A secondary equipment maintenance control method and system for an intelligent substation

Abstract

The present invention discloses a method and system for overhaul control of secondary equipment in an intelligent substation, relating to the technical field of secondary equipment overhaul control, and comprising the following steps: acquiring first data of the substation to construct a static matrix and generating a dynamic topology diagram; determining the safety level of the controlled equipment according to the dynamic topology diagram and establishing a priority table for mapping between equipment types and safety levels; detecting concurrent instruction conflicts through the priority table, identifying N-order virtual loops 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 overhaul pressing plate or the state of the GOOSE link changes, locating the affected equipment based on the static matrix and controlling the incremental update of the dynamic topology diagram according to the instruction sequence. Based on the path optimization strategy of the cross-bay coefficient and in cooperation with the time window constraint, the present invention not only ensures the overhaul efficiency but also avoids potential safety hazards caused by chaotic operation timing sequences, making the overhaul process 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 an intelligent substation, data transmission is achieved 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 "virtual", 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 timely detect potential hazards such as incorrect input or withdrawal of soft pressure plates, which may lead to protection tripping accidents and expand the scope of accident influence.

[0004] In addition, under the maintenance conditions of primary and secondary equipment, various soft pressure plates need to be accurately operated, such as withdrawing the SV receiving soft pressure plate and GOOS sending and receiving soft pressure plates of the equipment under maintenance in the operating equipment. However, the implementation of maintenance operation safety measures requires a high professional quality 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 malfunction 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 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 the hardware board of secondary equipment in a smart 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 the hardware board 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 "isolate 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 a smart 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:

[0011] A maintenance control method for secondary equipment in a smart 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 concurrent instruction conflicts; if there are concurrent instruction conflicts, then perform incremental update of the dynamic topology diagram. The incremental update step includes: 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 time sequence constraints according to the signal level; when the maintenance pressing plate or the GOOSE link state 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.

[0012] 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 circuits as directed edges, thereby forming a dynamic topology map.

[0013] 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 between device types and safety levels specifically includes: classifying the maintenance devices into different types according to the SCD file; evaluating the safety level of the controlled device according to the virtual circuit 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 to construct a priority table.

[0014] In a preferred embodiment, evaluating the safety level of the controlled device according to the virtual circuit 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 of the controlled device and the virtual circuit connection relationship, where the safety level includes high, medium, and low, and the types of the controlled devices include protection devices and measurement and control devices.

[0015] 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;

[0016] Judging and analyzing instruction conflicts based on the priority values: analyzing whether there are two or more instructions acting on the same virtual circuit, 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.

[0017] In a preferred embodiment, identifying N - order virtual circuits 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 elements, performing 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 an operating state, determining that the path is an inter - bay association path, and constructing an N - order associated device set and the corresponding virtual circuit set.

[0018] In a preferred embodiment, the generation of the minimum isolation set outputs a virtual terminal isolation instruction sequence with timing constraints according to the signal level, specifically: identifying the first common connection node in each path of the virtual loop set and calculating the cross-section coefficient of the path; arranging all critical paths in ascending order based on the cross-section coefficient, preferentially selecting the path with the smallest cross-section coefficient as the main isolation path, and removing 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 selecting the sub-optimal path as the associated isolation point to generate the minimum isolation set; generating an instruction sequence according to the electrical coupling relationship of each node in the minimum isolation set.

[0019] In a preferred embodiment, the incremental update of the dynamic topology diagram is controlled according to the instruction sequence, specifically: making an incremental update trigger judgment based on the instruction sequence, and if an update is required, performing the following steps; performing hierarchical incremental update according to the affected device set, traversing each device in the set, updating the status, and modifying the coloring mark of the corresponding node in the dynamic topology diagram; extracting all virtual loop edges associated with each device in the set, and adjusting the on-off state and communication quality index according to the instruction sequence; performing cross-layer connectivity verification on the updated dynamic topology diagram, and pushing the changed virtual terminal connection state to the affected operating devices.

[0020] The technical effects and advantages of the intelligent substation secondary equipment maintenance control method and system of the present invention:

[0021] 1. By integrating the static virtual loop connection relationship of the SCD file with the real-time maintenance pressing plate and the GOOSE link state, the present invention constructs a dynamic topology diagram with status annotations, and adopts 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 "static connection visualization" and "dynamic risk measurability". The hierarchical mechanism can not only locate the affected equipment in the abnormal state in milliseconds, 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.

[0022] 2. The present invention realizes the conflict detection and intelligent sorting of concurrent maintenance instructions by means of a mapping priority table of device types and safety levels established based on a dynamic topology graph, in combination with signal types and device importance. The minimum cut set algorithm in graph theory is used to generate a minimum isolation set including "main isolation points" and "associated isolation points", avoiding excessive operations caused by "one-size-fits-all" full isolation. Based on the path optimization strategy of the cross-interval coefficient, it is ensured that the isolation operation follows the principles of "hierarchy first" and "signal dependence", and with the time window constraint (adjacent instructions interval ≥ device status refresh period), it not only guarantees the maintenance efficiency but also avoids potential safety hazards caused by chaotic operation timing, making the maintenance process standardized and intelligent. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic flow chart of a method for maintaining and controlling secondary equipment in an intelligent substation according to the present invention.

[0024] Figure 2 It is a schematic structural diagram of a control system for maintaining secondary equipment in an intelligent substation according to the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0025] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to 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 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.

[0026] Embodiment 1 Figure 1 A method for maintaining and controlling secondary equipment in an intelligent substation according to the present invention is given, including the following steps:

[0027] S1. Obtain the first data of the substation to construct a static matrix and generate a dynamic topology graph;

[0028] The first data includes the device types of substation equipment, the connection relationship of virtual circuits, the status of maintenance pressure plates, and the communication status of GOOSE links;

[0029] The obtaining of the first data of the substation to construct a static matrix and generate a dynamic topology graph is specifically as follows:

[0030] Obtain the SCD file and extract the device unique identifier, type, and virtual circuit connection relationship to construct a static matrix including signal types and transmission directions;

[0031] Real-time collect the status of device maintenance pressure plates and the communication status of GOOSE links to generate a dynamic data vector including the device operation status and communication status;

[0032] Fuse the static matrix with the dynamic data vector to construct a directed graph with state annotations, where the devices are nodes and the virtual circuits are directed edges. The node annotations represent the operating states of the devices, and the edge annotations represent the signal types and real-time communication states, forming a dynamic topology graph.

[0033] The dynamic topology graph adopts a hierarchical coloring mechanism:

[0034] The first layer marks the devices with maintenance pressure plates inserted as a red isolation area;

[0035] The second layer marks the operating devices with direct virtual connections to the red area as a yellow warning area;

[0036] The third layer marks the devices with an N+1 jump relationship to the yellow area as a green monitoring area.

[0037] The core value of constructing a dynamic topology graph for the secondary equipment maintenance control of an intelligent substation lies in realizing "visualization of static connections" and "measurability of dynamic risks". The specific benefits are as follows:

[0038] Accurately locate the scope of maintenance impact: By analyzing the virtual circuit connection matrix of the SCD file and superimposing the real-time maintenance pressure plate state and GOOSE communication state, the dynamic topology graph can clearly present the three-level mapping relationship of "maintenance equipment → associated equipment → impact path". For example, when a certain line protection device is under maintenance, not only can the directly connected intelligent terminal (1st-order circuit) be identified, but also the indirectly associated bus protection device can be located through traversing the Nth-order circuit (such as the 2nd-order circuit sharing SV data through the merging unit), avoiding the risk of "operating with maintenance" caused by missing key virtual circuits in traditional static rules.

[0039] Improve the maintenance efficiency: Based on the graph theory modeling of the dynamic topology graph (such as the minimum cut set algorithm), the system can automatically generate the minimum isolation set containing the "main isolation point" (direct tripping circuit) and the "associated isolation point" (indirect impact circuit), avoiding the excessive operation caused by "one-size-fits-all" full isolation. For example, when multiple devices are under parallel maintenance, the isolation order is sorted through the priority mapping table (combining device type and signal safety level), so that the tripping signal circuit (high safety level) is executed prior to the measurement signal circuit (low safety level), reducing the operation steps and shortening the maintenance time.

[0040] Strengthen security boundary protection: When the maintenance pressure plate status changes or the GOOSE link suddenly interrupts, the incremental update mechanism of the dynamic topology diagram can locate the affected operating equipment at the millisecond level (such as quickly retrieving associated equipment through a static matrix), and only push the changed virtual terminal connection status to relevant equipment, avoiding redundant information being received by unrelated equipment. For example, when a protection device under maintenance sends a false trip signal, the dynamic topology diagram can mark this link as "isolated" in real time and trigger the operating equipment to automatically shield the input of this circuit, preventing misoperation of the protection, shortening the processing delay of abnormal signals, and reducing the risk of misoperation.

[0041] S2. Determine the security level of the controlled equipment according to the dynamic topology diagram, establish a priority table mapping equipment types to security levels, and detect concurrent instruction conflicts;

[0042] The specific method for determining the security level of the controlled equipment according to the dynamic topology diagram and establishing a priority table mapping equipment types to security levels is as follows:

[0043] Classify the maintenance equipment into different types according to the configuration information of the equipment in the SCD file and the functional location of the equipment in the intelligent substation;

[0044] Evaluate the security level of the controlled equipment according to the virtual loop connection relationship and signal type between the maintenance equipment and the controlled equipment in the dynamic topology diagram, and determine the security level of the controlled equipment;

[0045] Establish a coordinate system based on the maintenance equipment type and the security level of the controlled equipment, and construct a priority table.

[0046] The types of maintenance equipment include protection equipment, measurement and control equipment, and interface equipment;

[0047] Among them, each cell in the priority table corresponds to a priority value, and the smaller the value, the higher the priority.

[0048] The specific method for evaluating the security level of the controlled equipment according to the virtual loop connection relationship and signal type between the maintenance equipment and the controlled equipment in the dynamic topology diagram is as follows:

[0049] 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 security level of the controlled equipment is set to high;

[0050] 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 security level is set to medium;

[0051] Set the security level of the controlled equipment that only has a virtual loop connection with measurement signals to the maintenance equipment or is a standby equipment to low.

[0052] The detection of concurrent instruction conflicts through the priority table is specifically as follows:

[0053] Collect several concurrent maintenance control instructions in real time. For each instruction, determine the type of maintenance equipment, the safety level of the associated controlled equipment, and obtain the corresponding priority value based on the priority table;

[0054] 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;

[0055] 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;

[0056] 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.

[0057] The secondary sorting based on the preset sorting rules for instructions of the same level is specifically as follows:

[0058] Priority of signal types: Trip signal > Malfunction signal > Alarm signal;

[0059] Importance of equipment: Main protection equipment > Backup protection equipment > Measurement and control equipment;

[0060] Timestamp order: The instruction received first is executed first.

[0061] S3, if there are concurrent instruction conflicts, then perform incremental updates to the dynamic topology diagram. The incremental update steps include:

[0062] 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.

[0063] The identification of N - order virtual loops based on the dynamic topology diagram is specifically as follows:

[0064] Initialize the maintenance queue based on the dynamic topology diagram and mark the set of visited equipment;

[0065] Traverse the elements of the maintenance queue. Starting from all virtual terminals of the element, perform a reverse breadth - first search, traverse virtual connections with a path length N≥2, and record the status of the end - point equipment of each path;

[0066] If the equipment has not been visited and is in the running state, determine that the path is an inter - interval association path, and construct an N - order associated equipment set and the corresponding virtual loop set.

[0067] The generation of the minimum isolation set outputs a virtual terminal isolation instruction sequence with timing constraints according to the signal level, specifically as follows:

[0068] Identify the first common connection node in each path of the virtual loop set and calculate the cross-bay coefficient of the path; the first common connection node is the intersection point of multiple maintenance equipment paths and is directly connected to the operating equipment downstream;

[0069] Arrange all critical paths in ascending order based on the cross-bay coefficient, and preferentially select the path with the smallest cross-bay coefficient as the main isolation path, and cut off the virtual terminal at the head end of the main isolation path;

[0070] 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;

[0071] Generate an instruction sequence according to the electrical coupling relationship of each node in the minimum isolation set.

[0072] The electrical coupling relationship of each node in the minimum isolation set is specifically as follows:

[0073] Hierarchical priority: Perform isolation in descending order of voltage level;

[0074] Signal dependence: For blocking chain signals (such as the bus differential protection tripping command), operate in reverse order according to the signal flow direction (isolate the end first and then cut off the source);

[0075] Time window constraint: The interval Δt between adjacent instructions is ≥ Tmin, where Tmin is the IED device status refresh period.

[0076] The cross-bay coefficient of the path is specifically as follows:

[0077]

[0078]

[0079] Among them, is the cross-bay coefficient of the path, and are respectively preset weight coefficients, is the number of voltage levels crossed by the path, is the number of non-maintenance equipment associated with the path, is the current voltage of the path.

[0080] 1st-order loop: The virtual loop directly sent or received by the maintenance equipment (such as the trip GOOSE from the protection device to the intelligent terminal);

[0081] Nth-order loop: The loop indirectly connected through N-1 intermediate devices (such as protection device → merging unit → another protection device, N = 2).

[0082] When the maintenance pressing plate or the GOOSE link status changes, locate the affected devices based on the static matrix. Specifically:

[0083] Real-time monitor the communication status of the maintenance pressing plate and the GOOSE link. When a status change is detected, if the device enters the maintenance state, search for all in-service devices with virtual loop connections based on the static matrix as directly affected devices;

[0084] If the link is interrupted, locate the source device (sender) and sink device (receiver) of the link. If they are in the running state, they are determined as directly affected devices;

[0085] For directly affected devices, search for other in-service devices associated with them (i.e., N-order loop devices connected indirectly) through the static matrix again until no new devices are added, forming a complete set of affected devices.

[0086] The status changes include:

[0087] When it is detected that the status of the maintenance pressing plate changes from "withdrawn" to "inserted" (the device enters the maintenance mode) or from "inserted" to "withdrawn" (the maintenance ends), extract the unique identifier (DOI) and the new status of the changed device;

[0088] When the GOOSE link status 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 status of the link.

[0089] The specific method of controlling the incremental update of the dynamic topology diagram according to the instruction sequence is as follows:

[0090] Perform an incremental update trigger judgment based on the instruction sequence;

[0091] Perform a hierarchical incremental update according to the set of affected devices. Traverse each device in the set, update the status, and modify the coloring mark of the corresponding node in the dynamic topology diagram;

[0092] 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;

[0093] Perform a cross-layer connectivity verification on the updated dynamic topology diagram, and push the changed virtual terminal connection status to the affected in-service devices.

[0094] The specific method of the cross-layer connectivity verification is as follows:

[0095] Check whether there is an illegal connection between the devices in the yellow warning area and the red isolation area, and at the same time verify that the hop count from the devices in the green monitoring area to the red area is ≥ N + 1 (N is the preset isolation order).

[0096] Perform the incremental update trigger judgment, specifically:

[0097] When the state change of the maintenance pressing plate exceeds the preset threshold time and the communication quality index of the associated virtual circuit exceeds the preset safety threshold, trigger the topology update.

[0098] Furthermore, mark the nodes of the changed devices as the maintenance state (such as yellow marking) or the operating state (green marking), without changing the node states of other devices, and mark "maintenance boundary" for all associated virtual circuit sides of the devices;

[0099] 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);

[0100] 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.

[0101] Embodiment 2, an intelligent substation secondary equipment maintenance control system, includes the following modules:

[0102] Topology diagram generation module: used to construct a static matrix based on the first data of the substation and generate a dynamic topology diagram;

[0103] Instruction conflict detection module: used to determine the safety level of the controlled device according to the dynamic topology diagram, establish a priority table for mapping the device type and the safety level, and detect concurrent instruction conflicts;

[0104] Incremental update module: used to perform incremental update on the dynamic topology diagram if there are concurrent instruction conflicts. The incremental update steps include:

[0105] Identify N - order virtual circuits 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 state of the maintenance pressing 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.

[0106] 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.

[0107] The above embodiments can be implemented in whole or in part by software, hardware, firmware, or any combination thereof. When implemented using software, the above embodiments can be implemented in whole or in part in the form of a computer program product.

[0108] Those of ordinary skill in the art will realize that the modules and algorithm steps of the examples described in conjunction 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. A professional technician can use different methods for each specific application to implement the described functions, but such implementation should not be considered to exceed the scope of this application.

[0109] In addition, in each embodiment of this application, the functional modules 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.

[0110] As mentioned above, the above 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 within the protection scope of this application. Therefore, the protection scope of this application should be subject to the protection scope of the claims.

[0111] Finally: The above is only the preferred embodiment of the present invention and is not used to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A maintenance control method for secondary equipment in an intelligent substation, characterized in that It includes the following steps: Construct a static matrix based on the first substation data and generate a dynamic topology diagram. The first data includes the device type of substation equipment, the connection relationship of virtual circuits, the status of maintenance pressure plates, and the communication status of GOOSE links; Determine the safety level of the controlled device according to the dynamic topology diagram, establish a priority table mapping device types to safety levels, and determine whether there are instruction conflicts by comparing the priority values of multiple instructions acting on the same virtual circuit or the same controlled device; If there are concurrent instruction conflicts, then perform incremental updates on the dynamic topology diagram. The incremental update steps include: Identify N-order virtual circuits based on the dynamic topology diagram, generate a minimum isolation set, and output a virtual terminal isolation instruction sequence with timing constraints according to the signal level; when the status of the maintenance pressure plate or 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. The generation of the minimum isolation set and the output 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 virtual circuit set and calculate the cross-bay coefficient of the path; Arrange all critical paths in ascending order of the cross-bay coefficient, preferentially select the path with the smallest cross-bay coefficient as the main isolation path, and cut off the virtual terminal at the head end 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 a minimum isolation set; Generate an instruction sequence according to the electrical coupling relationship of each node in the minimum isolation set.

2. The intelligent substation secondary equipment maintenance control method according to claim 1, characterized in that, The construction of the static matrix based on the first substation data and the generation of the dynamic topology diagram are specifically as follows: Obtain the first substation data and construct a static matrix and a dynamic data vector respectively; Fuse the static matrix and the dynamic data vector to construct a directed graph with state annotations, where the devices are nodes and the virtual circuits are directed edges, to form a dynamic topology diagram.

3. The intelligent substation secondary equipment maintenance control method according to claim 2, wherein, The determination of the safety level of the controlled device according to the dynamic topology diagram and the establishment of a priority table mapping device types to safety levels are specifically as follows: Classify the maintenance devices into different types according to the SCD file; Evaluate the safety level of the controlled device according to the virtual circuit connection relationship and signal type between the maintenance device and the controlled device in the dynamic topology diagram, and determine the safety level of the controlled device; Establish a coordinate system according to the maintenance device type and the safety level of the controlled device, and construct a priority table.

4. The intelligent substation secondary equipment maintenance control method according to claim 3, characterized in that, The evaluation of the safety level of the controlled device according to the virtual circuit connection relationship and signal type between the maintenance device and the controlled device in the dynamic topology diagram is specifically as follows: Set the safety level of the controlled device according to the type and virtual circuit connection relationship of the controlled device. The safety level includes high, medium, and low, and the types of the controlled devices include protection devices and measurement and control devices.

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

6. The intelligent substation secondary equipment maintenance control method according to claim 5, wherein The identification of N - order virtual loops based on the dynamic topology diagram is specifically as follows: Initialize the maintenance queue based on the dynamic topology diagram and mark the set of visited devices; Traverse the elements of the maintenance queue, starting from all virtual terminals of the element, perform reverse breadth - first search, traverse virtual connections with a path length N≥2, and record the status of the end - point devices of each path; If the device has not been visited and is in the running state, determine that the path is an inter - interval association path, and construct an N - order associated device set and the corresponding virtual loop set.

7. The intelligent substation secondary equipment maintenance control method according to claim 6, characterized in that The control of incremental update of the dynamic topology diagram according to the instruction sequence is specifically as follows: Perform an incremental update trigger judgment based on the instruction sequence. If an update is required, perform the following steps; Perform hierarchical incremental update according to the set of affected devices, traverse each device in the set, update the status, and modify the coloring mark of the corresponding node 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 running devices.

8. A system using an intelligent substation secondary equipment maintenance control method as described in any one of claims 1-7, characterized in that, It includes the following modules: Topology diagram generation module: Used to construct a static matrix based on the first - hand data of the substation and generate a dynamic topology diagram; Instruction conflict detection module: Used to determine the safety level of controlled devices according to the dynamic topology diagram, establish a priority table mapping device types and safety levels, and detect concurrent instruction conflicts; Incremental update module: Used to perform incremental update of the dynamic topology diagram if there are concurrent instruction conflicts. 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 status of the maintenance pressure plate or 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.

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