Control method and system for power grid simulation device

Abstract

The invention discloses a control method and system for a power grid simulation device, and belongs to the technical field of new energy access and control. The method comprises the following steps: for a power grid simulation device for broadband impedance measurement of new energy power generation equipment, establishing a fundamental voltage model and a disturbance voltage model of the power grid simulation device; based on a clock synchronization control method, a trigger signal of the power grid simulation device is controlled, and based on the trigger signal, a switching signal of the inversion side of the power grid simulation device is generated according to the fundamental wave voltage model and the disturbance voltage model; and controlling the operation of the power grid simulation device based on the inversion side switching signal of the power grid simulation device. The method can provide technical and equipment support for stability analysis of a large-scale new energy access power system.

Description

Technical Field

[0001] The present invention relates to the field of new energy access and control technology, and more specifically, to a control method and system for a power grid simulation device. Background Art

[0002] As new energy sources such as wind power and photovoltaic power are connected to the AC power grid through power electronic converters, the broadband stability problem of the power system has become more prominent. The impedance analysis method can achieve quantitative evaluation of system stability through black-box impedance measurement, which has received much attention. The impedance of the new energy power generation equipment can be measured as the positive-sequence impedance and negative-sequence impedance of the conventional single-input single-output (SISO), or the impedance matrix of the multiple-input multiple-output (MIMO).

[0003] Current impedance measurement methods mainly focus on MIMO impedance calculation methods, but existing literature does not consider the control method of power grid simulation devices for impedance measurement, and ignores the relationship between disturbance signal control, sampling method and impedance calculation. Impedance measurement data often requires complex phase transformation to reduce the impact of the initial sampling phase, which reduces the accuracy of impedance calculation and seriously affects the reliability of system stability analysis. Summary of the invention

[0004] In view of the above problems, the present invention proposes a control method for a power grid simulation device, comprising:

[0005] For a power grid simulation device for broadband impedance measurement of renewable energy power generation equipment, a fundamental voltage model and a disturbance voltage model of the power grid simulation device are established;

[0006] Based on the clock synchronization control method, the trigger signal of the power grid simulation device is controlled, and based on the trigger signal, the switching signal of the inverter side of the power grid simulation device is generated according to the fundamental voltage model and the disturbance voltage model;

[0007] Based on the inverter-side switch signal of the power grid simulation device, the operation of the power grid simulation device is controlled.

[0008] Optionally, based on a clock synchronization control method, controlling the trigger signal of the power grid simulation device includes:

[0009] When the trigger signal is a low-level signal, no disturbance voltage is injected, and when the trigger signal is a high-level signal, a disturbance voltage is injected;

[0010] When the trigger signal is a low level signal, the enable signal is received, the clock starts to accumulate and the phase of phase a meets the preset conditions, the high level signal is triggered.

[0011] Optionally, based on the trigger signal, generating a switching signal on the inverter side of the power grid simulation device according to the fundamental voltage model and the disturbance voltage model, includes:

[0012] When the trigger signal is a high-level signal, the injection voltage is calculated based on the disturbance voltage model, a given signal is output, the given signal is subjected to coordinate transformation to obtain d-axis and q-axis components of the rotating coordinate system, and the d-axis and q-axis components of the rotating coordinate system are respectively subtracted from the d-axis and q-axis components of the output voltage of the power grid simulation device to generate a current inner loop control reference value of the first controller;

[0013] Subtract the d-axis and q-axis current components of the output current of the power grid simulation device from the current inner loop control reference value of the first controller to generate the d-axis and q-axis components of the modulation wave of the second controller;

[0014] The d-axis and q-axis components of the modulation wave of the second controller are transformed into a three-phase modulation wave in the abc coordinate system, and the three-phase modulation wave in the abc coordinate system is subjected to PWM modulation to generate a switching signal on the inverter side of the power grid simulation device.

[0015] Optionally, the given signal is the sum of the three-phase fundamental voltage and the disturbance voltage.

[0016] Optionally, the first controller includes:

[0017] Proportional-integral link and resonance link;

[0018] The proportional-integral link is used to track the fundamental wave component in the abc coordinate system;

[0019] The resonant link is used to control the disturbance component in the abc coordinate system.

[0020] In another aspect, the present invention further provides a control system for a power grid simulation device, comprising:

[0021] A model building unit, for establishing a fundamental voltage model and a disturbance voltage model of a power grid simulation device for broadband impedance measurement of renewable energy power generation equipment;

[0022] A signal generating unit, configured to control a trigger signal of the power grid simulation device based on a clock synchronization control method, and to generate a switch signal of an inverter side of the power grid simulation device based on the trigger signal and according to the fundamental voltage model and the disturbance voltage model;

[0023] A control unit is used to control the operation of the power grid simulation device based on the inverter-side switch signal of the power grid simulation device.

[0024] Optionally, based on a clock synchronization control method, controlling the trigger signal of the power grid simulation device includes:

[0025] When the trigger signal is a low-level signal, no disturbance voltage is injected, and when the trigger signal is a high-level signal, a disturbance voltage is injected;

[0026] When the trigger signal is a low level signal, the enable signal is received, the clock starts to accumulate and the phase of phase a meets the preset conditions, the high level signal is triggered.

[0027] Optionally, based on the trigger signal, generating a switching signal on the inverter side of the power grid simulation device according to the fundamental voltage model and the disturbance voltage model, includes:

[0028] When the trigger signal is a high-level signal, the injection voltage is calculated based on the disturbance voltage model, a given signal is output, the given signal is subjected to coordinate transformation to obtain d-axis and q-axis components of the rotating coordinate system, and the d-axis and q-axis components of the rotating coordinate system are respectively subtracted from the d-axis and q-axis components of the output voltage of the power grid simulation device to generate a current inner loop control reference value of the first controller;

[0029] Subtract the d-axis and q-axis current components of the output current of the power grid simulation device from the current inner loop control reference value of the first controller to generate the d-axis and q-axis components of the modulation wave of the second controller;

[0030] The d-axis and q-axis components of the modulation wave of the second controller are transformed into a three-phase modulation wave in the abc coordinate system, and the three-phase modulation wave in the abc coordinate system is subjected to PWM modulation to generate a switching signal on the inverter side of the power grid simulation device.

[0031] Optionally, the given signal is the sum of the three-phase fundamental voltage and the disturbance voltage.

[0032] Optionally, the first controller includes:

[0033] Proportional-integral link and resonance link;

[0034] The proportional-integral link is used to track the fundamental wave component in the abc coordinate system;

[0035] The resonant link is used to control the disturbance component in the abc coordinate system.

[0036] In yet another aspect, the present invention further provides a computing device, comprising: one or more processors;

[0037] a processor for executing one or more programs;

[0038] When the one or more programs are executed by the one or more processors, the above-described method is implemented.

[0039] In yet another aspect, the present invention further provides a computer-readable storage medium having a computer program stored thereon, wherein when the computer program is executed, the method described above is implemented.

[0040] Compared with the prior art, the present invention has the following beneficial effects:

[0041] The present invention provides a control method for a power grid simulation device, comprising: establishing a fundamental voltage model and a disturbance voltage model of the power grid simulation device for broadband impedance measurement of renewable energy power generation equipment; controlling the trigger signal of the power grid simulation device based on a clock synchronization control method, and generating a switch signal on the inverter side of the power grid simulation device based on the trigger signal and the fundamental voltage model and the disturbance voltage model; and controlling the operation of the power grid simulation device based on the switch signal on the inverter side of the power grid simulation device. The present invention can provide technical and equipment support for stability analysis of large-scale renewable energy access to power systems. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 is a flow chart of the method of the present invention;

[0043] Figure 2 A topological diagram of a typical power grid simulation device according to an embodiment of the method of the present invention;

[0044] Figure 3 Flow chart of the method for accurately controlling the disturbance signal of the method embodiment of the present invention

[0045] Figure 4 A flow chart of a synchronous sampling control method according to an embodiment of the present invention;

[0046] Figure 5 It is a structural diagram of the system of the present invention. DETAILED DESCRIPTION

[0047] Now, exemplary embodiments of the present invention are described with reference to the accompanying drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. These embodiments are provided to disclose the present invention in detail and completely and to fully convey the scope of the present invention to those skilled in the art. The terms used in the exemplary embodiments shown in the accompanying drawings are not intended to limit the present invention. In the accompanying drawings, the same units / elements are marked with the same reference numerals.

[0048] Unless otherwise specified, the terms (including technical terms) used herein have the commonly understood meanings to those skilled in the art. In addition, it is understood that the terms defined in commonly used dictionaries should be understood to have the same meanings as those in the context of the relevant fields, and should not be understood as idealized or overly formal meanings.

[0049] Embodiment 1:

[0050] The present invention proposes a control method for a power grid simulation device, such as Figure 1 As shown, including:

[0051] Step 1: for a power grid simulation device for broadband impedance measurement of new energy power generation equipment, a fundamental voltage model and a disturbance voltage model of the power grid simulation device are established;

[0052] Step 2: Based on the clock synchronization control method, the trigger signal of the power grid simulation device is controlled, and based on the trigger signal, the switching signal of the inverter side of the power grid simulation device is generated according to the fundamental voltage model and the disturbance voltage model;

[0053] Step 3: Based on the inverter-side switch signal of the power grid simulation device, control the operation of the power grid simulation device.

[0054] After the power grid simulation device is in operation, data sampling can be performed on the renewable energy power generation equipment, and based on the sampled data, the broadband impedance of the renewable energy power generation equipment can be measured.

[0055] Wherein, based on the clock synchronization control method, the trigger signal of the power grid simulation device is controlled, including:

[0056] When the trigger signal is a low-level signal, no disturbance voltage is injected, and when the trigger signal is a high-level signal, a disturbance voltage is injected;

[0057] When the trigger signal is a low level signal, the enable signal is received, the clock starts to accumulate and the phase of phase a meets the preset conditions, the high level signal is triggered.

[0058] Wherein, based on the trigger signal, generating a switching signal of the inverter side of the power grid simulation device according to the fundamental voltage model and the disturbance voltage model, includes:

[0059] When the trigger signal is a high-level signal, the injection voltage is calculated based on the disturbance voltage model, a given signal is output, the given signal is subjected to coordinate transformation to obtain d-axis and q-axis components of the rotating coordinate system, and the d-axis and q-axis components of the rotating coordinate system are respectively subtracted from the d-axis and q-axis components of the output voltage of the power grid simulation device to generate a current inner loop control reference value of the first controller;

[0060] Subtract the d-axis and q-axis current components of the output current of the power grid simulation device from the current inner loop control reference value of the first controller to generate the d-axis and q-axis components of the modulation wave of the second controller;

[0061] The d-axis and q-axis components of the modulation wave of the second controller are transformed into a three-phase modulation wave in the abc coordinate system, and the three-phase modulation wave in the abc coordinate system is subjected to PWM modulation to generate a switching signal on the inverter side of the power grid simulation device.

[0062] Among them, the given signal is the sum of the three-phase fundamental voltage and the disturbance voltage.

[0063] Wherein, the first controller comprises:

[0064] Proportional-integral link and resonance link;

[0065] The proportional-integral link is used to track the fundamental wave component in the abc coordinate system;

[0066] The resonant link is used to control the disturbance component in the abc coordinate system.

[0067] The present invention is further described below with reference to specific cases:

[0068] The power grid simulation device generally includes a grid-side transformer, a rectifier link, an inverter link, and a machine-side transformer. The inverter link is generally composed of a cascade of multi-level converters and is the core of the power grid simulation function. A typical power grid simulation device topology is as follows: Figure 2 shown.

[0069] The present invention includes two parts, a method for accurately controlling a disturbance signal and a method for clock synchronization control, which are specifically as follows:

[0070] (1) Accurate control method of disturbance signal, such as Figure 3 As shown, including:

[0071] The fundamental voltage and disturbance voltage of the power grid simulation device are given as:

[0072]

[0073] Among them, V a 、V b 、V c are the three-phase fundamental voltages, V1 is the fundamental voltage amplitude, f1 is the fundamental frequency, θ1 is the initial phase of the a-phase fundamental voltage; V ah 、V bh 、V ch They are the three-phase disturbance voltage, V h is the disturbance voltage amplitude, f h is the disturbance voltage frequency, θ ah ,θ bh ,θ ch is the three-phase disturbance voltage phase, and the disturbance voltage phase sequence is automatically modified by θ ah ,θ bh ,θ chto configure.

[0074] Whether the disturbance voltage is injected is controlled by the trigger signal of the clock synchronization control method. When the trigger signal is low, the disturbance voltage is not injected. When the trigger signal is high, the disturbance voltage is injected. The disturbance voltage is set by the frequency f h , phase θ ah ,θ bh ,θ ch Calculated according to formula (2). When the trigger signal is at a high level, the given signal of the power grid simulation device is the sum of the three-phase fundamental voltage and the disturbance voltage. After coordinate transformation (abc / dq), the d and q axis components V of the rotating coordinate system are obtained. d *、V q *, which are respectively related to the d-axis and q-axis components of the output voltage of the power grid simulation device V d 、V q The difference is then generated through the G1(s) controller to generate the current inner loop control reference value i d *、i q *Right now

[0075]

[0076] The G1(s) controller includes a proportional-integral link and a resonant link. The proportional-integral link can realize stable tracking of the DC component, i.e., the fundamental component in the abc coordinate system, and the resonant link can realize precise control of the AC component, i.e., the disturbance component in the abc coordinate system.

[0077] The current inner loop reference value and the d-axis and q-axis current components i of the output current of the power grid simulation device d 、i q The difference is made respectively, and the d and q axis components v of the modulated wave are generated through the G2(s) controller md *、v mq *Right now

[0078]

[0079] The G2(s) controller can play a similar role as the G1(s) controller. md *、v mq *After coordinate transformation (dq / abc), we can get the three-phase modulation wave v in the abc coordinate system a *、v b *、v c *, generate the inverter side switching signal of the power grid simulation device through PWM modulation.

[0080] (2) Clock synchronization control methods, such as Figure 4 As shown, including:

[0081] During the impedance calculation process, the disturbance voltage and current signals need to be analyzed by Fourier analysis. If an integer multiple of 2π is selected as the clock synchronization reference, the phase of phase a should satisfy:

[0082] 2πf1t+θ1=2kπ (7)

[0083] Wherein k is a positive integer.

[0084] In order to match the discrete control mode of the power grid simulation device, (7) is converted into an approximate form:

[0085]

[0086] In the formula δ To set the threshold, T1 = 1 / f1.

[0087] When the system is running, it is first initialized, the trigger signal is at a low level, and waits for the host computer command. When the host computer sends an enable signal, the clock starts to accumulate. When equation (8) is satisfied, the trigger signal is high voltage, enabling the disturbance signal to occur and enabling data sampling.

[0088] By accurately controlling the disturbance signal of the power grid simulation device, the control accuracy of the output disturbance signal is improved; through clock synchronization control, the influence of the initial phase on the impedance measurement is avoided; no complex phase transformation is required during sampling data analysis, which effectively reduces the amplitude and phase errors of impedance calculation, and is suitable for SISO and MIMO impedance measurement of new energy power generation equipment.

[0089] Embodiment 2:

[0090] The present invention also proposes a control system 200 for a power grid simulation device, such as Figure 5 As shown, including:

[0091] A model building unit 201 is used to establish a fundamental voltage model and a disturbance voltage model of a power grid simulation device for broadband impedance measurement of renewable energy power generation equipment;

[0092] A signal generating unit 202, configured to control a trigger signal of the power grid simulation device based on a clock synchronization control method, and generate a switch signal of an inverter side of the power grid simulation device based on the trigger signal and according to the fundamental voltage model and the disturbance voltage model;

[0093] The control unit 203 is used to control the operation of the power grid simulation device based on the inverter-side switch signal of the power grid simulation device.

[0094] After the power grid simulation device is in operation, data sampling can be performed on the renewable energy power generation equipment, and based on the sampled data, the broadband impedance of the renewable energy power generation equipment can be measured.

[0095] Wherein, based on the clock synchronization control method, the trigger signal of the power grid simulation device is controlled, including:

[0096] When the trigger signal is a low-level signal, no disturbance voltage is injected, and when the trigger signal is a high-level signal, a disturbance voltage is injected;

[0097] When the trigger signal is a low level signal, the enable signal is received, the clock starts to accumulate and the phase of phase a meets the preset conditions, the high level signal is triggered.

[0098] Wherein, based on the trigger signal, generating a switching signal of the inverter side of the power grid simulation device according to the fundamental voltage model and the disturbance voltage model, includes:

[0099] When the trigger signal is a high-level signal, the injection voltage is calculated based on the disturbance voltage model, a given signal is output, the given signal is subjected to coordinate transformation to obtain d-axis and q-axis components of the rotating coordinate system, and the d-axis and q-axis components of the rotating coordinate system are respectively subtracted from the d-axis and q-axis components of the output voltage of the power grid simulation device to generate a current inner loop control reference value of the first controller;

[0100] Subtract the d-axis and q-axis current components of the output current of the power grid simulation device from the current inner loop control reference value of the first controller to generate the d-axis and q-axis components of the modulation wave of the second controller;

[0101] The d-axis and q-axis components of the modulation wave of the second controller are transformed into a three-phase modulation wave in the abc coordinate system, and the three-phase modulation wave in the abc coordinate system is subjected to PWM modulation to generate a switching signal on the inverter side of the power grid simulation device.

[0102] Among them, the given signal is the sum of the three-phase fundamental voltage and the disturbance voltage.

[0103] Wherein, the first controller comprises:

[0104] Proportional-integral link and resonance link;

[0105] The proportional-integral link is used to track the fundamental wave component in the abc coordinate system;

[0106] The resonant link is used to control the disturbance component in the abc coordinate system.

[0107] The present invention can provide technical and equipment support for stability analysis of large-scale renewable energy access to power systems.

[0108] Embodiment 3:

[0109] Based on the same inventive concept, the present invention also provides a computer device, which includes a processor and a memory, wherein the memory is used to store a computer program, the computer program includes program instructions, and the processor is used to execute the program instructions stored in the computer storage medium. The processor may be a central processing unit (CPU), or other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA) or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components, etc. It is the computing core and control core of the terminal, which is suitable for implementing one or more instructions, and is specifically suitable for loading and executing one or more instructions in the computer storage medium to implement the corresponding method flow or corresponding functions, so as to implement the steps of the method in the above embodiment.

[0110] Embodiment 4:

[0111] Based on the same inventive concept, the present invention also provides a storage medium, specifically a computer-readable storage medium (Memory), which is a memory device in a computer device for storing programs and data. It is understandable that the computer-readable storage medium here can include both a built-in storage medium in a computer device and an extended storage medium supported by the computer device. The computer-readable storage medium provides a storage space, which stores the operating system of the terminal. In addition, one or more instructions suitable for being loaded and executed by a processor are also stored in the storage space, and these instructions can be one or more computer programs (including program codes). It should be noted that the computer-readable storage medium here can be a high-speed RAM memory or a non-volatile memory, such as at least one disk memory. The processor can load and execute one or more instructions stored in the computer-readable storage medium to implement the steps of the method in the above embodiment.

[0112] It will be appreciated by those skilled in the art that embodiments of the present invention may be provided as methods, systems, or computer program products. Therefore, the present invention may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, the present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program codes. The schemes in the embodiments of the present invention may be implemented in various computer languages, for example, object-oriented programming language Java and literal scripting language JavaScript, etc.

[0113] The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0114] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0115] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0116] Although the preferred embodiments of the present invention have been described, those skilled in the art may make other changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present invention.

[0117] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A control method for a power grid simulation device, characterized in that: include: For a power grid simulation device for broadband impedance measurement of renewable energy power generation equipment, a fundamental voltage model and a disturbance voltage model of the power grid simulation device are established; Based on the clock synchronization control method, the trigger signal of the power grid simulation device is controlled, and based on the trigger signal, the switching signal of the inverter side of the power grid simulation device is generated according to the fundamental voltage model and the disturbance voltage model; Based on the inverter-side switch signal of the power grid simulation device, the operation of the power grid simulation device is controlled.

2. The method according to claim 1, characterized in that The method of controlling the trigger signal of the power grid simulation device based on the clock synchronization control method includes: When the trigger signal is a low-level signal, no disturbance voltage is injected, and when the trigger signal is a high-level signal, a disturbance voltage is injected; When the trigger signal is a low level signal, an enable signal is received, the clock starts to accumulate, and when the phase of phase a meets the preset condition, the high level signal is triggered.

3. The method according to claim 1, characterized in that The generating, based on the trigger signal and according to the fundamental voltage model and the disturbance voltage model, a switch signal of the inverter side of the power grid simulation device comprises: When the trigger signal is a high-level signal, the injection voltage is calculated based on the disturbance voltage model, a given signal is output, the given signal is subjected to coordinate transformation to obtain d-axis and q-axis components of the rotating coordinate system, and the d-axis and q-axis components of the rotating coordinate system are respectively subtracted from the d-axis and q-axis components of the output voltage of the power grid simulation device to generate a current inner loop control reference value of the first controller; Subtract the d-axis and q-axis current components of the output current of the power grid simulation device from the current inner loop control reference value of the first controller to generate the d-axis and q-axis components of the modulation wave of the second controller; The d-axis and q-axis components of the modulation wave of the second controller are transformed into a three-phase modulation wave in the abc coordinate system, and the three-phase modulation wave in the abc coordinate system is subjected to PWM modulation to generate a switching signal on the inverter side of the power grid simulation device.

4. The method according to claim 3, characterized in that The given signal is the sum of the three-phase fundamental voltage and the disturbance voltage.

5. The method according to claim 3, characterized in that: The first controller comprises: Proportional-integral link and resonance link; The proportional-integral link is used to track the fundamental wave component in the abc coordinate system; The resonant link is used to control the disturbance component in the abc coordinate system.

6. A control system for a power grid simulation device, characterized in that: include: A model building unit, for establishing a fundamental voltage model and a disturbance voltage model of a power grid simulation device for broadband impedance measurement of renewable energy power generation equipment; A signal generating unit, configured to control a trigger signal of the power grid simulation device based on a clock synchronization control method, and to generate a switch signal of an inverter side of the power grid simulation device based on the trigger signal and according to the fundamental voltage model and the disturbance voltage model; A control unit is used to control the operation of the power grid simulation device based on the inverter-side switch signal of the power grid simulation device.

7. The system according to claim 6, characterized in that The method of controlling the trigger signal of the power grid simulation device based on the clock synchronization control method includes: When the trigger signal is a low-level signal, no disturbance voltage is injected, and when the trigger signal is a high-level signal, a disturbance voltage is injected; When the trigger signal is a low level signal, an enable signal is received, the clock starts to accumulate, and when the phase of phase a meets the preset condition, the high level signal is triggered.

8. The system according to claim 6, characterized in that The generating, based on the trigger signal and according to the fundamental voltage model and the disturbance voltage model, a switch signal of the inverter side of the power grid simulation device comprises: When the trigger signal is a high-level signal, the injection voltage is calculated based on the disturbance voltage model, a given signal is output, the given signal is subjected to coordinate transformation to obtain d-axis and q-axis components of the rotating coordinate system, and the d-axis and q-axis components of the rotating coordinate system are respectively subtracted from the d-axis and q-axis components of the output voltage of the power grid simulation device to generate a current inner loop control reference value of the first controller; Subtract the d-axis and q-axis current components of the output current of the power grid simulation device from the current inner loop control reference value of the first controller to generate the d-axis and q-axis components of the modulation wave of the second controller; The d-axis and q-axis components of the modulation wave of the second controller are transformed into a three-phase modulation wave in the abc coordinate system, and the three-phase modulation wave in the abc coordinate system is subjected to PWM modulation to generate a switching signal on the inverter side of the power grid simulation device.

9. The system according to claim 8, characterized in that The given signal is the sum of the three-phase fundamental voltage and the disturbance voltage.

10. The method according to claim 8, characterized in that The first controller comprises: Proportional-integral link and resonance link; The proportional-integral link is used to track the fundamental wave component in the abc coordinate system; The resonant link is used to control the disturbance component in the abc coordinate system.

11. A computer device, characterized in that: include: one or more processors; a processor for executing one or more programs; When the one or more programs are executed by the one or more processors, the method according to any one of claims 1 to 5 is implemented.

12. A computer-readable storage medium, characterized in that: A computer program is stored thereon, and when the computer program is executed, the method according to any one of claims 1 to 5 is implemented.

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