A medium and low voltage distribution network power management system and method based on flexible interconnection of substations

Abstract

The present invention specifically relates to a medium and low voltage distribution network power management system and method based on flexible interconnection of substations, including: two flexible interactive devices, two edge-to-edge communication units, two substation intelligent fusion terminals, a cloud master station and a dispatching control system; the two flexible interactive devices are connected via a DC bus, the two flexible interactive devices are each connected to a substation intelligent fusion terminal, the two edge-to-edge communication units are connected to each other for information exchange, the two substation intelligent fusion terminals exchange information through their respective connected edge-to-edge communication units, the cloud master station is respectively connected to the two substation intelligent fusion terminals through a communication link, and the dispatching control system is connected to the cloud master station. The present invention realizes an overall solution to the goal of "device fault handling-substation power mutual assistance-medium voltage optimization regulation", and solves a full set of requirements from transient fault handling of flexible interactive devices to hierarchical and graded steady-state optimization regulation of medium and low voltage distribution networks.

Description

Technical Field

[0001] The present invention belongs to the technical field of medium and low voltage distribution networks / AC / DC hybrid distribution networks, and specifically relates to a medium and low voltage distribution network power management system and method based on flexible interconnection of substations. Background Art

[0002] With the development of new energy, the improvement of national economic level and electricity demand, it is necessary to deepen the reform of the power system and accelerate the construction of a new power system that is clean, low-carbon, safe, sufficient, economical, efficient, coordinated in supply and demand, flexible and intelligent. For low-voltage distribution networks, they are facing a large number of new sources and loads with strong randomness, such as distributed power sources and charging piles. On the one hand, this increases power uncertainty and the risk of overload in the substation; on the other hand, it also promotes the use of new energy and the supply of new loads, and injects new available resources into the optimization management and regulation of distribution networks. With the continuous development of power electronics technology, utilizing the natural complementary characteristics of power between substations and flexibly interconnecting different substations through flexible interactive devices has become an effective solution to this problem.

[0003] The patent with application number CN202110591102.5 provides a multi-station flexible interconnection control method and system based on the intelligent fusion terminal of the substation. The patent determines the power dispatching instruction of the flexible interconnection of the substation according to the transformer capacity, the optimal operating point of the transformer, the output power of the transformer, the capacity of the substation interconnection device, the active power of the source-load-storage device and the capacity of the source-load-storage device of each substation, with the goal of minimizing the difference in load rates of different substations or matching the optimal operating points of transformers in different substations. The main purpose of the low-voltage substation flexible interconnection power mutual assistance is to solve the problem of the economic operation of the low-voltage substation transformer by controlling the source-load-storage power interaction connected to the DC link of the low-voltage substation and the flexible interactive device. However, the algorithm in the distribution network master station management system in the patent is actually only based on the distribution transformer data uploaded by the fusion terminal of each substation participating in the flexible interconnection to perform low-voltage level optimization calculation. On the one hand, it does not support the working condition of controlling the power to be sent back to the medium voltage through the distribution transformer, and on the other hand, it fails to combine other electrical quantity information at the medium voltage level for calculation, so it is impossible to achieve the overall optimization of the medium and low voltage distribution network. Furthermore, this patent only uses flexible interconnection of substations to solve the problem of safe and economical operation of low-voltage substation distribution transformers, which limits its ability to optimize medium-voltage lines.

[0004] The patent with application number CN202311534063.0 provides a method and system for coordinated control of energy management applicable to medium and low voltage distribution networks. The patent mainly reconstructs the medium and low voltage intelligent distribution system in real time based on the status of each network topology and device, so as to realize its coordinated operation. However, in the coordinated control of medium and low voltage distribution networks containing flexible interactive devices (or similar devices such as flexible multi-state intelligent soft switches), no effective solution measures are taken for the failure of the DC line at the device outlet. Therefore, in the case of a device outlet failure, the device is often required to shut down for safety reasons, resulting in a decrease in the reliability of the DC port; at the same time, the upper-level control algorithm is also unable to perceive the device failure, and still takes the shut-down device into consideration for control scheduling, so that the calculation results are inconsistent with the actual network dispatchable device situation, resulting in a deviation between the dispatchable objects included in the optimization algorithm and the dispatchable devices in the actual system, affecting the coordinated control; on the other hand, due to the need for direct shutdown, it is impossible to identify and accurately remove the faulty branch, and the DC power supply reliability cannot be guaranteed.

[0005] The patent with application number CN202211567009.1 provides a flexible interactive device, system and method for AC and DC in a substation, and its power control signal optimization algorithms are all written into the cloud master station for execution. At present, the optimization algorithms for power control signals of flexible interconnection in the substation exist in the cloud master station, but in fact, the information in the intelligent fusion terminal of the flexible interconnection substation is sufficient for the optimization calculation of power transmission in the low-voltage substation. With the improvement of the edge computing capability of the intelligent fusion terminal and the development of edge-to-edge communication technology, when the medium-voltage level does not need to call the flexible interconnection of the substation to participate in the optimization, the scheme uploaded to the cloud master station will increase the communication link, increase the communication delay, affect the control accuracy, and bring a burden to the already tight computing power in the cloud master station. Especially in the current situation where the fusion terminal data is uploaded to the cloud master station at a frequency of once every 15 minutes, relying on this method for control will bring about a large control deviation and seriously reduce the control accuracy. Summary of the invention

[0006] In order to overcome the problems existing in the above-mentioned related technologies, the present application provides a medium and low voltage distribution network power management system and method based on flexible interconnection of substations.

[0007] According to a first aspect of an embodiment of the present application, a medium and low voltage distribution network power management system based on flexible interconnection of substations is provided, comprising: a primary device and a secondary device; the primary device comprises: two flexible interactive devices; the secondary device comprises: two edge-to-edge communication units, two substation intelligent fusion terminals, a cloud master station and a dispatching control system;

[0008] The two flexible interactive devices are connected via a DC bus, each of the two flexible interactive devices is connected to one of the substation intelligent fusion terminals, the two edge-to-edge communication units are connected to each other for information exchange, the two substation intelligent fusion terminals exchange information via the edge-to-edge communication units connected to them respectively, the cloud master station is connected to the two substation intelligent fusion terminals respectively via a communication link, and the dispatching control system is connected to the cloud master station;

[0009] The flexible interactive device is used to perform local fault processing according to the collected DC outlet voltage value and DC outlet current value, and execute the received first power control instruction;

[0010] The intelligent fusion terminal of the substation area is used to generate a first power control instruction when the substation area flexible interconnection needs to be called for optimization, and send the first power control instruction to the flexible interaction device corresponding thereto; and execute the received second power control instruction corresponding thereto;

[0011] The cloud master station is used to generate a second power control instruction corresponding to each of the dispatching control system and the two substation intelligent fusion terminals when the medium-voltage layer of the distribution network needs to perform substation power mutual assistance by calling a flexible interactive device, and send it to the dispatching control system and the two substation intelligent fusion terminals;

[0012] The scheduling and control system is used to execute the received corresponding second power control instruction.

[0013] Preferably, the primary equipment further includes: two distribution transformers in two substations, two loads in two substations, a plurality of new source loads and at least one medium voltage substation;

[0014] The two substation loads are each connected to one of the flexible interactive devices, and a substation distribution transformer is each connected between the substation load and the flexible interactive device. The two substation distribution transformers are respectively connected to the medium-voltage substation, and each of the new source loads is connected to the DC bus, and each of the new source loads is respectively connected to the two edge-to-edge communication units.

[0015] Preferably, a circuit breaker is provided between the novel source load and the DC bus.

[0016] Preferably, the secondary equipment further comprises: the communication link, the communication link comprises: a business middle station real-time measurement center and a property management platform;

[0017] The cloud master station, the business middle station real-time measurement center and the property management platform are connected in sequence, and the property management platform is connected to the two station area intelligent fusion terminals respectively.

[0018] Preferably, when the number of the medium-voltage substation is one, the two distribution transformers in the substation area are respectively connected to different medium-voltage outgoing lines of the medium-voltage substation, or the two distribution transformers in the substation area are respectively connected to different branches of the same medium-voltage outgoing line of the medium-voltage substation, or the two distribution transformers in the substation area are respectively connected to different nodes of the same branch of the same medium-voltage outgoing line of the medium-voltage substation;

[0019] When the number of the medium-voltage substations is two, the two distribution transformers in the substation area are each connected to one of the medium-voltage substations.

[0020] According to a second aspect of an embodiment of the present application, a medium and low voltage distribution network power management method based on flexible interconnection of substations is provided, comprising:

[0021] Using the flexible interactive device to perform local fault processing according to the collected DC outlet voltage value and DC outlet current value, and to execute the received first power control instruction;

[0022] When the flexible interconnection of the substation area needs to be called for optimization, a first power control instruction is generated by using the substation area intelligent fusion terminal, and the first power control instruction is sent to the corresponding flexible interaction device;

[0023] When the medium-voltage layer of the distribution network needs to perform power mutual assistance between the substations by calling the flexible interactive device, the cloud master station generates the second power control instructions corresponding to the dispatching control system and the two substation intelligent fusion terminals, and sends them to the dispatching control system and the two substation intelligent fusion terminals;

[0024] Utilizing the scheduling control system to execute the received corresponding second power control instruction;

[0025] The two area intelligent fusion terminals are used to execute the received second power control instructions corresponding to each other.

[0026] Preferably, the flexible interactive device is used to perform local fault processing according to the collected DC outlet voltage value and DC outlet current value, including:

[0027] According to the DC outlet voltage value and the DC outlet current value, it is judged whether there is a short circuit fault in the DC bus; if there is a short circuit fault, the flexible interactive device changes from the constant voltage / constant power mode to the current limiting mode output, and all the current flows to the fault branch, and it is judged whether the circuit breaker of the fault branch is successfully disconnected; otherwise, the flexible interactive device restores or maintains the original working mode;

[0028] If the faulty branch circuit breaker is successfully opened, the flexible interactive device resumes or maintains the original working mode, and the fault flag position of the flexible interactive device is 0; otherwise, the fault flag position of the flexible interactive device is 1, and the information that the fault flag position is 1 is uploaded to the cloud master station through its corresponding substation intelligent fusion terminal, and the flexible interactive device is shut down.

[0029] Preferably, the determining whether there is a short circuit fault on the DC bus includes:

[0030] Determine whether a voltage sudden drop occurs according to the DC outlet voltage value, and determine whether a current sudden increase occurs according to the DC outlet current value;

[0031] If a sudden voltage drop and a sudden current increase occur, a short circuit fault occurs in the DC bus; otherwise, no short circuit fault occurs in the DC bus.

[0032] Preferably, the step of generating the first power control instruction by using the station area intelligent fusion terminal includes:

[0033] Confirm whether the parameter adjustment flag bit issued by the cloud master station is 0. If the parameter adjustment flag bit is 0, data communication between the two substation intelligent fusion terminals is performed through the corresponding edge-to-edge communication unit, and the first constraint condition is constrained to optimize the comprehensive operating efficiency of the two substation distribution transformers, and optimize the calculation to obtain the first power control instruction;

[0034] If the parameter adjustment flag is 1, the target power control instruction received from the cloud master station is sent to the corresponding flexible interactive device, so that the flexible interactive device executes the target power control instruction.

[0035] Preferably, the calculation formula of the first constraint condition includes:

[0036]

[0037] In the above formula, P T1 is the power flowing through a distribution transformer in a substation, P T2 is the power flowing through another distribution transformer in the substation area, P C1 is the power flowing through a flexible interactive device, P C2 is the power flowing through another flexible interactive device, is the equivalent load of all new sources and loads, P L1 is the load of a station area, P L2 The load for another area.

[0038] Preferably, the method of using the cloud master station to generate the second power control instructions corresponding to the dispatching control system and the two substation intelligent fusion terminals respectively includes:

[0039] Receive the power information of the medium-voltage level of the distribution network sent by the dispatching and control system, and determine whether the power information of the medium-voltage level of the distribution network meets the preset conditions. If the power information of the medium-voltage level of the distribution network meets the preset conditions, set the parameter adjustment flag position of the cloud master station to 0;

[0040] If the power information of the medium-voltage layer of the distribution network does not meet the preset conditions, the fault flag of the flexible interactive device is judged. When the fault flag of the flexible interactive device is 0, the parameter adjustment flag of the cloud master station is set to 1, and the optimization efficiency of the medium-voltage layer of the distribution network is optimized as the goal, and the second constraint condition and the preset medium-voltage layer constraint condition are used as constraints. An optimization calculation for the global medium-voltage of the distribution network is performed to obtain the second power control instructions corresponding to the dispatching control system and the two substation intelligent fusion terminals respectively; when the fault flag of the flexible interactive device is not 0, an alarm prompts that other means other than calling the substation flexible interconnection should be adopted to optimize the medium voltage.

[0041] Preferably, the calculation formula of the second constraint condition includes:

[0042]

[0043] In the above formula, P T1 is the power flowing through a distribution transformer in a substation, P T2 is the power flowing through another distribution transformer in the substation area, P NT1 is the rated power of a distribution transformer in a substation area, P NT2 The rated power of another distribution transformer in the substation area. P C1 is the power flowing through a flexible interactive device, P C2 is the power flowing through another flexible interactive device, is the equivalent load of all new sources and loads, P L1 is the load of a station area, P L2 The load for another area.

[0044] According to a third aspect of an embodiment of the present application, there is provided an electronic device, comprising: at least one processor and a memory; the memory and the processor are connected via a bus;

[0045] The memory is used to store one or more programs;

[0046] When the one or more programs are executed by the at least one processor, the medium and low voltage distribution network power management method based on flexible interconnection of substations is implemented.

[0047] According to a fourth aspect of an embodiment of the present application, a readable storage medium is provided, on which an execution program is stored. When the execution program is executed, the medium and low voltage distribution network power management method based on flexible interconnection of substations is implemented.

[0048] The technical solution provided by the present invention has the following beneficial effects:

[0049] The present invention provides a medium- and low-voltage distribution network power management system and method based on flexible interconnection of substations. A flexible interactive device is used to perform local fault processing according to the collected DC export voltage value and DC export current value, thereby greatly improving the fault processing speed. When the flexible interconnection of substations needs to be called for optimization, a first power control instruction is generated by the substation intelligent fusion terminal, and the first power control instruction is sent to the corresponding flexible interactive device for execution, so that the low-voltage level power management does not need to go through a lengthy communication link, the communication delay is reduced, the control accuracy is improved, and the burden on the cloud master function is reduced. When the medium-voltage level of the distribution network needs to perform substation power mutual assistance by calling the flexible interactive device, a second power control instruction corresponding to each of the dispatching control system and the two substation intelligent fusion terminals is generated by the cloud master, and the second power control instruction is sent to the dispatching control system and the two substation intelligent fusion terminals for execution, realizing an overall solution for the goal of "device fault processing-substation power mutual assistance-medium voltage optimization regulation", and integrating the solution to the full set of requirements from transient fault processing of the flexible interactive device to hierarchical and graded steady-state optimization regulation of the medium- and low-voltage distribution network. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] 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, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0051] Figure 1 It is a structural block diagram of a medium and low voltage distribution network power management system based on flexible interconnection of substations provided by an embodiment of the present invention;

[0052] Figure 2 It is a structural block diagram of a medium and low voltage distribution network power management system based on flexible interconnection of substations provided by an embodiment of the present invention;

[0053] Figure 3It is a flow chart of a medium and low voltage distribution network power management method based on flexible interconnection of substations provided by an embodiment of the present invention;

[0054] Figure 4 is a flowchart of handling a local fault of a flexible interactive device provided by an embodiment of the present invention;

[0055] Figure 5 It is a work flow chart of the intelligent fusion terminal of the substation area provided by the embodiment of the present invention;

[0056] Figure 6 is a workflow diagram of a cloud master station provided by an embodiment of the present invention;

[0057] Figure 7 It is a structural block diagram of an electronic device provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0058] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the following embodiments are part of the embodiments of the present invention, rather than 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 are within the scope of protection of the present invention.

[0059] Embodiment 1

[0060] The present invention provides a medium and low voltage distribution network power management system based on flexible interconnection of substations. The system is based on flexible interconnection of substations, such as Figure 1 As shown, it includes: primary equipment and secondary equipment; the primary equipment includes: two flexible interactive devices; the secondary equipment includes: two edge-to-edge communication units, two area intelligent fusion terminals, a cloud master station and a dispatching control system;

[0061] Two flexible interactive devices are connected through a DC bus, each of the two flexible interactive devices is connected to a substation intelligent fusion terminal, two edge-to-edge communication units are connected to each other for information exchange, the two substation intelligent fusion terminals exchange information through their respective edge-to-edge communication units, the cloud master station is connected to the two substation intelligent fusion terminals through communication links, and the dispatching control system is connected to the cloud master station;

[0062] A flexible interactive device, used for performing local fault processing according to the collected DC outlet voltage value and DC outlet current value, and executing the received first power control instruction;

[0063] The intelligent fusion terminal of the substation area is used to generate a first power control instruction when the substation area flexible interconnection needs to be called for optimization, and send the first power control instruction to the corresponding flexible interaction device; and execute the received corresponding second power control instruction;

[0064] The cloud master station is used to generate the second power control instructions corresponding to the dispatching control system and the two intelligent fusion terminals of the substations when the medium-voltage layer of the distribution network needs to perform power mutual assistance of the substations by calling the flexible interactive device, and send them to the dispatching control system and the two intelligent fusion terminals of the substations;

[0065] The scheduling and control system is used to execute the received corresponding second power control instruction.

[0066] Combining the current medium and low voltage distribution network acquisition and control architecture of "integrated terminal-property management platform-business middle platform real-time measurement center-provincial distribution from IV zone cloud master station" and "medium voltage FTU / DTU-distribution / county / provincial dispatching control system-provincial distribution from IV zone cloud master station", such as Figure 2 As shown, in some embodiments, the cloud master station can be but is not limited to a provincial-level distributed self-IV zone cloud master station, and the dispatching and control system can be but is not limited to a distributed / county / provincial-level dispatching and control system.

[0067] The edge-to-edge communication unit provided by the present invention realizes information interaction with the area fusion terminal where the unit is located and information interaction between the "edge-to-edge" communication units of the area intelligent fusion terminal connected to the flexible interconnection.

[0068] Furthermore, the primary equipment also includes: two area distribution transformers, two area loads, multiple new source loads and at least one medium voltage substation;

[0069] The two substation loads are each connected to a flexible interactive device, a substation distribution transformer is each connected between the substation load and the flexible interactive device, the two substation distribution transformers are respectively connected to the medium-voltage substation, each new source load is connected to the DC bus, and each new source load is respectively connected to two edge-to-edge communication units.

[0070] In some embodiments, Figure 2 As shown, the new source load may include but is not limited to: photovoltaic system, energy storage system and charging pile.

[0071] Furthermore, a circuit breaker is provided between the new source load and the DC bus.

[0072] Furthermore, the secondary equipment also includes: a communication link, the communication link includes: a business middle station real-time measurement center and a property management platform;

[0073] The cloud master station, the business middle station real-time measurement center and the property management platform are connected in sequence, and the property management platform is connected to the two area intelligent fusion terminals respectively.

[0074] In some embodiments, the communication link between the substation intelligent fusion terminal and the cloud master station can be changed to other communication links as the power grid communication architecture is upgraded.

[0075] Further, when the number of medium-voltage substations is one, the two distribution transformers in the substation area are respectively connected to different medium-voltage outgoing lines of the medium-voltage substation, or the two distribution transformers in the substation area are respectively connected to different branches of the same medium-voltage outgoing line of the medium-voltage substation, or the two distribution transformers in the substation area are respectively connected to different nodes of the same branch of the same medium-voltage outgoing line of the medium-voltage substation;

[0076] When there are two medium-voltage substations, each of the two distribution transformers in the substation area is connected to a medium-voltage substation.

[0077] Among them, the connection methods between the above-mentioned substation distribution transformer and the medium-voltage substation can change the flow to support the optimization of the medium-voltage level.

[0078] The present invention provides a medium- and low-voltage distribution network power management system based on flexible interconnection of substations. The flexible interactive device performs local fault processing according to the collected DC export voltage value and DC export current value, thereby greatly improving the fault processing speed. When the flexible interconnection of the substation needs to be called for optimization, a first power control instruction is generated by the substation intelligent fusion terminal, and the first power control instruction is sent to the corresponding flexible interactive device for execution, so that the low-voltage level power management does not need to go through a lengthy communication link, the communication delay is reduced, the control accuracy is improved, and the burden on the cloud master function is reduced. When the medium-voltage level of the distribution network needs to perform substation power mutual assistance by calling the flexible interactive device, the cloud master generates a second power control instruction corresponding to the dispatching control system and the two substation intelligent fusion terminals respectively, and sends it to the dispatching control system and the two substation intelligent fusion terminals for execution, realizing an overall solution for the goal of "device fault processing-substation power mutual assistance-medium voltage optimization regulation", and integrating the solution to the full set of requirements from transient fault processing of the flexible interactive device to hierarchical and graded steady-state optimization regulation of the medium- and low-voltage distribution network.

[0079] Embodiment 2

[0080] The present invention also provides a medium and low voltage distribution network power management method based on flexible interconnection of substations, such as Figure 3 As shown, including:

[0081] Step 101: using the flexible interactive device to perform local fault processing according to the collected DC outlet voltage value and DC outlet current value, and execute the received first power control instruction;

[0082] Step 102: when the flexible interconnection of the substation area needs to be called for optimization, a first power control instruction is generated by using the substation area intelligent fusion terminal, and the first power control instruction is sent to the corresponding flexible interaction device;

[0083] Step 103: When the medium voltage level of the distribution network needs to perform power mutual assistance between the substations by calling the flexible interactive device, the cloud master station generates a second power control instruction corresponding to the dispatching control system and the two substation intelligent fusion terminals, and sends it to the dispatching control system and the two substation intelligent fusion terminals;

[0084] Step 104: Utilize the scheduling control system to execute the received corresponding second power control instruction;

[0085] Step 105: Utilize the two area intelligent fusion terminals to execute the received second power control instructions corresponding to each other.

[0086] Furthermore, step 101 includes:

[0087] Step 1011: judging whether there is a short circuit fault in the DC bus according to the DC outlet voltage value and the DC outlet current value; if there is a short circuit fault, the flexible interactive device changes from the constant voltage / constant power mode to the current limiting mode output, and all the current flows to the fault branch, and judging whether the circuit breaker of the fault branch is successfully disconnected; otherwise, the flexible interactive device restores or maintains the original working mode;

[0088] Step 1012: If the faulty branch circuit breaker is successfully opened, the flexible interactive device resumes or maintains the original working mode, and the fault flag position of the flexible interactive device is 0; otherwise, the fault flag position of the flexible interactive device is 1, and the information that the fault flag position is 1 is uploaded to the cloud master station through its corresponding substation intelligent fusion terminal, and the flexible interactive device is shut down.

[0089] It should be noted that the method of "determining whether the faulty branch circuit breaker is successfully disconnected" involved in the embodiment of the present invention is well known to those skilled in the art, so its specific implementation method will not be described in detail. In some embodiments, the flexible interactive device can determine whether there is a fault or whether the automatic fault removal is completed based on the collected branch circuit breaker electrical quantity information and disconnection status, and there is communication between the flexible interactive device and the DC branch circuit breaker.

[0090] The present invention provides a medium- and low-voltage distribution network power management system based on flexible interconnection of substations, which uses flexible interconnection of substations to inject new regulation capabilities into medium-voltage line power optimization. The functions of the cloud master station, fusion terminal, and flexible interactive device at all levels are clear and can cooperate and work together to achieve overall power management of medium- and low-voltage distribution networks based on flexible interconnection of substations. By setting the parameter adjustment flag and relying on the edge computing capabilities of the fusion terminal and the newly added "edge-to-edge" communication unit, the control authority for mutual assistance between low-voltage substations is delegated to the terminal, shortening the control delay and reducing the burden on the cloud master station.

[0091] Further, in step 1011, determining whether there is a short circuit fault in the DC bus includes:

[0092] Determine whether a voltage sag occurs based on the DC outlet voltage value, and determine whether a current surge occurs based on the DC outlet current value;

[0093] If a sudden voltage drop and a sudden current increase occur, a short circuit fault exists in the DC bus; otherwise, a short circuit fault does not exist in the DC bus.

[0094] It should be noted that the methods of "determining whether a voltage drop occurs according to the DC outlet voltage value" and "determining whether a current surge occurs according to the DC outlet current value" involved in the embodiments of the present invention are well known to those skilled in the art, and therefore, their specific implementation methods will not be described in detail.

[0095] For example, Figure 4 As shown, the workflow of the flexible interactive device is as follows:

[0096] Step 11: The flexible interactive device monitors the DC outlet voltage value and the DC outlet current value;

[0097] Step 12: When a sudden drop in voltage and a sudden increase in current are detected, execute step 13; otherwise, execute step 14;

[0098] Step 13: It is determined that there is a short circuit fault on the DC bus, and the flexible interactive device changes from the constant voltage / constant power mode to the current limiting mode output. At this time, almost all the current flows to the fault branch. If the fault branch circuit breaker is successfully disconnected, step 14 is executed, otherwise, step 15 is executed;

[0099] Step 14: The flexible interactive device determines that there is no fault or the automatic fault removal is completed according to the collected electrical quantity information and disconnection status of each branch circuit breaker, and the flexible interactive device restores or maintains the original working mode, and the "fault flag bit" is set to "0", and the process ends;

[0100] Step 15: If it is determined that automatic fault removal is impossible, the flexible interactive device will no longer be able to serve as a regulated object for system optimization. At this time, the "fault flag" is set to "1" and uploaded to the distribution cloud master station through the fusion terminal, property management platform, and business middle station real-time measurement center for notification. The flexible interactive device is then shut down and the process ends.

[0101] It can be understood that when a short circuit fault occurs in the DC busbar at the outlet of the flexible interactive device of the present invention, the flexible interactive device can identify and cut off the fault branch by current limiting, and use the fault flag to inform the superior control unit whether the device is in a controllable state.

[0102] Further, step 102 includes:

[0103] Step 1021: confirm whether the parameter adjustment flag bit issued by the cloud master station is 0. If the parameter adjustment flag bit is 0, data communication between the two area intelligent fusion terminals is performed through the corresponding edge-to-edge communication unit, and the comprehensive operation efficiency of the two area distribution transformers is optimized as the goal and the first constraint condition is used as the constraint to perform optimization calculation to obtain the first power control instruction;

[0104] Specifically, the calculation formula of the first constraint condition includes:

[0105]

[0106] In the above formula, P T1 is the power flowing through a distribution transformer in a substation, P T2 is the power flowing through another distribution transformer in the substation area, P C1 is the power flowing through a flexible interactive device, P C2 is the power flowing through another flexible interactive device, is the equivalent load of all new sources and loads, P L1 is the load of a station area, P L2 The load of another area;

[0107] Step 1022: If the parameter adjustment flag is 1, the target power control instruction received from the cloud master station is sent to its corresponding flexible interactive device, so that the flexible interactive device executes the target power control instruction.

[0108] It should be noted that the method of "optimizing the comprehensive operating efficiency of the two substations and performing optimization calculations with the first constraint as the goal" involved in the embodiment of the present invention is well known to those skilled in the art, and therefore, its specific implementation method will not be described in detail.

[0109] In some embodiments, "the comprehensive operating efficiency of the two distribution transformers is optimal" means: the sum of the output side powers of the two distribution transformers is divided by the sum of the input side powers as the comprehensive operating efficiency, and the maximum efficiency is optimal.

[0110] For example, Figure 5 As shown in the figure, the working process of the intelligent fusion terminal in the substation area is as follows:

[0111] Step 21: The internal program of the fusion terminal confirms whether the "parameter adjustment flag" issued by the cloud master station is "0". If the "parameter adjustment flag" is "0", step 22 is executed; if the "parameter adjustment flag" is "1", step 25 is executed; wherein the "parameter adjustment flag" is a flag indicating whether the current medium voltage level needs to call the flexible interconnection of the substation for optimization;

[0112] Step 22: Initiate edge-to-edge communication between converged terminals via the edge-to-edge communication unit;

[0113] Step 23: Taking the optimal comprehensive operation efficiency of the two distribution transformers as the goal and the first constraint condition as the constraint, perform optimization calculation;

[0114] Step 24: Send the first power instruction result obtained after the optimization calculation by the intelligent fusion terminal of the substation area to the flexible interactive device for execution, and end;

[0115] Step 25: directly send the power control received from the cloud master station to the flexible interactive device for execution, and end.

[0116] It can be understood that when the medium voltage level status meets the requirements of safe and economical operation and there is no need to call the flexible interconnection of the substation for optimization, the fusion terminal is informed to delegate control by setting the parameter flag. The optimization program in the substation intelligent fusion terminal generates a power control instruction for the flexible interactive device based on the first constraint condition, and sends it to the flexible interactive device for execution.

[0117] Further, step 103 includes:

[0118] Step 1031: receiving the power information of the medium-voltage level of the distribution network sent by the dispatching control system, and determining whether the power information of the medium-voltage level of the distribution network meets the preset conditions. If the power information of the medium-voltage level of the distribution network meets the preset conditions, the parameter adjustment flag position of the cloud master station is set to 0, and the information that the parameter adjustment flag position of the cloud master station is 0 is sent to the intelligent fusion terminal of the substation area;

[0119] Step 1032: If the power information of the medium voltage level of the distribution network does not meet the preset conditions, the fault flag of the flexible interactive device is determined. When the fault flag of the flexible interactive device is 0, the parameter adjustment flag of the cloud master station is set to 1, and the optimal operation efficiency of the medium voltage level of the distribution network is taken as the goal, and the second constraint condition and the preset medium voltage level constraint condition are taken as constraints, and the optimization calculation for the overall medium voltage of the distribution network is performed to obtain the second power control instructions corresponding to the dispatching control system and the two substation intelligent fusion terminals; when the fault flag of the flexible interactive device is not 0, an alarm prompts that other means other than calling the substation flexible interconnection should be adopted to optimize the medium voltage.

[0120] Specifically, the calculation formula of the second constraint condition includes:

[0121]

[0122] In the above formula, P T1 is the power flowing through a distribution transformer in a substation, P T2 is the power flowing through another distribution transformer in the substation area, P NT1 is the rated power of a distribution transformer in a substation area, P NT2 The rated power of another distribution transformer in the substation area. P C1 is the power flowing through a flexible interactive device, P C2 is the power flowing through another flexible interactive device, is the equivalent load of all new sources and loads, P L1 is the load of a station area, P L2 The load for another area.

[0123] The present invention injects new regulation capabilities into medium-voltage line power optimization by utilizing flexible interconnection of substations, and the adjustable power range is expanded to twice the original; the present invention clarifies the functions and coordination relationships of each level of the cloud master station, fusion terminal, and flexible interactive device, and provides an overall solution for medium and low voltage distribution network power management; the present invention sets a parameter adjustment flag and relies on the terminal edge computing capability and "edge-to-edge" communication to delegate control rights only when mutual assistance between substations is carried out to the terminal, thereby halving the communication delay in this case, improving control accuracy and reducing the burden on the cloud master station.

[0124] It should be noted that the present invention does not limit the "preset conditions", which can be set by those skilled in the art according to engineering needs, test data or expert experience. In some embodiments, the preset conditions can be set according to the current safe and economical operation requirements;

[0125] The method of "taking the medium voltage level operating efficiency as the goal, taking the second constraint condition and the preset medium voltage level constraint condition as the constraint, and performing the optimization calculation for the global medium voltage of the distribution network" involved in the embodiment of the present invention is well known to those skilled in the art, and therefore, its specific implementation method will not be described in detail;

[0126] The present invention does not limit the "preset medium voltage level constraint condition", which can be set by technical personnel in this field according to engineering needs, test data or expert experience.

[0127] In some embodiments, the optimal operating efficiency of the medium voltage level means that the power of all loads connected to the medium voltage level is divided by the power of all power sources as the efficiency, and the maximum efficiency is the optimal one.

[0128] It can be understood that when the medium voltage needs to call on the flexible interconnection of the substation for optimization, the substation distribution transformer power is allowed to be reversed, and the constraint condition of the low voltage part is changed from the first constraint condition to the second constraint condition. The optimization program in the cloud master station generates the power control instruction of the flexible interactive device, which is sent to the flexible interactive device for execution through the communication link including the substation intelligent fusion terminal.

[0129] For example, Figure 6 As shown in the figure, the workflow of the cloud master is as follows:

[0130] Step 31: The internal program of the cloud master station first obtains the power information of the medium voltage level from the distribution / county / provincial dispatching control system, and determines whether the current state of the medium voltage meets the requirements of safe and economic operation based on the power information of the medium voltage level. If not, execute step 32; if yes, execute step 36;

[0131] Step 32: Read the "fault flag" of the flexible interactive device. If the "fault flag" is 0, execute step 33; otherwise, execute step 35;

[0132] Step 33: Set the "parameter adjustment flag" in the cloud master station, which indicates whether it is necessary to call the flexible interactive device to perform area power mutual assistance to achieve optimization, to "1", and perform optimization calculation for the medium voltage global system with the goal of optimizing the medium voltage level operation efficiency and the second constraint condition and the preset medium voltage level constraint condition as constraints;

[0133] Step 34: Send the second power instruction obtained after the cloud master station performs optimization calculation to the distribution / county / provincial dispatching control system and the fusion terminal, and end;

[0134] Step 35: The alarm prompts that other means other than calling the flexible interconnection of the substation area should be adopted to optimize the medium voltage regulation, and the process ends;

[0135] Step 36: Set the "parameter adjustment flag" to "0" and send it to the fusion terminal via the communication link, and then end.

[0136] Furthermore, the data for medium voltage global optimization calculations in the cloud master station comes from the medium voltage data source of the dispatching control system and the low voltage data source of the real-time measurement center of the business middle station.

[0137] In some embodiments, the data sources of the provincial distribution zone IV cloud master station when performing medium voltage level optimization may include not only the distribution / county / provincial dispatching control system and the business middle station real-time measurement center, but also other sources such as meteorological data systems.

[0138] In actual applications, the cloud master station, the intelligent fusion terminal of the substation area and the flexible interactive device are each written with programs that can meet the functions of this level. In the distribution self-cloud master station program, the low-voltage substation power information sent by the fusion terminal and the medium-voltage level feeder terminal device FTU and data transmission device DTU collected information sent by the distribution / county / provincial dispatching control system are comprehensively considered, and the power feedback of the distribution transformer in the flexible interconnected substation is supported, injecting new regulation capabilities into the medium-voltage level.

[0139] The present invention provides a method for managing power of medium and low voltage distribution networks based on flexible interconnection of substations, and provides a topology and method for injecting power regulation capability into the medium voltage level by using flexible interconnection of substations, that is, the present invention extends the existing low voltage substation flexible Internet framework to the complete topology of the medium voltage area for analysis and optimization, and allows the flexible interconnection substation distribution transformer to reverse within the rated power range when there is a need for optimization of the medium voltage, so that the low voltage substation flexible interconnection no longer only serves the energy mutual assistance between substations, but can also inject new regulation capability into the power optimization of the medium voltage line, and the adjustable power range is expanded to twice the original;

[0140] The present invention provides a medium and low voltage distribution network power management method based on flexible interconnection of substations, and provides an overall solution of "device fault handling-substation power mutual assistance-medium voltage optimization regulation" based on the power grid acquisition control architecture and flexible interconnection of substations. That is, based on the power grid acquisition control architecture, the present invention creatively designs and clarifies the functional scope and coordination relationship of the provincial distribution self-IV zone cloud master station, substation intelligent fusion terminal, and flexible interactive device at all levels in the medium and low voltage power management based on flexible interconnection of substations, and provides an overall solution that can achieve the goal of "device fault handling-substation power mutual assistance-medium voltage optimization regulation". The fault handling speed is greatly improved, and the full set of requirements from transient fault handling of flexible interactive devices to hierarchical and graded steady-state optimization regulation of medium and low voltage distribution networks are solved in an integrated manner;

[0141] The present invention provides a medium and low voltage distribution network power management system based on flexible interconnection of substations, which shortens the control delay of flexible interconnection of substations, improves control accuracy, and effectively reduces the burden on the cloud master station function of the provincial distribution area IV zone. That is, the present invention relies on the edge computing capability of the substation intelligent fusion terminal itself and the "edge-to-edge" communication capability between terminals to delegate the power mutual assistance control right between substations to the fusion terminal by setting a parameter adjustment flag, without the need for medium voltage to call the low voltage substation flexible interconnection for power optimization. Simple low voltage level power management will not require the lengthy communication link connecting the property management platform and the provincial distribution area IV zone cloud master station, so that the communication delay in this case is halved, the control accuracy is improved and the burden on the cloud master station function is reduced.

[0142] In today's medium and low voltage distribution network scenarios, there are relatively mature equipment foundations and acquisition control architectures. On this basis, the present invention can solve the power management problems of medium and low voltage distribution networks based on flexible interconnection of substations through only a small amount of on-site transformation and program integration, thereby helping the distribution network to operate efficiently and with high quality. From the perspective of specific scenarios, the present invention can be widely used in the future: 1) Due to the limited power regulation capability of the access equipment in the medium voltage level of the distribution network, it is impossible to meet the regulation requirements of the medium voltage level, and it is necessary to call low voltage flexible interconnection to achieve power optimization; 2) The medium and low voltage distribution network containing flexible interconnection of substations faces multiple requirements including device fault handling, power mutual assistance between low voltage substations, and medium voltage optimization regulation, but the control of each part is separated and each part fights independently, and effective coordination cannot be achieved; 3) The flexible interconnection of substations does not need to participate in medium voltage regulation, but only needs to perform power mutual assistance between substations, but because it needs to be calculated by the cloud master station, it leads to obvious communication delay, low control accuracy or high computing pressure of the cloud master station. In summary, the application needs of the present invention are practical, the applicable situations are diverse, and the application prospects are broad.

[0143] It can be understood that the method embodiment provided above corresponds to the system embodiment described above, and the corresponding specific contents can be referenced to each other and will not be repeated here.

[0144] It can be understood that the same or similar parts of the above embodiments can be referenced to each other, and the contents not described in detail in some embodiments can refer to the same or similar contents in other embodiments.

[0145] Embodiment 3

[0146] like Figure 7 As shown, the present invention also provides an electronic device, which may be a computer device, a single-chip device, an intelligent mobile device, etc. The electronic device in this embodiment may include a processor, a memory, a transceiver component, etc. The memory, the processor, and the transceiver component are connected via a bus; the memory may be used to store an execution program, and an exemplary execution program may include instructions; the processor is used to execute the instructions stored in the memory. The memory may also be used to store data, which may be called and / or modified when the instructions are executed.

[0147] The processor may be a central processing unit (CPU), or other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA) or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components, etc. It is the computing core and control core of the terminal, which is suitable for implementing one or more instructions, specifically suitable for loading and executing one or more instructions in a storage medium to implement corresponding method flows or corresponding functions, so as to implement the steps of a medium and low voltage distribution network power management method based on flexible interconnection of substations in the above-mentioned embodiment.

[0148] Embodiment 4

[0149] Based on the same inventive concept, the present invention also provides a readable storage medium, specifically an electronic device readable storage medium (Memory), which is a memory device in an electronic device for storing programs and data. It can be understood that the storage medium here can include both built-in storage media in electronic devices and, of course, extended storage media supported by electronic devices. The storage medium provides a storage space, which stores the operating system of the terminal. In addition, one or more instructions suitable for being loaded and executed by a processor are also stored in the storage space, and these instructions can be one or more execution programs (including program codes). It should be noted that the storage medium here can be a high-speed RAM memory or a non-volatile memory, such as at least one disk memory. The processor loads and executes one or more instructions stored in the storage medium, which can implement the steps of a medium and low voltage distribution network power management method based on flexible interconnection of substations in the above embodiment.

[0150] It will be appreciated by those skilled in the art that embodiments of the present invention may be provided as methods, systems, or computer program products. Therefore, the present invention may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Furthermore, the present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0151] The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0152] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0153] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0154] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the relevant field should understand that the specific implementation methods of the present invention can still be modified or replaced by equivalents. Any modification or equivalent replacement that does not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. A medium and low voltage distribution network power management system based on flexible interconnection of substations, characterized in that: include: primary equipment and secondary equipment; The primary equipment includes: two flexible interactive devices; the secondary equipment includes: two edge-to-edge communication units, two area intelligent fusion terminals, a cloud master station and a dispatching control system; The two flexible interactive devices are connected via a DC bus, each of the two flexible interactive devices is connected to one of the substation intelligent fusion terminals, the two edge-to-edge communication units are connected to each other for information exchange, the two substation intelligent fusion terminals exchange information via the edge-to-edge communication units connected to them respectively, the cloud master station is connected to the two substation intelligent fusion terminals respectively via a communication link, and the dispatching control system is connected to the cloud master station; The flexible interactive device is used to perform local fault processing according to the collected DC outlet voltage value and DC outlet current value, and execute the received first power control instruction; The intelligent fusion terminal of the substation area is used to generate a first power control instruction when the substation area flexible interconnection needs to be called for optimization, and send the first power control instruction to the flexible interaction device corresponding thereto; and execute the received second power control instruction corresponding thereto; The cloud master station is used to generate a second power control instruction corresponding to each of the dispatching control system and the two substation intelligent fusion terminals when the medium-voltage layer of the distribution network needs to perform substation power mutual assistance by calling a flexible interactive device, and send it to the dispatching control system and the two substation intelligent fusion terminals; The scheduling and control system is used to execute the received corresponding second power control instruction.

2. The system according to claim 1, characterized in that The primary equipment also includes: two distribution transformers in two areas, two loads in two areas, a plurality of new source loads and at least one medium voltage substation; The two substation loads are each connected to one of the flexible interactive devices, and a substation distribution transformer is each connected between the substation load and the flexible interactive device. The two substation distribution transformers are respectively connected to the medium-voltage substation, and each of the new source loads is connected to the DC bus, and each of the new source loads is respectively connected to the two edge-to-edge communication units.

3. The system according to claim 2, characterized in that A circuit breaker is provided between the novel source load and the DC bus.

4. The system according to claim 1, characterized in that The secondary equipment also includes: the communication link, the communication link includes: the business middle station real-time measurement center and the property management platform; The cloud master station, the business middle station real-time measurement center and the property management platform are connected in sequence, and the property management platform is connected to the two station area intelligent fusion terminals respectively.

5. The system according to claim 2, characterized in that When the number of the medium-voltage substation is one, the two distribution transformers in the substation area are respectively connected to different medium-voltage outgoing lines of the medium-voltage substation, or the two distribution transformers in the substation area are respectively connected to different branches of the same medium-voltage outgoing line of the medium-voltage substation, or the two distribution transformers in the substation area are respectively connected to different nodes of the same branch of the same medium-voltage outgoing line of the medium-voltage substation; When the number of the medium-voltage substations is two, the two distribution transformers in the substation area are each connected to one of the medium-voltage substations.

6. A medium and low voltage distribution network power management method based on flexible interconnection of substations, applied to the medium and low voltage distribution network power management system based on flexible interconnection of substations as described in any one of claims 1 to 5, characterized in that: include: Using the flexible interactive device to perform local fault processing according to the collected DC outlet voltage value and DC outlet current value, and to execute the received first power control instruction; When the flexible interconnection of the substation area needs to be called for optimization, a first power control instruction is generated by using the substation area intelligent fusion terminal, and the first power control instruction is sent to the corresponding flexible interaction device; When the medium-voltage layer of the distribution network needs to perform power mutual assistance between the substations by calling the flexible interactive device, the cloud master station generates the second power control instructions corresponding to the dispatching control system and the two substation intelligent fusion terminals, and sends them to the dispatching control system and the two substation intelligent fusion terminals; Utilizing the scheduling control system to execute the received corresponding second power control instruction; The two area intelligent fusion terminals are used to execute the received second power control instructions corresponding to each other.

7. The method according to claim 6, characterized in that The method of using the flexible interactive device to perform local fault processing according to the collected DC outlet voltage value and DC outlet current value includes: According to the DC outlet voltage value and the DC outlet current value, it is judged whether there is a short circuit fault in the DC bus; if there is a short circuit fault, the flexible interactive device changes from the constant voltage / constant power mode to the current limiting mode output, and all the current flows to the fault branch, and it is judged whether the circuit breaker of the fault branch is successfully disconnected; otherwise, the flexible interactive device restores or maintains the original working mode; If the faulty branch circuit breaker is successfully opened, the flexible interactive device resumes or maintains the original working mode, and the fault flag position of the flexible interactive device is 0; otherwise, the fault flag position of the flexible interactive device is 1, and the information that the fault flag position is 1 is uploaded to the cloud master station through its corresponding substation intelligent fusion terminal, and the flexible interactive device is shut down.

8. The method according to claim 7, characterized in that The determining whether the DC bus has a short circuit fault includes: Determine whether a voltage sudden drop occurs according to the DC outlet voltage value, and determine whether a current sudden increase occurs according to the DC outlet current value; If a sudden voltage drop and a sudden current increase occur, a short circuit fault occurs in the DC bus; otherwise, a short circuit fault does not occur in the DC bus.

9. The method according to claim 6, characterized in that The generating of the first power control instruction by using the area intelligent fusion terminal includes: Confirm whether the parameter adjustment flag bit issued by the cloud master station is 0. If the parameter adjustment flag bit is 0, data communication between the two substation intelligent fusion terminals is performed through the corresponding edge-to-edge communication unit, and optimization calculation is performed with the goal of optimizing the comprehensive operating efficiency of the two substation distribution transformers and the first constraint condition as a constraint to obtain the first power control instruction; If the parameter adjustment flag is 1, the target power control instruction received from the cloud master station is sent to the corresponding flexible interactive device, so that the flexible interactive device executes the target power control instruction.

10. The method according to claim 9, characterized in that The calculation formula of the first constraint condition includes: In the above formula, P T1 is the power flowing through a distribution transformer in a substation, P T2 is the power flowing through another distribution transformer in the substation area, P C1 is the power flowing through a flexible interactive device, P C2 is the power flowing through another flexible interactive device, is the equivalent load of all new sources and loads, P L1 is the load of a station area, P L2 The load for another area.

11. The method according to claim 6, characterized in that The method of using the cloud master station to generate the second power control instructions corresponding to the dispatching control system and the two substation intelligent fusion terminals respectively includes: Receive the power information of the medium-voltage level of the distribution network sent by the dispatching and control system, and determine whether the power information of the medium-voltage level of the distribution network meets the preset conditions. If the power information of the medium-voltage level of the distribution network meets the preset conditions, set the parameter adjustment flag position of the cloud master station to 0; If the power information of the medium-voltage layer of the distribution network does not meet the preset conditions, the fault flag of the flexible interactive device is judged. When the fault flag of the flexible interactive device is 0, the parameter adjustment flag of the cloud master station is set to 1, and the optimization efficiency of the medium-voltage layer of the distribution network is optimized as the goal, and the second constraint condition and the preset medium-voltage layer constraint condition are used as constraints. An optimization calculation for the global medium-voltage of the distribution network is performed to obtain the second power control instructions corresponding to the dispatching control system and the two substation intelligent fusion terminals respectively; when the fault flag of the flexible interactive device is not 0, an alarm prompts that other means other than calling the substation flexible interconnection should be adopted to optimize the medium voltage.

12. The method according to claim 11, characterized in that The calculation formula of the second constraint condition includes: In the above formula, P T1 is the power flowing through a distribution transformer in a substation, P T2 is the power flowing through another distribution transformer in the substation area, P NT1 is the rated power of a distribution transformer in a substation area, P NT2 The rated power of another distribution transformer in the substation area. P C1 is the power flowing through a flexible interactive device, P C2 is the power flowing through another flexible interactive device, is the equivalent load of all new sources and loads, P L1 is the load of a station area, P L2 The load for another area.

13. An electronic device, characterized in that: include: at least one processor and memory; The memory and the processor are connected via a bus; The memory is used to store one or more programs; When the one or more programs are executed by the at least one processor, the medium and low voltage distribution network power management method based on flexible interconnection of substations as described in any one of claims 6 to 12 is implemented.

14. A readable storage medium, characterized in that: An execution program is stored thereon, and when the execution program is executed, a medium and low voltage distribution network power management method based on flexible interconnection of substations as described in any one of claims 6 to 12 is implemented.

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