Power supply line fault transfer method, line, system, device and storage medium

Abstract

The application discloses a power supply line fault switching method, a line, a system, a device and a storage medium, and the method comprises the following steps: acquiring a historical fault type of a power supply line; presetting a corresponding solution according to the historical fault type; acquiring a current fault type of the power supply line; and matching the current fault type of the power supply line with the preset solution to obtain a final solution. The power grid accident plan compiling efficiency is improved: with the aid of automatic means, the power grid risk in the power grid plan work or the power grid risk in the accident emergency disposal situation is analyzed, reasonable suggestions are provided for the substation mode adjustment measures, and the dispatching mode professional work efficiency is improved.

Description

Technical Field

[0001] This invention belongs to the field of power system maintenance technology, specifically relating to a power supply line fault transfer method, line, system, device and storage medium. Background Technology

[0002] Currently, the main method for developing power grid risk contingency plans is manual assessment. However, the power grid structure is complex, and many factors influence mode adjustments. When a substation outage occurs, even with a comprehensive dispatch plan, dispatchers still need to check the status of key protected equipment against the anticipated fault scenarios outlined in the plan, and simultaneously calculate the feasibility of load transfer strategies. After the power grid mode adjustment is completed, it is necessary to manually calculate the load rate of reverse-current lines and main transformers, and to assess the impact on lines that cannot be transferred and important users.

[0003] The current emergency response plan development method, which relies heavily on manual judgment, involves a lot of repetitive work, is inefficient, and does not facilitate the efficient use of human resources. In the event of a substation accident, the emergency response model, which relies on manual assessment of the power grid's operational status, consumes a significant amount of the energy and time of control and operation personnel. Summary of the Invention

[0004] The purpose of this invention is to provide a method, line, system, device and storage medium for transferring power supply during power line faults, which solves the problem in the prior art that the emergency response mode of manually judging the power grid operation status consumes a lot of energy and time of the control and operation personnel.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] In a first aspect, the present invention provides a method for switching power supply during a power line fault, comprising the following steps:

[0007] Obtain the historical fault types of the power supply line;

[0008] Pre-set corresponding solutions based on historical fault types;

[0009] Obtain the current fault type of the power supply line;

[0010] The current fault type of the power supply line is matched with the preset solutions to obtain the final solution.

[0011] Optionally, the power supply line fault types include single outgoing line fault, single bus fault, single transformer fault, and entire substation fault.

[0012] Optionally, obtaining a final solution includes:

[0013] When a single outgoing line fails, the load transfer capacity of the tie line connected to the faulty outgoing line through the tie switch is determined. If the load to be transferred by the faulty outgoing line is less than the load transfer capacity of the tie line, load transfer is performed; otherwise, no load transfer is provided.

[0014] When a single busbar fails, the load transfer capacity of each connecting line to the outgoing line of the failed single busbar is determined. If the load transfer requirements are met, load transfer is provided; otherwise, load transfer is not provided.

[0015] When a single transformer fails, the busbar of the failed transformer is connected to the busbar of the normal transformer through the bus tie switch. It is determined whether the transfer capacity of the normal transformer busbar can fully meet the load transfer demand of the failed transformer busbar. If it can, the load transfer is provided. Otherwise, based on the load transfer capacity of the normal transformer busbar, the optimal number of outgoing lines from the outgoing lines of the failed transformer busbar are selected for load transfer.

[0016] When the entire substation fails, power is cut off between the transformer outgoing lines and the bus incoming lines, and the tie switches between adjacent busbars are disconnected. At this time, a tie line of one outgoing line connected to the busbar is selected for load transfer. The load transfer capacity of the tie line is determined. If the load transfer capacity of the tie line is greater than the total load transfer demand of the other outgoing lines connected to the busbar, then all the load is transferred. If the load transfer capacity of the tie line does not meet the total load transfer demand of the other outgoing lines connected to the busbar, the optimal number of outgoing lines from the remaining outgoing lines connected to the busbar are selected for load transfer.

[0017] Optionally, when a single transformer fails or the entire substation fails, the load transfer capacity of all tie lines capable of providing load transfer is calculated separately, and the tie line with the strongest load transfer capacity is selected for load transfer.

[0018] Optionally, when the entire substation fails, the maximum load transfer capacity that the tie line can provide is: I maxi I maxi =I mci -I i –I i’ Among them, I mci I is the minimum current-carrying parameter for the tie line. i For the loads connected to the outgoing lines of the tie line, I i’ This represents the load value of the connecting line.

[0019] Optionally, when load transfer is performed, the load factor of the power transformer on the tie line is less than 130% of the rated current carrying capacity.

[0020] In a second aspect, the present invention provides a line for implementing the above-described power supply line fault transfer method, comprising a plurality of transformers, each transformer having its own corresponding busbar connected to its outgoing line, each busbar having its own outgoing line connected to it, and all or some of the outgoing lines being connected to a tie line via a tie switch; adjacent two busbars are connected to each other via a bus tie switch.

[0021] A third aspect of the present invention provides a system for the above-described power supply line fault transfer method, comprising:

[0022] The first acquisition module is used to acquire the historical fault types of the power supply line;

[0023] The preset module is used to preset corresponding solutions based on historical fault types;

[0024] The second acquisition module is used to acquire the current fault type of the power supply line;

[0025] The matching module is used to match the current fault type of the power supply line with the preset solutions to obtain the final solution.

[0026] A fourth aspect of the present invention provides a computer device including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the above-described power supply fault transfer method.

[0027] A fifth aspect of the present invention provides a computer-readable storage medium storing a computer program that, when executed by a processor, implements the above-described power supply fault transfer method.

[0028] The beneficial effects of this invention are as follows:

[0029] 1) The power supply line fault transfer method provided in this embodiment of the invention matches the current fault type of the power supply line with a preset solution to obtain a final solution. It improves the efficiency of power grid accident contingency plan preparation: by using automated means to assist in the analysis of power grid risks under planned operation or emergency response conditions, it provides reasonable suggestions for substation mode adjustment measures, thereby improving the efficiency of dispatching work.

[0030] 2) Compared with the current situation where manual route selection generally uses rough calculations, the power supply line fault transfer method provided in this embodiment of the invention can minimize load loss; compared with the enumeration method for route selection, the above method can significantly reduce the number of calculations and improve route selection efficiency.

[0031] 3) The power supply line fault transfer method provided in this embodiment of the invention can improve the power grid’s ability to respond to sudden accidents. By comparing the line load transfer capacity, it provides suggestions on bus reverse load and circuit switching measures, which can provide auxiliary decision-making for dispatchers to handle accidents, allowing personnel to focus on fault handling, shorten the time required for load transfer, and minimize the power outage time during accidents.

[0032] 4) The power supply line fault transfer method provided in this embodiment of the invention can improve the power supply service level for customers: quickly and accurately provide information on the load rate of key protected equipment and the impact on users, and provide data support for related professions such as control, safety supervision, operation and maintenance, and marketing. Attached Figure Description

[0033] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0034] Figure 1 This is a schematic diagram of the power supply transfer method for power line faults provided in an embodiment of the present invention.

[0035] Figure 2 This is a schematic diagram of a single outgoing line failure in an embodiment of the present invention.

[0036] Figure 3 This is a schematic diagram of a single busbar fault in an embodiment of the present invention.

[0037] Figure 4 This is a schematic diagram of a single transformer fault in an embodiment of the present invention.

[0038] Figure 5 This is a schematic diagram of a complete substation shutdown in an embodiment of the present invention. Detailed Implementation

[0039] The present invention will now be described in detail with reference to the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0040] The following detailed description is exemplary and intended to provide further detailed explanation of the invention. Unless otherwise specified, all technical terms used in this invention have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains. The terminology used in this invention is for the purpose of describing particular embodiments only and is not intended to limit the scope of exemplary embodiments according to the invention.

[0041] like Figure 1 As shown, a first aspect of the present invention provides a power supply transfer method for power line faults, comprising the following steps:

[0042] S1. Obtain the historical fault types of the power supply line.

[0043] In this embodiment, the historical fault types of the power supply line include single outgoing line faults, single busbar faults, single transformer faults, and substation faults.

[0044] S2. Pre-set corresponding solutions based on historical fault types.

[0045] The above-mentioned preset solution:

[0046] S21. Assume the faulty busbar has N outgoing lines, and each outgoing line or some outgoing lines are connected to a tie line via a tie switch. When the i-th line (i∈N) is selected for busbar reverse load, the total load added to the remaining lines is no greater than I. maxi (A)

[0047] Let I be the load value of the i-th line outgoing from the faulty bus. i (A), the interconnection line load value is I. i’ (A), Minimum current-carrying parameter I mci (A) When the i-th line (i∈N) is selected for bus reverse transmission, the maximum load that can be supplied is I. maxi We can obtain: I maxi =I mci -I i –I i '.

[0048] Let I be the total load added to the remaining j lines that meet the load transfer requirements at this time. sumi (A) gives: j∈N&j≠i and I sumi maxi Therefore, the lost load I loosi :I loosi =I maxi –I sumi The objective is to reduce load I. loosi Minimum.

[0049] S22. Create a preset lookup table

[0050] Currently, a 110kV substation typically has no more than 20 outgoing lines connected to its 10kV busbar. A pre-existing list of 1 to 20 outgoing lines is used as a lookup table (the number of pre-stored lookup tables can be increased). If the number of outgoing lines connected to the 10kV busbar is N, when selecting the i-th line for busbar reverse transmission, the number of outgoing lines to be transferred to the load is N-1. The full list is categorized by "selecting n elements from N-1", and the sum of the selected elements is then sorted.

[0051] ​Taking the case where there are 5 candidates, there is 1 possibility of selecting all 5 candidates, 5 possibilities of selecting 4 and 1, and 10 possibilities of selecting 3 and 2, for a total of 31 possibilities.

[0052] The elements are divided into blocks I-V based on the number of selected elements, and then sorted in descending order of summation value within each block. The pre-defined full permutation list is shown in Table 1.

[0053] Table 1

[0054]

[0055] S23. Find the optimal transfer line.

[0056] The lines will be sorted according to their load size and mapped one-to-one in a relational table. That is, the line with the largest outgoing load will be numbered n, and the line with the smallest load will be numbered 1.

[0057] Select the preset lookup table with candidate line N.

[0058] Find the total load increment I of the remaining j lines in the blocks with different numbers of elements. sumi (A) Not greater than I maxi Combination methods.

[0059] Since the outgoing lines have been sorted according to load size, the total load increments for various combinations within each block must also be arranged from largest to smallest. Therefore, within each block, the first step is to determine whether the total load increment for the first row exceeds I. maxi If the total load is less than I maxi If the total load is greater than I, then this combination represents the maximum transferable load, and it is not necessary to calculate the total load increment for other combination methods; maxi If the total load of the last row in this block is greater than I maxi If no combination meets the conditions within that block, proceed directly to the next block; otherwise, among the remaining combination methods, use the binary search method to find a combination where the total load increment is not greater than I. maxi The maximum combination method.

[0060] By comparing the maximum combined load in each block, the combination with the largest load is selected as the optimal solution.

[0061] In other words, by using the above method, the total load value to be transferred for each of the various line selection combinations is first sorted, and then the combination that is less than the load transfer value provided by the tie line and is closest to the load transfer value provided by the tie line is selected as the optimal solution. The combination represented by the optimal solution is the best line selection.

[0062] S24. The following is an explanation using a real-world example:

[0063] Suppose that a 10kV busbar in a substation needs to be reverse-driven via a 10kV outgoing line. The loads of the outgoing lines and tie lines connected to this 10kV busbar are shown in Table 2:

[0064] Table 2

[0065]

[0066] Taking 211 as the reverse-band line as an example, the maximum load I can be supplied at this time. maxi =550-84-72=394(A). First, sort the remaining lines according to their load size, and then map lines 212-217 to lines 1-5 respectively. The resulting mapping table is shown in Table 3.

[0067] Table 3

[0068] Dispatch number Load (A) Line number 214 21 1 212 84 2 215 135 3 216 147 4 213 170 5

[0069] The pre-stored lookup table of candidate lines N-1=5 is read, and the maximum value that meets the conditions is found in each block. The search process is shown in Table 2. Following the above rules, all calculations can be completed after 10 calculations.

[0070] Table 4

[0071]

[0072] After comparison, it can be found that the maximum load that meets the conditions is 387 when four lines are selected, and the combination method is lines 1, 2, 3, and 4.

[0073] The maximum load that meets the conditions when selecting 3 lines is 389, and the combination method is lines 2, 3, and 5;

[0074] The maximum load that meets the conditions when selecting two lines is 317, and the combination method is lines 4 and 5.

[0075] The comparison shows that 389 > 387 > 317. Therefore, when the total load is 389, that is, when lines 2, 3, and 5 (corresponding to 212, 215, and 213) are selected as the outgoing lines, the load transfer can be maximized.

[0076] It was found that when using line 211 for bus reverse operation, lines 212, 213, and 215 can be reversed, while lines 214 and 216 cannot be reversed. The maximum load for reverse operation is the sum of the loads of lines 211, 212, 213, and 215, which is 84 + 389 = 473. Further calculations were made of the maximum load achievable using other lines for reverse operation, and the optimal reverse line was determined through comparison.

[0077] As can be seen, in this case, the above method only requires 10 calculations to find the optimal solution, while the enumeration method requires 31 calculations. When the number of candidate routes is larger, the difference in computational complexity will further increase. Therefore, compared to the enumeration method, this method significantly reduces the computational load for route selection and improves analysis efficiency by incurring only a small amount of pre-stored table memory.

[0078] S3. Obtain the current fault type of the power supply line. In this embodiment, the current fault types of the power supply line include single outgoing line fault, single bus fault, single transformer fault, and entire substation fault.

[0079] S4. Match the current fault type of the power supply line with the preset solutions to obtain the final solution. Specific methods include the following:

[0080] Line load factor:

[0081] Power transformer load rate:

[0082] like Figure 2 As shown, when a single outgoing line fails, the load transfer capacity of the tie line connected to the faulty outgoing line via the tie switch is determined. Specifically, if η line <100% and η trs If the load is less than 130%, load transfer can be implemented. Load transfer will be carried out when the load required for transfer from a faulty outgoing line is less than the load transfer capacity of the tie line; otherwise, load transfer will not be provided.

[0083] like Figure 3 As shown, when a single busbar fails, the load transfer capacity of each connecting line to the outgoing line of the failed busbar is determined. Specifically, if η line <100% and η trs If the load is less than 130%, load transfer can be implemented. If the load transfer requirement is met, load transfer will be provided; otherwise, load transfer will not be provided.

[0084] like Figure 4 As shown, when a single transformer fails, the busbar of the failed transformer is connected to the busbar of the normal transformer through the bus tie switch. It is determined whether the transfer capacity of the normal transformer busbar can fully meet the load transfer demand of the failed transformer busbar. If it can, the load transfer is provided; otherwise, based on the load transfer capacity of the normal transformer busbar, the optimal number of outgoing lines from the outgoing lines of the failed transformer busbar are selected for load transfer.

[0085] like Figure 5As shown, when the entire substation fails, the power is cut off between the transformer outgoing line and the bus incoming line, and the tie switch between adjacent busbars is disconnected. At this time, a tie line of one outgoing line connected to the busbar is selected for load transfer. The load transfer capacity of the tie line is determined. If the load transfer capacity of the tie line is greater than the total load transfer demand of the other outgoing lines connected to the busbar, then all the load is transferred. If the load transfer capacity of the tie line does not meet the total load transfer demand of the other outgoing lines connected to the busbar, the optimal few outgoing lines are selected from the remaining outgoing lines connected to the busbar for load transfer.

[0086] In the above embodiments, the selected optimal outgoing lines are the schemes that minimize load loss while meeting the carrying capacity of the line equipment. That is, the sum of the load values ​​transferred by the selected optimal outgoing lines is closest to the maximum load transfer value provided by the tie line.

[0087] In other embodiments, when a single transformer fails or the entire substation fails, the load transfer capacity of all tie lines capable of providing load transfer is calculated separately, and the tie line with the strongest load transfer capacity is selected for load transfer.

[0088] In some other embodiments, the maximum load transfer capacity that the tie line can provide when the entire substation fails is: I maxi I maxi =I mci -I i –I i’ Among them, I mci I is the minimum current-carrying parameter for the tie line. i For the loads connected to the outgoing lines of the tie line, I i’ This represents the load value of the connecting line.

[0089] In some other embodiments, when load transfer is performed, the load factor of the power transformer on the tie line is less than 130% of the rated current carrying capacity.

[0090] For lines where load transfer is feasible, output recommendations include switching measures and the load rate of relevant equipment after load transfer. For lines where load transfer is not feasible, output recommendations include the impact of power outages on special-grade, first-grade, and second-grade users, as well as the number of residents.

[0091] In a second aspect, the present invention provides a line for implementing the above-described power supply line fault transfer method, comprising a plurality of transformers, each transformer having its own corresponding busbar connected to its outgoing line, each busbar having its own outgoing line connected to it, and all or some of the outgoing lines being connected to a tie line via a tie switch; adjacent two busbars are connected to each other via a bus tie switch.

[0092] A third aspect of the present invention provides a system for the above-described power supply line fault transfer method, comprising:

[0093] The first acquisition module is used to acquire the historical fault types of the power supply line;

[0094] The preset module is used to preset corresponding solutions based on historical fault types;

[0095] The second acquisition module is used to acquire the current fault type of the power supply line;

[0096] The matching module is used to match the current fault type of the power supply line with the preset solutions to obtain the final solution.

[0097] A fourth aspect of the present invention provides a computer device including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the above-described power supply fault transfer method.

[0098] In a fifth aspect, the present invention provides a computer-readable storage medium storing a computer program that, when executed by a processor, implements the above-described power supply fault transfer method.

[0099] Those skilled in the art will understand that embodiments of this application can be provided as methods, systems, or computer program products. Therefore, this application can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, this application can take the form of a computer program product embodied 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.

[0100] This application is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of this application. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart... Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0101] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0102] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0103] As is known from common technical knowledge, this invention can be implemented through other embodiments that do not depart from its spirit or essential characteristics. Therefore, the disclosed embodiments described above are merely illustrative in all respects and are not the only ones. All modifications within the scope of this invention or its equivalents are included in this invention.

Claims

1. A method for switching power supply during a power line fault, characterized in that, Includes the following steps: Obtain historical fault types for power supply lines; fault types include single outgoing line faults, single busbar faults, single transformer faults, and substation-wide faults. Pre-set corresponding solutions based on historical fault types; The preset solution includes: pre-creating a lookup table of permutations for different numbers of outgoing lines, partitioning the lookup table according to the number of selected outgoing lines, and sorting the selected outgoing lines from largest to smallest within each partition according to the total load value of the selected outgoing lines; Obtain the current fault type of the power supply line; The current fault type of the power supply line is matched with the preset solutions to obtain the final solution; The process of obtaining the final solution specifically includes: When a single outgoing line is faulty, the load transfer capacity of the tie line connected to the faulty single outgoing line through the tie switch is determined. If the load to be transferred by the faulty single outgoing line is less than the load transfer capacity of the tie line, load transfer is performed; otherwise, no load transfer is provided. When a single busbar is faulty, the load transfer capacity of each connecting line to the outgoing line of the faulty single busbar is determined. If the load transfer requirements are met, load transfer is provided; otherwise, load transfer is not provided. When a single transformer fails, the busbar of the failed transformer is connected to the busbar of the normal transformer through the bus tie switch. It is determined whether the transfer capacity of the normal transformer busbar can fully meet the load transfer demand of the failed transformer busbar. If it can, the load transfer is provided. Otherwise, based on the load transfer capacity of the normal transformer busbar and a pre-established lookup table, the optimal few outgoing lines from the outgoing lines connected to the failed transformer busbar are selected for load transfer using a binary search method. The optimal few outgoing lines refer to the combination of outgoing lines whose total load value does not exceed the maximum transferable load of the tie line and is closest to that value. When the entire substation fails, power is cut off between the transformer outgoing lines and the bus incoming lines, and the tie switches between adjacent busbars are disconnected. At this time, a tie line of one outgoing line connected to the busbar is selected for load transfer. The load transfer capacity of the tie line is determined. If the load transfer capacity of the tie line is greater than the total load transfer demand of the other outgoing lines connected to the busbar, then all load transfer is provided. If the load transfer capacity of the tie line does not meet the total load transfer demand of the other outgoing lines connected to the busbar, then based on a pre-established lookup table, the optimal number of outgoing lines connected to the busbar are selected for load transfer using a binary search method. When load transfer is performed, the load factor of the power transformer on the interconnection line is less than 130% of the rated current carrying capacity.

2. The power supply fault transfer method according to claim 1, characterized in that, When a single transformer fails or the entire substation fails, calculate the load transfer capacity of all tie lines that can provide load transfer, and select the tie line with the strongest load transfer capacity for load transfer.

3. The power supply fault transfer method according to claim 1, characterized in that, When the entire substation fails, the maximum load transfer capacity that the tie line can provide is: I maxi I maxi = I mci - I i – I i’ Among them, I mci I is the minimum current-carrying parameter for the tie line. i For the loads connected to the outgoing lines of the tie line, I i’ This represents the load value of the connecting line.

4. The power supply fault transfer method according to claim 1, characterized in that, When load transfer is performed, the load factor of the power transformer on the interconnection line is less than 130% of the rated current carrying capacity.

5. A power supply line for implementing the power supply line fault transfer method of claim 1, characterized in that, It includes several transformers, each of which has its own corresponding busbar connected to its outgoing line. Each busbar is connected to its own outgoing line, and all or some of the outgoing lines are connected to a tie line via a tie switch. Adjacent busbars are connected by a bus tie switch.

6. A system for implementing the power supply fault transfer method of claim 1, characterized in that, include: The first acquisition module is used to acquire the historical fault types of the power supply line; The preset module is used to preset corresponding solutions based on historical fault types; The second acquisition module is used to acquire the current fault type of the power supply line; The matching module is used to match the current fault type of the power supply line with the preset solutions to obtain the final solution.

7. A computer device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, When the processor executes the computer program, it implements the power supply fault transfer method as described in any one of claims 1 to 5.

8. A computer-readable storage medium storing a computer program, characterized in that, When the computer program is executed by the processor, it implements the power supply transfer method for power line faults as described in any one of claims 1 to 5.

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