A method, device, electronic equipment and medium for rapid frequency simulation of a large power grid

Abstract

The present invention relates to the technical field of power grid simulation, and discloses a method, device, electronic equipment, and medium for rapid frequency simulation of a large power grid. The method performs rapid frequency simulation response under the condition that the voltage and power angle of the power grid system are stable, thereby ignoring the interference of reactive power distribution and grid structure on the frequency response, thereby improving the accuracy of frequency response. A frequency response model is constructed through the frequency response device of the power grid system, and the frequency response model is used to determine the relationship between frequency fluctuation and the active power adjustment amount of the frequency response device, thereby determining the frequency change rate of the power grid system, and then simulating to obtain the change relationship data between frequency and simulation time, thereby greatly improving the work efficiency of large-scale frequency simulation analysis.

Description

Technical Field

[0001] The present invention relates to the technical field of power grid simulation, and in particular to a method, device, electronic equipment and medium for rapid frequency simulation of a large power grid. Background Art

[0002] Currently, large-scale power grid frequency simulation primarily utilizes electromagnetic transient simulation or electromechanical transient simulation technology. For AC large-scale power grids with a high proportion of hydropower, the water hammer effect causes the turbine speed regulator to have a slow frequency regulation response. When combined with traditional thermal power units and energy storage devices with faster frequency regulation, it can easily occur that the grid frequency takes 60-80 seconds to stabilize after an active power disturbance.

[0003] For frequency calculation and analysis, electromechanical transient simulation tools are usually used to perform simulations of 100 to 120 seconds. The simulation time takes more than 5 minutes, which greatly reduces the efficiency of large-scale frequency simulation analysis. Summary of the Invention

[0004] In view of this, the present invention provides a method, device, electronic equipment and medium for rapid frequency simulation of a large power grid, which solves the technical problem of greatly reducing the work efficiency of large-scale frequency simulation analysis.

[0005] A first aspect of the present invention provides a method for rapid frequency simulation of a large power grid, comprising:

[0006] When the voltage and power angle of the power grid system are stable, a frequency response model is constructed according to the frequency response device of the power grid system;

[0007] Inputting the current frequency fluctuation of the power grid system into the frequency response model, and outputting the active power adjustment of the frequency response device corresponding to the current frequency fluctuation;

[0008] determining a frequency change rate of the power grid system according to an active power adjustment amount of the frequency response device;

[0009] updating the current system frequency of the power grid system according to the frequency change rate of the power grid system, and determining whether the current simulation time is less than a preset simulation time;

[0010] When it is determined that the current simulation time is less than the preset simulation duration, the current simulation time is updated according to the preset time step, and the current frequency fluctuation of the power grid system is updated according to the updated current system frequency. The process then proceeds to the step of inputting the current frequency fluctuation of the power grid system into the frequency response model and outputting the active power adjustment amount of the frequency response device corresponding to the current frequency fluctuation. This process continues until the current simulation time reaches the preset simulation duration, at which point the iteration stops and outputs data on the relationship between the frequency and simulation time.

[0011] Optionally, the step of constructing a frequency response model according to a frequency response device of the power grid system when the voltage and power angle of the power grid system are stable further includes:

[0012] Determining whether the voltage of the power grid system is in a stable state after the generator is cut off or DC is locked;

[0013] When it is determined that the voltage of the power grid system is not in a stable state after the generator is tripped or the DC is blocked, the voltage of the power grid system is adjusted to reach a stable state.

[0014] Optionally, the step of constructing a frequency response model based on a frequency response device of the power grid system when the voltage and power angle of the power grid system are stable further includes:

[0015] Determining whether the power angle of the power grid system is in a stable state after generator tripping or DC blocking;

[0016] When it is determined that the power angle of the power grid system is not in a stable state after the generator is tripped or the DC blocking is performed, the power angle of the power grid system is adjusted to reach a stable state.

[0017] Optionally, the frequency response device includes a synchronous machine, a direct current transmission module, a new energy electric field, and a load; and the step of constructing a frequency response model based on the frequency response device of the power grid system includes:

[0018] A frequency response model corresponding to each frequency response device is established based on electromechanical transient simulation technology. The frequency response model is used to characterize the relationship between the current frequency fluctuation of the power grid system and the active power adjustment of the frequency response device.

[0019] Optionally, the step of determining the frequency change rate of the power grid system according to the active power adjustment amount of the frequency response device includes:

[0020] The frequency change rate of the power grid system is determined according to the active power adjustment amount of the frequency response device, the system active power disturbance amount and the system inertia.

[0021] Optionally, the system inertia is determined according to the rotor kinetic energy of the synchronous machine and the total system load.

[0022] In a second aspect, the present invention further provides a large power grid rapid frequency simulation device, comprising:

[0023] A frequency response module, configured to construct a frequency response model based on a frequency response device of the power grid system when the voltage and power angle of the power grid system are stable;

[0024] a power adjustment module, configured to input a current frequency fluctuation of the power grid system into the frequency response model and output an active power adjustment of the frequency response device corresponding to the current frequency fluctuation;

[0025] a frequency change determination module, configured to determine a frequency change rate of the power grid system according to an active power adjustment amount of the frequency response device;

[0026] a frequency updating module, configured to update the current system frequency of the power grid system according to the frequency change rate of the power grid system, and determine whether the current simulation time is less than a preset simulation time;

[0027] A frequency simulation module is configured to update the current simulation time according to a preset time step when it is determined that the current simulation time is less than the preset simulation duration, and to update the current frequency fluctuation of the power grid system according to the updated current system frequency, and to execute the input of the current frequency fluctuation of the power grid system into the frequency response model, output the active power adjustment of the frequency response device corresponding to the current frequency fluctuation, until the current simulation time reaches the preset simulation duration, and output data on the relationship between the frequency and simulation time.

[0028] In a third aspect, the present invention further provides an electronic device comprising a memory and a processor, wherein a computer program is stored in the memory, and when the computer program is executed by the processor, the processor executes the steps of the large power grid rapid frequency simulation method as described in the first aspect.

[0029] In a fourth aspect, the present invention further provides a computer-readable storage medium having a computer program stored thereon, which, when executed, implements the steps of the large power grid fast frequency simulation method as described in the first aspect.

[0030] In a fifth aspect, the present invention further provides a computer program product, comprising a computer program stored on a non-transitory computer-readable storage medium, wherein the computer program comprises program instructions, wherein when the program instructions are executed by a computer, the computer is caused to perform the steps of the large power grid rapid frequency simulation method as described in the first aspect.

[0031] It can be seen from the above technical solutions that the present invention considers fast frequency simulation response under the condition of stable voltage and power angle of the power grid system, thereby ignoring the interference of reactive power distribution and grid structure on frequency response, improving the accuracy of frequency response, and constructing a frequency response model through the frequency response device of the power grid system. The frequency response model is used to determine the relationship between frequency fluctuation and the active power adjustment amount of the frequency response device, thereby determining the frequency change rate of the power grid system, and then simulating to obtain the change relationship data of frequency and simulation time, which greatly improves the work efficiency of large-scale frequency simulation analysis. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 A diagram illustrating an application environment of a large power grid rapid frequency simulation method provided by an embodiment of the present invention;

[0033] Figure 2 A flowchart of a large power grid fast frequency simulation method provided by an embodiment of the present invention;

[0034] Figure 3 A single-node equivalent network diagram provided by an embodiment of the present invention;

[0035] Figure 4 A schematic structural diagram of a large power grid fast frequency simulation device provided by an embodiment of the present invention;

[0036] Figure 5 A schematic structural diagram of an electronic device provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0037] 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.

[0038] The large power grid fast frequency simulation method provided in the embodiment of the present application can be applied to Figure 1 In the application environment shown, various device nodes in the power grid system communicate with server 102 via a network. A data storage system can store data that server 102 needs to process. The data storage system can be integrated with server 102 or placed in the cloud or on other network servers. Server 102 can be a standalone physical server, a server cluster or distributed system consisting of multiple physical servers, or a cloud server providing cloud computing services.

[0039] like Figure 2As shown, the embodiment of the present application provides a method for rapid frequency simulation of a large power grid, which is applied to Figure 1 The server 102 in the example is used as an example to illustrate the method, which includes the following steps S1 to S5.

[0040] Step S1: When the voltage and power angle of the power grid system are stable, a frequency response model is constructed according to the frequency response device of the power grid system.

[0041] It's important to note that frequency fluctuations in power grids are caused by an imbalance between the active power generated by system equipment and the active power absorbed by them. Unlike reactive power, which affects voltage locally, the impact of active power on frequency is generally considered global. Frequency response is performed under the assumption that the voltage and power angle of the power grid are stable, ignoring reactive power distribution and grid structure.

[0042] It is understood that when the grid system has sufficient reactive power support and the voltage at each node remains at 1.0 pu before and after the disturbance, the voltage is stable. Before step S1, it should be determined whether the voltage after the grid system generator tripping or DC blocking is stable. If it is determined that the voltage after the grid system generator tripping or DC blocking is not stable, the grid system voltage is adjusted to achieve a stable state.

[0043] Among them, when it is judged that the voltage of the power grid system is not in a stable state after the generator is cut off or the DC lock is blocked, it means that the reactive strength of the power grid is insufficient. The voltage of the power grid system should be adjusted to a stable state. Adjustment methods, such as using static VAR compensators and static synchronous compensators to inject or absorb reactive power as needed, help maintain voltage stability.

[0044] When it is determined that the voltage of the power grid system is in a stable state after the generator is cut off or the DC is blocked, it is determined that the voltage of the power grid system is stable, and the next step is started.

[0045] In addition, when the power grid system ignores the temporal and spatial distribution characteristics of the frequency and the factors affecting the instability of the synchronous machine power angle, the frequency of each node in the power grid system and the speed frequency of the synchronous machine are kept consistent, which is the power angle stability.

[0046] It is understandable that at the moment of disturbance, the voltage phase angle and speed (node ​​frequency) at different nodes of the power grid may differ slightly, but the deviation is negligible. Based on frequency simulation experience, for DC blocking (transmission power 8000MW), the frequencies of different units will vary at the moment of disturbance, but the difference is not significant, and the steady-state frequency is consistent. However, if after generator tripping or DC blocking, the frequency deviations between different nodes are too large due to power angle issues, addressing power angle instability should be prioritized. Therefore, before step S1, it should be determined whether the power angle of the power grid system is stable after generator tripping or DC blocking. If it is determined that the power angle of the power grid system is not stable after generator tripping or DC blocking, the power angle of the power grid system should be adjusted to achieve a stable state.

[0047] Among them, when it is judged that the power angle of the power grid system is not in a stable state after the machine is cut off or DC locking, it means that the power angle problem causes the frequency deviation of different nodes to be too large, and the power angle of the power grid system is adjusted to a stable state. The way to adjust the power angle of the power grid system can be coordinated with the speed regulator and the excitation regulation. Among them, the speed regulator adjusts the output power of the prime mover to respond to frequency changes. When the frequency decreases, the mechanical power input is increased; vice versa. This helps to keep the speed of the synchronous generator close to the rated value. And by changing the excitation current of the generator to adjust the reactive power output, thereby affecting the voltage level of the generator. A good excitation control system can quickly respond to system disturbances and help restore power angle stability.

[0048] like Figure 3 In the single-node equivalent network shown, the frequency response devices include synchronous machines, DC transmission modules, new energy electric fields and loads.

[0049] Synchronous generators are equipped with speed regulators. When grid frequency drops, the regulator increases the output of the prime mover (such as a steam turbine or hydro turbine), thereby increasing the generator's power output and helping to restore frequency. When frequency anomalies occur on the AC side, the DC transmission module can adjust the operating mode of the converter station to increase or decrease power flow, thereby affecting the frequency state of the connected AC network. Renewable energy farms can participate in frequency response through energy storage devices or by adjusting inverter control strategies. For example, when a frequency drop is detected, they can quickly release pre-stored energy. When the frequency is high, they may temporarily reduce power delivered to the grid or absorb additional energy for storage. Loads include interruptible loads and demand-side response. These measures allow grid operators to temporarily disconnect service to non-critical users or shift certain types of electricity consumption to other times as needed. While this approach directly reduces power supply, it ultimately helps maintain supply and demand balance and frequency stability across the entire system.

[0050] In some embodiments, the process of constructing a frequency response model based on the frequency response device of the power grid system in step S2 includes:

[0051] Based on electromechanical transient simulation technology, a corresponding frequency response model is established for each frequency response device. The frequency response model is used to characterize the relationship between the current frequency fluctuation of the power grid system and the active power adjustment of the frequency response device.

[0052] Among them, the embodiment of the present application utilizes a general model for electromechanical transient simulation, that is, different types of model cards are combined to form a simulation script, the synchronous machine establishes a frequency response model based on the speed regulator and the prime mover (GI+GA+TB, GM+GA+TW and other model cards), the conventional DC establishes a frequency response model based on FLC control (DS model card), the flexible DC establishes a frequency response model (DK model card), the new energy establishes a frequency response model (EY model card), the constant power / constant impedance / constant current load establishes a frequency response model (LB model card), and the motor load establishes a frequency response model (MK model card).

[0053] The modeling methods and mathematical expressions of the frequency response models of the above devices are detailed in the PSD-BPA user manual and will not be repeated here.

[0054] The input of each frequency response model is the current frequency fluctuation of the power grid system, and its output is the active power adjustment of the frequency response device. The simplified mathematical expression is as follows:

[0055]

[0056] Where, 、 、 、 They are the active power adjustment of synchronous machine, DC transmission module, new energy electric field and load respectively. 、 、 、 are the frequency response functions of synchronous machine, DC transmission module, new energy electric field and load respectively, The current frequency fluctuation of the power grid system is the difference between the current frequency of the power grid system and the reference frequency (50HZ).

[0057] Step S2: inputting the current frequency fluctuation of the power grid system into the frequency response model, and outputting the active power adjustment of the frequency response device corresponding to the current frequency fluctuation.

[0058] Step S3: determining the frequency change rate of the power grid system according to the active power adjustment amount of the frequency response device.

[0059] Specifically, the frequency change rate of the power grid system is determined based on the active power adjustment of the frequency response device, the system active power disturbance and the system inertia, that is:

[0060]

[0061] Where, is the system active power disturbance, generally the generator shedding capacity, load shedding capacity or DC blocking capacity. is the frequency change rate of the power grid system, is the frequency, is the system inertia. The system inertia is determined based on the rotor kinetic energy of the synchronous machine and the total system load. That is:

[0062]

[0063] Where, is the rotor kinetic energy of synchronous machine i, n is the number of synchronous machines, is the total system load, where the rotor kinetic energy of synchronous machine i can be directly obtained from the MF model card.

[0064] Step S4: updating the current system frequency of the power grid system according to the frequency change rate of the power grid system, and determining whether the current simulation time is less than a preset simulation time.

[0065] Among them, the process of updating the current system frequency of the power grid system is f t+1 =f t +f, where f t 、f t+1 are the frequencies at simulation time t and t+1 respectively.

[0066] Step S5: When it is determined that the current simulation time is less than the preset simulation duration, the current simulation time is updated according to the preset time step, and the current frequency fluctuation of the power grid system is updated according to the updated current system frequency. The current frequency fluctuation of the power grid system is input into the frequency response model, and the active power adjustment amount of the frequency response device corresponding to the current frequency fluctuation is output. The iteration stops and the relationship data between the frequency and simulation time is output until the current simulation time reaches the preset simulation duration.

[0067] The simulation duration and simulation step are set. If the current simulation time is less than the preset simulation duration, it means that the simulation has not ended. In this case, the current simulation time needs to be updated, and the current frequency fluctuation of the power grid system is updated according to the updated current system frequency. The frequency of the next simulation moment is determined, and the iteration stops until the current simulation time reaches the preset simulation duration. The relationship between the frequency and simulation time is output, that is, the ft change curve.

[0068] It should be noted that the embodiment of the present application considers performing a fast frequency simulation response when the voltage and power angle of the power grid system are stable, thereby ignoring the interference of reactive power distribution and grid on the frequency response, improving the accuracy of the frequency response, and constructing a frequency response model through the frequency response device of the power grid system. The frequency response model is used to determine the relationship between the frequency fluctuation and the active power adjustment amount of the frequency response device, thereby determining the frequency change rate of the power grid system, and then simulating to obtain the change relationship data between the frequency and the simulation time, which greatly improves the work efficiency of large-scale frequency simulation analysis.

[0069] Based on the same inventive concept, an embodiment of the present application further provides a large power grid fast frequency simulation device for implementing the above-mentioned large power grid fast frequency simulation method.

[0070] The solution to the problem provided by the device is similar to the solution described in the above method. Therefore, the specific limitations in one or more large power grid fast frequency simulation device embodiments provided below can be found in the above limitations on the large power grid fast frequency simulation method and will not be repeated here.

[0071] like Figure 4 As shown, an embodiment of the present application provides a large power grid fast frequency simulation device, comprising:

[0072] The frequency response module 100 is used to construct a frequency response model based on the frequency response device of the power grid system when the voltage and power angle of the power grid system are stable;

[0073] The power adjustment module 200 is configured to input the current frequency fluctuation of the power grid system into the frequency response model and output the active power adjustment of the frequency response device corresponding to the current frequency fluctuation;

[0074] A frequency change determination module 300 is configured to determine a frequency change rate of the power grid system based on an active power adjustment amount of a frequency response device;

[0075] The frequency update module 400 is used to update the current system frequency of the power grid system according to the frequency change rate of the power grid system and determine whether the current simulation time is less than the preset simulation time;

[0076] The frequency simulation module 500 is configured to update the current simulation time according to a preset time step when it is determined that the current simulation time is less than a preset simulation duration, and to update the current frequency fluctuation of the power grid system according to the updated current system frequency. The module then executes the input of the current frequency fluctuation of the power grid system into the frequency response model, outputs the active power adjustment of the frequency response device corresponding to the current frequency fluctuation, and outputs data on the relationship between the frequency and simulation time until the current simulation time reaches the preset simulation duration.

[0077] In some embodiments, the device further includes: a voltage adjustment module for determining whether the voltage of the power grid system is in a stable state after the power grid system is disconnected or the DC is locked; when it is determined that the voltage of the power grid system is not in a stable state after the power grid system is disconnected or the DC is locked, the voltage of the power grid system is adjusted to a stable state.

[0078] In some embodiments, the device further includes: a power angle adjustment module, which is used to determine whether the power angle of the power grid system is in a stable state after the power grid system is cut off or the DC is locked; when it is determined that the power angle of the power grid system is not in a stable state after the power grid system is cut off or the DC is locked, the power angle of the power grid system is adjusted to reach a stable state.

[0079] In some embodiments, the frequency response device includes a synchronous machine, a direct current transmission module, a new energy electric field, and a load; the frequency response module 100 is used to establish a corresponding frequency response model for each frequency response device based on electromechanical transient simulation technology, and the frequency response model is used to characterize the relationship between the current frequency fluctuation of the power grid system and the active power adjustment of the frequency response device.

[0080] In some embodiments, the frequency change determination module 300 is configured to determine a frequency change rate of the power grid system according to an active power adjustment of the frequency response device, a system active power disturbance, and a system inertia.

[0081] The system inertia is determined based on the rotor kinetic energy of the synchronous machine and the total system load.

[0082] like Figure 5 As shown, an embodiment of the present application also provides an electronic device, the electronic device 10 includes a memory 20 and a processor 30, the memory 20 stores a computer program, and when the computer program is executed by the processor 30, the processor 30 executes the steps of the large power grid fast frequency simulation method in any of the above embodiments.

[0083] An embodiment of the present application further provides a computer-readable storage medium having a computer program stored thereon. When the computer program is executed, the steps of the large power grid rapid frequency simulation method as described in any of the above embodiments are implemented.

[0084] An embodiment of the present application also provides a computer program product, which includes a computer program stored on a non-transitory computer-readable storage medium, and the computer program includes program instructions. When the program instructions are executed by a computer, the computer executes the steps of the large power grid rapid frequency simulation method in any of the above embodiments.

[0085] Those skilled in the art will clearly understand that, for the convenience and brevity of description, the above-described system, electronic device, computer storage medium and specific working process can refer to the corresponding process in the aforementioned method embodiment and will not be repeated here.

[0086] It should be noted that the terms "including" and "having" and any variations thereof in the specification and claims of the present invention and the above-mentioned drawings are intended to cover non-exclusive inclusions. For example, a process, method, system, product or apparatus comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or are inherent to these processes, methods, products or apparatuses.

[0087] In several embodiments provided by the present invention, it is understood that each box in the flow chart or block diagram can represent a module, program segment or part of code, and the module, program segment or part of code contains one or more executable instructions for realizing the specified logical function. It should also be noted that in some alternative implementations, the functions marked in the box can also occur in a different order than that marked in the accompanying drawings. For example, two consecutive boxes can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, depending on the functions involved.

[0088] In the several embodiments provided by the present invention, it should be understood that the disclosed systems, electronic devices, computer storage media, computer program products and methods can be implemented in other ways. For example, the device embodiments described above are merely schematic. For example, the division of the units is merely a logical function division. In actual implementation, there may be other division methods, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be an indirect coupling or communication connection through some interfaces, devices or units, which can be electrical, mechanical or other forms.

[0089] The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of these units may be selected to achieve the purpose of this embodiment according to actual needs.

[0090] In addition, the functional units in the various embodiments of the present invention may be integrated into a single processing unit, each unit may exist physically separately, or two or more units may be integrated into a single unit. The aforementioned integrated units may be implemented in the form of hardware or software functional units.

[0091] If the integrated unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, or the portion that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions for executing all or part of the steps of the method described in each embodiment of the present invention via a computer device (which can be a personal computer, server, or network device, etc.). The aforementioned storage medium includes various media that can store program code, such as a USB flash drive, a mobile hard drive, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk.

[0092] 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 aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. 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 various embodiments of the present invention.

Claims

1. A method for rapid frequency simulation of a large power grid, characterized in that: include: When the voltage and power angle of the power grid system are stable, a frequency response model is constructed according to the frequency response device of the power grid system; Inputting the current frequency fluctuation of the power grid system into the frequency response model, and outputting the active power adjustment of the frequency response device corresponding to the current frequency fluctuation; determining a frequency change rate of the power grid system according to an active power adjustment amount of the frequency response device; updating the current system frequency of the power grid system according to the frequency change rate of the power grid system, and determining whether the current simulation time is less than a preset simulation time; When it is determined that the current simulation time is less than the preset simulation duration, the current simulation time is updated according to the preset time step, and the current frequency fluctuation of the power grid system is updated according to the updated current system frequency. The process then proceeds to the step of inputting the current frequency fluctuation of the power grid system into the frequency response model and outputting the active power adjustment amount of the frequency response device corresponding to the current frequency fluctuation. This process continues until the current simulation time reaches the preset simulation duration, at which point the iteration stops and outputs data on the relationship between the frequency and simulation time.

2. The large power grid fast frequency simulation method according to claim 1, characterized in that: The step of constructing a frequency response model according to a frequency response device of the power grid system when the voltage and power angle of the power grid system are stable may also include: Determining whether the voltage of the power grid system is in a stable state after the generator is cut off or DC is locked; When it is determined that the voltage of the power grid system is not in a stable state after the generator is tripped or the DC is blocked, the voltage of the power grid system is adjusted to reach a stable state.

3. The large power grid fast frequency simulation method according to claim 1, characterized in that: The step of constructing a frequency response model according to a frequency response device of the power grid system when the voltage and power angle of the power grid system are stable may also include: Determining whether the power angle of the power grid system is in a stable state after generator tripping or DC blocking; When it is determined that the power angle of the power grid system is not in a stable state after the generator is tripped or the DC blocking is performed, the power angle of the power grid system is adjusted to reach a stable state.

4. The large power grid fast frequency simulation method according to claim 1, characterized in that: The frequency response equipment includes a synchronous machine, a DC transmission module, a new energy electric field and a load; The step of constructing a frequency response model according to the frequency response device of the power grid system includes: A frequency response model corresponding to each frequency response device is established based on electromechanical transient simulation technology. The frequency response model is used to characterize the relationship between the current frequency fluctuation of the power grid system and the active power adjustment of the frequency response device.

5. The large power grid fast frequency simulation method according to claim 1, characterized in that: The step of determining the frequency change rate of the power grid system according to the active power adjustment amount of the frequency response device includes: The frequency change rate of the power grid system is determined according to the active power adjustment amount of the frequency response device, the system active power disturbance amount and the system inertia.

6. The large power grid fast frequency simulation method according to claim 5, characterized in that: The system inertia is determined according to the rotor kinetic energy of the synchronous machine and the total amount of system load.

7. A large power grid fast frequency simulation device, characterized in that: include: A frequency response module, configured to construct a frequency response model based on a frequency response device of the power grid system when the voltage and power angle of the power grid system are stable; a power adjustment module, configured to input a current frequency fluctuation of the power grid system into the frequency response model and output an active power adjustment of the frequency response device corresponding to the current frequency fluctuation; a frequency change determination module, configured to determine a frequency change rate of the power grid system according to an active power adjustment amount of the frequency response device; a frequency updating module, configured to update the current system frequency of the power grid system according to the frequency change rate of the power grid system, and determine whether the current simulation time is less than a preset simulation time; A frequency simulation module is configured to update the current simulation time according to a preset time step when it is determined that the current simulation time is less than the preset simulation duration, and to update the current frequency fluctuation of the power grid system according to the updated current system frequency, and to execute the input of the current frequency fluctuation of the power grid system into the frequency response model, output the active power adjustment of the frequency response device corresponding to the current frequency fluctuation, until the current simulation time reaches the preset simulation duration, and output data on the relationship between the frequency and simulation time.

8. An electronic device, characterized in that: The electronic device includes a memory and a processor, wherein a computer program is stored in the memory. When the computer program is executed by the processor, the processor executes the steps of the large power grid fast frequency simulation method according to any one of claims 1 to 6.

9. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed, the steps of the large power grid fast frequency simulation method according to any one of claims 1 to 6 are implemented.

10. A computer program product, characterized in that The computer program product includes a computer program stored on a non-transitory computer-readable storage medium, wherein the computer program includes program instructions, wherein when the program instructions are executed by a computer, the computer is caused to perform the steps of the large power grid fast frequency simulation method according to any one of claims 1 to 6.

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