Station room light difference protection collaborative configuration method and system suitable for power distribution network area, computing equipment and medium

Abstract

The invention discloses a station room light difference protection cooperative configuration method and system suitable for a power distribution network area, a computing device and a medium, and relates to the technical field of power distribution network protection, and the method comprises the steps: obtaining the switching state information and operation state data of the power distribution network area; identifying a topological connection relationship of the power distribution network according to the data information, and constructing a first topological model according to the topological connection relationship; dividing the power distribution network into a plurality of dynamic virtual protection partitions based on the first topology model; based on a cooperative game model, calculating performance parameters of a light difference protection device in the target dynamic virtual protection partition to obtain a first protection constant value of the target dynamic virtual protection partition; and configuring the first protection setting value into the optical difference protection device in the target dynamic virtual protection partition. According to the method, the protection range and the protection constant value can be adjusted along with the change of the power grid structure in real time, and adaptive synchronization of light difference protection and dynamic change of the power grid is realized.

Description

Technical Field

[0001] This application relates to the field of power distribution network protection technology, and in particular to a method, system, computing device and medium for coordinated configuration of station optical differential protection in power distribution network areas. Background Technology

[0002] In the field of distribution network protection, optical differential protection has become the primary protection for important components such as substations and lines due to its simple principle, good selectivity, and rapid action. In existing technologies, the configuration of optical differential protection is typically based on offline calculations under a specific normal operating mode of the power grid (i.e., a fixed network topology and power output). Protection engineers, based on short-circuit current analysis under this mode, set a set of protection settings for each preset, fixed protection interval (such as a line between two substations). These protection settings are fixed in the protection device and remain essentially unchanged throughout the entire power grid operating cycle. This static configuration system relies on the premise of a relatively stable power grid structure and a single power flow direction, and its protection logic and settings have achieved certain application results in traditional distribution networks.

[0003] However, with the rapid development of active distribution networks with a high proportion of distributed generation, the aforementioned existing technologies have revealed new shortcomings. The operation of distribution networks has become frequent and dynamic due to load transfer, fault recovery and reconfiguration, and the random and intermittent switching of distributed generation. This leads to a disconnect between the pre-set optical differential protection domain and the actual electrical connection relationship. Fixed protection settings cannot adapt to changes in short-circuit current levels, easily causing protection devices to fail to operate or malfunction, and even leading to cascading trips, expanding the fault range. Therefore, existing static configuration methods can no longer meet the protection reliability requirements of modern active distribution networks, and a new method capable of dynamic and coordinated configuration is urgently needed. Summary of the Invention

[0004] This application provides a method, system, computing device, and medium for the coordinated configuration of optical differential protection in substations in distribution network areas. Through dynamic virtual partitioning and real-time topology identification, the protection range and protection settings can be dynamically adjusted in real time to follow changes in the power grid structure, thereby achieving adaptive synchronization between optical differential protection and dynamic changes in the power grid.

[0005] To achieve the above objectives, this application adopts the following technical solution: Firstly, this application provides a method for coordinated configuration of station optical differential protection in a distribution network area, the method comprising: Acquire switch status information and operational status data for the power distribution network area; The topological connections of the distribution network are identified based on switch status information and operating status data, and a first topological model is constructed based on the topological connections of the distribution network. Based on the first topology model, the distribution network is divided into multiple dynamic virtual protection zones; Based on a cooperative game model, the performance parameters of the optical differential protection device in the target dynamic virtual protection zone among multiple dynamic virtual protection zones are calculated to obtain the first protection setting value of the target dynamic virtual protection zone. Configure the first protection setting into the optical differential protection device within the target dynamic virtual protection partition.

[0006] In some possible implementations, the division of the distribution network into multiple dynamic virtual protection zones based on the first topology model includes: Based on the first topology model and graph theory search algorithm, anti-islanding operation and protection selectivity are taken as constraints. Stations and lines that meet the constraints and are electrically connected are aggregated to obtain multiple dynamic virtual protection zones.

[0007] In some possible implementations, the calculation of the performance parameters of the optical differential protection device within the target dynamic virtual protection zone in multiple dynamic virtual protection zones, based on a cooperative game model, to obtain the first protection setting of the target dynamic virtual protection zone, includes: Each optical differential protection device within the target dynamic virtual protection partition is defined as a game participant; The optional protection set combinations for each game participant are defined as the strategy set; Based on the real-time operating status of the target dynamic virtual protection partition, a total payoff function is constructed to evaluate the overall protection effectiveness of the partition. The input of the total payoff function is all game participants and the first strategy combination selected from the strategy set. By solving the cooperative game model, a first strategy combination that enables the total payoff function to reach a first evaluation threshold is obtained, and the first strategy combination is determined as the first protection setpoint.

[0008] In some possible implementations, the method further includes: After the target dynamic virtual protection partition is put into operation, the operating performance indicators of the target dynamic virtual protection partition are monitored in real time. When the operational performance indicators are detected to exceed the expected range, the weight parameters in the cooperative game model are adjusted, and the first protection setpoint is recalculated. The recalculated first protection setting is configured into the optical differential protection device within the target dynamic virtual protection partition.

[0009] In some possible implementations, configuring the first protection setting into the optical differential protection device within the target dynamic virtual protection partition includes: A setting configuration instruction is generated, and the first protection setting is sent to all target optical differential protection devices within the target dynamic virtual protection partition via a communication network in a transactional synchronization manner; wherein, the transactional synchronization ensures that the setting changes of all target devices are either all successful or all rolled back.

[0010] In some possible implementations, the method further includes: Establish a fixed-value version management file for each dynamic virtual protection partition; Record the protection settings, configuration time, corresponding power grid topology status, and verification results for each issuance; When the power grid topology is detected to have reverted to a historical state, the corresponding historical protection settings are retrieved from the setting version management file and the configuration is restored to the corresponding dynamic virtual protection partition.

[0011] In some possible implementations, the method further includes: A first communication topology is established for the target dynamic virtual protection partition, and the first communication topology is generated based on the electrical connection relationships in the first topology model; Based on the first communication topology, a first communication path is used to send the first protection setting to the optical differential protection device within the target dynamic virtual protection partition.

[0012] Secondly, this application provides a cooperative configuration system for station optical differential protection in a distribution network area, the system comprising: The acquisition module is used to acquire switch status information and operating status data of the distribution network area; The partitioning module is used to identify the topological connection relationship of the distribution network based on switch status information and operating status data, construct a first topological model based on the topological connection relationship of the distribution network, and divide the distribution network into multiple dynamic virtual protection zones based on the first topological model; The calculation module is used to calculate the performance parameters of the optical differential protection device in the target dynamic virtual protection zone among multiple dynamic virtual protection zones based on a cooperative game model, and to obtain the first protection setting value of the target dynamic virtual protection zone. The configuration module is used to configure the first protection setting value to the optical differential protection device within the target dynamic virtual protection partition.

[0013] Thirdly, this application provides a computing device, including a memory and a processor; The memory stores one or more computer programs, the one or more computer programs including instructions; when the instructions are executed by the processor, the computing device performs the method as described in any one of the first aspects.

[0014] Fourthly, this application provides a computer-readable storage medium for storing a computer program for performing the method as described in any one of the first aspects.

[0015] Fifthly, this application provides a computer program product comprising one or more computer instructions, wherein when the computer instructions are executed by a computer, the computer performs the method as described in any one of the first aspects.

[0016] As can be seen from the above technical solution, this application has at least the following beneficial effects: In this application, the processing device acquires switch status information and operating status data of the distribution network area; identifies the topological connection relationship of the distribution network based on the switch status information and operating status data, and constructs a first topology model according to the topological connection relationship of the distribution network; divides the distribution network into multiple dynamic virtual protection zones based on the first topology model; calculates the performance parameters of the optical differential protection device in the target dynamic virtual protection zone based on a cooperative game model, and obtains the first protection setting value of the target dynamic virtual protection zone; configures the first protection setting value into the optical differential protection device in the target dynamic virtual protection zone, so that the target dynamic virtual protection zone is put into operation according to the first protection setting value. In the prior art, the distribution network protection zones are mostly statically divided, and the setting value setting relies on manual experience. This has problems such as poor adaptability between the zone and the actual power grid topology, lack of global optimization of setting value coordination, and insufficient coordination between devices, which can easily lead to protection maloperation, failure to operate, or excessively long operation delay, affecting the power supply reliability and fault handling efficiency of the distribution network.

[0017] As can be seen, this application dynamically adapts to the power grid topology, ensuring that the protection zones are consistent with the actual electrical connections and avoiding the problem of zone misalignment; it achieves global collaborative optimization of settings through cooperative game theory, improving the reliability, selectivity and speed of protection, and reducing false trips and failures to trip; it automates the entire process, reducing reliance on manual labor and operation and maintenance costs, and improving the level of intelligent operation and maintenance; it quickly and accurately isolates faults, shortens power outage time, and ensures the reliability of power supply and the efficiency of fault handling in the distribution network.

[0018] It should be understood that the descriptions of technical features, technical solutions, beneficial effects, or similar language in this application do not imply that all features and advantages can be achieved in any single embodiment. Rather, it is understood that the description of a feature or beneficial effect means that a specific technical feature, technical solution, or beneficial effect is included in at least one embodiment. Therefore, the descriptions of technical features, technical solutions, or beneficial effects in this specification do not necessarily refer to the same embodiment. Furthermore, the technical features, technical solutions, and beneficial effects described in this embodiment can be combined in any suitable manner. Those skilled in the art will understand that embodiments can be implemented without one or more specific technical features, technical solutions, or beneficial effects of a particular embodiment. In other embodiments, additional technical features and beneficial effects may be identified in specific embodiments that do not embody all embodiments. Attached Figure Description

[0019] Figure 1 A schematic diagram illustrating an application scenario provided in an embodiment of this application; Figure 2 A flowchart illustrating a method for coordinated configuration of station optical differential protection applicable to power distribution network areas, provided in this application embodiment; Figure 3 A schematic diagram of a station optical differential protection collaborative configuration system applicable to a power distribution network area is provided in this application embodiment; Figure 4 This is a schematic diagram of a computing device provided in an embodiment of this application. Detailed Implementation

[0020] The terms "first," "second," and "third," etc., used in this application specification and accompanying drawings are used to distinguish different objects, not to limit a specific order.

[0021] In the embodiments of this application, the terms "exemplary" or "for example" are used to indicate that something is an example, illustration, or description. Any embodiment or design that is described as "exemplary" or "for example" in the embodiments of this application should not be construed as being more preferred or advantageous than other embodiments or design. Specifically, the use of the terms "exemplary" or "for example" is intended to present the relevant concepts in a specific manner.

[0022] To ensure clarity and conciseness in the description of the following embodiments, a brief introduction to the related technologies is given first: Optical differential protection, short for fiber optic current differential protection, operates on the principle of Kirchhoff's current law, comparing the vector sum of the currents at each terminal of the protected element and the differential current. When a fault occurs within the protection zone, the differential current increases, and the optical differential protection device quickly trips. This device transmits current data via optical fiber to determine if a fault has occurred in the power grid line, rapidly disconnecting the faulty circuit and preventing the power outage from spreading. When a fault occurs outside the protection zone, the differential current is theoretically zero, and the protection reliably does not trip. Therefore, it possesses absolute selectivity and rapid operation, making it the primary protection for components such as substations and power lines.

[0023] Protection settings are a set of threshold parameters that cause a protection device to start or operate, such as starting current and differential current settings. The accuracy and adaptability of protection settings directly determine the performance of the protection.

[0024] Dynamic virtual protection partitioning is a concept proposed in this application, referring to the dynamic aggregation of a group of electrically closely connected substations and lines into a single logical protection unit based on the real-time topology of the power grid. This dynamic virtual protection partitioning is not physically fixed, but rather dynamically generated and adjusted as the power grid operation mode changes.

[0025] Currently, the optical differential protection configuration of distribution networks generally adopts a static strategy. That is, protection engineers calculate and set a fixed set of protection settings offline based on a typical normal operating mode of the power grid, and then fix these settings in the protection device for long-term use.

[0026] With the widespread integration of distributed generation, the topology and power flow distribution of distribution networks have become increasingly complex and dynamic. Load shifting, fault reconfiguration, and random switching of distributed generation have become commonplace. This leads to a severe disconnect between pre-defined fixed protection zones and the actual operating electrical zones, and protection settings calculated based on fixed operating modes cannot adapt to changes in short-circuit current levels. Consequently, protection devices are highly prone to misjudging external faults as internal faults or failing to operate correctly when an internal fault occurs, even triggering cascading trips, expanding the outage area, and seriously threatening grid security. The root cause of the problem lies in the inability of traditional static configuration systems to keep pace with the dynamic changes in the power grid.

[0027] In view of this, this application provides a method for collaborative configuration of optical differential protection in substations applicable to distribution network areas. The inventive concept of this method lies in synchronous adaptation: by sensing the power grid status in real time, a virtual protection zone is dynamically constructed, and the optimal setpoints for the protection devices within the zone are collaboratively calculated using cooperative game theory, thereby realizing automatic, synchronous matching and adaptive adjustment of optical differential protection configuration with the real-time operating status of the power grid, fundamentally solving the adaptability problem of static configuration.

[0028] To make the technical solution of this application clearer and easier to understand, the application scenarios of the technical solution of this application are described below with reference to the accompanying drawings. Figure 1 As shown in the figure, this figure is a schematic diagram of an application scenario provided by an embodiment of this application.

[0029] In this application scenario, an active distribution network area includes multiple substations (such as substation A and substation B), switching stations, and a large number of connected distributed power sources (such as photovoltaic power plants and wind farms). The topology of the power grid will frequently change due to operational demands or fluctuations in distributed power sources. For example, a switch tripping operation may cause the load to be transferred from one line to another, or a photovoltaic power plant may be shut down due to weather conditions.

[0030] As shown in the diagram, substations A and B represent two key power sources or hubs in the distribution network area. The photovoltaic power station represents a distributed power source connected to the distribution network, whose output is intermittent and random. Line L1 connects substations A and B in its initial operation. Protection P1 is a fixed optical differential protection device preset for line L1, whose protection range and settings are based on this initial topology.

[0031] The "Grid Operation / Disturbance" box indicates the event source that causes a change in the grid topology. Switch K1 tripping represents a planned operational adjustment, such as load shifting. Photovoltaic shutdown represents an unplanned disturbance, such as distributed generation disconnecting from the grid for any reason. "Topology Change Caused" indicates that the above events are the direct cause of the grid evolving from state ① to state ②.

[0032] Lines L2 and L3 are new lines that assume power supply responsibilities under state ②. This change means that the main electrical path has shifted from L1 to L2 and L3. Protection P2 and protection P3 correspond to the fixed optical differential protection devices for lines L2 and L3, respectively. In the traditional mode, their settings are not updated for the current new topology. Protection P1 - Fixed setting means that the configuration of protection P1 is rigid and cannot be adjusted with topology changes.

[0033] The protection scope is out of sync with the actual operating mode: The arrow points to this problem, indicating that P1 is still protecting L1, which is no longer important, while the new critical path may not be correctly covered. Non-optimal protection settings for P2 / P3 mean that even if P2 and P3 are still in the correct positions, their settings are not the optimal values ​​calculated for the current operating mode. Risk of maloperation / failure to operate: The arrow points to this problem, meaning that mismatched settings may cause the protection system to fail to operate when it should (failure to operate), or to maloperate when it should not (maloperation). Threatening power grid security is the ultimate common consequence of the above two problems, which may lead to an expansion of the fault range and damage to system stability.

[0034] The problem in this application scenario is that the original fixed optical differential protection range may no longer be applicable after the power grid topology changes. For example, a protection device that originally only covered a certain line may no longer have a protection range that matches the actual electrical connection after the topology change. At the same time, the protection settings based on the original operating mode may not be able to adapt to the changes in short-circuit current levels under the current operating mode, which may lead to the risk of false tripping or failure to trip of the protection device.

[0035] Therefore, this application addresses this problem by first collecting real-time switch status information and operational status data of the distribution network area to accurately identify changes in the network's topology connections, and then constructing a new topology model based on this. Subsequently, based on this topology model, and with constraints of preventing islanding operation and ensuring protection selectivity, the distribution network is divided into multiple dynamic virtual protection zones. For example, currently electrically connected substations A and B, along with related lines, are aggregated into a new zone X.

[0036] Next, for partition X, a cooperative game theory model is used to perform collaborative calculations on all optical differential protection devices within it. By defining each protection device as a game participant, defining its optional protection set value combination as a strategy set, and constructing a total payoff function with the objective of optimizing the overall protection effectiveness of the partition, an optimal protection set value combination, i.e., the first protection set value, is obtained.

[0037] Finally, the system generates a setting configuration command and reliably distributes and configures this first set of protection settings to all target optical differential protection devices within zone X via a transactional synchronization method through the communication network. This ensures that zone X can operate with correct settings that match the current power grid operating state, thereby guaranteeing the accuracy and reliability of protection and effectively addressing the challenges posed by dynamic changes in the power grid topology.

[0038] To make the technical solution of this application clearer and easier to understand, the following describes a method for coordinated configuration of station optical differential protection in a distribution network area, based on the above application scenarios. For example... Figure 2 As shown in the figure, this is a flowchart of a method for coordinated configuration of station optical differential protection in a power distribution network area, provided by an embodiment of this application.

[0039] This method is applied to processing equipment, which can be a distribution network master station system, a regional protection control center, an edge computing device, a cloud platform, a dedicated computing device, or a distributed computing node. This method for collaborative configuration of station-level optical differential protection applicable to distribution network areas includes: S201. The processing equipment acquires switch status information and operation status data of the power distribution network area.

[0040] Switch status information refers to the real-time open / close position signals of all circuit breakers, disconnectors, load switches, and other equipment in the distribution network. These signals are typically collected by intelligent terminals or remote terminal units installed on switchgear and transmitted to processing equipment via the power dispatch data network or industrial Ethernet. Switch status is the most direct basis for determining the electrical topology of the power grid.

[0041] Operational status data refers to electrical quantity data that reflects the real-time operation of the power grid, mainly including three-phase voltage, three-phase current, active power, reactive power, frequency, etc., from measurement and control devices or merging units. These data describe the power flow distribution, load level, and power output of the power grid.

[0042] The processing equipment periodically or triggeredally collects switch status information and operation status data of the distribution network area from these intelligent electronic devices at the station through standard communication protocols.

[0043] This application constructs a comprehensive, efficient, and reliable data acquisition network, achieving all-round, high-precision, and low-latency real-time perception and aggregation of the distribution network's operating status. This not only provides a solid and consistent data context for subsequent topology dynamic analysis, adaptive protection partitioning, and coordinated setting optimization, ensuring that all analyses and decisions closely follow the actual physical state of the power grid, but also fundamentally guarantees the advancement and reliability of this method compared to traditional static configuration modes.

[0044] S202. The processing equipment identifies the topological connection relationship of the distribution network based on the switch status information and operating status data, and constructs a first topological model based on the topological connection relationship of the distribution network.

[0045] Based on the switch status information and operating status data of the distribution network area obtained in step S201, the processing equipment uses graph theory principles to abstract substation buses, switchyard buses, distributed power supply access points, etc., in the distribution network as vertices, and primary equipment such as circuit breakers, disconnecting switches, and their connected lines or transformers in the closed state as edges. By executing graph traversal algorithms such as depth-first search, breadth-first search, or connected component analysis, the entire network nodes are traversed, automatically and accurately identifying all sets of vertices that are electrically directly or indirectly connected, thereby resolving the real-time topology connection relationship of the distribution network.

[0046] Based on the real-time topology connections identified above, a digital power grid structure model, namely the first topology model, is constructed for efficient processing and analysis by computer programs. This model is typically formally represented using a graph data structure G=(V,E,A), where: V (vertex set) represents all bus nodes in the power grid; E (edge ​​set) represents all electrically connected lines and transformer branches; and A (attribute set) represents the corresponding operating state attributes associated with vertices and edges, such as real-time current measurements associated with edges (lines) and voltage measurements associated with vertices (buses).

[0047] One of the fundamental reasons for the failure of traditional static optical differential protection is that the definition of its protection range depends on preset and fixed topology assumptions. This step, by constructing a real-time topology model, provides a calculation basis for the subsequent dynamic synchronization of the protection range with the actual structure of the power grid. It is a transitional step from static configuration to dynamic adaptation.

[0048] This application achieves dynamic analysis and digital modeling of electrical connections in the distribution network through real-time data-driven processing. The constructed first topology model enables the protection system to perceive every change in the power grid structure, providing accurate boundary criteria for the adaptive division of dynamic virtual protection zones in subsequent steps, and ensuring that the collaboratively calculated protection settings strictly match the actual operating conditions of the power grid.

[0049] S203. The processing equipment divides the distribution network into multiple dynamic virtual protection zones based on the first topology model.

[0050] The processing equipment, based on a first topology model and a graph theory search algorithm, uses anti-islanding operation and guaranteed protection selectivity as constraints. It aggregates electrically connected substations and lines that meet these constraints to form multiple dynamic virtual protection zones. These multiple dynamic virtual protection zones include at least a target dynamic virtual protection zone. Specifically, a dynamic virtual protection zone refers to a logical protection area dynamically divided based on real-time topology. All electrical components within this zone are electrically interconnected and can be configured and coordinated as a whole for their internal protection devices. It is not an actual physical zone, but a virtual protection area divided in a computer based on the real-time connection status of the power grid, and this area dynamically adjusts as the power grid structure changes.

[0051] The processing equipment uses stable power sources in the power grid as initial seed nodes for partitioning. These stable power sources can be main grid substations or large distributed power sources with islanding capabilities. These power sources form the basis of the partitioning. Starting from each seed node, a breadth-first search algorithm is used to perform a topology traversal outwards along closed switches and connecting lines. During this process, all electrically directly connected substations and lines are included in the candidate set for the current partition. During the expansion process, the constraints of the current candidate partitions are continuously verified. Anti-islanding constraint verification ensures that the current candidate zone always contains at least one valid power source, or maintains a reliable electrical connection with the main grid via a tie switch, preventing the formation of passive islands. Protection selectivity constraint verification ensures that when the search boundary reaches a tie switch with an adjacent area, that tie switch naturally becomes the zone boundary. This ensures that in the event of a fault, protection actions can be effectively limited to within the current zone, preventing cascading tripping.

[0052] When the search can no longer be expanded, that is, when a switchgear in a tripped state is encountered or the partition boundary conditions are met and all constraints are satisfied, all stations and lines covered by the current traversal are aggregated to form a complete dynamic virtual protection partition.

[0053] After the processing device completes the partitioning of a zone, it selects a seed node that meets the criteria, such as another power source, from the remaining nodes that have never been included in any partition. This process is repeated until all electrical nodes in the distribution network are assigned to a specific dynamic virtual protection zone. This application exemplarily names the currently processed partition the target dynamic virtual protection zone.

[0054] This partitioning method achieves dynamic coupling and adaptation between the protection range and the actual power grid topology. The partitions are no longer pre-defined fixed ranges, but are dynamically generated based on real-time switch states, fundamentally solving the problem of the protection range becoming disconnected from the actual electrical connections due to changes in operating modes. This lays a correct structural foundation for subsequent steps of calculating protection settings for each partition, ensuring the effectiveness and selectivity of the protection strategy.

[0055] S204. The processing equipment, based on a cooperative game model, calculates the performance parameters of the optical differential protection device in the target dynamic virtual protection zone among multiple dynamic virtual protection zones, and obtains the first protection setting value of the target dynamic virtual protection zone.

[0056] The processing device, based on a cooperative game theory model, defines each optical differential protection device within a target dynamic virtual protection zone as a game participant; defines the optional protection set combinations of each game participant as a strategy set; based on the real-time operating status of the target dynamic virtual protection zone, it constructs a total payoff function to evaluate the overall protection effectiveness of the zone, the input of which is all game participants and the first strategy combination selected from the strategy set; by solving the cooperative game theory model, it obtains a first strategy combination that enables the total payoff function to reach a first evaluation threshold, and determines the first strategy combination as the first protection set value.

[0057] Cooperative game theory models achieve the optimal overall goal through collaborative decision-making among participants, rather than through the independent setting of individual protection devices. In dynamic virtual protection zones of distribution networks, the setting selection of each optical differential protection device affects each other (e.g., improper coordination of settings between adjacent devices may lead to maloperation / failure to operate). Therefore, a game theory model is needed to find the globally optimal combination of settings. The specific steps are as follows: Define all optical differential protection devices within the target dynamic virtual protection zone as game participants, denoted as set. Where: n represents the total number of optical differential protection devices in the target dynamic virtual protection zone. If the zone includes line protection, bus protection, etc., each independent device is a participant.

[0058] Each participant's strategy corresponds to its selectable combination of protection settings. The core settings for optical differential protection include differential current settings, starting current settings, and action delay settings. The strategy set of the i-th participant is defined as follows: Where: k is the number of selectable value combinations for the i-th device, i is a positive integer, i is less than or equal to n, and is determined by the hardware capabilities of the protection device, the range of short-circuit current in the distribution network, etc. For example, the differential current can be selected in 5 levels within the range of 0.5Ie~2Ie, where Ie is the rated current of the device. Let j represent the j-th fixed value combination of the i-th device, where j = 1, 2, ..., k.

[0059] The combination of strategies of all participants constitutes the global strategy space. Any combination of global strategies is denoted as ,in .

[0060] The payoff function is a core indicator for evaluating the effectiveness of a strategy combination. This application constructs a total payoff function with the overall protection performance of the target dynamic virtual protection zone as the objective. The overall protection performance needs to comprehensively consider three core requirements: reliability (no failure to operate during faults within the zone), selectivity (no false operation during faults outside the zone), and speed of operation (rapid operation after a fault). The specific form is as follows:

[0061] in, The total payout for the global strategy combination s. is the protection reliability index under strategy combination s. It measures the probability of the protection device operating correctly when there is a fault in the zone. It is calculated based on the simulation results of typical fault scenarios in the zone (such as three-phase short circuit, two-phase short circuit, and single-phase ground fault). The value range is [0,1]. is the protection selectivity index under strategy combination s, which measures the probability of the protection device correctly not operating when there is an external fault. It is also based on the simulation of typical external fault scenarios, and the value range is [0,1]. is the protection speed index under strategy combination s, which measures the operating speed of the protection device when a fault occurs in the zone. It must meet the fault clearing time requirements of the distribution network and has a value range of [0,1]. As the first weighting coefficient, This is the second weighting coefficient. This is the third weighting coefficient. Dynamically adjust according to the operational needs of the distribution network, such as taking [measures] in heavy-load areas. ; Distributed power generation dense areas take .

[0062] The calculation methods for each sub-indicator are as follows:

[0063]

[0064]

[0065] in, The number of preset typical fault scenarios within a partition. For example, 3 fault types × 5 fault locations = 15 scenarios; m is a positive integer less than or equal to M. This is an indicator function; it takes the value 1 if the condition within the parentheses is true, and 0 otherwise. This represents the calculated actual differential current of the protection device under strategy combination s and the m-th fault scenario. Under strategy combination s, the differential current setting of the protection device is given by K, which represents the number of typical fault scenarios preset outside the zone. Typical fault scenarios include three-phase short circuits, two-phase short circuits, and single-phase grounding faults on 10kV lines. Each type of fault covers 5 nodes within the zone, such as line faults in adjacent zones and faults on the main grid side. k is a positive integer less than or equal to K. This represents the calculated actual differential current of the protection device under strategy combination s and the k-th external fault scenario. This represents the actual operating time of the protection device under a fault scenario in strategy combination s and the m-th zone. The theoretical minimum operating time of the protection device is determined by the hardware response speed, such as 0.02s; This is the maximum allowable fault clearing time for the distribution network, such as 0.1s.

[0066] The goal of cooperative game theory is to find a total payoff function. Reaching the first assessment threshold Global strategy combination ,Right now: and ;in, This means finding, in the global policy space S, a value that makes... The largest strategy combination, This indicates the first assessment threshold, set by the distribution network safety requirements, such as... This means that the overall protection effectiveness must be no less than 90%.

[0067] Since the policy space S is a discrete set (with a finite number of fixed-value combinations), it can be solved using enumeration or heuristic algorithms. Using enumeration, we iterate through all possible policy combinations s and calculate the value of each combination. Filter out those that meet the requirements and The largest (Suitable for scenarios where n is small); if a heuristic algorithm is used, when n is large (e.g., there are more than 10 protection devices in the partition), the optimal solution can be quickly approximated through algorithmic optimization. This reduces computational complexity. Ultimately, the optimal strategy combination is... The first protection setting is determined, which includes the specific settings of each optical differential protection device in the zone (differential current, starting current, action delay, etc.).

[0068] S205. The processing equipment configures the first protection setting value to the optical differential protection device in the target dynamic virtual protection partition.

[0069] The processing device establishes a first communication topology for the target dynamic virtual protection zone, which is generated based on the electrical connection relationships in the first topology model; based on the first communication topology, a first communication path is determined to send the first protection setting to the optical differential protection device in the target dynamic virtual protection zone.

[0070] Specifically, to ensure the real-time performance and reliability of protection setting issuance, a first communication topology matching the electrical topology needs to be constructed based on the electrical connection relationship of the first topology model, and a dedicated communication path needs to be planned.

[0071] The first communication topology is a logical communication network isomorphic to the electrical topology, denoted as... ,in, For a set of communication nodes, This is a set of communication links.

[0072] Based on the first communication topology The shortest path algorithm is used to plan the communication path for the set value to be sent to each optical differential protection device, denoted as . , ,in, Let i be the communication path of the i-th device. This is the starting node for issuing the first protection setting. This is the first intermediate communication node in the communication path. Let t be the target node of the communication path, and t be the number of nodes in the communication path.

[0073] The communication path planning needs to meet the dual-path redundancy. The main path is laid along the power transmission line, and the backup path is laid along the municipal pipeline network. The physical distance between the main and backup paths is ≥1km. When the main path is interrupted, the backup path switching delay is ≤50ms to avoid the failure of a single communication link to prevent the setting from being issued. Then, the setting is issued using a transactional synchronization mechanism to ensure that the setting of all target devices is successfully issued or rolled back to avoid the protection coordination chaos caused by some devices updating the setting and some not updating. The specific process is as follows: (1) Generate setting configuration instructions based on the first protection setting. It generates standardized setting configuration instructions, with the instruction format conforming to the IEC61850 standard, including: target device identifier (such as device IP address, unique device code); a list of setting items (differential current, starting current, action delay, etc.); a check code (such as CRC32 check to ensure that the instruction is not tampered with during transmission); and a transaction number (uniquely identifying this setting issuance transaction for subsequent confirmation).

[0074] (2) Transactional synchronous distribution process: The master station sends a pre-distribution instruction to all target devices. After receiving the instruction, the device temporarily stores the set value in the buffer area, does not take effect immediately, and returns a pre-received success response. The master station waits for the pre-received success responses from all target devices. If all responses are not received within the timeout period (e.g., 5s), the pre-distribution is deemed to have failed, and a rollback is performed. If all pre-received success responses are received, the master station sends a set value activation instruction. All devices simultaneously write the set value in the buffer area into the operating area and activate it. After the device takes effect, it reads the current operating set value, compares it with the set value in the configuration instruction, and returns an activation success or activation failure response. If any device returns an activation failure, the master station sends a rollback instruction. All devices discard the buffer set value and restore the historical set value before distribution, ensuring that the protection set value status of the entire network is consistent.

[0075] The constraints for transactional synchronization are:

[0076] Where T represents the transaction for this fixed value issuance. In this setting issuance transaction T, the setting values ​​for all target devices were successfully updated and took effect. In this setting issuance transaction T, the settings of all target devices are rolled back to their state before issuance.

[0077] After the target dynamic virtual protection zone is put into operation, the operating performance indicators of the target dynamic virtual protection zone are monitored in real time; when the operating performance indicators are found to exceed the expected range, the weight parameters in the cooperative game model are adjusted and the first protection setting is recalculated; the recalculated first protection setting is configured to the optical differential protection device in the target dynamic virtual protection zone.

[0078] Specifically, after the target dynamic virtual protection zone is put into operation, its operational performance indicators need to be monitored in real time. When the indicators exceed the expected range, the setpoints should be dynamically adjusted to ensure that the protection performance remains optimal. The core indicators monitored in real time include the number of differential current over-limits (whether the setpoint is reached during faults within the zone, and whether there are false over-limits during faults outside the zone), the protection action accuracy rate (number of correct actions / total number of actions, expected range [0.95, 1]), and the fault clearing time (actual clearing time, expected range [...]). , The above metrics are integrated into a single performance evaluation value, P, calculated as follows: (The values ​​are: [0, 1 times / day]) and the number of communication link interruptions (expected range [0, 1 times / day]).

[0079] in, This is a performance evaluation value, ranging from [0,1], with an expected range of [0,1]. , The minimum expected range threshold. The threshold for the highest expected range can be set to [0.9, 1]. As the first indicator weight, As the weight of the second indicator, As the third indicator weight, and , To protect the accuracy of the movements, This is an indicator of actual speed. This is a communication reliability indicator.

[0080] When detected If necessary, perform the following adjustment steps to analyze the reasons for the low performance indicators (e.g., If it is low, then increase , If it is low, then increase Update the first weight coefficient to Update the first weight coefficient to Update the first weight coefficient to Based on the updated cooperative game model, the optimal strategy combination is re-solved. (The calculation process is the same as S204); a transactional synchronization mechanism is adopted to... The settings are sent to the target device, overriding the original first protection setting.

[0081] Establish a setting version management file for each dynamic virtual protection partition; record the protection setting, configuration time, corresponding power grid topology status and verification results for each issuance; when the power grid topology is detected to have reverted to a historical state, retrieve the corresponding historical protection setting from the setting version management file and restore the configuration to the corresponding dynamic virtual protection partition.

[0082] In this application, the processing of the first dynamic virtual protection partition is also applicable to other dynamic virtual protection partitions among multiple dynamic virtual protection partitions.

[0083] Based on the above, the processing equipment acquires switch status information and operating status data of the distribution network area; identifies the topological connection relationship of the distribution network based on the switch status information and operating status data, and constructs a first topology model based on the topological connection relationship of the distribution network; divides the distribution network into multiple dynamic virtual protection zones based on the first topology model; wherein, the multiple dynamic virtual protection zones include a target dynamic virtual protection zone; calculates the performance parameters of the optical differential protection device in the target dynamic virtual protection zone based on a cooperative game model, and obtains a first protection setting; configures the first protection setting into the optical differential protection device in the target dynamic virtual protection zone, so that the target dynamic virtual protection zone is put into operation according to the first protection setting. In the prior art, the distribution network protection zones are mostly statically divided, and the setting depends on manual experience. This has problems such as poor adaptability between the zone and the actual power grid topology, lack of global optimization of setting coordination, and insufficient coordination between devices, which can easily lead to protection maloperation, failure to operate, or excessively long operation delay, affecting the power supply reliability and fault handling efficiency of the distribution network. As can be seen, this application dynamically adapts to the power grid topology, ensuring that the protection zones are consistent with the actual electrical connections and avoiding the problem of zone misalignment; it achieves global collaborative optimization of settings through cooperative game theory, improving the reliability, selectivity and speed of protection, and reducing false trips and failures to trip; it automates the entire process, reducing reliance on manual labor and operation and maintenance costs, and improving the level of intelligent operation and maintenance; it quickly and accurately isolates faults, shortens power outage time, and ensures the reliability of power supply and the efficiency of fault handling in the distribution network.

[0084] The above text combined Figures 1 to 2 The method for coordinated configuration of station optical differential protection in distribution network areas provided in this application embodiment has been described in detail. The device and equipment provided in this application embodiment will be described below with reference to the accompanying drawings.

[0085] This application also provides a station room optical differential protection collaborative configuration system suitable for distribution network areas, such as... Figure 3 As shown in the figure, this is a schematic diagram of a station optical differential protection collaborative configuration system suitable for distribution network areas provided in an embodiment of this application. The system includes: The acquisition module 301 is used to acquire switch status information and operation status data of the distribution network area; The partitioning module 302 is used to identify the topological connection relationship of the distribution network based on switch status information and operating status data, construct a first topological model based on the topological connection relationship of the distribution network, and divide the distribution network into multiple dynamic virtual protection zones based on the first topological model. Calculation module 303 is used to calculate the performance parameters of the optical differential protection device in the target dynamic virtual protection zone based on a cooperative game model, and obtain the first protection setting value; The configuration module 304 is used to configure the first protection setting value to the optical differential protection device in the target dynamic virtual protection partition.

[0086] In some possible implementations, the calculation module 303 is specifically used to define each optical differential protection device within the target dynamic virtual protection partition as a game participant; The optional protection set combinations for each game participant are defined as the strategy set; Based on the real-time operating status of the target dynamic virtual protection partition, a total payoff function is constructed to evaluate the overall protection effectiveness of the partition. The input of the total payoff function is all game participants and the first strategy combination selected from the strategy set. By solving the cooperative game model, a first strategy combination that enables the total payoff function to reach a first evaluation threshold is obtained, and the first strategy combination is determined as the first protection setpoint.

[0087] In some possible implementations, the system further includes: The monitoring module is used to monitor the operational performance indicators of the target dynamic virtual protection partition in real time after the target dynamic virtual protection partition is put into operation. When the operational performance indicators are detected to exceed the expected range, the weight parameters in the cooperative game model are adjusted, and the first protection setpoint is recalculated. The recalculated first protection setting is configured into the optical differential protection device within the target dynamic virtual protection partition.

[0088] In some possible implementations, the configuration module 304 is specifically used to generate a setting configuration instruction and distribute the first protection setting to all target optical differential protection devices within the target dynamic virtual protection partition in a transactional synchronization manner via a communication network; wherein, the transactional synchronization ensures that the setting changes of all target devices are either all successful or all rolled back.

[0089] In some possible implementations, the system further includes: The management module is used to create a fixed-value version management profile for each dynamic virtual protection partition; Record the protection settings, configuration time, corresponding power grid topology status, and verification results for each issuance; When the power grid topology is detected to have reverted to a historical state, the corresponding historical protection settings are retrieved from the setting version management file and the configuration is restored to the corresponding dynamic virtual protection partition.

[0090] In some possible implementations, the system further includes: The sending module is used to establish a first communication topology for the target dynamic virtual protection partition, wherein the first communication topology is generated based on the electrical connection relationships in the first topology model; Based on the first communication topology, a first communication path is used to send the first protection setting to the optical differential protection device within the target dynamic virtual protection partition.

[0091] This application also provides a computing device. For example... Figure 4 As shown in the figure, this is a schematic diagram of a computing device provided in an embodiment of this application. The computing device 400 includes a bus 401, a processor 402, a communication interface 403, and a memory 404. The processor 402, the memory 404, and the communication interface 403 communicate with each other via the bus 401.

[0092] Bus 401 can be a Peripheral Component Interconnect (PCI) bus or an Extended Industry Standard Architecture (EISA) bus, etc. Buses can be categorized as address buses, data buses, control buses, etc. For ease of representation, Figure 4 The bus is represented by a single thick line, but this does not mean that there is only one bus or one type of bus.

[0093] Processor 402 can be any one or more of the following processors: central processing unit (CPU), graphics processing unit (GPU), microprocessor (MP), or digital signal processor (DSP).

[0094] Communication interface 403 is used for communication with external devices.

[0095] Memory 404 may include volatile memory, such as random access memory (RAM). Memory 404 may also include non-volatile memory, such as read-only memory (ROM), flash memory, hard disk drive (HDD), or solid state drive (SSD).

[0096] The memory 404 stores executable code, and the processor 402 executes the executable code to perform the aforementioned station optical differential protection collaborative configuration method applicable to the distribution network area.

[0097] This application also provides a computer-readable storage medium. The computer-readable storage medium can be any available medium capable of being stored by a computing device, or a data storage device such as a data center containing one or more available media. The available medium can be a magnetic medium (e.g., floppy disk, hard disk, magnetic tape), an optical medium (e.g., DVD), or a semiconductor medium (e.g., solid-state drive). The computer-readable storage medium includes instructions that instruct the computing device to execute the above-described substation optical differential protection collaborative configuration method applicable to distribution network areas.

[0098] This application also provides a computer program product comprising one or more computer instructions. When the computer instructions are loaded and executed on a computing device, all or part of the processes or functions described in this application are generated.

[0099] The computer instructions may be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another. For example, the computer instructions may be transmitted from one website, computer, or data center to another website, computer, or data center via wired (e.g., coaxial cable, fiber optic) or wireless (e.g., infrared, wireless, microwave, etc.) means.

[0100] When the computer program product is executed by a computer, the computer executes any of the aforementioned methods of the substation optical differential protection collaborative configuration method applicable to distribution network areas. The computer program product can be a software installation package; when any of the aforementioned methods of the substation optical differential protection collaborative configuration method applicable to distribution network areas is required, the computer program product can be downloaded and executed on the computer.

[0101] The descriptions of the processes or structures corresponding to the above figures each have their own emphasis. For parts of a process or structure that are not described in detail, please refer to the relevant descriptions of other processes or structures.

[0102] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any changes or substitutions within the technical scope disclosed in this application should be covered within the scope of protection of this application.

Claims

1. A method for coordinated configuration of station optical differential protection in a distribution network area, characterized in that, The method includes: Acquire switch status information and operational status data for the power distribution network area; The topological connections of the distribution network are identified based on switch status information and operating status data, and a first topological model is constructed based on the topological connections of the distribution network. Based on the first topology model, the distribution network is divided into multiple dynamic virtual protection zones; Based on a cooperative game model, the performance parameters of the optical differential protection device in the target dynamic virtual protection zone among multiple dynamic virtual protection zones are calculated to obtain the first protection setting value of the target dynamic virtual protection zone. Configure the first protection setting into the optical differential protection device within the target dynamic virtual protection partition.

2. The method according to claim 1, characterized in that, The division of the distribution network into multiple dynamic virtual protection zones based on the first topology model includes: Based on the first topology model and graph theory search algorithm, anti-islanding operation and protection selectivity are taken as constraints. Stations and lines that meet the constraints and are electrically connected are aggregated to obtain multiple dynamic virtual protection zones.

3. The method according to claim 1, characterized in that, The method based on a cooperative game theory model calculates the performance parameters of the optical differential protection device within a target dynamic virtual protection zone in multiple dynamic virtual protection zones, obtaining the first protection setting value for the target dynamic virtual protection zone, including: Each optical differential protection device within the target dynamic virtual protection partition is defined as a game participant; The optional protection set combinations for each game participant are defined as the strategy set; Based on the real-time operating status of the target dynamic virtual protection partition, a total payoff function is constructed to evaluate the overall protection effectiveness of the partition. The input of the total payoff function is all game participants and the first strategy combination selected from the strategy set. By solving the cooperative game model, a first strategy combination that enables the total payoff function to reach a first evaluation threshold is obtained, and the first strategy combination is determined as the first protection setpoint.

4. The method according to claim 1, characterized in that, The method further includes: After the target dynamic virtual protection partition is put into operation, the operating performance indicators of the target dynamic virtual protection partition are monitored in real time. When the operational performance indicators are detected to exceed the expected range, the weight parameters in the cooperative game model are adjusted, and the first protection setpoint is recalculated. The recalculated first protection setting is configured into the optical differential protection device within the target dynamic virtual protection partition.

5. The method according to claim 1, characterized in that, The step of configuring the first protection setting value to the optical differential protection device within the target dynamic virtual protection partition includes: A setting configuration instruction is generated, and the first protection setting is sent to all target optical differential protection devices within the target dynamic virtual protection partition via a communication network in a transactional synchronization manner; wherein, the transactional synchronization ensures that the setting changes of all target devices are either all successful or all rolled back.

6. The method according to claim 1, characterized in that, The method further includes: Establish a fixed-value version management file for each dynamic virtual protection partition; Record the protection settings, configuration time, corresponding power grid topology status, and verification results for each issuance; When the power grid topology is detected to have reverted to a historical state, the corresponding historical protection settings are retrieved from the setting version management file and the configuration is restored to the corresponding dynamic virtual protection partition.

7. The method according to claim 1, characterized in that, The method further includes: A first communication topology is established for the target dynamic virtual protection partition, and the first communication topology is generated based on the electrical connection relationships in the first topology model; Based on the first communication topology, a first communication path is used to send the first protection setting to the optical differential protection device within the target dynamic virtual protection partition.

8. A station room optical differential protection collaborative configuration system suitable for distribution network areas, characterized in that, The device includes: The acquisition module is used to acquire switch status information and operating status data of the distribution network area; The partitioning module is used to identify the topological connection relationship of the distribution network based on switch status information and operating status data, construct a first topological model based on the topological connection relationship of the distribution network, and divide the distribution network into multiple dynamic virtual protection zones based on the first topological model; The calculation module is used to calculate the performance parameters of the optical differential protection device in the target dynamic virtual protection zone among multiple dynamic virtual protection zones based on a cooperative game model, and to obtain the first protection setting value of the target dynamic virtual protection zone. The configuration module is used to configure the first protection setting value to the optical differential protection device within the target dynamic virtual protection partition.

9. A computing device, characterized in that, Including memory and processor; The memory stores one or more computer programs, the one or more computer programs including instructions; when the instructions are executed by the processor, the computing device performs the method as described in any one of claims 1 to 7.

10. A computer-readable storage medium, characterized in that, The computer-readable storage medium is used to store a computer program for performing the method as described in any one of claims 1 to 7.

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