A large-scale electromagnetic transient simulation method and system for new energy stations

Abstract

The present invention discloses a method and system for simulating electromagnetic transients at large-scale renewable energy stations. The method comprises: determining simulation parameters, connecting a controllable voltage source, and testing the high and low penetration limits of a single renewable energy model and a single SVG model by modifying the voltage source amplitude; modifying the single renewable energy model and the single SVG model to determine a renewable energy grid electromagnetic model and a single renewable energy station model; integrating renewable energy stations based on the renewable energy grid electromagnetic model and the single renewable energy station model; and simulating electromagnetic transients based on the renewable energy stations. This improves the efficiency and accuracy of electromagnetic transient modeling for large-scale renewable energy stations.

Description

Technical Field

[0001] The present invention relates to the field of digital simulation of power systems, and more specifically, to a method and system for electromagnetic transient simulation of large-scale new energy stations. Background Art

[0002] To accurately describe the physical characteristics of current large-scale renewable energy transmission systems via ultra-high voltage (UHV) transmission, there is an urgent need to implement large-scale renewable energy electromagnetic transient offline simulation suitable for large-scale power grid analysis. Renewable energy generation systems are a crucial component of the power grid, primarily consisting of power supplies, power electronic converters, and control systems. Their dynamic characteristics are not solely determined by the inherent characteristics of the power model; the power electronic converters and control systems also play a vital role in the operation of renewable energy generation systems. Intercoupled electromagnetic transient processes exist between various devices. Therefore, it is necessary to use manufacturer-developed, single-machine digital models of renewable energy that match the actual equipment, and to employ the actual renewable energy site topology. Large-scale electromagnetic transient simulation of renewable energy sites involves multiple manufacturer models and a large number of electrical nodes, resulting in a significant modeling workload. Summary of the Invention

[0003] According to the present invention, a large-scale new energy station electromagnetic transient simulation method and system are provided to solve the technical problem that large-scale new energy station electromagnetic transient simulation involves multiple manufacturers' models, large-scale electrical nodes, and a huge modeling workload.

[0004] According to a first aspect of the present invention, a method for electromagnetic transient simulation of a large-scale new energy station is provided, comprising:

[0005] Determine the simulation parameters, connect a controllable voltage source, and test the high and low penetration limits of the new energy stand-alone model and the SVG stand-alone model by modifying the voltage source amplitude.

[0006] Respectively transforming the new energy stand-alone model and the SVG stand-alone model to determine a new energy grid electromagnetic model and a single new energy station model;

[0007] Integrating new energy stations according to the new energy grid electromagnetic model and the single new energy station model;

[0008] According to the new energy station, electromagnetic transients are simulated.

[0009] Optionally, the new energy stand-alone model and the SVG stand-alone model are modified respectively to determine the new energy grid electromagnetic model and the single new energy station model, including:

[0010] Respectively transforming the new energy stand-alone model and the SVG stand-alone model to convert the electromechanical transient data of the new energy grid into an electromagnetic model of the new energy grid;

[0011] A single new energy station model is established and tested.

[0012] Optionally, the new energy stand-alone model is modified, including:

[0013] Startup, high and low wear enable, and simultaneous rate use slope rise, and the start rise time, rise rate, and target value are set as global parameters;

[0014] Add a multiplication interface component on the high-voltage side of the new energy single-unit model box transformer and set the multiplication coefficient according to the rated capacity of the single station;

[0015] Add a measurement module, add the prefix of the new energy model to the printed variable name, and confirm that the power of a single machine is normal after multiplication.

[0016] Optionally, the SVG standalone model is modified, including:

[0017] Startup, high and low pass enable, multiple control mode enable and their switching time, and control target value of each control mode are set as global parameters.

[0018] Optionally, establishing a single new energy station model and testing the single new energy station model includes:

[0019] Importing the SVG stand-alone model and the new energy stand-alone model;

[0020] If the SVG stand-alone model contains a boost transformer, retain the boost transformer component;

[0021] Determine the 35kV bus voltage reference value of the boost transformer and the new energy unit, based on the 35kV bus reference voltage of the SVG;

[0022] Modify the reference voltage of the busbar connected to the high-voltage side of the box-type transformer in the new energy single-unit model, the reference voltage on the low-voltage side of the step-up transformer, and the resistance and leakage reactance on the low-voltage side. Modify the SVG capacity and SVG connection points according to the collected funds. Connect a constant voltage source to the system side through a switch, with the same amplitude and phase angle as the current.

[0023] Determine that the reactive power output of the SVG complies with the control mode and target value settings, and that the station output power is the same as the sum of the generator power flows corresponding to the new energy station.

[0024] Optionally, integrating the new energy stations according to the new energy grid electromagnetic model and the single new energy station model includes:

[0025] In the electromagnetic model of the new energy grid, the import project to subcircuit function is used to merge the models of each single new energy station into the corresponding position;

[0026] According to the new energy station, the switch is connected to the new energy grid, the state is closed, and the switch for connecting the station to the voltage source is changed to open;

[0027] A constant voltage source is connected to the busbar connected to the DC, and each station operates normally in a steady state.

[0028] According to another aspect of the present invention, a large-scale new energy station electromagnetic transient simulation system is provided, comprising:

[0029] The stand-alone model test module is used to determine simulation parameters, connect a controllable voltage source, and test the high and low penetration limits of the new energy stand-alone model and the SVG stand-alone model by modifying the voltage source amplitude;

[0030] Determine a new energy model module, which is used to transform the new energy stand-alone model and the SVG stand-alone model respectively, and determine a new energy grid electromagnetic model and a single new energy station model;

[0031] An integrated new energy station module, configured to integrate new energy stations based on the new energy grid electromagnetic model and the single new energy station model;

[0032] The electromagnetic transient simulation module is used to simulate electromagnetic transients according to the new energy station.

[0033] Optionally, determining a new energy model module includes:

[0034] Determining a new energy grid electromagnetic model module, for respectively transforming the new energy stand-alone model and the SVG stand-alone model, and converting the electromechanical transient data of the new energy grid into the new energy grid electromagnetic model;

[0035] A single new energy station model module is established to establish a single new energy station model and test the single new energy station model.

[0036] Optionally, determining a new energy grid electromagnetic model module for transforming the new energy stand-alone model includes:

[0037] Set the new energy global parameter submodule, start the machine, enable high and low wear, and use the slope rise method for the simultaneous rate, and set the start rise time, rise rate, and target value as global parameters;

[0038] The multiplication coefficient submodule is used to add a multiplication interface component on the high-voltage side of the new energy single-machine model box transformer and set the multiplication coefficient according to the rated capacity of the single station;

[0039] Add a measurement module to print variable names with the prefix of new energy models to confirm that the power of a single machine is normal after multiplication.

[0040] Optionally, determining a new energy grid electromagnetic model module for transforming the SVG standalone model includes:

[0041] Set the SVG global parameter submodule, which is used for startup, high and low pass-through enable, multiple control modes enable and their switching time, and set the control target value of each control mode as global parameters.

[0042] Optionally, a single new energy station model module is established, including:

[0043] The stand-alone model import submodule is used to import the SVG stand-alone model and the new energy stand-alone model;

[0044] A submodule for retaining a boost transformer element is used to retain the boost transformer element if the SVG stand-alone model includes a boost transformer;

[0045] Determine the reference bus submodule, used to determine the 35kV bus voltage reference value of the boost transformer and the new energy unit based on the 35kV bus reference voltage of the SVG;

[0046] The parameter modification submodule is used to modify the reference voltage of the busbar connected to the high-voltage side of the box-type transformer, the reference voltage on the low-voltage side of the step-up transformer, and the resistance and leakage reactance on the low-voltage side in the new energy single-machine model. The SVG capacity is modified according to the collected funds, and the SVG connection point is modified. The system side is connected to a constant voltage source through a switch, and the amplitude and phase angle are the same as the current.

[0047] The submodule for determining the same sum is used to determine whether the reactive power output of the SVG complies with the control mode and target value settings, and whether the station output power is the same as the sum of the generator power flow corresponding to the new energy station.

[0048] Optionally, integrate new energy station modules, including:

[0049] The submodule for merging to corresponding positions is used to merge the models of the single new energy stations to corresponding positions in the electromagnetic model of the new energy grid by using the function of importing the project into the subcircuit;

[0050] A state modification submodule is used to modify the state of the station connected to the new energy grid through the switch to be disconnected according to the state of the new energy station being connected to the new energy grid through the switch, and the state is closed;

[0051] The normal operation submodule is used to connect the busbar connected to the DC with a constant voltage source to ensure that each station is operating normally in a steady state. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] A more complete understanding of exemplary embodiments of the present invention may be obtained by referring to the following drawings:

[0053] Figure 1Schematic diagram of a process of electromagnetic transient simulation method for a large-scale new energy station according to this embodiment;

[0054] Figure 2 Schematic diagram of the electromagnetic transient model of a large-scale new energy station according to this embodiment;

[0055] Figure 3 This is a schematic diagram of a large-scale electromagnetic transient simulation system for new energy stations described in this embodiment. DETAILED DESCRIPTION

[0056] 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 embodiments described herein. These embodiments are provided to provide a thorough and complete disclosure of the present invention and to fully convey the scope of the present invention to those skilled in the art. The terminology used in the exemplary embodiments shown in the accompanying drawings is not intended to limit the present invention. In the accompanying drawings, identical elements are denoted by the same reference numerals.

[0057] Unless otherwise specified, the terms used herein (including technical terms) have the meanings commonly understood by those skilled in the art. In addition, it is understood that 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.

[0058] According to a first aspect of the present invention, a method 100 is provided, referring to Figure 1 As shown, the method 100 includes:

[0059] S101: Determine simulation parameters, connect a controllable voltage source, and test the high and low wear limits of a new energy stand-alone model and a SVG stand-alone model by modifying the voltage source amplitude;

[0060] S102: Transforming the new energy stand-alone model and the SVG stand-alone model respectively to determine a new energy grid electromagnetic model and a single new energy station model;

[0061] S103: Integrating new energy stations according to the new energy grid electromagnetic model and the single new energy station model;

[0062] S104: Simulate electromagnetic transients according to the new energy station.

[0063] Specifically, the capabilities of the new energy manufacturers supporting new energy stations vary widely. The stand-alone models submitted by these manufacturers suffer from issues such as inability to start calculations properly, instability during long-term operation, and inconsistencies between the models provided by the manufacturers and the test reports. This results in an unmanageable workload for the first phase of new energy stand-alone testing. This paper proposes verifying the accuracy of the manufacturer's model through several key tests. While ensuring the accuracy of the electromagnetic transient simulation results for the new energy stand-alone machine, it replaces the actual manufacturer model with a similar manufacturer model, improving modeling efficiency and accuracy.

[0064] The electromechanical transient data of the new energy grid has problems with transformer parameters and topology. The present invention addresses the problem of unreasonable electromechanical transient data of the new energy grid and proposes a method for correcting the data on the basis of ensuring the accuracy of the electromagnetic transient simulation results of the new energy stand-alone machine.

[0065] refer to Figure 2 As shown, the present invention proposes a large-scale new energy station electromagnetic transient simulation method, which specifically includes the following steps:

[0066] Phase 1: New energy stand-alone and SVG stand-alone testing.

[0067] Key test points include:

[0068] (1) Under the lowest short-circuit ratio condition, the simulation parameters are set to be the same as those of the connected DC electromagnetic transient model. A controllable voltage source is connected to the system side. By modifying the voltage source amplitude, the high and low penetration limits of new energy and SVG units are measured, which are required to be consistent with the limits provided by the manufacturer.

[0069] (2) Based on the example in step (1), the calculation time is set to 100s. The simulation results of Windows local and Linux background are compared. It is required that the power and voltage curves are consistent, and in the steady state, there is no abnormal jitter and oscillation in the power and voltage.

[0070] Phase II: Modeling and testing of single new energy stations

[0071] (1) New energy and SVG single machine transformation

[0072] 1) Transformation of new energy single-machine model: Start-up, high and low pass-through enable, and simultaneous rate adopt slope increase, and the start rise time, rise rate and target value are set as global parameters; add a multiplication interface component on the high-voltage side of the new energy single-machine model box-type transformer, and set the multiplication coefficient according to the rated capacity of the single station; add a measurement module, add the prefix of the new energy model abbreviation to the printed variable name, and require the power of the single machine to be normal after multiplication.

[0073] 2) SVG model transformation: Startup, high and low wear enable, multiple control modes enable and their switching time, and control target value of each control mode are set as global parameters.

[0074] (2) Electromagnetic modeling of new energy grid (excluding new energy units): Convert the electromechanical transient data of the new energy grid into an electromagnetic model, mainly including the station step-up transformer, station outgoing line, etc., but excluding the electromagnetic model of the new energy unit.

[0075] (3) Modeling and testing of a single renewable energy station: A renewable energy unit belonging to a boost transformer is equivalent to an electromagnetic model of a renewable energy station. The specific steps are as follows:

[0076] 1) New construction projects;

[0077] 2) Import the SVG monomer model, prefixed with the manufacturer's name, such as "TB_SVG_";

[0078] 3) Import the new energy stand-alone model with the prefix of the new energy stand-alone type and manufacturer name, such as "DF_YJ_".

[0079] Note: ① If the SVG stand-alone model contains a step-up transformer, to avoid re-association, retain the step-up transformer component and copy the step-up transformer parameters from the corresponding transformer in the new energy grid (use the right-click component copy parameter function), paying attention to the voltage levels of the primary and secondary connections; ② The 35kV busbar voltage reference value of the step-up transformer and new energy stand-alone unit shall be based on the 35kV busbar reference voltage of the SVG. Modify the reference voltage of the busbar connected to the high-voltage side of the box-type transformer in the new energy stand-alone unit, the low-voltage side reference voltage of the step-up transformer component, and the low-voltage side resistance and leakage reactance. Modify the SVG capacity according to the collected funds, modify the SVG association point, and connect the constant voltage source through a switch on the system side with the same amplitude and phase angle as the power flow. Requirements: The SVG output reactive power complies with the control mode and target value settings, and the station output power is the same as the sum of the generator power flows corresponding to the new energy station.

[0080] Phase 3: New Energy Station Integration

[0081] (1) In the electromagnetic model of the new energy grid (excluding new energy units), use the import project to subcircuit function to merge the models of each single new energy station into the corresponding position. It is recommended to add a prefix to each station when importing: station name (first letter of pinyin), such as "ZXQ_"; the station is connected to the new energy grid through a switch (the text part of the switch name is changed to BrkSys), the state is closed, and the station connection voltage source switch is changed to open; the naming rule of each station subcircuit is: Chinese station name_DF / DD / PV_new energy manufacturer name (first letter of pinyin)_SVG_SVG manufacturer name (first letter of pinyin)_, such as "Zhangxian District_PV_HW_SVG_XFG";

[0082] (2) Only the constant voltage source is connected to the busbar connected to the DC, and each station operates normally in a steady state.

[0083] Therefore, the electromagnetic transient simulation method of a large-scale new energy station proposed in the present invention solves the problems of uneven quality of models of new energy manufacturers supporting new energy stations and transformer parameters and topology of new energy grid data in the electromagnetic transient modeling process of large-scale new energy stations, thereby improving the efficiency and accuracy of electromagnetic transient modeling of large-scale new energy stations.

[0084] Optionally, the new energy stand-alone model and the SVG stand-alone model are modified respectively to determine the new energy grid electromagnetic model and the single new energy station model, including:

[0085] Respectively transforming the new energy stand-alone model and the SVG stand-alone model to convert the electromechanical transient data of the new energy grid into an electromagnetic model of the new energy grid;

[0086] A single new energy station model is established and tested.

[0087] Optionally, the new energy stand-alone model is modified, including:

[0088] Startup, high and low wear enable, and simultaneous rate use slope rise, and the start rise time, rise rate, and target value are set as global parameters;

[0089] Add a multiplication interface component on the high-voltage side of the new energy single-unit model box transformer and set the multiplication coefficient according to the rated capacity of the single station;

[0090] Add a measurement module, add the prefix of the new energy model to the printed variable name, and confirm that the power of a single machine is normal after multiplication.

[0091] Optionally, the SVG standalone model is modified, including:

[0092] Startup, high and low pass enable, multiple control mode enable and their switching time, and control target value of each control mode are set as global parameters.

[0093] Optionally, establishing a single new energy station model and testing the single new energy station model includes:

[0094] Importing the SVG stand-alone model and the new energy stand-alone model;

[0095] If the SVG stand-alone model contains a boost transformer, retain the boost transformer component;

[0096] Determine the 35kV bus voltage reference value of the boost transformer and the new energy unit based on the 35kV bus reference voltage of the SVG;

[0097] Modify the reference voltage of the busbar connected to the high-voltage side of the box-type transformer in the new energy single-unit model, the reference voltage on the low-voltage side of the step-up transformer, and the resistance and leakage reactance on the low-voltage side. Modify the SVG capacity and SVG connection points according to the collected funds. Connect a constant voltage source to the system side through a switch, with the same amplitude and phase angle as the current.

[0098] Determine that the reactive power output of the SVG complies with the control mode and target value settings, and that the station output power is the same as the sum of the generator power flows corresponding to the new energy station.

[0099] Optionally, integrating the new energy stations according to the new energy grid electromagnetic model and the single new energy station model includes:

[0100] In the electromagnetic model of the new energy grid, the import project to subcircuit function is used to merge the models of each single new energy station into the corresponding position;

[0101] According to the new energy station, the switch is connected to the new energy grid, the state is closed, and the switch for connecting the station to the voltage source is changed to open;

[0102] A constant voltage source is connected to the busbar connected to the DC, and each station operates normally in a steady state.

[0103] Therefore, the electromagnetic transient simulation method of a large-scale new energy station proposed in the present invention solves the problems of uneven quality of models of new energy manufacturers supporting new energy stations and transformer parameters and topology of new energy grid data in the electromagnetic transient modeling process of large-scale new energy stations, thereby improving the efficiency and accuracy of electromagnetic transient modeling of large-scale new energy stations.

[0104] According to another aspect of the present invention, a large-scale new energy station electromagnetic transient simulation system 300 is provided. Figure 3 As shown, the system 300 includes:

[0105] The stand-alone model testing module 310 is used to determine simulation parameters, connect a controllable voltage source, and test the high and low wear limits of the new energy stand-alone model and the SVG stand-alone model by modifying the voltage source amplitude;

[0106] A new energy model determination module 320 is used to transform the new energy stand-alone model and the SVG stand-alone model respectively to determine a new energy grid electromagnetic model and a single new energy station model;

[0107] An integrated new energy station module 330 is configured to integrate new energy stations based on the new energy grid electromagnetic model and the single new energy station model;

[0108] The electromagnetic transient simulation module 340 is used to simulate electromagnetic transients according to the new energy station.

[0109] Optionally, determining a new energy model module 320 includes:

[0110] Determining a new energy grid electromagnetic model module, for respectively transforming the new energy stand-alone model and the SVG stand-alone model, and converting the electromechanical transient data of the new energy grid into the new energy grid electromagnetic model;

[0111] A single new energy station model module is established to establish a single new energy station model and test the single new energy station model.

[0112] Optionally, determining a new energy grid electromagnetic model module for transforming the new energy stand-alone model includes:

[0113] Set the new energy global parameter submodule, start the machine, enable high and low wear, and use the slope rise method for the simultaneous rate, and set the start rise time, rise rate, and target value as global parameters;

[0114] The multiplication coefficient submodule is used to add a multiplication interface component on the high-voltage side of the new energy single-machine model box transformer and set the multiplication coefficient according to the rated capacity of the single station;

[0115] Add a measurement module to print variable names with the prefix of new energy models to confirm that the power of a single machine is normal after multiplication.

[0116] Optionally, determining a new energy grid electromagnetic model module for transforming the SVG standalone model includes:

[0117] Set the SVG global parameter submodule, which is used for startup, high and low pass-through enable, multiple control modes enable and their switching time, and set the control target value of each control mode as global parameters.

[0118] Optionally, a single new energy station model module is established, including:

[0119] The stand-alone model import submodule is used to import the SVG stand-alone model and the new energy stand-alone model;

[0120] A submodule for retaining a boost transformer element is used to retain the boost transformer element if the SVG stand-alone model includes a boost transformer;

[0121] Determine the reference bus submodule, used to determine the 35kV bus voltage reference value of the boost transformer and the new energy unit based on the 35kV bus reference voltage of the SVG;

[0122] The parameter modification submodule is used to modify the reference voltage of the busbar connected to the high-voltage side of the box-type transformer, the reference voltage on the low-voltage side of the step-up transformer, and the resistance and leakage reactance on the low-voltage side in the new energy single-machine model. The SVG capacity is modified according to the collected funds, and the SVG connection point is modified. The system side is connected to a constant voltage source through a switch, and the amplitude and phase angle are the same as the current.

[0123] The submodule for determining the same sum is used to determine whether the reactive power output of the SVG complies with the control mode and target value settings, and whether the station output power is the same as the sum of the generator power flow corresponding to the new energy station.

[0124] Optionally, the integrated new energy station module 330 includes:

[0125] The submodule for merging to corresponding positions is used to merge the models of the single new energy stations to corresponding positions in the electromagnetic model of the new energy grid by using the function of importing the project into the subcircuit;

[0126] A state modification submodule is used to modify the state of the station connected to the new energy grid through the switch to be disconnected according to the state of the new energy station being connected to the new energy grid through the switch, and the state is closed;

[0127] The normal operation submodule is used to connect the busbar connected to the DC with a constant voltage source to ensure that each station is operating normally in a steady state.

[0128] A large-scale new energy station electromagnetic transient simulation system 300 according to an embodiment of the present invention corresponds to a large-scale new energy station electromagnetic transient simulation method 100 according to another embodiment of the present invention, and will not be described in detail here.

[0129] 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 application can adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment in combination with software and hardware. Moreover, the 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 embodiment of the present application can be implemented in various computer languages, for example, object-oriented programming language Java and literal translation scripting language JavaScript, etc.

[0130] 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 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 steps in the process. 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.

[0131] These computer program instructions may also be stored in a computer readable memory that can direct a computer or other programmable data processing device to work in a specific manner, so that the instructions stored in the computer readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 a process or multiple processes and / or boxes Figure 1 The function specified in one or more boxes.

[0132] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operational steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing the instructions executed on the computer or other programmable device for implementing the process. Figure 1 a process or multiple processes and / or boxes Figure 1 A step that specifies a function in one or more boxes.

[0133] Although the preferred embodiments of the present application have been described, those skilled in the art may make additional 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 application.

[0134] Obviously, those skilled in the art may make various changes and modifications to this application without departing from the spirit and scope of this application. Thus, if these modifications and variations of this application fall within the scope of the claims of this application and their equivalents, this application is intended to include these modifications and variations.

Claims

1. A large-scale new energy station electromagnetic transient simulation method, characterized in that: include: Determine the simulation parameters, connect a controllable voltage source, and test the high and low penetration limits of the new energy stand-alone model and the SVG stand-alone model by modifying the voltage source amplitude. Respectively transforming the new energy stand-alone model and the SVG stand-alone model to determine a new energy grid electromagnetic model and a single new energy station model; Integrating new energy stations according to the new energy grid electromagnetic model and the single new energy station model; Simulating electromagnetic transients based on the new energy station; The new energy stand-alone model and the SVG stand-alone model are modified respectively to determine the new energy grid electromagnetic model and the single new energy station model, including: Respectively transforming the new energy stand-alone model and the SVG stand-alone model to convert the electromechanical transient data of the new energy grid into an electromagnetic model of the new energy grid; Establishing a single new energy station model and testing the single new energy station model; The new energy stand-alone model is modified, including: Startup, high and low wear enable, and simultaneous rate use slope rise, and the start rise time, rise rate, and target value are set as global parameters; Add a multiplication interface component on the high-voltage side of the new energy single-unit model box transformer and set the multiplication coefficient according to the rated capacity of the single station; Added a measurement module, added the prefix of new energy model to the printed variable name, and confirmed that the power of a single machine is normal after multiplication; The SVG stand-alone model is modified, including: Startup, high and low pass enable, multiple control mode enable and their switching time, and control target value of each control mode are set as global parameters; Establishing a single renewable energy station model and testing the single renewable energy station model, including: Importing the SVG stand-alone model and the new energy stand-alone model; If the SVG stand-alone model contains a boost transformer, retain the boost transformer component; Determine the 35kV bus voltage reference value of the boost transformer and the new energy unit, based on the 35kV bus reference voltage of the SVG; Modify the reference voltage of the busbar connected to the high-voltage side of the box-type transformer in the new energy single-unit model, the reference voltage on the low-voltage side of the step-up transformer, and the resistance and leakage reactance on the low-voltage side. Modify the SVG capacity and SVG connection points according to the collected funds. Connect a constant voltage source to the system side through a switch, with the same amplitude and phase angle as the current. Determine that the reactive power output of the SVG complies with the control mode and target value settings, and that the station output power is the same as the sum of the generator power flows corresponding to the new energy station; Integrating new energy stations according to the new energy grid electromagnetic model and the single new energy station model includes: In the electromagnetic model of the new energy grid, the import project to subcircuit function is used to merge the models of each single new energy station into the corresponding position; According to the new energy station, the switch is connected to the new energy grid, the state is closed, and the switch for connecting the station to the voltage source is changed to open; A constant voltage source is connected to the busbar connected to the DC, and each station operates normally in a steady state.

2. A large-scale electromagnetic transient simulation system for new energy stations, characterized by: include: The stand-alone model test module is used to determine simulation parameters, connect a controllable voltage source, and test the high and low penetration limits of the new energy stand-alone model and the SVG stand-alone model by modifying the voltage source amplitude; Determine a new energy model module, which is used to transform the new energy stand-alone model and the SVG stand-alone model respectively, and determine a new energy grid electromagnetic model and a single new energy station model; An integrated new energy station module, configured to integrate new energy stations based on the new energy grid electromagnetic model and the single new energy station model; An electromagnetic transient simulation module, used for simulating electromagnetic transients according to the new energy station; Identify new energy model modules, including: Determining a new energy grid electromagnetic model module, for respectively transforming the new energy stand-alone model and the SVG stand-alone model, and converting the electromechanical transient data of the new energy grid into the new energy grid electromagnetic model; Establishing a single new energy station model module, used to establish a single new energy station model and test the single new energy station model; Determine a new energy grid electromagnetic model module for transforming the new energy stand-alone model, including: Set the new energy global parameter submodule, start the machine, enable high and low wear, and use the slope rise method for the simultaneous rate, and set the start rise time, rise rate, and target value as global parameters; The multiplication coefficient submodule is used to add a multiplication interface component on the high-voltage side of the new energy single-machine model box transformer and set the multiplication coefficient according to the rated capacity of the single station; Added a measurement module to print variable names with the prefix of new energy models to confirm that the power of a single machine is normal after multiplication; Determine a new energy grid electromagnetic model module for transforming the SVG stand-alone model, including: Set the SVG global parameter submodule, which is used to set the startup, high and low pass-through enable, multiple control mode switching time, and the control target value of each control mode as global parameters; Establish a single new energy station model module, including: The stand-alone model import submodule is used to import the SVG stand-alone model and the new energy stand-alone model; A submodule for retaining a boost transformer element is used to retain the boost transformer element if the SVG stand-alone model includes a boost transformer; Determine the reference bus submodule, used to determine the 35kV bus voltage reference value of the boost transformer and the new energy unit based on the 35kV bus reference voltage of the SVG; The parameter modification submodule is used to modify the reference voltage of the busbar connected to the high-voltage side of the box-type transformer, the reference voltage on the low-voltage side of the step-up transformer, and the resistance and leakage reactance on the low-voltage side in the new energy single-machine model. The SVG capacity is modified according to the collected funds, and the SVG connection point is modified. The system side is connected to a constant voltage source through a switch, and the amplitude and phase angle are the same as the current. A submodule for determining the same sum is used to determine that the reactive power output of the SVG complies with the control mode and target value settings, and that the station output power is the same as the sum of the generator power flows corresponding to the new energy station; Integrated new energy station modules, including: The submodule for merging to corresponding positions is used to merge the models of the single new energy stations to corresponding positions in the electromagnetic model of the new energy grid by using the function of importing the project into the subcircuit; A state modification submodule is used to modify the state of the station connected to the new energy grid through the switch to be disconnected according to the state of the new energy station being connected to the new energy grid through the switch, and the state is closed; The normal operation submodule is used to connect the busbar connected to the DC with a constant voltage source to ensure that each station is operating normally in a steady state.

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