Control Method and Device for Inertia Support of Grid-Connected Power Electronic Converters

Abstract

The present application relates to a control method, device and equipment for inertia support applicable to grid-connected power electronic converters, which are applied to new energy distributed generation systems, energy storage inverters or V2G charging and discharging piles. The control method for inertia support applicable to grid-connected power electronic converters processes the obtained frequency data and frequency reference data of the grid connection point of the power electronic converter to obtain inertia compensation data, uses the inertia compensation data as the compensation amount of the power electronic converter to obtain the current inner loop reference data, and controls the operation of the power electronic converter according to the current inner loop reference data and the second current data, so that the power electronic converter has inertia support, without the need to transform the grid-following control strategy of the grid-connected converter into a grid-forming control strategy. This method is simple and practical; it solves the technical problem that the grid-connected power electronic converter of the existing new energy distributed generation system needs to transform the system equipment to realize the inertia support function, resulting in high transformation costs.

Description

Technical Field

[0001] This application relates to the field of power grid technologies, and particularly to a control method, device, and equipment suitable for inertia support of grid-connected power electronic converters. Background Art

[0002] In the context of a high proportion of renewable energy and a high proportion of power electronic devices connecting to the grid, the grid will exhibit characteristics of decreased inertia and damping. New energy distributed generation systems mainly connect to the grid through grid-connected converters. The control method of the power electronic converter will determine the grid characteristics, resulting in limited inertia provided by the converter in new energy distributed generation systems compared to traditional thermal power units. For example, in the field of electric vehicle charging piles, with the development of electric vehicles and fast charging technologies, the power of DC charging and discharging piles is gradually increasing. As an impact load, high-power charging piles may further reduce the inertia and damping characteristics of the local microgrid in new energy distributed generation systems.

[0003] In addition, in recent years, the grid-connected proportion of new energy grid-connected converters mainly including photovoltaic inverters, wind power converters, and energy storage converters has gradually increased. However, most traditional grid-connected converters adopt a grid-following control strategy, which does not have an inertia support function. Studying the inertia support method for grid-connected power electronic converters is attractive. The condition required for inertia support is that there must be an energy source that can perform fast power control. Among them, the grid-following control strategy means that the dq transformation angle fed into the voltage and current double-loop control unit is obtained from the grid-connected point voltage measured by the phase-locked loop, so it is called grid-following.

[0004] Grid-connected converters in traditional power generation systems are generally connected to a relatively stable grid environment and do not need to adopt a grid-forming strategy. Currently, new energy distributed generation systems use a grid-forming control strategy to achieve the inertia support function. However, the equipment transformation difficulty of the grid-forming control strategy is relatively large, and the grid-forming control technology is not yet mature. The cost of transforming the entire control strategy solely to enable the grid-connected converter to have an inertia support function is high. Summary of the Invention

[0005] Embodiments of this application provide a control method, device, and equipment suitable for inertia support of grid-connected power electronic converters, which are applied to new energy distributed generation systems to solve the technical problem that the grid-connected power electronic converters in existing new energy distributed generation systems need to transform the system equipment to achieve the inertia support function, resulting in high transformation costs.

[0006] To achieve the above objective, the embodiments of this application provide the following technical solutions:

[0007] A control method suitable for the inertia support of grid-connected power electronic converters, which is applied to a new energy distributed generation system. The new energy distributed generation system includes an AC port, a power electronic converter, and a DC port connected in sequence. The power electronic converter includes an AC converter, an intermediate capacitor, and a DC converter connected in sequence. The control method suitable for the inertia support of grid-connected power electronic converters includes the following steps:

[0008] Obtain the frequency data, reactive power measurement data, frequency reference data, and reactive power reference data of the grid connection point of the power electronic converter, and obtain the DC voltage reference value and DC voltage measurement value of the intermediate capacitor;

[0009] Determine the inertia compensation data according to the frequency data and the frequency reference data; and obtain the first current data and the second current data by using voltage-current double-loop control according to the reactive power reference data, the reactive power measurement data, the DC voltage reference value, and the DC voltage measurement value;

[0010] Compensate the first current data with the inertia compensation data to obtain the current inner-loop reference data;

[0011] Generate a PWM signal through the current inner-loop control and modulation link according to the current inner-loop reference data and the second current data, and use the PWM signal to control the operation of the grid-connected power electronic converter to realize the inertia support of the grid-connected power electronic converter.

[0012] Preferably, determining the inertia compensation data according to the frequency data and the frequency reference data includes: calculating according to the frequency data and the frequency reference data to obtain a frequency parameter; performing gain link and integral link processing on the frequency parameter to obtain the inertia compensation data.

[0013] Preferably, calculating the frequency parameter according to the frequency data and the frequency reference data includes: calculating the difference between the frequency data and the frequency reference data to obtain the frequency parameter.

[0014] Preferably, compensating the first current data with the inertia compensation data to obtain the current inner-loop reference data includes: adding the inertia compensation data and the first current data to obtain the current inner-loop reference data.

[0015] The present application also provides a control device applicable to the inertia support of a grid-connected power electronic converter, which is applied to a new energy distributed generation system. The new energy distributed generation system includes an AC port, a power electronic converter, and a DC port connected in sequence. The power electronic converter includes an AC converter, an intermediate capacitor, and a DC converter connected in sequence. The control device applicable to the inertia support of the grid-connected power electronic converter includes a data acquisition module, a data processing module, a data compensation module, and a control module;

[0016] The data acquisition module is configured to acquire the frequency data, reactive power measurement data, frequency reference data, and reactive power reference data of the grid connection point of the power electronic converter, and acquire the DC voltage reference value and DC voltage measurement value of the intermediate capacitor;

[0017] The data processing module is configured to determine inertia compensation data according to the frequency data and the frequency reference data; and obtain first current data and second current data by using voltage-current double-loop control according to the reactive power reference data, the reactive power measurement data, the DC voltage reference value, and the DC voltage measurement value;

[0018] The data compensation module is configured to compensate the first current data by using the inertia compensation data to obtain current inner-loop reference data;

[0019] The control module is configured to generate a PWM signal through a current inner-loop control and modulation link according to the current inner-loop reference data and the second current data, and control the operation of the grid-connected power electronic converter by using the PWM signal to achieve the inertia support of the grid-connected power electronic converter.

[0020] Preferably, the data processing module is further configured to calculate according to the frequency data and the frequency reference data to obtain a frequency parameter; perform gain link and integral link processing on the frequency parameter to obtain inertia compensation data.

[0021] Preferably, the data processing module is further configured to calculate the difference between the frequency data and the frequency reference data to obtain a frequency parameter.

[0022] Preferably, the data compensation module is further configured to add the inertia compensation data and the first current data to obtain current inner-loop reference data.

[0023] The present application also provides a storage device, in which multiple program codes are stored, and the program codes are adapted to be loaded and run by a processor to execute the above-mentioned control method applicable to the inertia support of a grid-connected power electronic converter.

[0024] The present application also provides a terminal device, including a processor and a memory;

[0025] The memory is used to store program codes and transmit the program codes to the processor;

[0026] The processor is used to execute the control method applicable to the inertia support of the grid-connected power electronic converter according to the instructions in the program codes.

[0027] As can be seen from the above technical solutions, the embodiments of the present application have the following advantages: The control method, device and equipment applicable to the inertia support of the grid-connected power electronic converter are applied to a new energy distributed generation system. The method includes obtaining frequency data, reactive power measurement data, frequency reference data and reactive power reference data at the grid connection point of the power electronic converter, and obtaining the DC voltage reference value and DC voltage measurement value of the intermediate capacitor; determining inertia compensation data according to the frequency data and the frequency reference data; and obtaining first current data and second current data by using voltage-current double-loop control according to the reactive power reference data, reactive power measurement data, DC voltage reference value and DC voltage measurement value; compensating the first current data with the inertia compensation data to obtain current inner-loop reference data; generating a PWM signal through the current inner-loop control and modulation link according to the current inner-loop reference data and the second current data, and controlling the operation of the grid-connected power electronic converter by using the PWM signal to realize the inertia support of the grid-connected power electronic converter. The control method applicable to the inertia support of the grid-connected power electronic converter processes the obtained frequency data and frequency reference data at the grid connection point of the power electronic converter to obtain inertia compensation data, uses the inertia compensation data as the compensation amount of the power electronic converter to obtain current inner-loop reference data, and controls the operation of the power electronic converter according to the current inner-loop reference data and the second current data, so that the power electronic converter has inertia support, and there is no need to transform the grid-following control strategy of the grid-connected converter into a grid-forming control strategy. This method is simple and practical; it solves the technical problem that the grid-connected power electronic converter of the existing new energy distributed generation system needs to transform the system equipment to realize the inertia support function, and the transformation cost is high. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained according to these drawings without creative efforts.

[0029] Figure 1 It is a flowchart of the steps of the control method applicable to the inertia support of the grid-connected power electronic converter described in the embodiments of the present application;

[0030] Figure 2It is the electrical framework diagram of the new energy distributed generation system in the control method applicable to the inertia support of the grid-connected power electronic converter described in the embodiments of the present application;

[0031] Figure 3 It is the framework diagram of the control device applicable to the inertia support of the grid-connected power electronic converter described in the embodiments of the present application. Detailed implementation manners

[0032] To make the invention objectives, features, and advantages of the present application more obvious and understandable, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the embodiments described below are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

[0033] The embodiments of the present application provide a control method, device, and equipment applicable to the inertia support of the grid-connected power electronic converter, which are applied to the new energy distributed generation system to solve the technical problem that the grid-connected power electronic converter of the existing new energy distributed generation system needs to transform the system equipment to achieve the inertia support function, resulting in high transformation costs. Among them, the control method, device, and equipment applicable to the inertia support of the grid-connected power electronic converter can also be applied to energy storage converters or V2G charging and discharging piles.

[0034] Embodiment 1:

[0035] Figure 1 It is the step flowchart of the control method applicable to the inertia support of the grid-connected power electronic converter described in the embodiments of the present application, Figure 2 It is the electrical framework diagram of the new energy distributed generation system in the control method applicable to the inertia support of the grid-connected power electronic converter described in the embodiments of the present application.

[0036] As Figure 2 shown, the embodiments of the present application provide a control method applicable to the inertia support of the grid-connected power electronic converter, which is applied to the new energy distributed generation system. The new energy distributed generation system includes an AC port, a power electronic converter, and a DC port connected in sequence. The power electronic converter includes an AC converter, an intermediate capacitor, and a DC converter connected in sequence.

[0037] It should be noted that a grid connection point of the power electronic converter is provided between the AC port and the AC converter. The AC converter can be an AC / DC converter, and the DC converter can be a DC / DC converter.

[0038] As Figure 1As shown in the figure, the control method applicable to the inertia support of grid-connected power electronic converters includes the following steps:

[0039] S1. Obtain the frequency data, reactive power measurement data, frequency reference data, and reactive power reference data of the grid connection point of the power electronic converter, and obtain the DC voltage reference value and DC voltage measurement value of the intermediate capacitor.

[0040] It should be noted that in step S1, to obtain the power parameters of the power electronic converter, firstly, the frequency data f_pll, reactive power measurement data Q_measure, frequency reference data f_ref, and reactive power reference data Q_ref of the grid connection point of the power electronic converter are obtained through a phase-locked loop; secondly, the DC voltage reference value Udc_ref and DC voltage measurement value Udc_measure of the intermediate capacitor Cdc in the power electronic converter are obtained. In this embodiment, in the power system, the operation of the power electronic converter adopts voltage-current double-loop control.

[0041] S2. Determine the inertia compensation data according to the frequency data and frequency reference data; and obtain the first current data and the second current data by using voltage-current double-loop control according to the reactive power reference data, reactive power measurement data, DC voltage reference value, and DC voltage measurement value.

[0042] It should be noted that in step S2, firstly, the frequency data and frequency reference data of the power parameters in the power electronic converter are processed to obtain the inertia compensation data; secondly, the reactive power reference data, reactive power measurement data, DC voltage reference value, and DC voltage measurement value of the power parameters in the power electronic converter are processed to obtain the first current data and the second current data. In this embodiment, the reactive power reference data and reactive power measurement data are processed by a PI controller through a power outer loop to obtain the second current data; the DC voltage reference value and DC voltage measurement value are processed by a PI controller through a voltage outer loop to obtain the first current data. Among them, the processing of data by the PI controller through the power outer loop and the PI controller through the voltage outer loop to obtain current data is a mature technology in the field of power systems (such as CN106058861A), which will not be elaborated here.

[0043] Furthermore, determining the inertia compensation data according to the frequency data and frequency reference data includes: calculating according to the frequency data and frequency reference data to obtain a frequency parameter; performing gain link and integral link processing on the frequency parameter to obtain the inertia compensation data. Among them, calculating the frequency parameter according to the frequency data and frequency reference data includes: calculating the difference between the frequency data and the frequency reference data to obtain the frequency parameter.

[0044] It should be noted that the inertia compensation data is a frequency parameter obtained from the difference between the frequency data and the frequency reference data, and the inertia compensation data is obtained by processing the frequency parameter through a gain link and an integration link successively.

[0045] In the embodiment of the present application, determining the gain coefficient in the gain link processing includes:

[0046] Obtain the electrical parameters of the power electronic converter, where the electrical parameters include the rated voltage value of the grid connection point of the power electronic converter, the rated modulation ratio of the power electronic converter, the rated voltage of the intermediate capacitor, and the reactance of the AC side filter of the AC converter;

[0047] Calculate according to the electrical parameters using the gain calculation formula to obtain the gain coefficient.

[0048] It should be noted that the gain calculation formula is:

[0049]

[0050] In the formula, k is the gain coefficient, e pcc0 is the rated voltage value of the grid connection point of the power electronic converter, m0 is the rated modulation ratio of the power electronic converter, U0 is the rated voltage of the intermediate capacitor, X f is the reactance of the AC side filter of the AC converter.

[0051] S3. Compensate the first current data with the inertia compensation data to obtain the current inner loop reference data.

[0052] It should be noted that in step S3, the inertia compensation data is added to the first current data to obtain the current inner loop reference data.

[0053] S4. Generate a PWM signal through the current inner loop control and modulation link according to the current inner loop reference data and the second current data, and use the PWM signal to control the operation of the grid-connected power electronic converter to achieve the inertia support of the grid-connected power electronic converter.

[0054] It should be noted that in step S4, the process of generating a PWM signal by processing data through the current inner loop control and modulation link is a mature technology in the field of power systems. Reference can be made to the chapter on three-phase inverters in books such as "Power Electronics" by Xu Dehong of Zhejiang University, or "Power Electronics" by Wang Zhaoan of Xi'an Jiaotong University, or "Power Electronics" by Ruan Xinbo of Nanjing University of Aeronautics and Astronautics, etc., which will explain the process of generating a PWM signal by processing data through the current inner loop control and modulation link, so it will not be elaborated here.

[0055] A control method applicable to the inertia support of a grid-connected power electronic converter provided by this application is applied to a new energy distributed generation system. The method includes obtaining frequency data, reactive power measurement data, frequency reference data, and reactive power reference data at the grid connection point of the power electronic converter, and obtaining the DC voltage reference value and DC voltage measurement value of the intermediate capacitor; determining inertia compensation data according to the frequency data and frequency reference data; and obtaining first current data and second current data by using voltage-current double-loop control according to the reactive power reference data, reactive power measurement data, DC voltage reference value, and DC voltage measurement value; compensating the first current data with the inertia compensation data to obtain current inner-loop reference data; generating a PWM signal through the current inner-loop control and modulation link according to the current inner-loop reference data and the second current data, and controlling the operation of the grid-connected power electronic converter by using the PWM signal to realize the inertia support of the grid-connected power electronic converter. Through the control method applicable to the inertia support of the grid-connected power electronic converter, the obtained frequency data and frequency reference data at the grid connection point of the power electronic converter are processed to obtain inertia compensation data, the inertia compensation data is used as the compensation amount of the power electronic converter to obtain current inner-loop reference data, and the operation of the power electronic converter is controlled according to the current inner-loop reference data and the second current data, so that the power electronic converter has inertia support, and there is no need to transform the grid-following control strategy of the grid-connected converter into a grid-forming control strategy. This method is simple and practical; it solves the technical problem that to realize the inertia support function of the grid-connected power electronic converter in the existing new energy distributed generation system, the system equipment needs to be transformed, and the transformation cost is high.

[0056] Embodiment 2:

[0057] Figure 3 It is a framework diagram of a control device applicable to the inertia support of a grid-connected power electronic converter according to an embodiment of this application.

[0058] As Figure 3 shown, an embodiment of this application further provides a control device applicable to the inertia support of a grid-connected power electronic converter, which is applied to a new energy distributed generation system. The new energy distributed generation system includes an AC port, a power electronic converter, and a DC port connected in sequence. The power electronic converter includes an AC converter, an intermediate capacitor, and a DC converter connected in sequence. The control device applicable to the inertia support of the grid-connected power electronic converter includes a data acquisition module 10, a data processing module 20, a data compensation module 30, and a control module 40;

[0059] The data acquisition module 10 is used to obtain frequency data, reactive power measurement data, frequency reference data, and reactive power reference data at the grid connection point of the power electronic converter, and obtain the DC voltage reference value and DC voltage measurement value of the intermediate capacitor;

[0060] The data processing module 20 is configured to determine inertia compensation data according to frequency data and frequency reference data; and obtain first current data and second current data by using a voltage-current double-loop control based on reactive power reference data, reactive power measurement data, DC voltage reference value, and DC voltage measurement value.

[0061] The data compensation module 30 is configured to compensate the first current data with the inertia compensation data to obtain current inner-loop reference data.

[0062] The control module 40 is configured to generate a PWM signal through a current inner-loop control and modulation link according to the current inner-loop reference data and the second current data, and control the operation of the grid-connected power electronic converter by using the PWM signal to achieve the inertia support of the grid-connected power electronic converter.

[0063] In an embodiment of the present application, the data processing module 20 is further configured to calculate according to the frequency data and the frequency reference data to obtain a frequency parameter; perform gain link and integral link processing on the frequency parameter to obtain inertia compensation data.

[0064] In an embodiment of the present application, the data processing module 20 is further configured to calculate the difference between the frequency data and the frequency reference data to obtain a frequency parameter.

[0065] In an embodiment of the present application, the data compensation module 30 is further configured to add the inertia compensation data and the first current data to obtain current inner-loop reference data.

[0066] It should be noted that the modules in the device of the second embodiment correspond to the steps in the method of the first embodiment. The content of the control method applicable to the inertia support of the grid-connected power electronic converter has been elaborated in detail in the first embodiment, and the content of the modules in the device will not be elaborated in detail in the second embodiment.

[0067] Embodiment Three:

[0068] An embodiment of the present application provides a storage device, in which multiple program codes are stored, and the program codes are suitable for being loaded and run by a processor to execute the above-mentioned control method applicable to the inertia support of the grid-connected power electronic converter.

[0069] Embodiment Four:

[0070] An embodiment of the present application provides a terminal device, including a processor and a memory;

[0071] The memory is configured to store program codes and transmit the program codes to the processor;

[0072] The processor is configured to execute the above-mentioned control method applicable to the inertia support of the grid-connected power electronic converter according to the instructions in the program codes.

[0073] It should be noted that the processor is used to execute the steps in the above-mentioned embodiment of the control method for inertia support applicable to grid-connected power electronic converters according to the instructions in the program code. Alternatively, when the processor executes the computer program, it realizes the functions of each module / unit in the above-mentioned system / device embodiments.

[0074] Exemplarily, the computer program can be divided into one or more modules / units. One or more modules / units are stored in the memory and executed by the processor to complete this application. One or more modules / units can be a series of computer program instruction segments capable of performing specific functions, and these instruction segments are used to describe the execution process of the computer program in the terminal device.

[0075] The terminal device can be a computing device such as a desktop computer, a notebook, a palm computer, and a cloud server. The terminal device may include, but is not limited to, a processor and a memory. Those skilled in the art can understand that this does not limit the terminal device, and it may include more or fewer components than shown in the figure, or combine certain components, or different components. For example, the terminal device may also include input / output devices, network access devices, a bus, etc.

[0076] The so-called processor may be a central processing unit (CPU), or may also be other general-purpose processors, digital signal processors (DSPs), application specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The general-purpose processor may be a microprocessor, or the processor may also be any conventional processor, etc.

[0077] The memory may be an internal storage unit of the terminal device, such as the hard disk or memory of the terminal device. The memory may also be an external storage device of the terminal device, such as a plug-in hard disk equipped on the terminal device, a smart media card (SMC), a secure digital (SD) card, a flash card, etc. Further, the memory may also include both the internal storage unit and the external storage device of the terminal device. The memory is used to store the computer program and other programs and data required by the terminal device. The memory may also be used to temporarily store the data that has been output or will be output.

[0078] Those skilled in the art can clearly understand that for the convenience and brevity of description, the specific working processes of the systems, devices, and units described above can refer to the corresponding processes in the foregoing method embodiments and will not be elaborated herein.

[0079] In several embodiments provided in the present application, it should be understood that the disclosed systems, devices, and methods can be implemented in other ways. For example, the device embodiments described above are merely illustrative. For example, the division of the units is only a logical function division, and there can be other division methods in actual implementation. For example, 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 displayed or discussed couplings or direct couplings or communication connections to each other can be through some interfaces, and the indirect couplings or communication connections of the devices or units can be in electrical, mechanical, or other forms.

[0080] The units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they can be located in one place or distributed to multiple network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0081] In addition, each functional unit in the various embodiments of the present application can be integrated in a processing unit, or each unit can exist physically alone, or two or more units can be integrated in one unit. The above-mentioned integrated unit can be implemented in the form of hardware or in the form of a software functional unit.

[0082] If the above-mentioned 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 application, in essence, or the part that contributes to the prior art, or all or part of this 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 causing a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of the present application. The foregoing storage medium includes: various media such as USB flash drives, mobile hard disks, read-only memories (ROM, Read-Only Memory), random access memories (RAM, Random Access Memory), magnetic disks, or optical discs that can store program codes.

[0083] As described above, the above embodiments are only used to illustrate the technical solutions of the present application, rather than limiting it; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A control method applicable to the inertia support of grid-connected power electronic converters, which is applied to a new energy distributed generation system. The new energy distributed generation system includes an AC port, a power electronic converter, and a DC port connected in sequence. The power electronic converter includes an AC converter, an intermediate capacitor, and a DC converter connected in sequence. It is characterized in that, The control method applicable to the inertia support of grid-connected power electronic converters includes the following steps: Obtain the frequency data, reactive power measurement data, frequency reference data, and reactive power reference data of the grid connection point of the power electronic converter, and obtain the DC voltage reference value and DC voltage measurement value of the intermediate capacitor; Determine the inertia compensation data according to the frequency data and the frequency reference data; and obtain the first current data and the second current data by using voltage-current double-loop control according to the reactive power reference data, the reactive power measurement data, the DC voltage reference value, and the DC voltage measurement value; Compensate the first current data with the inertia compensation data to obtain the current inner-loop reference data; Generate a PWM signal through the current inner-loop control and modulation link according to the current inner-loop reference data and the second current data, and use the PWM signal to control the operation of the grid-connected power electronic converter to achieve the inertia support of the grid-connected power electronic converter.

2. The control method for inertia support applicable to grid-connected power electronic converters according to claim 1, wherein Determining the inertia compensation data according to the frequency data and the frequency reference data includes: calculating according to the frequency data and the frequency reference data to obtain a frequency parameter; performing gain link and integral link processing on the frequency parameter to obtain the inertia compensation data.

3. The control method for inertia support applicable to grid-connected power electronic converters according to claim 2, characterized in that, Calculating the frequency parameter according to the frequency data and the frequency reference data includes: calculating the difference between the frequency data and the frequency reference data to obtain the frequency parameter.

4. The control method for inertia support applicable to grid-connected power electronic converters according to claim 1, wherein Compensating the first current data with the inertia compensation data to obtain the current inner-loop reference data includes: adding the inertia compensation data and the first current data to obtain the current inner-loop reference data.

5. A control device suitable for the inertia support of grid-connected power electronic converters, which is applied to a new energy distributed generation system. The new energy distributed generation system includes an AC port, a power electronic converter, and a DC port connected in sequence. The power electronic converter includes an AC converter, an intermediate capacitor, and a DC converter connected in sequence. It is characterized in that, The control device applicable to the inertia support of grid-connected power electronic converters includes a data acquisition module, a data processing module, a data compensation module, and a control module; The data acquisition module is used to obtain the frequency data, reactive power measurement data, frequency reference data, and reactive power reference data of the grid connection point of the power electronic converter, and obtain the DC voltage reference value and DC voltage measurement value of the intermediate capacitor; The data processing module is used to determine the inertia compensation data according to the frequency data and the frequency reference data; and obtain the first current data and the second current data by using voltage-current double-loop control according to the reactive power reference data, the reactive power measurement data, the DC voltage reference value, and the DC voltage measurement value; The data compensation module is used to compensate the first current data with the inertia compensation data to obtain the current inner-loop reference data; The control module is used to generate a PWM signal through the current inner-loop control and modulation link according to the current inner-loop reference data and the second current data, and use the PWM signal to control the operation of the grid-connected power electronic converter to achieve the inertia support of the grid-connected power electronic converter.

6. The control device for inertia support applicable to grid-connected power electronic converters according to claim 5, characterized in that, The data processing module is further used to calculate according to the frequency data and the frequency reference data to obtain a frequency parameter; perform gain link and integral link processing on the frequency parameter to obtain the inertia compensation data.

7. The control device for inertia support applicable to grid-connected power electronic converters according to claim 6, characterized in that, The data processing module is further configured to calculate the difference between the frequency data and the frequency reference data to obtain a frequency parameter.

8. The control device for inertia support applicable to grid-connected power electronic converters according to claim 5, characterized in that, The data compensation module is further configured to add the inertia compensation data and the first current data to obtain a reference data for the inner current loop.

9. A storage device that stores multiple program codes, characterized in that, The program code is adapted to be loaded and run by a processor to execute the control method for inertia support of a grid-connected power electronic converter according to any one of claims 1-4.

10. A terminal device, characterized in that, It includes a processor and a memory; The memory is configured to store the program code and transmit the program code to the processor; The processor is configured to execute the control method for inertia support of a grid-connected power electronic converter according to any one of claims 1-4 according to the instructions in the program code.

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