Distribution network circuit breaker configuration method and system suitable for novel power system

Abstract

The invention discloses a power distribution network circuit breaker configuration method and system suitable for a novel power system. The method comprises the steps of obtaining topological data and fault data of a power distribution network and assembly position data of a circuit breaker in the power distribution network; constructing a power distribution network circuit breaker configuration model by taking the minimum load loss of the power distribution network as a target through the fault data; respectively constructing a first virtual network and a second virtual network of the power distribution network according to the topological data and the fault data; the first virtual network is used for simulating a fault current path, and the second virtual network is used for simulating 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 so as to control the execution of the distribution network; the dynamic change of the power distribution network topology is coped with by constructing a model and a virtual network, and the intelligent configuration of the power distribution network circuit breaker is realized.

Description

Technical Field

[0001] The present invention relates to the field of power system automation and optimization, and in particular to a distribution network circuit breaker configuration method and system suitable for a new power system. Background Art

[0002] Faced with the large number of distributed power sources, controllable loads, energy storage, etc. connected to the distribution network, the stability of the distribution network is facing unprecedented challenges. To address this phenomenon, switch configuration is usually used to cope with the topology changes of complex distribution networks.

[0003] Existing circuit breaker configuration methods are usually formed based on received manual control signals, but manual control signals rely on human subjective experience, and have limited response speed and accuracy. When a fault occurs, it is impossible to achieve rapid isolation and restore power supply to the distribution network.

[0004] It can be seen that how to improve the response capability of the circuit breaker to faults has become a technical problem that needs to be urgently solved by those skilled in the art. Summary of the invention

[0005] The present invention provides a distribution network circuit breaker configuration method and system applicable to a new type of power system, which solves the problem of how to improve the circuit breaker's response capability to faults.

[0006] In order to solve the above technical problems, the first aspect of the present invention provides a distribution network circuit breaker configuration method applicable to a new power system, comprising: 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, the distribution network circuit breaker configuration model is solved through the assembly position data to obtain a circuit breaker configuration plan to control the distribution network execution.

[0007] As one of the preferred solutions, 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 start and end locations of each line in the distribution network.

[0008] As one of the preferred solutions, 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.

[0009] As one of the preferred solutions, respectively constructing a first virtual network and a second virtual network of the distribution network according to the topology data and the fault data includes: 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.

[0010] As one preferred solution, based on the first virtual network and the second virtual network, the distribution network circuit breaker configuration model is solved by the assembly position data to obtain a circuit breaker configuration solution to control the distribution network execution, including: 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.

[0011] As one preferred solution, 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.

[0012] As one preferred solution, 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 means 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.

[0013] As one of the preferred solutions, 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.

[0014] As one preferred solution, the method of solving the distribution network circuit breaker configuration model based on the first virtual network and the second virtual network through the assembly position data to obtain a circuit breaker configuration solution to control the distribution network execution includes: 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 plan to control the distribution network execution.

[0015] A second aspect of the present invention provides a distribution network circuit breaker configuration system applicable to a new power system, comprising: 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 is used 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 to obtain a circuit breaker configuration plan to control the distribution network execution.

[0016] Compared with the prior art, the embodiments of the present invention have the following advantages: (1) The method includes obtaining topological data, fault data and assembly position data of the distribution network, so that the present invention can make decisions based on the actual operation data and the physical topological layout, thereby improving the pertinence and practicality of the configuration scheme, adapting to the characteristics of different distribution networks and changes in their topological structures, and enhancing flexibility and adaptability; (2) The introduction of virtual networks makes the analysis and optimization process more intuitive and efficient, reducing the cost and risk of actual testing. The present invention constructs models and virtual networks to cope with dynamic changes in distribution network topology, thereby achieving effective and accurate intelligent configuration of distribution network circuit breakers. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solution of the present invention, the drawings required for use in the implementation mode will be briefly introduced below. Obviously, the drawings described below are only some implementation modes of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 It is a flow chart of a distribution network circuit breaker configuration method applicable to a new power system provided by a certain embodiment of the present invention; Figure 2 is a flowchart of step S3 provided by an embodiment of the present invention; Figure 3 is a first virtual network schematic diagram provided by an embodiment of the present invention; Figure 4 is a schematic diagram of a second virtual network provided by an embodiment of the present invention; Figure 5 is a flowchart of step S4 provided by an embodiment of the present invention; Figure 6 is a flow chart of a distribution network circuit breaker configuration method applicable to a new power system provided by another embodiment of the present invention; Figure 7 is a structural diagram of an IEEE 33-node power distribution system provided by a certain embodiment of the present invention; Figure 8 is a schematic diagram of a circuit breaker configuration result provided by an embodiment of the present invention; Fig. 9 It is a structural diagram of a distribution network circuit breaker configuration system applicable to a new power system provided by a certain embodiment of the present invention. DETAILED DESCRIPTION

[0019] The following is a clear and complete description of the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings and embodiments. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of 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 ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0020] In the description of this application, the terms "first", "second", "third", etc. are used for descriptive purposes only and are not to be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first", "second", "third", etc. may explicitly or implicitly include one or more of the feature. In the description of this application, unless otherwise specified, "plurality" means two or more.

[0021] In the description of the present application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be a connection between the two components. The terms "vertical", "horizontal", "left", "right", "upper", "lower" and similar expressions used herein are for illustrative purposes only, and do not indicate or imply that the system or component referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0022] In the description of this application, it should be noted that, unless otherwise defined, all technical and scientific terms used in the present invention have the same meaning as those commonly understood by those skilled in the art. 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 this application can be understood by specific circumstances.

[0023] In one embodiment, if Figure 1 As shown, the first aspect of the present invention provides a distribution network circuit breaker configuration method applicable to a new power system, comprising: S1. Obtain the topological data, fault data and assembly position data of the circuit breaker in the distribution network; wherein the topological data is the real-time topological change data of the distribution network in the new power system; the fault data includes the preset fault scenario of each line in the distribution network, that is, the possible fault scenario of each line in the distribution network in the new power system; the assembly position data includes the substation exit position in the distribution network and the first and end positions of each line in the distribution network, that is, the possible assembly position of the circuit breaker contained in the distribution network in the new power system. The present invention obtains the topological data, fault data and assembly position data of the distribution network in the new power system, so that decisions can be made based on the actual operation data and the physical topological layout, thereby improving the pertinence and practicality of the configuration scheme.

[0024] In one embodiment, the preset fault scenario includes a historical fault scenario and a simulated fault scenario; wherein obtaining the 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.

[0025] Specifically, the historical fault scenario is a fault scenario that has actually occurred in the distribution network in the past. The corresponding first fault data can be directly extracted from its log. The data is also real data, including the time, location, type, impact range of the fault, and the state of the power grid at the time of the fault; the simulated fault scenario is a fault scenario that has not occurred in the distribution network but may exist. The simulated fault scenario can also be set according to the historical fault data, which includes the occurrence, development and possible impact of simulated faults. After simulation using simulation software, the second fault data corresponding to the simulated fault scenario can be obtained, which includes the changes in the power grid state, fault current, voltage waveform, etc. during the simulation process. The data can be understood as simulated data or virtual data.

[0026] After the first fault data and the second fault data are cleaned and sorted, a mapping relationship between the two is established to ensure that they correspond to each other. Then, the first fault data and the second fault data are integrated into a unified data storage using a data integration tool or platform. Through data virtualization technology, a logical view with business semantics is created without physically copying the data, so that users can query, analyze and operate the data through the logical view as if accessing a single data source for integration, and obtain a complete fault data set for the distribution network.

[0027] The present invention can obtain rich fault data by acquiring historical fault data and running simulated fault scenarios, so as to more accurately analyze the cause, development process and impact of the fault, which is helpful 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, so as to test the response and recovery capabilities of the distribution network under different fault conditions, and help 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, so as to more accurately evaluate the effects and advantages and disadvantages of different fault recovery strategies, so as to optimize the fault recovery strategy, improve the recovery speed and efficiency, and reduce the impact of faults on the distribution network.

[0028] S2. Based on the fault data, a distribution network circuit breaker configuration model is constructed with the goal of minimizing the load loss of the distribution network; wherein the objective function of the distribution network circuit breaker configuration model is expressed by the following formula: In the formula, 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; 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.

[0029] Specifically, the distribution network circuit 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 circuit 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 impact range by optimizing the circuit 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.

[0030] S3, 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; In one embodiment, step S3 is as follows Figure 2 As shown, including: S31. 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; S32. 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.

[0031] Specifically, based on the topological data of the distribution network in the new power system, a first virtual network with a consistent topological structure is established, wherein the virtual flow in the first virtual network is injected from the power source point, transmitted along the closed line, and absorbed at the fault point to realize the path simulation from the power source to the short-circuit point. The schematic diagram of the first virtual network is shown in Figure 3 As shown in the figure, taking 12 nodes as an example, the distribution network includes a power node, 11 load nodes and 13 branches, and both ends of each branch are configurable positions for circuit breakers. 11 -n6 and branch n9-n5 are interconnecting lines and operate normally, the switches at both ends remain disconnected to ensure the radial operation of the system.

[0032] Assuming that a fault occurs at n3-n4 in the distribution network, the direction of the fault current is from the power source to the fault point, and the fault current is transmitted in a closed circuit; then a first virtual network with a topological structure consistent with the actual distribution network is established, which can change with the topology of the distribution network. The virtual flow in the first virtual network has consistent transmission characteristics with the fault current in the distribution network, and the positive direction is from the two ends of the branch to the inside of the branch. The flow path of the virtual flow is used to simulate the fault current path in the system, such as Figure 3 (b) Figure 3 (b) is the virtual flow path under the topology structure, that is, the fault current flow path. The first virtual network can determine the fault current flow path when the topology of the distribution network changes flexibly, as shown in the following example. Figure 3 (c) and Figure 3 As shown in (d), when the topology of the distribution network in the new power system changes, accurate simulation of the fault current path is achieved based on the virtual flow characteristics.

[0033] Based on the topological data of the distribution network in the new power system and the first virtual network, a second virtual network with a consistent topological structure is established, wherein 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, so as 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 shown in Figure 4 As shown, Figure 3The second virtual network is explained by taking the structural scenario shown in (a) as an example. 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 is propagated from the fault point along the closed line. The circuit breaker action can cut off the fault current, so all circuit breakers on the path are disconnected, and virtual flow is injected from the fault line to simulate the fault state propagation process to construct the second virtual network. The virtual flow will be absorbed at the disconnected circuit breaker.

[0034] In this process, the second virtual network can determine the circuit breaker closest to the fault location to ensure the smallest fault isolation area and reduce the power outage losses in non-fault areas. Figure 4 As shown in (a), it is assumed that circuit breakers are configured at the headends of branches n0, n1, and n2. The fault isolation ranges formed after their operation are as follows: Figure 4 (b), 4(c), and 4(d), then the position of the circuit breaker closest to the fault can be determined through the second virtual network to achieve the optimal switch configuration.

[0035] The present invention utilizes the characteristic that the first virtual network can adapt to the flexible changes of the distribution network topology in the new power system to simulate the accurate fault current path. Since only the action of the circuit breaker on the fault current path can effectively cut off the fault current, the first virtual network provides a functional realization basis for the second virtual network, and utilizes the second virtual network to simulate the fault state transmission process, and can clearly define the characteristics of the minimum fault area of ​​the distribution network after the circuit breaker closest to the fault point is actuated, thereby realizing 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 is actuated, and the operation of the non-fault area will be restored to the greatest extent.

[0036] The present invention constructs a first virtual network to simulate the fault current path, effectively responds to changes in the distribution network topology, 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 transmission path, the propagation and diffusion of the fault in the power grid can be further analyzed, providing strong support for the formulation of strategies; and the introduction of a virtual network based on virtual flow makes the fault analysis and configuration scheme optimization process more intuitive and efficient, reducing the cost and risk of actual testing.

[0037] S4. 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; In one embodiment, step S4 is as follows: Figure 5 As shown, including: S41, constructing 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 transmission constraint; wherein, The first virtual flow injection constraint restricts that the virtual flow can be injected only from the power supply point, which 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 respectively the virtual currents flowing through the i side and j side of the line ij in the first virtual network; π(j) is the parent node set of node j; o(i) is the child node set of node i; The first virtual flow absorption constraint constrains the virtual flow that the fault line can absorb, which 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 transmission constraint constrains that only closed circuits can transmit virtual flows, which 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 means 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.

[0038] The present invention can effectively control the source of network traffic by restricting that virtual flows can be injected only from power supply points, prevent illegal or unauthorized traffic from being injected into the network, and thus ensure the rationality and security of network traffic; the constraint that the fault line absorbs virtual flows can ensure that when a fault occurs, the traffic can be reasonably guided to the fault processing point or spare line instead of being disorderly diffused in the network; by restricting that only closed lines can transmit virtual flows, it can ensure that the transmission path of network traffic is reasonable and effective, which helps to optimize the configuration of network resources and avoid unnecessary waste of resources and traffic congestion; the rationality of network traffic and the simulation accuracy of the fault current path are ensured.

[0039] 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, The second virtual flow injection constraint constrains that only the faulty line can be injected into the virtual flow, which 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 disconnects all circuit breakers from the power source point to the fault point, and the virtual flow will be absorbed at the circuit breaker closest to the short-circuit point, which 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 transmission constraint constrains that only closed circuits can transmit virtual flows, which 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 means 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.

[0040] The second virtual network in the present invention can clearly identify the source of the fault, that is, the fault point, by limiting the injection point of the virtual flow, which helps to quickly locate the fault location and provide 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 to prevent the fault from further expanding and spreading, which helps to protect other normally operating equipment and lines and reduce the impact of the fault on the entire network; by limiting the transmission path of the virtual flow, it can ensure that the transmission path of the network traffic is reasonable and effective, which helps to avoid unnecessary waste of resources and traffic congestion and improve the transmission efficiency of the network.

[0041] S42, constructing a connection relationship constraint between the fault and the line and the node in the distribution network through the fault data, the first virtual network and the second virtual network, and determining a segmentation position relationship between the fault area and the non-fault area in the distribution network according to the connection relationship constraint based on the assembly position data; Specifically, under the first constraint condition of the first virtual network and the second constraint condition of the second virtual network, the connection relationship constraint between the fault in the distribution network and each line and each node can be established according to the fault data of the circuit breaker in the distribution network to reflect the physical characteristics of the network structure and the flow law of the virtual flow; wherein 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.

[0042] Then, based on the available assembly positions of the circuit breakers, the propagation process of the virtual flow after the fault occurs is simulated in the second virtual network, and the fault area is determined according to the propagation path and absorption position of the virtual flow; wherein the fault area includes the fault point and its direct impact range; at the same time, between the fault area and the non-fault area, the nearest circuit breaker is found to determine the key point of isolating the fault area, and by disconnecting these circuit breakers, the fault area is separated from the non-fault area, and the segmentation position relationship between the fault area and the non-fault area in the distribution network is obtained, which 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.

[0043] The present invention separates the fault area from the non-fault area in the distribution network by constructing constraint conditions, which can effectively improve the fault handling capability and overall performance of the distribution network.

[0044] S43. Under the first constraint condition, the second constraint condition and the connection relationship constraint, the distribution network circuit breaker configuration model is solved based on the segmentation position relationship to obtain a circuit breaker configuration plan to control the distribution network execution.

[0045] Specifically, based on the aforementioned constraints and combined with the segmentation position relationship, various commercial solution software such as Cplex and Gurobi are used to solve the distribution network circuit breaker configuration model, obtain the circuit breaker configuration scheme and control the distribution network execution. The flowchart of another distribution network circuit breaker configuration method suitable for the new power system is as follows Figure 6As shown, the problem that the existing circuit breaker configuration method cannot achieve rapid isolation when a distribution network fault occurs is overcome. Under the goal of minimizing the fault area after the switch action isolates the fault after the fault, that is, minimizing the sum of system load losses, a method based on virtual flow network is adopted to achieve optimal configuration of circuit breakers and improve the operating capacity of the distribution network in the new power system to cope with the dynamic changes in the topology of the distribution network.

[0046] In one embodiment, after step S4, the method further includes: 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 plan to control the distribution network execution.

[0047] Specifically, after the circuit breaker configuration plan is executed, the distribution network monitoring system or real-time collection of distribution network topology update data including the connection status of each device, the on / off status of the line, the opening and closing status of the circuit breaker, and the assembly position update data of the circuit breaker including the actual installation position and connection relationship are collected, and the collected data are cleaned and sorted to ensure the accuracy and completeness of the data; With the goal of minimizing the time required for the distribution network to resume operation, the topological structure, load distribution, circuit breaker configuration and other factors of the distribution network are comprehensively considered, and various constraints in the distribution network restoration process, such as power flow constraints, voltage and current constraints, are considered. The opening and closing states of the circuit breaker are not decision variables, and the concepts of nodes, edges and connectivity in graph theory are used to describe the topological update data of the distribution network. A distribution network restoration model is established in combination with power system simulation software. The model can simulate the restoration process of the distribution network under different circuit breaker configuration schemes and calculate the time required for restoration. According to the complexity of the distribution network and the characteristics of the recovery model, a suitable optimization algorithm is selected, such as genetic algorithm, particle swarm algorithm, simulated annealing algorithm, etc.; and the assembly position update data is input into the selected optimization algorithm to solve the distribution network recovery model. The optimization algorithm continuously searches for the optimal circuit breaker configuration update scheme through iterative calculation to output the optimal circuit breaker configuration update scheme, which includes the opening and closing status of the circuit breaker, adjustment sequence and time arrangement, etc., and controls the execution of the distribution network.

[0048] The present invention constructs a distribution network restoration model and uses an optimization algorithm to solve it, so as to quickly obtain the optimal circuit breaker configuration update plan, thereby shortening the restoration time of the distribution network; the model is established by using mathematical methods and power system simulation software, so as to accurately simulate the restoration process of the distribution network under different circuit breaker configuration plans and improve the accuracy of the restoration plan; it can be flexibly adjusted according to the actual situation of the distribution network and the fault type, and is suitable for different types of distribution networks and fault scenarios.

[0049] The present invention adopts Figure 7 The IEEE 33-node power distribution system structure shown in FIG. 1 verifies the effectiveness and correctness of the method proposed in the present invention. Figure 7 As shown in the figure, node 1 is a substation node, the solid line represents the connected line, and the dotted line represents the disconnected line. The relevant methods were implemented with the help of Matlab programming tools and Cplex optimization software. The computer configuration is: Intel Core i5 processor (2.5 GHz), 16GB memory. Combined with 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. The model aims to minimize the sum of load losses caused by faults and determine the optimal circuit breaker configuration scheme under given constraints; wherein the constraints include: the first virtual flow injection constraint, the first virtual flow absorption constraint, and the first virtual flow transmission constraint of the first virtual flow network, the second virtual flow injection constraint, the second virtual flow absorption constraint, and the second virtual flow transmission constraint of the second virtual network, and the connection relationship constraint between the fault and the line and node. Under the above constraints, the schematic diagram of the circuit breaker configuration result is calculated as shown in Figure 8 As shown, 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 is operated, that is, the sum of the load losses of the distribution network in the new power system is minimized.

[0050] In the embodiment of the present application, based on the problem of how to improve the responsiveness of the circuit breaker to faults, a distribution network circuit breaker configuration method suitable for a new power system is designed, which realizes obtaining the topological data, fault data and assembly position data of the circuit breaker in the distribution network; through the fault data, a distribution network circuit breaker configuration model is constructed with the goal of minimizing the load loss of the distribution network; a first virtual network and a second virtual network of the distribution network are respectively constructed 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 transmission 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 scheme to control the technical scheme of the distribution network execution; a method based on a virtual flow network is adopted, and by constructing a model and a virtual network to cope with the dynamic changes in the distribution network topology, the intelligent and automated management of the distribution network circuit breaker configuration is realized.

[0051] 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 specified in this document, there is no strict order restriction for the execution of these steps, and these steps can be executed in other orders.

[0052] In another embodiment, if Fig. 9 As shown, the second aspect of the present invention provides a distribution network circuit breaker configuration system applicable to a new power system, comprising: A data acquisition module 10, used to acquire topological data, fault data and assembly position data of circuit breakers in the distribution network; A model building module 20, configured 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 30, 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; 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; The model solving module 40 is used 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 to obtain a circuit breaker configuration solution to control the distribution network execution.

[0053] It should be noted that each module in the above-mentioned distribution network circuit breaker configuration system suitable for a new power system can be fully or partially implemented by software, hardware and a combination thereof. The above-mentioned modules can be embedded in or independent of the processor in the computer device in the form of hardware, or can be stored in the memory of the computer device in the form of software, so that the processor can call and execute the operations corresponding to the above modules. For the specific definition of a distribution network circuit breaker configuration system suitable for a new power system, please refer to the above definition of a distribution network circuit breaker configuration method suitable for a new power system. The two have the same functions and effects, which will not be repeated here.

[0054] In summary, the present invention relates to the field of power system automation and optimization, and discloses a distribution network circuit breaker configuration method and system suitable for a new power system, the method comprising acquiring topological data, fault data and assembly position data of the circuit breaker in the distribution network; constructing a distribution network circuit breaker configuration model through the fault data 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 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 transmission 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 scheme to control the execution of the distribution network; adopting a method based on a virtual flow network, by constructing a model and a virtual network to cope with the dynamic changes in the distribution network topology, the intelligent configuration of the distribution network circuit breaker in the new power system is realized.

[0055] Each embodiment in this specification is described in a progressive manner, and the same or similar parts of each embodiment can be directly referred to each other, and each embodiment focuses on 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 be referred to the partial description of the method embodiment. It should be noted that the technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, all possible combinations of the technical features in the above-mentioned embodiments are not described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0056] The above-mentioned embodiments only express several preferred implementation modes of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in the technical field, several improvements and substitutions can be made without departing from the technical principles of the present invention, 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 shall be based on 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, the distribution network circuit breaker configuration model is solved through the assembly position data to obtain a circuit 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 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.

5. A distribution network circuit breaker configuration method applicable to a new power system according to claim 1, characterized in that: 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.

6. A distribution network circuit breaker configuration method applicable to a new power system according to claim 5, 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.

7. A distribution network circuit breaker configuration method applicable to a new power system according to claim 6, 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 transfer 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 means 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.

8. A distribution network circuit breaker configuration method applicable to a new power system according to claim 7, 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.

9. 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 plan to control the distribution network execution.

10. 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 is used 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 to obtain a circuit breaker configuration plan to control the distribution network execution.

Images