CN115914885A - Digital power distribution station terminal based on Manchester coding communication - Google Patents
Digital power distribution station terminal based on Manchester coding communication Download PDFInfo
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- CN115914885A CN115914885A CN202211525596.8A CN202211525596A CN115914885A CN 115914885 A CN115914885 A CN 115914885A CN 202211525596 A CN202211525596 A CN 202211525596A CN 115914885 A CN115914885 A CN 115914885A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S40/00—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them
- Y04S40/12—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment
- Y04S40/126—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment using wireless data transmission
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Abstract
The invention provides a digital power distribution station terminal based on Manchester coding communication, which is characterized by comprising a digital control module, a digital feeder sensor, a digital voltage sensor, a line loss module, a wireless module and a power supply module, wherein the digital control module is communicated with the digital voltage sensor or the digital feeder sensor through Manchester coding; the invention can not only transmit voltage and current analog quantities, but also support switching quantity and remote control.
Description
Technical Field
The invention relates to the technical field of power equipment, in particular to a digital power distribution station terminal based on Manchester coding communication.
Background
The station terminal (DTU) is generally installed at a conventional switching station, a ring main unit, a box-type substation and the like to acquire and calculate analog quantity and state quantity of switch equipment, and fault positioning, fault isolation and recovery power supply of a sound area of a feeder switch are realized by controlling opening and closing of a switch. The station terminal is used as bottom equipment of the distribution network automation system and plays a significant role in distribution network management work.
At present, the DTU acquires three remote (telemetering, remote signaling and remote control) information, and analog quantity is respectively accessed to a remote signaling and remote control acquisition board and an alternating current sampling board of the DTU from a switch side and a PT/CT side through hard connection. In this way, there are the following disadvantages:
(1) With the increase of the number of the feeder lines, the complexity of wiring and the cost of cables are multiplied;
(2) The DTU has poor expansibility, and because the number of the feeder lines which can be collected by the DTU is fixed, after the terminal is installed and put into operation, the terminal is installed and put into operation at the later stage
(3) It would be very difficult to add a feeder;
(4) When the mutual inductor adopts an electronic type, the small signal is extremely easy to be influenced by an external electromagnetic environment;
(5) When an external communication module is required in the switch cabinet, such as a dehumidifier or a temperature and humidity device, the DTU leads are required to be independently led into the switch cabinet, and the wiring is complicated and disordered.
Disclosure of Invention
The invention aims to provide a digital substation terminal based on Manchester code communication, which solves the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme:
a digital substation terminal based on Manchester coding communication comprises a digital control module, a digital feeder sensor, a digital voltage sensor, a line loss module, a wireless module and a power supply module; the digital control module (DCU) is a core structure of a digital station terminal and is responsible for collecting external sensor data including voltage, current, switch position and the like to complete measurement, control, protection and remote transmission functions; the digital voltage sensor (DPT) completes sampling of the voltage sensor, converts an analog signal into a Manchester code and sends the Manchester code to the DCU; the digital feeder line sensor (DFT) is arranged in the switch and is responsible for collecting current and switch position information in the cabinet, communicating with the communication equipment, converting all analog information into Manchester codes, transmitting the Manchester codes to the DCU, receiving the Manchester codes from the DCU, and realizing control of the switch and data interaction of the communication equipment; the power supply module supplies power to the whole digital DTU (station terminal) to ensure the reliable operation of the device; the line loss module receives the Manchester code of the coder-decoder, decodes and extracts alternating current sampling information, realizes the electric measurement calculation work of alternating current data, and uploads the electric measurement data to the core processor; the wireless module provides a data channel for the data interaction between the core processor and the power distribution master station; the DCU is communicated with the DPT or the DFT through Manchester coding, a coding and decoding demodulator of the DCU completes coding and decoding tasks of Manchester codes, the core processor completes data analysis and processing tasks, receives line loss data of the line loss module, and performs data interaction with the power distribution master station through the wireless module.
The DTU mainly comprises a core processor, a field programmable gate array and an RS485 module, wherein:
(1) The RS485 module finishes the work of receiving and sending digital quantity, and each path of DPT/DFT is connected to one path of RS485 module;
(2) The field programmable gate array finishes the coding and decoding and grouping processing work of multi-channel digital signals, performs data interaction with the core processor through a bus, and simultaneously forwards feeder line voltage/current data to a line loss module;
(3) The core processor and the field programmable gate array perform data interaction through a bus, wherein voltage/current data are subjected to measurement calculation, wave recording storage and protection actions, and if protection export conditions are met, remote control data are issued to corresponding SDUs; carrying out event sequence recording processing on the remote signaling data; and carrying out corresponding protocol processing on the serial port data.
The digital voltage sensor DPT is arranged on a PT cabinet (PT: potential transformer), and is used for conditioning a secondary side voltage signal converted by a primary voltage transformer, converting an analog quantity into a digital quantity by AD conversion and then entering a field programmable gate array.
The DFT is arranged in a switch cabinet, primary equipment including a load switch/breaker, a current sensor, various communication modules and the like is arranged in the switch cabinet, a field programmable gate array accesses data of different sensors, decodes the data, uploads the decoded data to a DCU, receives the data of the DCU at the same time, and completes remote control operation and interaction with the communication modules after decoding the data; the DFT power supply is respectively provided for remote signaling, remote control and field programmable gate array, and the three groups of power supplies are isolated from each other and do not influence each other.
In the data interaction process, a DCU in a digital DTU is taken as a main part, a DPT/DFT is taken as a secondary part, namely, each time of interaction is realized, a starting signal is sent by the DCU, the DPT/DFT starts AD conversion after receiving a starting frame, meanwhile, the DPT/DFT also collects data of a communication module and switch position data, and after the conversion is finished, sampling data is packed and coded and sent to the DCU; the DCU receives the data to perform corresponding function processing, and transmits the processing data interacted by the remote control operation and communication module to the DPT/DFT, thus completing a group of data interaction.
Compared with the prior art, the invention has the following beneficial effects:
(1) The voltage, the current, the switching value and other signals are sampled in the ring main unit on site, and a field programmable gate array scheme is adopted, so that the reliability of hardware is high, the system design is simplified, the later-stage capacity expansion is facilitated, the wiring is facilitated, and the cost is saved;
(2) The communication adopts Manchester encoding, the transmission speed is high, the data volume is large, and the anti-interference performance is high;
(3) In the prior art, a high-voltage protection channel only transmits analog quantities such as voltage and current at present, but the invention supports switching value and remote control;
(4) The digital power distribution terminal based on Manchester encoding can realize synchronous sampling and can realize the differential protection function of the power distribution terminal.
Drawings
FIG. 1 is a block diagram of the system of the present invention;
FIG. 2 is a hardware block diagram of a DCU according to the present invention;
FIG. 3 is a hardware block diagram of the DPT/DFT of the present invention;
FIG. 4 is a detailed flow chart of data interaction according to the present invention.
Detailed Description
The present invention will be described in further detail with reference to the following examples in order to clarify technical problems, technical solutions, implementation processes and performance displays. It should be understood that the specific embodiments described herein are for illustrative purposes only. The present invention is not limited to the above embodiments. Various exemplary embodiments, features and aspects of the present disclosure will be described in detail below with reference to the accompanying drawings. In the drawings, like reference numbers can indicate functionally identical or similar elements. While the various aspects of the embodiments are presented in drawings, the drawings are not necessarily drawn to scale unless specifically indicated.
The word "exemplary" is used exclusively herein to mean "serving as an example, embodiment, or illustration. Any embodiment described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments.
Furthermore, in the following detailed description, numerous specific details are set forth in order to provide a better understanding of the present disclosure. It will be understood by those skilled in the art that the present disclosure may be practiced without some of these specific details. In some instances, methods, means, elements and circuits that are well known to those skilled in the art have not been described in detail so as not to obscure the present disclosure.
Example 1
As shown in fig. 1, a digital substation terminal based on manchester coding communication is characterized by comprising a digital control module, a digital feeder line sensor, a digital voltage sensor, a line loss module, a wireless module and a power supply module; the digital control module (DCU) is a core structure of a digital station terminal and is responsible for collecting external sensor data including voltage, current, switch position and the like to complete measurement, control, protection and remote transmission functions; the digital voltage sensor (DPT) completes sampling of the voltage sensor, converts an analog signal into a Manchester code and sends the Manchester code to the DCU; the digital feeder line sensor (DFT) is arranged in the switch and is responsible for collecting current and switch position information in the cabinet, communicating with the communication equipment, converting all analog information into Manchester codes, transmitting the Manchester codes to the DCU, receiving the Manchester codes from the DCU, and realizing control of the switch and data interaction of the communication equipment; the power supply module supplies power to the whole digital DTU (station terminal) to ensure the reliable operation of the device; the line loss module receives the Manchester codes of the coder-decoder, decodes and extracts alternating current sampling information, realizes the electric measurement calculation work of alternating current data, and uploads the electric measurement data to the core processor; the wireless module provides a data channel for data interaction between the core processor and the power distribution master station; the DCU and the DPT or DFT are communicated through Manchester coding, a coding and decoding device of the DCU completes coding and decoding tasks of Manchester codes, a core processor completes data analysis and processing tasks, receives line loss data of a line loss module, and performs data interaction with a power distribution main station through a wireless module.
The design scheme is different from the traditional centralized sampling processing scheme, and adopts layered processing, the feeder equipment is regarded as a sensor node, and all nodes adopt Manchester coding to perform data interaction with a DCU. The data transmission adopts an RS-485 full duplex interface, the transmission physical layer adopts a copper wire type shielded cable for transmission, and one feeder line needs 6 wires to be connected with a DCU (direct current unit), namely, positive/negative power supply, positive/negative digital quantity transmission and positive/negative digital quantity receiving, so that the wiring is greatly simplified, and the later-stage capacity expansion and maintenance are facilitated.
As shown in fig. 2, the DTU mainly comprises a core processor, a field programmable gate array, and an RS485 module, wherein:
(1) The RS485 module completes the work of receiving and sending digital quantity, and each path of DPT/DFT is connected to one path of RS485 module;
(2) The field programmable gate array finishes the coding and decoding and grouping processing work of multi-channel digital signals, performs data interaction with the core processor through a bus, and simultaneously forwards feeder line voltage/current data to a line loss module;
(3) The core processor and the field programmable gate array perform data interaction through a bus, wherein voltage/current data are subjected to measurement calculation, wave recording storage and protection actions, and if protection export conditions are met, remote control data are issued to corresponding SDUs; carrying out event sequence recording processing on the remote signaling data; and carrying out corresponding protocol processing on the serial port data.
As shown in fig. 3, the digital voltage sensor DPT is installed in a PT cabinet, and performs signal conditioning on a secondary-side voltage signal converted by a primary voltage transformer, and then converts the analog value into a digital value through AD conversion, and then enters a field programmable gate array.
The DFT is arranged in a switch cabinet, primary equipment in the cabinet comprises a load switch/a breaker, a current sensor, various communication modules and the like, a field programmable gate array accesses data of different sensors, decodes the data, uploads the decoded data to the DCU, receives the data of the DCU at the same time, and completes remote control operation and interaction with the communication modules after decoding the data; the DFT power supply is respectively provided for remote signaling, remote control and field programmable gate array, and the three groups of power supplies are isolated from each other and do not influence each other.
The specific flow is shown in fig. 4: in the data interaction process, a DCU in a digital DTU is taken as a main part, a DPT/DFT is taken as a secondary part, namely, each time of interaction is realized, a starting signal is sent by the DCU, the DPT/DFT starts AD conversion after receiving a starting frame, meanwhile, the DPT/DFT also collects data of a communication module and switch position data, and after the conversion is finished, sampling data is packed and coded and sent to the DCU; the DCU receives the data to perform corresponding function processing, and transmits the processing data interacted by the remote control operation and the communication module to the DPT/DFT, thus finishing a group of data interaction.
The foregoing shows and describes the general principles, principal features, and advantages of the invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments, and the above embodiments and descriptions are only preferred examples of the present invention and are not intended to limit the present invention, and that various changes and modifications may be made without departing from the spirit and scope of the present invention, which fall within the scope of the claimed invention. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (5)
1. A digital substation terminal based on Manchester coding communication is characterized by comprising a digital control module, a digital feeder sensor, a digital voltage sensor, a line loss module, a wireless module and a power supply module; the Digital Control Unit (DCU) is a core structure of a digital station terminal, and is responsible for collecting external sensor data including voltage, current, switch position and the like to complete measurement, control, protection and remote transmission functions; the digital voltage sensor (DPT) completes sampling of the voltage sensor, converts an analog signal into a Manchester code and sends the Manchester code to the DCU; the digital feeder sensor (DFT) is arranged in the switch and is responsible for collecting current and switch position information in the cabinet, communicating with the communication equipment, converting all analog information into Manchester codes, transmitting the Manchester codes to the DCU, receiving the Manchester codes from the DCU, and realizing control of the switch and data interaction of the communication equipment; the power supply module supplies power to the whole digital DTU (station terminal) to ensure the reliable operation of the device; the line loss module receives the Manchester codes of the coder-decoder, decodes and extracts alternating current sampling information, realizes the electric measurement calculation work of alternating current data, and uploads the electric measurement data to the core processor; the wireless module provides a data channel for the data interaction between the core processor and the power distribution master station; the DCU and the DPT or DFT are communicated through Manchester coding, a coding and decoding device of the DCU completes coding and decoding tasks of Manchester codes, a core processor completes data analysis and processing tasks, receives line loss data of a line loss module, and performs data interaction with a power distribution main station through a wireless module.
2. The digital substation terminal based on manchester code communication of claim 1, wherein the DTU is mainly composed of a core processor, a field programmable gate array and an RS485 module, wherein:
(1) The RS485 module completes the work of receiving and sending digital quantity, and each path of DPT/DFT is connected to one path of RS485 module;
(2) The field programmable gate array finishes the coding and decoding and grouping processing work of multi-channel digital signals, performs data interaction with the core processor through a bus, and simultaneously forwards feeder line voltage/current data to a line loss module;
(3) The core processor and the field programmable gate array perform data interaction through a bus, wherein voltage/current data are subjected to measurement calculation, wave recording storage and protection actions, and if protection export conditions are met, remote control data are issued to corresponding SDUs; carrying out event sequence recording processing on remote signaling data; and carrying out corresponding protocol processing on the serial port data.
3. The terminal of claim 1, wherein the DPT is installed in a PT cabinet (Potential transformer), and the DPT performs signal conditioning on a secondary side voltage signal converted by the primary transformer, and then enters a field programmable gate array after being converted from an analog quantity to a digital quantity by AD conversion.
4. The terminal of the digital distribution substation based on Manchester coding communication of claim 1, wherein the DFT is installed in a switch cabinet, primary equipment including a load switch/breaker, a current sensor and various communication modules are arranged in the switch cabinet, a field programmable gate array accesses data of different sensors, decodes the data, uploads the decoded data to a DCU, receives data of the DCU, and completes remote control operation and interaction with the communication modules after decoding the data; the DFT power supply is respectively provided for remote signaling, remote control and field programmable gate array, and the three groups of power supplies are isolated from each other and do not influence each other.
5. The terminal of claim 1, wherein in the data interaction process, a DCU in a digital DTU is a master, and a DPT/DFT is a slave, that is, each interaction is performed by sending a start signal from the DCU, the DPT/DFT starts AD conversion after receiving a start frame, and simultaneously collects data of a communication module and data of a switch position, and after the conversion is finished, sends sampling data to the DCU in a packet coding manner; the DCU receives the data to perform corresponding function processing, and transmits the processing data interacted by the remote control operation and the communication module to the DPT/DFT, thus finishing a group of data interaction.
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