Method, system, medium and computing device for evaluating vulnerability of DC transmission-end power grid

Abstract

The present invention relates to a method, system, medium and computing device for evaluating the vulnerability of a DC sending-end power grid, which comprises: obtaining a power grid planning scheme, obtaining multiple branches in the power grid and branch information of each branch according to the power grid planning scheme; calculating a comprehensive branch vulnerability index of each branch according to the branch information of each branch; calculating a network vulnerability index according to the comprehensive branch vulnerability index, and determining the structural vulnerability of the power grid planning scheme by the network vulnerability index. The present invention can evaluate the vulnerability of different power grid planning schemes and guide power grid planning and construction. The present invention can be applied in the field of power grid planning technology.

Description

Technical Field

[0001] The present invention relates to the technical field of power grid fault assessment, and in particular to a method, system, medium and computing device suitable for assessing the network vulnerability of a DC sending-end power grid. Background Art

[0002] China's energy distribution is characterized by the reverse distribution of energy resources and load centers, which is suitable for using the large capacity and low loss characteristics of UHV DC to realize power transmission. In recent years, with the gradual commissioning of multiple UHV DC transmission lines, the power grid at the sending end has shown a series of problems in planning and operation. Among them, the connection between the AC power grid at the sending end of multiple DC circuits is not strong enough, and the transmission capacity of the AC channel running in parallel with DC is relatively insufficient, making it difficult to carry the power flow transfer after a DC fault, which has become one of the key factors restricting the DC transmission capacity.

[0003] As the focus of future energy development gradually moves westward and northward, the energy bases to be developed are mainly located in areas with weak AC power grids, which are unable to withstand large power fluctuations caused by DC faults. In addition, the development of new energy is accelerating, and the power supply structure in the DC sending-end power grid has changed significantly. In the future, the scale of supporting thermal power for new DC will be further reduced, the randomness of power flow changes in the power grid will increase, and the low anti-interference ability of new energy will increase the impact of power grid faults on the reliable operation of the system.

[0004] In order to accurately identify the weak links in the power grid during the planning stage and improve the ability of the planned grid to carry the safe and stable operation of UHV DC, it is urgent to quantitatively evaluate the network topology of different planning schemes to ensure that the proposed planning scheme has a strong power grid structure. Power system vulnerability indicators have important guiding significance for evaluating power grid structure. Existing research on power system vulnerability mostly starts from the perspective of power grid components, considering the relative vulnerability of a single power grid component, but ignoring the impact of the overall topological structure and global operating status vulnerability of the power grid on the economy and safe operation of the power grid; or the purpose of the research is to locate the weak links in the operation of the power grid, and the evaluation results are only meaningful for the research object power grid, and it is difficult to effectively compare the system vulnerability of different power grid planning schemes. Summary of the invention

[0005] In view of the above problems, the purpose of the present invention is to provide a method, system, medium and computing device for evaluating the vulnerability of a DC sending-end power grid, so as to evaluate the vulnerability of different power grid planning schemes and guide power grid planning and construction.

[0006] To achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a method for assessing the vulnerability of a DC sending-end power grid, comprising: obtaining a power grid planning scheme, and obtaining branch information of multiple branches and each branch in the power grid according to the power grid planning scheme; calculating a comprehensive branch vulnerability index of each branch according to the branch information of each branch; calculating a network vulnerability index according to the comprehensive branch vulnerability index, and determining the structural vulnerability of the power grid planning scheme according to the network vulnerability index.

[0007] Further, the branch information includes the number of nodes in the power grid, the change in transient potential energy of the branch after being disturbed, and the electrical betweenness of the branch; according to the number of nodes in the power grid, the change in transient potential energy of the branch after being disturbed, and the electrical betweenness of the branch, the comprehensive branch vulnerability index is calculated by the following formula:

[0008] T ij =ΔE ij Be ij

[0009] Where, T ij is the comprehensive branch vulnerability index of branch ij in the power grid, i and j are the node numbers in the power grid respectively; ΔE ij Be is the transient potential energy change of branch ij after being disturbed; ij is the electrical betweenness of branch ij.

[0010] Further, the method for calculating the network vulnerability index according to the comprehensive branch vulnerability index includes:

[0011] Evenly divide all comprehensive branch vulnerabilities into a number of intervals, and determine the frequency of the branch vulnerabilities falling within each interval;

[0012] According to the comprehensive branch vulnerability index and the frequency of the comprehensive branch vulnerability in all intervals, the network vulnerability index is obtained by performing entropy operation on all branch vulnerability indicators of the power grid, and its weight is the maximum value of all branch vulnerability indicators.

[0013] Furthermore, the network vulnerability index is:

[0014]

[0015] Where V is the network vulnerability, max{·} represents the maximum value operation, P(k) is the frequency of the branch vulnerability falling in the kth interval, and m is the number of intervals.

[0016] Furthermore, the method for determining the structural vulnerability of the power grid planning scheme by the network vulnerability index includes: the value of the network vulnerability index is proportional to the structural vulnerability of the power grid planning scheme.

[0017] A DC sending-end power grid vulnerability assessment system comprises: an information acquisition module, which acquires a power grid planning scheme and obtains multiple branches in the power grid and branch information of each branch according to the power grid planning scheme; a calculation module, which calculates a comprehensive branch vulnerability index of each branch according to the branch information of each branch; and a vulnerability determination module, which calculates a network vulnerability index according to the comprehensive branch vulnerability index and determines the structural vulnerability of the power grid planning scheme according to the network vulnerability index.

[0018] Furthermore, in the vulnerability determination module, calculating the network vulnerability index includes:

[0019] A division module divides all branch vulnerabilities evenly into a number of intervals and determines the frequency of the branch vulnerabilities falling within each interval;

[0020] The network vulnerability calculation module obtains the network vulnerability index according to the comprehensive branch vulnerability index and the frequency of the branch vulnerabilities in all intervals.

[0021] Furthermore, in the vulnerability determination module, the structural vulnerability of the power grid planning scheme is determined by the network vulnerability index, including: the value of the network vulnerability index is proportional to the structural vulnerability of the power grid planning scheme.

[0022] A computer-readable storage medium storing one or more programs, wherein the one or more programs include instructions, which, when executed by a computing device, cause the computing device to perform any of the above methods.

[0023] A computing device comprises: one or more processors, a memory and one or more programs, wherein the one or more programs are stored in the memory and configured to be executed by the one or more processors, and the one or more programs include instructions for executing any of the above methods.

[0024] The present invention adopts the above technical solution, which has the following advantages:

[0025] 1. The present invention can comprehensively reflect the state vulnerability and structural vulnerability of the power system, and characterize the system vulnerability from the perspective of the overall structure of the power grid rather than a single component, which provides a more comprehensive description of system characteristics.

[0026] 2. The indicators used in the present invention have horizontal comparison significance among different planning schemes and can be directly used to compare the advantages and disadvantages of different planning schemes in terms of power grid structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is an overall flow chart of a method for assessing vulnerability of a DC sending-end power grid in one embodiment of the present invention;

[0028] Figure 2 is a schematic diagram of different power grid structures in one embodiment of the present invention;

[0029] Figure 3 Schematic diagram of different distributions of branch vulnerabilities in one embodiment of the present invention. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solution and advantages of the embodiment of the present invention clearer, the technical solution of the embodiment of the present invention will be clearly and completely described below in conjunction with the drawings of the embodiment of the present invention. Obviously, the described embodiment is a part of the embodiment of the present invention, not all of the embodiments. Based on the described embodiment of the present invention, all other embodiments obtained by ordinary technicians in this field belong to the scope of protection of the present invention.

[0031] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0032] As introduced in the background technology, China's energy distribution has the characteristics of reverse distribution of energy resources and load centers, which is suitable for realizing power transmission by utilizing the large capacity and low loss characteristics of ultra-high voltage direct current. In recent years, with the gradual commissioning of multiple ultra-high voltage direct current transmission lines, the power grid at the sending end has shown a series of problems in planning and operation. Among them, the connection between the AC power grid at the sending end of multiple direct current transmission lines is not strong enough, and the power transmission capacity of the AC channel running in parallel with the direct current is relatively insufficient, which makes it difficult to carry the power flow transfer after a direct current fault, becoming one of the key factors restricting the direct current transmission capacity.

[0033] As the focus of future energy development gradually moves westward and northward, the energy bases to be developed are mainly located in areas with weak AC power grids, which are unable to withstand large power fluctuations caused by DC faults. In addition, the development of new energy is accelerating, and the power supply structure in the DC sending-end power grid has changed significantly. In the future, the scale of supporting thermal power for new DC will be further reduced, the randomness of power flow changes in the power grid will increase, and the low anti-interference ability of new energy will increase the impact of power grid faults on the reliable operation of the system.

[0034] In order to accurately identify the weak links in the power grid during the planning stage and improve the ability of the planned grid to carry the safe and stable operation of UHV DC, it is urgent to quantitatively evaluate the network topology of different planning schemes to ensure that the proposed planning scheme has a strong power grid structure. Power system vulnerability indicators have important guiding significance for evaluating power grid structure. Existing research on power system vulnerability mostly starts from the perspective of power grid components, considering the relative vulnerability of a single power grid component, but ignoring the impact of the overall topological structure and global operating status vulnerability of the power grid on the economy and safe operation of the power grid; or the purpose of the research is to locate the weak links in the operation of the power grid, and the evaluation results are only meaningful for the research object power grid, and it is difficult to effectively compare the system vulnerability of different power grid planning schemes.

[0035] In view of the above problems, since it is difficult to effectively compare the system vulnerabilities of different power grid planning schemes in the prior art, the present invention provides a method and system for evaluating the vulnerability of the DC sending-end power grid, including: obtaining a power grid planning scheme, and obtaining multiple branches in the power grid and branch information of each branch according to the power grid planning scheme; calculating the comprehensive branch vulnerability index of each branch according to the branch information of each branch; calculating the network vulnerability index according to the comprehensive branch vulnerability index, and determining the structural vulnerability of the power grid planning scheme by the network vulnerability index. The present invention can realize the evaluation of the vulnerability of different power grid planning schemes and guide the planning and construction of power grids. The above scheme is described in detail below.

[0036] In one embodiment of the present invention, a method for assessing the vulnerability of a DC power grid at a sending end is provided. Figure 1 As shown, the method comprises the following steps:

[0037] 1) Obtaining a power grid planning scheme, and obtaining multiple branches in the power grid and branch information of each branch according to the power grid planning scheme;

[0038] 2) Based on the branch information of each branch, the comprehensive branch vulnerability index of each branch is calculated;

[0039] 3) Based on the comprehensive branch vulnerability index, the network vulnerability index is calculated, and the structural vulnerability of the power grid planning scheme is determined by the network vulnerability index.

[0040] In the above step 1), the branch information includes the number of the node in the power grid, the change in transient potential energy of the branch after the disturbance, and the electrical betweenness of the branch; based on the number of the node in the power grid, the change in transient potential energy of the branch after the disturbance, and the electrical betweenness of the branch, the comprehensive branch vulnerability index is calculated.

[0041] In this embodiment, for the determined power grid planning scheme A, the comprehensive branch vulnerability index of all branches in A is calculated. The comprehensive branch vulnerability index is:

[0042] T ij =ΔE ij Be ij (1)

[0043] Where, T ij is the comprehensive branch vulnerability index of branch ij in the power grid, i and j are the node numbers in the power grid respectively; ΔE ij Be is the transient potential energy change of branch ij after being disturbed; ij is the electrical betweenness of branch ij.

[0044] Among them, ΔE ij for:

[0045]

[0046] In the formula, G ij , B ij are the conductance and susceptance of branch ij respectively; P ij , Q ij are respectively the active power and reactive power transmission of branch ij in the current operating state; U ij0 ,θ ij0 , P ij0 , Q ij0 U ij ,θ ij , P ij , Q ij The above electrical quantities all use per unit values.

[0047] The electrical intermediate number Be of branch i and j ij for:

[0048]

[0049] In the formula, I ij (m,n) is the current induced on line mn after injecting unit current between the generation node and load node pair (m,n); W m is the weight of the power generation node m, taking the rated capacity of the generator; W n is the weight of load node n, taking the peak load; G and L are the collections of all power generation and load nodes. The above electrical quantities all use per unit values.

[0050] In the above step 3), the method for calculating the network vulnerability index according to the comprehensive branch vulnerability index includes the following steps:

[0051] 3.1) All comprehensive branch vulnerabilities are evenly divided into several intervals, and the frequency of branch vulnerabilities falling within each interval is determined;

[0052] For example, all branch vulnerabilities are evenly divided into m intervals, and the frequency of branch vulnerability falling in the kth interval is P(k);

[0053] 3.2) According to the comprehensive branch vulnerability index and the frequency of the comprehensive branch vulnerability of all intervals, the network vulnerability index is obtained by performing entropy calculation on the vulnerability indicators of all branches of the power grid, and its weight is the maximum value of all branch vulnerability indicators.

[0054] For a general random event M, if its value can be divided into n intervals, and the frequency of the value falling in the lth interval is P(l), then the entropy calculation format is:

[0055]

[0056] Among them, H is the entropy of the system and c is the weight. The larger the entropy, the more evenly the values ​​of random events are distributed in each interval.

[0057] The network vulnerability indicators are:

[0058]

[0059] Where V is the network vulnerability, max{·} represents the maximum value operation, P(k) is the frequency of the branch vulnerability falling in the kth interval, and m is the number of intervals.

[0060] In the above step 3), the method of determining the structural vulnerability of the power grid planning scheme by the network vulnerability index is: the value of the network vulnerability index is proportional to the structural vulnerability of the power grid planning scheme. That is, the larger the calculated network vulnerability index is, the more vulnerable the structure of the power grid planning scheme is.

[0061] In summary, the network vulnerability index of the power grid planning scheme A obtained by calculation in the present invention can be used for quantitative comparison of grid structures between different power grid planning schemes.

[0062] like Figure 2 As shown in the figure, different grid structures are given. Generally speaking, the closer the grid connection, the stronger the network; on the other hand, it is usually required that the AC grid avoids forming a structure with weak connections between regions, otherwise it will form a typical weak link and bring hidden dangers to the safety and stability of the grid. Figure 2 The left power grid has not formed a ring network structure and is relatively weak; Figure 2 The intermediate power grid forms two areas with relatively close internal connections, and the areas are connected by a single channel, with a relatively tight structure. Figure 2 The grid structure shown on the left is more optimized, but the weak tie line between the two areas is the weak link of the system, and faults can easily cause large oscillations on the tie line; Figure 2 Multiple communication channels have been formed between the two areas of the right power grid, which can serve as backup for each other and have a relatively strong structure.

[0063] like Figure 3 As shown in Figure 2, the meaning of different distributions of branch vulnerability within the power grid is explained. Figure 3 The central point represents the vulnerability index of each component of the system. For system 1, the branch vulnerability of the components in the power grid is evenly distributed in the interval (0,5), indicating that there are different parts from weak to strong in the power grid, which are quite different from each other and have obvious weak links. For system 2, the branch vulnerability of the components in the power grid is distributed in the interval (1,4), and half of them are concentrated in the interval (2,3). If the entropy of the distribution of component vulnerability in the two systems is calculated separately, the entropy of system 1 is greater than that of system 2. Corresponding to the actual power grid, the overall structural vulnerability of system 1 is greater than that of system 2.

[0064] In one embodiment of the present invention, a DC sending-end power grid vulnerability assessment system is provided, comprising:

[0065] An information acquisition module obtains a power grid planning scheme, and obtains multiple branches in the power grid and branch information of each branch according to the power grid planning scheme;

[0066] The calculation module calculates the comprehensive branch vulnerability index of each branch according to the branch information of each branch;

[0067] The vulnerability determination module calculates the network vulnerability index based on the comprehensive branch vulnerability index, and determines the structural vulnerability of the power grid planning scheme based on the network vulnerability index.

[0068] In the above embodiment, the comprehensive branch vulnerability index is:

[0069] T ij =ΔE ij Be ij

[0070] Where, T ij is the comprehensive branch vulnerability index of branch ij in the power grid, i and j are the node numbers in the power grid respectively; ΔE ij Be is the transient potential energy change of branch ij after being disturbed; ij is the electrical betweenness of branch ij.

[0071] In the above embodiment, in the vulnerability determination module, calculating the network vulnerability index also includes:

[0072] The partitioning module evenly divides all the comprehensive branch vulnerabilities into several intervals and determines the frequency of branch vulnerabilities falling in each interval;

[0073] The network vulnerability calculation module obtains the network vulnerability index by performing entropy calculation on the vulnerability index of all branches of the power grid according to the comprehensive branch vulnerability index and the frequency of branch vulnerability in all intervals, and its weight is the maximum value of all branch vulnerability indexes.

[0074] Among them, the network vulnerability indicators are:

[0075]

[0076] Where V is the network vulnerability, max{·} represents the maximum value operation, P(k) is the frequency of the branch vulnerability falling in the kth interval, and m is the number of intervals.

[0077] In the above embodiment, in the vulnerability determination module, the structural vulnerability of the power grid planning scheme is determined by the network vulnerability index, including: the value of the network vulnerability index is proportional to the structural vulnerability of the power grid planning scheme.

[0078] The system provided in this embodiment is used to execute the above-mentioned method embodiments. Please refer to the above-mentioned embodiments for specific processes and detailed contents, which will not be repeated here.

[0079] In one embodiment of the present invention, a computing device structure is provided. The computing device may be a terminal, which may include: a processor, a communications interface, a memory, a display screen, and an input device. The processor, the communications interface, and the memory communicate with each other through a communication bus. The processor is used to provide computing and control capabilities. The memory includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and a computer program. When the computer program is executed by the processor, a method for assessing the vulnerability of a DC power grid at a DC transmission end is implemented; the internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The communication interface is used to communicate with an external terminal in a wired or wireless manner. The wireless manner may be implemented through WIFI, a management network, NFC (near field communication) or other technologies. The display screen may be a liquid crystal display screen or an electronic ink display screen. The input device may be a touch layer covered on the display screen, or a key, trackball, or touchpad provided on the housing of the computing device, or an external keyboard, touchpad, or mouse. The processor can call the logic instructions in the memory to execute the following method: obtain a power grid planning scheme, and obtain multiple branches in the power grid and branch information of each branch according to the power grid planning scheme; calculate the comprehensive branch vulnerability index of each branch according to the branch information of each branch; calculate the network vulnerability index according to the comprehensive branch vulnerability index, and determine the structural vulnerability of the power grid planning scheme according to the network vulnerability index.

[0080] In addition, the logic instructions in the above-mentioned memory can be implemented in the form of software functional units and can be stored in a computer-readable storage medium when sold or used as an independent product. Based on such an understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art or the part of the technical solution, can be embodied in the form of a software product, which is stored in a storage medium and includes several instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present invention. The aforementioned storage medium includes: various media that can store program codes, such as a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk.

[0081] Those skilled in the art will understand that the structure of the above-mentioned computing device is only a partial structure related to the scheme of the present application, and does not constitute a limitation on the computing device to which the scheme of the present application is applied. The specific computing device may include more or fewer components, or combine certain components, or have a different arrangement of components.

[0082] In one embodiment of the present invention, a computer program product is provided, the computer program product comprising a computer program stored on a non-transitory computer-readable storage medium, the computer program comprising program instructions, and when the program instructions are executed by a computer, the computer can execute the methods provided by the above-mentioned method embodiments, for example, including: obtaining a power grid planning scheme, and obtaining multiple branches in the power grid and branch information of each branch according to the power grid planning scheme; calculating a comprehensive branch vulnerability index of each branch according to the branch information of each branch; calculating a network vulnerability index according to the comprehensive branch vulnerability index, and determining the structural vulnerability of the power grid planning scheme according to the network vulnerability index.

[0083] In one embodiment of the present invention, a non-transitory computer-readable storage medium is provided, which stores server instructions, and the computer instructions enable a computer to execute the methods provided in the above embodiments, for example, including: obtaining a power grid planning scheme, and obtaining multiple branches in the power grid and branch information of each branch according to the power grid planning scheme; calculating a comprehensive branch vulnerability index of each branch according to the branch information of each branch; calculating a network vulnerability index according to the comprehensive branch vulnerability index, and determining the structural vulnerability of the power grid planning scheme according to the network vulnerability index.

[0084] The above embodiment provides a computer-readable storage medium, whose implementation principle and technical effect are similar to those of the above method embodiment, and will not be repeated here.

[0085] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0086] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0087] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 A step that specifies a function in one or more boxes.

[0088] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for assessing the vulnerability of a DC power grid at a sending end, characterized in that: include: Obtaining a power grid planning scheme, and obtaining multiple branches in the power grid and branch information of each branch according to the power grid planning scheme; Based on the branch information of each branch, the comprehensive branch vulnerability index of each branch is calculated; Calculating a network vulnerability index based on the comprehensive branch vulnerability index, and determining the structural vulnerability of the power grid planning scheme based on the network vulnerability index; The method for calculating the network vulnerability index according to the comprehensive branch vulnerability index includes: Evenly divide all comprehensive branch vulnerabilities into a number of intervals, and determine the frequency of the branch vulnerabilities falling within each interval; According to the comprehensive branch vulnerability index and the frequency of the comprehensive branch vulnerability in all intervals, a network vulnerability index is obtained by performing entropy calculation on all branch vulnerability indicators of the power grid, and its weight is the maximum value of all branch vulnerability indicators; The network vulnerability indicators are: T ij =ΔE ij Be ij Where V is the network vulnerability, max{·} represents the maximum value operation, P(k) is the frequency of branch vulnerability falling in the kth interval, m is the number of intervals, and T ij is the comprehensive branch vulnerability index of branch ij in the power grid, i and j are the node numbers in the power grid respectively; ΔE ij Be is the transient potential energy change of branch ij after being disturbed; ij is the electrical betweenness of branch ij; The method for determining the structural vulnerability of the power grid planning scheme by the network vulnerability index comprises: the value of the network vulnerability index is proportional to the structural vulnerability of the power grid planning scheme.

2. A DC sending-end power grid vulnerability assessment system, characterized in that: include: An information acquisition module obtains a power grid planning scheme, and obtains multiple branches in the power grid and branch information of each branch according to the power grid planning scheme; The calculation module calculates the comprehensive branch vulnerability index of each branch according to the branch information of each branch; A vulnerability determination module calculates a network vulnerability index according to the comprehensive branch vulnerability index, and determines the structural vulnerability of the power grid planning scheme according to the network vulnerability index; In the vulnerability determination module, calculating the network vulnerability index includes: A division module divides all branch vulnerabilities evenly into a number of intervals and determines the frequency of the branch vulnerabilities falling within each interval; A network vulnerability calculation module, which obtains the network vulnerability index according to the comprehensive branch vulnerability index and the frequency of the branch vulnerability in all intervals; The network vulnerability indicators are: T ij =ΔE ij Be ij Where V is the network vulnerability, max{·} represents the maximum value operation, P(k) is the frequency of branch vulnerability falling in the kth interval, m is the number of intervals, and T ij is the comprehensive branch vulnerability index of branch ij in the power grid, i and j are the node numbers in the power grid respectively; ΔE ij Be is the transient potential energy change of branch ij after being disturbed; ij is the electrical betweenness of branch ij; In the vulnerability determination module, the structural vulnerability of the power grid planning scheme is determined by the network vulnerability index, including: the value of the network vulnerability index is proportional to the structural vulnerability of the power grid planning scheme.

3. A computer-readable storage medium storing one or more programs, characterized in that: The one or more programs include instructions that, when executed by a computing device, cause the computing device to perform the method of claim 1 .

4. A computing device, characterized in that include: One or more processors, a memory, and one or more programs, wherein the one or more programs are stored in the memory and configured to be executed by the one or more processors, and the one or more programs include instructions for executing the method according to claim 1.

Images