A method for inter-grid power mutual assistance in active distribution network

Abstract

The present invention discloses a method for inter-grid power mutual assistance of an active distribution network; the electric field load is initially distributed by fully considering the power protection level of the power protection area and the historical load; at the same time, the load consumption data in the circuit is collected in real time, and the surrounding grid intervals are selected according to the load consumption state of the circuit to redistribute the charge, and the charge redistribution needs to consider its own power, power protection level and other factors, so as to ensure that the power protection area has priority in power supply while completing the power mutual assistance of various areas on the active distribution network.

Description

Technical Field

[0001] The present invention relates to the field of active distribution networks, and in particular to a method for inter-grid power mutual assistance in active distribution networks. Background Art

[0002] As the peak power load of the whole society continues to break records, the peak load regulation pressure of the power grid is increasing. In order to liberate the construction and development of high-elasticity power grids, it is urgent to develop more extensive demand response means. In the current society, the development of science and technology has caused the power consumption to gradually increase. During the peak power consumption period, the power load in some areas is relatively abundant, while the power load in some areas is seriously insufficient. Power plants need to make corresponding adjustments to meet the power supply guarantee of modern work and life.

[0003] For example, a method for DC power mutual assistance of an AC system with multiple UHV DC feeds disclosed in Chinese patent literature, with publication number CN112054550B, constructs a constraint model of the AC system at the sending and receiving ends by using the Thevenin equivalent parameters of the AC system at the sending and receiving ends and the equivalent PQ node parameters of the AC side at the receiving and sending ends obtained by the quasi-steady-state mathematical model; under multiple constraints, the maximum value of the active power fed into each DC line is optimized and solved, and the adjustable capacity of the DC line is corrected according to the current DC operating state and the equivalent inertia of the AC system at the sending end of the DC line, and the frequency and current reference droop coefficient of the DC line is calculated accordingly, and the DC current reference value of the DC line is adjusted. This invention gives full play to the role of power mutual assistance between multiple-feed DC lines, enhances the power support capacity to improve the stability and robustness of the AC system at the receiving end. However, this power mutual assistance is only for two circuits, and cannot distribute loads in multiple circuits, and cannot adapt to the power mutual assistance in the full distribution network environment of the active distribution network. Summary of the invention

[0004] The present invention mainly aims at the problem that the existing technology does not take into account the lack of regional power supply in the process of load distribution of active distribution network, but cannot provide feedback to supplement it. It provides a method for inter-grid power mutual assistance of active distribution network. By fully considering the power protection level and historical load of the power protection area, the electric field load is initially distributed. At the same time, the load consumption data in the circuit is collected in real time, and the surrounding grid intervals are selected according to the load consumption state of the circuit to redistribute the charge. The charge redistribution needs to consider its own power supply, power protection level and other factors, so as to ensure that the power protection area is given priority in power supply while completing the power mutual assistance of various areas on the active distribution network.

[0005] The above technical problems of the present invention are mainly solved by the following technical solutions:

[0006] A method for inter-grid power mutual assistance of an active distribution network, the method comprising:

[0007] Step S1, dividing the substation into different grid sections according to functions; marking the grid sections; collecting historical information of circuit breakers to obtain load consumption estimation data of each grid section; performing initial power distribution according to the load consumption estimation data;

[0008] Step S2: Collect real-time information of circuit breakers to obtain the power load of each grid section; mark the rich grid section and the scarce grid section according to the ratio of load consumption and initial allocation data;

[0009] Step S3, redistributing the loads of each grid interval;

[0010] Step S4, collect and redistribute the load consumption information of the day; adjust the proportion of the load consumption data of the day, and re-plan the initial allocation for the next day.

[0011] The electric field load is initially distributed by fully considering the power supply level and historical load of the power supply protection area. At the same time, the load consumption data in the circuit is collected in real time, and the surrounding grid intervals are selected for charge redistribution according to the load consumption status of the circuit. The charge redistribution needs to consider factors such as its own power supply and power supply level to ensure that the power supply to the power supply protection area is given priority while completing the power mutual assistance of each area on the active distribution network.

[0012] Preferably, the steps of initial load distribution are as follows:

[0013] S21: fitting the historical daily average load change data of users in each grid interval through a clustering algorithm to form a load consumption estimation curve;

[0014] S22: Calculate the daily load consumption of each grid interval according to the load consumption estimation curve;

[0015] S23: Prioritize the power conservation area; allocate load power to other areas according to the proportion of daily load consumption.

[0016] Since the power load is related to the environment in recent days, and the environment in consecutive days generally does not change significantly, it is necessary to consider the historical load consumption data of the recent period to make an initial allocation of power. The power conservation area is the priority allocation area.

[0017] Preferably, the rich area and the poor area are divided according to the following method:

[0018] Step S31, marking the daily load consumption status in real time and comparing it with the power consumption in the load consumption estimation curve;

[0019] Step S32: if the real-time power exceeds the power predicted by the load consumption estimation curve, then mark the time point and record the time period in which the power exceeds the prediction, and the accumulated time period is recorded as t1; if the real-time power is lower than the power predicted by the load consumption estimation curve by more than 5%, then mark the time point and record the time period in which the power is lower than the prediction, and the accumulated time period is recorded as t2;

[0020] Step S33: if t1 is greater than two hours, mark the interval as a scarce grid interval; if t2 is greater than two hours, mark the interval as a rich grid interval.

[0021] When the power consumption of the scarce grid area exceeds the expected power consumption, even a small power gap is enough to cause a power outage, which in turn affects the quality of life, so this time needs to be marked. However, the abundant power in the rich grid area will not affect daily life and work, and this area needs to maintain a certain amount of power, so it needs to exceed 5% to be recorded as a rich grid area.

[0022] As a preference, the power supply protection areas are arranged as follows: hospital>school>factory>commercial area=residential area, and the power supply protection areas that need power supply protection are divided according to their importance.

[0023] Preferably, the load redistribution method for the scarce grid interval is as follows:

[0024] Step S51, according to the active distribution network topology, obtaining the location, energy storage capacity and load consumption information of the grid intervals around the scarce grid interval;

[0025] Step S52: determine whether the surrounding grid interval is a scarce grid interval; the surrounding scarce network interval does not participate in this load redistribution;

[0026] Step S53, determine the power protection level of the grid interval; if the power protection level is higher than the scarce grid interval, do not participate in load redistribution; if the power protection level is lower than the scarce network interval, weighted proportion is performed according to the power protection level;

[0027] Step S54, analyzing the energy storage capacity within the grid interval participating in this load redistribution; determining the redistributed load capacity according to the energy storage capacity;

[0028] Step S55: redistribute the load to the scarce grid interval according to the optimal load absorption path.

[0029] The grid-scarce section needs to first determine the type of the surrounding area. Since the power conservation levels have priorities, it is necessary to compare the power conservation levels of the grid sections before allocating the power.

[0030] As a preferred method, the method of confirming the lack of grid interval and the surrounding grid interval to redistribute the load capacity is as follows:

[0031] Step S61, collecting load consumption information of surrounding grid intervals; assuming that the number of grid intervals participating in the allocation is N;

[0032] Step S62: The allocation amount of each grid interval is allocated according to the following formula:

[0033]

[0034] Where Q is the load required in the scarce grid interval; λ1, λ2, λ3, λ4, λ5, and λ6 are the factory load weighting coefficient, commercial area load weighting coefficient, residential area load weighting coefficient, school load weighting coefficient, hospital load weighting coefficient, and other places load weighting coefficient respectively;

[0035] a1, a2, a3, a4, a5, and a6 are the ratio of the factory's remaining load to the factory's initially allocated load, the ratio of the commercial area's remaining load to the commercial area's initially allocated load, the ratio of the residential area's remaining load to the residential area's initially allocated load, the ratio of the school's remaining load to the school's initially allocated load, the ratio of the hospital's remaining load to the hospital's initially allocated load, and the ratio of the remaining load of other places to the initially allocated load of other places;

[0036] Q1, Q2, Q3, Q4, Q5, Q i They are the factory load, commercial area load, residential area load, school load, hospital load and the load of the ith other place;

[0037] where λ j a j Q j Redistribute the charge to each grid interval; j takes values ​​from 1 to N.

[0038] The grid load power is allocated according to the conditions of different grid intervals. The grid interval with insufficient power needs to obtain load power from outside, so the power needs to be adjusted to a certain extent.

[0039] Preferably, the load redistribution method of the rich grid interval is as follows:

[0040] Step S71, according to the active distribution network topology, obtain the location, energy storage capacity and load consumption information of the grid intervals around the rich grid interval;

[0041] Step S72: determine whether the surrounding grid interval is a rich grid interval; the surrounding rich network interval does not participate in this load redistribution;

[0042] Step S73, determine the power supply level of the grid interval; if the power supply level is higher than that of the rich grid interval, it will be preferentially involved in load redistribution; if the power supply level is lower than that of the rich network interval, weighted allocation will be made according to the power supply level;

[0043] Step S74, analyzing the energy storage capacity within the grid interval participating in load redistribution; determining the redistributed load capacity according to the energy storage capacity;

[0044] Step S75: Redistribute the load to each grid interval around the rich grid interval according to the optimal load consumption path.

[0045] The wealthy grid section needs to first determine the type of the surrounding area. Since the power supply levels have priorities, it is necessary to compare the power supply levels of the grid sections before allocating the electricity.

[0046] As a preferred method, the method of confirming the load capacity of the rich grid interval and its surrounding grid intervals for redistribution is as follows:

[0047] Step S81, collecting load consumption information of surrounding grid intervals; assuming that the number of grid intervals participating in the allocation is N;

[0048] Step S82: The allocation amount of each grid interval is allocated according to the following formula:

[0049]

[0050] Among them, Q is the surplus load of the rich grid interval, that is, 2% of the initial allocated load of the day; y1, y2, y3, y4, y5, y6 are the factory load weighting coefficient, commercial area load weighting coefficient, residential area load weighting coefficient, school load weighting coefficient, hospital load weighting coefficient and other places load weighting coefficient respectively;

[0051] b1, b2, b3, b4, b5, and b6 are the ratio of the remaining load of factories to the initially allocated load of factories, the ratio of the remaining load of commercial areas to the initially allocated load of commercial areas, the ratio of the remaining load of residential areas to the initially allocated load of residential areas, the ratio of the remaining load of schools to the initially allocated load of schools, the ratio of the remaining load of hospitals to the initially allocated load of hospitals, and the ratio of the remaining load of other places to the initially allocated load of other places;

[0052] Q1, Q2, Q3, Q4, Q5, Q i They are the factory load, commercial area load, residential area load, school load, hospital load and the load of the ith other place;

[0053] where y j b j Q j Redistribute the charge to each grid interval; j takes values ​​from 1 to N.

[0054] Grid load power is rationed according to different grid interval conditions. In the surplus interval, power needs to be given outwards. Therefore, the power needs to be adjusted to some extent. Preferably, in the redistribution of the deficit grid interval, λ5 < λ4 < λ1 < λ2 = λ3 < λ6; in the redistribution of the surplus grid interval, y1 < y3 = < y2 < y1 < y4 < y5. Since the power protection area needs to retain its own power as much as possible when distributing outwards, the power protection area needs to reduce the external distribution amount according to the power protection level; when rationing power inwards, the power protection area needs to ration as much power as possible, so it is necessary to increase the internal rationing amount according to the power protection level.

[0055] Preferably, the optimal load consumption path is as follows:

[0056] Step S101: Take the grid interval as the load node based on the active distribution network;

[0057] Step S102: Refer to the distribution network path information database between load nodes. Take the grid interval that needs to be redistributed as the reference node, retrieve the movement paths of the reference node passing through different load nodes along each distribution network path, and calculate the movement costs of each path;

[0058] Step S103: Assume that the node with the minimum movement cost on a single, non-loop line is the nearest node relative to the reference node;

[0059] Step S104: The scope of the grid intervals around the surplus grid interval or the deficit grid interval is defined at all the nearest nodes;

[0060] Step S105: Set the path from the reference node to the nearest node as the optimal load consumption path.

[0061] The optimal consumption path can ensure that in the distribution process, each distribution path is distributed in the case of the least consumption, avoiding unnecessary power loss caused by path distribution.

[0062] The beneficial effects of the present invention are as follows:

[0063] By fully considering the power protection level and historical load of the power protection area, the initial distribution of the electric field load is carried out; at the same time, the load consumption data in the circuit is collected in real time, and the surrounding grid intervals are selected according to the load consumption state of the circuit for charge redistribution. The charge redistribution needs to consider factors such as its own power and power protection level, ensuring power supply to the power protection area first while achieving power mutual assistance in each area of the active distribution network. BRIEF DESCRIPTION OF THE DRAWINGS

[0064] Figure 1 It is a flowchart of the method adopted by the present invention. DETAILED DESCRIPTION

[0065] It should be understood that the embodiments are only used to illustrate the present invention and are not used to limit the scope of the present invention. In addition, it should be understood that after reading the content taught by the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms also fall within the scope limited by the appended claims of the application.

[0066] The technical solution of the present invention is further specifically described below through embodiments.

[0067] A method for inter-grid power mutual assistance of an active distribution network, comprising:

[0068] 1. Divide the grid intervals; collect the historical information of the circuit breaker to obtain the load consumption estimate data of each grid interval; and make the initial distribution of electricity according to the load consumption estimate data:

[0069] During the initial allocation process, it is first necessary to fit the historical daily average load change data of users in each grid interval through a clustering algorithm to form a load consumption estimation curve; and calculate the daily load consumption of each grid interval based on the load consumption estimation curve.

[0070] The electricity needs to be allocated to the power conservation area first; other areas are allocated load electricity according to the proportion of daily load consumption.

[0071] Second, collect real-time information of circuit breakers to obtain the power load of each grid area; mark the rich grid area and the scarce grid area according to the ratio of load consumption and initial allocation data:

[0072] Mark the daily load consumption status in real time and compare it with the power consumption in the load consumption estimation curve; if the real-time power exceeds the predicted power of the load consumption estimation curve, mark the time point and record the time period when the power exceeds the predicted power, and the cumulative record of this time period is t1; if the real-time power is lower than the predicted power of the load consumption estimation curve by more than 5%, mark the time point and record the time period when the power is lower than the predicted power, and the cumulative record of this time period is t2.

[0073] If t1 is greater than two hours, the interval is marked as a scarce grid interval; if t2 is greater than two hours, the interval is marked as a rich grid interval.

[0074] The marking of the abundant interval can ensure that the abundant interval has a certain amount of self-reserved electricity, while the scarce interval requires emergency supplementary control of the electricity load to reduce the downward trend.

[0075] 3. Redistribute the load between grid sections:

[0076] The load redistribution method for the scarce grid interval is as follows:

[0077] Step 1: According to the active distribution network topology, the location, energy storage capacity and load absorption information of the grid intervals around the scarce grid interval are obtained.

[0078] Step 2: determine whether the surrounding grid interval is a scarce grid interval; the surrounding scarce network interval does not participate in this load redistribution.

[0079] Step 3, determine the power supply level of the grid interval; if the power supply level is higher than the scarce grid interval, it will not participate in load redistribution; if the power supply level is lower than the scarce network interval, it will be weighted according to the power supply level; λ1, λ2, λ3, λ4, λ5, λ6 are the factory load weighting coefficient, commercial area load weighting coefficient, residential area load weighting coefficient, school load weighting coefficient, hospital load weighting coefficient and other places load weighting coefficient respectively;

[0080] Step 4: Analyze the energy storage capacity within the grid interval participating in this load redistribution; determine the redistributed load capacity based on the energy storage capacity:

[0081] Assume that the number of grid intervals participating in the allocation is N; the allocation amount of each grid interval is allocated according to the following formula:

[0082]

[0083] Wherein, Q is the required load in the scarce grid interval; a1, a2, a3, a4, a5, and a6 are the ratio of the remaining load of the factory to the initially allocated load of the factory, the remaining load of the commercial area to the initially allocated load of the commercial area, the remaining load of the residential area to the initially allocated load of the residential area, the remaining load of the school to the initially allocated load of the school, the remaining load of the hospital to the initially allocated load of the hospital, and the remaining load of other places to the initially allocated load of other places;

[0084] Q1, Q2, Q3, Q4, Q5, Q i They are the factory load, commercial area load, residential area load, school load, hospital load and the load of the ith other place;

[0085] where λ j a j Q j Redistribute the charge to each grid interval; j takes values ​​from 1 to N.

[0086] The load redistribution method of the rich grid interval is as follows:

[0087] Step 1: According to the active distribution network topology, the location, energy storage capacity and load absorption information of the grid intervals around the rich grid interval are obtained.

[0088] Step 2: determine whether the surrounding grid interval is a rich grid interval; the surrounding rich network interval does not participate in this load redistribution.

[0089] Step 3, determine the power supply level of the grid interval; if the power supply level is higher than that of the rich grid interval, it will be given priority in participating in load redistribution; if the power supply level is lower than that of the rich network interval, it will be weighted according to the power supply level; y1, y2, y3, y4, y5, y6 are the factory load weighting coefficient, commercial area load weighting coefficient, residential area load weighting coefficient, school load weighting coefficient, hospital load weighting coefficient and other places load weighting coefficient respectively.

[0090] Step 4: Analyze the energy storage capacity within the grid interval involved in load redistribution; determine the redistributed load capacity based on the energy storage capacity:

[0091] Assume that the number of grid intervals participating in the allocation is N; the allocation amount of each grid interval is allocated according to the following formula:

[0092]

[0093] Among them, Q is the surplus load in the rich grid interval, that is, 2% of the initial allocated load of the day; b1, b2, b3, b4, b5, b6 are the proportion of the surplus load of the factory to the initial allocated load of the factory, the proportion of the surplus load of the commercial area to the initial allocated load of the commercial area, the proportion of the surplus load of the residential area to the initial allocated load of the residential area, the proportion of the surplus load of the school to the initial allocated load of the school, the proportion of the surplus load of the hospital to the initial allocated load of the hospital, and the proportion of the surplus load of other places to the initial allocated load of other places;

[0094] Q1, Q2, Q3, Q4, Q5, Q i They are the factory load, commercial area load, residential area load, school load, hospital load and the load of the ith other place;

[0095] where y j b j Q j Redistribute the charge to each grid interval; j takes values ​​from 1 to N.

[0096] Step 5: Redistribute the load to each grid interval around the rich grid interval according to the optimal load absorption path.

[0097] Third, redistribute the load to the scarce grid interval according to the optimal load consumption path:

[0098] Step S101: taking the grid interval as a load node based on the active distribution network;

[0099] Step S102, referring to the distribution network path information database between load nodes, taking the grid interval that needs to be redistributed as a reference node, retrieving the movement path of the reference node passing through different load nodes along each distribution network path, and calculating the movement cost of each path;

[0100] Step S103: Assume that the node with the smallest moving cost on the single non-loop line is the nearest node relative to the reference node;

[0101] Step S104: all the nearest nodes are the demarcation range of the grid intervals around the rich grid interval or the scarce grid interval;

[0102] Step S105: The path from the reference node to the nearest node is set as the optimal load absorption path.

[0103] Fourth, collect and redistribute the load consumption information of the day; adjust the proportion of the load consumption data of the day, and re-plan the initial allocation for the next day.

Claims

1. A method for inter-grid power mutual assistance in an active distribution network, characterized in that: The method comprises: Step S1, divide the substation into different grid intervals according to function; mark the grid intervals; collect the historical information of the circuit breaker to obtain the load consumption estimation data of each grid interval; perform the initial distribution of electricity according to the load consumption estimation data: fit the historical daily average load change data of users in each grid interval through the clustering algorithm to form a load consumption estimation curve, calculate the daily load consumption of each grid interval, give priority to the power protection area, and allocate the load electricity to other areas according to the proportion of daily load consumption; Step S2: Collect real-time information of circuit breakers to obtain the power load of each grid section; mark the rich grid section and the scarce grid section according to the ratio of load consumption and initial allocation data; Step S3, load redistribution of each grid interval: surrounding grid intervals of the same type as the grid interval do not participate in the redistribution; surrounding grid intervals that meet the redistribution conditions, if the power supply level is lower than that of the grid interval, are weighted according to the power supply level; if the power supply level of the surrounding grid interval of the rich grid interval is higher than that of the rich grid interval, it is given priority for redistribution; the redistributed load capacity is determined according to the energy storage capacity; Step S4, collect and redistribute the load consumption information of the day; adjust the proportion of the load consumption data of the day, and re-plan the initial allocation for the next day.

2. The method for inter-grid power mutual assistance of an active distribution network according to claim 1, characterized in that: The steps of initial load distribution are as follows: S21: fitting the historical daily average load change data of users in each grid interval through a clustering algorithm to form a load consumption estimation curve; S22: Calculate the daily load consumption of each grid interval according to the load consumption estimation curve; S23: Prioritize the power conservation area; allocate load power to other areas according to the proportion of daily load consumption.

3. The method for inter-grid power mutual assistance of an active distribution network according to claim 1, characterized in that: The rich grid interval and the scarce grid interval are divided according to the following method: Step S31, marking the daily load consumption status in real time and comparing it with the power consumption in the load consumption estimation curve; Step S32: if the real-time power exceeds the power predicted by the load consumption estimation curve, then mark the time point and record the time period in which the power exceeds the prediction, and the accumulated time period is recorded as t1; if the real-time power is lower than the power predicted by the load consumption estimation curve by more than 5%, then mark the time point and record the time period in which the power is lower than the prediction, and the accumulated time period is recorded as t2; Step S33: if t1 is greater than two hours, mark the interval as a scarce grid interval; if t2 is greater than two hours, mark the interval as a rich grid interval.

4. The method for inter-grid power mutual assistance of an active distribution network according to claim 1, characterized in that: The power supply protection levels are arranged as follows: hospital > school > factory > commercial area = residential area.

5. The method for inter-grid power mutual assistance of an active distribution network according to claim 4, characterized in that: The load redistribution method for the scarce grid interval is as follows: Step S51, according to the active distribution network topology, obtaining the location, energy storage capacity and load consumption information of the grid intervals around the scarce grid interval; Step S52: determine whether the surrounding grid interval is a scarce grid interval; the surrounding scarce grid interval does not participate in this load redistribution; Step S53, determine the power protection level of the grid interval; if the power protection level is higher than the scarce grid interval, then do not participate in load redistribution; if the power protection level is lower than the scarce grid interval, then weighted proportion is performed according to the power protection level; Step S54, analyzing the energy storage capacity within the grid interval participating in this load redistribution; determining the redistributed load capacity according to the energy storage capacity; Step S55: redistribute the load to the scarce grid interval according to the optimal load absorption path.

6. The method for inter-grid power mutual assistance of an active distribution network according to claim 5, characterized in that: The method for identifying the scarce grid area and its surrounding grid areas to redistribute load capacity is as follows: Step S61, collecting load consumption information of surrounding grid intervals; assuming that the number of grid intervals participating in the allocation is N; Step S62: The allocation amount of each grid interval is allocated according to the following formula: Where Q is the load required in the scarce grid interval; λ1, λ2, λ3, λ4, λ5, and λ6 are the factory load weighting coefficient, commercial area load weighting coefficient, residential area load weighting coefficient, school load weighting coefficient, hospital load weighting coefficient, and other places load weighting coefficient respectively; a1, a2, a3, a4, a5, and a6 are the ratio of the factory's remaining load to the factory's initially allocated load, the ratio of the commercial area's remaining load to the commercial area's initially allocated load, the ratio of the residential area's remaining load to the residential area's initially allocated load, the ratio of the school's remaining load to the school's initially allocated load, the ratio of the hospital's remaining load to the hospital's initially allocated load, and the ratio of the remaining load of other places to the initially allocated load of other places; Q1, Q2, Q3, Q4, Q5, Q i They are the factory load, commercial area load, residential area load, school load, hospital load and the load of the ith other place; where λ j a j Q j Redistribute the charge to each grid interval; j takes values ​​from 1 to N.

7. The method for inter-grid power mutual assistance of an active distribution network according to claim 6, characterized in that: The load redistribution method of the rich grid interval is as follows: Step S71, according to the active distribution network topology, obtain the location, energy storage capacity and load consumption information of the grid intervals around the rich grid interval; Step S72: determine whether the surrounding grid interval is a rich grid interval; the surrounding rich grid interval does not participate in this load redistribution; Step S73, determine the power supply level of the grid interval; if the power supply level is higher than that of the rich grid interval, it will be preferentially involved in load redistribution; if the power supply level is lower than that of the rich grid interval, weighted allocation will be performed according to the power supply level; Step S74, analyzing the energy storage capacity within the grid interval participating in load redistribution; determining the redistributed load capacity according to the energy storage capacity; Step S75: Redistribute the load to each grid interval around the rich grid interval according to the optimal load consumption path.

8. The method for inter-grid power mutual assistance of an active distribution network according to claim 7, characterized in that: The method for confirming the load capacity of the rich grid interval and its surrounding grid intervals is as follows: Step S81, collecting load consumption information of surrounding grid intervals; assuming that the number of grid intervals participating in the allocation is N; Step S82: The allocation amount of each grid interval is allocated according to the following formula: Among them, Q is the surplus load of the rich grid interval, that is, 2% of the initial allocated load of the day; y1, y2, y3, y4, y5, y6 are the factory load weighting coefficient, commercial area load weighting coefficient, residential area load weighting coefficient, school load weighting coefficient, hospital load weighting coefficient and other places load weighting coefficient respectively; b1, b2, b3, b4, b5, and b6 are the ratio of the remaining load of factories to the initially allocated load of factories, the ratio of the remaining load of commercial areas to the initially allocated load of commercial areas, the ratio of the remaining load of residential areas to the initially allocated load of residential areas, the ratio of the remaining load of schools to the initially allocated load of schools, the ratio of the remaining load of hospitals to the initially allocated load of hospitals, and the ratio of the remaining load of other places to the initially allocated load of other places; Q1, Q2, Q3, Q4, Q5, Q i They are the factory load, commercial area load, residential area load, school load, hospital load and the load of the ith other place; where y j b j Q j Redistribute the charge to each grid interval; j takes values ​​from 1 to N.

9. The method for inter-grid power mutual assistance of an active distribution network according to claim 6 or 8, characterized in that: In the redistribution of the scarce grid interval, λ5<λ4<λ1<λ2=λ3<λ6; in the redistribution of the rich grid interval, y1 <y3=<y2<y1<y4<y5。 10. The method for inter-grid power mutual assistance of an active distribution network according to claim 5 or 7, characterized in that: The optimal load dissipation path is: Step S101: taking the grid interval as a load node based on the active distribution network; Step S102, referring to the distribution network path information database between load nodes, taking the grid interval that needs to be redistributed as a reference node, retrieving the movement path of the reference node passing through different load nodes along each distribution network path, and calculating the movement cost of each path; Step S103: Assume that the node with the smallest moving cost on the single non-loop line is the nearest node relative to the reference node; Step S104: all the nearest nodes are the demarcation range of the grid intervals around the rich grid interval or the scarce grid interval; Step S105: The path from the reference node to the nearest node is set as the optimal load absorption path.

Images