Three-phase balance user phase adjustment method based on multi-objective optimization control

Abstract

The invention provides a three-phase balance user phase adjustment method based on multi-objective optimization control, and relates to the technical field of power system control. According to the technical scheme provided by the invention, after the phase distribution results under different constraint conditions are calculated, the problem of deterioration of other indexes possibly caused by single target optimization can be avoided by constructing the multi-objective function containing the indexes. And meanwhile, multi-objective function value calculation and comparison are carried out on each phase distribution scheme, and the phase distribution scheme with the minimum multi-objective function value is selected as the optimal scheme, so that the overall optimality and the balance of each technical index can be considered. Compared with a phase adjustment mode in which only a single-phase meter or a three-phase meter is considered in the prior art, the phase adjustment scheme provided by the invention adopts a multi-objective function to realize trade-off optimization among indexes for the condition that the single-phase meter and the three-phase meter exist at the same time, so that accurate phase adjustment can be realized, and the load balancing effect is improved.

Description

Technical Field

[0001] This application relates to the technical field of power system control, and particularly to a three-phase balanced user phase adjustment method based on multi-objective optimization control. Background Art

[0002] With the continuous growth of electricity demand, the problem of unbalanced three-phase loads in low-voltage distribution networks has become increasingly prominent. The power load balancing system of a low-voltage distribution network is a system that reasonably distributes the loads of each phase to make the three-phase current or power as balanced as possible. Due to the increasing number of residential electrical equipment and diverse load types, the three-phase load is unbalanced, resulting in problems such as excessive neutral line current, increased system losses, and degraded power quality. Therefore, it is necessary to achieve power load balance to improve power supply quality and economy.

[0003] Currently, the commonly used power load balancing method is to redistribute the loads connected to the low-voltage distribution network to each phase through a switching device without interruption of power supply to achieve dynamic balance of the three-phase load. However, this method only takes achieving an imbalance degree of current or power less than a certain threshold as a single objective, and the target object is limited to single-phase meter metering. However, in actual operation, this method is affected by the time-varying characteristics of the load and the electricity consumption pattern of users, resulting in inaccurate phase adjustment results and poor load balancing effects. Summary of the Invention

[0004] This application provides a three-phase balanced user phase adjustment method, system, storage medium, and electronic device based on multi-objective optimization control, which can achieve accurate phase adjustment and improve the load balancing effect.

[0005] In a first aspect, this application provides a three-phase balanced user phase adjustment method based on multi-objective optimization control. The method includes: Obtain the load data of the distribution network terminal and the low-voltage side users, and identify the initial phase topological relationship according to the load data; According to the load data and the initial phase topological relationship, calculate the phase allocation results corresponding to different constraint conditions respectively. The constraint conditions are minimum line loss power, minimum load imbalance degree, minimum current imbalance degree, minimum voltage imbalance degree, and minimum meter count imbalance degree; Construct a multi-objective function of line loss power, load imbalance degree, current imbalance degree, voltage imbalance degree, and meter count imbalance degree; Calculate the multi-objective function values corresponding to each phase allocation result according to the multi-objective function, and determine the phase allocation result corresponding to the minimum multi-objective function value as the optimal phase allocation result; Generate a phase adjustment plan for the distribution network terminal and the low-voltage side users according to the optimal phase allocation result.

[0006] By adopting the above technical solution, after calculating the phase allocation results under different constraints, by constructing a multi-objective function that includes the above-mentioned indicators, the problem of deterioration of other indicators that may be caused by single-objective optimization can be avoided. At the same time, the multi-objective function values of each phase allocation scheme are calculated and compared, and the phase allocation scheme with the smallest multi-objective function value is selected as the optimal scheme, which can take into account both overall optimality and the balance of various technical indicators. Compared with the phase adjustment method that only considers single-phase meters or three-phase meters in related technologies, the phase adjustment scheme provided by this application adopts a multi-objective function to achieve a trade-off optimization between various indicators for the case where single-phase meters and three-phase meters exist at the same time, thereby achieving accurate phase adjustment and improving the load balancing effect.

[0007] Optionally, calculating phase allocation results corresponding to different constraint conditions according to the load data and the initial phase topology relationship includes: The initial phase topology relationship is updated based on the connection mode of the target user meter until the highest phase of the distribution network terminal can no longer be allocated; Recording the phase topology relationship after each phase update, and calculating the index data corresponding to the phase topology relationship based on the load data; The phase topology relationship corresponding to the optimal solution of the indicator data is determined as the phase allocation result corresponding to the current constraint condition.

[0008] By adopting the above technical solution, the initial phase topology relationship is updated based on the wiring method of the target user meter, realizing the dynamic adjustment process of the phase allocation until the highest phase at the distribution network terminal can no longer be allocated. After each phase update, the effect of each adjustment can be tracked and evaluated by recording the phase topology relationship and calculating the corresponding index data in combination with the load data. By determining the phase topology relationship corresponding to the optimal solution of the index data as the phase allocation result under the current constraint conditions, it is ensured that the best phase configuration scheme is obtained under specific constraint conditions. This phase allocation method based on iterative optimization can find the optimal phase allocation scheme within the constraint conditions by continuously tracking and evaluating the adjustment effect, thereby improving the accuracy and efficiency of phase adjustment.

[0009] Optionally, recording the phase topology relationship after each phase update and calculating index data corresponding to the phase topology relationship according to the load data includes: When the constraint condition is that the line loss is minimized, the unbalanced line loss corresponding to the phase topology relationship under the three-phase load unbalance state is calculated according to the load data; Use the ratio calculation formula to calculate the loss ratio between the three-phase load unbalanced state and the three-phase load balanced state; Calculate the line loss power corresponding to the phase topology relationship according to the unbalanced line loss power and the loss ratio, where the line loss power is the index data corresponding to the constraint condition with the minimum line loss power.

[0010] By adopting the above technical solution, when the constraint condition is the minimum line loss power, first calculate the unbalanced line loss power corresponding to the phase topology relationship under the three-phase load unbalanced state according to the load data, then obtain the loss ratio between the three-phase load unbalanced state and the three-phase load balanced state through the ratio calculation formula, and finally calculate the line loss power corresponding to the phase topology relationship based on the unbalanced line loss power and the loss ratio as the index data corresponding to the constraint condition. This calculation method not only considers the actual line loss situation under the load unbalanced state, but also introduces the loss ratio with the ideal balanced state as an evaluation parameter. Through the comprehensive calculation of two dimensions, it can more accurately reflect the influence of the phase topology relationship on the line loss.

[0011] Optionally, calculating the loss ratio between the three-phase load unbalanced state and the three-phase load balanced state using the ratio calculation formula includes: Determine the phase state of the three-phase load current according to the ratio of each phase current in the three-phase load current to the average value of the three-phase load current, where the phase state includes one phase heavy, one phase light, one phase average or one phase heavy, two phases light or two phases heavy, one phase light; Input the three-phase load current and the phase state into the ratio calculation formula to obtain the loss ratio between the three-phase load unbalanced state and the three-phase load balanced state; Wherein, the ratio calculation formula is: , ; Wherein, represents the loss ratio between the three-phase load unbalanced state and the three-phase load balanced state, represents the three-phase load current unbalance degree, represents the maximum phase load current in the three-phase load current, represents the average value of the three-phase load current.

[0012] By adopting the above technical solution, by comparing the ratios of the currents of each phase in the three-phase load current to the average value of the three-phase load current, the accurate judgment of the phase state of the three-phase load current is realized, including various states such as one phase being heavy, one phase being light, one phase being average, or one phase being heavy, two phases being light, or two phases being heavy, one phase being light, etc. On this basis, substituting the three-phase load current and the phase state into the ratio calculation formula, a quantitative relationship between the three-phase load unbalance state and the loss ratio of the three-phase load balance state is established. The ratio calculation formula introduces the unbalance degree of the three-phase load current and the relationship between the maximum load current of one phase and the average value, which can accurately reflect the influence degree of load unbalance on line loss.

[0013] Optionally, the phase update of the initial phase topology relationship based on the wiring mode of the target user meter until the highest phase of the distribution network terminal cannot be further allocated includes: Judging the wiring mode of the target user meter; If the wiring mode of the target user meter is the single-phase meter wiring mode, update the high phase of the target user meter to the low phase, and update the phase parameter values of each phase in the distribution network terminal until the highest phase of the distribution network terminal cannot be further allocated; If the wiring mode of the target user meter is the three-phase four-wire meter wiring mode, obtain the high-parameter phase and the low-parameter phase of the target user meter; if the low-parameter phase of the target user meter is not equal to the high phase of the distribution network terminal, mark the low-parameter phase of the target user meter as the high phase of the distribution network terminal, and update the phase parameter values of the high phase and the low-parameter phase; if the high-parameter phase of the target user meter is not equal to the low phase of the distribution network terminal, mark the high-parameter phase of the target user meter as the low phase of the distribution network terminal, and update the phase parameter values of the low phase and the high-parameter phase until the highest phase of the distribution network terminal cannot be further allocated.

[0014] By adopting the above technical solution, for the single-phase meter wiring mode, by updating the high phase of the target user meter to the low phase and synchronously updating the phase parameter values of each phase of the distribution network terminal, the dynamic adjustment of the phase is realized. For the three-phase four-wire meter wiring mode, the scheme realizes the phase optimization in a more complex scenario by obtaining the high-parameter phase and the low-parameter phase of the target user meter and making corresponding markings and parameter value updates according to their relationships with the high phase and the low phase of the distribution network terminal. This phase update method based on the characteristics of the wiring mode not only considers the actual wiring situation of the user meter, but also ensures the feasibility and rationality of the phase adjustment scheme by continuously adjusting the phase parameters until the highest phase of the distribution network terminal cannot be further allocated.

[0015] Optionally, determine the user meter connected to the high phase of the distribution network terminal according to the initial phase topology relationship; Calculate the phase parameter difference between the high phase parameter value and the average phase parameter value in the distribution network terminal, and determine the user meter closest to the phase parameter difference as the target user meter.

[0016] By adopting the above technical solution, determine the user meter connected to the high phase of the distribution network terminal according to the initial phase topology relationship, and then select the user meter closest to the difference as the target user meter by calculating the difference between the high phase parameter value and the average phase parameter value in the distribution network terminal. This method of selecting the target user meter based on the parameter difference can give priority to identifying the user meter most representative of the impact on phase imbalance, improving the accuracy of the subsequent phase allocation result.

[0017] Optionally, calculating the index data corresponding to the phase topology relationship according to the load data includes: When the constraint condition is the minimum load imbalance degree, take the three-phase load imbalance degree as the index data; Input the load data into the load balance degree quantization index calculation formula to obtain the three-phase load imbalance degree corresponding to the phase topology relationship; The load balance degree quantization index calculation formula is: ; Wherein, represents the three-phase load imbalance degree, represents the active power of phase A at time k, represents the active power of phase B at time k; represents the active power of phase C at time k; represents the average value of the three-phase active power at time k, and k represents the corresponding time at each phase update.

[0018] By adopting the above technical solution, using the evaluation method based on the load balance degree quantization index not only considers the deviation between the active power of each phase and the average value, but also realizes the dynamic monitoring of the phase update process by introducing the time k parameter after phase update, so as to accurately reflect the three-phase load distribution situation after each phase adjustment.

[0019] Optionally, calculating the index data corresponding to the phase topology relationship according to the load data includes: When the constraint condition is the minimum current imbalance degree, take the three-phase current imbalance degree as the index data; Input the load data into the current balance degree quantization index calculation formula to obtain the three-phase current imbalance degree corresponding to the phase topology relationship; The calculation formula for the quantization index of current balance degree is as follows: ; Wherein, represents the three-phase current unbalance degree, represents the current of phase A at time k; represents the current of phase B at time k; represents the current of phase C at time k; represents the average value of the three-phase current at time k, and k represents the corresponding time at each phase update.

[0020] By adopting the above technical solution, not only the deviation between each phase current and the average value is considered, but also the dynamic tracking of the phase update process is realized by introducing the time k after phase update, so as to accurately reflect the three-phase current balance condition after each phase adjustment, and provide a reliable quantization basis for selecting the optimal phase allocation scheme.

[0021] Optionally, calculating the index data corresponding to the phase topology relationship according to the load data includes: When the constraint condition is the minimum voltage unbalance degree, the three-phase voltage unbalance is used as the index data; Input the load data into the calculation formula for the quantization index of voltage balance degree to obtain the three-phase voltage unbalance degree corresponding to the phase topology relationship; The calculation formula for the quantization index of voltage balance degree is as follows: ; Wherein, represents the three-phase voltage unbalance degree, represents the voltage of phase A at time k; represents the voltage of phase B at time k; represents the voltage of phase C at time k; represents the average value of the three-phase voltage at time k, and k represents the corresponding time at each phase update.

[0022] By adopting the above technical solution, an evaluation method based on the quantization index of voltage balance degree is adopted. Not only the deviation between each phase voltage and the average value is considered, but also the dynamic tracking of the phase update process is realized by introducing the time k parameter, so as to accurately reflect the three-phase voltage balance condition after each phase adjustment, and provide a reliable quantization basis for selecting the optimal phase allocation scheme.

[0023] Optionally, calculating the index data corresponding to the phase topology relationship according to the load data includes: When the constraint condition is the minimum meter count unbalance degree, the meter count unbalance degree is used as the index data; Input the load data into the calculation formula of the user number balance degree quantization index to obtain the meter count imbalance degree corresponding to the phase topology relationship; The calculation formula of the user number balance degree quantization index is: ; where, represents the meter count imbalance degree; represents the meter count connected to the A phase of the distribution network terminal; represents the meter count connected to the B phase of the distribution network terminal; represents the meter count connected to the C phase of the distribution network terminal; represents the average value of the meter counts connected to the three phases of the distribution network terminal, and k represents the corresponding moment at each phase update.

[0024] By adopting the above technical solution, taking the meter count imbalance degree as the index data and inputting the load data into the calculation formula of the user number balance degree quantization index, which calculates the ratio of the maximum value of the difference in meter counts on the A, B, and C phases of the distribution network terminal to the average value of the meter counts on the three phases, realizes the precise quantization of the imbalance degree of the meter count distribution.

[0025] In a second aspect, the present application provides a three-phase balanced user phase adjustment system based on multi-objective optimization control. The system includes: A data processing module, configured to obtain the load data of the distribution network terminal and the low-voltage side users, and identify the initial phase topology relationship according to the load data; A first calculation module, configured to calculate the phase allocation results corresponding to different constraint conditions according to the load data and the initial phase topology relationship. The constraint conditions are the minimum line loss power, the minimum load imbalance degree, the minimum current imbalance degree, the minimum voltage imbalance degree, and the minimum meter count imbalance degree; A function construction module, configured to construct a multi-objective function of the line loss power, the load imbalance degree, the current imbalance degree, the voltage imbalance degree, and the meter count imbalance degree; A second calculation module, configured to calculate the multi-objective function values corresponding to each of the phase allocation results according to the multi-objective function, and determine the phase allocation result corresponding to the minimum multi-objective function value as the optimal phase allocation result; A scheme generation module, configured to generate a phase adjustment scheme for the distribution network terminal and the low-voltage side users according to the optimal phase allocation result.

[0026] In a third aspect, the present application provides a computer storage medium, which stores multiple instructions, and the instructions are adapted to be loaded and executed by a processor to perform any one of the above methods.

[0027] In a fourth aspect, the present application provides an electronic device comprising a processor, a memory and a transceiver, wherein the memory is used to store instructions, the transceiver is used to communicate with other devices, and the processor is used to execute the instructions stored in the memory so that the electronic device performs any one of the above methods.

[0028] In summary, the beneficial effects brought about by the technical solution of this application include: By adopting the above technical solution, after calculating the phase allocation results under different constraints, by constructing a multi-objective function that includes the above-mentioned indicators, the problem of deterioration of other indicators that may be caused by single-objective optimization can be avoided. At the same time, the multi-objective function values of each phase allocation scheme are calculated and compared, and the phase allocation scheme with the smallest multi-objective function value is selected as the optimal scheme, which can take into account both overall optimality and the balance of various technical indicators. Compared with the phase adjustment method that only considers single-phase meters or three-phase meters in related technologies, the phase adjustment scheme provided by this application adopts a multi-objective function to achieve a trade-off optimization between various indicators for the case where single-phase meters and three-phase meters exist at the same time, thereby achieving accurate phase adjustment and improving the load balancing effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is a flow chart of a three-phase balanced user phase adjustment method based on multi-objective optimization control according to an embodiment of the present application; Figure 2 This is a structural diagram of a three-phase balanced user phase adjustment system based on multi-objective optimization control according to an embodiment of the present application; Figure 3 This is a structural diagram of an electronic device provided in an embodiment of the present application.

[0030] Description of reference numerals: 300, electronic device; 301, processor; 302, communication bus; 303, user interface; 304, network interface; 305, memory. DETAILED DESCRIPTION

[0031] In order to enable people skilled in the art to better understand the technical solutions in this specification, the technical solutions in the embodiments of this specification will be clearly and completely described below in conjunction with the drawings in the embodiments of this specification. Obviously, the described embodiments are only part of the embodiments of this application, not all of the embodiments.

[0032] In the description of the embodiments of the present application, words such as "exemplary", "for example" or "for illustration" are used to represent examples, illustrations or explanations. Any embodiment or design solution described as "exemplary", "for example" or "for illustration" in the embodiments of the present application should not be construed as being more preferred or having more advantages than other embodiments or design solutions. Rather, the use of words such as "exemplary", "for example" or "for illustration" is intended to present related concepts in a specific manner.

[0033] In the description of the embodiments of the present application, the term "plurality" means two or more. For example, a plurality of systems means two or more systems, and a plurality of screen terminals means two or more screen terminals. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. The terms "include", "comprise", "have" and their variants all mean "including but not limited to", unless otherwise specifically emphasized in other ways.

[0034] Please refer to Figure 1 , which is a schematic flowchart of a three-phase balanced user phase adjustment method based on multi-objective optimization control provided by the embodiments of the present application. This method can be implemented depending on a computer program, can be implemented depending on a single-chip microcomputer, or can run on a three-phase balanced user phase adjustment system based on the von Neumann architecture and based on multi-objective optimization control. This computer program can be integrated in an application or can run as an independent tool-type application. The following will make a detailed description of the specific steps of the three-phase balanced user phase adjustment method based on multi-objective optimization control.

[0035] S101: Obtain the load data of the distribution network terminal and the low-voltage side users, and identify the initial phase topology relationship according to the load data.

[0036] Among them, the load data can be understood as the real-time power parameter measurement data of the user side and the terminal in the distribution network, including basic information such as time stamps, three-phase current values, three-phase voltage values, three-phase active power, power factor, and related asset numbers and user identifiers. These load data are the basic data sources for realizing three-phase balance adjustment. By collecting and analyzing these data, the initial phase topology relationship of the distribution network can be identified, and key indicators such as load imbalance degree, current imbalance degree, and voltage imbalance degree can be calculated, so as to evaluate the balance state of the three-phase load of the current distribution network and provide a basis for formulating a phase adjustment plan.

[0037] Among them, the initial phase topological relationship refers to the original connection relationship between all user meters in the distribution network and the distribution network terminals (phases A, B, and C). In the embodiments of the present application, it can be understood as the connection status information of the phases of the user meters and the terminal meters obtained according to the load data preprocessing and phase identification process. This information reflects how each user meter in the current distribution network is connected to which phase (single-phase or three-phase four-wire). This initial phase topological relationship is used to characterize the initial state of the load distribution in the distribution network.

[0038] Specifically, the load data is collected in real time through the data acquisition unit of the distribution network terminal. The load data includes basic information such as time stamps, three-phase current values, three-phase voltage values, three-phase active power, power factor, and related asset numbers and user identifiers. These load data reflect the electricity consumption characteristics and load distribution status of each user in the distribution network. In the specific identification process, first, the wiring method information is extracted according to the asset number of the user meter to determine whether each user meter uses a single-phase wiring method or a three-phase four-wire wiring method; then, by analyzing the phase information in the load data, the connection status of each user meter and each phase of the distribution network terminal is determined, and finally, a complete initial phase topological relationship is formed.

[0039] Optionally, before identifying the initial phase topological relationship, the load data is preprocessed.

[0040] Due to possible data anomalies caused by equipment failures, data transmission failures, human operation errors, etc. during the power data collection process, it is necessary to preprocess the collected original data, including unifying the data format, removing redundant data, identifying abnormal data, filling in missing values, etc. After data preprocessing, the user load data and terminal load data are merged and sorted in chronological order, and the phase topological relationship between the user meter and the terminal meter is identified by analyzing features such as current fluctuation consistency, current correlation, voltage correlation, and large current. Since the current data in the distribution network system is on the secondary side, it is necessary to uniformly convert the current data of the user and the terminal to the primary side before identification. In this way, the asset number, wiring method (single-phase or three-phase four-wire), and specific connection relationship with the three-phase power supply of each user meter in the distribution network can be obtained, forming a complete initial phase topological relationship.

[0041] S102: According to the load data and the initial phase topological relationship, calculate the phase allocation results corresponding to different constraint conditions respectively. The constraint conditions are the minimum line loss power, the minimum load unbalance degree, the minimum current unbalance degree, the minimum voltage unbalance degree, and the minimum meter count unbalance degree.

[0042] Among them, the line loss power refers to the power loss caused by factors such as wire resistance and equipment impedance during the power transmission process in the distribution network. Specifically, in the embodiments of the present application, it can be understood as the additional line loss caused by the unbalance of three-phase loads, mainly including the difference between the unbalanced line loss power under the state of three-phase load imbalance and the reference line loss power under the state of three-phase load balance.

[0043] Among them, the load imbalance degree refers to the degree of uneven distribution of the three-phase load power in the distribution network, reflecting the deviation state of the load power among the three phases. In the embodiments of the present application, it can be understood as the degree of deviation between the active power of each phase and the average active power of the three phases, and is quantitatively evaluated through the calculation formula of the load balance degree quantization index. Its calculation result characterizes the balance of the load power distribution on phases A, B, and C. By calculating and monitoring the load imbalance degree, the power load distribution of each phase in the distribution network can be intuitively reflected.

[0044] Among them, the current imbalance degree refers to the degree of uneven distribution of the magnitudes of the three-phase currents in the distribution network, reflecting the deviation state between the current of each phase and the average current of the three phases. In the embodiments of the present application, it can be understood as the degree of deviation between the current values of phases A, B, and C and the average value of the three-phase currents, and is quantitatively evaluated through the calculation formula of the current balance degree quantization index. Its calculation result can accurately characterize the balance of the three-phase current distribution in the distribution network.

[0045] Among them, the voltage imbalance degree refers to the degree of uneven distribution of the magnitudes of the three-phase voltages in the distribution network, reflecting the deviation state between the voltage of each phase and the average voltage of the three phases. In the embodiments of the present application, it can be understood as the degree of deviation between the voltage values of phases A, B, and C and the average value of the three-phase voltages, and is quantitatively evaluated through the calculation formula of the voltage balance degree quantization index. Its calculation result can characterize the balance of the three-phase voltage distribution in the distribution network.

[0046] Among them, the meter count imbalance degree refers to the degree of uneven distribution of the number of user meters connected to the three phases of the distribution network, reflecting the distribution difference state of the number of users on each phase. In the embodiments of the present application, it can be understood as the degree of deviation between the number of meters connected to phases A, B, and C at the terminal of the distribution network and the average value of the number of meters of the three phases, and is quantitatively evaluated through the calculation formula of the user number balance degree quantization index. Its calculation result can characterize the balance of the distribution of user meters on the three phases.

[0047] Among them, the phase allocation results corresponding to different constraint conditions refer to the optimal phase connection schemes calculated respectively under the five constraint conditions of the minimum line loss power, the minimum load unbalance degree, the minimum current unbalance degree, the minimum voltage unbalance degree, and the minimum meter count unbalance degree. In the embodiments of the present application, it can be understood that by performing phase update iterations on the initial phase topology relationship, the phase topology relationships that can optimize the corresponding indicators are obtained respectively under each constraint condition. These phase topology relationships record the optimal connection states between the user meters and each phase of the distribution network terminal. By calculating the phase allocation results corresponding to different constraint conditions, optimal solutions can be obtained respectively from multiple dimensions such as line loss optimization, load balancing, current balancing, voltage balancing, and user number balancing. Since there may be conflicts between these constraint conditions, such as the phase allocation scheme for reducing line loss may lead to an increase in the meter count unbalance degree, it is necessary to balance the impacts of each constraint condition through multi-objective optimization, and finally select a phase adjustment scheme with the optimal comprehensive performance.

[0048] During specific implementation, first, based on the initial phase topology relationship, the phase parameters in the distribution network terminal are updated iteratively. For the phase topology relationship obtained in each iteration, the index values under the five constraint conditions are calculated respectively using the load data: the line loss index is obtained by calculating the unbalanced line loss power under the three-phase load unbalanced state, the load unbalance degree index is obtained by using the calculation formula of the load balance degree quantization index, the current unbalance degree index is obtained by using the calculation formula of the current balance degree quantization index, the voltage unbalance degree index is obtained by applying the calculation formula of the voltage balance degree quantization index, and the meter count unbalance degree index is obtained by using the calculation formula of the user number balance degree quantization index. During the iteration process, the phase topology relationships that can make the corresponding indicators reach the optimal values under each constraint condition are recorded. When the highest phase of the distribution network terminal cannot be allocated continuously, the iteration process ends.

[0049] In this way, five groups of different phase allocation results can be obtained, and each group of results is the optimal solution under specific constraint conditions. These results reflect the optimization effects of phase adjustment from different perspectives such as energy efficiency, load distribution, current characteristics, voltage quality, and user distribution.

[0050] Based on the above embodiments, as an optional implementation manner, step S102 specifically further includes S201 - S203.

[0051] S201: Update the phase of the initial phase topology relationship based on the wiring method of the target user meter until the highest phase of the distribution network terminal cannot be allocated continuously; In specific implementation, during the phase update process, the wiring mode of the target user meter is first identified. For the user meter with a single-phase meter wiring mode, since it has a single high-phase access point, its high phase is directly updated to the low phase during the update, and the phase parameter value of the corresponding phase in the distribution network terminal is synchronously updated. For the user meter with a three-phase four-wire meter wiring mode, since there are multiple phase access points, it is necessary to first obtain its high-parameter phase and low-parameter phase, and then update the phase parameter value through comparison and marking operations. After each phase update is completed, the current phase topology relationship needs to be recorded for subsequent calculation of various performance indicators. This update process needs to be continuously carried out until the highest phase of the distribution network terminal cannot be further allocated to other user meters.

[0052] Based on the above embodiments, as an alternative implementation manner, in view of the different wiring modes of the target user meters, step S201 specifically further includes S301 - S303.

[0053] S301: Determine the wiring mode of the target user meter; Among them, the target user meter refers to the user electric energy meter that is representative under the current constraint conditions, and can be understood as the user meter that can most significantly reflect the characteristics of specific constraint conditions in the embodiments of the present application, and is used to guide the direction of phase optimization adjustment.

[0054] In specific implementation, the wiring mode of the target user meter is identified and judged by reading the user meter wiring data in the distribution network terminal. The specific judgment can be completed based on the wiring parameter information stored in the distribution network terminal through the analysis of the number of phase access points and connection characteristics. There are various wiring mode identification methods in the related technical solutions, and any one of them can be used as an implementable way to judge the wiring mode of the target user meter in the present application, and will not be elaborated here.

[0055] Based on the above embodiments, as an alternative implementation manner, the determination of the target user meter can be achieved in the following way.

[0056] According to the initial phase topology relationship, determine the user meters connected to the high phase of the distribution network terminal; calculate the phase parameter difference between the high-phase parameter value and the average phase parameter value in the distribution network terminal, and determine the user meter closest to the phase parameter difference as the target user meter.

[0057] During specific implementation, all user meters connected to the high phase of the distribution network terminal are determined based on the initial phase topological relationship. By calculating the difference between the high-phase parameter value and the average value of the phase parameters in the distribution network terminal, and using this difference as the target value, the meter with the parameter value closest to this target value is found among the user meters on the high phase as the target user meter. This selection method ensures that the parameter characteristics of the selected target user meter match the overall imbalance degree of the system.

[0058] Specifically, for example, when the constraint condition is the minimum line loss power or the minimum current imbalance degree, since the line loss is related to the current imbalance degree, the parameter value is the current value at this time. The specific implementation steps are as follows: after determining all user meters connected to the high phase of the distribution network terminal, find the high-phase current and the low-phase current from the A, B, and C phase currents of the distribution network terminal, calculate the difference between the high-phase current and the average value of the three-phase currents, and then find the target user meter closest to this difference from all user meters connected to the high phase. Similarly, when the constraint condition is the minimum load imbalance degree, the parameter value is the active power. When the constraint condition is the minimum voltage imbalance degree, the parameter value is the voltage value.

[0059] Specifically, for the case where the constraint condition is the minimum meter count imbalance degree, find the high-phase meter count, the medium-phase meter count, and the low-phase meter count according to the number of user meters connected to each phase of A, B, and C of the distribution network terminal, and then calculate the differences between the meter counts on each phase of the high-phase meter count, the medium-phase meter count, and the low-phase meter count and the average value of the meter counts respectively. Since the meter count imbalance degree is judged by the overall quantity, there is no need to screen out the target user meter.

[0060] Correspondingly, the phase update of the user meter count is specifically carried out in the following way: When the difference between the high-phase meter count and the average value of the meter counts is greater than 0, the difference between the medium-phase meter count and the average value of the meter counts is greater than or equal to 0, and the difference between the low-phase meter count and the average value of the meter counts is less than 0, all single-phase meters are screened out from the high-phase meter count and the medium-phase meter count, then calculate the sum of the difference between the high-phase meter count and the average value of the meter counts plus the difference between the medium-phase meter count and the average value of the meter counts and round down, and finally screen out the above number of meters from the selected single-phase meters and move them to the low-phase meter count.

[0061] When the difference between the high-phase meter count and the average value of the meter counts is greater than 0, and the differences between the medium-phase meter count and the average value of the meter counts and the low-phase meter count and the average value of the meter counts are both less than 0, all single-phase meters are screened out from the high-phase meter count, then move the meters with the difference between the medium-phase meter count and the average value of the meter counts rounded down from the above single-phase meters to the medium-phase meter count, and move the meters with the difference between the low-phase meter count and the average value of the meter counts rounded down from the above single-phase meters to the low-phase meter count.

[0062] S302: If the wiring mode of the target user meter is the single-phase meter wiring mode, update the high phase of the target user meter to the low phase, and update the phase parameter values of each phase in the distribution network terminal until the highest phase of the distribution network terminal cannot be further allocated; Specifically, when the target user meter is a single-phase meter, the purpose of performing the phase update operation is to traverse all possible phase allocation schemes to find the optimal solution under the current constraints. During the specific implementation, update the single-phase meter target user meter from the high phase to the low phase, and correspondingly update the phase parameter values in the distribution network terminal: reduce the specific parameters corresponding to the original high phase and increase the specific parameters of the newly allocated low phase. This phase update process continues until the highest phase in the distribution network terminal cannot be further allocated. After each phase update, calculate the updated index data, record the corresponding phase allocation scheme, and finally determine the optimal phase allocation scheme by comparing the data indexes of all schemes.

[0063] For example, when the constraint condition is the minimum voltage unbalance degree, reduce the voltage parameter of the original high voltage phase and increase the voltage parameter of the newly allocated low voltage phase. This phase update process continues until the highest voltage phase of the user meter connected to the distribution network terminal cannot be further allocated. After each phase update, calculate the updated voltage unbalance degree index, record the corresponding phase allocation scheme, and finally determine the optimal phase allocation scheme by comparing the voltage unbalance degree indexes of all schemes.

[0064] S303: If the wiring mode of the target user meter is the three-phase four-wire meter wiring mode, obtain the high parameter phase and the low parameter phase of the target user meter; if the low parameter phase of the target user meter is not equal to the high phase of the distribution network terminal, mark the low parameter phase of the target user meter as the high phase of the distribution network terminal, and update the phase parameter values of the high phase and the low parameter phase; if the high parameter phase of the target user meter is not equal to the low phase of the distribution network terminal, mark the high parameter phase of the target user meter as the low phase of the distribution network terminal, and update the phase parameter values of the low phase and the high parameter phase until the highest phase of the distribution network terminal cannot be further allocated.

[0065] When the target user meter is a three-phase four-wire meter, it is necessary to obtain the parameter conditions of each phase of the meter and find out its high-parameter phase and low-parameter phase. In order to find the optimal phase allocation scheme, it is necessary to traverse different phase adjustment possibilities. During the specific implementation, first, it is judged whether the low-parameter phase of the target user meter is equal to the high phase of the distribution network terminal. If they are not equal, the low-parameter phase of the meter is updated to the high phase of the distribution network terminal, and the parameter values of these two phases are updated at the same time. Secondly, it is judged whether the high-parameter phase of the target user meter is equal to the low phase of the distribution network terminal. If they are not equal, the high-parameter phase of the meter is updated to the low phase of the distribution network terminal, and the parameter values of these two phases are updated. This phase update process continues until the highest phase in the distribution network terminal cannot be allocated anymore. After each phase update, relevant indicators are calculated, and the corresponding phase allocation scheme is recorded.

[0066] S202: Record the phase topology relationship after each phase update, and calculate the index data corresponding to the phase topology relationship according to the load data; Among them, the index data refers to the evaluation parameters reflecting the three-phase load distribution and three-phase voltage balance of the distribution network. In the embodiments of the present application, it can be understood as the specific index values that need to be calculated according to different constraint conditions. For example, when the constraint condition is the minimum line loss power, the index data is the line loss power corresponding to the phase topology relationship after each phase update. When the constraint condition is the minimum voltage unbalance degree, the index data is the voltage unbalance degree corresponding to the phase topology relationship after each phase update. The index data is used to evaluate the quality of the operation state of the distribution network terminal after each phase adjustment.

[0067] During the phase optimization process of the distribution network terminal, after each phase update operation is executed, it is necessary to completely record the connection relationship between the user meter and each phase of the distribution network terminal at this time, that is, the phase topology relationship. This record contains the specific phase information currently connected to each user meter, reflecting the phase distribution state of the user meters in the entire distribution network terminal. Based on the recorded phase topology relationship, combined with the user load data (such as electricity consumption, voltage, etc.) in the system, according to the calculation method specified by the constraint conditions (such as the calculation formulas of three-phase unbalance degree, voltage unbalance degree, etc.), the specific index data corresponding to this topology relationship is calculated.

[0068] On the basis of the above embodiments, as an alternative implementation manner, for the case where the constraint condition is the minimum line loss power, steps S401 - S403 can be used to calculate the corresponding index data.

[0069] Since the time-sharing line loss is difficult to estimate and quantify, the equal-value resistance method of each phase is referred to for calculation, and the line loss situation is evaluated by calculating the ratio of the line loss under the three-phase load unbalanced state to the line loss under the three-phase load balanced state.

[0070] S401: When the constraint condition is the minimum line loss power, calculate the unbalanced line loss power corresponding to the phase topology relationship under the three-phase load unbalanced state according to the load data; In specific implementation, first determine the distribution of users in each phase based on the recorded phase topology relationship, obtain the forward active power data from the load meter at the distribution network terminal, and the calculated time-sharing line loss power is the difference between the forward active power of the terminal at the current moment and the total forward active power of all users at the current moment. This line loss calculation method based on actual power data is intuitive and effective. By calculating the power difference at a certain moment, it can accurately reflect the energy loss caused by load imbalance under the current phase topology relationship. This unbalanced line loss power includes the additional loss caused by three-phase load imbalance and can truly reflect the operation efficiency of the distribution network under the current phase allocation scheme.

[0071] S402: Use the ratio calculation formula to calculate the loss ratio between the three-phase load unbalanced state and the three-phase load balanced state; Among them, the loss ratio between the three-phase load unbalanced state and the three-phase load balanced state refers to the ratio of the loss of the distribution network under the actual three-phase load unbalanced operation state to the loss under the ideal three-phase load balanced state. In the embodiments of the present application, it can be understood as the ratio of the actual three-phase unbalanced loss corresponding to the current phase topology relationship to the ideal three-phase balanced loss calculated by the phase equal-value resistance method under the same total load condition.

[0072] For the calculation of the loss ratio, the following steps can be adopted.

[0073] Determine the phase state of the three-phase load current according to the ratio of each phase current in the three-phase load current to the average value of the three-phase load current. The phase state includes one phase heavy, one phase light, one phase average or one phase heavy, two phases light or two phases heavy, one phase light; Input the three-phase load current and the phase state into the ratio calculation formula to obtain the loss ratio between the three-phase load unbalanced state and the three-phase load balanced state; Among them, the ratio calculation formula is: , ; Among them, represents the loss ratio between the three-phase load unbalanced state and the three-phase load balanced state, represents the three-phase load current unbalance degree, represents the maximum load current of one phase in the three-phase load current, represents the average value of the three-phase load current.

[0074] To accurately calculate the loss ratio between the three-phase load unbalanced state and the three-phase load balanced state, it is necessary to first conduct a detailed analysis of the distribution of the three-phase load currents. During specific implementation, first calculate the average value of the three-phase load currents, which represents the current magnitude that each phase should bear under the ideal state of balanced three-phase loads. Then, calculate the ratios of the actual currents of phases A, B, and C to this average value respectively. Through these ratios, the deviation degree of each phase load from the average level can be quantitatively reflected. Based on the calculated ratios, determine the phase state under the current phase topology relationship.

[0075] Optionally, if the ratio is greater than 1.2, then this phase is considered heavy; if the ratio is within the range of 0.8 - 1.2, then this phase is considered average; if the ratio is less than 0.8, this phase is considered light. After determining the phase state, substitute the three-phase load current data and the corresponding phase state into the ratio calculation formula to calculate the loss ratio between the three-phase load unbalanced state and the three-phase load balanced state.

[0076] This formula is used to calculate the loss ratio between the three-phase load unbalanced state and the three-phase load balanced state, and accurately quantifies the loss situation under different phase states through a rigorous mathematical expression. The calculation formula of the loss ratio is divided into three cases according to different states of the three-phase load distribution.

[0077] Meanwhile, among them represents the maximum value among the three-phase load currents, reflecting the current magnitude of the heaviest loaded phase; represents the average value of the three-phase load currents, representing the current magnitude that each phase should bear under the ideal balanced state. This calculation method characterizes the degree of imbalance through the relative deviation between the maximum phase current and the average current. When the maximum phase current is closer to the average current, the unbalance degree of the three-phase load currents is smaller, indicating that it is closer to the balanced state; conversely, when the gap between the maximum phase current and the average current is larger, the unbalance degree of the three-phase load currents is larger, indicating a more serious degree of imbalance.

[0078] S403: According to the unbalanced line loss power and the loss ratio, calculate the line loss power corresponding to the phase topology relationship. The line loss power is the index data corresponding to the constraint condition with the minimum line loss power.

[0079] Specifically, first, by analyzing the three-phase load currents of the distribution network terminals, the ratios of each phase current to the average value of the three-phase load currents are obtained. Based on these ratios, the phase states of the three-phase load currents are determined, including states such as one phase being heavy, one phase being light, one phase being average, or one phase being heavy, two phases being light, or two phases being heavy, one phase being light, etc. The determined three-phase load currents and their phase states are substituted into the loss ratio calculation formula to obtain the loss ratio between the three-phase load unbalanced state and the three-phase load balanced state. This loss ratio reflects the degree of additional loss caused by three-phase imbalance in the system. Dividing the unbalanced line loss power by the loss ratio can obtain the ideal line loss power corresponding to the balanced state. Then, through phase adjustment, a new phase topology relationship can be obtained, and a new ratio can be calculated to obtain a new line loss power, which is used as the index data under the constraint condition of the minimum line loss power.

[0080] In the step of calculating the index data in S202 above, the calculation method of the index data under the constraint condition of the minimum line loss power is given above. Below, the calculation methods of the index data under other constraint conditions are specifically given.

[0081] Specifically, when the constraint condition is the minimum load unbalance degree, the three-phase load unbalance degree is used as the index data; The load data is input into the calculation formula of the load balance degree quantization index to obtain the three-phase load unbalance degree corresponding to the phase topology relationship; The calculation formula of the load balance degree quantization index is: ; Among them, represents the three-phase load unbalance degree, represents the active power of phase A at time k, represents the active power of phase B at time k; represents the active power of phase C at time k; represents the average value of the three-phase active power at time k, and k represents the time corresponding to each phase update.

[0082] Specifically, in the formula, first, the absolute values of the differences in active power between adjacent two phases 、 and are calculated. These three differences respectively reflect the load power deviations between phase A and phase B, phase B and phase C, and phase A and phase C. By taking the maximum value of these three differences, the most serious inter-phase power imbalance degree existing in the system can be obtained, and this maximum difference directly reflects the maximum deviation of the system load distribution.

[0083] To make the calculation results comparable and universal, the formula divides the maximum power difference by the average value of the three-phase active power Perform normalization processing. This processing method eliminates the influence of the absolute power magnitude, enabling the lateral comparison of the load imbalance degrees after different phase updates. Finally, multiply by 100% to convert the result into a percentage form, making the evaluation result more intuitive. When the calculated value is smaller, it indicates that the three-phase load distribution is more balanced; conversely, a larger value indicates that there is an obvious load imbalance phenomenon in the system.

[0084] Specifically, when the constraint condition is the minimum current imbalance degree, use the three-phase current imbalance degree as the index data; Input the load data into the calculation formula of the current balance degree quantization index to obtain the three-phase current imbalance degree corresponding to the phase topology relationship; The calculation formula of the current balance degree quantization index is: ; Among them, represents the three-phase current imbalance degree, represents the current of phase A at time k; represents the current of phase B at time k; represents the current of phase C at time k; represents the average value of the three-phase current at time k, and k represents the time corresponding to each phase update.

[0085] Specifically, the imbalance degree is quantified by analyzing the current deviation between the three phases. Among them, , and respectively calculate the current difference between any two phases. By taking the maximum value, the most significant current deviation in the system can be captured. Then, adopt the normalization processing method, divide the maximum current difference by the average value of the three-phase current . This processing method makes the evaluation results under different operating conditions comparable. The final result expressed in percentage form intuitively reflects the current imbalance degree of the system.

[0086] Specifically, when the constraint condition is the minimum voltage imbalance degree, use the three-phase voltage imbalance as the index data; Input the load data into the calculation formula of the voltage balance degree quantization index to obtain the three-phase voltage imbalance degree corresponding to the phase topology relationship; The calculation formula of the voltage balance degree quantization index is: ; Among them, represents the three-phase voltage imbalance degree, represents the voltage of phase A at time k; represents the voltage of phase B at time k; represents the voltage of phase C at time k; represents the average value of the three-phase voltage at time k, where k represents the time corresponding to each phase update.

[0087] In the calculation formula of the voltage balance quantization index, since it is difficult to estimate the influence of user phase adjustment on the terminal voltage, we transform the goal of terminal voltage balance into the balance of the phase voltages of the user corresponding to the terminal phase, that is, calculate the voltage unbalance of the three phases A, B, and C corresponding to the user meter at the terminal. According to the phase identification result of the user meter and the user voltage data, obtain all the meters and voltages connected to the terminal phases A, B, and C respectively, and calculate the average value of each phase voltage and and .

[0088] By calculating the absolute value of the voltage difference between each phase, and then taking the maximum value from these absolute values of the voltage differences between phases, this directly reflects the most significant voltage imbalance phenomenon in the system. Then divide the maximum voltage difference by the average value of the three-phase voltage for normalization processing, so as to be able to directly compare the index data after each phase update, which is convenient for subsequent determination of the optimal phase solution with the smallest three-phase voltage unbalance degree.

[0089] Specifically, when the constraint condition is the minimum meter count unbalance degree, take the meter count unbalance degree as the index data; Input the load data into the calculation formula of the user number balance quantization index to obtain the meter count unbalance degree corresponding to the phase topology relationship; The calculation formula of the user number balance quantization index is: ； where, represents the meter count unbalance degree; represents the meter count connected to phase A of the distribution network terminal; represents the meter count connected to phase B of the distribution network terminal; represents the meter count connected to phase C of the distribution network terminal; represents the average value of the meter counts connected to the three phases of the distribution network terminal, and k represents the time after each phase update.

[0090] In the calculation formula of the user number balance quantization index, by calculating and and the absolute values of these three groups of differences respectively reflect the differences in the number of meters between phase A and phase B, phase B and phase C, and phase A and phase C. Use the max function to select the maximum value among these three differences, aiming to identify the most unbalanced situation of the meter distribution among the three phases. This maximum difference directly reflects the most serious user distribution imbalance degree existing in the system. And Represents the average value of the meter readings on the three phases of the distribution network terminal, that is ( + + ) / 3 , the maximum difference is divided by the average value for normalization, so that the imbalance degree between distribution network terminals with different user scales can be compared horizontally. Finally, multiply by 100% to convert the result into a percentage form to make the evaluation result more intuitive.

[0091] Through the difference analysis of the meter readings of each phase, the imbalance degree of user distribution can be accurately quantified. When the calculated meter reading imbalance degree The smaller the value, the more balanced the user distribution; on the contrary, it indicates that there is an obvious imbalance in the user distribution in the system.

[0092] S203: Determine the phase topology relationship corresponding to the optimal solution of the index data as the phase allocation result corresponding to the current constraint condition.

[0093] After recording the phase topology relationship and calculating the index data after each phase update, it is necessary to select the optimal phase allocation result from these phase topology relationships. Since the optimization objectives under different constraint conditions are different, it is necessary to select the corresponding optimal solution for each constraint condition. Specifically, when the constraint condition is the minimum line loss power, by comparing the line loss power values corresponding to all phase topology relationships, select the phase topology relationship with the minimum line loss power as the phase allocation result under this constraint condition; when the constraint condition is the minimum load imbalance degree, by comparing the three-phase load imbalance degree values corresponding to all phase topology relationships, select the phase topology relationship with the minimum three-phase load imbalance degree as the phase allocation result under this constraint condition; when the constraint condition is the minimum current imbalance degree, by comparing the three-phase current imbalance degree values corresponding to all phase topology relationships, select the phase topology relationship with the minimum three-phase current imbalance degree as the phase allocation result under this constraint condition; when the constraint condition is the minimum voltage imbalance degree, by comparing the three-phase voltage imbalance degree values corresponding to all phase topology relationships, select the phase topology relationship with the minimum three-phase voltage imbalance degree as the phase allocation result under this constraint condition; when the constraint condition is the minimum meter reading imbalance degree, by comparing the meter reading imbalance degree values corresponding to all phase topology relationships, select the phase topology relationship with the minimum meter reading imbalance degree as the phase allocation result under this constraint condition.

[0094] S103: Construct a multi-objective function of line loss power, load imbalance degree, current imbalance degree, voltage imbalance degree, and meter reading imbalance degree.

[0095] To ensure the implementation of the technical solution provided by this application, this application presents a multi-objective function.

[0096]

[0097]

[0098] Among them, 、 、 、 、 respectively represent line loss power, load unbalance degree, current unbalance degree, voltage unbalance degree, and meter count unbalance degree. 、 、 、 、 Then, they respectively represent the weight coefficients of line loss power, load unbalance degree, current unbalance degree, voltage unbalance degree, and meter count unbalance degree.

[0099] Considering the actual engineering limit requirements of each index, constraint conditions of not exceeding 10% and 5% are respectively imposed on the current unbalance degree and voltage unbalance degree, and at the same time, all indexes are required to be non-negative values. The optimization goal of the multi-objective function is to minimize the sum of the weighted indexes, that is, to find the phase allocation scheme that makes the objective function obtain the minimum value under the premise of meeting the constraint conditions.

[0100] S104: Calculate the multi-objective function values corresponding to each phase allocation result according to the multi-objective function, and determine the phase allocation result corresponding to the minimum multi-objective function value as the optimal phase allocation result.

[0101] In specific implementation, first obtain the optimal phase connection schemes respectively obtained under the five constraint conditions of minimum line loss power, minimum load unbalance degree, minimum current unbalance degree, minimum voltage unbalance degree, and minimum meter count unbalance degree. These schemes are obtained through phase update iteration calculation of the initial phase topology relationship, and the connection states between the user meters and each phase of the distribution network terminal are detailedly recorded. Then, substitute the performance index values corresponding to these five phase connection schemes into the constructed multi-objective function for calculation. By calculating and comparing the multi-objective function values corresponding to these five schemes, select the phase allocation scheme with the minimum multi-objective function value as the final optimal phase allocation result.

[0102] S105: Generate a phase adjustment plan for the distribution network terminal and low-voltage side users according to the optimal phase allocation result.

[0103] The optimal phase allocation result is obtained by evaluating the phase allocation plans under five constraint conditions of minimum line loss power, minimum load imbalance degree, minimum current imbalance degree, minimum voltage imbalance degree, and minimum meter count imbalance degree through a multi-objective function. It records the optimal connection relationship between the user meters and each phase of the distribution network terminal. When generating a specific phase adjustment plan, it is first necessary to compare the optimal phase allocation result with the actual phase connection status of the current distribution network to determine the user meters that need to be phase-adjusted. Subsequently, a detailed phase adjustment execution plan is formulated according to the comparison result, specifying which target phase each user meter to be adjusted should switch from the currently connected phase to.

[0104] The following is an embodiment of the system of the present application, which can be used to execute the method embodiment of the present application. For details not disclosed in the system embodiment of the present application, please refer to the method embodiment of the application.

[0105] Please refer to Figure 2 , which shows a schematic structural diagram of a three-phase balanced user phase adjustment system based on multi-objective optimization control provided by an exemplary embodiment of the present application. This system can be implemented as all or part of the system through software, hardware, or a combination of both. The three-phase balanced user phase adjustment system based on multi-objective optimization control includes: A data processing module, configured to obtain the load data of the distribution network terminal and low-voltage side users, and identify the initial phase topology relationship according to the load data; A first calculation module, configured to calculate the phase allocation results corresponding to different constraint conditions respectively according to the load data and the initial phase topology relationship, and the constraint conditions are minimum line loss power, minimum load imbalance degree, minimum current imbalance degree, minimum voltage imbalance degree, and minimum meter count imbalance degree; A function construction module, configured to construct a multi-objective function of line loss power, load imbalance degree, current imbalance degree, voltage imbalance degree, and meter count imbalance degree; A second calculation module, configured to calculate the multi-objective function values corresponding to each phase allocation result respectively according to the multi-objective function, and determine the phase allocation result corresponding to the minimum multi-objective function value as the optimal phase allocation result; A plan generation module, configured to generate a phase adjustment plan for the distribution network terminal and low-voltage side users according to the optimal phase allocation result.

[0106] Based on the above embodiments, as an alternative embodiment, the first calculation module is further configured to update the phase of the initial phase topology relationship based on the wiring method of the target user meter until the highest phase of the distribution network terminal cannot be further allocated; record the phase topology relationship after each phase update, and calculate the index data corresponding to the phase topology relationship according to the load data; determine the phase topology relationship corresponding to the optimal solution of the index data as the phase allocation result corresponding to the current constraint conditions.

[0107] Based on the above embodiments, as an alternative embodiment, when the constraint condition is the minimum line loss power, the first calculation module is further configured to calculate the unbalanced line loss power corresponding to the phase topology relationship in the three-phase load unbalanced state according to the load data; use the ratio calculation formula to calculate the loss ratio between the three-phase load unbalanced state and the three-phase load balanced state; calculate the line loss power corresponding to the phase topology relationship according to the unbalanced line loss power and the loss ratio, and the line loss power is the index data corresponding to the constraint condition of the minimum line loss power.

[0108] Based on the above embodiments, as an alternative embodiment, the first calculation module is further configured to determine the phase state of the three-phase load current according to the ratio of each phase current in the three-phase load current to the average value of the three-phase load current. The phase state includes one phase heavy, one phase light, one phase average or one phase heavy, two phases light or two phases heavy, one phase light; input the three-phase load current and the phase state into the ratio calculation formula to obtain the loss ratio between the three-phase load unbalanced state and the three-phase load balanced state; wherein, the ratio calculation formula is: ， ; wherein, represents the loss ratio between the three-phase load unbalanced state and the three-phase load balanced state, represents the unbalance degree of the three-phase load current, represents the maximum phase load current in the three-phase load current, represents the average value of the three-phase load current.

[0109] Based on the above embodiments, as an alternative embodiment, the first calculation module is further configured to determine the wiring mode of the target user meter; if the wiring mode of the target user meter is a single-phase meter wiring mode, update the high phase of the target user meter to the low phase, and update the phase parameter values of each phase in the distribution network terminal until the highest phase of the distribution network terminal cannot be further allocated; if the wiring mode of the target user meter is a three-phase four-wire meter wiring mode, obtain the high-parameter phase and the low-parameter phase of the target user meter; if the low-parameter phase of the target user meter is not equal to the high phase of the distribution network terminal, mark the low-parameter phase of the target user meter as the high phase of the distribution network terminal, and update the phase parameter values of the high phase and the low-parameter phase; if the high-parameter phase of the target user meter is not equal to the low phase of the distribution network terminal, mark the high-parameter phase of the target user meter as the low phase of the distribution network terminal, and update the phase parameter values of the low phase and the high-parameter phase until the highest phase of the distribution network terminal cannot be further allocated.

[0110] Based on the above embodiments, as an alternative embodiment, the first calculation module is further configured to determine the user meters connected to the high phase of the distribution network terminal according to the initial phase topology relationship; calculate the phase parameter difference between the high-phase parameter value and the average phase parameter value in the distribution network terminal, and determine the user meter closest to the phase parameter difference as the target user meter.

[0111] Based on the above embodiments, as an alternative embodiment, when the constraint condition is the minimum load unbalance degree, the first calculation module uses the three-phase load unbalance degree as the index data; inputs the load data into the load balance degree quantization index calculation formula to obtain the three-phase load unbalance degree corresponding to the phase topology relationship; the load balance degree quantization index calculation formula is: ; where, represents the three-phase load unbalance degree, represents the active power of phase A at time k, represents the active power of phase B at time k; represents the active power of phase C at time k; represents the average value of the three-phase active power at time k, and k represents the time after each phase update.

[0112] Based on the above embodiments, as an alternative embodiment, when the constraint condition is the minimum current unbalance degree, the first calculation module uses the three-phase current unbalance degree as the index data; inputs the load data into the current balance degree quantization index calculation formula to obtain the three-phase current unbalance degree corresponding to the phase topology relationship; the current balance degree quantization index calculation formula is: ; where, Indicates the three-phase current unbalance degree, represents the current of phase A at time k; represents the current of phase B at time k; represents the current of phase C at time k; represents the average value of the three-phase current at time k, and k represents the time after each phase update.

[0113] Based on the above embodiments, as an alternative embodiment, the first calculation module is further configured to use the three-phase voltage unbalance as the index data when the constraint condition is the minimum voltage unbalance degree; input the load data into the calculation formula of the three-phase voltage unbalance degree quantization index for the voltage balance degree, and obtain the three-phase voltage unbalance degree corresponding to the phase topology relationship; the calculation formula of the three-phase voltage unbalance degree quantization index for the voltage balance degree is: ; wherein, represents the three-phase voltage unbalance degree, represents the voltage of phase A at time k; represents the voltage of phase B at time k; represents the voltage of phase C at time k; represents the average value of the three-phase voltage at time k, and k represents the time after each phase update.

[0114] Based on the above embodiments, as an alternative embodiment, the first calculation module is further configured to use the meter count unbalance degree as the index data when the constraint condition is the minimum meter count unbalance degree; input the load data into the calculation formula of the user number balance degree quantization index for the meter count, and obtain the meter count unbalance degree corresponding to the phase topology relationship; the calculation formula of the user number balance degree quantization index for the meter count is: ; wherein, represents the meter count unbalance degree; represents the meter count connected to phase A of the distribution network terminal; represents the meter count connected to phase B of the distribution network terminal; represents the meter count connected to phase C of the distribution network terminal; represents the average value of the meter counts connected to the three phases of the distribution network terminal, and k represents the time after each phase update.

[0115] The embodiments of the present application further provide a computer storage medium, which can store multiple instructions. The instructions are suitable for being loaded and executed by a processor to perform the three-phase balanced user phase adjustment method based on multi-objective optimization control as described in the above embodiments. The specific execution process can refer to the specific description of the embodiments and will not be elaborated here.

[0116] Please refer to Figure 3, This application embodiment provides a schematic structural diagram of an electronic device. As Figure 3 shown, the electronic device 300 may include: at least one processor 301, at least one network interface 304, a user interface 303, a memory 305, and at least one communication bus 302.

[0117] Among them, the communication bus 302 is used to realize the connection and communication between these components.

[0118] Among them, the user interface 303 may include a standard wired interface and a wireless interface.

[0119] Among them, the network interface 304 may optionally include a standard wired interface and a wireless interface (such as a WI-FI interface).

[0120] Among them, the processor 301 may include one or more processing cores. The processor 301 uses various interfaces and lines to connect various parts within the entire server. By running or executing instructions, programs, code sets, or instruction sets stored in the memory 305, and by calling data stored in the memory 305, it executes various functions of the server and processes data. Optionally, the processor 301 may be implemented in at least one hardware form of digital signal processing (DSP), field-programmable gate array (FPGA), or programmable logic array (PLA). The processor 301 may integrate a combination of one or several of a central processing unit (CPU), a graphics processing unit (GPU), and a modem, etc. Among them, the CPU mainly processes the operating system, user interface, and application programs, etc.; the GPU is responsible for rendering and drawing the content to be displayed on the display screen; the modem is used to process wireless communication. It can be understood that the above modem may not be integrated into the processor 301 and may be implemented separately by a single chip.

[0121] Among them, the memory 305 may include a Random Access Memory (RAM), or may also include a Read-Only Memory. Optionally, the memory 305 includes a non-transitory computer-readable storage medium. The memory 305 can be used to store instructions, programs, codes, code sets or instruction sets. The memory 305 may include a program storage area and a data storage area. Among them, the program storage area can store instructions for implementing the operating system, instructions for at least one function (such as touch function, sound playback function, image playback function, etc.), instructions for implementing the above-mentioned various method embodiments, etc.; the data storage area can store the data involved in the above-mentioned various method embodiments. Optionally, the memory 305 may also be at least one storage device located far from the aforementioned processor 301. As Figure 3 shown, in the memory 305 as a computer storage medium, there may be included an operating system, a network communication module, a user interface module, and an application program of a three-phase balanced user phase adjustment method based on multi-objective optimization control.

[0122] In Figure 3 the electronic device 300 shown, the user interface 303 is mainly used to provide an input interface for the user to obtain the data input by the user; while the processor 301 can be used to call the application program of a three-phase balanced user phase adjustment method stored in the memory 305. When executed by one or more processors, the electronic device is caused to execute the method as described in one or more of the above embodiments.

[0123] An electronic device-readable storage medium stores instructions. When executed by one or more processors, the electronic device is caused to execute the method as described in one or more of the above embodiments.

[0124] It should be noted that for the foregoing method embodiments, for the sake of simple description, they are all expressed as a series of action combinations. However, those skilled in the art should know that this application is not limited by the described action sequence, because according to this application, certain steps can be performed in other sequences or simultaneously. Secondly, those skilled in the art should also know that the embodiments described in the specification are all preferred embodiments, and the actions and modules involved are not necessarily essential to this application.

[0125] In the above embodiments, the descriptions of the various embodiments have their own emphases. For the parts not detailed in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0126] In several embodiments provided by the present application, it should be understood that the disclosed device can be implemented in other ways. For example, the device embodiments described above are merely illustrative. For example, the division of units is only a logical function division. In actual implementation, there may be other division methods. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the displayed or discussed couplings or direct couplings or communication connections between each other can be through some service interfaces. The indirect couplings or communication connections of devices or units can be in electrical or other forms.

[0127] The units described as separate components may or may not be physically separated. The components shown as units may or may not be physical units, that is, they may be located in one place, or they may be distributed to multiple network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0128] In addition, in each embodiment of the present application, the functional units can be integrated into one processing unit, or each unit can exist physically alone, or two or more units can be integrated into one unit. The above-mentioned integrated units can be implemented in the form of hardware or in the form of software functional units.

[0129] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable memory. Based on this understanding, the technical solution of the present application, in essence, or the part that contributes to the prior art, or all or part of this technical solution, can be embodied in the form of a software product. This computer software product is stored in a memory and includes several instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods in each embodiment of the present application. And the aforementioned memory includes: various media such as USB flash drives, mobile hard disks, magnetic disks, or optical discs that can store program codes.

[0130] The above are only exemplary embodiments of the present disclosure, and the scope of the present disclosure cannot be limited thereby. That is, all equivalent changes and modifications made in accordance with the teachings of the present disclosure still fall within the scope covered by the present disclosure. Those skilled in the art will easily think of other implementation schemes of the present disclosure after considering the specification and the disclosure of the practical truth. The present application aims to cover any variations, uses, or adaptive changes of the present disclosure, and these variations, uses, or adaptive changes follow the general principles of the present disclosure and include the common general knowledge or conventional technical means in the technical field not recorded in the present disclosure.

Claims

1. A three-phase balanced user phase adjustment method based on multi-objective optimization control, characterized in that The method includes: Obtaining the load data of the distribution network terminal and the low-voltage side users, and identifying the initial phase topology relationship according to the load data; Calculating the phase allocation results corresponding to different constraint conditions respectively according to the load data and the initial phase topology relationship, where the constraint conditions are the minimum line loss power, the minimum load imbalance degree, the minimum current imbalance degree, the minimum voltage imbalance degree, and the minimum meter count imbalance degree; Constructing a multi-objective function of line loss power, load imbalance degree, current imbalance degree, voltage imbalance degree, and meter count imbalance degree; Calculating the multi-objective function values corresponding to each of the phase allocation results respectively according to the multi-objective function, and determining the phase allocation result corresponding to the minimum multi-objective function value as the optimal phase allocation result; Generating a phase adjustment plan for the distribution network terminal and the low-voltage side users according to the optimal phase allocation result.

2. The method according to claim 1, characterized in that The calculating the phase allocation results corresponding to different constraint conditions respectively according to the load data and the initial phase topology relationship includes: Performing phase update on the initial phase topology relationship based on the wiring mode of the target user meter until the highest phase of the distribution network terminal cannot be allocated continuously; Recording the phase topology relationship after each phase update, and calculating the index data corresponding to the phase topology relationship according to the load data; Determining the phase topology relationship corresponding to the optimal solution of the index data as the phase allocation result corresponding to the current constraint condition.

3. The method according to claim 2, characterized in that The recording the phase topology relationship after each phase update, and calculating the index data corresponding to the phase topology relationship according to the load data includes: When the constraint condition is the minimum line loss power, calculating the unbalanced line loss power corresponding to the phase topology relationship in the three-phase load unbalanced state according to the load data; Calculating the loss ratio between the three-phase load unbalanced state and the three-phase load balanced state using a ratio calculation formula; Calculating the line loss power corresponding to the phase topology relationship according to the unbalanced line loss power and the loss ratio, where the line loss power is the index data corresponding to the constraint condition of the minimum line loss power.

4. The method according to claim 3, wherein The calculating the loss ratio between the three-phase load unbalanced state and the three-phase load balanced state using a ratio calculation formula includes: Determining the phase state of the three-phase load current according to the ratio of each phase current in the three-phase load current to the average value of the three-phase load current, where the phase state includes one phase heavy, one phase light, one phase average, or one phase heavy, two phases light, or two phases heavy, one phase light; Inputting the three-phase current imbalance degree and the phase state into the ratio calculation formula to obtain the loss ratio between the three-phase load unbalanced state and the three-phase load balanced state; Wherein, the ratio calculation formula is: ， ； Among them, represents the loss ratio between the three-phase load unbalance state and the three-phase load balance state, represents the three-phase load current unbalance degree, represents the load current of the largest phase among the three-phase load currents, represents the average value of the three-phase load currents.

5. The method according to claim 2, wherein The performing phase update on the initial phase topology relationship based on the wiring mode of the target user meter until the highest phase of the distribution network terminal cannot be allocated continuously includes: Judging the wiring mode of the target user meter; If the wiring method of the target user meter is a single-phase meter wiring method, update the high phase of the target user meter to the low phase, and update the phase parameter values of each phase in the distribution network terminal until the highest phase of the distribution network terminal cannot be further allocated; If the wiring method of the target user meter is a three-phase four-wire meter wiring method, obtain the high parameter phase and the low parameter phase of the target user meter; if the low parameter phase of the target user meter is not equal to the high phase of the distribution network terminal, mark the low parameter phase of the target user meter as the high phase of the distribution network terminal, and update the phase parameter values of the high phase and the low parameter phase; if the high parameter phase of the target user meter is not equal to the low phase of the distribution network terminal, mark the high parameter phase of the target user meter as the low phase of the distribution network terminal, and update the phase parameter values of the low phase and the high parameter phase until the highest phase of the distribution network terminal cannot be further allocated.

6. The method according to claim 5, wherein Before determining the wiring method of the user meter, it further includes: Determine the user meters connected to the high phase of the distribution network terminal according to the initial phase topology relationship; Calculate the phase parameter difference between the high phase parameter value and the average phase parameter value in the distribution network terminal, and determine the user meter closest to the phase parameter difference as the target user meter.

7. The method according to claim 2, wherein Calculating the index data corresponding to the phase topology relationship according to the load data includes: When the constraint condition is the minimum load unbalance degree, use the three-phase load unbalance degree as the index data; Input the load data into the load balance degree quantization index calculation formula to obtain the three-phase load unbalance degree corresponding to the phase topology relationship; The load balance degree quantization index calculation formula is: ； Among them, represents the three-phase load unbalance degree, represents the active power of phase A at time k, represents the active power of phase B at time k; represents the active power of phase C at time k; represents the average value of the three-phase active power at time k, and k represents the corresponding time at each phase update.

8. The method according to claim 2, wherein Calculating the index data corresponding to the phase topology relationship according to the load data includes: When the constraint condition is the minimum current unbalance degree, use the three-phase current unbalance degree as the index data; Input the load data into the current balance degree quantization index calculation formula to obtain the three-phase current unbalance degree corresponding to the phase topology relationship; The current balance degree quantization index calculation formula is: ； Among them, represents the unbalance degree of the three-phase current, represents the current of phase A at time k; represents the current of phase B at time k; represents the current of phase C at time k; represents the average value of the three-phase current at time k, and k represents the corresponding time at each phase update.

9. The method according to claim 2, wherein Calculating the index data corresponding to the phase topology relationship according to the load data includes: When the constraint condition is the minimum voltage unbalance degree, use the three-phase voltage unbalance as the index data; Input the load data into the voltage balance degree quantization index calculation formula to obtain the three-phase voltage unbalance degree corresponding to the phase topology relationship; The voltage balance degree quantization index calculation formula is: ； Among them, represents the three-phase voltage unbalance degree, represents the voltage of phase A at time k; represents the voltage of phase B at time k; represents the voltage of phase C at time k; represents the average value of the three-phase voltage at time k, and k represents the corresponding time at each phase update.

10. The method according to claim 2, wherein Calculating the index data corresponding to the phase topology relationship according to the load data includes: When the constraint condition is the minimum meter count unbalance degree, use the meter count unbalance degree as the index data; Input the load data into the user number balance degree quantization index calculation formula to obtain the meter count unbalance degree corresponding to the phase topology relationship; The user number balance degree quantization index calculation formula is: ； Among them, represents the unbalance degree of the meter count; represents the meter count connected to the A-phase of the distribution network terminal; represents the meter count connected to the B-phase of the distribution network terminal; represents the meter count connected to the C-phase of the distribution network terminal; represents the average value of the meter counts connected to the three phases of the distribution network terminal, and k represents the corresponding moment at each phase update.

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