Distributed residual current protection method and system for low voltage power distribution

Abstract

The present invention discloses a distributed residual current protection method and system for low-voltage power distribution, which relates to the technical field related to power distribution management. The method includes: interactively obtaining the associated design information of the low-voltage distribution network; analyzing the structural characteristics of the topological network to obtain the distributed sensing layout strategy; laying out the residual current protector in the low-voltage distribution network to generate a residual current protection array; locating the monitoring nodes in the low-voltage distribution topological network to generate a scattered set of monitoring nodes; mapping and communicating the residual current protection array and multiple monitoring nodes to complete the construction of a residual current visualization model; performing residual current monitoring based on the residual current protection array and projecting it to the residual current visualization model; and outputting the residual current protection strategy. The method solves the technical problem that the existing low-voltage distribution cannot realize accurate detection and protection of residual current, which leads to low safety and poor reliability of the low-voltage distribution system.

Description

Technical Field

[0001] The present application relates to the field related to power distribution management technology, and specifically to a distributed residual current protection method and system for low-voltage power distribution. Background Art

[0002] With the development of power systems and the increase in electricity demand, safety and reliability have become important considerations in low-voltage distribution systems. Low-voltage distribution is a power system that distributes and supplies high-voltage electricity output from the power grid after it is reduced in voltage through transformers and other equipment. The residual current in the low-voltage distribution process may cause potential dangers of equipment damage or even fire. It is particularly important to introduce distributed residual current protection in low-voltage distribution systems. However, traditional residual current protection is usually concentrated in distribution boxes. For centralized protection of residual current, the current line is longer, and the signal attenuation and interference are more serious, resulting in incorrect judgment of the residual current protector. In addition, the centralized type cannot provide accurate protection for each line terminal, and it is difficult to quickly locate the fault point.

[0003] Therefore, in the current low-voltage power distribution residual current protection related technologies, there is a technical problem that the accurate detection and protection of residual current cannot be achieved, which leads to low safety and poor reliability of the low-voltage power distribution system. Summary of the invention

[0004] The present application provides a distributed residual current protection method and system for low-voltage power distribution, and adopts technical means such as building a topological network, deploying residual current protectors, building a visualization model, and outputting protection strategies to solve the technical problem that the existing low-voltage power distribution cannot accurately detect and protect the residual current, which leads to low safety and poor reliability of the low-voltage power distribution system. The application achieves the technical effect of accurately detecting and protecting the residual current, thereby improving the safety and reliability of the low-voltage power distribution system.

[0005] The present application provides a distributed residual current protection method for low-voltage power distribution, the method comprising: interactively obtaining associated design information of a low-voltage distribution network, and restoring a low-voltage distribution topology network according to the associated design information; performing structural feature analysis on the low-voltage distribution topology network to obtain a distributed sensor deployment strategy, wherein the distributed sensor deployment strategy includes multiple monitoring positioning points; deploying residual current protectors in the low-voltage distribution network with reference to the multiple monitoring positioning points of the distributed sensor deployment strategy to generate a residual current protection array, wherein the residual current protection array includes multiple key monitoring points; locating monitoring nodes in the low-voltage distribution topology network according to the residual current protection array to generate a scattered set of monitoring nodes including multiple monitoring nodes; constructing a mapping communication between the residual current protection array and the multiple monitoring nodes in the low-voltage distribution topology network to complete the construction of a residual current visualization model; performing residual current monitoring on the low-voltage distribution network based on the residual current protection array, and projecting the monitoring results to the residual current visualization model; and outputting a residual current protection strategy according to the residual current visualization model.

[0006] In a possible implementation, the associated design information of the low-voltage distribution network is obtained interactively, and the low-voltage distribution topology network is restored according to the associated design information, and the following processing is performed: a standard protection object set is pre-constructed, and the associated design information is traversed using the standard protection object set to obtain a plurality of low-voltage distribution protection scattered points; a plurality of current transmission path sets of the plurality of low-voltage distribution protection scattered points are obtained interactively using the associated design information; the plurality of low-voltage distribution protection scattered points are used as topological nodes, and the topological nodes are connected in a directional manner based on the plurality of current transmission path sets to generate the low-voltage distribution topology network.

[0007] In a possible implementation, a structural feature analysis is performed on the low-voltage power distribution topology network to obtain a distributed sensor deployment strategy, and the following processing is performed: branch loop positioning is performed on the low-voltage power distribution topology network, and the low-voltage power distribution topology network is split based on the branch loop positioning result to obtain multiple local power distribution topology networks; a sensor deployment analyzer is constructed based on a preset algorithm, and the multiple local power distribution topology networks are input into the sensor deployment analyzer for structural feature analysis to obtain multiple local sensor deployment strategies; group label stripping is performed on the multiple local sensor deployment strategies to obtain the distributed sensor deployment strategy composed of the multiple monitoring positioning points.

[0008] In a possible implementation, a sensor deployment analyzer is generated based on a preset algorithm, and the following processing is also performed: the sensor deployment analyzer includes a fully connected node matching execution layer, a local similarity calculation layer, and an associated similarity calculation layer; multiple sample power distribution topology networks and multiple sample sensor deployment strategies are interactively obtained, and the multiple sample power distribution topology networks and multiple sample sensor deployment strategies are associated and stored based on a knowledge graph to obtain a sample strategy memory; the sample strategy memory is synchronized to the node matching execution layer and the associated similarity calculation layer to complete the construction of the sensor deployment analyzer.

[0009] In a possible implementation, the multiple local power distribution topology networks are input into the sensor layout analyzer for structural feature analysis to obtain multiple local sensor layout strategies, and the following processing is performed: randomly calling the first local power distribution topology network from the multiple local power distribution topology networks; in the node matching execution layer, topology node calling is performed on the first local power distribution topology network to obtain a first local node set, and the first local node set is used to traverse the multiple sample power distribution topology networks in the sample strategy memory for intersection node matching to obtain multiple node matching coefficients; a node matching threshold is preset, and the multiple node matching coefficients are compared based on the node matching threshold to obtain M sample power distribution topology networks that meet the node matching threshold, wherein M is a positive integer; in the local similarity calculation layer, node connection relationship calling is performed in the first local power distribution topology network based on the first local node set to obtain a first local connection relationship set, and the first local node set is used to compare the node matching coefficients. The domain connection relationship set traverses the M sample power distribution topology networks to obtain M connection matching coefficients; a connection matching threshold is preset, and the M connection matching coefficients are compared based on the connection matching threshold to obtain K sample power distribution topology networks that meet the connection matching threshold, wherein K is a positive integer less than M; in the associated similarity calculation layer, the branch loop is positioned as the node center, and the node distance of the first local node set is calculated in the first local power distribution topology network, and weights are assigned based on the calculation results to obtain a first local weight set; based on the first local weight set, weighted calculation and extreme value call are performed on the M sample power distribution topology networks to obtain associated similarity extreme values; according to the sample power distribution topology network corresponding to the associated similarity extreme value, the first local sensor layout strategy is called in the sample strategy memory; and by analogy, the multiple local power distribution topology networks are input into the sensor layout analyzer for structural feature analysis to obtain the multiple local sensor layout strategies.

[0010] In a possible implementation, residual current monitoring is performed on the low-voltage distribution network based on the residual current protection array, and the monitoring results are projected onto the residual current visualization model, and the following processing is also performed: based on the distributed sensor deployment strategy, a plurality of residual current monitoring objects corresponding to the plurality of key monitoring points in the residual current protection array are obtained; the plurality of residual current safety domains of the plurality of residual current monitoring objects are obtained by interacting with the low-voltage distribution network, and the plurality of residual current safety domains are synchronized to the residual current protection array as residual current monitoring constraint mappings; a plurality of residual current protectors pre-deployed at the plurality of key monitoring points compare the plurality of residual current safety domains with the real-time residual current in real time, and when the real-time residual current exceeds the corresponding residual current safety domain, the monitoring result is output, wherein the monitoring result is the real-time residual current.

[0011] In a possible implementation, a residual current protection strategy is output according to the residual current visualization model, and the following processing is also performed: when the monitoring result includes multiple real-time residual currents, the monitoring nodes corresponding to the multiple real-time residual currents are located in the residual current visualization model to obtain multiple monitoring nodes to be protected; the connection trajectories of the multiple monitoring nodes to be protected are fitted in the residual current visualization model to obtain the shortest operation and maintenance path, and the shortest operation and maintenance path is output as the residual current protection strategy.

[0012] The present application also provides a distributed residual current protection system for low voltage power distribution, comprising:

[0013] A low-voltage distribution topology network acquisition and analysis module, the low-voltage distribution topology network acquisition and analysis module is used to interactively obtain the associated design information of the low-voltage distribution network, and restore the low-voltage distribution topology network according to the associated design information, perform structural feature analysis on the low-voltage distribution topology network, and obtain a distributed sensing deployment strategy, wherein the distributed sensing deployment strategy includes multiple monitoring positioning points;

[0014] A residual current protector deployment module, the residual current protector deployment module is used to deploy residual current protectors in the low-voltage distribution network with reference to the multiple monitoring positioning points of the distributed sensing deployment strategy, and generate a residual current protection array, wherein the residual current protection array includes multiple key monitoring points;

[0015] A topology network monitoring node positioning module, the topology network monitoring node positioning module is used to locate monitoring nodes in the low-voltage power distribution topology network according to the residual current protection array, and generate a monitoring node scattered point set including multiple monitoring nodes;

[0016] A residual current visualization model construction module, wherein the residual current visualization model construction module is used to construct a mapping communication between the residual current protection array and the plurality of monitoring nodes in the low-voltage power distribution topology network, and complete the construction of a residual current visualization model;

[0017] A residual current protection strategy output module, which is used to monitor the residual current of the low-voltage distribution network based on the residual current protection array, and project the monitoring results to the residual current visualization model, and output the residual current protection strategy according to the residual current visualization model.

[0018] It is intended to interactively obtain the associated design information of the low-voltage distribution network through the distributed residual current protection method and system proposed in this application, and restore the low-voltage distribution topology network according to the associated design information, perform structural feature analysis on the low-voltage distribution topology network, obtain a distributed sensor deployment strategy, deploy residual current protectors in the low-voltage distribution network with reference to the multiple monitoring positioning points of the distributed sensor deployment strategy, generate a residual current protection array, locate monitoring nodes in the low-voltage distribution topology network according to the residual current protection array, generate a monitoring node scatter set including multiple monitoring nodes, and in the low-voltage distribution topology network, generate a monitoring node scatter set including multiple monitoring nodes. The network constructs mapping communication between the residual current protection array and the multiple monitoring nodes, completes the construction of the residual current visualization model, monitors the residual current of the low-voltage distribution network based on the residual current protection array, and projects the monitoring results to the residual current visualization model, and outputs the residual current protection strategy according to the residual current visualization model, which solves the technical problem that the existing low-voltage distribution cannot accurately detect and protect the residual current, thereby causing the low-voltage distribution system to have low safety and poor reliability, and achieves the technical effect of accurately detecting and protecting the residual current, thereby improving the safety and reliability of the low-voltage distribution system. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solution of the embodiment of the present disclosure, the accompanying drawings of the embodiment of the present disclosure will be briefly introduced below. A flow chart is used in the present application to illustrate the operations performed by the system according to the embodiment of the present application. It should be understood that the preceding or following operations are not necessarily performed accurately in order. On the contrary, various steps can be processed in reverse order or simultaneously as needed. At the same time, other operations can also be added to these processes, or one or more operations can be removed from these processes.

[0020] Figure 1 A schematic flow chart of a distributed residual current protection method for low-voltage power distribution provided in an embodiment of the present application;

[0021] Figure 2A schematic diagram of the structure of a distributed residual current protection system for low-voltage power distribution provided in an embodiment of the present application. DETAILED DESCRIPTION

[0022] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below.

[0023] In order to make the purpose, technical solutions and advantages of the present application clearer, the present application will be further described in detail below in conjunction with the accompanying drawings. The described embodiments should not be regarded as limiting the present application. All other embodiments obtained by ordinary technicians in the field without making creative work are within the scope of protection of this application.

[0024] In the following description, reference is made to "some embodiments", which describe a subset of all possible embodiments, but it is understood that "some embodiments" may be the same subset or different subsets of all possible embodiments, and may be combined with each other without conflict, and the terms "first\second" involved are merely to distinguish similar objects and do not represent a specific ordering of objects. The terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product, or server that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or modules that are not clearly listed or inherent to these processes, methods, products, or devices. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those generally understood by technicians in the technical field of this application. The terms used herein are for the purpose of describing the embodiments of the present application only.

[0025] The present application embodiment provides a distributed residual current protection method for low voltage power distribution, such as Figure 1 As shown, the method includes:

[0026] Low-voltage power distribution refers to the process in which the high voltage transmitted by the power grid is converted into a low voltage (usually 220V or 380V) through transformers and other equipment, and distributed and supplied to end users. Industrial, commercial and residential power systems all require low-voltage power distribution. In low-voltage power distribution systems, in order to maintain the safety of personnel and equipment, protection is usually achieved by installing overload protectors, short-circuit protectors, grounding protection devices, etc. Residual current refers to the current that passes through the circuit and does not return to the power supply through the normal loop. Under normal circumstances, the current should form a closed loop in the circuit, from the power supply to the load, and then from the load back to the power supply. When a ground fault or other type of leakage fault occurs, part of the current may flow to the ground or other abnormal paths, resulting in failure to fully return to the power supply. This part of the current that does not return to the power supply is the residual current.

[0027] Step S100, interactively obtain the associated design information of the low-voltage distribution network, and restore the low-voltage distribution topology network according to the associated design information. Among them, the associated information of the low-voltage distribution network refers to the interconnection relationship and topology structure between various electrical equipment (such as step-down transformers, distribution boxes, switchgear, terminal power equipment, etc.) in the low-voltage distribution system, including the connection mode between each device, the layout of the line, the wiring rules, the current flow direction and other information and circuit diagrams, and restore the low-voltage distribution topology network based on the associated design information in the low-voltage distribution network, that is, simulate the connection relationship and structure between each device in the low-voltage distribution system to obtain the low-voltage distribution topology structure, so as to perform subsequent fault detection and maintenance to ensure the stability of the power system.

[0028] In a possible implementation, step S100 further includes step S110, pre-constructing a standard protection object set, and using the standard protection object set to traverse the associated design information to obtain multiple low-voltage distribution protection scattered points. Specifically, the standard protection object set refers to objects that theoretically require residual current detection to protect the equipment, and there is a deviation from the actual layout of residual current monitoring equipment, including various equipment in the low-voltage distribution system, such as transformers, distribution boxes, switches, cables, etc., and circuit protection devices associated with these equipment, etc., matching and comparing each protection object in the pre-constructed standard protection object set with the associated design information, identifying the protection requirements and configuration conditions in the low-voltage distribution system, and the low-voltage distribution protection scattered points refer to multiple locations that require residual current protection based on the above matching and comparison results, where the location points may be transformers, distribution boxes, interfaces of low-voltage cables, circuit breakers of switchgear, power inputs of terminal devices, etc. It also includes step S120, interacting with the associated design information to obtain multiple current transmission path sets of the multiple low-voltage distribution protection scattered points. The obtained low-voltage distribution protection scattered points and the associated design information are interacted to determine the multiple current transmission paths of the multiple low-voltage distribution protection scattered points. Specifically, the connection mode between each power equipment and the related information such as the protection device are analyzed to obtain multiple current transmission path sets, wherein each current transmission path is a current transmission path from the power supply to one or more protection scattered points. The current transmission path can be better analyzed and evaluated in the low-voltage distribution system, and the load condition of the circuit and the accurate position of the protection device are determined. It also includes step S130, taking the multiple low-voltage distribution protection scattered points as topological nodes, and making a directional connection of the topological nodes based on the multiple current transmission path sets to generate the low-voltage distribution topological network. Specifically, the obtained multiple low-voltage distribution protection scattered points are taken as topological nodes, and according to the information in the multiple current transmission path sets, the topological nodes are connected in a directional manner along the path direction of the current transmission to generate a low-voltage distribution topological network, which clearly reflects the path and direction of the current in the entire system.

[0029] After obtaining the low-voltage power distribution topology network, execute step S200, analyze the structural characteristics of the low-voltage power distribution topology network, and obtain a distributed sensing deployment strategy, wherein the distributed sensing deployment strategy includes multiple monitoring positioning points. By analyzing the structure and connection relationship of the low-voltage power distribution topology network, the number, location distribution, connection mode, and connectivity of the network nodes of the topological network structure are determined. The distributed sensing deployment strategy refers to a strategy for deploying sensors in network nodes in a distributed manner according to the structural characteristics of the low-voltage power distribution topology network, wherein the distributed sensing deployment strategy includes determining multiple monitoring positioning points of the load current, and these network nodes detect current through deployed sensors to achieve accurate monitoring of the low-voltage power distribution system.

[0030] In a possible implementation, step S200 performs structural feature analysis on the low-voltage power distribution topology network to obtain a distributed sensing deployment strategy, and also includes step S210, performing branch loop positioning on the low-voltage power distribution topology network, and performing splitting processing on the low-voltage power distribution topology network based on the branch loop positioning result to obtain multiple local power distribution topology networks. Wherein, branch loop positioning refers to identifying branch loops in the power grid according to the connection relationship and current transmission path and direction of the low-voltage power distribution network. A branch loop refers to a current transmission path that starts from a node, passes through a series of connections, and returns to the original node. Splitting processing refers to splitting the low-voltage power distribution topology network into multiple local power distribution topology networks according to the results of branch loop positioning. Each local power distribution topology network contains one or more branch loops. Specifically, based on the results of branch loop positioning, the low-voltage power distribution topology network can be split to obtain multiple local power distribution topology networks. Each local power distribution topology network represents an independent part or loop in the system, with its own power supply source and connection equipment. It also includes step S220, constructing and generating a sensor deployment analyzer based on a preset algorithm, inputting the multiple local power distribution topology networks into the sensor deployment analyzer for structural feature analysis, and obtaining multiple local sensor deployment strategies. The sensor deployment analyzer is generated using the existing topology analysis algorithm and sensor deployment strategy. The sensor deployment analyzer can perform structural feature analysis based on the input local power distribution topology network and generate corresponding local sensor deployment strategies. Specifically, the sensor deployment analyzer performs structural feature analysis on each input local power distribution topology network, including analyzing the distribution of each node, the length of the transmission path, etc. Based on the structural analysis results, multiple local sensor deployment strategies are generated to reduce the amount of data detection and processing, and achieve accurate monitoring of the local power distribution topology network. It also includes step S230, performing group label stripping on the multiple local sensor deployment strategies to obtain the distributed sensor deployment strategy composed of the multiple monitoring positioning points. The grouping label is stripped from each local sensor deployment strategy, that is, the identification of the classification and group is deleted in the local sensor deployment strategy, and the distributed sensor deployment strategy of the entire low-voltage distribution system composed of multiple monitoring positioning points is obtained.

[0031] In a possible implementation, step S220 generates a sensor deployment analyzer based on a preset algorithm, and also includes step S221, wherein the sensor deployment analyzer includes a fully connected node matching execution layer, a local similarity calculation layer, and an associated similarity calculation layer. Specifically, the fully connected node matching execution layer represents a module in the sensor deployment analyzer that processes and matches sensor nodes, which refers to connecting and matching all nodes, that is, each node is interconnected with all other nodes; the local similarity calculation layer represents a module in the sensor deployment analyzer that calculates the similarity of sensor nodes in a local area, and similarity refers to the degree of similarity between nodes in certain features. The function of the local similarity calculation layer is to calculate the similarity index between nodes based on the similarity of nodes in the local area; the associated similarity calculation layer represents a module in the sensor deployment analyzer that calculates the correlation between similar sensor nodes in a local area, for example, in an electric power system, the correlation of currents between nodes. It also includes step S222, interactively obtaining multiple sample power distribution topology networks and multiple sample sensor deployment strategies, and performing associative storage of the multiple sample power distribution topology networks and multiple sample sensor deployment strategies based on the knowledge graph to obtain a sample strategy memory. Interact with the user to obtain multiple sample power distribution topology networks and multiple sample sensor deployment strategies, build a knowledge graph, which includes nodes, attributes, deployment methods, locations, etc. of the power distribution topology network and sensor deployment strategy, and then combine multiple sample power distribution networks and multiple sample sensor deployment strategies for associative storage to obtain a sample strategy memory, and use the knowledge graph to facilitate efficient retrieval. It also includes step S223, synchronizing the sample strategy memory to the node matching execution layer and the associated similarity calculation layer to complete the construction of the sensor deployment analyzer.

[0032] In a possible implementation, step S220, inputting the multiple local power distribution topology networks into the sensor layout analyzer for structural feature analysis to obtain multiple local sensor layout strategies, further comprising step S224, randomly calling the first local power distribution topology network from the multiple local power distribution topology networks. It also comprises step S225, in the node matching execution layer, performing topological node calling on the first local power distribution topology network to obtain a first local node set, and using the first local node set to traverse the multiple sample power distribution topology networks in the sample strategy memory for intersection node matching to obtain multiple node matching coefficients. Performing topological node calling on the first local power distribution topology network, that is, calling the nodes of the first power distribution topology network to form a first local node set, performing intersection node matching on the obtained first local node set and the multiple sample power distribution topology networks in the sample strategy memory, calculating the matching degree of the intersection nodes, obtaining multiple node matching coefficients, and measuring the matching degree of the intersection nodes. The node matching coefficient can be expressed as the number of intersection nodes divided by the number of first local nodes. It also includes step S226, presetting a node matching threshold, and comparing the multiple node matching coefficients based on the node matching threshold to obtain M sample power distribution topology networks that meet the node matching threshold, where M is a positive integer. Presetting a node matching threshold for an intersection node, obtaining a node matching coefficient that meets the preset node matching threshold, that is, obtaining the corresponding M sample power distribution topology networks that meet the preset node matching threshold. It also includes step S227, in the local similarity calculation layer, based on the first local node set, performing a node connection relationship call in the first local power distribution topology network, obtaining a first local connection relationship set, and using the first local connection relationship set to traverse the M sample power distribution topology networks to obtain M connection matching coefficients. Call multiple connection relationships of the first local node set in the first local power distribution topology network, combine them into a first local connection relationship set, and then traverse the M sample power distribution topology networks based on the first local connection relationship set to obtain M connection matching coefficients, which represent the matching degree of the connection relationship in the M sample power distribution topology networks. The method further includes step S228, presetting a connection matching threshold, and comparing the M connection matching coefficients based on the connection matching threshold to obtain K sample power distribution topology networks that meet the connection matching threshold, wherein K is a positive integer less than M. Presetting a connection matching threshold, comparing the obtained M connection matching coefficients, and obtaining K sample power distribution topology networks that meet the connection matching threshold. The method further includes step S229, in the associated similarity calculation layer, locating the branch loop as the node center, performing node distance calculation of the first local node set in the first local power distribution topology network, and performing weight allocation based on the calculation result to obtain the first local weight set.Among them, the node distance calculation is to calculate the distance from the node center to other nodes, and different weights are assigned to other nodes based on the distance calculation results to obtain multiple weight assignment results, and form a first local weight set. It also includes weighted calculation and extreme value call of the M sample power distribution topology networks based on the first local weight set to obtain associated similar extreme values. Specifically, the M sample power distribution networks are weighted calculated using the acquired first weight set and the calculated extreme values ​​are called to obtain associated similar extreme values. It also includes calling the first local sensor layout strategy in the sample strategy memory according to the sample power distribution topology network corresponding to the associated similar extreme values. By analogy, the multiple local power distribution topology networks are input into the sensor layout analyzer for structural feature analysis to obtain the multiple local sensor layout strategies.

[0033] After obtaining the distributed sensing deployment strategy, execute step S300, deploy residual current protectors in the low-voltage distribution network with reference to the multiple monitoring positioning points of the distributed sensing deployment strategy, and generate a residual current protection array, wherein the residual current protection array includes multiple key monitoring points. Specifically. Based on the multiple monitoring positioning points of the obtained distributed sensing deployment strategy, residual current protectors are deployed in the low-voltage distribution network, and all deployed residual current protectors form a residual current protection array, which includes multiple key monitoring points, monitors the operating status of the low-voltage distribution network in real time, effectively protects the safe and stable operation of the low-voltage distribution network, and ensures electricity safety.

[0034] After the residual current protection array is generated, step S400 is executed to locate the monitoring nodes in the low-voltage distribution topology network according to the residual current protection array, and a monitoring node scatter set including multiple monitoring nodes is generated. The monitoring node scatter set includes information of each monitoring node of the low-voltage distribution network, such as the location coordinates of the monitoring node, the current monitoring value, the equipment status, etc. Specifically, the location coordinates of the monitoring node can determine the physical location of the node, which is convenient for operation and maintenance; the current monitoring value reflects the current distribution of the power grid, and can detect abnormalities in time. The monitoring node scatter set provides data support for the real-time monitoring and management of the power grid, and can detect and handle problems in time, thereby ensuring the safety and stable operation of the power grid.

[0035] After generating the scattered point set of monitoring nodes, execute step S500, construct the mapping communication between the residual current protection array and the multiple monitoring nodes in the low-voltage distribution topology network, and complete the construction of the residual current visualization model. Specifically, multiple monitoring nodes and residual current protectors are mapped and connected in communication. For example, by establishing a communication network, wired or wireless communication, the monitoring nodes are connected to the residual current protector, and based on the mapping communication between the connected residual current protection array and multiple monitoring nodes, a residual current visualization model is constructed to display the location of the monitoring nodes, current values, etc., to help users intuitively understand the operation of the low-voltage distribution network and ensure the safe and stable operation of the power grid.

[0036] Next, step S600 is executed to perform residual current monitoring on the low-voltage distribution network based on the residual current protection array, and the monitoring results are projected onto the residual current visualization model. Specifically, the residual current protection array performs residual current monitoring on the low-voltage distribution network, and any abnormal residual current conditions detected, such as ground faults or leakage conditions, are input into the current visualization model. The residual current visualization model is used to monitor the residual current conditions in the low-voltage distribution network in real time. If an abnormality is found, the model automatically generates an early warning and displays it on the visualization interface, so that the residual current monitoring results can be intuitively understood, thereby better ensuring the safe and stable operation of the power grid.

[0037] In a possible implementation, step S600 also includes step S610, which obtains multiple residual current monitoring objects corresponding to the multiple key monitoring points in the residual current protection array based on the distributed sensor deployment strategy call. Specifically, according to the mapping relationship in the previous step, multiple residual current monitoring objects corresponding to multiple key monitoring points are obtained from the residual current protection array. These residual current monitoring objects can be specific current sensors, protector modules and other devices. It also includes step S620, which interacts with the low-voltage distribution network to obtain multiple residual current safety domains of the multiple residual current monitoring objects, and synchronizes the multiple residual current safety domains to the residual current protection array as residual current monitoring constraint mappings. Among them, multiple residual current safety domains refer to current monitoring areas corresponding to multiple residual current monitoring objects, which are synchronized to the residual current protection array with the residual current safety domain as a constraint condition, and the configuration parameters of the residual current protection array are updated in real time to ensure that the residual current protection array operates within a safe range. It also includes step S630, in which multiple residual current protectors pre-deployed in the multiple key monitoring points compare the multiple residual current safety domains and the real-time residual current in real time, and when the real-time residual current exceeds the corresponding residual current safety domain, output the monitoring result, wherein the monitoring result is the real-time residual current.

[0038] Finally, step S700 is executed to output the residual current protection strategy according to the residual current visualization model. Specifically, the residual current data is analyzed and presented in the residual current visualization model, the residual current situation of each monitoring point is monitored, and a corresponding residual current protection strategy is formulated, such as setting the threshold for triggering the action of the protection device, setting the alarm condition or the corresponding protection measures, etc. The formulated residual current protection strategy is output to ensure the safety and stability of the low-voltage distribution network.

[0039] In the above, refer to Figure 1 The distributed residual current protection method for low voltage power distribution according to an embodiment of the present invention is described in detail. Figure 2 A distributed residual current protection system for low voltage power distribution according to an embodiment of the present invention is described.

[0040] The distributed residual current protection system for low-voltage power distribution according to the embodiment of the present invention is used to solve the technical problem that the existing low-voltage power distribution cannot accurately detect and protect the residual current, which leads to the low safety and poor reliability of the low-voltage power distribution system, and achieves the technical effect of accurately detecting and protecting the residual current, thereby improving the safety and reliability of the low-voltage power distribution system. The distributed residual current protection system for low-voltage power distribution includes: a low-voltage power distribution topology network acquisition and analysis module 10, a residual current protector layout module 20, a topology network monitoring node positioning module 30, a residual current visualization model construction module 40, and a residual current protection strategy output module 50.

[0041] A low-voltage distribution topology network acquisition and analysis module 10, wherein the low-voltage distribution topology network acquisition and analysis module 10 is used to interactively obtain associated design information of a low-voltage distribution network, and restore and obtain a low-voltage distribution topology network according to the associated design information, perform structural feature analysis on the low-voltage distribution topology network, and obtain a distributed sensing deployment strategy, wherein the distributed sensing deployment strategy includes multiple monitoring positioning points;

[0042] A residual current protector deployment module 20, the residual current protector deployment module 20 is used to deploy residual current protectors in the low-voltage distribution network with reference to the multiple monitoring positioning points of the distributed sensing deployment strategy, and generate a residual current protection array, wherein the residual current protection array includes multiple key monitoring points;

[0043] A topology network monitoring node positioning module 30, wherein the topology network monitoring node positioning module 30 is used to perform monitoring node positioning in the low-voltage power distribution topology network according to the residual current protection array, and generate a monitoring node scattered point set including a plurality of monitoring nodes;

[0044] A residual current visualization model construction module 40, wherein the residual current visualization model construction module 40 is used to construct a mapping communication between the residual current protection array and the plurality of monitoring nodes in the low-voltage power distribution topology network, and complete the construction of a residual current visualization model;

[0045] The residual current protection strategy output module 50 is used to perform residual current monitoring on the low-voltage distribution network based on the residual current protection array, and project the monitoring results to the residual current visualization model, and output the residual current protection strategy according to the residual current visualization model.

[0046] The specific configuration of the low-voltage distribution topology network acquisition and analysis module 10 will be described in detail below. As described above, the associated design information of the low-voltage distribution network is interactively obtained, and the low-voltage distribution topology network is restored based on the associated design information. The low-voltage distribution topology network acquisition and analysis module 10 may further include: pre-building a standard protection object set, and using the standard protection object set to traverse the associated design information to obtain a plurality of low-voltage distribution protection scattered points; interactively obtaining a plurality of current transmission path sets of the plurality of low-voltage distribution protection scattered points using the associated design information; using the plurality of low-voltage distribution protection scattered points as topological nodes, and performing directional connection of topological nodes based on the plurality of current transmission path sets to generate the low-voltage distribution topology network.

[0047] The specific configuration of the low-voltage power distribution topology network acquisition and analysis module 10 will be described in detail below. As described above, the structural characteristics of the low-voltage power distribution topology network are analyzed to obtain a distributed sensor deployment strategy. The low-voltage power distribution topology network acquisition and analysis module 10 further includes: performing branch loop positioning on the low-voltage power distribution topology network, and splitting the low-voltage power distribution topology network based on the branch loop positioning result to obtain multiple local power distribution topology networks; constructing a sensor deployment analyzer based on a preset algorithm, inputting the multiple local power distribution topology networks into the sensor deployment analyzer for structural characteristics analysis, and obtaining multiple local sensor deployment strategies; performing group label stripping on the multiple local sensor deployment strategies to obtain the distributed sensor deployment strategy composed of the multiple monitoring positioning points.

[0048] The specific configuration of the low-voltage power distribution topology network acquisition and analysis module 10 will be described in detail below. As described above, based on the preset algorithm, the sensor layout analyzer is constructed and generated to obtain the distributed sensor layout strategy. The low-voltage power distribution topology network acquisition and analysis module 10 may further include: the sensor layout analyzer includes a fully connected node matching execution layer, a local similarity calculation layer, and an associated similarity calculation layer; multiple sample power distribution topology networks and multiple sample sensor layout strategies are interactively obtained, and the multiple sample power distribution topology networks and multiple sample sensor layout strategies are associated and stored based on the knowledge graph to obtain a sample strategy memory; the sample strategy memory is synchronized to the node matching execution layer and the associated similarity calculation layer to complete the construction of the sensor layout analyzer.

[0049] The specific configuration of the low-voltage power distribution topology network acquisition and analysis module 10 will be described in detail below. As described above, the multiple local power distribution topology networks are input into the sensor layout analyzer for structural feature analysis to obtain multiple local sensor layout strategies. The low-voltage power distribution topology network acquisition and analysis module 10 further includes: randomly calling the first local power distribution topology network from the multiple local power distribution topology networks; in the node matching execution layer, performing a topological node call on the first local power distribution topology network to obtain a first local node set, and using the first local node set to traverse the multiple sample power distribution topology networks in the sample strategy memory for intersection node matching to obtain multiple node matching coefficients; presetting a node matching threshold, and comparing the multiple node matching coefficients based on the node matching threshold to obtain M sample power distribution topology networks that meet the node matching threshold, where M is a positive integer; in the local similarity calculation layer, performing a node connection relationship call on the first local power distribution topology network based on the first local node set to obtain a first local connection relationship set, and using The M sample power distribution topology networks are traversed with the first local connection relationship set to obtain M connection matching coefficients; a connection matching threshold is preset, and the M connection matching coefficients are compared based on the connection matching threshold to obtain K sample power distribution topology networks that meet the connection matching threshold, wherein K is a positive integer less than M; in the associated similarity calculation layer, the branch loop is positioned as the node center, the node distance calculation of the first local node set is performed in the first local power distribution topology network, and weight allocation is performed based on the calculation result to obtain a first local weight set; based on the first local weight set, weighted calculation and extreme value call are performed on the M sample power distribution topology networks to obtain associated similarity extreme values; the first local sensor layout strategy is obtained by calling the sample power distribution topology network corresponding to the associated similarity extreme value in the sample strategy memory; and by analogy, the multiple local power distribution topology networks are input into the sensor layout analyzer for structural feature analysis to obtain the multiple local sensor layout strategies.

[0050] The specific configuration of the residual current protection strategy output module 50 will be described in detail below. As described above, the residual current of the low-voltage distribution network is monitored based on the residual current protection array, and the monitoring results are projected onto the residual current visualization model. The residual current protection strategy output module 50 further includes: based on the distributed sensing layout strategy, the multiple residual current monitoring objects corresponding to the multiple key monitoring points in the residual current protection array are obtained; the multiple residual current safety domains of the multiple residual current monitoring objects are obtained by interacting with the low-voltage distribution network, and the multiple residual current safety domains are synchronized to the residual current protection array as residual current monitoring constraint mappings; the multiple residual current protectors pre-deployed at the multiple key monitoring points compare the multiple residual current safety domains with the real-time residual current in real time, and when the real-time residual current exceeds the corresponding residual current safety domain, the monitoring result is output, wherein the monitoring result is the real-time residual current.

[0051] The specific configuration of the residual current protection strategy output module 50 will be described in detail below. As described above, the residual current protection strategy is output according to the residual current visualization model, and the residual current protection strategy output module 50 may further include: when the monitoring result includes multiple real-time residual currents, the monitoring nodes corresponding to the multiple real-time residual currents are located in the residual current visualization model to obtain multiple monitoring nodes to be protected; the connection trajectory of the multiple monitoring nodes to be protected is fitted in the residual current visualization model to obtain the shortest operation and maintenance path, and the shortest operation and maintenance path is used as the residual current protection strategy output.

[0052] The distributed residual current protection system for low-voltage power distribution provided by the embodiment of the present invention can execute the distributed residual current protection method for low-voltage power distribution provided by any embodiment of the present invention, and has the corresponding functional modules and beneficial effects of the execution method.

[0053] Although the present application makes various references to certain modules in the system according to the embodiments of the present application, any number of different modules may be used and run on the user terminal and / or server, and the various units and modules included are only divided according to functional logic, but are not limited to the above division, as long as the corresponding functions can be achieved; in addition, the specific names of the functional units are only for the convenience of distinguishing each other, and are not used to limit the scope of protection of the present invention.

[0054] The above specific implementations do not constitute a limitation on the protection scope of this application. It should be understood by those skilled in the art that various modifications, combinations and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions and improvements made within the spirit and principles of this application should be included in the protection scope of this application.

Claims

1. A distributed residual current protection method for low voltage power distribution, characterized in that: The method comprises: Interactively obtain associated design information of the low-voltage distribution network, and restore the low-voltage distribution topology network according to the associated design information; Analyzing the structural characteristics of the low-voltage power distribution topology network to obtain a distributed sensing deployment strategy, wherein the distributed sensing deployment strategy includes a plurality of monitoring positioning points; Deploy residual current protectors in the low-voltage distribution network with reference to the multiple monitoring positioning points of the distributed sensing deployment strategy to generate a residual current protection array, wherein the residual current protection array includes multiple key monitoring points; Positioning monitoring nodes in the low-voltage power distribution topology network according to the residual current protection array, generating a monitoring node scattered point set including a plurality of monitoring nodes; Constructing mapping communication between the residual current protection array and the plurality of monitoring nodes in the low-voltage power distribution topology network to complete the construction of a residual current visualization model; Performing residual current monitoring on the low-voltage distribution network based on the residual current protection array, and projecting the monitoring result to the residual current visualization model; Outputting a residual current protection strategy according to the residual current visualization model; The structural characteristics of the low-voltage power distribution topology network are analyzed to obtain a distributed sensing deployment strategy, including: Performing branch loop positioning on the low-voltage power distribution topology network, and performing splitting processing on the low-voltage power distribution topology network based on the branch loop positioning result to obtain multiple local power distribution topology networks; A sensor layout analyzer is constructed based on a preset algorithm, and the multiple local power distribution topology networks are input into the sensor layout analyzer for structural feature analysis to obtain multiple local sensor layout strategies; Stripping group labels from the multiple local sensor deployment strategies to obtain the distributed sensor deployment strategy consisting of the multiple monitoring positioning points; Generate a sensor deployment analyzer based on preset algorithms, including: The sensor layout analyzer includes a fully connected node matching execution layer, a local similarity calculation layer, and an associated similarity calculation layer; Interactively obtain multiple sample power distribution topology networks and multiple sample sensor deployment strategies, and associate and store the multiple sample power distribution topology networks and multiple sample sensor deployment strategies based on the knowledge graph to obtain a sample strategy storage; Synchronize the sample strategy memory to the node matching execution layer and the associated similarity calculation layer to complete the construction of the sensor deployment analyzer; The multiple local power distribution topology networks are input into the sensor layout analyzer for structural feature analysis to obtain multiple local sensor layout strategies, including: Randomly call and obtain a first local area power distribution topology network from the multiple local area power distribution topology networks; In the node matching execution layer, a topology node call is performed on the first local power distribution topology network to obtain a first local node set, and the first local node set is used to traverse multiple sample power distribution topology networks in the sample strategy memory to perform intersection node matching to obtain multiple node matching coefficients; Preset a node matching threshold, and compare the multiple node matching coefficients based on the node matching threshold to obtain M sample power distribution topology networks that meet the node matching threshold, where M is a positive integer; In the local similarity calculation layer, a node connection relationship call is performed in the first local power distribution topology network based on the first local node set to obtain a first local connection relationship set, and the first local connection relationship set is used to traverse the M sample power distribution topology networks to obtain M connection matching coefficients; Preset a connection matching threshold, and compare the M connection matching coefficients based on the connection matching threshold to obtain K sample power distribution topology networks that meet the connection matching threshold, where K is a positive integer less than M; In the associated similarity calculation layer, the branch loop is positioned as the node center, the node distance calculation of the first local node set is performed in the first local power distribution topology network, and the weight allocation is performed based on the calculation result to obtain the first local weight set; Based on the first local weight set, weighted calculation and extreme value calling are performed on the M sample power distribution topology networks to obtain associated similar extreme values; The first local sensor deployment strategy is obtained by calling the sample strategy memory according to the sample power distribution topology network corresponding to the associated similarity extreme value; By analogy, the multiple local power distribution topology networks are input into the sensor layout analyzer for structural feature analysis to obtain the multiple local sensor layout strategies.

2. The distributed residual current protection method for low voltage power distribution according to claim 1, characterized in that: Interactively obtaining associated design information of the low-voltage distribution network, and restoring the low-voltage distribution topology network according to the associated design information, the method further includes: Pre-constructing a standard protection object set, and using the standard protection object set to traverse the associated design information to obtain a plurality of low-voltage distribution protection scattered points; Interacting the associated design information to obtain multiple current transmission path sets of the multiple low-voltage power distribution protection scattered points; The multiple low-voltage power distribution protection scattered points are used as topological nodes, and the topological nodes are connected in a directional manner based on the multiple current transmission path sets to generate the low-voltage power distribution topological network.

3. The distributed residual current protection method for low voltage power distribution according to claim 1, characterized in that: The residual current of the low-voltage distribution network is monitored based on the residual current protection array, and the monitoring result is projected onto the residual current visualization model, and the method further includes: Based on the distributed sensor deployment strategy, a plurality of residual current monitoring objects corresponding to the plurality of key monitoring points in the residual current protection array are obtained; Interacting the low-voltage distribution network to obtain multiple residual current safety domains of the multiple residual current monitoring objects, and synchronizing the multiple residual current safety domains as residual current monitoring constraint mappings to the residual current protection array; The multiple residual current protectors pre-deployed in the multiple key monitoring points compare the multiple residual current safety domains with the real-time residual current in real time, and output the monitoring result when the real-time residual current exceeds the corresponding residual current safety domain, wherein the monitoring result is the real-time residual current.

4. The distributed residual current protection method for low voltage power distribution according to claim 1, characterized in that: Outputting a residual current protection strategy according to the residual current visualization model, the method further includes: When the monitoring result includes multiple real-time residual currents, the monitoring nodes corresponding to the multiple real-time residual currents are located in the residual current visualization model to obtain multiple monitoring nodes to be protected; The connection trajectories of the plurality of monitoring nodes to be protected are fitted in the residual current visualization model to obtain the shortest operation and maintenance path, and the shortest operation and maintenance path is output as the residual current protection strategy.

5. A distributed residual current protection system for low voltage power distribution, characterized in that: The system is used to implement the distributed residual current protection method for low-voltage power distribution according to any one of claims 1 to 4, and the system includes: A low-voltage distribution topology network acquisition and analysis module, the low-voltage distribution topology network acquisition and analysis module is used to interactively obtain the associated design information of the low-voltage distribution network, and restore the low-voltage distribution topology network according to the associated design information, perform structural feature analysis on the low-voltage distribution topology network, and obtain a distributed sensing deployment strategy, wherein the distributed sensing deployment strategy includes multiple monitoring positioning points; A residual current protector deployment module, the residual current protector deployment module is used to deploy residual current protectors in the low-voltage distribution network with reference to the multiple monitoring positioning points of the distributed sensing deployment strategy, and generate a residual current protection array, wherein the residual current protection array includes multiple key monitoring points; A topology network monitoring node positioning module, the topology network monitoring node positioning module is used to locate monitoring nodes in the low-voltage power distribution topology network according to the residual current protection array, and generate a monitoring node scattered point set including multiple monitoring nodes; A residual current visualization model construction module, wherein the residual current visualization model construction module is used to construct a mapping communication between the residual current protection array and the plurality of monitoring nodes in the low-voltage power distribution topology network, and complete the construction of a residual current visualization model; A residual current protection strategy output module, which is used to monitor the residual current of the low-voltage distribution network based on the residual current protection array, and project the monitoring results to the residual current visualization model, and output the residual current protection strategy according to the residual current visualization model.

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