Intelligent decision method for power distribution network topology network oriented to digital twin reconstruction

Abstract

The present application relates to the technical field of power distribution network digital twinning and power distribution automation, and discloses an intelligent decision-making method for a power distribution network topology network facing digital twinning reconstruction, comprising: determining a switch boundary reconstruction area under the same voltage level according to an existing topology account and a switch state; aligning a transfer switch event with voltage sampling to form a voltage calculation period before switch action and a voltage calculation period after switch action; determining a regional common voltage component according to a standard voltage of an effective voltage measuring point and obtaining voltage deviation data; determining a continuous transfer line section and a transfer boundary according to voltage deviation data changes of a user voltage measuring point relative to an original side reference voltage measuring point and a target side reference voltage measuring point; correcting power supply attribution of a user or a branch, generating a local reconstruction topology and a switch state combination, and outputting a reconstruction topology network graph and a switch state table. The present application is used for topology reconstruction and switch state decision-making in a power distribution network transfer scenario.

Description

Technical Field

[0001] This invention relates to the fields of distribution network digital twins and distribution automation, and more specifically, to an intelligent decision-making method for distribution network topology reconfiguration oriented towards digital twins. Background Technology

[0002] In distribution network operation and management, digital twin topology networks typically need to be connected to ledger systems, geographic information systems (GIS), distribution automation master stations, feeder terminals, smart meters, and dispatch records. Ledger systems and GIS provide registration of line segments, switching equipment, distribution transformers, user access points, and phases; distribution automation master stations and feeder terminals provide remote signaling and operating status of switches; smart meters provide voltage sampling on the user side; and dispatch records provide information on switching, power transfer, and maintenance operations. After the above data is aggregated at the master station, edge devices, or dispatch support systems, it can be used to generate distribution network topology relationships, user power supply attribution, phase registration verification results, and switch operation suggestions.

[0003] In medium- and low-voltage distribution areas containing distributed photovoltaic (PV) systems, user-side voltage is affected not only by changes in the load of the local line but also by PV output, cloud shadow movement, upstream bus voltage adjustments, reactive power compensation equipment operation, and changes in the operating modes of adjacent lines. For multiple lines laid in the same trench, erected on the same pole, or with adjacent routes, user voltage curves for different feeders and different phases may exhibit similar changes within the same time period. If the topology is corrected solely based on the similarity of user voltage curves, single clustering results, or network-wide correlation results, it is easy to misclassify spatially adjacent user access points to the same feeder or the same phase, thereby affecting user power supply assignment and switch status determination.

[0004] During the power transfer process in a distribution network, the time granularity of switch remote signaling, dispatch records, and smart meter voltage sampling is inconsistent. Switch status changes are typically recorded by distribution automation equipment with a time granularity down to the second level; user voltage sampling is often uploaded at minute intervals; and dispatch records may also be affected by manual input, system synchronization, and communication links. If the switch event time, voltage sampling time, and reference measurement point time are not processed uniformly, the voltage changes before and after switch action may not correspond to the actual power transfer process, leading to deviations in the determination of power supply attribution for local line segments.

[0005] In actual operation, power transfer operations typically only change the power source of a portion of the line segment and do not necessarily alter the ownership of the entire adjacent feeder. For areas adjacent to switch blocks, ring main units, sectionalizing switches, and tie switches, if a full-network topology search is used to handle the uncertainty of local switch states, the impact of local power transfer may be extended to other feeder segments. This could result in the reconstructed topology meeting connectivity or radial operation requirements, but the power transfer boundary not matching the on-site wiring. This type of deviation will propagate to load transfer calculations, end-point voltage verification, line current carrying capacity verification, transformer load assessment, and photovoltaic absorption analysis, affecting the selection results of switch state combinations.

[0006] Therefore, in the digital twin reconstruction and switch status decision-making of distribution networks, it is necessary to combine ledger relationships, switch status, voltage sampling, and dispatch records to process voltage data within the local electrical scope related to the current power transfer operation. It is also necessary to distinguish between regional common voltage changes and changes in the user's measuring point relative to reference measuring points on both sides of the switch, and to use these changes to identify continuous power transfer line segments and power transfer boundaries. Through this type of processing, user power supply attribution correction, topology network updates, and switch status combinations can be generated based on the correspondence between distribution network operating equipment and field-collected data, rather than solely relying on voltage curve similarity. Summary of the Invention

[0007] This invention provides an intelligent decision-making method for distribution network topology reconfiguration based on digital twins, which solves the technical problems mentioned in the background art.

[0008] This invention provides an intelligent decision-making method for distribution network topology reconfiguration based on digital twins, configured to execute: Based on the existing topology ledger and switch status, determine the switch boundary reconstruction area containing switch equipment and adjacent line segments under the same voltage level, and establish an initial local topology relationship diagram; Acquire the power transfer switch event, align the power transfer switch event with the voltage sampling, and form a voltage calculation period before switch action and a voltage calculation period after switch action; Within the reconstructed boundary region of the switch, the common voltage component of the region is determined based on the per-unit voltage of the effective voltage measurement point, and the common voltage component of the region is subtracted to obtain voltage deviation data; Based on the voltage deviation data of the user voltage measurement point relative to the original side reference voltage measurement point and the target side reference voltage measurement point, the transfer boundary judgment data is obtained; Based on the transfer boundary judgment data, the continuous transfer line segment and transfer boundary are determined, and the power supply attribution of users or branches within the continuous transfer line segment is corrected to obtain a local reconstructed topology. Based on the locally reconstructed topology, switch state combinations are generated, and the reconstructed topology network diagram and switch state table are output.

[0009] Preferably, determining the switch boundary reconstruction region and establishing the initial local topology graph includes: Obtain device identifiers, connection nodes, line segments, user access points, switch conduction status, and user phase registrations from the existing topology ledger and the switch status; Starting from the original side sectionalizing switch and the target side tie switch, search outwards along the conductive line segments on both sides until reaching the next switchgear, feeder boundary point or preset electrical distance boundary of the same voltage level. The obtained device identifiers, connection nodes, line segments, user access points, switch conduction status, voltage measurement points, and user phase registrations are incorporated into the switch boundary reconstruction region, and the initial local topology diagram is established.

[0010] Preferably, aligning the power supply switching event with voltage sampling includes: Obtain the power transfer switch event confirmed by scheduling permission or operation records; Determine the opening time of the original side sectionalizing switch and the closing time of the target side tie switch based on the switch remote signaling, operation ticket, dispatch log or terminal event record; The opening time of the primary side segment switch, the closing time of the target side tie switch, and the sampling time of the voltage sampling are unified to the same time reference; Before the power transfer switch event, a time period in which the switch state remains unchanged and the voltage sampling time is continuous is selected as the voltage calculation period before the switch action. After the power transfer switch event, a time period in which the switch state remains unchanged and the voltage sampling time is continuous is selected as the voltage calculation period after the switch action.

[0011] Preferably, obtaining the voltage deviation data includes: Select voltage measurement points corresponding to the same voltage level from the reconstructed area of ​​the switch boundary; The effective voltage measurement points are obtained by removing voltage measurement points that have missing samples, whose sampling times are not unified to the same time reference, have sampling dead zones, have abnormal user phase registration, or cannot be converted to the same voltage level. The voltage samples taken at the effective voltage measurement point during the voltage calculation period before the switch action and the voltage calculation period after the switch action are normalized to obtain the per-unit voltage. The common voltage component of the region is obtained by performing a common voltage estimation on the per-unit voltage at the sampling time, and the voltage deviation data is obtained by subtracting the common voltage component of the region from the per-unit voltage.

[0012] Preferably, obtaining the transfer boundary judgment data includes: Select the voltage measurement point corresponding to the user access point from the effective voltage measurement points as the user voltage measurement point, and select the voltage measurement point that maintains the same power supply ownership before and after the occurrence of the power transfer switch event as the original side reference voltage measurement point and the target side reference voltage measurement point. Calculate the average voltage deviation of the user voltage measurement point relative to the original side reference voltage measurement point and the target side reference voltage measurement point during the voltage calculation period before the switch action and the voltage calculation period after the switch action, respectively. The boundary change amplitude and the direction of power supply ownership change are determined based on the average voltage deviation value, and the boundary change amplitude and the direction of power supply ownership change are used as the transfer boundary judgment data.

[0013] Preferably, determining the continuous transfer line segment and the transfer boundary includes: The user voltage measurement points are arranged according to the line branch hierarchy in the initial local topology diagram, and the order of voltage measurement points within the same branch is determined by combining geographical information path, cable direction, path length, well location sequence or service connection line location. The boundary change amplitude is sequentially determined along the voltage measurement points to determine whether it reaches the judgment threshold, and the direction of the power supply change is consistent. The continuous user voltage measurement points whose boundary change amplitude reaches the determination threshold and whose power supply ownership change direction is consistent are identified as the transfer measurement point group. The line segments corresponding to the transfer measurement point group are merged into the continuous transfer line segments, and the connection position between the continuous transfer line segments and the unmerged line segments is identified as the transfer boundary.

[0014] Preferably, obtaining the locally reconstructed topology includes: In the initial local topology diagram, the upstream connection of the continuous feeder segment is adjusted from the original feeder side to the target feeder side; The user access sequence, line branch relationship, branch impedance parameters and user phase registration within the continuous power transfer line segment shall remain unchanged; For branches without voltage measurement points, the upstream power supply ownership is determined based on the nearest upstream switching equipment, the downstream power supply ownership is determined based on the nearest downstream effective voltage measurement point, and the power supply ownership of the branch is determined based on line continuity and the branch's level. When the upstream power supply attribution and the downstream power supply attribution are inconsistent, the branch is marked as a branch to be verified on-site, and the local reconfigured topology is generated based on the adjusted upstream connection, user access sequence, line branch relationship, branch impedance parameters, user phase registration, power supply attribution of the branch, and the branch to be verified on-site.

[0015] Preferably, generating the switch state combination includes: Based on the local reconstructed topology, candidate switch state combinations are generated by enumerating the open and closed states of existing operable switches or by topology search. The candidate switch state combinations are subjected to topology security verification and operational security verification. The topology security verification includes loop verification, islanding verification, cross-phase access verification, and radial operation mode verification. The operational security verification includes three-phase power flow verification, voltage over-limit verification, line current carrying verification, transformer load verification, distributed photovoltaic power output scenario verification, and load transfer amount verification. Candidate switch state combinations that pass the topology security check and the operation security check are determined as feasible switch state combinations. The feasible switch state combinations are then sorted according to the number of switch changes, active power loss, load rate difference of each feeder, number of voltage over-limit measurement points, photovoltaic curtailment, and number of affected important users to obtain the switch state combination.

[0016] Preferably, outputting the reconstructed topology network diagram and the switch state table includes: The reconstructed topology network diagram is generated based on the local reconstructed topology and the switch state combination, and the power supply ownership, user phase registration, power transfer boundary, branch to be verified on site and branch without voltage measurement points are marked in the reconstructed topology network diagram; The switch state table is generated based on the switch state combination, and the switch state table lists the switch devices involved in the decision, the current state, the target state, the operation sequence, and the verification result. When there is no candidate switch state combination that passes both the topology security check and the operational security check, an infeasibility prompt, an on-site verification prompt, or a prompt to expand the switch boundary reconstruction area is output.

[0017] Compared with existing methods, the advantages of the present invention are as follows: This invention confines distribution network topology reconfiguration to the switch boundary reconfiguration area under the same voltage level. It utilizes existing topology ledgers, switch states, voltage sampling, and scheduling records to form an executable data processing link. By deducting the common voltage component of the region, it reduces the combined impact of photovoltaic output, cloud shadow changes, and upstream voltage adjustments on the voltage curves of parallel lines. By comparing the voltage deviation data changes of user voltage measurement points relative to the original side reference voltage measurement point and the target side reference voltage measurement point, it determines the continuous transfer line segments and transfer boundaries, and generates switch state combinations on the locally reconfigured topology. This enables the reconfigured topology network diagram, switch state table, user power supply attribution, and user phase registration to form a corresponding relationship based on the same distribution network operation data. This helps reduce switch decision deviations caused by line segment attribution offsets during load balancing, photovoltaic absorption, and voltage over-limit handling. Attached Figure Description

[0018] Figure 1 This is a schematic diagram illustrating the data processing and module relationships of the present invention; Figure 2 This is a schematic diagram of the switch boundary reconstruction area and continuous transfer line segment identification of the present invention. Detailed Implementation

[0019] The subject matter described herein will now be discussed with reference to exemplary embodiments. It should be understood that these embodiments are discussed only to enable those skilled in the art to better understand and implement the subject matter described herein, and changes may be made to the function and arrangement of the elements discussed without departing from the scope of this specification. Various processes or components may be omitted, substituted, or added as needed in the examples. Furthermore, features described in some examples may be combined in other examples.

[0020] Figure 1 Used to represent the data processing relationships of intelligent decision-making systems Figure 2 This is used to represent the correspondence between switch boundary reconfiguration area, continuous transfer line segment, non-transfer line segment, transfer boundary, branch without voltage measurement point, and branch to be verified on site.

[0021] The technical processing in each embodiment is constrained by the same voltage level, and voltage measurement points of different voltage levels are not directly mixed and compared.

[0022] Example 1:

[0023] like Figure 1 As shown, the intelligent decision-making system includes a processor 100, a memory 110, a data access module 120, a topology range determination module 130, an event alignment module 140, a voltage processing module 150, a boundary judgment module 160, a topology correction module 170, a switch decision module 180, and a result output module 190. The memory 110 stores programs and execution records that can be called by the processor 100; when the processor 100 calls a program from the memory 110, the data access module 120, topology range determination module 130, event alignment module 140, voltage processing module 150, boundary judgment module 160, topology correction module 170, switch decision module 180, and result output module 190 execute in the order of the data flow.

[0024] The data access module 120 accesses the existing topology ledger 210, switch status data 220, voltage sampling data 230, and dispatch records 240. The existing topology ledger 210 includes registration of line segments, switching equipment, distribution transformers, user access points, connection nodes, and user phases. The switch status data 220 includes equipment identification, switch on / off status, and acquisition time. The voltage sampling data 230 includes voltage measurement points, sampling time, and voltage sampling. The dispatch records 240 include power transfer switch events, operation tickets, dispatch logs, or terminal event records.

[0025] The data access module 120 uses the device identifier as the basis for corresponding data between the existing topology ledger 210, switch status data 220, voltage sampling data 230, and scheduling record 240. When the names of the same switchgear are inconsistent across multiple data sources, device code matching is given first priority; devices with completely identical codes from different data sources are directly identified as the same switchgear. When device codes are missing or inconsistent, installation location matching is given second priority, provided the geographical coordinate deviation of the installation location does not exceed [a certain threshold]. Furthermore, if the equipment types are consistent, they are considered to be the same switchgear; if the equipment code and installation location cannot be matched, the connection node matching is the third priority. If the connection node numbers at both ends are completely consistent and the equipment types are consistent, they are considered to be the same switchgear; if the records cannot be matched in any of the three dimensions, they are marked as branch-related information to be verified on-site and will not participate in the automatic addition of connection relationships.

[0026] The topology range determination module 130 determines the switch boundary reconstruction region 420 based on the existing topology ledger 210 and switch status data 220, and establishes an initial local topology relationship diagram. The event alignment module 140 obtains the transfer switch events based on the scheduling record 240, and aligns the transfer switch events with voltage sampling to form the voltage calculation period before switch action and the voltage calculation period after switch action. The voltage processing module 150 obtains the per-unit voltage, regional common voltage component, and voltage deviation data based on the voltage sampling data 230. The boundary judgment module 160 obtains the transfer boundary judgment data based on the voltage deviation data changes of the user voltage measurement point relative to the original side reference voltage measurement point and the target side reference voltage measurement point. The topology correction module 170 determines the continuous transfer line segment and transfer boundary based on the transfer boundary judgment data, and generates a local reconstruction topology. The switch decision module 180 generates switch state combinations based on the local reconstruction topology. The result output module 190 outputs the reconstructed topology network diagram 310 and the switch status table 320.

[0027] like Figure 2As shown, the reconstructed boundary region 420 covers the original feeder 400, the target feeder 410, the original side sectionalizing switch 430, the target side tie switch 440, and adjacent line segments. The original side reference voltage measurement point 450 is located on the original feeder 400 side, and the target side reference voltage measurement point 460 is located on the target feeder 410 side. User voltage measurement points 501, 502, 503, and 504 participate in the acquisition of transfer boundary judgment data according to the voltage measurement point order in the initial local topology diagram. The connection position between the continuous transfer line segment 480 and the non-transfer line segment 490 is the transfer boundary 530. The non-transfer line segment 490 is treated as an unmerged line segment. The branch 510 without configured voltage measurement points and the branch 520 to be verified on-site are marked in the reconstructed topology network diagram 310. The power supply assignment adjustment direction 540 is used to indicate the direction of power supply assignment change. Parallel line segment 470 is used to represent line segments that are spatially adjacent but whose data are not merged into continuous transfer line segment 480 based on the transfer boundary.

[0028] Example 2:

[0029] The topology range determination module 130 retrieves equipment identifiers, connection nodes, line segments, user access points, switch conduction status, and user phase registration from the existing topology ledger and switch status. Equipment identifiers correspond to switchgear, line segments, distribution transformers, and user access points. Connection nodes indicate the wiring endpoints between equipment. Line segments indicate the electrical connections between adjacent connection nodes. User access points indicate the location of the user's access line segment. Switch conduction status indicates the opening and closing status of the switchgear at the current operating moment. User phase registration indicates the phase corresponding to the user access point.

[0030] The determination of the switch boundary reconstruction region is based on the same voltage level as the boundary condition. The topology range determination module 130 reads the voltage level corresponding to each line segment and user access point, and puts the data of different voltage levels into different processing batches. When the distribution transformer connects the medium-voltage side and the low-voltage side, the distribution transformer is retained as the power flow boundary information transmission point, and the voltage measurement points of the medium-voltage side and the low-voltage side are not directly mixed and compared.

[0031] like Figure 2 As shown, the topology range determination module 130 uses the original side sectionalizing switch 430 and the target side tie switch 440 as the search starting point, and searches outwards along the conductive line segments on both sides until it reaches the next switchgear, feeder boundary point, or preset electrical distance boundary of the same voltage level. The preset electrical distance boundary is set with a default value according to the typical network structure of the same voltage level. When the number of line segments is the first constraint, the default is to start from the original side sectionalizing switch 430 and the target side tie switch 440 and search outwards along the conductive line segments for the maximum number of segments. Line segment; when the cumulative line segment length is used as the second constraint, the default cumulative search length does not exceed [the specified value]. When the search path encounters a feeder boundary point or a switchgear in a tripped state, the search in that direction is terminated directly and the search does not continue to extend outward.

[0032] For scenarios involving a common busbar segment within a switchgear or ring main unit, the topology range determination module 130 includes all switchgear connected to the common busbar segment in the initial search starting point set and performs a unified outward search. The identification of a common busbar segment simultaneously meets three conditions: the ring main unit number and the switchgear number to which multiple switchgear belong are completely identical in their ledger information; the connection node numbers on one side of the multiple switchgear are completely identical; and the common connection node is not connected to a user access point, not connected to a distribution transformer, and is only connected to one side of the aforementioned switchgear terminals. Connection nodes that meet the above conditions and their corresponding busbar segments within the cabinet are determined to be common busbar segments.

[0033] The topology range determination module 130 incorporates the searched equipment identifiers, connection nodes, line segments, user access points, switch conduction status, voltage measurement points, and user phase registrations into the switch boundary reconstruction area and establishes an initial local topology graph. The initial local topology graph uses connection nodes and user access points as nodes, and line segments and the connection relationships between switchgear as edges. Each edge records its associated line segment, the two connecting nodes, whether it contains switchgear, switch conduction status, line impedance parameters, and voltage level. Each node records its equipment identifier, node type, feeder side, whether a voltage measurement point is configured, user phase registration, and geographical path location.

[0034] The initial local topology diagram does not add or delete connections based on voltage curve similarity. If the geographic information path shows that two user access points are spatially close, but are connected to different line segments in the existing topology ledger, then an independent connection relationship is still established according to the existing topology ledger. If the existing topology ledger lacks a short line segment, but the switch status and geographic information path both show that it is located between two known connection nodes, then this short line segment is retained as a branch to be verified on-site in the initial local topology diagram, and is marked accordingly as a branch to be verified on-site 520 in the reconstructed topology network diagram 310.

[0035] The length threshold for short line segments is The existing topology ledger contains missing nodes located between two known connected nodes with a path length not exceeding [a certain value]. The line segment was identified as a short line segment and retained in the initial local topology diagram as a branch awaiting on-site verification. The judgment logic for proving the existence of a short line segment based on switch status and geographic information path is as follows: if two known connection nodes have a continuous passable power channel in the geographic information path, and the switchgear connected to the two connection nodes has a synchronous state correlation during operation, that is, after one switch is opened, the load current of the other switch shows a matching incremental change, then it is determined that there is a short line segment with missing records between the two known connection nodes.

[0036] The identification of parallel line segments simultaneously satisfies three conditions: the average spatial distance between the geographic information paths of the two line segments does not exceed [a certain value]. The included angle between the two line segments is less than 1. Two line segments belong to different feeder sides or different branch levels in the existing topology ledger and are not directly connected through the same connection node. Line segments that meet the above conditions are determined to be parallel line segments. Even if they are spatially adjacent, they are not directly merged into the continuous transfer line segment. Only when the user voltage measurement points on the parallel line segment form transfer boundary judgment data consistent with the transfer measurement point group will the corresponding line segment be included in the continuous transfer line segment.

[0037] The line branch hierarchy is calculated using a breadth-first search algorithm, starting from the connection node where the original side sectionalizing switch 430 and the target side tie switch 440 are located. The hierarchy of the connection node where the two switches are located is denoted as... The level is increased by traversing outwards along the connected line segment, and each time a connection node that does not connect to other branches is encountered, the level increases. When encountering a branch connection node that connects multiple branch line segments, the hierarchy in the trunk line direction continues from the current hierarchy and increases. The hierarchy of all branch lines is increased based on the current hierarchy. As the next level branch, when encountering a switchgear or feeder boundary point in the open state during the traversal, the hierarchical calculation in that direction is terminated, and finally a unified line branch hierarchy is formed for the entire area.

[0038] Within the same branch, the priority of user voltage measurement points is determined from highest to lowest as follows: accepted geographical information path, cable route and well location sequence, service connection line location, line segment length and connection node sequence, user number sequence, and distance to the nearest upstream switchgear. When valid data exists for a high-priority criterion, that criterion is used directly to determine the user voltage measurement point sequence, and lower-priority criteria are not included in the sorting. When a high-priority criterion is missing, the next lower priority criterion is automatically used to determine a temporary sequence. Branches that use user number sequence and distance to the nearest upstream switchgear to determine a temporary sequence are automatically marked as branches awaiting on-site verification.

[0039] Example 3:

[0040] The event alignment module 140 acquires transfer switch events that have been authorized by the dispatching authority or confirmed by the operation record. Transfer switch events can be provided by dispatching records, operation tickets, distribution automation master station event records, feeder terminal event records, or field maintenance records. When reading a transfer switch event, the event alignment module 140 records the event number, switchgear, operation type, operation request time, operation authorization time, actual change time, and record source.

[0041] For cases where multiple records exist for the same power transfer operation, the event alignment module 140 merges them based on the switching equipment and the actual change time. If multiple records can be identified as the same operation by the switching equipment, operation type, and actual change time, they are grouped into the same power transfer switch event; if they cannot be identified as the same operation, they are formed into different event batches. The time criterion for determining instantaneous remote signaling change is that after the switch remote signaling changes, within... If the change process automatically recovers to its original state within a sampling period, and there is no corresponding operation ticket, scheduling record, or terminal event record to support it, the remote signaling change record that meets this condition is marked as an abnormal state and will not be included in the generation process of the voltage calculation period before and after the switch action; if the change duration exceeds Each sampling period, even without other supporting records, is retained as a switch event to be verified and is not directly marked as an abnormal state.

[0042] The event alignment module 140 determines the opening time of the primary side sectionalizing switch and the closing time of the target side tie switch based on the switch remote signaling, operation ticket, scheduling log, or terminal event record. The opening time of the primary side sectionalizing switch is preferentially determined by the actual change in position of the switch remote signaling from closed to open. The closing time of the target side tie switch is preferentially determined by the actual change in position of the switch remote signaling from open to closed. If the switch remote signaling is missing, the change time in the terminal event record is used; if the terminal event record is also missing, the execution time in the operation ticket is used, and the event batch is marked as having low time accuracy.

[0043] The event alignment module 140 unifies the opening time of the primary side sectionalizing switch, the closing time of the target side tie switch, and the sampling time of the voltage sample to the same time base. This same time base can be the time of the distribution automation master station or the unified time of the dispatch support system. For the voltage samples uploaded by the smart meters, the event alignment module 140 reads the sampling time and the data entry time, and determines the stability of the offset between the sampling time and the data entry time.

[0044] The stability judgment rule for the offset between the sampling time and the storage time is as follows: for the continuous data uploaded by the smart meter... Each voltage sample is analyzed, and the offset between the sampling time and the entry time is calculated for each sample point. This process is represented as follows: ; ; ; in, Indicates the first The offset between the sampling time and the entry time of each voltage sample. Indicates the first The entry time of each voltage sample. Indicates the first The sampling time of each voltage sample express The average of the offsets. If all offsets satisfy... If the offset remains stable, the sampling time is directly used as the calculation basis; if the offset has a fixed systematic deviation, that is, the difference between all offsets and the average value satisfies the above stability condition but the average value is not zero. Then all sampling times are corrected according to the terminal's time synchronization record. This will then serve as the basis for calculation; if the offset fluctuation does not meet the above stability conditions, the voltage sample corresponding to the terminal will not be included in the effective voltage measurement point set.

[0045] The event alignment module 140 selects a time period before the power transfer switch event where the switch state remains unchanged and the voltage sampling times are continuous as the voltage calculation period before the switch action. After the power transfer switch event, it selects a time period after the switch action where the switch state remains unchanged and the voltage sampling times are continuous as the voltage calculation period after the switch action. "Switch state unchanged" means that the switching devices participating in the topology change within the switch boundary reconstruction area maintain the same switch-on state within the corresponding time period. "Continuous voltage sampling times" means that the interval between adjacent sampling times does not exceed [a certain value]. One sampling period.

[0046] When selecting the voltage calculation period before the switch action, exclude the time before the actual change time of the power transfer switch event. Continuous sampling points; when selecting the voltage calculation period after switch action, the actual change time of the power transfer switch event is excluded. Continuous sampling points are used to avoid the influence of electromagnetic transients and capacitor charging / discharging processes on voltage sampling during switching operations. If the number of consecutive valid sampling points is insufficient after this exclusion... If a certain number of events occur, an on-site verification prompt will be output, and this event batch will not be directly used for generating switch state combinations.

[0047] Example 4:

[0048] The voltage processing module 150 filters voltage measurement points corresponding to the same voltage level from the switch boundary reconfiguration area. For medium-voltage side measurement points and low-voltage side measurement points, the voltage processing module 150 processes them separately according to the voltage level; when a voltage measurement point is located on the low-voltage side of the distribution transformer, but the switch boundary reconfiguration area belongs to the medium-voltage side, the voltage measurement point is not directly included in the comparison of the same voltage level. For distribution terminals that only provide line voltage, if they can be converted to phase voltage according to the equipment wiring method and are consistent with the user's phase registration, they are included in the processing; if they cannot be converted to the same voltage level, they are rejected.

[0049] The voltage processing module 150 removes voltage measurement points with missing samples, sampling times not unified to the same time base, sampling dead zones, abnormal user phase registration, or those that cannot be converted to the same voltage level, thus obtaining valid voltage measurement points. Missing samples are counted separately for the voltage calculation period before and after the switch action; a missing rate exceeding [a certain threshold] is considered valid. Voltage measurement points were removed. Single missing points with variations between adjacent sampling points not exceeding [a certain threshold]. In such cases, the average value of adjacent sampling points can be used to supplement the data. Abnormal user phase registration includes inconsistent phase registrations for the same user access point in different systems, three-phase users lacking three-phase access identifiers, and single-phase users having empty phases.

[0050] In determining the sampling dead zone, the criterion for judging that the voltage sampling value remains unchanged is that the per-unit voltage difference of six or more consecutive sampling points satisfies the following: ; in, Indicates effective voltage measurement point At sampling time per-unit voltage, Indicates effective voltage measurement point At sampling time per-unit voltage, Indicates from the sampling time The sampling point number starts from the beginning. The criterion for judging normal fluctuations between adjacent voltage measurement points within the same time period is: the electrical distance between the voltage measurement point and the measurement point does not exceed [a certain value]. Among the adjacent effective voltage measurement points of the line segment, there are at least The per-unit voltage range of each effective voltage measuring point within the same time period is greater than The range is expressed as: ; in, Indicates adjacent effective voltage measurement points Per-unit voltage range within the same time period This indicates the same time period used for determining the sampling dead zone. Indicates adjacent effective voltage measurement points At sampling time The per-unit voltage. If both the voltage sampling value remains unchanged and there are normal fluctuations between adjacent voltage measurement points within the same time period are met, the voltage measurement point is determined to have a sampling dead zone and will not be included in the subsequent set of valid voltage measurement points.

[0051] The voltage processing module 150 normalizes the voltage samples from the effective voltage measurement points during the voltage calculation period before and after the switch action to obtain the per-unit voltage. For any effective voltage measurement point... and sampling time The per-unit voltage is expressed as: ; in, Indicates effective voltage measurement point At sampling time per-unit voltage, Indicates effective voltage measurement point At sampling time Voltage sampling, Indicates effective voltage measurement point The rated value corresponding to the voltage level. If multiple phases are sampled at the same effective voltage measurement point during the voltage calculation period before or after the switch operation, and the user's phase registration is single phase, then only the per-unit voltage corresponding to the user's phase registration will be retained.

[0052] If there is no valid voltage sampling data for the phase corresponding to the user's phase registration, first check if there are voltage samples for other phases at the user's access point; if there are other phase samples and the phase registration error is confirmed through phase correlation detection, then the voltage sample of the actual matching phase is temporarily used for calculation, and a phase verification prompt is marked; if there are no other phase samples, or the phase registration error cannot be confirmed, then the voltage measurement point is marked as an invalid measurement point and is not included in the generation of transfer boundary judgment data.

[0053] The voltage processing module 150 performs common voltage estimation on the per-unit voltage according to the sampling time, obtaining the regional common voltage component. Common voltage estimation is performed on a unit basis at the same sampling time, without mixing per-unit voltages from different sampling times. The number of effective voltage measurement points is no less than [number missing]. When the median is used, the common voltage component of the region is determined. This process is expressed as: ; in, Indicates the sampling time The common voltage component of the region, Indicates the sampling time The set of effective voltage measurement points that participate in the common voltage estimation. Indicates effective voltage measurement point Belongs to the set of effective voltage measurement points When the number of effective voltage measurement points is odd, the median is the per-unit voltage at the middle position after sorting; when the number of effective voltage measurement points is even, the median is the average of the two middle per-unit voltages after sorting.

[0054] When the number of effective voltage measurement points is less than When there are no stable busbar measuring points or feeder head-end measuring points on the same side within the switch boundary reconfiguration area, the calculation range of the common voltage component of the area is automatically expanded, extending outwards from the switch boundary reconfiguration area along the same voltage level, and the measurement range is expanded to include the component closest to the boundary of the reconfiguration area. Each stable voltage measurement point is included in a common voltage estimation set, and the regional common voltage component is calculated using the median method; if the set still cannot be fully formed after expansion... If there are 10 effective measurement points, the average value of all effective measurement points is used as the common voltage component of the region, and the common voltage calculation accuracy is marked as insufficient in the operation record.

[0055] The voltage processing module 150 obtains voltage deviation data by subtracting the common voltage component of the region at the same sampling time from the per-unit voltage. This processing is represented as follows: ; in, Indicates effective voltage measurement point At sampling time The voltage deviation data. If the voltage deviation data continuously exceeds [a certain value], [the following will occur]. If a sudden change occurs, the voltage processing module 150 checks whether there is a large load start / stop or sampling abnormality at the corresponding voltage measurement point.

[0056] The identification of high-load start-up and shutdown simultaneously meets three characteristics: the duration of the sudden change in voltage deviation data does not exceed After one sampling period, the voltage deviation data recovers to the fluctuation range before the mutation; all user voltage measurement points under the same connection node show voltage mutations in the same direction; the user load data for the corresponding time period shows matching records of high-power load input or output. Voltage mutations that meet the above characteristics are determined to be caused by high load start-up and shutdown, and are not considered sampling anomalies; if only a single user voltage measurement point shows a mutation, and other measurement points at the same node do not change synchronously, it is determined to be a sampling anomaly, and the corresponding sampling time is removed as an abnormal sampling point.

[0057] The phase difference reflected by user phase registration and voltage sampling is achieved through correlation detection of voltage deviation data. For three-phase voltage sampling at the same user access point, the correlation coefficient between the voltage deviation data of each phase and the voltage deviation data of the known phase voltage measurement point upstream of the branch is calculated. The correlation coefficient between the user phase registration and the corresponding phase is denoted as... The correlation coefficient of the other phase is denoted as .like And there exists another phase that satisfies If there is a discrepancy between the user's phase registration and the phase reflected by the voltage sampling, the user's phase registration will not be directly modified during the reconstruction process. Instead, a phase verification label will be given in the reconstructed topology network diagram 310.

[0058] Example 5:

[0059] The boundary judgment module 160 selects the voltage measurement point corresponding to the user access point from the effective voltage measurement points as the user voltage measurement point, and selects the voltage measurement point that maintains the same power supply affiliation before and after the power transfer switch event as the original side reference voltage measurement point and the target side reference voltage measurement point. For example... Figure 2 As shown, the primary reference voltage measurement point 450 is located on the primary feeder 400 side, the target reference voltage measurement point 460 is located on the target feeder 410 side, and the user voltage measurement points 501, 502, 503 and 504 participate in the calculation according to the correspondence between the user access point and the line segment.

[0060] The primary and target reference voltage measurement points are screened for stability. The boundary judgment module 160 statistically analyzes the sampling loss rate of candidate reference voltage measurement points during the voltage calculation period before and after the switching action; the sampling loss rate is no higher than [a certain percentage]. Candidate reference voltage measurement points are retained; then the voltage deviation data fluctuations of the candidate reference voltage measurement points are statistically analyzed, and the difference between the maximum and minimum values ​​does not exceed [a certain value]. Candidate reference voltage measurement points are selected as either the original-side or target-side reference voltage measurement points. If the stability of a single reference voltage measurement point is insufficient, at least [number missing] points on the same side are selected. The average value of the reference voltage measurement points on the same side is formed by averaging the values ​​at the same sampling time.

[0061] When the number of stable reference voltage measurement points on the primary or target side is insufficient At this time, the stability screening threshold is automatically lowered, reducing the threshold for the difference between the maximum and minimum values ​​of voltage deviation data fluctuations from [previous threshold]. Relaxed to The sampling missing rate threshold is from Relaxed to Candidate reference voltage measurement points are re-screened; if no reference voltage measurement point meets the conditions after relaxing the threshold, the outgoing voltage measurement point at the beginning of the feeder is used as the reference voltage measurement point on the corresponding side, and the instability of the reference measurement point is marked in the operation record. When the result is output, a reference measurement point degradation prompt is output simultaneously.

[0062] The boundary judgment module 160 calculates the average voltage deviation of the user voltage measurement point relative to the original side reference voltage measurement point and the target side reference voltage measurement point during the voltage calculation period before and after the switch action. For the user voltage measurement point... and reference voltage measurement point The average voltage deviation before and after the action are expressed as follows: ; ; in, Indicates user voltage measurement point Relative to the reference voltage measurement point during the voltage calculation period before switching action The average voltage deviation value, Indicates user voltage measurement point Relative to the reference voltage measurement point during the voltage calculation period after the switch action The average voltage deviation value, This represents the set of sampling times retained during the voltage calculation period before the switch action. This represents the set of sampling times retained during the voltage calculation period after the switch action. express The number of sampling times retained within the time frame. express The number of sampling times retained within the time frame. Indicates the reference voltage measurement point At sampling time Voltage deviation data. If there are outlier sampling points that have been removed, only the retained sampling points are used when averaging; if the number of retained sampling points is less than... At this time, the user's voltage measurement point does not participate in the generation of power transfer boundary judgment data.

[0063] The boundary judgment module 160 determines the boundary change amplitude and the direction of power supply ownership change based on the average voltage deviation value. The original side reference voltage measurement point is denoted as... The target-side reference voltage measurement point is denoted as The anterior-lateral difference, posterior-lateral difference, and boundary variation range are expressed as follows: ; ; ; in, Indicates the primary side reference voltage measurement point. Indicates the reference voltage measurement point on the target side. Indicates user voltage measurement point The difference in movement on the front side, Indicates user voltage measurement point Differences in the action after the side, Indicates user voltage measurement point The magnitude of boundary changes. If This indicates the user's voltage measurement point. During the voltage calculation period before the switch action, the voltage measurement point is closer to the original side reference voltage; if This indicates the user's voltage measurement point. During the voltage calculation period before the switch action, the voltage is closer to the target-side reference voltage measurement point. If This indicates the user's voltage measurement point. During the voltage calculation period after the switch action, the voltage measurement point is closer to the target side reference voltage point; if This indicates the user's voltage measurement point. During the voltage calculation period after the switch is activated, the voltage measurement point is closer to the original side reference voltage.

[0064] The threshold for judgment is denoted as Determination threshold The settings are adaptively configured based on the statistical results of boundary change amplitudes of historical power transfer events under the same voltage level. For user voltage measurement points involved in the calculation, the boundary change amplitudes of user voltage measurement points that did not experience changes in power supply affiliation during the voltage calculation period before and after the switch action are taken. Quantiles are used as the baseline value. When no available historical statistical results are available, the default value is used. When the number of effective voltage measurement points within the same switch boundary reconfiguration area is insufficient At that time, take The threshold calculation process uses only stable user voltage measurement data that do not change the power supply assignment before and after the switch action, and does not introduce user voltage measurement data of the user to be judged at the transfer boundary, so as to avoid threshold deviation.

[0065] when , and At that time, the direction of power supply change is from the original feeder side to the target feeder side. , and When the power supply assignment changes, the direction is adjusted from the target feeder side to the original feeder side. ,or and When the same power supply change direction cannot be pointed to simultaneously, the power supply change direction is recorded as an unstable direction. Data for determining the power supply boundary is recorded on a per-user voltage measurement point basis, and includes at least the user access point, boundary change magnitude, power supply change direction, and the number of sampling points involved in the calculation.

[0066] Example 6:

[0067] The boundary judgment module 160 arranges user voltage measurement points according to the line branch hierarchy in the initial local topology diagram, and determines the order of voltage measurement points within the same branch by combining geographical information such as path, cable direction, path length, well location sequence, or service connection line location. The line branch hierarchy is calculated from the connection node where the original side sectionalizing switch 430 and the target side tie switch 440 are located, and is arranged step by step along the line segment. The main line segment is the higher level, the branch line segment is the next level, and the user access point is attached to the corresponding line segment.

[0068] The establishment of the user voltage measurement point sequence does not depend on the similarity of voltage curves. If two user voltage measurement points are spatially adjacent but belong to different line branch levels, they are sorted within their respective branches. If the geographic information path and cable route are inconsistent, the accepted geographic information path is given priority; if the geographic information path is missing, the line segment length and connection node sequence are used; if location data is missing within the same branch, a temporary sequence is determined based on the service connection location, user number sequence, and the nearest upstream switchgear, and the corresponding branch is marked as a branch to be verified on-site.

[0069] The boundary judgment module 160 sequentially judges whether the boundary change amplitude reaches the judgment threshold along the voltage measurement points, and judges whether the power supply ownership change direction is consistent. User voltage measurement points whose boundary change amplitude reaches the judgment threshold and whose power supply ownership change direction is not unstable are included in the candidate transfer measurement points. When the power supply ownership change direction of adjacent candidate transfer measurement points is consistent, they are assigned to the same transfer measurement point group; if the power supply ownership change direction of adjacent user voltage measurement points is opposite, the current transfer measurement point group is terminated at that position.

[0070] like Figure 2 As shown, when the boundary changes of user voltage measurement points 501, 502, and 503 reach the judgment threshold and the power supply ownership change direction is consistent, a transfer measurement point group is formed; the line segments corresponding to the transfer measurement point group are merged into continuous transfer line segments 480. If user voltage measurement point 504 does not reach the judgment threshold, or the power supply ownership change direction is inconsistent with the transfer measurement point group, the line segment corresponding to user voltage measurement point 504 is not merged, forming a non-transfer line segment 490. The connection position between continuous transfer line segment 480 and non-transfer line segment 490 is determined as the transfer boundary 530.

[0071] When the voltage measurement points of adjacent users do not reach the judgment threshold, but there are no other branches on the corresponding line segment and the power supply ownership change direction of the upstream and downstream candidate transfer measurement points is consistent, the boundary judgment module 160 allows... A number of invalid point intervals are identified, and these intervals are marked as insufficient sampling. When consecutive invalid points appear along the user voltage measurement point sequence... If there are invalid measurement points that do not meet the judgment threshold or whose power supply direction is unstable, and if the power supply direction of the candidate transfer measurement points upstream and downstream of the invalid measurement point is completely consistent, and the line segment corresponding to the invalid measurement point has no other branch lines or disconnected switching equipment, then continuous measurement is allowed. If there are multiple invalid measurement points, the interval is marked as insufficient sampling, and the corresponding line segment is still included in the continuous transfer line segment; if the number of consecutive invalid measurement points exceeds... If there are no valid measurement points or branch lines at the location of the invalid measurement point, the current transfer measurement point group will be terminated at the first invalid measurement point location, and subsequent measurement points will not be included in the scope of this continuous transfer line segment.

[0072] The length threshold of the terminal short branch is The path length from the user access point to the nearest upstream connected node does not exceed Furthermore, branches with no other user access points or branch lines downstream are identified as terminal short branches. In the terminal short branch scenario, the nearest downstream effective voltage measurement point refers to the first effective voltage measurement point searched downstream from the connection node between the terminal short branch and the main line along the power supply direction, not the measurement point downstream of the terminal short branch user access point; when the boundary change amplitude of the user voltage measurement point of the terminal short branch reaches the judgment threshold... When the upstream nearest switching equipment is in a closed state and the power supply change direction of the first effective voltage measurement point downstream is consistent with that of the user measurement point, the line segment of the corresponding terminal short branch will be included in the continuous transfer line segment.

[0073] If the upstream nearest switchgear supports the same power supply assignment change direction, it means that the target state of the switchgear after this transfer switch event is closed, which can provide a power supply path from the target feeder side to the continuous transfer line segment, or the state of the switchgear matches the adjusted power supply assignment of the continuous transfer line segment and will not block the adjusted power supply path; if the upstream nearest switchgear is in the open state, and the open position is located on the connection path between the continuous transfer line segment and the target feeder side, it is determined that the switch does not support the corresponding power supply assignment change direction.

[0074] Even if parallel line segment 470 is spatially adjacent to continuous transfer line segment 480, it will not be directly merged due to geographical proximity. Only when the user voltage measurement point on parallel line segment 470 forms transfer boundary judgment data consistent with the transfer measurement point group will the boundary judgment module 160 include the line segment corresponding to parallel line segment 470 into continuous transfer line segment 480; otherwise, parallel line segment 470 retains its original power supply affiliation and is marked in the reconstructed topology network diagram 310 according to the original feeder side or the target feeder side.

[0075] Example 7:

[0076] In the initial local topology diagram, the topology correction module 170 adjusts the upstream connection of the continuous power transfer line segment from the original feeder side to the target feeder side. If the power supply assignment change direction is from the original feeder side to the target feeder side, the power supply assignment relationship between the continuous power transfer line segment and the upstream connection node of the original feeder side is disconnected, and the power supply assignment relationship between the continuous power transfer line segment and the connection node of the target feeder side is established. If the power supply assignment change direction is from the target feeder side to the original feeder side, the process is reversed.

[0077] Upstream connection adjustments only change the power supply attribution and the topology direction corresponding to the switch conduction state; they do not change the equipment identification, line segment number, or user access point number of the continuous power transfer line segment. If the continuous power transfer line segment in the initial local topology diagram already has a backup connection with the target feeder 410 via the target-side tie switch 440, then in the local topology reconstruction, the closed state of the target-side tie switch 440 is taken as the target state, and the open state of the original-side sectionalizing switch 430 is taken as the target state. If multiple target-side tie switches exist, the target-side tie switch recorded in the power transfer switch event record is selected first; if not specified in the record, the switch with the shortest electrical distance to the continuous power transfer line segment and which passes the topology safety verification is selected.

[0078] The topology correction module 170 maintains the user access sequence, line branch relationship, branch impedance parameters, and user phase registration within the continuous power transfer line segment unchanged. If there is a difference between the user phase registration and the phase reflected by voltage sampling after a power transfer switch event, the topology correction module 170 does not directly modify the user phase registration, but instead provides a branch or phase verification mark to be verified on-site in the reconstructed topology network diagram 310.

[0079] If branch impedance parameters are missing within a continuous power transfer line segment, the impedance parameters of a line segment of the same type or those from historical acceptance records should be used, and the branch impedance parameter should be marked as pending verification. When there are neither measured impedance parameters nor impedance parameters of a line segment of the same type or impedance parameters from historical acceptance records available for reference, the typical unit length impedance parameter of an overhead line or cable line of the same voltage level should be used, combined with the line segment length, to calculate the branch impedance parameter. The typical unit length impedance of an overhead line is taken as... The typical impedance per unit length of a cable line is taken as Branches calculated using typical parameters are automatically marked as impedances to be checked, which does not affect subsequent topology security checks and operational security checks.

[0080] For branches without voltage measurement points, the topology correction module 170 determines the upstream power supply assignment based on the nearest upstream switchgear, the downstream power supply assignment based on the nearest effective voltage measurement point, and the branch's power supply assignment based on line continuity and the branch's hierarchical level. The power supply assignment determination for branches without voltage measurement points uses a hierarchical transfer rule. First, it checks whether there are disconnected switchgear, feeder boundary points, or equipment of different voltage levels between the branch and the continuous transfer line segment. If such isolation equipment exists, the original power supply assignment is directly retained. If no such isolation equipment exists, it then checks whether the direction of change of the power supply assignment of the nearest effective voltage measurement point downstream of the branch is consistent with the transfer measurement point group. If consistent, the branch is assigned to the continuous transfer line segment; otherwise, the original power supply assignment is retained. When the upstream and downstream power supply assignments are inconsistent, the branch is directly marked as a branch awaiting on-site verification, and its power supply assignment is not automatically determined.

[0081] like Figure 2 As shown, if there are no disconnected switching equipment, feeder boundary points, or equipment of different voltage levels between the branch 510 without a voltage measuring point and the continuous transfer line segment 480, and the power supply ownership change direction of the nearest downstream effective voltage measuring point is consistent with that of the transfer measuring point group, then the branch 510 without a voltage measuring point is assigned to the continuous transfer line segment 480; if they are inconsistent, the original power supply ownership is retained and marked as branch 520 to be verified on site.

[0082] When the upstream and downstream power supply affiliations are inconsistent, the topology correction module 170 marks the branch as a branch to be verified on-site. Based on the adjusted upstream connections, user access sequence, line branch relationships, branch impedance parameters, user phase registration, the power supply affiliation of the branch, and the branch to be verified on-site, a partially reconstructed topology is generated. The partially reconstructed topology retains the equipment identification, connection nodes, line segments, user access points, switch conduction status, voltage measurement points, and user phase registration within the reconstructed area of ​​the switch boundary. It also records the transfer boundary, conflict location, upstream power supply affiliation, downstream power supply affiliation, and the involved user access points.

[0083] Example 8:

[0084] The switch decision module 180, based on the local reconfiguration topology, generates candidate switch state combinations by enumerating the open / closed states of existing operable switches or through topology search. Existing operable switches refer to switchgear included in the switch boundary reconfiguration area, possessing scheduling operation authority, not under maintenance interlock, having valid remote control capabilities, and related to the current power transfer switch event. The switch decision module 180 reads the current state, permitted operation mode, adjacent connection nodes, and voltage level of each existing operable switch.

[0085] The switchgear related to this power transfer switch event must meet two conditions: the switchgear is located within the switch boundary reconfiguration area; and the state change of the switchgear can alter the power supply path of the continuous power transfer line segment, or the switchgear is located on the connection path between the continuous power transfer line segment and the original feeder side or the target feeder side. Switchgear that does not meet the above conditions, even if located within the switch boundary reconfiguration area, will not be included in the scope of operable switches and will not participate in the generation of candidate switch state combinations.

[0086] Candidate switch state combinations are generated using a topology path search method, with the transfer boundary as the core. The search scope is limited to existing operable switches within the switch boundary reconfiguration area. The switch decision module 180 first enumerates all switch open positions that can achieve continuous transfer line segment power allocation adjustment, and then enumerates corresponding switch closed positions that can provide power supply paths to continuous transfer line segments. Each open position and its corresponding closed position form a candidate switch state combination. During the enumeration process, switch combinations that would create cross-voltage level connections or cause maintenance equipment to become energized are automatically excluded and do not proceed to the subsequent verification process.

[0087] The candidate switch state combination includes the switching equipment involved in the decision-making, the current state, the target state, and the operation sequence. One possible implementation is as follows: first, determine the switching equipment that needs to be disconnected based on the local reconfiguration topology, and then determine the switching equipment that needs to be closed; when loop closing is not allowed on site, the operation sequence is set to first disconnect the original side sectionalizing switch, and then close the target side tie switch; when short-term loop closing is allowed on site and the loop verification and line current carrying capacity verification pass in the short-term state, the operation sequence is set to first close the target side tie switch, and then disconnect the original side sectionalizing switch. Each candidate switch state combination corresponds to the transfer boundary in the local reconfiguration topology.

[0088] The allowable duration of short-time loop closure is After the loop-closing operation, the original side sectionalizing switch must be disconnected within this time frame; prolonged loop-closing operation is not permitted. The line current carrying capacity verification under short-time loop-closing conditions uses the short-time allowable current carrying capacity of the line segment, taking the rated continuous current carrying capacity. The short-time loop closure verification is deemed to have passed when the calculated current under the closed loop condition does not exceed the short-time allowable current carrying value. When this condition is met, the operation sequence of first closing the target side tie switch and then opening the original side sectionalizing switch is allowed.

[0089] The switch decision module 180 performs topology safety verification and operational safety verification on candidate switch state combinations. Topology safety verification includes loop verification, islanding verification, cross-phase access verification, and radial operation mode verification. Loop verification checks whether there is a closed electrical loop formed by a closed switch and a conducting line segment in the topology corresponding to the switch state combination. The verification scope covers all line segments and switchgear with the same voltage level within the switch boundary reconfiguration area. Islanding verification is completed by checking whether each user access point can be connected to the original feeder side or the target feeder side connection node along the conducting line segment. Cross-phase access verification is completed by comparing the user phase registration, line segment phase, and switchgear phase. Radial operation mode verification checks the number of power supply paths from each user access point to the power source point, ensuring that each user access point has only one valid power supply path. The verification scope covers all user access points included in the switch boundary reconfiguration area. Loop verification focuses on the existence of loops, while radial operation mode verification focuses on the uniqueness of power supply paths, and there is no duplicate verification.

[0090] Operational safety verification includes three-phase power flow verification, voltage over-limit verification, line current carrying capacity verification, transformer load verification, distributed photovoltaic (PV) output scenario verification, and load transfer verification. Three-phase power flow verification reads the local reconfigured topology, user load, distributed PV output, and branch impedance parameters, and calculates the operational data of connection nodes and line segments. Line current carrying capacity verification determines whether a line segment exceeds its limit based on its rated continuous current carrying capacity. Transformer load verification determines whether the distribution transformer exceeds its limit based on its rated capacity. Distributed PV output scenario verification determines whether the switch state combination meets operational requirements based on the acquired distributed PV output scenario. Load transfer verification calculates the total user load transferred from the original feeder side to the target feeder side or from the target feeder side to the original feeder side.

[0091] In voltage over-limit verification, the operating limit for the corresponding voltage level is taken as the rated voltage. arrive The range, i.e., the per-unit voltage satisfies or If the voltage exceeds the limit, it is determined to be out of limit. If the local dispatching regulations have stricter voltage operation requirements for a specific power supply area, the limit value specified in the dispatching regulations shall be used to replace the default limit value, and the source of the limit value shall be retained in the operation record.

[0092] When user load data is missing, the rated capacity of the distribution transformer at the user access point is used. As a typical load value, the power factor is taken as... Perform three-phase power flow calculations; when distributed photovoltaic power output data is missing, use the corresponding installed capacity. As a typical output value of distributed photovoltaic power, the power factor is taken as... Perform three-phase power flow calculations; power flow verification results completed using typical data are marked as insufficient in accuracy, and the data source is simultaneously marked as typical value in switch status table 320 to remind operators to verify.

[0093] The switch decision module 180 determines the candidate switch state combinations that have passed topology security verification and operational security verification as feasible switch state combinations. It then sorts these feasible switch state combinations according to the number of switch changes, active power loss, load rate difference between feeders, number of voltage over-limit measurement points, photovoltaic curtailment, and number of affected important users. When sorting feasible switch state combinations, all indicators are arranged in ascending order of smaller values. The comparison rules are as follows: the first level compares the number of switch changes, with combinations having fewer changes ranking higher; if the number of changes is the same, the second level compares active power loss, with combinations having lower active power loss ranking higher; if active power loss is the same, the third level compares the load rate difference between feeders, with combinations having lower load rate difference ranking higher; if the load rate difference is the same, the next level compares the number of voltage over-limit measurement points, photovoltaic curtailment, and number of affected important users, with smaller values ​​ranking higher for each of these three indicators. The final ranked combination is the output switch state combination.

[0094] The amount of curtailed photovoltaic (PV) power is calculated using power flow calculations. For each switching state combination and its corresponding operating scenario, the voltage of all distributed PV grid-connected points and the current carrying capacity of the line segment where the grid-connected point is located are calculated. If the grid-connected point voltage exceeds the upper voltage limit, or the current carrying capacity of the line segment where the grid-connected point is located exceeds the rated continuous current carrying capacity, the output of the corresponding distributed PV is reduced proportionally to the excess value. The product of the output reduction of all distributed PV and the duration is accumulated to obtain the amount of curtailed PV power corresponding to that switching state combination. When there is no reduction, the curtailed PV power is recorded as follows: .

[0095] Important users are directly extracted from the user level field of the existing topology ledger. User access points marked as Level 1 or Level 2 loads in the existing topology ledger are identified as important users, including government agencies, hospitals, schools, public transportation hubs, and important industrial users. User access points without load level markings in the existing topology ledger are uniformly classified as ordinary users and are not included in the number of affected important users. However, if the operation corresponding to the switch state combination causes a power outage for an important user, it will be included in the number of affected important users.

[0096] Example 9:

[0097] The output module 190 generates a reconstructed topology network diagram 310 based on the combination of the local reconstructed topology and switch status. The reconstructed topology network diagram 310 marks the power supply attribution, user phase registration, transfer boundaries, branches awaiting on-site verification, and branches without voltage measurement points. The reconstructed topology network diagram 310 is generated based on the connection nodes, line segments, switchgear, and user access points in the local reconstructed topology. Power supply attribution is marked as the original feeder side, target feeder side, or pending on-site verification. User phase registration is displayed according to the existing topology ledger records. Transfer boundaries are marked at the connection points between continuous transfer line segments and unmerged line segments.

[0098] The result output module 190 generates a switch state table 320 based on the switch state combinations, and lists the participating switch devices, current state, target state, operation sequence, and verification results in the switch state table 320. The participating switch devices are existing operable switches from the locally reconstructed topology. The current state is read from the switch states. The target state is given by the switch state combinations. The operation sequence is output according to the order recorded in the switch state combinations, including open, closed, and unchanged. The verification results include topology safety verification results and operational safety verification results.

[0099] Switch status table 320 records the pass / fail status and cause of any abnormality for each verification result. If a candidate switch status combination is eliminated due to loop failure, the switching equipment and line segment forming the loop are recorded. If a candidate switch status combination is eliminated due to islanding failure, the user access point that lost its power supply path is recorded. If a candidate switch status combination is eliminated due to voltage over-limit failure, the number of voltage over-limit measurement points and the corresponding line segment are recorded. If a candidate switch status combination is eliminated due to transformer load failure, the relevant distribution transformer on the target feeder side is recorded.

[0100] When no candidate switch state combinations pass both topology safety and operational safety checks, the result output module 190 outputs an infeasibility warning, a field verification warning, or a warning to expand the switch boundary reconstruction area. The infeasibility warning is triggered when all candidate switch state combinations fail either topology safety or operational safety checks, and there are no characteristics of sampling anomalies, data conflicts, or insufficient range. The field verification warning is triggered when there are branches awaiting field verification, the sampling missing rate exceeds the limit, the time base is abnormal, the phase registration is abnormal, or the proportion of sampling dead zone measurement points exceeds the limit. Data quality issues prevent the formation of stable data for determining power supply boundaries. The trigger condition for expanding the switch boundary reconstruction area is that all candidate switch state combinations are eliminated due to disconnected power supply paths and insufficient current carrying capacity, and a feasible power supply path exists after expanding outward along the same voltage level.

[0101] When outputting prompts, the result output module 190 simultaneously retains the local reconstructed topology, transfer boundary judgment data, continuous transfer line segments, candidate switch state combinations, and verification failure reasons. Infeasibility prompts include the failure type and the identification of the involved equipment. On-site verification prompts include branches awaiting on-site verification, missing voltage measurement points, abnormal user access points registered for user phases, and abnormal time base records. Prompts to expand the switch boundary reconstructed area provide suggested expansion directions.

[0102] When expanding the switch boundary reconstruction area, the expansion direction is preferentially along three directions: the extension direction of the continuous transfer line segment, the direction opposite to the target side tie switch 440, and the power supply side direction of the original side sectionalizing switch 430. Expansion is not carried out in branch directions unrelated to the transfer path. The step size of each expansion is to search along the expansion direction to the next switchgear or feeder boundary point in the open state. The newly searched line segment, switchgear, and user access point are included in the new switch boundary reconstruction area, and all subsequent data processing procedures are re-executed.

[0103] Example 10:

[0104] Figure 1 In this system, processor 100 and memory 110 are used to carry out the data processing. Existing topology ledger 210, switch status data 220, voltage sampling data 230, and scheduling record 240 serve as inputs to data access module 120. Data access module 120, topology range determination module 130, event alignment module 140, voltage processing module 150, boundary judgment module 160, topology correction module 170, switch decision module 180, and result output module 190 process the data in the order of the data flow. Result output module 190 forms a reconstructed topology network diagram 310 and a switch status table 320.

[0105] Figure 2 In this system, the original feeder 400, target feeder 410, switch boundary reconfiguration area 420, original side sectionalizing switch 430, and target side tie switch 440 define the local electrical scope of the transfer switch event. Original side reference voltage measurement point 450, target side reference voltage measurement point 460, user voltage measurement point 501, user voltage measurement point 502, user voltage measurement point 503, and user voltage measurement point 504 participate in the generation of transfer boundary judgment data. Parallel line segment 470 is used to represent line segments that are spatially adjacent but not directly merged. Continuous transfer line segment 480, non-transfer line segment 490, and transfer boundary 530 correspond to the updated positions of the local reconfigured topology. Branch 510 without configured voltage measurement points and branch 520 awaiting on-site verification are used to output on-site verification prompts. Power supply attribution adjustment direction 540 is used to indicate the direction of power supply attribution change.

[0106] The above embodiments can be combined and applied according to the integrity of operating data, the type of power supply switch event, and the voltage sampling quality. After the processor 100 calls the program in the memory 110, the data access module 120, the topology range determination module 130, the event alignment module 140, the voltage processing module 150, the boundary judgment module 160, the topology correction module 170, the switch decision module 180, and the result output module 190 are executed in the above order.

[0107] The embodiments of this example have been described above. However, this example is not limited to the specific implementation methods described above. The specific implementation methods described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms based on the guidance of this example, and all of them are within the protection scope of this example.

Claims

1. An intelligent decision-making method for distribution network topology reconfiguration based on digital twins, characterized in that, Configured for execution: Based on the existing topology ledger and switch status, determine the switch boundary reconstruction area containing switch equipment and adjacent line segments under the same voltage level, and establish an initial local topology relationship diagram; Acquire the power transfer switch event, align the power transfer switch event with the voltage sampling, and form a voltage calculation period before switch action and a voltage calculation period after switch action; Within the reconstructed boundary region of the switch, the common voltage component of the region is determined based on the per-unit voltage of the effective voltage measurement point, and the common voltage component of the region is subtracted to obtain voltage deviation data; Based on the voltage deviation data of the user voltage measurement point relative to the original side reference voltage measurement point and the target side reference voltage measurement point, the transfer boundary judgment data is obtained, including: Select the voltage measurement point corresponding to the user access point from the effective voltage measurement points as the user voltage measurement point, and select the voltage measurement point that maintains the same power supply ownership before and after the occurrence of the power transfer switch event as the original side reference voltage measurement point and the target side reference voltage measurement point. Calculate the average voltage deviation of the user voltage measurement point relative to the original side reference voltage measurement point and the target side reference voltage measurement point during the voltage calculation period before the switch action and the voltage calculation period after the switch action, respectively. The boundary change amplitude and the power supply ownership change direction are determined based on the average voltage deviation value, and the boundary change amplitude and the power supply ownership change direction are used as the transfer boundary judgment data; Based on the transfer boundary judgment data, the continuous transfer line segment and transfer boundary are determined, and the power supply attribution of users or branches within the continuous transfer line segment is corrected to obtain a local reconstructed topology. The user voltage measurement points are arranged according to the line branch hierarchy in the initial local topology diagram, and the order of voltage measurement points within the same branch is determined by combining geographical information path, cable direction, path length, well location sequence or service connection line location. The boundary change amplitude is sequentially determined along the voltage measurement points to determine whether it reaches the judgment threshold, and the direction of the power supply change is consistent. The continuous user voltage measurement points whose boundary change amplitude reaches the judgment threshold and whose power supply ownership change direction is consistent are determined as the transfer measurement point group. The line segments corresponding to the transfer measurement point group are merged into the continuous transfer line segments, and the connection position between the continuous transfer line segments and the unmerged line segments is determined as the transfer boundary. Based on the locally reconstructed topology, switch state combinations are generated, and the reconstructed topology network diagram and switch state table are output.

2. The intelligent decision-making method for distribution network topology reconfiguration based on digital twins as described in claim 1, characterized in that, Determining the switch boundary reconstruction region and establishing the initial local topology graph includes: Obtain device identifiers, connection nodes, line segments, user access points, switch conduction status, and user phase registrations from the existing topology ledger and the switch status; Starting from the original side sectionalizing switch and the target side tie switch, search outwards along the conductive line segments on both sides until reaching the next switchgear, feeder boundary point or preset electrical distance boundary of the same voltage level. The obtained device identifiers, connection nodes, line segments, user access points, switch conduction status, voltage measurement points, and user phase registrations are incorporated into the switch boundary reconstruction region, and the initial local topology diagram is established.

3. The intelligent decision-making method for distribution network topology reconfiguration based on digital twins according to claim 2, characterized in that, Aligning the power supply switching event with voltage sampling includes: Obtain the power transfer switch event confirmed by scheduling permission or operation records; Determine the opening time of the original side sectionalizing switch and the closing time of the target side tie switch based on the switch remote signaling, operation ticket, dispatch log or terminal event record; The opening time of the primary side segment switch, the closing time of the target side tie switch, and the sampling time of the voltage sampling are unified to the same time reference; Before the power transfer switch event, a time period in which the switch state remains unchanged and the voltage sampling time is continuous is selected as the voltage calculation period before the switch action. After the power transfer switch event, a time period in which the switch state remains unchanged and the voltage sampling time is continuous is selected as the voltage calculation period after the switch action.

4. The intelligent decision-making method for distribution network topology reconfiguration based on digital twins according to claim 3, characterized in that, Obtaining the voltage deviation data includes: Select voltage measurement points corresponding to the same voltage level from the reconstructed area of ​​the switch boundary; The effective voltage measurement points are obtained by removing voltage measurement points that have missing samples, whose sampling times are not unified to the same time reference, have sampling dead zones, have abnormal user phase registration, or cannot be converted to the same voltage level. The voltage samples taken at the effective voltage measurement point during the voltage calculation period before the switch action and the voltage calculation period after the switch action are normalized to obtain the per-unit voltage. The common voltage component of the region is obtained by performing a common voltage estimation on the per-unit voltage at the sampling time, and the voltage deviation data is obtained by subtracting the common voltage component of the region from the per-unit voltage.

5. The intelligent decision-making method for distribution network topology reconfiguration based on digital twins according to claim 4, characterized in that, Obtaining the local reconstructed topology includes: In the initial local topology diagram, the upstream connection of the continuous feeder segment is adjusted from the original feeder side to the target feeder side; The user access sequence, line branch relationship, branch impedance parameters and user phase registration within the continuous power transfer line segment shall remain unchanged; For branches without voltage measurement points, the upstream power supply ownership is determined based on the nearest upstream switching equipment, the downstream power supply ownership is determined based on the nearest downstream effective voltage measurement point, and the power supply ownership of the branch is determined based on line continuity and the branch's level. When the upstream power supply attribution and the downstream power supply attribution are inconsistent, the branch is marked as a branch to be verified on-site, and the local reconfigured topology is generated based on the adjusted upstream connection, user access sequence, line branch relationship, branch impedance parameters, user phase registration, power supply attribution of the branch, and the branch to be verified on-site.

6. The intelligent decision-making method for distribution network topology reconfiguration based on digital twins according to claim 5, characterized in that, Generating the switch state combination includes: Based on the local reconstructed topology, candidate switch state combinations are generated by enumerating the open and closed states of existing operable switches or by topology search. The candidate switch state combinations are subjected to topology security verification and operational security verification. The topology security verification includes loop verification, islanding verification, cross-phase access verification, and radial operation mode verification. The operational security verification includes three-phase power flow verification, voltage over-limit verification, line current carrying verification, transformer load verification, distributed photovoltaic power output scenario verification, and load transfer amount verification. Candidate switch state combinations that pass the topology security check and the operation security check are determined as feasible switch state combinations. The feasible switch state combinations are then sorted according to the number of switch changes, active power loss, load rate difference of each feeder, number of voltage over-limit measurement points, photovoltaic curtailment, and number of affected important users to obtain the switch state combination.

7. The intelligent decision-making method for distribution network topology reconfiguration based on digital twins according to claim 6, characterized in that, Outputting the reconstructed topology network diagram and the switch state table includes: The reconstructed topology network diagram is generated based on the local reconstructed topology and the switch state combination, and the power supply ownership, user phase registration, power transfer boundary, branch to be verified on site and branch without voltage measurement points are marked in the reconstructed topology network diagram; The switch state table is generated based on the switch state combination, and the switch state table lists the switch devices involved in the decision, the current state, the target state, the operation sequence, and the verification result. When there is no candidate switch state combination that passes both the topology security check and the operational security check, an infeasibility prompt, an on-site verification prompt, or a prompt to expand the switch boundary reconstruction area is output.

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