Integrated topology identification method for medium and low voltage distribution network, and related master station and secondary terminal

Abstract

The application provides a kind of medium and low voltage distribution network integrated topology identification method and related master station and secondary terminal, and secondary terminal integrates power line sensing module;Power line sensing module collects power frequency distortion signal and power line signal;Secondary terminal identifies the connection relationship between the primary equipment corresponding to the secondary terminal in distribution network based on power frequency distortion signal, and sends the identification result and power line signal to master station;Master station identifies the state of primary equipment and the state of adjacent primary equipment based on the received identification result and power line signal.The application can simultaneously identify medium voltage distribution network topology and low voltage distribution network topology through the interaction of power line sensing module and master station, and the topology data of medium voltage distribution network and low voltage distribution network can be spliced, without topology information island, realizing integrated topology identification of whole network, and improving the reliability and accuracy of identification, reducing the identification cost.

Description

Technical Field

[0001] This invention relates to the field of power distribution network technology, specifically to an integrated topology identification method for medium and low voltage power distribution networks and related master stations and secondary terminals. Background Technology

[0002] Distribution networks are crucial infrastructure supporting economic and social development. They primarily consist of medium-voltage and low-voltage distribution networks. Medium-voltage distribution networks utilize voltage levels such as 20kV, 10kV, and 6kV, while low-voltage distribution networks are mainly at 400V. Medium-voltage distribution networks connect to low-voltage distribution networks via distribution transformers. The primary network of a distribution network includes overhead lines, cable lines, and mixed lines. Key nodes on the network include substations connected to the transmission network, various distribution switches, ring main units, switching stations, transformers, low-voltage branch boxes, and user access points (electricity meters). Medium and low-voltage distribution networks are large in scale, numerous in points, and widely distributed, making equipment and network data maintenance and management complex. For many years, power company maintenance personnel have regularly and irregularly collected, organized, and entered distribution network topology data. However, the collection and organization of medium and low-voltage line and facility data still faces challenges such as large data volumes and heavy workloads. Furthermore, relying on manual statistical analysis makes it difficult to guarantee data quality and timely updates. Therefore, research on automatic topology identification technology and its application in distribution networks is of great significance for the efficient and reliable operation and maintenance of distribution networks.

[0003] Currently, the operation and management of power distribution networks involve multiple automation and information systems. One of the main functions of the energy management system (EMS) is to monitor the operating status of the first switch at the feeder outlet of a substation. One function of the distribution automation system (DAS) is to identify the status of distribution network switches and network connections for distribution network state estimation and power flow calculation. The product management system (PMS) needs to track the topological relationships of distribution switches and transformers in real time, providing a basis for equipment maintenance, fault / defect / anomaly analysis, and asset ledger management. If an integrated automatic topology identification method and system for medium- and low-voltage power distribution networks is adopted to automatically identify the topology of medium- and low-voltage power distribution networks (including the "station-line-transformer-customer" relationships and topological connections), and provide common interface data for these business application systems, it will be of medium-voltage significance for the integration of operation, distribution, and dispatching services.

[0004] Existing methods for identifying distribution network topology include: 1) Identifying distribution network topology based on GPS positioning, with separate identification for medium-voltage and low-voltage distribution network topologies. This means that it cannot identify medium-voltage and low-voltage distribution network topologies simultaneously, and the topology data of the two networks cannot be stitched together, resulting in isolated topology information and preventing full network topology identification; 2) Identifying distribution network topology based on GPRS positioning, BeiDou navigation positioning, or long-term data accumulation methods, which have low reliability; 3) Identifying distribution network topology based on impedance or admittance measurement methods, which have low accuracy and high cost. Summary of the Invention

[0005] To overcome the shortcomings of existing technologies, such as the inability to achieve full network topology identification, low identification reliability, low accuracy, and high cost, this invention provides an integrated topology identification method for medium and low voltage distribution networks, along with related master stations and secondary terminals, including:

[0006] The secondary terminal uses a power line sensing module integrated inside the secondary terminal of the distribution network to collect power frequency distortion signals and power line signals;

[0007] The secondary terminal identifies the connection relationship between the primary equipment corresponding to the secondary terminal in the distribution network based on the power frequency distortion signal;

[0008] The secondary terminal sends the identification results and power line signals to the main station.

[0009] The secondary terminal identifies the connection relationship between the primary equipment corresponding to the secondary terminal in the distribution network based on the power frequency distortion signal, including:

[0010] The secondary terminal obtains the connection relationship identification command issued by the main station;

[0011] Based on the connection relationship identification command, the secondary terminal requests the master station to send information on all secondary terminals on the feeder of the substation connected to the dispatch monitoring switch terminal;

[0012] The secondary terminal obtains information from the main station regarding all secondary terminals belonging to the main station;

[0013] The secondary terminal determines the feeder where the secondary terminal is located based on the information sent by the master station and the power frequency distortion signal fed back by the power frequency distortion signal modulation and demodulation channel. It also measures the distance between the secondary terminal and all secondary terminals on the feeder where the secondary terminal is located through the high frequency power line signal modulation and demodulation channel.

[0014] The secondary terminal determines the connection relationship between the primary devices corresponding to the secondary terminal based on the distance.

[0015] The secondary terminal can be any one of the following: feeder terminal unit, station terminal unit, transformer terminal unit, low-voltage terminal unit, smart energy meter, and indicator.

[0016] The secondary terminal uses a power line sensing module integrated within the secondary terminal of the distribution network to collect power frequency distortion signals and power line signals, including:

[0017] The fundamental wave power line signal and the low frequency power line signal are acquired using the high frequency power line signal modulation and demodulation channel of the power line sensing module.

[0018] Power frequency distortion signals are acquired using the power frequency distortion signal modulation and demodulation channel of the power line sensing module;

[0019] The power line sensing module includes: a high-frequency power line signal modulation and demodulation channel, a wideband power line signal acquisition channel, and a power frequency distortion signal modulation and demodulation channel.

[0020] The power line signal includes fundamental power line signal and low-frequency power line signal.

[0021] On the other hand, the present invention also provides a secondary terminal, characterized in that it includes:

[0022] The power line sensing module, integrated inside the secondary terminal of the power distribution network, is used to collect power frequency distortion signals and power line signals.

[0023] The connection relationship identification module is used to identify the connection relationship between primary devices corresponding to secondary terminals in the power distribution network based on the power frequency distortion signal.

[0024] The transmitting module is used by the secondary terminal to send the identification results and power line signals to the master station.

[0025] Furthermore, the present invention also provides an integrated topology identification method for medium and low voltage distribution networks, comprising:

[0026] The main station receives the identification results and power line signals sent by the secondary terminal;

[0027] The master station identifies the status of primary equipment and the status of lines between adjacent primary equipment based on the received identification results and power line signals;

[0028] The identification result represents the connection relationship between the secondary terminal and the corresponding primary device.

[0029] The master station identifies the status of primary equipment and the status of lines between adjacent primary equipment based on the received identification results and power line signals, including:

[0030] The main station identifies the status of all primary equipment based on the broadband power line signal in the power line signal, the fundamental power line signal collected by the secondary terminal, and the low-frequency power line signal in the power line signal.

[0031] The main station identifies the status of the lines between adjacent primary devices based on the high-frequency power line signals collected by the power line sensing module.

[0032] Power line signals include broadband power line signals and low-frequency power line signals.

[0033] The broadband power line signal includes a broadband power line voltage signal and a broadband power line current signal;

[0034] The highest frequency of both the broadband power line voltage signal and the broadband power line current signal is not less than 30MHz;

[0035] The fundamental power line signal includes fundamental voltage and fundamental current;

[0036] The low-frequency power line signal includes low-frequency voltage and low-frequency current;

[0037] The frequencies of both the low-frequency voltage and the low-frequency current are no higher than 2.5 kHz.

[0038] The main station identifies the status of all primary equipment based on the broadband power line signal collected by the power line sensor module and the fundamental and low-frequency power line signals collected by the secondary terminals, including:

[0039] When the broadband power line signal, the fundamental power line signal, and the low-frequency power line signal are all within their respective preset amplitude ranges, the master station determines that the primary equipment is in a normal state; otherwise, the master station determines that the primary equipment is in a fault state.

[0040] The main station identifies the status of the lines between adjacent primary devices based on the high-frequency power line signals collected by the power line sensing module, including:

[0041] The master station controls the power line sensing module located at one end of the line to send a high-frequency power line signal to the power line sensing module located at the other end of the line through a high-frequency power line signal modulation and demodulation channel. At the same time, the master station controls the power line sensing module located at the other end of the line to receive the high-frequency power line signal through the high-frequency power line signal modulation and demodulation channel. When the power line sensing module located at the other end of the line receives the high-frequency power line signal and the strength of the received high-frequency power line signal is greater than a preset signal strength threshold, the master station determines that the line between adjacent primary devices is in a normal state; otherwise, the master station determines that the line between adjacent primary devices is in a fault state.

[0042] The main station identifies the status of the lines between adjacent primary devices based on the high-frequency power line signals collected by the power line sensing module, and then includes:

[0043] When both the primary device and the line between adjacent primary devices are in normal condition, the master station updates the original status of the primary device and the status of the line between adjacent primary devices based on the identified status of the primary device and the status of the line between adjacent primary devices.

[0044] When both the primary device and the adjacent primary device are in a fault state, or when any of the primary devices and the adjacent primary devices are in a fault state, the master station reissues the connection relationship identification command to the dispatch monitoring switch terminal based on the identified status of the primary device and the status of the adjacent primary devices, so that the dispatch monitoring switch terminal can re-identify the connection relationship between the status of the primary device and the status of the adjacent primary devices.

[0045] The high-frequency power line signals include narrowband power line signals of 10kHz to 500kHz and broadband power line signals of 1MHz to 30MHz.

[0046] The secondary terminal is any one of the following: feeder terminal unit, station terminal unit, transformer terminal unit, low-voltage terminal unit, smart energy meter, and indicator.

[0047] Furthermore, the present invention also provides a main station, comprising:

[0048] The receiving module is used to receive the identification results and power line signals sent by the secondary terminal;

[0049] The status recognition module is used to identify the status of primary equipment and the status of lines between adjacent primary equipment based on the received recognition results and power line signals.

[0050] The technical solution provided by this invention has the following beneficial effects:

[0051] In the integrated topology identification method for medium and low voltage distribution networks provided by this invention, the secondary terminal uses a power line sensing module integrated inside the secondary terminal in the distribution network to collect power frequency distortion signals and power line signals. The secondary terminal identifies the connection relationship between the primary devices corresponding to the secondary terminal in the distribution network based on the power frequency distortion signals, and sends the identification results and power line signals to the master station. The master station identifies the status of the primary devices and the status of the lines between adjacent primary devices based on the received identification results and power line signals. The integrated topology identification of medium and low voltage networks is realized through the interaction between the secondary terminal with integrated power line sensing module and the master station, which improves the reliability and accuracy of identification and reduces the identification cost.

[0052] The secondary terminal in this invention identifies the connection relationships between nodes and lines in medium and low voltage distribution networks through the power frequency distortion signal modulation and demodulation channel and the high frequency power line signal modulation and demodulation channel of the power line sensing module. It also identifies the line status through the high frequency power line signal modulation and demodulation channel of the power line sensing module and identifies the node status through the broadband power line signal modulation and demodulation channel. This not only enables topology identification of the overpass area, but also integrates the topology identification results with existing business data and functions, providing technical support for operation, distribution and dispatch services.

[0053] Based on the connection relationship between nodes and lines, as well as the status of each node and line, this invention can perform integrated identification of medium-voltage distribution network topology and low-voltage distribution network topology. That is, it can simultaneously identify the topology of medium-voltage distribution network and low-voltage distribution network, and the topology data of the two networks can be spliced ​​together, without the emergence of topology information islands, thus achieving full network topology identification.

[0054] The topology identification results obtained by this invention are provided to energy management systems, distribution automation systems, and production management systems, thereby improving the quality of topology data and the real-time performance of data updates in medium and low voltage distribution networks. Attached Figure Description

[0055] Figure 1 This is a block diagram of the integrated topology identification method for medium and low voltage distribution networks based on secondary terminals in an embodiment of the present invention;

[0056] Figure 2 This is a flowchart of the integrated topology identification method for medium and low voltage distribution networks based on the master station in this embodiment of the invention;

[0057] Figure 3 This is a flowchart of the integrated topology identification method for medium and low voltage distribution networks based on the master station and secondary terminals in an embodiment of the present invention;

[0058] Figure 4 This is a structural diagram of the integrated topology identification system for medium and low voltage power distribution networks in an embodiment of the present invention. Detailed Implementation

[0059] The present invention will now be described in further detail with reference to the accompanying drawings.

[0060] Example 1

[0061] Embodiment 1 of the present invention provides an integrated topology identification method for medium and low voltage distribution networks, such as... Figure 1 As shown, the specific process is as follows:

[0062] S101: The secondary terminal uses the powerline sensor module (PLSM) integrated inside the secondary terminal of the distribution network to collect power frequency distortion signals and power line signals.

[0063] S102: The secondary terminal identifies the connection relationship between the primary equipment corresponding to the secondary terminal in the distribution network based on the power frequency distortion signal;

[0064] S103: The secondary terminal sends the identification results and power line signals to the main station.

[0065] In S102 above, the secondary terminal identifies the connection relationship between the primary equipment corresponding to the secondary terminal in the distribution network based on the power frequency distortion signal, including:

[0066] The secondary terminal obtains the connection relationship identification command issued by the main station;

[0067] The secondary terminal, based on the connection relationship identification command, requests the master station to send information on all secondary terminals on the feeder of the substation connected to the dispatch and monitoring switch terminal;

[0068] The secondary terminal obtains information from all secondary terminals belonging to the main station, sent by the main station.

[0069] The secondary terminal determines the feeder where it is located based on the information sent by the master station and the power frequency distortion signal fed back by the power frequency distortion signal modulation and demodulation channel. It also measures the distance between all secondary terminals on the feeder where the secondary terminal is located through the high frequency power line signal modulation and demodulation channel.

[0070] The secondary terminal determines the connection relationship between the primary devices corresponding to the secondary terminal based on the distance.

[0071] The secondary terminal can be any one of the following: feeder terminal unit (FTU), distribution terminal unit (DTU), transformer terminal unit (TTU), low voltage terminal unit (LTU), smart energy meter, and indicator (i.e., fault / defect / abnormal indicator). In this invention, the first feeder terminal unit located on the outgoing line of the substation is called the dispatch monitoring switch terminal.

[0072] The power line sensing modules integrated into various secondary terminals of the medium- and low-voltage distribution network interact with the master station through various communication methods and according to corresponding communication protocols due to the differences between the secondary terminals. The communication network between the power line sensing modules and the master station is compatible with existing secondary terminal communication methods. In this embodiment of the invention, the power line sensing modules of different secondary terminals interact with the master station through power line carrier communication. The communication methods of DTU are mainly power wireless public network virtual private network (VPN), wireless private network, passive optical communication network (EPON), and medium-voltage power line carrier; the communication method of TTU is mainly power wireless public network virtual private network (VPN); and the communication methods of low-voltage terminal units and smart meters are mainly power line carrier communication. The remote communication interface of the power line sensing module can support the configuration of these communication methods. Since the power line sensing module is integrated into different secondary terminals, when integrated into secondary terminals such as DTU and FTU, the uplink communication channel needs to communicate with the existing power distribution system production control area, and needs to meet communication protocols such as IEC 60870-5-104 and IEC 61850; when integrated into terminals such as TTU and LTU, it can support general IoT communication protocols such as MQTT and COAP.

[0073] The secondary terminal identifies the connection relationships between nodes and lines in the medium and low voltage distribution network through the power frequency distortion signal modulation and demodulation channel and the high frequency power line signal modulation and demodulation channel of the power line sensing module. The secondary terminal also identifies the line status through the high frequency power line signal modulation and demodulation channel of the power line sensing module and identifies the node status through the broadband power line signal modulation and demodulation channel.

[0074] In S101 above, the secondary terminal uses the power line sensing module integrated inside the secondary terminal of the distribution network to collect power frequency distortion signals and power line signals, including:

[0075] The fundamental wave power line signal and the low frequency power line signal are acquired using the high frequency power line signal modulation and demodulation channel of the power line sensing module.

[0076] Power frequency distortion signals are acquired using the power frequency distortion signal modulation and demodulation channel of the power line sensing module;

[0077] The power line sensing module includes: a high-frequency power line signal modulation and demodulation channel, a wideband power line signal acquisition channel, and a power frequency distortion signal modulation and demodulation channel.

[0078] Power line signals include fundamental power line signals and low-frequency power line signals.

[0079] Example 2

[0080] Embodiment 2 of the present invention provides an integrated topology identification method for medium and low voltage distribution networks, such as... Figure 2As shown, it specifically includes:

[0081] S201: The main station receives the identification results and power line signals sent by the secondary terminal;

[0082] S202: The master station identifies the status of primary equipment and the status of lines between adjacent primary equipment based on the received identification results and power line signals.

[0083] The master station identifies the status of primary equipment and the status of lines between adjacent primary equipment based on the received identification results and power line signals, including:

[0084] The main station identifies the status of all primary equipment based on the broadband power line signal collected by the power line sensor module and the fundamental and low-frequency power line signals collected by the secondary terminal.

[0085] The main station identifies the status of the lines between adjacent primary devices based on the high-frequency power line signals collected by the power line sensing module.

[0086] Broadband power line signals include broadband power line voltage signals and broadband power line current signals;

[0087] The highest frequency of both broadband power line voltage signal and broadband power line current signal is not less than 30MHz;

[0088] The fundamental power line signal includes the fundamental voltage and the fundamental current;

[0089] Low-frequency power line signals include low-frequency voltage and low-frequency current;

[0090] The frequencies of both low-frequency voltage and low-frequency current are no higher than 2.5kHz.

[0091] The main station identifies the status of all primary equipment based on the broadband power line signal collected by the power line sensor module and the fundamental and low-frequency power line signals collected by the secondary terminals, including:

[0092] When the broadband power line signal, the fundamental power line signal, and the low-frequency power line signal are all within their respective preset amplitude ranges, the master station determines that the primary equipment is in a normal state; otherwise, the master station determines that the primary equipment is in a fault state.

[0093] The main station identifies the status of the lines between adjacent primary devices based on the high-frequency power line signals collected by the power line sensing module, including:

[0094] The master station controls the power line sensing module located at one end of the line to send a high-frequency power line signal to the power line sensing module located at the other end of the line through a high-frequency power line signal modulation and demodulation channel. At the same time, the master station controls the power line sensing module located at the other end of the line to receive the high-frequency power line signal through the high-frequency power line signal modulation and demodulation channel. When the power line sensing module located at the other end of the line receives the high-frequency power line signal and the strength of the received high-frequency power line signal is greater than the preset signal strength threshold, the master station determines that the line between the adjacent primary devices is in a normal state; otherwise, the master station determines that the line between the adjacent primary devices is in a fault state.

[0095] The main station identifies the status of the lines between adjacent primary devices based on the high-frequency power line signals collected by the power line sensing module, and then includes:

[0096] When both the primary device and the line between adjacent primary devices are in normal condition, the master station updates the original status of the primary device and the status of the line between adjacent primary devices based on the identified status of the primary device and the status of the line between adjacent primary devices.

[0097] When both the primary device and the adjacent primary device are in a fault state, or when any of the primary devices and the adjacent primary devices are in a fault state, the master station reissues the connection relationship identification command to the dispatch monitoring switch terminal based on the identified status of the primary device and the status of the adjacent primary devices, so that the dispatch monitoring switch terminal can re-identify the connection relationship between the status of the primary device and the status of the adjacent primary devices.

[0098] High-frequency power line signals include narrowband power line signals of 10kHz to 500kHz and broadband power line signals of 1MHz to 30MHz.

[0099] The secondary terminal can be any one of the following: feeder terminal unit, station terminal unit, transformer terminal unit, low-voltage terminal unit, smart energy meter, and indicator.

[0100] Example 3

[0101] Embodiment 3 of the present invention provides an integrated topology identification method for medium and low voltage distribution networks, such as... Figure 3 As shown, it specifically includes:

[0102] S301: The secondary terminal uses the power line sensing module integrated inside the secondary terminal of the distribution network to collect power frequency distortion signals and power line signals.

[0103] S302: The secondary terminal identifies the connection relationship between the primary equipment corresponding to the secondary terminal in the distribution network based on the power frequency distortion signal, and sends the identification result and power line signal to the master station;

[0104] S303: The main station receives the identification results and power line signals sent by the secondary terminal, and identifies the status of the primary equipment and the status of the lines between adjacent primary equipment based on the received identification results and power line signals.

[0105] The identification results obtained in this embodiment of the invention are provided to Energy Management System (EMS), Distribution Automation System (DAS), and Production Management System (PMS) through standardized interfaces, thereby improving the quality of medium and low voltage distribution network topology data and the real-time performance of data updates.

[0106] Example 4

[0107] Embodiment 4 of the present invention provides an integrated topology identification system for medium and low voltage distribution networks, such as... Figure 4 As shown, it includes a secondary terminal and a main station; the secondary terminal integrates a power line sensing module; the power line sensing module collects power frequency distortion signals and power line signals;

[0108] The secondary terminal is used to identify the connection relationship between the primary equipment corresponding to the secondary terminal in the distribution network based on the power frequency distortion signal, and send the identification result and power line signal to the master station.

[0109] The master station is used to identify the status of primary equipment and the status of lines between adjacent primary equipment based on the received identification results and power line signals.

[0110] The secondary terminals specifically include:

[0111] The power line sensing module, integrated inside the secondary terminal of the power distribution network, is used to collect power frequency distortion signals and power line signals.

[0112] The connection relationship identification module is used to identify the connection relationship between primary devices corresponding to secondary terminals in the power distribution network based on power frequency distortion signals.

[0113] The transmitting module is used by the secondary terminal to send the identification results and power line signals to the master station.

[0114] The power line sensing module is specifically used for:

[0115] The fundamental wave power line signal and the low frequency power line signal are acquired using the high frequency power line signal modulation and demodulation channel of the power line sensing module.

[0116] Power frequency distortion signals are acquired using the power frequency distortion signal modulation and demodulation channel of the power line sensing module;

[0117] The power line sensing module includes: a high-frequency power line signal modulation and demodulation channel, a wideband power line signal acquisition channel, and a power frequency distortion signal modulation and demodulation channel.

[0118] Power line signals include fundamental power line signals and low-frequency power line signals.

[0119] The connection relationship identification module is specifically used for:

[0120] The secondary terminal obtains the connection relationship identification command issued by the main station;

[0121] The secondary terminal, based on the connection relationship identification command, requests the master station to send information on all secondary terminals on the feeder of the substation connected to the dispatch and monitoring switch terminal;

[0122] The secondary terminal obtains information from all secondary terminals belonging to the main station, sent by the main station.

[0123] The secondary terminal determines the feeder where it is located based on the information sent by the master station and the power frequency distortion signal fed back by the power frequency distortion signal modulation and demodulation channel. It also measures the distance between all secondary terminals on the feeder where the secondary terminal is located through the high frequency power line signal modulation and demodulation channel.

[0124] The secondary terminal determines the connection relationship between the primary devices corresponding to the secondary terminal based on the distance.

[0125] The secondary terminal can be any one of the following: Feeder Terminal Unit (FTU), Distribution Terminal Unit (DTU), Transformer Terminal Unit (TTU), Low Voltage Terminal Unit (LTU), smart meter, and indicator (i.e., fault / defect / abnormal indicator).

[0126] The main site specifically includes:

[0127] The receiving module is used to receive the identification results and power line signals sent by the secondary terminal;

[0128] The line status identification module is used to identify the status of primary equipment and the status of lines between adjacent primary equipment based on the received identification results and power line signals.

[0129] The line status identification module is specifically used for:

[0130] The primary equipment status identification unit is used to identify the status of all primary equipment based on the broadband power line signal collected by the power line sensing module and the fundamental and low-frequency power line signals collected by the secondary terminal.

[0131] The line status identification unit is used to identify the status of the lines between adjacent primary devices based on the high-frequency power line signals collected by the power line sensing module.

[0132] The aforementioned broadband power line signals include broadband power line voltage signals and broadband power line current signals;

[0133] The highest frequency of both broadband power line voltage signal and broadband power line current signal is not less than 30MHz;

[0134] The fundamental power line signal includes the fundamental voltage and the fundamental current;

[0135] Low-frequency power line signals include low-frequency voltage and low-frequency current;

[0136] The frequencies of both low-frequency voltage and low-frequency current are no higher than 2.5kHz.

[0137] The primary equipment status identification unit is specifically used for:

[0138] When the broadband power line signal, the fundamental power line signal, and the low-frequency power line signal are all within their respective preset amplitude ranges, the master station determines that the primary equipment is in a normal state; otherwise, the master station determines that the primary equipment is in a fault state.

[0139] The line status identification unit is specifically used for:

[0140] The master station controls the power line sensing module located at one end of the line to send a high-frequency power line signal to the power line sensing module located at the other end of the line through a high-frequency power line signal modulation and demodulation channel. At the same time, the master station controls the power line sensing module located at the other end of the line to receive the high-frequency power line signal through the high-frequency power line signal modulation and demodulation channel. When the power line sensing module located at the other end of the line receives the high-frequency power line signal and the strength of the received high-frequency power line signal is greater than the preset signal strength threshold, the master station determines that the line between the adjacent primary devices is in a normal state; otherwise, the master station determines that the line between the adjacent primary devices is in a fault state.

[0141] The main station also includes an update module, which is specifically used to update the original status of the primary device and the status of the lines between adjacent primary devices based on the identified status of the primary device and the status of the lines between adjacent primary devices when both the primary device and the adjacent primary device are in normal condition.

[0142] When both the primary device and the adjacent primary device are in a fault state, or when any of the primary devices and the adjacent primary devices are in a fault state, the master station reissues the connection relationship identification command to the dispatch monitoring switch terminal based on the identified status of the primary device and the status of the adjacent primary devices, so that the dispatch monitoring switch terminal can re-identify the connection relationship between the status of the primary device and the status of the adjacent primary devices.

[0143] The high-frequency power line signals include narrowband power line signals of 10kHz to 500kHz and broadband power line signals of 1MHz to 30MHz.

[0144] For ease of description, the various parts of the above device are described separately as modules or units based on their functions. Of course, in implementing this application, the functions of each module or unit can be implemented in one or more software or hardware components.

[0145] Those skilled in the art will understand that embodiments of this application can be provided as methods, systems, or computer program products. Therefore, this application can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, this application can take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0146] This application is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of this application. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart... Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0147] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0148] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0149] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Those skilled in the art can still make modifications or equivalent substitutions to the specific implementation of the present invention by referring to the above embodiments. Any modifications or equivalent substitutions that do not depart from the spirit and scope of the present invention are within the protection scope of the present invention pending approval.

Claims

1. A method for integrated topology identification in medium and low voltage distribution networks, characterized in that, include: The main station receives the identification results and power line signals sent by the secondary terminal; The master station identifies the status of primary equipment and the status of lines between adjacent primary equipment based on the received identification results and power line signals; The identification result is the connection relationship between the secondary terminal and the corresponding primary device; The master station identifies the status of primary equipment and the status of lines between adjacent primary equipment based on the received identification results and power line signals, including: The main station identifies the status of all primary equipment based on the broadband power line signal in the power line signal, the fundamental power line signal collected by the secondary terminal, and the low-frequency power line signal in the power line signal. The main station identifies the status of the lines between adjacent primary devices based on the high-frequency power line signals collected by the power line sensing module. The power line signals include: broadband power line signals and low-frequency power line signals; Among them, the secondary terminal uses the power line sensing module integrated inside the secondary terminal of the distribution network to collect power frequency distortion signal and power line signal; The secondary terminal identifies the connection relationship between the primary equipment corresponding to the secondary terminal in the distribution network based on the power frequency distortion signal; The secondary terminal sends the identification results and power line signals to the main station.

2. The integrated topology identification method for medium and low voltage distribution networks according to claim 1, characterized in that, The secondary terminal identifies the connection relationship between primary devices corresponding to the secondary terminal in the distribution network based on the power frequency distortion signal, including: The secondary terminal obtains the connection relationship identification command issued by the main station; Based on the connection relationship identification command, the secondary terminal requests the master station to send information on all secondary terminals on the feeder of the substation connected to the dispatch monitoring switch terminal; The secondary terminal obtains information from the main station regarding all secondary terminals belonging to the main station; The secondary terminal determines the feeder where the secondary terminal is located based on the information sent by the master station and the power frequency distortion signal fed back by the power frequency distortion signal modulation and demodulation channel. It also measures the distance between the secondary terminal and all secondary terminals on the feeder where the secondary terminal is located through the high frequency power line signal modulation and demodulation channel. The secondary terminal determines the connection relationship between the primary devices corresponding to the secondary terminal based on the distance.

3. The integrated topology identification method for medium and low voltage distribution networks according to claim 1, characterized in that, The secondary terminal is any one of the following: feeder terminal unit, station terminal unit, transformer terminal unit, low-voltage terminal unit, smart energy meter, and indicator.

4. The integrated topology identification method for medium and low voltage distribution networks according to claim 1, characterized in that, The secondary terminal uses a power line sensing module integrated within the secondary terminal of the distribution network to collect power frequency distortion signals and power line signals, including: The fundamental wave power line signal and the low frequency power line signal are acquired using the high frequency power line signal modulation and demodulation channel of the power line sensing module. Power frequency distortion signals are acquired using the power frequency distortion signal modulation and demodulation channel of the power line sensing module; The power line sensing module includes: a high-frequency power line signal modulation and demodulation channel, a wideband power line signal acquisition channel, and a power frequency distortion signal modulation and demodulation channel. The power line signal includes fundamental power line signal and low-frequency power line signal.

5. The integrated topology identification method for medium and low voltage distribution networks according to claim 1, characterized in that, The broadband power line signal includes a broadband power line voltage signal and a broadband power line current signal; The highest frequency of both the broadband power line voltage signal and the broadband power line current signal is not less than 30MHz; The fundamental power line signal includes fundamental voltage and fundamental current; The low-frequency power line signal includes low-frequency voltage and low-frequency current; The frequencies of both the low-frequency voltage and the low-frequency current are no higher than 2.5 kHz.

6. The integrated topology identification method for medium and low voltage distribution networks according to claim 5, characterized in that, The main station identifies the status of all primary equipment based on the broadband power line signal collected by the power line sensor module and the fundamental and low-frequency power line signals collected by the secondary terminals, including: When the broadband power line signal, the fundamental power line signal, and the low-frequency power line signal are all within their respective preset amplitude ranges, the master station determines that the primary equipment is in a normal state; otherwise, the master station determines that the primary equipment is in a fault state.

7. The integrated topology identification method for medium and low voltage distribution networks according to claim 1, characterized in that, The main station identifies the status of the lines between adjacent primary devices based on the high-frequency power line signals collected by the power line sensing module, including: The master station controls the power line sensing module located at one end of the line to send a high-frequency power line signal to the power line sensing module located at the other end of the line through a high-frequency power line signal modulation and demodulation channel. At the same time, the master station controls the power line sensing module located at the other end of the line to receive the high-frequency power line signal through the high-frequency power line signal modulation and demodulation channel. When the power line sensing module located at the other end of the line receives the high-frequency power line signal and the strength of the received high-frequency power line signal is greater than a preset signal strength threshold, the master station determines that the line between adjacent primary devices is in a normal state; otherwise, the master station determines that the line between adjacent primary devices is in a fault state.

8. The integrated topology identification method for medium and low voltage distribution networks according to claim 1, characterized in that, The main station identifies the status of the lines between adjacent primary devices based on the high-frequency power line signals collected by the power line sensing module, and then includes: When both the primary device and the line between adjacent primary devices are in normal condition, the master station updates the original status of the primary device and the status of the line between adjacent primary devices based on the identified status of the primary device and the status of the line between adjacent primary devices. When both the primary device and the adjacent primary device are in a fault state, or when any of the primary devices and the adjacent primary devices are in a fault state, the master station reissues the connection relationship identification command to the dispatch monitoring switch terminal based on the identified status of the primary device and the status of the adjacent primary devices, so that the dispatch monitoring switch terminal can re-identify the connection relationship between the status of the primary device and the status of the adjacent primary devices.

9. The integrated topology identification method for medium and low voltage distribution networks according to claim 1, characterized in that, The high-frequency power line signal includes 10kHz. 500kHz narrowband power line signal and 1MHz 30MHz broadband power line signal.

10. The integrated topology identification method for medium and low voltage distribution networks according to claim 1, characterized in that, The secondary terminal is any one of the following: feeder terminal unit, station terminal unit, transformer terminal unit, low-voltage terminal unit, smart energy meter, and indicator.

11. A secondary terminal, used in the integrated topology identification method for medium and low voltage distribution networks as described in claim 1, characterized in that, include: The power line sensing module, integrated inside the secondary terminal of the power distribution network, is used to collect power frequency distortion signals and power line signals. The connection relationship identification module is used to identify the connection relationship between primary devices corresponding to secondary terminals in the power distribution network based on the power frequency distortion signal. The transmitting module is used by the secondary terminal to send the identification results and power line signals to the master station.

12. A master station for use in the integrated topology identification method for medium and low voltage distribution networks as described in claim 1, characterized in that, include: The receiving module is used to receive the identification results and power line signals sent by the secondary terminal; The status identification module is used to identify the status of primary equipment and the status of lines between adjacent primary equipment based on the received identification results and power line signals.

Images