A low-voltage distribution transformer area topology identification system

Abstract

The application discloses a kind of topological identification systems of low-voltage distribution transformer area, including main station, distribution transformer area, power supply line and acquisition module;Electricity meter is arranged on power supply line, acquisition module includes electricity meter and collector, the number of electricity meter and collector is multiple, single collector is connected with at least one electricity meter, and collector is used to collect electricity meter information;Distribution transformer area includes fusion terminal and distribution transformer, and fusion terminal is connected with distribution transformer, and fusion terminal is used to collect the distribution transformer information of distribution transformer;Fusion terminal is connected with at least one collector, and fusion terminal is used to collect the electricity meter information collected by the collector connected to collector;Main station is connected with fusion terminal, and main station is used to obtain the electricity meter information and distribution transformer information collected by fusion terminal, and based on electricity meter information and distribution transformer information, the topological information of electricity meter is determined. By using the above scheme, the problem that manual census is carried out to identify topology and the inspection efficiency is low, the cost is high, and the topological information cannot be accurately obtained.

Description

Technical Field

[0001] This invention relates to the technical field of power system operation monitoring, and in particular to a topology identification system for low-voltage distribution transformer areas. Background Technology

[0002] The development strategy of smart grids places higher demands on the refinement of distribution networks. Distribution transformer areas are an important component of smart distribution networks, and the topology of low-voltage distribution areas is the foundation for realizing intelligent distribution transformers. During urban redevelopment and the addition of new distribution transformer areas, changes in low-voltage distribution transformer equipment lead to alterations in the topology of these areas. Currently, establishing the topology of low-voltage distribution transformer areas, i.e., topology identification, mainly relies on manual surveys. However, the distribution of low-voltage distribution transformer lines is complex, resulting in low inspection efficiency, high costs, and the inability to accurately obtain topology information. Summary of the Invention

[0003] This invention provides a topology identification system for low-voltage distribution transformer areas to solve the problems of low efficiency, high cost, and inaccurate topology information acquisition during manual surveys for topology identification and inspection.

[0004] According to one aspect of the present invention, a topology identification system for a low-voltage transformer substation area is provided, the system comprising a master station, a transformer substation area, power supply lines, and a data acquisition module;

[0005] The electricity meter is installed on the power supply line. The data acquisition module includes an electricity meter and a data acquisition device. There are multiple electricity meters and multiple data acquisition devices. Each data acquisition device is connected to at least one electricity meter. The data acquisition device is used to collect the electricity meter information of the connected electricity meter.

[0006] The distribution transformer area includes a fusion terminal and a distribution transformer. The fusion terminal is connected to the distribution transformer and is used to collect distribution transformer information from the distribution transformer.

[0007] The fusion terminal is connected to at least one of the collectors, and the fusion terminal is used to collect the meter information collected by the connected collectors;

[0008] The master station is communicatively connected to the fusion terminal. The master station is used to acquire the meter information and the distribution transformer information collected by the fusion terminal, and to determine the topology information of the meter based on the meter information and the distribution transformer information.

[0009] In an optional embodiment of the present invention, the power supply line includes a power supply bus and power supply branches, and there are multiple power supply branches, all of which are electrically connected to the power supply bus. The electricity meter includes a sub-meter, and the sub-meter is disposed on the power supply branch.

[0010] The meter information includes meter current; the meter current includes sub-meter current and main bus current.

[0011] The master station is used to determine whether there are unread sub-meters based on the bus current collected by the collector and the sub-meter current of the meter corresponding to the collector. If so, it controls the collector to perform the step of collecting the meter information of the connected meter again.

[0012] In an optional embodiment of the present invention, the topology identification system of the low-voltage transformer substation area further includes a smart terminal, the number of transformer substation areas is multiple, and the transformer information includes transformer current;

[0013] The master station is used to determine whether there are unread meters in multiple distribution transformer areas based on the distribution transformer current and the bus current corresponding to the multiple distribution transformer areas. If so, it sends a call information to the smart terminal.

[0014] In an optional embodiment of the present invention, the transformer substation area further includes a switch and a capacitor. The transformer is connected to ground through the switch and the capacitor. The switch is used to connect the capacitor to the transformer and disconnect the capacitor from the transformer.

[0015] The fusion terminal is electrically connected to the switch and is used to control the working state of the switch;

[0016] The transformer information includes transformer voltage, and the meter information includes meter voltage.

[0017] The master station is used to control the working state of the switch to switch the capacitor when there are no unread meters in the distribution transformer area, and to determine the topology information of the meter based on the fluctuation of the distribution transformer voltage and the meter voltage.

[0018] In an optional embodiment of the present invention, the master station is used to determine whether the difference between the fluctuation of the meter voltage and the fluctuation of the distribution transformer voltage is less than a preset fluctuation threshold, and to match the meter corresponding to the meter voltage with a fluctuation difference less than the preset fluctuation threshold into the distribution transformer area, and to remove the meter corresponding to the meter voltage with a fluctuation difference not less than the preset fluctuation threshold and match it into other distribution transformer areas.

[0019] In an optional embodiment of the present invention, after the master station matches the electricity meter corresponding to the meter voltage to other distribution transformer areas, it is further configured to:

[0020] Based on the transformer current, the bus current, and the sub-meter current, determine whether the current is balanced. If not, execute the steps again to control the working state of the switch by the fusion terminal to switch the capacitor, and determine the topology information of the meter based on the fluctuation of the transformer voltage and the meter voltage.

[0021] In an optional embodiment of the present invention, there are multiple switches and capacitors, and they are connected in a one-to-one correspondence. Before the main station controls the working state of the switches to switch the capacitors in the fusion terminal, it is further configured to:

[0022] Determine whether all capacitors are switched on or off. If not, execute the step of controlling the working state of the switch by the fusion terminal to switch the capacitors on or off. If yes, send check information to the smart terminal.

[0023] In an optional embodiment of the present invention, the meter information includes a meter number, and the master station is also used to obtain user information and associate it with the meter number.

[0024] In an optional embodiment of the present invention, the electricity meter includes a master meter, which is disposed on the power supply bus and is used to obtain the bus current.

[0025] In an optional embodiment of the present invention, the topology identification system of the low-voltage distribution transformer area further includes at least one of a current transformer and a voltage transformer, wherein at least one of the current transformer and the voltage transformer is disposed on the power supply bus, the current transformer is used to detect the bus current, and the voltage transformer is used to detect the bus voltage.

[0026] The data acquisition unit is electrically connected to at least one of the current transformer and the voltage transformer, and is used to acquire the bus current and / or the bus voltage.

[0027] The technical solution of this invention, through the setup of a master station, distribution transformer areas, power supply lines, and acquisition modules, enables a data collector to acquire meter information from connected electricity meters. A fusion terminal then acquires the meter information collected by the data collector, and simultaneously acquires distribution transformer information. Finally, the master station obtains the meter and distribution transformer information acquired by the fusion terminal and determines the meter's topology information based on this information. Thus, the master station can automatically determine the meter's topology information using the meter and distribution transformer information, eliminating the need for manual surveys and solving the problems of low efficiency, high cost, and inaccurate topology information acquisition associated with manual topology identification and inspection.

[0028] It should be understood that the description in this section is not intended to identify key or essential features of the embodiments of the present invention, nor is it intended to limit the scope of the invention. Other features of the invention will become readily apparent from the following description. Attached Figure Description

[0029] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0030] Figure 1 This is a schematic diagram of the topology identification system for a low-voltage distribution transformer area provided in Embodiment 1 of the present invention;

[0031] Figure 2 This is a schematic diagram of the structure of a distribution transformer area in a topology identification system for a low-voltage distribution transformer area provided in Embodiment 2 of the present invention.

[0032] The components are: 1. Main station; 2. Distribution transformer area; 21. Integrated terminal; 22. Distribution transformer; 23. Switch; 24. Capacitor; 3. Data acquisition module; 31. Electricity meter; 32. Data acquisition device; 4. Smart terminal. Detailed Implementation

[0033] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0034] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0035] Example 1

[0036] Figure 1 This is a schematic diagram of a topology identification system for a low-voltage distribution transformer area provided in Embodiment 1 of the present invention. The topology identification system for the low-voltage distribution transformer area includes a main station 1, a distribution transformer area 2, a power supply line (not shown in the figure), and a data acquisition module 3.

[0037] The electricity meter 31 is installed on the power supply line. The data acquisition module 3 includes multiple electricity meters 31 and multiple data collectors 32. Each data collector 32 is connected to at least one electricity meter 31 and is used to collect the electricity meter information of the connected electricity meter 31. The power supply line refers to the line used to transmit electrical energy to electrical equipment. For example, when the power supply line supplies power to a residential area, this power supply line is the mains power to the user's home. The electricity meter 31 is a device used to record the active power consumed by electrical equipment on its power supply line. Specifically, the electricity meter 31 can be any of a three-phase smart meter, a three-phase three-wire multi-function meter, or a three-phase four-wire multi-function meter. The data collector 32 is an automated device with real-time data acquisition and processing capabilities. It has real-time acquisition, automatic storage, instant display, instant feedback, automatic processing, and automatic transmission functions. This ensures the authenticity, validity, real-time performance, and availability of the on-site data. By connecting the data collector 32 to the electricity meter 31, the data collector 32 can collect the electricity meter information through the meter protocol. In one specific embodiment, the data collector 32 communicates with the electricity meter 31 via 485.

[0038] Distribution transformer area 2 includes a converged terminal 21 and a distribution transformer 22. The converged terminal 21 is connected to the distribution transformer 22 and is used to collect distribution transformer information from the distribution transformer 22. The converged terminal 21 refers to a new type of user terminal derived from the convergence of fixed and mobile systems (FMC) at the terminal side. The distribution transformer, abbreviated as "distribution transformer 22," is a static electrical device in a power distribution system that transmits AC power by transforming AC voltage and current according to the law of electromagnetic induction. That is, a single distribution transformer 22 can supply power to multiple power lines. Distribution transformer information may include transformer voltage and transformer current, among other information.

[0039] The fusion terminal 21 is connected to at least one data collector 32. The fusion terminal 21 is used to collect meter information collected by the connected data collector 32. The meter 31 corresponding to the data collector 32 connected to the fusion terminal 21 is the meter 31 belonging to the distribution transformer area 2. Because the fusion terminal 21 is connected to the data collector 32, it can collect the meter information collected by the data collector 32. In a specific embodiment, the fusion terminal 21 and the data collector 32 transmit data via low-voltage carrier or small wireless communication. The meter information may include meter current, meter number, meter voltage, etc.

[0040] The master station 1 is connected to the fusion terminal 21. The master station 1 is used to obtain the meter information and distribution transformer information collected by the fusion terminal 21, and to determine the topology information of the meter 31 based on the meter information and distribution transformer information.

[0041] The topology information reflects which distribution transformer area 2 the meter 31 belongs to. Since all power supply lines in the same distribution transformer area 2 are powered by distribution transformer 22, and the meter 31 in that area can supply power to the power consumed by the power lines, the meter information and distribution transformer information have a certain correlation. Therefore, by integrating the meter information and distribution transformer information collected by the fusion terminal 21, the topology information of the meter 31 can be determined.

[0042] The above scheme, by setting up a main station 1, distribution transformer area 2, power supply lines, and acquisition module 3, allows the acquisition device 32 to collect meter information from connected meters 31. The fusion terminal 21 then collects the meter information collected by the acquisition device 32 and the distribution transformer information from distribution transformer 22. Finally, the main station 1 obtains the meter and distribution transformer information collected by the fusion terminal 21 and determines the topology information of meter 31 based on this information. Thus, the main station 1 can automatically determine the topology information of meter 31 using the meter and distribution transformer information, eliminating the need for manual surveys. This solves the problems of low efficiency, high cost, and inaccurate topology information acquisition associated with manual topology identification and inspection. It is applicable to distribution automation systems requiring topology identification of distribution transformer area 2 and can be used to guide power system operation monitoring.

[0043] In an optional embodiment of the present invention, the main station 1 may include a front-end processor, a server, a workstation, a switch, a router, wireless communication equipment, etc., thereby enabling convenient wireless communication with the converged terminal 21. For example, the converged terminal 21 can upload the collected data to the front-end processor of the main station 1 via 4G or 5G networks. 4G networks require secure access, while 5G forms a private network through slicing technology.

[0044] In an optional embodiment of the present invention, the power supply line includes a power supply bus and power supply branches, and there are multiple power supply branches, all of which are electrically connected to the power supply bus. The meter 31 includes a sub-meter, which is set on the power supply branch. The meter information includes the meter current. The meter current includes the sub-meter current and the bus current. The master station 1 is used to determine whether there is an unread sub-meter based on the bus current collected by the collector 32 and the sub-meter current of the meter 31 corresponding to the collector 32. If so, the master station 1 controls the collector 32 to perform the step of collecting the meter information of the connected meter 31 again.

[0045] Since all power supply branches are connected to the power supply bus, the sum of the currents of all power supply branches connected to the power supply bus should equal the current of the power supply bus. The sub-meter current is the current value of the corresponding power supply branch, and the bus current is the current value on the power supply bus. Unread sub-meters refer to meters 31 for which the data collector 32 has not collected meter information. Determining whether there are unread sub-meters based on the bus current collected by the data collector 32 and the sub-meter current of the corresponding meter 31 can be done by checking if the bus current is equal to the sum of all sub-meter currents. If they are equal, it means the data collector 32 has collected meter information from all meters 31 electrically connected to it; if they are not equal, it means there are unread sub-meters. In this case, controlling the data collector 32 to re-execute the step of collecting meter information from the connected meters 31 can avoid data omissions.

[0046] Based on the above embodiments, there are multiple ways to collect bus current. For example, in one specific embodiment, the meter 31 includes a master meter, which is installed on the power supply bus to obtain the bus current. The master meter is the meter 31 installed on the power supply bus, and the collector 32 only needs to communicate with the master meter to obtain the bus current.

[0047] In another optional embodiment, the topology identification system for the low-voltage transformer substation area also includes a current transformer (not shown in the figure). The current transformer is installed on the power supply bus and is used to detect the bus current. The data acquisition unit 32 is electrically connected to the current transformer to acquire the bus current. The current transformer is an instrument that measures the bus current by converting a large primary current into a small secondary current based on the principle of electromagnetic induction. By using a current transformer, the data acquisition unit 32 can easily acquire the bus current.

[0048] In another optional embodiment, the topology identification system for the low-voltage transformer substation area also includes a voltage transformer (not shown in the figure). The voltage transformer is installed on the power supply bus and is used to detect the bus voltage. The data acquisition unit 32 is electrically connected to the voltage transformer to obtain the bus voltage. The voltage transformer (Potential Transformer, abbreviated as PT, Voltage Transformer, abbreviated as VT), similar to a transformer, is an instrument used to transform voltage. The purpose of the voltage transformer is mainly to power measuring instruments and relay protection devices, used to measure the voltage, power, and energy of the line. Therefore, the data acquisition unit 32 can easily obtain the bus voltage through the voltage transformer.

[0049] In an optional embodiment of the present invention, the topology identification system for low-voltage transformer substations further includes a smart terminal 4. The number of transformer substations 2 is multiple, and the transformer information includes transformer current. The master station 1 is used to determine whether there are unread meters 31 in the multiple transformer substations 2 based on the transformer current and bus current corresponding to the multiple transformer substations 2. If so, it sends a call information to the smart terminal 4.

[0050] Among them, the transformer current refers to the output current of transformer 22, the intelligent terminal 4 refers to a terminal capable of measurement and control functions, which can be a handheld terminal used by staff, and the call information refers to information indicating that staff need to manually check. Specifically, the intelligent terminal 4 can communicate directly with the fusion terminal 21 and the data collector 32, and can correct some error information on site. It can also manually read unread meters 31. At the same time, the intelligent terminal 4 can also communicate with the master station 1, and thus modify the information in the master station 1. For example, the intelligent terminal 4 can send signals wirelessly, and then transmit them to the master station 1 through a communication tower.

[0051] For all transformer substations 2 and meters 31, even if the transformer substation 2 to which meter 31 belongs is faulty, the sum of the currents in all transformer substations 2 should be equal to the sum of the currents in all meters 31. Therefore, determining whether there are unread meters 31 in multiple transformer substations 2 based on the transformer current and bus current corresponding to multiple transformer substations 2 can be done by checking whether the sum of all transformer currents is equal to the sum of all bus currents. If they are equal, it means there are no unread meters 31; if they are not equal, it means there are unread meters 31. When there are unread meters 31, a recall message is sent to the smart terminal 4, so that staff can manually check them on-site.

[0052] Furthermore, the data collector 32 and the fusion terminal 21 can communicate via a carrier wave. Therefore, the connectivity status of the data collector 32 and the fusion terminal 21 can be determined based on the carrier communication connectivity status. Then, the step of determining whether there are unread meters 31 in multiple distribution transformer areas 2 based on the distribution transformer current and bus current corresponding to multiple distribution transformer areas 2 can be performed. If so, the call information is sent to the smart terminal 4. This can avoid the situation where data is not read due to communication failure, and thus information is mistakenly sent to the smart terminal 4.

[0053] Example 2

[0054] Figure 2 This is a schematic diagram of the distribution transformer area structure of a topology identification system for a low-voltage distribution transformer area provided in Embodiment 2 of the present invention. This embodiment improves upon Embodiment 1. Figure 1 and Figure 2 As shown, the transformer substation area 2 also includes a switch 23 and a capacitor 24. The transformer 22 is connected to ground through the switch 23 and the capacitor 24. The switch 23 is used to connect the capacitor 24 to the transformer 22 and disconnect the capacitor 24 from the transformer 22.

[0055] The fusion terminal 21 is electrically connected to the switch 23 and is used to control the working state of the switch 23.

[0056] Distribution transformer information includes distribution transformer voltage, and meter information includes meter voltage.

[0057] When there are no unread meters 31 in the distribution transformer area 2, the main station 1 controls the working state of the control switch 23 of the fusion terminal 21 to switch the capacitor 24, and determines the topology information of the meter 31 based on the fluctuation of the distribution transformer voltage and the meter voltage.

[0058] In this context, the transformer voltage refers to the voltage output by transformer 22, and the meter voltage refers to the voltage of the line where meter 31 is located. It can be seen that since switch 23 is on the line connecting capacitor 24 and transformer 22, switch 23 can control capacitor 24 to connect to transformer 22, and can also disconnect capacitor 24 from transformer 22. When capacitor 24 is connected, transformer 22 is grounded through capacitor 24, causing a change in the voltage of transformer 22, resulting in corresponding fluctuations in transformer voltage. When transformer voltage fluctuates, theoretically, the meter voltage of meter 31 in transformer substation 2, where transformer 22 is located, will fluctuate synchronously, meaning the difference in fluctuation between the two is small. Therefore, by switching capacitor 24 to cause voltage fluctuations, the topology information of meter 31 can be determined based on the fluctuations of transformer voltage and meter voltage.

[0059] In an optional embodiment of the present invention, the master station 1 is used to determine whether the difference between the fluctuation of the meter voltage and the fluctuation of the distribution transformer voltage is less than a preset fluctuation threshold, and to match the meter 31 corresponding to the meter voltage with a fluctuation difference less than the preset fluctuation threshold into the distribution transformer area 2, and to remove the meter 31 corresponding to the meter voltage with a fluctuation difference not less than the preset fluctuation threshold and match it into other distribution transformer areas 2.

[0060] Due to varying measurement accuracies, even synchronous fluctuations will exhibit some differences, though these differences are relatively small. A preset fluctuation threshold reflects a certain range of these differences. When the difference between the meter voltage fluctuation and the distribution transformer voltage fluctuation is less than the preset fluctuation threshold, it indicates that the meter voltage fluctuates synchronously with the distribution transformer voltage. Since the meter voltage reflects the voltage of a specific meter 31, this indicates that meter 31 belongs to distribution transformer area 2. Therefore, meters 31 with fluctuation differences less than the preset fluctuation threshold can be matched into distribution transformer area 2, while meters 31 with fluctuation differences not less than the preset fluctuation threshold can be removed and matched into other distribution transformer areas 2, thus determining the topology information of meter 31.

[0061] Based on the above embodiments, after the main station 1 matches the meter 31 corresponding to the meter voltage to other distribution transformer areas 2, it is also used for:

[0062] Based on the distribution transformer current, bus current, and sub-meter current, determine whether the current is balanced. If not, execute the steps of controlling the working state of the control switch 23 of the control fusion terminal 21 to switch the capacitor 24, and determine the topology information of the meter 31 based on the fluctuation of the distribution transformer voltage and the meter voltage.

[0063] When the topology information of meter 31 is correct, the current is in a balanced state. At this time, the transformer current of each distribution transformer area 2 should be equal to the sum of all bus currents collected by all collectors 32 connected to the fusion terminal 21 of that distribution transformer area. Each bus current should also be equal to the sum of the sub-meter currents detected by meter 31 on the power supply branch line connected to that power supply bus. When balanced, the current topology identification process can end. If the current is unbalanced, it indicates that the topology information is still incorrect. In this case, switching capacitor 24 again causes voltage fluctuations, allowing the topology information of meter 31 to be determined again based on the voltage fluctuations, thus making the topology information of meter 31 more accurate.

[0064] In an optional embodiment of the present invention, there are multiple switches 23 and capacitors 24, and they are connected in a one-to-one correspondence. Before the main station 1 controls the working state of the switch 23 to switch the capacitors 24, it is also used to: determine whether all capacitors 24 are switched. If not, execute the step of controlling the working state of the switch 23 to switch the capacitors 24. If yes, send the check information to the smart terminal 4.

[0065] Since there are multiple capacitors 24, the voltage fluctuations vary depending on the switching of different capacitors 24 and their switching states. Therefore, by switching different capacitors 24 multiple times, the distribution area to which the meter 31 belongs can be located more accurately. If the current still cannot be balanced after all capacitors 24 have been switched, it indicates that there may be a line fault. Therefore, a check message is sent to the smart terminal 4, which instructs the smart terminal 4 to perform a line check. This allows staff to more accurately determine the topology information of the meter 31 even when dealing with line faults.

[0066] The following specific implementation illustrates the topology identification process. The master station 1 first acquires meter information and distribution transformer information. Meter information includes meter current and meter voltage; meter current includes sub-meter current and bus current. Distribution transformer information includes distribution transformer current and distribution transformer voltage. Then, it determines the connectivity between the fusion terminal 21 and the data collector 32. When both are connected, it checks if the bus current equals the sum of the corresponding sub-meter currents. If yes, it indicates that the data collector 32 has no unread meters 31. If not, the data collector 32 acquires meter information again to prevent any meters 31 from being missed. Then, it checks if the sum of all distribution transformer currents equals the sum of all sub-meter currents. If yes, it indicates that there are no unread meters 31. If not, it sends a recall message to the smart terminal 4.

[0067] When there are no unread meters 31, the control fusion terminal 21 controls the working state of the control switch 23 to switch capacitors 24, determines whether the difference between the fluctuation of the meter voltage and the fluctuation of the distribution transformer voltage is less than a preset fluctuation threshold, and matches the meters 31 corresponding to the meter voltage with a fluctuation difference less than the preset fluctuation threshold to the distribution transformer area 2, and removes the meters 31 corresponding to the meter voltage with a fluctuation difference not less than the preset fluctuation threshold and matches them to other distribution transformer areas 2. Then, it determines whether the current is balanced based on the distribution transformer current, bus current and sub-meter current. If balanced, the process ends. If not, it determines whether all capacitors 24 are switched. If not, it executes the step of controlling the working state of the control fusion terminal 21 to switch capacitors 24. If so, it sends the check information to the smart terminal 4. When the voltage of distribution transformer 22 fluctuates, theoretically the meter voltage of the meter 31 in the distribution transformer area 2 where distribution transformer 22 is located will fluctuate synchronously, that is, the difference between the fluctuations of the two is small. Therefore, by switching capacitor 24 to cause voltage fluctuation, the topology information of meter 31 can be determined based on the fluctuation of distribution transformer voltage and meter voltage.

[0068] In an optional embodiment of the present invention, the meter information includes the meter number, and the main station 1 is also used to obtain user information and associate it with the meter number. The user information may include user characteristic information, user account number, and the power supply circuit to which the user belongs. This enables the statistical analysis of each user's electricity consumption, which is then stored in the main station 1. It should be understood that various forms of the process described above can be used, with steps reordered, added, or deleted. For example, the steps described in this invention can be executed in parallel, sequentially, or in different orders, as long as the desired result of the technical solution of this invention can be achieved; no limitation is imposed herein.

[0069] The specific embodiments described above do not constitute a limitation on the scope of protection of this invention. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this invention should be included within the scope of protection of this invention.

Claims

1. A topology identification system for a low-voltage distribution transformer area, characterized in that, Includes main station (1), distribution transformer area (2), power supply line and data acquisition module (3); The data acquisition module (3) includes an electricity meter (31) and a data collector (32). The electricity meter (31) is installed on the power supply line. There are multiple electricity meters (31) and multiple data collectors (32). Each data collector (32) is connected to at least one electricity meter (31). The data collector (32) is used to collect the electricity meter information of the connected electricity meter (31). The distribution transformer area (2) includes a fusion terminal (21) and a distribution transformer (22). The fusion terminal (21) is connected to the distribution transformer (22). The fusion terminal (21) is used to collect the distribution transformer information of the distribution transformer (22). The fusion terminal (21) is connected to at least one of the collectors (32), and the fusion terminal (21) is used to collect the meter information collected by the connected collector (32); The master station (1) is communicatively connected to the fusion terminal (21). The master station (1) is used to obtain the meter information and the distribution transformer information collected by the fusion terminal (21), and to determine the topology information of the meter (31) based on the meter information and the distribution transformer information. The power supply line includes a power supply bus and power supply branches. There are multiple power supply branches, and all of them are electrically connected to the power supply bus. The meter (31) includes a sub-meter, which is set on the power supply branch. The meter information includes meter current; the meter current includes sub-meter current and main bus current. The master station (1) is used to determine whether there is an unread sub-meter based on the bus current collected by the collector (32) and the sub-meter current of the meter (31) corresponding to the collector (32). If so, it controls the collector (32) to perform the step of collecting the meter information of the connected meter (31) again. The transformer information includes transformer voltage, and the meter information includes meter voltage. The master station (1) is used to determine whether the difference between the fluctuation of the meter voltage and the fluctuation of the distribution transformer voltage is less than a preset fluctuation threshold, and to match the meter (31) corresponding to the meter voltage with a fluctuation difference less than the preset fluctuation threshold into the distribution transformer area (2), and to remove the meter (31) corresponding to the meter voltage with a fluctuation difference not less than the preset fluctuation threshold and match it into other distribution transformer areas (2).

2. The topology identification system for low-voltage distribution transformer areas according to claim 1, characterized in that, The topology identification system of the low-voltage transformer substation also includes a smart terminal (4), and there are multiple transformer substations (2). The transformer information includes transformer current. The master station (1) is used to determine whether there are unread meters (31) in the multiple distribution transformer areas (2) based on the distribution transformer current and the bus current corresponding to the multiple distribution transformer areas (2). If so, it sends a call information to the smart terminal (4).

3. The topology identification system for low-voltage distribution transformer areas according to claim 2, characterized in that, The transformer substation area (2) also includes a switch (23) and a capacitor (24). The transformer (22) is connected to ground through the switch (23) and the capacitor (24). The switch (23) is used to connect the capacitor (24) to the transformer (22) and disconnect the capacitor (24) from the transformer (22). The fusion terminal (21) is electrically connected to the switch (23) and is used to control the working state of the switch (23); The master station (1) is used to control the working state of the switch (23) to switch the capacitor (24) when there is no unread meter (31) in the distribution transformer area (2), and to determine the topology information of the meter (31) based on the fluctuation of the distribution transformer voltage and the meter voltage.

4. The topology identification system for low-voltage distribution transformer areas according to claim 3, characterized in that, After the main station (1) matches the electricity meter (31) corresponding to the meter voltage to other distribution transformer areas (2), it is also used for: Based on the transformer current, the bus current and the sub-meter current, determine whether the current is balanced. If not, execute the steps of controlling the working state of the switch (23) to switch the capacitor (24) again by controlling the fusion terminal (21), and determining the topology information of the meter (31) based on the fluctuation of the transformer voltage and the meter voltage.

5. The topology identification system for low-voltage distribution transformer areas according to any one of claims 3 to 4, characterized in that, The number of switches (23) and capacitors (24) are both multiple and connected in a one-to-one correspondence. Before the main station (1) controls the fusion terminal (21) to control the working state of the switches (23) to switch the capacitors (24), it is also used for: Determine whether all capacitors (24) are switched on or off. If not, execute the step of controlling the working state of the switch (23) of the fusion terminal (21) to switch on or off the capacitors (24). If yes, send the check information to the smart terminal (4).

6. The topology identification system for low-voltage distribution transformer areas according to any one of claims 1 to 4, characterized in that, The meter information includes the meter number, and the master station (1) is also used to obtain user information and associate it with the meter number.

7. The topology identification system for low-voltage distribution transformer areas according to any one of claims 1 to 4, characterized in that, The meter (31) includes a master meter, which is set on the power supply bus and is used to obtain the bus current.

8. The topology identification system for low-voltage distribution transformer areas according to any one of claims 1 to 4, characterized in that, The topology identification system of the low-voltage distribution transformer area also includes at least one of a current transformer and a voltage transformer. At least one of the current transformer and the voltage transformer is installed on the power supply bus. The current transformer is used to detect the bus current, and the voltage transformer is used to detect the bus voltage. The data acquisition unit (32) is electrically connected to at least one of the current transformer and the voltage transformer to acquire the bus current and / or the bus voltage.

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