Phase adjustment method, system, device and storage medium for three-phase imbalance

Abstract

The present invention discloses a phase adjustment method, system, device and storage medium for three-phase imbalance. The phase adjustment method provided by the present invention considers the branch subordinate loss based on the algorithm optimized inside the meter box, considers the condition of the difference between the branch three-phase power and the three-phase mean, and preferentially adjusts the phase according to the mean close to the mean. If the loss decreases, the next node is performed. If it does not decrease, the minimum user power in the branch is found, the phase is adjusted, and the loss is calculated. If the loss decreases, the phase is adjusted. It can effectively take into account the head end, trunk, branch and terminal of the substation area, and realize the in-depth treatment of the three-phase imbalance in the substation area.

Description

Technical Field

[0001] The present invention belongs to the technical field of power grid imbalance management, and in particular relates to a phase adjustment method, system, device and storage medium for three-phase imbalance. Background Art

[0002] With the annual increase in the amount of electricity consumed by users and enterprises, in areas with high electricity load growth such as rural areas and urban-rural fringe areas, some distribution transformers are affected by geographical location and technical factors, and three-phase imbalance and low voltage are prominent. Furthermore, the three-phase four-wire power supply method is widely used in my country's urban and rural low-voltage distribution networks, and the distribution transformers are mostly 10 / 0.4kV step-down and Y / yn0 wiring. Ideally, the three-phase load is balanced and the transformer operates symmetrically. However, the actual power supply network is a mixture of three-phase production electricity and single-phase load electricity. In addition, the problem of inconsistent standards for related lines, uncontrollable capacity increase of single-phase users, access to high-power loads, and the dispersion of single-phase load electricity consumption time are all factors that cause three-phase load imbalance.

[0003] The traditional three-phase imbalance management in substations often starts from the head end of the substation and pursues the balance at the head end, but it is difficult to effectively take into account the branches and terminals of the substation. From the essence of the three-phase imbalance management in substations, it is easier to achieve a relative balance of the three-phase load at the head end of the substation, but the real difficulty lies in how to find a practical, effective and scientific method to take into account the head end, trunk, branches and terminals of the substation to achieve in-depth management of the three-phase imbalance in the substation. Summary of the invention

[0004] The purpose of the present invention is to provide a phase adjustment method, system, device and storage medium for three-phase imbalance, so as to solve the problem that the traditional three-phase imbalance management in the prior art pursues the balance at the head end, but it is difficult to effectively take into account the branch and end of the substation.

[0005] In order to achieve the above object, the present invention adopts the following technical solution:

[0006] A first aspect of the present invention provides a phase adjustment method for three-phase imbalance, comprising the following steps:

[0007] S1. Obtaining the area topology model;

[0008] S2. Based on the substation topology model, unbalanced phase adjustment is performed on the users in the terminal meter box to obtain the phase adjustment result of the terminal meter box;

[0009] S3. On the basis of the phase adjustment of the terminal meter box, the first branch phase adjustment is performed to make all branches at and under the node initially balanced, and obtain the A, B, and C three-phase users of each branch after the first branch phase adjustment;

[0010] S4, calculating the sum of line losses AΣ at the node and all branches under the node after the first branch phase modulation;

[0011] S5. Calculate the accumulated values ​​of the three-phase electricity of A, B, and C at the node after the first branch phase adjustment respectively, and subtract the average value of the accumulated values ​​of the three-phase electricity of A, B, and C from the accumulated values ​​of the three-phase electricity of A, B, and C respectively, to obtain the difference between the accumulated value of each phase electricity and the average value;

[0012] S6. After the first branch phase adjustment, the A, B, and C three-phase users of each branch are divided into three groups of A, B, and C according to the access phase, and the user with the closest difference is found from the group with the largest accumulated power value;

[0013] S7. On the basis of the first branch phase adjustment, the user with the closest difference is phase adjusted to the group with the smallest accumulated power value, and the accumulated power values ​​of the three groups A, B, and C are updated; the sum of the line losses AΣ' at the node and all branches under the node is calculated. When AΣ' is greater than AΣ, the operation is returned to the last phase adjustment operation, and the second branch phase adjustment is completed to obtain the A, B, and C three-phase users of each branch after the second branch phase adjustment; and the process goes to step S8;

[0014] S8. After the second branch phase adjustment, divide the A, B, and C three-phase users of each branch into three groups of A, B, and C according to the access phase, find the user with the smallest power consumption from the group with the largest accumulated power value, adjust the phase to the group with the smallest accumulated power value, and update the accumulated power values ​​of the three groups A, B, and C. Calculate the sum of the line losses AΣ" at the node and all branches under the node at this time. When AΣ" is greater than AΣ, roll back to the previous phase adjustment operation to complete the third branch phase adjustment.

[0015] Optionally, in step S1, the substation topology model includes: substation name, affiliated line, affiliated substation, name, model, length and wiring type of feeder segment, meter box name and access location, user name, asset number, access phase, user's downline wire diameter, model, length and wiring type, daily active power and reactive power at the head end of the substation, daily average three-phase voltage at the head end, 24-hour average three-phase current at the head end and daily power consumption of the user.

[0016] Optionally, in step S2, the users in the terminal meter box are subjected to unbalanced phase adjustment, and the specific method is as follows:

[0017] The power consumption phase information of users in the terminal meter box is obtained from the substation topology model, and the users are divided into three groups A, B, and C according to the access phase. The users with the largest power consumption in the three groups A, B, and C are used as the benchmark users of their respective groups, and the remaining users are placed in the groups with the smallest power consumption in order from largest to smallest, so as to complete the phase adjustment optimization of the terminal meter box; wherein, each time a user is placed, the group with the smallest power consumption is updated once.

[0018] Optionally, in step S3, the first branch phase adjustment is specifically performed in the following manner:

[0019] The power phase information of users in all branches under the node is obtained from the substation topology model, and the users under each branch are divided into three groups of A, B, and C according to the access phase. The power consumption of the three groups of A, B, and C users under all branches is cross-arranged and combined to obtain multiple phase adjustment schemes. The phase adjustment scheme with the smallest imbalance is used to adjust the phase, and the A, B, and C three-phase users of each branch after the first branch phase adjustment are obtained.

[0020] Optionally, in step S6, the difference is the difference between the power consumption of the user whose most recent power consumption is closest to the group with the largest accumulated power consumption value and the average value.

[0021] Optionally, in step S7, when AΣ' is less than AΣ, the process proceeds to step S5 for iterative calculation based on the updated accumulated values ​​of the three groups of electricity, A, B, and C.

[0022] Optionally, in step S8, when AΣ” is less than AΣ, the process goes to step 5 for iterative calculation based on the currently updated accumulated values ​​of the three groups of power A, B, and C.

[0023] A second aspect of the present invention provides a system for implementing the phase adjustment method for three-phase imbalance, comprising:

[0024] An acquisition module is used to acquire a substation topology model;

[0025] The meter box phase adjustment module is used to perform unbalanced phase adjustment on the users in the terminal meter box based on the substation topology model to obtain the terminal meter box phase adjustment result;

[0026] The first phase adjustment module is used to perform the first branch phase adjustment on the basis of the terminal meter box phase adjustment, so as to make all branches at and under the node initially balanced, and obtain the A, B, and C three-phase users of each branch after the first branch phase adjustment;

[0027] The first calculation module is used to calculate the sum of line losses AΣ at the node and all branches under the node after the first branch phase modulation;

[0028] The second calculation module is used to calculate the accumulated values ​​of the three-phase electric quantity of A, B, and C at the node after the first branch phase adjustment, and to subtract the average value of the accumulated values ​​of the three-phase electric quantity of A, B, and C from the accumulated values ​​of the three-phase electric quantity of A, B, and C, respectively, to obtain the difference between the accumulated value of the electric quantity of each phase and the average value;

[0029] The grouping module is used to divide the A, B, and C three-phase users of each branch into three groups of A, B, and C according to the access phase after the first branch phase adjustment, and find the user with the closest difference from the group with the largest accumulated power value;

[0030] The second phase adjustment module is used to adjust the user with the closest difference to the group with the smallest accumulated power value based on the first branch phase adjustment, and update the accumulated power values ​​of the three groups A, B, and C; calculate the sum of the line losses AΣ' at the node and all branches under the node at this time. When AΣ' is greater than AΣ, fall back to the previous phase adjustment operation, complete the second branch phase adjustment, and obtain the A, B, and C three-phase users of each branch after the second branch phase adjustment;

[0031] The third phase adjustment module is used to divide the A, B, and C three-phase users of each branch after the second branch phase adjustment into three groups of A, B, and C according to the access phase, find the user with the smallest power consumption from the group with the largest cumulative power value, adjust the phase to the group with the smallest cumulative power value, and update the cumulative power values ​​of the three groups A, B, and C. The sum of the line losses AΣ" at the node and all branches under the node is calculated. When AΣ" is greater than AΣ, it falls back to the previous phase adjustment operation to complete the third branch phase adjustment.

[0032] According to a third aspect of the present invention, a computer device is provided, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the phase adjustment method for three-phase imbalance when executing the computer program.

[0033] According to a fourth aspect of the present invention, a computer-readable storage medium is provided, wherein the computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the phase adjustment method for three-phase imbalance is implemented.

[0034] The beneficial effects of the present invention are as follows:

[0035] (A) The phase adjustment method provided by the present invention takes into account the branch subordinate losses based on the internal optimization algorithm of the meter box, and takes into account the difference between the three-phase power of the branch and the three-phase mean. Phase adjustment is performed preferentially according to the mean value close to the average. If the loss decreases, the next node is performed. If it does not decrease, the minimum user power in the branch is found, and the phase adjustment is performed. The loss is calculated and substituted. If the loss decreases, the phase adjustment is performed. It can effectively take into account the head end, trunk, branch and terminal of the substation area, and realize the in-depth treatment of the three-phase imbalance in the substation area.

[0036] (B) The present invention adopts a full-phase calculation method for the substation based on internal optimization of the meter box, which is relatively new in the field and the algorithm is more accurate. It not only overcomes the defect that it is difficult to balance the three-phase loads at the substation branches and terminals, but also improves the accuracy of the algorithm. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0038] Figure 1 It is a flow chart of a phase adjustment method for three-phase imbalance provided by an embodiment of the present invention.

[0039] Figure 2 It is a flow chart of obtaining the substation topology model in an embodiment of the present invention.

[0040] Figure 3 This is a flow chart of unbalanced phase adjustment performed by a user in a terminal meter box in an embodiment of the present invention.

[0041] Figure 4 This is a flow chart of the first branch phase modulation in an embodiment of the present invention. DETAILED DESCRIPTION

[0042] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments. It should be noted that the embodiments and features in the embodiments of the present application can be combined with each other without conflict.

[0043] The following detailed description is an exemplary description, which is intended to provide further detailed description of the present invention. Unless otherwise specified, all technical terms used in the present invention have the same meaning as those generally understood by those skilled in the art to which the present application belongs. The terms used in the present invention are only for describing specific embodiments, and are not intended to limit exemplary embodiments according to the present invention.

[0044] The embodiments of the present invention provide a phase adjustment method, system, device and storage medium for three-phase imbalance. The phase adjustment method is more accurate and efficient, and solves the current problem that it is difficult to achieve balance of three-phase loads at the branch and terminal of the substation.

[0045] like Figure 1 As shown, an embodiment of the present invention provides a phase adjustment method for three-phase imbalance, comprising the following steps:

[0046] S1. Obtain the substation topology model.

[0047] The specific embodiments applied to the present invention are as follows: Figure 2 As shown in the figure, the area topology model includes the following data:

[0048] S11. Call the data of existing source systems such as PMS / GIS / marketing system, for example, the name of the substation, the line to which it belongs, the substation to which it belongs, the name, model, length and wire type of the feeder segment, the name and access location of the meter box, the user name, asset number, access phase, the diameter, model, length and wire type of the user's down-line line; also include the data obtained through the power supply system and the distribution transformer monitoring system, for example, the daily active power and reactive power at the head end of the substation, the daily average phase voltage of the three-phase at the head end, the 24-hour average current of the three-phase at the head end and the daily measured power of the user.

[0049] S12. Based on the data obtained above, the automatic mapping technology is used to generate the substation area topology model, and the mobile terminal application is used to collect the substation area phase information to improve the substation area topology model and basic ledger information.

[0050] S2. Based on the substation topology model, unbalanced phase adjustment is performed on the users in the terminal meter box to obtain the phase adjustment result of the terminal meter box;

[0051] The specific embodiments applied to the present invention are as follows: Figure 3 As shown, the users in the terminal meter box are subjected to unbalanced phase adjustment. The specific method is as follows:

[0052] S21, obtaining the power phase information of users in the terminal meter box from the substation topology model, and dividing the users into three groups of A, B, and C according to the access phase;

[0053] S22, select the user with the largest electricity consumption in the three groups A, B, and C as the benchmark user of each group, and disperse the remaining users;

[0054] S23, arranging them in order from large to small, and placing them in the group with the smallest power consumption in order from large to small, to complete the phase adjustment optimization of the terminal meter box;

[0055] In this embodiment, each time a user is added, the group with the smallest power consumption is updated once.

[0056] S3. On the basis of the phase adjustment of the terminal meter box, the first branch phase adjustment is performed to make the node and all branches under the node preliminarily balanced, and obtain the A, B, and C three-phase users of each branch after the first branch phase adjustment. In this step, there must be at least 2 branches at the node for optimization.

[0057] The specific embodiments applied to the present invention are as follows: Figure 4 As shown, the specific method of the first branch phase modulation is as follows:

[0058] S31, obtaining the power phase information of users in all branches under the node from the substation topology model, and dividing the users under each branch into three groups A, B, and C according to the access phase, namely, A phase group users (Group A), B phase group users (Group B), and C phase group users (Group C);

[0059] S32, exhaustively enumerate the power consumption of the three groups of users A, B, and C under all branches, perform cross-permutation and combination, exhaustively superimpose new three-phase power GroupSumA, GroupSumB, and GroupSumC, and obtain multiple phase adjustment schemes;

[0060] S33. Take the phase adjustment scheme with the smallest unbalance as the adjustment scheme, perform phase adjustment, and obtain the A, B, and C three-phase users of each branch after the first branch phase adjustment.

[0061] As a specific implementation example, in this step, after the users in all branches are grouped according to the access phase, the idea of ​​mathematical permutations and combinations is applied to shuffle the order of all users, and the three-phase users ABC are randomly arranged and combined to obtain multiple schemes, and the scheme with the smallest imbalance is selected as the phase adjustment scheme.

[0062] S4. Calculate the sum of line losses AΣ at the node and all branches under the node after the first branch phase modulation.

[0063] S5. Calculate the accumulated values ​​of the three-phase electricity of A, B, and C at the node after the first branch phase adjustment, GroupA_sumValue, GroupB_sumValue, and GroupC_sumValue respectively; and subtract the average value of the accumulated values ​​of the three-phase electricity of A, B, and C from the accumulated values ​​of the three-phase electricity of A, B, and C respectively, to obtain the difference between the accumulated value of each phase electricity and the average value;

[0064] Average avgValue=(GroupA_sumValue+GroupB_sumValue+GroupC_sumValue) / 3.

[0065] S6. After the first branch phase adjustment, the A, B, and C three-phase users of each branch are divided into three groups according to the access phase, and the user with the closest difference is found from the group with the largest accumulated power value; among them, the power consumption of the user with the closest difference is closest to the difference between the group with the largest accumulated power value and the average value. For example, the accumulated power value of the users in the B phase group is the largest, and the maximum power group minus the average power is obtained as a difference. Find the user closest to this difference from the users in the B group and access phase B to switch to the minimum power group.

[0066] In this step, the number of users in the group with the largest accumulated power value is greater than 1. If there is only one user, he / she will not participate in the adjustment.

[0067] S7. On the basis of the first branch phase adjustment, adjust the user with the closest difference to the group with the smallest accumulated power value, and update the accumulated power values ​​of the three groups A, B, and C; calculate the sum of the line losses AΣ' at the node and all branches under the node at this time. When AΣ' is less than AΣ, based on the updated accumulated power values ​​of the three groups A, B, and C, proceed to step S5 for iterative calculation. When AΣ' is greater than AΣ, return to the previous phase adjustment operation, complete the second branch phase adjustment, and obtain the A, B, and C three-phase users of each branch after the second branch phase adjustment; and proceed to step S8;

[0068] In this step, reverting to the last phase adjustment operation means that when AΣ' is greater than AΣ, the line loss represented by the phase adjustment scheme at this time is greater than the line loss of the first branch phase adjustment, which is not worth the loss. Therefore, it is necessary to revert to the last phase adjustment operation, that is, to restore AΣ' to the phase adjustment scheme represented when it is less than AΣ.

[0069] S8. After the second branch phase adjustment, the A, B, and C three-phase users of each branch are divided into three groups of A, B, and C according to the access phase. The user with the smallest power consumption is found from the group with the largest cumulative power consumption, and the phase is adjusted to the group with the smallest cumulative power consumption. The cumulative power consumption values ​​of the three groups A, B, and C are updated, and the sum of the line losses AΣ" at the node and all branches under the node is calculated. When AΣ" is less than AΣ, the current updated cumulative power consumption values ​​of the three groups A, B, and C are used as the basis, and the iterative calculation is performed in step 5. When AΣ" is greater than AΣ, it returns to the previous phase adjustment operation to complete the third branch phase adjustment.

[0070] In this step, reverting to the last phase adjustment operation means that when AΣ' is greater than AΣ, the line loss represented by the phase adjustment scheme at this time is greater than the line loss of the first branch phase adjustment, which is not worth the loss. Therefore, it is necessary to revert to the last phase adjustment operation, that is, to restore AΣ' to the phase adjustment scheme represented when it is less than AΣ.

[0071] After the above steps, a model of the full-phase calculation method of the substation based on the internal optimization of the meter box is formed, thereby achieving three-phase balance at the substation branches and terminals.

[0072] A second aspect of an embodiment of the present invention provides a system for implementing the above-mentioned phase modulation method, including:

[0073] An acquisition module is used to acquire a substation topology model;

[0074] The meter box phase adjustment module is used to perform unbalanced phase adjustment on the users in the terminal meter box based on the substation topology model to obtain the terminal meter box phase adjustment result;

[0075] The first phase adjustment module is used to perform the first branch phase adjustment on the basis of the terminal meter box phase adjustment, so as to make all branches at and under the node initially balanced, and obtain the A, B, and C three-phase users of each branch after the first branch phase adjustment;

[0076] The first calculation module is used to calculate the sum of line losses AΣ at the node and all branches under the node after the first branch phase modulation;

[0077] The second calculation module is used to calculate the accumulated values ​​of the three-phase electric quantity of A, B, and C at the node after the first branch phase adjustment, and to subtract the average value of the accumulated values ​​of the three-phase electric quantity of A, B, and C from the accumulated values ​​of the three-phase electric quantity of A, B, and C, respectively, to obtain the difference between the accumulated value of the electric quantity of each phase and the average value;

[0078] The grouping module is used to divide the A, B, and C three-phase users of each branch into three groups of A, B, and C according to the access phase after the first branch phase adjustment, and find the user with the closest difference from the group with the largest accumulated power value;

[0079] The second phase adjustment module is used to adjust the user with the closest difference to the group with the smallest accumulated power value based on the first branch phase adjustment, and update the accumulated power values ​​of the three groups A, B, and C; calculate the sum of the line losses AΣ' at the node and all branches under the node at this time. When AΣ' is greater than AΣ, fall back to the previous phase adjustment operation, complete the second branch phase adjustment, and obtain the A, B, and C three-phase users of each branch after the second branch phase adjustment;

[0080] The third phase adjustment module is used to divide the A, B, and C three-phase users of each branch after the second branch phase adjustment into three groups of A, B, and C according to the access phase, find the user with the smallest power consumption from the group with the largest cumulative power value, adjust the phase to the group with the smallest cumulative power value, and update the cumulative power values ​​of the three groups A, B, and C. The sum of the line losses AΣ" at the node and all branches under the node is calculated. When AΣ" is greater than AΣ, it falls back to the previous phase adjustment operation to complete the third branch phase adjustment.

[0081] According to a third aspect of an embodiment of the present invention, a computer device is provided, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements a phase adjustment method for three-phase imbalance when executing the computer program.

[0082] According to a fourth aspect of an embodiment of the present invention, a computer-readable storage medium is provided, wherein the computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, a phase adjustment method for three-phase imbalance is implemented.

[0083] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems, or computer program products. Therefore, the present application may adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment in combination with software and hardware. Moreover, the present application may adopt the form of a computer program product implemented in one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) that include computer-usable program code.

[0084] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0085] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0086] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0087] It is known from common technical knowledge that the present invention can be implemented by other embodiments that do not deviate from its spirit or essential features. Therefore, the above disclosed embodiments are only illustrative in all respects and are not exclusive. All changes within the scope of the present invention or within the scope equivalent to the present invention are included in the present invention.

Claims

1. A phase adjustment method for three-phase imbalance, characterized in that: The steps include: S1. Obtaining the area topology model; S2. Based on the substation topology model, unbalanced phase adjustment is performed on the users in the terminal meter box to obtain the phase adjustment result of the terminal meter box; S3. On the basis of the phase adjustment of the terminal meter box, the first branch phase adjustment is performed to make all branches at and under the node initially balanced, and obtain the A, B, and C three-phase users of each branch after the first branch phase adjustment; S4, calculating the sum of line losses AΣ at the node and all branches under the node after the first branch phase modulation; S5. Calculate the accumulated values ​​of the three-phase electricity of A, B, and C at the node after the first branch phase adjustment respectively, and subtract the average value of the accumulated values ​​of the three-phase electricity of A, B, and C from the accumulated values ​​of the three-phase electricity of A, B, and C respectively, to obtain the difference between the accumulated value of each phase electricity and the average value; S6. After the first branch phase adjustment, the A, B, and C three-phase users of each branch are divided into three groups of A, B, and C according to the access phase, and the user with the closest difference is found from the group with the largest accumulated power value; S7. On the basis of the first branch phase adjustment, the user with the closest difference is adjusted to the group with the smallest accumulated power value, and the accumulated power values ​​of the three groups A, B, and C are updated; Calculate the sum of the line losses AΣ' at the node and all branches under the node at this time. When AΣ' is greater than AΣ, return to the last phase adjustment operation, complete the second branch phase adjustment, and obtain the A, B, and C three-phase users of each branch after the second branch phase adjustment; and proceed to step S8; S8. After the second branch phase adjustment, the A, B, and C three-phase users of each branch are divided into three groups A, B, and C according to the access phase. The user with the smallest power consumption is found from the group with the largest power accumulation value, and the phase is adjusted to the group with the smallest power accumulation value. The power accumulation values ​​of the three groups A, B, and C are updated, and the sum of the line losses at the node and all branches under the node is calculated. When AΣ” When it is greater than AΣ, it returns to the last phase adjustment operation and completes the third branch phase adjustment.

2. The phase adjustment method for three-phase imbalance according to claim 1, characterized in that: In step S1, the substation topology model includes: substation name, affiliated line, affiliated substation, name, model, length and wiring type of feeder segment, meter box name and access location, user name, asset number, access phase, user's downline wire diameter, model, length and wiring type, daily active power and reactive power at the head end of the substation, daily average phase voltage of the three-phase at the head end, 24-hour average current of the three-phase at the head end and daily power consumption of the user.

3. The phase adjustment method for three-phase imbalance according to claim 1, characterized in that: In step S2, the users in the terminal meter box are subjected to unbalanced phase adjustment, and the specific method is as follows: The power consumption phase information of users in the terminal meter box is obtained from the substation topology model, and the users are divided into three groups A, B, and C according to the access phase. The users with the largest power consumption in the three groups A, B, and C are used as the benchmark users of their respective groups, and the remaining users are placed in the groups with the smallest power consumption in order from largest to smallest, so as to complete the phase adjustment optimization of the terminal meter box; wherein, each time a user is placed, the group with the smallest power consumption is updated once.

4. The phase adjustment method for three-phase imbalance according to claim 1, characterized in that: In step S2, the first branch phase adjustment is specifically performed in the following manner: The power phase information of users in all branches under the node is obtained from the substation topology model, and the users under each branch are divided into three groups of A, B, and C according to the access phase. The power consumption of the three groups of A, B, and C users under all branches is cross-arranged and combined to obtain multiple phase adjustment schemes. The phase adjustment scheme with the smallest imbalance is used to adjust the phase, and the A, B, and C three-phase users of each branch after the first branch phase adjustment are obtained.

5. The phase adjustment method for three-phase imbalance according to claim 1, characterized in that: In step S6, the difference is the difference between the group with the largest power consumption and the average value.

6. The phase adjustment method for three-phase imbalance according to claim 1, characterized in that: In step S7, when AΣ' is less than AΣ, the process proceeds to step S5 for iterative calculation based on the updated accumulated values ​​of the three groups of electric power, A, B, and C.

7. The phase adjustment method for three-phase imbalance according to claim 1, characterized in that: In step S8, when AΣ” is less than AΣ, the process goes to step 5 for iterative calculation based on the currently updated accumulated values ​​of the three groups of power A, B, and C.

8. A system for implementing a phase adjustment method for three-phase imbalance, characterized in that: include: An acquisition module is used to acquire a substation topology model; The meter box phase adjustment module is used to perform unbalanced phase adjustment on the users in the terminal meter box based on the substation topology model to obtain the terminal meter box phase adjustment result; The first phase adjustment module is used to perform the first branch phase adjustment on the basis of the terminal meter box phase adjustment, so as to make all branches at and under the node initially balanced, and obtain the A, B, and C three-phase users of each branch after the first branch phase adjustment; The first calculation module is used to calculate the sum of line losses AΣ at the node and all branches under the node after the first branch phase modulation; The second calculation module is used to calculate the accumulated values ​​of the three-phase electric quantity of A, B, and C at the node after the first branch phase adjustment, and to subtract the average value of the accumulated values ​​of the three-phase electric quantity of A, B, and C from the accumulated values ​​of the three-phase electric quantity of A, B, and C, respectively, to obtain the difference between the accumulated value of the electric quantity of each phase and the average value; The grouping module is used to divide the A, B, and C three-phase users of each branch into three groups of A, B, and C according to the access phase after the first branch phase adjustment, and find the user with the closest difference from the group with the largest accumulated power value; The second phase adjustment module is used to adjust the user with the closest difference to the group with the smallest accumulated power value on the basis of the first branch phase adjustment, and update the accumulated power values ​​of the three groups A, B and C; Calculate the sum of the line losses AΣ' at the node and all branches under the node at this time. When AΣ' is greater than AΣ, return to the last phase adjustment operation, complete the second branch phase adjustment, and obtain the A, B, and C three-phase users of each branch after the second branch phase adjustment. The third phase adjustment module is used to divide the A, B, and C three-phase users of each branch after the second branch phase adjustment into three groups of A, B, and C according to the access phase, find the user with the smallest power consumption from the group with the largest cumulative power value, adjust the phase to the group with the smallest cumulative power value, and update the cumulative power values ​​of the three groups A, B, and C. The sum of the line losses AΣ" at the node and all branches under the node is calculated. When AΣ" is greater than AΣ, it falls back to the previous phase adjustment operation to complete the third branch phase adjustment.

9. A computer device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the computer program, the phase adjustment method for three-phase imbalance according to any one of claims 1 to 7 is implemented.

10. A computer-readable storage medium storing a computer program, characterized in that: When the computer program is executed by a processor, the phase adjustment method for three-phase imbalance according to any one of claims 1 to 7 is implemented.

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