A low-voltage power distribution network topology identification system based on current fingerprints

Abstract

The application provides a low-voltage power distribution network topology identification system based on current fingerprints, which comprises a district node modem and an intermediate node modem; the intermediate node modem generates a corresponding intermediate node characteristic code according to an intermediate node number and a check code, and couples the intermediate node characteristic code to a power line to which the intermediate node belongs; the district node modem collects the intermediate node characteristic code, and generates a corresponding intermediate node confirmation code according to a district node number and the intermediate node characteristic code, and broadcasts the intermediate node confirmation code; the intermediate node modem receives the intermediate node confirmation code, matches the intermediate node characteristic code and the intermediate node confirmation code, and the district node modem forms a first district topology network structure according to intermediate node number information. The low-voltage power distribution network topology is realized through the broadcast technology combined with the current fingerprint identification technology, and the problem of low efficiency caused by manual inspection and identification is avoided.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of low-voltage power distribution network, and particularly relates to a low-voltage power distribution network topology identification system based on current fingerprints. BACKGROUND

[0002] The low-voltage power distribution network is a terminal network directly facing users for power supply, and is an important component of the power grid. In recent years, with the advancement of smart grid construction, the construction and application of low-voltage power distribution area node intelligent terminal monitoring and power information collection systems have created favorable conditions for the intelligentization and informatization management of low-voltage power grids, and greatly improved the power supply reliability and safety.

[0003] At present, the establishment of the topology relationship of the low-voltage power distribution area node mainly relies on the topology data left during the construction period, and the real-time updating performance is poor. If the line changes in the later period, it is difficult to achieve real-time updating, leading to inconsistency between the actual power distribution network topology on site and the display of the main station, so that the fault point cannot be quickly located once a fault occurs in the later period, and the problem cannot be timely investigated. A large amount of manpower and material resources need to be invested to investigate the topology relationship in the later period, and manual maintenance is required. In addition, due to the large number of low-voltage power distribution network electrical equipment and the complex electrical wiring, there is also the phenomenon of private connection, so it is low in efficiency and sometimes errors occur to rely on manual inspection according to the distribution and wiring of the low-voltage area node power distribution network. SUMMARY

[0004] The present application provides a low-voltage power distribution network topology identification system based on current fingerprints to solve the low efficiency and other defects of the prior art.

[0005] The present application provides a low-voltage power distribution network topology identification system based on current fingerprints, which comprises at least one area node, and a plurality of intermediate nodes under each area node, and at least comprises an area node modem corresponding to the area node and an intermediate node modem corresponding to each intermediate node.

[0006] The intermediate node modem generates a corresponding intermediate node characteristic code according to the preset intermediate node number and the check code of the corresponding intermediate node, and couples the intermediate node characteristic code to the power line to which the intermediate node belongs.

[0007] The area node modem collects the intermediate node characteristic code, and generates a corresponding intermediate node confirmation code according to the preset area node number of the corresponding area node and the intermediate node characteristic code, and broadcasts the intermediate node confirmation code.

[0008] The intermediate node modem receives the intermediate node confirmation code, matches the intermediate node feature code and the intermediate node confirmation code, and sends intermediate node number information to the district node modem after the matching is passed.

[0009] The district node modem forms a first district topology network structure according to the intermediate node number information.

[0010] Optionally, each intermediate node in the low-voltage power distribution network includes a plurality of meter end nodes, and the system further includes a meter end node modem corresponding to each meter end node;

[0011] The meter end node modem generates a corresponding meter end node feature code according to the preset meter end node number and the check code of the corresponding meter end node, and couples the meter end node feature code to the power line to which the meter end node belongs;

[0012] The intermediate node modem collects the meter end node feature code, and generates a corresponding meter end node confirmation code according to the preset intermediate node number of the corresponding intermediate node and the meter end node feature code, uploads the meter end node confirmation code to the district node modem, and broadcasts the meter end node confirmation code by the district node modem;

[0013] The meter end node modem receives the meter end node confirmation code, matches the meter end node feature code and the meter end node confirmation code, and sends meter end node number information to the district node modem after the matching is passed.

[0014] The district node modem forms a second district topology network structure according to the intermediate node number information and the meter end node number information.

[0015] Optionally, the intermediate node modem is specifically used for:

[0016] The intermediate node number and the check code are used for binary encoding to generate a corresponding intermediate node feature code.

[0017] Optionally, the meter end node modem is specifically used for:

[0018] The meter end node number and the check code are used for binary encoding to generate a corresponding meter end node feature code.

[0019] Optionally, the intermediate node modem and the meter end node modem respectively generate random numbers, and select the frequency point of current modulation according to the preset frequency point allocation rule and the corresponding random number, wherein the frequency point is a multiple of 50hz.

[0020] Optionally, the intermediate node modem sends the intermediate node current signal coupled with the intermediate node characteristic code to the base station node modem based on the frequency point;

[0021] The table end node modem sends the table end node current signal coupled with the table end node characteristic code to the intermediate node modem based on the frequency point.

[0022] Optionally, the base station node modem is specifically used for:

[0023] receiving the intermediate node current signal sent by the intermediate node modem;

[0024] performing Fourier analysis on the intermediate node current signal to extract the intermediate node characteristic code and the frequency point of the intermediate node modem in the intermediate node current signal;

[0025] performing binary coding using the base station node number, the intermediate node characteristic code and the frequency point to generate a corresponding intermediate node confirmation code, and broadcasting the intermediate node confirmation code.

[0026] Optionally, the intermediate node modem is specifically used for:

[0027] receiving the table end node current signal sent by the table end node modem;

[0028] performing Fourier analysis on the table end node current signal to extract the table end node characteristic code and the frequency point of the table end node modem in the table end node current signal;

[0029] performing binary coding using the intermediate node number, the table end node characteristic code and the frequency point to generate a corresponding table end node confirmation code, and uploading the table end node confirmation code to the base station node modem, which broadcasts the table end node confirmation code.

[0030] Optionally, the intermediate node modem is specifically used for:

[0031] According to the received intermediate node confirmation code and the intermediate node characteristic code, it is judged whether the intermediate node number corresponding to the intermediate node confirmation code matches the intermediate node number corresponding to the intermediate node characteristic code, and whether the frequency point corresponding to the intermediate node confirmation code matches the frequency point of the current modulation selected by the intermediate node modem;

[0032] If the intermediate node number corresponding to the intermediate node confirmation code matches the intermediate node number corresponding to the intermediate node feature code, and the frequency point corresponding to the intermediate node confirmation code matches the frequency point of the selected current modulation, a target intermediate node modem is determined according to the intermediate node number corresponding to the intermediate node confirmation code, and intermediate node number information is sent to the target intermediate node modem.

[0033] Optionally, the table end node modem is specifically configured to:

[0034] According to the received table end node confirmation code and the table end node feature code, it is judged whether the table end node number corresponding to the table end node confirmation code matches the table end node number corresponding to the table end node feature code, and whether the frequency point corresponding to the table end node confirmation code matches the frequency point of the selected current modulation.

[0035] If the table end node number corresponding to the table end node confirmation code matches the table end node number corresponding to the table end node feature code, and the frequency point corresponding to the table end node confirmation code matches the frequency point of the selected current modulation, a target intermediate node modem is determined according to the intermediate node number corresponding to the table end node confirmation code, and table end node number information is sent to the corresponding intermediate node modem.

[0036] The technical scheme provided in the present application has the following advantages:

[0037] The current fingerprint-based low-voltage power distribution network topology identification system provided in the present application comprises a table area node modem corresponding to a table area node and an intermediate node modem corresponding to each intermediate node; the intermediate node modem generates a corresponding intermediate node feature code according to the preset intermediate node number and the check code of the corresponding intermediate node, and couples the intermediate node feature code to the power line to which the intermediate node belongs; the table area node modem collects the intermediate node feature code, and generates a corresponding intermediate node confirmation code according to the preset table area node number and the intermediate node feature code of the corresponding table area node, and broadcasts the intermediate node confirmation code; the intermediate node modem receives the intermediate node confirmation code, matches the intermediate node feature code and the intermediate node confirmation code, and sends the intermediate node number information to the table area node modem after the matching is passed; and the table area node modem forms a first table area topology network structure according to the intermediate node number information. The system provided in the above scheme realizes the low-voltage power distribution network topology through the broadcast technology combined with the current fingerprint identification technology, and avoids the problem of low efficiency caused by manual inspection and identification. BRIEF DESCRIPTION OF DRAWINGS

[0038] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can also be obtained by those skilled in the art based on these drawings.

[0039] Figure 1 A structural schematic diagram of a low-voltage power distribution network topology identification system based on current fingerprint provided by an embodiment of the present application;

[0040] Figure 2 A structural schematic diagram of another low-voltage power distribution network topology identification system based on current fingerprint provided by an embodiment of the present application;

[0041] Figure 3 An exemplary flowchart of a low-voltage power distribution network topology identification method based on current fingerprint provided by an embodiment of the present application.

[0042] Through the above drawings, the specific embodiments of the present application have been shown, and more detailed descriptions will be given in the following. These drawings and textual descriptions are not intended to limit the scope of the present disclosure concept by any means, but to illustrate the concept of the present application to those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0043] In order to make the purposes, technical solutions and advantages of the embodiments of the present application more clear, the technical solutions in the embodiments of the present application will be described clearly and completely in the following by combining the drawings in the embodiments of the present application. Obviously, the described embodiments are some of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without any creative work fall within the scope of protection of the present application.

[0044] In addition, the terms "first", "second", etc. are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. In the description of the following embodiments, the meaning of "a plurality of" is more than two, unless otherwise specifically limited.

[0045] At present, the establishment of the node topology relationship of the low-voltage distribution area mainly relies on the topology data left during the construction period, and the real-time updating performance is poor. If the line changes in the later period, it is difficult to update in real time, which leads to the inconsistency between the actual distribution network topology on site and the display of the main station, so that the fault point cannot be quickly located once a fault occurs in the later period, and the problem cannot be timely investigated. A large amount of manpower and material resources need to be invested to investigate the topology relationship in the later period, and manual maintenance is required. Moreover, due to the large number of low-voltage distribution network power equipment and the complex electrical wiring, there is also the phenomenon of private connection, so it is low in efficiency and sometimes errors occur to rely on manual inspection according to the distribution and wiring of the low-voltage distribution area node distribution network.

[0046] To solve the above problems, the low-voltage distribution network topology identification system based on current fingerprints provided by the embodiments of the present application includes a distribution area node modem corresponding to a distribution area node and an intermediate node modem corresponding to each intermediate node. The intermediate node modem generates a corresponding intermediate node feature code according to the preset intermediate node number and the check code of the corresponding intermediate node, and couples the intermediate node feature code to the power line to which the intermediate node belongs. The distribution area node modem samples the intermediate node feature code, and generates a corresponding intermediate node confirmation code according to the preset distribution area node number and the intermediate node feature code of the corresponding distribution area node, and broadcasts the intermediate node confirmation code. The intermediate node modem receives the intermediate node confirmation code, matches the intermediate node feature code and the intermediate node confirmation code, and sends the intermediate node number information to the distribution area node modem after the matching is passed. The distribution area node modem forms a first distribution area topology network structure according to the intermediate node number information. The system provided by the above scheme realizes the low-voltage distribution network topology through the broadcast technology combined with the current fingerprint identification technology, and avoids the problem of low efficiency caused by manual inspection and identification.

[0047] The following specific embodiments can be combined with each other, and the same or similar concepts or processes can not be described again in some embodiments. The embodiments of the present application will be described below with reference to the accompanying drawings.

[0048] The embodiments of the present application provide a low-voltage distribution network topology identification system based on current fingerprints, which is used to identify the topology network structure of the low-voltage distribution network. The low-voltage distribution network includes at least one distribution area node, and each distribution area node includes a plurality of intermediate nodes.

[0049] As shown in Figure 1 Fig. 1 is a structure schematic diagram of a low-voltage distribution network topology identification system based on current fingerprints provided by the embodiments of the present application, which includes at least a distribution area node modem corresponding to a distribution area node and an intermediate node modem corresponding to each intermediate node.

[0050] The intermediate node modem generates a corresponding intermediate node characteristic code according to the preset intermediate node number and the check code of the corresponding intermediate node, and couples the intermediate node characteristic code to the power line to which the intermediate node belongs; the transformer node modem collects the intermediate node characteristic code, and generates a corresponding intermediate node confirmation code according to the preset transformer node number and the intermediate node characteristic code of the corresponding transformer node, and broadcasts the intermediate node confirmation code; the intermediate node modem receives the intermediate node confirmation code, and matches the intermediate node characteristic code and the intermediate node confirmation code, and sends the intermediate node number information to the transformer node modem after the matching is passed; and the transformer node modem forms a first transformer topology network structure according to the intermediate node number information.

[0051] For example, in order to obtain the intermediate node number information, the transformer node modem broadcasts an intermediate node reporting command to the intermediate node modem; after receiving the intermediate node reporting command broadcast by the transformer node, the intermediate node modem generates an intermediate node characteristic code.

[0052] Further, in an embodiment, a plurality of meter end nodes are included under each intermediate node in the low-voltage power distribution network, such as Figure 2 As shown in the figure, another structure of a low-voltage power distribution network topology identification system based on current fingerprints provided by the embodiment of the application also includes a meter end node modem corresponding to each meter end node.

[0053] The meter end node modem generates a corresponding meter end node characteristic code according to the preset meter end node number and the check code of the corresponding meter end node, and couples the meter end node characteristic code to the power line to which the meter end node belongs; the intermediate node modem collects the meter end node characteristic code, and generates a corresponding meter end node confirmation code according to the preset intermediate node number and the meter end node characteristic code of the corresponding intermediate node, and uploads the meter end node confirmation code to the transformer node modem; the transformer node modem broadcasts the meter end node confirmation code; the meter end node modem receives the meter end node confirmation code, and matches the meter end node characteristic code and the meter end node confirmation code, and sends the meter end node number information to the transformer node modem after the matching is passed; and the transformer node modem forms a second transformer topology network structure according to the intermediate node number information and the meter end node number information.

[0054] It should be explained that the intermediate node characteristic code, the intermediate node confirmation code, the meter end node characteristic code, and the meter end node confirmation code are current fingerprints provided by the embodiment of the application.

[0055] Exemplarily, in order to obtain the meter-end node number information, the intermediate node modem broadcasts a meter-end node reporting command to the meter-end node modem; after receiving the intermediate node broadcasted meter-end node reporting command, the meter-end node modem generates a meter-end node characteristic code.

[0056] In the embodiment, the intermediate node reporting command and / or the meter-end node reporting command are broadcasted through a broadband power line carrier (HPLC), and the intermediate node confirmation code and / or the meter-end node confirmation code are broadcasted through the broadband power line carrier. Specifically, the intermediate node modem can broadcast the intermediate node reporting command and / or the meter-end node reporting command through the HPLC. In addition, the intermediate node modem can also broadcast the intermediate node confirmation code and / or the meter-end node confirmation code through the HPLC.

[0057] Specifically, in an embodiment, the intermediate node modem can use the intermediate node number and the check code to perform binary encoding to generate a corresponding intermediate node characteristic code.

[0058] Correspondingly, the meter-end node modem can use the meter-end node number and the check code to perform binary encoding to generate a corresponding meter-end node characteristic code.

[0059] It should be explained that the intermediate node number and / or the meter-end node number are calibrated when the intermediate node and / or the meter-end node are set, and each intermediate node number and / or meter-end node number is unique. The check code is mainly used to prove that the current signal generated by the intermediate node and / or the meter-end node is safe and complete. The intermediate node number and / or the meter-end node number and the above-mentioned check code can be a decimal integer, and the two are binary encoded to generate an intermediate node characteristic code and / or a meter-end node characteristic code.

[0060] Exemplarily, if the intermediate node characteristic code and / or the meter-end node characteristic code is set to 8-bit binary encoding, the first 4-bit binary encoding can correspond to the intermediate node number and / or the meter-end node number, and the last 4-bit binary encoding can correspond to the check code of the intermediate node and / or the check code of the meter-end node.

[0061] Specifically, in an embodiment, in order to reduce the frequency point repetition rate between each node and lay a foundation for improving the accuracy of subsequent matching work, the intermediate node modem and the meter-end node modem respectively generate random numbers, and respectively select the frequency point of current modulation according to the preset frequency point allocation rule and the corresponding random number, wherein the frequency point is a multiple of 50hz.

[0062] The frequency point allocation rule can be set according to actual conditions, for example, the frequency point can be 50hz*mod(random number, random number period).

[0063] For example, if the generated random number is a 4, 8, 12 or 16-bit binary code, the binary code of the current random number is 0101, the corresponding decimal integer is 5, the random number period is 4, and the frequency point is 50hz*mod(5, 4) = 50hz.

[0064] Further, in an embodiment, the intermediate node modem sends the intermediate node current signal coupled with the intermediate node characteristic code to the table area node modem based on the frequency point; and the table end node modem sends the table end node current signal coupled with the table end node characteristic code to the intermediate node modem based on the frequency point.

[0065] Further, in an embodiment, the table area node modem receives the intermediate node current signal sent by the intermediate node modem; performs Fourier analysis on the intermediate node current signal to extract the intermediate node characteristic code and the frequency point of the intermediate node modem in the intermediate node current signal; and performs binary coding using the table area node number, the intermediate node characteristic code and the frequency point to generate a corresponding intermediate node confirmation code, and broadcasts the intermediate node confirmation code.

[0066] Correspondingly, in an embodiment, the intermediate node modem receives the table end node current signal sent by the table end node modem; performs Fourier analysis on the table end node current signal to extract the table end node characteristic code and the frequency point of the table end node modem in the table end node current signal; performs binary coding using the intermediate node number, the table end node characteristic code and the frequency point to generate a corresponding table end node confirmation code; and uploads the table end node confirmation code to the table area node modem, which broadcasts the table end node confirmation code.

[0067] Specifically, the table area node modem and / or the intermediate node modem uses Fourier analysis technology to extract the intermediate node characteristic code and the frequency point and / or the table end node characteristic code and the frequency point in the obtained intermediate node current signal and / or table area node current signal, and further combines the table area node number and / or the intermediate node number to generate the intermediate node confirmation code and / or the table end node confirmation code. The specific Fourier analysis process can refer to the prior art, and the embodiments of the present application are not limited.

[0068] Specifically, in an embodiment, the intermediate node modem determines whether the intermediate node number corresponding to the received intermediate node confirmation code matches the intermediate node number corresponding to the received intermediate node characteristic code, and determines whether the frequency point corresponding to the received intermediate node confirmation code matches the frequency point of the current modulation selected by the intermediate node modem; if the intermediate node number corresponding to the received intermediate node confirmation code matches the intermediate node number corresponding to the received intermediate node characteristic code, and the frequency point corresponding to the received intermediate node confirmation code matches the frequency point of the current modulation selected by the intermediate node modem, the intermediate node modem determines the target area node modem according to the area node number corresponding to the received intermediate node confirmation code, and sends the intermediate node number information to the target area node modem.

[0069] Correspondingly, in an embodiment, the table end node modem determines whether the table end node number corresponding to the received table end node confirmation code matches the table end node number corresponding to the received table end node characteristic code, and determines whether the frequency point corresponding to the received table end node confirmation code matches the frequency point of the current modulation selected by the table end node modem; if the table end node number corresponding to the received table end node confirmation code matches the table end node number corresponding to the received table end node characteristic code, and the frequency point corresponding to the received table end node confirmation code matches the frequency point of the current modulation selected by the table end node modem, the table end node modem determines the target intermediate node modem according to the intermediate node number corresponding to the received table end node confirmation code, and sends the table end node number information to the corresponding area node modem.

[0070] Specifically, if the intermediate node modem determines that both match, it is determined that the intermediate node corresponding to the intermediate node modem belongs to the area node (the area node corresponding to the area node number in the intermediate node confirmation code). If the table end node modem determines that both match, it is determined that the table end node corresponding to the table end node modem belongs to the intermediate node (the intermediate node corresponding to the intermediate node number in the table end node confirmation code).

[0071] For example, as shown in FIG. 1, the low-voltage power distribution network topology identification method provided by the embodiment of the present application includes the following steps: Figure 3 For example, as shown in FIG. 1, the low-voltage power distribution network topology identification method provided by the embodiment of the present application includes the following steps:

[0072] For example, the low-voltage power distribution network topology identification method provided by the embodiment of the present application includes the following steps:

[0073] Step S101: broadcast the intermediate node reporting command to the intermediate node.

[0074] In an embodiment, the substation node modem is set to master and receiving mode. When the topology needs to be formed, the substation node modem can broadcast the intermediate node reporting command by using HPLC.

[0075] Step S201: receive the intermediate node reporting command broadcast by the substation node.

[0076] In an embodiment, the intermediate node modem is set to slave and receiving-transmitting mode. When the substation node broadcasts the intermediate node reporting command, the intermediate node modem can receive the intermediate node reporting command.

[0077] Step S202: generate the intermediate node characteristic code according to the intermediate node reporting command, and couple the intermediate node characteristic code to the power line.

[0078] Step S102: collect the intermediate node characteristic code coupled to the power line by the intermediate node according to the intermediate node reporting command; specifically, after the substation node broadcasts the intermediate node reporting command, the signal on the power line can be monitored and collected.

[0079] Step S103: analyze the intermediate node characteristic code according to the Fourier analysis method to obtain the intermediate node confirmation code, and broadcast the intermediate node confirmation code.

[0080] In an embodiment, for the signal collected by the substation node, the Fourier analysis method can be used to analyze the frequency points contained therein, then the analyzed frequency points and the number of the substation node are encoded again to form a set of data with check code, as the intermediate node confirmation code, and the intermediate node confirmation code is broadcast by using HPLC.

[0081] Step S203: receive the intermediate node confirmation code broadcast by the substation node, which is obtained by analyzing the intermediate node characteristic code by the substation node using the Fourier analysis method.

[0082] Step S204: match the intermediate node confirmation code and the intermediate node characteristic code, and after the matching is passed, send the intermediate node number information to the substation node.

[0083] In an embodiment, after the intermediate node receives the intermediate node confirmation code broadcast by the substation node, the frequency points contained therein are matched with the frequency points contained in the intermediate specific characteristic code, if the matching is passed, it means that the intermediate node belongs to the corresponding substation node, then the number of the intermediate node and the number of the substation node to which it belongs are reported to the corresponding substation node.

[0084] Specifically, when the current modulation signal is transmitted in the power line, any position of the power line can demodulate the modulation signal, that is, two devices capable of modulating and demodulating the same signal must be in the same current loop to form the top and bottom nodes of the topology. Therefore, when the station area node modem processes the parsed feature code to obtain the confirmation code, and the intermediate node modem matches the confirmation code, it means that the intermediate node belongs to the station area node of the broadcast command, and the top and bottom nodes of the topology can be formed.

[0085] Step S104: receiving the intermediate node number information sent by the intermediate node after the intermediate node confirmation code and the intermediate node feature code are matched.

[0086] Step S105: broadcasting the table end node reporting command to the table end node.

[0087] Specifically, after the station area node receives the intermediate node number information, the table end node reporting command can be broadcasted to the table end node. For example, a modem can be set under the electric energy meter as a table end node modem, and the table end node modem is set as a slave and a sending mode.

[0088] Step S301: receiving the table end node reporting command broadcasted by the station area node.

[0089] Step S302: generating a table end node feature code according to the table end node reporting command, and coupling the table end node feature code to the power line.

[0090] Step S205: collecting the table end node feature code generated by the table end node according to the table end node reporting command; specifically, after the station area node broadcasts the table end node reporting command, the intermediate node can monitor the signal on the power line and collect.

[0091] Step S206: analyzing the table end node feature code according to the Fourier analysis method to obtain a table end node confirmation code, and sending the table end node confirmation code to the station area node.

[0092] In an embodiment, for the signal collected by the intermediate node, the Fourier analysis method can be used for analysis to obtain the frequency points contained therein, and then the analyzed frequency points and the number of the intermediate node are encoded again to form a group of data with check code as the table end node confirmation code, and the table end node confirmation code is reported to the station area node by HPLC.

[0093] Step S106: receiving the table end node confirmation code obtained by the intermediate node according to the Fourier analysis of the table end node feature code, and broadcasting the table end node confirmation code, wherein the table end node feature code is generated by the table end node according to the table end node reporting command.

[0094] Specifically, after receiving the table end node confirmation code sent by the intermediate node, the table area node can broadcast it to the table end node.

[0095] Step S303: receiving the table end node confirmation code broadcast by the table area node, the table end node confirmation code is sent to the table area node after the intermediate node Fourier analyzes the table end node characteristic code.

[0096] Step S304: matching the table end node confirmation code and the table end node characteristic code, and sending the table end node number information to the table area node after the matching is passed.

[0097] In an embodiment, after receiving the table end node confirmation code broadcast by the table area node, the table end node matches the frequency points contained in the table end node confirmation code with the frequency points contained in the table end node characteristic code. If the matching is passed, it means that the table end node belongs to the corresponding intermediate node, and then the number of the table end node and the number of the intermediate node to which it belongs are reported to the corresponding table area node.

[0098] Step S107: receiving the table end node number information sent by the table end node after matching the table end node confirmation code and the table end node characteristic code.

[0099] Step S108: forming a table area topology network structure according to the intermediate node number information and the table end node number information.

[0100] Specifically, after receiving the intermediate node number information and the table end node number information, the table area node can form a table area topology network structure through the ownership relationship among the three.

[0101] The low-voltage power distribution network topology identification system based on current fingerprint provided by the embodiment of the application comprises a table area node modem corresponding to a table area node and an intermediate node modem corresponding to each intermediate node; the intermediate node modem generates a corresponding intermediate node characteristic code according to the preset intermediate node number and the check code of the corresponding intermediate node, and couples the intermediate node characteristic code to the power line to which the intermediate node belongs; the table area node modem samples the intermediate node characteristic code, and generates a corresponding intermediate node confirmation code according to the preset table area node number of the corresponding table area node and the intermediate node characteristic code, and broadcasts the intermediate node confirmation code; the intermediate node modem receives the intermediate node confirmation code, matches the intermediate node characteristic code and the intermediate node confirmation code, and sends the intermediate node number information to the table area node modem after the matching is passed; and the table area node modem forms a first table area topology network structure according to the intermediate node number information. The system provided by the above scheme realizes the low-voltage power distribution network topology through the broadcast technology combined with the current fingerprint identification technology, and avoids the problem of low efficiency caused by manual inspection and identification.

[0102] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, but not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A current-fingerprint-based low-voltage power distribution network topology identification system, the low-voltage power distribution network comprising: At least one zone node, each zone node including a plurality of intermediate nodes, characterized in that the system comprises at least: a zone node modem corresponding to the zone node and an intermediate node modem corresponding to each intermediate node; The intermediate node modem generates a corresponding intermediate node characteristic code according to the preset intermediate node number and the check code of the corresponding intermediate node, and couples the intermediate node characteristic code to the power line to which the intermediate node belongs; The zone node modem collects the intermediate node characteristic code, and generates a corresponding intermediate node confirmation code according to the preset zone node number of the corresponding zone node and the intermediate node characteristic code, and broadcasts the intermediate node confirmation code; The intermediate node modem receives the intermediate node confirmation code, matches the intermediate node characteristic code and the intermediate node confirmation code, and sends the intermediate node number information to the zone node modem after the matching is passed; The zone node modem forms a first zone topology network structure according to the intermediate node number information.

2. The system of claim 1, wherein each intermediate node in the low voltage distribution grid includes a plurality of table end nodes thereunder, and wherein, The system further comprises a table end node modem corresponding to each table end node; The table end node modem generates a corresponding table end node characteristic code according to the preset table end node number and the check code of the corresponding table end node, and couples the table end node characteristic code to the power line to which the table end node belongs; The intermediate node modem collects the table end node characteristic code, and generates a corresponding table end node confirmation code according to the preset intermediate node number of the corresponding intermediate node and the table end node characteristic code, and uploads the table end node confirmation code to the zone node modem, which broadcasts the table end node confirmation code; The table end node modem receives the table end node confirmation code, matches the table end node characteristic code and the table end node confirmation code, and sends the table end node number information to the zone node modem after the matching is passed; The zone node modem forms a second zone topology network structure according to the intermediate node number information and the table end node number information.

3. The system of claim 1, wherein, The intermediate node modem is specifically used for: Generating a corresponding intermediate node characteristic code by binary encoding using the intermediate node number and the check code.

4. The system of claim 2, wherein, The table end node modem is specifically used for: Generating a corresponding table end node characteristic code by binary encoding using the table end node number and the check code.

5. The system of claim 2, wherein, The intermediate node modem and the table end node modem respectively generate random numbers, and select the frequency of current modulation according to the preset frequency allocation rule and the corresponding random number, wherein the frequency is a multiple of 50hz.

6. The system of claim 5, wherein, The intermediate node modem sends an intermediate node current signal coupled with the intermediate node characteristic code to the zone node modem based on the frequency; The table end node modem sends a table end node current signal coupled with the table end node characteristic code to the intermediate node modem based on the frequency.

7. The system of claim 6, wherein, The substation node modem is specifically used for: receiving the intermediate node current signal sent by the intermediate node modem; performing Fourier analysis on the intermediate node current signal to extract the intermediate node characteristic code and frequency point of the intermediate node modem in the intermediate node current signal; using the substation node number, intermediate node characteristic code and frequency point to perform binary coding to generate a corresponding intermediate node confirmation code, and broadcasting the intermediate node confirmation code.

8. The system of claim 6, wherein, The intermediate node modem is specifically used for: receiving the table end node current signal sent by the table end node modem; performing Fourier analysis on the table end node current signal to extract the table end node characteristic code and frequency point of the table end node modem in the table end node current signal; using the intermediate node number, table end node characteristic code and frequency point to perform binary coding to generate a corresponding table end node confirmation code, and uploading the table end node confirmation code to the substation node modem, and broadcasting the table end node confirmation code by the substation node modem.

9. The system of claim 7, wherein, The intermediate node modem is specifically used for: determining whether the intermediate node number corresponding to the intermediate node confirmation code matches the intermediate node number corresponding to the intermediate node characteristic code according to the received intermediate node confirmation code and the intermediate node characteristic code, and determining whether the frequency point corresponding to the intermediate node confirmation code matches the frequency point of the selected current modulation; if the intermediate node number corresponding to the intermediate node confirmation code matches the intermediate node number corresponding to the intermediate node characteristic code, and the frequency point corresponding to the intermediate node confirmation code matches the frequency point of the selected current modulation, then determining a target substation node modem according to the substation node number corresponding to the intermediate node confirmation code, and sending intermediate node number information to the target substation node modem.

10. The system of claim 8, wherein, The table end node modem is specifically used for: determining whether the table end node number corresponding to the table end node confirmation code matches the table end node number corresponding to the table end node characteristic code according to the received table end node confirmation code and the table end node characteristic code, and determining whether the frequency point corresponding to the table end node confirmation code matches the frequency point of the selected current modulation; if the table end node number corresponding to the table end node confirmation code matches the table end node number corresponding to the table end node characteristic code, and the frequency point corresponding to the table end node confirmation code matches the frequency point of the selected current modulation, then determining a target intermediate node modem according to the intermediate node number corresponding to the table end node confirmation code, and sending table end node number information to the corresponding substation node modem.

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