Modeling method and system for electromechanical transient analysis model of new energy system

Abstract

The present invention discloses a modeling method and system for an electromechanical transient analysis model of a new energy system, which divides the electromechanical transient simulation modeling of the new energy system into two parts, a main system and a control system, and models them separately. The main system is modeled by electromechanical transient simulation software using a standard model, and the control system is modeled by the equipment manufacturer using a dynamic link library. This can not only reduce the difficulty and workload of the equipment manufacturer in establishing a dynamic link library model, and achieve completely accurate modeling of the new energy system, but also protect the commercial secrets of the equipment manufacturer, and eliminate the risk of control strategy leakage. This solves the technical problem that the existing electromechanical transient simulation of the new energy system is difficult to accurately model the new energy system when the equipment manufacturer does not disclose the model control strategy, so that the dynamic response of the simulated unit model of the new energy system is the same as that of the actual unit model, resulting in low accuracy of the electromechanical transient simulation results.

Description

Technical Field

[0001] The present invention relates to the technical field of electromechanical transient analysis of power systems, and in particular to a method and system for modeling an electromechanical transient analysis model of a new energy system. Background Art

[0002] Electromechanical transient simulation is one of the most widely used means of calculating the safety and stability of power systems. Against the backdrop of "carbon peak and carbon neutrality", new energy power generation systems such as wind power generation and photovoltaic power generation have developed rapidly, and their installed power capacity ratio in the power system has gradually increased. The dynamic characteristics of the new energy power generation system have gradually increased the impact on the transient stability of the power system. The accuracy of the new energy power generation system model has become a key factor in the accuracy of the electromechanical transient simulation results. In addition, in order to minimize the impact of the randomness and volatility of the output of new energy sources such as wind power generation and photovoltaic power generation, energy storage systems, as an important regulatory factor that can smooth out peaks and fill valleys, are also playing an increasingly important role in the power system. The installed capacity has gradually increased and has gradually become an important factor affecting system stability. The accuracy of its transient model has also had an increasingly greater impact on electromechanical transient simulation.

[0003] In existing electromechanical transient simulations, simulation software typically provides standard models for new energy systems. These models typically include power conversion models, primary system models (doubly-fed wind turbine asynchronous motor models, direct-drive wind turbine synchronous motor models, photovoltaic cell models, and energy storage battery models), converter normal operation control system models, fault control system models, and additional control system models (frequency modulation control). For each model, the simulation software provides several typical model structures. One of these structures is selected, and a set of parameters is identified to fit the dynamic response of an actual new energy power generation system or energy storage system.

[0004] In actual new energy systems, there are numerous equipment manufacturers, and each equipment manufacturer also includes a variety of different models. Each model may also produce different control software versions due to control software upgrades. The dynamic response of each different model or different software version of the unit is different. In addition, due to commercial confidentiality and other reasons, the equipment manufacturers of new energy power generation systems and energy storage systems do not disclose the relevant control strategies of the models. Therefore, the standard model provided by the simulation software and the unit model identified based on the standard model may have significant differences from the control strategy of the actual unit, and the dynamic response is unlikely to be exactly the same. It is impossible to accurately simulate the dynamic response of the new energy power generation system and energy storage system, which ultimately affects the absorption and transmission of new energy power. Therefore, how to accurately model the new energy system without the equipment manufacturer disclosing the model control strategy, so that the dynamic response of the simulated unit model of the new energy system is the same as that of the actual unit model, and improve the accuracy of the electromechanical transient simulation results, is a technical problem that needs to be solved urgently by those skilled in the art. Summary of the Invention

[0005] The present invention provides a modeling method and system for an electromechanical transient analysis model of a new energy system, which is used to solve the technical problem that in the existing electromechanical transient simulation of a new energy system, it is difficult to accurately model the new energy when the equipment manufacturer does not disclose the model control strategy, so that the dynamic response of the simulated unit model of the new energy system is the same as that of the actual unit model, resulting in low accuracy of the electromechanical transient simulation results.

[0006] In view of this, a first aspect of the present invention provides a method for modeling an electromechanical transient analysis model of a new energy system, comprising:

[0007] The new energy system is divided into the main system and the control system. The new energy system includes the new energy power generation system and the energy storage system;

[0008] Construct the main system model using the standard model structure provided by the electromechanical transient simulation software and the main system design parameters provided by the equipment manufacturer;

[0009] Build a control system model through a dynamic link library, which includes the entire control system model of the new energy power generation system or energy storage system;

[0010] Connect the main system model of the new energy power generation system or energy storage system with the control system model;

[0011] During the control system model initialization phase, the control system model is called by the main system model to ensure that the electromechanical transient simulation of the new energy system starts from the equilibrium state. The control system model is initialized based on the internal parameters of the dynamic link library model, grid connection point voltage information, bus frequency, new energy system output active power, new energy system output reactive power, calculates the new energy output active current and new energy output reactive current, and passes the calculation results to the main system model;

[0012] During the simulation calculation stage, each step of the control system model is called by the main system model. The control system model obtains the grid connection point voltage information and bus frequency from the main system model, calculates the output active power of the new energy system, the output reactive power of the new energy system, the output active current of the new energy system and the reactive current of the new energy system, and passes the calculation results to the main system model. In each simulation step, the dynamic link library is calculated according to the internal parameters of the dynamic link library provided by the main system model, the grid connection point voltage information and bus frequency calculated by the main system model in the previous step, and the output active power, output reactive power, output active current and output reactive current calculated by the dynamic link library model in each step are recorded. After the calculation is completed, the average value of the output active power, output reactive power, output active current and output reactive current calculated in 20 steps is taken and passed to the main system model.

[0013] Optionally, the grid connection point voltage information includes a positive-sequence voltage amplitude, a positive-sequence voltage phase angle, a negative-sequence voltage amplitude, a negative-sequence voltage phase angle, a zero-sequence voltage amplitude, and a zero-sequence voltage phase angle.

[0014] Optionally, the calculation step size of the main system model is 0.01 seconds, and the calculation step size of the control system model is 0.0005 seconds.

[0015] Optionally, the grid connection point voltage information, bus frequency, new energy system output active power, and new energy system output reactive power all use nominal values.

[0016] Optionally, the dynamic link library is written in C, C++ or FORTRAN.

[0017] A second aspect of the present invention provides a modeling system for an electromechanical transient analysis model of a new energy system, comprising:

[0018] A pre-processing module is used to divide the new energy system into a main system and a control system. The new energy system includes a new energy power generation system and an energy storage system;

[0019] The first modeling module is used to construct a main system model using a standard model structure provided by electromechanical transient simulation software and main system design parameters provided by the equipment manufacturer;

[0020] The second modeling module is used to construct a control system model through a dynamic link library, and the control system model includes the entire control system model of the new energy power generation system or the energy storage system;

[0021] A connection module is used to connect the main system model of the new energy power generation system or energy storage system with the control system model;

[0022] Calling module for:

[0023] Call the initialization function. During the control system model initialization phase, the control system model is called by the main system model to ensure that the electromechanical transient simulation of the new energy system starts from the equilibrium state. The control system model is initialized based on the internal parameters of the dynamic link library model, grid connection point voltage information, bus frequency, new energy system output active power, new energy system output reactive power, calculate the new energy output active current and new energy output reactive current, and pass the calculation results to the main system model.

[0024] Call the simulation calculation function. During the simulation calculation stage, each step of the control system model is called by the main system model. The control system model obtains the grid connection point voltage information and bus frequency from the main system model, calculates the new energy system output active power, new energy system output reactive power, new energy output active current and new energy reactive current, and passes the calculation results to the main system model. In each simulation step, the dynamic link library is calculated based on the internal parameters of the dynamic link library provided by the main system model and the grid connection point voltage information and bus frequency calculated by the main system model in the previous step. The output active power, output reactive power, output active current and output reactive current calculated by the dynamic link library model in each step are recorded. After the calculation is completed, the average value of the output active power, output reactive power, output active current and output reactive current calculated in 20 steps is taken and passed to the main system model.

[0025] Optionally, the grid connection point voltage information includes a positive-sequence voltage amplitude, a positive-sequence voltage phase angle, a negative-sequence voltage amplitude, a negative-sequence voltage phase angle, a zero-sequence voltage amplitude, and a zero-sequence voltage phase angle.

[0026] Optionally, the calculation step size of the main system model is 0.01 seconds, and the calculation step size of the control system model is 0.0005 seconds.

[0027] Optionally, the grid connection point voltage information, bus frequency, new energy system output active power, and new energy system output reactive power all use nominal values.

[0028] Optionally, the dynamic link library is written in C, C++ or FORTRAN.

[0029] From the above technical solutions, it can be seen that the electromechanical transient analysis model modeling method of the new energy system provided by the present invention has the following advantages:

[0030] The electromechanical transient analysis model modeling method of the new energy system provided by the present invention divides the electromechanical transient simulation modeling of the new energy system into two parts, namely the main system and the control system, and models them separately. The main system is modeled by the electromechanical transient simulation software using a standard model, and the control system is modeled by the equipment manufacturer using a dynamic link library. This can not only reduce the difficulty and workload of the equipment manufacturer in establishing the dynamic link library model and achieve completely accurate modeling of the new energy system, but also protect the commercial secrets of the equipment manufacturer and eliminate the risk of control strategy leakage. It solves the technical problem that the existing electromechanical transient simulation of the new energy system is difficult to accurately model the new energy system when the equipment manufacturer does not disclose the model control strategy, so that the dynamic response of the simulated unit model of the new energy system is the same as that of the actual unit model, resulting in low accuracy of the electromechanical transient simulation results. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying any creative work.

[0032] Figure 1 A schematic flow chart of a method for modeling an electromechanical transient analysis model of a new energy system provided in the present invention;

[0033] Figure 2 This is a schematic diagram of information interaction between the main system model and the control system model during the control system model simulation calculation phase provided by the present invention;

[0034] Figure 3 This is a schematic diagram of information interaction between the main system model and the control system model during the control system model initialization phase provided by the present invention;

[0035] Figure 4 This is a structural diagram of the electromechanical transient analysis model modeling system of the new energy system provided in the present invention. DETAILED DESCRIPTION

[0036] In order to enable those skilled in the art to better understand the solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0037] For easier understanding, see Figures 1 to 3 The present invention provides an embodiment of a method for modeling an electromechanical transient analysis model of a new energy system, comprising:

[0038] Step 101: Divide the new energy system into a main system and a control system. The new energy system includes a new energy power generation system and an energy storage system.

[0039] It should be noted that the new energy system includes a new energy power generation system and an energy storage system. Taking the new energy power generation system as an example, it includes an electric energy conversion model (such as a wind power model, a wind speed model), a primary system model (such as a doubly fed wind turbine asynchronous motor model, a direct drive wind turbine synchronous motor model, a photovoltaic cell model, an energy storage battery model), a normal operation control system model (such as a machine-side converter active power control model, a machine-side converter reactive power control model, a grid-side converter active power control model, a grid-side converter reactive power control model, a diesel pitch angle control system model, a maximum power tracking model), a fault state control system model (such as fault ride-through active power control and reactive power control) and an additional control system model (frequency modulation control). In the present invention, the new energy system for electromechanical transient simulation is divided into a main system and a control system for modeling respectively.

[0040] Step 102: Construct a main system model using the standard model structure provided by the electromechanical transient simulation software and the main system design parameters provided by the equipment manufacturer.

[0041] It should be noted that the main system model is derived from the standard model structure provided by electromechanical transient simulation software and the relevant design parameters of the main system provided by the equipment manufacturer. The main system model includes the power conversion model (such as the wind power model and wind speed model) and the primary system model (such as the doubly-fed wind turbine asynchronous motor model, the direct-drive wind turbine synchronous motor model, the photovoltaic cell model, and the energy storage battery model).

[0042] Step 103: construct a control system model through a dynamic link library. The control system model includes the entire control system model of the new energy power generation system or the energy storage system.

[0043] It should be noted that the control system is modeled using a dynamic link library (DLL), which is generated by the equipment manufacturer using C, C++, or FORTRAN programming language and encapsulated into a DLL file. The DLL modeling objects include all control system models of the new energy system.

[0044] Step 104: Connect the main system model of the new energy power generation system or energy storage system with the control system model.

[0045] Step 105: During the control system model initialization phase, the control system model is called by the main system model to ensure that the electromechanical transient simulation of the new energy system starts from the equilibrium state. The control system model is initialized based on the internal parameters of the dynamic link library model, the grid connection point voltage information, the bus frequency, the new energy system output active power, and the new energy system output reactive power. The new energy output active current and the new energy output reactive current are calculated, and the calculation results are passed to the main system model.

[0046] Step 106: During the simulation calculation phase, each step of the control system model is called by the main system model. The control system model obtains the grid connection point voltage information and bus frequency from the main system model, calculates the output active power of the new energy system, the output reactive power of the new energy system, the output active current of the new energy system, and the reactive current of the new energy system, and transmits the calculation results to the main system model. In each simulation step, the dynamic link library is calculated based on the internal parameters of the dynamic link library provided by the main system model and the grid connection point voltage information and bus frequency calculated by the main system model in the previous step. The output active power, output reactive power, output active current, and output reactive current calculated by the dynamic link library model in each step are recorded. After the calculation is completed, the average value of the output active power, output reactive power, output active current, and output reactive current calculated in 20 steps is taken and transmitted to the main system model.

[0047] It should be noted that the interactive information between the main system model and the control system model includes the internal parameters of the dynamic link library, grid connection point voltage information (including positive-sequence voltage amplitude, positive-sequence voltage phase angle, negative-sequence voltage amplitude, negative-sequence voltage phase angle, zero-sequence voltage amplitude, and zero-sequence voltage phase angle), bus frequency, active power output by the renewable energy generation system or energy storage system, reactive power output by the renewable energy generation system or energy storage system, active current output by the renewable energy generation system or energy storage system, and reactive current output by the renewable energy generation system or energy storage system. To reduce data volume and improve processing speed, the grid connection point voltage information, bus frequency, active power output by the renewable energy system, and reactive power output by the renewable energy system are all expressed in nominal values. The unit of voltage amplitude is kilovolt (kV), the unit of voltage phase angle is radian, the unit of frequency is Hertz (Hz), the unit of active power is MW, the unit of reactive power is MVar, and the unit of current is kA.

[0048] The control system model constructed by the dynamic link library contains two functions, one is the initialization function, and the other is the simulation calculation function. After the main system model is connected to the control system model, the control system model is first initialized by starting the initialization function. During the initialization stage, the control system model is called by the main system model to ensure that the simulation of the entire new energy system starts from the equilibrium state. The internal parameters of the dynamic link library model, the grid connection point voltage information, the bus frequency, the new energy system output active power, the new energy system output reactive power and other interactive information are obtained by the main program from the simulation input data. The control system model is initialized according to the internal parameters of the dynamic link library model, the grid connection point voltage information (including positive sequence voltage amplitude, positive sequence voltage phase angle, negative sequence voltage amplitude, negative sequence voltage phase angle, zero sequence voltage amplitude, zero sequence voltage phase angle), bus frequency, the new energy power generation system or energy storage system output active power, the new energy power generation system or energy storage system output reactive power, etc., and the information such as the new energy power generation system or energy storage system output active current, the new energy power generation system or energy storage system output reactive current is calculated and passed to the new energy main system model, such as Figure 2 shown.

[0049] In the simulation calculation stage, the control system model starts the simulation calculation function. In the simulation calculation stage, each calculation step of the control system model is called by the system model once. The internal parameters of the dynamic link library are obtained from the simulation input data by the electromechanical transient simulation program. The grid connection point voltage information (including positive sequence voltage amplitude, positive sequence voltage phase angle, negative sequence voltage amplitude, negative sequence voltage phase angle, zero sequence voltage amplitude, zero sequence voltage phase angle) and bus frequency are calculated by the main system model. The main system model passes this information to the control system model. The control system calculates the output active power of the new energy system or energy storage system, the output reactive power of the new energy system or energy storage system, the output active current of the new energy system or energy storage system, and the output reactive current of the new energy system or energy storage system based on this information, and then passes the calculation results to the main system model, such as Figure 3 shown.

[0050] The main model of the electromechanical transient simulation uses a calculation step size of 0.01 seconds. The dynamic link library of the new energy system or energy storage system requires a smaller calculation step size of 0.0005 seconds. Within one main model step size, the dynamic link library of the new energy system or energy storage system requires 20 calculation steps. In each simulation step, the dynamic link library is calculated first. The dynamic link library calculation is performed based on the internal parameters of the dynamic link library provided by the main model, the positive sequence voltage amplitude, positive sequence voltage phase angle, negative sequence voltage amplitude, negative sequence voltage phase angle, zero sequence voltage amplitude, zero sequence voltage phase angle, bus frequency and other information calculated by the main model in the previous step. The output active power, output reactive power, output active current, and output reactive current calculated by the dynamic link library are recorded at each step. After the calculation is completed, the average value of the output active power, output reactive power, output active current, output reactive current and other variables calculated in 20 steps is taken and transferred to the main model. The main model takes the output active power, output reactive power, output active current, output reactive current and other information provided by the dynamic link library as input to calculate the main model of the large power grid. After the calculation is completed, a calculation step ends and enters the next step.

[0051] The electromechanical transient analysis model modeling method of the new energy system provided by the present invention divides the electromechanical transient simulation modeling of the new energy system into two parts, namely the main system and the control system, and models them separately. The main system is modeled by the electromechanical transient simulation software using a standard model, and the control system is modeled by the equipment manufacturer using a dynamic link library. This can not only reduce the difficulty and workload of the equipment manufacturer in establishing the dynamic link library model and achieve completely accurate modeling of the new energy system, but also protect the commercial secrets of the equipment manufacturer and eliminate the risk of control strategy leakage. It solves the technical problem that the existing electromechanical transient simulation of the new energy system is difficult to accurately model the new energy system when the equipment manufacturer does not disclose the model control strategy, so that the dynamic response of the simulated unit model of the new energy system is the same as that of the actual unit model, resulting in low accuracy of the electromechanical transient simulation results.

[0052] For easier understanding, see Figure 4 The present invention provides an embodiment of a modeling system for an electromechanical transient analysis model of a new energy system, comprising:

[0053] A pre-processing module is used to divide the new energy system into a main system and a control system. The new energy system includes a new energy power generation system and an energy storage system;

[0054] The first modeling module is used to construct a main system model using a standard model structure provided by electromechanical transient simulation software and main system design parameters provided by the equipment manufacturer;

[0055] The second modeling module is used to construct a control system model through a dynamic link library, and the control system model includes the entire control system model of the new energy power generation system or the energy storage system;

[0056] A connection module is used to connect the main system model of the new energy power generation system or energy storage system with the control system model;

[0057] Calling module for:

[0058] Call the initialization function. During the control system model initialization phase, the control system model is called by the main system model to ensure that the electromechanical transient simulation of the new energy system starts from the equilibrium state. The control system model is initialized based on the internal parameters of the dynamic link library model, grid connection point voltage information, bus frequency, new energy system output active power, new energy system output reactive power, calculate the new energy output active current and new energy output reactive current, and pass the calculation results to the main system model.

[0059] Call the simulation calculation function. During the simulation calculation stage, each step of the control system model is called by the main system model. The control system model obtains the grid connection point voltage information and bus frequency from the main system model, calculates the new energy system output active power, new energy system output reactive power, new energy output active current and new energy reactive current, and passes the calculation results to the main system model. In each simulation step, the dynamic link library is calculated based on the internal parameters of the dynamic link library provided by the main system model and the grid connection point voltage information and bus frequency calculated by the main system model in the previous step. The output active power, output reactive power, output active current and output reactive current calculated by the dynamic link library model in each step are recorded. After the calculation is completed, the average value of the output active power, output reactive power, output active current and output reactive current calculated in 20 steps is taken and passed to the main system model.

[0060] The grid connection point voltage information includes positive sequence voltage amplitude, positive sequence voltage phase angle, negative sequence voltage amplitude, negative sequence voltage phase angle, zero sequence voltage amplitude and zero sequence voltage phase angle.

[0061] The calculation step size of the main system model is 0.01 seconds, and the calculation step size of the control system model is 0.0005 seconds.

[0062] The grid connection point voltage information, bus frequency, new energy system output active power, and new energy system output reactive power all use nominal values.

[0063] The dynamic link library is written in C, C++ or FORTRAN.

[0064] The electromechanical transient analysis model modeling system of the new energy system provided in the present invention is used to execute the electromechanical transient analysis model modeling method of the new energy system provided in the present invention. Its principles and technical effects are the same as those of the electromechanical transient analysis model modeling method of the new energy system provided in the present invention, and will not be repeated here.

[0065] As described above, the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that the technical solutions described in the above embodiments can still be modified, or some of the technical features thereof can be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for modeling an electromechanical transient analysis model of a new energy system, characterized in that: include: The new energy system is divided into the main system and the control system. The new energy system includes the new energy power generation system and the energy storage system; Construct the main system model using the standard model structure provided by the electromechanical transient simulation software and the main system design parameters provided by the equipment manufacturer; Build a control system model through a dynamic link library, which includes the entire control system model of the new energy power generation system or energy storage system; Connect the main system model of the new energy power generation system or energy storage system with the control system model; During the control system model initialization phase, the control system model is called by the main system model to ensure that the electromechanical transient simulation of the new energy system starts from the equilibrium state. The control system model is initialized based on the internal parameters of the dynamic link library model, grid connection point voltage information, bus frequency, new energy system output active power, new energy system output reactive power, calculates the new energy output active current and new energy output reactive current, and passes the calculation results to the main system model; During the simulation calculation stage, each step of the control system model is called by the main system model. The control system model obtains the grid connection point voltage information and bus frequency from the main system model, calculates the output active power of the new energy system, the output reactive power of the new energy system, the output active current of the new energy system and the reactive current of the new energy system, and passes the calculation results to the main system model. In each simulation step, the dynamic link library is calculated according to the internal parameters of the dynamic link library provided by the main system model, the grid connection point voltage information and bus frequency calculated by the main system model in the previous step, and the output active power, output reactive power, output active current and output reactive current calculated by the dynamic link library model in each step are recorded. After the calculation is completed, the average value of the output active power, output reactive power, output active current and output reactive current calculated in 20 steps is taken and passed to the main system model.

2. The electromechanical transient analysis model modeling method for a new energy system according to claim 1 is characterized in that: The grid connection point voltage information includes positive sequence voltage amplitude, positive sequence voltage phase angle, negative sequence voltage amplitude, negative sequence voltage phase angle, zero sequence voltage amplitude and zero sequence voltage phase angle.

3. The electromechanical transient analysis model modeling method for a new energy system according to claim 2 is characterized in that: The calculation step size of the main system model is 0.01 seconds, and the calculation step size of the control system model is 0.0005 seconds.

4. The electromechanical transient analysis model modeling method for a new energy system according to claim 3 is characterized in that: The grid connection point voltage information, bus frequency, new energy system output active power, and new energy system output reactive power all use nominal values.

5. The electromechanical transient analysis model modeling method for a new energy system according to claim 1 is characterized in that: The dynamic link library is written in C, C++ or FORTRAN.

6. A modeling system for electromechanical transient analysis of new energy systems, characterized by: include: A pre-processing module is used to divide the new energy system into a main system and a control system. The new energy system includes a new energy power generation system and an energy storage system; The first modeling module is used to construct a main system model using a standard model structure provided by electromechanical transient simulation software and main system design parameters provided by the equipment manufacturer; The second modeling module is used to construct a control system model through a dynamic link library, and the control system model includes the entire control system model of the new energy power generation system or the energy storage system; A connection module is used to connect the main system model of the new energy power generation system or energy storage system with the control system model; Calling module for: Call the initialization function. During the control system model initialization phase, the control system model is called by the main system model to ensure that the electromechanical transient simulation of the new energy system starts from the equilibrium state. The control system model is initialized based on the internal parameters of the dynamic link library model, grid connection point voltage information, bus frequency, new energy system output active power, new energy system output reactive power, calculate the new energy output active current and new energy output reactive current, and pass the calculation results to the main system model. Call the simulation calculation function. During the simulation calculation stage, each step of the control system model is called by the main system model. The control system model obtains the grid connection point voltage information and bus frequency from the main system model, calculates the new energy system output active power, new energy system output reactive power, new energy output active current and new energy reactive current, and passes the calculation results to the main system model. In each simulation step, the dynamic link library is calculated based on the internal parameters of the dynamic link library provided by the main system model and the grid connection point voltage information and bus frequency calculated by the main system model in the previous step. The output active power, output reactive power, output active current and output reactive current calculated by the dynamic link library model in each step are recorded. After the calculation is completed, the average value of the output active power, output reactive power, output active current and output reactive current calculated in 20 steps is taken and passed to the main system model.

7. The electromechanical transient analysis modeling system for new energy systems according to claim 6 is characterized in that: The grid connection point voltage information includes positive sequence voltage amplitude, positive sequence voltage phase angle, negative sequence voltage amplitude, negative sequence voltage phase angle, zero sequence voltage amplitude and zero sequence voltage phase angle.

8. The electromechanical transient analysis model modeling system for new energy systems according to claim 7 is characterized in that: The calculation step size of the main system model is 0.01 seconds, and the calculation step size of the control system model is 0.0005 seconds.

9. The electromechanical transient analysis modeling system for new energy systems according to claim 8, characterized in that: The grid connection point voltage information, bus frequency, new energy system output active power, and new energy system output reactive power all use nominal values.

10. The electromechanical transient analysis modeling system for new energy systems according to claim 6, characterized in that: The dynamic link library is written in C, C++ or FORTRAN.

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