Distribution network breaker configuration method and system applicable to new power systems

Abstract

The present invention discloses a method and system for configuring distribution network circuit breakers applicable to a new power system. The method includes obtaining topological data, fault data, and assembly position data of the circuit breakers in the distribution network; constructing a distribution network circuit breaker configuration model with the goal of minimizing the load loss of the distribution network through the fault data; respectively constructing a first virtual network and a second virtual network of the distribution network according to the topological data and the fault data; the first virtual network is used to simulate the fault current path, and the second virtual network is used to simulate the fault state transfer path; based on the first virtual network and the second virtual network, solve the distribution network circuit breaker configuration model through the assembly position data to obtain a circuit breaker configuration scheme for controlling the execution of the distribution network; by constructing models and virtual networks to cope with the dynamic changes of the distribution network topology, realize the intelligent configuration of the distribution network circuit breakers.

Description

Technical Field

[0001] The present invention relates to the field of power system automation and optimization, and particularly to a method and system for configuring distribution network circuit breakers applicable to a new power system. Background Art

[0002] In the face of the large-scale access of a large number of distributed power sources, controllable loads, energy storage, etc. to the distribution network, the stability of the distribution network faces unprecedented challenges. In response to this phenomenon, switch configuration is usually adopted to cope with the topological change process of the complex distribution network.

[0003] Existing circuit breaker configuration methods are usually formed according to the received manual control signals. However, manual control signals rely on human subjective experience, and both the response speed and accuracy are limited, and rapid isolation cannot be achieved during a fault, thereby affecting the power supply restoration of the distribution network.

[0004] Therefore, how to improve the response ability of circuit breakers to faults has become an urgent technical problem to be solved by those skilled in the art. Summary of the Invention

[0005] The present invention provides a method and system for configuring distribution network circuit breakers applicable to a new power system, and solves the problem of how to improve the response ability of circuit breakers to faults.

[0006] To solve the above technical problems, the first aspect of the present invention provides a method for configuring distribution network circuit breakers applicable to a new power system, including:

[0007] Obtaining the topological data, fault data of the distribution network, and the assembly position data of the circuit breakers in the distribution network;

[0008] Based on the fault data, with the goal of minimizing the load loss of the distribution network, constructing a distribution network circuit breaker configuration model;

[0009] Respectively constructing a first virtual network and a second virtual network of the distribution network according to the topological data and the fault data; the first virtual network is used to simulate the fault current path, and the second virtual network is used to simulate the fault state transfer path;

[0010] Based on the first virtual network and the second virtual network, solving the distribution network circuit breaker configuration model through the assembly position data to obtain a circuit breaker configuration scheme for controlling the distribution network to execute.

[0011] As a preferred solution, the fault data includes the preset fault scenarios of each line in the distribution network; the assembly position data includes the substation outlet positions in the distribution network and the head and end positions of each line in the distribution network.

[0012] As one of the preferred solutions, the preset fault scenarios include historical fault scenarios and simulation fault scenarios; among them, obtaining the fault data of the distribution network includes:

[0013] Obtaining the first fault data corresponding to the historical fault scenario and running the simulation fault scenario to obtain the second fault data corresponding to the simulation fault scenario;

[0014] Integrating the first fault data and the second fault data to obtain the fault data of the distribution network.

[0015] As one of the preferred solutions, constructing the first virtual network and the second virtual network of the distribution network according to the topology data and the fault data respectively includes:

[0016] Based on the topology data, taking the power source point in the distribution network as the injection starting point and transmitting it along the closed line, and taking the fault point in the fault data as the absorption end point to construct the first virtual network;

[0017] Based on the topology data, taking the fault point in the fault data as the injection starting point and transmitting it along the closed line, and taking the circuit breaker closest to the corresponding fault point as the absorption end point to construct the second virtual network.

[0018] As one of the preferred solutions, based on the first virtual network and the second virtual network, solving the circuit breaker configuration model of the distribution network through the assembly position data to obtain a circuit breaker configuration plan to control the execution of the distribution network includes:

[0019] Constructing a first constraint condition and a second constraint condition according to the first virtual network and the second virtual network respectively;

[0020] Constructing the connection relationship constraint between faults, lines and nodes in the distribution network through the fault data, the first virtual network and the second virtual network, and based on the assembly position data, determining the segmentation position relationship between the fault area and the non-fault area in the distribution network according to the connection relationship constraint;

[0021] Under the first constraint condition, the second constraint condition and the connection relationship constraint, solving the circuit breaker configuration model of the distribution network based on the segmentation position relationship to obtain a circuit breaker configuration plan to control the execution of the distribution network.

[0022] As one of the preferred solutions, the first constraint condition includes a first virtual flow injection constraint, a first virtual flow absorption constraint and a first virtual flow transmission constraint; among them,

[0023] The first virtual flow injection constraint is expressed by the following formula:

[0024]

[0025] Wherein, is 0 or 1, when it represents that node i is a power source point, when it represents that node i is not a power source point; and are respectively the virtual currents flowing through the i - side and j - side of line ij in the first virtual network; π(j) is the set of parent nodes of node j; o(i) is the set of child nodes of node i; N is the set of nodes in the distribution network; K is the set of fault points in the distribution network;

[0026] The first virtual flow absorption constraint is represented by the following formula:

[0027]

[0028] Wherein, is 0 or 1, when it represents that there is a fault point k on line ij, when it represents that there is no fault point k on line ij; E is the set of lines in the distribution network;

[0029] The first virtual flow transfer constraint is represented by the following formula:

[0030]

[0031]

[0032] Wherein, is 0 or 1, when it represents that the i - side of line ij in the first virtual network is in a closed state, when it represents that the i - side of line ij in the first virtual network is in an open state; is 0 or 1, when it represents that the j - side of line ij in the first virtual network is in a closed state, when it represents that the j - side of line ij in the first virtual network is in an open state; M is a parameter.

[0033] As one of the preferred solutions, the second constraint condition includes a second virtual flow injection constraint, a second virtual flow absorption constraint, and a second virtual flow transfer constraint; wherein,

[0034] The second virtual flow injection constraint is represented by the following formula:

[0035]

[0036] Wherein, and are the virtual currents flowing through the i - side and j - side of line ij in the second virtual network respectively;

[0037] The second virtual flow absorption constraint is expressed by the following formula:

[0038]

[0039]

[0040] In the formula, is 0 or 1. When it means that a circuit breaker is configured at the head end of line ij; when it means that no circuit breaker is configured at the head end of line ij; is 0 or 1. When it means that a circuit breaker is configured at the end of line ij; when it means that no circuit breaker is configured at the end of line ij; is 0 or 1. When it means that in the first virtual network, for the k - th fault point, a short - circuit current flows through the i - side of line ij; when it means that in the first virtual network, for the k - th fault point, no short - circuit current flows through the i - side of line ij; is 0 or 1. When it means that in the first virtual network, for the k - th fault point, a short - circuit current flows through the j - side of line ij; when it means that in the first virtual network, for the k - th fault point, no short - circuit current flows through the j - side of line ij; and are the first auxiliary variable and the second auxiliary variable respectively;

[0041] The second virtual flow transfer constraint is expressed by the following formula:

[0042]

[0043]

[0044] In the formula, is 0 or 1. When it means that the i - side of line ij in the second virtual network is in a closed state; when it means that the i - side of line ij in the first virtual network is in an open state; is 0 or 1. When it means that the j - side of line ij in the second virtual network is in a closed state; when it means that the j - side of line ij in the first virtual network is in an open state.

[0045] As one of the preferred solutions, the connection relationship constraint is expressed by the following formula:

[0046]

[0047]

[0048]

[0049]

[0050]

[0051] wherein, is 0 or 1, when it is, it means that line ij is connected to fault point k, when it is, it means that line ij is not connected to fault point k; is 0 or 1, when it is, it means that node i is connected to fault point k, when it is, it means that node i is not connected to fault point k;

[0052] The split position relationship is represented by the following formula:

[0053]

[0054]

[0055] wherein, is 0 or 1, when it is, it means that the i-side of line ij is the fault split position, when it is, it means that the i-side of line ij is not the fault split position; is 0 or 1, when it is, it means that the j-side of line ij is the fault split position, when it is, it means that the j-side of line ij is not the fault split position.

[0056] As one of the preferred solutions, after obtaining the breaker configuration solution to control the distribution network by solving the distribution network breaker configuration model based on the first virtual network and the second virtual network through the assembly position data, it includes:

[0057] Obtain the topology update data of the distribution network and the assembly position update data of the breaker after executing the breaker configuration solution;

[0058] Based on the topology update data, construct a distribution network restoration model with the goal of the shortest duration required for the distribution network to resume operation;

[0059] Update data according to the installation location, solve the distribution network restoration model through a preset optimization algorithm, and obtain a circuit breaker configuration update plan to control the execution of the distribution network.

[0060] The second aspect of the present invention provides a distribution network circuit breaker configuration system applicable to a new type of power system, including:

[0061] A data acquisition module for acquiring the topological data, fault data, and installation location data of the circuit breakers in the distribution network;

[0062] A model construction module for constructing a distribution network circuit breaker configuration model with the minimum load loss of the distribution network as the goal through the fault data;

[0063] A network construction module for respectively constructing a first virtual network and a second virtual network of the distribution network according to the topological data and the fault data; the first virtual network is used to simulate the fault current path, and the second virtual network is used to simulate the fault state transfer path;

[0064] A model solving module for solving the distribution network circuit breaker configuration model based on the first virtual network and the second virtual network through the installation location data, and obtaining a circuit breaker configuration plan to control the execution of the distribution network.

[0065] Compared with the prior art, the beneficial effects of the embodiments of the present invention are at least one of the following:

[0066] (1) The method includes acquiring the topological data, fault data, and installation location data of the circuit breakers in the distribution network, enabling the present invention to make decisions based on the actual operation data situation and physical topological layout, improving the pertinence and practicability of the configuration plan, adapting to the characteristics of different distribution networks and the changes in their topological structures, and enhancing flexibility and adaptability;

[0067] (2) The introduction of the virtual network makes the analysis and optimization process more intuitive and efficient, reducing the cost and risk of actual testing. The present invention constructs a model and a virtual network to cope with the dynamic changes of the distribution network topology, realizing effective and accurate intelligent configuration of the distribution network circuit breakers. Description of the Drawings

[0068] In order to more clearly illustrate the technical solutions of the present invention, the drawings required for implementation will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0069] Figure 1It is a flowchart of a method for configuring a distribution network circuit breaker applicable to a new power system provided by an embodiment of the present invention;

[0070] Figure 2 It is a flowchart of step S3 provided by an embodiment of the present invention;

[0071] Figure 3 It is a schematic diagram of a first virtual network provided by an embodiment of the present invention;

[0072] Figure 4 It is a schematic diagram of a second virtual network provided by an embodiment of the present invention;

[0073] Figure 5 It is a flowchart of step S4 provided by an embodiment of the present invention;

[0074] Figure 6 It is a flowchart of a method for configuring a distribution network circuit breaker applicable to a new power system provided by another embodiment of the present invention;

[0075] Figure 7 It is a structure diagram of an IEEE 33-node distribution system provided by an embodiment of the present invention;

[0076] Figure 8 It is a schematic diagram of the circuit breaker configuration result provided by an embodiment of the present invention;

[0077] Figure 9 It is a structure diagram of a distribution network circuit breaker configuration system applicable to a new power system provided by an embodiment of the present invention. Detailed implementation manners

[0078] Next, in combination with the accompanying drawings and embodiments, the technical solutions in the embodiments of the present invention will be clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. The purpose of providing these embodiments is to make the disclosure of the present invention more thorough and comprehensive. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0079] In the description of this application, the terms "first", "second", "third", etc. are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first", "second", "third", etc. may explicitly or implicitly include one or more of such features. In the description of this application, unless otherwise stated, the meaning of "a plurality" is two or more.

[0080] In the description of the present application, it should be noted that unless otherwise clearly specified and defined, the terms "installation", "connection", and "coupling" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be a direct connection or an indirect connection through an intermediate medium, and it may be the communication inside two components. The terms "vertical", "horizontal", "left", "right", "up", "down" and similar expressions used herein are only for the purpose of illustration, rather than indicating or implying that the system or component referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present invention. The term "and / or" used herein includes any and all combinations of one or more of the related listed items. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0081] In the description of the present application, it should be noted that unless otherwise defined, all technical and scientific terms used in the present invention have the same meaning as commonly understood by those skilled in the technical field to which the present invention belongs. The terms used in the specification of the present invention are only for the purpose of describing specific embodiments, and are not intended to limit the present invention. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0082] In one embodiment, as Figure 1 shown, the first aspect of the present invention provides a method for configuring a distribution network circuit breaker applicable to a new power system, including:

[0083] S1. Obtain the topology data, fault data, and the assembly position data of the circuit breakers in the distribution network; wherein, the topology data is the real-time topology change data of the distribution network in the new power system; the fault data includes the preset fault scenarios of each line in the distribution network, that is, the possible fault scenarios of each line in the distribution network in the new power system; the assembly position data includes the substation outlet positions in the distribution network and the head and tail positions of each line in the distribution network, that is, the installable positions of the circuit breakers contained in the distribution network in the new power system. By obtaining the topology data, fault data, and the assembly position data of the circuit breakers in the new power system, the present invention enables decision-making based on the actual operation data and physical topology layout, improving the pertinence and practicability of the configuration scheme.

[0084] In one embodiment, the preset fault scenarios include historical fault scenarios and simulation fault scenarios; wherein, obtaining the fault data of the distribution network includes:

[0085] Obtain the first fault data corresponding to the historical fault scenario, and run the simulated fault scenario to obtain the second fault data corresponding to the simulated fault scenario;

[0086] Integrate the first fault data and the second fault data to obtain the fault data of the distribution network.

[0087] Specifically, the historical fault scenario is the fault scenario that has actually occurred in the past in this distribution network. The corresponding first fault data can be directly extracted from its log, and this data is also real data, including the time, location, type, impact range of the fault, and the grid state at the time of the fault, etc.; the simulated fault scenario is the fault scenario that has not occurred in this distribution network but may exist. The simulated fault scenario can also be set according to the historical fault data, which includes simulating the occurrence, development, and possible impacts of the fault. After simulation using simulation software, the second fault data corresponding to the simulated fault scenario can be obtained, which includes the changes in the grid state, fault current, voltage waveform, etc. during the simulation process. This data can be understood as simulation data or virtual data.

[0088] After cleaning and organizing the first fault data and the second fault data, establish a mapping relationship between them to ensure that they can correspond to each other. Then, use a data integration tool or platform to integrate the first fault data and the second fault data into a unified data storage; through data virtualization technology, without physically replicating the data, create a logical view with business semantics, enabling users to query, analyze, and operate the data through this logical view as if accessing a single data source, and integrate to obtain the complete fault data set of the distribution network.

[0089] By obtaining historical fault data and running simulated fault scenarios, the present invention can obtain rich fault data, thereby more accurately analyzing the causes, development processes, and impacts of faults, etc., which helps to formulate more effective fault recovery strategies and preventive measures, and improve the reliability and stability of the distribution network; the simulated fault scenarios can simulate different types of faults and different fault development situations, thereby testing the response and recovery capabilities of the distribution network under different fault conditions, which helps to formulate more flexible fault response plans to adapt to different types of faults and different fault scenarios; by integrating historical fault data and simulated fault data, more comprehensive fault information can be obtained, thereby more accurately evaluating the effects and advantages and disadvantages of different fault recovery strategies, optimizing the fault recovery strategies, improving the recovery speed and efficiency, and reducing the impact of faults on the distribution network.

[0090] S2. Through the fault data, with the goal of minimizing the load loss of the distribution network, construct a distribution network breaker configuration model; wherein, the objective function of the distribution network breaker configuration model is expressed by the following formula:

[0091]

[0092] Wherein, is 0 or 1, When it is, it means that node i is connected to fault point k, When it is, it means that node i is not connected to fault point k; is the load at node i; N is the set of nodes in the distribution network; K is the set of fault points in the distribution network.

[0093] Specifically, the breaker configuration model in the present invention is based on the fault data of the distribution network in the new power system, and is constructed with the goal of minimizing the fault area after the breaker operates to isolate the fault after the fault, that is, minimizing the sum of the load losses of the distribution network after the fault, so as to avoid the expansion of the fault influence range by optimizing the breaker configuration, reduce the impact of the fault on the overall operation of the distribution network in the new power system, and improve the stability and reliability of the distribution network.

[0094] S3. Construct a first virtual network and a second virtual network of the distribution network according to the topology data and the fault data respectively; the first virtual network is used to simulate the fault current path, and the second virtual network is used to simulate the fault state transfer path;

[0095] In one embodiment, step S3 is as Figure 2 shown and includes:

[0096] S31. Based on the topology data, use the power source point in the distribution network as the injection starting point to transfer along the closed line, and use the fault point in the fault data as the absorption end point to construct the first virtual network;

[0097] S32. Based on the topology data, use the fault point in the fault data as the injection starting point to transfer along the closed line, and use the breaker closest to the corresponding fault point as the absorption end point to construct the second virtual network.

[0098] Specifically, based on the topology data of the distribution network in the new power system, a first virtual network with the same topology structure is established. Among them, the virtual flow in the first virtual network is injected from the power source point, transferred along the closed line, and absorbed at the fault point to realize the simulation of the path from the power source to the short-circuit point. The schematic diagram of the first virtual network is as Figure 3 shown. Taking a 12-node example, the distribution network contains a power source node, 11 load nodes and 13 branches, and both ends of each branch are the configurable positions of the breaker. When branch n 11 -n 6 and branch n 9 -n 5 are tie lines and are operating normally, the switches at both ends remain open to ensure the radial operation state of the system.

[0099] Assume that in this distribution network, there are n 3 -n 4 If a fault occurs, the direction of the fault current is from the power source to the fault point, and the fault current is transmitted in the closed line; then a first virtual network with the same topological structure as the actual distribution network is established, which can change with the topological change of the distribution network. The virtual flow in the first virtual network has the same transmission characteristics as the fault current in the distribution network, and the positive direction is from both ends of the branch to the inside of the branch. The flow path of the virtual flow is used to simulate the path of the fault current in the system, as Figure 3 shown in (b). Figure 3 (b) is the flow path of the virtual flow under this topological structure, that is, the flow path of the fault current. The first virtual network can determine the flow path of the fault current under the flexible topological change of the distribution network, specifically as Figure 3 (c) and Figure 3 (d) shown. When the topology of the distribution network in the new power system changes, according to the flow characteristics of the virtual flow, an accurate simulation of the fault current path is realized.

[0100] Based on the topological data of the distribution network in the new power system and the first virtual network, a second virtual network with the same topological structure as it is established. Among them, the virtual flow in the second virtual network is injected from the fault point, transmitted along the closed line, and absorbed at the circuit breaker closest to the corresponding fault point to determine the action of the circuit breaker closest to the fault point, thereby realizing fault isolation. The schematic diagram of the second virtual network is as Figure 4 shown. Taking the structure scenario shown in Figure 3 (a) as an example to explain the second virtual network. The shaded part in the figure is the fault current path of the first virtual network. The fault state in the distribution network of the new power system propagates along the closed line from the fault point. The action of the circuit breaker can cut off the fault current. Therefore, all the circuit breakers on this path are disconnected, and virtual flow is injected from the fault line to simulate the propagation process of the fault state to construct the second virtual network. The virtual flow will be absorbed at the disconnected circuit breaker.

[0101] In this process, the second virtual network can determine the action of the circuit breaker closest to the fault location to ensure the smallest fault isolation area and reduce the power outage loss in the non-fault area. As Figure 4 (a) shown, assume that circuit breakers are configured at the heads of branches n 0 , n 1 , n 2 . The fault isolation ranges formed after their actions are respectively as Figure 4 (b), 4(c), 4(d) shown. Then, through the second virtual network, the position of the circuit breaker closest to the fault can be determined to achieve the optimal switch configuration.

[0102] The present invention utilizes the characteristic that the first virtual network can adapt to the flexible changes in the topology of the distribution network in the new power system to simulate an accurate fault current path. Since only the circuit breakers on the fault current path can effectively cut off the fault current, the first virtual network provides a basis for the implementation of the functions of the second virtual network, and uses the second virtual network to simulate the process of fault state transfer, and can clarify the characteristic of the minimum fault area of the distribution network after the circuit breaker closest to the fault point operates, so as to realize the optimal circuit breaker configuration scheme, so that the fault area of the distribution network in the new power system will be isolated after the circuit breaker operates, and the operation of the non-fault area will be restored to the greatest extent.

[0103] The present invention constructs a first virtual network to simulate the fault current path, effectively coping with the topology change of the distribution network, which helps to accurately evaluate the impact of the fault on the power grid and provides a basis for the reasonable configuration of the circuit breaker; by constructing a second virtual network to simulate the fault state transfer path, it can further analyze the propagation and diffusion of the fault in the power grid and provide strong support for formulating strategies; and the introduction of the virtual network based on the virtual flow makes the fault analysis and configuration scheme optimization process more intuitive and efficient, reducing the cost and risk of actual testing.

[0104] S4. Based on the first virtual network and the second virtual network, solve the distribution network circuit breaker configuration model through the assembly position data to obtain a circuit breaker configuration scheme to control the execution of the distribution network;

[0105] In one embodiment, step S4 is as Figure 5 shown and includes:

[0106] S41. Construct a first constraint condition and a second constraint condition according to the first virtual network and the second virtual network respectively; wherein, the first constraint condition includes a first virtual flow injection constraint, a first virtual flow absorption constraint and a first virtual flow transfer constraint; wherein,

[0107] The first virtual flow injection constraint restricts that virtual flow can only be injected from the power source point, and it is expressed by the following formula:

[0108]

[0109] In the formula, is 0 or 1, when it represents that node i is the power source point, when it represents that node i is not the power source point; and are the virtual currents flowing through the i-side and j-side of line ij in the first virtual network respectively; π(j) is the set of parent nodes of node j; o(i) is the set of child nodes of node i;

[0110] The first virtual flow absorption constraint restricts the virtual flow that can be absorbed by the faulty line, which is expressed by the following formula:

[0111]

[0112] In the formula, is 0 or 1. When it indicates that there is a fault point k on line ij. When it indicates that there is no fault point k on line ij; E is the set of lines in the distribution network;

[0113] The first virtual flow transfer constraint restricts that only closed lines can transfer virtual flow, which is expressed by the following formula:

[0114]

[0115]

[0116] In the formula, is 0 or 1. When it indicates that the i-side of line ij in the first virtual network is in a closed state. When it indicates that the i-side of line ij in the first virtual network is in an open state; is 0 or 1. When it indicates that the j-side of line ij in the first virtual network is in a closed state. When it indicates that the j-side of line ij in the first virtual network is in an open state; M is a parameter, which is a very large number.

[0117] By restricting that virtual flow can only be injected from the power source point, the present invention can effectively control the source of network traffic, prevent illegal or unauthorized traffic from being injected into the network, thereby ensuring the rationality and security of network traffic; the constraint on the absorption of virtual flow by faulty lines can ensure that when a fault occurs, the traffic can be reasonably guided to the fault handling point or the standby line, rather than spreading disorderly in the network; by restricting that only closed lines can transfer virtual flow, it can ensure that the transmission path of network traffic is reasonable and effective, which helps to optimize the allocation of network resources, avoid unnecessary resource waste and traffic congestion; and ensures the rationality of network traffic and the simulation accuracy of the fault current path.

[0118] The second constraint condition includes the second virtual flow injection constraint, the second virtual flow absorption constraint, and the second virtual flow transfer constraint; among them,

[0119] The second virtual flow injection constraint restricts that only faulty lines can inject virtual flow, which is expressed by the following formula:

[0120]

[0121] In the formula, and are the virtual currents flowing through the i - side and j - side of line ij in the second virtual network, respectively;

[0122] For the second virtual flow absorption constraint, all the circuit breakers from the power source point to the fault point are opened, and the virtual flow will be absorbed at the circuit breaker closest to the short - circuit point, which is expressed by the following formula:

[0123]

[0124]

[0125]

[0126]

[0127]

[0128]

[0129]

[0130]

[0131] In the formula, is 0 or 1. When it means that a circuit breaker is configured at the head end of line ij. When it means that no circuit breaker is configured at the head end of line ij; is 0 or 1. When it means that a circuit breaker is configured at the end of line ij. When it means that no circuit breaker is configured at the end of line ij; is 0 or 1. When it means that in the first virtual network, for the k - th fault point, a short - circuit current flows through the i - side of line ij. When it means that in the first virtual network, for the k - th fault point, no short - circuit current flows through the i - side of line ij; is 0 or 1. When it means that in the first virtual network, for the k - th fault point, a short - circuit current flows through the j - side of line ij. When it means that in the first virtual network, for the k - th fault point, no short - circuit current flows through the j - side of line ij; and are the first auxiliary variable and the second auxiliary variable, respectively;

[0132] For the second virtual flow transfer constraint, it is restricted that only the closed lines can transfer virtual flows, which is expressed by the following formula:

[0133]

[0134]

[0135] Wherein, is 0 or 1, When it is, it means that the i - side of the line ij in the second virtual network is in a closed state, When it is, it means that the i - side of the line ij in the first virtual network is in an open state; is 0 or 1, When it is, it means that the j - side of the line ij in the second virtual network is in a closed state, When it is, it means that the j - side of the line ij in the first virtual network is in an open state.

[0136] In the present invention, by restricting the injection points of virtual flows in the second virtual network, the source of the fault, that is, the fault point, can be clearly identified, which helps to quickly locate the fault position and provides accurate information for subsequent fault handling; by disconnecting the circuit breaker from the power supply point to the fault point, the fault area can be effectively isolated, preventing the further expansion and spread of the fault, which helps to protect other normally operating devices and lines and reduces the impact of the fault on the entire network; by restricting the transfer path of virtual flows, it can be ensured that the transmission path of network traffic is reasonable and effective, which helps to avoid unnecessary resource waste and traffic congestion and improves the transmission efficiency of the network.

[0137] S42. Construct the connection relationship constraints between faults, lines and nodes in the distribution network through the fault data, the first virtual network and the second virtual network, and based on the assembly position data, determine the segmentation position relationship between the fault area and the non - fault area in the distribution network according to the connection relationship constraints;

[0138] Specifically, under the first constraint condition of the first virtual network and the second constraint condition of the second virtual network, according to the fault data of the circuit breakers in the distribution network, the connection relationship constraints between faults and each line and each node in the distribution network can be established to reflect the physical characteristics of the network structure and the flow law of virtual flows; wherein, the connection relationship constraints are represented by the following formula:

[0139]

[0140]

[0141]

[0142]

[0143]

[0144] Wherein, is 0 or 1, indicating that line ij is connected to fault point k when indicating that line ij is not connected to fault point k when

[0145] Next, based on the installable positions of the circuit breakers, simulate the propagation process of the virtual flow in the second virtual network after a fault occurs, and determine the fault area according to the propagation path and absorption position of the virtual flow; where the fault area includes the fault point and its direct influence range; at the same time, find the nearest circuit breaker between the fault area and the non-fault area to determine the key points for isolating the fault area, and separate the fault area from the non-fault area by disconnecting these circuit breakers, obtaining the segmentation position relationship between the fault area and the non-fault area in the distribution network, which is represented by the following formula:

[0146]

[0147]

[0148] In the formula, is 0 or 1, indicating that the i side of line ij is the fault segmentation position when indicating that the i side of line ij is not the fault segmentation position when is 0 or 1, indicating that the j side of line ij is the fault segmentation position when indicating that the j side of line ij is not the fault segmentation position when

[0149] The present invention can effectively improve the fault handling ability and overall performance of the distribution network by constructing constraint conditions to separate the fault area and the non-fault area in the distribution network.

[0150] S43. Under the first constraint condition, the second constraint condition and the connection relationship constraint, solve the distribution network circuit breaker configuration model based on the segmentation position relationship to obtain a circuit breaker configuration scheme to control the execution of the distribution network.

[0151] Specifically, based on the foregoing various constraints and combined with the segmentation position relationship, use various commercial solution software such as Cplex and Gurobi to solve the distribution network circuit breaker configuration model, obtain a circuit breaker configuration scheme and control the execution of the distribution network. The flowchart of another distribution network circuit breaker configuration method applicable to the new power system is as Figure 6 shown, overcoming the problem that the existing circuit breaker configuration method cannot achieve fast isolation when a fault occurs in the distribution network. Under the goal of minimizing the sum of system load losses, that is, minimizing the fault area after the switch action isolates the fault, use the method based on the virtual flow network to realize the optimal configuration of the circuit breaker and improve the operation ability of the distribution network in the new power system to cope with the topological dynamic changes of the distribution network.

[0152] In one embodiment, after step S4, the method further includes:

[0153] Obtaining the topology update data of the distribution network and the assembly position update data of the circuit breakers after the execution of the circuit breaker configuration scheme;

[0154] Based on the topology update data, with the goal of the shortest duration required for the distribution network to resume operation, constructing a distribution network restoration model;

[0155] According to the assembly position update data, solving the distribution network restoration model through a preset optimization algorithm to obtain a circuit breaker configuration update scheme for controlling the execution of the distribution network.

[0156] Specifically, after the execution of the circuit breaker configuration scheme, through the monitoring system of the distribution network or by collecting in real time the topology update data of the distribution network including the connection status of each device, the on / off status of the lines, the opening / closing status of the circuit breakers, etc., and the assembly position update data of the circuit breakers including the actual installation positions and connection relationships, and cleaning and sorting out the collected data to ensure the accuracy and integrity of the data;

[0157] With the goal of the shortest duration required for the distribution network to resume operation, comprehensively considering factors such as the topology structure, load distribution, and circuit breaker configuration of the distribution network, and considering various constraints in the distribution network restoration process, such as power flow constraints, voltage and current constraints, etc., using the opening / closing status of the circuit breakers as decision variables, using concepts such as nodes, edges, and connectivity in graph theory to describe the topology update data of the distribution network, and establishing a distribution network restoration model in combination with power system simulation software. This model can simulate the restoration process of the distribution network under different circuit breaker configuration schemes and calculate the time required for restoration;

[0158] According to the complexity of the distribution network and the characteristics of the restoration model, select a suitable optimization algorithm, such as genetic algorithm, particle swarm algorithm, simulated annealing algorithm, etc.; and input the assembly position update data into the selected optimization algorithm to solve the distribution network restoration model. This optimization algorithm continuously searches for the optimal circuit breaker configuration update scheme through iterative calculations to output the optimal circuit breaker configuration update scheme, which includes the opening / closing status, adjustment sequence, and time arrangement of the circuit breakers, etc., and controls the execution of the distribution network.

[0159] By constructing a distribution network restoration model and using an optimization algorithm for solution, the present invention can quickly obtain the optimal circuit breaker configuration update scheme, thereby shortening the restoration time of the distribution network; by establishing a model using mathematical methods and power system simulation software, it can accurately simulate the restoration process of the distribution network under different circuit breaker configuration schemes, improving the accuracy of the restoration scheme; it can be flexibly adjusted according to the actual situation and fault type of the distribution network, and is applicable to different types of distribution networks and fault scenarios.

[0160] The present invention uses the IEEE 33-node distribution system structure shown in Figure 7 to verify the effectiveness and correctness of the method proposed by the present invention. As shown in Figure 7 , in the figure, node 1 is the substation node, the solid lines represent the connected lines, and the dashed lines represent the disconnected lines. With the help of the Matlab programming tool and the Cplex optimization software, the relevant method is implemented. The computer configuration is: Intel Core i5 processor (2.5 GHz), 16GB of memory. Combining the network fault status information, an intelligent circuit breaker configuration model for the distribution network in the new power system is established based on the virtual flow method. It aims to minimize the sum of load losses caused by faults and determine the optimal circuit breaker configuration scheme under given constraints. Among them, the constraints include: the first virtual flow injection constraint, the first virtual flow absorption constraint, and the first virtual flow transfer constraint of the first virtual flow network, the second virtual flow injection constraint, the second virtual flow absorption constraint, and the second virtual flow transfer constraint of the second virtual network, as well as the connection relationship constraints between faults, lines, and nodes. Under the above constraints, the schematic diagram of the circuit breaker configuration result is shown in Figure 8 . Among them, lines 1-2, 2-19, 3-23, 6-7, 6-26, and 30-31 are the circuit breaker configuration results. Through the above circuit breaker configuration scheme, it can be ensured that the fault area is minimized after the circuit breaker operates, that is, the sum of load losses of the distribution network in the new power system is minimized.

[0161] In the embodiment of the present application, based on the problem of how to improve the response ability of the circuit breaker to faults, a method for configuring the circuit breaker of the distribution network applicable to the new power system is designed. It realizes obtaining the topological data, fault data, and the assembly position data of the circuit breakers in the distribution network; through the fault data, with the goal of minimizing the load loss of the distribution network, a distribution network circuit breaker configuration model is constructed; according to the topological data and the fault data, the first virtual network and the second virtual network of the distribution network are respectively constructed; the first virtual network is used to simulate the fault current path, and the second virtual network is used to simulate the fault state transfer path; based on the first virtual network and the second virtual network, the distribution network circuit breaker configuration model is solved through the assembly position data to obtain the circuit breaker configuration scheme to control the distribution network to execute the technical solution; using the method based on the virtual flow network, by constructing the model and the virtual network to cope with the dynamic changes of the distribution network topology, the intelligent and automatic management of the distribution network circuit breaker configuration is realized.

[0162] It should be noted that although the steps in the above flowchart are shown in sequence according to the arrows, these steps are not necessarily executed in the order indicated by the arrows. Unless otherwise clearly stated in this article, there is no strict order restriction for the execution of these steps, and these steps can be executed in other orders.

[0163] In another embodiment, as Figure 9 shown, the second aspect of the present invention provides a distribution network breaker configuration system applicable to a new power system, including:

[0164] A data acquisition module 10, configured to acquire topological data, fault data, and the assembly position data of the breakers in the distribution network;

[0165] A model construction module 20, configured to construct a distribution network breaker configuration model with the goal of minimizing the load loss of the distribution network through the fault data;

[0166] A network construction module 30, configured to construct a first virtual network and a second virtual network of the distribution network according to the topological data and the fault data respectively; the first virtual network is used to simulate the fault current path, and the second virtual network is used to simulate the fault state transfer path;

[0167] A model solving module 40, configured to solve the distribution network breaker configuration model based on the first virtual network and the second virtual network through the assembly position data to obtain a breaker configuration plan for controlling the execution of the distribution network.

[0168] It should be noted that each module in the above distribution network breaker configuration system applicable to a new power system can be implemented in whole or in part by software, hardware, and their combination. The above modules can be embedded in the processor of the computer device in hardware form or be independent of it, or can be stored in the memory of the computer device in software form to facilitate the processor to call and execute the operations corresponding to the above modules. For the specific limitations of a distribution network breaker configuration system applicable to a new power system, refer to the limitations of a distribution network breaker configuration method applicable to a new power system in the above text. The two have the same functions and effects, and will not be elaborated here.

[0169] In summary, the present invention relates to the field of power system automation and optimization, and discloses a method and system for configuring distribution network circuit breakers suitable for a new power system. The method includes obtaining topological data, fault data, and the assembly position data of the circuit breakers in the distribution network; constructing a distribution network circuit breaker configuration model with the goal of minimizing the load loss of the distribution network through the fault data; respectively constructing a first virtual network and a second virtual network of the distribution network according to the topological data and the fault data; the first virtual network is used to simulate the fault current path, and the second virtual network is used to simulate the fault state transfer path; based on the first virtual network and the second virtual network, the distribution network circuit breaker configuration model is solved through the assembly position data to obtain a circuit breaker configuration plan for controlling the execution of the distribution network; by adopting a method based on a virtual flow network, the intelligent configuration of the distribution network circuit breaker in the new power system is realized by constructing a model and a virtual network to cope with the dynamic change of the distribution network topology.

[0170] Each embodiment in this specification is described in a progressive manner. For the parts that are the same or similar in each embodiment, reference can be made to each other. The key point of each embodiment is to illustrate the differences from other embodiments. In particular, for the system embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and the relevant parts can refer to the partial description of the method embodiment. It should be noted that the above technical features of the embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the above technical features in the embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope described in this specification.

[0171] The above embodiments only represent several preferred embodiments of the present application. The description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the invention patent. It should be pointed out that for those of ordinary skill in the art in this technical field, without departing from the technical principle of the present invention, several improvements and substitutions can be made, and these improvements and substitutions should also be regarded as the protection scope of the present application. Therefore, the protection scope of the patent of the present application should be subject to the protection scope of the claims.

Claims

1. A distribution network circuit breaker configuration method suitable for a new power system, characterized in that: include: Acquiring topological data, fault data and assembly position data of circuit breakers in the distribution network; By using the fault data, a distribution network circuit breaker configuration model is constructed with the goal of minimizing the load loss of the distribution network; Constructing a first virtual network and a second virtual network of the distribution network respectively according to the topology data and the fault data; the first virtual network is used to simulate a fault current path, and the second virtual network is used to simulate a fault state transmission path; Based on the first virtual network and the second virtual network, solving the distribution network circuit breaker configuration model through the assembly position data to obtain a circuit breaker configuration scheme to control the distribution network execution; The step of respectively constructing a first virtual network and a second virtual network of the power distribution network according to the topology data and the fault data comprises: Based on the topology data, the power supply point in the distribution network is used as the injection starting point and transmitted along the closed line, and the fault point in the fault data is used as the absorption end point to construct the first virtual network; Based on the topology data, the fault point in the fault data is used as an injection starting point and transmitted along a closed line, and the circuit breaker with the shortest distance to the corresponding fault point is used as an absorption end point to construct the second virtual network; The method of solving the distribution network breaker configuration model based on the first virtual network and the second virtual network through the assembly position data to obtain a breaker configuration scheme to control the distribution network execution includes: Constructing a first constraint condition and a second constraint condition respectively according to the first virtual network and the second virtual network; Constructing connection relationship constraints between faults and lines and nodes in the distribution network through the fault data, the first virtual network and the second virtual network, and determining the segmentation position relationship between the fault area and the non-fault area in the distribution network according to the connection relationship constraints based on the assembly position data; Under the first constraint condition, the second constraint condition and the connection relationship constraint, the distribution network breaker configuration model is solved based on the segmentation position relationship to obtain a breaker configuration plan to control the distribution network execution.

2. A distribution network circuit breaker configuration method applicable to a new power system according to claim 1, characterized in that: The fault data includes a preset fault scenario for each line in the distribution network; the assembly location data includes a substation exit location in the distribution network and the beginning and end locations of each line in the distribution network.

3. A distribution network circuit breaker configuration method applicable to a new power system according to claim 2, characterized in that: The preset fault scenarios include historical fault scenarios and simulated fault scenarios; wherein obtaining fault data of the distribution network includes: Acquire first fault data corresponding to the historical fault scenario, and run the simulated fault scenario to obtain second fault data corresponding to the simulated fault scenario; The first fault data and the second fault data are integrated to obtain fault data of the distribution network.

4. A distribution network circuit breaker configuration method applicable to a new power system according to claim 1, characterized in that: The first constraint condition includes a first virtual flow injection constraint, a first virtual flow absorption constraint and a first virtual flow transmission constraint; wherein, The first virtual flow injection constraint is expressed by the following formula: In the formula, is 0 or 1, When , it means that node i is a power point. When , it means that node i is not a power point; and are the virtual currents flowing through the i side and j side of the line ij in the first virtual network respectively; π(j) is the parent node set of node j; o(i) is the child node set of node i; N is the node set in the distribution network; K is the fault point set in the distribution network; The first virtual flow absorption constraint is expressed by the following formula: In the formula, is 0 or 1, When , it means there is a fault point k on line ij. When , it means that there is no fault point k on line ij; E is the set of lines in the distribution network; The first virtual flow transfer constraint is expressed by the following formula: In the formula, is 0 or 1, When , it indicates that the i side of line ij in the first virtual network is in a closed state. When , it indicates that the i side of the line ij in the first virtual network is in an open state; is 0 or 1, When , it indicates that the j side of line ij in the first virtual network is in a closed state. When , it indicates that the j side of line ij in the first virtual network is in an open state; M is a parameter.

5. A distribution network circuit breaker configuration method applicable to a new power system according to claim 4, characterized in that: The second constraint condition includes a second virtual flow injection constraint, a second virtual flow absorption constraint, and a second virtual flow transmission constraint; wherein, The second virtual flow injection constraint is expressed by the following formula: In the formula, and are respectively virtual currents flowing through the i side and j side of the line ij in the second virtual network; The second virtual flow absorption constraint is expressed by the following formula: In the formula, is 0 or 1, When , it means that the first end of line ij is equipped with a circuit breaker. When , it means that the first end of line ij is not equipped with a circuit breaker; is 0 or 1, When , it means that a circuit breaker is configured at the end of line ij. When , it means that the end of line ij is not equipped with a circuit breaker; is 0 or 1, When , it means that in the first virtual network, for the kth fault point, the short-circuit current flows through the i side of the line ij, When , it means that in the first virtual network, for the kth fault point, no short-circuit current flows through the i side of line ij; is 0 or 1, When , it means that in the first virtual network, for the kth fault point, the short-circuit current flows through the j side of the line ij, When , it means that in the first virtual network, for the kth fault point, no short-circuit current flows through the j side of line ij; and are the first auxiliary variable and the second auxiliary variable respectively; The second virtual flow transfer constraint is expressed by the following formula: In the formula, is 0 or 1, When , it means that the i side of line ij in the second virtual network is in a closed state. When , it indicates that the i side of the line ij in the first virtual network is in an open state; is 0 or 1, When , it indicates that the j side of line ij in the second virtual network is in a closed state. When , it indicates that the j side of line ij in the first virtual network is in an open state.

6. A distribution network circuit breaker configuration method applicable to a new power system according to claim 5, characterized in that: The connection relationship constraint is expressed by the following formula: In the formula, is 0 or 1, When , it means that line ij is connected to fault point k. When , it means that line ij is not connected to fault point k; is 0 or 1, When , it means that node i is connected to fault point k. When , it means that node i is not connected to fault point k; The segmentation position relationship is expressed by the following formula: In the formula, is 0 or 1, When , it means that the i side of line ij is the fault segmentation location. When , it means that the i side of line ij is not the fault segmentation location; is 0 or 1, When , it means that the j side of line ij is the fault segmentation location. When , it indicates that the j side of line ij is not the fault segmentation location.

7. A distribution network circuit breaker configuration method applicable to a new power system according to claim 1, characterized in that: The method further comprises: solving the distribution network breaker configuration model based on the first virtual network and the second virtual network through the assembly position data to obtain a breaker configuration scheme to control the distribution network to execute the scheme, comprising: Acquire topology update data of the distribution network after executing the circuit breaker configuration scheme and assembly position update data of the circuit breaker; Based on the topology update data, a distribution network restoration model is constructed with the goal of minimizing the time required for the distribution network to resume operation; According to the assembly position update data, the distribution network restoration model is solved by a preset optimization algorithm to obtain a circuit breaker configuration update scheme to control the distribution network execution.

8. A distribution network circuit breaker configuration system suitable for a new power system, characterized in that: include: A data acquisition module, used to acquire topological data, fault data and assembly position data of circuit breakers in the distribution network; A model building module, used to build a distribution network circuit breaker configuration model based on the fault data and with the goal of minimizing the load loss of the distribution network; A network construction module, configured to construct a first virtual network and a second virtual network of the distribution network according to the topology data and the fault data, respectively; the first virtual network is used to simulate a fault current path, and the second virtual network is used to simulate a fault state transmission path; A model solving module, configured to solve the distribution network circuit breaker configuration model based on the first virtual network and the second virtual network through the assembly position data, and obtain a circuit breaker configuration scheme to control the distribution network execution; The step of respectively constructing a first virtual network and a second virtual network of the power distribution network according to the topology data and the fault data comprises: Based on the topology data, the power supply point in the distribution network is used as the injection starting point and transmitted along the closed line, and the fault point in the fault data is used as the absorption end point to construct the first virtual network; Based on the topology data, the fault point in the fault data is used as an injection starting point and transmitted along a closed line, and the circuit breaker with the shortest distance to the corresponding fault point is used as an absorption end point to construct the second virtual network; The method of solving the distribution network breaker configuration model based on the first virtual network and the second virtual network through the assembly position data to obtain a breaker configuration scheme to control the distribution network execution includes: Constructing a first constraint condition and a second constraint condition respectively according to the first virtual network and the second virtual network; Constructing connection relationship constraints between faults and lines and nodes in the distribution network through the fault data, the first virtual network and the second virtual network, and determining the segmentation position relationship between the fault area and the non-fault area in the distribution network according to the connection relationship constraints based on the assembly position data; Under the first constraint condition, the second constraint condition and the connection relationship constraint, the distribution network breaker configuration model is solved based on the segmentation position relationship to obtain a breaker configuration plan to control the distribution network execution.

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