Large power grid fast frequency simulation method and device, electronic equipment and medium

Abstract

The invention relates to the technical field of power grid simulation, and discloses a large power grid rapid frequency simulation method and device, electronic equipment and a medium, and the method carries out rapid frequency simulation response under the condition that the voltage of a power grid system is stable and the power angle is stable, thereby neglecting the interference of reactive power distribution and a grid frame on frequency response. A frequency response model is constructed through frequency response equipment of the power grid system, and the relation between frequency fluctuation and the active power adjustment amount of the frequency response equipment is determined through the frequency response model, so that the frequency change rate of the power grid system is determined, and change relation data of frequency and simulation time are obtained through simulation. And the working efficiency of large-batch frequency simulation analysis is greatly improved.

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] At present, the frequency simulation of large power grids mainly adopts electromagnetic transient simulation technology or electromechanical transient simulation technology. For AC large power grids with a high proportion of hydropower, due to the water hammer effect, the frequency regulation response of the turbine speed regulator is slow. When it cooperates with traditional thermal power units and energy storage devices with faster frequency regulation speed, it is very easy to have a scenario where the grid frequency can only stabilize 60 to 80 seconds after the active disturbance.

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

[0004] In view of this, the present invention provides a method, device, electronic device and medium for fast 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 large power grid fast frequency simulation method, comprising:

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

[0007] Inputting the current frequency fluctuation amount 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 amount;

[0008] Determining the frequency change rate of the power grid system according to the 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 time, 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, and the process 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, until the current simulation time reaches the preset simulation time, the iteration stops and the frequency and simulation time change relationship data is output.

[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 also includes:

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

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

[0014] 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 also includes:

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

[0016] 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 switched off 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 according to 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, 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.

[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 amount of system load.

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

[0023] A frequency response module, used to construct 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;

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

[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, 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 a preset simulation time;

[0027] A frequency simulation module is used to update the current simulation time according to the preset time step when it is determined that the current simulation time is less than the preset simulation time, and to update the current frequency fluctuation of the power grid system according to the updated current system frequency, and to execute the current frequency fluctuation of the power grid system input 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 time, and output the change relationship data of 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 the memory stores a computer program, 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, and when the computer program is executed, the steps of the large power grid fast frequency simulation method as described in the first aspect are implemented.

[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 executes 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 when the voltage and power angle of the power grid system are stable, thereby ignoring the interference of reactive power distribution and grid 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 fluctuations 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 An application environment diagram of a large power grid fast 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 diagram of the structure of a large power grid fast frequency simulation device provided by an embodiment of the present invention;

[0036] Figure 5 A schematic diagram of the structure 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 scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in 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 creative work are 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. Among them, each device node of the power grid system communicates with the server 102 through the network. The data storage system can store the data that the server 102 needs to process. The data storage system can be integrated on the server 102, or it can be placed on the cloud or other network servers. The server 102 can be an independent physical server, or a server cluster or distributed system composed of multiple physical servers, or a cloud server that provides cloud computing services.

[0039] like Figure 2As shown, the embodiment of the present application provides a large power grid fast frequency simulation method, 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. Among them:

[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 should be noted that the frequency fluctuation of the power grid system is caused by the imbalance between the active power emitted by the system equipment and the active power absorbed by the equipment. Unlike the local characteristics of reactive power affecting voltage, the impact of active power on frequency is generally considered to have global characteristics. When the voltage and power angle of the power grid system are stable, that is, when the reactive power distribution and grid structure are ignored, the frequency response is performed.

[0042] It can be understood that when the reactive power support of the power grid system is sufficient and the voltage of each node is maintained at 1.0pu before and after the disturbance, the voltage is stable. Before step S1, it should be determined whether the voltage of the power grid system after the generator is cut off or the DC is locked is in a stable state; when it is determined that the voltage of the power grid system after the generator is cut off or the DC is locked is not in a stable state, the voltage of the power grid system is adjusted to 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 machine is cut off or the DC is locked, it means that the reactive strength of the power grid is insufficient, and 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 will 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 locked, it is determined that the voltage of the power grid system is stable, and the next step is started.

[0045] In addition, when the frequency spatiotemporal distribution characteristics and the instability factors of the synchronous machine power angle are ignored in the power grid system, 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 speed (node ​​frequency) of different nodes of the power grid may be slightly different, but the deviation is negligible. According to frequency simulation experience, for DC blocking (transmission power 8000MW), the frequencies of different units will be different at the moment of disturbance, but the difference is not large, and the steady-state frequency is consistent. However, if after cutting the machine or DC blocking, the frequency deviation of different nodes is too large due to the power angle problem, the power angle instability problem should be solved first. Therefore, before step S1, it should be determined whether the power angle of the power grid system after cutting the machine or DC blocking is in a stable state; when it is determined that the power angle of the power grid system after cutting the machine or DC blocking is not in a stable state, the power angle of the power grid system is adjusted to 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 the DC lockout, it means that the power angle problem causes the frequency deviation of different nodes to be too large. The power angle of the power grid system is adjusted to reach a stable state. The power angle of the power grid system can be adjusted by coordinating the work of the speed governor and the excitation regulation. The speed governor adjusts the output power of the prime mover to respond to frequency changes. When the frequency decreases, the mechanical power input is increased, and vice versa. This helps to keep the speed of the synchronous generator close to the rated value. And the reactive power output is adjusted by changing the excitation current of the generator, thereby affecting the voltage level of the generator. A good excitation control system can respond quickly 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] Among them, the synchronous machine is equipped with a speed regulator. When the grid frequency drops, the speed regulator increases the output of the prime mover (such as a steam turbine or a water turbine), thereby increasing the power output of the generator and helping to restore the frequency. When the frequency is abnormal on the AC side, the DC transmission module can increase or decrease the power flow by adjusting the operation mode of the converter station, thereby affecting the frequency state of the connected AC network. The new energy electric field can participate in the frequency response through energy storage devices or by adjusting the inverter control strategy. For example, when the frequency drop is detected, the pre-stored energy can be quickly released; when the frequency is high, it may choose to temporarily reduce the amount of electricity delivered to the grid or absorb additional energy for storage. Loads include interruptible loads, demand-side response, and other forms. These measures allow grid operators to temporarily cut off the services of some non-critical users or transfer certain types of electricity consumption to other time periods as needed. Although this method directly reduces the power supply, it helps to maintain the supply and demand balance and frequency stability of the entire system as a whole.

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

[0051] Based on the 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, and a 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), a conventional DC establishes a frequency response model based on FLC control (DS model card), a flexible DC establishes a frequency response model (DK model card), a new energy establishes a frequency response model (EY model card), a constant power / constant impedance / constant current load establishes a frequency response model (LB model card), and a 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] In the formula, , , , They are the active power adjustment of synchronous machine, DC transmission module, new energy electric field and load, , , , are the frequency response functions of synchronous machine, DC transmission module, new energy electric field and load respectively. is the current frequency fluctuation of the power grid system, wherein 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: 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.

[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 according to the active power adjustment of the frequency response device, the system active power disturbance and the system inertia, that is:

[0060]

[0061] In the formula, is the system active power disturbance, generally the generator cutting capacity, load cutting 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 according to the rotor kinetic energy of the synchronous machine and the total system load. That is:

[0062]

[0063] In the formula, 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 time, 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, and 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, until the current simulation time reaches the preset simulation time, the iteration stops and the frequency and simulation time change relationship data is output.

[0067] Among them, by setting the simulation time and simulation step. When it is judged that the current simulation time is less than the preset simulation time, it means that the simulation has not ended, and 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, and the frequency of the next simulation moment is determined, until the current simulation time reaches the preset simulation time, the iteration stops and the change relationship data of 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 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 the frequency and 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 also provides a large power grid fast frequency simulation device for implementing the large power grid fast frequency simulation method involved above.

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

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

[0072] The frequency response module 100 is used to construct a frequency response model according to 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 used to input the current frequency fluctuation of the power grid system into the frequency response model, and output the active power adjustment amount of the frequency response device corresponding to the current frequency fluctuation amount;

[0074] The frequency change determination module 300 is used to determine the frequency change rate of the power grid system according to the active power adjustment amount of the frequency response device;

[0075] The frequency updating 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 used to update the current simulation time according to the preset time step when it is determined that the current simulation time is less than the preset simulation time, and to update the current frequency fluctuation of the power grid system according to the updated current system frequency, and to execute the current frequency fluctuation of the power grid system input 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 time, and output the change relationship data of the frequency and simulation time.

[0077] In some embodiments, the device also includes: a voltage adjustment module, which is used to determine whether the voltage of the power grid system is in a stable state after power off or DC blocking; when it is determined that the voltage of the power grid system is not in a stable state after power off or DC blocking, the voltage of the power grid system is adjusted to a stable state.

[0078] In some embodiments, the device also 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 power cutting or DC locking; when it is determined that the power angle of the power grid system is not in a stable state after power cutting or DC locking, 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 DC 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 used to determine the frequency change rate of the power grid system according to the active power adjustment amount of the frequency response device, the system active power disturbance amount and the 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 fast frequency simulation method 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, wherein 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 can clearly understand that, for the convenience and brevity of description, the specific working processes of the above-described systems, electronic devices, computer storage media and the like can refer to the corresponding processes in the aforementioned method embodiments 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 inherent to these processes, methods, products or apparatus.

[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, a program segment or a part of a code, and the module, a program segment or a part of a 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 from 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 only schematic. For example, the division of the units is only a logical function division. There may be other division methods in actual implementation, 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 separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0090] In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of software functional units.

[0091] If the integrated unit is implemented in the form of 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 is essentially or the part that contributes to the prior art or all or part of the technical solution can be embodied in the form of a software product. The computer software product is stored in a storage medium, including several instructions for executing all or part of the steps of the method described in each embodiment of the present invention through a computer device (which can be a personal computer, server, or network device, etc.). The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (full name in English: Read-Only Memory, English abbreviation: ROM), random access memory (full name in English: Random Access Memory, English abbreviation: RAM), disk or optical disk and other media that can store program codes.

[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 the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may 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 large power grid fast frequency simulation method, 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 a frequency response device of the power grid system; Inputting the current frequency fluctuation amount 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 amount; Determining the frequency change rate of the power grid system according to the 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 time, 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, and the process 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, until the current simulation time reaches the preset simulation time, the iteration stops and the frequency and simulation time change relationship data is output.

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 also includes: Determining whether the voltage of the power grid system after power cut-off or DC blocking is in a stable state; When it is determined that the voltage of the power grid system after the generator is cut off or the DC blocking is not in a stable state, 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 also includes: Determining whether the power angle of the power grid system after machine cutting or DC blocking is in a stable state; 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 switched off 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 comprises: A frequency response model corresponding to each frequency response device is established 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.

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 comprises: 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, used to construct 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; A power adjustment module, configured to input a current frequency fluctuation amount of the power grid system into the frequency response model, and output an active power adjustment amount of the frequency response device corresponding to the current frequency fluctuation amount; 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, 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 a preset simulation time; A frequency simulation module is used to update the current simulation time according to the preset time step when it is determined that the current simulation time is less than the preset simulation time, and to update the current frequency fluctuation of the power grid system according to the updated current system frequency, and to execute the current frequency fluctuation of the power grid system input 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 time, and output the change relationship data of 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, and when the computer program is executed by the processor, the processor executes the steps of the large power grid fast frequency simulation method as described in 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 comprises 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 execute the steps of the large power grid fast frequency simulation method as claimed in any one of claims 1 to 6.

Images