A system and method for identifying line-variation relationships

Abstract

The present invention provides a line-transformer relationship identification system and method. An encoding device is installed on the low-voltage side of a distribution transformer, and a decoding device is installed on each feeder of a switchgear or on a branch line of an adjacent switchgear. A master station is in communication with the encoding and decoding devices. The encoding device encodes acquired transformer terminal unit information, and the decoding device decodes the characteristic vector current signal. The master station issues control instructions to the transformer terminal unit to identify the line-transformer relationship. Line-transformer relationship identification is achieved by first encoding and then decoding the transformer terminal unit information. This simple process significantly improves identification efficiency and accuracy, and facilitates maintenance. The characteristic vector current signal in the present invention has a low frequency, strong distribution transformer penetration, and long transmission distance. The present invention has a simple principle, a small size, low cost, and is easily promoted on a large scale, with a wide range of applications.

Description

Technical Field

[0001] The present invention relates to the technical field of distribution networks, and in particular to a line-transformer relationship identification system and method. Background Art

[0002] Distribution networks are characterized by numerous points, a vast area, and long lines. They also feature a large number of devices, a wide distribution range, and a complex communication environment. On one hand, power grid companies' distribution networks are growing in size, with a gradually increasing cabling rate and accelerating urbanization. This leads to frequent expansion, upgrades, and renovations of distribution networks. Especially with increasing load density, new and older distribution networks often have confusion between power transformers, substations, and feeders, posing safety risks. On the other hand, the development of new access services in distribution networks requires a comprehensive understanding of topological information, including network structure, branch routing, and transformer access lines. This allows for better planning and design of the grid connection of distributed generation, electric vehicle charging facilities, and other charging infrastructure.

[0003] The line-to-line relationship refers to the power supply relationship between distribution transformers and the feeders of a high-voltage substation. Since distribution networks generally utilize dual-circuit power supply, the grid dispatcher will close or open certain switches based on actual needs to switch the connection between transformers and lines. Dual-circuit power supply refers to two lines of equal voltage originating from two substations or two feeders from a single substation. If one line experiences a power outage due to a fault, the other line can immediately be switched into service. This dual-circuit system, with one primary and one backup, facilitates maintenance.

[0004] The existing line-transformer relationship in the distribution network is to infer and analyze the connection relationship between transformers and lines based on the closed state of each switch in the grid dispatch. This method requires manual drawing of the distribution network connection relationship in advance, and then judges whether a line is connected or disconnected based on the open and closed states of each switch. The identification process is complicated, and the recognition efficiency and accuracy are both low. In addition, if a transformer is added or removed from the distribution network, the line diagram needs to be manually changed, which is inconvenient for maintenance. Summary of the Invention

[0005] In order to overcome the shortcomings of the above-mentioned prior art, such as the complex identification process, low identification efficiency and accuracy, and inconvenient maintenance, the present invention provides a line-variation relationship identification system, comprising: an encoding device, a decoding device, and a master station;

[0006] The encoding device is installed on the low-voltage side of the distribution transformer, the decoding device is installed on each feeder of the switch cabinet or on the branch line of the adjacent switch cabinet, and the master station is communicatively connected with the encoding device and the decoding device;

[0007] an encoding device for encoding the acquired transformer terminal unit information and sending the encoded characteristic vector current signal to a decoding device;

[0008] A decoding device for decoding the characteristic vector current signal and transmitting decoding information corresponding to the transformer terminal unit to a master station;

[0009] The master station is used to send control instructions to the transformer terminal unit and identify the line-to-transformer relationship based on the decoding information corresponding to the transformer terminal unit, the feeder information where the decoding device is located, and the information of the transformer terminal unit.

[0010] The encoding device includes a first communication unit, a microcontroller and a generator;

[0011] The first communication unit is used to transmit the received information of the transformer terminal unit to the microcontroller;

[0012] The microcontroller is configured to encode the information transmitted by the first communication unit to obtain encoded information;

[0013] The generator is used to generate a characteristic vector current signal based on the encoded information and transmit the characteristic vector current signal to the distribution transformer.

[0014] The encoding device also includes an acquisition unit and a correction unit;

[0015] The microcontroller is further configured to send the preset current threshold to the correction unit;

[0016] The acquisition unit is used to collect the current of the power line between the distribution transformer and the encoding device;

[0017] The correction unit is used to correct the characteristic vector current signal based on a preset current threshold and the current of the power line, and transmit the corrected characteristic vector current signal to the distribution transformer.

[0018] The decoding device comprises:

[0019] a current transformer, configured to adjust the corrected characteristic vector current signal according to its own transformation ratio to obtain an adjusted characteristic vector current signal;

[0020] a filtering circuit, configured to filter the adjusted characteristic vector current signal to obtain a filtered characteristic vector current signal;

[0021] an amplifier circuit, used for amplifying the filtered characteristic vector current signal to obtain an amplified characteristic vector current signal;

[0022] an analog-to-digital conversion circuit, used for converting the amplified characteristic vector current signal into a digital signal;

[0023] A processor, configured to decode the digital signal according to a template matching algorithm to obtain decoding information corresponding to the transformer terminal unit;

[0024] The second communication unit is used to transmit the decoding information corresponding to the transformer terminal unit to the main station through the switch cabinet.

[0025] The master station compares the decoding information corresponding to the transformer terminal unit with the information of the transformer terminal unit. If the decoding information corresponding to the transformer terminal unit is consistent with the information of the transformer terminal unit, it is determined that the distribution transformer corresponding to the transformer terminal unit belongs to the feeder power supply corresponding to the transformer terminal unit; otherwise, it is determined that the distribution transformer corresponding to the transformer terminal unit does not belong to the feeder power supply corresponding to the transformer terminal unit.

[0026] The correction unit compares the current of the power line with a preset current threshold. If the current of the power line is greater than the preset current threshold, the characteristic vector current signal is reduced to the preset current threshold. If the current of the power line is less than the preset current threshold, the characteristic vector current signal is increased to the preset current threshold.

[0027] The encoding device further includes a first power supply unit, which is used to supply power to the first communication unit, the microcontroller, the generator, the acquisition unit and the correction unit.

[0028] The decoding device further includes a second power supply unit, which is used to supply power to the current transformer, the filter circuit, the amplifying circuit, the analog-to-digital conversion circuit, the processor and the second communication unit.

[0029] Based on the same inventive concept, the present invention also provides a method for identifying a linear variation relationship, comprising:

[0030] Install the encoding device on the low-voltage side of the distribution transformer, and install the decoding device on each feeder of the switchgear or the branch line of the adjacent switchgear;

[0031] The master station sends the control instructions to the transformer terminal unit;

[0032] The encoding device encodes the acquired information of the transformer terminal unit and sends the encoded characteristic vector current signal to the decoding device;

[0033] The decoding device decodes the characteristic vector current signal and transmits the decoding information corresponding to the transformer terminal unit to the master station;

[0034] The master station identifies the line-to-transformer relationship based on the decoding information corresponding to the transformer terminal unit, the feeder information where the decoding device is located, and the information of the transformer terminal unit.

[0035] The encoding device encodes the acquired information of the transformer terminal unit and sends the encoded characteristic vector current signal to the decoding device, including:

[0036] The first communication unit in the encoding device transmits the received information of the transformer terminal unit to the microcontroller in the encoding device;

[0037] The microcontroller encodes the information transmitted by the first communication unit to obtain encoded information;

[0038] The generator in the encoding device generates a characteristic vector current signal based on the encoded information and transmits the characteristic vector current signal to the distribution transformer.

[0039] The encoding device encodes the acquired information of the transformer terminal unit and sends the encoded characteristic vector current signal to the decoding device, including:

[0040] The microcontroller sends the preset current threshold to the correction unit in the encoding device;

[0041] The collection unit in the encoding device collects the current of the power line between the distribution transformer and the encoding device;

[0042] The correction unit corrects the characteristic vector current signal based on a preset current threshold and the current of the power line, and transmits the corrected characteristic vector current signal to the distribution transformer.

[0043] The decoding device decodes the characteristic vector current signal and transmits the decoding information corresponding to the transformer terminal unit to the master station, including:

[0044] The current transformer in the decoding device adjusts the corrected characteristic vector current signal according to its own transformation ratio to obtain an adjusted characteristic vector current signal;

[0045] The filtering circuit in the decoding device filters the adjusted characteristic vector current signal to obtain a filtered characteristic vector current signal;

[0046] The amplifier circuit in the decoding device amplifies the filtered characteristic vector current signal to obtain an amplified characteristic vector current signal;

[0047] The analog-to-digital conversion circuit in the decoding device converts the amplified characteristic vector current signal into a digital signal;

[0048] The processor in the decoding device decodes the digital signal according to the template matching algorithm to obtain decoding information corresponding to the transformer terminal unit;

[0049] The second communication unit in the decoding device transmits the decoding information corresponding to the transformer terminal unit to the main station through the switch cabinet.

[0050] The master station identifies the line-to-transformer relationship based on decoding information corresponding to the transformer terminal unit, feeder information where the decoding device is located, and information of the transformer terminal unit, including:

[0051] The master station compares the decoding information corresponding to the transformer terminal unit with the information of the transformer terminal unit. If the decoding information corresponding to the transformer terminal unit is consistent with the information of the transformer terminal unit, it is determined that the distribution transformer corresponding to the transformer terminal unit belongs to the feeder power supply corresponding to the transformer terminal unit; otherwise, it is determined that the distribution transformer corresponding to the transformer terminal unit does not belong to the feeder power supply corresponding to the transformer terminal unit.

[0052] The correction unit corrects the characteristic vector current signal based on a preset current threshold and the current of the power line, including:

[0053] The correction unit compares the current of the power line with a preset current threshold. If the current of the power line is greater than the preset current threshold, the characteristic vector current signal is reduced to the preset current threshold. If the current of the power line is less than the preset current threshold, the characteristic vector current signal is increased to the preset current threshold.

[0054] The technical solution provided by the present invention has the following beneficial effects:

[0055] The line-transformer relationship identification system provided by the present invention includes an encoding device, a decoding device and a master station; the encoding device is installed on the low-voltage side of the distribution transformer, the decoding device is installed on each feeder of the switch cabinet or on the branch line of the adjacent switch cabinet, and the master station is communicatively connected with the encoding device and the decoding device; the encoding device is used to encode the acquired transformer terminal unit information and send the encoded characteristic vector current signal to the decoding device; the decoding device is used to decode the characteristic vector current signal and transmit the decoding information corresponding to the transformer terminal unit to the master station; the master station is used to send a control instruction to the transformer terminal unit, and identify the line-transformer relationship based on the decoding information corresponding to the transformer terminal unit, the feeder information where the decoding device is located, and the information of the transformer terminal unit. The line-transformer relationship identification is achieved by first encoding and then decoding the information of the transformer terminal unit. The process is simple, greatly improves the identification efficiency and accuracy, and is easy to maintain;

[0056] The characteristic vector current signal in the present invention is obtained by encoding the right encoding device at the zero-crossing moment of the power frequency 50Hz. 50Hz is the optimal operating frequency of the distribution transformer. The signal frequency is low, the signal has a strong ability to penetrate the distribution transformer, and the transmission distance is long.

[0057] The correction unit in the present invention can adjust the amplitude strength and phase offset of the characteristic vector current signal according to the current threshold preset by the microcontroller and the power line current collected by the collection unit, thereby increasing the identifiability of the characteristic vector current signal and preventing various interferences.

[0058] The encoding device and decoding device provided by the present invention have simple principles, small size, low cost, and are easy to promote on a large scale;

[0059] The technical solution provided by the present invention is applicable to the identification of power lines and power supply transformers, line phase lines, and branch lines in distribution networks, and is applied to the identification of medium and low voltage power lines and power supply network topology in urban and rural distribution networks that are widely distributed and have complex usage conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0060] Figure 1 This is a structural diagram of a linear variation relationship recognition system according to an embodiment of the present invention;

[0061] Figure 2 Schematic diagram of the installation positions of the encoding device and the decoding device in an embodiment of the present invention;

[0062] Figure 3 is a structural diagram of an encoding device according to an embodiment of the present invention;

[0063] Figure 4 is a structural diagram of a decoding device according to an embodiment of the present invention;

[0064] Figure 5 4 is a flow chart of a method for identifying line variation relationships in an embodiment of the present invention. DETAILED DESCRIPTION

[0065] The present invention will be described in further detail below with reference to the accompanying drawings.

[0066] Example 1

[0067] Embodiment 1 of the present invention provides a linear variation relationship recognition system, such as Figure 1 As shown, it specifically includes: an encoding device, a decoding device and a main station;

[0068] like Figure 2 As shown, the encoding device is installed on the low-voltage side of the distribution transformer, and the decoding device is installed on each feeder of the switch cabinet or on the branch line of the adjacent switch cabinet. The master station is connected to the encoding device and the decoding device in communication. In this embodiment of the present invention, the voltage on the low-voltage side of the distribution transformer is 220V, the voltage on each feeder of the switch cabinet is 10kV, and the ring main unit is a two-input and four-output ring main unit. Figure 2It includes multiple encoding devices and multiple decoding devices. Feeder A, feeder B, feeder C and feeder D are the feeders between the distribution transformer connected to encoding device 1, encoding device 2, encoding device 3 and encoding device 4 and the switch cabinet respectively. Feeder 1 and feeder 2 are the feeders between the switch cabinet and the high-voltage transformer.

[0069] an encoding device for encoding the acquired transformer terminal unit information and sending the encoded characteristic vector current signal to a decoding device;

[0070] A decoding device for decoding the characteristic vector current signal and transmitting the decoding information corresponding to the transformer terminal unit to the master station;

[0071] The master station is used to send control instructions to the transformer terminal unit (TTU) and identify the line-to-transformer relationship based on the decoding information corresponding to the transformer terminal unit, the feeder information where the decoding device is located, and the information of the transformer terminal unit.

[0072] In the embodiment of the present invention, the transformer terminal unit information acquired by the encoding device is the ID information of the transformer terminal unit.

[0073] like Figure 3 As shown, the encoding device includes a first communication unit, a microcontroller and a generator;

[0074] a first communication unit, configured to transmit the received information of the transformer terminal unit to the microcontroller;

[0075] a microcontroller, configured to encode the information transmitted by the first communication unit to obtain encoded information;

[0076] The generator is configured to generate a characteristic vector current signal based on the encoded information and transmit the characteristic vector current signal to the distribution transformer.

[0077] The encoding device also includes an acquisition unit and a correction unit;

[0078] The microcontroller is further used to send the preset current threshold to the correction unit;

[0079] A collection unit, used to collect the current of the power line between the distribution transformer and the encoding device;

[0080] The correction unit is used to correct the characteristic vector current signal based on a preset current threshold and the current of the power line, and transmit the corrected characteristic vector current signal to the distribution transformer.

[0081] like Figure 4 As shown, the decoding device includes:

[0082] a current transformer, configured to adjust the corrected characteristic vector current signal according to its own transformation ratio to obtain an adjusted characteristic vector current signal; in the embodiment of the present invention, the adjusted characteristic vector current signal is 0-20 mA;

[0083] a filtering circuit, configured to filter the adjusted characteristic vector current signal to obtain a filtered characteristic vector current signal;

[0084] an amplifier circuit, used for amplifying the filtered characteristic vector current signal to obtain an amplified characteristic vector current signal;

[0085] an analog-to-digital conversion circuit, used for converting the amplified characteristic vector current signal into a digital signal;

[0086] The processor decodes the digital signal using a template matching algorithm to obtain decoded information corresponding to the transformer terminal unit. Template matching specifically refers to the process of machine recognition, which often requires spatially aligning two or more images of the same scene acquired by different sensors or the same sensor at different times and under different imaging conditions, or searching for a corresponding pattern in another image based on a known pattern. This is called matching. In remote sensing image processing, multispectral images of the same scene acquired by sensors with different wavelengths require point-by-point registration, and then classification based on the properties of the image points. If two photos of the same ground surface taken at different times are aligned and image points with changed features are found, this can be used to analyze which parts of the image have changed. Similarly, when two images of the same object are taken by two sensors spaced a certain distance apart, the distance of the object from the camera, i.e., depth information, can be calculated by identifying corresponding points.

[0087] The second communication unit is used to transmit the decoding information corresponding to the transformer terminal unit to the main station through the switch cabinet.

[0088] In the embodiment of the present invention, the microcontroller in the encoding device and the processor in the decoding device may both be a Field Programmable Gate Array (FPGA) or a digital signal processor (DSP).

[0089] The master station compares the decoded information corresponding to the transformer terminal unit with the information of the transformer terminal unit. If the decoded information corresponding to the transformer terminal unit matches the information of the transformer terminal unit, it is determined that the distribution transformer corresponding to the transformer terminal unit belongs to the feeder power supply corresponding to the transformer terminal unit. Otherwise, it is determined that the distribution transformer corresponding to the transformer terminal unit does not belong to the feeder power supply corresponding to the transformer terminal unit. In this way, all distribution transformers within the entire high-voltage transformer power supply range can be identified.

[0090] The correction unit compares the current of the power line with a preset current threshold. If the current of the power line is greater than the preset current threshold, the characteristic vector current signal is reduced to the preset current threshold. If the current of the power line is less than the preset current threshold, the characteristic vector current signal is increased to the preset current threshold.

[0091] The encoding device further includes a first power supply unit, which is used to supply power to the first communication unit, the microcontroller, the generator, the acquisition unit and the correction unit.

[0092] The decoding device also includes a second power supply unit, which is used to supply power to the current transformer, the filter circuit, the amplification circuit, the analog-to-digital conversion circuit, the processor and the second communication unit.

[0093] Example 2

[0094] Embodiment 2 of the present invention further provides a method for identifying a linear variation relationship, such as Figure 5 The specific process is as follows:

[0095] S101: Install the encoding device on the low-voltage side of the distribution transformer, and install the decoding device on each feeder of the switch cabinet or the branch line of the adjacent switch cabinet;

[0096] S102: The master station sends the control instruction to the transformer terminal unit;

[0097] S103: The encoding device encodes the acquired information of the transformer terminal unit and sends the encoded characteristic vector current signal to the decoding device;

[0098] S104: The decoding device decodes the characteristic vector current signal and transmits the decoding information corresponding to the transformer terminal unit to the master station;

[0099] S105: The master station identifies the line-to-transformer relationship based on the decoding information corresponding to the transformer terminal unit, the feeder information where the decoding device is located, and the information of the transformer terminal unit.

[0100] The encoding device encodes the acquired information of the transformer terminal unit and sends the encoded characteristic vector current signal to the decoding device, including:

[0101] The first communication unit in the encoding device transmits the received information of the transformer terminal unit to the microcontroller in the encoding device;

[0102] The microcontroller encodes the information transmitted by the first communication unit to obtain encoded information;

[0103] The generator in the encoding device generates a characteristic vector current signal based on the encoded information and transmits the characteristic vector current signal to the distribution transformer.

[0104] The encoding device encodes the acquired information of the transformer terminal unit and sends the encoded characteristic vector current signal to the decoding device, including:

[0105] The microcontroller sends the preset current threshold to the correction unit in the encoding device;

[0106] The collection unit in the encoding device collects the current of the power line between the distribution transformer and the encoding device;

[0107] The correction unit corrects the characteristic vector current signal based on a preset current threshold and the current of the power line, and transmits the corrected characteristic vector current signal to the distribution transformer.

[0108] The decoding device decodes the characteristic vector current signal and transmits the decoding information corresponding to the transformer terminal unit to the master station, including:

[0109] The current transformer in the decoding device adjusts the corrected characteristic vector current signal according to its own transformation ratio to obtain an adjusted characteristic vector current signal;

[0110] The filtering circuit in the decoding device filters the adjusted characteristic vector current signal to obtain a filtered characteristic vector current signal;

[0111] The amplifier circuit in the decoding device amplifies the filtered characteristic vector current signal to obtain an amplified characteristic vector current signal;

[0112] The analog-to-digital conversion circuit in the decoding device converts the amplified characteristic vector current signal into a digital signal;

[0113] The processor in the decoding device decodes the digital signal according to the template matching algorithm to obtain decoding information corresponding to the transformer terminal unit;

[0114] The second communication unit in the decoding device transmits the decoding information corresponding to the transformer terminal unit to the master station through the switch cabinet.

[0115] The master station identifies the line-to-transformer relationship based on the decoding information corresponding to the transformer terminal unit, the feeder information where the decoding device is located, and the information of the transformer terminal unit, including:

[0116] The master station compares the decoding information corresponding to the transformer terminal unit with the information of the transformer terminal unit. If the decoding information corresponding to the transformer terminal unit is consistent with the information of the transformer terminal unit, it is determined that the distribution transformer corresponding to the transformer terminal unit belongs to the feeder power supply corresponding to the transformer terminal unit; otherwise, it is determined that the distribution transformer corresponding to the transformer terminal unit does not belong to the feeder power supply corresponding to the transformer terminal unit.

[0117] The correction unit corrects the characteristic vector current signal based on a preset current threshold and the current of the power line, including:

[0118] The correction unit compares the current of the power line with a preset current threshold. If the current of the power line is greater than the preset current threshold, the characteristic vector current signal is reduced to the preset current threshold. If the current of the power line is less than the preset current threshold, the characteristic vector current signal is increased to the preset current threshold.

[0119] For the convenience of description, the various parts of the above device are divided into various modules or units according to their functions and described separately. Of course, when implementing this application, the functions of each module or unit can be implemented in the same or multiple software or hardware.

[0120] Those skilled in the art will appreciate that the embodiments of the present application can be provided as methods, systems, or computer program products. Therefore, the present application can adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment in combination with software and hardware. Moreover, the present application can adopt the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to magnetic disk storage, CD-ROM, optical storage, etc.) that contain computer-usable program code.

[0121] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the steps in the process. Figure 1 a process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0122] These computer program instructions may also be stored in a computer readable memory that can direct a computer or other programmable data processing device to work in a specific manner, so that the instructions stored in the computer readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 a process or multiple processes and / or boxes Figure 1 The function specified in one or more boxes.

[0123] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operational steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing the instructions executed on the computer or other programmable device for implementing the process. Figure 1 a process or multiple processes and / or boxes Figure 1 A step that specifies a function in one or more boxes.

[0124] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Ordinary technicians in the relevant field can still modify or replace the specific implementation methods of the present invention with equivalents by referring to the above embodiments. Any modifications or equivalent replacements that do not depart from the spirit and scope of the present invention are within the scope of protection of the present invention to be approved.

Claims

1. A linear variation relationship recognition system, characterized in that: include: Encoding device, decoding device and master station; The encoding device is installed on the low-voltage side of the distribution transformer, the decoding device is installed on each feeder of the switch cabinet or on the branch line of the adjacent switch cabinet, and the master station is communicatively connected with the encoding device and the decoding device; an encoding device for encoding the acquired transformer terminal unit information and sending the encoded characteristic vector current signal to a decoding device; A decoding device for decoding the characteristic vector current signal and transmitting decoding information corresponding to the transformer terminal unit to a master station; The master station is used to send control instructions to the transformer terminal unit and identify the line-to-transformer relationship based on the decoding information corresponding to the transformer terminal unit, the feeder information where the decoding device is located, and the information of the transformer terminal unit; The encoding device includes a first communication unit, a microcontroller and a generator; The first communication unit is used to transmit the received information of the transformer terminal unit to the microcontroller; The microcontroller is configured to encode the information transmitted by the first communication unit to obtain encoded information; The generator is configured to generate a characteristic vector current signal based on the encoded information and transmit the characteristic vector current signal to the distribution transformer; The encoding device also includes a collection unit and a correction unit; The microcontroller is further configured to send the preset current threshold to the correction unit; The acquisition unit is used to collect the current of the power line between the distribution transformer and the encoding device; The correction unit is used to correct the characteristic vector current signal based on a preset current threshold and the current of the power line, and transmit the corrected characteristic vector current signal to the distribution transformer.

2. The linear variation relationship recognition system according to claim 1, characterized in that: The decoding device comprises: a current transformer, configured to adjust the corrected characteristic vector current signal according to its own transformation ratio to obtain an adjusted characteristic vector current signal; a filtering circuit, configured to filter the adjusted characteristic vector current signal to obtain a filtered characteristic vector current signal; an amplifier circuit, used for amplifying the filtered characteristic vector current signal to obtain an amplified characteristic vector current signal; an analog-to-digital conversion circuit, used for converting the amplified characteristic vector current signal into a digital signal; A processor, configured to decode the digital signal according to a template matching algorithm to obtain decoding information corresponding to the transformer terminal unit; The second communication unit is used to transmit the decoding information corresponding to the transformer terminal unit to the main station through the switch cabinet.

3. The linear variation relationship recognition system according to claim 1, characterized in that: The master station compares the decoding information corresponding to the transformer terminal unit with the information of the transformer terminal unit. If the decoding information corresponding to the transformer terminal unit is consistent with the information of the transformer terminal unit, it is determined that the distribution transformer corresponding to the transformer terminal unit belongs to the feeder power supply corresponding to the transformer terminal unit; otherwise, it is determined that the distribution transformer corresponding to the transformer terminal unit does not belong to the feeder power supply corresponding to the transformer terminal unit.

4. The linear variation relationship recognition system according to claim 1, characterized in that: The correction unit compares the current of the power line with a preset current threshold. If the current of the power line is greater than the preset current threshold, the characteristic vector current signal is reduced to the preset current threshold. If the current of the power line is less than the preset current threshold, the characteristic vector current signal is increased to the preset current threshold.

5. The linear variation relationship recognition system according to claim 1, characterized in that: The encoding device further includes a first power supply unit, which is used to supply power to the first communication unit, the microcontroller, the generator, the acquisition unit and the correction unit.

6. The linear variation relationship recognition system according to claim 2, characterized in that: The decoding device further includes a second power supply unit, which is used to supply power to the current transformer, the filter circuit, the amplifying circuit, the analog-to-digital conversion circuit, the processor and the second communication unit.

7. A method for identifying a linear variation relationship, characterized in that: include: The master station sends the control instructions to the transformer terminal unit; The encoding device installed on the low-voltage side of the distribution transformer encodes the acquired information of the transformer terminal unit and sends the encoded characteristic vector current signal to the decoding device; A decoding device installed on each feeder of the switch cabinet or on a branch line of an adjacent switch cabinet decodes the characteristic vector current signal and transmits decoding information corresponding to the transformer terminal unit to the master station; The master station identifies the line-to-transformer relationship based on the decoding information corresponding to the transformer terminal unit, the feeder information where the decoding device is located, and the information of the transformer terminal unit; The encoding device encodes the acquired information of the transformer terminal unit and sends the encoded characteristic vector current signal to the decoding device, including: The first communication unit in the encoding device transmits the received information of the transformer terminal unit to the microcontroller in the encoding device; The microcontroller encodes the information transmitted by the first communication unit to obtain encoded information; The generator in the encoding device generates a characteristic vector current signal based on the encoded information and transmits the characteristic vector current signal to the distribution transformer.

8. The linear variation relationship recognition method according to claim 7, characterized in that: The encoding device encodes the acquired information of the transformer terminal unit and sends the encoded characteristic vector current signal to the decoding device, including: The microcontroller sends the preset current threshold to the correction unit in the encoding device; The collection unit in the encoding device collects the current of the power line between the distribution transformer and the encoding device; The correction unit corrects the characteristic vector current signal based on a preset current threshold and the current of the power line, and transmits the corrected characteristic vector current signal to the distribution transformer.

9. The linear variation relationship recognition method according to claim 8, characterized in that: The decoding device decodes the characteristic vector current signal and transmits the decoding information corresponding to the transformer terminal unit to the master station, including: The current transformer in the decoding device adjusts the corrected characteristic vector current signal according to its own transformation ratio to obtain an adjusted characteristic vector current signal; The filtering circuit in the decoding device filters the adjusted characteristic vector current signal to obtain a filtered characteristic vector current signal; The amplifier circuit in the decoding device amplifies the filtered characteristic vector current signal to obtain an amplified characteristic vector current signal; The analog-to-digital conversion circuit in the decoding device converts the amplified characteristic vector current signal into a digital signal; The processor in the decoding device decodes the digital signal according to the template matching algorithm to obtain decoding information corresponding to the transformer terminal unit; The second communication unit in the decoding device transmits the decoding information corresponding to the transformer terminal unit to the main station through the switch cabinet.

10. The linear variation relationship recognition method according to claim 7, characterized in that: The master station identifies the line-to-transformer relationship based on decoding information corresponding to the transformer terminal unit, feeder information where the decoding device is located, and information of the transformer terminal unit, including: The master station compares the decoding information corresponding to the transformer terminal unit with the information of the transformer terminal unit. If the decoding information corresponding to the transformer terminal unit is consistent with the information of the transformer terminal unit, it is determined that the distribution transformer corresponding to the transformer terminal unit belongs to the feeder power supply corresponding to the transformer terminal unit; otherwise, it is determined that the distribution transformer corresponding to the transformer terminal unit does not belong to the feeder power supply corresponding to the transformer terminal unit.

11. The linear variation relationship recognition method according to claim 8, characterized in that: The correction unit corrects the characteristic vector current signal based on a preset current threshold and the current of the power line, including: The correction unit compares the current of the power line with a preset current threshold. If the current of the power line is greater than the preset current threshold, the characteristic vector current signal is reduced to the preset current threshold. If the current of the power line is less than the preset current threshold, the characteristic vector current signal is increased to the preset current threshold.

Images