Scheduling method, system and equipment for main transformer section and medium

Abstract

The invention relates to the field of power distribution networks, and discloses a main transformer section scheduling method, system and device and a medium, and the method comprises the steps: obtaining the real-time active power of a certain main transformer; determining whether a section needs to be scheduled according to the real-time active power of the main transformer; if yes, the feeder line meeting the transfer condition in the main transformer is transferred to another main transformer corresponding to the feeder line, and the real-time active power of the main transformer continues to be obtained until it is determined that the section does not need to be dispatched. The main transformer section overload can be prevented, the safety risk is reduced, and waste caused by new energy resources is avoided.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of power distribution network, in particular to a method, system, device and medium for dispatching of main transformer section. BACKGROUND

[0002] With the promotion of the "double carbon" goal, new energy represented by distributed photovoltaic has shown explosive growth on the side of the distribution network. Especially in the eastern coastal areas, industrial parks and rural areas, the penetration rate of distributed photovoltaic has reached an unprecedented high level. The popularity of this clean energy has brought huge environmental benefits, but it has also posed a serious technical challenge: in a certain operating mode, the distribution transformer (main transformer) and its associated transmission section, which originally "top-down" power transmission, have a serious "reverse overload" phenomenon.

[0003] This overload is not the traditional peak load overload, but a "reverse flow" overload caused by the superposition of photovoltaic power generation peak and load valley, which has become one of the most prominent risks in the safe operation of the current distribution network.

[0004] In the traditional power grid, the direction of power flow is single, from high-voltage power grid to medium and low-voltage distribution network through the main transformer. Power grid planning, protection and operation control are all based on this mode. The access of high-proportion distributed photovoltaic has completely changed this mode. In periods of sufficient sunlight and low electricity demand (such as noon, holidays), distributed photovoltaic power generation may far exceed local load demand. Excess power flows reversely to the upper-level power grid through the distribution line, causing the main transformer to change from a "step-down transformer" to a "step-up transformer". However, the design capacity of the main transformer and its connected lines, circuit breakers and other equipment (collectively referred to as "section") is based on the consideration of forward power transmission, and when a large amount of photovoltaic power is reversely transmitted, its power may exceed the safe current limit of the section, causing continuous overheating of the equipment, accelerated insulation aging, and even causing safety accidents such as tripping or equipment damage. SUMMARY

[0005] The present application aims to at least solve one of the technical problems existing in the prior art. To this end, the present application proposes a method for dispatching of main transformer section, which can prevent overload of main transformer section, reduce safety risk, and avoid waste of new energy resources.

[0006] The present application also proposes a system, device and medium with the above-mentioned method for dispatching of main transformer section.

[0007] According to the method for dispatching of main transformer section according to the first aspect of the present application, the method comprises: obtaining real-time active power of a certain main transformer; determining whether the section needs to be dispatched according to the real-time active power of the main transformer; If yes, the feeder in the main transformer that meets the transfer condition is transferred to another main transformer corresponding to the feeder, and the real-time active power of the main transformer is continuously obtained until it is determined that the section does not need to be dispatched.

[0008] The method for dispatching a section of a main transformer according to an embodiment of the present application has at least the following beneficial effects: the real-time active power of a main transformer is first obtained, the load condition of the main transformer is determined according to the real-time active power, and it is determined whether the main transformer needs to be dispatched, if yes, the feeder in the main transformer that can be transferred is transferred to another main transformer until the main transformer does not need to be dispatched; the present application can divert the excess power generated by new energy to other loads during a period of sufficient new energy supply and low electricity load, prevent the section of the main transformer from being overloaded, reduce the safety risk, and avoid waste of new energy resources.

[0009] According to some embodiments of the present application, the determination of whether the section needs to be dispatched according to the real-time active power of the main transformer comprises: determining whether the ratio of the real-time active power to the rated power of the main transformer exceeds a preset power ratio, and if yes, determining that the section needs to be dispatched.

[0010] According to some embodiments of the present application, the determination of whether the section needs to be dispatched according to the real-time active power of the main transformer further comprises: determining whether the ratio of the real-time active power to the rated power of the main transformer exceeds a preset first power ratio, and if yes, issuing an alarm to remind the monitoring personnel, and continuously determining whether the ratio of the real-time active power to the rated power of the main transformer exceeds a preset second power ratio, and if yes, determining that the section needs to be dispatched; wherein the power ratio comprises the first power ratio and the second power ratio.

[0011] According to some embodiments of the present application, the transferring of the feeder in the main transformer that meets the transfer condition to another main transformer corresponding to the feeder comprises: obtaining the real-time active power of another main transformer corresponding to the feeder; predicting a predicted active power of the feeder after being transferred to another main transformer according to the real-time active power of another main transformer; determining whether the feeder meets the transfer condition according to the predicted active power.

[0012] According to some embodiments of the present application, if the ratio of the predicted active power of another main transformer to the rated power thereof exceeds a first power ratio, it is determined that the feeder meets the transfer condition.

[0013] According to some embodiments of the present application, the method further comprises: determining whether the section needs to be dispatched according to the current time point, specifically, determining whether the current time point is located in a preset peak time period, and if yes, determining that the main transformer needs to be dispatched.

[0014] According to some embodiments of the present application, if it is determined that the main transformer does not need to be dispatched, the real-time active power of the main transformer is continuously acquired after a preset time period.

[0015] According to a second aspect of the present application, a main transformer section dispatching system for implementing the main transformer section dispatching method of any one of the first aspect, comprises: at least two main transformers, a control module, and a monitoring module; The monitoring module is connected to each main transformer respectively, and is configured to acquire real-time active power of each main transformer. The control module is connected to the monitoring module, and is configured to receive the real-time active power of each main transformer sent by the monitoring module, determine whether the main transformer needs to be dispatched according to the real-time active power of each main transformer, and for each main transformer, transfer the feeder in the main transformer that meets the transfer condition to another main transformer corresponding to the feeder, and continuously acquire the real-time active power of the main transformer until it is determined that the main transformer does not need to be dispatched.

[0016] According to a third aspect of the present application, an electronic device comprises: a memory configured to store a program; a processor configured to execute the program stored in the memory, and when the processor executes the program stored in the memory, the processor is configured to execute the method of any one of the first aspect.

[0017] According to a fourth aspect of the present application, a storage medium stores computer executable instructions, and the computer executable instructions are configured to execute the method of any one of the first aspect.

[0018] Other features and advantages of the present application will be described in the following description, and some will become apparent from the description, or will be understood from the practice of the present application. The purpose and other advantages of the present application can be achieved and obtained by the structure specifically pointed out in the specification, claims and drawings. BRIEF DESCRIPTION OF DRAWINGS

[0019] The accompanying drawings are used to provide a further understanding of the technical solutions of the present application, and constitute a part of the specification, and are used to explain the technical solutions of the present application together with the embodiments of the present application, and do not constitute a limitation on the technical solutions of the present application.

[0020] Figure 1 is a flowchart of a main transformer section dispatching method provided by an embodiment of the present application; Figure 2 is a schematic diagram of a main transformer section dispatching method provided by another embodiment of the present application; Figure 3This is a schematic diagram of a scheduling method for a main transformer section provided in another embodiment of the present invention; Figure 4 This is an effect diagram of a scheduling method for a main transformer section provided in another embodiment of the present invention. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0022] It should be understood that in the description of the embodiments of the present invention, "multiple" (or "amounts") means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. If "first," "second," etc., are used in the description, they are only for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0023] like Figure 1 As shown, this embodiment of the invention provides a scheduling method for a main transformer section, including: Step S100: Obtain the real-time active power of a certain main transformer; Step S200: Determine whether a dispatch section is needed based on the real-time active power of the main transformer; If so, then execute step S300, transfer the feeder in the main transformer that meets the transfer conditions to another main transformer corresponding to the feeder, and continue to obtain the real-time active power of the main transformer until it is determined that no dispatch section is needed. If not, proceed to step S100.

[0024] This invention first obtains the real-time active power of a main transformer, determines the load status of the main transformer based on the real-time active power, and determines whether the main transformer needs to be dispatched. If so, the feeders in the main transformer that can be transferred are transferred to other main transformers until the main transformer no longer needs to be dispatched. This invention diverts the excess power generated by new energy sources to other loads during periods when there is sufficient power supply from new energy sources and the power load is low, preventing the main transformer section from being overloaded, reducing safety risks, and avoiding the waste of new energy resources.

[0025] It is easy to understand that in power plants and substations, the transformer used to transmit power to the power system or users is called the main transformer, or simply the main transformer.

[0026] In one embodiment, in step S200, determining whether a dispatch section needs to be scheduled based on the real-time active power of the main transformer includes: Determine whether the ratio of the real-time active power to the rated power of the main transformer exceeds the preset power ratio. If so, determine the section that needs to be dispatched.

[0027] In one embodiment, in step S200, determining whether a dispatch section needs to be scheduled based on the real-time active power of the main transformer further includes: Determine whether the ratio of the real-time active power to the rated power of the main transformer exceeds the preset first power ratio. If so, issue an alarm to remind the monitoring personnel. Continue to determine whether the ratio of the real-time active power to the rated power of the main transformer exceeds the preset second power ratio. If so, determine that the section needs to be dispatched. The power ratio includes the first power ratio and the second power ratio.

[0028] In one embodiment, the first power ratio is 0.8 and the second power ratio is 0.9. When the ratio of the real-time active power of the main transformer to the rated power is at the first power ratio and the second power ratio, an alarm is issued to remind the personnel, who can then determine whether to activate the dispatching function.

[0029] In one embodiment, step S300, transferring the feeder in the main transformer that meets the transfer conditions to another main transformer corresponding to the feeder includes: Obtain the real-time active power of the other main transformer corresponding to the feeder; Based on the real-time active power of the other main transformer, predict the predicted active power after the feeder is transferred to the other main transformer; Based on the predicted active power, determine whether the feeder meets the conditions for power transfer.

[0030] It should be noted that some feeders under normal circumstances have only one main power supply from station A, while some feeders have one main power supply from station A and a backup power supply from station B. This data can be stored in a database. If there are feeders with main power supply and backup power supply, then the relationship of main power supply station A: feeder: backup power supply station A is satisfied as 1:1:1.

[0031] like Figure 2 , 3 As shown, in one embodiment, step S300, transferring the feeder in the main transformer that meets the transfer conditions to another main transformer corresponding to the feeder specifically includes: Search the database sequentially for each 10kV feeder connected to the main transformer station A, and select the 10kV feeders that meet the conditions for power transfer. Let Ai be the i-th 10kV feeder that meets the conditions. Let the main transformer station B be the backup power source for Ai (the backup power source can be i=B,C,D,……,n). To avoid the B main transformer exceeding its carrying capacity after the conversion, it is necessary to calculate the estimated real-time carrying capacity of the B main transformer after the conversion method in advance, that is, to compare the estimated real-time carrying capacity of the A main transformer and the B main transformer after the conversion of feeder Ai. When the ratio of the real-time active power to the rated power of the main transformer exceeds the first power ratio, the maximum load capacity of transformer A from 11:00 to 14:00 is predicted based on the real-time load capacity of transformer A at the current moment. Starting from 11:00, a point is marked as bij in 5-minute intervals (i represents the time period, i={1,2,3,4}, j=1,2,3……,12), max(b1)=f(△Pb,k,bij), where max(b1) is the estimated maximum load capacity of transformer A from 12:00 to 13:00, f is the algorithm rule, △Pb is the difference between the two time points before and after 5 minutes, k is the coefficient assigned to the prediction, and bij is the number of superposition calculations. If b1≥100%, an early warning is immediately issued that transformer A will experience reverse power transmission exceeding the maximum load capacity due to the large amount of distributed renewable energy generation at noon, and preparations are made for manual intervention; if b2 is less than 100%, step S300 is executed to automatically alleviate the heavy overload situation of the alarm transformer.

[0032] In one embodiment, for B, the following is established: a2≤80% is the target, max(a2)=f(PiA real,Pi2 real,ai), where f is the prediction algorithm rule, max(a2) is the estimated real-time carrying capacity of power station B, PiA is the active power of feeder Ai selected from power station A at real time t, Pi2 is the real-time carrying capacity of main transformer B after the expected conversion of each feeder Ai, andai is the number of superposition calculations for feeder Ai with the conditions for transfer. For power station A, the following algorithm is established: a1≤90% is the target, and an alarm is issued when 80%≤a1<90%. The algorithm is max(a1)=f(P1real, ai), where max(a1) is the real-time carrying capacity of power station A, f is the algorithm rule, P1real is the real-time active power of power station A monitored every 15 minutes, and ai is the number of iterations for each qualified backup power station (i=B,C,D,……,n). The comparison of the effects after implementation of this invention is shown in the figure below. Figure 4 As shown, the blue curve represents the daily load curve of transformer A before optimization during the peak of distributed renewable energy generation, while the orange curve represents the daily load curve of the 10kV feeder connected to transformer A after intelligent program conversion.

[0033] In one embodiment, if the ratio of the predicted active power of another main transformer to its rated power does not exceed a first power ratio, then the feeder is determined to meet the transfer conditions.

[0034] In one embodiment, it further includes: Based on the current time point, determine whether a section needs to be scheduled. Specifically, determine whether the current time point is within the preset peak time period. If so, determine that the main transformer needs to be scheduled.

[0035] In one embodiment, the preset peak time period is 11:00-14:00.

[0036] In one embodiment, if it is determined that the main transformer does not require scheduling of the section, the real-time active power of the main transformer will continue to be acquired after a preset time period.

[0037] In one embodiment, the time period is 15 minutes, that is, the real-time active power of the main transformer is read at 15-minute intervals.

[0038] This invention also provides a scheduling system for a main transformer section, which executes the above-described scheduling method for the main transformer section, including: At least two main transformers, a control module, and a monitoring module; The monitoring module is connected to each main transformer and is used to obtain the real-time active power of each main transformer. The control module, connected to the monitoring module, receives the real-time active power of each main transformer from the monitoring module and determines whether a dispatch section is needed based on the real-time active power of each main transformer. For each main transformer, the feeder that meets the transfer conditions in that main transformer is transferred to another main transformer corresponding to that feeder, and the real-time active power of that main transformer is continued to be obtained until it is determined that no dispatch section is needed.

[0039] This invention also provides an electronic device, which includes, but is not limited to: Memory, used to store programs; The processor is used to execute programs stored in memory. When the processor executes programs stored in memory, it is used to execute the scheduling method of the main transformer section described above.

[0040] The processor and memory can be connected via a bus or other means.

[0041] Memory, as a non-transitory computer-readable storage medium, can be used to store non-transitory software programs and non-transitory computer-executable programs, such as the method described in the embodiments of the present invention. The processor implements the above method by running the non-transitory software program and instructions stored in the memory.

[0042] The memory may include a program storage area and a data storage area, wherein the program storage area may store the operating system and application programs required for at least one function; the data storage area may store data for executing the methods described above. Furthermore, the memory may include high-speed random access memory and may also include non-transitory memory, such as at least one disk storage device, flash memory device, or other non-transitory solid-state storage device. In some embodiments, the memory may optionally include memory remotely located relative to the processor, which can be connected to the processor via a network. Examples of such networks include, but are not limited to, the Internet, corporate intranets, local area networks, mobile communication networks, and combinations thereof.

[0043] The non-transitory software program and instructions required to implement the above terminal selection method are stored in memory and are executed by one or more processors.

[0044] This invention also provides a storage medium storing computer-executable instructions for performing the above-described methods.

[0045] In one embodiment, the storage medium stores computer-executable instructions that are executed by one or more control processors.

[0046] The embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs.

[0047] It will be understood by those skilled in the art that all or some of the steps and systems in the methods disclosed above can be implemented as software, firmware, hardware, and suitable combinations thereof. Some or all of the physical components can be implemented as software executed by a processor, such as a central processing unit, digital signal processor, or microprocessor, or as hardware, or as an integrated circuit, such as an application-specific integrated circuit. Such software can be distributed on a computer-readable medium, which can include computer storage media (or non-transitory media) and communication media (or transient media). As is known to those skilled in the art, the term computer storage media includes volatile and non-volatile, removable and non-removable media implemented in any method or technology for storing information (such as computer-readable instructions, data structures, program modules, or other data). Computer storage media includes, but is not limited to, RAM, ROM, EEPROM, flash memory or other memory technologies, CD-ROM, digital versatile disc (DVD) or other optical disc storage, magnetic cartridges, magnetic tape, disk storage or other magnetic storage devices, or any other medium that can be used to store desired information and is accessible to a computer. Furthermore, as is known to those skilled in the art, communication media typically include computer-readable instructions, data structures, program modules, or other data in modulated data signals such as carrier waves or other transmission mechanisms, and may include any information delivery medium.

[0048] This document describes embodiments of the invention, including preferred embodiments known to the inventors for carrying out the invention. Variations of these embodiments will become apparent to those skilled in the art upon reading the foregoing description. The inventors encourage those skilled in the art to adopt such variations as appropriate, and the inventors intend to practice embodiments of the invention in ways other than those specifically described herein. Therefore, the scope of the invention includes all modifications and equivalents of the subject matter set forth in the appended claims, as permitted by applicable law. Furthermore, the scope of the invention covers any combination of the foregoing elements in all possible variations thereof, unless otherwise indicated herein or otherwise clearly contradicted by the context.

Claims

1. A dispatching method of a main transformer section, characterized by, The method comprises: acquiring real-time active power of a main transformer; determining whether a section needs to be dispatched according to the real-time active power of the main transformer; if yes, transferring a feeder line in the main transformer that meets a transfer condition to another main transformer corresponding to the feeder line, and continuously acquiring real-time active power of the main transformer until it is determined that the section does not need to be dispatched.

2. The dispatch method of claim 1, wherein, The determining whether the section needs to be dispatched according to the real-time active power of the main transformer comprises: determining whether a ratio of the real-time active power of the main transformer to rated power exceeds a preset power ratio, and if yes, determining that the section needs to be dispatched.

3. The dispatch method of claim 2, wherein, The determining whether the section needs to be dispatched according to the real-time active power of the main transformer further comprises: determining whether the ratio of the real-time active power of the main transformer to the rated power exceeds a preset first power ratio, and if yes, issuing an alarm to remind a monitoring personnel, and continuously determining whether the ratio of the real-time active power of the main transformer to the rated power exceeds a preset second power ratio, and if yes, determining that the section needs to be dispatched; wherein the power ratio comprises the first power ratio and the second power ratio.

4. The dispatch method of claim 3, wherein, The transferring the feeder line in the main transformer that meets the transfer condition to the another main transformer corresponding to the feeder line comprises: acquiring real-time active power of the another main transformer corresponding to the feeder line; predicting predicted active power of the feeder line after being transferred to the another main transformer according to the real-time active power of the another main transformer; determining whether the feeder line meets the transfer condition according to the predicted active power.

5. The method of claim 4, wherein, If a ratio of the predicted active power of the another main transformer to rated power thereof exceeds the first power ratio, it is determined that the feeder line meets the transfer condition.

6. The method of claim 2, wherein, The method further comprises: determining whether the section needs to be dispatched according to a current time point, specifically, determining whether the current time point is located in a preset peak time period, and if yes, determining that the main transformer needs to dispatch the section.

7. The method of claim 1, wherein, If it is determined that the main transformer does not need to dispatch the section, the real-time active power of the main transformer is continuously acquired after a preset time period.

8. A dispatch system for a main transformer section, characterized by The method is executed by a device, and the device comprises: at least two main transformers, a control module, and a monitoring module; the monitoring module is connected to each main transformer and is configured to acquire real-time active power of each main transformer; the control module is connected to the monitoring module and is configured to receive the real-time active power of each main transformer sent by the monitoring module, determine whether a section needs to be dispatched according to the real-time active power of each main transformer, and for each main transformer, transfer a feeder line in the main transformer that meets a transfer condition to another main transformer corresponding to the feeder line, and continuously acquire real-time active power of the main transformer until it is determined that the section does not need to be dispatched.

9. An electronic device, comprising: The device comprises: a memory configured to store a program; a processor configured to execute the program stored in the memory, and when the processor executes the program stored in the memory, the processor is configured to execute the method.

10. A storage medium, characterized by The device stores computer executable instructions, and the computer executable instructions are configured to execute the method. The computer executable instructions are configured to execute the method.

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