CN113572262A - Topology sending and identifying method for low-voltage Internet of things sensing terminal - Google Patents
Topology sending and identifying method for low-voltage Internet of things sensing terminal Download PDFInfo
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- CN113572262A CN113572262A CN202110804094.8A CN202110804094A CN113572262A CN 113572262 A CN113572262 A CN 113572262A CN 202110804094 A CN202110804094 A CN 202110804094A CN 113572262 A CN113572262 A CN 113572262A
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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
- H02J13/00002—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
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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
- H02J13/00006—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
- H02J13/00007—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 the power network as support for the transmission
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- 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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S40/00—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them
- Y04S40/12—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment
- Y04S40/121—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 the power network as support for the transmission
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S40/00—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them
- Y04S40/12—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment
- Y04S40/128—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 involving the use of Internet protocol
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Remote Monitoring And Control Of Power-Distribution Networks (AREA)
- Telephonic Communication Services (AREA)
Abstract
The invention discloses a topology sending and identifying method of a low-voltage IOT (Internet of things) sensing terminal, which comprises the following steps that 1, a concentrator sends a topology identification command to a secondary low-voltage IOT sensing terminal which can generate current signals of characteristic code bits; step 2, the secondary low-voltage IOT sensing terminal generates a characteristic current signal by using a topological signal transmitting circuit in the secondary low-voltage IOT sensing terminal, transmits the characteristic current signal to the primary low-voltage IOT sensing terminal at a specific time, and records the signal switching end time; step 3, simultaneously, the primary low-voltage Internet of things sensing terminal identifies current signals on the power grid by utilizing the self-collection function, and if so, the switching time is saved; and 4, the concentrator finally positions the topological relation by recalling and measuring the switching end time, the identification time and the identification phase of the two-stage low-voltage internet of things sensing terminal. The invention generates the characteristic current signal through the topology signal sending circuit on the low-voltage Internet of things sensing terminal, and can obtain a topology identification framework for monitoring the whole platform area.
Description
Technical Field
The invention relates to the field of low-voltage internet of things terminals, in particular to a topology sending and identifying method of a low-voltage internet of things sensing terminal.
Background
In recent years, the national power grid gradually advances the construction of intelligent and transparent power grids, however, the number of low-voltage resident users is huge, the distribution range is wide, and a series of power utilization problems occur, for example, the self-identification sensing capability of a power line is poor, a transformer in the same distribution room is installed relatively close, branch lines are disorderly and disorderly, and finally the affiliation of power utilization users cannot be determined, when the problems of abnormal line loss, safety failure and the like occur, a large amount of manpower and material resources are consumed to investigate and locate, the operation and maintenance cost is high, the efficiency is low, even some lawless persons utilize the phenomenon of stealing the national power, at the moment, a topology identification framework capable of monitoring the whole distribution area needs to be constructed, in recent years, due to the rapid development of a carrier technology, a plurality of new technologies of topology identification appear, however, due to the 'common zero' and coupling situations existing in communication modes such as carrier waves on low-voltage power lines, micropower wireless and the like, the cross-area communication and reading phenomena are caused, the recognition success rate is low, great challenges are brought to topology recognition, and how to obtain an accurate topological relation between a transformer and an ammeter user can become an important direction of intelligent power construction in the future.
Disclosure of Invention
The technical problem to be solved by the invention is to overcome the problems in the prior art and provide a topology sending and identifying method for a low-voltage internet of things sensing terminal, so as to accurately realize the topology relation among a power supply transformer, terminal equipment and a user. According to the scheme, low-voltage IOT sensing terminal equipment is used as a carrier, a characteristic current signal is generated through a topology signal sending circuit of a secondary low-voltage IOT sensing terminal, and the characteristic current signal is identified by a main chip with a topology identification algorithm in the primary low-voltage IOT sensing terminal.
In order to achieve the purpose, the invention provides the following technical scheme: a topology sending and identifying method of a low-voltage IOT (Internet of things) sensing terminal is established on a two-stage topology and comprises the following steps:
step 1: the concentrator sends a topology identification command to a secondary low-voltage Internet of things sensing terminal with a topology signal sending circuit according to the address of the primary low-voltage Internet of things sensing terminal;
step 2: after receiving a command of topology identification, the secondary low-voltage Internet of things sensing terminal utilizes a signal switching circuit in a topology signal sending circuit in a power grid to generate a current signal of a characteristic code bit and records the end time of switching a resistor;
and step 3: meanwhile, the low-voltage internet of things sensing terminal with alternate mining at the upper stage starts to identify and judge current signals of characteristic code bits generated on the power line, if target characteristic code bits are detected within set time, the phase of an identified list is judged according to the mean value of the current of the target characteristic code bits, and the phase identification result and the identification time are stored locally at the first-stage terminal; if the detection is not carried out within the set time, the information is not saved;
and 4, step 4: the concentrator compares and finally determines the topology identification relationship by calling and measuring the switching end time of the secondary low-voltage Internet of things sensing terminal and time marks such as the identification time and the identification phase of the primary low-voltage Internet of things sensing terminal.
Furthermore, the topology signal sending circuit is a necessary condition that the low-voltage Internet of things sensing terminal can generate a characteristic current signal, the topology signal sending circuit is composed of a signal switching circuit, a high-voltage starting circuit and a signal isolation accelerating circuit, the signal switching circuit is directly connected between zero and live wires of the electric meter, and a switch and a load with a fixed resistance value are connected in series to generate a current signal of a characteristic code bit; the circuit forms a half-wave type high-voltage direct current VIN after full-bridge rectification by VD1, VD2, VD4 and VD 8.
Further, VIN obtains a low voltage dc VCC _ TP through the high voltage start circuit, and supplies power to the driver in the signal isolation acceleration circuit.
Furthermore, the signal isolation accelerating circuit is driven by a PWM signal, and the MOS transistor VT2 is switched continuously according to the PWM signal, so that the grid voltage is changed regularly, the on-off rule similar to a switch is simulated, and the characteristic current signal with the characteristic code bit is generated.
Furthermore, the characteristic current signal generated in the secondary low-voltage IOT sensing terminal is transmitted to the receiving equipment of the primary low-voltage IOT sensing terminal through a power line, and finally the receiving equipment realizes topology identification on the characteristic current signal by utilizing a self-possessed topology identification algorithm.
Furthermore, after the low-voltage Internet of things sensing terminal with alternating acquisition at the upper stage detects the target characteristic code position, the phase position of the identified low-voltage Internet of things sensing terminal is judged according to the magnitude of the three-phase current, the identified time and the phase identification result are stored locally at the terminal, and if the characteristic current signal is not detected, no information is stored.
The invention has the beneficial effects that:
the invention provides a topology sending and identifying method of a low-voltage IOT (Internet of things) sensing terminal, which is characterized in that a concentrator sends a topology identifying command to a secondary low-voltage IOT sensing terminal through a carrier channel, the secondary low-voltage IOT sensing terminal sends a characteristic small current signal at a specific time after receiving the command, meanwhile, the primary low-voltage IOT sensing terminal identifies the current signal on a power grid by utilizing the self-collection function, and the concentrator finally positions the topology relation by calling and measuring the switching finishing time, the identification time and the identification phase of the two-stage low-voltage IOT sensing terminal, so that a topology identifying framework for monitoring the whole platform area can be obtained.
Drawings
FIG. 1 is a signal switching circuit;
FIG. 2 is a high voltage start-up circuit;
FIG. 3 is a signal isolation acceleration circuit;
FIG. 4 is a schematic diagram of topology identification;
fig. 5 is an overall flow diagram of topology transmission and identification.
Detailed Description
The present invention is further described in the following examples, which should not be construed as limiting the scope of the invention, but rather as providing the following examples which are set forth to illustrate and not limit the scope of the invention.
The signal switching circuit is directly connected between the zero line and the live line of the electric meter, as shown in figure 1. The MOS tube VT2 is connected in series with a load with fixed resistance value to generate a current signal with characteristic code bit. The circuit forms a half-wave type high-voltage direct current VIN after full-bridge rectification by VD1, VD2, VD4 and VD8, wherein RV3 is a voltage dependent resistor used for overvoltage protection, and R1, R3 and R6 are load resistors with fixed resistance values, and the intensity of a characteristic current signal is determined.
In the high voltage start-up circuit, as shown in fig. 2. After the signal switching circuit outputs high-voltage direct current VIN, the high-voltage starting circuit provides a fixed voltage drop for a grid electrode of VT1 by utilizing a clamping of VD1 and voltage division of series resistors of R1, R2, R3 and R4, and after the voltage drop meets a starting voltage of VT1, VT2 is conducted, and then VIN charges capacitors C2, C3, C4 and C5 on VCC _ TP through lines of R5, R6, R7 and R8 to obtain low-voltage direct current VCC _ TP which is used for supplying power for driving in the signal isolation accelerating circuit, wherein the C2, the C3, the C4 and the C5 are connected in parallel.
In the signal isolation accelerating circuit, as shown in fig. 3, the signal isolation accelerating circuit is driven by a PWM signal, the signal is coupled by a blocking capacitor C2 and then acts on the gate of a MOS transistor VT3, and VT3 continuously changes the level of the PWM signal, so that an optical coupler O1 on the source of VT3 generates a signal with the same level as the input signal and transmits the signal to the secondary side of O1; the driving signal output by the O1 secondary acts on the grid of the switching MOS tube VT2 after passing through the signal isolation accelerating circuit, then the VT2 simulates the on-off rule similar to a switch according to the change rule of the grid voltage, and switches a fixed load onto a power grid, so that a characteristic current signal with characteristic code bits is generated for topology identification.
The topology identification circuit is shown in fig. 4. The characteristic current signals generated by the secondary terminal are transmitted to the mutual inductor through the power line and enter the primary low-voltage Internet of things sensing terminal through the mutual inductor, AD voltage sampling is achieved through the alternating current sampling chip after the characteristic current signals pass through the sampling resistor, the sampled voltage signals are transmitted to the G55 chip through Uart serial port communication, and finally topology recognition is achieved on the characteristic current signals through the implanted topology recognition algorithm of the G55 chip.
The overall flow chart for topology identification is shown in fig. 5. The concentrator sends a topology identification command to a secondary low-voltage Internet of things sensing terminal with a topology signal sending circuit according to the address of the low-voltage Internet of things sensing terminal; after receiving a command of topology identification, the secondary low-voltage Internet of things sensing terminal utilizes a signal switching circuit in a topology signal sending circuit in a power grid to generate a current signal of a characteristic code bit and records the end time of switching a resistor; meanwhile, the low-voltage internet of things sensing terminal with alternate mining at the upper stage starts to identify and judge current signals of characteristic code bits generated on the power line, if target characteristic code bits are detected within set time, the phase of an identified list is judged according to the mean value of the current of the target characteristic code bits, and the phase identification result and the identification time are stored locally at the first-stage terminal; if the detection is not carried out within the set time, the information is not saved; the concentrator compares and finally determines the topology identification relationship by calling and measuring the switching end time of the secondary low-voltage Internet of things sensing terminal and time marks such as the identification time and the identification phase of the primary low-voltage Internet of things sensing terminal.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (6)
1. A topology sending and identifying method for a low-voltage Internet of things perception terminal is characterized by comprising the following steps: the method is established on a two-stage topology and comprises the following steps:
step 1: the concentrator sends a topology identification command to a secondary low-voltage Internet of things sensing terminal with a topology signal sending circuit according to the address of the primary low-voltage Internet of things sensing terminal;
step 2: after receiving a command of topology identification, the secondary low-voltage Internet of things sensing terminal utilizes a signal switching circuit in a topology signal sending circuit in a power grid to generate a current signal of a characteristic code bit and records the end time of switching a resistor;
and step 3: meanwhile, the low-voltage internet of things sensing terminal with alternate mining at the upper stage starts to identify and judge current signals of characteristic code bits generated on the power line, if target characteristic code bits are detected within set time, the phase of an identified list is judged according to the mean value of the current of the target characteristic code bits, and the phase identification result and the identification time are stored locally at the first-stage terminal; if the detection is not carried out within the set time, the information is not saved;
and 4, step 4: the concentrator compares and finally determines the topology identification relationship by calling and measuring the switching end time of the secondary low-voltage Internet of things sensing terminal, the identification time of the primary low-voltage Internet of things sensing terminal and the time scale of the identification phase.
2. The topology transmission and identification method of the low-voltage IOT sensing terminal according to claim 1, characterized in that: the topological signal transmitting circuit is a necessary condition that the low-voltage Internet of things sensing terminal can generate a characteristic current signal, and consists of a signal switching circuit, a high-voltage starting circuit and a signal isolation accelerating circuit, wherein the signal switching circuit is directly connected between zero and live wires of an ammeter, and a switch and a load with a fixed resistance value are connected in series to generate a current signal of a characteristic code bit; the circuit forms a half-wave type high-voltage direct current VIN after full-bridge rectification by VD1, VD2, VD4 and VD 8.
3. The topology transmission and identification method of the low-voltage internet of things sensing terminal according to claim 2, characterized in that: VIN is processed by the high-voltage starting circuit to obtain a low-voltage direct current VCC _ TP which is used for supplying power for the drive in the signal isolation accelerating circuit.
4. The topology transmission and identification method of the low-voltage IOT sensing terminal according to claim 3, characterized in that: the signal isolation accelerating circuit is driven by a PWM signal, and the MOS tube VT2 is switched continuously according to the PWM signal, so that the grid voltage is changed regularly, the on-off rule similar to a switch is simulated, and the characteristic current signal with characteristic code bits is generated.
5. The topology transmission and identification method of the low-voltage IOT sensing terminal according to claim 1, characterized in that: and finally, the receiving equipment realizes topology identification on the characteristic current signal by utilizing a self-possessed topology identification algorithm.
6. The topology transmission and identification method of the low-voltage IOT sensing terminal according to claim 1, characterized in that: after the low-voltage Internet of things sensing terminal with alternating acquisition at the upper stage detects the target characteristic code position, the phase position of the identified low-voltage Internet of things sensing terminal is judged according to the three-phase current, the identified time and the phase position identification result are stored in the local terminal, and if the characteristic current signal is not detected, no information is stored.
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Cited By (1)
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| CN114660381A (en) * | 2022-03-09 | 2022-06-24 | 南阳理工学院 | Power line branch monitoring terminal and impedance analysis method thereof |
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