Power distribution network feeder terminal with adaptive network topology and control method thereof

Abstract

This application discloses a distribution network feeder terminal with an adaptive network topology and its control method, relating to the field of power distribution equipment technology. The distribution network feeder terminal includes a topology construction module, which constructs an adaptive network topology based on terminal equipment information within the target jurisdiction and connects to a dynamic update interface that supports dynamic updates; a communication module, which communicates with adjacent terminals based on a preset standardized protocol to realize topology information exchange; a fault handling module, which performs fault location, isolation, and recovery operations through current detection and interaction with commands from adjacent terminals, and outputs fault handling results; and an adaptive update unit, which removes the corresponding fault nodes and updates the adaptive network topology based on the fault handling results. This application effectively solves the problem of excessive dependence on the logical control center of the distribution automation master station in feeder automation strategies, and improves the fault control efficiency of feeder automation.

Description

Technical Field

[0001] This application relates to the field of power distribution equipment technology, and in particular to a power distribution network feeder terminal with an adaptive network topology and its control method. Background Technology

[0002] A feeder terminal unit (FTU) is a switch monitoring device installed next to the feeder switch. It is mainly used to monitor feeders in the distribution system and has functions such as remote control, remote signaling, remote measurement, and fault detection. It can communicate with the distribution automation master station to upload line operation data and provide monitoring information for various parameters of the distribution system. Distribution network self-healing control refers to the ability to self-prevent, regulate, and recover. Specifically, it is reflected in real-time monitoring and fault early warning of the distribution system. When a fault occurs, self-healing control will locate the fault, isolate the fault, and quickly restore the functions of the non-faulty areas. Self-healing control is performed by feeder automation (FA).

[0003] Currently, the feeder automation strategies used in the distribution network feeder terminals already in operation on the market have the problem of being overly dependent on the logic control center of the distribution automation master station. This can easily lead to malfunctions in the logic control center of the distribution automation master station and failure of the feeder automation strategy functions, indicating room for improvement. Summary of the Invention

[0004] To effectively address the problem of excessive dependence on the logical control center of the distribution automation master station in feeder automation strategies and improve the fault control efficiency of feeder automation, this application provides a distribution network feeder terminal with an adaptive network topology and its control method.

[0005] Firstly, the objective of this invention is achieved through the following technical solution:

[0006] Distribution network feeder terminals with adaptive network topology include:

[0007] The topology building module constructs an adaptive network topology based on the terminal device information within the target jurisdiction and connects to a dynamic update interface that supports dynamic updates.

[0008] The communication module communicates with adjacent terminals based on a preset standardized protocol to achieve topology information exchange;

[0009] The fault handling module performs fault location, isolation and recovery operations through current detection and interaction with adjacent terminal commands, and outputs the fault handling results.

[0010] The adaptive update unit removes the corresponding faulty nodes and updates the adaptive network topology based on the fault handling results.

[0011] By adopting the above technical solution, the target jurisdiction refers to the operation and maintenance jurisdiction of the distribution automation master station, which can include multiple distribution automation master stations. The specific size of the jurisdiction is customized according to the actual application scenario. The preset standardized protocol includes the IEC61850 standard protocol. Multiple feeder terminals communicate and interact based on the same communication protocol, which is conducive to improving the communication efficiency of distribution network feeder terminals. Specifically, in order to effectively solve the problem of excessive dependence on the logical control center of the distribution automation master station in the feeder automation strategy and improve the fault control efficiency of feeder automation, the topology construction module of this application has the effects of dynamic update and topology construction. For example, it connects to a dynamic update interface that supports hot-swapping, reducing the dependence on the distribution automation master station. Through the local topology information stored locally by the feeder terminal and the dynamic update interface, it supports plug-and-play of new devices (such as switches and substations). The adaptive network topology model is automatically generated. This approach helps reduce the complexity of system deployment across the entire target area. When the distribution network topology changes (e.g., adding nodes or adjusting equipment), only the local topology model of the terminal needs to be updated and the information of adjacent terminals needs to be synchronized, without reconfiguring the entire network, thus achieving dynamic adaptation of the network topology. Furthermore, it meets the plug-and-play requirement through standardized protocol support. It also enables rapid fault location, based on current detection and status interaction with adjacent terminals. If a terminal detects a fault current while its downstream terminal does not, the fault interval is accurately located as the area between the two, avoiding misjudgment. After fault handling is completed, the adaptive update unit automatically removes the faulty node and generates a new topology model, avoiding the impact of the faulty node on subsequent operation and maintenance, and ensuring the long-term stability of the system. This application has fully automated operation functions for dynamic topology updates and fault self-healing processes, reducing the workload of operation and maintenance personnel and improving the level of intelligent operation and maintenance of the distribution network.

[0012] In a preferred embodiment of this application: the topology building module supports hierarchical queries, and the communication latency of hierarchical queries is within a preset latency threshold. The specific process includes:

[0013] Send topology query commands to adjacent terminals to obtain the on / off status, local topology, and IP address of the upper-level and lower-level terminals;

[0014] The information returned by terminals at each level is recursively combined to generate a complete network topology diagram.

[0015] By adopting the above technical solutions, the topology construction module has a hierarchical query function and a preset latency threshold such as 200ms, which effectively reduces the problem of slow fault handling caused by latency issues between terminals; by associating IP addresses and switch status, it eliminates virtual connection nodes and achieves high accuracy in the topology model.

[0016] In a preferred embodiment of this application, the fault location operation of the fault handling module includes:

[0017] When the upper-level terminal detects a fault current, it sends a status query command to the lower-level terminal and obtains the current signal;

[0018] If the lower-level terminal does not feed back a current signal, the fault range is determined to be the area between the upper-level terminal and the lower-level terminal.

[0019] The isolation and recovery operations of the fault handling module include:

[0020] The upstream terminal disconnects and isolates the faulty area, while the downstream terminal remains closed.

[0021] After receiving the successful trip signal, the corresponding communication switch of the upper-level terminal closes the circuit breaker, restoring power supply to the non-faulty area.

[0022] By adopting the above technical solution, based on the joint analysis of current signals and status query commands, the fault can be accurately located, and the isolation and recovery operations of the fault handling module can effectively avoid the control of the power outage range when a fault occurs, thus preventing the power outage range from expanding.

[0023] In a preferred embodiment of this application: the dynamic update interface supports hot-swappable configuration; the terminal device information includes device identifier, device connection relationship and attributes; the preset standardized protocol includes the IEC61850 standard protocol.

[0024] By adopting the above technical solution, it differs from the shortcomings of existing technologies that cannot be plugged and played, resulting in high construction costs. When the power distribution system adds lines, such as adding circuit breakers or substations, it is equivalent to adding new nodes. At this time, the node information needs to be updated synchronously. Hot-swappable configuration helps to save construction costs.

[0025] Secondly, the objective of this invention is achieved through the following technical solution:

[0026] A control method for a distribution network feeder terminal with an adaptive network topology, applied to the distribution network feeder terminal with an adaptive network topology as described above, the control method comprising:

[0027] Collect terminal device information within the target jurisdiction, construct an adaptive network topology, and implement the configuration of the adaptive network topology to support dynamic updates based on a dynamic update interface;

[0028] Based on a pre-defined standardized protocol, it communicates with adjacent terminals to achieve topology information exchange;

[0029] By detecting the current and interacting with commands from adjacent terminals, the system performs fault location, isolation, and recovery operations, and outputs the corresponding fault handling results.

[0030] Based on the fault handling results, the corresponding faulty nodes are removed, and the adaptive network topology is updated in real time.

[0031] By adopting the above technical solution, a full lifecycle management method with adaptive network topology is provided, which realizes full-process automated management from equipment information collection to topology update, and has full-process fault handling of fault detection, isolation and recovery. It effectively solves the problem of excessive dependence on the logical control center of the distribution automation master station in the feeder automation strategy, and improves the fault control efficiency of feeder automation.

[0032] In a preferred embodiment of this application, the control method further includes:

[0033] Obtain network operation data within the target jurisdiction and extract key performance indicators from the network operation data;

[0034] Based on the operational data, the current network topology status is identified, and the current network topology status is matched with a preset standard network topology model to determine whether the working mode of the feeder terminal needs to be adjusted.

[0035] The system has preset first and second working modes for different network topologies; the first working mode is selected when the network topology is identified as being in a standard state, and the second working mode is selected otherwise.

[0036] The network operation data is analyzed according to the working mode to obtain different monitoring and analysis results;

[0037] Execute corresponding control strategies based on different monitoring and analysis results.

[0038] By adopting the above technical solutions, the matching of the topology structure with the standard model is achieved, and the accuracy of switching operating modes is high. By monitoring key performance indicators of network operation data in real time (such as voltage level, current intensity and power factor) and setting corresponding thresholds according to different operating modes, abnormal situations in the power grid can be detected and handled in a timely manner, thereby ensuring the stability and reliability of power supply.

[0039] In a preferred embodiment of this application: the key performance indicators include voltage level, current intensity, and power factor; the analysis of the network operating data according to the operating mode specifically includes:

[0040] In the first operating mode, the voltage level is compared with a preset first voltage threshold, and the current intensity is compared with a preset first current threshold;

[0041] When the voltage level or current intensity exceeds the corresponding threshold, a preset self-diagnostic program is activated and abnormal events are recorded to obtain the first monitoring and analysis results.

[0042] In the second working mode, it monitors for changes in network topology and adds detection of dynamic parameters;

[0043] The dynamic parameters are compared with preset second voltage thresholds and second current thresholds to obtain the second monitoring and analysis results.

[0044] By adopting the above technical solutions, we can accurately distinguish between normal operation data and abnormal operation data, and predict potential problem sources in advance to achieve fault warning. Through in-depth analysis of power parameter values ​​(such as voltage fluctuation values, current intensity change rate and power factor stability rate) and the adoption of multi-level threshold judgment rules, we can enhance the fault prevention capability of the distribution network system.

[0045] In a preferred embodiment, after identifying the current network topology state based on the operational data and matching the current network topology state with a preset standard network topology model, this application further includes:

[0046] Based on the operational data, the corresponding power parameter values ​​are obtained, including voltage fluctuation value, current intensity change rate, and power factor stability rate.

[0047] According to the threshold judgment rule in the preset control strategy, the voltage fluctuation is compared with the first voltage fluctuation threshold and the second voltage fluctuation threshold respectively, wherein the first voltage fluctuation threshold is less than the second voltage fluctuation threshold;

[0048] When the voltage fluctuation value is less than the first voltage fluctuation threshold, the corresponding operating data is classified as normal operating data; when the voltage fluctuation value is greater than the second voltage fluctuation threshold, the current intensity change rate and the corresponding network topology information of the same feeder segment within a specified time period are obtained.

[0049] When the network topology information corresponding to the same feeder segment is consistent, the corresponding operating data where the current intensity change rate of the same feeder segment exceeds the preset change rate threshold is classified as abnormal operating data.

[0050] An error message is triggered based on the abnormal operation data.

[0051] By adopting the above technical solution and introducing a fault level analysis mechanism, corresponding isolation measures can be taken for faults of different severity. When facing the second fault level, the faulty equipment is marked as unavailable and a topology reconfiguration command is triggered to update the network topology. This not only helps to quickly restore power supply, but also optimizes the network structure and improves the overall system's resilience.

[0052] In a preferred embodiment, this application includes:

[0053] When performing isolation operations, the fault handling module analyzes the fault level of the fault area to obtain the first fault level and the second fault level.

[0054] At the first fault level, the corresponding terminal is controlled to automatically cut off the power supply to the faulty segment and send an isolation report to the main station.

[0055] At the second fault level, the faulty device is marked as unavailable, triggering a topology reconfiguration command to update the adaptive network topology.

[0056] After the isolation operation is completed, the fault handling module performs a fault recovery operation and obtains fault recovery operation feedback information; based on the fault recovery operation feedback information, it determines whether to trigger the manual access process.

[0057] By adopting the above technical solutions, the fault level of the fault area is divided into the first fault level and the second fault level. A graded response mechanism is adopted according to the specific circumstances of the fault. The dynamic adjustment capability enables the distribution network to respond to emergencies more flexibly and reduces the risk of large-scale power outages caused by single-point faults.

[0058] In a preferred embodiment, the communication module sets communication priorities based on different levels of terminals;

[0059] When updating the adaptive network topology, the adaptive update unit prioritizes an incremental update strategy in the first working mode and enables a full reconstruction strategy in the second working mode.

[0060] By adopting the above technical solution, the communication priority is set based on the actual terminal equipment (e.g., master station command > neighboring terminal negotiation > local decision) to avoid command conflicts; the first working mode is the normal operation mode, in which incremental updates are given priority, which helps to reduce the computational load of the distribution network system; the second working mode is the abnormal operation mode (or line transformation mode), in which the full reconstruction strategy is initiated to ensure the accuracy of the entire adaptive network topology model.

[0061] In summary, this application includes at least one of the following beneficial technical effects:

[0062] 1. The topology building module has the effects of dynamic updating and topology building. For example, it supports hot-swappable dynamic update interfaces, reducing the dependence on the distribution automation master station. Through the local topology information stored locally in the feeder terminal and the dynamic update interface, it supports the plug-and-play of new devices (such as switches and substations). The adaptive network topology model is automatically generated, which helps to reduce the system deployment complexity of the entire target jurisdiction.

[0063] 2. Employing an incremental update strategy (in the first working mode) and a full reconstruction strategy (in the second working mode), the most suitable update method can be flexibly selected according to the actual situation. Incremental updates reduce unnecessary data transmission and lower system overhead; while full reconstruction is suitable for more complex changing scenarios, ensuring the accuracy and integrity of the network topology.

[0064] 3. By setting different communication priorities according to the terminal level, critical data and urgent information can be transmitted and processed in the shortest possible time, ensuring the effectiveness and timeliness of communication. Attached Figure Description

[0065] Figure 1 This is a frame diagram of a distribution network feeder terminal with an adaptive network topology in one embodiment of this application;

[0066] Figure 2 This is a flowchart of an intelligent operation and maintenance distribution network feeder terminal with a fault self-healing strategy for a distribution network feeder terminal having an adaptive network topology in one embodiment of this application.

[0067] Figure 3 This is a typical network topology model diagram of a distribution network feeder terminal with an adaptive network topology in one embodiment of this application;

[0068] Figure 4 This is a topology diagram of an application example of a distribution network feeder terminal with an adaptive network topology according to an embodiment of this application;

[0069] Figure 5 This is a diagram showing the network topology change of a distribution network feeder terminal with an adaptive network topology in one embodiment of this application when a new node is added;

[0070] Figure 6 This is a flowchart of a control method for a distribution network feeder terminal with an adaptive network topology in one embodiment of this application. Detailed Implementation

[0071] The present application will be further described in detail below with reference to the accompanying drawings.

[0072] In one embodiment, such as Figure 1As shown, this application discloses a distribution network feeder terminal with an adaptive network topology. The distribution network feeder terminal with an adaptive network topology includes a topology construction module, a communication module, a fault handling module, and an adaptive update unit, wherein the adaptive update unit is located in the topology construction module. Specifically, the topology construction module constructs an adaptive network topology based on terminal equipment information within the target jurisdiction and connects to a dynamic update interface that supports dynamic updates. The terminal equipment information includes equipment identifiers, equipment connection relationships, and attributes. The communication module communicates with adjacent terminals based on a preset standardized protocol to realize topology information exchange. The preset standardized protocol is the IEC61850 standard protocol. The fault handling module... The block performs fault location, isolation, and recovery operations through current detection and interaction with adjacent terminal commands, and outputs the fault handling results. The adaptive update unit removes the corresponding fault nodes and updates the adaptive network topology based on the fault handling results. That is, after the fault handling is completed, the adaptive update unit automatically marks the fault nodes as unavailable and generates a new topology model after excluding the fault nodes through the topology reconstruction algorithm. When the dynamic update interface of this application detects new equipment (such as switches or substations), it automatically obtains equipment information and generates a new local topology model through a standardized protocol. Moreover, the dynamic update interface supports hot-swappable configuration and can complete the topology integration of new equipment without relying on the master station or external control center.

[0073] The topology building module supports hierarchical queries, with communication latency within a preset latency threshold (e.g., 50ms). The specific process is as follows: when no changes in the current adaptive network topology are detected, the communication nodes in the adaptive network topology communicate with each other using the IEC61850 standard protocol to send topology query commands to adjacent terminals, obtain the switch status, local topology, and IP addresses of the upper-level and lower-level terminals, and recursively combine the information returned by each level of terminals to generate a complete network topology map.

[0074] The fault location operation of the fault handling module includes:

[0075] When the upstream terminal detects a fault current, it sends a status query command to the downstream terminal and obtains the current signal. If the downstream terminal does not return a current signal, the fault range is determined to be the area between the upstream terminal and the downstream terminal. During the fault location process, if the communication between adjacent terminals is interrupted, the fault range is inferred through the locally stored topology information.

[0076] The isolation and recovery operations of the fault handling module include:

[0077] The upper-level terminal trips to isolate the faulty area, while the lower-level terminal remains closed. The corresponding tie switch of the upper-level terminal closes after receiving the successful trip signal, restoring power supply to the non-faulty area. Specifically, if the terminal monitors the switch status as closed, it sends a trip command, and the switch trips according to the command and returns a successful trip signal. If the terminal monitors the switch status as open, no action is required, thus completing the fault isolation.

[0078] The adaptive update unit further supports a manual verification mode, allowing maintenance personnel to manually correct abnormal nodes in the topology model.

[0079] To facilitate the explanation of the application of distribution network feeder terminals with adaptive network topology, the following is an example application scenario:

[0080] like Figure 2 As shown, Figure 2 This document presents a flowchart for a smart distribution network feeder terminal system with an adaptive network topology (FA) fault self-healing strategy. First, it obtains information on the terminal equipment within the designated jurisdiction. Based on the actual line conditions, circuit breakers, load switches, and tie switches are considered as communication nodes. To address the issue of high construction costs due to the inability to use a plug-and-play solution, communication between nodes uniformly adopts the IEC 61850 standard protocol. Figure 2 The diagram illustrates the process of updating node information synchronously when circuit breakers, substations, or other equipment are added to a line, which is equivalent to adding new nodes.

[0081] Furthermore, when the fault handling module uses a step-by-step query method to self-identify and generate a network topology model, such as... Figures 3 to 5 As shown, Figure 3 This is a typical network topology model diagram, generated based on the terminal's own monitoring equipment and the connection relationships and device attributes between devices within the monitoring area. The intelligent China-Europe segment in the diagram stores a local network topology diagram, such as... Figure 4 As shown, taking the smart terminals FTU2 and FTU3 as examples; Figure 4 As shown in (a), the device monitored by FTU2 is load switch K2, and the devices directly connected to it are load switches K1, K3, and K8. Figure 4 (a) Generate the network topology and store it in the smart terminal FTU2; Figure 4 (b) The area monitored by FTU3 is the substation, where the directly connected equipment is load switch K3, K4, K11, K12, and K13, and the load switches K2, K6, and K10 are directly connected to these devices. Figure 4 (b) Generate the network topology and store it in the smart terminal FTU3.

[0082] like Figure 5As shown, if the monitoring range of intelligent terminal FTU2 is affected by line modifications, resulting in the addition of load switches and substations, only the nodes need to be changed to generate a new network topology model, achieving self-adaptation. The intelligent terminal monitoring load switch K2 is FTU2. FTU2 sends query commands to its neighboring intelligent terminals FTU1 and FTU3. Upon receiving the command, intelligent terminal FTU1 returns the switch status and local topology parameters. FTU2 learns that intelligent terminal FTU1 is monitoring the substation outlet circuit breaker and ends the query. After receiving the command, intelligent switch FTU3 returns the switch status, local topology parameters, and the IP address of intelligent terminal FTU4. Based on the returned local topology parameters, intelligent terminal FTU2 knows that intelligent terminal FTU3 is not the last node. Based on the IP address, it sends a query command to intelligent terminal FTU4. Intelligent terminal FTU4 returns the switch status, local topology parameters, and the IP address of the neighboring intelligent terminal FTU5. Based on the IP address, FTU2 sends a query command to intelligent terminal FTU5. Intelligent terminal FTU5 returns the switch status and local topology parameters. FTU2 learns that intelligent terminal FTU5 is monitoring the tie switch and ends the query.

[0083] The working principle of a distribution network feeder terminal with adaptive network topology is as follows: The topology construction module of this application has the effects of dynamic updating and topology construction. For example, it connects to a dynamic update interface that supports hot-swapping, reducing the dependence on the distribution automation master station. Through the local topology information stored locally in the feeder terminal and the dynamic update interface, it supports plug-and-play addition of new equipment (such as switches and substations). The adaptive network topology model is automatically generated, which helps to reduce the system deployment complexity of the entire target jurisdiction. When the distribution network topology changes (such as adding nodes or adjusting equipment), it is only necessary to update the local topology model of the terminal and synchronize the information of adjacent terminals. There is no need to reconfigure the entire network, thus realizing the dynamic adaptation of the network topology.

[0084] In one embodiment, such as Figure 6 As shown, a control method for a distribution network feeder terminal with an adaptive network topology is provided. This control method is applied to a distribution network feeder terminal with an adaptive network topology and specifically includes the following steps:

[0085] S1: Collect terminal device information within the target jurisdiction, construct an adaptive network topology, and implement a configuration that supports dynamic updates of the adaptive network topology based on a dynamic update interface.

[0086] In this embodiment, the target jurisdiction refers to the operation and maintenance jurisdiction of the distribution automation master station, which may include multiple distribution automation master stations. The specific size of the scope can be customized according to the actual application scenario. The terminal device information includes the device identifier (unique product information code), device connection relationship and attributes. The dynamic update interface is an interface that allows the distribution network system to add, delete or modify node information in the network in real time.

[0087] S2: Based on a preset standardized protocol, it communicates with adjacent terminals to realize topology information exchange.

[0088] In this embodiment, topology information interaction refers to the exchange of information between different terminals about their own status, the connection relationship between upper and lower level terminals, and the surrounding environment.

[0089] S3: By detecting the current and interacting with commands from adjacent terminals, it performs fault location, isolation and recovery operations, and outputs the corresponding fault handling results.

[0090] In this embodiment, current monitoring devices are installed at key locations to set up monitoring points; when an anomaly is detected, fault analysis is performed by combining information from adjacent terminals; the fault handling results include the exact location of the fault, the scope of impact, and the remedial measures already taken, such as identifying which nodes need to be marked as unavailable.

[0091] S4: Remove the corresponding faulty nodes based on the fault handling results and update the adaptive network topology in real time.

[0092] In this embodiment, updating the adaptive network topology includes identifying newly added line nodes, identifying which nodes need to be marked as unavailable, adjusting network connectivity in conjunction with removed faulty nodes, and checking whether the updated network topology correctly reflects the current network status after the update.

[0093] In one embodiment, the control method for a distribution network feeder terminal with an adaptive network topology further includes:

[0094] S10: Obtain network operation data within the target jurisdiction and extract key performance indicators from the network operation data.

[0095] In this embodiment, network operation data includes electrical parameters such as voltage, current, and power factor, as well as device status information (such as switch position); key performance indicators include voltage level, current intensity, and power factor.

[0096] Specifically, voltage sensors, current transformers, and other equipment are installed at different nodes of the distribution network to collect electrical parameters in real time and store them in the database of the distribution network system.

[0097] S20: Identify the current network topology status based on the operating data, match the current network topology status with the preset standard network topology model, and determine whether it is necessary to adjust the working mode of the feeder terminal.

[0098] In this embodiment, the network topology state is used to describe the connection relationship between various components (such as substations, transformers, circuit breakers, etc.) in the power grid; the standard network topology model refers to an ideal power grid architecture diagram, which includes the device connection methods under all normal operating conditions.

[0099] Specifically, the actual network topology is identified based on the topology recognition algorithm, and the identified network topology is compared with the standard model to check for differences (such as a broken line or a node being removed).

[0100] In this embodiment, after step S20, the following step is also included:

[0101] S201: Obtain the corresponding power parameter values ​​based on the operating data. The power parameter values ​​include voltage fluctuation value, current intensity change rate and power factor stability rate.

[0102] Specifically, voltage fluctuation refers to the range of voltage variation over a certain period of time, reflecting the stability of the power grid; current intensity change rate refers to the amount of current change per unit time, used to detect abnormal loads or faults in the power grid; power factor stability rate is an indicator for measuring the efficiency of power utilization in the power grid, and is related to the reactive power of the distribution network system.

[0103] S202: Based on the threshold judgment rules in the preset control strategy, the voltage fluctuation is compared with the first voltage fluctuation threshold and the second voltage fluctuation threshold respectively, wherein the first voltage fluctuation threshold is less than the second voltage fluctuation threshold.

[0104] S203: When the voltage fluctuation value is less than the first voltage fluctuation threshold, the corresponding operating data is classified as normal operating data; when the voltage fluctuation value is greater than the second voltage fluctuation threshold, the current intensity change rate and the corresponding network topology information of the same feeder segment within a specified time period are obtained.

[0105] Specifically, the specified time period refers to a preset time analysis window, such as 30 seconds.

[0106] S204: When the network topology information corresponding to the same feeder segment is consistent, the corresponding operating data where the rate of change of current intensity of the same feeder segment exceeds the preset rate of change threshold is classified as abnormal operating data.

[0107] Specifically, the rate of change threshold refers to a standard range used to determine whether changes in current intensity exceed the normal range.

[0108] S205: Trigger an exception prompt instruction based on abnormal operation data.

[0109] S30: Preset first and second working modes for different network topologies; select the first working mode when the network topology is identified as being in a standard state, otherwise select the second working mode.

[0110] In this embodiment, the first working mode is the normal operation mode, in which incremental updates are preferred, which helps to reduce the computational load of the distribution network system. It is suitable for the normal operation mode when the network is in a standard state, focusing on daily monitoring and maintenance. The second working mode is the abnormal operation mode (or line transformation mode). The second working mode is suitable for the operation mode when the network structure changes, emphasizing rapid response and fault recovery.

[0111] Specifically, the tasks to be performed in each operating mode should be clearly defined. For example, in the first operating mode, routine monitoring is mainly performed, while in the second operating mode, the monitoring frequency for abnormal situations is increased. At the same time, a mode switching mechanism can be set up, such as implementing automated logical judgment to automatically switch from one mode to another when a topology change is detected.

[0112] S40: Analyze network operation data according to the working mode to obtain different monitoring and analysis results.

[0113] In this embodiment, key performance indicators include voltage level, current intensity, and power factor; step S40 includes:

[0114] S401: In the first operating mode, the voltage level is compared with a preset first voltage threshold, and the current intensity is compared with a preset first current threshold.

[0115] Specifically, voltage level refers to the voltage value at various points in the power grid, which is an important parameter for assessing the stability of the power grid and the power quality; current intensity refers to the magnitude of the current flowing through the circuit, reflecting the load conditions and the load status of the power grid; power factor is an indicator that measures the ratio of active power to apparent power in the power grid, affecting the efficiency and energy consumption of the power system.

[0116] In this embodiment, the second current threshold is more sensitive than the first current threshold, with the aim of capturing minute changes that may cause problems; the second voltage threshold is located between the first voltage threshold and is more stringent than the first voltage threshold, used to quickly identify and respond to any small fluctuations that may affect the stability of the power grid.

[0117] For example, suppose there is a city power distribution network system. Considering the changes in peak and off-peak electricity consumption, the first voltage threshold can be set to 220V ± 10% (i.e., 200V to 242V). The first current threshold is based on the maximum carrying capacity of the transformer and cable. Assuming the maximum rated current of the main line is 500A, the first current threshold can be set to 80% of the rated value, i.e., 400A. When a change in the network topology is detected (e.g., the addition of a high-power user or the reconnection of some lines after maintenance), and the system enters the second operating mode, the second voltage threshold can be tightened to 220V ± 5% (i.e., 209V to 231V) for more precise control. Similarly, in the second operating mode, due to the unstable state of the power grid, the second current threshold should be more conservative, for example, set to 350A.

[0118] S402: When the voltage level or current intensity is detected to exceed the corresponding threshold, a preset self-diagnostic program is started and the abnormal event is recorded to obtain the first monitoring and analysis result.

[0119] Specifically, the first monitoring analysis results include the timestamps, location information and possible causes of abnormal events; the self-diagnosis program refers to an automated fault detection mechanism, including but not limited to checking other relevant parameters (such as temperature) and querying historical data for comparison.

[0120] S403: In the second operating mode, monitor for changes in network topology and increase the detection of dynamic parameters.

[0121] Specifically, network topology changes refer to changes in the way equipment is connected within the power grid, which may be caused by the addition of new equipment or the removal of old equipment; dynamic parameters, in addition to basic voltage and current, also include factors that change over time, such as temporary connection points and moving loads.

[0122] S404: Compare the dynamic parameters with the preset second voltage threshold and second current threshold; obtain the second monitoring and analysis result.

[0123] S50: Execute corresponding control strategies based on different monitoring and analysis results.

[0124] In this embodiment, in the first operating mode, if the voltage fluctuation is within the first voltage threshold range (e.g., 220V ± 10%, i.e., 200V to 242V), the current intensity is lower than the first current threshold (e.g., not exceeding 400A), and the power factor is stable and meets the standard requirements, then the control strategy is to continue maintaining the existing operating mode. In the second operating mode, if the voltage fluctuation is close to but does not exceed the second voltage threshold (e.g., 220V ± 5%, i.e., 209V to 231V), and the current intensity is slightly higher than normal but still within the safe range (e.g., exceeding 350A but not exceeding 400A), and an increase in local area load is detected leading to a decrease in the power factor, then the monitoring frequency is increased and the load distribution is dynamically adjusted, such as by redistributing some loads through smart grid technology to alleviate the pressure on the affected area. If the voltage fluctuation exceeds the second voltage threshold (e.g., below 209V or above 231V), and the current intensity increases significantly, approaching or even exceeding the maximum rated value (e.g., exceeding 400A), a major change in the network topology is detected, which may lead to a large-scale power outage risk. In this case, the control strategy is to take emergency isolation measures, immediately cut off the power supply to the faulty section to prevent the accident from escalating, and trigger topology reconfiguration to attempt to restore power supply.

[0125] Specifically, when performing isolation operations, the fault handling module analyzes the fault level of the faulty area to obtain a first fault level and a second fault level. At the first fault level, the corresponding terminal is controlled to automatically cut off the power supply to the faulty segment and send an isolation report to the master station. The first fault level refers to a relatively minor fault that can be resolved by simple measures such as cutting off the power supply. At the second fault level, the faulty device is marked as unavailable, triggering a topology reconfiguration command to update the adaptive network topology. The second fault level refers to a more serious fault that requires more complex measures, such as reconfiguring the network topology to bypass the fault point.

[0126] After the isolation operation is completed, the fault handling module performs the fault recovery operation and obtains the fault recovery operation feedback information; based on the fault recovery operation feedback information, it determines whether to trigger the manual access process.

[0127] Furthermore, the communication module sets communication priorities based on terminals at different levels; when updating the adaptive network topology, the adaptive update unit prioritizes an incremental update strategy in the first working mode, which only updates the changed parts to minimize interference and resource consumption on the system; in the second working mode, a full reconfiguration strategy is enabled. The second working mode is suitable for situations where the power grid experiences anomalies or requires significant adjustments, and it places greater emphasis on flexibility and response speed; the full reconfiguration strategy completely rebuilds the network topology, making it suitable for handling complex change requirements.

[0128] It should be understood that the sequence number of each step in the above embodiments does not imply the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of this application.

[0129] Each module in the aforementioned distribution network feeder terminal with adaptive network topology can be implemented entirely or partially through software, hardware, or a combination thereof; each module can be embedded in the processor of a computer device in hardware form or independent of the processor, or it can be stored in the memory of a computer device in software form, so that the processor can call and execute the operations corresponding to each module.

[0130] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the above-described division of functional units and modules is used as an example. In practical applications, the above functions can be assigned to different functional units and modules as needed, that is, the internal structure of the device can be divided into different functional units or modules to complete all or part of the functions described above.

[0131] The above-described embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application, and should all be included within the protection scope of this application.

Claims

1. A control method for a distribution network feeder terminal with an adaptive network topology, characterized in that, An application to a distribution network feeder terminal with an adaptive network topology, wherein the distribution network feeder terminal with an adaptive network topology includes: The topology building module constructs an adaptive network topology based on the terminal device information within the target jurisdiction and connects to a dynamic update interface that supports dynamic updates. The communication module communicates with adjacent terminals based on a preset standardized protocol to achieve topology information exchange; The fault handling module performs fault location, isolation and recovery operations through current detection and interaction with adjacent terminal commands, and outputs the fault handling results. The adaptive update unit removes the corresponding faulty node and updates the adaptive network topology based on the fault handling result. The control method includes: Collect terminal device information within the target jurisdiction, construct an adaptive network topology, and implement the configuration of the adaptive network topology to support dynamic updates based on a dynamic update interface; Based on a pre-defined standardized protocol, it communicates with adjacent terminals to achieve topology information exchange; By detecting the current and interacting with commands from adjacent terminals, the system performs fault location, isolation, and recovery operations, and outputs the corresponding fault handling results. Based on the fault handling results, the corresponding faulty nodes are removed, and the adaptive network topology is updated in real time. The control method further includes: Obtain network operation data within the target jurisdiction and extract key performance indicators from the network operation data; Based on the operational data, the current network topology status is identified, and the current network topology status is matched with a preset standard network topology model to determine whether the working mode of the feeder terminal needs to be adjusted. The system has preset first and second working modes for different network topologies; the first working mode is selected when the network topology is identified as being in a standard state, and the second working mode is selected otherwise. The network operation data is analyzed according to the working mode to obtain different monitoring and analysis results; Execute corresponding control strategies based on different monitoring and analysis results.

2. The control method for a distribution network feeder terminal with an adaptive network topology according to claim 1, characterized in that, The topology construction module supports hierarchical queries, and the communication latency of hierarchical queries is within a preset latency threshold. The specific process includes: Send topology query commands to adjacent terminals to obtain the on / off status, local topology, and IP address of the upper-level and lower-level terminals; The information returned by terminals at each level is recursively combined to generate a complete network topology diagram.

3. The control method for a distribution network feeder terminal with an adaptive network topology according to claim 1, characterized in that, The fault location operation of the fault handling module includes: When the upper-level terminal detects a fault current, it sends a status query command to the lower-level terminal and obtains the current signal; If the lower-level terminal does not feed back a current signal, the fault range is determined to be the area between the upper-level terminal and the lower-level terminal. The isolation and recovery operations of the fault handling module include: The upstream terminal disconnects and isolates the faulty area, while the downstream terminal remains closed. After receiving the successful trip signal, the corresponding communication switch of the upper-level terminal closes the circuit breaker, restoring power supply to the non-faulty area.

4. The control method for a distribution network feeder terminal with an adaptive network topology according to claim 1, characterized in that, The dynamic update interface supports hot-swappable configuration; the terminal device information includes device identifier, device connection relationship and attributes; the preset standardized protocol includes the IEC61850 standard protocol.

5. The control method for a distribution network feeder terminal with an adaptive network topology according to claim 1, characterized in that, The key performance indicators include voltage level, current intensity, and power factor; the analysis of the network operation data according to the operating mode specifically includes: In the first operating mode, the voltage level is compared with a preset first voltage threshold, and the current intensity is compared with a preset first current threshold; When the voltage level or current intensity exceeds the corresponding threshold, a preset self-diagnostic program is activated and abnormal events are recorded to obtain the first monitoring and analysis results. In the second working mode, it monitors for changes in network topology and adds detection of dynamic parameters; The dynamic parameters are compared with preset second voltage thresholds and second current thresholds to obtain the second monitoring and analysis results.

6. The control method for a distribution network feeder terminal with an adaptive network topology according to claim 1, characterized in that, After identifying the current network topology state based on the operational data and matching the current network topology state with a preset standard network topology model, the process further includes: Based on the operational data, the corresponding power parameter values ​​are obtained, including voltage fluctuation value, current intensity change rate, and power factor stability rate. According to the threshold judgment rule in the preset control strategy, the voltage fluctuation is compared with the first voltage fluctuation threshold and the second voltage fluctuation threshold respectively, wherein the first voltage fluctuation threshold is less than the second voltage fluctuation threshold; When the voltage fluctuation value is less than the first voltage fluctuation threshold, the corresponding operating data is classified as normal operating data; when the voltage fluctuation value is greater than the second voltage fluctuation threshold, the current intensity change rate and the corresponding network topology information of the same feeder segment within a specified time period are obtained. When the network topology information corresponding to the same feeder segment is consistent, the corresponding operating data where the current intensity change rate of the same feeder segment exceeds the preset change rate threshold is classified as abnormal operating data. An error message is triggered based on the abnormal operation data.

7. The control method for a distribution network feeder terminal with an adaptive network topology according to claim 1, characterized in that, include: When performing isolation operations, the fault handling module analyzes the fault level of the fault area to obtain the first fault level and the second fault level. At the first fault level, the corresponding terminal is controlled to automatically cut off the power supply to the faulty segment and send an isolation report to the main station. At the second fault level, the faulty device is marked as unavailable, triggering a topology reconfiguration command to update the adaptive network topology. After the isolation operation is completed, the fault handling module performs a fault recovery operation and obtains fault recovery operation feedback information; Based on the feedback information from the fault recovery operation, determine whether to trigger the manual access process.

8. The control method for a distribution network feeder terminal with an adaptive network topology according to claim 5, characterized in that, The communication module sets communication priorities based on different levels of terminals; When updating the adaptive network topology, the adaptive update unit prioritizes an incremental update strategy in the first working mode and enables a full reconstruction strategy in the second working mode.

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