Low-voltage substation heavy overload judgment and positioning method, device, medium and equipment

Abstract

The present invention discloses a method, device, medium and equipment for judging and locating heavy overload in a low-voltage power distribution area. First, current load data of different levels such as substation transformers, branches, and users in the low-voltage power distribution area are obtained. Then, the current load intervals during heavy load and overload are calculated and compared with the current load data of the substation transformer to preliminarily judge the heavy overload situation. Then, verification is carried out according to the current load data of the branches and users. If it is confirmed that there is heavy load or overload, further precise positioning is carried out according to the load data of the branches and users to determine the specific heavy overload branches and users, thus realizing the timely and accurate judgment and location of the heavy overload situation in the low-voltage power distribution area and effectively improving the stability and operation efficiency of the power system.

Description

Technical Field

[0001] The present invention relates to the technical field of low - voltage power distribution areas, and particularly to a method, device, medium and equipment for judging and locating heavy overload in low - voltage power distribution areas. Background Technique

[0002] With the acceleration of the urbanization process, the improvement of industrialization level and the increase of power consumption load, heavy overload in power distribution areas has become an important problem in the power system. The large - scale installation and use of household appliances such as home equipment, air conditioners, water heaters, refrigerators, etc., as well as the continuous increase in the demand for power supply in industrial production, have led to a rapid growth in power demand. However, due to the long investment and construction cycle of newly built power plants and power transmission and transformation facilities, and the lag of infrastructure construction in some areas, the supporting power transmission and transformation lines cannot be built in time, resulting in the lag of power supply capacity behind the growth of power demand, and thus heavy overload phenomena occur frequently.

[0003] And due to reasons such as the long - term lack of maintenance of the low - voltage distribution network, insufficient attention to the load of key power distribution areas, and the main judgment of heavy overload being carried out in the cloud, it is impossible to complete the judgment and location of heavy overload in a timely and accurate manner, further exacerbating the frequent occurrence of heavy overload in low - voltage power distribution areas. Summary of the Invention

[0004] Based on this, it is necessary to provide a method, device, medium and equipment for judging and locating heavy overload in low - voltage power distribution areas to solve the problem of being unable to complete the judgment and location of heavy overload in a timely and accurate manner.

[0005] A method for judging and locating heavy overload in a low - voltage power distribution area, the method includes:

[0006] Obtain the current load data at each monitoring point under different levels of the low - voltage power distribution area; wherein, the levels of the low - voltage power distribution area include the sub - station transformer, branch and user levels which are refined in sequence;

[0007] Calculate the first current load interval during heavy load and the second current load interval during overload in the low - voltage power distribution area, compare the current load data of the sub - station transformer with the first current load interval and the second current load interval, and determine the preliminary judgment result of heavy overload in the low - voltage power distribution area according to the comparison result;

[0008] Verify the preliminary judgment result of heavy overload according to the current load data of the branch and the user;

[0009] If the verification result is that there is heavy load or overload in the low - voltage power distribution area, locate the heavy overload at the branch level according to the magnitudes of the current load data of all branches to determine the heavy - overload branch, and locate the heavy overload at the user level according to the magnitudes of the current load data of all users under the heavy - overload branch to determine the heavy - overload user.

[0010] In one embodiment, calculating the first current load range during heavy load and the second current load range during overload of the low-voltage power distribution area includes:

[0011] Obtain the rated capacity, turns ratio, output voltage of the distribution transformer in the area, the first load rate range during heavy load, and the second load rate range during overload;

[0012] Calculate the first current load range according to the rated capacity, the turns ratio, the output voltage, and the first load rate range;

[0013] Calculate the second current load range according to the rated capacity, the turns ratio, the output voltage, and the second load rate range.

[0014] In one embodiment, the calculation formula of the first current load range is expressed as:

[0015]

[0016] The calculation formula of the second current load range is expressed as:

[0017]

[0018] In the above formula, avg(I a +I b +I c )1 represents the first current load range, avg(I a +I b +I c )2 represents the second current load range, C a represents the rated capacity, R a represents the turns ratio, V o represents the output voltage, Load_rate1 represents the first load rate range, and Load_rate2 represents the second load rate range.

[0019] In one embodiment, comparing the current load data of the distribution transformer in the area with the first current load range and the second current load range, and determining the preliminary judgment result of heavy overload in the low-voltage power distribution area according to the comparison result includes:

[0020] If the current load data of the distribution transformer in the area falls within the first current load range, it is determined that the preliminary judgment result of heavy overload is that there is heavy load in the low-voltage power distribution area;

[0021] If the current load data of the distribution transformer in the area falls within the second current load range, it is determined that the preliminary judgment result of heavy overload is that there is overload in the low-voltage power distribution area.

[0022] In one embodiment, verifying the preliminary heavy overload judgment result according to the current load data of branches and users includes:

[0023] If the sum of the load data of all branches is equal to the load data of the substation area transformer, and the sum of the load data of all users under each branch is equal to the load data of the corresponding branch, it is determined that the verification of the preliminary heavy overload judgment result passes.

[0024] In one embodiment, locating heavy overload at the branch level according to the magnitudes of the current load data of all branches to determine the heavy overload branches includes:

[0025] Regarding the branches with current load data greater than a preset first load threshold as heavy overload branches; or,

[0026] Regarding the branches with the first preset number of the largest current load data as heavy overload branches.

[0027] In one embodiment, locating heavy overload at the user level according to the magnitudes of the current load data of all users under the heavy overload branches to determine the heavy overload users includes:

[0028] Regarding the users under the heavy overload branches with current load data greater than a preset second load threshold as heavy overload users; or,

[0029] Regarding the branches with the second preset number of the largest current load data as heavy overload branches.

[0030] A heavy overload judgment and location device for a low-voltage substation area, the heavy overload judgment and location device for the low-voltage substation area includes:

[0031] A data acquisition module, configured to acquire the current load data at each monitoring point at different levels of the low-voltage substation area; wherein, the levels of the low-voltage substation area include the substation area transformer, branches, and user levels which are refined in sequence;

[0032] A preliminary judgment module, configured to calculate a first current load interval during heavy load and a second current load interval during overload of the low-voltage substation area, compare the current load data of the substation area transformer with the first current load interval and the second current load interval, and determine the preliminary heavy overload judgment result of the low-voltage substation area according to the comparison result; and verify the preliminary heavy overload judgment result according to the current load data of branches and users;

[0033] A location module, configured to, if the verification result is that there is heavy load or overload in the low-voltage substation area, locate heavy overload at the branch level according to the magnitudes of the current load data of all branches to determine the heavy overload branches, and locate heavy overload at the user level according to the magnitudes of the current load data of all users under the heavy overload branches to determine the heavy overload users.

[0034] A computer-readable storage medium stores a computer program. When the computer program is executed by a processor, the processor is caused to execute the steps of the above-mentioned method for judging and locating heavy overload in a low-voltage power distribution area.

[0035] A device for judging and locating heavy overload in a low-voltage power distribution area includes a memory and a processor. The memory stores a computer program. When the computer program is executed by the processor, the processor is caused to execute the steps of the above-mentioned method for judging and locating heavy overload in a low-voltage power distribution area.

[0036] The present invention provides a method, device, medium and equipment for judging and locating heavy overload in a low-voltage power distribution area. First, current load data at different levels such as substation transformers, branches, and users in the low-voltage power distribution area are obtained. Then, current load intervals during heavy load and overload are calculated and compared with the current load data of the substation transformer to preliminarily judge the heavy overload situation. Further verification is carried out based on the current load data of branches and users. If it is confirmed that there is heavy load or overload, precise positioning is further carried out based on the load data of branches and users to determine the specific heavy overload branches and users, thereby realizing timely and accurate judgment and positioning of heavy overload in the low-voltage power distribution area and effectively improving the stability and operation efficiency of the power system. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for description in the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0038] Among them:

[0039] Figure 1 is a schematic flow chart of the method for judging and locating heavy overload in a low-voltage power distribution area;

[0040] Figure 2 is a schematic flow chart of the judgment and location of heavy overload in a low-voltage power distribution area;

[0041] Figure 3 is a schematic structural diagram of the device for judging and locating heavy overload in a low-voltage power distribution area;

[0042] Figure 4 is a structural block diagram of the device for judging and locating heavy overload in a low-voltage power distribution area. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0043] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts belong to the scope of protection of the present invention.

[0044] The terms "first", "second", etc. in the specification and claims of this application and the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order. In addition, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or units is not limited to the listed steps or units, but optionally further includes steps or units not listed, or optionally further includes other steps or units inherent to these processes, methods, products, or devices.

[0045] Referring to "embodiments" herein means that the specific features, structures, or characteristics described in connection with the embodiments may be included in at least one embodiment of the present application. The phrase appears at various positions in the specification and does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art will explicitly and implicitly understand that the embodiments described herein may be combined with other embodiments.

[0046] As Figure 1 shown, Figure 1 As shown in the figure, it is a schematic flowchart of the method for judging and locating heavy overload in a low-voltage power distribution area in an embodiment. The steps provided by the method for judging and locating heavy overload in the low-voltage power distribution area in this embodiment include:

[0047] S101, obtain the current load data at each monitoring point at different levels in the low-voltage power distribution area.

[0048] Among them, the levels of the low-voltage power distribution area include the substation transformer, branch, and user levels that are refined in sequence. As Figure 2 shown, Figure 2It is a topological relationship diagram of a low-voltage power distribution area. The distribution transformer in the area is a device that converts medium-voltage electricity into low-voltage electricity and supplies power to users in a specific area. Monitoring equipment installed at the distribution transformer in the area collects the output current data of the transformer in real time. These data reflect the electricity energy situation transmitted by the transformer to the entire power distribution area. The branch level refers to multiple branch lines extending from the distribution transformer in the area, and each branch line supplies power to a sub-area or a group of users in the power distribution area. Monitoring equipment is installed at the starting point or key nodes of each branch line to obtain the current load data of the branch line. The user level refers to the final electricity consumers, usually including households, merchants or industrial users. Monitoring equipment is installed at the power supply lines of each user to record the actual current load data of each user.

[0049] Through the data collection at these monitoring points, a comprehensive understanding of the current load situation from the distribution transformer in the area to each branch line and then to each user can be obtained. This provides detailed data support for subsequent judgment and positioning of heavy overloads.

[0050] S102, calculate the first current load interval during heavy load and the second current load interval during overload of the low-voltage power distribution area, compare the current load data of the distribution transformer in the area with the first current load interval and the second current load interval, and determine the preliminary judgment result of heavy overload in the low-voltage power distribution area according to the comparison result.

[0051] Among them, heavy load means that the load is close to the rated capacity of the transformer but has not exceeded it. Overload means that the load exceeds the rated capacity of the transformer. The first current load interval and the second current load interval are the judgment conditions for determining whether there is heavy overload currently.

[0052] In a specific embodiment, the specific steps for calculating the first current load interval during heavy load and the second current load interval during overload of the low-voltage power distribution area include:

[0053] (1), Obtain the rated capacity, turns ratio, output voltage, the first load rate interval during heavy load, and the second load rate interval during overload of the distribution transformer in the area.

[0054] Among them, the obtained rated capacity is expressed as C a , the obtained turns ratio is expressed as R a , the obtained output voltage is expressed as V o , set the first load rate interval as Load_rate1, and 80% < Load_rate1 ≤ 100%, set the second load rate interval as Load_rate2, and Load_rate2 > 100%.

[0055] (2), Calculate the first current load interval according to the rated capacity, turns ratio, output voltage, and the first load rate interval.

[0056] First, the calculation formula for the rated current is as follows:

[0057] I = C / V / 1.732

[0058] e a o

[0059] Secondly, the calculation formula for the load rate range is as follows:

[0060]

[0061] Therefore, the calculation formula for the first current load range is expressed as:

[0062]

[0063] In the above formula, avg(I a +I b +I c )1 represents the first current load range.

[0064] (3) Calculate the second current load range according to the rated capacity, turns ratio, output voltage, and the second load rate range.

[0065] Similarly, the calculation formula for the second current load range is expressed as:

[0066]

[0067] In the above formula, avg(I a +I b +I c )2 represents the second current load range.

[0068] In a specific embodiment, compare the current load data of the distribution transformer in the substation area with the first current load range and the second current load range, and determine the preliminary judgment result of heavy overload in the low-voltage substation area according to the comparison result, including: if the current load data of the distribution transformer in the substation area falls within the first current load range, it is determined that the preliminary judgment result of heavy overload is that there is heavy load in the low-voltage substation area; if the current load data of the distribution transformer in the substation area falls within the second current load range, it is determined that the preliminary judgment result of heavy overload is that there is overload in the low-voltage substation area.

[0069] S103. Verify the preliminary judgment result of heavy overload according to the current load data of the branch and the user.

[0070] In a specific embodiment, verifying the preliminary judgment result of heavy overload according to the current load data of the branch and the user includes: if the sum of the load data of all branches is equal to the load data of the distribution transformer in the substation area, and the sum of the load data of all users under each branch is equal to the load data of the corresponding branch, it is determined that the verification of the preliminary judgment result of heavy overload passes.

[0071] Specifically, we will add up the load data of each branch and compare the result with the load data of the substation area transformer. Then, we will check each branch one by one, add up the load data of all users under each branch, and compare the result with the load data of that branch. If the total load of all branches is equal to the load of the transformer, and the total load of all users under each branch is equal to the load of that branch, it indicates that the data is consistent, and the preliminary judgment result of heavy overload passes the verification.

[0072] Through this verification step, the accuracy and reliability of the preliminary judgment result can be ensured.

[0073] S104. If the verification result shows that there is heavy load or overload in the low-voltage substation area, the heavy overload is located at the branch level according to the magnitude of the current load data of all branches to determine the heavy overload branches, and the heavy overload is located at the user level according to the magnitude of the current load data of all users under the heavy overload branches to determine the heavy overload users.

[0074] Through the method of hierarchical location in this step, the specific branches and users causing heavy load or overload can be accurately found, which is convenient for taking corresponding measures for treatment.

[0075] In a specific embodiment, locating the heavy overload at the branch level according to the magnitude of the current load data of all branches to determine the heavy overload branches includes: taking the branches with current load data greater than a preset first load threshold as heavy overload branches; or, taking the first preset number of branches with larger current load data as heavy overload branches.

[0076] Exemplarily, assume that there are four branches in a certain low-voltage substation area, and their current load data are: Branch A: 180A, Branch B: 250A, Branch C: 210A, Branch D: 150A.

[0077] Method 1: We can set the preset load threshold to 200A. Then the comparison results are: Branch A: 180A (not exceeding the threshold, not a heavy overload branch), Branch B: 250A (exceeding the threshold, a heavy overload branch), Branch C: 210A (exceeding the threshold, a heavy overload branch), Branch D: 150A (not exceeding the threshold, not a heavy overload branch).

[0078] Finally, the heavy overload branches are determined: Branch B and Branch C.

[0079] Method 2: We can set the preset number to 2.

[0080] After sorting, the load data from largest to smallest are: Branch B: 250A, Branch C: 210A, Branch A: 180A, Branch D: 150A. Finally, the first two branches with the largest load data, Branch B and Branch C, are selected as the heavy overload branches.

[0081] It can be understood that in practical applications, we can select a suitable method according to specific situations to determine the heavy overload branches, so as to further take measures for load adjustment and governance.

[0082] In a specific embodiment, heavy overload positioning at the user level is performed according to the magnitudes of the current load data of all users under the heavy overload branches to determine heavy overload users, including: regarding users with current load data greater than a preset second load threshold under the heavy overload branches as heavy overload users; or, regarding the branches with the first second preset number of large current load data as heavy overload branches.

[0083] Exemplarily, assume that there are five users under a certain heavy overload branch, and their current load data are respectively: User A: 40A, User B: 60A, User C: 55A, User D: 30A, User E: 45A.

[0084] Method 1: We can set the preset load threshold to 50A. Then the comparison results are: User A: 40A (not exceeding the threshold, not a heavy overload user), User B: 60A (exceeding the threshold, a heavy overload user), User C: 55A (exceeding the threshold, a heavy overload user), User D: 30A (not exceeding the threshold, not a heavy overload user), User E: 45A (not exceeding the threshold, not a heavy overload user).

[0085] Finally, determine the heavy overload users: User B and User C.

[0086] Method 2: We can set the preset number to 2.

[0087] After sorting, the load data from largest to smallest is: User B: 60A, User C: 55A, User E: 45A, User A: 40A, User D: 30A. Finally, select the first two users with the largest load data: User B and User C as heavy overload users.

[0088] Through these two methods, it is possible to further refine the positioning to specific heavy overload users under the heavy overload branches, thereby achieving precise positioning. This provides data support for subsequent load adjustment, optimization, and governance, ensuring the safe and stable operation of the power grid.

[0089] The above method for judging and locating heavy overload in a low-voltage power distribution area first obtains the current load data of different levels such as substation transformers, branches, and users in the low-voltage power distribution area, then calculates the current load intervals during heavy load and overload, compares them with the current load data of the substation transformer, and preliminarily judges the heavy overload situation. Then, it is verified according to the current load data of the branches and users. If it is confirmed that there is heavy load or overload, further precise positioning is carried out according to the load data of the branches and users to determine the specific heavy-overload branches and users, thus realizing the timely and accurate judgment and location of the heavy-overload situation in the low-voltage power distribution area, and effectively improving the stability and operation efficiency of the power system.

[0090] In one embodiment, as Figure 3 shown, a device for judging and locating heavy overload in a low-voltage power distribution area is proposed. The device includes:

[0091] A data acquisition module 301 for acquiring the current load data at each monitoring point under different levels of the low-voltage power distribution area; wherein, the levels of the low-voltage power distribution area include the substation transformer, branch, and user levels that are refined in sequence;

[0092] A preliminary judgment module 302 for calculating the first current load interval during heavy load and the second current load interval during overload in the low-voltage power distribution area, comparing the current load data of the substation transformer with the first current load interval and the second current load interval, and determining the preliminary judgment result of heavy overload in the low-voltage power distribution area according to the comparison result; and verifying the preliminary judgment result of heavy overload according to the current load data of the branches and users;

[0093] A positioning module 303 for, if the verification result is that there is heavy load or overload in the low-voltage power distribution area, performing heavy-overload positioning at the branch level according to the magnitudes of the current load data of all branches to determine the heavy-overload branches, and performing heavy-overload positioning at the user level according to the magnitudes of the current load data of all users under the heavy-overload branches to determine the heavy-overload users.

[0094] Figure 4 shows the internal structure diagram of a device for judging and locating heavy overload in a low-voltage power distribution area in one embodiment. As Figure 4 shown, the device for judging and locating heavy overload in the low-voltage power distribution area includes a processor, a memory, and a network interface connected through a system bus. Among them, the memory includes a non-volatile storage medium and an internal memory. The non-volatile storage medium of the device for judging and locating heavy overload in the low-voltage power distribution area stores an operating system and can also store a computer program. When the computer program is executed by the processor, the processor can implement the method for judging and locating heavy overload in the low-voltage power distribution area. The internal memory can also store a computer program. When the computer program is executed by the processor, the processor can execute the method for judging and locating heavy overload in the low-voltage power distribution area. Those skilled in the art can understand, Figure 4The structure shown is only a block diagram of some structures related to the solution of this application, and does not constitute a limitation on the heavy overload judgment and positioning device for the low-voltage power distribution area to which the solution of this application is applied. The specific heavy overload judgment and positioning device for the low-voltage power distribution area may include more or fewer components than those shown in the figure, or combine some components, or have different component arrangements.

[0095] A computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the following steps are implemented: obtaining current load data at each monitoring point under different levels of a low-voltage power distribution area; wherein, the levels of the low-voltage power distribution area include the substation transformer, branch, and user levels that are refined in sequence; calculating a first current load interval during heavy overload and a second current load interval during overload of the low-voltage power distribution area, comparing the current load data of the substation transformer with the first current load interval and the second current load interval, and determining a preliminary heavy overload judgment result of the low-voltage power distribution area according to the comparison result; verifying the preliminary heavy overload judgment result according to the current load data of the branch and the user; if the verification result is that there is heavy overload or overload in the low-voltage power distribution area, performing heavy overload positioning at the branch level according to the magnitudes of the current load data of all branches to determine the heavy overload branch, and performing heavy overload positioning at the user level according to the magnitudes of the current load data of all users under the heavy overload branch to determine the heavy overload users.

[0096] A heavy overload judgment and positioning device for a low-voltage power distribution area includes a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, the following steps are implemented: obtaining current load data at each monitoring point under different levels of a low-voltage power distribution area; wherein, the levels of the low-voltage power distribution area include the substation transformer, branch, and user levels that are refined in sequence; calculating a first current load interval during heavy overload and a second current load interval during overload of the low-voltage power distribution area, comparing the current load data of the substation transformer with the first current load interval and the second current load interval, and determining a preliminary heavy overload judgment result of the low-voltage power distribution area according to the comparison result; verifying the preliminary heavy overload judgment result according to the current load data of the branch and the user; if the verification result is that there is heavy overload or overload in the low-voltage power distribution area, performing heavy overload positioning at the branch level according to the magnitudes of the current load data of all branches to determine the heavy overload branch, and performing heavy overload positioning at the user level according to the magnitudes of the current load data of all users under the heavy overload branch to determine the heavy overload users.

[0097] It should be noted that the above-mentioned heavy overload judgment and positioning method, device, equipment, and computer-readable storage medium for the low-voltage power distribution area belong to a general inventive concept, and the content in the embodiments of the heavy overload judgment and positioning method, device, equipment, and computer-readable storage medium for the low-voltage power distribution area can be mutually applicable.

[0098] Those of ordinary skill in the art can understand that all or part of the processes in the methods of the above embodiments can be completed by instructing relevant hardware through a computer program. This program can be stored in a non-volatile computer-readable storage medium. When the program is executed, it can include the processes of the embodiments of the above methods. Among them, any reference to a memory, storage, database, or other medium used in the embodiments provided in the present application can include non-volatile and / or volatile memories. Non-volatile memories can include read-only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM), or flash memory. Volatile memories can include random access memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in many forms, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (DDR SDRAM), enhanced SDRAM (ESDRAM), synchronous link DRAM (SLDRAM), Rambus direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and Rambus dynamic RAM (RDRAM), etc.

[0099] The technical features of the above embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope described in this specification.

[0100] The above embodiments only represent several implementation manners of the present application. The description is relatively specific and detailed, but it should not be construed as a limitation on the patent scope of the present application. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present application, several modifications and improvements can still be made, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application should be subject to the appended claims.

Claims

1. A method for judging and locating heavy overload in a low-voltage power distribution area, characterized in that, The method includes: Obtaining current load data at each monitoring point under different levels of a low-voltage power distribution area; wherein, the levels of the low-voltage power distribution area include, in sequence, the substation transformer, branch, and user levels that are refined step by step; Calculating a first current load range during heavy load and a second current load range during overload of the low-voltage power distribution area, comparing the current load data of the substation transformer with the first current load range and the second current load range, and determining a preliminary judgment result of heavy / overload in the low-voltage power distribution area according to the comparison result; Verifying the preliminary judgment result of heavy / overload according to the current load data of the branches and users; If the verification result indicates that there is heavy load or overload in the low-voltage power distribution area, perform heavy / overload positioning at the branch level according to the magnitudes of the current load data of all branches to determine the heavy / overload branches, and perform heavy / overload positioning at the user level according to the magnitudes of the current load data of all users under the heavy / overload branches to determine the heavy / overload users.

2. The method according to claim 1, wherein The calculating of the first current load range during heavy load and the second current load range during overload of the low-voltage power distribution area includes: Obtaining the rated capacity, turns ratio, output voltage, first load rate range during heavy load, and second load rate range during overload of the substation transformer; Calculating the first current load range according to the rated capacity, turns ratio, output voltage, and the first load rate range; Calculating the second current load range according to the rated capacity, turns ratio, output voltage, and the second load rate range.

3. The method according to claim 2, characterized in that, The calculation formula of the first current load range is expressed as: The calculation formula of the second current load range is expressed as: In the above formula, avg(I a +I b +I c )1 represents the first current load interval, avg(I a +I b +I c )2 represents the second current load interval, C a represents the rated capacity, R a represents the turns ratio, V o represents the output voltage, Load_rate1 represents the first load rate interval, and Load_rate2 represents the second load rate interval.

4. The method according to claim 1, characterized in that, The comparing of the current load data of the substation transformer with the first current load range and the second current load range, and determining a preliminary judgment result of heavy / overload in the low-voltage power distribution area according to the comparison result includes: If the current load data of the substation transformer falls within the first current load range, it is determined that the preliminary judgment result of heavy / overload is that there is heavy load in the low-voltage power distribution area; If the current load data of the substation transformer falls within the second current load range, it is determined that the preliminary judgment result of heavy / overload is that there is overload in the low-voltage power distribution area.

5. The method according to claim 1, wherein The verifying of the preliminary judgment result of heavy / overload according to the current load data of the branches and users includes: If the sum of the load data of all branches is equal to the load data of the substation transformer, and the sum of the load data of all users under each branch is equal to the load data of the corresponding branch, it is determined that the verification of the preliminary judgment result of heavy / overload passes.

6. The method according to claim 1, characterized in that, The performing of heavy / overload positioning at the branch level according to the magnitudes of the current load data of all branches to determine the heavy / overload branches includes: Taking the branches with current load data greater than a preset first load threshold as heavy / overload branches; or, Taking the first preset number of branches with the largest current load data as heavy / overload branches, where the first preset number of branches with the largest current load data are the branches corresponding to the first preset number of current load data in the sorted load data from largest to smallest.

7. The method according to claim 1, wherein The performing of heavy / overload positioning at the user level according to the magnitudes of the current load data of all users under the heavy / overload branches to determine the heavy / overload users includes: Regarding the heavy overload branch, users with current load data greater than a preset second load threshold are regarded as heavy overload users; or, Users with the second largest preset number of current load data are regarded as heavy overload users. The users with the second largest preset number of current load data are the users of the current load data ranked in the top second preset number in the load data sorted from largest to smallest.

8. A heavy overload judgment and positioning device for a low-voltage power distribution area, characterized in that, The heavy overload judgment and positioning device for the low-voltage power distribution area includes: A data acquisition module for acquiring current load data at each monitoring point under different levels of the low-voltage power distribution area; wherein, the levels of the low-voltage power distribution area include the substation transformer, branch, and user levels refined in sequence. A preliminary judgment module for calculating a first current load range during heavy load and a second current load range during overload of the low-voltage power distribution area, comparing the current load data of the substation transformer with the first current load range and the second current load range, and determining a preliminary heavy overload judgment result of the low-voltage power distribution area according to the comparison result; and verifying the preliminary heavy overload judgment result according to the current load data of the branch and the user. A positioning module for, if the verification result is that there is heavy load or overload in the low-voltage power distribution area, performing heavy overload positioning at the branch level according to the magnitudes of the current load data of all branches to determine the heavy overload branch, and performing heavy overload positioning at the user level according to the magnitudes of the current load data of all users under the heavy overload branch to determine the heavy overload users.

9. A computer-readable storage medium, characterized in that, Stores a computer program, which when executed by a processor causes the processor to execute the steps of the method according to any one of claims 1 to 7.

10. A heavy overload judgment and positioning device for a low-voltage power distribution area, characterized in that, Includes a memory and a processor. The memory stores a computer program, which when executed by the processor causes the processor to execute the steps of the method according to any one of claims 1 to 7.

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