Automatic sorting sensor terminal, background terminal, system and method for distribution network topology

Abstract

The present invention provides a sensor terminal, a background terminal, a system and a method for automatically sorting the topology of a distribution network. The sensor terminal includes: a current signal induction coil for collecting the positive zero-crossing time information and current amplitude information of the alternating current signal on the distribution network at the installation site; a GNSS module for obtaining the time reference information and geographical location information of the sensor terminal for automatically sorting the topology of the distribution network; a single-chip microcomputer that obtains the time reference information and geographical location information obtained by the GNSS module through the connection with the GNSS module; and obtains the positive zero-crossing time information and current amplitude information of the current signal through the connection with the current signal induction coil. The sensor terminal, background terminal, system and method for automatically sorting the topology of the distribution network provided by the present invention accurately and efficiently complete the automatic sorting of each line of the distribution network, and automatically obtain the substation, bus and outgoing line to which each line belongs.

Description

Technical Field

[0001] The present invention relates to the technical field of distribution network automation, and particularly to a sensor terminal, a background terminal, a system and a method for automatic sorting of a distribution network topology. Background Art

[0002] The topology sorting of a distribution network is to mark the substation to which each outgoing line of each substation belongs, the bus to which it belongs, and the outgoing line to which it belongs on the distribution network topology diagram. The topology sorting of a distribution network is divided into an offline manual method and an online automatic generation method.

[0003] The manual method refers to manually measuring and querying the longitude and latitude, the substation to which it belongs, the bus to which it belongs, and the outgoing line to which it belongs at key points of each line, and marking them on the distribution network topology diagram. The automatic generation method refers to installing a sensor terminal at key points of each line. The sensor collects the line current and the longitude and latitude of this point, and transmits the information to the background terminal. The background terminal calculates the topology sorting of the distribution network through an algorithm.

[0004] When using the manual method for sorting, the operation efficiency is low. If the automatic generation method is adopted, there is generally a problem that it is difficult to determine the substation and bus belonging of the sensor terminal, which has an adverse effect on the efficiency of automatic sorting. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a sensor terminal, a background terminal, a system and a method for automatic sorting of a distribution network topology, which can accurately and efficiently complete the sorting of the distribution network sensing terminal.

[0006] To solve the above technical problem, the present invention provides a sensor terminal for automatic sorting of a distribution network topology. The sensor terminal includes: a current signal induction coil for collecting the positive zero-crossing time information and current amplitude information of the alternating current signal on the distribution network at the installation site; a GNSS module for obtaining the time reference information and geographical location information of the sensor terminal for automatic sorting of the distribution network topology; a single-chip microcomputer connected to the current signal induction coil and the GNSS module, obtaining the time reference information and geographical location obtained by the GNSS module through the connection with the GNSS module; obtaining the positive zero-crossing time information and current amplitude information of the current signal through the connection with the current signal induction coil; obtaining the timing phase information of the current signal by comparing the positive zero-crossing time with the time reference; obtaining the substation to which the line belongs, the bus to which it belongs, and the outgoing line to which it belongs through the timing phase information and the current amplitude information. A communication module is connected to the single-chip microcomputer and transmits the timing phase information, the current amplitude information and the geographical location information to the background terminal for automatic sorting of the distribution network topology.

[0007] In some embodiments, the communication module includes: a wireless communication module, or a mobile GPRS module.

[0008] In some embodiments, the wireless communication module is used for the self-organizing network communication between different automatically sorted sensor terminals of the distribution network topology in a scenario where the distance between different sensor terminals is less than 100 meters.

[0009] In some embodiments, the self-organizing network differentiates different line-attributed substations, attributed buses, and attributed outgoing lines through frequency-division channels.

[0010] In some embodiments, the mobile GPRS module is used for data communication with the background terminal of the automatically sorted distribution network topology in a scenario where the distance between different automatically sorted sensor terminals of the distribution network topology is greater than 100 meters.

[0011] In some embodiments, the single-chip microcomputer determines the timing phase information of the AC current signal on the line through the 1PPS signal.

[0012] In some embodiments, the 1PPS signal is transmitted from the GNSS module to the single-chip microcomputer.

[0013] In some embodiments, it further includes: an energy extraction coil, which is used to extract electrical energy from the line and use the extracted electrical energy to supplement the electrical energy of the lithium battery.

[0014] In addition, the present invention also provides a background terminal for automatically sorting the distribution network topology. The background terminal includes: a background mobile GPRS module, which acquires the timing phase information, current amplitude information, and geographical location information uploaded by the automatically sorted sensor terminals of the distribution network topology, and determines the attributed substation, attributed bus, and attributed outgoing line of the automatically sorted sensor terminal of the distribution network topology according to the timing phase information, current amplitude information, and geographical location information of each automatically sorted sensor terminal of the distribution network topology; a server, which is connected to the mobile GPRS module and automatically sorts each automatically sorted sensor terminal of the distribution network topology according to the attributed substation, attributed bus, and attributed outgoing line of each automatically sorted sensor terminal of the distribution network topology.

[0015] In addition, the present invention also provides a system for automatically sorting the distribution network topology. The system includes: a plurality of automatically sorted sensor terminals of the distribution network topology according to the foregoing, and at least one background terminal for automatically sorting the distribution network topology according to the foregoing.

[0016] In addition, the present invention also provides a method for automatically sorting the distribution network topology. The method includes: collecting the timing phase information and current amplitude information of the AC current signal on the distribution network at the installation site; acquiring the geographical location information of the automatically sorted sensor terminal of the distribution network topology; and transmitting the timing phase information, current amplitude information, and geographical location information to the background terminal for automatically sorting the distribution network topology.

[0017] After adopting such a design, the present invention has at least the following advantages:

[0018] The present invention can obtain the timing phase information, current amplitude information of the alternating current signal on the line in real time online, as well as the geographical location information of the sensing terminal, and then comprehensively judge the substation to which each sensor belongs, the bus to which it belongs, and the outgoing line to which it belongs according to the above-mentioned timing phase information, current amplitude information and geographical location information, so as to automatically generate the topological sorting of the distribution network, improve the accuracy of the topological sorting, and reduce the manual work intensity. Brief Description of the Drawings

[0019] The above is only an overview of the technical solution of the present invention. In order to understand the technical means of the present invention more clearly, the following further describes the present invention in detail in conjunction with the drawings and specific embodiments.

[0020] Figure 1 is a schematic diagram of the principle of the sensor terminal provided by the embodiment of the present invention;

[0021] Figure 2 is a schematic diagram of the principle of the current sampling value and timing phase provided by the embodiment of the present invention;

[0022] Figure 3 is a schematic diagram of the principle of the background terminal provided by the embodiment of the present invention.

[0023] Description of the reference numerals:

[0024] 1 Energy extraction coil 2 Power supply extraction module

[0025] 3 Lithium battery 4 Current signal induction coil

[0026] 5 Single-chip microcomputer 6 Wireless communication module

[0027] 7 Sensing end mobile GPRS module 8 GNSS module

[0028] 11 Server 12 Background end mobile GPRS module Specific Embodiments

[0029] The following describes the preferred embodiments of the present invention with reference to the drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0030] The purpose of the present invention is to automatically generate the topological sorting of the distribution network, that is, to automatically mark the substation to which the line belongs, the bus to which it belongs, and the outgoing line to which it belongs on all lines of the distribution network. When the lines increase or decrease, the topological sorting can also be automatically changed.

[0031] The present invention includes two parts: a sensor terminal and a background terminal. The sensor terminal is installed at the key points of the line, that is, the branch points, the beginning and the end of the line. The structure of the sensor terminal is as Figure 1as shown

[0032] See Figure 1 , the energy extraction coil 1 is an iron-based nanocrystalline core coil with 100 turns, and its function is to extract energy from the power line current.

[0033] The power extraction module 2 extracts energy from the energy extraction coil 1 and charges the battery 3.

[0034] The lithium battery 3 is of the 18650 model with a rated supply voltage of 3.7V.

[0035] The current signal induction coil 4 is an iron-based nanocrystalline core coil with 1200 turns and is used as a current transformer to sample the current in the power line.

[0036] The single-chip microcomputer 5 is a single-chip microcomputer with a dual serial port 12-bit AD. The external interrupt source of the single-chip microcomputer is connected to the 1PPS signal of the GNSS module 8 to receive the second pulse. The TXD, RXD, and GND of one serial port are connected to the GNSS module 8 to receive the longitude and latitude of this sensor point. The TXD, RXD, and GND of the other serial port are connected in parallel to the mobile GPRS module 7 and the wireless communication module 6. The mobile GPRS module 7 and the wireless communication module 6 are selected one by one, and only one module can work at the same time. When the sensor installation density is large and the distance is far, the mobile GPRS module 7 is used. When the sensor installation density is small and the distance is close, the wireless communication module 6 is used. The single-chip microcomputer 5 sends the current sampling value and the timing phase to the background terminal regularly. The information sent is as Figure 2 as shown

[0037] The wireless communication module 6 uses a wireless ad hoc network module and communicates with the background terminal in a relay manner.

[0038] The mobile GPRS module 7 realizes communication with the background terminal. When the sensor installation density is large and the distance is far, the mobile GPRS module 7 is used. When the sensor installation density is small and the distance is close, the wireless communication module 6 is used.

[0039] The GNSS module 8 outputs 1PPS to the single-chip microcomputer 5 for calculating the phase between 1PPS and the power line current. It sends the longitude and latitude of this sensor point to the single-chip microcomputer.

[0040] The structure of the background terminal is as Figure 3 shown. See Figure 3 ,

[0041] The server 11 completes data collection and topological sorting algorithms. TXD, RXD, and GND are connected to the background terminal mobile GPRS module 12.

[0042] The mobile GPRS module 12 completes communication with the sensor terminal.

[0043] It should be emphasized that the timing phase is the key to the present invention. With the timing phase, the vector sum of branch currents can be calculated, and the substation, busbar, and outgoing line to which each line belongs can be determined.

[0044] The frequency-division channel is the key to the present invention. With the frequency-division channel, a self-organizing network is formed between the upper and lower routes of the unified frequency, which is independent of the communication systems of nearby outgoing line channels and does not interfere with each other, making it possible to self-verify and manage the current phase and vector information of each branch node in each block.

[0045] The whole network synchronously samples under the control of 1PPS. The 1PPS signal is a second pulse signal. The characteristic of this signal is that its period is one second, that is, there is a pulse per second, and it is used to determine the timing phase in the technical solution of the present invention.

[0046] The above are only the preferred embodiments of the present invention, and do not impose any form of limitation on the present invention. Any simple modifications, equivalent changes, or decorations made by those skilled in the art using the disclosed technical content fall within the protection scope of the present invention.

Claims

1. An automatic sorting sensor terminal for a distribution network topology, characterized in that, Comprising: A current signal induction coil for collecting the positive zero-crossing time information and current amplitude information of the alternating current signal on the distribution network at the installation site; A GNSS module for obtaining the time reference information and geographical location information of the sensor terminal for automatic sorting of the distribution network topology; A single-chip microcomputer connected to the current signal induction coil and the GNSS module, and obtaining the time reference information and geographical location information obtained by the GNSS module through the connection with the GNSS module; Obtaining the positive zero-crossing time information and current amplitude information of the current signal through the connection with the current signal induction coil; Obtaining the timing phase information of the current signal by comparing the positive zero-crossing time with the time reference; calculating the vector sum of branch currents through the timing phase information and current amplitude information, and obtaining the substation, busbar and outgoing line to which each line belongs; The single-chip microcomputer determines the timing phase information of the alternating current signal on the line through the 1PPS signal; A communication module connected to the single-chip microcomputer, and transmitting the timing phase information, current amplitude information and geographical location information to the background terminal for automatic sorting of the distribution network topology; An energy extraction coil for extracting electric energy from the line and using the extracted electric energy to supplement the electric energy of the lithium battery.

2. The automatic sorting sensor terminal for a distribution network topology according to claim 1, characterized in that, The communication module includes: a wireless ad hoc network communication module, or a mobile GPRS module.

3. The automatic sorting sensor terminal for a distribution network topology according to claim 2, characterized in that, The wireless communication module is used for self-organizing network communication between different sensor terminals for automatic sorting of the distribution network topology in the scenario where the distance between different sensor terminals is less than 100 meters.

4. The automatic sorting sensor terminal for a distribution network topology according to claim 3, characterized in that, The ad hoc network distinguishes the substation, busbar and outgoing line to which each line belongs through the frequency division channel method.

5. The automatic sorting sensor terminal for a distribution network topology according to claim 2, characterized in that, The mobile GPRS module is used for data communication with the background terminal for automatic sorting of the distribution network topology in the scenario where the distance between different sensor terminals for automatic sorting of the distribution network topology is greater than 100 meters.

6. The automatic sorting sensor terminal for a distribution network topology according to claim 1, characterized in that, The 1PPS signal is transmitted from the GNSS module to the single-chip microcomputer.

7. An automatic sorting background terminal for a distribution network topology, characterized in that, Comprising: A background mobile GPRS module, obtaining the timing phase information, current amplitude information and geographical location information uploaded by the sensor terminal for automatic sorting of the distribution network topology according to any one of claims 1 to 6, and judging the substation, busbar and outgoing line to which the sensor terminal for automatic sorting of the distribution network topology belongs according to the timing phase information, current amplitude information and geographical location information of each sensor terminal for automatic sorting of the distribution network topology; A server connected to the mobile GPRS module, and automatically sorting each sensor terminal for automatic sorting of the distribution network topology according to the timing phase information, current amplitude information and geographical location information of each sensor terminal for automatic sorting of the distribution network topology.

8. A distribution network topology automatic sorting system, characterized in that, Comprising: A plurality of sensor terminals for automatic sorting of the distribution network topology according to any one of claims 1 to 6, and at least one background terminal for automatic sorting of the distribution network topology according to claim 7.

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