New energy short-circuit ratio optimization evaluation method considering new energy voltage supporting capability

Abstract

The invention discloses a new energy short-circuit ratio optimization evaluation method and system considering new energy voltage support capability, and the method comprises the steps: determining typical operation mode data of a new energy multi-station access regional power grid; according to the typical operation mode data, calculating a short-circuit current of a new energy gathering point and a short-circuit current contributed by each new energy station when a new energy node is open-circuited; determining a short-circuit capacity conversion coefficient of each new energy station according to the short-circuit current of the new energy gathering point when the new energy node is open-circuited, the short-circuit current contributed by each new energy station and the reactive support coefficient of the new energy station; calculating the system equivalent capacity of the node according to the short-circuit capacity conversion coefficient; calculating new energy equivalent capacity according to the short-circuit current contributed by each new energy station; and based on the system equivalent capacity and the new energy equivalent capacity, calculating the new energy multi-station optimized short-circuit ratio considering the influence of the new energy reactive power support capacity.

Description

Technical Field

[0001] The present invention relates to the technical field of power systems, and more specifically, to a new energy short-circuit ratio optimization evaluation method and system taking into account the voltage support capability of new energy. Background Art

[0002] In the context of a high proportion of new energy access, improving the short-circuit ratio calculation and analysis capabilities is of great significance for the high-quality consumption of new energy, safe and stable operation of the system, and promoting the realization of green energy transformation. It is urgently necessary to propose a convenient calculation method suitable for engineering practice from the aspects of short-circuit current characteristics and short-circuit ratio calculation methods to support the energy transformation process.

[0003] Wind power and photovoltaic units have certain voltage regulation capabilities but they are relatively weak. When connected to a weak power grid, they are easily disconnected from the grid due to voltage fluctuations. The system needs to provide voltage support to ensure safe operation. The short circuit ratio (SCR) is an important indicator to measure the voltage support strength of the system. The critical short circuit ratio (CSCR) is the short circuit ratio corresponding to the critical stable state of the system. By comparing the current short circuit ratio of the system with its critical short circuit ratio, the operating state of the system can be judged, and the voltage support strength of the system can be evaluated, which helps to control the impact of the new energy grid connection and is of great significance to ensure the safe and stable operation of the new energy grid connection system.

[0004] Similar to traditional high-voltage direct current access to the power grid, engineering practical calculations usually draw on the short-circuit ratio method of traditional direct current to calculate the short-circuit ratio of new energy, so as to quantitatively evaluate and analyze the stability process of new energy access to the power grid, which is of great significance to the stability of new energy access to the power grid. The calculation of the short-circuit ratio of new energy access needs to fully consider the short-circuit current characteristics contributed by new energy, and needs to be deeply analyzed from the perspective of its control and protection principles. At present, relevant results have been achieved in the calculation of new energy short-circuit current, and the engineering practical short-circuit current calculation software PSD-SCCP already has relevant calculation functions. SCCP already has relevant calculation functions, but the current calculation method does not consider the contribution of new energy to the system capacity when dealing with the system short-circuit capacity, and fails to take into account the stable support role of the dynamic voltage regulation capability of new energy equipment on the system. Summary of the invention

[0005] According to the present invention, a new energy short-circuit ratio optimization evaluation method and system taking into account the voltage support capacity of new energy are provided to solve the technical problems that the current calculation method does not consider the contribution of new energy to the system capacity when processing the system short-circuit capacity, and fails to take into account the role of the dynamic voltage regulation capability of new energy equipment in supporting the stability of the system.

[0006] According to a first aspect of the present invention, there is provided a new energy short-circuit ratio optimization evaluation method considering the new energy voltage support capability, comprising:

[0007] Determine typical operating mode data for multiple renewable energy stations connected to regional power grids;

[0008] According to the typical operation mode data, the short-circuit current of the new energy collection point and the short-circuit current contributed by each new energy station when the new energy node is open are calculated;

[0009] Determine the short-circuit capacity conversion coefficient of each new energy station according to the short-circuit current of the new energy collection point when the new energy node is open, the short-circuit current contributed by each new energy station, and the reactive support coefficient of the new energy station;

[0010] Calculate the system equivalent capacity of the node according to the short-circuit capacity conversion coefficient;

[0011] Calculate the new energy equivalent capacity based on the short-circuit current contributed by each new energy station;

[0012] Based on the system equivalent capacity and the new energy equivalent capacity, the optimized short-circuit ratio of multiple new energy stations is calculated taking into account the influence of the reactive power support capacity of new energy.

[0013] Optionally, according to the typical operation mode data, calculating the short-circuit current of the new energy collection point and the short-circuit current contributed by each new energy station when the new energy node is open-circuited includes:

[0014] Without considering the short-circuit current contribution of the renewable energy power generation station, the short-circuit current of the renewable energy collection point when the renewable energy node is open-circuited is calculated based on the typical operation mode data; or

[0015] Taking into account the short-circuit current contribution of renewable energy power generation stations, the short-circuit current contribution of each renewable energy station is calculated based on the typical operation mode data.

[0016] Optionally, calculating the system equivalent capacity of the node according to the short-circuit capacity conversion coefficient includes:

[0017] According to the following formula, the system equivalent capacity S of node i is calculated: ac,i :

[0018]

[0019] in, is the new energy capacity connected to node i; is the mutual impedance of nodes i and j and the self-impedance of node i in the impedance matrix; is the voltage at nodes i and j, U n is the rated voltage of node i; is the open circuit voltage at node i, are other new energy stations in the vicinity of node i.

[0020] Optionally, based on the system equivalent capacity and the new energy equivalent capacity, the new energy multi-station optimized short-circuit ratio considering the influence of the new energy reactive power support capacity is calculated, including:

[0021] Calculate the optimal short-circuit ratio SCR of renewable energy multi-stations considering the influence of renewable energy reactive support capacity i ;

[0022]

[0023] in, is the new energy capacity connected to nodes i and j; is the mutual impedance of nodes i and j and the self-impedance of node i in the impedance matrix; is the voltage at nodes i and j, U n is the rated voltage of node i; is the open circuit voltage at node i.

[0024] According to another aspect of the present invention, there is also provided a new energy short-circuit ratio optimization evaluation system considering the voltage support capability of new energy, comprising:

[0025] Determine the typical operation data module, which is used to determine the typical operation mode data of multiple new energy stations connected to the regional power grid;

[0026] A short-circuit current determination module is used to calculate the short-circuit current of the new energy collection point and the short-circuit current contributed by each new energy station when the new energy node is open-circuited according to the typical operation mode data;

[0027] A conversion coefficient determination module is used to determine the short-circuit capacity conversion coefficient of each new energy station according to the short-circuit current of the new energy collection point when the new energy node is open, the short-circuit current contributed by each new energy station, and the reactive support coefficient of the new energy station;

[0028] A system equivalent capacity calculation module, used to calculate the system equivalent capacity of the node according to the short-circuit capacity conversion coefficient;

[0029] A module for calculating the equivalent capacity of new energy sources is used to calculate the equivalent capacity of new energy sources according to the short-circuit current contributed by each new energy station;

[0030] The module for calculating the optimized short-circuit ratio is used to calculate the optimized short-circuit ratio of multiple renewable energy stations taking into account the influence of the reactive power support capacity of renewable energy based on the equivalent capacity of the system and the equivalent capacity of renewable energy.

[0031] Optionally, the short-circuit current determination module includes:

[0032] A submodule for calculating short-circuit current at a renewable energy collection point is used to calculate the short-circuit current at a renewable energy collection point when a renewable energy node is open-circuited based on the typical operation mode data without considering the short-circuit current contribution of renewable energy power generation stations; or

[0033] The submodule for calculating the short-circuit current contribution of the renewable energy stations is used to consider the short-circuit current contribution of the renewable energy power generation stations and calculate the short-circuit current contribution of each renewable energy station based on the typical operation mode data.

[0034] Optionally, a calculation system equivalent capacity module includes:

[0035] The calculation system equivalent capacity submodule is used to calculate the system equivalent capacity S of node i according to the following formula ac,i :

[0036]

[0037] in, is the new energy capacity connected to node i; is the mutual impedance of nodes i and j and the self-impedance of node i in the impedance matrix; is the voltage at nodes i and j, U n is the rated voltage of node i; is the open circuit voltage at node i, are other new energy stations in the vicinity of node i.

[0038] Optionally, a module for calculating and optimizing the short-circuit ratio includes:

[0039] The calculation and optimization short-circuit ratio submodule is used to calculate the optimized short-circuit ratio SCR of multiple renewable energy stations considering the influence of renewable energy reactive power support capacity. i ;

[0040]

[0041] in, is the new energy capacity connected to nodes i and j; is the mutual impedance of nodes i and j and the self-impedance of node i in the impedance matrix; is the voltage at nodes i and j, U n is the rated voltage of node i; is the open circuit voltage at node i.

[0042] Therefore, it is possible to combine the dynamic voltage regulation and reactive power support capabilities of new energy stations to determine their capacity conversion coefficients when calculating the short-circuit ratio, and provide an optimized calculation method for the short-circuit ratio considering multiple new energy stations. Based on the existing relevant calculation functions of the engineering practical short-circuit current calculation software PSD-SCCP, a practical engineering optimization calculation method for the short-circuit ratio of multiple new energy stations is provided to achieve a convenient evaluation of the short-circuit ratio considering the access of multiple new energy stations. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] A more complete understanding of exemplary embodiments of the present invention may be obtained by referring to the following drawings:

[0044] Figure 1 A schematic flow chart of a new energy short-circuit ratio optimization evaluation method considering the new energy voltage support capability described in this embodiment;

[0045] Figure 2 A schematic diagram of a new energy short-circuit ratio optimization evaluation method considering the new energy voltage support capability described in this embodiment;

[0046] Figure 3 This is a schematic diagram of a new energy short-circuit ratio optimization evaluation system taking into account the new energy voltage support capability described in this embodiment. DETAILED DESCRIPTION

[0047] Now, exemplary embodiments of the present invention are described with reference to the accompanying drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. These embodiments are provided to disclose the present invention in detail and completely and to fully convey the scope of the present invention to those skilled in the art. The terms used in the exemplary embodiments shown in the accompanying drawings are not intended to limit the present invention. In the accompanying drawings, the same units / elements are marked with the same reference numerals.

[0048] Unless otherwise specified, the terms (including technical terms) used herein have the commonly understood meanings to those skilled in the art. In addition, it is understood that the terms defined in commonly used dictionaries should be understood to have the same meanings as those in the context of the relevant fields, and should not be understood as idealized or overly formal meanings.

[0049] According to a first aspect of the present invention, a new energy short-circuit ratio optimization evaluation method 100 considering the voltage support capability of new energy is provided, referring to Figure 1 As shown, the method 100 includes:

[0050] S101: Determine typical operation mode data of multiple renewable energy stations connected to the regional power grid; S102:;

[0051] S102: Calculate the short-circuit current of the new energy collection point and the short-circuit current contributed by each new energy station when the new energy node is open according to the typical operation mode data;

[0052] S103: Determine the short-circuit capacity conversion coefficient of each new energy station according to the short-circuit current of the new energy collection point when the new energy node is open, the short-circuit current contributed by each new energy station, and the reactive support coefficient of the new energy station;

[0053] S104: Calculating the system equivalent capacity of the node according to the short-circuit capacity conversion coefficient;

[0054] S105: Calculating the new energy equivalent capacity according to the short-circuit current contributed by each new energy station;

[0055] S106: Based on the system equivalent capacity and the new energy equivalent capacity, calculate the optimized short-circuit ratio of multiple new energy stations taking into account the influence of the reactive power support capacity of new energy.

[0056] Specifically, during a short-circuit fault, the short-circuit current reactive component contributed by wind power, photovoltaic power and other new energy sources, and the dynamic reactive support capacity provided to the system are closely related to their reactive support coefficient. The dynamic reactive support capacity provided by wind power and photovoltaic power stations to the AC system is determined by the coefficient I T OK, currently typical I T The fixed value is 1.5-3.0. The larger the fixed value, the stronger the dynamic reactive power support capacity of new energy. SCCP already has relevant calculation functions, but the current calculation method does not consider the contribution of new energy to the system capacity when dealing with the system short-circuit capacity, and fails to take into account the stable support role of the dynamic voltage regulation capability of new energy equipment on the system. Based on SCCP, this patent proposes a new energy short-circuit ratio optimization evaluation method process that takes into account the voltage support capacity of new energy.

[0057] refer to Figure 2 As shown, calculation data preparation work is performed to prepare typical operating mode data of multiple renewable energy stations connected to the regional power grid to form a data file suitable for short-circuit current analysis and calculation.

[0058] Without considering the short-circuit current contribution of renewable energy power generation stations, the short-circuit current of the renewable energy collection point when the renewable energy node is open is calculated.

[0059] Taking into account the short-circuit current contribution of renewable energy power generation stations, the short-circuit current contribution of each renewable energy station is calculated based on the short-circuit current calculation standard for the renewable energy station access system.

[0060] According to the reactive power support coefficient K of the new energy station T , according to the parameter matching table in the appendix, obtain the short-circuit ratio calculation conversion coefficient K under different new energy dynamic reactive power support capabilities.

[0061] Based on the obtained conversion coefficient, the system equivalent capacity S of node i is calculated according to the following formula: ac,i .

[0062]

[0063] in, is the new energy capacity connected to node i; is the mutual impedance of nodes i and j and the self-impedance of node i in the impedance matrix; is the voltage at nodes i and j, U n is the rated voltage of node i; is the open circuit voltage at node i, are other new energy stations in the vicinity of node i.

[0064] The optimized short-circuit ratio SCR of new energy multi-station considering the influence of new energy reactive power support capacity is calculated according to the following formula: i ;

[0065] in, is the new energy capacity connected to nodes i and j; is the mutual impedance of nodes i and j and the self-impedance of node i in the impedance matrix; is the voltage at nodes i and j, U n is the rated voltage of node i; is the open circuit voltage at node i.

[0066] Referring to Table 1, the reactive power support coefficient K of the new energy station to be analyzed is T The matching table of the conversion coefficient K calculated with the short-circuit ratio is as follows. If the reactive support coefficient value is between two points, the broken line interpolation method is used for calculation:

[0067] Table 1 Reactive power support factor KT and short circuit ratio calculation conversion factor K matching table

[0068] type Match 1 Match 2 Match 3 Match 4 Match 5 Reactive power support coefficient of new energy 1.5 1.8 2.0 2.5 3.0 Short circuit ratio conversion factor 0.1 0.15 0.18 0.22 0.35

[0069] Taking the power grid in a domestic area with dense new energy access as an example, the applicability of the short-circuit ratio optimization calculation method affected by multiple new energy stations is analyzed.

[0070] First, based on SCCP, the short-circuit current calculation value I of each renewable energy multi-station access to the key node near the evaluated grid is calculated with or without considering renewable energy access. k2 ,I k1 , and combined with the regional new energy reactive power support coefficient, determine the conversion coefficient K of the new energy station when calculating different key nodes.

[0071] Then, based on SCCP, the short-circuit ratio of key nodes under the current short-circuit ratio calculation method is calculated; and the short-circuit ratio optimization calculation value under this standard method is calculated. The comparison of the short-circuit ratio calculation results of the two algorithms is shown in Table 2.

[0072] Table 2 Comparison of current and optimized calculation methods for short-circuit ratio indicators of multiple new energy stations in a certain domestic new energy intensive access area

[0073]

[0074] It can be seen that in the calculation and analysis of the short-circuit ratio of key nodes in the typical example power grid, the short-circuit ratio index of new energy multiple stations calculated by this method is improved compared with the existing method because the dynamic reactive power support capability of new energy to the access system is taken into account. This is consistent with the theoretical analysis and engineering experience, which proves the applicability of this method in the actual power grid.

[0075] Therefore, it is possible to combine the dynamic voltage regulation and reactive power support capabilities of new energy stations to determine their capacity conversion coefficients when calculating short-circuit ratios, and provide an optimized calculation method for short-circuit ratios that considers multiple new energy stations. Based on the existing relevant calculation functions of the engineering practical short-circuit current calculation software PSD-SCCP, a simplified conversion relationship between the new energy reactive power support coefficient obtained from engineering calculation experience and the short-circuit capacity conversion is provided, and an engineering practical optimization calculation method for short-circuit ratios of multiple new energy stations is proposed, realizing a convenient evaluation of short-circuit ratios that consider the access of multiple new energy stations.

[0076] Optionally, according to the typical operation mode data, calculating the short-circuit current of the new energy collection point and the short-circuit current contributed by each new energy station when the new energy node is open-circuited includes:

[0077] Without considering the short-circuit current contribution of the renewable energy power generation station, the short-circuit current of the renewable energy collection point when the renewable energy node is open-circuited is calculated based on the typical operation mode data; or

[0078] Taking into account the short-circuit current contribution of renewable energy power generation stations, the short-circuit current contribution of each renewable energy station is calculated based on the typical operation mode data.

[0079] Optionally, calculating the system equivalent capacity of the node according to the short-circuit capacity conversion coefficient includes:

[0080] According to the following formula, the system equivalent capacity S of node i is calculated: ac,i :

[0081]

[0082] in, is the new energy capacity connected to node i; is the mutual impedance of nodes i and j and the self-impedance of node i in the impedance matrix; is the voltage at nodes i and j, U n is the rated voltage of node i; is the open circuit voltage at node i, are other new energy stations in the vicinity of node i.

[0083] Optionally, based on the system equivalent capacity and the new energy equivalent capacity, the new energy multi-station optimized short-circuit ratio considering the influence of the new energy reactive power support capacity is calculated, including:

[0084] Calculate the optimal short-circuit ratio SCR of renewable energy multi-stations considering the influence of renewable energy reactive support capacity i ;

[0085]

[0086] in, is the new energy capacity connected to nodes i and j; is the mutual impedance of nodes i and j and the self-impedance of node i in the impedance matrix; is the voltage at nodes i and j, U n is the rated voltage of node i; is the open circuit voltage at node i.

[0087] According to another aspect of the present invention, a new energy short-circuit ratio optimization evaluation system 300 considering the voltage support capability of new energy is also provided. Figure 3 As shown, the system 300 includes:

[0088] A typical operation data determination module 310 is used to determine typical operation mode data of multiple renewable energy stations connected to a regional power grid;

[0089] A short-circuit current determination module 320 is used to calculate the short-circuit current of the new energy collection point and the short-circuit current contributed by each new energy station when the new energy node is open-circuited according to the typical operation mode data;

[0090] The conversion coefficient determination module 330 is used to determine the short-circuit capacity conversion coefficient of each new energy station according to the short-circuit current of the new energy collection point when the new energy node is open, the short-circuit current contributed by each new energy station, and the reactive support coefficient of the new energy station;

[0091] A system equivalent capacity calculation module 340 is used to calculate the system equivalent capacity of the node according to the short-circuit capacity conversion coefficient;

[0092] A new energy equivalent capacity calculation module 350 is used to calculate the new energy equivalent capacity according to the short-circuit current contributed by each new energy station;

[0093] The module 360 ​​for calculating the optimized short-circuit ratio is used to calculate the optimized short-circuit ratio of multiple renewable energy stations taking into account the influence of the reactive power support capacity of renewable energy based on the equivalent capacity of the system and the equivalent capacity of renewable energy.

[0094] Optionally, the short-circuit current determination module includes:

[0095] A submodule for calculating short-circuit current at a renewable energy collection point is used to calculate the short-circuit current at a renewable energy collection point when a renewable energy node is open-circuited based on the typical operation mode data without considering the short-circuit current contribution of renewable energy power generation stations; or

[0096] The submodule for calculating the short-circuit current contribution of the renewable energy stations is used to consider the short-circuit current contribution of the renewable energy power generation stations and calculate the short-circuit current contribution of each renewable energy station based on the typical operation mode data.

[0097] Optionally, a calculation system equivalent capacity module includes:

[0098] The calculation system equivalent capacity submodule is used to calculate the system equivalent capacity S of node i according to the following formula ac,i :

[0099]

[0100] in, is the new energy capacity connected to node i; is the mutual impedance of nodes i and j and the self-impedance of node i in the impedance matrix; is the voltage at nodes i and j, U n is the rated voltage of node i; is the open circuit voltage at node i, are other new energy stations in the vicinity of node i.

[0101] Optionally, a module for calculating and optimizing the short-circuit ratio includes:

[0102] The calculation and optimization short-circuit ratio submodule is used to calculate the optimized short-circuit ratio SCR of multiple renewable energy stations considering the influence of renewable energy reactive power support capacity. i ;

[0103]

[0104] in, is the new energy capacity connected to nodes i and j; is the mutual impedance of nodes i and j and the self-impedance of node i in the impedance matrix; is the voltage at nodes i and j, U n is the rated voltage of node i; is the open circuit voltage at node i.

[0105] A new energy short-circuit ratio optimization evaluation system 300 considering the voltage support capability of new energy according to an embodiment of the present invention corresponds to a new energy short-circuit ratio optimization evaluation method 100 considering the voltage support capability of new energy according to another embodiment of the present invention, which will not be repeated here.

[0106] Those skilled in the art will appreciate that the embodiments of the present application can be provided as methods, systems, or computer program products. Therefore, the present application can adopt the form of complete hardware embodiments, complete software embodiments, or embodiments in combination with software and hardware. Moreover, the present application can adopt 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.) that contain computer-usable program code. The scheme in the embodiments of the present application can be implemented in various computer languages, for example, object-oriented programming language Java and literal scripting language JavaScript, etc.

[0107] 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.

[0108] 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.

[0109] 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.

[0110] Although the preferred embodiments of the present application have been described, those skilled in the art may make other changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications falling within the scope of the present application.

[0111] Obviously, those skilled in the art can make various changes and modifications to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is also intended to include these modifications and variations.

Claims

1. A new energy short-circuit ratio optimization evaluation method considering the voltage support capability of new energy, characterized in that: include: Determine typical operating mode data for multiple renewable energy stations connected to regional power grids; According to the typical operation mode data, the short-circuit current of the new energy collection point and the short-circuit current contributed by each new energy station when the new energy node is open are calculated; Determine the short-circuit capacity conversion coefficient of each new energy station according to the short-circuit current of the new energy collection point when the new energy node is open, the short-circuit current contributed by each new energy station, and the reactive support coefficient of the new energy station; Calculate the system equivalent capacity of the node according to the short-circuit capacity conversion coefficient; Calculate the new energy equivalent capacity based on the short-circuit current contributed by each new energy station; Based on the system equivalent capacity and the new energy equivalent capacity, the optimized short-circuit ratio of multiple new energy stations is calculated taking into account the influence of the reactive power support capacity of new energy.

2. The method according to claim 1, characterized in that According to the typical operation mode data, the short-circuit current of the new energy collection point and the short-circuit current contributed by each new energy station when the new energy node is open are calculated, including: Without considering the short-circuit current contribution of the renewable energy power generation station, the short-circuit current of the renewable energy collection point when the renewable energy node is open-circuited is calculated based on the typical operation mode data; or Taking into account the short-circuit current contribution of renewable energy power generation stations, the short-circuit current contribution of each renewable energy station is calculated based on the typical operation mode data.

3. The method according to claim 1, characterized in that According to the short-circuit capacity conversion coefficient, the system equivalent capacity of the node is calculated, including: According to the following formula, the system equivalent capacity S of node i is calculated: ac,i : in, is the new energy capacity connected to node i; is the mutual impedance of nodes i and j and the self-impedance of node i in the impedance matrix; is the voltage of nodes i and j, U n is the rated voltage of node i; is the open circuit voltage at node i, are other new energy stations in the vicinity of node i.

4. The method according to claim 3, characterized in that Based on the equivalent capacity of the system and the equivalent capacity of new energy, the optimized short-circuit ratio of multiple new energy stations considering the influence of the reactive power support capacity of new energy is calculated, including: Calculate the optimal short-circuit ratio SCR of renewable energy multi-stations considering the influence of renewable energy reactive support capacity i ; in, is the new energy capacity connected to nodes i and j; is the mutual impedance of nodes i and j and the self-impedance of node i in the impedance matrix; is the voltage of nodes i and j, U n is the rated voltage of node i; is the open circuit voltage at node i.

5. A new energy short-circuit ratio optimization evaluation system considering the voltage support capability of new energy, characterized in that: include: Determine the typical operation data module, which is used to determine the typical operation mode data of multiple new energy stations connected to the regional power grid; A short-circuit current determination module is used to calculate the short-circuit current of the new energy collection point and the short-circuit current contributed by each new energy station when the new energy node is open-circuited according to the typical operation mode data; A conversion coefficient determination module is used to determine the short-circuit capacity conversion coefficient of each new energy station according to the short-circuit current of the new energy collection point when the new energy node is open, the short-circuit current contributed by each new energy station, and the reactive support coefficient of the new energy station; A system equivalent capacity calculation module, used to calculate the system equivalent capacity of the node according to the short-circuit capacity conversion coefficient; A module for calculating the equivalent capacity of new energy sources is used to calculate the equivalent capacity of new energy sources according to the short-circuit current contributed by each new energy station; The module for calculating the optimized short-circuit ratio is used to calculate the optimized short-circuit ratio of multiple renewable energy stations taking into account the influence of the reactive power support capacity of renewable energy based on the equivalent capacity of the system and the equivalent capacity of renewable energy.

6. The system according to claim 5, characterized in that Determine short-circuit current module, including: A submodule for calculating short-circuit current at a renewable energy collection point is used to calculate the short-circuit current at a renewable energy collection point when a renewable energy node is open-circuited based on the typical operation mode data without considering the short-circuit current contribution of renewable energy power generation stations; or The submodule for calculating the short-circuit current contribution of the renewable energy stations is used to consider the short-circuit current contribution of the renewable energy power generation stations and calculate the short-circuit current contribution of each renewable energy station based on the typical operation mode data.

7. The system according to claim 5, characterized in that Calculate the system equivalent capacity module, including: The calculation system equivalent capacity submodule is used to calculate the system equivalent capacity S of node i according to the following formula ac,i : in, is the new energy capacity connected to node i; is the mutual impedance of nodes i and j and the self-impedance of node i in the impedance matrix; is the voltage of nodes i and j, U n is the rated voltage of node i; is the open circuit voltage at node i, are other new energy stations in the vicinity of node i.

8. The system according to claim 7, characterized in that Calculate and optimize the short-circuit ratio module, including: The calculation and optimization short-circuit ratio submodule is used to calculate the optimized short-circuit ratio SCR of multiple renewable energy stations considering the influence of renewable energy reactive power support capacity. i ; in, is the new energy capacity connected to nodes i and j; is the mutual impedance of nodes i and j and the self-impedance of node i in the impedance matrix; is the voltage of nodes i and j, U n is the rated voltage of node i; is the open circuit voltage at node i.

9. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the program is executed by a processor, the steps of the method according to any one of claims 1 to 4 are implemented.

10. An electronic device, characterized in that: include: The computer readable storage medium as claimed in claim 9; as well as One or more processors are used to execute the program in the computer-readable storage medium.

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