CN116244880A - Electromagnetic transient simulation modeling method and system for electrochemical energy storage power station - Google Patents
Electromagnetic transient simulation modeling method and system for electrochemical energy storage power station Download PDFInfo
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Abstract
The invention discloses an electromagnetic transient simulation modeling method and system for an electrochemical energy storage power station, and belongs to the technical field of power systems. The method of the invention comprises the following steps: establishing an electromagnetic transient simulation typical data model of the electrochemical energy storage power station and an access power grid near zone; determining whether the reactive component of the energy storage unit outlet short-circuit current meets a preset standard and a preset precision requirement; and if so, packaging the electromagnetic transient simulation typical data model as an electromagnetic transient simulation model of the electrochemical energy storage power station to complete modeling. According to the invention, on the basis of meeting the general requirements of modeling of electrochemical energy storage equipment, the model parameters related to analysis of short-circuit current of each energy storage equipment unit in the energy storage power station can be adjusted through electromagnetic transient iterative simulation of near-area alternating current faults of the energy storage power station according to related operation requirements such as national standards, so that the refined analysis of near-area short-circuit current of the parallel grid of the energy storage power station is realized.
Description
Technical Field
The invention relates to the technical field of power systems, in particular to an electromagnetic transient simulation modeling method and system for an electrochemical energy storage power station.
Background
In operation of the power system, a short-circuit fault is one of the most common faults, and the short-circuit current generated by the short-circuit fault can have serious influence and consequences on the safe and stable operation of the power system. At present, the receiving-end power grid in China generally faces the risk of exceeding the standard of short-circuit current, and when the short-circuit current level of the power grid is low as a whole, the new equipment grid connection mainly focuses on the influence of the new equipment grid connection on the stability characteristics of the power grid, and the auxiliary effect of the new equipment grid connection on the short-circuit current only needs to be simply evaluated. As the short-circuit current level of the power grid gradually approaches or reaches the rated interruption capacity of the switch, the new equipment, in particular to the electrochemical energy storage equipment which is connected with the power grid through a full-power converter, needs to pay attention to the influence of the new equipment on the short-circuit current level after the new equipment is connected with the power grid. With the continuous promotion of double carbon processes in China, the capacity ratio of the electrochemical energy storage device is continuously improved, and the influence on the short-circuit current of an alternating current system cannot be ignored.
Disclosure of Invention
In order to solve the above problems, the invention provides an electromagnetic transient simulation modeling method for an electrochemical energy storage power station, comprising the following steps:
basic data of an electrochemical energy storage power station and an access power grid near zone are obtained, and an electromagnetic transient simulation typical data model of the electrochemical energy storage power station and the access power grid near zone is established according to the basic data;
performing single-phase/three-phase short-circuit fault time domain simulation of the near zone of the electrochemical energy storage power station on the electromagnetic transient simulation typical data model to obtain time domain simulation data, determining fault current of the single-phase/three-phase short-circuit fault based on the time domain simulation data, if the fault current is a positive sequence component, determining whether the positive sequence current component of an outlet short-circuit current component of an energy storage unit in the electrochemical energy storage power station is not more than a first preset multiple of rated current of the energy storage grid-connected converter, and if the positive sequence current component is not more than the first preset multiple of the rated current of the energy storage grid-connected converter, determining whether the outlet short-circuit current reactive component of the energy storage unit meets preset standards and preset precision requirements;
and if so, packaging the electromagnetic transient simulation typical data model as an electromagnetic transient simulation model of the electrochemical energy storage power station to complete modeling.
Optionally, the access grid near zone includes a plurality of energy storage units.
Optionally, after the electromagnetic transient simulation typical data model is established, setting a typical control mode and a fault ride-through strategy of an energy storage grid-connected converter control system of the electromagnetic transient simulation typical data model.
Optionally, if the fault current is a negative sequence component, a negative sequence suppression link is added in the current control link of the time domain simulation energy storage unit to suppress the negative sequence component occurring during the single-phase/three-phase fault.
Optionally, if the positive sequence current component of the short circuit current component of the energy storage unit outlet in the electrochemical energy storage power station is larger than the second preset multiple of the rated current of the energy storage grid-connected converter, adding a positive sequence limiting link in the time domain simulation energy storage unit current control link so as to inhibit abnormal current peaks occurring in the fault period.
Optionally, the second preset multiple is set to 1.1-1.2 times.
Optionally, if the reactive component of the energy storage unit outlet short-circuit current does not meet the preset standard, adding an active-reactive current low-pass control strategy in the time domain simulation energy storage unit current control link so as to provide reactive voltage support for the power grid.
Optionally, if the reactive component of the short-circuit current at the outlet of the energy storage unit does not meet the preset precision requirement, replacing the fault condition of the single-phase/three-phase short-circuit fault during the time domain simulation, and performing the time domain simulation of the single-phase/three-phase short-circuit fault again.
Optionally, the first preset multiple is 1.1 times.
In yet another aspect, the present invention also provides an electromagnetic transient simulation modeling system for an electrochemical energy storage power station, comprising:
the initial unit is used for acquiring basic data of the electrochemical energy storage power station and the near-area of the access power grid, and establishing an electromagnetic transient simulation typical data model of the electrochemical energy storage power station and the near-area of the access power grid according to the basic data;
the analysis unit is used for carrying out single-phase/three-phase short circuit fault time domain simulation on the electromagnetic transient simulation typical data model in the near region of the electrochemical energy storage power station to obtain time domain simulation data, determining fault current of the single-phase/three-phase short circuit fault based on the time domain simulation data, if the fault current is a positive sequence component, determining whether a positive sequence current component of an outlet short circuit current component of an energy storage unit in the electrochemical energy storage power station is not more than a first preset multiple of rated current of the energy storage grid-connected converter, and if the positive sequence current component is not more than the first preset multiple of the rated current of the energy storage grid-connected converter, determining whether the outlet short circuit current reactive component of the energy storage unit meets preset standards and preset precision requirements;
and the modeling unit is used for packaging the electromagnetic transient simulation typical data model as an electromagnetic transient simulation model of the electrochemical energy storage power station when the reactive component of the outlet short-circuit current of the energy storage unit meets the preset standard and the preset precision requirement, so as to complete modeling.
Optionally, the access grid near zone includes a plurality of energy storage units.
Optionally, after the electromagnetic transient simulation typical data model is established, setting a typical control mode and a fault ride-through strategy of an energy storage grid-connected converter control system of the electromagnetic transient simulation typical data model.
Optionally, if the fault current is a negative sequence component, a negative sequence suppression link is added in the current control link of the time domain simulation energy storage unit to suppress the negative sequence component occurring during the single-phase/three-phase fault.
Optionally, if the positive sequence current component of the short circuit current component of the energy storage unit outlet in the electrochemical energy storage power station is larger than the second preset multiple of the rated current of the energy storage grid-connected converter, adding a positive sequence limiting link in the time domain simulation energy storage unit current control link so as to inhibit abnormal current peaks occurring in the fault period.
Optionally, the second preset multiple is set to 1.1-1.2 times.
Optionally, if the reactive component of the energy storage unit outlet short-circuit current does not meet the preset standard, adding an active-reactive current low-pass control strategy in the time domain simulation energy storage unit current control link so as to provide reactive voltage support for the power grid.
Optionally, if the reactive component of the short-circuit current at the outlet of the energy storage unit does not meet the preset precision requirement, replacing the fault condition of the single-phase/three-phase short-circuit fault during the time domain simulation, and performing the time domain simulation of the single-phase/three-phase short-circuit fault again.
Optionally, the first preset multiple is 1.1 times.
In yet another aspect, the present invention also provides a computing device comprising: one or more processors;
a processor for executing one or more programs;
the method as described above is implemented when the one or more programs are executed by the one or more processors.
In yet another aspect, the present invention also provides a computer readable storage medium having stored thereon a computer program which, when executed, implements a method as described above.
Compared with the prior art, the invention has the beneficial effects that:
the invention provides an electromagnetic transient simulation modeling method for an electrochemical energy storage power station, which comprises the following steps: basic data of an electrochemical energy storage power station and an access power grid near zone are obtained, and an electromagnetic transient simulation typical data model of the electrochemical energy storage power station and the access power grid near zone is established according to the basic data; performing single-phase/three-phase short-circuit fault time domain simulation of the near zone of the electrochemical energy storage power station on the electromagnetic transient simulation typical data model to obtain time domain simulation data, determining fault current of the single-phase/three-phase short-circuit fault based on the time domain simulation data, if the fault current is a positive sequence component, determining whether the positive sequence current component of an outlet short-circuit current component of an energy storage unit in the electrochemical energy storage power station is not more than a first preset multiple of rated current of the energy storage grid-connected converter, and if the positive sequence current component is not more than the first preset multiple of the rated current of the energy storage grid-connected converter, determining whether the outlet short-circuit current reactive component of the energy storage unit meets preset standards and preset precision requirements; and if so, packaging the electromagnetic transient simulation typical data model as an electromagnetic transient simulation model of the electrochemical energy storage power station to complete modeling. According to the invention, on the basis of meeting the general requirements of modeling of electrochemical energy storage equipment, the model parameters related to analysis of short-circuit current of each energy storage equipment unit in the energy storage power station can be adjusted through electromagnetic transient iterative simulation of near-area alternating current faults of the energy storage power station according to related operation requirements such as national standards, so that the refined analysis of near-area short-circuit current of the parallel grid of the energy storage power station is realized.
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FIG. 1 is a flow chart of the method of the present invention;
FIG. 2 is a flow chart of an embodiment of the method of the present invention;
fig. 3 is a block diagram of the system of the present invention.
Detailed Description
The exemplary embodiments of the present invention will now be described with reference to the accompanying drawings, however, the present invention may be embodied in many different forms and is not limited to the examples described herein, which are provided to fully and completely disclose the present invention and fully convey the scope of the invention to those skilled in the art. The terminology used in the exemplary embodiments illustrated in the accompanying drawings is not intended to be limiting of the invention. In the drawings, like elements/components are referred to by like reference numerals.
Unless otherwise indicated, terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art. In addition, it will be understood that terms defined in commonly used dictionaries should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense.
Example 1:
the invention provides an electromagnetic transient simulation modeling method for an electrochemical energy storage power station, which is shown in figure 1 and comprises the following steps:
step 1, basic data of an electrochemical energy storage power station and an access power grid near zone are obtained, and an electromagnetic transient simulation typical data model of the electrochemical energy storage power station and the access power grid near zone is established according to the basic data;
step 2, performing single-phase/three-phase short circuit fault time domain simulation of the near zone of the electrochemical energy storage power station on the electromagnetic transient simulation typical data model to obtain time domain simulation data, determining fault current of the single-phase/three-phase short circuit fault based on the time domain simulation data, if the fault current is a positive sequence component, determining whether a positive sequence current component of an outlet short circuit current component of an energy storage unit in the electrochemical energy storage power station is not more than a first preset multiple of rated current of the energy storage grid-connected converter, and if the positive sequence current component is not more than the first preset multiple of the rated current of the energy storage grid-connected converter, determining whether the outlet short circuit current reactive component of the energy storage unit meets preset standards and preset precision requirements;
and step 3, if the electromagnetic transient simulation typical data model is met, packaging the electromagnetic transient simulation typical data model serving as an electromagnetic transient simulation model of the electrochemical energy storage power station to complete modeling.
The access power grid near zone comprises a plurality of energy storage units.
After an electromagnetic transient simulation typical data model is established, setting a typical control mode and a fault ride-through strategy of an energy storage grid-connected converter control system of the electromagnetic transient simulation typical data model.
If the fault current is a negative sequence component, a negative sequence suppression link is added in a time domain simulation energy storage unit current control link so as to suppress the negative sequence component occurring in the single-phase/three-phase fault period.
If the positive sequence current component of the outlet short circuit current component of the energy storage unit in the electrochemical energy storage power station is larger than a second preset multiple of the rated current of the energy storage grid-connected converter, a positive sequence limiting link is added in a time domain simulation energy storage unit current control link so as to inhibit abnormal current peaks occurring in the fault period.
Wherein the second preset multiple is set to 1.1-1.2 times.
And if the reactive component of the energy storage unit outlet short-circuit current does not meet the preset standard, adding an active-reactive current low-pass control strategy in a time domain simulation energy storage unit current control link so as to provide reactive voltage support for a power grid.
If the reactive component of the short-circuit current at the outlet of the energy storage unit does not meet the preset precision requirement, the fault condition of the single-phase/three-phase short-circuit fault during time domain simulation is replaced, and the time domain simulation of the single-phase/three-phase short-circuit fault is performed again.
Wherein the first preset multiple is 1.1 times.
Further description is provided below in connection with specific implementations:
the implementation steps are shown in fig. 2, and include the following steps:
step 1: establishing a typical electromagnetic transient simulation model of the electrochemical energy storage equipment, and setting a typical control mode and a fault ride-through strategy of an energy storage grid-connected converter control system;
step 2: establishing an electromagnetic transient simulation typical data model of an energy storage power station comprising a plurality of electrochemical energy storage equipment units, which is accessed to a near-area power grid;
step 3: performing near-zone single-phase/three-phase short-circuit fault time domain simulation of the energy storage power station, analyzing fault current characteristics, if the fault current has a negative sequence component, turning to step 4, otherwise turning to step 5
Step 4: and adding a negative sequence suppression link in the energy storage equipment unit current control link to suppress negative sequence current components occurring during single-phase/three-phase faults.
Step 5: and (3) analyzing a positive sequence current component of the outlet short-circuit current component of the electrochemical energy storage unit, if the positive sequence component is larger than 1.1 times of rated current of the energy storage grid-connected converter, turning to the step (6), otherwise turning to the step (7).
Step 6: adding a positive sequence limiting link in the current control link of the energy storage unit, wherein the limiting multiple is set to be 1.1-1.2 times so as to inhibit abnormal current peaks during faults; or the limiting multiple is set to provide a fixed value for an energy storage manufacturer so as to ensure the safety of the equipment body of the energy storage converter during fault ride-through.
Step 7: analyzing the positive sequence reactive component of the outlet current of the energy storage unit, and judging whether the low-pass reactive support capability requirement of the national standard GB/T34120-2017 technical Specification of an energy storage converter of an electrochemical energy storage system is met, wherein the requirement of the step 8 is not met, and the step 9 is met;
step 8: an active-reactive (d-q axis) current low-penetration control strategy is added in an energy storage device unit current control link to provide reactive voltage support for a power grid.
Step 9: judging whether the short-circuit current analysis precision requirement is met, if not, replacing the short-circuit fault condition setting and the fault position in the step 3, and iterating the simulation analysis; if so, go to step 10.
Step 10: and (3) completing electromagnetic transient modeling of the electrochemical energy storage equipment, packaging an electromagnetic transient simulation model of the electrochemical energy storage equipment unit and the multi-equipment grid-connected station, and ending the method.
According to the invention, on the basis of meeting the general requirements of modeling of electrochemical energy storage equipment, the model parameters related to analysis of short-circuit current of each energy storage equipment unit in the energy storage power station can be adjusted through electromagnetic transient iterative simulation of near-area alternating current faults of the energy storage power station according to related operation requirements such as national standards, so that the refined analysis of near-area short-circuit current of the parallel grid of the energy storage power station is realized.
Example 2:
the invention also proposes an electromagnetic transient simulation modeling system 200 for an electrochemical energy storage power station, as shown in fig. 3, comprising:
the initial unit 201 is configured to obtain basic data of an electrochemical energy storage power station and an access power grid near zone, and establish an electromagnetic transient simulation typical data model of the electrochemical energy storage power station and the access power grid near zone according to the basic data;
the analysis unit 202 is configured to perform time domain simulation of the single-phase/three-phase short circuit fault in the near region of the electrochemical energy storage power station on the electromagnetic transient simulation typical data model to obtain time domain simulation data, determine a fault current of the single-phase/three-phase short circuit fault based on the time domain simulation data, determine whether a positive sequence current component of an outlet short circuit current component of an energy storage unit in the electrochemical energy storage power station is not greater than a first preset multiple of a rated current of the energy storage grid-connected inverter if the fault current is a positive sequence component, and determine whether the outlet short circuit current reactive component of the energy storage unit meets a preset standard and a preset precision requirement if the positive sequence current component is not greater than the first preset multiple of the rated current of the energy storage grid-connected inverter;
and the modeling unit 203 is configured to encapsulate the electromagnetic transient simulation typical data model as an electromagnetic transient simulation model of the electrochemical energy storage power station when it is determined that the reactive component of the energy storage unit outlet short-circuit current meets a preset standard and a preset precision requirement, so as to complete modeling.
The access power grid near zone comprises a plurality of energy storage units.
After an electromagnetic transient simulation typical data model is established, setting a typical control mode and a fault ride-through strategy of an energy storage grid-connected converter control system of the electromagnetic transient simulation typical data model.
If the fault current is a negative sequence component, a negative sequence suppression link is added in a time domain simulation energy storage unit current control link so as to suppress the negative sequence component occurring in the single-phase/three-phase fault period.
If the positive sequence current component of the outlet short circuit current component of the energy storage unit in the electrochemical energy storage power station is larger than a second preset multiple of the rated current of the energy storage grid-connected converter, a positive sequence limiting link is added in a time domain simulation energy storage unit current control link so as to inhibit abnormal current peaks occurring in the fault period.
Wherein the second preset multiple is set to 1.1-1.2 times.
And if the reactive component of the energy storage unit outlet short-circuit current does not meet the preset standard, adding an active-reactive current low-pass control strategy in a time domain simulation energy storage unit current control link so as to provide reactive voltage support for a power grid.
If the reactive component of the short-circuit current at the outlet of the energy storage unit does not meet the preset precision requirement, the fault condition of the single-phase/three-phase short-circuit fault during time domain simulation is replaced, and the time domain simulation of the single-phase/three-phase short-circuit fault is performed again.
Wherein the first preset multiple is 1.1 times.
Example 3:
based on the same inventive concept, the invention also provides a computer device comprising a processor and a memory for storing a computer program comprising program instructions, the processor for executing the program instructions stored by the computer storage medium. The processor may be a central processing unit (Central Processing Unit, CPU), but may also be other general purpose processors, digital signal processors (Digital Signal Processor, DSP), application specific integrated circuits (Application SpecificIntegrated Circuit, ASIC), off-the-shelf Programmable gate arrays (FPGAs) or other Programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc., which are the computational core and control core of the terminal adapted to implement one or more instructions, in particular adapted to load and execute one or more instructions within a computer storage medium to implement the corresponding method flow or corresponding functions to implement the steps of the method in the embodiments described above.
Example 4:
based on the same inventive concept, the present invention also provides a storage medium, in particular, a computer readable storage medium (Memory), which is a Memory device in a computer device, for storing programs and data. It is understood that the computer readable storage medium herein may include both built-in storage media in a computer device and extended storage media supported by the computer device. The computer-readable storage medium provides a storage space storing an operating system of the terminal. Also stored in the memory space are one or more instructions, which may be one or more computer programs (including program code), adapted to be loaded and executed by the processor. The computer readable storage medium herein may be a high-speed RAM memory or a non-volatile memory (non-volatile memory), such as at least one magnetic disk memory. One or more instructions stored in a computer-readable storage medium may be loaded and executed by a processor to implement the steps of the methods in the above-described embodiments.
It will be appreciated by those skilled in the art that embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein. The scheme in the embodiment of the invention can be realized by adopting various computer languages, such as object-oriented programming language Java, an transliteration script language JavaScript and the like.
The present 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 flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may 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, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. It is therefore intended that the following claims be interpreted as including the preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various modifications and variations can be made to the present invention without departing from the spirit or scope of the invention. Thus, it is intended that the present invention also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.
Claims (20)
1. An electromagnetic transient simulation modeling method for an electrochemical energy storage power station, the method comprising:
basic data of an electrochemical energy storage power station and an access power grid near zone are obtained, and an electromagnetic transient simulation typical data model of the electrochemical energy storage power station and the access power grid near zone is established according to the basic data;
performing single-phase/three-phase short-circuit fault time domain simulation of the near zone of the electrochemical energy storage power station on the electromagnetic transient simulation typical data model to obtain time domain simulation data, determining fault current of the single-phase/three-phase short-circuit fault based on the time domain simulation data, if the fault current is a positive sequence component, determining whether the positive sequence current component of an outlet short-circuit current component of an energy storage unit in the electrochemical energy storage power station is not more than a first preset multiple of rated current of the energy storage grid-connected converter, and if the positive sequence current component is not more than the first preset multiple of the rated current of the energy storage grid-connected converter, determining whether the outlet short-circuit current reactive component of the energy storage unit meets preset standards and preset precision requirements;
and if so, packaging the electromagnetic transient simulation typical data model as an electromagnetic transient simulation model of the electrochemical energy storage power station to complete modeling.
2. The method of claim 1, the access grid proximity comprising a plurality of energy storage units.
3. The method of claim 1, wherein after the electromagnetic transient simulation typical data model is established, a typical control mode and a fault ride-through strategy of an energy storage grid-connected converter control system of the electromagnetic transient simulation typical data model are set.
4. The method of claim 1, wherein if the fault current is a negative sequence component, adding a negative sequence suppression element to the time domain simulated energy storage cell current control element to suppress the negative sequence component occurring during a single phase/three phase fault.
5. The method of claim 1, wherein if the positive sequence current component of the energy storage cell outlet short circuit current component in the electrochemical energy storage power station is greater than a second preset multiple of the rated current of the energy storage grid-connected inverter, adding a positive sequence clipping element in the time domain simulation energy storage cell current control element to suppress abnormal current peaks occurring during the fault.
6. The method of claim 5, wherein the second predetermined multiple is set to 1.1-1.2 times.
7. The method of claim 1, wherein if the energy storage unit outlet short circuit current reactive component does not meet a preset criterion, adding an active-reactive current low pass control strategy to the time domain simulated energy storage unit current control link to provide reactive voltage support to the power grid.
8. The method according to claim 1, wherein if the reactive component of the energy storage unit outlet short-circuit current does not meet the preset accuracy requirement, the fault condition of the single-phase/three-phase short-circuit fault during the time domain simulation is replaced, and the time domain simulation of the single-phase/three-phase short-circuit fault is performed again.
9. The method of claim 1, wherein the first predetermined multiple is 1.1 times.
10. An electromagnetic transient simulation modeling system for an electrochemical energy storage power station, the system comprising:
the initial unit is used for acquiring basic data of the electrochemical energy storage power station and the near-area of the access power grid, and establishing an electromagnetic transient simulation typical data model of the electrochemical energy storage power station and the near-area of the access power grid according to the basic data;
the analysis unit is used for carrying out single-phase/three-phase short circuit fault time domain simulation on the electromagnetic transient simulation typical data model in the near region of the electrochemical energy storage power station to obtain time domain simulation data, determining fault current of the single-phase/three-phase short circuit fault based on the time domain simulation data, if the fault current is a positive sequence component, determining whether a positive sequence current component of an outlet short circuit current component of an energy storage unit in the electrochemical energy storage power station is not more than a first preset multiple of rated current of the energy storage grid-connected converter, and if the positive sequence current component is not more than the first preset multiple of the rated current of the energy storage grid-connected converter, determining whether the outlet short circuit current reactive component of the energy storage unit meets preset standards and preset precision requirements;
and the modeling unit is used for packaging the electromagnetic transient simulation typical data model as an electromagnetic transient simulation model of the electrochemical energy storage power station when the reactive component of the outlet short-circuit current of the energy storage unit meets the preset standard and the preset precision requirement, so as to complete modeling.
11. The system of claim 10, the access grid proximity comprising a plurality of energy storage units.
12. The system of claim 10, wherein after the electromagnetic transient simulation typical data model is established, a typical control mode and a fault ride-through strategy of an energy storage grid-connected converter control system of the electromagnetic transient simulation typical data model are set.
13. The system of claim 10, wherein if the fault current is a negative sequence component, a negative sequence suppression element is added to the time domain simulated energy storage cell current control element to suppress the negative sequence component occurring during a single phase/three phase fault.
14. The system of claim 10, wherein if the positive sequence current component of the energy storage cell outlet short circuit current component in the electrochemical energy storage power station is greater than a second preset multiple of the rated current of the energy storage grid-connected inverter, adding a positive sequence clipping element to the time domain simulated energy storage cell current control element to suppress abnormal current peaks occurring during the fault.
15. The system of claim 14, wherein the second predetermined multiple is set to 1.1-1.2 times.
16. The system of claim 10, wherein if the energy storage unit outlet short circuit current reactive component does not meet a preset criterion, then adding an active-reactive current low pass control strategy to the time domain simulated energy storage unit current control link to provide reactive voltage support to the power grid.
17. The system of claim 10, wherein if the reactive component of the energy storage unit outlet short circuit current does not meet the preset accuracy requirement, the fault condition of the single-phase/three-phase short circuit fault during the time domain simulation is replaced, and the time domain simulation of the single-phase/three-phase short circuit fault is performed again.
18. The system of claim 10, wherein the first predetermined multiple is 1.1 times.
19. A computer device, comprising:
one or more processors;
a processor for executing one or more programs;
the method of any of claims 1-9 is implemented when the one or more programs are executed by the one or more processors.
20. A computer readable storage medium, characterized in that a computer program is stored thereon, which computer program, when executed, implements the method according to any of claims 1-9.
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