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

Abstract

The invention discloses a power system survivability evaluation method and device, terminal equipment and a storage medium. The method comprises the following steps: acquiring load power of nodes, outgoing line power flow of the nodes, an incoming line node set of the nodes, influence weight of a scheme in an analytic hierarchy model for analyzing load importance on a criterion and influence weight of the criterion on a target; calculating the reliability of the load node according to the load power of the node, the outgoing line power flow and the incoming line node set; calculating the importance degree of the load node according to the influence weight in the analytic hierarchy model; and calculating the survivability index of the power system according to the reliability and importance of the load node. The invention provides the method for constructing the survivability index of the power system according to the power supply reliability of the load under the condition of considering the importance of the load, and the technical problem that the importance of the specific load and the corresponding power supply reliability are neglected when the survivability of the system is calculated in the prior art is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of network survivability assessment, and in particular to a method, device, terminal equipment and storage medium for evaluating the survivability of a power system. Background Art

[0002] The power system is a national critical infrastructure and an important pillar for the normal operation of modern society. The stability and reliability of its operation are directly related to the quality of people's lives and the development of social economy. When the key parts of the power system are damaged by extreme external factors, it may cause cascading failures and lead to the loss of the system's power supply capacity. The power system's resilience refers to the system's ability to maintain power supply under extreme conditions. It is an inherent property of the system and can indicate the system's ability to resist external damage. Therefore, the proposal of accurate and effective resilience indicators is of great significance to improving the system's resilience and ensuring the continuous power supply of important loads.

[0003] At present, the anti-destruction assessment technology of power systems is mainly based on the definition of system vulnerability based on complex network theory. Each busbar in the power system is abstracted as a node and the transmission line is abstracted as an edge to construct a system topology diagram. The topological changes of the system after being damaged by extreme events are obtained through simulation, and the integrity index of the system after damage is calculated to characterize the system vulnerability. When the power grid is damaged by extreme events, it is necessary to give priority to ensuring the continuous power supply of key loads, such as important bases, government departments, hospitals, etc. When the key parts of the power system are damaged, the system's power supply capacity for the load will be significantly reduced. Most of the existing vulnerability analysis technologies consider the structural integrity of the system after damage or the overall load loss of the system as the system vulnerability index, but rarely consider the power supply risk (power supply reliability) of important loads. Therefore, how to construct the anti-destruction index of the power system according to the load's supply guarantee capacity (power supply reliability) while taking into account the importance of the load has become an urgent problem to be solved. Summary of the invention

[0004] The present invention provides a method, apparatus, terminal device and storage medium for evaluating the invulnerability of a power system, so as to solve the technical problem that the prior art ignores the importance of specific loads and the corresponding power supply reliability when calculating the invulnerability of the system.

[0005] In order to solve the above technical problems, an embodiment of the present invention provides a method for evaluating the invulnerability of a power system, comprising:

[0006] Obtain the load power of each load node in the power system, the outgoing line flow of each node other than the load node, the incoming line node set of each node other than the generator node, the influence weight of each scheme on each criterion in the hierarchical analysis model for analyzing the importance of the load, and the influence weight of each criterion on the target in the hierarchical analysis model; wherein the hierarchical analysis model includes a target layer, a criterion layer and a scheme layer; the target of the target layer is the importance of the load node; the criterion of the criterion layer includes several criteria for evaluating the performance of the load node in different aspects; the scheme of the scheme layer is each load node in the power system;

[0007] The reliability of each load node is calculated based on the load power of each load node, the outgoing power flow of each node other than the load node, and the incoming node set of each node other than the generator node;

[0008] Calculate the importance of each load node according to the influence weight of each scheme on each criterion in the hierarchical analysis model and the influence weight of each criterion on the target in the hierarchical analysis model;

[0009] According to the reliability and importance of each load node, the invulnerability index of the power system is calculated.

[0010] As a preferred solution, the calculation formula for the reliability of the load node is:

[0011]

[0012] In the formula, R i represents the reliability of node i; p i represents the outgoing power flow of node i; p Li represents the load power of node i; represents the set of incoming nodes of node j; C represents the set of reliability of incoming nodes of node i; F(X) is a data concentration evaluation function used to characterize the concentration of data in X; X represents the set of data to be evaluated; x i Represents the i-th element in X.

[0013] As a preferred solution, the calculation formula for the importance of the load node is:

[0014]

[0015] Where W k represents the importance of the kth load node; [W A ] j represents the influence weight of the jth criterion on the target; It represents the influence weight of the k-th scheme on the j-th criterion, and the k-th scheme is the k-th load node; n represents the number of criteria.

[0016] As a preferred solution, the calculation formula of the invulnerability index of the power system is:

[0017]

[0018] Where, I represents the invulnerability index of the power system; W i Represents the importance of the i-th load node; R i represents the reliability of the i-th load node; m represents the number of load nodes.

[0019] As a preferred solution, the outgoing power flow of each node except the load node and the incoming node set of each node except the generator node are obtained, including:

[0020] Obtaining the magnitude and direction of the power flow of each line to each load node in the power system, and an undirected and unweighted topological graph of the power system;

[0021] According to the direction of the power flow of each line to each load node, the undirected and unweighted topological graph is converted into a directed and unweighted topological graph;

[0022] According to the directed unweighted topological graph, a search algorithm is used to reversely search for a path from each load node to each generator node;

[0023] For each load node, a power flow tree of the load node is generated according to the path from the load node to each generator node and the magnitude of the power flow of each line to the load node;

[0024] Integrate the power flow trees of each load node to obtain the system power flow of the power system;

[0025] According to the system power flow, the outgoing power flow of each node except the load node and the incoming node set of each node except the generator node are determined.

[0026] As a preferred solution, the weight of each solution on each criterion and the weight of each criterion on the target in the hierarchical analysis model are obtained, including:

[0027] Obtaining a criterion judgment matrix of the target for all criteria and a solution judgment matrix of each criterion for all solutions;

[0028] Calculate the influence weight of each criterion on the target in the hierarchical analysis model according to the criterion judgment matrix;

[0029] According to the scheme judgment matrix corresponding to each criterion, the influence weight of each scheme on each criterion in the hierarchical analysis model is calculated;

[0030] The calculation formula of the influence weight of the criterion on the target is:

[0031]

[0032] In the formula, [W A ] i represents the influence weight of the ith criterion on the target; a ij represents the element in the i-th row and j-th column of the criterion judgment matrix; n represents the number of criteria;

[0033] The calculation formula for the impact weight of the scheme on the criteria is:

[0034]

[0035] In the formula, represents the influence weight of the y-th scheme on the x-th criterion; Represents the element in the qth row and pth column of the solution judgment matrix of the xth criterion; m represents the number of solutions.

[0036] As a preferred solution, the criteria of the criterion layer include: social stability criteria, life safety criteria, restoration difficulty criteria, power demand level criteria and economic criteria.

[0037] Based on the above embodiment, another embodiment of the present invention provides a power system invulnerability assessment device, including: a data acquisition module, a reliability calculation module, an importance calculation module and an invulnerability index calculation module;

[0038] The data acquisition module is used to obtain the load power of each load node in the power system, the outgoing line flow of each node other than the load node, the incoming line node set of each node other than the generator node, the influence weight of each scheme on each criterion in the hierarchical analysis model for analyzing the importance of the load, and the influence weight of each criterion on the target in the hierarchical analysis model; wherein the hierarchical analysis model includes a target layer, a criterion layer and a scheme layer; the target of the target layer is the importance of the load node; the criterion of the criterion layer includes a number of criteria for evaluating the performance of the load node in different aspects; the scheme of the scheme layer is each load node in the power system;

[0039] The reliability calculation module is used to calculate the reliability of each load node according to the load power of each load node, the outgoing line flow of each node other than the load node, and the incoming line node set of each node other than the generator node;

[0040] The importance calculation module is used to calculate the importance of each load node according to the influence weight of each scheme on each criterion in the hierarchical analysis model and the influence weight of each criterion on the target in the hierarchical analysis model;

[0041] The invulnerability index calculation module is used to calculate the invulnerability index of the power system according to the reliability and importance of each load node.

[0042] Based on the above embodiments, another embodiment of the present invention provides a terminal device, which includes a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor, and when the processor executes the computer program, the power system indestructibility assessment method described in the above invention embodiment is implemented.

[0043] Based on the above embodiments, 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 the power system indestructibility assessment method described in the above invention embodiment.

[0044] Compared with the prior art, the embodiments of the present invention have the following beneficial effects:

[0045] The present invention obtains the load power of each load node in the power system, the outgoing line flow of each node other than the load node, the incoming line node set of each node other than the generator node, the influence weight of each scheme on each criterion in the hierarchical analysis model for analyzing the importance of the load, and the influence weight of each criterion on the target in the hierarchical analysis model; wherein the hierarchical analysis model includes a target layer, a criterion layer and a scheme layer; the target of the target layer is the importance of the load node; the criterion of the criterion layer includes a number of criteria for evaluating the performance of the load node in different aspects; the scheme of the scheme layer is each load node in the power system; according to the load power of each load node, the outgoing line flow of each node other than the load node, and the incoming line node set of each node other than the generator node, the reliability of each load node is calculated; according to the influence weight of each scheme on each criterion in the hierarchical analysis model and the influence weight of each criterion on the target in the hierarchical analysis model, the importance of each load node is calculated; according to the reliability and importance of each load node, the invulnerability index of the power system is calculated. The present invention calculates the reliability of load nodes through node power and flow; calculates the importance of nodes through hierarchical classification models; and calculates the invulnerability index of the power system based on the importance and reliability of the load nodes. The present invention provides a method for constructing the invulnerability index of the power system based on the load power supply reliability while taking into account the importance of the load, solving the technical problem that the prior art ignores the importance of specific loads and the corresponding power supply reliability when calculating the invulnerability of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] Figure 1 It is a flowchart of a method for evaluating the invulnerability of a power system provided by an embodiment of the present invention;

[0047] Figure 2 It is a schematic diagram of the power flow tree structure of a load node in the power system;

[0048] Figure 3 It is a structural schematic diagram of a power system survivability assessment device provided by one embodiment of the present invention. DETAILED DESCRIPTION

[0049] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. 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.

[0050] Embodiment 1

[0051] Please refer to 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:

[0052] S1. Obtain the load power of each load node in the power system, the outgoing line flow of each node other than the load node, the incoming line node set of each node other than the generator node, the influence weight of each scheme on each criterion in the hierarchical analysis model used to analyze the importance of the load, and the influence weight of each criterion on the target in the hierarchical analysis model; wherein the hierarchical analysis model includes a target layer, a criterion layer and a scheme layer; the target of the target layer is the importance of the load node; the criteria of the criterion layer include several criteria for evaluating the performance of the load node in different aspects; the scheme of the scheme layer is each load node in the power system.

[0053] In a preferred embodiment, obtaining the outgoing power flow of each node except the load node and the incoming node set of each node except the generator node includes:

[0054] Obtaining the magnitude and direction of the power flow of each line to each load node in the power system, and an undirected and unweighted topological graph of the power system;

[0055] According to the direction of the power flow of each line to each load node, the undirected and unweighted topological graph is converted into a directed and unweighted topological graph;

[0056] According to the directed unweighted topological graph, a search algorithm is used to reversely search for a path from each load node to each generator node;

[0057] For each load node, a power flow tree of the load node is generated according to the path from the load node to each generator node and the magnitude of the power flow of each line to the load node;

[0058] Integrate the power flow trees of each load node to obtain the system power flow of the power system;

[0059] According to the system power flow, the outgoing power flow of each node except the load node and the incoming node set of each node except the generator node are determined.

[0060] In this embodiment, for each load node, the magnitude and direction of the flow of each line to the load node are determined by the flow tracking method. The direction of the line in the undirected and unweighted topological graph of the power system is set as the flow direction, and the undirected and unweighted topological graph is converted into a directed and unweighted topological graph. Then, for each load node, the path from the load node to each generator node is searched in the reverse direction of the line direction by a search algorithm starting from the load node. According to the path and the flow magnitude of each line to the load node, the flow tree of the load node is generated, such as Figure 2 As shown in Figure 1, it is a schematic diagram of the power flow tree structure of a load node in the power system. Figure 2 Only the flow direction is indicated, but not the flow size. The weight of the edge in the load node flow tree is set to the flow size. By integrating the flow trees of all load nodes, the system flow topology of the entire power system can be obtained. According to the system flow topology, the outgoing flow of each node except the load node and the incoming node set of each node except the generator node can be determined.

[0061] It should be noted that the search algorithm used is a breadth-first search algorithm.

[0062] In a preferred embodiment, the criteria of the criterion layer include: social stability criterion, life safety criterion, restoration difficulty criterion, power demand level criterion and economic criterion.

[0063] In this embodiment, a hierarchical analysis model is constructed to calculate the importance of each load node. The target layer is the load importance, the criterion layer is social stability, life safety, restoration difficulty, power demand level, and economy, and the solution layer is all loads in the power system. The number of loads in the system is recorded as m.

[0064] According to the expert scoring comparison, the importance of each criterion to the target layer and the importance of each scheme to the criterion layer are determined, and the criterion judgment matrix A of the load importance to each criterion is constructed. 5×5 , the scheme judgment matrix of each criterion for each load and

[0065] It should be noted that it is necessary to perform consistency checks on the judgment matrices determined by expert scoring and calculate their consistency indexes. The calculation formula for the consistency index is:

[0066]

[0067] In the formula, CI represents the consistency index of the judgment matrix; λ max represents the maximum eigenvalue of the judgment matrix; h represents the dimension of the judgment matrix.

[0068] According to the consistency index, the consistency ratio is further calculated. The calculation formula of the consistency ratio is:

[0069]

[0070] In the formula, CR represents the consistency ratio of the judgment matrix; RI is the random consistency index, which is a constant used in the hierarchical analysis method and is related to the order of the judgment matrix. It can be obtained by querying relevant information.

[0071] If CI<0.1, the consistency test passes; otherwise, the consistency test fails, and the importance of each criterion to the target layer and each scheme to the criterion layer is determined based on the expert re-scoring comparison, and the elements in the judgment matrix are modified.

[0072] In a preferred embodiment, obtaining the influence weight of each scheme on each criterion and the influence weight of each criterion on the target in the hierarchical analysis model includes:

[0073] Obtaining a criterion judgment matrix of the target for all criteria and a solution judgment matrix of each criterion for all solutions;

[0074] Calculate the influence weight of each criterion on the target in the hierarchical analysis model according to the criterion judgment matrix;

[0075] According to the scheme judgment matrix corresponding to each criterion, the influence weight of each scheme on each criterion in the hierarchical analysis model is calculated;

[0076] The calculation formula of the influence weight of the criterion on the target is:

[0077]

[0078] In the formula, [W A ] i represents the influence weight of the ith criterion on the target; a ij represents the element in the i-th row and j-th column of the criterion judgment matrix; n represents the number of criteria;

[0079] The calculation formula for the impact weight of the scheme on the criteria is:

[0080]

[0081] In the formula, It represents the influence weight of the y-th option on the x-th criterion; Represents the element in the qth row and pth column of the solution judgment matrix of the xth criterion; m represents the number of solutions.

[0082] In this embodiment, for the criterion judgment matrix A, the elements in each row vector are multiplied to obtain a new vector, each element in the row vector is raised to the fifth power, and then normalized to obtain a five-dimensional weight vector W A Similarly, the solution judgment matrix B can be x Calculate the m-dimensional weight vector, x=1,2,...,5.

[0083] S2. Calculate the reliability of each load node based on the load power of each load node, the outgoing power flow of each node other than the load node, and the incoming node set of each node other than the generator node.

[0084] In a preferred embodiment, the calculation formula of the reliability of the load node is:

[0085]

[0086] In the formula, R i represents the reliability of node i; p i represents the outgoing power flow of node i; p Li represents the load power of node i; represents the set of incoming nodes of node j; C represents the set of reliability of incoming nodes of node i; F(X) is a data concentration evaluation function used to characterize the concentration of data in X; X represents the set of data to be evaluated; x i Represents the i-th element in X.

[0087] In this embodiment, a data concentration evaluation function is used to calculate the power supply reliability of each load node.

[0088] It should be noted that the data concentration evaluation function used in the present invention is based on the definition of the Herfindahl-Hirschman index. The value range of F(X) is [0,1], which can characterize the degree of concentration of data in the data set. The larger the F(X), the more concentrated the data; the smaller the F(X), the more dispersed the data.

[0089] R i The calculation formula shows that if node i is a generator node, its reliability is the power it generates; if node i is a load node, its reliability is the product of the load power and the concentration of the incoming node reliability; if node i is any other node, its reliability is the product of the outgoing power flow and the concentration of the incoming node reliability. i The larger the value, the more centralized the power supply of node i is and the lower the reliability is. i The smaller it is, the more decentralized the power supply of node i is and the higher the reliability is.

[0090] The node reliability can be calculated layer by layer through the power flow tree of the load node, starting from the leaf node (generator node) to the root node (load node), and finally the load node reliability can be obtained.

[0091] S3. Calculate the importance of each load node according to the influence weight of each scheme on each criterion in the hierarchical analysis model and the influence weight of each criterion on the target in the hierarchical analysis model.

[0092] In a preferred embodiment, the calculation formula of the importance of the load node is:

[0093]

[0094] Where W krepresents the importance of the kth load node; [W A ] j represents the influence weight of the jth criterion on the target; It represents the influence weight of the k-th scheme on the j-th criterion. The k-th scheme is the k-th load node. n represents the number of criteria.

[0095] S4. Calculate the invulnerability index of the power system according to the reliability and importance of each load node.

[0096] In a preferred embodiment, the calculation formula of the invulnerability index of the power system is:

[0097]

[0098] Where, I represents the invulnerability index of the power system; W i Represents the importance of the i-th load node; R i represents the reliability of the i-th load node; m represents the number of load nodes.

[0099] It should be noted that the smaller the invulnerability index I is, the more dispersed the load power supply is, the higher the reliability of important loads is, and the stronger the system invulnerability is; the larger the invulnerability index I is, the more concentrated the load power supply is, the lower the reliability of important loads is, and the weaker the system invulnerability is.

[0100] Embodiment 2

[0101] Please refer to Figure 2 , is a schematic diagram of the structure of a power system invulnerability assessment device provided by an embodiment of the present invention, comprising: a data acquisition module, a reliability calculation module, an importance calculation module and an invulnerability index calculation module;

[0102] The data acquisition module is used to obtain the load power of each load node in the power system, the outgoing line flow of each node other than the load node, the incoming line node set of each node other than the generator node, the influence weight of each scheme on each criterion in the hierarchical analysis model for analyzing the importance of the load, and the influence weight of each criterion on the target in the hierarchical analysis model; wherein the hierarchical analysis model includes a target layer, a criterion layer and a scheme layer; the target of the target layer is the importance of the load node; the criterion of the criterion layer includes a number of criteria for evaluating the performance of the load node in different aspects; the scheme of the scheme layer is each load node in the power system;

[0103] The reliability calculation module is used to calculate the reliability of each load node according to the load power of each load node, the outgoing line flow of each node other than the load node, and the incoming line node set of each node other than the generator node;

[0104] The importance calculation module is used to calculate the importance of each load node according to the influence weight of each scheme on each criterion in the hierarchical analysis model and the influence weight of each criterion on the target in the hierarchical analysis model;

[0105] The invulnerability index calculation module is used to calculate the invulnerability index of the power system according to the reliability and importance of each load node.

[0106] Embodiment 3

[0107] Accordingly, an embodiment of the present invention provides a terminal device, which includes a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor, and when the processor executes the computer program, it implements the power system indestructibility assessment method described in the above-mentioned embodiment of the invention.

[0108] Embodiment 4

[0109] Accordingly, an 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 the power system invulnerability assessment method described in the above-mentioned embodiment of the invention.

[0110] 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.

[0111] 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.

[0112] 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.

[0113] The processor may be a central processing unit (CPU), or 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. A general-purpose processor may be a microprocessor or any conventional processor, etc. The processor is the control center of the device, and various interfaces and lines are used to connect various parts of the entire device.

[0114] The memory can be used to store the computer program, and the processor realizes various functions of the 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 (FlashCard), at least one disk storage device, a flash memory device, or other volatile solid-state storage devices.

[0115] The storage medium is a storage medium, and the computer program is stored in the storage medium. When the computer program is executed by the processor, the steps of each method embodiment described above can be implemented. Among them, 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, disk, optical disk, computer memory, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), electric carrier signal, telecommunication signal and software distribution medium, etc. It should be noted that the content contained in the computer readable medium can be appropriately increased or decreased according to the requirements of legislation and patent practice in the jurisdiction. For example, in some jurisdictions, according to legislation and patent practice, computer readable media do not include electric carrier signals and telecommunication signals.

[0116] 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: Obtain the load power of each load node in the power system, the outgoing line flow of each node other than the load node, the incoming line node set of each node other than the generator node, the influence weight of each scheme on each criterion in the hierarchical analysis model for analyzing the importance of the load, and the influence weight of each criterion on the target in the hierarchical analysis model; wherein the hierarchical analysis model includes a target layer, a criterion layer and a scheme layer; the target of the target layer is the importance of the load node; the criterion of the criterion layer includes several criteria for evaluating the performance of the load node in different aspects; the scheme of the scheme layer is each load node in the power system; The reliability of each load node is calculated based on the load power of each load node, the outgoing power flow of each node other than the load node, and the incoming node set of each node other than the generator node; Calculate the importance of each load node according to the influence weight of each scheme on each criterion in the hierarchical analysis model and the influence weight of each criterion on the target in the hierarchical analysis model; According to the reliability and importance of each load node, the invulnerability index of the power system is calculated.

2. The method for evaluating the invulnerability of a power system according to claim 1, wherein: The calculation formula of the reliability of the load node is: In the formula, R i represents the reliability of node i; p i represents the outgoing power flow of node i; p Li represents the load power of node i; represents the set of incoming nodes of node j; C represents the set of reliability of incoming nodes of node i; F(X) is a data concentration evaluation function used to characterize the concentration of data in X; X represents the set of data to be evaluated; x i Represents the i-th element in X.

3. The method for evaluating the invulnerability of a power system according to claim 1, wherein: The calculation formula of the importance of the load node is: Where W k represents the importance of the kth load node; [W A ] j represents the influence weight of the jth criterion on the target; It represents the influence weight of the k-th scheme on the j-th criterion, and the k-th scheme is the k-th load node; n represents the number of criteria.

4. The method for evaluating the invulnerability of a power system according to claim 1, wherein: The calculation formula of the invulnerability index of the power system is: Where, I represents the invulnerability index of the power system; W i Represents the importance of the i-th load node; R i represents the reliability of the i-th load node; m represents the number of load nodes.

5. The method for evaluating the invulnerability of a power system according to claim 1, wherein: Obtain the outgoing power flow of each node except the load node and the incoming node set of each node except the generator node, including: Obtaining the magnitude and direction of the power flow of each line to each load node in the power system, and an undirected and unweighted topological graph of the power system; According to the direction of the power flow of each line to each load node, the undirected and unweighted topological graph is converted into a directed and unweighted topological graph; According to the directed unweighted topological graph, a search algorithm is used to reversely search for a path from each load node to each generator node; For each load node, a power flow tree of the load node is generated according to the path from the load node to each generator node and the magnitude of the power flow of each line to the load node; Integrate the power flow trees of each load node to obtain the system power flow of the power system; According to the system power flow, the outgoing power flow of each node except the load node and the incoming node set of each node except the generator node are determined.

6. The method for evaluating the invulnerability of a power system according to claim 1, wherein: Obtain the influence weight of each scheme on each criterion and the influence weight of each criterion on the target in the hierarchical analysis model, including: Obtaining a criterion judgment matrix of the target for all criteria and a solution judgment matrix of each criterion for all solutions; According to the criterion judgment matrix, the influence weight of each criterion in the hierarchical analysis model on the target is calculated; According to the scheme judgment matrix corresponding to each criterion, the influence weight of each scheme on each criterion in the hierarchical analysis model is calculated; The calculation formula of the influence weight of the criterion on the target is: In the formula, [W A ] i represents the influence weight of the ith criterion on the target; a ij represents the element in the i-th row and j-th column of the criterion judgment matrix; n represents the number of criteria; The calculation formula for the impact weight of the scheme on the criteria is: In the formula, represents the influence weight of the y-th scheme on the x-th criterion; Represents the element in the qth row and pth column of the solution judgment matrix of the xth criterion; m represents the number of solutions.

7. The method for evaluating the invulnerability of a power system according to claim 1, wherein: The criteria of the criterion layer include: social stability criteria, life safety criteria, restoration difficulty criteria, power demand level criteria and economic criteria.

8. A power system invulnerability assessment device, characterized in that: include: Data acquisition module, reliability calculation module, importance calculation module and invulnerability index calculation module; The data acquisition module is used to obtain the load power of each load node in the power system, the outgoing line flow of each node other than the load node, the incoming line node set of each node other than the generator node, the influence weight of each scheme on each criterion in the hierarchical analysis model for analyzing the importance of the load, and the influence weight of each criterion on the target in the hierarchical analysis model; wherein the hierarchical analysis model includes a target layer, a criterion layer and a scheme layer; the target of the target layer is the importance of the load node; the criterion of the criterion layer includes a number of criteria for evaluating the performance of the load node in different aspects; the scheme of the scheme layer is each load node in the power system; The reliability calculation module is used to calculate the reliability of each load node according to the load power of each load node, the outgoing line flow of each node other than the load node, and the incoming line node set of each node other than the generator node; The importance calculation module is used to calculate the importance of each load node according to the influence weight of each scheme on each criterion in the hierarchical analysis model and the influence weight of each criterion on the target in the hierarchical analysis model; The invulnerability index calculation module is used to calculate the invulnerability index of the power system according to the reliability and importance of each load node.

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 the processor implements the power system invulnerability assessment method as claimed in any one of claims 1 to 7 when executing the computer program.

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 power system invulnerability assessment method according to any one of claims 1 to 7.

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