A load balancing transfer method and related equipment considering the main distribution coordination mode

Abstract

The present invention discloses a load balancing transfer method and related equipment under the main distribution coordination mode. Based on the existing main network transfer idea, appropriate main transformer load is selected for transfer, and the remaining overload load is non-directionally transferred through the communication relationship between distribution networks. Compared with the traditional method of relying solely on the main network transfer, it is relatively "gentle", which not only realizes the reasonable use of the carrying capacity of regional power grid equipment, but also satisfies the load balancing transfer. By setting established rules for automatic line selection, all transfer possibilities can be enumerated and verified, which cannot be achieved or requires great effort to analyze simply by manpower, effectively improving the efficiency of quickly avoiding risks in load peak or power grid failure scenarios, meeting the requirements of safe and stable operation of the power grid, and ensuring the reliability of power grid power supply.

Description

Technical Field

[0001] The present invention relates to the technical field of power system simulation and operation control, and in particular to a load balancing transfer method and related equipment in consideration of a main distribution coordination mode. Background Art

[0002] In recent years, as population growth, air pollution, and ecological environmental damage have led to a continuous rise in temperature during the same period, the power load of the power grid has repeatedly hit new highs, especially during the peak summer period. The main transformers of 220kV substations in most areas are basically fully loaded, and the main transformers are frequently overloaded during peak hours. In order to ensure the safe operation of power grid equipment, it is necessary to eliminate operating risks in a timely manner. Traditional means mainly eliminate main transformer overload by transferring the main transformer load between substations; however, the power grid structure of the main grid is relatively simple, and the acceptable capacity of all plants and stations during the same peak load period is limited. Simply transferring power through the main grid can easily "overload" and cause the main transformer of the 220kV substation in the adjacent area to be overloaded, forming new power grid operation risks and even aggravating the power grid bearing pressure. Summary of the invention

[0003] Based on the problems raised by the above background technology, the purpose of the present invention is to provide a load balancing transfer method and related equipment taking into account the main and distribution coordination mode, which solves the problem that the power grid structure of the main grid is relatively single and the acceptance capacity of all plants and stations is limited during the peak load period. Simply transferring power through the main grid can easily cause the main transformer of the 220kV substation in the adjacent area to be overloaded, creating new power grid operation risks and even aggravating the power grid bearing pressure.

[0004] The present invention is achieved through the following technical solutions:

[0005] A first aspect of the present invention provides a load balancing transfer method considering a master-distributor coordination mode, comprising the following steps:

[0006] Step S1, using the initial operation mode of the power grid and the equipment flow data as the overload main transformer to generate a base state section, and using the initial section to determine the load gap;

[0007] Step S2, determining an effective main grid power transfer combination based on the load gap, the overloaded main transformer and the base state section;

[0008] Step S3, traverse the effective main grid transfer combinations in turn, and determine the effective distribution network coordinated transfer combination with the remaining load gap after applying the load that can be transferred by the main grid combination as the improvement target;

[0009] Step S4: superimpose the transfer strategy corresponding to the effective main network transfer combination and the transfer strategy of the effective distribution network coordinated transfer combination to form a combined strategy and start the power flow calculation. If the power flow calculation converges, the main distribution coordinated strategy verification is performed;

[0010] Step S5, repeat steps S2 to S4 until all valid main grid power supply combination solutions are searched and verified, and a load balancing transfer strategy is output.

[0011] In the above technical scheme, the overloaded main transformer of 220kV plant is taken as the object, the load amount to be transferred is determined and defined as the load gap, and the downstream load connected to the main transformer is searched through the topology; a new main grid transfer combination is formed by freely combining the 110kV main grid load set, and the main grid transfer combination that does not exceed the load gap and the combination whose remaining load gap meets the carrying capacity of the distribution network after applying the main grid transfer combination is selected as the final effective main grid transfer combination.

[0012] By traversing the valid main grid transfer combinations in turn, searching for the transfer strategy corresponding to the current main grid transfer combination, taking the remaining load gap as the improvement target and defining it as the distribution network coordinated load, screening the distribution network coordinated transfer combinations, and selecting the valid plant-station distribution network transfer combinations.

[0013] During the screening process, the 10kV distribution network load set of the 220kV station is preferentially searched for effective interconnecting feeders, and then the 110kV plant station connected downstream of the 220kV station is searched for effective interconnecting feeders, and finally a distribution network transfer unit based on the plant station is formed; among them, if the distribution network transfer unit of a single plant station meets the distribution network collaborative load, it is directly included in the effective distribution network collaborative transfer combination; otherwise, the remaining distribution network transfer units of the plant station are freely reorganized, and it is determined whether all combined loads meet the distribution network collaborative load. If so, the combination is also included in the effective distribution network collaborative transfer combination; otherwise, the invalid combination is eliminated; finally, by collecting all effective distribution network transfer combinations to search for corresponding transfer strategies, the distribution network transfer combination that can be superimposed under the current main network transfer combination is determined, and then the transfer under the distribution network transfer combination is traversed in turn. The strategy is superimposed on the strategy under the current main grid transfer combination and a simulation flow calculation is performed. First, it is verified whether the accepted 220kV plant station on the current power grid section is overloaded after the transfer and whether the overload phenomenon of the original overloaded 220kV plant station is eliminated. Then, based on the main grid load transferred within the specified time period, it is respectively superimposed on the accepted 220kV plant station main transformer and separated from the original 220kV plant station overload main transformer to see whether an overload phenomenon occurs. If both the current section verification and the historical verification within the specified time period are met, the main and distribution coordinated combination scheme is marked as a valid scheme; otherwise, the main and distribution coordinated combination scheme is marked as an invalid scheme; until the verification of all main grid combinations and distribution network coordinated transfer combinations is completed, all schemes are finally visualized and output, and the feasibility of the scheme is quantified by artificially setting the evaluation criteria of the scheme, so as to achieve the purpose of improving the overloaded main transformer.

[0014] In an optional embodiment, determining the load notch using the initial section includes the following steps:

[0015] Step S11, obtaining the mitigation object sent by the user and performing parameter parsing on the mitigation object to generate input parameters;

[0016] Step S12, verifying the input parameters according to the overloaded main transformer and the plant information to which the overloaded main transformer belongs;

[0017] Step S13, determining the active load, capacity upper limit and main transformer regulation margin of the overloaded main transformer at the current section based on the initial section and the input parameters after verification;

[0018] Step S14: Calculate the active load, the capacity upper limit and the main transformer regulation margin to obtain a load gap.

[0019] In an optional embodiment, determining an effective main grid power transfer combination based on the load gap, the overloaded main transformer and the base state section comprises the following steps:

[0020] Step S21: searching the downstream loads connected to the overloaded main transformer through deep topology, wherein the downstream loads include a distribution network load set and a main network load set;

[0021] Step S22, selecting downstream transferable power plants from the main grid load set to obtain transferable power plants, freely combining the transferable power plants, and enumerating the freely combined transferable power plants to determine the original main grid transfer combination;

[0022] Step S23, selecting the original main network transfer combination that meets the validity conditions as the valid main network transfer combination;

[0023] Step S24, traverse the valid main network transfer combinations in sequence, determine the transfer strategies corresponding to the valid main network transfer combinations, and form a transfer strategy mapping relationship.

[0024] In an optional embodiment, the validity condition includes:

[0025] The transferable load of the original main grid transfer combination is less than the load gap of the overloaded main transformer; and

[0026] The remaining load gap of the original main grid transfer combination is less than the upper limit of the distribution network transfer load.

[0027] In an optional embodiment, the effective main grid transfer combinations are traversed in sequence, and the effective distribution network coordinated transfer combination is determined with the load gap remaining after the load that can be transferred by the main grid combination as the improvement target, including the following steps:

[0028] Step S31, obtaining the distribution network connection relationship, searching the downstream load connected to the overloaded main transformer through the deep topology, and determining the transferable load in combination with the distribution network connection relationship;

[0029] Step S32, defining the original load, traversing the transferable loads and screening to obtain effective distribution network transfer units based on the original loads;

[0030] Step S33: when there is an effective distribution network transfer combination, traverse the effective distribution network transfer units, and screen the effective distribution network transfer units to obtain an effective distribution network collaborative transfer combination;

[0031] Step S34, traversing the effective distribution network collaborative transfer combination in sequence, and determining a transferable load mapping relationship set of the effective distribution network collaborative transfer combination;

[0032] Step S35, traverse the transferable load mapping relationship set to determine the transfer strategy corresponding to the distribution network collaborative transfer combination.

[0033] In an optional embodiment, the main-distribution coordination strategy verification includes main network strategy verification and distribution network strategy verification;

[0034] The main network strategy verification includes:

[0035] Step A: If the receiving plant is overloaded after the transfer strategy corresponding to the effective main grid transfer combination is implemented, or the overload phenomenon of the plant to which the overloaded main transformer belongs has not been eliminated, the transfer strategy corresponding to the effective main grid transfer combination is invalid; otherwise, execute step B;

[0036] Step B, obtaining the load curves of the receiving main transformer and the overloaded main transformer within the specified time period in the input parameters, if the load curve within the specified time period generated after the main grid load transferred by the effective main grid transfer combination is superimposed on the receiving main transformer plant station shows an overload phenomenon, or the main grid load is separated from the overloaded main transformer and still has an overload phenomenon within the specified time period, then the transfer strategy corresponding to the effective main grid transfer combination is invalid; otherwise, the transfer strategy corresponding to the effective main grid transfer combination is valid;

[0037] The network distribution strategy verification includes:

[0038] If, after the plant accepts the transfer strategy of the effective distribution network coordinated transfer combination, the current current of any interconnecting feeder in the effective distribution network coordinated transfer combination exceeds the upper limit of the interconnecting feeder current, the transfer strategy of the effective distribution network coordinated transfer combination is invalid; otherwise, if no overload is found in the interconnecting feeder verification, the transfer strategy of the effective distribution network coordinated transfer combination is valid.

[0039] In an optional embodiment, step S5 further includes: weighted scoring of the load balancing transfer strategy based on the number of switch operations, the maximum load rate, and the influencing factors of the transferred load conditions to obtain a load balancing transfer strategy score, and adjusting the load balancing transfer strategy according to the load balancing transfer strategy score.

[0040] A second aspect of the present invention provides a load balancing transfer system considering a master-distributor coordination mode, comprising:

[0041] The initial module is used to generate a base state section for the overloaded main transformer using the initial operation mode of the power grid and the equipment flow data, and to determine the load gap using the initial section;

[0042] A main grid transfer module, used to determine an effective main grid transfer combination based on the load gap, the overloaded main transformer and the base state section;

[0043] The distribution network transfer module is used to traverse the effective main network transfer combinations in turn, and determine the effective distribution network coordinated transfer combination based on the remaining load gap after the load that can be transferred by the main network combination as the improvement target;

[0044] The verification module is used to superimpose the transfer strategy corresponding to the effective main network transfer combination with the transfer strategy of the effective distribution network coordinated transfer combination to form a combined strategy and start the power flow calculation. If the power flow calculation converges, the main and distribution coordinated strategy verification is performed;

[0045] The output module is used to output the load balancing transfer strategy.

[0046] A third aspect of the present invention provides an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the program, a load balancing transfer method is implemented that takes into account the main and distribution coordination mode.

[0047] A fourth aspect of the present invention provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements a load balancing transfer method in consideration of a master-distributor coordination mode.

[0048] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0049] 1. In order to alleviate the frequent overload problem of 220kV main transformers in the regional power grid, appropriate main transformer loads are selected for transfer based on the existing main grid transfer ideas, and the remaining overload loads are transferred in a non-directional manner through the connection relationship between distribution networks. Compared with the traditional method of relying solely on the main grid transfer, it is more "gentle", which not only realizes the reasonable use of the carrying capacity of regional power grid equipment, but also satisfies the load balance transfer;

[0050] 2. By setting established rules for automatic line selection, all possible power transfers can be enumerated and verified, which cannot be achieved through manpower alone or requires a lot of effort to analyze. This effectively improves the efficiency of quickly avoiding risks in load peak or power grid failure scenarios, meets the requirements for safe and stable operation of the power grid, and ensures the reliability of power supply. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] In order to more clearly illustrate the technical solutions of the exemplary embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and should not be regarded as limiting the scope. For those of ordinary skill in the art, other relevant drawings can be obtained based on these drawings without creative work. In the drawings:

[0052] Figure 1 A flow chart of a load balancing transfer method considering the main distribution coordination mode provided in Example 1 of the present invention;

[0053] Figure 2 A schematic diagram of a flow chart of a search diagram of a distribution network strategy unit provided in Embodiment 1 of the present invention;

[0054] Figure 3 A schematic diagram of a flow chart of a strategy verification unit schematic diagram provided in Embodiment 1 of the present invention;

[0055] Figure 4 A schematic diagram of the structure of an electronic device provided in Example 3 of the present invention. DETAILED DESCRIPTION

[0056] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with embodiments and drawings. The exemplary embodiments of the present invention and their description are only used to explain the present invention and are not intended to limit the present invention. Example

[0057] Figure 1 A flow chart of a load balancing transfer method considering the main distribution coordination mode provided in Example 1 of the present invention is as follows: Figure 1 As shown, a load balancing transfer method considering the main distribution coordination mode includes the following steps:

[0058] Step S1, using the initial operation mode of the power grid and the equipment flow data as the overload main transformer to generate a base state section, and using the initial section to determine the load gap;

[0059] Step S2, determining an effective main grid power transfer combination based on the load gap, the overloaded main transformer and the base state section;

[0060] Step S3, traverse the effective main grid transfer combinations in turn, and determine the effective distribution network coordinated transfer combination with the remaining load gap after applying the load that can be transferred by the main grid combination as the improvement target;

[0061] Step S4: superimpose the transfer strategy corresponding to the effective main network transfer combination and the transfer strategy of the effective distribution network coordinated transfer combination to form a combined strategy and start the power flow calculation. If the power flow calculation converges, the main distribution coordinated strategy verification is performed;

[0062] Step S5, repeat steps S2 to S4 until all valid main grid power supply combination solutions are searched and verified, and a load balancing transfer strategy is output.

[0063] It should be noted that, taking the overloaded main transformer of 220kV plant as the object, the load amount to be transferred is determined and defined as the load gap, and the downstream load connected to the main transformer is searched through the topology; a new main grid transfer combination is formed by freely combining the 110kV main grid load set, and the main grid transfer combination that does not exceed the load gap and the combination whose remaining load gap meets the carrying capacity of the distribution network after applying the main grid transfer combination is selected as the final effective main grid transfer combination.

[0064] By traversing the valid main grid transfer combinations in turn, searching for the transfer strategy corresponding to the current main grid transfer combination, taking the remaining load gap as the improvement target and defining it as the distribution network coordinated load, screening the distribution network coordinated transfer combinations, and screening out the valid plant-station distribution network transfer combinations.

[0065] During the screening process, the 10kV distribution network load set of the 220kV station is preferentially searched for effective interconnecting feeders, and then the 110kV plant station connected downstream of the 220kV station is searched for effective interconnecting feeders, and finally a distribution network transfer unit based on the plant station is formed; among them, if the distribution network transfer unit of a single plant station meets the distribution network collaborative load, it is directly included in the effective distribution network collaborative transfer combination; otherwise, the remaining distribution network transfer units of the plant station are freely reorganized, and it is determined whether all combined loads meet the distribution network collaborative load. If so, the combination is also included in the effective distribution network collaborative transfer combination; otherwise, the invalid combination is eliminated; finally, by collecting all effective distribution network transfer combinations to search for corresponding transfer strategies, the distribution network transfer combination that can be superimposed under the current main network transfer combination is determined, and then the transfer under the distribution network transfer combination is traversed in turn. The strategy is superimposed on the strategy under the current main grid transfer combination and a simulation flow calculation is performed. First, it is verified whether the accepted 220kV plant station on the current power grid section is overloaded after the transfer and whether the overload phenomenon of the original overloaded 220kV plant station is eliminated. Then, based on the main grid load transferred within the specified time period, it is respectively superimposed on the accepted 220kV plant station main transformer and separated from the original 220kV plant station overload main transformer to see whether an overload phenomenon occurs. If both the current section verification and the historical verification within the specified time period are met, the main and distribution coordinated combination scheme is marked as a valid scheme; otherwise, the main and distribution coordinated combination scheme is marked as an invalid scheme; until the verification of all main grid combinations and distribution network coordinated transfer combinations is completed, all schemes are finally visualized and output, and the feasibility of the scheme is quantified by artificially setting the evaluation criteria of the scheme, so as to achieve the purpose of improving the overloaded main transformer.

[0066] In an optional embodiment, determining the load notch using the initial section includes the following steps:

[0067] Step S11, obtaining the mitigation object sent by the user and performing parameter parsing on the mitigation object to generate input parameters;

[0068] Step S12, verifying the input parameters according to the overloaded main transformer and the plant information to which the overloaded main transformer belongs;

[0069] Step S13, determining the active load, capacity upper limit and main transformer regulation margin of the overloaded main transformer at the current section based on the initial section and the input parameters after verification;

[0070] Step S14: Calculate the active load, the capacity upper limit and the main transformer regulation margin to obtain a load gap.

[0071] Specifically, when the system receives the mitigation object sent by the user, it analyzes the parameters of the mitigation object and generates input parameters. The input parameters include: overloaded main transformer, overloaded power plant, specified verification time period, upper limit of the number of schemes, upper limit of the distribution network transfer load, reference value of a single distribution network line, main transformer regulation margin, and power plant set not participating in the transfer.

[0072] The input parameters are verified according to the overload main transformer and its affiliated plant information corresponding to the current input parameters. The verification needs to meet the following two conditions: first, the affiliated plant of the overload main transformer must be a 220kV plant; second, the 110kV side of the affiliated plant of the overload main transformer is in split operation.

[0073] When the above two conditions are met at the same time, the input parameter verification is successful and the system continues to perform the downward search strategy; otherwise, the input parameter verification fails, the downward search strategy is stopped, and the calculation is exited.

[0074] The technicians in charge select the initial section according to the project requirements, and determine the active load on the current section of the 220kV overload main transformer based on the initial section and the input parameters that have been successfully verified. , capacity upper limit , Main transformer regulation margin , and calculate the above parameters to obtain the load required to be transferred, and define the load required to be transferred as the load gap .

[0075] Furthermore, the above parameters are calculated to obtain the following calculation formula for the load amount to be transferred:

[0076]

[0077] In an optional embodiment, determining an effective main grid power transfer combination based on the load gap, the overloaded main transformer and the base state section comprises the following steps:

[0078] Step S21: searching the downstream loads connected to the overloaded main transformer through deep topology, wherein the downstream loads include a distribution network load set and a main network load set;

[0079] Step S22, selecting downstream transferable power plants from the main grid load set to obtain transferable power plants, freely combining the transferable power plants, and enumerating the freely combined transferable power plants to determine the original main grid transfer combination;

[0080] Step S23, selecting the original main network transfer combination that meets the validity conditions as the valid main network transfer combination;

[0081] Step S24, traverse the valid main network transfer combinations in sequence, determine the transfer strategies corresponding to the valid main network transfer combinations, and form a transfer strategy mapping relationship.

[0082] Specifically, based on the base state section in step S1, the determined overloaded main transformer and the load gap, the overloaded main transformer is taken as the object, and the downstream load connected to the overloaded main transformer is searched through deep topology. In this embodiment, the downstream load is divided into two categories, one is the 10kV distribution network load set of the 220kV station, and the other is the 110kV main network load set connected to the station.

[0083] Select downstream transferable power plants from the 110kV main grid load set, and finally obtain all transferable power plants; it should be noted that if there are downstream power plants that are defined as not participating in the transfer in the input parameters during the selection process, they will not be included in the transferable power plants. Freely combine all transferable power plants, enumerate all possible main grid transfer combinations and the load that can be transferred in the combination, and arrange them in ascending order according to the transferable load, and determine the original main grid transfer combination.

[0084] The valid main grid transfer combinations are traversed in turn, and the status of the transfer plant and the plant to be adjusted is obtained by parsing each transfer combination, the operating status of the current transfer plant is determined, and the difference between the operating status of the current transfer plant and the status of the plant to be adjusted is compared to determine the operating strategy of the combination. Finally, a mapping relationship of the operating strategies corresponding to each main grid transfer combination is formed, and the 220kV plant accepted after the transfer of the strategy is recorded.

[0085] Among them, the main network transfer combination and its corresponding transfer strategy are shown in the following table:

[0086]

[0087] In an optional embodiment, the validity condition includes:

[0088] The transferable load of the original main grid transfer combination is less than the load gap of the overloaded main transformer; and

[0089] The remaining load gap of the original main grid transfer combination is less than the upper limit of the distribution network transfer load.

[0090] Specifically, the selection of a valid main grid transfer combination from the original main grid transfer combination determined in step S22 needs to meet the following two conditions at the same time:

[0091] (1) Transferable load of the original main grid transfer combination Less than the load gap of the overloaded main transformer ,Right now ;

[0092] (2) The remaining load gap of the original main grid transfer combination meets the distribution network carrying capacity , that is, the remaining load gap of the original main grid transfer combination Less than the load transferred by the distribution network The upper limit of .

[0093] When the original main grid transfer combination meets the above two conditions at the same time, it is selected as the effective main grid transfer combination, and the remaining load is defined as the distribution network collaborative load. The calculation formula is as follows:

[0094]

[0095] In an optional embodiment, the effective main grid transfer combinations are traversed in sequence, and the effective distribution network coordinated transfer combination is determined with the load gap remaining after the load that can be transferred by the main grid combination as the improvement target, including the following steps:

[0096] Step S31, obtaining the distribution network connection relationship, searching the downstream load connected to the overloaded main transformer through the deep topology, and determining the transferable load in combination with the distribution network connection relationship;

[0097] Step S32, defining the original load, traversing the transferable loads and screening to obtain effective distribution network transfer units based on the original loads;

[0098] Step S33: when there is an effective distribution network transfer combination, traverse the effective distribution network transfer units, and screen the effective distribution network transfer units to obtain an effective distribution network collaborative transfer combination;

[0099] Step S34, traversing the effective distribution network collaborative transfer combination in sequence, and determining a transferable load mapping relationship set of the effective distribution network collaborative transfer combination;

[0100] Step S35, traverse the transferable load mapping relationship set to determine the transfer strategy corresponding to the distribution network collaborative transfer combination.

[0101] like Figure 2 As shown, this step traverses the effective main grid transfer combinations in turn, and takes the remaining load gap after applying the main grid combination to transfer the load as the improvement target and defines it as the distribution network coordinated load , and based on this, the distribution network coordinated transfer combination is screened.

[0102] Specifically, the screening process is as follows:

[0103] By reading the distribution network contact relationship table of the three-area control cloud platform, the distribution network load contact relationship and the rated current limit of the distribution network load in the area are obtained for distribution network strategy screening and load transfer verification. The downstream load is searched in deep topology with the overloaded main transformer as the object, and the loads that do not have a contact relationship with the downstream load are excluded in combination with the distribution network contact relationship. The remaining loads with a contact relationship are statistically defined as transferable loads in units of plants and stations.

[0104] The power supply load downstream is defined as the original load by deep topological search with the overloaded main transformer as the object, and the transferable load is traversed. When the interconnecting feeder of the transferable load is the original load, it is excluded to prevent the transfer load from being transferred back to the overloaded main transformer.

[0105] Select the overload main transformer whose active load at the current section meets the error range of the reference value of the distribution network line in the input parameters (the default reference value is 3000kw, and the error range is 2500kW to 3500kW) and mark it as the effective transfer unit of the plant station, and define it as the effective distribution network transfer unit. Add the transferable load to the plant station until the transferable load of all plants and stations is completed. Then add the transferable load of all plants and stations and define it as , if the accumulated transferable load Greater than the distribution network coordinated load , then there is a valid distribution network transfer combination; otherwise, there is no valid distribution network transfer combination, and the search for the following distribution network strategy is stopped.

[0106] When it is determined that there is an effective distribution network transfer combination, the effective distribution network coordinated transfer combination is screened, and all effective plant distribution network transfer units are traversed. Among them, if the distribution network transfer unit of a single plant is greater than or equal to the distribution network coordinated load , it is directly included in the effective distribution network coordinated transfer combination; otherwise, the distribution network transfer units of the remaining plants and stations are freely reorganized, and if the load after all combinations is greater than or equal to the distribution network coordinated load , then the combination is also included as a valid distribution network coordinated transfer combination; otherwise, the invalid distribution network transfer combination is eliminated.

[0107] The effective distribution network coordinated supply transfer combinations are traversed in sequence;

[0108] By parsing a single distribution network coordinated transfer combination, the transfer load set corresponding to the transfer plant station is obtained, and mapping relationships are established between all transfer loads and interconnection feeders in the combination in turn. During the traversal process, the situation where the interconnection feeder with transfer loads already has a mapping relationship is excluded to avoid overload caused by the same transfer power source accepting multiple loads. Finally, a mapping relationship set of transferable loads in the combination is formed, and the current upper limit of the interconnection feeder is recorded for subsequent verification.

[0109] Traverse the mapping relationship set, search for the adjacent switch through the node for the transfer load to disconnect, and search for the adjacent switch through the node for the interconnecting feeder of the transfer load to close. If the adjacent switch itself is in the closed state, no switching operation is performed, and the load of the transfer load is superimposed on the interconnecting feeder until all mapping relationship sets in the combination are traversed. After completing the traversal of the mapping relationship set, mark the combination strategy as the operation strategy of the distribution network coordinated transfer combination. The main transfer strategies are shown in the following table:

[0110]

[0111] Finally, after completing the traversal of all valid distribution network collaborative transfer combinations, the transfer strategy mapping relationship corresponding to all valid distribution network transfer combinations is established.

[0112] In an optional embodiment, the main-distribution coordination strategy verification includes main network strategy verification and distribution network strategy verification;

[0113] The main network strategy verification includes:

[0114] Step A: If the receiving plant is overloaded after the transfer strategy corresponding to the effective main grid transfer combination is implemented, or the overload phenomenon of the plant to which the overloaded main transformer belongs has not been eliminated, the transfer strategy corresponding to the effective main grid transfer combination is invalid; otherwise, execute step B;

[0115] Step B, obtaining the load curves of the receiving main transformer and the overloaded main transformer within the specified time period in the input parameters, if the load curve within the specified time period generated after the main grid load transferred by the effective main grid transfer combination is superimposed on the receiving main transformer plant station shows an overload phenomenon, or the main grid load is separated from the overloaded main transformer and still has an overload phenomenon within the specified time period, then the transfer strategy corresponding to the effective main grid transfer combination is invalid; otherwise, the transfer strategy corresponding to the effective main grid transfer combination is valid;

[0116] The network distribution strategy verification includes:

[0117] If, after the plant accepts the transfer strategy of the effective distribution network coordinated transfer combination, the current current of any interconnecting feeder in the effective distribution network coordinated transfer combination exceeds the upper limit of the interconnecting feeder current, the transfer strategy of the effective distribution network coordinated transfer combination is invalid; otherwise, if no overload is found in the interconnecting feeder verification, the transfer strategy of the effective distribution network coordinated transfer combination is valid.

[0118] like Figure 3 As shown in the figure, whether the combined strategy can alleviate the current overloaded main transformer problem needs to be verified after the power transfer. The verification process is mainly divided into two parts: the verification of the main network strategy and the distribution network strategy.

[0119] First, according to the 220kV plant and station accepted after the transfer recorded in the search process of the transfer strategy corresponding to the effective main grid transfer combination, first verify whether the accepted 220kV plant and station is overloaded and whether the overload phenomenon of the 220kV plant and station to which the original overloaded main transformer belongs is eliminated. If any 220kV plant and station before and after the transfer is overloaded, the main grid strategy is marked invalid; otherwise, based on the main grid load transferred within the specified time period in the input parameters in the previous step, whether an overload phenomenon occurs after being superimposed on the accepted 220kV plant and station main transformer and separated from the original 220kV plant and station overloaded main transformer, if no overload phenomenon occurs in the historical verification within the specified time period, the transfer strategy corresponding to the effective main grid transfer combination is marked invalid; otherwise, the transfer strategy corresponding to the effective main grid transfer combination is marked valid.

[0120] The load curve verification of the main transformer within the time period is shown in the following table:

[0121]

[0122] When the load value after superposition is greater than the upper capacity limit, the load curve generated in the specified time period after the main grid load transferred by the effective main grid transfer combination is superimposed on the receiving main transformer station as described in step B is overloaded. As shown in the above table, the load values ​​after superposition are all less than the upper capacity limit, indicating that the load curve generated in the specified time period after the main grid load transferred by the effective main grid transfer combination is superimposed on the receiving main transformer station is not overloaded, and the conditions for verification of this main and distribution coordination strategy have been passed.

[0123] Furthermore, the load curve verification of the overloaded main transformer within the time period is shown in the following table:

[0124]

[0125] When the load value after separation is greater than the upper capacity limit, it means that the overload phenomenon still exists within the specified time period after the main grid load is separated from the overloaded main transformer in step B. As shown in the above table, the load values ​​after separation are all less than the upper capacity limit, indicating that there is no overload phenomenon within the specified time period after the main grid load is separated from the overloaded main transformer, and the verification passes, passing the conditions for the verification of the main and distribution coordination strategy.

[0126] When the above two verification conditions do not fail the verification, the transfer strategy corresponding to the effective main network transfer combination is valid, and the main network strategy verification is completed. For the distribution network strategy verification, it is based on the transfer strategy of the effective distribution network coordinated transfer combination and the upper limit of the interconnecting feeder current corresponding to all the transfer loads in the combination. If the current current of any interconnecting feeder in the combination exceeds the upper limit of the current of the interconnecting feeder after the transfer, the distribution network strategy is judged to be invalid and the distribution network strategy verification is exited; otherwise, if the interconnecting feeder verification of all transfer loads is completed and no overload occurs, the distribution network strategy is judged to be valid.

[0127] Based on the main network strategy verification results and the distribution network strategy verification results, if both the main network strategy verification results and the distribution network strategy verification results are valid, the main-distribution coordination combination scheme is marked as a valid scheme; otherwise, the main-distribution coordination combination scheme is marked as an invalid scheme.

[0128] After completing the strategy verification, the verification information of the main and distribution coordination combination scheme is recorded, including the effectiveness of the scheme, the load changes before and after the original overloaded 220kV plant transfer, the load changes before and after the acceptance of the 220kV plant transfer, the switch operation strategy of the scheme, and the load adjusted by the distribution network strategy.

[0129] Restore to the base state flow, return to step S4 to enter the application of the next main and distribution coordination combination strategy, and then perform the main and distribution coordination strategy verification until the combination verification of the current main network strategy and all distribution network strategies is completed.

[0130] In an optional embodiment, step S5 further includes: weighted scoring of the load balancing transfer strategy based on the number of switch operations, the maximum load rate, and the influencing factors of the transferred load conditions to obtain a load balancing transfer strategy score, and adjusting the load balancing transfer strategy according to the load balancing transfer strategy score.

[0131] After completing the above steps, the load balancing transfer based on the overloaded main transformer and the main-distribution coordination mode is finally completed. Example

[0132] Embodiment 2 of the present invention provides a load balancing transfer system considering the main distribution coordination mode, including:

[0133] The initial module is used to generate a base state section for the overloaded main transformer using the initial operation mode of the power grid and the equipment flow data, and to determine the load gap using the initial section;

[0134] A main grid transfer module, used to determine an effective main grid transfer combination based on the load gap, the overloaded main transformer and the base state section;

[0135] The distribution network transfer module is used to traverse the effective main network transfer combinations in turn, and determine the effective distribution network coordinated transfer combination based on the remaining load gap after the load that can be transferred by the main network combination as the improvement target;

[0136] The verification module is used to superimpose the transfer strategy corresponding to the effective main network transfer combination with the transfer strategy of the effective distribution network coordinated transfer combination to form a combined strategy and start the power flow calculation. If the power flow calculation converges, the main and distribution coordinated strategy verification is performed;

[0137] The output module is used to output the load balancing transfer strategy. Example

[0138] Figure 4 A schematic diagram of the structure of an electronic device provided in Embodiment 3 of the present invention is shown in FIG. Figure 4 As shown, the electronic device includes a processor 21, a memory 22, an input device 23 and an output device 24; the number of processors 21 in the computer device can be one or more. Figure 4 A processor 21 is taken as an example; the processor 21, the memory 22, the input device 23 and the output device 24 in the electronic device can be connected by a bus or other means. Figure 4 The example of connecting through bus is taken in the following.

[0139] The memory 22 is a computer-readable storage medium that can be used to store software programs, computer executable programs, and modules. The processor 21 executes various functional applications and data processing of the electronic device by running the software programs, instructions, and modules stored in the memory 22, that is, a load balancing transfer method considering the main distribution coordination mode of embodiment 1 is implemented.

[0140] The memory 22 may mainly include a program storage area and a data storage area, wherein the program storage area may store an operating system and at least one application required for a function; the data storage area may store data created according to the use of the terminal, etc. In addition, the memory 22 may include a high-speed random access memory, and may also include a non-volatile memory, such as at least one disk storage device, a flash memory device, or other non-volatile solid-state storage device. In some instances, the memory 22 may further include a memory remotely arranged relative to the processor 21, and these remote memories may be connected to the electronic device via a network. Examples of the above-mentioned network include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network, and combinations thereof.

[0141] The input device 23 can be used to receive the ID and password input by the user, etc. The output device 24 is used to output the network configuration page. Example

[0142] Embodiment 4 of the present invention further provides a computer-readable storage medium, wherein the computer-executable instructions, when executed by a computer processor, are used to implement a load balancing transfer method in a main-distribution coordination mode as provided in Embodiment 1.

[0143] A storage medium containing computer executable instructions provided in an embodiment of the present invention, wherein the computer executable instructions are not limited to the method operations provided in Example 1, but can also execute related operations in a load balancing transfer method considering the main-distribution coordination mode provided in any embodiment of the present invention.

[0144] The specific implementation methods described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific implementation method of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A load balancing transfer method considering the main distribution coordination mode, characterized in that: The steps include: Step S1, using the initial operation mode of the power grid and the equipment flow data as the overload main transformer to generate a base state section, and using the initial section to determine the load gap; Step S2, determining an effective main grid power transfer combination based on the load gap, the overloaded main transformer and the base state section; Step S3, traverse the effective main grid transfer combinations in turn, and determine the effective distribution network coordinated transfer combination with the remaining load gap after applying the load that can be transferred by the main grid combination as the improvement target; Step S4: superimpose the transfer strategy corresponding to the effective main network transfer combination and the transfer strategy of the effective distribution network coordinated transfer combination to form a combined strategy and start the power flow calculation. If the power flow calculation converges, the main distribution coordinated strategy verification is performed; Step S5, repeating steps S2 to S4 until all valid main grid power transfer combinations are searched and verified, and a load balancing transfer strategy is output; The main and distribution coordination strategy verification includes main network strategy verification and distribution network strategy verification; The main network strategy verification includes: Step A: If the receiving plant is overloaded after the transfer strategy corresponding to the effective main grid transfer combination is implemented, or the overload phenomenon of the plant to which the overloaded main transformer belongs has not been eliminated, the transfer strategy corresponding to the effective main grid transfer combination is invalid; otherwise, execute step B; Step B, obtaining the load curves of the receiving main transformer and the overloaded main transformer within the specified time period in the input parameters, if the load curve within the specified time period generated after the main grid load transferred by the effective main grid transfer combination is superimposed on the receiving main transformer plant station shows an overload phenomenon, or the main grid load is separated from the overloaded main transformer and still has an overload phenomenon within the specified time period, then the transfer strategy corresponding to the effective main grid transfer combination is invalid; otherwise, the transfer strategy corresponding to the effective main grid transfer combination is valid; The network distribution strategy verification includes: If, after the plant accepts the transfer strategy of the effective distribution network coordinated transfer combination, the current current of any interconnecting feeder in the effective distribution network coordinated transfer combination exceeds the upper limit of the interconnecting feeder current, the transfer strategy of the effective distribution network coordinated transfer combination is invalid; otherwise, if no overload is found in the interconnecting feeder verification, the transfer strategy of the effective distribution network coordinated transfer combination is valid.

2. A load balancing transfer method considering the main distribution coordination mode according to claim 1, characterized in that: Determining the load notch using the initial section includes the following steps: Step S11, obtaining the mitigation object sent by the user and performing parameter parsing on the mitigation object to generate input parameters; Step S12, verifying the input parameters according to the overloaded main transformer and the plant information to which the overloaded main transformer belongs; Step S13, determining the active load, capacity upper limit and main transformer regulation margin of the overloaded main transformer at the current section based on the initial section and combined with the verified input parameters; Step S14: Calculate the active load, the capacity upper limit and the main transformer regulation margin to obtain a load gap.

3. The load balancing transfer method considering the main distribution coordination mode according to claim 1 is characterized in that: Determining an effective main grid power supply combination based on the load gap, the overloaded main transformer and the base state section includes the following steps: Step S21: searching the downstream loads connected to the overloaded main transformer through deep topology, wherein the downstream loads include a distribution network load set and a main network load set; Step S22, selecting downstream transferable power plants from the main grid load set to obtain transferable power plants, freely combining the transferable power plants, and enumerating the freely combined transferable power plants to determine the original main grid transfer combination; Step S23, selecting the original main network transfer combination that meets the validity conditions as the valid main network transfer combination; Step S24, traverse the valid main network transfer combinations in sequence, determine the transfer strategies corresponding to the valid main network transfer combinations, and form a transfer strategy mapping relationship.

4. The load balancing transfer method considering the main distribution coordination mode according to claim 3 is characterized in that: The valid conditions include: The transferable load of the original main grid transfer combination is less than the load gap of the overloaded main transformer; and The remaining load gap of the original main grid transfer combination is less than the upper limit of the distribution network transfer load.

5. The load balancing transfer method considering the main distribution coordination mode according to claim 1 is characterized in that: The effective main grid transfer combinations are traversed in turn, and the remaining load gap after the load that can be transferred by the main grid combination is used as the improvement target to determine the effective distribution network coordinated transfer combination, including the following steps: Step S31, obtaining the distribution network connection relationship, searching the downstream load connected to the overloaded main transformer through the deep topology, and determining the transferable load in combination with the distribution network connection relationship; Step S32, defining the original load, traversing the transferable loads and screening to obtain effective distribution network transfer units based on the original loads; Step S33: when there is an effective distribution network transfer combination, traverse the effective distribution network transfer units, and screen the effective distribution network transfer units to obtain an effective distribution network collaborative transfer combination; Step S34, traversing the effective distribution network collaborative transfer combination in sequence, and determining a transferable load mapping relationship set of the effective distribution network collaborative transfer combination; Step S35, traverse the transferable load mapping relationship set to determine the transfer strategy corresponding to the distribution network collaborative transfer combination.

6. The load balancing transfer method considering the main distribution coordination mode according to claim 1 is characterized in that: The step S5 also includes: weighting the load balancing transfer strategy based on the number of switch operations, the maximum load rate, and the influencing factors of the transferred load conditions to obtain a load balancing transfer strategy score, and adjusting the load balancing transfer strategy according to the load balancing transfer strategy score.

7. A load balancing transfer system considering the main distribution coordination mode, characterized in that: include: The initial module is used to generate a base state section for the overloaded main transformer using the initial operation mode of the power grid and the equipment flow data, and to determine the load gap using the initial section; A main grid transfer module, used to determine an effective main grid transfer combination based on the load gap, the overloaded main transformer and the base state section; The distribution network transfer module is used to traverse the effective main network transfer combinations in turn, and determine the effective distribution network coordinated transfer combination based on the remaining load gap after the load that can be transferred by the main network combination as the improvement target; The verification module is used to superimpose the transfer strategy corresponding to the effective main network transfer combination with the transfer strategy of the effective distribution network coordinated transfer combination to form a combined strategy and start the power flow calculation. If the power flow calculation converges, the main and distribution coordinated strategy verification is performed; Output module, used for outputting load balancing transfer strategy; The main and distribution coordination strategy verification includes main network strategy verification and distribution network strategy verification; The main network strategy verification includes: Step A: If the receiving plant is overloaded after the transfer strategy corresponding to the effective main grid transfer combination is implemented, or the overload phenomenon of the plant to which the overloaded main transformer belongs has not been eliminated, the transfer strategy corresponding to the effective main grid transfer combination is invalid; otherwise, execute step B; Step B, obtaining the load curves of the receiving main transformer and the overloaded main transformer within the specified time period in the input parameters, if the load curve within the specified time period generated after the main grid load transferred by the effective main grid transfer combination is superimposed on the receiving main transformer plant station shows an overload phenomenon, or the main grid load is separated from the overloaded main transformer and still has an overload phenomenon within the specified time period, then the transfer strategy corresponding to the effective main grid transfer combination is invalid; otherwise, the transfer strategy corresponding to the effective main grid transfer combination is valid; The network distribution strategy verification includes: If, after the plant accepts the transfer strategy of the effective distribution network coordinated transfer combination, the current current of any interconnecting feeder in the effective distribution network coordinated transfer combination exceeds the upper limit of the interconnecting feeder current, the transfer strategy of the effective distribution network coordinated transfer combination is invalid; otherwise, if no overload is found in the interconnecting feeder verification, the transfer strategy of the effective distribution network coordinated transfer combination is valid.

8. An electronic device, characterized in that: It includes a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, it implements a load balancing transfer method considering the main and distribution coordination mode as described in any one of claims 1 to 6.

9. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, it implements a load balancing transfer method taking into account the main and distribution coordination mode as described in any one of claims 1 to 6.

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