Method and system for evaluating voltage supporting capability of network construction type power electronic equipment

Abstract

The invention discloses a method and a system for evaluating the voltage support capability of network construction type power electronic equipment, and belongs to the technical field of voltage support strength analysis. The method comprises the following steps: acquiring equipment parameters of the network construction type power electronic equipment; based on the equipment parameters, the impedance of the network construction type power electronic equipment is calculated; and based on the impedance, evaluating the voltage supporting capability of the network construction type power electronic equipment. Scientific basis is provided for design and operation of a power system, and development of a novel power system and promotion of energy transformation are promoted.

Description

Technical Field

[0001] The present invention relates to the technical field of voltage support strength analysis, and more specifically, to a method and system for evaluating the voltage support capability of a grid-type power electronic device. Background Art

[0002] The grid-based control strategy enables power electronic equipment to simulate the characteristics of synchronous generators, actively adjust their own states, and provide voltage support and inertia for the power grid. This characteristic enables grid-based equipment to provide stable voltage support for the power system and enhance system stability when the system is disturbed. The grid-based control strategy has significant advantages in improving the stability of the power system, enhancing anti-interference capabilities, and improving system flexibility and scalability. These advantages make grid-based control play an increasingly important role in building new power systems and promoting energy transformation.

[0003] Traditional conventional units have clear impedance characteristics in the power system. The main impedance calculation methods include transient impedance, subtransient impedance and steady-state impedance. By calculating and analyzing the impedance of the generator, the stability of the system under different fault conditions can be evaluated, and corresponding response strategies can be formulated, which is helpful for fault location and post-fault recovery work, ensuring that the power system can quickly resume normal operation. The transient, subtransient and steady-state impedance calculation methods of traditional conventional units provide an important theoretical basis and practical application guidance for the analysis and design of power systems, which helps to improve the safety and reliability of power systems and ensure the stable operation of power systems.

[0004] The voltage support capability of power electronic equipment (grid-type equipment) using grid-type control is closely related to its control strategy, especially the calculation of virtual impedance. In practical applications, there are still certain technical difficulties in the evaluation and optimization of the voltage support capability of these devices. At present, there is no clear quantitative analysis method for the voltage support capability of grid-type equipment, which makes it difficult to accurately quantify and optimize the voltage support capability of grid-type equipment when designing and operating power systems. Summary of the invention

[0005] In view of the above problems, the present invention proposes a method for evaluating the voltage support capability of a grid-connected power electronic device, comprising:

[0006] Obtain equipment parameters of grid-type power electronic equipment;

[0007] Based on the equipment parameters, calculating the impedance of the grid-forming power electronic equipment;

[0008] Based on the impedance, the voltage support capability of the grid-type power electronic equipment is evaluated.

[0009] Optional, impedance, including: port impedance Zp between the grid-forming power electronic equipment and the node, steady-state impedance Z N The maximum virtual impedance Z of grid-connected power electronic equipment max .

[0010] Optionally, calculate the port impedance Z between the grid-forming power electronic device and the node p The calculation model is as follows:

[0011] Z p =Z SS +Z RR -2Z SR

[0012] Among them, Z SS is the self-impedance at point S, Z RR is the self-impedance at point R, Z SR is the mutual impedance between point S and point R.

[0013] Optionally, calculate the steady-state impedance Z of the grid-connected power electronic equipment N The calculation model is as follows:

[0014] Z N =x N

[0015] Among them, x N It is the bridge arm reactance and built-in shunt converter reactance of grid-type power electronic equipment.

[0016] Optionally, calculate the maximum virtual impedance Z of the grid-connected power electronic equipment max The calculation model is as follows:

[0017]

[0018] Among them, I N is the rated current of the meshing device, k is the current limiting multiple of the meshing device, and E is the virtual internal potential.

[0019] Optionally, based on the impedance, evaluating the voltage support capability of the grid-type power electronic equipment includes:

[0020] Calculate the short-circuit current I based on the impedance sc With the maximum short-circuit current I max , by comparing the short-circuit current I sc With the maximum short-circuit current I max The size of the grid-type power electronic equipment is determined, and the voltage support strength analysis model of the grid-type power electronic equipment is used to evaluate the voltage support capacity of the grid-type power electronic equipment.

[0021] Optionally, by comparing the short-circuit current I sc With the maximum short-circuit current I max The size of the grid-type power electronic equipment voltage support strength analysis model is determined, including:

[0022] If I sc max , then the voltage support strength analysis model of the grid-type power electronic equipment is the steady-state impedance:

[0023] Z eq =Z N

[0024] Among them, Z eq To construct a voltage support strength analysis model for network-type equipment;

[0025] If I sc ≥I max , then calculate the difference Z between the maximum virtual impedance and the single-port equivalent impedance k , the calculation model is as follows:

[0026] Z k =Z max -Z p

[0027] If Z k ≥Z N ,but:

[0028] Z eq =Z k

[0029] If Z k <Z N ,but:

[0030] Z eq =Z N .

[0031] In another aspect, the present invention further provides a system for evaluating the voltage support capability of a grid-connected power electronic device, comprising:

[0032] A parameter acquisition unit, used to acquire equipment parameters of the grid-forming power electronic equipment;

[0033] A calculation unit, used for calculating the impedance of the grid-forming power electronic device based on the device parameters;

[0034] The evaluation unit is used to evaluate the voltage support capability of the grid-forming power electronic device based on the impedance.

[0035] Optional, impedance, including: port impedance Z between grid-type power electronic equipment and nodes p , the steady-state impedance Z of grid-type power electronic equipment​N The maximum virtual impedance Z of grid-connected power electronic equipment max .

[0036] Optionally, calculate the port impedance Z between the grid-forming power electronic device and the node p The calculation model is as follows:

[0037] Z p =Z SS +Z RR -2Z SR

[0038] Among them, Z SS is the self-impedance at point S, Z RR is the self-impedance at point R, Z SR is the mutual impedance between point S and point R.

[0039] Optionally, calculate the steady-state impedance Z of the grid-connected power electronic equipment N The calculation model is as follows:

[0040] Z N =x N

[0041] Among them, x N It is the bridge arm reactance and built-in shunt converter reactance of grid-type power electronic equipment.

[0042] Optionally, calculate the maximum virtual impedance Z of the grid-connected power electronic equipment max The calculation model is as follows:

[0043]

[0044] Among them, I N is the rated current of the meshing device, k is the current limiting multiple of the meshing device, and E is the virtual internal potential.

[0045] Optionally, based on the impedance, evaluating the voltage support capability of the grid-type power electronic equipment includes:

[0046] Calculate the short-circuit current I based on the impedance sc With the maximum short-circuit current I max , by comparing the short-circuit current I sc With the maximum short-circuit current I max The size of the grid-type power electronic equipment is determined, and the voltage support strength analysis model of the grid-type power electronic equipment is used to evaluate the voltage support capacity of the grid-type power electronic equipment.

[0047] Optionally, by comparing the short-circuit current I sc With the maximum short-circuit current I maxThe size of the grid-type power electronic equipment voltage support strength analysis model is determined, including:

[0048] If I sc max , then the voltage support strength analysis model of the grid-type power electronic equipment is the steady-state impedance:

[0049] Z eq =Z N

[0050] Among them, Z eq To construct a voltage support strength analysis model for network-type equipment;

[0051] If I sc ≥I max , then calculate the difference Z between the maximum virtual impedance and the single-port equivalent impedance k , the calculation model is as follows:

[0052] Z k =Z max -Z p

[0053] If Z k ≥Z N ,but:

[0054] Z eq =Z k

[0055] If Z k <Z N ,but:

[0056] Z eq =Z N .

[0057] In yet another aspect, the present invention further provides a computing device, comprising: one or more processors;

[0058] a processor for executing one or more programs;

[0059] When the one or more programs are executed by the one or more processors, the above-described method is implemented.

[0060] In yet another aspect, the present invention further provides a computer-readable storage medium having a computer program stored thereon, wherein when the computer program is executed, the method described above is implemented.

[0061] Compared with the prior art, the present invention has the following beneficial effects:

[0062] ​The present invention provides a method for evaluating the voltage support capability of a grid-type power electronic device, comprising: obtaining device parameters of the grid-type power electronic device; calculating the impedance of the grid-type power electronic device based on the device parameters; and evaluating the voltage support capability of the grid-type power electronic device based on the impedance. The present invention will provide a scientific basis for the design and operation of power systems, and promote the development of new power systems and the advancement of energy transformation. BRIEF DESCRIPTION OF THE DRAWINGS

[0063] Figure 1 is a flow chart of the method of the present invention;

[0064] Figure 2 It is a structural diagram of the system of the present invention. DETAILED DESCRIPTION

[0065] 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.

[0066] 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.

[0067] Embodiment 1:

[0068] The present invention proposes a method for evaluating the voltage support capability of grid-connected power electronic equipment, such as Figure 1 As shown, including:

[0069] Step 1: Obtain equipment parameters of a grid-forming power electronic device;

[0070] Step 2: Calculate the impedance of the grid-forming power electronic device based on the device parameters;

[0071] Step 3: Based on the impedance, the voltage support capability of the grid-connected power electronic equipment is evaluated.

[0072] Among them, impedance includes: port impedance Zp between grid-type power electronic equipment and node, steady-state impedance Z N The maximum virtual impedance Z of grid-connected power electronic equipment max .

[0073] Among them, the port impedance Z between the grid-forming power electronic equipment and the node is calculated p The calculation model is as follows:

[0074] Z p =Z SS +Z RR -2Z SR

[0075] Among them, Z SS is the self-impedance at point S, Z RR is the self-impedance at point R, Z SR is the mutual impedance between point S and point R.

[0076] Among them, the calculation of the steady-state impedance Z of the grid-type power electronic equipment N The calculation model is as follows:

[0077] Z N =x N

[0078] Among them, x N It is the bridge arm reactance and built-in shunt converter reactance of grid-type power electronic equipment.

[0079] Among them, the maximum virtual impedance Z of the grid-type power electronic equipment is calculated max The calculation model is as follows:

[0080]

[0081] Among them, I N is the rated current of the meshing device, k is the current limiting multiple of the meshing device, and E is the virtual internal potential.

[0082] Wherein, based on the impedance, the voltage support capability of the grid-forming power electronic equipment is evaluated, including:

[0083] Calculate the short-circuit current `I based on the impedance sc With the maximum short-circuit current I max , by comparing the short-circuit current I sc With the maximum short-circuit current I max The size of the grid-type power electronic equipment is determined, and the voltage support strength analysis model of the grid-type power electronic equipment is used to evaluate the voltage support capacity of the grid-type power electronic equipment.

[0084] Among them, by comparing the short-circuit current I sc With the maximum short-circuit current I max The size of the grid-type power electronic equipment voltage support strength analysis model is determined, including:

[0085] If I sc <Imax , then the voltage support strength analysis model of the grid-type power electronic equipment is the steady-state impedance:

[0086] Z eq =Z N

[0087] Among them, Z eq To construct a voltage support strength analysis model for network-type equipment;

[0088] If I sc ≥I max , then calculate the difference Z between the maximum virtual impedance and the single-port equivalent impedance k , the calculation model is as follows:

[0089] Z k =Z max -Z p

[0090] If Z k ≥Z N ,but:

[0091] Z eq =Z k

[0092] If Z k <Z N ,but:

[0093] Z eq =Z N .

[0094] In fact, the present invention proposes a method for calculating the port impedance between the networking device and the node for the above steps 1-3 respectively; proposes a method for calculating the steady-state impedance of the networking device; proposes a method for calculating the maximum virtual impedance of the networking device; and proposes a method for calculating the voltage support strength analysis model of the networking device.

[0095] A method for calculating the port impedance between networking equipment and nodes is proposed, including:

[0096] The power supply in the system is open circuit, point S (representing the network-building device) and point R (representing the short-circuit point) are independent nodes, and the original node network equation is established according to the power grid topology:

[0097]

[0098] In the formula, Z SS is the self-impedance at point S, Z RR is the self-impedance at point R, Z SR is the mutual impedance between point S and point R.

[0099] The equivalent impedance between the original network nodes S and R, that is, the port impedance seen from this port is:

[0100] Z p =Z SS +Z RR -2Z SR (2)

[0101] A method for calculating the steady-state impedance of network-building equipment is proposed, including:

[0102] Z N =x N (3)

[0103] In the formula, Z N is the steady-state impedance of the network-forming device, x N It is the bridge arm reactance of the grid-type equipment and the built-in shunt converter reactance.

[0104] A method for calculating the maximum virtual impedance of networking equipment is proposed, including:

[0105]

[0106] In the formula, Z max is the maximum virtual impedance of the networking device, I N is the rated current of the meshing device, k is the current limiting multiple of the meshing device, and E is the virtual internal potential.

[0107] A calculation method for the voltage support strength analysis model of grid-type equipment is proposed, including:

[0108] The voltage support strength analysis model of the networking equipment is established by comparing the short-circuit current with the maximum short-circuit current. The short-circuit current provided by the networking equipment to the short-circuit point is:

[0109]

[0110] In the formula, I sc The short-circuit current provided by the network-building equipment to the short-circuit point.

[0111] The maximum short-circuit current of the networking equipment is:

[0112] I max =kI N (6)

[0113] In the formula, I max The maximum short-circuit current provided for networking equipment.

[0114] If I sc max , the voltage support strength analysis model of the grid-type equipment is the steady-state impedance:

[0115] Z eq =Z N (7)​

[0116] In the formula, Z eq A voltage support strength analysis model for network-type equipment is constructed.

[0117] If I sc ≥I max , calculate the difference between the maximum virtual impedance and the equivalent impedance of a single port:

[0118] Z k =Z max -Z p (8)

[0119] If Z k ≥Z N ,but:

[0120] Z eq =Z k (9)

[0121] If Z k <Z N ,but:

[0122] Z eq =Z N (10)

[0123] Embodiment 2:

[0124] The present invention also proposes a system 200 for evaluating the voltage support capability of a grid-type power electronic device, such as Figure 2 As shown, including:

[0125] A parameter acquisition unit 201 is used to acquire device parameters of a grid-forming power electronic device;

[0126] A calculation unit 202, configured to calculate the impedance of the grid-forming power electronic device based on the device parameters;

[0127] The evaluation unit 203 is used to evaluate the voltage support capability of the grid-forming power electronic device based on the impedance.

[0128] Among them, impedance includes: port impedance Zp between grid-type power electronic equipment and node, steady-state impedance Z N The maximum virtual impedance Z of grid-connected power electronic equipment max .

[0129] Among them, the port impedance Z between the grid-forming power electronic equipment and the node is calculated p The calculation model is as follows:

[0130] Z p =Z SS +Z RR -2ZSR

[0131] Among them, Z SS is the self-impedance at point S, Z RR is the self-impedance at point R, Z SR is the mutual impedance between point S and point R.

[0132] Among them, the steady-state impedance Z of the grid-type power electronic equipment is calculated N The calculation model is as follows:

[0133] Z N =x N

[0134] Among them, x N It is the bridge arm reactance and built-in shunt converter reactance of grid-type power electronic equipment.

[0135] Among them, the maximum virtual impedance Z of the grid-type power electronic equipment is calculated max The calculation model is as follows:

[0136]

[0137] Among them, I N is the rated current of the meshing device, k is the current limiting multiple of the meshing device, and E is the virtual internal potential.

[0138] Wherein, based on the impedance, the voltage support capability of the grid-type power electronic equipment is evaluated, including:

[0139] Calculate the short-circuit current I based on the impedance sc With the maximum short-circuit current I max , by comparing the short-circuit current I sc With the maximum short-circuit current I max The size of the grid-type power electronic equipment is determined, and the voltage support strength analysis model of the grid-type power electronic equipment is used to evaluate the voltage support capacity of the grid-type power electronic equipment.

[0140] Among them, by comparing the short-circuit current I sc With the maximum short-circuit current I max The size of the grid-type power electronic equipment voltage support strength analysis model is determined, including:

[0141] If I sc max , then the voltage support strength analysis model of the grid-type power electronic equipment is the steady-state impedance:

[0142] Z eq =Z N

[0143] Among them, Z​eq To construct a voltage support strength analysis model for network-type equipment;

[0144] If I sc ≥I max , then calculate the difference Z between the maximum virtual impedance and the single-port equivalent impedance k , the calculation model is as follows:

[0145] Z k =Z max -Z p

[0146] If Z k ≥Z N ,but:

[0147] Z eq =Z k

[0148] If Z k <Z N ,but:

[0149] Z eq =Z N .

[0150] The present invention establishes a quantitative analysis model based on port impedance calculation. This innovative method can accurately evaluate the voltage support capability of grid-forming equipment, optimize its control strategy, and improve the stability and reliability of the power system. Ultimately, the invention will provide a scientific basis for the design and operation of power systems, promote the development of new power systems and advance energy transformation.

[0151] Embodiment 3:

[0152] Based on the same inventive concept, the present invention also provides a computer device, which includes a processor and a memory, wherein the memory is used to store a computer program, the computer program includes program instructions, and the processor is used to execute 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 (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA) or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components, etc. It is the computing core and control core of the terminal, which is suitable for implementing one or more instructions, and is specifically suitable for loading and executing one or more instructions in the computer storage medium to implement the corresponding method flow or corresponding functions, so as to implement the steps of the method in the above embodiment.

[0153] Embodiment 4:

[0154] Based on the same inventive concept, the present invention also provides a storage medium, specifically a computer-readable storage medium (Memory), which is a memory device in a computer device for storing programs and data. It is understandable that the computer-readable storage medium here can include both a built-in storage medium in a computer device and an extended storage medium supported by the computer device. The computer-readable storage medium provides a storage space, which stores the operating system of the terminal. In addition, one or more instructions suitable for being loaded and executed by a processor are also stored in the storage space, and these instructions can be one or more computer programs (including program codes). It should be noted that the computer-readable storage medium here can be a high-speed RAM memory or a non-volatile memory, such as at least one disk memory. 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 embodiment.

[0155] It will be appreciated by those skilled in the art that embodiments of the present invention may be provided as methods, systems, or computer program products. Therefore, the present invention may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, the present invention may 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 codes. The schemes in the embodiments of the present invention may be implemented in various computer languages, for example, object-oriented programming language Java and literal scripting language JavaScript, etc.

[0156] The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of processes and / or blocks 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 produce 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.

[0157] 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.

[0158] 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.

[0159] Although the preferred embodiments of the present invention 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 that fall within the scope of the present invention.

[0160] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A method for evaluating the voltage support capability of a grid-connected power electronic device, characterized in that: include: Obtain equipment parameters of grid-type power electronic equipment; Based on the equipment parameters, calculating the impedance of the grid-forming power electronic equipment; Based on the impedance, the voltage support capability of the grid-type power electronic equipment is evaluated.

2. The method according to claim 1, characterized in that: The impedance includes: the port impedance Z between the grid-type power electronic equipment and the node p , the steady-state impedance Z of grid-type power electronic equipment N The maximum virtual impedance Z of grid-connected power electronic equipment max .

3. The method according to claim 2, characterized in that Calculate the port impedance Z between the grid-connected power electronic equipment and the node p The calculation model is as follows: WITH p =Z SS +Z RR -2Z SR Among them, Z SS is the self-impedance at point S, Z RR is the self-impedance at point R, Z SR is the mutual impedance between point S and point R.

4. The method according to claim 2, characterized in that: Calculation of Steady-State Impedance Z of Grid-Based Power Electronic Equipment N The calculation model is as follows: Z N =x N Among them, x N It is the bridge arm reactance and built-in shunt converter reactance of grid-type power electronic equipment.

5. The method according to claim 2, characterized in that: Calculation of the maximum virtual impedance Z of grid-connected power electronic equipment max The calculation model is as follows: Among them, I N is the rated current of the meshing device, k is the current limiting multiple of the meshing device, and E is the virtual internal potential.

6. The method according to claim 1, characterized in that The step of evaluating the voltage support capability of the grid-type power electronic device based on the impedance includes: Calculate the short-circuit current I based on the impedance sc With the maximum short-circuit current I max , by comparing the short-circuit current I sc With the maximum short-circuit current I max The size of the grid-type power electronic equipment is determined, and the voltage support strength analysis model of the grid-type power electronic equipment is used to evaluate the voltage support capacity of the grid-type power electronic equipment.

7. The method according to claim 6, characterized in that By comparing the short-circuit current I sc With the maximum short-circuit current I max The size of the grid-type power electronic equipment voltage support strength analysis model is determined. include: If I sc max , then the voltage support strength analysis model of the grid-type power electronic equipment is the steady-state impedance:​ WITH eq =Z N Among them, Z eq To construct a voltage support strength analysis model for network-type equipment; If I sc ≥I max , then calculate the difference Z between the maximum virtual impedance and the single-port equivalent impedance k , the calculation model is as follows: WITH k =Z max -WITH p If Z k ≥Z N ,but: WITH eq =Z k If Z k <Z N ,but: WITH eq =Z N 。 8. A system for evaluating the voltage support capability of a grid-connected power electronic device, characterized in that: include: A parameter acquisition unit, used to acquire equipment parameters of the grid-forming power electronic equipment; A calculation unit, used for calculating the impedance of the grid-forming power electronic device based on the device parameters; The evaluation unit is used to evaluate the voltage support capability of the grid-forming power electronic device based on the impedance.

9. The system according to claim 8, characterized in that The impedance includes: the port impedance Z between the grid-type power electronic equipment and the node p , the steady-state impedance Z of grid-type power electronic equipment N The maximum virtual impedance Z of grid-connected power electronic equipment max .

10. The system according to claim 9, characterized in that Calculate the port impedance Z between the grid-connected power electronic equipment and the node p The calculation model is as follows: WITH p =Z SS +Z RR -2Z SR Among them, Z SS is the self-impedance at point S, Z RR is the self-impedance at point R, Z SR is the mutual impedance between point S and point R.

11. The system according to claim 10, characterized in that Calculation of Steady-State Impedance Z of Grid-Based Power Electronic Equipment N The calculation model is as follows: Z N =x N Among them, x N It is the bridge arm reactance and built-in shunt converter reactance of grid-type power electronic equipment.

12. The system according to claim 10, characterized in that Calculation of the maximum virtual impedance Z of grid-connected power electronic equipment max The calculation model is as follows: Among them, I N is the rated current of the meshing device, k is the current limiting multiple of the meshing device, and E is the virtual internal potential.

13. The system according to claim 8, characterized in that The step of evaluating the voltage support capability of the grid-type power electronic device based on the impedance includes: Calculate the short-circuit current I based on the impedance sc With the maximum short-circuit current I max , by comparing the short-circuit current I sc With the maximum short-circuit current I max The size of the grid-type power electronic equipment is determined, and the voltage support strength analysis model of the grid-type power electronic equipment is used to evaluate the voltage support capacity of the grid-type power electronic equipment.

14. The system according to claim 8, characterized in that By comparing the short-circuit current I sc With the maximum short-circuit current I max The size of the grid-type power electronic equipment voltage support strength analysis model is determined. include: If I sc max , then the voltage support strength analysis model of the grid-type power electronic equipment is the steady-state impedance:​ WITH eq =Z N Among them, Z eq To construct a voltage support strength analysis model for network-type equipment; If I sc ≥I max , then calculate the difference Z between the maximum virtual impedance and the single-port equivalent impedance k , the calculation model is as follows: WITH k =Z max -WITH p If Z k ≥Z N ,but: WITH eq =Z k If Z k <Z N ,but: WITH eq =Z N 。 15. A computer device, characterized in that: include: one or more processors; a processor for executing one or more programs; When the one or more programs are executed by the one or more processors, the method according to any one of claims 1 to 7 is implemented.

16. A computer-readable storage medium, characterized in that: A computer program is stored thereon, and when the computer program is executed, the method according to any one of claims 1 to 7 is implemented.

Images