Mongolian intelligent terminal for topology identification

Abstract

According to the technical scheme, the terminal comprises a main control module, an alternating current acquisition module, a 485 module, a wireless public network module, a carrier module, a clock module, a display module, a power supply and standby power module, a Bluetooth module, an Ethernet module, a remote signaling module, a branch monitoring module and a remote control module. The terminal sequentially sends special fixed-frequency modulation signals to each user meter in a carrier mode, the electric energy meter sends characteristic small current signals at specific time after receiving instructions, the terminal samples the special small current signals through an external mutual inductor, the special small current signals are transmitted to a branch monitoring module to be demodulated and calculated to form data messages, and then the data messages are acquired by a master station through interrogation. Therefore, a clear transformer area topology architecture can be obtained. The terminal realizes electric energy metering monitoring and advanced calculation by applying a modern digital communication technology, an embedded technology, a computer software and hardware technology and the like, can be particularly used for area topology identification, is fast in data processing and high in cost performance, and can well meet the application requirements of a power grid.

Description

Technical Field

[0001] The present invention relates to the technical field of intelligent power grid substation area topology recognition, and particularly to a topology recognition function of a Mengxi intelligent terminal for topology recognition, which is applicable to low-voltage substation area topology recognition. Background Art

[0002] In recent years, power grid companies have gradually promoted the construction of intelligent power grids for electricity use. With the improvement of the living standards of residential users, the power consumption load of the power grid has gradually increased, and power consumption problems have gradually increased. In reality, the number of low-voltage residential users is huge and widely distributed. Affected by the complex installation conditions and many restrictions of the distribution room transformers, the branch lines of the circuit are messy, resulting in the inability to determine the topology structure of the substation area. When problems such as safety failures and abnormal line losses occur, a large amount of human resources are required to conduct inspections and positioning, with low efficiency and high operation and maintenance costs. These typical problems have added layers of resistance to the safety, management, and maintenance of intelligent power grids.

[0003] The topology relationship of the low-voltage substation area is a key part of the construction of high-quality substations and an indispensable part of the application of the intelligent power grid system. How to obtain the accurate topology relationship of the low-voltage substation area has become an important direction for the construction of intelligent power grids. Summary of the Invention

[0004] The present invention aims to overcome the problems existing in the line topology recognition technology of power grid substations and provides a Mengxi intelligent terminal for topology recognition.

[0005] To achieve the above-mentioned invention purpose, the purpose of the present invention can be achieved through the following technical solutions:

[0006] A Mengxi intelligent terminal for topology recognition includes that the Mengxi intelligent terminal sequentially sends special fixed-frequency modulation signals to each user side through power line carrier communication according to the electricity meter address. After receiving the instruction, the electricity meter will send a characteristic small current signal at a specific time. The terminal samples the special small current signal through an externally connected current transformer and transmits it to the branch monitoring module for demodulation and calculation to form a data packet that can be called and obtained by the master station. After the master station calls the packet, it can gradually determine the attribution of different electricity meters, thereby being able to obtain a clear substation area topology structure and quickly conduct inspections and positioning in case of line failures. This terminal applies modern digital communication technology, computer software and hardware technology, embedded technology, etc. to realize power metering monitoring and advanced calculation. In particular, it can be used for the topology recognition of low-voltage substation areas in the power system, with fast data processing and high cost performance, and can well meet the application requirements of the power grid.

[0007] The Mengxi intelligent terminal for topology recognition includes a main control module, an AC sampling module, a carrier module, a 485 module, a wireless public network module, a clock module, a display module, a power supply and backup power module, a Bluetooth module, an Ethernet module, a remote signaling module, a branch monitoring module, and a control module. When performing topology recognition, it can also meet the basic functions of the Mengxi power consumption information acquisition terminal.

[0008] The main control module is the core of the entire terminal, coordinating the work of each module through various peripheral ports. Its CPU chip has a main frequency greater than 1G and is a multi-core processor, with fast operation speed, large data storage space, and can control function modules such as the AC sampling module, the carrier module, and the branch monitoring module in real time;

[0009] The AC sampling module is the AC sampling and metering unit of the terminal, sampling the instantaneous values of voltage and current multiple times, processing the data according to a certain algorithm, and statistically analyzing each data volume;

[0010] The carrier module is a local communication module, using a self-designed broadband carrier chip, with the power line as the carrier signal transmission medium, and can support functions such as substation area or phase differentiation, information active reporting, and automatic networking;

[0011] The 485 module is a functional circuit module. The terminal can communicate with the electric energy meter in a downlink manner through 485 communication. The module uses optocoupler isolation to ensure the safety and reliability of the system;

[0012] The wireless public network module is a functional circuit module. The terminal can communicate with the master station in an uplink manner through 4G communication, and this module supports logging in to dual master stations, with stable data transmission and high reliability;

[0013] The clock module selects a high-precision clock chip to time the main system, with high timing accuracy and small error;

[0014] The display module selects a dot matrix liquid crystal, with a wide operating temperature range, and can display normally at both high and low temperatures, with good stability;

[0015] The power supply and backup power module designs a high-power AC-DC power supply to supply power to the main system, supports AC power failure detection, and the backup power function can ensure the basic functions of the Mengxi intelligent terminal for a certain period of time after the main power fails and powers off;

[0016] The Bluetooth module is the operation, maintenance, and debugging interface of the terminal, and can be locally maintained and debugged with a field debugging terminal;

[0017] The Ethernet module is the uplink communication channel of the terminal. The terminal is equipped with multiple Ethernet ports and can support communication of up to hundreds of megabits of Ethernet;

[0018] The remote signaling module provides multiple monitoring channels for the switch status quantity, real-time monitors the opening and closing status of the line, and has a relatively fast recognition and reporting speed;

[0019] The branch monitoring module is a functional module that works with the Mengxi intelligent terminal to achieve the function of substation area topology identification. This module supports up to 5 outgoing line branches, collects characteristic small current signals through an external current transformer, and forms data packets after certain algorithm operations and stores them in the terminal.

[0020] The control module has 2-way relay control, and the terminal can control tripping and closing in a timely manner according to trigger conditions.

[0021] The AC sampling module is connected to the main control module through the UART interface, the 485 module is connected to the main control module through the USB interface, the wireless public network module is connected to the main control module through the USB interface, the carrier module is connected to the main control module through the USB interface, the clock module is connected to the main control module through the IIC interface, the display module is connected to the main control module through the SPI interface, the power supply and backup power module is connected to the main control module through connecting devices, the Bluetooth module is connected to the main control module through the UART interface, the Ethernet module is connected to the main control module through the USB interface, the telemetry signal module is connected to the main control module through the USB interface, the branch monitoring module is connected to the main control interface through the USB interface, and the control module is connected to the main control module through the USB interface.

[0022] The beneficial technical effects of the present invention: The Mengxi intelligent terminal only needs power line communication. After meeting the basic functions of the power information collection terminal, it can send special fixed-frequency modulation signals to each user meter in turn through this method. After the terminal samples the small current signal, it is transmitted to the branch monitoring module for demodulation and calculation to form a data packet and transmitted to the master station through the uplink communication method, so as to obtain a clear substation area topology structure. The corresponding data obtained by the power grid can be used for the daily maintenance, line detection, fault troubleshooting and other working conditions of the power grid on the low-voltage substation area side. Its data processing is fast and cost-effective, and it can well meet the application requirements of the power grid. Description of the Drawings

[0023] Figure 1 It is the structural framework diagram of the Mengxi intelligent terminal for topology identification;

[0024] Figure 2 It is the topology identification flow chart of the Mengxi intelligent terminal for topology identification; Detailed Embodiments

[0025] In order to enable those skilled in the art to better understand the present invention and make the above objects, features and advantages of the present invention more understandable, the present invention will be further described below with reference to the accompanying drawings. The following content is only used to more clearly illustrate the technical solution of the present invention and cannot be used to limit the protection scope of the present invention.

[0026] Such as Figure 1As shown in the figure, a Mengxi intelligent terminal for topology recognition includes a main control module, an AC sampling module, a carrier module, a 485 module, a wireless public network module, a clock module, a display module, a power supply and backup power module, a Bluetooth module, an Ethernet module, a remote signaling module, a branch monitoring module, and a control module. The main control module is the core of the entire terminal, coordinating the work of each module through various peripheral ports. Its CPU chip has a main frequency greater than 1G and is a multi-core processor, with fast operating speed, large data storage space, and real-time control of functional modules such as the AC sampling module, the carrier module, and the branch monitoring module. The AC sampling module is the AC sampling and metering unit of the terminal, sampling the instantaneous values of voltage and current multiple times, processing the data according to a certain algorithm, and statistically analyzing each data quantity. The 485 module is a functional circuit module. The terminal can communicate with the electric energy meter in a downlink manner through 485 communication. The module uses opto-isolation to ensure the safety and reliability of the system. The wireless public network module is a functional circuit module. The terminal can communicate with the master station in an uplink manner through 4G communication, and this module supports logging in to dual master stations, with stable data transmission and high reliability. The carrier module is a local communication module, using an independently designed broadband carrier chip, with the power line as the carrier signal transmission medium, supporting functions such as substation area or phase differentiation, information active reporting, and automatic networking. The clock module selects a high-precision clock chip to time the main system, with high timing accuracy and small error. The display module selects a dot matrix liquid crystal, with a wide operating temperature range, and can display normally at both high and low temperatures, with good stability. The power supply and backup power module designs a high-power AC-DC power supply to supply power to the main system, supporting AC power failure detection and backup power function. The Bluetooth module is the operation, maintenance, and debugging interface of the terminal, and can be used for local maintenance and debugging with a field debugging terminal. The Ethernet module is the uplink communication channel of the terminal. The terminal is equipped with multiple Ethernet ports, supporting communication of up to hundreds of megabytes. The remote signaling module provides multiple monitoring channels for switch status quantities, real-time monitoring of the opening and closing status of the line, and fast recognition and reporting speed. The branch monitoring module can be used in conjunction with the Mengxi intelligent terminal to achieve the function of substation area topology recognition. This module supports up to 5 outgoing line branches at most, collects characteristic small current signals through an external current transformer, and forms data packets after a certain algorithm operation and stores them in the terminal. The control module has 2-way relay control, and the terminal can control tripping and closing in a timely manner according to trigger conditions.

[0027] The cross-sampling module is connected to the main control module through the UART interface, the 485 module is connected to the main control module through the USB interface, the wireless public network module is connected to the main control module through the USB interface, the carrier module is connected to the main control module through the USB interface, the clock module is connected to the main control module through the IIC interface, the display module is connected to the main control module through the SPI interface, the power supply and backup power module is connected to the main control module through a connecting device, the Bluetooth module is connected to the main control module through the UART interface, the Ethernet module is connected to the main control module through the USB interface, the remote signaling module is connected to the main control module through the USB interface, the branch monitoring module is connected to the main control interface through the USB interface, and the control module is connected to the main control module through the USB interface.

[0028] As Figure 2 shown, a Mengxi intelligent terminal device equipped with a broadband carrier module and a branch monitoring module is installed at the outgoing line of the transformer busbar. An external current transformer is installed on the busbar outgoing line, and an identification device (such as a meter box monitoring unit) is installed on each branch outgoing line of the busbar. The identification device is equipped with a module related to carrier communication, and a single-pass meter is hung under the identification device.

[0029] The topology identification process of the Mengxi intelligent terminal includes feature signal input, feature signal identification, and the main station sorting out the topology relationship. For the feature signal input, after the accurate time calibration of the substation area is completed, the terminal sets the feature signal sending time for all devices (including identification devices and meters) in the substation area file in sequence through the power line carrier communication method of the carrier module according to the start time set by the main station. For the feature signal identification, after the meter receives the carrier signal from the terminal or the identification device, it will send a feature small current signal according to the preset time. This feature small current signal finally converges into the voltage busbar monitored by the Mengxi intelligent terminal through the line branch. The branch monitoring module on the terminal collects this feature small current signal through the external current transformer according to a certain transformation ratio. The Mengxi intelligent terminal can obtain the required information through demodulation and algorithm operations on the acquired signal in the module, and form a data packet related to the topology information, which is stored in the terminal. For the main station sorting out the topology relationship, that is, after the terminal obtains the topology information, it reports it to the main station or is called by the main station for measurement. The main station can then sort out a clear topology identification relationship. When the power supply line relationship changes, the main station can prompt the change of line ownership, and after the user confirms, the topology identification file can be selectively updated. This terminal applies modern digital communication technology, embedded technology, computer software and hardware technology, etc. to realize power metering monitoring and advanced calculation. Especially, it can be used for substation area topology identification, with fast data processing and high cost performance, and can well meet the application requirements of the power grid.

[0030] The above are only the embodiments of the present invention, and do not thereby limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the content of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, shall similarly be included within the patent protection scope of the present invention.

Claims

1. A Mengxi intelligent terminal for topology recognition, characterized in that It includes a main control module, an AC sampling module, a 485 module, a wireless public network module, a carrier module, a clock module, a display module, a power supply and backup power module, a Bluetooth module, an Ethernet module, a remote signaling module, a branch monitoring module, and a control module; The main control module is the core of the terminal as a whole. It coordinates the work of each module through various peripheral ports. Its CPU chip has a main frequency greater than 1G and is a multi-core processor, with fast operating speed, large data storage space, and real-time management and control of functional modules such as the AC sampling module, the carrier module, and the branch monitoring module; The AC sampling module is the AC sampling and metering unit of the terminal. It samples the instantaneous values of voltage and current multiple times, processes the data according to a certain algorithm, and statistics each data quantity; The 485 module is a functional circuit module. The terminal can communicate with the electric energy meter in a downlink manner through 485 communication. The module uses opto-isolation to ensure the safety and reliability of the system; The wireless public network module is a functional circuit module. The terminal can communicate with the master station in an uplink manner through 4G communication, and this module supports logging in to dual master stations, with stable data transmission and high reliability; The carrier module is a local communication module. It uses a self-designed broadband carrier chip and uses the power line as the carrier signal transmission medium, and can support functions such as substation area or phase differentiation, information active reporting, and automatic networking; The clock module selects a high-precision clock chip to time the main system, with high timing accuracy and small error; The display module selects a dot matrix liquid crystal, with a wide operating temperature range, and can be normally displayed at both high and low temperatures, with good stability; The power supply and backup power module designs a high-power AC-DC power supply to supply power to the main system, and supports AC power failure detection and backup power function; The Bluetooth module is the operation, maintenance and debugging interface of the terminal, and can be used for local maintenance and debugging with a field debugging terminal; The Ethernet module is the uplink communication channel of the terminal. The terminal is equipped with multiple Ethernet ports and can support communication of up to hundreds of megabytes; The remote signaling module provides multiple monitoring channels for switch status quantities, real-time monitors the opening and closing status of the line, and has a fast recognition and reporting speed; The branch monitoring module can realize the substation area topology recognition function when used in combination with the Mengxi intelligent terminal. This module supports up to 5 outgoing line branches at most. It collects characteristic small current signals through an external current transformer, and forms data packets after certain algorithm operations and stores them in the terminal; The control module has 2-way relay control, and the terminal can control tripping and closing in a timely manner according to trigger conditions; The AC sampling module is connected to the main control module through the UART interface, the 485 module is connected to the main control module through the USB interface, the wireless public network module is connected to the main control module through the USB interface, the carrier module is connected to the main control module through the USB interface, the clock module is connected to the main control module through the IIC interface, the display module is connected to the main control module through the SPI interface, the power supply and backup power module is connected to the main control module through a connecting device, the Bluetooth module is connected to the main control module through the UART interface, the Ethernet module is connected to the main control module through the USB interface, the remote signaling module is connected to the main control module through the USB interface, the branch monitoring module is connected to the main control interface through the USB interface, and the control module is connected to the main control module through the USB interface.

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