Distribution network intelligent load balancing scheduling method and system

Abstract

The invention provides an intelligent load balancing scheduling method and system for a distribution network, and belongs to the technical field of distribution network scheduling, and the method comprises the following steps: building a power grid scheduling control cloud platform, and importing a power distribution network topology, a heavy overload strategy and the maximum load rate of each line; when it is detected that the power distribution network meets a heavy overload strategy triggering condition, the power grid dispatching control cloud platform identifies a power distribution line needing load transfer according to the load rate of each line; the power grid dispatching control cloud platform identifies interconnection switches on the power distribution line of the load needing to be transferred according to the power distribution network topology, and analyzes the transfer direction corresponding to each interconnection switch to determine a transfer scheme; and the power grid dispatching control cloud platform displays the transfer scheme to the user, and receives the transfer scheme selected by the user to execute distribution line load balancing. Automatic load balancing of the power distribution network is achieved through the power grid dispatching control cloud platform, misoperation of manual distribution network regulation and control is reduced, and working efficiency is improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of distribution network scheduling, and in particular relates to a distribution network intelligent load balancing scheduling method and system. Background Art

[0002] With the development of modern technology and industry, the demand for electricity in all walks of life is increasing, and the requirements for power quality are also getting higher and higher. Continuous, sufficient and high-quality power supply is urgently needed. The distribution network is at the end of the power system, carrying the important role of power distribution and power supply. Uninterrupted power supply is the ultimate goal of power grid power. Reducing the occurrence rate of distribution network accidents and shortening the time for emergency repairs are important contents of distribution network management, which is the basis for ensuring the dimensional operation of the power grid.

[0003] The growth of the load of distribution network users, power grid failures and maintenance work have led to heavy overload pressure on transformers and lines, and this pressure is increasing day by day. Balancing the loads carried by different main transformers and different distribution lines, reducing the operating risks of main transformers and lines, and performing load balancing are important contents for the safe operation of distribution networks. At present, the load balancing of distribution networks is mainly carried out manually. Due to the large number of distribution network lines, the efficiency of manual processing is extremely low, and there is a certain lag in the manual discovery of load imbalance, which is often discovered after a period of time, resulting in risks in the operation of distribution networks and affecting the stable operation of the power grid.

[0004] This is a shortcoming of the prior art. Therefore, it is very necessary to provide a distribution network intelligent load balancing scheduling method and system to address the above-mentioned defects in the prior art. Summary of the invention

[0005] In view of the above-mentioned existing technology, the load balancing of the distribution network is mainly carried out manually. Due to the large number of distribution network lines, the manual processing efficiency is extremely low, and there is a certain lag in the manual discovery of load imbalance, which is often discovered only after a period of time. This leads to risks in the operation of the distribution network and affects the stable operation of the power grid. The present invention provides a distribution network intelligent load balancing scheduling method and system to solve the above technical problems.

[0006] In a first aspect, the present invention provides a distribution network intelligent load balancing scheduling method, comprising the following steps:

[0007] S1. Build a power grid dispatching and control cloud platform, and import the distribution network topology, heavy overload strategy and maximum load rate of each line into the power grid dispatching and control cloud platform;

[0008] S2. When it is detected that the distribution network meets the heavy overload strategy triggering conditions, the power grid dispatching control cloud platform identifies the distribution lines that need to transfer loads based on the relationship between the real-time load rate and the maximum load rate of each line;

[0009] S3. The power grid dispatching and control cloud platform identifies the interconnecting switches on the distribution lines that need to transfer loads according to the distribution network topology, analyzes the transfer direction corresponding to each interconnecting switch, determines the transfer plan and the corresponding opposite line; S4. The power grid dispatching and control cloud platform displays the transfer plan and the load rate changes of the distribution lines and opposite lines that need to transfer loads before and after the transfer to the user, receives the transfer plan selected by the user, and executes the load balancing of the distribution lines.

[0010] Furthermore, the specific steps of step S1 are as follows:

[0011] S11. Build a power grid dispatching and control cloud platform;

[0012] S12. Import the distribution network topology into the power grid dispatching and control cloud platform, and represent the connection relationship of each distribution line and the position relationship of the tie switch;

[0013] S13. Import the main transformer heavy overload strategy and the single feeder heavy overload strategy on the power grid dispatching and control cloud platform; S14. Import the maximum load rate of the distribution grid downlink on the power grid dispatching and control cloud platform;

[0014] S15. The power grid dispatching and control cloud platform connects to the power grid sensor equipment of each distribution line to collect the real-time load rate of each line.

[0015] Furthermore, the specific steps of step S2 are as follows:

[0016] S21. The power grid dispatching control cloud platform determines whether it has received a manually triggered dynamic load balancing and network reconstruction request;

[0017] If yes, go to step S22;

[0018] If not, proceed to step S23;

[0019] S22. The power grid dispatching control cloud platform receives the manually input load value that needs to be reduced, searches for each distribution line that needs to transfer the load according to the main transformer heavy overload strategy, and proceeds to step S3;

[0020] S23. The power grid dispatching and control cloud platform detects each line of the distribution network, identifies the distribution lines whose real-time load rate is greater than the maximum load rate according to the single feeder heavy overload strategy, and uses them as the distribution lines that need to transfer loads.

[0021] Furthermore, the specific steps of step S3 are as follows:

[0022] S31. The power grid dispatching and control cloud platform identifies the interconnection switches of the distribution lines that need to transfer the load and the opposite lines of each interconnection switch according to the distribution topology;

[0023] S32. Position a contact switch;

[0024] S33. Obtain the opposite load corresponding to the located contact switch, and calculate whether the opposite load rate is greater than the maximum load rate;

[0025] If yes, go to step S35;

[0026] If not, proceed to step S34;

[0027] S34. Determine whether the contact switches of the distribution lines that need to transfer the load are positioned;

[0028] If yes, go to step S35;

[0029] If not, locate the next tie switch and return to step S33;

[0030] S35. The power grid dispatching control cloud platform calculates the target load reduction of the distribution lines that need to transfer load;

[0031] S36. The grid dispatching control cloud platform calculates the allowable transfer capacity of the opposite line of the tie switch located;

[0032] S37. Determine whether the allowed transfer amount is greater than the target load reduction amount;

[0033] If yes, go to step S38;

[0034] If not, return to step S34;

[0035] S38. Search for the switch to be divided according to preset rules on the opposite side line of the located tie switch, calculate the load rate of the distribution line after the transfer and save the opposite side line as the transfer plan.

[0036] Furthermore, the specific steps of step S35 are as follows:

[0037] S351. The power grid dispatching control cloud platform calculates the real-time load rate of the distribution line to be transferred, and calculates the first load amount to be reduced based on the maximum load rate as the threshold, so that the real-time load rate is reduced to the maximum load rate;

[0038] S352. The power grid dispatching control cloud platform calculates the average load rate of the distribution network and the real-time load rate of the distribution line to be transferred, and uses the average load rate as a threshold to calculate the second load amount that needs to be reduced, so that the real-time load rate is reduced to the average load rate;

[0039] S353. The power grid dispatching and control cloud platform takes the larger median of the first load and the second load as the target load reduction amount.

[0040] Furthermore, the specific steps of step S38 are as follows:

[0041] S381. On the opposite line of the located tie switch, search for a switch with a load reduction greater than the target load reduction and less than the allowable transfer amount on the opposite side as a proposed split switch in the direction from the tie switch to the main grid load;

[0042] If a switch that meets the conditions is found, the process goes to step S383;

[0043] If no switch that meets the conditions is found, the process goes to step S382;

[0044] S382. On the opposite side of the located tie switch, search for a switch with a smaller transfer capacity than the opposite side in the direction from the main grid load to the tie switch as a proposed split switch;

[0045] If a switch that meets the conditions is found, the process goes to step S383;

[0046] If no switch that meets the conditions is found, return to step S34;

[0047] S383. Calculate the load rate of the distribution line after the transfer according to the proposed switch, and save the opposite line of the located contact switch as the transfer plan;

[0048] S384. Determine whether the contact switches of the distribution lines that need to transfer the load have been positioned;

[0049] If yes, go to step S4;

[0050] If not, locate the next tie switch and return to step S33.

[0051] Furthermore, before entering step S4 in step S384, the following steps are also included:

[0052] Determine whether there is a transfer option;

[0053] If yes, go to step S4;

[0054] If not, select a combination of opposite lines where at least two tie switches are located to formulate a power transfer plan.

[0055] Furthermore, the specific steps of step S4 are as follows:

[0056] S41. The power grid dispatching and control cloud platform calculates the load rates of the distribution lines that need to transfer the load and the opposite load lines before and after the transfer in each transfer scheme;

[0057] S42. The power grid dispatching and control cloud platform prioritizes the power transfer plans according to the pre-configured power transfer plan comparison method;

[0058] S43. The power grid dispatching and control cloud platform displays the transfer plans according to the priority order, and displays the load rates of the distribution lines of the loads to be transferred and the opposite load lines before and after the transfer of each transfer plan;

[0059] S44. The power grid dispatching and control cloud platform receives the power transfer plan selected by the user, receives the user's modification of the selected power transfer plan to complete the determination of the power transfer plan, and uses the determined power transfer plan to load balance the distribution downstream.

[0060] Furthermore, the pre-configured transfer scheme comparison method in step S42 includes:

[0061] The transfer plans are compared based on the basic level of the transfer source of the opposite line. The transfer plan corresponding to the opposite line with a higher transfer source priority has a higher priority.

[0062] The transfer plans are compared based on the load margin of the opposite line, and the transfer plan corresponding to the opposite line with a higher load margin has a higher priority;

[0063] The switching plans are compared based on whether there is a preset important user mark on the opposite line, wherein the switching plan corresponding to the opposite line without the important user mark has a higher priority.

[0064] Furthermore, step S4 also includes the following steps:

[0065] S45. The power grid dispatching control cloud platform determines whether there is a corresponding amplitude angle difference between the tie switches corresponding to the opposite line in the transfer plan and whether there is a tie switch that does not allow closing of the loop;

[0066] If so, the power transfer plan is carried out in a manner of controlling separation followed by controlling combination, and the process goes to step S46;

[0067] If not, go to step S46.

[0068] In a second aspect, the present invention provides a distribution network intelligent load balancing scheduling system, comprising:

[0069] The cloud platform building module is used to build a power grid dispatching and control cloud platform and import the distribution network topology, heavy overload strategy and the maximum load rate of each line;

[0070] The module for identifying power lines that need to be transferred is used to identify the power distribution lines that need to transfer the load based on the relationship between the real-time load rate and the maximum load rate of each line on the power grid dispatching and control cloud platform when it is detected that the distribution network meets the triggering conditions of the heavy overload strategy;

[0071] The transferable supply scheme generation module is used to identify the connecting switches on the distribution lines that need to transfer loads according to the distribution network topology on the power grid dispatching control cloud platform, analyze the transfer direction corresponding to each connecting switch, determine the transferable supply scheme and the corresponding opposite line;

[0072] The transferable supply scheme display module is used to display the transferable supply scheme and the load rate changes of the distribution lines and opposite lines that need to transfer the load before and after the transfer to users on the power grid dispatching and control cloud platform, and receive the transferable supply scheme selected by the user to execute distribution line load balancing.

[0073] The beneficial effects of the present invention are:

[0074] The distribution network intelligent load balancing scheduling method and system provided by the present invention realize automatic load balancing of the distribution network through the power grid scheduling control cloud platform, reduce the erroneous operation of manual distribution network regulation, improve work efficiency, and realize the standardization and intelligence of distribution network operation management.

[0075] In addition, the invention has a reliable design principle, a simple structure and a very broad application prospect.

[0076] It can be seen that compared with the prior art, the present invention has outstanding substantive features and significant progress, and the beneficial effects of its implementation are also obvious. BRIEF DESCRIPTION OF THE DRAWINGS

[0077] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0078] Figure 1 It is a flow chart of the distribution network intelligent load balancing scheduling method of the present invention.

[0079] Figure 2 It is a schematic diagram of the distribution network intelligent load balancing scheduling system of the present invention. DETAILED DESCRIPTION

[0080] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0081] See also Figure 1 The figure shows a specific implementation of a distribution network intelligent load balancing scheduling method, including the following steps:

[0082] S1. Build a power grid dispatching and control cloud platform, and import the distribution network topology, heavy overload strategy and maximum load rate of each line into the power grid dispatching and control cloud platform;

[0083] S2. When it is detected that the distribution network meets the heavy overload strategy triggering conditions, the power grid dispatching control cloud platform identifies the distribution lines that need to transfer loads based on the relationship between the real-time load rate and the maximum load rate of each line;

[0084] S3. The power grid dispatching and control cloud platform identifies the tie switches on the distribution lines that need to transfer loads according to the distribution network topology, analyzes the transfer direction corresponding to each tie switch, determines the transfer scheme and the corresponding opposite line;

[0085] S4. The power grid dispatching and control cloud platform displays the transferable supply scheme to the user and the load rate changes of the distribution lines and the opposite lines that need to transfer the load before and after the transfer, and receives the transferable supply scheme selected by the user to execute the distribution line load balancing.

[0086] In this embodiment, the specific steps of step S1 are as follows:

[0087] S11. Build a power grid dispatching and control cloud platform;

[0088] S12. Import the distribution network topology into the power grid dispatching and control cloud platform, and represent the connection relationship of each distribution line and the position relationship of the tie switch;

[0089] S13. Import the main transformer heavy overload strategy and the single feeder heavy overload strategy into the power grid dispatching control cloud platform;

[0090] S14. Import the maximum load rate of the distribution grid into the power grid dispatching control cloud platform;

[0091] S15. The power grid dispatching control cloud platform connects the power grid sensor equipment of each distribution line to collect the real-time load rate of each line;

[0092] The specific steps of step S2 are as follows:

[0093] S21. The power grid dispatching control cloud platform determines whether it has received a manually triggered dynamic load balancing and network reconstruction request;

[0094] If yes, go to step S22;

[0095] If not, proceed to step S23;

[0096] S22. The power grid dispatching control cloud platform receives the manually input load value that needs to be reduced, searches for each distribution line that needs to transfer the load according to the main transformer heavy overload strategy, and proceeds to step S3;

[0097] S23. The power grid dispatching and control cloud platform detects each line of the distribution network, identifies the distribution lines whose real-time load rate is greater than the maximum load rate according to the single feeder heavy overload strategy, and uses them as the distribution lines that need to transfer load;

[0098] The specific steps of step S3 are as follows:

[0099] S31. The power grid dispatching and control cloud platform identifies the interconnection switches of the distribution lines that need to transfer the load and the opposite lines of each interconnection switch according to the distribution topology;

[0100] S32. Position a contact switch;

[0101] S33. Obtain the opposite load corresponding to the located contact switch, and calculate whether the opposite load rate is greater than the maximum load rate;

[0102] If yes, go to step S35;

[0103] If not, proceed to step S34;

[0104] S34. Determine whether the contact switches of the distribution lines that need to transfer the load are positioned;

[0105] If yes, go to step S35;

[0106] If not, locate the next tie switch and return to step S33;

[0107] S35. The power grid dispatching control cloud platform calculates the target load reduction of the distribution lines that need to transfer load;

[0108] S36. The grid dispatching control cloud platform calculates the allowable transfer capacity of the opposite line of the tie switch located;

[0109] S37. Determine whether the allowed transfer amount is greater than the target load reduction amount;

[0110] If yes, go to step S38;

[0111] If not, return to step S34;

[0112] S38. Search the switch to be divided according to the preset rules on the opposite side of the located tie switch, calculate the load rate of the distribution line after the transfer and save the opposite side line as the transfer plan;

[0113] The specific steps of step S4 are as follows:

[0114] S41. The power grid dispatching and control cloud platform calculates the load rates of the distribution lines that need to transfer the load and the opposite load lines before and after the transfer in each transfer scheme;

[0115] S42. The power grid dispatching and control cloud platform prioritizes the power transfer plans according to the pre-configured power transfer plan comparison method;

[0116] S43. The power grid dispatching and control cloud platform displays the transfer plans according to the priority order, and displays the load rates of the distribution lines of the loads to be transferred and the opposite load lines before and after the transfer of each transfer plan;

[0117] S44. The power grid dispatching and control cloud platform receives the power transfer plan selected by the user, receives the user's modification of the selected power transfer plan to complete the determination of the power transfer plan, and uses the determined power transfer plan to load balance the distribution downstream.

[0118] In some embodiments, step S35 includes the following steps:

[0119] S351. The power grid dispatching control cloud platform calculates the real-time load rate of the distribution line to be transferred, and calculates the first load amount to be reduced based on the maximum load rate as the threshold, so that the real-time load rate is reduced to the maximum load rate;

[0120] S352. The power grid dispatching control cloud platform calculates the average load rate of the distribution network and the real-time load rate of the distribution line to be transferred, and uses the average load rate as a threshold to calculate the second load amount that needs to be reduced, so that the real-time load rate is reduced to the average load rate;

[0121] S353. The power grid dispatching and control cloud platform takes the larger median of the first load and the second load as the target load reduction amount.

[0122] In some embodiments, step S38 includes the following steps:

[0123] S381. On the opposite line of the located tie switch, search for a switch with a load reduction greater than the target load reduction and less than the allowable transfer amount on the opposite side as a proposed split switch in the direction from the tie switch to the main grid load;

[0124] If a switch that meets the conditions is found, the process goes to step S383;

[0125] If no switch that meets the conditions is found, the process goes to step S382;

[0126] S382. On the opposite side of the located tie switch, search for a switch with a smaller transfer capacity than the opposite side in the direction from the main grid load to the tie switch as a proposed split switch;

[0127] If a switch that meets the conditions is found, the process goes to step S383;

[0128] If no switch that meets the conditions is found, return to step S34;

[0129] S383. Calculate the load rate of the distribution line after the transfer according to the proposed switch, and save the opposite line of the located contact switch as the transfer plan;

[0130] S384. Determine whether the contact switches of the distribution lines that need to transfer the load have been positioned;

[0131] If yes, go to step S4;

[0132] If not, locate the next tie switch and return to step S33.

[0133] In some embodiments, the pre-configured transfer scheme comparison method in step S42 includes:

[0134] The transfer plans are compared based on the basic level of the transfer source of the opposite line. The transfer plan corresponding to the opposite line with a higher transfer source priority has a higher priority.

[0135] The transfer plans are compared based on the load margin of the opposite line, and the transfer plan corresponding to the opposite line with a higher load margin has a higher priority;

[0136] The switching plans are compared based on whether there is a preset important user mark on the opposite line, wherein the switching plan corresponding to the opposite line without the important user mark has a higher priority.

[0137] In some embodiments, step S4 further includes the following steps:

[0138] S45. The power grid dispatching control cloud platform determines whether there is a corresponding amplitude angle difference between the tie switches corresponding to the opposite line in the transfer plan and whether there is a tie switch that does not allow closing of the loop;

[0139] If so, the power transfer plan is carried out in a manner of controlling separation followed by controlling combination, and the process goes to step S46;

[0140] If not, go to step S46.

[0141] It should be understood that the order of execution of the steps in the above embodiment does not mean that the execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiment of the present invention.

[0142] The following is an embodiment of the distribution network intelligent load balancing scheduling system provided by the embodiments of the present disclosure. The system and the distribution network intelligent load balancing scheduling method of the above-mentioned embodiments belong to the same inventive concept. For details not described in detail in the embodiments of the distribution network intelligent load balancing scheduling system, please refer to the embodiments of the above-mentioned distribution network intelligent load balancing scheduling method.

[0143] like Figure 2 As shown, the system includes:

[0144] The cloud platform building module is used to build a power grid dispatching and control cloud platform and import the distribution network topology, heavy overload strategy and the maximum load rate of each line;

[0145] The module for identifying power lines that need to be transferred is used to identify the power distribution lines that need to transfer the load based on the relationship between the real-time load rate and the maximum load rate of each line on the power grid dispatching and control cloud platform when it is detected that the distribution network meets the triggering conditions of the heavy overload strategy;

[0146] The transferable supply scheme generation module is used to identify the connecting switches on the distribution lines that need to transfer loads according to the distribution network topology on the power grid dispatching control cloud platform, analyze the transfer direction corresponding to each connecting switch, determine the transferable supply scheme and the corresponding opposite line;

[0147] The transferable supply scheme display module is used to display the transferable supply scheme and the load rate changes of the distribution lines and opposite lines that need to transfer the load before and after the transfer to users on the power grid dispatching and control cloud platform, and receive the transferable supply scheme selected by the user to execute distribution line load balancing.

[0148] Although the present invention has been described in detail by referring to the accompanying drawings and in combination with the preferred embodiments, the present invention is not limited thereto. Without departing from the spirit and essence of the present invention, a person skilled in the art may make various equivalent modifications or substitutions to the embodiments of the present invention, and these modifications or substitutions shall be within the scope of the present invention. Any person skilled in the art who is familiar with the present technical field can easily think of changes or substitutions within the technical scope disclosed by the present invention, and they shall be within the scope of protection of the present invention.

Claims

1. A distribution network intelligent load balancing scheduling method, characterized in that: The steps include: S1. Build a power grid dispatching and control cloud platform, and import the distribution network topology, heavy overload strategy and maximum load rate of each line into the power grid dispatching and control cloud platform; S2. When it is detected that the distribution network meets the heavy overload strategy triggering conditions, the power grid dispatching control cloud platform identifies the distribution lines that need to transfer loads based on the relationship between the real-time load rate and the maximum load rate of each line; S3. The power grid dispatching and control cloud platform identifies the tie switches on the distribution lines that need to transfer loads according to the distribution network topology, analyzes the transfer direction corresponding to each tie switch, determines the transfer scheme and the corresponding opposite line; S4. The power grid dispatching and control cloud platform displays the transferable supply scheme to the user and the load rate changes of the distribution lines and the opposite lines that need to transfer the load before and after the transfer, and receives the transferable supply scheme selected by the user to execute the distribution line load balancing.

2. The distribution network intelligent load balancing scheduling method according to claim 1, characterized in that: The specific steps of step S1 are as follows: S11. Build a power grid dispatching and control cloud platform; S12. Import the distribution network topology into the power grid dispatching and control cloud platform, and represent the connection relationship of each distribution line and the position relationship of the tie switch; S13. Import the main transformer heavy overload strategy and the single feeder heavy overload strategy into the power grid dispatching control cloud platform; S14. Import the maximum load rate of the distribution grid into the power grid dispatching control cloud platform; S15. The power grid dispatching and control cloud platform connects to the power grid sensor equipment of each distribution line to collect the real-time load rate of each line.

3. The distribution network intelligent load balancing scheduling method according to claim 2, characterized in that: The specific steps of step S2 are as follows: S21. The power grid dispatching control cloud platform determines whether it has received a manually triggered dynamic load balancing and network reconstruction request; If yes, go to step S22; If not, proceed to step S23; S22. The power grid dispatching control cloud platform receives the manually input load value that needs to be reduced, searches for each distribution line that needs to transfer the load according to the main transformer heavy overload strategy, and proceeds to step S3; S23. The power grid dispatching and control cloud platform detects each line of the distribution network, identifies the distribution lines whose real-time load rate is greater than the maximum load rate according to the single feeder heavy overload strategy, and uses them as the distribution lines that need to transfer loads.

4. The distribution network intelligent load balancing scheduling method according to claim 3, characterized in that: The specific steps of step S3 are as follows: S31. The power grid dispatching and control cloud platform identifies the interconnection switches of the distribution lines that need to transfer the load and the opposite lines of each interconnection switch according to the distribution topology; S32. Position a contact switch; S33. Obtain the opposite load corresponding to the located contact switch, and calculate whether the opposite load rate is greater than the maximum load rate; If yes, go to step S35; If not, proceed to step S34; S34. Determine whether the contact switches of the distribution lines that need to transfer the load are positioned; If yes, go to step S35; If not, locate the next tie switch and return to step S33; S35. The power grid dispatching control cloud platform calculates the target load reduction of the distribution lines that need to transfer load; S36. The grid dispatching control cloud platform calculates the allowable transfer capacity of the opposite line of the tie switch located; S37. Determine whether the allowed transfer amount is greater than the target load reduction amount; If yes, go to step S38; If not, return to step S34; S38. Search for the switch to be divided according to preset rules on the opposite side line of the located tie switch, calculate the load rate of the distribution line after the transfer and save the opposite side line as the transfer plan.

5. The distribution network intelligent load balancing scheduling method according to claim 4, characterized in that: The specific steps of step S35 are as follows: S351. The power grid dispatching control cloud platform calculates the real-time load rate of the distribution line to be transferred, and calculates the first load amount to be reduced based on the maximum load rate as the threshold, so that the real-time load rate is reduced to the maximum load rate; S352. The power grid dispatching control cloud platform calculates the average load rate of the distribution network and the real-time load rate of the distribution line to be transferred, and uses the average load rate as a threshold to calculate the second load amount that needs to be reduced, so that the real-time load rate is reduced to the average load rate; S353. The power grid dispatching and control cloud platform takes the larger median of the first load and the second load as the target load reduction amount.

6. The distribution network intelligent load balancing scheduling method according to claim 4, characterized in that: The specific steps of step S38 are as follows: S381. On the opposite side of the located tie switch, search for a switch with a load reduction greater than the target load reduction and less than the allowable transfer amount on the opposite side as a proposed split switch in the direction from the tie switch to the main grid load; If a switch that meets the conditions is found, the process goes to step S383; If no switch that meets the conditions is found, the process goes to step S382; S382. On the opposite side of the located tie switch, search for a switch with a smaller transfer capacity than the opposite side in the direction from the main grid load to the tie switch as a proposed split switch; If a switch that meets the conditions is found, the process goes to step S383; If no switch that meets the conditions is found, return to step S34; S383. Calculate the load rate of the distribution line after the transfer according to the proposed switch, and save the opposite line of the located contact switch as the transfer plan; S384. Determine whether the contact switches of the distribution lines that need to transfer the load have been positioned; If yes, go to step S4; If not, locate the next tie switch and return to step S33.

7. The distribution network intelligent load balancing scheduling method according to claim 4, characterized in that: The specific steps of step S4 are as follows: S41. The power grid dispatching and control cloud platform calculates the load rate of the distribution lines that need to transfer the load and the opposite load lines before and after the transfer in each transfer scheme; S42. The power grid dispatching control cloud platform prioritizes the power transfer plans according to the pre-configured power transfer plan comparison method; S43. The power grid dispatching and control cloud platform displays the transfer plans according to the priority order, and displays the load rates of the distribution lines of the loads to be transferred and the opposite load lines before and after the transfer of each transfer plan; S44. The power grid dispatching and control cloud platform receives the power transfer plan selected by the user, receives the user's modification of the selected power transfer plan to complete the determination of the power transfer plan, and uses the determined power transfer plan to load balance the distribution downstream.

8. The distribution network intelligent load balancing scheduling method according to claim 7, characterized in that: The pre-configured transfer scheme comparison method in step S42 includes: The transfer plans are compared based on the basic level of the transfer source of the opposite line. The transfer plan corresponding to the opposite line with a higher transfer source priority has a higher priority. The transfer plans are compared based on the load margin of the opposite line, and the transfer plan corresponding to the opposite line with a higher load margin has a higher priority; The switching plans are compared based on whether there is a preset important user mark on the opposite line, wherein the switching plan corresponding to the opposite line without the important user mark has a higher priority.

9. The distribution network intelligent load balancing scheduling method according to claim 7, characterized in that: Step S4 also includes the following steps: S45. The power grid dispatching control cloud platform determines whether there is a corresponding amplitude angle difference between the tie switches corresponding to the opposite line in the transfer plan and whether there is a tie switch that does not allow closing of the loop; If so, the power transfer plan is carried out in a manner of controlling separation followed by controlling combination, and the process goes to step S46; If not, go to step S46.

10. A distribution network intelligent load balancing dispatching system, characterized in that: include: The cloud platform building module is used to build a power grid dispatching and control cloud platform and import the distribution network topology, heavy overload strategy and the maximum load rate of each line; The module for identifying power lines that need to be transferred is used to identify the power distribution lines that need to be transferred based on the relationship between the real-time load rate and the maximum load rate of each line on the power grid dispatching and control cloud platform when it is detected that the distribution network meets the triggering conditions of the heavy overload strategy; The transferable supply scheme generation module is used to identify the connecting switches on the distribution lines that need to transfer loads according to the distribution network topology on the power grid dispatching control cloud platform, analyze the transfer direction corresponding to each connecting switch, determine the transferable supply scheme and the corresponding opposite line; The transferable supply scheme display module is used to display the transferable supply scheme and the load rate changes of the distribution lines and the opposite lines that need to transfer the load before and after the transfer to users on the power grid dispatching and control cloud platform, and receive the transferable supply scheme selected by the user to execute the distribution line load balancing.

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