Calculation method of power grid transmission capacity considering multiple fault risks in disaster scenarios

Abstract

This invention discloses a method for calculating the power grid transmission capacity considering multiple fault risks under disaster scenarios. The method includes generating a candidate fault set for transmission sections under the current operating mode and considering disaster scenarios; performing time-domain simulation calculations to obtain the transient safety and stability quantitative assessment results for each transmission section; selecting associated fault sets for each transmission section from the candidate fault set; classifying each transmission section into different tiers; performing simulations based on the associated fault sets of each transmission section to obtain information on the units experiencing fault losses and their load information; evaluating the comprehensive benefits of each tier; obtaining the power value corresponding to the maximum comprehensive benefit, which is the maximum transmission power of the transmission section under the current operating mode; and evaluating the power grid transmission capacity based on the maximum transmission power. This invention comprehensively considers uncertain faults and their risks under disaster scenarios, effectively improving economic efficiency while ensuring power grid safety.

Description

Technical Field

[0001] This invention relates to a method for calculating the power transmission capacity of a power grid that takes into account the risk of multiple faults in disaster scenarios, and belongs to the field of power system dispatching, operation and control technology. Background Technology

[0002] In disaster scenarios, multiple severe faults can easily occur, such as simultaneous tripping of multiple lines and rapid successive tripping of multiple devices due to coupling effects, posing a significant threat to the safe operation of large AC / DC hybrid power grids. Conventional methods for calculating cross-sectional transmission capacity are based on deterministic operating modes and anticipated faults, employing a slicing and grading approach for safety and stability assessment. Due to the uncertainty of disasters and their induced power grid faults, the calculation of cross-sectional transmission capacity cannot account for the costs of low-probability, high-risk faults. Therefore, there is an urgent need to extend safety and stability analysis based on deterministic criteria to power grid operation risk assessment. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to overcome the defects of the prior art and provide a method for calculating the power grid transmission capacity that takes into account the risk of multiple faults in disaster scenarios. This method comprehensively considers the uncertain faults and their risks in disaster scenarios, and can effectively improve the economy while ensuring the safety of the power grid.

[0004] To achieve the above objectives, in a first aspect, the present invention provides a method for calculating the power grid transmission capacity considering multiple fault risks under disaster scenarios, comprising the following steps:

[0005] Based on the spatiotemporal development path of disasters and the coupling relationship between disasters, considering the electrical coupling relationship between dense-level channels, cross-spanning lines and parallel lines on the same pole, a set of candidate faults for transmission sections considering disaster scenarios under the current operating mode is generated.

[0006] Time-domain simulation calculations were performed on the candidate fault set of the transmission section to obtain the transient safety and stability quantitative assessment results of each transmission section;

[0007] Based on the quantitative assessment results of transient safety and stability of each transmission section, the associated fault set of each transmission section is selected from the candidate fault set of the transmission section.

[0008] Based on the power value, each transmission section is divided into categories, and simulation is performed in combination with the associated fault set of each transmission section to obtain information on the units with fault losses and their load information.

[0009] The comprehensive benefits of each level are evaluated, and the power value corresponding to the maximum comprehensive benefit is obtained, which is the maximum transmission power of the transmission section under the current operating mode. The transmission capacity of the power grid is evaluated based on the maximum transmission power.

[0010] Furthermore, the candidate fault set of the transmission section considering disaster scenarios under the current operating mode includes the current topology information of the power grid, the output information of the generating units, the load power information, and the transmission power information of the lines.

[0011] Furthermore, the transient safety and stability quantitative evaluation results include transient power angle stability quantitative information, transient voltage stability quantitative information, and transient frequency stability quantitative information;

[0012] The transient power angle stability quantification information includes generator grouping information, as well as its margin and swing frequency information;

[0013] The transient voltage stability quantification information includes the transient voltage safety and stability monitoring bus and its margin information;

[0014] The transient frequency stability quantification information includes transient frequency safety monitoring bus, generator and its margin information.

[0015] Furthermore, based on the transient safety and stability quantitative assessment results of each transmission section, the associated fault set of each transmission section is selected from the candidate fault set of the transmission section, including:

[0016] Based on transient power angle stability quantification information, critical group units under fault conditions are screened out, active power of critical group units and active power sensitivity of transmission sections are calculated, and the sensitivity of critical group units and transmission sections under fault conditions is obtained. If the sensitivity is greater than the threshold, the fault is added to the associated fault set of the corresponding transmission section.

[0017] Based on transient voltage stability quantification information and voltage mode analysis results, weak buses and sensitive loads of faults are identified, active power of sensitive loads and active power sensitivity of transmission sections are calculated, and the sensitivity of sensitive loads and transmission sections under faults is obtained. If the sensitivity is greater than the threshold, the fault is added to the associated fault set of the corresponding transmission section.

[0018] Based on transient frequency stability quantization information, weak busbars under fault conditions are screened out. The electrical distances between the weak busbars and the first and last ends of the components of the transmission section are calculated respectively. The minimum of the two is taken as the electrical distance between the weak busbars and the components of the transmission section. If the minimum is less than the set threshold, the fault is added to the associated fault set of the transmission section.

[0019] Furthermore, the sensitivity of obtaining the critical group of generating units and transmission sections under fault conditions includes:

[0020]

[0021] Among them, S a，j，i The sensitivity of the critical group of generating units and transmission section i under fault j; K G S represents the number of critical group units under fault j;a，j，k，i The active power of critical group unit k and the active power sensitivity of transmission section i under fault j.

[0022] Furthermore, the acquisition of the sensitivity of sensitive loads and transmission sections under fault conditions includes:

[0023]

[0024] Among them, S v.j.i The sensitivity of the sensitive load and transmission section i under fault j; K L S represents the number of sensitive loads under fault j; v.j.k.i Let be the active power of the sensitive load k under fault j and the active power sensitivity of the transmission section i.

[0025] Furthermore, the classification of each transmission section based on its cross-sectional power value includes:

[0026] For each transmission section, based on the upper and lower limits of the search and the calculation accuracy, the transmission sections are classified according to power:

[0027]

[0028] Where, N i P represents the tap position of the i-th transmission section; i.max P represents the upper limit of the search for the i-th transmission section; i.min ΔP represents the lower limit of the search for the i-th transmission section; ΔP represents the calculation accuracy. This is a rounding up operation.

[0029] Furthermore, the simulation based on the associated fault sets of each transmission section includes:

[0030] Based on control measures including security control and the third line of defense, as well as the associated fault set of each transmission section, a parallel computing platform is used to simulate each level.

[0031] Furthermore, the overall benefits of each assessment level include:

[0032] H(P) = E(P) - R(P);

[0033] Where II(p) is the overall benefit when the cross-sectional transmission power is P; E(P) is the benefit when the cross-sectional transmission power is P; and R(P) is the risk when the cross-sectional transmission power is P.

[0034] Furthermore, the method for obtaining R(P) includes:

[0035]

[0036] Where, p j For fault set Fi The probability of fault j occurring; k G.m For the on-grid electricity price of unit m; P G.m P represents the steady-state active power before the occurrence of fault j in unit m; G ' .m.j The new steady-state active power after unit m fails j; t G.m.j k is the time elapsed from the occurrence of fault j in unit m to the new steady-state fault state; L.n The purchase price of electricity for load n; P L.n P represents the steady-state active power before load n fails j; L ' .n.j The new steady-state active power after load n fails j; t L.n.j Let n be the time it takes for load n to transition from the occurrence of fault j to a new steady-state fault state.

[0037] Secondly, the present invention provides a power grid transmission capacity calculation device that takes into account the risk of multiple faults in disaster scenarios, the device comprising:

[0038] The transmission section candidate fault set generation module is used to generate a transmission section candidate fault set considering disaster scenarios under the current operating mode by combining the spatiotemporal development path of disasters and the coupling relationship between disasters, dense channels, crossings, and electrical coupling relationships between lines on the same pole.

[0039] The transient safety and stability quantitative assessment module is used to perform time-domain simulation calculations on the candidate fault set of the transmission section and obtain the transient safety and stability quantitative assessment results of each transmission section.

[0040] The transmission section fault set association module is used to combine the transient safety and stability quantitative assessment results of each transmission section to select the associated fault set of each transmission section from the candidate fault set of the transmission section.

[0041] The transmission section grading simulation module is used to grade each transmission section based on the section power value, and to perform simulation by combining the associated fault set of each transmission section to obtain information on the fault-damaged units and their load information.

[0042] The transmission capacity assessment module is used to evaluate the comprehensive benefits of each level, obtain the power value corresponding to the maximum value of the comprehensive benefits, and use it as the maximum transmission power of the transmission section under the current operating mode to evaluate the transmission capacity of the power grid.

[0043] Thirdly, the present invention provides an electronic device, including a processor and a storage medium;

[0044] The storage medium is used to store instructions;

[0045] The processor is configured to operate according to the instructions to perform the steps of the method according to any one of the first aspects.

[0046] Fourthly, the present invention provides a storage medium having a computer program stored thereon, which, when executed by a processor, implements the steps of the method described in any of the first aspects.

[0047] The beneficial effects achieved by this invention are as follows:

[0048] This invention provides a method for calculating the power grid transmission capacity considering multiple fault risks in disaster scenarios. It improves upon existing methods that pre-set fault sets to calculate power grid transmission capacity by performing simulation calculations after pre-setting candidate fault sets, evaluating the transient safety and stability results of each transmission section, assigning associated fault sets to each transmission section, and calculating comprehensive benefits based on the fault sets. The maximum transmission power of the transmission section under the current operating mode is obtained from the comprehensive benefit information and used to calculate the power grid transmission capacity. This invention comprehensively considers uncertain faults and their risks in disaster scenarios, improving economic efficiency while ensuring power grid safety. Attached Figure Description

[0049] Figure 1 This is a flowchart of a method for calculating power grid transmission capacity considering multiple fault risks in disaster scenarios, provided by an embodiment of the present invention. Detailed Implementation

[0050] The present invention will be further described below in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present invention and are not intended to limit the scope of protection of the present invention.

[0051] Example 1:

[0052] The embodiments of the present invention provide a method for calculating the power grid transmission capacity considering multiple fault risks in disaster scenarios. This method improves upon the existing method of calculating the power grid transmission capacity by pre-setting fault sets. After setting a candidate fault set, the method performs simulation calculations to evaluate the transient safety and stability results of each transmission section, assigns associated fault sets to each transmission section, and calculates the comprehensive benefits based on the fault sets. The maximum transmission power of the transmission section under the current operating mode is obtained using the comprehensive benefit information to calculate the power grid transmission capacity. The present invention comprehensively considers uncertain faults and their risks in disaster scenarios, improving economic efficiency while ensuring power grid safety.

[0053] In the specific design, such as Figure 1 As shown, it includes the following steps:

[0054] Step 1: Generate the selected fault set F for transmission sections considering disaster scenarios under the current operating mode:

[0055] Combining the spatiotemporal development path of external disasters and the coupling relationship between disasters, and considering the electrical coupling relationship between dense-level channels and crossings and parallel lines on the same pole, a candidate fault set F for transmission sections considering disaster scenarios under the current operating mode is generated;

[0056] When generating the candidate fault set for the transmission section, one can refer to the invention patent with patent number CN202010160075.1 entitled "A method, system and storage medium for generating a set of anticipated faults".

[0057] The candidate fault set for transmission sections under the current operating mode and considering disaster scenarios in this patent includes current power grid topology information, unit output information, load power information, and line transmission power information.

[0058] Step 2: Perform time-domain simulation calculations on the current operating mode for the fault set F to obtain the transient safety and stability quantitative evaluation results:

[0059] Time-domain simulation calculations were performed on the candidate fault set of the transmission section to obtain the transient safety and stability quantitative assessment results of each transmission section. The transient safety and stability quantitative assessment results include transient power angle stability quantitative information, transient voltage stability quantitative information, and transient frequency stability quantitative information. Among them, the transient power angle stability quantitative information includes generator grouping information, its margin, and swing frequency information; the transient voltage stability quantitative information includes the transient voltage safety and stability monitoring bus and its margin information; and the transient frequency stability quantitative information includes the transient frequency safety monitoring bus, generators, and their margin information.

[0060] Step 3: Based on the transient safety and stability characteristic assessment results of each transmission section, select the associated fault set Fi of the i-th transmission section Si from the fault set F:

[0061] Step 3.1: Based on the transient power angle stability quantification information in the transient safety and stability characteristics in Step 2, select the critical group units under fault j, and calculate the active power sensitivity S of the critical group unit k and the transmission section i. a.j.k.i According to formula (1), the sensitivity S of the critical group of units and transmission section i under fault j is obtained. a.j.i If S a.j.i If the value exceeds the set threshold, then fault j is added to the associated fault set F of transmission section i. i In the formula, K G The number of critical group units under fault j;

[0062]

[0063] Step 3.2: Based on the transient voltage stability quantification information from the transient safety and stability characteristics in Step 2, and based on the voltage mode analysis results, identify the weak bus and its sensitive load under fault j, and calculate the active power of load k and the active power sensitivity S of transmission section i.v.j.k.i According to formula (2), the sensitivity S of the sensitive load and transmission section i under fault j is obtained. v.j.i If S v.j.i If the value exceeds the set threshold, then fault j is added to the associated fault set F of transmission section i. i In the formula, K L The number of sensitive loads under fault j;

[0064]

[0065] Step 3.3: Based on the transient frequency stability quantification information in the transient safety and stability characteristics in Step 2, the weak busbar under fault j is screened out, and the electrical distance x between the weak busbar k and the beginning and end of the equipment l of the transmission section i is calculated respectively. j.k.i.l_i x j.k.i.l_j Take min(x) j.k.i.l_i ,x j.k.i.l_j The electrical distance x between the weak busbar k and the component equipment l of the transmission section i j.k.i.l ,Pick The electrical distance x between the weak busbar k and the transmission section i j.k.i If x j.k.i If the value is less than the set threshold, then fault j is added to the associated fault set F of transmission section i. i .

[0066] Step 4: Considering security control, third line of defense, and other control measures, as well as fault set Fi, divide the transmission section Si into power tiers, and perform simulation calculations for each tier to obtain information such as fault-affected generating units and loads.

[0067] For transmission section S i According to the upper limit of search P i.max Lower limit P i.min And the calculation accuracy ΔP, classified by power File, in which symbols This indicates rounding up; utilizing a parallel computing platform, considering security control, third-line defense, and other control measures and fault set F. i The parallel computing platform is used to perform simulation calculations on each gear position to obtain information such as the unit with failure loss and the load.

[0068] Step 5: Calculate the overall revenue for each level, and take the active power of the section with the maximum overall revenue as the active power transmitted at the transmission section:

[0069] Evaluate the overall benefit H(P) = E(P) - R(P) for each tier, where E(P) is the benefit when the cross-sectional transmission power is P, and R(P) is the risk when the cross-sectional transmission power is P; calculate the transmission cross-section S. i The maximum comprehensive benefit H(P) corresponds to the P value of the transmission section S under the current method. iMaximum transmission power.

[0070] The risk R(P) when the cross-sectional transmission power is P is calculated as shown in equation (3).

[0071]

[0072] In the formula: p j For fault set F i The probability of fault j occurring; k G.m For the on-grid electricity price of unit m, P G.m P represents the steady-state active power before the occurrence of fault j in unit m. G ' .m.j The new steady-state active power value after unit m fails j is t. G.m.j k is the time elapsed from the occurrence of fault j in unit m to the new steady-state fault state; L.n For load n, the electricity purchase price, P L.n P represents the steady-state active power before load n fails j. L ' .n.j Let t be the new steady-state active power value after load n fails j. L.n.j Let n be the time it takes for load n to transition from the occurrence of fault j to a new steady-state fault state.

[0073] Example 2

[0074] Embodiment 2 of the present invention provides a power grid transmission capacity calculation device that takes into account the risk of multiple faults in disaster scenarios. The device includes:

[0075] The transmission section candidate fault set generation module is used to generate a transmission section candidate fault set considering disaster scenarios under the current operating mode by combining the spatiotemporal development path of disasters and the coupling relationship between disasters, dense channels, crossings, and electrical coupling relationships between lines on the same pole.

[0076] The transient safety and stability quantitative assessment module is used to perform time-domain simulation calculations on the candidate fault set of the transmission section and obtain the transient safety and stability quantitative assessment results of each transmission section.

[0077] The transmission section fault set association module is used to combine the transient safety and stability quantitative assessment results of each transmission section to select the associated fault set of each transmission section from the candidate fault set of the transmission section.

[0078] The transmission section grading simulation module is used to grade each transmission section based on the section power value, and to perform simulation by combining the associated fault set of each transmission section to obtain information on the fault-damaged units and their load information.

[0079] The transmission capacity assessment module is used to evaluate the comprehensive benefits of each level, obtain the power value corresponding to the maximum value of the comprehensive benefits, and use it as the maximum transmission power of the transmission section under the current operating mode to evaluate the transmission capacity of the power grid.

[0080] Example 3:

[0081] This invention provides an electronic device, including a processor and a storage medium;

[0082] The storage medium is used to store instructions;

[0083] The processor is configured to operate according to the instructions to perform the steps of the method according to any one of Embodiment 1.

[0084] Example 4:

[0085] The present invention provides a storage medium having a computer program stored thereon, which, when executed by a processor, implements the steps of the method described in any one of the embodiments.

[0086] Those skilled in the art will understand that embodiments of this application can be provided as methods, systems, or computer program products. Therefore, this application can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, this application can take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0087] This application is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of this application. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart... Figure 1 a process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0088] These computer program instructions may also be stored in a computer readable memory that can direct a computer or other programmable data processing device to work 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 The function specified in one or more boxes.

[0089] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operational steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing the instructions executed on the computer or other programmable device 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.

[0090] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A method for calculating the power transmission capacity of a power grid considering the risk of multiple faults in disaster scenarios, characterized in that: Includes the following steps: Based on the spatiotemporal development path of disasters and the coupling relationship between disasters, considering the electrical coupling relationship between dense-level channels, cross-spanning lines and parallel lines on the same pole, a set of candidate faults for transmission sections considering disaster scenarios under the current operating mode is generated. Time-domain simulation calculations were performed on the candidate fault set of the transmission section to obtain the transient safety and stability quantitative assessment results of each transmission section; Based on the quantitative assessment results of transient safety and stability of each transmission section, the associated fault set of each transmission section is selected from the candidate fault set of the transmission section. Based on the cross-sectional power value, each transmission section is classified, and simulation is performed in combination with the associated fault set of each transmission section to obtain information on the units with fault losses and their load information. The comprehensive benefits of each level are evaluated, and the power value corresponding to the maximum comprehensive benefit is obtained, which is the maximum transmission power of the transmission section under the current operating mode. The transmission capacity of the power grid is evaluated based on the maximum transmission power.

2. The method for calculating power grid transmission capacity considering multiple fault risks in disaster scenarios as described in claim 1, characterized in that: The candidate fault set for transmission sections under the current operating mode and considering disaster scenarios includes the current topology information of the power grid, the output information of generating units, the load power information, and the transmission power information of the lines.

3. The method for calculating power grid transmission capacity considering multiple fault risks in disaster scenarios as described in claim 1, characterized in that: The transient safety and stability quantitative assessment results include transient power angle stability quantitative information, transient voltage stability quantitative information, and transient frequency stability quantitative information; The transient power angle stability quantification information includes generator grouping information, its margin, and swing frequency information; the transient voltage stability quantification information includes the transient voltage safety and stability monitoring bus and its margin information; The transient frequency stability quantification information includes transient frequency safety monitoring bus, generator and its margin information.

4. The method for calculating power grid transmission capacity considering multiple fault risks in disaster scenarios according to claim 3, characterized in that: Based on the transient safety and stability quantitative assessment results of each transmission section, the associated fault set of each transmission section is selected from the candidate fault set of the transmission section, including: Based on transient power angle stability quantification information, critical group units under fault conditions are screened out, active power of critical group units and active power sensitivity of transmission sections are calculated, and the sensitivity of critical group units and transmission sections under fault conditions is obtained. If the sensitivity is greater than the threshold, the fault is added to the associated fault set of the corresponding transmission section. Based on transient voltage stability quantification information and voltage mode analysis results, weak buses and sensitive loads of faults are identified, active power of sensitive loads and active power sensitivity of transmission sections are calculated, and the sensitivity of sensitive loads and transmission sections under faults is obtained. If the sensitivity is greater than the threshold, the fault is added to the associated fault set of the corresponding transmission section. Based on transient frequency stability quantization information, weak busbars under fault conditions are screened out. The electrical distances between the weak busbars and the first and last ends of the components of the transmission section are calculated respectively. The minimum of the two is taken as the electrical distance between the weak busbars and the components of the transmission section. If the minimum is less than the set threshold, the fault is added to the associated fault set of the transmission section.

5. The method for calculating power grid transmission capacity considering multiple fault risks in disaster scenarios according to claim 4, characterized in that: The method for obtaining the sensitivity of critical group units and transmission sections under fault conditions includes: Among them, s a，j，i The sensitivity of the critical group of generating units and transmission section i under fault j; K G The number of critical group units under fault j; s a,j,k,i The active power of critical group unit k and the active power sensitivity of transmission section i under fault j.

6. The method for calculating power grid transmission capacity considering multiple fault risks in disaster scenarios according to claim 4, characterized in that: The method for obtaining the sensitivity of sensitive loads and transmission sections under fault conditions includes: Among them, S v.j.i The sensitivity of the sensitive load and transmission section i under fault j; K L S represents the number of sensitive loads under fault j; v.j.k.i Let be the active power of the sensitive load k under fault j and the active power sensitivity of the transmission section i.

7. The method for calculating power grid transmission capacity considering multiple fault risks in disaster scenarios according to claim 1, characterized in that: The classification of transmission sections based on cross-sectional power values ​​includes: For each transmission section, based on the upper and lower limits of the search and the calculation accuracy, the transmission sections are classified according to power: Where, N l P represents the tap position of the i-th transmission section; i.max P represents the upper limit of the search for the i-th transmission section; i.min ΔP represents the lower limit of the search for the i-th transmission section; ΔP represents the calculation accuracy. This is a rounding up operation.

8. The method for calculating power grid transmission capacity considering multiple fault risks in disaster scenarios according to claim 1, characterized in that: The simulation, which combines the associated fault sets of each transmission section, includes: Based on control measures including security control and the third line of defense, as well as the associated fault set of each transmission section, a parallel computing platform is used to simulate each level.

9. The method for calculating power grid transmission capacity considering multiple fault risks in disaster scenarios according to claim 1, characterized in that: The overall benefits of each assessment level include: H(P) = E(P) - R(P); Where H(P) is the overall benefit when the cross-sectional transmission power is P; E(P) is the benefit when the cross-sectional transmission power is P; and R(P) is the risk when the cross-sectional transmission power is P.

10. The method for calculating power grid transmission capacity considering multiple fault risks in disaster scenarios according to claim 9, characterized in that: The method for obtaining R(P) includes: Where, p j For fault set F i The probability of fault j occurring; k G.m For the on-grid electricity price of unit m; P G.m P represents the steady-state active power before the occurrence of fault j in unit m; G ' .m.j The new steady-state active power after unit m fails j; t G.m.j k is the time elapsed from the occurrence of fault j in unit m to the new steady-state fault state; L.n The purchase price of electricity for load n; P L.n P′ represents the steady-state active power before load n experiences fault j. L.n.j The new steady-state active power after load n fails j; t L.n.j Let n be the time it takes for load n to transition from the occurrence of fault j to a new steady-state fault state.

11. A power grid transmission capacity calculation device considering multiple fault risks in disaster scenarios, characterized in that: The device includes: The transmission section candidate fault set generation module is used to generate a transmission section candidate fault set considering disaster scenarios under the current operating mode by combining the spatiotemporal development path of disasters and the coupling relationship between disasters, dense channels, crossings, and electrical coupling relationships between lines on the same pole. The transient safety and stability quantitative assessment module is used to perform time-domain simulation calculations on the candidate fault set of the transmission section and obtain the transient safety and stability quantitative assessment results of each transmission section. The transmission section fault set association module is used to combine the transient safety and stability quantitative assessment results of each transmission section to select the associated fault set of each transmission section from the candidate fault set of the transmission section. The transmission section grading simulation module is used to grade each transmission section based on the section power value, and to perform simulation by combining the associated fault set of each transmission section to obtain information on the fault-damaged units and their load information. The transmission capacity assessment module is used to evaluate the comprehensive benefits of each level, obtain the power value corresponding to the maximum value of the comprehensive benefits, and use it as the maximum transmission power of the transmission section under the current operating mode to evaluate the transmission capacity of the power grid.

12. An electronic device, characterized in that: Including processor and storage media; The storage medium is used to store instructions; The processor is configured to operate according to the instructions to perform the steps of the method according to any one of claims 1 to 10.

13. A storage medium having a computer program stored thereon, characterized in that: When executed by a processor, the program implements the steps of the method according to any one of claims 1 to 10.

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