CN113394879B - Topology identification system and method adopting single-phase intelligent household sensing device - Google Patents

Topology identification system and method adopting single-phase intelligent household sensing device Download PDF

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Publication number
CN113394879B
CN113394879B CN202110508164.5A CN202110508164A CN113394879B CN 113394879 B CN113394879 B CN 113394879B CN 202110508164 A CN202110508164 A CN 202110508164A CN 113394879 B CN113394879 B CN 113394879B
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equipment
topology identification
topology
phase
end equipment
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CN113394879A (en
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白桦
王正用
孔王莺
邱益林
李海龙
骆侃
刘臻
宋靖涛
王韬樾
林斌
褚如旭
蔡旭锋
李亚胜
邓非凡
樊铜胜
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Hangzhou Commnet Software Technology Co ltd
Hangzhou Zhiwei Yilian Power Technology Co ltd
Zhejiang Huayun Electric Power Engineering Design Consulting Co
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Hangzhou Commnet Software Technology Co ltd
Hangzhou Zhiwei Yilian Power Technology Co ltd
Zhejiang Huayun Electric Power Engineering Design Consulting Co
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
    • H02J13/00001—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by the display of information or by user interaction, e.g. supervisory control and data acquisition systems [SCADA] or graphical user interfaces [GUI]
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
    • H02J13/00002—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by monitoring
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
    • H02J13/00006—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
    • H02J13/00006—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment
    • H02J13/00022—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment using wireless data transmission
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
    • H02J13/00006—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment
    • H02J13/00028—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment involving the use of Internet protocols
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
    • H02J2203/20—Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]
    • 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
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02B90/20—Smart grids as enabling technology in buildings sector
    • 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
    • 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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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Human Computer Interaction (AREA)
  • Remote Monitoring And Control Of Power-Distribution Networks (AREA)

Abstract

The invention discloses a topology identification system and a method adopting a single-phase intelligent household sensing device. The problem that an intelligent meter box at a user side does not have functions of identifying and verifying the physical topology of a transformer area in the prior art is solved; the invention comprises a head end device which is arranged at the secondary stage of a transformer; the middle section equipment is arranged at a branch box of the built-in circuit breaker; the terminal equipment adopts a single-phase intelligent household sensing device and is arranged at an electric meter box with a built-in user single-phase electric meter, and the single-phase intelligent household sensing device acquires a topology identification signal through a single-phase power transmission line; the head end equipment, the middle section equipment and the tail end equipment are sequentially connected through a power line; topology identification modules for detecting and sending identification current signals modulated by 2DPSK are arranged in the device. The single-phase intelligent household sensing device is provided with a topology identification module, and a topology identification signal can be obtained through the characteristic current of the single-phase power transmission line, so that the intelligent equipment on the user side has the functions of district physical topology identification and verification.

Description

Topology identification system and method adopting single-phase intelligent household sensing device
Technical Field
The invention relates to the field of distribution network physical topology identification, in particular to a topology identification system and method adopting a single-phase intelligent household sensing device.
Background
The distribution transformer area is a tip organization of a power distribution network, is directly connected with power consumers, is large in quantity, complex in wiring and variable in operation mode, causes single-phase load unbalance, is disordered in corresponding relation of household variables, is imperfect in transformer account data, and is difficult to check data, so that topological information of the transformer area is wrong, fault location is difficult, operation and maintenance cost is high, operation efficiency is low, loss of the transformer area is high, data distortion such as line loss calculation is caused, line loss of the high-loss transformer area is often more than 10%, and power grid resources are greatly wasted. Power distribution block intelligence is an effective way to change this condition.
At present, two modes of manual site identification (manual mode) and system automatic identification (online mode) are mainly used for identifying and verifying the topological structure of the low-voltage transformer area. The manual mode needs to arrange staff to the on-site identification, and is inefficient, with high costs, and equipment change still needs artifical proofreading. The online mode mainly adopts a power frequency distortion current and characteristic current mode, and the two modes both need to add larger current signals on the distribution lines and generate larger interference on the power supply lines.
The intelligent distribution platform area is a power supply area from a high-voltage pile head of a distribution transformer to a user, is composed of the distribution transformer, an intelligent distribution unit, a low-voltage line and user side equipment, realizes the functions of electric energy distribution, electric energy metering, reactive compensation, automatic measurement, acquisition, protection, monitoring and the like of power supply and utilization information, and has the intelligent characteristics of information, automation and interaction. The realization of intelligent characteristics requires that a platform area needs to be equipped with necessary secondary equipment with functions of communication, measurement, acquisition, protection, monitoring and the like besides a complete primary equipment.
In addition to the intelligent distribution terminal, there is also a higher standard for the intelligent device on the user side, for example, a "station end sensing system and method" disclosed in chinese patent literature, whose publication number CN110673079A includes: the meter box intelligent terminal is used for monitoring a user side, judging the power failure reason of the meter box and identifying the user load type, and sending the power failure reason and the user load type to the master station; the transformer outgoing line cabinet is arranged on one side of the transformer outgoing line cabinet, and is used for monitoring the meter box intelligent terminal and the transformer area, judging transformer area fault information and sending the fault information to the main station; and the master station is used for receiving the power failure reason and the user load type sent by the meter box intelligent terminal and receiving the fault information sent by the platform area intelligent terminal.
Although the scheme comprises the meter box intelligent terminal, the meter box intelligent terminal can only be used for monitoring a user side, judging the power failure reason of the meter box and identifying the user load type, and sending the power failure reason and the user load type to the master station without the functions of platform area physical topology identification and verification.
Disclosure of Invention
The invention mainly solves the problem that the intelligent meter box at the user side in the prior art does not have the functions of identifying and verifying the physical topology of the transformer area; the topology identification system and method adopting the single-phase intelligent household sensing device are provided, a topology identification module is added in the intelligent household sensing device, and a current signal modulated by 2DPSK is used as an identification signal for identification, so that the physical topology structure of a low-voltage distribution network can be accurately identified, and the interference of large current on a line to a power grid is reduced; and the user side intelligent equipment has the functions of identifying and verifying the physical topology of the transformer area.
The technical problem of the invention is mainly solved by the following technical scheme:
a topology identification system using a single-phase smart home sensing device includes
The head end equipment is arranged at the secondary stage of the transformer;
the middle section equipment is arranged at a branch box of the built-in circuit breaker;
the terminal equipment adopts a single-phase intelligent household sensing device and is arranged at an electric meter box with a built-in user single-phase electric meter, and the single-phase intelligent household sensing device acquires a topology identification signal through a single-phase power transmission line;
the head end equipment, the middle section equipment and the tail end equipment are sequentially connected through a power line; topology identification modules for detecting and sending identification current signals modulated by 2DPSK are arranged in the device.
According to the scheme, the end equipment adopts a single-phase intelligent household sensing device, a topology identification module is arranged in the single-phase intelligent household sensing device, and a topology identification signal can be acquired through the characteristic current of a single-phase power transmission line, so that the intelligent equipment on the user side has the functions of district physical topology identification and verification; the 2DPSK modulated current signal is used as an identification signal, so that the physical topological structure of the low-voltage distribution network can be accurately identified, and the interference of large current on a line to a power grid is reduced.
Preferably, the single-phase smart home sensing device comprises:
the single-phase power supply module is used for obtaining electric energy on the single-phase power transmission line and supplying power to the whole single-phase intelligent household sensing device;
the voltage/current sensing module comprises a voltage/current transformer and a sampling resistor, and the sampling resistor samples a voltage/current signal on the single-phase power transmission line output by the voltage/current transformer;
the single-phase measuring module is used for acquiring voltage/current signals sampled by the sampling resistor and metering single-phase voltage, current, power and electric energy at the side of the electric meter;
the main control module receives metering information of the single-phase measuring module; and responding the command issued by the head-end equipment, recording the response timestamp, and controlling the topology identification module of the single-phase intelligent user sensing device to send a topology identification signal.
The single-phase peeling and electricity-taking module adopts a miniature puncture wire clamp which can be installed and welded on a PCB (printed circuit board), can effectively utilize the narrow space below a single-phase electric meter, and can be used for peeling and taking electricity for the live wire L and the zero line N of a power transmission line. After power is taken, a voltage/current induction module samples a voltage/current signal on the power transmission line through a sampling resistor, transmits the voltage/current signal to a single-phase measurement module for metering, and transmits the voltage/current signal to a topology identification module for detecting a topology identification signal; and the metering information and the topology identification detection information are respectively transmitted to the main control module for metering and judgment.
Preferably, the main control module of the single-phase intelligent household sensing device is connected with:
the micropower wireless module is a receiving and transmitting integrated module adopting a GFSK modulation mode, and the working frequency range is 471 MHz-486 MHz;
the HPLC module adopts an OFDM modulation mode, and the carrier frequency range is 0.7 MHz-12 MHz;
the power supply module is used for converting alternating current acquired by the single-phase peeling electricity-taking module from the single-phase power transmission line into direct current required by the interior of the single-phase intelligent household sensing device; the power module comprises a super capacitor and a power-off detection unit, wherein the super capacitor is used for supplying power to the device when the power-off detection unit detects that the device is powered off.
The wireless transmission of information is carried out with external connection through a power wireless module and an HPLC module (broadband power carrier module); the power supply module converts the 220V alternating current of the LN into the direct current required by the interior of the terminal. Meanwhile, a super capacitor is arranged in the power module, power failure detection is carried out, after power failure, the super capacitor can be used for supplying power for 30 seconds to the terminal, and power failure fault information is sent out through the HPLC module or the micropower wireless module.
A topology identification method adopting a single-phase intelligent household perception device comprises the following steps:
s1: acquiring the equipment address and the equipment type of each equipment in the topology identification system;
s2: all the middle-section equipment and the tail-end equipment are time-synchronized with the head-end equipment;
s3: the head end equipment calls the tail end equipment or the middle section equipment one by one, issues a command of sending a topology identification signal, and respectively records a time stamp and a response time stamp of the topology identification signal; the middle-section equipment detects the topology identification signal in real time and records a timestamp of the detected topology identification signal;
s4: the head end equipment compares the time stamp of the detected topology identification signal with the time stamp of the transmitted topology identification command, and forms the topology of the power distribution station area according to the topology identification commands detected by the head end equipment and the middle section equipment;
s5: time stamp t for issuing commands through head-end equipmentrequestTime stamp t of each end device or middle device responseanswerAnd time stamp t of topology identification signal detected by each middle section devicetestAnd verifying the topology of the power distribution station area according to the sequence. And verifying whether the physical topological relation recognition result is correct or not through the time sequence.
The scheme adopts the current signal modulated by the 2DPSK as the identification signal, so that the physical topological structure of the low-voltage distribution network can be accurately identified, and the interference of large current on a line to a power grid is reduced.
Preferably, the step S3 includes the following steps:
s301: the head end equipment issues a topology identification signal sending command to each tail end equipment one by one at intervals of rated time T, and binds and records a timestamp T of the issuing commandrequestAnd a device address of the end device;
s302: after receiving the command of sending the topology identification signal, the single-phase intelligent user of the terminal equipment responds to the head-end equipment and executes the sending of the topology identification signal to the upper stage;
s303: the head end equipment judges whether the response is received, if so, the timestamp t of the response of the tail end equipment is recordedanswer(ii) a If not, recording the equipment address of the terminal equipment;
s304: all the middle section equipment detects the topology identification signals in real time and respectively detects the time stamps t of the topology identification signalstestBinding and storing the device address of the middle-stage device;
s305: the head end equipment judges whether all the tail end equipment respond and executes a command of sending the topology identification signal, if so, the next step is carried out; if not, returning to the step S301;
s306: the head end equipment issues a command for sending the topology identification signal to each middle section equipment one by one at intervals of rated time T, and binds and records a timestamp T for issuing the commandrequestAnd the device address of the middle device;
s307: after receiving the command of sending the topology identification signal, the middle-section equipment responds to the head-end equipment and executes the sending of the topology identification signal to the upper stage;
s308: the head end equipment judges whether the response is received, if yes, the timestamp t of the response of the middle section equipment is recordedanswer(ii) a If not, recording the equipment address of the middle-stage equipment;
s309: all the middle-section equipment detects the topology identification signals in real time and respectively detects the timestamps t of the topology identification signalstestBinding and storing the device address of the middle-stage device;
s310: the head end equipment judges whether all the middle section equipment responds and executes a command of sending the topology identification signal, if so, the process is finished; if not, the process returns to step S306.
And ensuring that all equipment in the distribution area has response without omission, and preparing for next step of distribution area topology formation.
Preferably, the step S4 includes the following steps:
s401: the head-end equipment reads the time stamp t of all the middle-section equipment which successfully detects the topology identification signaltestWith time stamp of the command issuedtrequestComparing to obtain the device address set IP corresponding to the terminal device or the middle device which responds to the command;
s402: the head-end equipment judges the middle-section equipment and the head-end equipment to which the tail-end equipment belongs according to the equipment address of the middle-section equipment contained in the equipment address set IP corresponding to each tail-end equipment;
s403: the head end equipment further judges the superior middle section equipment or the head end equipment to which each middle section equipment belongs according to the equipment address set IP corresponding to the middle section equipment;
s404: taking the device address set IP corresponding to each terminal device as a full set, and complementing the device address set IP corresponding to each middle-stage device in the set, wherein if only one element exists in the complemented set, the middle-stage device corresponding to the device address set IP is the upper stage of the terminal device;
s405: taking the device address set IP of the middle-stage device as a complete set, and calculating a complement set of the device address set IP corresponding to each middle-stage device in the set, wherein if only one element exists in the calculated complement set, the middle-stage device corresponding to the device address set IP is a superior stage;
s406: repeating the step S405 until the elements in the device address set IP corresponding to the final middle-stage device are only the device and the head-end device; determining a branch in the topology of the transformer area according to the obtained upper and lower level sequence;
s407: repeating the steps S404 to S406 until all branches corresponding to the terminal equipment are determined; and fusing the branches to determine the final topology of the power distribution area.
And obtaining an equipment address IP set according to the comparison of the timestamps, and judging the superior-subordinate relation of each equipment according to a complementary set between the equipment address IP sets.
Preferably, the device address set IP includes a device address of a head-end device issuing a command, a device address of a tail-end device or a middle-stage device responding to the command, and a device address of a middle-stage device detecting a topology identification signal sent by the tail-end device or the middle-stage device; timestamp t for correspondingly binding equipment addresses of middle-stage equipment in equipment address set IPtestThe following conditions are satisfied: t is ttest∈[trequest-T，trequest+T]. And determining the head-end equipment, the middle-section equipment and/or the tail-end equipment of the same branch by comparing the time stamps.
Preferably, the step S5 includes the following steps:
s501: obtaining and comparing command time stamps t issued by all devices in the same branchrequestTime stamp t of the responseanswerAnd a time stamp t of the detection of the topology identification signaltestDetermining the time stamp of the same identification process;
the timestamp of the same identification process satisfies the following condition:
ttest∈[trequest-T，trequest+T]
tanswer∈[trequest-T，trequest+T]
s502: according to the time stamp t of the responseanswerAnd a time stamp t of the detection of the topology identification signaltestThe corresponding terminal equipment and/or middle equipment are/is sequenced according to the sequence to obtain topological branches based on the time sequence;
s503: comparing the topological branch based on the time sequence with the original topological branch to judge whether the topological branch is consistent; if yes, the topology is checked to be correct, and the step S504 is entered; if not, go to step S505;
s504: selecting another branch, repeating the steps S501-S503 until all branches are verified to be correct, and ending;
s505: selecting timestamps of other identification processes of the branch, repeating the steps S501-S503, and counting the times of entering the step S504 and the times of entering the step S505;
if the number of times of the step S505 is more than or equal to one half of the total number of times, alarming, informing relevant personnel of field verification, and determining a topological relation; if the number of times of entering step S505 is less than one half of the total number of times, it is determined that the original topology is correct, the time of the corresponding device is not synchronized, and time synchronization is performed again.
And verifying the topological relation through the timestamp sequence, verifying whether the topological relation is correct, and simultaneously verifying whether the time of each device is synchronous to prevent the device from being omitted in the process of identifying the topology.
The invention has the beneficial effects that:
1. the single-phase intelligent household sensing device is provided with a topology identification module, and a topology identification signal can be obtained through the characteristic current of the single-phase power transmission line, so that the intelligent equipment on the user side has the functions of district physical topology identification and verification.
2. The 2DPSK modulated current signal is used as an identification signal, so that the physical topological structure of the low-voltage distribution network can be accurately identified, and the interference of large current on a line to a power grid is reduced.
3. And verifying the topological relation through the time stamp sequence, checking whether the topological relation is correct, and simultaneously verifying whether the time of each device is synchronous to prevent the device from being omitted in the process of identifying the topology.
Drawings
Fig. 1 is a schematic diagram of a power distribution grid topology of the present invention.
Fig. 2 is a block diagram of the connection of the single-phase smart home sensing device according to the present invention.
FIG. 3 is a flowchart of a topology identification method of the present invention.
In the figure, 1, a head end device, 2, a middle section device, 3, a tail end device, 4, a topology identification module, 5, a main control module, 6, a single-phase peeling electricity-taking module, 7, a voltage/current induction module, 8, a single-phase measurement module, 9, a power supply module, 10, an HPLC module and 11, a micro-power wireless module are arranged.
Detailed Description
The technical scheme of the invention is further specifically described by the following embodiments and the accompanying drawings.
Example (b):
the topology identification system using the single-phase smart home sensing device in this embodiment, as shown in fig. 1, sequentially includes a head-end device 1, a middle-stage device 2, and a tail-end device 3.
The topology of the low voltage distribution substation is a typical tree structure. The trunk is the secondary of the transformer, is connected with one-stage or multi-stage branch boxes to serve as branch nodes, and the tail end of the tree is an electric meter box at a user end; circuit breakers of different specifications are usually arranged in the branch box, and a user electric meter is arranged in the electric meter box.
In the present embodiment, the head-end device 1 is installed at the secondary stage of the transformer, the middle-stage device 2 is installed at the branch box, and the end-point device 3 is installed at the meter box.
The head end equipment 1 adopts an edge internet of things agent, the edge internet of things agent is secondary equipment integrating functions of power supply information acquisition of a power distribution station area, equipment state monitoring and communication networking, local analysis and decision, main station communication and cooperative computing and the like, a platform hardware design and a distributed edge computing framework are adopted, and business function realization and flexible expansion are supported in a software definition mode.
The edge Internet of things agent is internally provided with a physical topology identification module which controls equipment in the power distribution network to send and detect the characteristic current, stores and sends the collected data carried by the characteristic current and the information of a characteristic current emitter received by an HPLC (high performance liquid chromatography) module to a master station, and processes and graphically displays the physical topology of the power distribution station area by a physical topology generation module of an intelligent power utilization management platform of the master station.
The platform software adopts a linux operating system and adopts container deployment to support a one-container and multi-application mode. The container runs on the operating system, provides a unified virtual environment required by the application APP, realizes decoupling of the application APP with the operating system and a hardware platform, supports independent development and running of the upper-layer application APP, provides an external and internal resource calling interface with unified labels, supports remote and local application installation, upgrading, starting, stopping and unloading, and supports application state query and anomaly monitoring.
The middle section equipment 2 adopts an intelligent molded case circuit breaker. The intelligent molded case circuit breaker adopts a plastic insulator, and can automatically cut off the current after the current exceeds the trip setting. The intelligent molded case circuit breaker is additionally provided with a local communication module, a collection metering module and a physical topology identification module on the basis of the traditional molded case circuit breaker, and is novel primary and secondary fusion equipment. The built-in physical topology identification module 4 has the functions of transmitting and detecting topology identification characteristic current, can detect the characteristic current transmitted by an intelligent molded case circuit breaker or an intelligent user perception terminal, and can transmit the characteristic current under the control of an intelligent distribution terminal. And the detected parameters of the characteristic current or the information of the emission characteristic current are transmitted to the intelligent distribution and transformation terminal through HPLC and are processed by the intelligent distribution and transformation terminal in a unified way.
The end equipment 3 adopts a single-phase intelligent household sensing device. As shown in fig. 2, the single-phase intelligent household sensing device comprises a single-phase peeling electricity-taking module 6, a voltage/current induction module 7, a single-phase measurement module 8, a main control module 9, a micro-power wireless module 11, an HPLC module 10 and a power supply module 9.
The main control module 5 implements system logic processing, and mainly includes an MCU and a memory. The main control module 5 realizes data transmission with the HPLC module 10, the micro-power wireless module 11 and the topology identification module 4 through a serial port/USB. The main control module 5 receives various control signals such as power-off detection signals, temperature detection signals and the like through I/O; enabling and receiving the high-frequency pulse signal output by the metering chip of the single-phase measuring module 8 through I/O; the external interface is realized by 485/Ethernet.
The single-phase peeling electricity-taking module 6 can be installed and welded on a miniature puncture wire clamp on a PCB, can effectively utilize the narrow space below a single-phase electric meter, and can be used for peeling electricity-taking for a live wire L and a zero line N of a power transmission line. The single-phase power-taking module 6 is used for obtaining electric energy on the single-phase power transmission line and supplying power to the whole single-phase intelligent household sensing device; the sensing device for the single-phase intelligent user is compact in structure, adopts a power supply mode of peeling and taking power, and is convenient to install and construct.
The voltage/current sensing module 7 comprises a voltage/current transformer and a sampling resistor, and the sampling resistor samples a voltage/current signal output by the voltage/current transformer on the single-phase power transmission line; after power is taken, the voltage/current induction module 7 samples voltage/current signals on the power transmission line through the sampling resistor and transmits the voltage/current signals to the single-phase measurement module 8 for metering.
The single-phase measuring module 8 adopts a high-precision measuring chip to obtain voltage/current signals sampled by the sampling resistor, and measures single-phase voltage, current, power and electric energy at the side of the ammeter, wherein the accuracy grade is 0.5 grade.
The micropower wireless module 11 is a receiving and transmitting integrated module adopting a GFSK modulation mode, and the working frequency range is 471 MHz-486 MHz; the transmission rate was 10 kbps. The method conforms to the communication protocol of the power consumer electricity utilization information acquisition system in part 4 of the communication protocol of the national power grid Q/GDW 11016 and 2013 based on the data transmission protocol of micropower wireless communication.
The HPLC module 10 adopts an OFDM modulation mode, and the carrier frequency range is 0.7 MHz-12 MHz; the HPLC module 10 adopts a chip set which accords with the technical specification of interconnection and intercommunication of low-voltage power line broadband carrier communication of Q/GDW 11612 plus 2016 of the national power grid company, and has strong anti-interference capability and the maximum transmission rate of 10 Mbps.
The wireless transmission of information is performed with external connection by the power wireless module 11 and the HPLC module 10 (broadband power carrier module).
The power module 9 converts alternating current acquired by the single-phase peeling and electricity-taking module 6 from the single-phase power transmission line into direct current required by the interior of the single-phase intelligent household sensing device; the power module comprises a super capacitor and a power failure detection unit, wherein the super capacitor is used for supplying power to the device when the power failure detection unit detects that the device is powered off.
The power supply module 9 changes the 220V alternating current of the LN into the direct current required by the interior of the terminal. Meanwhile, the power module 9 is internally provided with a super capacitor and has power failure detection function, after power failure, the power module can supply power to the terminal for 30 seconds through the super capacitor, and power failure information is sent out through the HPLC module 10 or the micropower wireless module 11.
The topology identification module 4 is a core module for realizing the low-voltage distribution physical topology identification function. The module adopts a 2DPSK modulation current signal as an identification signal, can accurately identify the physical connection relation of each device such as a transformer, a low-voltage cabinet incoming line switch, a low-voltage cabinet branch switch, a cable branch box switch, a floor power switch, a meter front switch and an electricity meter of a low-voltage distribution network in a distribution area, realizes automatic identification of the physical topology of the hierarchy, and has almost no interference to the distribution network. When the physical position of the equipment of the low-voltage distribution network changes, automatic verification is realized, and a new physical topology is generated.
The topology recognition module 4 adopts 2DPSK modulated currentThe signal is used as an identification signal, the current signal amplitude is small, the anti-interference capability is strong, and the influence on the power quality of a power grid is small. 2DPSK is a digital modulation scheme that represents digital information using relative phase values of preceding and following adjacent symbols. The time domain expression of the signal is: s2DPSK(t)＝∑nbng(t-nTs)Cosωct. The form is consistent with 2PSK, but bnIs a differential code after conversion, bnAnd a baseband signal anThe relationship of (1) is: bn＝anxor bn-1。
The demodulation mode of 2DPSK can adopt coherent demodulation or non-coherent demodulation, and the error rate of coherent demodulation
Figure BDA0003058339160000084
The relation with the required signal-to-noise ratio r of the system is as follows:
Figure BDA0003058339160000081
correspondingly, the relationship between the bit error rate and the signal-to-noise ratio of 2ASK adopting coherent demodulation is as follows:
Figure BDA0003058339160000082
the bit error rate versus signal-to-noise ratio for 2ASK with coherent demodulation is:
Figure BDA0003058339160000083
it can be seen that to achieve the same bit error rate, the signal-to-noise ratio required for 2DPSK is small compared to both 2ASK and 2 FSK.
This perception device is used to single-phase intelligence family obtains the sending topology identification signal command that the head end equipment was assigned through HPLC module 10, transmits to host system through the serial ports, and host system responds with host system 5 through HPLC module 10, and host system 5 upwards sends the topology identification signal through topology identification module 4.
A topology identification method using a single-phase smart user perception device is disclosed, as shown in FIG. 3, and includes the following steps:
s1: and acquiring the equipment address and the equipment type of each equipment in the topology identification system.
The networking of the power distribution station area comprises head end equipment, a plurality of middle section equipment and tail end equipment which are connected through power lines from the upper level to the lower level.
S2: all the middle section equipment and the end equipment are time-synchronized with the head-end equipment.
And (4) unifying the time of each middle-stage device and the time of each tail-end device through a satellite by taking the time of the head-end device as standard time.
S3: the head end equipment calls the tail end equipment or the middle section equipment one by one, issues a command of sending a topology identification signal, and respectively records a time stamp and a response time stamp of the topology identification signal; and the middle-section equipment detects the topology identification signal in real time and records the timestamp of the detected topology identification signal.
S301: the head end equipment issues a topology identification signal sending command to each tail end equipment one by one at intervals of rated time T, and binds and records a timestamp T of the issuing commandrequestAnd the device address of the end device.
In the present embodiment, the rated time T is 20s to 1 min.
S302: and after receiving the command of sending the topology identification signal, the end equipment responds to the head equipment and executes the sending of the topology identification signal to the upper stage.
S303: the head end equipment judges whether the response is received, if so, the timestamp t of the response of the tail end equipment is recordedanswer(ii) a If not, recording the equipment address of the end equipment.
S304: all the middle section equipment detects the topology identification signals in real time and respectively detects the time stamps t of the topology identification signalstestAnd binding and storing the device address of the middle-section device.
S305: the head end equipment judges whether all the tail end equipment respond and executes a command of sending the topology identification signal, if so, the next step is carried out; if not, the process returns to step S301.
S306: the head end equipment issues and sends a topology identification signal command to each middle section equipment one by one at intervals of rated time T, and binds and records a timestamp T of issuing the commandrequestAnd the device address of the mid-segment device.
S307: and after receiving the command of sending the topology identification signal, the middle-section equipment responds to the head-end equipment and executes the topology identification signal sending to the upper stage.
S308: the head end equipment judges whether the response is received, if so, the timestamp t of the response of the middle section equipment is recordedanswer(ii) a If not, recording the equipment address of the middle-section equipment.
S309: all the middle-section equipment detects the topology identification signals in real time and respectively detects the timestamps t of the topology identification signalstestAnd binding and storing the device address of the middle-section device.
S310: the head end equipment judges whether all the middle section equipment responds and executes a command for sending the topology identification signal, if so, the process is finished; if not, the process returns to step S306.
S4: and the head end equipment compares the time stamp of the detected topology identification signal with the time stamp of issuing the transmission topology identification command, and forms the power distribution station topology according to the topology identification commands detected by the head end equipment and the middle section equipment.
S401: the head-end equipment reads the time stamp t of all the middle-section equipment which successfully detects the topology identification signaltestWith the time stamp t of the command issuedrequestAnd comparing to obtain the device address set IP corresponding to the end device or the middle device responding to the command.
The device address set IP includes a device address of a head device that issues a command, a device address of a terminal device or a middle device that responds to the command, and a device address of a middle device that detects a topology identification signal sent by the terminal device or the middle device.
Timestamp t for binding corresponding to device address of middle-stage device detecting topology identification signal in device address set IPtestThe following conditions are satisfied:
ttest∈[trequest-T，trequest+T]
and determining the head-end equipment, the middle-section equipment and/or the tail-end equipment of the same branch by comparing the time stamps.
S402: and the head-end equipment judges the middle-section equipment to which the tail-end equipment belongs according to the equipment address of the middle-section equipment contained in the equipment address set IP corresponding to each tail-end equipment.
S403: and the head end equipment further judges the superior middle section equipment or the head end equipment to which each middle section equipment belongs according to the equipment address set IP corresponding to the middle section equipment.
The end device or the middle device is a subordinate branch of the middle device in the device address set IP corresponding to the end device or the middle device.
The end equipment or the middle equipment is a subordinate branch of the head end equipment which correspondingly issues a command of sending the topology identification signal.
S404: and taking the device address set IP corresponding to each terminal device as a complete set, complementing the device address set IP corresponding to each middle-stage device in the set, and if only one element exists in the complemented set, taking the middle-stage device corresponding to the device address set IP as the upper stage of the terminal device.
S405: and taking the equipment address set IP of the middle-stage equipment as a complete set, complementing the equipment address set IP corresponding to each middle-stage equipment in the set, and if only one element exists in the complemented set, taking the middle-stage equipment corresponding to the equipment address set IP as a superior stage.
S406: repeating the step S405 until the elements in the device address set IP corresponding to the final middle-stage device are only the device and the head-end device; and determining a branch in the topology of the transformer area according to the obtained upper and lower level sequence.
S407: repeating the steps S404 to S406 until all branches corresponding to the terminal equipment are determined; and fusing the branches to determine the final topology of the power distribution area.
The upper and lower level relations are judged step by step, the logic is strict, and the error probability is reduced.
As in this embodiment, the headend equipment a issues a command to send the topology identification signal to the end equipment I, and the end equipment I receives the command and then responds to the headend equipment a and sends the topology identification signal to the upper stage.
And the middle-stage equipment H and the middle-stage equipment C detect the topology identification signals in real time, and respectively record the time stamps of the detected topology identification signals after the topology identification signals sent by the end equipment I are detected. And determining that the branch from the head end equipment A to the tail end equipment I comprises the head end equipment A, the middle section equipment C, the middle section equipment H and the tail end equipment I according to the comparison between the time stamp of the command issued by the head end equipment A to the tail end equipment I and the time stamp of the detected topological signal. The device address set IP corresponding to the end device I includes IP addresses of the head-end device a, the middle-stage device C, the middle-stage device H, and the end device I.
Similarly, the head end device a calls the middle section device C and the terminal device H respectively, and the device address set IP corresponding to the middle section device H includes the head end device a, the middle section device C and the middle section device H; the device address set IP corresponding to the middle device C includes the head end device a and the middle device C.
Taking an equipment address set IP corresponding to the terminal equipment I as a complete set, and respectively taking complementary sets of equipment address sets IP corresponding to the middle-stage equipment C and the middle-stage equipment H in the set; the element in the device address set IP corresponding to the end device I and the device address set IP complementary set corresponding to the middle-stage device H is only the device address of the end device I, which indicates that the middle-stage device H is the upper stage of the end device I.
Similarly, the element in the device address set IP corresponding to the middle-stage device H and the device address set IP complement corresponding to the middle-stage device C is only the device address of the middle-stage device H, and the middle-stage device H is determined to be the branch of the middle-stage device C.
The device address set IP corresponding to the middle-segment device C only includes the device address of itself and the device address of the head-end device a, so it is determined that the middle-segment device C is a branch of the head-end device a.
Finally, the physical topological structure of A-C-H-I is formed, and in this way, the end-to-end physical topological branch from the head-end equipment A to all the end equipment is completed.
S5: time stamp t for issuing commands through head-end equipmentrequestEach end or intermediate device respondingTime stamp tanswerAnd time stamp t of topology identification signal detected by each middle section devicetestAnd verifying the topology of the power distribution station area according to the sequence.
S501: obtaining and comparing command time stamps t issued by all devices in the same branchrequestTime stamp t of the responseanswerAnd a time stamp t of the detection of the topology identification signaltestThe time stamp of the same identification process is determined.
The time stamp of the same identification process satisfies the following condition:
ttest∈[trequest-T，trequest+T]
tanswer∈[trequest-T，trequest+T]
s502: according to the time stamp t of the responseanswerAnd a time stamp t of the detection of the topology identification signaltestThe corresponding end equipment and/or middle equipment are sequenced according to the sequence to obtain the topological branch based on the time sequence.
S503: comparing the topological branch based on the time sequence with the original topological branch to judge whether the topological branch is consistent; if yes, the topology is checked to be correct, and the step S504 is entered; if not, the process proceeds to step S505.
S504: and selecting another branch, repeating the steps S501-S503 until all branches are verified to be correct, and ending.
S505: and selecting the time stamps of other identification processes of the branch, repeating the steps S501 to S503, and counting the times of entering the step S504 and the times of entering the step S505.
If the number of times of the step S505 is more than or equal to one half of the total number of times, alarming, informing relevant personnel of field verification, and determining a topological relation;
and if the topological relation determined by the related personnel is the original topological relation, the topological relation is correct, the equipment time is judged to be synchronous, and the time synchronization is carried out on the corresponding equipment. And if the topological relation determined by the related personnel is different from the original topological relation, manually updating the topological relation.
If the number of times of entering step S505 is less than one half of the total number of times, it is determined that the original topology is correct, the time of the corresponding device is not synchronized, and time synchronization is performed again.
For the equipment which is judged to be synchronous in time, carrying out manual topology verification and identifying whether the equipment of the upper level and the lower level has omission; if yes, updating the topology and then re-identifying the topology, and if not, ending.
And verifying the topological relation through the time stamp sequence, checking whether the topological relation is correct, and simultaneously verifying whether the time of each device is synchronous to prevent the device from being omitted in the process of identifying the topology.
It should be understood that the examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Further, it should be understood that various changes or modifications of the present invention may be made by those skilled in the art after reading the teaching of the present invention, and such equivalents may fall within the scope of the present invention as defined in the appended claims.

Claims (6)

1. A topology identification system using a single-phase smart home sensing device comprises
The head end equipment is arranged at the secondary stage of the transformer;
the middle section equipment is arranged at a branch box of the built-in circuit breaker;
the terminal equipment adopts a single-phase intelligent household sensing device and is arranged at an electric meter box with a built-in user single-phase electric meter, and the single-phase intelligent household sensing device acquires a topology identification signal through a single-phase power transmission line;
the head end equipment, the middle section equipment and the tail end equipment are sequentially connected through a power line; topology identification modules for detecting and sending identification current signals modulated by 2DPSK are arranged in the device;
the system adopts a topology identification method adopting a single-phase intelligent household perception device, and comprises the following steps:
s1: acquiring the equipment address and the equipment type of each equipment in the topology identification system;
s2: all the middle-section equipment and the tail-end equipment are time-synchronized with the head-end equipment;
s3: the head end equipment calls the tail end equipment or the middle section equipment one by one, issues a command of sending a topology identification signal, and respectively records a time stamp and a response time stamp of the topology identification signal; the middle-section equipment detects the topology identification signal in real time and records a timestamp of the detected topology identification signal;
s4: the head end equipment compares the time stamp of the detected topology identification signal with the time stamp of the transmitted topology identification command, and forms the topology of the power distribution station area according to the topology identification commands detected by the head end equipment and the middle section equipment;
s5: verifying the topology of the power distribution station area through the sequence of the time stamp of the command issued by the head end equipment, the time stamp of the response of each tail end equipment or the middle section equipment and the time stamp of the topology identification signal detected by each middle section equipment;
the step S4 includes the following steps:
s401: the head-end equipment reads the time stamp of all the middle-section equipment successfully detecting the topology identification signal
Figure DEST_PATH_IMAGE002
With time stamp of the command issued
Figure DEST_PATH_IMAGE004
Comparing to obtain the device address set IP corresponding to the terminal device or the middle device which responds to the command;
s402: the head-end equipment judges the middle-section equipment and the head-end equipment to which the tail-end equipment belongs according to the equipment address of the middle-section equipment contained in the equipment address set IP corresponding to each tail-end equipment;
s403: the head end equipment further judges the superior middle section equipment or the head end equipment to which each middle section equipment belongs according to the equipment address set IP corresponding to the middle section equipment;
s404: taking the device address set IP corresponding to each terminal device as a complete set, and calculating a complement set of the device address set IP corresponding to each middle-stage device in the set, wherein if only one element exists in the calculated complement set, the middle-stage device corresponding to the device address set IP is the upper stage of the terminal device;
s405: taking the device address set IP of the middle-stage device as a full set, complementing the device address set IP corresponding to each middle-stage device in the set, and if only one element exists in the complemented set, taking the middle-stage device corresponding to the device address set IP as a superior stage;
s406: repeating the step S405 until the elements in the device address set IP corresponding to the final middle-stage device are only the device and the head-end device; determining a branch in the topology of the transformer area according to the obtained upper and lower level sequence;
s407: repeating the steps S404 to S406 until all branches corresponding to the terminal equipment are determined; and fusing the branches to determine the final topology of the power distribution area.
2. The topology identification system using the single-phase smart user perception device according to claim 1, wherein the single-phase smart user perception device comprises:
the single-phase power supply module is used for obtaining electric energy on the single-phase power transmission line and supplying power to the whole single-phase intelligent household sensing device;
the voltage/current sensing module comprises a voltage/current transformer and a sampling resistor, and the sampling resistor samples a voltage/current signal on the single-phase power transmission line output by the voltage/current transformer;
the single-phase measuring module is used for acquiring voltage/current signals sampled by the sampling resistor and metering single-phase voltage, current, power and electric energy at the side of the electric meter;
the main control module receives metering information of the single-phase measuring module; and responding the command issued by the head-end equipment, recording the response timestamp, and controlling the topology identification module of the single-phase intelligent user sensing device to send a topology identification signal.
3. The topology identification system using single-phase intelligent household sensing device according to claim 1 or 2, wherein the main control module of the single-phase intelligent household sensing device is connected with:
the micropower wireless module is a receiving and transmitting integrated module adopting a GFSK modulation mode, and the working frequency range is 471 MHz-486 MHz;
the HPLC module adopts an OFDM modulation mode, and the carrier frequency range is 0.7 MHz-12 MHz;
the power supply module is used for converting alternating current acquired by the single-phase peeling electricity-taking module from the single-phase power transmission line into direct current required by the interior of the single-phase intelligent household sensing device; the power module comprises a super capacitor and a power-off detection unit, wherein the super capacitor is used for supplying power to the device when the power-off detection unit detects that the device is powered off.
4. The topology recognition system according to claim 1, wherein the step S3 comprises the following steps:
s301: head end equipment interval rated time
Figure DEST_PATH_IMAGE006
Issuing a command for sending topology identification signals to each terminal device one by one, and binding and recording timestamps of issuing commands
Figure 473751DEST_PATH_IMAGE004
And a device address of the end device;
s302: after receiving the command of sending the topology identification signal, the single-phase intelligent user of the terminal equipment responds to the head-end equipment and executes the sending of the topology identification signal to the upper stage;
s303: the head end equipment judges whether the response is received, if so, the timestamp of the response of the tail end equipment is recorded
Figure DEST_PATH_IMAGE008
(ii) a If not, recording the equipment address of the terminal equipment;
s304: all the middle-section equipment detects the topology identification signals in real time, and the timestamps of the topology identification signals which are successfully detected are respectively
Figure 249946DEST_PATH_IMAGE002
Binding and storing the device address of the middle-stage device;
s305: the head end equipment judges whether all the tail end equipment respond and executes a command of sending the topology identification signal, if so, the next step is carried out; if not, returning to the step S301;
s306: head end equipment interval rated time
Figure 623159DEST_PATH_IMAGE006
Issuing a command for sending a topology identification signal to each middle-section device one by one, and binding and recording a timestamp for issuing the command
Figure 752789DEST_PATH_IMAGE004
And the device address of the middle device;
s307: after receiving the command of sending the topology identification signal, the middle-section equipment responds to the head-end equipment and executes the sending of the topology identification signal to the upper stage;
s308: the head end equipment judges whether the response is received, if so, the timestamp of the response of the middle section equipment is recorded
Figure 160636DEST_PATH_IMAGE008
(ii) a If not, recording the equipment address of the middle-stage equipment;
s309: all the middle-section equipment detects the topology identification signals in real time and respectively detects the timestamps of the topology identification signals
Figure 451940DEST_PATH_IMAGE002
Binding and storing the device address of the middle-stage device;
s310: the head end equipment judges whether all the middle section equipment responds and executes a command for sending the topology identification signal, if so, the process is finished; if not, the process returns to step S306.
5. The topology identification system according to claim 1, wherein the device address set IP comprises the device address of the head device issuing the command, the device address of the end device or the middle device responding to the command, and the device address of the middle device detecting the topology identification signal sent by the end device or the middle device;
timestamp for correspondingly binding equipment address of middle-stage equipment in equipment address set IP
Figure 312449DEST_PATH_IMAGE002
The following conditions are satisfied:
Figure DEST_PATH_IMAGE010
。
6. the topology recognition system according to claim 1, wherein the step S5 comprises the following steps:
s501: obtaining and comparing command time stamps issued by all devices in the same branch
Figure 370404DEST_PATH_IMAGE004
Time stamp of the response
Figure 508124DEST_PATH_IMAGE008
And time stamp of detected topology identification signal
Figure 94963DEST_PATH_IMAGE002
Determining the time stamp of the same identification process;
the time stamp of the same identification process satisfies the following condition:
Figure DEST_PATH_IMAGE012
Figure DEST_PATH_IMAGE014
s502: time stamping according to the response
Figure 98560DEST_PATH_IMAGE008
And time stamp of detected topology identification signal
Figure 304414DEST_PATH_IMAGE002
The corresponding terminal equipment and/or middle equipment are/is sequenced according to the sequence to obtain topological branches based on the time sequence;
s503: comparing the topological branch based on the time sequence with the original topological branch to judge whether the topological branch is consistent; if yes, the topology is checked to be correct, and the step S504 is entered; if not, go to step S505;
s504: selecting another branch, repeating the steps S501-S503 until all branches are verified to be correct, and ending;
s505: selecting timestamps of other identification processes of the branch, repeating the steps S501-S503, and counting the times of entering the step S504 and the times of entering the step S505;
if the number of times of the step S505 is more than or equal to one half of the total number of times, alarming, informing relevant personnel of field verification, and determining a topological relation; if the number of times of entering step S505 is less than one half of the total number of times, it is determined that the original topology is correct, the time of the corresponding device is not synchronized, and time synchronization is performed again.
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