Feeder load transfer method and system considering source-load composition and grid structure diversification

Abstract

The invention discloses a feeder load transfer method and system considering source-load composition and grid structure diversification. The method comprises the steps of collecting grid information and historical data of a medium-voltage power distribution network; performing abnormity judgment and correction processing on the historical data; establishing a novel power distribution network transfer rate model; calculating the transfer rate of a feeder line based on the novel power distribution network transfer rate model and the corrected historical data, and evaluating the transfer capacity of the feeder line; and formulating a feeder load transfer strategy based on the transfer rate and the transfer capability evaluation result. According to the invention, the operation efficiency of the power distribution network is improved, the ability of the power grid to deal with emergencies is effectively improved, and the continuity and reliability of power supply are guaranteed.

Description

Technical Field

[0001] The present invention relates to the field of medium-voltage distribution network feeder load transfer strategies, and in particular to a feeder load transfer method and system that considers source-load composition and grid structure diversity. Background Art

[0002] With rapid socioeconomic development and accelerating urbanization, electricity demand continues to grow, placing increasing pressure on distribution networks. As a crucial link between the transmission grid and users, the operational stability and reliability of the 10kV medium-voltage distribution network are directly linked to the quality of power supply. However, traditional distribution network management strategies have limitations in addressing source-load fluctuations, diverse grid structures, and emergencies.

[0003] Existing feeder load transfer strategies are often based on fixed grid structures and assumed load characteristics, lacking in-depth analysis and utilization of actual operating data. Existing methods for evaluating the transferability of distribution networks often rely on empirical formulas or simple statistical analysis, failing to fully account for variations in source-load composition and the diversity of grid structures. This can lead to significant deviations from actual conditions in the evaluation results. Therefore, developing efficient and flexible feeder load transfer strategies based on real-time data and the actual operating status of distribution networks has become a pressing issue in distribution network management.

[0004] Chinese invention patent application number 201210562252.4 discloses an "online selection system for load transfer paths for 10kV feeders." The selection system is connected to a SCADA system and includes a data interface module, a database module, a graphical display module, and a topology analysis module. The database module is connected to the data interface module, the graphical display module, and the topology analysis module, respectively. The data interface module obtains the equipment parameters and topological connection data, substation main wiring diagram, and real-time measurement data required for transfer path selection from the SCADA system and stores them in the database module. The topology analysis module selects the load transfer path for each 10kV feeder based on the equipment parameters, topological connection data, and real-time measurement data, and saves the selection results to the database module. The graphical display module visualizes the substation main wiring diagram and selection results in the database module. This technical solution's distribution network transferability assessment fails to fully consider the variations in source-load composition and the diversity of grid structures. Summary of the Invention

[0005] To solve the technical problems existing in the background technology, the present invention provides a feeder load transfer method and system that takes into account the source-load composition and the diversity of grid structures. The technical solution adopted by the present invention is: A first aspect of the present invention provides a feeder load transfer method that takes into account source-load composition and grid structure diversity, the method comprising: Collect grid information and historical data of medium voltage distribution network; Performing abnormality judgment and correction processing on the historical data; Establish a new distribution network transfer rate model; Calculate the transferability of feeders based on the new distribution network transferability model and the revised historical data, and evaluate their transferability; A feeder load transfer strategy is formulated based on the transferability rate and transfer capacity evaluation results.

[0006] As a preferred solution, the grid information includes feeder i Grid structure, rated current carrying capacity ; The historical data includes multiple feeders within a single day i No. t The moment a Load current , No. b Distributed photovoltaic output current , No. c Output current of other distributed power sources Feeder i Get the maximum daily current correspond t Always contact feeder B Current data of the tie switch K L , the sequence information of the segment switches.

[0007] As a preferred solution, the method for determining abnormalities and correcting the historical data includes: The data is judged and corrected for abnormalities. The double mean method is used to determine whether there is abnormal data. An abnormal current data correction function is constructed based on the least squares method. The abnormal current data correction value is calculated and the abnormal value is replaced.

[0008] As a preferred solution, the method for determining and correcting abnormal data by using the double mean method to determine whether abnormal data exists, constructing an abnormal current data correction function based on the least squares method, calculating the abnormal current data correction value, and replacing the abnormal value includes: Calculate feeder i common W Japanese t Average current at all times , as shown below:

[0009] Calculate feeder i of t Standard current difference at all times , as shown below:

[0010] Determine feeder i Is there any current data outside this range? If so, mark it as abnormal data and record the date number of the abnormal data. j , based on the least squares method, the abnormal current data correction function is constructed as shown below:

[0011] The parameters of the correction function are calculated and determined by the normal data after removing the abnormal data, as shown in the following formula:

[0012] in, for t The number of normal dates for time data, j is the number of a normal date; Number the date of the abnormal data j Substitute the correction function to calculate the current correction value and replace the original abnormal data.

[0013] As a preferred solution, the method for establishing a new distribution network transfer rate model includes: Defines the average rated load factor of the line K , as shown below:

[0014] Calculation considering grid structure" N -1" fault feeder i Normal operating current limit , as shown below:

[0015] Calculate feeder i Maximum daily current and daily maximum load factor , the calculation process is as follows:

[0016]

[0017]

[0018] in, For feeder i exist t Line current value at the moment; For feeder i exist t Moment a User load current; For feeder i exist t Moment b Distributed photovoltaic output current; For feeder i exist t Moment c Output current of other distributed power sources; is the total number of user loads; is the total number of distributed photovoltaics; is the total number of other distributed power sources; Define feeder i The feeder capacity that is not utilized under the current operating status is called feeder i Capacity margin , which is calculated as follows:

[0019] Define feeder i The ratio of the load margin to the rated current carrying capacity of the feeder is called the transfer rate. , which is calculated as follows: .

[0020] As a preferred solution, a method for calculating the transferability of feeders based on the novel distribution network transferability model and the corrected historical data and evaluating their transferability includes: Calculate the feeder i Load current at each moment , average load capacity limit , determine the feeder i Maximum current moment t And the corresponding daily maximum current value , daily maximum load rate , set the transfer warning limit ; Determine the maximum daily load factor Is it greater than the overload limit? : If so, the feeder is judged to be overloaded; If not, further determine whether to overload; Determine the maximum daily load factor Is it greater than the overload limit? : If so, the feeder is judged to be overloaded; If not, further determine whether to overload; Determine the maximum daily load factor Is it greater than the average rated load rate of the line? : If so, it is determined that the feeder has no power transfer capability; If not, calculate the capacity margin and transfer rate ; Determine the maximum daily load factor Is it greater than the transfer warning limit? : If so, it is determined that the feeder's power transfer capacity is small and a power transfer warning is issued; If not, it is judged that the feeder has good transfer load bearing capacity.

[0021] As a preferred solution, a method for formulating a feeder load transfer strategy based on the transferability rate and transfer capacity evaluation results includes: 1) Confirm the feeder i Interconnection feeder B Sequence of segment switches , the first section switch close to the tie switch is , close to the feeder B The first section switch of the first section of the line is ; 2) Calculate feeder B Partition x The total current is shown in the following formula:

[0022] in, For feeder B Partition x correspond t The moment a User load current; For feeder B Partition x correspond t The moment b PV output current; For feeder B Partition x correspond t The moment c Output current of other distributed power sources; For feeder B Partition x Total number of user loads; For feeder B Partition x Total number of distributed photovoltaics, For feeder B Partition x Total number of other distributed power sources; 3) From the feeder B The first zone near the tie switch n To begin, calculate the feeder BPartition n To partition nm ( m =0,1,…, n -1) load is transferred to the feeder i The feeder occupancy rate after φ is calculated as follows:

[0023] 4) Comparison of feeder occupancy rates With feeder i The transfer rate : like ,make m+ 1, repeat step 3); like , then go to step 5); 5) Determine the load transfer strategy for the feeder: like m =0, on the feeder i No contact feeder B The diversion capability is insufficient, so no diversion is carried out; like m ≠0, then the feeder i Equipped with B partition for interconnecting feeder n-m+ 1 to partition n The ability to transfer the load, the tie switch K L Closed, section switch K Fn to K Fn-m+1 closure, K Fn-m Disconnect, then the contact feeder B Partition n To partition n-m+ 1 load is transferred to the feeder i .

[0024] A second aspect of the present invention provides a feeder load transfer system that takes into account the diversity of source-load composition and grid structure, the system comprising: Data acquisition module, used to collect grid information and historical data of the medium voltage distribution network; A data correction module is used to perform abnormality judgment and correction processing on the historical data; Model building module, used to establish a new distribution network transfer rate model; A transfer capacity evaluation module, configured to calculate the transfer rate of a feeder based on the novel distribution network transfer rate model and the corrected historical data, and evaluate its transfer capacity; The transfer decision module is used to formulate a feeder load transfer strategy based on the transfer rate and transfer capacity evaluation results.

[0025] A third aspect of the present invention provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the steps of the aforementioned feeder load transfer method that takes into account source-load composition and grid structure diversity.

[0026] A fourth aspect of the present invention provides a computer device comprising a storage medium, a processor, and a computer program stored in the storage medium and executable by the processor. When the computer program is executed by the processor, the steps of the aforementioned feeder load transfer method that takes into account the source-load composition and grid structure diversity are implemented.

[0027] Compared with the prior art, the present invention has the following beneficial effects: The present invention adopts the double mean method to detect current anomalies and constructs a time series correction function based on the least squares method. It uses normal data to fit parameters and replace outliers, eliminates data noise interference caused by fluctuations in distributed power output, improves the reliability of key data such as load current and photovoltaic output, and provides accurate input for power transfer decisions.

[0028] The present invention solves the defect of traditional power transfer strategy that ignores grid structure differences by establishing a grid structure adaptive power transfer rate model.

[0029] The present invention avoids overload risks and maximizes the utilization of feeder residual capacity through hierarchical early warning and dynamic iterative power transfer technology.

[0030] The present invention optimizes the grid structure utilization rate through a source-load coordinated partitioned load transfer strategy. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 A flow chart of a feeder load transfer method provided in this embodiment that takes into account source-load composition and grid structure diversity; Figure 2 A flowchart of the abnormality determination and correction process provided in this embodiment; Figure 3 A flowchart for calculating the feeder transfer rate and evaluating its transfer capacity provided in this embodiment; Figure 4 A flowchart of formulating a feeder load transfer strategy based on the transferability rate provided in this embodiment; Figure 5 A schematic diagram of the line communication mode provided in this embodiment; Figure 6 A schematic diagram of the actual application of the line contact mode provided in this embodiment; Figure 7A feeder load current curve diagram before correction provided in this embodiment; Figure 8 This is a modified feeder load current curve diagram provided in this embodiment. DETAILED DESCRIPTION The accompanying drawings are for illustrative purposes only and are not to be construed as limiting the present invention; It should be clear that the embodiments described are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments of the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the embodiments of the present application.

[0032] The terms used in the embodiments of the present application are for the purpose of describing specific embodiments only and are not intended to limit the embodiments of the present application. The singular forms "a," "the," and "the" used in the embodiments of the present application and the appended claims are also intended to include plural forms unless the context clearly indicates otherwise. It should also be understood that the term "and / or" used herein refers to and includes any or all possible combinations of one or more associated listed items.

[0033] When the following description refers to the accompanying drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. On the contrary, they are merely examples of devices and methods consistent with some aspects of the present application as detailed in the appended claims. In the description of the present application, it should be understood that the terms "first", "second", "third", etc. are only used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence, nor can they be understood as indicating or implying relative importance. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances.

[0034] In addition, in the description of this application, unless otherwise specified, "plurality" refers to two or more. "And / or" describes the relationship between associated objects, indicating that three relationships can exist. For example, "A and / or B" can mean: A exists alone, A and B exist simultaneously, and B exists alone. The character " / " generally indicates that the associated objects are in an "or" relationship. The present invention is further described below with reference to the accompanying drawings and examples.

[0035] The present invention is further described below with reference to the accompanying drawings and embodiments.

[0036] Example 1 Please refer to Figure 1This embodiment provides a feeder load transfer method that takes into account source-load composition and grid structure diversity, the method comprising: S1: Collects grid information and historical data of the medium voltage distribution network; In a specific embodiment, the grid information includes feeder i Grid structure, rated current carrying capacity ; The historical data includes multiple feeders within a single day i No. t The moment a Load current , No. b Distributed photovoltaic output current , No. c Output current of other distributed power sources Feeder i Get the maximum daily current correspond t Always contact feeder B Current data of the tie switch K L , the sequence information of the segment switches.

[0037] It should be noted that the medium voltage distribution network is a 10kV medium voltage distribution network.

[0038] S2: Perform abnormality judgment and correction processing on the historical data; In a specific embodiment, the method for determining anomalies and correcting the historical data includes: The data is judged and corrected for abnormalities. The double mean method is used to determine whether there is abnormal data. An abnormal current data correction function is constructed based on the least squares method. The abnormal current data correction value is calculated and the abnormal value is replaced.

[0039] In a specific embodiment, please refer to Figure 2 , perform abnormal judgment and correction processing on the data, use the double mean method to determine whether there is abnormal data, and construct an abnormal current data correction function based on the least squares method, calculate the abnormal current data correction value, and replace the abnormal value. The method includes: Calculate feeder i common W Japanese t Average current at all times , as shown below:

[0040] Calculate feeder i of t Standard current difference at all times , as shown below:

[0041] Determine feeder i Is there any current data outside this range? If so, mark it as abnormal data and record the date number of the abnormal data. j , based on the least squares method, the abnormal current data correction function is constructed as shown below:

[0042] The parameters of the correction function are calculated and determined by the normal data after removing the abnormal data, as shown in the following formula:

[0043] in, for t The number of normal dates for time data, j is the number of a normal date; Number the date of the abnormal data j Substitute the correction function to calculate the current correction value and replace the original abnormal data.

[0044] S3: Establish a new distribution network transfer rate model; In a specific embodiment, the method for establishing a new distribution network transfer rate model includes: Defines the average rated load factor of the line K , as shown below:

[0045] Calculation considering grid structure" N -1" fault feeder i Normal operating current limit , as shown below:

[0046] Calculate feeder i Maximum daily current and daily maximum load factor , the calculation process is as follows:

[0047]

[0048]

[0049] in, For feeder i exist t Line current value at the moment; For feeder i exist t Momenta User load current; For feeder i exist t Moment b Distributed photovoltaic output current; For feeder i exist t Moment c Output current of other distributed power sources; is the total number of user loads; is the total number of distributed photovoltaics; is the total number of other distributed power sources; Define feeder i The feeder capacity that is not utilized under the current operating status is called feeder i Capacity margin , which is calculated as follows:

[0050] Define feeder i The ratio of the load margin to the rated current carrying capacity of the feeder is called the transfer rate. , which is calculated as follows: .

[0051] S4: Calculate the transferability of the feeder based on the new distribution network transferability model and the corrected historical data, and evaluate its transferability; In a specific embodiment, please refer to Figure 3 The method for calculating the transferability of feeders based on the new distribution network transferability model and the corrected historical data and evaluating their transferability includes: Calculate the feeder i Load current at each moment , average load capacity limit , determine the feeder i Maximum current moment t And the corresponding daily maximum current value , daily maximum load rate , set the transfer warning limit ; Determine the maximum daily load factor Is it greater than the overload limit? : If so, the feeder is judged to be overloaded; If not, further determine whether to overload; Determine the maximum daily load factor Is it greater than the overload limit? : If so, the feeder is judged to be overloaded; If not, further determine whether to overload; Determine the maximum daily load factor Is it greater than the average rated load rate of the line? : If so, it is determined that the feeder has no power transfer capability; If not, calculate the capacity margin and transfer rate ; Determine the maximum daily load factor Is it greater than the transfer warning limit? : If so, it is determined that the feeder's power transfer capacity is small and a power transfer warning is issued; If not, it is judged that the feeder has good transfer load bearing capacity.

[0052] S5: formulating a feeder load transfer strategy based on the transferability rate and transfer capacity evaluation result; In a specific embodiment, please refer to Figure 4 as well as Figure 5 The method for formulating a feeder load transfer strategy based on the transferability rate and transfer capacity evaluation results includes: 1) Confirm the feeder i Interconnection feeder B Sequence of segment switches , the first section switch close to the tie switch is , close to the feeder B The first section switch of the first section of the line is ; 2) Calculate feeder B Partition x The total current is shown in the following formula:

[0053] in, For feeder B Partition x correspond t The moment a User load current; For feeder B Partition x correspond t The moment b PV output current; For feeder B Partition x correspond t The moment c Output current of other distributed power sources; For feeder B Partition xTotal number of user loads; For feeder B Partition x Total number of distributed photovoltaics, For feeder B Partition x Total number of other distributed power sources; 3) From the feeder B The first zone near the tie switch n To begin, calculate the feeder B Partition n To partition nm ( m =0,1,…, n -1) load is transferred to the feeder i The feeder occupancy rate after φ is calculated as follows:

[0054] 4) Comparison of feeder occupancy rates With feeder i The transfer rate : like ,make m+ 1, repeat step 3); like , then go to step 5); 5) Determine the load transfer strategy for the feeder: Please refer to Figure 5 : like m =0, on the feeder i No contact feeder B The diversion capability is insufficient, so no diversion is carried out; like m ≠0, then the feeder i Equipped with B partition for interconnecting feeder n-m+ 1 to partition n The ability to transfer the load, the tie switch K L Closed, section switch K Fn to K Fn-m+1 closure, K Fn-m Disconnect, then the contact feeder B Partition n To partition n-m+ 1 load is transferred to the feeder i .

[0055] Example 2 Please refer to Figure 1This embodiment provides a feeder load transfer method that takes into account source-load composition and grid structure diversity, the method comprising: S1: Collects grid information and historical data of the medium voltage distribution network; S2: Perform abnormality judgment and correction processing on the historical data; S3: Establish a new distribution network transfer rate model; S4: Calculate the transferability of the feeder based on the new distribution network transferability model and the corrected historical data, and evaluate its transferability; S5: Formulate a feeder load transfer strategy based on the transferability rate and transfer capacity evaluation results.

[0056] In a specific embodiment, a set of feeder group data is used for example analysis. i The wiring mode is single contact wiring, the average rated load rate is 50%, the rated current is 646A, and the rated contact feeder B There are 5 partitions, such as Figure 6 As shown, the goal is to calculate the feeder i The power transfer rate can be determined and a power transfer strategy can be formulated. i The total line current curve and the curve after data correction are as follows: Figure 7 as well as Figure 8 As shown, the maximum daily current is 236.4A.

[0057] Calculate the feeder i The maximum daily load rate is 36.60%, the feeder capacity margin is 86.6A, and the transfer rate is 13.4%. B The total current from zone 5 to zone 1 is 37.4A, 16.4A, 27.1A, 63.2A, 53.9A. The connecting feeder is determined by the method of the present invention. B The load of zones 3 to 5 can be transferred to the feeder i , at this time the feeder i The load factor is 49.12%, and the operation method is to close the tie switch K L and section switches K F5 to K F3 , disconnect the section switch K F2 , realize the connection feeder B Loads from Zones 3 to 5 are transferred to the feeder i , which helps to improve the operating efficiency of the distribution network, effectively enhance the grid’s ability to respond to emergencies, and ensure the continuity and reliability of power supply.

[0058] Example 3 This embodiment provides a feeder load transfer system that takes into account the source-load composition and the diversity of grid structures. The system includes: Data acquisition module, used to collect grid information and historical data of the medium voltage distribution network; A data correction module is used to perform abnormality judgment and correction processing on the historical data; Model building module, used to establish a new distribution network transfer rate model; A transfer capacity evaluation module, configured to calculate the transfer rate of a feeder based on the novel distribution network transfer rate model and the corrected historical data, and evaluate its transfer capacity; The transfer decision module is used to formulate a feeder load transfer strategy based on the transfer rate and transfer capacity evaluation results.

[0059] Example 4 This embodiment provides a computer-readable storage medium having a computer program stored thereon. When the computer program is executed by a processor, the steps of the feeder load transfer method considering the source-load composition and grid structure diversity described in embodiment 1 are implemented. Example 5 This embodiment provides a computer-readable storage medium having a computer program stored thereon. When the computer program is executed by a processor, the steps of the feeder load transfer method considering the source-load composition and grid structure diversity described in embodiment 1 are implemented. Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Those skilled in the art will appreciate that other variations or modifications can be made based on the above description. It is not necessary and impossible to enumerate all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the claims of the present invention.

Claims

1. A feeder load transfer method considering source-load composition and grid structure diversity, characterized in that: The method comprises: Collect grid information and historical data of medium voltage distribution network; Performing abnormality judgment and correction processing on the historical data; Establish a new distribution network transfer rate model; Calculate the transferability of feeders based on the new distribution network transferability model and the revised historical data, and evaluate their transferability; A feeder load transfer strategy is formulated based on the transferability rate and transfer capacity evaluation results.

2. A feeder load transfer method considering source-load composition and grid structure diversity according to claim 1, characterized in that: The grid information includes feeder i Grid structure, rated current carrying capacity ; The historical data includes multiple feeders within a single day i No. t The moment a Load current , No. b Distributed photovoltaic output current , No. c Output current of other distributed power sources Feeder i Get the maximum daily current correspond t Always contact feeder B Current data of the tie switch K L , the sequence information of the segment switches.

3. A feeder load transfer method considering source-load composition and grid structure diversity according to claim 1, characterized in that: The method for performing abnormality judgment and correction processing on the historical data includes: The data is judged and corrected for abnormalities. The double mean method is used to determine whether there is abnormal data. An abnormal current data correction function is constructed based on the least squares method. The abnormal current data correction value is calculated and the abnormal value is replaced.

4. A feeder load transfer method considering source-load composition and grid structure diversity according to claim 3, characterized in that: The data is judged and corrected for abnormalities. The double mean method is used to determine whether abnormal data exists. The abnormal current data correction function is constructed based on the least squares method. The abnormal current data correction value is calculated and the method of replacing the abnormal value includes: Calculate feeder i common W Japanese t Average current at all times , as shown below: Calculate feeder i of t Standard current difference at all times , as shown below: Determine feeder i Is there any current data outside this range? If so, mark it as abnormal data and record the date number of the abnormal data. j , based on the least squares method, the abnormal current data correction function is constructed as shown below: The parameters of the correction function are calculated and determined by the normal data after removing the abnormal data, as shown in the following formula: in, for t The number of normal dates for time data, j is the number of a normal date; Number the date of the abnormal data j Substitute the correction function to calculate the current correction value and replace the original abnormal data.

5. A feeder load transfer method considering source-load composition and grid structure diversity according to claim 2, characterized in that: The methods for establishing a new distribution network transfer rate model include: Defines the average rated load factor of the line K , as shown below: Calculation considering grid structure" N -1" fault feeder i Normal operating current limit , as shown below: Calculate feeder i Maximum daily current and daily maximum load factor , the calculation process is as follows: in, For feeder i exist t Line current value at the moment; For feeder i exist t Moment a User load current; For feeder i exist t Moment b Distributed photovoltaic output current; For feeder i exist t Moment c Output current of other distributed power sources; is the total number of user loads; is the total number of distributed photovoltaics; is the total number of other distributed power sources; Define feeder i The feeder capacity that is not utilized under the current operating status is called feeder i Capacity margin , which is calculated as follows: Define feeder i The ratio of the load margin to the rated current carrying capacity of the feeder is called the transfer rate. , which is calculated as follows: 。 6. A feeder load transfer method considering source-load composition and grid structure diversity according to claim 5, characterized in that: The method for calculating the transferability of feeders based on the new distribution network transferability model and the corrected historical data and evaluating their transferability includes: Calculate the feeder i Load current at each moment , average load capacity limit , determine the feeder i Maximum current moment t And the corresponding daily maximum current value , daily maximum load rate , set the transfer warning limit ; Determine the maximum daily load factor Is it greater than the overload limit? : If so, the feeder is judged to be overloaded; If not, further determine whether to overload; Determine the maximum daily load factor Is it greater than the overload limit? : If so, the feeder is judged to be overloaded; If not, further determine whether to overload; Determine the maximum daily load factor Is it greater than the average rated load rate of the line? : If so, it is determined that the feeder has no power transfer capability; If not, calculate the capacity margin and transfer rate ; Determine the maximum daily load factor Is it greater than the transfer warning limit? : If so, it is determined that the feeder's power transfer capacity is small and a power transfer warning is issued; If not, it is judged that the feeder has good transfer load bearing capacity.

7. A feeder load transfer method considering source-load composition and grid structure diversity according to claim 6, characterized in that: The method for formulating a feeder load transfer strategy based on the transferability rate and transfer capacity evaluation results includes: 1) Confirm the feeder i Interconnection feeder B Sequence of segment switches , the first section switch close to the tie switch is , close to the feeder B The first section switch of the first section of the line is ; 2) Calculate feeder B Partition x The total current is shown in the following formula: in, For feeder B Partition x correspond t The moment a User load current; For feeder B Partition x correspond t The moment b PV output current; For feeder B Partition x correspond t The moment c Output current of other distributed power sources; For feeder B Partition x Total number of user loads; For feeder B Partition x Total number of distributed photovoltaics, For feeder B Partition x Total number of other distributed power sources; 3) From the feeder B The first zone near the tie switch n To begin, calculate the feeder B Partition n To partition nm ( m =0,1,…, n -1) load is transferred to the feeder i The feeder occupancy rate after φ is calculated as follows: 4) Comparison of feeder occupancy rates With feeder i The transfer rate : like ,make m+ 1, repeat step 3); like , then go to step 5); 5) Determine the load transfer strategy for the feeder: like m =0, on the feeder i No contact feeder B The company has no ability to transfer supply, so no transfer is made; like m ≠0, then the feeder i Equipped with B partition for interconnecting feeder n-m+ 1 to partition n The ability to transfer the load, the tie switch K L Closed, section switch K Fn to K Fn-m+1 closure, K Fn-m Disconnect, then the contact feeder B Partition n To partition n-m+ 1 load is transferred to the feeder i .

8. A feeder load transfer system that takes into account the source-load composition and grid structure diversity, characterized in that: The system comprises: Data acquisition module, used to collect grid information and historical data of the medium voltage distribution network; A data correction module is used to perform abnormality judgment and correction processing on the historical data; Model building module, used to establish a new distribution network transfer rate model; A transfer capacity evaluation module, configured to calculate the transfer rate of a feeder based on the novel distribution network transfer rate model and the corrected historical data, and evaluate its transfer capacity; The transfer decision module is used to formulate a feeder load transfer strategy based on the transfer rate and transfer capacity evaluation results.

9. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of a feeder load transfer method considering source-load composition and grid structure diversity as described in any one of claims 1 to 7 are implemented.

10. A computer device, characterized in that: The method comprises a storage medium, a processor, and a computer program stored in the storage medium and executable by the processor, wherein when the computer program is executed by the processor, the method implements the steps of a feeder load transfer method taking into account source-load composition and grid structure diversity as described in any one of claims 1 to 7.

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