Method and system for calculating minimum startup of extra-high voltage direct current sending and receiving end power grid

Abstract

The invention discloses a calculation method and system for minimum startup of an extra-high voltage direct current sending and receiving end power grid, and belongs to the technical field of power system operation and control. The calculation method comprises the following steps: determining a calculation boundary of the minimum start-up amount of the extra-high-voltage direct-current transmitting-receiving end power grid according to basic information of the extra-high-voltage direct-current transmitting-receiving end power grid; within the calculation boundary, judging the minimum startup static influence to obtain a judgment result; and fault scanning is carried out based on the judgment result, and the minimum starting-up amount of the extra-high voltage direct current sending and receiving end power grid is calculated based on the scanning result. The method is simple and easy to implement and high in calculation efficiency.

Description

Technical Field

[0001] This invention relates to the field of power system operation and control technology, and more specifically, to a method for calculating the minimum start-up capacity of an ultra-high voltage direct current (UHVDC) transmission and receiving end power grid. Background Technology

[0002] In recent years, with the significant changes in the power grid structure and power source composition, the impact of AC / DC interaction on power grid security and stability has become increasingly prominent. To ensure the safe and stable operation of ultra-high-voltage direct current (UHVDC) transmission lines after commissioning, it is essential to comprehensively consider both AC and DC power transmission capacity and rationally arrange power grid operation modes. With the further expansion of new energy sources and DC transmission scale, there is an urgent need to conduct detailed and comprehensive safety and stability calculations and verifications for UHVDC transmission lines. This is crucial for fully understanding the stability characteristics of the sending and receiving end power grids after UHVDC commissioning, rationally arranging minimum operating times, and deploying effective safety and stability control measures. Summary of the Invention

[0003] To address the above problems, this invention proposes a method for calculating the minimum start-up capacity of an ultra-high voltage direct current (UHVDC) transmission and receiving end power grid, comprising:

[0004] Based on the basic information of the UHVDC transmitting and receiving end power grid, the calculation boundary of the minimum operating capacity of the UHVDC transmitting and receiving end power grid is determined;

[0005] Within the calculation boundary, the minimum static impact of startup is determined, and the determination result is obtained;

[0006] Based on the judgment results, a fault scan is performed, and based on the scan results, the minimum number of units that can be started at the UHVDC transmission and receiving end power grid is calculated.

[0007] Optional basic information includes: power generation capacity, load capacity, grid structure, scale of new energy access, load level, and DC power level.

[0008] Optionally, a minimum startup static impact assessment can be performed, including:

[0009] Determine the static influencing factors of the minimum start-up mode. Based on the static influencing factors, determine whether there are overloads or over-limit situations in the UHVDC transmission and receiving end power grids. If so, readjust the basic start-up mode; otherwise, assess the system strength.

[0010] Determine the system strength. Based on the system strength, determine whether the multi-infeed DC short-circuit ratio and multi-station multi-path ratio of the UHVDC transmitting and receiving end power grid meet the standards. If they do not meet the standards, readjust the basic start-up mode. If they meet the standards, perform static safety analysis.

[0011] Static safety analysis includes: checking fault-free components of the HVDC transmission and receiving power grid to see if there are any overloads or exceeding limits. If so, the basic start-up method is readjusted; if not, the judgment result is output.

[0012] Optionally, after readjusting the basic startup method, the calculation boundary for the minimum startup quantity can be redefined.

[0013] Optional, fault scanning, including: AC N-1 fault scanning and AC N-2 fault / DC fault scanning;

[0014] After the AC N-1 fault scan, if a fault exists, the basic power-on method is readjusted; if no fault exists, the AC N-2 fault / DC fault scan continues.

[0015] During the AC N-2 fault / DC fault scanning process, it is determined whether the UHVDC sending and receiving end grid meets the voltage stability constraint and power angle stability constraint. If both are met, it is determined whether the frequency stability constraint is met; otherwise, the minimum start-up mode is adjusted.

[0016] If the frequency stability constraint is met, the minimum number of generators required to start up at the UHVDC transmission and receiving end of the grid is calculated based on the scanning results; otherwise, the minimum start-up method is adjusted.

[0017] Optionally, after readjusting the basic startup method or the minimum startup method, the calculation boundary for the minimum startup quantity can be redefined.

[0018] Furthermore, this invention also proposes a calculation system for the minimum start-up capacity of an ultra-high voltage direct current (UHVDC) transmission and receiving end power grid, comprising:

[0019] The calculation unit is used to determine the calculation boundary of the minimum operating capacity of the UHVDC transmission and receiving end power grid based on the basic information of the UHVDC transmission and receiving end power grid.

[0020] The judgment unit is used to judge the minimum static impact of startup within the calculation boundary and obtain the judgment result;

[0021] The output unit is used to perform fault scanning based on the judgment result, and to calculate the minimum number of units to be started up in the UHVDC transmission and receiving end power grid based on the scanning result.

[0022] Optional basic information includes: power generation capacity, load capacity, grid structure, scale of new energy access, load level, and DC power level.

[0023] Optionally, a minimum startup static impact assessment can be performed, including:

[0024] Determine the static influencing factors of the minimum start-up mode. Based on the static influencing factors, determine whether there are overloads or over-limit situations in the UHVDC transmission and receiving end power grids. If so, readjust the basic start-up mode; otherwise, assess the system strength.

[0025] Determine the system strength. Based on the system strength, determine whether the multi-infeed DC short-circuit ratio and multi-station multi-path ratio of the UHVDC transmitting and receiving end power grid meet the standards. If they do not meet the standards, readjust the basic start-up mode. If they meet the standards, perform static safety analysis.

[0026] Static safety analysis includes: checking fault-free components of the HVDC transmission and receiving power grid to see if there are any overloads or exceeding limits. If so, the basic start-up method is readjusted; if not, the judgment result is output.

[0027] Optionally, after readjusting the basic startup method, the calculation boundary for the minimum startup quantity can be redefined.

[0028] Optional, fault scanning, including: AC N-1 fault scanning and AC N-2 fault / DC fault scanning;

[0029] After the AC N-1 fault scan, if a fault exists, the basic power-on method is readjusted; if no fault exists, the AC N-2 fault / DC fault scan continues.

[0030] During the AC N-2 fault / DC fault scanning process, it is determined whether the UHVDC sending and receiving end grid meets the voltage stability constraint and power angle stability constraint. If both are met, it is determined whether the frequency stability constraint is met; otherwise, the minimum start-up mode is adjusted.

[0031] If the frequency stability constraint is met, the minimum number of generators required to start up at the UHVDC transmission and receiving end of the grid is calculated based on the scanning results; otherwise, the minimum start-up method is adjusted.

[0032] Optionally, after readjusting the basic startup method or the minimum startup method, the calculation boundary for the minimum startup quantity can be redefined.

[0033] In another aspect, the present invention also provides a computing device, comprising: one or more processors;

[0034] A processor is used to execute one or more programs;

[0035] When the one or more programs are executed by the one or more processors, the method described above is implemented.

[0036] In another aspect, the present invention also provides a computer-readable storage medium having a computer program stored thereon, which, when executed, implements the method described above.

[0037] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0038] This invention provides a method for calculating the minimum operating capacity of an ultra-high voltage direct current (UHVDC) power grid at both the transmitting and receiving ends. The method includes: determining the calculation boundary of the minimum operating capacity of the UHVDC power grid based on its basic information; within the calculation boundary, assessing the static impact of the minimum operating capacity and obtaining the assessment result; performing a fault scan based on the assessment result; and calculating the minimum operating capacity of the UHVDC power grid based on the scan result. This invention is simple to implement and has high computational efficiency. Attached Figure Description

[0039] Figure 1 This is a flowchart of the method of the present invention;

[0040] Figure 2 This is a flowchart of an embodiment of the method of the present invention;

[0041] Figure 3 This is a structural diagram of the system of the present invention. Detailed Implementation

[0042] Exemplary embodiments of the invention will now be described with reference to the accompanying drawings. However, the invention may be embodied in many different forms and is not limited to the embodiments described herein. These embodiments are provided to fully and completely disclose the invention and to fully convey its scope to those skilled in the art. The terminology used in the exemplary embodiments illustrated in the drawings is not intended to limit the invention. In the drawings, the same units / elements are referred to by the same reference numerals.

[0043] Unless otherwise stated, the terms used herein (including technical terms) have their common meaning as understood by one of ordinary skill in the art. Furthermore, it is understood that terms defined in commonly used dictionaries should be understood to have a meaning consistent with the context of their relevant field, and not to be interpreted as having an idealized or overly formal meaning.

[0044] Example 1:

[0045] This invention proposes a method for calculating the minimum start-up capacity of ultra-high voltage direct current (UHVDC) transmission and receiving end power grids, such as... Figure 1 As shown, it includes:

[0046] Step 1: Based on the basic information of the UHVDC transmitting and receiving end power grid, determine the calculation boundary of the minimum operating capacity of the UHVDC transmitting and receiving end power grid;

[0047] Step 2: Within the calculation boundary, determine the minimum static impact of startup and obtain the determination result;

[0048] Step 3: Perform a fault scan based on the judgment results, and calculate the minimum number of units to be started up for the UHVDC transmission and receiving end power grid based on the scan results.

[0049] The basic information includes: installed power capacity, load capacity, grid structure, scale of new energy access, load level and DC power level.

[0050] The determination of minimum static impact upon startup includes:

[0051] Determine the static influencing factors of the minimum start-up mode. Based on the static influencing factors, determine whether there are overloads or over-limit situations in the UHVDC transmission and receiving end power grids. If so, readjust the basic start-up mode; otherwise, assess the system strength.

[0052] Determine the system strength. Based on the system strength, determine whether the multi-infeed DC short-circuit ratio and multi-station multi-path ratio of the UHVDC transmitting and receiving end power grid meet the standards. If they do not meet the standards, readjust the basic start-up mode. If they meet the standards, perform static safety analysis.

[0053] Static safety analysis includes: checking fault-free components of the HVDC transmission and receiving power grid to see if there are any overloads or exceeding limits. If so, the basic start-up method is readjusted; if not, the judgment result is output.

[0054] Among them, after readjusting the basic startup method, the calculation boundary of the minimum startup quantity is redefined.

[0055] The fault scanning includes: AC N-1 fault scanning and AC N-2 fault / DC fault scanning;

[0056] After the AC N-1 fault scan, if a fault exists, the basic power-on method is readjusted; if no fault exists, the AC N-2 fault / DC fault scan continues.

[0057] During the AC N-2 fault / DC fault scanning process, it is determined whether the UHVDC sending and receiving end grid meets the voltage stability constraint and power angle stability constraint. If both are met, it is determined whether the frequency stability constraint is met; otherwise, the minimum start-up mode is adjusted.

[0058] If the frequency stability constraint is met, the minimum number of generators required to start up at the UHVDC transmission and receiving end of the grid is calculated based on the scanning results; otherwise, the minimum start-up method is adjusted.

[0059] Among them, after readjusting the basic startup method or adjusting the minimum startup method, the calculation boundary of the minimum startup quantity is redefined.

[0060] The invention will be further explained below with reference to specific implementation examples:

[0061] Specific implementation examples Figure 2 As shown, it includes:

[0062] Step 1: Determine the calculation boundary:

[0063] The system's safety and stability level is related to multiple factors such as power generation capacity, load capacity, grid structure, scale of new energy access, load level, and DC power level. When conducting verification of the minimum start-up mode of the UHVDC transmission and receiving end grid, attention should be paid to the consistency with the calculation method of the UHVDC commissioning year.

[0064] Step 2: Static influencing factors of minimum power-on method:

[0065] After determining the calculation boundaries, the near-zone start-up mode is adjusted considering the power flow organization / dispersion capacity of the UHV transmission and receiving ends and the steady-state voltage control range of the AC lines.

[0066] Step 3: System Strength Assessment

[0067] According to GB 38755-2019 - Guidelines for Power System Safety and Stability and GB / T 40581-2021 - Specifications for Power System Safety and Stability Calculation, the short-circuit ratio of multi-infeed DC power plants and the short-circuit ratio of multi-generation power plants in the sending and receiving end systems should reach reasonable levels. Specifically, the short-circuit ratio of multi-infeed DC power plants should be greater than 3.0, and the short-circuit ratio of multi-generation power plants should also be greater than 3.0. During system strength assessment, the DC power operating level, renewable energy output, and thermal power plant start-up methods should be adjusted accordingly based on the calculation results.

[0068] Step 4: Static security analysis:

[0069] Static security analysis of power systems assumes a direct transition from the pre-disturbance static state to the post-disturbance static state, disregarding intermediate transient processes. It is used to verify whether various constraints are met after the disturbance. In a fault-free (N-1) foundation mode where a component is disconnected, line and transformer overloads and voltage exceeding operating ranges may occur, failing to meet the N-1 principle and necessitating adjustments to the foundation startup method.

[0070] Step 5: AC N-1 fault scan:

[0071] Under normal operating conditions, if a power system is subjected to a single fault disturbance as described below, the protection, switches, and reclosing devices should operate correctly without any stabilization control measures. The system should maintain stable operation and normal power supply from the grid, and other components should not exceed their specified overload capacity, with no cascading tripping. If instability occurs after an AC N-1 fault, the basic configuration should be readjusted, such as AC cross-sectional power and near-zone start-up methods.

[0072] Step 6: AC N-2 fault / DC fault scan:

[0073] Under normal operating conditions, a power system subjected to severe fault disturbances should maintain stable operation if protection systems, switches, and reclosing mechanisms operate correctly. If necessary, stabilization control measures such as generator tripping, load shedding, DC emergency power control, and pump tripping in pumped storage power stations are permitted. According to GB 38755-2019 - Guidelines for the Safety and Stability of Power Systems, calculations and analyses should be conducted on system voltage stability, power angle stability, and frequency stability. The purpose is to consider existing UHVDC stabilization measures as the boundary for system stability calculations. If system instability occurs, the minimum operating mode needs to be adjusted.

[0074] This invention can be implemented simply by following the calculation process. It is easy to implement, can significantly improve calculation efficiency, save manpower and material resources, and create significant economic benefits.

[0075] Example 2:

[0076] This invention also proposes a calculation system 200 for the minimum start-up time of an ultra-high voltage direct current (UHVDC) power grid at both the transmitting and receiving ends, such as... Figure 3 As shown, it includes:

[0077] The calculation unit 201 is used to determine the calculation boundary of the minimum operating capacity of the UHVDC power grid based on the basic information of the UHVDC power grid at the transmitting and receiving ends.

[0078] The judgment unit 202 is used to judge the minimum static impact of startup within the calculation boundary and obtain the judgment result;

[0079] The output unit 203 is used to perform fault scanning based on the judgment result, and calculate the minimum number of units to be started up in the UHVDC transmission and receiving end power grid based on the scanning result.

[0080] The basic information includes: installed power capacity, load capacity, grid structure, scale of new energy access, load level and DC power level.

[0081] The determination of minimum static impact upon startup includes:

[0082] Determine the static influencing factors of the minimum start-up mode. Based on the static influencing factors, determine whether there are overloads or over-limit situations in the UHVDC transmission and receiving end power grids. If so, readjust the basic start-up mode; otherwise, assess the system strength.

[0083] Determine the system strength. Based on the system strength, determine whether the multi-infeed DC short-circuit ratio and multi-station multi-path ratio of the UHVDC transmitting and receiving end power grid meet the standards. If they do not meet the standards, readjust the basic start-up mode. If they meet the standards, perform static safety analysis.

[0084] Static safety analysis includes: checking fault-free components of the HVDC transmission and receiving power grid to see if there are any overloads or exceeding limits. If so, the basic start-up method is readjusted; if not, the judgment result is output.

[0085] Among them, after readjusting the basic startup method, the calculation boundary of the minimum startup quantity is redefined.

[0086] The fault scanning includes: AC N-1 fault scanning and AC N-2 fault / DC fault scanning;

[0087] After the AC N-1 fault scan, if a fault exists, the basic power-on method is readjusted; if no fault exists, the AC N-2 fault / DC fault scan continues.

[0088] During the AC N-2 fault / DC fault scanning process, it is determined whether the UHVDC sending and receiving end grid meets the voltage stability constraint and power angle stability constraint. If both are met, it is determined whether the frequency stability constraint is met; otherwise, the minimum start-up mode is adjusted.

[0089] If the frequency stability constraint is met, the minimum number of generators required to start up at the UHVDC transmission and receiving end of the grid is calculated based on the scanning results; otherwise, the minimum start-up method is adjusted.

[0090] Among them, after readjusting the basic startup method or adjusting the minimum startup method, the calculation boundary of the minimum startup quantity is redefined.

[0091] The present invention is simple and easy to implement, and has high computational efficiency.

[0092] Example 3:

[0093] Based on the same inventive concept, this invention also provides a computer device, which includes a processor and a memory. The memory stores a computer program, which includes program instructions. The processor executes the program instructions stored in the computer storage medium. The processor may be a Central Processing Unit (CPU), or other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. It is the computing and control core of the terminal, suitable for implementing one or more instructions, specifically suitable for loading and executing one or more instructions in the computer storage medium to implement corresponding method flows or corresponding functions, thereby implementing the steps of the methods in the above embodiments.

[0094] Example 4:

[0095] Based on the same inventive concept, this invention also provides a storage medium, specifically a computer-readable storage medium (Memory), which is a memory device in a computer device used to store programs and data. It is understood that the computer-readable storage medium here can include both the built-in storage medium in the computer device and extended storage media supported by the computer device. The computer-readable storage medium provides storage space that stores the terminal's operating system. Furthermore, this storage space also stores one or more instructions suitable for loading and execution by a processor. These instructions can be one or more computer programs (including program code). It should be noted that the computer-readable storage medium here can be high-speed RAM or non-volatile memory, such as at least one disk storage device. The processor can load and execute one or more instructions stored in the computer-readable storage medium to implement the steps of the method in the above embodiments.

[0096] Those skilled in the art will understand that embodiments of the present invention can be provided as methods, systems, or computer program products. Therefore, the present invention can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present invention can take the form of a computer program product implemented 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. The solutions in the embodiments of the present invention can be implemented using various computer languages, such as the object-oriented programming language Java and the interpreted scripting language JavaScript.

[0097] This invention is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. 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 illustrations and / or block diagrams. Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0098] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0099] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0100] Although preferred embodiments of the invention have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including both the preferred embodiments and all changes and modifications falling within the scope of the invention.

[0101] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this invention and their equivalents, this invention also intends to include these modifications and variations.

Claims

1. A method for calculating the minimum start-up capacity of an ultra-high voltage direct current (UHVDC) transmission and receiving end power grid, characterized in that, include: Based on the basic information of the UHVDC transmitting and receiving end power grid, the calculation boundary of the minimum operating capacity of the UHVDC transmitting and receiving end power grid is determined; Within the calculation boundary, the minimum static impact of startup is determined, and the determination result is obtained; Based on the judgment results, a fault scan is performed, and based on the scan results, the minimum number of units that can be started at the UHVDC transmission and receiving end power grid is calculated.

2. The calculation method according to claim 1, characterized in that, The basic information includes: installed power capacity, load capacity, grid structure, scale of new energy access, load level and DC power level.

3. The calculation method according to claim 1, characterized in that, The determination of minimum static impact during startup includes: Determine the static influencing factors of the minimum start-up mode. Based on the static influencing factors, determine whether there are overloads or over-limit situations in the UHVDC transmission and receiving end power grids. If so, readjust the basic start-up mode; otherwise, assess the system strength. Determine the system strength. Based on the system strength, determine whether the multi-infeed DC short-circuit ratio and multi-station multi-path ratio of the UHVDC transmitting and receiving end power grid meet the standards. If they do not meet the standards, readjust the basic start-up mode. If they meet the standards, perform static safety analysis. Static safety analysis includes: checking fault-free components of the HVDC transmission and receiving power grid to see if there are any overloads or exceeding limits. If so, the basic start-up method is readjusted; if not, the judgment result is output.

4. The calculation method according to claim 3, characterized in that, After readjusting the basic startup method, the calculation boundary for the minimum startup quantity was redefined.

5. The calculation method according to claim 1, characterized in that, The fault scan includes: AC N-1 fault scan and AC N-2 fault / DC fault scan; After the AC N-1 fault scan, if a fault exists, the basic power-on method is readjusted; if no fault exists, the AC N-2 fault / DC fault scan continues. During the AC N-2 fault / DC fault scanning process, it is determined whether the UHVDC sending and receiving end grid meets the voltage stability constraint and power angle stability constraint. If both are met, it is determined whether the frequency stability constraint is met; otherwise, the minimum start-up mode is adjusted. If the frequency stability constraint is met, the minimum number of generators required to start up at the UHVDC transmission and receiving end of the grid is calculated based on the scanning results; otherwise, the minimum start-up method is adjusted.

6. The calculation method according to claim 5, characterized in that, After readjusting the basic startup method or the minimum startup method, the calculation boundary for the minimum startup quantity is redefined.

7. A calculation system for the minimum start-up capacity of an ultra-high voltage direct current (UHVDC) transmission and receiving end power grid, characterized in that, include: The calculation unit is used to determine the calculation boundary of the minimum operating capacity of the UHVDC transmission and receiving end power grid based on the basic information of the UHVDC transmission and receiving end power grid. The judgment unit is used to judge the minimum static impact of startup within the calculation boundary and obtain the judgment result; The output unit is used to perform fault scanning based on the judgment result, and to calculate the minimum number of units to be started up in the UHVDC transmission and receiving end power grid based on the scanning result.

8. The computing system according to claim 7, characterized in that, The basic information includes: installed power capacity, load capacity, grid structure, scale of new energy access, load level and DC power level.

9. The computing system according to claim 7, characterized in that, The determination of minimum static impact during startup includes: Determine the static influencing factors of the minimum start-up mode. Based on the static influencing factors, determine whether there are overloads or over-limit situations in the UHVDC transmission and receiving end power grids. If so, readjust the basic start-up mode; otherwise, assess the system strength. Determine the system strength. Based on the system strength, determine whether the multi-infeed DC short-circuit ratio and multi-station multi-path ratio of the UHVDC transmitting and receiving end power grid meet the standards. If they do not meet the standards, readjust the basic start-up mode. If they meet the standards, perform static safety analysis. Static safety analysis includes: checking fault-free components of the HVDC transmission and receiving power grid to see if there are any overloads or exceeding limits. If so, the basic start-up method is readjusted; if not, the judgment result is output.

10. The computing system according to claim 9, characterized in that, After readjusting the basic startup method, the calculation boundary for the minimum startup quantity was redefined.

11. The computing system according to claim 7, characterized in that, The fault scan includes: AC N-1 fault scan and AC N-2 fault / DC fault scan; After the AC N-1 fault scan, if a fault exists, the basic power-on method is readjusted; if no fault exists, the AC N-2 fault / DC fault scan continues. During the AC N-2 fault / DC fault scanning process, it is determined whether the UHVDC sending and receiving end grid meets the voltage stability constraint and power angle stability constraint. If both are met, it is determined whether the frequency stability constraint is met; otherwise, the minimum start-up mode is adjusted. If the frequency stability constraint is met, the minimum number of generators required to start up at the UHVDC transmission and receiving end of the grid is calculated based on the scanning results; otherwise, the minimum start-up method is adjusted.

12. The computing system according to claim 11, characterized in that, After readjusting the basic startup method or the minimum startup method, the calculation boundary for the minimum startup quantity is redefined.

13. A computer device, characterized in that, include: One or more processors; A processor is used to execute one or more programs; When the one or more programs are executed by the one or more processors, the method described in any one of claims 1-6 is implemented.

14. A computer-readable storage medium, characterized in that, It contains a computer program, which, when executed, implements the method as described in any one of claims 1-6.

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