Mobile low-voltage power distribution network topology identification system and method

Abstract

The invention discloses a mobile low-voltage power distribution network topology identification system, which comprises a transformer, a sending module, a processor and a plurality of identification modules, the sending module is detachably connected to a branch wire outlet end of a power distribution network and / or wire inlet ends of an electric meter box, an electric meter and electric equipment; the plurality of identification modules are detachably connected to a power distribution network transformer wire outlet end and / or a branch wire outlet end; the processor is respectively connected with the sending module and the plurality of identification modules through the communication interface. The invention also discloses a mobile low-voltage power distribution network topology identification method. The technical problems that an existing low-voltage power distribution network identification system is high in cost and occupies bandwidth, and inconvenience is brought to users due to the fact that power-off installation is needed are solved.

Description

Technical Field

[0001] The present invention relates to the technical field of topology recognition, and particularly to a mobile low-voltage distribution network topology recognition system and method. Background Art

[0002] Topology recognition technology is a necessary technical foundation for promoting the construction of digital distribution networks. Topology recognition methods include the big data method and the signal injection method. The big data method has high requirements for the power grid, requiring that each user load cannot be too light, the line topology cannot be too complex, and the recognition result needs to be iterated multiple times, often taking several days or even weeks to output the correct result; the signal injection method has low requirements for the power grid, fast recognition speed and high accuracy. The commonly used signal injection method is to inject a small characteristic current of a square wave envelope; the recognition system includes an edge computing device, several characteristic current recognition devices installed on the outgoing line of the transformer and / or branch lines, and several characteristic current generating devices installed in the electric energy meters and / or branch monitoring devices installed on the branch lines; the edge computing device integrates a CCO communication module. In addition to the functions of sending and recognizing characteristic currents, the sending device and the recognizing device also integrate an STA communication module. The recognition process is that the edge computing device, according to the known electric meter file, sequentially notifies the STA communication module in the sending device through its own CCO communication module, so that the sending module sends out the characteristic current. The recognition module reports the characteristic current signal monitored on the line in real time to the edge computing device through its own STA communication module and the CCO communication module of the edge computing device. The edge computing device aggregates and draws the topology recognition map of the transformer substation area. For example, the application number CN202022430819.5 discloses a transformer substation area topology recognition system based on an edge computing module, including a master station management module, a terminal device and an electric energy meter. The electric energy meter is used to collect the electricity consumption of users in the transformer substation area; the terminal device includes an energy controller, a communication module and at least one edge computing module. The edge computing module collects the electricity data of each electric energy meter in the transformer substation area and configures the electrical topology data. The energy controller communicates with the master station management module through the communication module and sends the electrical topology relationship data of the transformer substation area. Although the topology recognition system of this mode can realize the wiring topology of all electric meters in the transformer substation area, it needs to add a large number of fixed devices, with high cost and difficult maintenance. For example, at least one edge computing device needs to be set, as well as a characteristic current recognition module with the same number as the number of branches, a sending module with the same number as the number of electric meters, and a communication module with the same total number as the edge computing module, the recognition module and the sending module, with high cost; and the frequency of new electric meters or changes in the wiring of electric meters in the distribution network is not high, resulting in low utilization rate of the equipment. For individual electrical equipment and electric meter files unknown to the edge computing device, topology recognition cannot be initiated, with poor flexibility. During the implementation of topology recognition, the edge computing device needs to communicate with the communication module bound to the sending module and the recognition module in real time, occupying the communication bandwidth between the edge computing device and other terminals and electric meters; and power outage is required for installation, causing inconvenience to users. Therefore, it is urgent to propose a mobile low-voltage distribution network topology recognition system and method to solve the above technical problems. Summary of the Invention

[0003] The main object of the present invention is to provide a mobile low-voltage distribution network topology identification system and method, aiming to solve the technical problems of high cost, occupied bandwidth and inconvenience to users caused by power outage installation in the existing low-voltage distribution network identification system.

[0004] To achieve the above object, the present invention provides a mobile low-voltage distribution network topology identification system, wherein the mobile low-voltage distribution network topology identification system includes:

[0005] A transformer, a sending module, a processor and a plurality of identification modules;

[0006] The sending module is detachably connected to the branch outgoing line end of the distribution network and / or the incoming line end of the meter box, meter, and electrical equipment; a plurality of the identification modules are detachably connected to the transformer outgoing line end and / or the branch outgoing line end of the distribution network; the processor is connected to the sending module and a plurality of identification modules through communication interfaces respectively.

[0007] One of the preferred solutions, the sending module includes a first MCU unit, a characteristic current sending unit, a first communication interface, a first memory, and a puncture power-taking needle. The first MCU unit is respectively connected to the characteristic current sending unit, the first communication interface, and the first memory. The characteristic current sending unit is connected to the cable conductive core of the branch outgoing line end of the distribution network and / or the incoming line end of the meter box, meter, and electrical equipment through the puncture power-taking needle.

[0008] One of the preferred solutions, the sending module further includes a first display unit, a first button unit, a first battery, a first clock unit, and a first positioning unit; the first display unit, the first button unit, the first clock unit, and the first positioning unit are connected to the first MCU unit, and the first battery is respectively connected to the first display unit, the first button unit, the first MCU unit, the first clock unit, the first positioning unit, and the first memory.

[0009] One of the preferred solutions, the identification module includes a second MCU unit, a characteristic current identification unit, a second communication interface, a second memory, and a snap-on current transformer; the second MCU unit is respectively connected to the characteristic current identification unit, the second communication interface, and the second memory. The characteristic current identification unit is connected to the snap-on current transformer, and the snap-on current transformer is connected to the transformer contact end and / or the branch outgoing line end of the distribution network through a snap.

[0010] One of the preferred solutions, the recognition module further includes a second display unit, a second key unit, a second battery, a second clock unit, and a second positioning unit; the second display unit, the second key unit, the second clock unit, and the second positioning unit are connected to the second MCU unit, and the second battery is respectively connected to the second display unit, the second key unit, the second MCU unit, the second clock unit, the second positioning unit, and the second memory.

[0011] A method for identifying the topology of a mobile low-voltage distribution network includes the following steps:

[0012] S1. Clear the records of the sending module and the recognition module and calibrate the time.

[0013] S2. Install the recognition module at the transformer outlet end and / or the branch outlet end, set the ID of the current location, and start recognition and recording; if the recognition module recognizes a characteristic current signal, generate a recognition record and store it in the second memory.

[0014] S3. Install the sending module at the branch outlet end and / or the meter box, meter, and the inlet end of the electrical equipment in sequence. When the sending module emits a characteristic current, generate a sending record and store it in the first memory.

[0015] S4. After all the nodes to be measured at the branch outlet end and / or the meter box, meter, and the inlet end of the electrical equipment have completed the sending of the characteristic current, remove the sending module and several recognition modules, and export the sending records and recognition records of the sending module and the recognition module to generate a topology diagram of the distribution network.

[0016] One of the preferred solutions, the recognition record includes the ID of the location where the recognition module is located, the positioning information, and the time stamp of the recognized characteristic current signal.

[0017] One of the preferred solutions, the sending record includes the ID of the location where the sending module is located, the positioning information, and the time stamp of the sent characteristic current signal.

[0018] One of the preferred solutions, the time interval for the sending module to continuously send the characteristic current signal is greater than or equal to the first time.

[0019] One of the preferred solutions, in step S4, exporting the sending records and recognition records of the sending module and the recognition module to generate a topology diagram of the distribution network is specifically as follows:

[0020] S41. Export the sending records and recognition records of the sending module and the recognition module respectively.

[0021] S42. Read the first sending record according to the time stamp order, and query whether there is an identification record within the second time after the time stamp of the current sending record in the identification records; if not, the parent node of the ID of the current sending record is 0, that is, the current node does not belong to this distribution area; if so, determine the IDs of all identification records within the second time as the parent nodes of the ID of the current sending record; read the next sending record according to the time stamp order.

[0022] S43. Determine whether the number of parent nodes of the ID of the sending record with a non-zero number of parent nodes is greater than 1. If so, further determine the relationship between the parent nodes according to the identification records to obtain a complete distribution network topology diagram.

[0023] In the above technical solution of the present invention, the mobile low-voltage distribution network topology identification system includes: a transformer, a sending module, a processor, and a plurality of identification modules; the sending module is detachably connected to the branch outgoing line end of the distribution network and / or the incoming line end of the meter box, the meter, and the electrical equipment; a plurality of the identification modules are detachably connected to the outgoing line end of the distribution network transformer and / or the branch outgoing line end; the processor is connected to the sending module and a plurality of identification modules respectively through a communication interface. The present invention only sets one sending module and a plurality of identification modules, without setting an edge computing device and a communication module bound to the sending module and the identification module, greatly reducing the cost, and the sending module and a plurality of identification modules are detachably connected to the distribution area, improving the utilization rate of the equipment, and solving the technical problems of high cost, occupied bandwidth and inconvenient power outage installation for users in the existing low-voltage distribution network identification system. Description of the Drawings

[0024] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on the structures shown in these drawings.

[0025] Figure 1 It is a schematic diagram of a mobile low-voltage distribution network topology identification system according to an embodiment of the present invention installed in a low-voltage distribution network;

[0026] Figure 2 It is a schematic diagram of the sending module according to an embodiment of the present invention;

[0027] Figure 3 It is a schematic diagram of the identification module according to an embodiment of the present invention;

[0028] Figure 4 It is a schematic diagram of a mobile low-voltage distribution network topology identification method according to an embodiment of the present invention;

[0029] Figure 5 Schematic diagram for generating the topology diagram of the distribution network in the embodiment of the present invention.

[0030] The realization, functional features and advantages of the object of the present invention will be further described in conjunction with the embodiments with reference to the accompanying drawings. Specific embodiments

[0031] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0032] In addition, in the present invention, descriptions such as "first" and "second" are only for descriptive purposes, and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one of such features.

[0033] Moreover, the technical solutions between various embodiments of the present invention can be combined with each other, but it must be based on the ability of those of ordinary skill in the art to implement. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the protection scope required by the present invention.

[0034] See Figures 1-3 , according to one aspect of the present invention, the present invention provides a mobile low-voltage distribution network topology identification system, wherein the mobile low-voltage distribution network topology identification system includes: a transformer, a sending module, a processor and a plurality of identification modules; the sending module is detachably connected to the branch outgoing line end of the distribution network and / or the incoming line end of the meter box, meter and electrical equipment; a plurality of the identification modules are detachably connected to the outgoing line end of the distribution network transformer and / or the branch outgoing line end; the processor is connected to the sending module and a plurality of identification modules respectively through a communication interface; wherein, A is the outgoing line end of the transformer, Bxx is the branch outgoing line end, and Cx is the incoming line end of the meter box, meter and electrical equipment.

[0035] Specifically, in this embodiment, the sending module includes a first MCU unit, a characteristic current sending unit, a first communication interface, a first memory, and a puncture power-taking needle. The first MCU unit is respectively connected to the characteristic current sending unit, the first communication interface, and the first memory. The characteristic current sending unit is connected to the cable conductive core of the branch outgoing line end of the distribution network and / or the incoming line end of the meter box, meter, and electrical equipment through the puncture power-taking needle. The first MCU unit is the management unit of the sending module. In the present invention, the first MCU unit uses a single-chip microcomputer with the model HC32F460. The single-chip microcomputer is a 32-bit Cortex M4 core, with a maximum main frequency of 168 MHz, 512 kByte of Flash memory, and 192 kByte of SRAM. It has interfaces such as USB, SPI, UART, IIC, PWM, int, etc. to interact with the peripheral functional unit circuits. After burning the program, the management function of the sending module is realized. The first communication interface uses a type A USB interface, which can be used to export the sending record or upgrade the module program. The first memory is used to store the sending record and the current sending position ID. It uses a FLASH memory with a capacity of 32 MB and can store tens of thousands of sending records. The characteristic current sending unit converts the weak electrical system characteristic code output by the MCU into a switching action of the strong electrical system. According to the group standard of the China Instrumentation Industry Association, the characteristic current sending unit adopts a constant current load circuit, with a modulation frequency of 833.3 Hz, a bit width time of 600 ms, a high-level pulse width of 400 us, a low-level pulse width of 800 us, a characteristic code of 0xAAE9, and a current peak value of 420 mA. The characteristic code 0xAAE9 transmits binary 1010101011101001 in the physical layer, a total of 16 bit positions, 9 bit positions of 1, and 7 bit positions of 0. When sending bit 1, a current with a sending duration of 600 ms, a duty cycle of one-third, a frequency of 833.3 Hz, and a peak value of 420 mA is sent. When sending bit 0, no current is generated. The entire characteristic current duration is 9.6 s. The puncture power-taking needle has a snap-type mechanism and a spiked conductive needle. During installation, the snap-type mechanism is used to clamp onto the power distribution cable, and the conductive needle pierces the insulation skin of the power distribution cable to contact the cable conductive core, converting the switching action of the characteristic current sending unit into a characteristic current and transmitting it to the distribution network. The puncture power-taking needle can be installed and disassembled while being energized, without the need for power outage installation.

[0036] Specifically, in this embodiment, the sending module further includes a first display unit, a first key unit, a first battery, a first clock unit, and a first positioning unit; the first display unit, the first key unit, the first clock unit, and the first positioning unit are connected to the first MCU unit, and the first battery is respectively connected to the first display unit, the first key unit, the first MCU unit, the first clock unit, the first positioning unit, and the first memory; the first battery is used to provide power for the sending module, and a large-capacity rechargeable 5V lithium battery is adopted, or a 5V output power supply is directly used; the first key unit is used for user information input, including menu selection, ID input, and clock input; to balance miniaturization and intelligence, the first display unit adopts a small-size dot matrix liquid crystal screen, which can display module function menus, working conditions, clocks, positioning information, sending records, and other information. Through the cooperation of the first display unit and the first key unit, the interaction between the user and the sending module is realized; the first clock unit adopts a clock chip with the model RX8025T, which can provide a calendar clock accurate to milliseconds, and the daily timing error is less than 1 s; the first positioning unit adopts a G7A module, which supports dual positioning of Beidou and GPS, with a horizontal positioning accuracy of less than 3 m and an altitude positioning accuracy of less than 4.5 m.

[0037] Specifically, in this embodiment, the identification module includes a second MCU unit, a characteristic current identification unit, a second communication interface, a second memory, and a snap-on current transformer; the second MCU unit is respectively connected to the characteristic current identification unit, the second communication interface, and the second memory, the characteristic current identification unit is connected to the snap-on current transformer, and the snap-on current transformer is connected to the contact end and / or the branch outgoing line end of the distribution network transformer through a snap; the second MCU unit is the management unit of the entire identification module, and at the same time realizes the calculation of the similarity of characteristic currents. A single-chip microcomputer with the model HC32F460 is adopted. The single-chip microcomputer is a 32-bit CortexM4 core, with a maximum main frequency of 168 MHz, 512 kByte of Flash memory, and 192 kByte of SRAM, and has interfaces such as USB, SPI, UART, I2C, PWM, int, etc. to interact with the peripheral functional unit circuits; after the program is burned, the management function of the identification module and the function of calculating the similarity between the characteristic current and the characteristic code are realized; the second communication interface adopts a typeA USB interface, which is used to export identification records or upgrade the module program; the second memory is used to store identification records and the current identification position ID, and a Flash memory with a capacity of 32 MB is adopted, which can store tens of thousands of identification records.

[0038] Specifically, in this embodiment, the characteristic current identification unit includes functional circuits such as front-end signal conditioning, signal sampling, analog-to-digital conversion, band-pass filtering, and characteristic current similarity calculation; the front-end signal conditioning circuit is composed of a clamping diode, a filtering LC circuit, a current-limiting resistor, and a precision resistor for converting the current signal into a voltage signal. In the present invention, the signal sampling, analog-to-digital conversion, and band-pass filtering functions implemented by the characteristic current identification unit are realized by the HT7032L chip of Giantec Semiconductor Corporation. The HT7032L integrates multiple channels of second-order sigma-delta ADC, a reference voltage circuit, a filter, a gain amplifier, etc., and the sampling rate can reach 1843200 Hz. The digital signal processed by the HT7032L chip is transmitted to the second MCU unit for characteristic current similarity calculation.

[0039] Specifically, in this embodiment, the characteristic current similarity calculation of the characteristic current identification unit is specifically as follows: obtaining the identification frequency points f1 and f2 of the characteristic current signal; the identification frequency point f1 = f0 - f b , the identification frequency point f2 = f0 + f b , where f0 is the modulation signal frequency, and f b is the power grid fundamental frequency. In the present invention, f0 = 833.3 Hz, and f b = 50 Hz. The present invention does not make specific limitations and can be specifically set according to needs; the discrete Fourier transform algorithm is used to demodulate the current signal at the identification frequency points and perform decoding processing, and the frequency-domain component of the kth frequency f k is extracted through the discrete Fourier transform algorithm; the frequency-domain components of the frequency f k are respectively:

[0040]

[0041] Among them, a k , b k , c k are respectively the real part, imaginary part, and modulus of the harmonic current at the frequency f k ; N is the number of sampling points participating in the discrete Fourier transform operation, n is the sampling point serial number, is the sampling value of the nth sampling point;

[0042] According to the frequency-domain components of the frequency f k , calculate the sampling effective values of the characteristic current signals at the identification frequency points f1 and f2; the sampling effective value of the characteristic current signal at the identification frequency point f1 is:

[0043]

[0044] The sampling effective value of the characteristic current signal at the identification frequency point f2 is:

[0045]

[0046] Among them, s1 and s2 are respectively the effective sampling values of the characteristic current signals for identifying the frequency points f1 and f2, and c k1 and c k2 are respectively the magnitudes of the harmonic currents of the frequency points f1 and f2 for identification;

[0047] It is judged whether the current line is sending bit 1 according to the effective sampling values of the characteristic current signals of the identification frequency points f1 and f2. Whether the current line is sending the characteristic current is judged according to the similarity between the calculation results of bit 1 and bit 0 and the binary characteristic code 1010101011101001. The characteristic current identification unit monitors the current signal sampled by the snap-on current transformer in real time. Once the characteristic current is identified, it is marked with a timestamp, the position ID at the time of identification, and the positioning information, and stored as an identification record; the snap-on current transformer is clamped on the outgoing line end and / or branch line of the transformer to be detected, collects the current signal and transmits it to the characteristic current identification unit. The snap-on current transformer has an opening and closing mechanism, collects the current signal on the power distribution cable in a non-contact manner, and can be installed and disassembled while energized without power outage installation.

[0048] Specifically, in this embodiment, the identification module further includes a second display unit, a second key unit, a second battery, a second clock unit and a second positioning unit; the second display unit, the second key unit, the second clock unit and the second positioning unit are connected to the second MCU unit, and the second battery is respectively connected to the second display unit, the second key unit, the second MCU unit, the second clock unit, the second positioning unit and the second memory; the second battery is used to supply power to the entire identification module, and a large-capacity rechargeable 5V lithium battery or a power supply with a 5V output is adopted; the second key unit is used for user information input, including menu selection, ID input and clock input; in order to balance miniaturization and intelligence, a small-size dot matrix liquid crystal screen is selected for the second display unit, which can display function menus, module working conditions, clocks, positioning information, identification records and other information; the second key unit cooperates with the second display unit to realize the interaction between the user and the identification module; the second clock unit adopts a clock chip of model RX8025T, which can provide a calendar clock accurate to milliseconds, and the daily timing error is less than 1 second; the second positioning module adopts a G7A module, supports dual positioning of Beidou and GPS, the horizontal positioning accuracy is less than 3 meters, and the altitude positioning accuracy is less than 4.5 meters.

[0049] Specifically, in this embodiment, the processor is built-in with an application program for drawing a topology diagram, which runs on a computer or in the cloud and includes functional modules such as a user interface module, a data access module, a business logic module, a communication module, a resource management module, a log and exception processor, etc. The present invention does not make specific limitations, and conventional functional modules can be used to implement them. The user interface module is used to interact with users, including displaying a graphical interface and receiving user inputs such as mouse clicks and keyboard inputs; the data access module is used to interact with a database to implement operations such as data reading, writing, updating, and deleting, including importing sending records and recognition records, saving node parameters during the drawing process, and exporting topology diagrams in formats such as SVG and DXF; the business logic module is used to draw a topology diagram according to the sending records and recognition records; the communication module is responsible for communicating with online users and the server to implement functions such as online interaction with users and uploading the topology diagram to the server; the resource management module is used to manage various resources such as memory, files, and network connections to ensure the stable operation of internal programs; the log and exception processor is used to record the running logs of internal programs, including operation records, error messages, exception handling, etc.

[0050] See Figure 4 , according to another aspect of the present invention, the present invention provides a method for identifying the topology of a mobile low-voltage distribution network. Among them, the method for identifying the topology of a mobile low-voltage distribution network includes the following steps:

[0051] S1. Clear the records of the sending module and the recognition module and calibrate the time; that is, for the ID, sending records, and recognition record status of the sending module and the recognition module, accurately record the time to the second;

[0052] S2. Install the recognition module at the outlet end of the transformer and / or the outlet end of the branch, set the ID of the current location, and start recognition and recording; if the recognition module recognizes a characteristic current signal, generate a recognition record and store it in the second memory;

[0053] S3. Install the sending module at the outlet end of the branch and / or the meter box, meter, and the inlet end of the electrical equipment in sequence. The sending module emits a characteristic current. Before emitting the characteristic current, input the ID of the location through the case. After the sending is completed, generate a sending record and store it in the first memory;

[0054] S4. After all the nodes to be measured at the outgoing line terminals and / or the incoming line terminals of the meter box, meters, and electrical equipment have completed the transmission of the characteristic current, remove the transmission module and several identification modules, and export the transmission records and identification records of the transmission module and the identification modules to generate a distribution network topology diagram. If only the parent-child relationships between a few nodes need to be determined, the transmission records and identification records can be viewed through the first display unit and the second display unit of the transmission module and the identification modules and manually confirmed. If there are more nodes to be determined, the transmission records and identification records can be exported separately through the transmission module and the identification modules, and the distribution network topology diagram can be automatically generated by the processor.

[0055] Specifically, in this embodiment, the identification record includes the ID of the location where the identification module is located, the positioning information, and the time stamp of identifying the characteristic current signal.

[0056] Specifically, in this embodiment, the transmission record includes the ID of the location where the transmission module is located, the positioning information, and the time stamp of transmitting the characteristic current signal.

[0057] Specifically, in this embodiment, the time interval between consecutive transmissions of the characteristic current signal by the transmission module is greater than or equal to the first time. Considering that the time for each characteristic current transmission is T', and the calculation time for each identification is T'', considering the timing error, the lower limit of the time interval between two transmissions is set as the first time. In the present invention, the first time is 60 s. The present invention does not make specific limitations and can be specifically set according to needs.

[0058] Specifically, in this embodiment, see Figure 5 , in step S4, exporting the transmission records and identification records of the transmission module and the identification modules to generate a distribution network topology diagram is specifically as follows:

[0059] S41. Export the transmission records and identification records of the transmission module and the identification module respectively;

[0060] S42. Read the first transmission record according to the time stamp order, and query whether there is an identification record within the second time after the time stamp of the current transmission record in the identification records. If not, the parent node of the ID of the current transmission record is 0, that is, the current node does not belong to this substation area. If so, determine the IDs of all identification records within the second time as the parent nodes of the ID of the current transmission record, and determine the ID of the current transmission record as the child node of the ID of the identification record. Read the next transmission record according to the time stamp order until all transmission records are read. Among them, in the present invention, the second time is 50 s. The present invention does not make specific limitations and can be specifically set according to needs;

[0061] S43. Determine whether the number of parent nodes of the ID of the sending record with a non-zero number of parent nodes is greater than 1. If so, further determine the relationship between each parent node according to the recognition record, so as to obtain a complete distribution network topology diagram. For example: If A, B11, and B31 are all parent nodes of C2, A and B11 are parent nodes of B31, and A is the parent node of B11, then it is merged into: A (grandparent node) → B11 (parent node) → B31 (child node) → C2 (grandchild node). After the parent-child node analysis of the IDs of all sending records with multiple parent nodes is completed, the parent-child relationship between each node is integrated to output the topology diagram.

[0062] The above are only the preferred embodiments of the present invention, and do not limit the patent scope of the present invention accordingly. Any equivalent structural transformation made by using the content of the specification and drawings of the present invention under the inventive concept of the present invention, or any direct / indirect application in other related technical fields is included in the patent protection scope of the present invention.

Claims

1. A mobile low-voltage distribution network topology identification system, characterized in that: include: A transformer, a transmission module, a processor and several identification modules; The sending module can be detachably connected to the branch outlet of the distribution network and / or the incoming line of the meter box, meter, and electrical equipment; several identification modules can be detachably connected to the outlet of the distribution network transformer and / or the branch outlet; the processor is respectively connected to the sending module and several identification modules through the communication interface.

2. A mobile low-voltage distribution network topology identification system according to claim 1, characterized in that: The sending module includes a first MCU unit, a characteristic current sending unit, a first communication interface, a first memory and a puncture-type electricity collection needle. The first MCU unit is connected to the characteristic current sending unit, the first communication interface and the first memory respectively. The characteristic current sending unit is connected to the cable conductive core of the branch outlet of the distribution network and / or the incoming line end of the meter box, the meter and the electrical equipment through the puncture-type electricity collection needle.

3. A mobile low-voltage distribution network topology identification system according to claim 2, characterized in that: The sending module also includes a first display unit, a first button unit, a first battery, a first clock unit and a first positioning unit; the first display unit, the first button unit, the first clock unit and the first positioning unit are connected to the first MCU unit, and the first battery is respectively connected to the first display unit, the first button unit, the first MCU unit, the first clock unit, the first positioning unit and the first memory.

4. A mobile low-voltage distribution network topology identification system according to any one of claims 1 to 3, characterized in that: The identification module includes a second MCU unit, a characteristic current identification unit, a second communication interface, a second memory and a snap-on current transformer; the second MCU unit is connected to the characteristic current identification unit, the second communication interface and the second memory respectively, the characteristic current identification unit is connected to the snap-on current transformer, and the snap-on current transformer is connected to the contact terminal and / or branch outlet terminal of the distribution network transformer through a snap.

5. A mobile low-voltage distribution network topology identification system according to claim 4, characterized in that: The identification module also includes a second display unit, a second button unit, a second battery, a second clock unit and a second positioning unit; the second display unit, the second button unit, the second clock unit and the second positioning unit are connected to the second MCU unit, and the second battery is respectively connected to the second display unit, the second button unit, the second MCU unit, the second clock unit, the second positioning unit and the second memory.

6. A topology identification method comprising a mobile low-voltage distribution network topology identification system according to any one of claims 1 to 5, characterized in that: The following steps are involved: S1. Clear the records of the sending module and the identification module and calibrate the time; S2. Install an identification module at the transformer outlet and / or branch outlet, set the ID of the current location, and start identification and recording; If the recognition module recognizes the characteristic current signal, an recognition record is generated and stored in the second memory; S3, sequentially installing a sending module at the branch outlet and / or the meter box, the meter, and the incoming end of the electrical equipment, wherein the sending module sends a characteristic current, and then generates a sending record and stores it in the first memory; S4. After all nodes to be tested at the branch outlet and / or the meter box, meter, and incoming line of electrical equipment have completed the transmission of characteristic current, the sending module and several identification modules are removed, and the sending records and identification records of the sending module and the identification module are exported to generate a distribution network topology diagram.

7. A mobile low-voltage distribution network topology identification system according to claim 6, characterized in that: The identification record includes an ID of the location of the identification module, positioning information, and a timestamp of the identification characteristic current signal.

8. A mobile low-voltage distribution network topology identification system according to claim 6, characterized in that: The sending record includes the ID of the location of the sending module, positioning information and the timestamp of sending the characteristic current signal.

9. A mobile low-voltage distribution network topology identification system according to claim 6, characterized in that: The time interval for the sending module to continuously send the characteristic current signal is greater than or equal to the first time.

10. A mobile low-voltage distribution network topology identification system according to claim 6, characterized in that: In step S4, the sending records and identification records of the sending module and the identification module are exported to generate a distribution network topology map, specifically: S41, exporting the sending record and the identification record of the sending module and the identification module respectively; S42, read the first sending record in order according to the timestamp, and query in the identification record whether there is an identification record within the second time after the current sending record time stamp; if not, the parent node of the ID of the current sending record is 0, that is, the current node does not belong to this station area; if it exists, the IDs of all identification records within the second time are determined as the parent nodes of the ID of the current sending record; read the next sending record in order according to the timestamp; S43. Determine whether the number of parent nodes of the ID of the sending record whose number of parent nodes is not 0 is greater than 1. If so, further determine the relationship between the parent nodes according to the identification record to obtain a complete distribution network topology map.

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