the PLC slave node send and receive signals through magnetic ring coupling. Taking the 1# inverter unit as an example, the actual wiring method between the 1# inverter unit and the combiner box is shown in part (a) of Figure 4.
  • the power line branch corresponding to ch1 corresponds to combiner box 2
  • the power line branch corresponding to ch2 corresponds to combiner box 3
  • the power line branch corresponding to ch3 corresponds to combiner box 1
  • the power line branch corresponding to ch4 corresponds to combiner box 4
  • the power line branch corresponding to ch5 corresponds to combiner box 5.
  • the PLC master node of the 1# inverter unit does not know the actual wiring of each power line branch corresponding to the 1# inverter unit, it still sends and receives data according to the topological relationship corresponding to the wiring mode shown in part (b) of FIG4 , and sends the message sent to the combiner box 1 to the combiner box 1 through the power line branch corresponding to ch1, sends the message sent to the combiner box 2 to the combiner box 2 through the power line branch corresponding to ch2, and sends the message sent to the combiner box 3 to the combiner box 3 through the power line branch corresponding to ch3. Since the actual power line branch is not used to send the message, the combiner box 1, the combiner box 2 and the combiner box 3 may not receive the message, resulting in a sending and receiving error;
  • the power line carrier communication method provided in Example 1 can determine the topological relationship shown in Figure 3. According to the topological relationship shown in Figure 3, data can be sent and received through the actual power line branch shown in part (a) of Figure 4, thereby improving the reliability of data interaction.
  • FIG4 is only an example of a master node and a slave node, and does not limit the master node and the slave node.
  • the number of inverter units and the number of combiner boxes are not limited to the inverter units and combiner boxes shown in FIG4, and the inverter units and combiner boxes can be set according to actual project requirements.
  • the master node is an inverter
  • the slave node is a combiner box
  • the inverter has multiple inverter units
  • the power of the inverter unit is 1.1MW, corresponding to a 4.4MW photovoltaic array
  • 4 inverter units are configured, each inverter unit is configured with a PLC master node, and each PLC master node is connected to the data collector through an RS485 bus, as shown in part (a) of Figure 5, inverter unit 1 is configured with a PLC master node of MPLC241, inverter unit 2 is configured with a PLC master node of MPLC242, inverter unit 3 is configured with a PLC master node of MPLC243, and inverter unit 4 is configured with a PLC master node of MPLC244.
  • 1.1MW of DC power in the 4.4MW photovoltaic array is aggregated to the inverter units through 6 combiner boxes, and each inverter unit corresponds to 6 combiner boxes.
  • the target address is determined to be the combiner box address 3, corresponding to the power line branch 2 of inverter unit 1, the target address is determined to be the combiner box address 6, corresponding to the power line branch 3 of inverter unit 1, the target address is determined to be the combiner box address 4, corresponding to the power line branch 4 of inverter unit 1, the target address is determined to be the combiner box address 5, corresponding to the power line branch 1 of inverter unit Line branch 5, the target address is determined to be combiner box address 1, corresponding to the power line branch 6 of the inverter unit 1, and the target address is determined to be combiner box address 2.
  • a topological relationship is established for power line branch 1, that is, branch number 1 corresponds to combiner box address 3; a topological relationship is established for power line branch 2, that is, branch number 2 corresponds to combiner box address 6; a topological relationship is established for power line branch 3, that is, branch number 3 corresponds to combiner box address 4; a topological relationship is established for power line branch 4, that is, branch number 4 corresponds to combiner box address 5; a topological relationship is established for power line branch 5, that is, branch number 5 corresponds to combiner box address 1; and a topological relationship is established for power line branch 6, that is, branch number 6 corresponds to combiner box address 2.
  • step S103 may include but is not limited to the following steps:
  • Step S1031 The master node determines the signal strength of a slave node response signal corresponding to each response frame in at least one response frame corresponding to each debug frame.
  • the master node can determine the signal strength of each slave node response signal in at least one slave node response signal when receiving at least one slave node response signal corresponding to each master node debugging signal through the PLC master node.
  • step S104 may include but is not limited to:
  • the master node determines a target address that meets a set signal strength condition from the addresses of the slave nodes corresponding to each response frame based on the signal strength of the response signal of the slave node corresponding to each response frame.
  • the master node sends at least one debug frame to at least one slave node based on the target power line branch, receives at least one response frame corresponding to each debug frame in the at least one debug frame, determines the signal strength of the slave node response signal corresponding to each response frame in the at least one response frame corresponding to each debug frame, and based on the signal strength of the slave node response signal corresponding to each response frame, determines the target address that meets the set signal strength condition from the address of the slave node corresponding to each response frame to obtain the address of the slave node actually corresponding to the target power line branch, and on this basis, establishes a topological relationship between the target power line branch and the target address to ensure the accuracy of the topological relationship.
  • the power line branch actually corresponding to the slave node can be found based on the accurate topological relationship, and data interaction is performed through the actually corresponding power line branch to ensure the reliability of data interaction.
  • step S102 may include but is not limited to the following steps:
  • Step S1021 the master node receives at least one response frame corresponding to each debug frame in at least one debug frame, the response frame corresponds to one of the at least one slave nodes, and the response frame includes the address of the slave node and the signal strength of the master node debug signal corresponding to the debug frame.
  • the slave node may receive the master node debugging signal corresponding to the debugging frame through the PLC slave node, and determine the signal strength of the master node debugging signal.
  • step S103 may include but is not limited to the following steps:
  • Step S1032 The master node determines the signal strength of a signal returned by the slave node corresponding to each response frame in at least one response frame corresponding to each debug frame.
  • step S1032 can refer to the relevant introduction of step S1031 in embodiment 2, which will not be repeated here.
  • Step S1033 The master node obtains the signal strength of the master node debugging signal corresponding to the debugging frame in each response frame.
  • Step S1034 Determine the signal strength corresponding to the response frame based on the signal strength of the slave node return signal corresponding to the response frame and the signal strength of the master node debugging signal corresponding to the debugging frame in the response frame.
  • Step S1034 may include but is not limited to:
  • the signal strength of the slave node return signal corresponding to the response frame and the signal strength of the master node debugging signal corresponding to the debugging frame in the response frame are averaged to obtain an average signal strength value, and the average signal strength value is determined as the signal strength corresponding to the response frame.
  • the response frame includes the address of the slave node and the signal strength of the master node debugging signal corresponding to the debug frame
  • the specific implementation method of the power line carrier communication method is not limited to the power line carrier communication method provided in this embodiment.
  • the response frame includes the address of the slave node and the signal strength of the master node debugging signal corresponding to the debug frame, all implementable methods of the power line carrier communication method should be protected in this application.
  • the master node determines the signal strength of the slave node return signal corresponding to each response frame in at least one response frame corresponding to each debug frame, and the master node obtains the signal strength of the master node debug signal corresponding to the debug frame in each response frame, based on the signal strength of the slave node return signal corresponding to the response frame.
  • the signal strength of the master node debugging signal corresponding to the debugging frame in the strength and response frame is determined to determine the signal strength corresponding to the response frame, which can ensure the reliability of the signal strength corresponding to the response frame.
  • the target address that meets the set signal strength condition is determined from the address of the slave node corresponding to each response frame.
  • the accuracy of the target address can be improved to obtain the address of the junction box actually corresponding to the power line branch.
  • the topological relationship between the target power line branch and the target address is established to ensure the accuracy of the topological relationship.
  • the power line branch actually corresponding to the slave node can be found based on the accurate topological relationship, and data interaction is carried out through the actually corresponding power line branch to ensure the reliability of data interaction.
  • step S104 may include but is not limited to the following steps:
  • Step S1041 If at least one debugging frame has one, the master node compares the signal strengths corresponding to each response frame, and determines the target response frame with the strongest signal strength from each response frame.
  • Step S1042 The master node determines the address of the slave node in the target response frame as the target address.
  • the master node sends at least one debug frame to at least one slave node based on the target power line branch, receives at least one response frame corresponding to each debug frame in the at least one debug frame, determines the signal strength corresponding to each response frame in the at least one response frame corresponding to each debug frame, and if at least one debug frame has one, the master node compares the signal strengths corresponding to each response frame, determines the target response frame with the strongest signal strength from each response frame, determines the address of the slave node in the target response frame as the target address, so as to obtain the address of the slave node actually corresponding to the target power line branch, and on this basis, establishes a topological relationship between the target power line branch and the target address to ensure the accuracy of the topological relationship.
  • the power line branch actually corresponding to the slave node can be found based on the accurate topological relationship, and data interaction is performed through the actually corresponding power line branch to ensure the reliability of data interaction.
  • step S104 may include but is not limited to the following steps:
  • Step S1043 If there are multiple debug frames, the master node generates a corresponding slave frame based on each of the corresponding slave frames. The address of the node is determined from each response frame to determine the response frame corresponding to the address of each slave node.
  • the same slave node may return multiple response frames, and the addresses of the slave nodes corresponding to the multiple response frames returned by the same slave node are the same, that is, each slave node address may correspond to multiple response frames.
  • the address of the slave node corresponding to each response frame can be compared, and the response frames with the same address of the slave node can be divided into a group to obtain multiple groups of response frames, and the response frames in each group of response frames are used as the response frames corresponding to the address of the corresponding slave node.
  • Step S1044 The master node determines the signal strength corresponding to the address of each slave node based on the signal strength corresponding to the response frame corresponding to the address of each slave node.
  • Step S1044 may include but is not limited to:
  • the master node determines the average value and/or variance value of the signal strength corresponding to the response frame corresponding to the address of each slave node respectively, and determines the average value and/or variance value as the signal strength corresponding to the address of the slave node.
  • Step S1045 The master node compares the signal strength corresponding to the address of each slave node, and determines the target address with the strongest signal strength from the addresses of each slave node.
  • the master node compares the signal strength corresponding to the address of each slave node, determines the address of the slave node with the strongest signal strength from the addresses of each slave node, and determines the address of the slave node with the strongest signal strength as the target address.
  • multiple debugging frames are sent based on the target power line branch
  • the master node determines the response frame corresponding to the address of each slave node from each response frame based on the address of the slave node corresponding to each response frame
  • the master node determines the signal strength corresponding to the address of each slave node based on the signal strength corresponding to the response frame corresponding to the address of each slave node
  • the master node compares the signal strength corresponding to the address of each slave node, and determines the target address with the strongest signal strength from the address of each slave node, thereby improving the accuracy of the target address.
  • FIG. 10 is a flow chart of a power line carrier communication method provided in Embodiment 6 of the present application
  • this embodiment is mainly an extended solution of the power line carrier communication method provided in Embodiment 1 above, as shown in FIG. 10, it may include but is not limited to the following steps:
  • Step S201 The master node selects one of multiple power line branches in turn as a target power line branch.
  • Step S202 The master node sends at least one debugging frame to at least one slave node based on the target power line branch.
  • Step S203 The master node receives at least one response frame corresponding to each debug frame in at least one debug frame, the response frame corresponds to one of the at least one slave node, and the response frame at least includes an address of the slave node.
  • Step S204 The master node determines the signal strength corresponding to each response frame in at least one response frame corresponding to each debug frame.
  • Step S205 The master node determines a target address that meets the set signal strength condition from the addresses of the slave nodes corresponding to each response frame based on the signal strength corresponding to each response frame.
  • steps S202-S205 can refer to the relevant introduction of steps S101-S104 in Example 1, which will not be repeated here.
  • steps S202 to S205 need to be performed.
  • steps S202 to S205 are performed for each target power line branch, a target address corresponding to each target power line branch can be determined.
  • Step S206 When the master node determines the target address for each target power line branch, it determines that there are duplicate addresses in the target addresses corresponding to each target power line branch, and performs deduplication processing on the target addresses corresponding to each target power line branch.
  • deduplication processing is performed on the target address corresponding to each target power line branch, which may include but is not limited to:
  • the usable address is different from the target address corresponding to each target power line branch except the target addresses corresponding to the target power line branches with repeated addresses.
  • Step S207 The master node establishes a topological relationship between each target power line branch and the target address corresponding to each target power line branch after deduplication processing.
  • the topological relationship is established, which can improve the accuracy of the topological relationship.
  • Step S207 is a specific implementation of step S105 in Example 1.
  • FIG. 10 is only a schematic diagram of various steps included in the power line carrier communication method, and it does not serve as a limitation on the actual implementation of the power line carrier communication method. Steps S202-S20 in FIG. 10 are applicable to Each target power line branch.
  • steps S201-S205 and step S105 in the above embodiment 1 may also be one implementation of the power line carrier communication method, which is also protected in this application.
  • FIG. 11 is a flow chart of a power line carrier communication method provided in Embodiment 7 of the present application
  • this embodiment is mainly an extension scheme of the power line carrier communication method provided in Embodiment 1 above, as shown in FIG. 11, it may include but is not limited to the following steps:
  • Step S301 A master node sends at least one debugging frame to at least one slave node based on a target power line branch.
  • Step S302 The master node receives at least one response frame corresponding to each debug frame in at least one debug frame, the response frame corresponds to one of the at least one slave node, and the response frame at least includes an address of the slave node.
  • Step S303 The master node determines the signal strength corresponding to each response frame in at least one response frame corresponding to each debug frame.
  • Step S304 The master node determines a target address that meets the set signal strength condition from the addresses of the slave nodes corresponding to each response frame based on the signal strength corresponding to each response frame.
  • Step S305 The master node establishes a topological relationship between the target power line branch and the target address.
  • steps S301-S205 can refer to the relevant introduction of steps S101-S105 in Example 1, which will not be repeated here.
  • Step S306 The master node obtains the communication message.
  • the data collector may send a communication message, wherein the communication message includes the target slave node address.
  • the communication message may be, but is not limited to, a Modbus standard communication message.
  • Each master node will receive the communication message, but only the master node whose target address in the topology is consistent with the target slave node address will process and respond to the communication message.
  • the master node is a centralized inverter and the slave node is a combiner box
  • the PLC master node of each inverter unit of the centralized inverter will receive the communication message, but only the PLC master node whose target address in the topology is consistent with the target combiner box address will process and respond to the communication message.
  • the node will process and respond to the communication message.
  • the PLC master node may include but is not limited to: a power supply, a PLC master control chip, a PA amplifier circuit, an electronic switch circuit and a coupling channel.
  • Each coupling channel can be individually controlled to be turned on or off by a GPIO pin of the PLC master control chip.
  • Each coupling channel corresponds to a power line branch.
  • the coupling channel is used to modulate the data frame (such as the debugging frame) based on the PLC main control chip to obtain the main node debugging signal corresponding to the data frame, and send the main node debugging signal to the power line branch.
  • Step S307 If the target slave node address in the communication message is consistent with the target address in the topological relationship, the master node sends the communication message to the target power line branch in the topological relationship, so that the slave node corresponding to the target slave node address receives the communication message from the target power line branch, responds to the communication message, and returns the data corresponding to the slave node corresponding to the target slave node address.
  • the power line branch corresponding to coupling channel 1 corresponds to combiner box 2
  • the power line branch corresponding to coupling channel 2 corresponds to combiner box 3
  • the power line branch corresponding to coupling channel 3 corresponds to combiner box 1
  • the power line branch corresponding to coupling channel 4 corresponds to combiner box 4
  • the power line branch corresponding to coupling channel 5 corresponds to combiner box 5
  • the PLC main control chip opens the electronic switch circuit 1 through the GPIO pin to open the coupling channel 1
  • the PLC main control chip sends the communication message of the digital signal to the coupling channel 1
  • the coupling channel 1 modulates the communication message into an analog carrier signal
  • the PA power amplifier circuit amplifies the analog carrier signal and transmits the obtained level to the magnetic ring coil, and uses the magnetic ring coil to couple the communication message to the power line branch corresponding to the combiner box 2.
  • the PLC slave node corresponding to the combiner box 2 receives the analog carrier signal from the PLC master node through the magnetic ring coil coupling, restores the analog carrier signal into a digital signal, that is, a communication message, and sends the communication message to the main control chip of the combiner box 2 through the serial port.
  • the master chip of combiner box 2 determines that the target combiner box address in the communication message matches the address of combiner box 2, it starts to respond and generates a response message, which contains the data corresponding to the combiner box (such as the voltage data and current data of the photovoltaic panel).
  • the master chip of combiner box 2 sends the response message to the PLC slave node through the serial port, and the PLC slave node then sends the response message to the PLC master node in reverse.
  • the PLC master node can report the response message to the data collector to complete a round of data collection.
  • the communication message can be accurately sent to the combiner box, thereby ensuring the reliability of data interaction.
  • FIG. 13 is a flow chart of a power line carrier communication method provided in Embodiment 8 of the present application
  • this embodiment is mainly an extension scheme of the power line carrier communication method provided in Embodiment 1 above, as shown in FIG. 13, it may include but is not limited to the following steps:
  • Step S401 The master node selects one of multiple power line branches in turn as a target power line branch.
  • Step S402 The master node sends at least one debugging frame to at least one slave node based on the target power line branch.
  • Step S403 The master node receives at least one response frame corresponding to each debug frame in at least one debug frame, the response frame corresponds to one of the at least one slave node, and the response frame at least includes an address of the slave node.
  • Step S404 The master node determines the signal strength corresponding to each response frame in at least one response frame corresponding to each debug frame.
  • Step S405 The master node determines a target address that meets the set signal strength condition from the addresses of the slave nodes corresponding to each response frame based on the signal strength corresponding to each response frame.
  • steps S402-S405 can refer to the relevant introduction of steps S101-S104 in Example 1, which will not be repeated here.
  • Step S406 The master node establishes a topological relationship between the target power line branch and the target address.
  • This step can be understood as: when a target address is determined for a target power line branch, the master node establishes a topological relationship between the target power line branch and the target address.
  • This step can also be understood as: when the master node determines the target address for each target power line branch, the master node establishes a topological relationship between each target power line branch and the target address corresponding to the target power line branch.
  • steps S402-S406 can refer to the relevant introduction of steps S101-S105 in Example 1, which will not be repeated here.
  • Step S407 The master node stores a topological relationship between each target power line branch and a target address corresponding to the target power line branch.
  • FIG. 13 is only used to illustrate the various steps included in the power line carrier communication method, and does not serve as a limitation on the actual implementation of the power line carrier communication method. Steps S402-S405 in FIG. 13 are applicable to each target power line branch.
  • FIG. 14 is a flow chart of a power line carrier communication method provided in Embodiment 9 of the present application
  • this embodiment is mainly an extension scheme of the power line carrier communication method provided in Embodiment 1 above, as shown in FIG. 14, it may include but is not limited to the following steps:
  • Step S501 A master node sends at least one debugging frame to at least one slave node based on a target power line branch.
  • Step S502 The master node receives at least one response frame corresponding to each debug frame in at least one debug frame, the response frame corresponds to one of the at least one slave node, and the response frame at least includes an address of the slave node.
  • Step S503 The master node determines the signal strength corresponding to each response frame in at least one response frame corresponding to each debug frame.
  • Step S504 The master node determines a target address that meets the set signal strength condition from the addresses of the slave nodes corresponding to each response frame based on the signal strength corresponding to each response frame.
  • Step S505 The master node establishes a topological relationship between the target power line branch and the target address.
  • steps S501-S505 can refer to the relevant introduction of steps S101-S105 in Example 1, which will not be repeated here.
  • Step S506 The master node exchanges data with the slave node corresponding to the target power line branch based on the topological relationship.
  • the master node can find the actual power line branch (ie, the target power line branch) between the master node and the slave node based on the topological relationship, and perform data interaction through the actual power line branch to ensure the reliability of data interaction.
  • the actual power line branch ie, the target power line branch
  • a power line carrier communication device provided by the present application is introduced.
  • the power line carrier communication device introduced below and the power line carrier communication method introduced above can be referred to each other.
  • the power line carrier communication device includes: a sending module 100 , a receiving module 200 , a first determining module 300 , a second determining module 400 and an establishing module 500 .
  • the sending module 100 is used to send at least one Debug frame.
  • the receiving module 200 is used to receive at least one response frame corresponding to each debug frame in at least one debug frame, the response frame corresponds to one of the at least one slave node, and the response frame at least includes an address of the slave node.
  • the first determining module 300 is configured to determine a signal strength corresponding to each response frame in at least one response frame corresponding to each debugging frame.
  • the second determination module 400 is configured to determine, based on the signal strength corresponding to each response frame, a target address that meets a set signal strength condition from the addresses of the slave nodes corresponding to each response frame.
  • the establishing module 500 is used to establish a topological relationship between a target power line branch and a target address.
  • the power line carrier communication device may further include:
  • the data interaction module is used to interact with the slave nodes corresponding to the target power line branches based on the topological relationship.
  • the sending module 100 may be specifically used for:
  • One of the multiple power line branches is selected in turn as a target power line branch, and at least one debugging frame is sent to at least one slave node based on the target power line branch.
  • the first determination module 300 may be specifically used for:
  • the signal strength of the slave node response signal corresponding to each response frame in at least one response frame corresponding to each debugging frame is determined.
  • the response frame also includes the signal strength of the master node debugging signal corresponding to the debugging frame. Accordingly, the first determination module 300 can be specifically used to:
  • the signal strength corresponding to the response frame is determined based on the signal strength of the slave node return signal corresponding to the response frame and the signal strength of the master node debugging signal corresponding to the debugging frame in the response frame.
  • the second determining module 400 can be specifically used to:
  • the address of the slave node in the target response frame is determined as the target address.
  • the second determining module 400 may be specifically used to:
  • the signal strengths corresponding to the addresses of each slave node are compared, and the target address with the strongest signal strength is determined from the addresses of each slave node.
  • the process of the second determining module 400 determining the signal strength corresponding to the address of each slave node based on the signal strength corresponding to the response frame corresponding to the address of each slave node may specifically include:
  • the average value and/or variance value of the signal strength corresponding to the response frame corresponding to the address of each slave node is determined respectively, and the average value and/or variance value is determined as the signal strength corresponding to the address of the slave node.
  • the power line carrier communication device may further include:
  • a first obtaining module used to obtain a target address corresponding to each power line branch
  • the deduplication module is used to determine whether there are duplicate addresses in the target address corresponding to each power line branch, and to perform deduplication processing on the target address corresponding to each power line branch.
  • the power line carrier communication device may further include:
  • a second obtaining module used for obtaining a communication message
  • a message sending module is used to send the communication message to the target power line branch in the topological relationship if the target slave node address in the communication message is consistent with the target address in the topological relationship, so that the slave node corresponding to the target slave node address receives the communication message from the target power line branch, responds to the communication message, and returns the data corresponding to the slave node corresponding to the target slave node address.
  • the power line carrier communication device may further include:
  • the storage module is used to store the topological relationship between the target power line branch and the target address.
  • photovoltaic system provided by the present application is introduced.
  • the photovoltaic system introduced below and the power line carrier communication method introduced above can be referenced to each other.
  • a photovoltaic system includes: at least one master node and at least one slave node.
  • the master node may include an inverter, and the slave node may include a combiner box or an optimizer.
  • the inverter can be a centralized inverter; for the optimizer, the inverter can be It is a string inverter.
  • the response frame corresponding to one of the combiner boxes or optimizers corresponding to the inverter, and the response frame at least including an address of the combiner box or the optimizer;
  • the combiner box or the optimizer is used to respond to the debugging frame and return a response frame to the inverter.
  • each embodiment focuses on the differences from other embodiments, and the same or similar parts between the embodiments can be referred to each other.
  • the description is relatively simple, and the relevant parts can be referred to the partial description of the method embodiment.
  • the computer software product may be stored in a storage medium, such as ROM/RAM, a magnetic disk, or an optical disk, and may include a number of instructions for enabling a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the methods described in the various embodiments or certain parts of the embodiments of the present application.
  • a computer device which may be a personal computer, a server, or a network device, etc.

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Abstract

本申请提供了一种电力线载波通信方法、装置及光伏系统，该方法包括：主节点基于目标电力线支路向至少一个从节点发送至少一个调试帧；主节点接收至少一个调试帧中每个调试帧对应的至少一个应答帧；主节点确定每个调试帧对应的至少一个应答帧中每个应答帧对应的信号强度；主节点基于每个应答帧对应的信号强度，从每个应答帧对应的从节点的地址中确定出满足设定信号强度条件的目标地址；主节点建立目标电力线支路和目标地址之间的拓扑关系。

Description

一种电力线载波通信方法、装置及光伏系统
本申请要求于2023年05月23日提交中国专利局、申请号为2023106019068、发明名称为“一种电力线载波通信方法、装置及光伏系统”的中国专利申请的优先权，其全部内容引用在本申请中。
技术领域
本申请涉及光伏技术领域，特别涉及一种电力线载波通信方法、装置及光伏系统。
背景技术
在光伏系统中，需要采集逆变器、汇流箱、优化器等设备的发电量、运行参数等数据。
通常，逆变器作为通信的主节点，逆变器下挂的设备(如，汇流箱、优化器)作为通信的从节点，主节点和从节点可以通过PLC(Power Line Communication，电力线载波通信)进行数据交互，以采集相应数据。
但是，主节点往往不能按照主节点和从节点之间的实际电力线支路进行数据收发，导致主节点通过PLC和从节点之间的数据交互不可靠。
发明内容
本申请提供如下技术方案：
本申请一方面提供一种电力线载波通信方法，应用于光伏系统，所述光伏系统包括：至少一个主节点和至少一个从节点，该方法包括：
所述主节点基于目标电力线支路向所述至少一个从节点发送至少一个调试帧；
所述主节点接收所述至少一个调试帧中每个所述调试帧对应的至少一个应答帧，所述应答帧对应所述至少一个从节点中其中一个从节点，所述应答帧至少包含所述从节点的地址；
所述主节点确定每个所述调试帧对应的至少一个应答帧中每个所述应答帧对应的信号强度；
所述主节点基于每个所述应答帧对应的信号强度，从每个所述应答帧对应 的从节点的地址中确定出满足设定信号强度条件的目标地址；
所述主节点建立所述目标电力线支路和所述目标地址之间的拓扑关系。
可选的，所述方法还包括：
所述主节点基于所述拓扑关系与所述目标电力线支路对应的从节点进行数据交互。
可选的，所述主节点基于目标电力线支路向所述至少一个从节点发送至少一个调试帧之前，还包括：
所述主节点从多条电力线支路中依次选择一条作为目标电力线支路。
可选的，所述主节点确定每个所述调试帧对应的至少一个应答帧中每个所述应答帧对应的信号强度，包括：
所述主节点确定每个所述调试帧对应的至少一个应答帧中每个所述应答帧对应的从节点应答信号的信号强度。
可选的，所述应答帧还包含所述调试帧对应的主节点调试信号的信号强度。
可选的，所述主节点确定每个所述调试帧对应的至少一个应答帧中每个所述应答帧对应的信号强度，包括：
所述主节点确定每个所述调试帧对应的至少一个应答帧中每个所述应答帧对应的从节点返回信号的信号强度；
所述主节点获取每个所述应答帧中所述调试帧对应的主节点调试信号的信号强度；
所述主节点基于所述应答帧对应的从节点返回信号的信号强度和所述应答帧中所述调试帧对应的主节点调试信号的信号强度，确定所述应答帧对应的信号强度。
可选的，若所述至少一个调试帧有一个，所述主节点基于每个所述应答帧对应的信号强度，从每个所述应答帧对应的从节点的地址中确定出满足设定信号强度条件的目标地址，包括：
所述主节点对每个所述应答帧对应的信号强度进行比较，从每个所述应答帧中确定出信号强度最强的目标应答帧；
所述主节点将所述目标应答帧中从节点的地址确定为目标地址。
可选的，若所述至少一个调试帧有多个，所述主节点基于每个所述应答帧 对应的信号强度，从每个所述应答帧对应的从节点的地址中确定出满足设定信号强度条件的目标地址，包括：
所述主节点基于每个所述应答帧对应的从节点的地址，从每个所述应答帧中确定出每个从节点的地址对应的应答帧；
所述主节点基于每个所述从节点的地址对应的应答帧对应的信号强度，确定每个所述从节点的地址对应的信号强度；
所述主节点对每个所述从节点的地址对应的信号强度进行比较，从每个所述从节点的地址中确定出信号强度最强的目标地址。
可选的，所述主节点基于每个所述从节点的地址对应的应答帧对应的信号强度，确定每个所述从节点的地址对应的信号强度，包括：
所述主节点分别确定每个所述从节点的地址对应的应答帧对应的信号强度的平均值和/或方差值，将所述平均值和/或方差值确定为所述从节点的地址对应的信号强度。
可选的，所述主节点基于每个所述应答帧对应的信号强度，从每个所述应答帧对应的从节点的地址中确定出满足设定信号强度条件的目标地址之后，还包括：
所述主节点在对每条所述目标电力线支路均确定出目标地址的情况下，确定出每条所述目标电力线支路对应的目标地址中存在重复的地址，对每条所述目标电力线支路对应的目标地址进行去重处理；
所述主节点建立所述目标电力线支路和所述目标地址之间的拓扑关系，包括：
所述主节点建立每条所述目标电力线支路和去重处理后的每条所述目标电力线支路对应的目标地址之间的拓扑关系。
可选的，所述主节点建立所述目标电力线支路和所述目标地址之间的拓扑关系之后，还包括：
所述主节点获得通信报文；
若所述通信报文中目标从节点地址与所述拓扑关系中所述目标地址一致，所述主节点将所述通信报文发送给所述拓扑关系中所述目标电力线支路，以使得所述目标从节点地址对应的从节点从所述目标电力线支路接收所述通信报文，响应所述通信报文，返回所述目标从节点地址对应的从节点对应的数据。
可选的，所述主节点建立所述目标电力线支路和所述目标地址之间的拓扑关系之后，还包括：
所述主节点存储每条所述目标电力线支路和所述目标电力线支路对应的目标地址之间的拓扑关系。
本申请另一方面提供一种电力线载波通信装置，包括：
发送模块，用于基于目标电力线支路向所述至少一个从节点发送至少一个调试帧；
接收模块，用于接收所述至少一个调试帧中每个所述调试帧对应的至少一个应答帧，所述应答帧对应所述至少一个从节点中其中一个从节点，所述应答帧至少包含所述从节点的地址；
第一确定模块，用于确定每个所述调试帧对应的至少一个应答帧中每个所述应答帧对应的信号强度；
第二确定模块，用于基于每个所述应答帧对应的信号强度，从每个所述应答帧对应的从节点的地址中确定出满足设定信号强度条件的目标地址；
建立模块，用于建立所述目标电力线支路和所述目标地址之间的拓扑关系。
本申请第三方面提供一种光伏系统，包括：至少一个主节点和至少一个从节点，所述主节点包括逆变器，所述从节点包括汇流箱或优化器；
所述逆变器，用于：
基于目标电力线支路向所述逆变器对应的汇流箱或优化器发送至少一个调试帧；
接收所述至少一个调试帧中每个所述调试帧对应的至少一个应答帧，所述应答帧对应所述逆变器对应的其中一个汇流箱或优化器，所述应答帧至少包含所述汇流箱或优化器的地址；
确定每个所述调试帧对应的至少一个应答帧中每个所述应答帧对应的信号强度；
基于每个所述应答帧对应的信号强度，从每个所述应答帧对应的汇流箱或优化器的地址中确定出满足设定信号强度条件的目标地址；
建立所述目标电力线支路和所述目标地址之间的拓扑关系；
所述汇流箱或所述优化器，用于响应所述调试帧，向所述逆变器返回应答 帧。
由以上方案可知，本申请公开一种电力线载波通信方法、装置及光伏系统，该电力线载波通信方法应用于光伏系统，光伏系统包括：至少一个主节点和至少一个从节点，该方法包括：主节点基于目标电力线支路向至少一个从节点发送至少一个调试帧；主节点接收至少一个调试帧中每个调试帧对应的至少一个应答帧，应答帧对应至少一个从节点中其中一个从节点，应答帧至少包含从节点的地址；主节点确定每个调试帧对应的至少一个应答帧中每个应答帧对应的信号强度；主节点基于每个应答帧对应的信号强度，从每个应答帧对应的从节点的地址中确定出满足设定信号强度条件的目标地址；主节点建立目标电力线支路和目标地址之间的拓扑关系。
附图说明
为了更清楚地说明本申请实施例中的技术方案，下面将对实施例描述中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本申请的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动性的前提下，还可以根据这些附图获得其他的附图。
图1是本申请实施例1提供的一种电力线载波通信方法的流程示意图；
图2是本申请实施例1提供的一种电力线载波通信方法的一种实施场景示意图；
图3是本申请实施例1提供的一种拓扑关系示意图；
图4是本申请实施例1提供的一种电力线载波通信方法的另一种实施场景示意图；
图5是本申请实施例1提供的一种电力线载波通信方法的再一种实施场景示意图；
图6是本申请实施例2提供的一种电力线载波通信方法的流程示意图；
图7是本申请实施例3提供的一种电力线载波通信方法的流程示意图；
图8是本申请实施例4提供的一种电力线载波通信方法的流程示意图；
图9是本申请实施例5提供的一种电力线载波通信方法的流程示意图；
图10是本申请实施例6提供的一种电力线载波通信方法的流程示意图；
图11是本申请实施例7提供的一种电力线载波通信方法的流程示意图；
图12是本申请实施例7提供的一种电力线载波通信方法的一种实施场景示意图；
图13是本申请实施例8提供的一种电力线载波通信方法的流程示意图；
图14是本申请实施例9提供的一种电力线载波通信方法的流程示意图；
图15是本申请提供的一种电力线载波通信装置的结构示意图。
具体实施方式
下面将结合本申请实施例中的附图，对本申请实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例仅仅是本申请一部分实施例，而不是全部的实施例。基于本申请中的实施例，本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例，都属于本申请保护的范围。
为使本申请的上述目的、特征和优点能够更加明显易懂，下面结合附图和具体实施方式对本申请作进一步详细的说明。
本申请提供的电力线载波通信方法可以应用于光伏系统，光伏系统包括：至少一个主节点和至少一个从节点，参照图1，为本申请实施例1提供的一种电力线载波通信方法的流程示意图，如图1所示，该方法可以包括但并不局限于以下步骤：
步骤S101、主节点基于目标电力线支路向至少一个从节点发送至少一个调试帧。
本实施例中，每个主节点可以分别对应至少一条电力线支路，每条电力线支路可以分别连接一个从节点。每条电力线支路连接的从节点可以各不相同。
主节点对应设置有PLC主节点，从节点对应设置有PLC从节点。
PLC主节点可以利用耦合技术，对至少一个调试帧中每个调试帧进行调制，得到每个调试帧对应的主节点调试信号，得到至少一个主节点调试信号，基于目标电力线支路，向从节点发送至少一个主节点调试信号。
在本申请中，对耦合技术不做限制。例如，耦合技术可以为但不局限于： 磁环耦合技术。
本实施例中，主节点可以包括但不局限于：逆变器，从节点可以包括但不局限于：汇流箱或优化器。
逆变器可以包括至少一个逆变单元，至少一个逆变单元中每个逆变单元可以分别设置有PLC主节点，每个逆变单元可以对应多个从节点，每个从节点可以分别设置有PLC从节点。
步骤S102、主节点接收至少一个调试帧中每个调试帧对应的至少一个应答帧。
应答帧对应至少一个从节点中其中一个从节点，应答帧至少包含从节点的地址。
具体地，目标电力线支路对应的从节点可以通过PLC从节点从目标电力线支路上获取到至少一个主节点调试信号，对至少一个主节点调试信号中每个主节点调试信号进行解调，得到每个调试帧，对每个调试帧进行应答，得到每个应答帧，通过耦合技术，将每个应答帧分别调制为每个从节点应答信号，基于目标电力线支路向主节点发送从节点应答信号。
相应地，主节点可以通过PLC主节点接收到至少一个主节点调试信号中每个主节点调试信号对应的至少一个从节点应答信号。
可以理解的是，在主节点对应多条电力线支路的情况下，多条电力线支路之间可能会发生串扰，至少一个调试帧可能会到达除目标电力线支路之外的其它电力线支路对应的从节点，因此，主节点除了能接收到目标电力线支路对应的从节点的应答帧之外，还可能收到其它电力线支路对应的从节点的应答帧。
其中，各从节点设置的PLC从节点在接收到调试帧后，同时开始计时，PLC从节点按照绑定的从节点地址时间片(如，40ms)依次回复应答帧给PLC主节点。例如，从节点1设置的PLC从节点在第40ms回复应答帧，从节点2设置的PLC从节点在第80ms回复应答帧，从节点3设置的PLC从节点在第120ms回复应答帧，从节点4设置的PLC从节点在第160ms回复应答帧，从节点5设置的PLC从节点在第200ms回复应答帧。
每个调试帧对应的至少一个应答帧中除了包含目标电力线支路对应的从 节点的应答帧，还可能包含除目标电力线支路之外其它电力线支路对应的从节点的应答帧。
步骤S103、主节点确定每个调试帧对应的至少一个应答帧中每个应答帧对应的信号强度。
主节点通过PLC主节点在获得每个调试帧对应的至少一个应答帧之后，可以基于每个应答帧，确定每个应答帧对应的信号强度。
其中，每个应答帧对应的信号强度可以包括但不局限于：dBuv(信号电压强度)。
步骤S104、主节点基于每个应答帧对应的信号强度，从每个应答帧对应的从节点的地址中确定出满足设定信号强度条件的目标地址。
可以理解的是，主节点通过PLC主节点从目标电力线支路接收到的应答帧对应的信号强度，与其它电力线支路传输的应答帧对应的信号强度具有差异，通过对比每个应答帧对应的信号强度，可以从每个应答帧对应的从节点的地址中确定出满足设定信号强度条件的目标地址。
设定信号强度条件可以根据需要进行设置，在本申请中不做限制。
满足设定信号强度条件的目标地址可以作为目标电力线支路实际对应的汇流箱的地址。
步骤S104可以包括但不局限于：
对每个应答帧对应的信号强度进行归一化处理，得到每个应答帧对应的归一化后信号强度；
基于每个应答帧对应的归一化后信号强度，从每个应答帧对应的汇流箱的地址中确定出满足设定信号强度条件的目标地址。
步骤S105、主节点建立目标电力线支路和目标地址之间的拓扑关系。
可以理解的是，步骤S101-S105为针对主节点对应的一条电力线支路的执行过程。如果主节点对应多条电力线支路，步骤S101可以包括但不局限于：
S1011、主节点从多条电力线支路中依次选择一条作为目标电力线支路，基于目标电力线支路向至少一个从节点发送至少一个调试帧。
对应S1011的实施方式，主节点可以分别建立每条电力线支路和其目标地址之间的拓扑关系。
具体地，主节点从多条电力线支路中依次选择一条作为目标电力线支路， 并预留设定时间等待从节点应答。设定时间可以根据需要进行设置，在本申请中不做限制。例如，设定时间可以设置为2秒。
在本实施例中，主节点基于目标电力线支路向至少一个从节点发送至少一个调试帧，接收至少一个调试帧中每个调试帧对应的至少一个应答帧，确定每个调试帧对应的至少一个应答帧中每个应答帧对应的信号强度，基于每个应答帧对应的信号强度，从每个应答帧对应的从节点的地址中确定出满足设定信号强度条件的目标地址，以获得目标电力线支路实际对应的从节点的地址，在此基础上，建立目标电力线支路和目标地址之间的拓扑关系，保证拓扑关系的准确性，在需要与从节点进行数据交互的情况下，可以基于准确的拓扑关系找到从节点实际对应的电力线支路，通过实际对应的电力线支路进行数据交互，保证数据交互的可靠性。例如，若主节点为逆变器，从节点为汇流箱，每个逆变器对应5个汇流箱，PLC主节点和PLC从节点通过磁环耦合收发信号，以1#逆变器为例，1#逆变器和汇流箱之间的实际接线方式如图2中(a)部分所示，ch1对应的电力线支路对应汇流箱2，ch2对应的电力线支路对应汇流箱3，ch3对应的电力线支路对应汇流箱1，ch4对应的电力线支路对应汇流箱4，ch5对应的电力线支路对应汇流箱5。
如果1#逆变器的PLC主节点不知道1#逆变器对应的各电力线支路的实际接线，仍按照如图2中(b)部分所示的接线方式对应的拓扑关系进行数据收发，会将发给汇流箱1的报文通过ch1对应的电力线支路发送给汇流箱1，将发给汇流箱2的报文通过ch2对应的电力线支路发送给汇流箱2，将发给汇流箱3的报文通过ch3对应的电力线支路发送给汇流箱3，由于并未使用实际电力线支路发送报文，使得汇流箱1、汇流箱2和汇流箱3可能接收不到报文，造成收发错误；
通过实施例1提供的电力线载波通信方法可以确定如图3所示的拓扑关系，按照如图3所示的拓扑关系，可以通过如图2中(a)部分所示的实际电力线支路进行数据收发，提高数据交互的可靠性。
需要说明的是，图2仅为主节点和从节点进行通信的其中一种示例，其并不作为对主节点和从节点的限制。
对应逆变器包括至少一个逆变单元的实施方式，例如，若主节点为逆变器，从节点为汇流箱，逆变器包括多个逆变单元，每个逆变单元对应5个汇流箱， PLC主节点和PLC从节点通过磁环耦合收发信号，以1#逆变单元为例，1#逆变单元和汇流箱之间的实际接线方式如图4中(a)部分所示，ch1对应的电力线支路对应汇流箱2，ch2对应的电力线支路对应汇流箱3，ch3对应的电力线支路对应汇流箱1，ch4对应的电力线支路对应汇流箱4，ch5对应的电力线支路对应汇流箱5。
如果1#逆变单元的PLC主节点不知道1#逆变单元对应的各电力线支路的实际接线，仍按照如图4中(b)部分所示的接线方式对应的拓扑关系进行数据收发，会将发给汇流箱1的报文通过ch1对应的电力线支路发送给汇流箱1，将发给汇流箱2的报文通过ch2对应的电力线支路发送给汇流箱2，将发给汇流箱3的报文通过ch3对应的电力线支路发送给汇流箱3，由于并未使用实际电力线支路发送报文，使得汇流箱1、汇流箱2和汇流箱3可能接收不到报文，造成收发错误；
通过实施例1提供的电力线载波通信方法可以确定如图3所示的拓扑关系，按照如图3所示的拓扑关系，可以通过如图4中(a)部分所示的实际电力线支路进行数据收发，提高数据交互的可靠性。
需要说明的是，图4仅为主节点和从节点的其中一种示例，其并不作为对主节点和从节点的限制。其中，逆变单元的数量和汇流箱的数量并不限于图4所示的逆变单元和汇流箱，可以根据实际项目需求设定逆变单元和汇流箱。例如，若主节点为逆变器，从节点为汇流箱，逆变器具有多个逆变单元，逆变单元的功率为1.1MW，对应4.4MW的光伏方阵，配置4个逆变单元，每个逆变单元分别配置一个PLC主节点，各PLC主节点通过RS485总线连接数据采集器，如图5中(a)部分所示，逆变单元1配置PLC主节点为MPLC241，逆变单元2配置PLC主节点为MPLC242，逆变单元3配置PLC主节点为MPLC243，逆变单元4配置PLC主节点为MPLC244。4.4MW的光伏方阵中1.1MW的直流电能通过6个汇流箱汇总给逆变单元，每个逆变单元分别对应6个汇流箱。
以逆变单元1为例，对应逆变单元1的电力线支路1，确定目标地址为汇流箱地址3，对应逆变单元1的电力线支路2，确定目标地址为汇流箱地址6，对应逆变单元1的电力线支路3，确定目标地址为汇流箱地址4，对应逆变单元1的电力线支路4，确定目标地址为汇流箱地址5，对应逆变单元1的电力 线支路5，确定目标地址为汇流箱地址1，对应逆变单元1的电力线支路6，确定目标地址为汇流箱地址2。
如图5中(b)部分所示，对电力线支路1建立拓扑关系为支路编号1对应汇流箱地址3，对电力线支路2建立拓扑关系为支路编号2对应汇流箱地址6，对电力线支路3建立拓扑关系为支路编号3对应汇流箱地址4，对电力线支路4建立拓扑关系为支路编号4对应汇流箱地址5，对电力线支路5建立拓扑关系为支路编号5对应汇流箱地址1，对电力线支路6建立拓扑关系为支路编号6对应汇流箱地址2。
作为本申请另一可选实施例，参照图6，为本申请实施例2提供的一种电力线载波通信方法的流程示意图，本实施例主要是对上述实施例1中步骤S103的细化方案，如图6所示，步骤S103可以包括但不局限于以下步骤：
步骤S1031、主节点确定每个调试帧对应的至少一个应答帧中每个应答帧对应的从节点应答信号的信号强度。
本实施例中，对应将每个应答帧分别调制为每个从节点应答信号的实施方式，主节点通过PLC主节点在接收到每个主节点调试信号对应的至少一个从节点应答信号的情况下，可以确定至少一个从节点应答信号中每个从节点应答信号的信号强度。
相应地，步骤S104可以包括但不局限于：
S1041、主节点基于每个应答帧对应的从节点应答信号的信号强度，从每个应答帧对应的从节点的地址中确定出满足设定信号强度条件的目标地址。
在本实施例中，主节点基于目标电力线支路向至少一个从节点发送至少一个调试帧，接收至少一个调试帧中每个调试帧对应的至少一个应答帧，确定每个调试帧对应的至少一个应答帧中每个应答帧对应的从节点应答信号的信号强度，基于每个应答帧对应的从节点应答信号的信号强度，从每个应答帧对应的从节点的地址中确定出满足设定信号强度条件的目标地址，以获得目标电力线支路实际对应的从节点的地址，在此基础上，建立目标电力线支路和目标地址之间的拓扑关系，保证拓扑关系的准确性，在需要与从节点进行数据交互的情况下，可以基于准确的拓扑关系找到从节点实际对应的电力线支路，通过实际对应的电力线支路进行数据交互，保证数据交互的可靠性。
作为本申请另一可选实施例，参照图7，为本申请实施例3提供的一种电力线载波通信方法的流程示意图，本实施例主要是对上述实施例1中步骤S102和步骤S103的细化方案，如图7所示，步骤S102可以包括但不局限于以下步骤：
步骤S1021、主节点接收至少一个调试帧中每个调试帧对应的至少一个应答帧，应答帧对应至少一个从节点中其中一个从节点，应答帧包含从节点的地址和调试帧对应的主节点调试信号的信号强度。
本实施例中，从节点可以通过PLC从节点接收调试帧对应的主节点调试信号，确定主节点调试信号的信号强度。
对应步骤S1021，步骤S103可以包括但不局限于以下步骤：
步骤S1032、主节点确定每个调试帧对应的至少一个应答帧中每个应答帧对应的从节点返回信号的信号强度。
步骤S1032的详细过程可以参见实施例2中步骤S1031的相关介绍，在此不再赘述。
步骤S1033、主节点获取每个应答帧中调试帧对应的主节点调试信号的信号强度。
步骤S1034、基于应答帧对应的从节点返回信号的信号强度和应答帧中调试帧对应的主节点调试信号的信号强度，确定应答帧对应的信号强度。
步骤S1034可以包括但不局限于：
对应答帧对应的从节点返回信号的信号强度和应答帧中调试帧对应的主节点调试信号的信号强度进行平均运算，得到信号强度平均值，将信号强度平均值确定为应答帧对应的信号强度。
需要说明的是，在应答帧包含从节点的地址和调试帧对应的主节点调试信号的信号强度的情况下，电力线载波通信方法的具体实施方式并不局限于本实施例所提供的电力线载波通信方法，在应答帧包含从节点的地址和调试帧对应的主节点调试信号的信号强度的情况下，电力线载波通信方法的可实施方式均应保护在本申请中。
本实施例中，主节点通过确定每个所述调试帧对应的至少一个应答帧中每个应答帧对应的从节点返回信号的信号强度，主节点获取每个应答帧中调试帧对应的主节点调试信号的信号强度，基于应答帧对应的从节点返回信号的信号 强度和应答帧中调试帧对应的主节点调试信号的信号强度，确定应答帧对应的信号强度，可以保证应答帧对应的信号强度的可靠性，基于每个应答帧对应的可靠性更高的信号强度，从每个应答帧对应的从节点的地址中确定出满足设定信号强度条件的目标地址，可以提高目标地址的准确性，以获得电力线支路实际对应的汇流箱的地址，在此基础上，建立目标电力线支路和目标地址之间的拓扑关系，保证拓扑关系的准确性，在需要与从节点进行数据交互的情况下，可以基于准确的拓扑关系找到从节点实际对应的电力线支路，通过实际对应的电力线支路进行数据交互，保证数据交互的可靠性。
作为本申请另一可选实施例，参照图8，为本申请实施例4提供的一种电力线载波通信方法的流程示意图，本实施例主要是对上述实施例1中步骤S104的细化方案，如图8所示，步骤S104可以包括但不局限于以下步骤：
步骤S1041、若至少一个调试帧有一个，主节点对每个应答帧对应的信号强度进行比较，从每个应答帧中确定出信号强度最强的目标应答帧。
步骤S1042、主节点将目标应答帧中从节点的地址确定为目标地址。
在本实施例中，主节点基于目标电力线支路向至少一个从节点发送至少一个调试帧，接收至少一个调试帧中每个调试帧对应的至少一个应答帧，确定每个调试帧对应的至少一个应答帧中每个应答帧对应的信号强度，若至少一个调试帧有一个，主对每个应答帧对应的信号强度进行比较，从每个应答帧中确定出信号强度最强的目标应答帧，将目标应答帧中从节点的地址确定为目标地址，以获得目标电力线支路实际对应的从节点的地址，在此基础上，建立目标电力线支路和目标地址之间的拓扑关系，保证拓扑关系的准确性，在需要与从节点进行数据交互的情况下，可以基于准确的拓扑关系找到从节点实际对应的电力线支路，通过实际对应的电力线支路进行数据交互，保证数据交互的可靠性。
作为本申请另一可选实施例，参照图9，为本申请实施例5提供的一种电力线载波通信方法的流程示意图，本实施例主要是对上述实施例1中步骤S104的细化方案，如图9所示，步骤S104可以包括但不局限于以下步骤：
步骤S1043、若至少一个调试帧有多个，主节点基于每个应答帧对应的从 节点的地址，从每个应答帧中确定出每个从节点的地址对应的应答帧。
若至少一个调试帧有多个，对应多个调试帧，同一个从节点可能会返回多个应答帧，并且，同一个从节点返回的多个应答帧对应的从节点的地址均相同，即，每个从节点的地址可能会对应多个应答帧。本实施例中，可以比较每个应答帧对应的从节点的地址，将从节点的地址一致的各应答帧划分为一组，得到多组应答帧，将每组应答帧中应答帧作为相应从节点的地址对应的应答帧。
步骤S1044、主节点基于每个从节点的地址对应的应答帧对应的信号强度，确定每个从节点的地址对应的信号强度。
步骤S1044可以包括但不局限于：
主节点分别确定每个从节点的地址对应的应答帧对应的信号强度的平均值和/或方差值，将平均值和/或方差值确定为从节点的地址对应的信号强度。
步骤S1045、主节点对每个从节点的地址对应的信号强度进行比较，从每个从节点的地址中确定出信号强度最强的目标地址。
主节点对每个从节点的地址对应的信号强度进行比较，从每个从节点的地址中确定出信号强度最强的从节点的地址，将信号强度最强的从节点的地址确定为目标地址。
本实施例中，通过基于目标电力线支路发送多个调试帧，主节点基于每个应答帧对应的从节点的地址，从每个应答帧中确定出每个从节点的地址对应的应答帧，主节点基于每个从节点的地址对应的应答帧对应的信号强度，确定每个从节点的地址对应的信号强度，主节点对每个从节点的地址对应的信号强度进行比较，从每个从节点的地址中确定出信号强度最强的目标地址，可以提高目标地址的准确性。
作为本申请另一可选实施例，参照图10，为本申请实施例6提供的一种电力线载波通信方法的流程示意图，本实施例主要是对上述实施例1提供的电力线载波通信方法的扩展方案，如图10所示，可以包括但不局限于以下步骤：
步骤S201、主节点从多条电力线支路中依次选择一条作为目标电力线支路。
步骤S202、主节点基于目标电力线支路向至少一个从节点发送至少一个调试帧。
步骤S203、主节点接收至少一个调试帧中每个调试帧对应的至少一个应答帧，应答帧对应至少一个从节点中其中一个从节点，应答帧至少包含从节点的地址。
步骤S204、主节点确定每个调试帧对应的至少一个应答帧中每个应答帧对应的信号强度。
步骤S205、主节点基于每个应答帧对应的信号强度，从每个应答帧对应的从节点的地址中确定出满足设定信号强度条件的目标地址。
步骤S202-S205的详细过程可以参见实施例1中步骤S101-S104的相关介绍，在此不再赘述。
需要说明的是，在从多条电力线支路中每次选择一条作为目标电力线支路的情况下，均需要执行步骤S202-S205。
在针对每条目标电力线支路均执行了步骤S202-S205的情况下，可以确定出每条目标电力线支路对应的目标地址。
步骤S206、主节点在对每条目标电力线支路均确定出目标地址的情况下，确定出每条目标电力线支路对应的目标地址中存在重复的地址，对每条目标电力线支路对应的目标地址进行去重处理。
本实施例中，对每条目标电力线支路对应的目标地址进行去重处理，可以包括但不局限于：
按照从小到大的顺序对地址存在重复的各目标电力线支路的支路编号进行排列，得到支路编号排列结果，基于支路编号排列结果从可使用地址中选择地址作为存在重复的各目标电力线支路对应的目标地址。
其中，可使用地址与每条目标电力线支路对应的目标地址中除地址存在重复的各目标电力线支路对应的目标地址之外的目标电力线支路对应的目标地址不同。
步骤S207、主节点建立每条目标电力线支路和去重处理后的每条目标电力线支路对应的目标地址之间的拓扑关系。
在进行去重处理之后，建立拓扑关系，可以提高拓扑关系的准确性。
步骤S207为实施例1中步骤S105的一种具体实施方式。
需要说明的是，图10仅为示意电力线载波通信方法中所包含的各种步骤，其并作为对实际实施电力线载波通信方法的限制，图10中步骤S202-S20适用于 每条目标电力线支路。
需要说明的是，步骤S201-S205和上述实施例1中步骤S105也可以为电力线载波通信方法其中一种实施方式，其同样保护在本申请内。
本实施例中，通过获得每条电力线支路对应的目标地址，确定出每条电力线支路对应的目标地址中存在重复的地址，对每条电力线支路对应的目标地址进行去重处理，可以避免各电力线支路的目标地址出现冲突。
作为本申请另一可选实施例，参照图11，为本申请实施例7提供的一种电力线载波通信方法的流程示意图，本实施例主要是对上述实施例1提供的电力线载波通信方法的扩展方案，如图11所示，可以包括但不局限于以下步骤：
步骤S301、主节点基于目标电力线支路向至少一个从节点发送至少一个调试帧。
步骤S302、主节点接收至少一个调试帧中每个调试帧对应的至少一个应答帧，应答帧对应至少一个从节点中其中一个从节点，应答帧至少包含从节点的地址。
步骤S303、主节点确定每个调试帧对应的至少一个应答帧中每个应答帧对应的信号强度。
步骤S304、主节点基于每个应答帧对应的信号强度，从每个应答帧对应的从节点的地址中确定出满足设定信号强度条件的目标地址。
步骤S305、主节点建立目标电力线支路和目标地址之间的拓扑关系。
步骤S301-S205的详细过程可以参见实施例1中步骤S101-S105的相关介绍，在此不再赘述。
步骤S306、主节点获得通信报文。
本实施例中，数据采集器可以下发一包通信报文，通信报文中包含目标从节点地址。
通信报文可以为但不局限于：Modbus标准的通信报文。
每个主节点均会接收到通信报文，但只有拓扑关系中目标地址与目标从节点地址一致的主节点才会处理响应该通信报文。例如，若主节点为集中式逆变器，从节点为汇流箱，集中式逆变器的每个逆变单元的PLC主节点均会接收到通信报文，但只有拓扑关系中目标地址与目标汇流箱地址一致的PLC主节 点才会处理响应该通信报文。
本实施例中，PLC主节点可以包括但不局限于：电源、PLC主控芯片、PA功放电路、电子开关电路和耦合通道，每个耦合通道可以由PLC主控芯片的GPIO引脚单独控制打开或关闭。
每个耦合通道分别对应一条电力线支路，耦合通道用于基于PLC主控芯片的数据帧(如，调试帧)调制得到数据帧对应的主节点调试信号，将主节点调试信号发送至电力线支路。
步骤S307、若通信报文中目标从节点地址与拓扑关系中目标地址一致，主节点将通信报文发送给拓扑关系中目标电力线支路，以使得目标从节点地址对应的从节点从目标电力线支路接收通信报文，响应通信报文，返回目标从节点地址对应的从节点对应的数据。
例如，如图12所示，若耦合通道1对应的电力线支路对应汇流箱2，耦合通道2对应的电力线支路对应汇流箱3，耦合通道3对应的电力线支路对应汇流箱1，耦合通道4对应的电力线支路对应汇流箱4，耦合通道5对应的电力线支路对应汇流箱5，若通信报文中目标汇流箱地址为汇流箱2的地址，PLC主控芯片通过GPIO引脚打开电子开关电路1，以打开耦合通道1，PLC主控芯片将数字信号的通信报文发送给耦合通道1，耦合通道1将通信报文调制成模拟载波信号，并由PA功放电路将模拟载波信号放大后得到的电平发射至磁环线圈，利用磁环线圈将通信报文耦合到汇流箱2对应的电力线支路上。
汇流箱2对应的PLC从节点通过磁环线圈耦合，接收到来自PLC主节点的模拟载波信号，将模拟载波信号还原成数字信号，即，通信报文，通过串口将通信报文发送给汇流箱2的主控芯片。
汇流箱2的主控芯片在确定出通信报文中目标汇流箱地址与汇流箱2的地址匹配的情况下，开始应答，生成应答报文，应答报文包含汇流箱对应的数据(如，光伏板的电压数据、电流数据等)。汇流箱2的主控芯片通过串口将应答报文发送给PLC从节点，PLC从节点再反向将应答报文发送给PLC主节点。
PLC主节点可以将应答报文上报给数据采集器，完成一轮数据采集。
本实施例中，通过建立的拓扑关系，可以准确地将通信报文发送给汇流箱，保证数据交互的可靠性。
作为本申请另一可选实施例，参照图13，为本申请实施例8提供的一种电力线载波通信方法的流程示意图，本实施例主要是对上述实施例1提供的电力线载波通信方法的扩展方案，如图13所示，可以包括但不局限于以下步骤：
步骤S401、主节点从多条电力线支路中依次选择一条作为目标电力线支路。
步骤S402、主节点基于目标电力线支路向至少一个从节点发送至少一个调试帧
步骤S403、主节点接收至少一个调试帧中每个调试帧对应的至少一个应答帧，应答帧对应至少一个从节点中其中一个从节点，应答帧至少包含从节点的地址。
步骤S404、主节点确定每个调试帧对应的至少一个应答帧中每个应答帧对应的信号强度。
步骤S405、主节点基于每个应答帧对应的信号强度，从每个应答帧对应的从节点的地址中确定出满足设定信号强度条件的目标地址。
步骤S402-S405的详细过程可以参见实施例1中步骤S101-S104的相关介绍，在此不再赘述。
步骤S406、主节点建立目标电力线支路和目标地址之间的拓扑关系。
本步骤可以理解为：在对一条目标电力线支路确定出目标地址的情况下，主节点即建立目标电力线支路和目标地址之间的拓扑关系。
本步骤也可以理解为：主节点在对每条所述目标电力线支路均确定出目标地址的情况下，主节点建立每条目标电力线支路和目标电力线支路对应的目标地址之间的拓扑关系。
步骤S402-S406的详细过程可以参见实施例1中步骤S101-S105的相关介绍，在此不再赘述。
步骤S407、主节点存储每条目标电力线支路和目标电力线支路对应的目标地址之间的拓扑关系。
需要说明的是，图13仅用于示意电力线载波通信方法中所包含的各种步骤，其并作为对实际实施电力线载波通信方法的限制，图13中步骤S402-S405适用于每条目标电力线支路。
本实施例中，通过存储每条目标电力线支路和目标电力线支路对应的目标地址之间的拓扑关系，可以在需要时基于存储的拓扑关系进行数据交互即可，提高数据交互的效率。
作为本申请另一可选实施例，参照图14，为本申请实施例9提供的一种电力线载波通信方法的流程示意图，本实施例主要是对上述实施例1提供的电力线载波通信方法的扩展方案，如图14所示，可以包括但不局限于以下步骤：
步骤S501、主节点基于目标电力线支路向至少一个从节点发送至少一个调试帧。
步骤S502、主节点接收至少一个调试帧中每个调试帧对应的至少一个应答帧，应答帧对应至少一个从节点中其中一个从节点，应答帧至少包含从节点的地址。
步骤S503、主节点确定每个调试帧对应的至少一个应答帧中每个应答帧对应的信号强度。
步骤S504、主节点基于每个应答帧对应的信号强度，从每个应答帧对应的从节点的地址中确定出满足设定信号强度条件的目标地址。
步骤S505、主节点建立目标电力线支路和目标地址之间的拓扑关系。
步骤S501-S505的详细过程可以参见实施例1中步骤S101-S105的相关介绍，在此不再赘述。
步骤S506、主节点基于拓扑关系与目标电力线支路对应的从节点进行数据交互。
本实施例中，主节点可以基于拓扑关系找到主节点和从节点之间的实际电力线支路(即，目标电力线支路)，通过实际电力线支路进行数据交互，保证数据交互的可靠性。
接下来对本申请提供的一种电力线载波通信装置进行介绍，下文介绍的电力线载波通信装置与上文介绍的电力线载波通信方法可相互对应参照。
请参见图15，电力线载波通信装置包括：发送模块100、接收模块200、第一确定模块300、第二确定模块400和建立模块500。
发送模块100，用于基于目标电力线支路向至少一个从节点发送至少一个 调试帧。
接收模块200，用于接收至少一个调试帧中每个调试帧对应的至少一个应答帧，应答帧对应至少一个从节点中其中一个从节点，应答帧至少包含从节点的地址。
第一确定模块300，用于确定每个调试帧对应的至少一个应答帧中每个应答帧对应的信号强度。
第二确定模块400，用于基于每个应答帧对应的信号强度，从每个应答帧对应的从节点的地址中确定出满足设定信号强度条件的目标地址。
建立模块500，用于建立目标电力线支路和目标地址之间的拓扑关系。
本实施例中，电力线载波通信装置还可以包括：
数据交互模块，用于基于拓扑关系与目标电力线支路对应的从节点进行数据交互。
发送模块100，具体可以用于：
从多条电力线支路中依次选择一条作为目标电力线支路，基于目标电力线支路向至少一个从节点发送至少一个调试帧。
第一确定模块300，具体可以用于：
确定每个调试帧对应的至少一个应答帧中每个应答帧对应的从节点应答信号的信号强度。
应答帧还包含调试帧对应的主节点调试信号的信号强度，相应地，第一确定模块300，具体可以用于：
确定每个调试帧对应的至少一个应答帧中每个应答帧对应的从节点返回信号的信号强度；
获取每个应答帧中调试帧对应的主节点调试信号的信号强度；
基于应答帧对应的从节点返回信号的信号强度和应答帧中所述调试帧对应的主节点调试信号的信号强度，确定应答帧对应的信号强度。
本实施例中，若至少一个调试帧有一个，第二确定模块400，具体可以用于：
对每个应答帧对应的信号强度进行比较，从每个应答帧中确定出信号强度最强的目标应答帧；
将目标应答帧中从节点的地址确定为目标地址。
本实施例中，若至少一个调试帧有多个，第二确定模块400，具体可以用于：
基于每个应答帧对应的从节点的地址，从每个应答帧中确定出每个从节点的地址对应的应答帧；
基于每个从节点的地址对应的应答帧对应的信号强度，确定每个从节点的地址对应的信号强度；
对每个从节点的地址对应的信号强度进行比较，从每个从节点的地址中确定出信号强度最强的目标地址。
第二确定模块400基于每个从节点的地址对应的应答帧对应的信号强度，确定每个从节点的地址对应的信号强度的过程，具体可以包括：
分别确定每个从节点的地址对应的应答帧对应的信号强度的平均值和/或方差值，将平均值和/或方差值确定为从节点的地址对应的信号强度。
电力线载波通信装置还可以包括：
第一获得模块，用于获得每条电力线支路对应的目标地址；
去重模块，用于确定出每条电力线支路对应的目标地址中存在重复的地址，对每条电力线支路对应的目标地址进行去重处理。
本实施例中，电力线载波通信装置还可以包括：
第二获得模块，用于获得通信报文；
报文发送模块，用于若通信报文中目标从节点地址与拓扑关系中所述目标地址一致，将通信报文发送给拓扑关系中目标电力线支路，以使得目标从节点地址对应的从节点从目标电力线支路接收所述通信报文，响应通信报文，返回目标从节点地址对应的从节点对应的数据。
本实施例中，电力线载波通信装置还可以包括：
存储模块，用于存储目标电力线支路和目标地址之间的拓扑关系。
接下来对本申请提供的一种光伏系统进行介绍，下文介绍的光伏系统与上文介绍的电力线载波通信方法可相互对应参照。
光伏系统，包括：至少一个主节点和至少一个从节点，主节点可以包括逆变器，从节点可以包括汇流箱或优化器。
其中，对应汇流箱，逆变器可以为集中式逆变器；对应优化器，逆变器可 以为组串式逆变器。
逆变器，用于：
基于目标电力线支路向逆变器对应的汇流箱或优化器发送至少一个调试帧；
接收至少一个调试帧中每个调试帧对应的至少一个应答帧，应答帧对应逆变器对应的其中一个汇流箱或优化器，应答帧至少包含汇流箱或优化器的地址；
确定每个调试帧对应的至少一个应答帧中每个应答帧对应的信号强度；
基于每个应答帧对应的信号强度，从每个应答帧对应的汇流箱或优化器的地址中确定出满足设定信号强度条件的目标地址；
建立目标电力线支路和目标地址之间的拓扑关系；
汇流箱或所述优化器，用于响应调试帧，向逆变器返回应答帧。
需要说明的是，每个实施例重点说明的都是与其他实施例的不同之处，各个实施例之间相同相似的部分互相参见即可。对于装置类实施例而言，由于其与方法实施例基本相似，所以描述的比较简单，相关之处参见方法实施例的部分说明即可。
最后，还需要说明的是，在本文中，诸如第一和第二等之类的关系术语仅仅用来将一个实体或者操作与另一个实体或操作区分开来，而不一定要求或者暗示这些实体或操作之间存在任何这种实际的关系或者顺序。而且，术语“包括”、“包含”或者其任何其他变体意在涵盖非排他性的包含，从而使得包括一系列要素的过程、方法、物品或者设备不仅包括那些要素，而且还包括没有明确列出的其他要素，或者是还包括为这种过程、方法、物品或者设备所固有的要素。在没有更多限制的情况下，由语句“包括一个……”限定的要素，并不排除在包括所述要素的过程、方法、物品或者设备中还存在另外的相同要素。
为了描述的方便，描述以上装置时以功能分为各种模块分别描述。当然，在实施本申请时可以把各模块的功能在同一个或多个软件和/或硬件中实现。
通过以上的实施方式的描述可知，本领域的技术人员可以清楚地了解到本申请可借助软件加必需的通用硬件平台的方式来实现。基于这样的理解，本申请的技术方案本质上或者说对现有技术做出贡献的部分可以以软 件产品的形式体现出来，该计算机软件产品可以存储在存储介质中，如ROM/RAM、磁碟、光盘等，包括若干指令用以使得一台计算机设备(可以是个人计算机，服务器，或者网络设备等)执行本申请各个实施例或者实施例的某些部分所述的方法。
以上对本申请所提供的一种电力线载波通信方法、装置及光伏系统进行了详细介绍，本文中应用了具体个例对本申请的原理及实施方式进行了阐述，以上实施例的说明只是用于帮助理解本申请的方法及其核心思想；同时，对于本领域的一般技术人员，依据本申请的思想，在具体实施方式及应用范围上均会有改变之处，综上所述，本说明书内容不应理解为对本申请的限制。

Claims (14)

  1. 一种电力线载波通信方法，其特征在于，应用于光伏系统，所述光伏系统包括：至少一个主节点和至少一个从节点，该方法包括：
    所述主节点基于目标电力线支路向所述至少一个从节点发送至少一个调试帧；
    所述主节点接收所述至少一个调试帧中每个所述调试帧对应的至少一个应答帧，所述应答帧对应所述至少一个从节点中其中一个从节点，所述应答帧至少包含所述从节点的地址；
    所述主节点确定每个所述调试帧对应的至少一个应答帧中每个所述应答帧对应的信号强度；
    所述主节点基于每个所述应答帧对应的信号强度，从每个所述应答帧对应的从节点的地址中确定出满足设定信号强度条件的目标地址；
    所述主节点建立所述目标电力线支路和所述目标地址之间的拓扑关系。
  2. 根据权利要求1所述的方法，其特征在于，所述方法还包括：
    所述主节点基于所述拓扑关系与所述目标电力线支路对应的从节点进行数据交互。
  3. 根据权利要求1所述的方法，其特征在于，所述主节点基于目标电力线支路向所述至少一个从节点发送至少一个调试帧之前，还包括：
    所述主节点从多条电力线支路中依次选择一条作为目标电力线支路。
  4. 根据权利要求1所述的方法，其特征在于，所述主节点确定每个所述调试帧对应的至少一个应答帧中每个所述应答帧对应的信号强度，包括：
    所述主节点确定每个所述调试帧对应的至少一个应答帧中每个所述应答帧对应的从节点应答信号的信号强度。
  5. 根据权利要求1所述的方法，其特征在于，所述应答帧还包含所述调试帧对应的主节点调试信号的信号强度。
  6. 根据权利要求5所述的方法，其特征在于，所述主节点确定每个所述调试帧对应的至少一个应答帧中每个所述应答帧对应的信号强度，包括：
    所述主节点确定每个所述调试帧对应的至少一个应答帧中每个所述应答帧对应的从节点返回信号的信号强度；
    所述主节点获取每个所述应答帧中所述调试帧对应的主节点调试信号的 信号强度；
    所述主节点基于所述应答帧对应的从节点返回信号的信号强度和所述应答帧中所述调试帧对应的主节点调试信号的信号强度，确定所述应答帧对应的信号强度。
  7. 根据权利要求1所述的方法，其特征在于，若所述至少一个调试帧有一个，所述主节点基于每个所述应答帧对应的信号强度，从每个所述应答帧对应的从节点的地址中确定出满足设定信号强度条件的目标地址，包括：
    所述主节点对每个所述应答帧对应的信号强度进行比较，从每个所述应答帧中确定出信号强度最强的目标应答帧；
    所述主节点将所述目标应答帧中从节点的地址确定为目标地址。
  8. 根据权利要求1所述的方法，其特征在于，若所述至少一个调试帧有多个，所述主节点基于每个所述应答帧对应的信号强度，从每个所述应答帧对应的从节点的地址中确定出满足设定信号强度条件的目标地址，包括：
    所述主节点基于每个所述应答帧对应的从节点的地址，从每个所述应答帧中确定出每个从节点的地址对应的应答帧；
    所述主节点基于每个所述从节点的地址对应的应答帧对应的信号强度，确定每个所述从节点的地址对应的信号强度；
    所述主节点对每个所述从节点的地址对应的信号强度进行比较，从每个所述从节点的地址中确定出信号强度最强的目标地址。
  9. 根据权利要求8所述的方法，其特征在于，所述主节点基于每个所述从节点的地址对应的应答帧对应的信号强度，确定每个所述从节点的地址对应的信号强度，包括：
    所述主节点分别确定每个所述从节点的地址对应的应答帧对应的信号强度的平均值和/或方差值，将所述平均值和/或方差值确定为所述从节点的地址对应的信号强度。
  10. 根据权利要求3所述的方法，其特征在于，所述主节点基于每个所述应答帧对应的信号强度，从每个所述应答帧对应的从节点的地址中确定出满足设定信号强度条件的目标地址之后，还包括：
    所述主节点在对每条所述目标电力线支路均确定出目标地址的情况下，确定出每条所述目标电力线支路对应的目标地址中存在重复的地址，对每条所述 目标电力线支路对应的目标地址进行去重处理；
    所述主节点建立所述目标电力线支路和所述目标地址之间的拓扑关系，包括：
    所述主节点建立每条所述目标电力线支路和去重处理后的每条所述目标电力线支路对应的目标地址之间的拓扑关系。
  11. 根据权利要求1所述的方法，其特征在于，所述主节点建立所述目标电力线支路和所述目标地址之间的拓扑关系之后，还包括：
    所述主节点获得通信报文；
    若所述通信报文中目标从节点地址与所述拓扑关系中所述目标地址一致，所述主节点将所述通信报文发送给所述拓扑关系中所述目标电力线支路，以使得所述目标从节点地址对应的从节点从所述目标电力线支路接收所述通信报文，响应所述通信报文，返回所述目标从节点地址对应的从节点对应的数据。
  12. 根据权利要求3所述的方法，其特征在于，所述主节点建立所述目标电力线支路和所述目标地址之间的拓扑关系之后，包括：
    所述主节点存储每条所述目标电力线支路和所述目标电力线支路对应的目标地址之间的拓扑关系。
  13. 一种电力线载波通信装置，其特征在于，包括：
    发送模块，用于基于目标电力线支路向所述至少一个从节点发送至少一个调试帧；
    接收模块，用于接收所述至少一个调试帧中每个所述调试帧对应的至少一个应答帧，所述应答帧对应所述至少一个从节点中其中一个从节点，所述应答帧至少包含所述从节点的地址；
    第一确定模块，用于确定每个所述调试帧对应的至少一个应答帧中每个所述应答帧对应的信号强度；
    第二确定模块，用于基于每个所述应答帧对应的信号强度，从每个所述应答帧对应的从节点的地址中确定出满足设定信号强度条件的目标地址；
    建立模块，用于建立所述目标电力线支路和所述目标地址之间的拓扑关系。
  14. 一种光伏系统，其特征在于，包括：至少一个主节点和至少一个从节点，所述主节点包括逆变器，所述从节点包括汇流箱或优化器；
    所述逆变器，用于：
    基于目标电力线支路向所述逆变器对应的汇流箱或优化器发送至少一个调试帧；
    接收所述至少一个调试帧中每个所述调试帧对应的至少一个应答帧，所述应答帧对应所述逆变器对应的其中一个汇流箱或优化器，所述应答帧至少包含所述汇流箱或优化器的地址；
    确定每个所述调试帧对应的至少一个应答帧中每个所述应答帧对应的信号强度；
    基于每个所述应答帧对应的信号强度，从每个所述应答帧对应的汇流箱或优化器的地址中确定出满足设定信号强度条件的目标地址；
    建立所述目标电力线支路和所述目标地址之间的拓扑关系；
    所述汇流箱或所述优化器，用于响应所述调试帧，向所述逆变器返回应答帧。
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