Overhauling control method and system for secondary equipment of intelligent substation

Abstract

The invention discloses an intelligent substation secondary equipment maintenance control method and system, and relates to the technical field of secondary equipment maintenance control, and the method comprises the following steps: obtaining first data of a substation to construct a static matrix, and generating a dynamic topological graph; determining the security level of the controlled equipment according to the dynamic topological graph, and establishing a priority table of mapping of the equipment type and the security level; detecting concurrent instruction conflicts through a priority table, identifying an N-order virtual loop based on a dynamic topological graph, generating a minimum isolation set, and outputting a virtual terminal isolation instruction sequence with timing constraint according to a signal level; and when the state of the maintenance pressing plate or the GOOSE link is changed, the affected equipment is positioned based on the static matrix, and incremental updating of the dynamic topological graph is controlled according to the instruction sequence. According to the method, the path optimization strategy based on the cross-interval coefficient is matched with the time window constraint, so that the maintenance efficiency is guaranteed, potential safety hazards caused by disordered operation time sequences are avoided, and the maintenance process is standardized and intelligent.

Description

Technical Field

[0001] The present invention relates to the technical field of secondary equipment maintenance, and more specifically, to a method and system for controlling the maintenance of secondary equipment in an intelligent substation. Background Art

[0002] With the continuous development of the power system and the progress of technology, intelligent substations have gradually become an important part of the power system. Intelligent substations adopt advanced intelligent hardware devices, integrated automatic control technology, unconventional transformer technology, and network communication technology, etc., to achieve digital informatization and have higher operation safety and reliability.

[0003] However, compared with traditional substations, the maintenance of secondary equipment in intelligent substations faces many new challenges. In intelligent substations, data is transmitted through optical fibers, and devices are connected through optical fiber communication links. The secondary circuit and hard pressure plate are transformed into "virtual circuits" and "soft pressure plates", making the originally intuitive maintenance objects become "virtualized", increasing the complexity and difficulty of maintenance. At the same time, there are a large number of soft pressure plates in intelligent substations. Manual inspection and verification not only have a large workload but also are prone to omissions, and it is difficult to detect hidden dangers such as incorrect input or withdrawal of soft pressure plates in a timely manner, which may lead to protection tripping accidents and expand the scope of accident impact.

[0004] In addition, in the maintenance working conditions of primary and secondary equipment, accurate operations need to be performed on various soft pressure plates, such as withdrawing the SV receiving soft pressure plate and GOOS sending and receiving soft pressure plates of the maintenance equipment in the operating equipment. However, the implementation of maintenance operation safety measures requires high professional qualities of operation and maintenance personnel, and there is a lack of effective verification means. In recent years, there have been many accidents such as incorrect or incomplete implementation of safety protection measures, resulting in protection maloperation and refusal to operate, which have caused serious harm to the safe and stable operation of the power grid.

[0005] For example, a safety anti-misoperation method and device for the operation and maintenance objects of secondary equipment in an intelligent substation disclosed in the invention patent announcement with the publication number of CN106292499B belongs to the technical field of integrated automation of intelligent substations in the power system. First, for the operation and maintenance objects of secondary equipment that need to be operated, a secondary operation sequence ticket is edited and generated, and each operation step of the generated secondary operation sequence ticket is associated with relevant locking logics; then, according to the relevant signals and status quantities of the secondary equipment, the online monitoring of the operation and maintenance operation status of the secondary equipment for each step of the operation is carried out according to the operation sequence ticket; finally, according to the anti-misoperation locking conditions associated with the operation and maintenance objects of the secondary equipment and the real-time status of the associated equipment, real-time verification of anti-misoperation locking is carried out through logical condition calculation. Through the above process, the present invention realizes the safety anti-misoperation of the operation and maintenance objects of secondary equipment and ensures the intuitive visualization and closed-loop safety completion of the entire operation and maintenance process.

[0006] For example, an automatic identification device for hardware boards of secondary equipment in an intelligent substation announced in the invention patent announcement with the announcement number of CN209014945U includes a hardware identification controller logic module, a hardware scanning logic module, and a hardware terminal identification logic module; the hardware identification controller logic module includes a communication interface, a serial port RS232 transmission module, an identification control module, a data upload control module, and an identification data acquisition module, the hardware scanning logic module includes an on-board 3-8 decoder and a hardware interface, and the hardware terminal identification logic module includes an identification data output circuit and an identification ID memory; this utility model can plug and play hardware boards and reduce the number of spare parts.

[0007] In the above disclosed technical solution, there are at least the following technical problems: The existing control strategy relies on static predefined rules (such as "isolating virtual circuits one by one during single-device maintenance"), but when multiple devices are under parallel maintenance and there are cross-correlations in virtual circuits (such as two protection devices sharing the SV data of the same merging unit), the traditional method cannot dynamically identify the real-time dependency relationship of virtual circuits.

[0008] In view of the above problems, the present invention proposes a solution. Summary of the Invention

[0009] In order to overcome the above defects of the prior art, an embodiment of the present invention provides a maintenance control method and system for secondary equipment in an intelligent substation. By establishing a mapping priority table of device types and safety levels based on a dynamic topology diagram, combined with signal types and the importance of devices, conflict detection and intelligent sorting of concurrent maintenance instructions are realized to solve the problem that the traditional method cannot dynamically identify the real-time dependency of virtual circuits.

[0010] To achieve the above object, the present invention provides the following technical solutions: A maintenance control method for secondary equipment in an intelligent substation includes the following steps: constructing a static matrix based on the first data of the substation and generating a dynamic topology diagram; determining the safety level of the controlled device according to the dynamic topology diagram, establishing a priority table for mapping device types and safety levels, and detecting conflicts in concurrent instructions; if there are conflicts in concurrent instructions, then perform incremental update of the dynamic topology diagram. The incremental update steps include: identifying N-order virtual circuits based on the dynamic topology diagram, generating a minimum isolation set, and outputting a virtual terminal isolation instruction sequence with timing constraints according to the signal level; when the state of the maintenance pressure plate or the GOOSE link changes, locate the affected devices based on the static matrix and control the incremental update of the dynamic topology diagram according to the instruction sequence.

[0011] In a preferred embodiment, constructing a static matrix based on the first substation data and generating a dynamic topology map specifically includes: obtaining the first substation data and respectively constructing a static matrix and a dynamic data vector; fusing the static matrix and the dynamic data vector to construct a directed graph with status annotations having devices as nodes and virtual loops as directed edges, thereby forming a dynamic topology map.

[0012] In a preferred embodiment, determining the safety level of the controlled device according to the dynamic topology map and establishing a priority table for mapping device types to safety levels specifically includes: classifying the maintenance devices into different types according to the SCD file; evaluating the safety level of the controlled device based on the virtual loop connection relationship and signal type between the maintenance device and the controlled device in the dynamic topology map to determine the safety level of the controlled device; establishing a coordinate system based on the maintenance device type and the safety level of the controlled device, and constructing a priority table.

[0013] In a preferred embodiment, evaluating the safety level of the controlled device based on the virtual loop connection relationship and signal type between the maintenance device and the controlled device in the dynamic topology map specifically includes: setting the safety level of the controlled device according to the type and virtual loop connection relationship of the controlled device, where the safety level includes high, medium, and low, and the types of the controlled devices include protection devices and measurement and control devices.

[0014] In a preferred embodiment, detecting concurrent instruction conflicts through the priority table specifically includes: receiving concurrent maintenance control instructions in real time and obtaining the corresponding priority values based on the priority table; Judging and analyzing instruction conflicts based on the priority values: analyzing whether there are two or more instructions acting on the same virtual loop, comparing the priority values of the instructions, and if the priority values are different, determining that there is an instruction conflict; checking the controlled devices associated with the instructions, and if multiple instructions are associated with the same controlled device and the priority values are different, determining that there is an instruction conflict.

[0015] In a preferred embodiment, identifying N - order virtual loops based on the dynamic topology map specifically includes: initializing a maintenance queue based on the dynamic topology map and marking the set of visited devices; traversing the elements of the maintenance queue, starting from all virtual terminals of the element, performing a reverse breadth - first search, traversing virtual connections with a path length N≥2, and recording the status of the end - point devices of each path; if the device has not been visited and is in the running state, determining that the path is an inter - bay association path, and constructing an N - order associated device set and the corresponding virtual loop set.

[0016] In a preferred embodiment, the generation of the minimum isolation set outputs a virtual terminal isolation instruction sequence with timing constraints according to signal levels, specifically as follows: identify the first common connection node in each path in the virtual loop set, and calculate the cross-bay coefficient of the path; arrange all critical paths in ascending order based on the cross-bay coefficient, preferentially select the path with the smallest cross-bay coefficient as the main isolation path, and remove the virtual terminal at the head end of the main isolation path; if there are still residual connections after the main path is removed, iteratively select the sub-optimal path as the associated isolation point to generate the minimum isolation set; generate an instruction sequence according to the electrical coupling relationship of each node in the minimum isolation set.

[0017] In a preferred embodiment, the incremental update of the dynamic topology diagram is controlled according to the instruction sequence, specifically as follows: perform an incremental update trigger judgment based on the instruction sequence, and if an update is required, perform the following steps; perform hierarchical incremental updates according to the affected device set, traverse each device in the set, update the status, and modify the coloring marks of the corresponding nodes in the dynamic topology diagram; extract all virtual loop edges associated with each device in the set, and adjust the on-off state and communication quality indicators according to the instruction sequence; perform cross-layer connectivity verification on the updated dynamic topology diagram, and push the changed virtual terminal connection status to the affected operating devices.

[0018] The technical effects and advantages of an intelligent substation secondary equipment maintenance control method and system of the present invention: 1. By integrating the static virtual loop connection relationship of the SCD file with the real-time maintenance pressure plate and GOOSE link status, the present invention constructs a dynamic topology diagram with status annotations, and uses a hierarchical coloring mechanism to intuitively present the three-level mapping relationship affected by maintenance. The red isolation area accurately locates the maintenance equipment, the yellow warning area marks the directly associated operating equipment, and the green monitoring area covers the N-order loop equipment indirectly affected, forming the dual capabilities of "visualization of static connections" and "measurability of dynamic risks". The hierarchical mechanism can not only locate the affected equipment in milliseconds under abnormal conditions, but also shield abnormal signals in real time through the incremental update mechanism, reduce the misoperation risk, and significantly improve the safety boundary protection ability during the maintenance process.

[0019] 2. Through the mapping priority table of device types and safety levels established based on the dynamic topology diagram, combined with signal types and device importance, the present invention realizes the conflict detection and intelligent sorting of concurrent maintenance instructions. The minimum isolation set containing "main isolation points" and "associated isolation points" is generated through the minimum cut set algorithm in graph theory, avoiding excessive operations caused by "one-size-fits-all" full isolation. The path optimization strategy based on the cross-bay coefficient ensures that the isolation operation follows the principles of "hierarchy first" and "signal dependence", and cooperates with the time window constraint (adjacent instruction interval ≥ device status refresh period), which not only guarantees the maintenance efficiency, but also avoids safety hazards caused by chaotic operation timing, making the maintenance process standardized and intelligent. Brief Description of the Drawings

[0020] Figure 1 It is a schematic flowchart of a method for controlling the maintenance of secondary equipment in an intelligent substation according to the present invention.

[0021] Figure 2 It is a schematic structural diagram of a control system for the maintenance of secondary equipment in an intelligent substation according to the present invention. Detailed Embodiments

[0022] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0023] Embodiment 1 Figure 1 A method for controlling the maintenance of secondary equipment in an intelligent substation according to the present invention is given, including the following steps: S1. Obtain the first data of the substation to construct a static matrix and generate a dynamic topology diagram; The first data includes the equipment type of the substation equipment, the connection relationship of virtual circuits, the status of maintenance pressure plates, and the communication status of GOOSE links; The obtaining of the first data of the substation to construct a static matrix and generate a dynamic topology diagram is specifically as follows: Obtain the SCD file and extract the unique equipment identifier, type, and virtual circuit connection relationship, and construct a static matrix including signal types and transmission directions; Real-time collect the status of equipment maintenance pressure plates and the communication status of GOOSE links, and generate a dynamic data vector including the equipment operation status and communication status; Fuse the static matrix and the dynamic data vector, and construct a directed graph with state labels with equipment as nodes and virtual circuits as directed edges, where the node labels the equipment operation status, and the edge labels the signal type and real-time communication status, to form a dynamic topology diagram.

[0024] The dynamic topology diagram adopts a hierarchical coloring mechanism: The first layer marks the equipment with the maintenance pressure plate inserted as a red isolation area; The second layer marks the operating equipment with a direct virtual connection to the red area as a yellow warning area; The third layer marks the equipment with an N + 1 jump relationship with the yellow area as a green monitoring area.

[0025] The core value of constructing a dynamic topology diagram for the maintenance control of secondary equipment in an intelligent substation lies in realizing "visualization of static connections" and "measurability of dynamic risks", and the specific benefits are as follows: Accurately locate the scope of maintenance impact: The dynamic topology diagram can clearly present the three-level mapping relationship of "maintenance equipment → associated equipment → impact path" by parsing the virtual circuit connection matrix of the SCD file and superimposing the real-time maintenance pressure plate status and GOOSE communication status. For example, when a line protection device is under maintenance, it can not only identify the directly connected intelligent terminal (1st-order circuit), but also locate the indirectly associated busbar protection device through N-order circuit traversal (such as the 2nd-order circuit that shares SV data through the merging unit), avoiding the risk of "operation with maintenance" caused by missing the removal of key virtual circuits due to traditional static rules.

[0026] Improve maintenance efficiency: Based on graph theory modeling of dynamic topology (such as the minimum cut set algorithm), the system can automatically generate a minimum isolation set including "main isolation point" (direct tripping circuit) and "associated isolation point" (indirect impact circuit), avoiding excessive operations caused by "one-size-fits-all" full isolation. For example, when multiple devices are repaired in parallel, the isolation order is sorted through the priority mapping table (combined with the device type and signal safety level), so that the tripping signal circuit (high safety level) takes precedence over the measurement signal circuit (low safety level), reducing the number of operation steps and shortening the maintenance time.

[0027] Strengthen safety boundary protection: When the maintenance plate status changes or the GOOSE link is suddenly interrupted, the incremental update mechanism of the dynamic topology map can locate the affected running equipment in milliseconds (such as quickly retrieving associated equipment through a static matrix), and only push the changed virtual terminal connection status to the relevant equipment to avoid irrelevant equipment from receiving redundant information. For example, when the protection device under maintenance mistakenly sends a trip signal, the dynamic topology map can mark the link as "isolated" in real time, and trigger the running equipment to automatically shield the input of the circuit to prevent the protection from malfunctioning, which can shorten the abnormal signal processing delay and reduce the risk of malfunction.

[0028] S2, determine the security level of the controlled device according to the dynamic topology map, establish a priority table mapping device type and security level, and detect concurrent command conflicts; The security level of the controlled device is determined according to the dynamic topology diagram, and a priority table for mapping device type and security level is established, specifically: According to the configuration information of the equipment in the SCD file and the functional positioning of the equipment in the smart substation, the maintenance equipment is divided into different types; According to the virtual circuit connection relationship and signal type between the maintenance equipment and the controlled equipment in the dynamic topology diagram, the safety level of the controlled equipment is evaluated and determined; A coordinate system is established according to the type of maintenance equipment and the safety level of the controlled equipment, and a priority table is constructed.

[0029] The types of maintenance equipment include protection equipment, measurement and control equipment, and interface equipment; Among them, each cell in the priority table corresponds to a priority value, and the smaller the value, the higher the priority.

[0030] The safety level of the controlled equipment is evaluated according to the virtual loop connection relationship and signal type between the maintenance equipment and the controlled equipment in the dynamic topology diagram. Specifically: If the controlled equipment is protection equipment and there is a virtual loop connection with a trip signal between it and the maintenance equipment, the safety level of the controlled equipment is set to high; If the controlled equipment is measurement and control equipment and there is a virtual loop connection with an input signal between it and the maintenance equipment, the safety level is set to medium; The safety level of the controlled equipment that only has a virtual loop connection with measurement signals with the maintenance equipment, or is a standby equipment, is set to low.

[0031] The concurrent instruction conflicts are detected through the priority table. Specifically: Collect several concurrent maintenance control instructions in real time. For each instruction, determine the type of maintenance equipment and the safety level of the associated controlled equipment, and obtain the corresponding priority value based on the priority table; Analyze whether there are two or more instructions acting on the same virtual loop, compare the priority values of the instructions. If the priority values are different, it is determined that there is an instruction conflict; Check the controlled equipment associated with the instruction. If multiple instructions are associated with the same controlled equipment and the priority values are different, it is also determined that there is an instruction conflict; If the priority values of multiple instructions are the same, perform a secondary sorting based on the preset sorting rules for instructions of the same level.

[0032] The secondary sorting based on the preset sorting rules for instructions of the same level is specifically: Signal type priority: trip signal > malfunction signal > alarm signal; Importance of equipment: main protection equipment > backup protection equipment > measurement and control equipment; Timestamp order: The instruction received first is executed first.

[0033] S3. If there are concurrent instruction conflicts, perform an incremental update of the dynamic topology diagram. The incremental update steps include: Identify N - order virtual loops based on the dynamic topology diagram, generate a minimum isolation set, and output a virtual terminal isolation instruction sequence with time - sequence constraints according to the signal level; when the maintenance pressure plate or GOOSE link state changes, locate the affected equipment based on the static matrix, and control the incremental update of the dynamic topology diagram according to the instruction sequence.

[0034] The identification of N - order virtual loops based on the dynamic topology diagram is specifically: Initialize the maintenance queue based on the dynamic topology diagram and mark the set of accessed devices; Traverse the elements of the maintenance queue, starting from all virtual terminals of the element, perform reverse breadth-first search, traverse the virtual connections with a path length N≥2, and record the status of the end devices of each path; If the device has not been accessed and is in the running state, determine that the path is an inter-bay association path, and construct an N-order associated device set and the corresponding virtual loop set.

[0035] To generate the minimum isolation set and output a virtual terminal isolation instruction sequence with timing constraints according to the signal level, specifically: Identify the first common connection node in each path in the virtual loop set and calculate the inter-bay coefficient of the path; the first common connection node is the intersection point of multiple maintenance device paths and is directly connected to the running device downstream; Arrange all critical paths in ascending order based on the inter-bay coefficient, and preferentially select the path with the smallest inter-bay coefficient as the main isolation path, and cut off the virtual terminal at the head of the main isolation path; If there are still residual connections after the main path is cut off, iteratively select the sub-optimal path as the associated isolation point to generate the minimum isolation set; Generate an instruction sequence according to the electrical coupling relationship of each node in the minimum isolation set.

[0036] The electrical coupling relationship of each node in the minimum isolation set is specifically: Hierarchical priority: Perform isolation in descending order of voltage level; Signal dependence: For blocking chain signals (such as bus differential protection tripping commands), operate in reverse order according to the signal flow direction (isolate the end first and then cut off the source); Time window constraint: The interval between adjacent instructions Δt≥Tmin, where Tmin is the IED device status refresh period.

[0037] The inter-bay coefficient of the path is specifically:

[0038]

[0039] Among them, is the inter-bay coefficient of the path, and are the preset weight coefficients respectively, is the number of voltage levels crossed by the path, is the number of non-maintenance devices associated with the path, is the current voltage of the path.

[0040] First-order loop: A virtual loop directly sent or received by the equipment under maintenance (such as the tripping GOOSE from the protection device to the intelligent terminal); Nth-order loop: A loop indirectly connected through N - 1 intermediate devices (such as protection device → merging unit → another protection device, N = 2).

[0041] When the maintenance pressing plate or the GOOSE link state changes, the equipment affected is located based on the static matrix, specifically as follows: Real-time monitor the communication status of the maintenance pressing plate and the GOOSE link. When a status change is detected, if the equipment enters the maintenance state, then based on the static matrix, find all the in-service equipment with virtual loop connections as the directly affected equipment; If the link is interrupted, locate the source device (sender) and the sink device (receiver) of the link. If they are in the running state, they are determined as directly affected equipment; For the directly affected equipment, find its associated other in-service equipment (i.e., the equipment in the indirectly connected Nth-order loop) again through the static matrix until no new equipment is added, forming a complete set of affected equipment.

[0042] The state changes include: When it is detected that the state of the maintenance pressing plate changes from "withdrawn" to "inserted" (the equipment enters the maintenance mode) or from "inserted" to "withdrawn" (the maintenance ends), extract the unique identifier (DOI) and the new state of the changed equipment; When the GOOSE link state changes from "normal" to "interrupted" (such as a physical link failure) or from "interrupted" to "normal" (the fault is repaired), extract the DOI of the source device, the DOI of the sink device, and the on / off state of the link.

[0043] The incremental update of the dynamic topology diagram is controlled according to the instruction sequence, specifically as follows: Perform an incremental update trigger judgment based on the instruction sequence; Execute a hierarchical incremental update according to the set of affected equipment. Traverse each device in the set, update the state, and modify the coloring mark of the corresponding node in the dynamic topology diagram; Extract all the virtual loop sides associated with each device in the set, and adjust the on / off state and the communication quality index according to the instruction sequence; Perform a cross-layer connectivity verification on the updated dynamic topology diagram, and push the changed virtual terminal connection state to the affected in-service equipment.

[0044] The cross-layer connectivity verification is specifically as follows: Check whether there is an illegal connection between the equipment in the yellow warning area and the red isolation area, and at the same time verify that the number of hops from the equipment in the green monitoring area to the red area ≥ N + 1 (N is the preset isolation order).

[0045] The incremental update trigger judgment is specifically as follows: When the state change of the maintenance pressure plate exceeds the preset threshold time and the communication quality index of the associated virtual circuit exceeds the preset safety threshold, the topology update is triggered.

[0046] Furthermore, mark the nodes of the changed devices as the maintenance state (such as yellow marking) or the running state (such as green marking), without changing the node states of other devices, and mark "maintenance boundary" for all associated virtual circuit sides of the devices; If the link is interrupted, mark the communication state of the corresponding side as "interrupted", change the side style to a dotted line, and retain the signal type color (such as the trip signal is still red); If the link is restored, the side style is restored to a solid line, the communication state is marked as "normal", and the signal type and maintenance boundary mark are not changed.

[0047] Embodiment 2, an intelligent substation secondary equipment maintenance control system, includes the following modules: Topology graph generation module: used to construct a static matrix based on the first data of the substation and generate a dynamic topology graph; Instruction conflict detection module: used to determine the safety level of the controlled device according to the dynamic topology graph, establish a priority table mapping the device type and the safety level, and detect concurrent instruction conflicts; Incremental update module: used to perform incremental update on the dynamic topology graph if there are concurrent instruction conflicts. The incremental update steps include: Identify N - order virtual circuits based on the dynamic topology graph, generate a minimum isolation set, and output a virtual terminal isolation instruction sequence with time - sequence constraints according to the signal level; when the state of the maintenance pressure plate or the GOOSE link changes, locate the affected devices based on the static matrix, and control the incremental update of the dynamic topology graph according to the instruction sequence.

[0048] The above formulas are all dimensionless and take their numerical values for calculation. The formulas are obtained by collecting a large amount of data for software simulation to get a formula closest to the actual situation. The preset parameters in the formulas are set by those skilled in the art according to the actual situation.

[0049] The above embodiments can be implemented in whole or in part by software, hardware, firmware, or any other combination. When implemented using software, the above embodiments can be implemented in whole or in part in the form of a computer program product.

[0050] Those of ordinary skill in the art will realize that the modules and algorithm steps of each example described in combination with the embodiments disclosed herein can be implemented in electronic hardware, or in a combination of computer software and electronic hardware. Whether these functions are executed in hardware or software depends on the specific application and design constraints of the technical solution. Professional technicians can use different methods to implement the described functions for each specific application, but such implementation should not be considered to exceed the scope of this application.

[0051] In addition, the functional modules in each embodiment of this application can be integrated into one processing module, or each module can exist physically alone, or two or more modules can be integrated into one module.

[0052] As mentioned above, this is only the specific implementation manner of this application, but the protection scope of this application is not limited thereto. Any person skilled in the art within the technical scope disclosed in this application can easily think of changes or substitutions, which should all be covered by the protection scope of this application. Therefore, the protection scope of this application should be subject to the protection scope of the claims.

[0053] Finally: The above are only the preferred embodiments of the present invention and are not used to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims

1. A maintenance control method for secondary equipment of a smart substation, characterized in that: The following steps are involved: Building a static matrix based on the first data of the substation and generating a dynamic topology diagram; Determine the security level of the controlled equipment based on the dynamic topology diagram, establish a priority table mapping equipment type and security level, and detect concurrent command conflicts; If there is a concurrent instruction conflict, the dynamic topology map is incrementally updated. The incremental update steps include: Based on the dynamic topology graph, N-order virtual circuits are identified, the minimum isolation set is generated, and the virtual terminal isolation instruction sequence with timing constraints is output according to the signal level; When the maintenance plate or GOOSE link status changes, the affected devices are located based on the static matrix, and the incremental update of the dynamic topology map is controlled according to the instruction sequence.

2. The intelligent substation secondary equipment maintenance control method according to claim 1 is characterized in that: The static matrix is ​​constructed based on the first data of the substation, and a dynamic topology diagram is generated, specifically: Obtaining first data of the substation and constructing a static matrix and a dynamic data vector respectively; The static matrix is ​​integrated with the dynamic data vector to construct a state-annotated directed graph with devices as nodes and virtual circuits as directed edges, forming a dynamic topology graph.

3. The intelligent substation secondary equipment maintenance control method according to claim 2 is characterized in that: The security level of the controlled device is determined according to the dynamic topology diagram, and a priority table for mapping device type and security level is established, specifically: Classify maintenance equipment into different types according to SCD documents; According to the virtual circuit connection relationship and signal type between the maintenance equipment and the controlled equipment in the dynamic topology diagram, the safety level of the controlled equipment is evaluated and determined; A coordinate system is established according to the type of maintenance equipment and the safety level of the controlled equipment, and a priority table is constructed.

4. The intelligent substation secondary equipment maintenance control method according to claim 3 is characterized in that: The security level of the controlled device is evaluated according to the virtual circuit connection relationship and signal type between the maintenance device and the controlled device in the dynamic topology diagram, specifically: The security level of the controlled device is set according to the type of the controlled device and the virtual circuit connection relationship. The security level includes high, medium and low. The type of the controlled device includes protection equipment and measurement and control equipment.

5. The intelligent substation secondary equipment maintenance control method according to claim 4 is characterized in that: The detection of concurrent instruction conflicts is specifically as follows: Receive concurrent maintenance control instructions in real time and obtain corresponding priority values ​​based on the priority table; Judge and analyze instruction conflicts based on priority values: analyze whether there are two or more instructions acting on the same virtual circuit, compare the priority values ​​of the instructions, if the priority values ​​are different, it is determined to be an instruction conflict; check the controlled devices associated with the instructions, if multiple instructions are associated with the same controlled device and have different priority values, it is determined to be an instruction conflict.

6. The intelligent substation secondary equipment maintenance control method according to claim 5 is characterized in that: The identification of N-order virtual loops based on the dynamic topology graph is specifically as follows: Initialize the maintenance queue based on the dynamic topology map and mark the accessed device set; Traverse the maintenance queue elements, start from all virtual terminals of the elements, perform reverse breadth-first search, traverse the virtual connections with path length N ≥ 2, and record the status of the end device of each path; If the device has not been accessed and is in operation, the path is determined to be a cross-interval association path, and an N-order association device set and a corresponding virtual circuit set are constructed.

7. The intelligent substation secondary equipment maintenance control method according to claim 6 is characterized in that: The generating of the minimum isolation set and outputting of the virtual terminal isolation instruction sequence with timing constraints according to the signal level are specifically as follows: Identify the first common connection node in each path in the set of virtual circuits and calculate the spanning coefficient of the path; Arrange all critical paths in ascending order based on the span coefficient, select the path with the smallest span coefficient as the main isolation path, and cut off the virtual terminal at the first end of the main isolation path; If there are still residual connections after the main path is removed, the suboptimal path is iteratively selected as the associated isolation point to generate the minimum isolation set; An instruction sequence is generated according to the electrical coupling relationship of each node in the minimum isolation set.

8. The intelligent substation secondary equipment maintenance control method according to claim 7 is characterized in that: The incremental update of the dynamic topology graph is controlled according to the instruction sequence, specifically: Incremental update trigger judgment is performed based on the instruction sequence. If update is required, the following steps are performed; Perform hierarchical incremental updates based on the affected device set, traverse each device in the set, update the status, and modify the color mark of the corresponding node in the dynamic topology map; Extract all virtual circuit edges associated with each device in the set, and adjust the on / off status and communication quality indicators according to the instruction sequence; Perform cross-layer connectivity verification on the updated dynamic topology map and push the changed virtual terminal connection status to the affected running devices.

9. A system using a smart substation secondary equipment maintenance control method as claimed in any one of claims 1 to 8, characterized in that: Includes the following modules: Topology map generation module: used to construct a static matrix based on the first data of the substation and generate a dynamic topology map; Instruction conflict detection module: used to determine the security level of the controlled device based on the dynamic topology map, establish a priority table mapping device type and security level, and detect concurrent instruction conflicts; Incremental update module: used to incrementally update the dynamic topology map if there is a concurrent instruction conflict. The incremental update steps include: Based on the dynamic topology graph, N-order virtual circuits are identified, the minimum isolation set is generated, and the virtual terminal isolation instruction sequence with timing constraints is output according to the signal level; When the maintenance plate or GOOSE link status changes, the affected devices are located based on the static matrix, and the incremental update of the dynamic topology map is controlled according to the instruction sequence.

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