Power system survivability evaluation method and device, terminal equipment and storage medium

Abstract

The invention discloses a survivability evaluation method and device of a power system, terminal equipment and a storage medium. The method comprises the following steps: acquiring a network topology model recording a plurality of power nodes of the power system and a topological structure of a power transmission line; calculating a line importance index of each power transmission line according to the network topology model; calculating node weights of power nodes connected with the power transmission lines according to the line importance indexes; calculating an aggregation coefficient of each power node according to the network topology model; calculating a node importance index of each power node according to the node weight and the aggregation coefficient; and calculating the survivability score of the power system according to the node importance index and the line importance index. According to the method, the survivability of the power system is analyzed from the two parts of the power transmission line and the power nodes, the clustering coefficient is also considered, and the survivability of the power grid is measured from the level of the local topological structure, so that the overall survivability of the power system can be evaluated more accurately.

Description

Technical Field

[0001] The present invention relates to the field of electric power technology, and in particular to a method, device, terminal equipment and storage medium for evaluating the invulnerability of an electric power system. Background Art

[0002] The power system is the first target to be destroyed in unconventional scenarios. Its safe and stable operation is not only the basis and prerequisite for the smooth implementation of my country's energy security strategy. "Resilience" as a new concept describes the resistance of the power system to external pressure, interference or attack. The assessment of the resilience of the built power system is of great significance to the operation and improvement decision-making of the power system. At present, when conducting the assessment of the resilience of the power system, it is mainly from a macro perspective, focusing on the abstract modeling of the power grid, that is, analyzing the topological characteristics of the power grid from the perspective of the entire power grid, and establishing the connection between the characteristic indicators and the resilience of the power grid.

[0003] The grid is composed of two parts: branches and nodes. The more irreplaceable a branch or node is, the more important it is. That is, when a branch or node with a higher degree of importance fails, the greater the possibility of a grid failure, and the higher the cost of repairing the failure. Therefore, when designing the topology of the grid, it is necessary to fully consider the redundancy and decentralization of the system structure, so that the load can be flexibly adjusted and distributed in the face of failures to enhance the invulnerability. However, existing research rarely starts from the microscopic perspective of components and combines the importance of each component of the grid to evaluate the overall invulnerability of the grid. Summary of the invention

[0004] The embodiments of the present invention provide a method, apparatus, terminal device and storage medium for evaluating the indestructibility of an electric power system, which analyzes the indestructibility of an electric power system from two aspects: transmission lines and power nodes, and also considers the clustering coefficient, measuring the indestructibility of the power grid from the level of local topology. Therefore, the present invention can more accurately evaluate the overall indestructibility of the electric power system.

[0005] An embodiment of the present invention provides a method for evaluating the invulnerability of a power system, comprising:

[0006] Obtaining a network topology model recording a topological structure of a plurality of power nodes and a transmission line of a power system;

[0007] According to the network topology model, the power flow transfer entropy of each transmission line is determined, and the line importance index of each transmission line is calculated according to the power flow transfer entropy; wherein the power flow transfer entropy is used to characterize the power flow impact on other transmission lines after a failure of any transmission line in the power system;

[0008] Calculating the node weight of the power node connected to each transmission line according to the line importance index;

[0009] Calculating the clustering coefficient of each power node according to the network topology model;

[0010] Calculating a node importance index of each power node according to the node weight and the clustering coefficient;

[0011] The invulnerability score of the power system is calculated according to the node importance index and the line importance index.

[0012] Furthermore, the calculating of the line importance index of each transmission line according to the network topology model includes:

[0013] Obtain the maximum transmission power of several transmission lines;

[0014] Traversing the transmission lines in the network topology model, obtaining the initial power flow of the first transmission line currently traversed when it is operating normally, and then setting the first transmission line to be out of service due to a fault;

[0015] Determine a transmission line that shares the power flow of the first transmission line as a second transmission line, and calculate the power flow transfer amount shared by the second transmission line;

[0016] Calculating a transmission margin ratio of each second transmission line according to the initial power flow, the power flow transfer amount of each second transmission line, and the maximum transmission power of each second transmission line;

[0017] Calculating the power flow transfer entropy of the first transmission line according to the transmission margin ratio; wherein the power flow transfer entropy is used to characterize the power flow impact on other transmission lines after a failure of any transmission line in the power system;

[0018] Calculating a line importance index of a first transmission line according to the power flow transfer entropy and the initial power flow;

[0019] When the traversal is completed, a line importance index for each transmission line is generated.

[0020] Further, calculating the power flow transfer entropy of the first transmission line according to the transmission margin ratio includes:

[0021] The power flow transfer entropy of the power system is calculated according to the following formula:

[0022]

[0023] Where H is the power flow transfer entropy, N is the set of the second transmission lines, γ kl is the transmission margin ratio of the kth second transmission line in N.

[0024] Furthermore, the calculating the clustering coefficient of each power node according to the network topology model includes:

[0025] Traversing the power nodes in the network topology model, and acquiring a plurality of second power nodes connected to the currently traversed first power node;

[0026] According to the network topology model, calculating the number of triangles formed by the first power node and any two second power nodes;

[0027] Calculating a clustering coefficient of the first power node according to the total number of the second power nodes and the number of triangles;

[0028] When the traversal is complete, the clustering coefficient of each power node is generated.

[0029] Further, the calculating the clustering coefficient of the first power node according to the total number of the second power nodes and the number of triangles includes:

[0030] The clustering coefficient of the first power node is calculated by the following formula:

[0031]

[0032] Among them, c i is the clustering coefficient of the first power node, e i is the number of triangles formed between the first power node and any two of its second power nodes, k i is the total number of second power nodes.

[0033] Further, the calculating the invulnerability score of the power system according to the node importance index and the line importance index of the transmission line includes:

[0034] Determining the edge weight of each transmission line in the network topology model according to the line importance index of the transmission line;

[0035] Determine the power node connected to the transmission line whose edge weight meets the preset threshold as the target power node;

[0036] Calculating a first sum of node importance indicators of the target power nodes and a second sum of node importance indicators of all power nodes;

[0037] A destruction resistance score of the power system is calculated according to the first sum and the second sum.

[0038] Further, calculating the invulnerability score of the power system according to the first sum and the second sum includes:

[0039] The invulnerability score of the power system is calculated by the following formula:

[0040]

[0041] Wherein, Z(G) is the invulnerability score of the power system, ε is the preset correction coefficient, is the second total number, P(i) is the node importance index of the i-th power node, P′(i) is the node importance index of the i-th target power node, N′ B is the set of target power nodes, N B A collection of power nodes.

[0042] Another embodiment of the present invention provides a device for evaluating the invulnerability of a power system, comprising:

[0043] A model acquisition module, used to acquire a network topology model recording a plurality of power nodes and a topological structure of a transmission line of a power system;

[0044] A line evaluation module is used to determine the power flow transfer entropy of each transmission line according to the network topology model, and calculate the line importance index of each transmission line according to the power flow transfer entropy; wherein the power flow transfer entropy is used to characterize the power flow impact on other transmission lines after any transmission line failure in the power system;

[0045] A weight calculation module, used to calculate the node weight of the power node connected to each transmission line according to the line importance index;

[0046] A coefficient calculation module, used to calculate the aggregation coefficient of each power node according to the network topology model;

[0047] A node evaluation module, used to calculate a node importance index of each power node according to the node weight and the clustering coefficient;

[0048] A network evaluation module is used to calculate the invulnerability score of the power system according to the node importance index and the line importance index.

[0049] Another embodiment of the present invention provides a terminal device, including a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor, wherein when the processor executes the computer program, it implements a method for assessing the indestructibility of an electric power system as described in any one of the embodiments.

[0050] Another embodiment of the present invention provides a storage medium, which includes a stored computer program, wherein when the computer program is running, the device where the storage medium is located is controlled to execute a method for assessing the invulnerability of an electric power system as described in any one of the above embodiments.

[0051] The following beneficial effects are achieved by implementing the present invention:

[0052] The present invention discloses a method, device, terminal equipment and storage medium for evaluating the invulnerability of a power system, by obtaining a network topology model recording the topological structure of several power nodes and transmission lines of the power system; according to the network topology model, determining the power flow transfer entropy of each transmission line, and calculating the line importance index of each transmission line according to the power flow transfer entropy; according to the line importance index, calculating the node weight of the power nodes connected to each transmission line; according to the network topology model, calculating the clustering coefficient of each power node; according to the node weight and the clustering coefficient, calculating the node importance index of each power node; according to the node importance index and the line importance index, calculating the invulnerability score of the power system. It can be understood that the present invention determines the importance of the transmission line according to the impact of the transmission line failure on other lines, and determines the importance of the power node according to the clustering coefficient of the power node itself and the importance of the connected transmission line, so as to accurately judge the redundancy and decentralization of the power system. It can be understood that when the power system has more components with high importance indexes, it means that the redundancy and decentralization of the power system are less and the invulnerability is lower. Therefore, the present invention can more accurately evaluate the invulnerability of the power system as a whole according to the component importance index. BRIEF DESCRIPTION OF THE DRAWINGS

[0053] Figure 1 It is a flow chart of a method for evaluating the invulnerability of a power system provided by an embodiment of the present invention.

[0054] Figure 2 It is a schematic diagram of the structure of a power system survivability assessment device provided by one embodiment of the present invention. DETAILED DESCRIPTION

[0055] In order to make the purpose, technical solutions and advantages of this application clearer, the technical solutions in this application will be clearly and completely described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0056] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0057] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0058] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0059] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, indicating that there may be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0060] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0061] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like 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 an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0062] See also Figure 1 , is a flow chart of a method for evaluating the invulnerability of a power system provided by an embodiment of the present invention, comprising:

[0063] S1. Obtaining a network topology model recording a plurality of power nodes and a topological structure of a transmission line of a power system;

[0064] S2. Determine the power flow transfer entropy of each transmission line according to the network topology model, and calculate the line importance index of each transmission line according to the power flow transfer entropy; wherein the power flow transfer entropy is used to characterize the power flow impact on other transmission lines after a failure of any transmission line in the power system;

[0065] Preferably, the power flow transfer entropy of each transmission line is determined according to the network topology model, and the line importance index of each transmission line is calculated according to the power flow transfer entropy; wherein the power flow transfer entropy is used to characterize the power flow impact on other transmission lines after a failure of any transmission line in the power system, including:

[0066] S21. Obtaining the maximum transmission power of a plurality of transmission lines;

[0067] S22, traversing the transmission lines in the network topology model, obtaining the initial power flow of the first transmission line currently traversed when it is operating normally, and then setting the first transmission line to be out of service due to a fault;

[0068] S23, determining a transmission line that shares the power flow of the first transmission line as a second transmission line, and calculating a power flow transfer amount shared by the second transmission line;

[0069] S24, calculating the transmission margin ratio of each second transmission line according to the initial power flow, the power flow transfer amount of each second transmission line, and the maximum transmission power of each second transmission line;

[0070] Preferably, calculating the power flow transfer entropy of the first transmission line according to the transmission margin ratio includes:

[0071] S241. Calculate the power flow transfer entropy of the power system according to the following formula:

[0072]

[0073] Where H is the power flow transfer entropy, N is the set of the second transmission lines, γ kl is the transmission margin ratio of the kth second transmission line in N.

[0074] S25. Calculate the power flow transfer entropy of the first transmission line according to the transmission margin ratio; wherein the power flow transfer entropy is used to characterize the power flow impact on other transmission lines after a failure of any transmission line in the power system;

[0075] S26. Calculating a line importance index of the first transmission line according to the power flow transfer entropy and the initial power flow;

[0076] S27. When the traversal is completed, generate a line importance index for each transmission line.

[0077] In a preferred embodiment of the present invention, when the power grid faces extreme event interference and a branch l is disconnected due to a fault, it will cause a large-scale transfer and redistribution of the power flow. The power flow transfer entropy H, as a function that characterizes the system state, can quantitatively describe the distribution state of the power flow borne by a branch after it is disconnected on other branches and its power flow impact on the power grid, thereby reflecting the importance of the branch in the power grid. Specifically, the line importance index B(l) of a branch l (transmission line l) is defined as follows:

[0078]

[0079] Where P l0 is the initial power flow of branch l, and H is the power flow transfer entropy. This formula shows that the larger the initial power flow of branch l, the smaller the power flow transfer entropy H, the greater the impact on the system after it is disconnected, and the more important the branch is. However, the traditional power flow transfer entropy does not consider the impact of the branch transmission margin on the system, and simply assumes that the transfer power after the branch is disconnected is evenly distributed in all branches. If the transmission margin of some branches is too small, overload may occur. In view of the above problems, this embodiment takes into account the branch safety constraints and defines the improved power flow transfer entropy as follows:

[0080]

[0081] Where N is the set of all other branches that do not include branch l, γ kl is the transmission margin ratio of a branch k in N, P k,max is the maximum transmission power of branch k, ΔP kl is the power flow transfer amount shared by branch k when branch l fails and stops operating, P k0 is the initial power flow of branch k, P kl is the power flow of branch k after branch l is taken out of operation.

[0082] S3. Calculate the node weight of the power node connected to each transmission line according to the line importance index;

[0083] S4. Calculate the clustering coefficient of each power node according to the network topology model;

[0084] Preferably, the calculating the clustering coefficient of each power node according to the network topology model includes:

[0085] S41, traversing the power nodes in the network topology model, and acquiring a number of second power nodes connected to the currently traversed first power node;

[0086] S42. Calculate the number of triangles formed by the first power node and any two second power nodes according to the network topology model;

[0087] S43, calculating a clustering coefficient of the first power node according to the total number of the second power nodes and the number of triangles;

[0088] Preferably, calculating the clustering coefficient of the first power node according to the total number of the second power nodes and the number of triangles includes:

[0089] S431. Calculate the clustering coefficient of the first power node by the following formula:

[0090]

[0091] Among them, c i is the clustering coefficient of the first power node, e i is the number of triangles formed between the first power node and any two of its second power nodes, k i is the total number of second power nodes.

[0092] S44. When the traversal is completed, generate a clustering coefficient for each power node.

[0093] S5. Calculate the node importance index of each power node according to the node weight and the clustering coefficient;

[0094] In a preferred embodiment of the present invention, the importance index of the line is used as the weight, and the node importance index is constructed in combination with the clustering coefficient to evaluate the importance of the power nodes in the power system. Specifically, the importance evaluation index P(i) of the power node i is defined as follows:

[0095]

[0096] Among them, f i It represents the sum of the weighted degrees of power node i and its adjacent power nodes. The specific calculation formula is:

[0097]

[0098] g i Indicates the closeness between power node i and its adjacent power nodes. The specific calculation formula is:

[0099]

[0100] Where NB is the total number of power system network nodes, D W (i) is the weighted degree of power node i, R i is the set of transmission lines connected to node i, Γ i is the set of adjacent nodes of node i, c i is the clustering coefficient of power node i, e i is the number of triangles formed between node i and any two of its neighboring nodes, k i is the total number of adjacent nodes of node i.

[0101] S6. Calculate the invulnerability score of the power system according to the node importance index and the line importance index.

[0102] Preferably, the calculating the invulnerability score of the power system according to the node importance index and the line importance index of the transmission line comprises:

[0103] S61, determining the edge weight of each transmission line in the network topology model according to the line importance index of the transmission line;

[0104] S62, determining the power node connected to the transmission line whose edge weight meets the preset threshold as the target power node;

[0105] S63, calculating a first sum of node importance indicators of the target power nodes and a second sum of node importance indicators of all power nodes;

[0106] S64. Calculate the invulnerability score of the power system according to the first sum and the second sum.

[0107] Preferably, calculating the invulnerability score of the power system according to the first sum and the second sum includes:

[0108] The invulnerability score of the power system is calculated by the following formula:

[0109]

[0110] Wherein, Z(G) is the invulnerability score of the power system, ε is the preset correction coefficient, is the second total number, P(i) is the node importance index of the i-th power node, P′(i) is the node importance index of the i-th target power node, N′ B is the set of target power nodes, N B A collection of power nodes.

[0111] In a preferred embodiment of the present invention, the above two indicators are combined to define the invulnerability score of the power system taking into account the importance of components, and a comprehensive evaluation of the invulnerability of the power system is performed. Specifically, the comprehensive invulnerability index Z(G) of the power system G is defined as follows:

[0112]

[0113] Among them, ε is the correction coefficient, which mainly controls the influence of standard deviation on comprehensive invulnerability, usually taken as [10,50], D is the standard deviation of network node importance, and the specific calculation formula is:

[0114]

[0115] Where P(i) is the importance of power node i, N B is the total number of nodes in the power system, is the sum of the importance of all nodes in the network G, It is the sum of the importance of all nodes in the fully connected network with edge weight 1 corresponding to network G.

[0116] This embodiment provides a method for evaluating the invulnerability of a power system, by obtaining a network topology model that records the topological structure of several power nodes and transmission lines of the power system; determining the power flow transfer entropy of each transmission line according to the network topology model, and calculating the line importance index of each transmission line according to the power flow transfer entropy; calculating the node weight of the power nodes connected to each transmission line according to the line importance index; calculating the clustering coefficient of each power node according to the network topology model; calculating the node importance index of each power node according to the node weight and the clustering coefficient; calculating the invulnerability score of the power system according to the node importance index and the line importance index. It can be understood that the present invention determines the importance of the transmission line according to the impact of the transmission line failure on other lines, determines the importance of the power node according to the clustering coefficient of the power node itself, and the importance of the connected transmission line, and then accurately judges the redundancy and decentralization of the power system. It can be understood that when the power system has more components with high importance indexes, it means that the redundancy and decentralization of the power system are less and the invulnerability is lower. Therefore, the present invention can more accurately evaluate the overall invulnerability of the power system according to the component importance index.

[0117] See also Figure 2 , is a schematic diagram of the structure of a power system survivability assessment device provided by an embodiment of the present invention, comprising:

[0118] A model acquisition module, used to acquire a network topology model recording a plurality of power nodes and a topological structure of a transmission line of a power system;

[0119] A line evaluation module is used to determine the power flow transfer entropy of each transmission line and calculate the line importance index of each transmission line based on the power flow transfer entropy; wherein the power flow transfer entropy is used to characterize the power flow impact on other transmission lines after a transmission line failure in the power system;

[0120] A weight calculation module, used to calculate the node weight of the power node connected to each transmission line according to the line importance index;

[0121] A coefficient calculation module, used to calculate the aggregation coefficient of each power node according to the network topology model;

[0122] A node evaluation module, used to calculate a node importance index of each power node according to the node weight and the clustering coefficient;

[0123] A network evaluation module is used to calculate the invulnerability score of the power system according to the node importance index and the line importance index.

[0124] It should be noted that the device embodiments described above are merely schematic, wherein the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the scheme of this embodiment. In addition, in the accompanying drawings of the device embodiments provided by the present invention, the connection relationship between the modules indicates that there is a communication connection between them, which may be specifically implemented as one or more communication buses or signal lines. A person of ordinary skill in the art may understand and implement it without paying any creative effort.

[0125] Those skilled in the art can clearly understand that for the sake of convenience and brevity, the specific working process of the device described above can refer to the corresponding process in the aforementioned method embodiment, and will not be repeated here.

[0126] Another preferred embodiment of the present invention provides a terminal device, including a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor, wherein when the processor executes the computer program, it implements a method for assessing the indestructibility of an electric power system as described in any one of the above embodiments.

[0127] The terminal device may be a computing device such as a desktop computer, a notebook, a PDA, a cloud server, etc. The terminal device may include, but is not limited to, a processor and a memory.

[0128] The processor may be a central processing unit (CPU), other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The general-purpose processor may be a microprocessor or any conventional processor, etc. The processor is the control center of the terminal device, and uses various interfaces and lines to connect various parts of the entire terminal device.

[0129] The memory can be used to store the computer program, and the processor realizes various functions of the terminal device by running or executing the computer program stored in the memory and calling the data stored in the memory. The memory can mainly include a program storage area and a data storage area, wherein the program storage area can store an operating system, at least one application required for a function, etc.; the data storage area can store data created according to the use of the mobile phone, etc. In addition, the memory can include a high-speed random access memory, and can also include a non-volatile memory, such as a hard disk, a memory, a plug-in hard disk, a smart memory card (Smart Media Card, SMC), a secure digital (Secure Digital, SD) card, a flash card (Flash Card), at least one disk storage device, a flash memory device, or other volatile solid-state storage devices.

[0130] Another preferred embodiment of the present invention provides a storage medium, the storage medium is a computer-readable storage medium, the computer program is stored in the computer-readable storage medium, and the computer program, when executed by the processor, can implement the steps of the above-mentioned various method embodiments. Wherein, the computer program includes computer program code, and the computer program code can be in source code form, object code form, executable file or some intermediate form, etc. The computer-readable medium may include: any entity or device capable of carrying the computer program code, recording medium, USB flash drive, mobile hard disk, magnetic disk, optical disk, computer memory, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), electrical carrier signal, telecommunication signal and software distribution medium, etc.

[0131] The above is a preferred embodiment of the present invention. It should be pointed out that a person skilled in the art can make several improvements and modifications without departing from the principle of the present invention. These improvements and modifications are also considered to be within the scope of protection of the present invention.

Claims

1. A method for evaluating the invulnerability of a power system, characterized in that: include: Obtaining a network topology model recording a plurality of power nodes and a topological structure of a transmission line of a power system; According to the network topology model, the power flow transfer entropy of each transmission line is determined, and the line importance index of each transmission line is calculated according to the power flow transfer entropy; wherein the power flow transfer entropy is used to characterize the power flow impact on other transmission lines after a failure of any transmission line in the power system; Calculating the node weight of the power node connected to each transmission line according to the line importance index; Calculating the clustering coefficient of each power node according to the network topology model; Calculating a node importance index of each power node according to the node weight and the clustering coefficient; The invulnerability score of the power system is calculated according to the node importance index and the line importance index.

2. A method for evaluating the invulnerability of a power system according to claim 1, characterized in that: Determining the power flow transfer entropy of each transmission line according to the network topology model, and calculating the line importance index of each transmission line according to the power flow transfer entropy, includes: Obtain the maximum transmission power of several transmission lines; Traversing the transmission lines in the network topology model, obtaining the initial power flow of the first transmission line currently traversed when it is operating normally, and then setting the first transmission line to be out of service due to a fault; Determine a transmission line that shares the power flow of the first transmission line as a second transmission line, and calculate the power flow transfer amount shared by the second transmission line; Calculating a transmission margin ratio of each second transmission line according to the initial power flow, the power flow transfer amount of each second transmission line, and the maximum transmission power of each second transmission line; Calculating the power flow transfer entropy of the first transmission line according to the transmission margin ratio; Calculating a line importance index of a first transmission line according to the power flow transfer entropy and the initial power flow; When the traversal is completed, a line importance index for each transmission line is generated.

3. A method for evaluating the invulnerability of a power system according to claim 2, characterized in that: Calculating the power flow transfer entropy of the first transmission line according to the transmission margin ratio includes: The power flow transfer entropy of the power system is calculated according to the following formula: Where H is the power flow transfer entropy, N is the set of the second transmission lines, γ kl is the transmission margin ratio of the kth second transmission line in N.

4. A method for evaluating the invulnerability of a power system according to claim 1, characterized in that: The calculating the clustering coefficient of each power node according to the network topology model includes: Traversing the power nodes in the network topology model, and acquiring a plurality of second power nodes connected to the currently traversed first power node; According to the network topology model, calculating the number of triangles formed by the first power node and any two second power nodes; Calculating a clustering coefficient of the first power node according to the total number of the second power nodes and the number of triangles; When the traversal is complete, the clustering coefficient of each power node is generated.

5. A method for evaluating the invulnerability of a power system as claimed in claim 4, characterized in that: The calculating the clustering coefficient of the first power node according to the total number of the second power nodes and the number of triangles includes: The clustering coefficient of the first power node is calculated by the following formula: Among them, c i is the clustering coefficient of the first power node, e i is the number of triangles formed between the first power node and any two of its second power nodes, k i is the total number of second power nodes.

6. A method for evaluating the invulnerability of a power system as claimed in claim 5, characterized in that: The calculating the invulnerability score of the power system according to the node importance index and the line importance index of the transmission line includes: Determining the edge weight of each transmission line in the network topology model according to the line importance index of the transmission line; Determine the power node connected to the transmission line whose edge weight meets the preset threshold as the target power node; Calculating a first sum of node importance indicators of the target power nodes and a second sum of node importance indicators of all power nodes; A destruction resistance score of the power system is calculated according to the first sum and the second sum.

7. A method for evaluating the invulnerability of a power system according to claim 6, characterized in that: Calculating the invulnerability score of the power system according to the first sum and the second sum, comprising: The invulnerability score of the power system is calculated by the following formula: Wherein, Z(G) is the invulnerability score of the power system, ε is the preset correction coefficient, is the second total number, P(i) is the node importance index of the i-th power node, P′(i) is the node importance index of the i-th target power node, N′ B is the set of target power nodes, N B A collection of power nodes.

8. A device for evaluating the invulnerability of a power system, characterized in that: include: A model acquisition module, used to acquire a network topology model recording a plurality of power nodes and a topological structure of a transmission line of a power system; A line evaluation module is used to determine the power flow transfer entropy of each transmission line and calculate the line importance index of each transmission line based on the power flow transfer entropy; wherein the power flow transfer entropy is used to characterize the power flow impact on other transmission lines after a transmission line failure in the power system; A weight calculation module, used to calculate the node weight of the power node connected to each transmission line according to the line importance index; A coefficient calculation module, used to calculate the aggregation coefficient of each power node according to the network topology model; A node evaluation module, used to calculate a node importance index of each power node according to the node weight and the clustering coefficient; A network evaluation module is used to calculate the invulnerability score of the power system according to the node importance index and the line importance index.

9. A terminal device, characterized in that: The method comprises a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor, wherein when the processor executes the computer program, a method for evaluating the invulnerability of an electric power system as claimed in any one of claims 1 to 7 is implemented.

10. A storage medium, characterized in that: The storage medium includes a stored computer program, wherein when the computer program is executed, the device where the storage medium is located is controlled to execute the method for assessing the invulnerability of a power system as claimed in any one of claims 1 to 7.

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