CN113572262B - Topology sending and identifying method of low-voltage internet of things sensing terminal - Google Patents
Topology sending and identifying method of low-voltage internet of things sensing terminal Download PDFInfo
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- CN113572262B CN113572262B CN202110804094.8A CN202110804094A CN113572262B CN 113572262 B CN113572262 B CN 113572262B CN 202110804094 A CN202110804094 A CN 202110804094A CN 113572262 B CN113572262 B CN 113572262B
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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
-
- 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
-
- 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
-
- 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 internet of things sensing terminal, which comprises the following steps that step 1, a concentrator sends a topology identifying command to a secondary low-voltage internet of things sensing terminal capable of generating a current signal of a feature code bit; step 2, the secondary low-voltage internet of things sensing terminal generates a characteristic current signal by utilizing an internal topology signal transmitting circuit, transmits the characteristic current signal to the primary low-voltage internet of things sensing terminal at a specific time, and records the signal switching ending time; step 3, the primary low-voltage internet of things sensing terminal recognizes current signals on the power grid by utilizing the self-collection function, and if yes, the switching time is saved; and 4, the concentrator finally locates the topological relation by calling 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 transmitting circuit on the low-voltage internet of things sensing terminal, and can acquire a topology identification framework for monitoring the whole 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 to intelligent and transparent power grid construction, however, the quantity of low-voltage resident users is huge, the distribution range is wide, a series of electricity utilization problems are caused, for example, the self-identification sensing capability of a power line is poor, transformers in the same power distribution room are in disorder due to the fact that the installation is relatively close, the attribution of the electricity utilization users cannot be determined finally, when the problems of abnormal line loss, safety faults and the like occur, a large amount of manpower and material resources are required to be consumed for checking and positioning, the operation and maintenance cost is relatively high, the efficiency is low, even illegal molecules use the phenomenon that the holes steal the national electric quantity, at the moment, a topology identification framework capable of monitoring the whole area is required to be constructed, a plurality of new technologies of topology identification are caused due to the rapid development of carrier technology, however, communication modes such as micro-power wireless and the like on the low-voltage power line are in a common zero mode and a coupling condition, the cross-area communication and reading phenomenon are caused, the identification success rate is not high, great challenges are brought to topology identification, and the intelligent power construction in the future becomes important direction of how to acquire a precise topology relation between the transformers and the electric meter users.
Disclosure of Invention
The invention aims to solve the technical problems in the prior art and provides a topology sending and identifying method of a low-voltage internet of things sensing terminal to accurately realize the topology relation among a power supply transformer, terminal equipment and a user. According to the scheme, low-voltage internet of things sensing terminal equipment is used as a carrier, a characteristic current signal is generated through a topology signal transmitting circuit of a secondary low-voltage internet of things sensing terminal, and a main chip with a topology identification algorithm in a primary low-voltage internet of things sensing terminal is used for identifying the characteristic current signal.
In order to achieve the above purpose, the present invention provides the following technical solutions: a topology sending and identifying method of a low-voltage 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 topology identification command, the secondary low-voltage internet of things sensing terminal uses a signal switching circuit in a topology signal sending circuit to generate a current signal of a characteristic code bit in a power grid, and records the ending time of resistance switching;
step 3: meanwhile, the low-voltage internet of things sensing terminal with the cross mining at the upper stage starts to identify and judge the current signal of the characteristic code bit generated on the power line, if the target characteristic code bit is detected within the set time, the phase of the identified table is judged according to the average value of the current of the target characteristic code bit, and the phase identification result and the identification time are stored in the local of the first-stage terminal; if the information is not detected within the set time, the information is not stored;
step 4: the concentrator compares and finally determines the topology identification relationship by calling 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, the identification phase and other time marks.
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 fire wires of an ammeter, and a switch and a load with a fixed resistance value are connected in series to generate a current signal with a characteristic code position; the circuit forms a half-wave high-voltage direct current VIN after full-bridge rectification of 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 accelerator circuit.
Furthermore, the signal isolation accelerating circuit is driven by adopting a PWM signal, and the MOS tube VT2 is continuously switched according to the height of the PWM signal, so that the grid voltage is regularly changed, the on-off rule similar to a switch is simulated, and a characteristic current signal with characteristic code bits is generated.
Further, the characteristic current signal generated in the secondary low-voltage internet of things sensing terminal is transmitted to the receiving equipment of the primary low-voltage internet of things sensing terminal through the power line, and finally the receiving equipment utilizes the topology identification algorithm of the receiving equipment to realize topology identification on the characteristic current signal.
Further, after the last-stage low-voltage internet of things sensing terminal with cross mining detects the target feature code bit, judging the phase of the identified low-voltage internet of things sensing terminal according to the size of the three-phase current, storing the identified time and phase identification result in the terminal local, and if no feature current signal is detected, not storing any information.
The beneficial effects of the invention are as follows:
according to the topology sending and identifying method of the low-voltage internet of things sensing terminal, the concentrator sends the command of topology identification to the second-level low-voltage internet of things sensing terminal through the carrier channel, the second-level low-voltage internet of things sensing terminal sends the characteristic small current signal at a specific time after receiving the command, meanwhile, the first-level low-voltage internet of things sensing terminal identifies the current signal on the power grid by utilizing the self-exchange function, and finally locates the topology relation by calling the switching end time, the identification time and the identification phase of the two-level low-voltage internet of things sensing terminal, so that a topology identification framework for monitoring the whole 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 chart of topology transmission and identification.
Detailed Description
The invention will now be further described with reference to the following examples, which are given solely for the purpose of illustration and are not to be construed as limitations on the scope of the invention, as will be apparent to those skilled in the art upon examination of the foregoing disclosure.
The signal switching circuit is directly connected between the zero line and the fire line of the ammeter, as shown in figure 1. And connecting the MOS tube VT2 and a load with a fixed resistance value in series to generate a current signal of the characteristic code bit. After full-bridge rectification of VD1, VD2, VD4 and VD8, the circuit forms a half-wave high-voltage direct current VIN, wherein RV3 is a piezoresistor used as overvoltage protection, and R1, R3 and R6 are used as load resistors with fixed resistance values, which determine the intensity of characteristic current signals.
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 the grid electrode of VT1 by utilizing the voltage division of the serial resistors of the clamp of VD1 and R1, R2, R3 and R4, and when the voltage drop meets the starting voltage of VT1, VT2 is conducted, VIN is charged through the lines of R5, R6, R7 and R8 to obtain low-voltage direct current VCC_TP for driving power supply in the signal isolation accelerating circuit, wherein the lines of C2, C3, C4 and C5 are connected in parallel.
In the signal isolation accelerating circuit, as shown in fig. 3, a PWM signal is adopted for driving, the signal is coupled through a blocking capacitor C2 and then acts on the grid electrode of a MOS tube VT3, and the VT3 enables an optical coupler O1 on the source electrode of the VT3 to generate a signal with the same height as the input signal and transmit the signal to the secondary electrode of the O1 through continuous change of the height of the PWM signal; the driving signal output by the O1 secondary stage acts on the grid electrode 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 electrode voltage, and a fixed load is switched on 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 signal generated by the secondary terminal is transmitted to the transformer through a power line and enters the primary low-voltage internet-of-things sensing terminal through the transformer, AD voltage sampling is realized through the alternating sampling chip after passing through the sampling resistor, the sampled voltage signal is transmitted to the G55 chip through the Uart serial port communication, and finally the G55 chip realizes topology identification on the characteristic current signal by utilizing an implanted topology identification algorithm.
An overall flow chart of 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 topology identification command, the secondary low-voltage internet of things sensing terminal uses a signal switching circuit in a topology signal sending circuit to generate a current signal of a characteristic code bit in a power grid, and records the ending time of resistance switching; meanwhile, the low-voltage internet of things sensing terminal with the cross mining at the upper stage starts to identify and judge the current signal of the characteristic code bit generated on the power line, if the target characteristic code bit is detected within the set time, the phase of the identified table is judged according to the average value of the current of the target characteristic code bit, and the phase identification result and the identification time are stored in the local of the first-stage terminal; if the information is not detected within the set time, the information is not stored; the concentrator compares and finally determines the topology identification relationship by calling 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, the identification phase and other time marks.
Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (4)
1. A topology sending and identifying method of a low-voltage internet of things sensing terminal is characterized by comprising the following steps of: the method is based 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 topology identification command, the secondary low-voltage internet of things sensing terminal uses a signal switching circuit in a topology signal sending circuit to generate a current signal of a characteristic code bit in a power grid, and records the ending time of resistance switching;
step 3: meanwhile, the low-voltage internet of things sensing terminal with the cross mining at the upper stage starts to identify and judge the current signal of the characteristic code bit generated on the power line, if the target characteristic code bit is detected within the set time, the phase of the identified table is judged according to the average value of the current of the target characteristic code bit, and the phase identification result and the identification time are stored in the local of the first-stage terminal; if the information is not detected within the set time, the information is not stored;
the characteristic current signals generated in the secondary low-voltage internet of things sensing terminal are transmitted to receiving equipment of the primary low-voltage internet of things sensing terminal through a power line, and finally the receiving equipment utilizes a topology identification algorithm of the receiving equipment to realize topology identification on the characteristic current signals;
after the last-stage low-voltage internet of things sensing terminal with cross mining detects the target characteristic code bit, judging the phase of the identified low-voltage internet of things sensing terminal according to the magnitude of three-phase current, storing the identified time and phase identification result in the local of the terminal, and if no characteristic current signal is detected, not storing any information;
step 4: the concentrator compares and finally determines the topology identification relationship by calling the switching end time of the secondary low-voltage internet of things sensing terminal and the identification time and the identification phase time mark of the primary low-voltage internet of things sensing terminal.
2. The topology transmission and identification method of the low-voltage internet of things sensing terminal according to claim 1, wherein the topology transmission and identification method is characterized by comprising the following steps: 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 fire wires of an ammeter, and a switch and a load with a fixed resistance value are connected in series to generate the current signal of a characteristic code bit; the circuit forms a half-wave high-voltage direct current VIN after full-bridge rectification of 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, wherein the topology transmission and identification method is characterized by comprising the following steps: VIN is passed through the high-voltage starting circuit to obtain a low-voltage direct current VCC_TP for supplying power for driving in the signal isolation accelerating circuit.
4. The topology transmission and identification method of the low-voltage internet of things sensing terminal according to claim 3, wherein the topology transmission and identification method is characterized by comprising the following steps: the signal isolation accelerating circuit is driven by adopting a PWM signal, and the MOS tube VT2 is continuously switched according to the PWM signal, so that the grid voltage is regularly changed, the on-off rule similar to a switch is simulated, and a characteristic current signal with characteristic code bits is generated.
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| CN108173425A (en) * | 2018-02-26 | 2018-06-15 | 广州金升阳科技有限公司 | A kind of start-up circuit |
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