A mobile low-voltage power distribution network topology identification system

Abstract

The utility model discloses a mobile low -voltage distribution network topology identification system, include: transformer, sending module, treater and a plurality of identification module, the sending module detachable connection in distribution network branch outgoing line end and / or electric meter box, electric meter, the incoming line end of electric equipment, a plurality of identification module detachable connection in distribution network transformer outgoing line end and / or branch outgoing line end, the treater is connected with sending module and a plurality of identification module respectively through communication interface, the utility model has solved the inconvenient technical problem of high cost, the bandwidth of occupation and need power off installation of present low -voltage distribution network identification system to the user.

Description

TECHNICAL FIELD

[0001] The utility model relates to topological identification technical field especially relates to a mobile low -voltage distribution network topological identification system. BACKGROUND

[0002] Topology identification technology is a necessary technological foundation for advancing the construction of digital distribution networks. Topology identification methods include big data methods and signal injection methods. Big data-driven methods place high demands on the power grid, requiring each user's load to be adequate and the line topology to be relatively simple. Furthermore, the identification results require multiple iterations, often taking days or even weeks to produce a correct result. Signal injection methods, on the other hand, have lower power grid requirements, offer faster identification speeds, and higher accuracy. These methods typically involve injecting a small characteristic current with a square wave envelope. The identification system includes an edge computing device, several characteristic current identification devices installed on transformer outgoing lines and / or branch lines, and several characteristic current generators installed in electricity meters and / or branch monitoring devices on branch lines. The edge computing device integrates a CCO communication module. In addition to characteristic current transmission and identification functions, the transmitting and identification devices also integrate STA communication modules. The identification process involves the edge computing device, based on known meter records, sequentially notifying the STA communication modules within the transmitting device via its own CCO communication module. The transmitting module then sends out the characteristic current signal. The identification module, in real time, reports the characteristic current signals detected on the line to the edge computing device via its own STA communication module and the edge computing device's CCO communication module. The edge computing device then summarizes and generates a topology identification map of the transformer area. For example, application number CN202022430819.5 discloses a transformer area topology identification system based on an edge computing module, including a master station management module, terminal equipment, and electricity meters. The electricity meters are used to collect electricity usage information of users in the transformer area. The terminal equipment includes an energy controller, a communication module, and at least one edge computing module. The edge computing module collects electricity data from each electricity meter in the transformer area and configures electrical topology data. The energy controller communicates with the master station management module through the communication module and sends the transformer area electrical topology relationship data. While this type of topology identification system can identify the wiring topology of all meters in a distribution area, it requires a large number of new fixed devices, resulting in high costs and difficult maintenance. For example, it requires at least one edge computing device, a characteristic current identification module equal to the number of branches, a sending module equal to the number of meters, and a communication module equal to the total number of edge computing, identification, and sending modules, leading to high costs. Furthermore, the frequency of new meter additions or changes in meter wiring in the distribution network is low, resulting in low equipment utilization. Topology identification cannot be initiated for individual electrical devices or meter files unknown to the edge computing device, resulting in poor flexibility. During real-time topology identification, the edge computing device needs to communicate in real-time with the communication modules bound to the sending and identification modules, consuming communication bandwidth between the edge computing device and other terminals and meters. Moreover, installation requires power outages, causing inconvenience to users. Therefore, there is an urgent need to propose a mobile low-voltage distribution network topology identification system to solve the above technical problems. Utility Model Content

[0003] The main purpose of this invention is to propose a mobile low-voltage distribution network topology identification system, which aims to solve the technical problems of existing low-voltage distribution network identification systems, such as high cost, bandwidth occupation, and inconvenience to users caused by the need for power outages during installation.

[0004] To achieve the above objectives, this utility model provides a mobile low-voltage distribution network topology identification system, wherein the mobile low-voltage distribution network topology identification system includes:

[0005] Transformer, transmitting module, processor, and several identification modules;

[0006] The transmitting module is detachably connected to the branch outlet of the power distribution network and / or the incoming end of the meter box, meter, or electrical equipment; several of the identification modules are detachably connected to the transformer outlet of the power distribution network and / or the branch outlet; the processor is connected to the transmitting module and several identification modules respectively through a communication interface.

[0007] In one preferred embodiment, the transmitting module includes a first MCU unit, a characteristic current transmitting unit, a first communication interface, a first memory, and a piercing current-taking needle. The first MCU unit is connected to the characteristic current transmitting unit, the first communication interface, and the first memory. The characteristic current transmitting unit is connected to the cable conductor at the branch outlet of the power distribution network and / or the inlet of the meter box, meter, or electrical equipment via the piercing current-taking needle.

[0008] In one preferred embodiment, the transmitting 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 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, respectively.

[0009] One preferred embodiment is that the first communication interface adopts a type A USB interface.

[0010] In one preferred embodiment, the piercing power-collecting needle includes a snap-fit ​​mechanism and a spiked conductive needle. The snap-fit ​​mechanism is snapped onto the power distribution cable, and the spiked conductive needle pierces the power distribution cable and connects to the internal cable conductive core.

[0011] In one preferred 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 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 outgoing terminal of the distribution network transformer via a snap-on connection.

[0012] In one preferred embodiment, the identification module further 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 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, respectively.

[0013] In one preferred embodiment, the second communication interface adopts a type A USB interface.

[0014] In the above-described technical solution of this utility model, the mobile low-voltage distribution network topology identification system includes: a transformer, a transmitting module, a processor, and several identification modules; the transmitting module is detachably connected to the branch outgoing end of the distribution network and / or the incoming end of the meter box, meter, or electrical equipment; the several identification modules are detachably connected to the transformer outgoing end and / or the branch outgoing end of the distribution network; the processor is connected to the transmitting module and several identification modules respectively through a communication interface. This utility model only sets up one transmitting module and several identification modules, eliminating the need for edge computing devices and communication modules bound to the transmitting and identification modules, significantly reducing costs. Furthermore, the transmitting module and several identification modules are detachably connected to the distribution transformer area, improving equipment utilization and solving the technical problems of high cost, bandwidth occupation, and inconvenience to users caused by the need for power outages in existing low-voltage distribution network identification systems. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0016] Fig. 1 This is a schematic diagram of a mobile low-voltage distribution network topology identification system installed in a low-voltage distribution network, according to an embodiment of the present invention.

[0017] Fig. 2 This is a schematic diagram of the sending module according to an embodiment of the present utility model;

[0018] Fig. 3 This is a schematic diagram of the identification module in an embodiment of the present invention.

[0019] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the implementation methods and with reference to the accompanying drawings. Detailed Implementation

[0020] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] Furthermore, in this utility model, descriptions involving "first," "second," etc., are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features.

[0022] Furthermore, the technical solutions of the various embodiments of this utility model can be combined with each other, but only if they are based on the ability of a person skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0023] See Figs. 1-3 According to one aspect of this utility model, a mobile low-voltage distribution network topology identification system is provided, wherein the mobile low-voltage distribution network topology identification system includes: a transformer, a transmitting module, a processor, and several identification modules; the transmitting module is detachably connected to the branch outgoing end of the distribution network and / or the incoming end of the meter box, meter, or electrical equipment; several identification modules are detachably connected to the transformer outgoing end and / or the branch outgoing end of the distribution network; the processor is connected to the transmitting module and several identification modules respectively through a communication interface; wherein A is the transformer outgoing end, Bxx is the branch outgoing end, and Cx is the incoming end of the meter box, meter, or electrical equipment.

[0024] Specifically, in this embodiment, the transmitting module includes a first MCU unit, a characteristic current transmitting unit, a first communication interface, a first memory, and a piercing current-taking needle. The first MCU unit is connected to the characteristic current transmitting unit, the first communication interface, and the first memory. The characteristic current transmitting unit is connected to the cable conductor of the branch line of the power distribution network and / or the incoming line of the meter box, meter, or electrical equipment through the piercing current-taking needle. The first MCU unit is the management unit of the transmitting module. In this utility model, the first MCU unit adopts an HC32F460 microcontroller, which is a 32-bit Cortex M4 core with a maximum clock frequency of 168MHz, 512kByte of Flash memory, 192kByte of SRAM, and has interfaces such as USB, SPI, UART, IIC, PWM, and int to interact with peripheral functional unit circuits. After programming, it realizes the management function of the transmitting module. The first communication interface adopts type A. The USB interface can be used to export transmission records or upgrade module programs; the first memory stores transmission records and the current transmission location ID, using a 32MB FLASH memory capable of storing tens of thousands of transmission records; the characteristic current transmission unit converts the weak current system characteristic code output by the MCU into the switching action of the strong current system. According to the group standard of the China Instrument and Control Society, the characteristic current transmission unit adopts a constant current load circuit, with a modulation frequency of 833.3Hz, a bit width of 600ms, a high-level pulse width of 400us, a low-level pulse width of 800us, a characteristic code of 0xAAE9, and a peak current of 420mA. The characteristic code 0xAAE9 is transmitted in binary form at the physical layer. The sequence 1010101011101001 contains 16 bits in total, with 9 bits being 1 and 7 bits being 0. When transmitting bits 1, the transmission duration is 600ms, the duty cycle is one-third, the frequency is 833.3Hz, and the peak current is 420mA. When transmitting bits 0, no current is generated. The entire characteristic current duration is 9.6s. The piercing current-taking needle has a snap-fit ​​mechanism and a spiked conductive needle. During installation, the snap-fit ​​mechanism is used to secure the needle to the power distribution cable. The conductive needle pierces the insulation of the power distribution cable and contacts the conductive core of the cable, converting the switching action of the characteristic current transmitting unit into a characteristic current, which is then transmitted to the power distribution network. The piercing current-taking needle can be installed and removed while the power is on, without the need for a power outage.

[0025] Specifically, in this embodiment, the transmitting 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 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 respectively; the first battery is used to provide power to the transmitting module, and adopts a high-capacity rechargeable 5V lithium battery, or directly uses a 5V output power supply; the first button 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 LCD screen, which can display module function menus, operating conditions, clock, positioning information, and transmitting records, etc. Through the cooperation of the first display unit and the first button unit, the user can interact with the transmitting module; the first clock unit adopts an RX8025T clock chip, which can provide a calendar clock accurate to milliseconds, with a daily timing error of less than 1 second; the first positioning unit adopts a G7A module, which supports Beidou and GPS dual positioning, with a horizontal positioning accuracy of less than 3 meters and an altitude positioning accuracy of less than 4.5 meters.

[0026] 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 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, which is connected to the contact terminal and / or branch line terminal of the distribution network transformer via a snap-on connection. The second MCU unit is the management unit of the entire identification module and also performs characteristic current similarity calculation. It uses a HC32F460 microcontroller, which is a 32-bit Cortex M4 core with a maximum clock frequency of 168MHz, 512kByte of Flash memory, 192kByte of SRAM, and interfaces such as USB, SPI, UART, I2C, PWM, and int for interaction with peripheral functional unit circuits. After programming, it implements the identification module management function and the characteristic current and characteristic code similarity calculation function. The second communication interface uses a type A USB. The interface is used to export identification records or upgrade module programs; the second memory is used to store identification records and the current identification location ID, and uses a 32MB Flash memory that can store tens of thousands of identification records.

[0027] Specifically, in this embodiment, the characteristic current identification unit includes functional circuits such as front-end signal conditioning, signal sampling, analog-to-digital conversion, bandpass filtering, and characteristic current similarity calculation. The front-end signal conditioning circuit consists of clamping diodes, a filter LC circuit, a current-limiting resistor, and a precision resistor that converts the current signal into a voltage signal. In this invention, the signal sampling, analog-to-digital conversion, and bandpass filtering functions implemented by the characteristic current identification unit are achieved using the HT7032L chip from Juquan Microelectronics Co., Ltd. The HT7032L integrates multiple second-order sigma-delta ADCs, a reference voltage circuit, filters, gain amplifiers, etc., with a sampling rate of up to 1843200Hz. The digital signal processed by the HT7032L chip is transmitted to the second MCU unit for characteristic current similarity calculation.

[0028] Specifically, in this embodiment, the characteristic current similarity calculation of the characteristic current identification unit is implemented by a microcontroller of model HC32F460 in the second MCU unit. That is, the calculation of characteristic current similarity can be implemented using a conventional HC32F460 microcontroller, and this invention does not impose any specific limitations; the identification frequency point of the characteristic current signal is obtained. and Identify frequency points Identify frequency points ,in, For modulating signal frequency, The fundamental frequency of the power grid is used in this invention. , This utility model is not specifically limited, and can be set according to needs; it uses the Discrete Fourier Transform algorithm to demodulate and decode the current signal at the identified frequency point, and extracts the kth frequency through the Discrete Fourier Transform algorithm. The frequency domain components; the frequency The frequency domain components are as follows:

[0029]

[0030]

[0031]

[0032] in, , , Frequency The real part, imaginary part, and magnitude of the harmonic current; N is the number of sampling points participating in the discrete Fourier transform operation, and n is the sampling point number. The sampled value of the nth sampling point;

[0033] According to frequency Frequency domain component calculation to identify frequency points and The characteristic current signal sampling effective value; the identification frequency point The effective value of the characteristic current signal sampling is:

[0034]

[0035] The identification frequency point The effective value of the characteristic current signal sampling is:

[0036]

[0037] in, , They are respectively the identification frequency points and The characteristic current signal sampling effective value, , They are respectively the identification frequency points and The magnitude of the harmonic current;

[0038] Based on the identification frequency point and The characteristic current signal sampling effective value determines whether the current line is transmitting bit 1. Based on the calculation result of bit 1 and bit 0 and the similarity with the binary feature code 1010101011101001, it is determined whether the current line is transmitting characteristic current. The characteristic current identification unit monitors the current signal sampled back by the snap-on current transformer in real time. Once the characteristic current is identified, it is stored as an identification record with timestamp, identification location ID, and location information. The snap-on current transformer is snapped onto the transformer output terminal and / or branch line to be detected, and the current signal is collected and transmitted to the characteristic current identification unit. The snap-on current transformer has an opening and closing mechanism to collect the current signal on the distribution cable in a non-contact manner. It can be installed and removed while energized without power outage installation.

[0039] Specifically, in this embodiment, the identification module further 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. The second battery is 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, respectively. The second battery powers the entire identification module and uses a high-capacity rechargeable 5V lithium battery or a 5V output power supply. The second button unit is used for user information input, including menu selection, ID input, and clock input. To balance miniaturization and intelligence, the second display unit uses a small-size dot-matrix LCD screen, which can display function menus, module status, clock, positioning information, identification records, and other information. The second button unit, in conjunction with the second display unit, enables user interaction with the identification module. The second clock unit uses an RX8025T clock chip, which provides a calendar clock accurate to milliseconds with a daily timing error of less than 1 second. The second positioning module uses a G7A module, supporting dual positioning of Beidou and GPS, with a horizontal positioning accuracy of less than 3 meters and an altitude positioning accuracy of less than 4.5 meters.

[0040] Specifically, in this embodiment, the processor has a built-in application for drawing topology maps, running on a computer or in the cloud. It includes functional modules such as a user interface module, a data access module, a business logic module, a communication module, a resource management module, and a log and exception handler. This invention does not impose specific limitations; conventional functional modules can be used. The user interface module interacts with the user, including displaying a graphical interface and receiving user input, such as mouse clicks and keyboard input. The data access module interacts with the database, performing operations such as reading, writing, updating, and deleting data, including importing sending and recognition records, saving node parameters during the drawing process, and exporting topology maps in SVG, DXF, and other formats. The business logic module draws the topology map based on the sending and recognition records. The communication module communicates with online users and the server, enabling online interaction with users and uploading the topology map to the server. The resource management module manages various resources, such as memory, files, and network connections, to ensure the stable operation of the internal program. The log and exception handler records the internal program's running logs, including operation records, error messages, and exception handling.

[0041] The above are merely preferred embodiments of this utility model and do not limit the patent scope of this utility model. Any equivalent structural transformations made based on the inventive concept of this utility model and the contents of this utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of this utility model.

Claims

1. A mobile low-voltage distribution network topology identification system, characterized in that, include: Transformer, transmitting module, processor, and several identification modules; The transmitting module is detachably connected to the branch outlet of the power distribution network and / or the incoming end of the meter box, meter, or electrical equipment; several of the identification modules are detachably connected to the transformer outlet of the power distribution network and / or the branch outlet; the processor is connected to the transmitting module and several identification modules respectively through a communication interface. 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 outgoing terminal of the distribution network transformer via a snap-on connection.

2. The mobile low-voltage distribution network topology identification system according to claim 1, characterized in that, The transmitting module includes a first MCU unit, a characteristic current transmitting unit, a first communication interface, a first memory, and a piercing current-taking needle. The first MCU unit is connected to the characteristic current transmitting unit, the first communication interface, and the first memory. The characteristic current transmitting unit is connected to the cable conductor at the branch outlet of the power distribution network and / or the inlet of the meter box, meter, or electrical equipment through the piercing current-taking needle.

3. A mobile low-voltage distribution network topology identification system according to claim 2, characterized in that, The transmitting 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 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, respectively.

4. A mobile low-voltage distribution network topology identification system according to claim 2, characterized in that, The first communication interface uses a type A USB interface.

5. A mobile low-voltage distribution network topology identification system according to claim 2, characterized in that, The piercing power-taking needle includes a snap-fit ​​mechanism and a spiked conductive needle. The snap-fit ​​mechanism is snapped onto the power distribution cable, and the spiked conductive needle pierces the power distribution cable and connects to the internal cable conductive core.

6. A mobile low-voltage distribution network topology identification system according to any one of claims 1-5, characterized in that, The identification module further 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 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, respectively.

7. A mobile low-voltage distribution network topology identification system according to any one of claims 1-5, characterized in that, The second communication interface uses a type A USB interface.

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