A three-phase balanced user phase adjustment method based on multi-objective optimization control

Abstract

The present application provides a three-phase balanced user phase adjustment method based on multi-objective optimization control, which relates to the field of power system control technology. The technical solution provided by the present application can avoid the problem of deterioration of other indicators that may be caused by single-objective optimization by constructing a multi-objective function including the above-mentioned indicators after calculating the phase allocation results under different constraints. 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 the 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 the present 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.

Description

Technical Field

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

[0002] With the continued growth of electricity demand, the problem of three-phase load imbalance in low-voltage distribution networks has become increasingly prominent. The power load balancing system of a low-voltage distribution network distributes the load across each phase to ensure the most balanced three-phase current or power. The increasing number of residential electrical devices and the diversification of load types have led to three-phase load imbalance, resulting in excessive neutral current, increased system losses, and reduced power quality. Therefore, power load balancing is necessary to improve power supply quality and efficiency.

[0003] Currently, a common method for power load balancing is to achieve dynamic balancing of the three-phase load by redistributing the load connected to the low-voltage distribution network to each phase through switching devices while maintaining uninterrupted power supply. However, this method only aims to ensure that the current or power imbalance is less than a certain threshold, and the target object is limited to single-phase metering. However, in actual application, this method is affected by the time-varying characteristics of the load and the user's electricity usage patterns, resulting in inaccurate phase adjustment results and poor load balancing results. Summary of the Invention

[0004] The present 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, the present application provides a three-phase balanced user phase adjustment method based on multi-objective optimization control, the method comprising:

[0006] Obtaining load data of distribution network terminals and low-voltage side users, and identifying an initial phase topology relationship based on the load data;

[0007] Calculating phase allocation results corresponding to different constraints based on the load data and the initial phase topology, wherein the constraints are minimum line loss, minimum load imbalance, minimum current imbalance, minimum voltage imbalance, and minimum meter count imbalance;

[0008] Construct a multi-objective function for line loss, load imbalance, current imbalance, voltage imbalance, and meter count imbalance;

[0009] Calculating the multi-objective function values ​​corresponding to 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;

[0010] A phase adjustment plan for the distribution network terminal and the low-voltage side user is generated according to the optimal phase allocation result.

[0011] 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.

[0012] Optionally, the calculating, based on the load data and the initial phase topology relationship, phase allocation results corresponding to different constraint conditions respectively includes:

[0013] 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;

[0014] 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;

[0015] 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.

[0016] 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.

[0017] 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:

[0018] 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;

[0019] Use the ratio calculation formula to calculate the loss ratio between the three-phase load unbalanced state and the three-phase load balanced state;

[0020] The line loss amount corresponding to the phase topology relationship is calculated according to the unbalanced line loss amount and the loss ratio, where the line loss amount is indicator data corresponding to the constraint condition for minimizing the line loss amount.

[0021] By adopting the above technical solution, when the constraint condition is to minimize line loss, the unbalanced line loss corresponding to the phase topology relationship under the three-phase load imbalance state is first calculated based on the load data. Then, the loss ratio of the three-phase load imbalance state to the three-phase load balanced state is obtained through the ratio calculation formula. Finally, based on the unbalanced line loss and loss ratio, the line loss corresponding to the phase topology relationship is calculated as the indicator data corresponding to the constraint condition. This calculation method not only considers the actual line loss under the load imbalance state, but also introduces the loss ratio to the ideal balanced state as an evaluation parameter. Through the comprehensive calculation of these two dimensions, it can more accurately reflect the impact of the phase topology relationship on line loss.

[0022] Optionally, the use of a ratio calculation formula to calculate the loss ratio between the three-phase load unbalanced state and the three-phase load balanced state includes:

[0023] Determining a phase state of the three-phase load current according to a ratio of each phase current in the three-phase load current to an average value of the three-phase load current, wherein the phase state includes one phase being heavy, one phase being light, one phase being average, one phase being heavy, two phases being light, or two phases being heavy, one phase being light;

[0024] Inputting the three-phase load current and the phase state into a ratio calculation formula to obtain a loss ratio between a three-phase load unbalanced state and a three-phase load balanced state;

[0025] Wherein, the ratio calculation formula is:

[0026] , ;

[0027] in, Indicates the loss ratio between the three-phase load unbalanced state and the three-phase load balanced state. Indicates the unbalance degree of three-phase load current. Indicates the maximum single-phase load current among the three-phase load currents, Represents the average value of the three-phase load current.

[0028] By employing the above technical solution, the ratio of each phase current to the average value of the three-phase load current is compared, enabling accurate judgment of the phase state of the three-phase load current, including multiple states such as one phase heavy, one phase light, one phase average, one phase heavy, two phases light, or two phases heavy, one phase light. Furthermore, by substituting the three-phase load current and phase state into the ratio calculation formula, a quantitative relationship between the loss ratio of the three-phase load unbalanced state and the three-phase load balanced state is established. This ratio calculation formula incorporates the three-phase load current imbalance and the relationship between the maximum single-phase load current and the average value, accurately reflecting the impact of load imbalance on line losses.

[0029] Optionally, the updating of the initial phase topology relationship based on the connection mode of the target user meter until the highest phase of the distribution network terminal can no longer be allocated includes:

[0030] Determining the wiring mode of the target user meter;

[0031] If the connection mode of the target user meter is a single-phase meter connection mode, the high phase of the target user meter is updated to a low phase, and the phase parameter values ​​of each phase in the distribution network terminal are updated until the highest phase of the distribution network terminal can no longer be allocated;

[0032] If the connection mode of the target user meter is a three-phase four-wire meter connection mode, the high parameter phase and the low parameter phase of the target user meter are obtained; if the low parameter phase of the target user meter is not equal to the high phase of the distribution network terminal, the low parameter phase of the target user meter is marked as the high phase of the distribution network terminal, and the phase parameter values ​​of the high phase and the low parameter phase are updated; if the high parameter phase of the target user meter is not equal to the low phase of the distribution network terminal, the high parameter phase of the target user meter is marked as the low phase of the distribution network terminal, and the phase parameter values ​​of the low phase and the high parameter phase are updated until the highest phase of the distribution network terminal can no longer be allocated.

[0033] By adopting the above technical solution, for the single-phase meter wiring method, dynamic phase adjustment is achieved 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. For the three-phase four-wire meter wiring method, the solution obtains the high parameter phase and low parameter phase of the target user meter, and performs corresponding marking and parameter value updates based on their relationship with the high phase and low phase of the distribution network terminal, thereby achieving phase optimization in more complex scenarios. This phase update method based on the characteristics of the wiring method not only takes into account the actual wiring situation of the user meter, but also continuously adjusts the phase parameters until the highest phase of the distribution network terminal can no longer be allocated, thereby ensuring the feasibility and rationality of the phase adjustment scheme.

[0034] Optionally, determining a user meter connected to a high phase of the distribution network terminal according to the initial phase topology relationship;

[0035] A phase parameter difference between a high phase parameter value and a phase parameter average value in the distribution network terminal is calculated, and the user meter closest to the phase parameter difference is determined as the target user meter.

[0036] By employing this technical solution, the user meters connected to the high phase of the distribution network terminal are determined based on the initial phase topology. The difference between the high phase parameter value at the distribution network terminal and the average phase parameter value is then calculated, and the user meter closest to this difference is selected as the target user meter. This parameter difference-based target user meter selection method prioritizes the user meters that most significantly contribute to phase imbalance, improving the accuracy of subsequent phase allocation results.

[0037] Optionally, calculating the index data corresponding to the phase topology relationship according to the load data includes:

[0038] When the constraint condition is that the load imbalance is minimum, the three-phase load imbalance is used as the indicator data;

[0039] Inputting the load data into a load balancing quantitative index calculation formula to obtain a three-phase load imbalance corresponding to the phase topology relationship;

[0040] The calculation formula for the load balancing quantification index is:

[0041] ;

[0042] in, Indicates the three-phase load imbalance, 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; It represents the mean value of the three-phase active power at time k, where k represents the time corresponding to each phase update.

[0043] By adopting the above technical solution and the evaluation method based on the quantitative index of load balancing, not only the deviation of the active power of each phase from the mean is taken into account, but also the dynamic monitoring of the phase update process is realized by introducing the k parameter at the time after the phase update, so that the three-phase load distribution after each phase adjustment can be accurately reflected.

[0044] Optionally, calculating the index data corresponding to the phase topology relationship according to the load data includes:

[0045] When the constraint condition is that the current unbalance is minimum, the three-phase current unbalance is used as the indicator data;

[0046] Inputting the load data into a current balance quantification index calculation formula to obtain a three-phase current imbalance corresponding to the phase topology relationship;

[0047] The current balancing quantitative index calculation formula is:

[0048] ;

[0049] in, Indicates the three-phase current imbalance, 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; It represents the mean value of the three-phase current at time k, where k represents the time corresponding to each phase update.

[0050] By adopting the above technical solution, not only the deviation of each phase current from the mean is taken into account, but also the dynamic tracking of the phase update process is achieved by introducing the time k after the phase update, thereby accurately reflecting the three-phase current balance status after each phase adjustment, providing a reliable quantitative basis for selecting the optimal phase allocation scheme.

[0051] Optionally, calculating the index data corresponding to the phase topology relationship according to the load data includes:

[0052] When the constraint condition is that the voltage imbalance is minimum, the three-phase voltage imbalance is used as the indicator data;

[0053] Inputting the load data into a voltage balance quantification indicator calculation formula to obtain a three-phase voltage imbalance corresponding to the phase topology relationship;

[0054] The voltage balancing quantification index calculation formula is:

[0055] ;

[0056] in, Indicates the three-phase voltage unbalance, 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 mean three-phase voltage at time k, where k represents the time corresponding to each phase update.

[0057] By adopting the above technical solution and the evaluation method based on the quantitative index of voltage balance, not only the deviation of each phase voltage from the mean is considered, but also the dynamic tracking of the phase update process is achieved by introducing the time k parameter, thereby accurately reflecting the three-phase voltage balance status after each phase adjustment, and providing a reliable quantitative basis for selecting the optimal phase allocation scheme.

[0058] Optionally, calculating the index data corresponding to the phase topology relationship according to the load data includes:

[0059] When the constraint condition is that the table count imbalance is minimized, the table count imbalance is used as indicator data;

[0060] Inputting the load data into a user number balance quantification indicator calculation formula to obtain a meter count imbalance corresponding to the phase topology relationship;

[0061] The calculation formula of the user number balance quantification indicator is:

[0062] ;

[0063] in, Indicates the table count imbalance; Indicates the meter count connected to phase A of the distribution network terminal; Indicates the meter count connected to phase B of the distribution network terminal; Indicates the meter count connected to phase C of the distribution network terminal; represents the mean value of the meter counts connected to the three phases of the distribution network terminal, and k represents the time corresponding to each phase update.

[0064] By adopting the above technical solution, the meter count imbalance is used as indicator data, and the load data is input into the user number balance quantitative indicator calculation formula. This calculation formula calculates the ratio of the maximum value of the meter count difference on phases A, B, and C of the distribution network terminal to the mean of the three-phase meter count, thereby achieving accurate quantification of the degree of imbalance in the meter count distribution.

[0065] In a second aspect, the present application provides a three-phase balanced user phase adjustment system based on multi-objective optimization control, the system comprising:

[0066] A data processing module is used to obtain load data of distribution network terminals and low-voltage side users, and identify the initial phase topology relationship based on the load data;

[0067] a first calculation module, configured to calculate phase allocation results corresponding to different constraints based on the load data and the initial phase topology, wherein the constraints are minimum line loss, minimum load imbalance, minimum current imbalance, minimum voltage imbalance, and minimum meter count imbalance;

[0068] Function construction module, used to construct multi-objective functions of line loss, load imbalance, current imbalance, voltage imbalance and meter count imbalance;

[0069] A second calculation module is used 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;

[0070] A scheme generating module is used to generate a phase adjustment scheme for the distribution network terminal and the low-voltage side user according to the optimal phase allocation result.

[0071] In a third aspect, the present application provides a computer storage medium, which stores a plurality of instructions, and the instructions are suitable for being loaded by a processor and executing any one of the above methods.

[0072] 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.

[0073] In summary, the beneficial effects brought about by the technical solution of this application include:

[0074] 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

[0075] 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;

[0076] 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;

[0077] Figure 3 This is a structural diagram of an electronic device provided in an embodiment of the present application.

[0078] Description of reference numerals: 300, electronic device; 301, processor; 302, communication bus; 303, user interface; 304, network interface; 305, memory. DETAILED DESCRIPTION

[0079] 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.

[0080] In the description of the embodiments of this application, words such as "exemplary," "for example," or "for example" are used to indicate examples, illustrations, or descriptions. Any embodiment or design described as "exemplary," "for example," or "for example" in the embodiments of this application should not be construed as being preferred or advantageous over other embodiments or designs. Rather, the use of words such as "exemplary," "for example," or "for example" is intended to present the relevant concepts in a concrete manner.

[0081] In the description of the embodiments of the present application, the term "multiple" means two or more. For example, multiple systems refer to two or more systems, and multiple screen terminals refer to two or more screen terminals. In addition, the terms "first" and "second" are used for descriptive purposes only and are not to be understood as indicating or implying relative importance or implicitly indicating the indicated technical features. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. The terms "including", "comprising", "having" and their variations all mean "including but not limited to", unless otherwise specifically emphasized.

[0082] See Figure 1 This is a flow chart illustrating a method for phase adjustment of a three-phase balanced user based on multi-objective optimization control, provided in an embodiment of the present application. This method can be implemented using a computer program, a single-chip microcontroller, or run on a three-phase balanced user phase adjustment system based on multi-objective optimization control, which is based on a von Neumann architecture. The computer program can be integrated into an application or run as a standalone tool application. The specific steps of the method for phase adjustment of a three-phase balanced user based on multi-objective optimization control are described in detail below.

[0083] S101: Obtain load data of distribution network terminals and low-voltage side users, and identify initial phase topology relationships based on the load data.

[0084] Load data can be understood as real-time power parameter measurements from users and terminals in the distribution network. This data includes timestamps, three-phase current values, three-phase voltage values, three-phase active power, power factor, and other basic information such as asset numbers and user identifiers. This load data is the fundamental data source for achieving three-phase balance adjustment. By collecting and analyzing this data, the initial phase topology of the distribution network can be identified, and key indicators such as load imbalance, current imbalance, and voltage imbalance can be calculated. This allows the current three-phase load balance of the distribution network to be assessed, providing a basis for developing phase adjustment plans.

[0085] The initial phase topology refers to the original connection relationship between all user meters and the distribution network terminals (Phase A, B, and C) in the distribution network. In this embodiment, this refers to the connection status information between the user meter phases and the terminal meter phases, obtained through the load data preprocessing and phase identification process. This information reflects the connection method (single-phase or three-phase four-wire) used by each user meter in the distribution network to which phase. This initial phase topology is used to characterize the initial state of the distribution network load distribution.

[0086] Specifically, load data is collected in real time through the data acquisition unit at the distribution network terminal. The load data includes basic information such as timestamp, three-phase current value, three-phase voltage value, three-phase active power, power factor, and related asset number and user identification. This load data reflects the power consumption characteristics and load distribution status of each user in the distribution network. The specific identification process first extracts the wiring method information of the user meter based on the asset number, and determines whether each user meter uses single-phase wiring or three-phase four-wire wiring. 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 topology relationship is formed.

[0087] Optionally, the load data is preprocessed before identifying the initial phase topology relationship.

[0088] Since data anomalies may occur during the power data collection process due to equipment failures, data transmission failures, human operational errors, etc., the collected raw data needs to be preprocessed, including unifying the data format, removing redundant data, identifying abnormal data, and filling in missing values. After data preprocessing, the user load data and terminal load data are merged and sorted in chronological order. The phase topology relationship between user meters and terminal meters is identified by analyzing characteristics such as current fluctuation consistency, current correlation, voltage correlation, and high current. Since the current data in the distribution network system is on the secondary side, the current data of users and terminals needs to be uniformly converted 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 topology relationship.

[0089] S102: Calculate phase allocation results corresponding to different constraints based on load data and initial phase topology, where the constraints are minimum line loss, minimum load imbalance, minimum current imbalance, minimum voltage imbalance, and minimum meter count imbalance.

[0090] Line loss refers to the amount of energy lost during power transmission in the distribution network due to factors such as conductor resistance and equipment impedance. Specifically, in the present embodiment, this refers to the additional line loss caused by three-phase load imbalance, primarily comprising the difference between the unbalanced line loss under unbalanced three-phase load conditions and the baseline line loss under balanced three-phase load conditions.

[0091] Among them, load imbalance refers to the degree of imbalance in the three-phase load power distribution of the distribution network, reflecting the deviation state of the load power between the three phases. In the embodiment 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. It is quantitatively evaluated by the load balance quantitative indicator calculation formula, and the calculation result represents the balance of the load power distribution on phases A, B, and C. By calculating and monitoring the load imbalance, the power load distribution on each phase of the distribution network can be intuitively reflected.

[0092] Current imbalance refers to the degree of imbalance in the distribution of the three-phase current in the distribution network, reflecting the deviation between the current of each phase and the three-phase average current. In the embodiments of the present application, this can be understood as the deviation between the current values ​​of phases A, B, and C and the three-phase current average. This is quantitatively evaluated using the current balance quantification indicator calculation formula, and the calculation result can accurately represent the balance of the three-phase current distribution in the distribution network.

[0093] Voltage imbalance refers to the degree of imbalance in the distribution of the three-phase voltage amplitudes in the distribution network, reflecting the deviation between the voltages of each phase and the three-phase average voltage. In the present embodiment, this can be understood as the deviation between the voltage values ​​of phases A, B, and C and the three-phase average voltage. This is quantitatively evaluated using the voltage balance quantification indicator calculation formula, and the calculation result can represent the balance of the three-phase voltage distribution in the distribution network.

[0094] Meter count imbalance refers to the degree of imbalance in the distribution of the number of user meters connected to the three phases of the distribution network, reflecting the differential distribution of the number of users on each phase. In the present embodiment, this can be understood as the degree of deviation between the number of meters connected to phases A, B, and C of the distribution network terminal and the average number of meters on the three phases. This is quantitatively evaluated using the formula for calculating the quantitative indicator of user number balance, and the calculation result can represent the balanced distribution of user meters on the three phases.

[0095] Among them, the phase allocation results corresponding to different constraints refer to the optimal phase connection schemes calculated under the five constraints of minimum line loss, minimum load imbalance, minimum current imbalance, minimum voltage imbalance and minimum meter count imbalance. In the embodiment of the present application, it can be understood that by performing phase update iteration on the initial phase topology relationship, the phase topology relationship that can make the corresponding indicators reach the optimal level is obtained under each constraint condition. These phase topology relationships record the optimal connection status between the user meter and each phase of the distribution network terminal. By calculating the phase allocation results corresponding to different constraints, the optimal solution can be obtained from multiple dimensions such as line loss optimization, load balance, current balance, voltage balance and user number balance. Since there may be conflicts between these constraints, such as the phase allocation scheme that reduces line loss may cause the meter count imbalance to increase, it is necessary to balance the influence of each constraint through multi-objective optimization, and finally select a phase adjustment scheme with the best comprehensive performance.

[0096] In the specific implementation, the phase parameters in the distribution network terminal are first updated and iterated based on the initial phase topology relationship. For the phase topology relationship obtained in each iteration, the load data is used to calculate the index values ​​under five constraint conditions: the line loss index is obtained by calculating the unbalanced line loss under the three-phase load imbalance state, the load imbalance index is obtained by using the load balance quantization index calculation formula, the current imbalance index is obtained by using the current balance quantization index calculation formula, the voltage imbalance index is obtained by applying the voltage balance quantization index calculation formula, and the meter count imbalance index is obtained by using the user number balance quantization index calculation formula. During the iteration process, the phase topology relationship that can make the corresponding index reach the optimal value under each constraint condition is recorded. When the highest phase of the distribution network terminal can no longer be allocated, the iteration process ends.

[0097] This approach yields five different phase allocation results, each representing the optimal solution under specific constraints. These results demonstrate the optimization effect of phase adjustment from different perspectives, including energy efficiency, load distribution, current characteristics, voltage quality, and user distribution.

[0098] Based on the above embodiment, as an optional implementation, step S102 specifically further includes S201-S203.

[0099] S201: updating the initial phase topology relationship based on the connection mode of the target user meter until the highest phase at the distribution network terminal can no longer be allocated;

[0100] In specific implementation, during the phase update process, the wiring method of the target user meter is first identified. For user meters with single-phase meter wiring method, since they have a single high-phase access point, their 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 updated synchronously. For user meters with three-phase four-wire meter wiring method, since there are multiple phase access points, it is necessary to first obtain their 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 continue until the highest phase of the distribution network terminal can no longer be allocated to other user meters.

[0101] Based on the above embodiment, as an optional implementation mode, according to different connection modes of target user meters, step S201 specifically further includes S301-S303.

[0102] S301: Determine the wiring mode of the target user's meter;

[0103] Among them, the target user meter refers to a representative user electricity meter under the current constraint conditions. In the embodiment of the present application, it can be understood as a user meter that can most significantly reflect the characteristics of specific constraint conditions, and is used to guide the direction of phase optimization adjustment.

[0104] In a specific implementation, the wiring method of the target user meter is identified and determined by reading the user meter wiring data in the distribution network terminal. The specific determination can be made based on the wiring parameter information stored in the distribution network terminal and by analyzing the number of phase access points and connection characteristics. There are multiple methods for identifying wiring methods in related technical solutions, which can be used as one feasible method for determining the wiring method of the target user meter in this application, and will not be detailed here.

[0105] Based on the above embodiment, as an optional implementation, the following method can be used to determine the target user meter.

[0106] According to the initial phase topology relationship, the user meter connected to the high phase of the distribution network terminal is determined; the phase parameter difference between the high phase parameter value in the distribution network terminal and the phase parameter average value is calculated, and the user meter closest to the phase parameter difference is determined as the target user meter.

[0107] In specific implementation, all user meters connected to the high-phase of the distribution network terminal are identified based on the initial phase topology. The difference between the high-phase parameter value and the average phase parameter value at the distribution network terminal is calculated and used as the target value. The target user meter is then selected from the user meters on the high-phase whose parameter value is closest to this target value. This selection method ensures that the parameter characteristics of the selected target user meters match the overall imbalance level of the system.

[0108] For example, when the constraint is to minimize line loss or current imbalance, the parameter value is the current value, as line loss is related to current imbalance. The specific implementation steps are to determine all user meters connected to the high phase of the distribution network terminal, find the high phase and low phase current from the currents of phases A, B, and C of the distribution network terminals, calculate the difference between the high phase current and the three-phase current mean, and then find the target user meter that is closest to this difference from all user meters connected to the high phase. Similarly, when the constraint is to minimize load imbalance, the parameter value is active power. When the constraint is to minimize voltage imbalance, the parameter value is voltage.

[0109] Specifically, when the constraint is to minimize meter count imbalance, the meter counts of users connected to each phase of the distribution network terminals A, B, and C are used to identify the meter counts of multiple phases, medium phases, and phases with few meters. The difference between the meter counts and the mean meter counts for each phase is then calculated. Since meter count imbalance is determined based on the overall number of meters, there is no need to filter out the target user meters.

[0110] Correspondingly, the phase update of the user table count is specifically carried out in the following manner:

[0111] When the difference between the multi-phase meter and the mean meter count is greater than 0, the difference between the medium phase meter and the mean meter count is greater than or equal to 0, and the difference between the small phase meter and the mean meter count is less than 0, all single-phase meters are screened out from the multi-phase meter and the medium phase meter. Then, the sum of the difference between the multi-phase meter and the mean meter count plus the difference between the medium phase meter and the mean meter count is calculated and rounded down. Finally, the above number of meters are screened out again from the screened single-phase meters and moved to the small phase meter.

[0112] When the difference between the multi-phase of the meter and the mean of the meter count is greater than 0, and the difference between the medium phase of the meter and the mean of the meter count and the difference between the minority phase of the meter and the mean of the meter count are both less than 0, all single-phase meters are screened out from the multi-phase of the meter. Then, from the above single-phase meters, the meters with the number of differences between the medium phase of the meter and the mean of the meter count are rounded down to the medium phase of the meter, and from the above single-phase meters, the meters with the number of differences between the minority phase of the meter and the mean of the meter count are rounded down to the minority phase.

[0113] S302: If the connection mode of the target user meter is a single-phase meter connection mode, the high phase of the target user meter is updated to the low phase, and the phase parameter values ​​of each phase in the distribution network terminal are updated until the highest phase of the distribution network terminal can no longer be allocated;

[0114] 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. In specific implementation, the single-phase target user meter is updated from high phase to low phase, and the phase parameter value in the distribution network terminal is updated accordingly: the specific parameters corresponding to the original high phase are lowered, and the specific parameters of the newly allocated low phase are increased. This phase update process continues until the highest phase in the distribution network terminal can no longer be allocated. After each phase update, the updated index data is calculated, the corresponding phase allocation scheme is recorded, and finally the optimal phase allocation scheme is determined by comparing the data indicators of all schemes.

[0115] For example, when the constraint is to minimize voltage imbalance, the voltage parameters of the original high-voltage phase are lowered, while those of the newly assigned low-voltage phase are increased. This phase update process continues until the phase with the highest voltage at the customer meter connected to the distribution network terminal can no longer be assigned. After each phase update, the updated voltage imbalance index is calculated, and the corresponding phase allocation plan is recorded. Ultimately, the optimal phase allocation plan is determined by comparing the voltage imbalance index of all plans.

[0116] S303: If the connection method of the target user meter is a three-phase four-wire meter connection method, the high parameter phase and low parameter phase of the target user meter are obtained; if the low parameter phase of the target user meter is not equal to the high phase of the distribution network terminal, the low parameter phase of the target user meter is marked as the high phase of the distribution network terminal, and the phase parameter values ​​of the high phase and the low parameter phase are updated; if the high parameter phase of the target user meter is not equal to the low phase of the distribution network terminal, the high parameter phase of the target user meter is marked as the low phase of the distribution network terminal, and the phase parameter values ​​of the low phase and the high parameter phase are updated until the highest phase of the distribution network terminal can no longer be allocated.

[0117] When the target user meter is a three-phase four-wire meter, it is necessary to obtain the parameters 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. In specific implementation, first determine whether the low parameter phase of the target user meter is equal to the high phase of the distribution network terminal. If 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 the two phases are updated at the same time; secondly, determine whether the high parameter phase of the target user meter is equal to the low phase of the distribution network terminal. If 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 the two phases are updated. This phase update process continues until the highest phase in the distribution network terminal can no longer be allocated. After each phase update, the relevant indicators are calculated and the corresponding phase allocation scheme is recorded.

[0118] S202: 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;

[0119] Among them, the indicator data refers to the evaluation parameters that reflect 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 indicator values ​​required to be calculated according to different constraints. For example, when the constraint condition is to minimize line loss, the indicator data is the line loss corresponding to the phase topology relationship after each phase update. When the constraint condition is to minimize voltage imbalance, the indicator data is the voltage imbalance corresponding to the phase topology relationship after each phase update. The indicator data is used to evaluate the quality of the operating status of the distribution network terminal after each phase adjustment.

[0120] During phase optimization at distribution network terminals, each phase update requires a complete record of the connection relationships between customer meters and each phase of the distribution network terminal, known as the phase topology. This record contains the specific phase information to which each customer meter is currently connected, reflecting the phase distribution of customer meters across the entire distribution network terminal. Based on this recorded phase topology, combined with customer load data (such as power consumption and voltage) in the system, the specific indicators corresponding to this topology are calculated using the calculation methods specified by the constraints (e.g., formulas for three-phase imbalance and voltage imbalance).

[0121] Based on the above embodiment, as an optional implementation, for a case where the constraint condition is to minimize line loss power, steps S401 to S403 may be used to calculate corresponding indicator data.

[0122] Since time-sharing line losses are difficult to estimate and quantify, the calculation is based on the phase-separated equal resistance method. The line loss situation is evaluated by calculating the ratio of the line loss under three-phase load unbalanced state to the line loss under three-phase load balanced state.

[0123] S401: When the constraint condition is to minimize the line loss, calculate the unbalanced line loss corresponding to the phase topology relationship under the three-phase load unbalance state according to the load data;

[0124] During implementation, the distribution of users on each phase is first determined based on the recorded phase topology. The forward active power data is then obtained from the load table at the distribution network terminal. The calculated time-of-day line loss is the difference between the forward active power at the terminal at the current moment and the sum of the 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. This unbalanced line loss includes the additional loss caused by the unbalanced three-phase load and can truly reflect the operating efficiency of the distribution network under the current phase distribution scheme.

[0125] S402: Calculate the loss ratio between the three-phase load unbalanced state and the three-phase load balanced state using a ratio calculation formula;

[0126] 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 in the actual three-phase load unbalanced operating state to the loss in the ideal three-phase load balanced state. In the embodiment of the present application, it can be understood as the ratio of the actual three-phase unbalanced loss and the ideal three-phase balanced loss corresponding to the current phase topology relationship under the same total load conditions, calculated by the phase-splitting equal resistance method.

[0127] To calculate the loss ratio, the following steps can be used.

[0128] 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 of the three-phase load current is determined. 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;

[0129] Input the three-phase load current and phase state into the ratio calculation formula to obtain the loss ratio of the three-phase load unbalanced state to the three-phase load balanced state;

[0130] The ratio calculation formula is:

[0131] , ;

[0132] in, Indicates the loss ratio between the three-phase load unbalanced state and the three-phase load balanced state. Indicates the three-phase load current imbalance, Indicates the maximum single-phase load current among the three-phase load currents. Indicates the average value of three-phase load current.

[0133] To accurately calculate the loss ratio between an unbalanced and balanced three-phase load state, a detailed analysis of the three-phase load current distribution is required. Specifically, the average three-phase load current is calculated. This average represents the current borne by each phase under ideal three-phase load balance. The ratio of the actual current of phases A, B, and C to this average is then calculated. These ratios quantitatively reflect the degree to which each phase's load deviates from the average level. Based on these calculated ratios, the phase state is determined for the current topology.

[0134] Optionally, if the ratio is greater than 1.2, the phase is considered heavy, if the ratio is between 0.8 and 1.2, the phase is considered average, and if the ratio is less than 0.8, the 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 of the three-phase load unbalanced state to the three-phase load balanced state.

[0135] This formula calculates the loss ratio between an unbalanced and balanced three-phase load state. It accurately quantifies the losses under different phase conditions through rigorous mathematical expressions. The loss ratio calculation formula is divided into three cases based on the different three-phase load distribution states.

[0136] At the same time It indicates the maximum value among the three-phase load currents, reflecting the current magnitude of the heaviest loaded phase; Represents the average three-phase load current, representing the current carried by each phase under ideal balance. This calculation method characterizes the degree of imbalance by the relative deviation between the maximum phase current and the average current. When the maximum phase current is closer to the average current, the three-phase load current imbalance is smaller, indicating a closer balance. Conversely, when the difference between the maximum phase current and the average current is larger, the three-phase load current imbalance is larger, indicating a more severe imbalance.

[0137] S403: Calculate the line loss power corresponding to the phase topology relationship based on the unbalanced line loss power and the loss ratio. The line loss power is indicator data corresponding to the constraint condition of minimum line loss power.

[0138] Specifically, first, the three-phase load current at the distribution network terminal is analyzed to obtain the ratio of each phase current to the average value of the three-phase load current. Based on this ratio, the phase state of the three-phase load current is determined, including one phase heavy, one phase light, one phase average, or one phase heavy, two phases light, or two phases heavy, one phase light. The determined three-phase load current and its phase state are substituted into the loss ratio calculation formula to obtain the loss ratio of the three-phase load unbalanced state and the three-phase load balanced state. The loss ratio reflects the degree of additional loss caused by three-phase imbalance in the system. The ideal line loss corresponding to the balanced state can be obtained by dividing the unbalanced line loss by the loss ratio. Then, a new phase topology relationship can be obtained by phase adjustment, and a new ratio is calculated to obtain a new line loss, which is used as the indicator data under the constraint condition of minimum line loss.

[0139] In the above step S202 of calculating the index data, the above-mentioned method for calculating the index data under the constraint condition of minimizing the line loss power is given. The following specifically provides the method for calculating the index data under other constraint conditions.

[0140] Specifically, when the constraint condition is that the load imbalance is minimized, the three-phase load imbalance is used as the indicator data;

[0141] Input the load data into the load balancing quantitative index calculation formula to obtain the three-phase load imbalance corresponding to the phase topology relationship;

[0142] The calculation formula for load balancing quantitative indicators is:

[0143] ;

[0144] in,

[0145] Indicates the three-phase load imbalance,

[0146] represents the active power of phase A at time k,

[0147] represents the active power of phase B at time k;

[0148] represents the active power of phase C at time k;

[0149] It represents the mean value of the three-phase active power at time k, where k represents the time corresponding to each phase update.

[0150] Specifically, the formula first calculates the absolute value of the active power difference between two adjacent phases 、 and These three differences reflect the load power deviations between phases A and B, B and C, and A and C, respectively. Taking the maximum of these three differences reveals the most severe inter-phase power imbalance in the system. This maximum difference directly reflects the maximum deviation in the system load distribution.

[0151] In order 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. Normalization is performed. This processing method eliminates the influence of absolute power size, so that the load imbalance after different phase updates can be compared horizontally. Finally, multiply the result by 100% to convert it into percentage form, making the evaluation result more intuitive. The smaller the value, the more balanced the three-phase load distribution; on the contrary, the larger the value, the more balanced the three-phase load distribution. A value of 0 indicates that there is a significant load imbalance in the system.

[0152] Specifically, when the constraint condition is that the current imbalance is minimized, the three-phase current imbalance is used as the indicator data;

[0153] Input the load data into the current balance quantitative index calculation formula to obtain the three-phase current imbalance corresponding to the phase topology relationship;

[0154] The calculation formula for the current balancing quantitative index is:

[0155] ;

[0156] in, Indicates the three-phase current imbalance, 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 mean value of the three-phase current at time k, where k represents the time corresponding to each phase update.

[0157] Specifically, the degree of imbalance is quantified by analyzing the current deviation between the three phases. 、 and The current difference between any two phases is calculated separately, and the most significant current deviation in the system can be captured by taking the maximum value. Then the normalization method is used to divide the maximum current difference by the average value of the three-phase current. This approach makes the evaluation results under different operating conditions comparable. The final result, expressed as a percentage, intuitively reflects the degree of current imbalance in the system.

[0158] Specifically, when the constraint condition is to minimize the voltage imbalance, the three-phase voltage imbalance is used as the indicator data;

[0159] Input the load data into the voltage balance quantitative index calculation formula to obtain the three-phase voltage imbalance corresponding to the phase topology relationship;

[0160] The calculation formula for voltage balancing quantitative indicators is:

[0161] ;

[0162] in, Indicates the three-phase voltage imbalance, 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 mean three-phase voltage at time k, where k represents the time corresponding to each phase update.

[0163] In the calculation formula for the quantitative indicator of voltage balance, since the impact of user phase adjustment on terminal voltage is difficult to estimate, we convert the goal of terminal voltage balance into the voltage balance of each phase of the user's corresponding terminal phase, that is, calculate the voltage imbalance of the three phases A, B, and C of the user's meter corresponding to the terminal. Based on the phase identification results of the user's meter and the user's voltage data, all meters and voltages connected to the terminal phases A, B, and C are obtained, and the average voltage of each phase is calculated. 、 、 .

[0164] By calculating the absolute value of the voltage difference between each phase, and then taking the maximum value from the absolute values ​​of these phase voltage differences, this directly reflects the most significant voltage imbalance in the system. Then divide the maximum voltage difference by the average value of the three-phase voltage Normalization processing is performed so that the index data can be directly compared after each phase update, which facilitates the subsequent determination of the optimal phase solution with the minimum three-phase voltage imbalance.

[0165] Specifically, when the constraint condition is that the table count imbalance is minimized, the table count imbalance is used as the indicator data;

[0166] Input the load data into the user number balance quantitative index calculation formula to obtain the meter count imbalance corresponding to the phase topology relationship;

[0167] The calculation formula for the quantitative indicator of user number balance is:

[0168] ；

[0169] in, Indicates the imbalance of table count; Indicates the meter count connected to phase A of the distribution network terminal; Indicates the meter count connected to phase B of the distribution network terminal; Indicates the meter count connected to phase C of the distribution network terminal; It represents the mean value of the meter counts connected to the three phases of the distribution network terminal, and k represents the time after each phase update.

[0170] In the calculation formula of the quantitative indicator of user number balance, by calculating 、 and The absolute values ​​of these three sets of differences reflect the difference in the number of meters between phase A and phase B, phase B and phase C, and phase A and phase C, respectively. The max function is used to select the maximum value of these three differences in order to identify the most unbalanced distribution of meters in the three phases. This maximum difference directly reflects the most serious imbalance in user distribution in the system. represents the mean value of meter counts on the three phases of the distribution network terminal, that is, ( + + ) / 3 The maximum difference is divided by the average value for normalization, allowing for horizontal comparison of the imbalance between distribution network terminals with different user sizes. Finally, the result is converted to a percentage by multiplying it by 100%, making the evaluation more intuitive.

[0171] By analyzing the difference in meter counts of each phase, the imbalance degree of user distribution can be accurately quantified. The smaller the value, the more balanced the user distribution; otherwise, it indicates that there is a significant imbalance in user distribution in the system.

[0172] S203: Determine the phase topology relationship corresponding to the optimal solution of the indicator data as the phase allocation result corresponding to the current constraint condition.

[0173] After recording the phase topology relationships and calculating the index data after each phase update, the optimal phase allocation result needs to be selected from these phase topology relationships. Since the optimization objectives under different constraints are different, it is necessary to select the corresponding optimal solution for each constraint. Specifically, when the constraint condition is to minimize line loss, by comparing the line loss values ​​corresponding to all phase topology relationships, the phase topology relationship with the minimum line loss is selected as the phase allocation result under the constraint condition; when the constraint condition is to minimize load imbalance, by comparing the three-phase load imbalance values ​​corresponding to all phase topology relationships, the phase topology relationship with the minimum three-phase load imbalance is selected as the phase allocation result under the constraint condition; when the constraint condition is to minimize current imbalance, by comparing the three-phase current imbalance values ​​corresponding to all phase topology relationships, the phase topology relationship with the minimum three-phase current imbalance is selected as the phase allocation result under the constraint condition; when the constraint condition is to minimize voltage imbalance, by comparing the three-phase voltage imbalance values ​​corresponding to all phase topology relationships, the phase topology relationship with the minimum three-phase voltage imbalance is selected as the phase allocation result under the constraint condition; when the constraint condition is to minimize meter count imbalance, by comparing the meter count imbalance values ​​corresponding to all phase topology relationships, the phase topology relationship with the minimum meter count imbalance is selected as the phase allocation result under the constraint condition.

[0174] S103: Constructing a multi-objective function of line loss, load imbalance, current imbalance, voltage imbalance, and meter count imbalance.

[0175] In order to ensure that the technical solution provided by this application can be implemented, this application provides a multi-objective function.

[0176]

[0177]

[0178] in, 、 、 、 、 They represent line loss, load imbalance, current imbalance, voltage imbalance, and meter count imbalance respectively. 、 、 、 、 They represent the weight coefficients of line loss, load imbalance, current imbalance, voltage imbalance, and meter count imbalance respectively.

[0179] Considering the practical engineering limits for each indicator, constraints are imposed on current and voltage imbalance, limiting them to 10% and 5%, respectively. All indicators are required to be non-negative. The optimization goal of the multi-objective function is to minimize the sum of the weighted indicators. Specifically, the phase allocation solution is sought that minimizes the objective function while satisfying the constraints.

[0180] S104: Calculate the multi-objective function values ​​corresponding to the respective 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.

[0181] In specific implementation, the optimal phase connection schemes are first obtained under the five constraints of minimizing line loss, minimizing load imbalance, minimizing current imbalance, minimizing voltage imbalance, and minimizing meter count imbalance. These schemes are obtained by performing phase update iterative calculations on the initial phase topology, detailing the connection status between the user meter and each phase of the distribution network terminal. The performance indicators corresponding to these five phase connection schemes are then substituted into the constructed multi-objective function for calculation. By calculating and comparing the multi-objective function values ​​corresponding to these five schemes, the phase allocation scheme with the minimum multi-objective function value is selected as the final optimal phase allocation result.

[0182] S105: Generate a phase adjustment plan for the distribution network terminal and the low-voltage side user according to the optimal phase allocation result.

[0183] This optimal phase allocation result is obtained through a multi-objective function evaluation of the phase allocation scheme under the five constraints of minimizing line loss, minimizing load imbalance, minimizing current imbalance, minimizing voltage imbalance, and minimizing meter count imbalance. It records the optimal connection relationship between 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 require phase adjustment. Subsequently, based on the comparison results, a detailed phase adjustment execution plan is formulated to clarify the target phase to which each user meter that needs adjustment should be switched from its current connection phase.

[0184] The following are system embodiments of the present application, which can be used to implement the method embodiments of the present application. For details not disclosed in the system embodiments of the present application, please refer to the method embodiments of the present application.

[0185] See Figure 2, which shows a schematic diagram of the structure 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 a system through software, hardware, or a combination of both. The three-phase balanced user phase adjustment system based on multi-objective optimization control includes:

[0186] The data processing module is used to obtain the load data of the distribution network terminal and the low-voltage side users, and identify the initial phase topology relationship based on the load data;

[0187] A first calculation module is used to calculate phase allocation results corresponding to different constraints based on load data and initial phase topology, where the constraints are minimum line loss, minimum load imbalance, minimum current imbalance, minimum voltage imbalance, and minimum meter count imbalance;

[0188] Function construction module, used to construct multi-objective functions of line loss, load imbalance, current imbalance, voltage imbalance and meter count imbalance;

[0189] The second calculation module is used to 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;

[0190] The scheme generation module is used to generate a phase adjustment scheme for the distribution network terminal and the low-voltage side user according to the optimal phase allocation result.

[0191] Based on the above embodiment, as an optional embodiment, the first calculation module is also used to update the initial phase topology relationship based on the wiring method of the target user meter until the highest phase of the distribution network terminal can no longer be allocated; record the phase topology relationship after each phase update, and calculate the index data corresponding to the phase topology relationship based on 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 condition.

[0192] On the basis of the above embodiments, as an optional embodiment, the first calculation module is also used to calculate the unbalanced line loss corresponding to the phase topology relationship under the three-phase load unbalanced state according to the load data when the constraint condition is the minimum line loss; use the ratio calculation formula to calculate the loss ratio of the three-phase load unbalanced state and the three-phase load balanced state; calculate the line loss corresponding to the phase topology relationship according to the unbalanced line loss and the loss ratio, and the line loss is the indicator data corresponding to the constraint condition of minimum line loss.

[0193] Based on the above embodiment, as an optional embodiment, the first calculation module is further used to determine the phase state of the three-phase load current based on 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, one phase heavy, two phases light, or two phases heavy, one phase light; the three-phase load current and the phase state are input into the ratio calculation formula to obtain the loss ratio of the three-phase load unbalanced state to the three-phase load balanced state; wherein the ratio calculation formula is:

[0194] ， ;

[0195] in, Indicates the loss ratio between the three-phase load unbalanced state and the three-phase load balanced state. Indicates the three-phase load current imbalance, Indicates the maximum single-phase load current among the three-phase load currents. Indicates the average value of three-phase load current.

[0196] On the basis of the above embodiment, as an optional embodiment, the first calculation module is further used 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, the high phase of the target user meter is updated to a low phase, and the phase parameter values ​​of each phase in the distribution network terminal are updated until the highest phase of the distribution network terminal can no longer be allocated; if the wiring mode of the target user meter is a three-phase four-wire meter wiring mode, the high parameter phase and low parameter phase of the target user meter are obtained; if the low parameter phase of the target user meter is not equal to the high phase of the distribution network terminal, the low parameter phase of the target user meter is marked as the high phase of the distribution network terminal, and the phase parameter values ​​of the high phase and the low parameter phase are updated; if the high parameter phase of the target user meter is not equal to the low phase of the distribution network terminal, the high parameter phase of the target user meter is marked as the low phase of the distribution network terminal, and the phase parameter values ​​of the low phase and the high parameter phase are updated until the highest phase of the distribution network terminal can no longer be allocated.

[0197] Based on the above embodiment, as an optional embodiment, the first calculation module is also used to determine the user meter connected to the high phase of the distribution network terminal based on the initial phase topology relationship; calculate the phase parameter difference between the high phase parameter value in the distribution network terminal and the phase parameter average value, and determine the user meter closest to the phase parameter difference as the target user meter.

[0198] Based on the above embodiment, as an optional embodiment, the first calculation module is further configured to use the three-phase load imbalance as indicator data when the constraint condition is that the load imbalance is minimized; input the load data into a load balancing quantitative indicator calculation formula to obtain the three-phase load imbalance corresponding to the phase topology relationship; the load balancing quantitative indicator calculation formula is:

[0199] ;

[0200] in, Indicates the three-phase load imbalance, 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; It represents the mean value of the three-phase active power at time k, where k represents the time after each phase update.

[0201] Based on the above embodiment, as an optional embodiment, the first calculation module is further configured to use the three-phase current imbalance as indicator data when the constraint condition is that the current imbalance is minimized; input the load data into the current balance quantitative indicator calculation formula to obtain the three-phase current imbalance corresponding to the phase topology relationship; the current balance quantitative indicator calculation formula is:

[0202] ;

[0203] in, Indicates the three-phase current imbalance, 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 mean value of the three-phase current at time k, where k represents the time after each phase update.

[0204] Based on the above embodiment, as an optional embodiment, the first calculation module is further configured to use the three-phase voltage imbalance as indicator data when the constraint condition is to minimize the voltage imbalance; input the load data into the voltage balance quantitative indicator calculation formula to obtain the three-phase voltage imbalance corresponding to the phase topology relationship; the voltage balance quantitative indicator calculation formula is:

[0205] ;

[0206] in, Indicates the three-phase voltage imbalance, 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 mean three-phase voltage at time k, where k represents the time after each phase update.

[0207] Based on the above embodiment, as an optional embodiment, the first calculation module is further configured to use the meter count imbalance as indicator data when the constraint condition is to minimize the meter count imbalance; input the load data into a user number balance quantitative indicator calculation formula to obtain the meter count imbalance corresponding to the phase topology relationship; the user number balance quantitative indicator calculation formula is:

[0208] ;

[0209] in, Indicates the imbalance of table count; Indicates the meter count connected to phase A of the distribution network terminal; Indicates the meter count connected to phase B of the distribution network terminal; Indicates the meter count connected to phase C of the distribution network terminal; It represents the mean value of the meter counts connected to the three phases of the distribution network terminal, and k represents the time after each phase update.

[0210] An embodiment of the present application also provides a computer storage medium, which can store multiple instructions. The instructions are suitable for being loaded and executed by a processor, such as the three-phase balanced user phase adjustment method based on multi-objective optimization control in the above-mentioned embodiment. The specific execution process can be found in the specific description of the embodiment, which will not be repeated here.

[0211] See Figure 3 , is a schematic diagram of the structure of an electronic device provided in an embodiment of the present application. Figure 3 As 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 .

[0212] The communication bus 302 is used to implement the connection and communication between these components.

[0213] The user interface 303 may include a standard wired interface or a wireless interface.

[0214] The network interface 304 may optionally include a standard wired interface or a wireless interface (such as a WI-FI interface).

[0215] The processor 301 may include one or more processing cores. Using various interfaces and circuits, the processor 301 connects to various components within the server. It executes instructions, programs, code sets, or instruction sets stored in the memory 305, as well as accesses data stored in the memory 305, to perform various server functions and process data. Optionally, the processor 301 may be implemented using at least one of the following hardware forms: a digital signal processing (DSP), a field-programmable gate array (FPGA), or a programmable logic array (PLA). The processor 301 may integrate one or a combination of a central processing unit (CPU), a graphics processing unit (GPU), and a modem. The CPU primarily processes the operating system, user interface, and application programs; the GPU is responsible for rendering and drawing content displayed on the display screen; and the modem handles wireless communications. It is understood that the modem may not be integrated into the processor 301 but implemented as a separate chip.

[0216] Among them, the memory 305 may include a random access memory (RAM) or a read-only memory (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, wherein the program storage area may store instructions for implementing an operating system, instructions for at least one function (such as a touch function, a sound playback function, an image playback function, etc.), instructions for implementing the above-mentioned various method embodiments, etc.; the data storage area may store data involved in the above-mentioned various method embodiments, etc. The memory 305 may also be optionally at least one storage device located away from the aforementioned processor 301. As Figure 3 As shown, the memory 305 as a computer storage medium may include 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.

[0217] exist Figure 3In the electronic device 300 shown, the user interface 303 is mainly used to provide an input interface for the user and obtain data input by the user; and the processor 301 can be used to call an application program stored in the memory 305 for a three-phase balanced user phase adjustment method based on multi-objective optimization control. When executed by one or more processors, the electronic device executes one or more methods in the above-mentioned embodiments.

[0218] An electronic device readable storage medium stores instructions, which, when executed by one or more processors, enable the electronic device to execute one or more methods in the above embodiments.

[0219] It should be noted that for the aforementioned method embodiments, for simplicity of description, they are all expressed as a series of action combinations, but those skilled in the art should be aware that this application is not limited by the order of the actions described, because according to this application, certain steps can be performed in other orders or simultaneously. Secondly, those skilled in the art should also be aware that the embodiments described in the specification are all preferred embodiments, and the actions and modules involved are not necessarily required for this application.

[0220] In the above embodiments, the description of each embodiment has its own focus. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0221] In the several embodiments provided in this application, it should be understood that the disclosed devices can be implemented in other ways. For example, the device embodiments described above are merely schematic, such as the division of units, which is only a logical function division. In actual implementation, there may be other division methods, such as 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 mutual coupling or direct coupling or communication connection shown or discussed can be through some service interface, and the indirect coupling or communication connection of devices or units can be electrical or other forms.

[0222] Units described as separate components may or may not be physically separate, and components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of these units may be selected to achieve the purpose of this embodiment according to actual needs.

[0223] In addition, the functional units in the various embodiments of the present application may be integrated into a single processing unit, or each unit may exist physically separately, or two or more units may be integrated into a single unit. The aforementioned integrated units may be implemented in the form of hardware or software functional units.

[0224] If the integrated unit is implemented as 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 this application, or the portion that contributes to the prior art, or all or part of the 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, server, or network device, etc.) to execute all or part of the steps of the various embodiments of the method of this application. The aforementioned memory includes various media that can store program code, such as USB flash drives, mobile hard drives, magnetic disks, or optical disks.

[0225] The above are merely exemplary embodiments of the present disclosure and are not intended to limit the scope of the present disclosure. That is, any equivalent changes and modifications made in accordance with the teachings of the present disclosure are still within the scope of the present disclosure. After considering the disclosure of the specification and the truth of practice, those skilled in the art will easily think of other embodiments of the present disclosure. This application is intended to cover any variations, uses or adaptive changes of the present disclosure, which follow the general principles of the present disclosure and include common knowledge or customary technical means in the field of the present disclosure that are 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 comprises: Obtaining load data of distribution network terminals and low-voltage side users, and identifying an initial phase topology relationship based on the load data; Calculating phase allocation results corresponding to different constraints based on the load data and the initial phase topology, wherein the constraints are minimum line loss, minimum load imbalance, minimum current imbalance, minimum voltage imbalance, and minimum meter count imbalance; The phase allocation results corresponding to different constraint conditions are calculated respectively according to the load data and the initial phase topology relationship, including: updating the phase of the initial phase topology relationship 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 according to the load data; and 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; The phase topology relationship of the initial phase 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, including: judging the connection mode of the target user meter; if the connection mode of the target user meter is a single-phase meter connection mode, updating the high phase of the target user meter to a low phase, and updating the phase parameter value of each phase in the distribution network terminal until the highest phase of the distribution network terminal can no longer be allocated; if the connection mode of the target user meter is a three-phase four-wire meter connection mode, obtaining the high parameter value of the target user meter; digital phase and low parameter phase; if the low parameter phase of the target user meter is not equal to the high phase of the distribution network terminal, the low parameter phase of the target user meter is marked as the high phase of the distribution network terminal, and the phase parameter values ​​of the high phase and the low parameter phase are updated; if the high parameter phase of the target user meter is not equal to the low phase of the distribution network terminal, the high parameter phase of the target user meter is marked as the low phase of the distribution network terminal, and the phase parameter values ​​of the low phase and the high parameter phase are updated until the highest phase of the distribution network terminal can no longer be allocated; Construct a multi-objective function for line loss, load imbalance, current imbalance, voltage imbalance, and meter count imbalance; Calculating the multi-objective function values ​​corresponding to 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; A phase adjustment plan for the distribution network terminal and the low-voltage side user is generated according to the optimal phase allocation result.

2. The method according to claim 1, characterized in that The recording of the phase topology relationship after each phase update and calculating the index data corresponding to the phase topology relationship according to the load data include: 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; The line loss amount corresponding to the phase topology relationship is calculated according to the unbalanced line loss amount and the loss ratio, where the line loss amount is indicator data corresponding to the constraint condition for minimizing the line loss amount.

3. The method according to claim 2, characterized in that The ratio calculation formula is used to calculate the loss ratio between the three-phase load unbalanced state and the three-phase load balanced state, including: Determining a phase state of the three-phase load current according to a ratio of each phase current in the three-phase load current to an average value of the three-phase load current, wherein the phase state includes one phase being heavy, one phase being light, one phase being average, one phase being heavy, two phases being light, or two phases being heavy, one phase being light; Inputting the three-phase current imbalance and the phase state into a ratio calculation formula to obtain a loss ratio between the three-phase load imbalance state and the three-phase load balance state; Wherein, the ratio calculation formula is: ， ； in, Indicates the loss ratio between the three-phase load unbalanced state and the three-phase load balanced state. Indicates the unbalance degree of three-phase load current. Indicates the maximum single-phase load current among the three-phase load currents, Represents the average value of the three-phase load current.

4. The method according to claim 1, wherein Before determining the connection mode of the user meter, the method further includes: Determining a user meter connected to a high phase of the distribution network terminal according to the initial phase topology relationship; A phase parameter difference between a high phase parameter value and a phase parameter average value in the distribution network terminal is calculated, and the user meter closest to the phase parameter difference is determined as the target user meter.

5. The method according to claim 1, wherein The calculating the index data corresponding to the phase topology relationship according to the load data includes: When the constraint condition is that the load imbalance is minimum, the three-phase load imbalance is used as the indicator data; Inputting the load data into a load balancing quantitative index calculation formula to obtain a three-phase load imbalance corresponding to the phase topology relationship; The calculation formula for the load balancing quantification index is: ； in, Indicates the three-phase load imbalance, 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; It represents the mean value of the three-phase active power at time k, where k represents the time corresponding to each phase update.

6. The method according to claim 1, characterized in that The calculating the index data corresponding to the phase topology relationship according to the load data includes: When the constraint condition is that the current unbalance is minimum, the three-phase current unbalance is used as the indicator data; Inputting the load data into a current balance quantification index calculation formula to obtain a three-phase current imbalance corresponding to the phase topology relationship; The current balancing quantitative index calculation formula is: ； in, Indicates the three-phase current imbalance, 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; It represents the mean value of the three-phase current at time k, where k represents the time corresponding to each phase update.

7. The method according to claim 1, characterized in that The calculating the index data corresponding to the phase topology relationship according to the load data includes: When the constraint condition is that the voltage imbalance is minimum, the three-phase voltage imbalance is used as the indicator data; Inputting the load data into a voltage balance quantification indicator calculation formula to obtain a three-phase voltage imbalance corresponding to the phase topology relationship; The voltage balancing quantitative index calculation formula is: ； in, Indicates the three-phase voltage unbalance, 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 mean three-phase voltage at time k, where k represents the time corresponding to each phase update.

8. The method according to claim 1, characterized in that The calculating the index data corresponding to the phase topology relationship according to the load data includes: When the constraint condition is that the table count imbalance is minimum, the table count imbalance is used as indicator data; Inputting the load data into a user number balance quantification indicator calculation formula to obtain a meter count imbalance corresponding to the phase topology relationship; The calculation formula of the user number balance quantification indicator is: ； in, Indicates the table count imbalance; Indicates the meter count connected to phase A of the distribution network terminal; Indicates the meter count connected to phase B of the distribution network terminal; Indicates the meter count connected to phase C of the distribution network terminal; represents the mean value of the meter counts connected to the three phases of the distribution network terminal, and k represents the time corresponding to each phase update.

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