A new type of grid-connected renewable energy transient reactive support strategy and setting method and system, device, and medium

Abstract

The present application relates to the technical field of new energy grid-connected control, and relates to a new type of grid-connected new energy transient reactive support strategy and setting method and system, device, and medium. The method includes: collecting parameters of the new type of grid-connected new energy system, and detecting the fault of the new type of grid-connected new energy system in real time; when a fault of the new type of grid-connected new energy system is detected, the voltage of the grid-connected point of the new type of grid-connected new energy system is detected, and it is determined whether the voltage of the grid-connected point is lower than or equal to the starting threshold. If it is lower than or equal to the starting threshold, the new type of grid-connected new energy system is started to be set; including: performing active setting, performing reactive setting, and performing virtual impedance setting. The present invention provides the setting principle of virtual impedance, realizes the adaptive adjustment of virtual impedance under different transient conditions, effectively suppresses fault current, and improves the reactive support capacity of the system.

Description

Technical Field

[0001] The present application relates to the technical field of new energy grid-connected control, and relates to a novel grid-connected new energy transient reactive power support strategy and setting method, system, device, and medium. Background Art

[0002] At present, grid-following control is the main power generation method used by traditional renewable energy. This method realizes synchronous power transmission between renewable energy and the grid by tracking the voltage at the grid connection point. However, this type of renewable energy has no inertia, low damping, and weak ability to support grid voltage and frequency stability. With the large-scale access of renewable energy, the safe and stable operation of the grid faces severe challenges.

[0003] In this context, grid-type renewable energy power generation technology came into being. The external output of grid-type renewable energy presents voltage source characteristics, which is very easy to overcurrent under transient conditions. This seriously limits its reactive voltage support capacity for the power grid. Nevertheless, as a type of digital power source, the overcurrent capacity of grid-type renewable energy is much lower than that of traditional synchronous generators (6-8 times the rated current), so the current must be controlled within 1.5-2 times the rated current after a fault.

[0004] Current limiting and improving reactive voltage support capabilities have become scientific issues that must be addressed for the large-scale application and promotion of grid-building new energy. Among the existing technical solutions, the power-impedance dual-loop control method has the best performance, which can take into account the current limiting capability, maintain its own stability and grid-building output capability. However, the parameter setting principles under this technical route are not yet clear, especially the setting of virtual impedance needs to be solved urgently. This also makes it impossible for the existing methods to exert their optimal characteristics.

[0005] It should be noted that the information disclosed in the above background technology section is only used to enhance the understanding of the background of the present application, and therefore may include information that does not constitute the prior art known to ordinary technicians in the field. Summary of the invention

[0006] In order to provide a basic understanding of some aspects of the disclosed embodiments, a brief summary is given below. The summary is not an extensive review, nor is it intended to identify key / critical elements or delineate the scope of protection of these embodiments, but rather serves as a prelude to the detailed description that follows.

[0007] The disclosed embodiments provide a novel grid-connected new energy transient reactive support strategy and setting method and system, device, and medium to solve the problem of unclear setting principles for virtual impedance.

[0008] In some embodiments, the method comprises:

[0009] Collect parameters of new network-building new energy systems and detect faults of new network-building new energy systems in real time;

[0010] If a fault of a new type of grid-connected new energy system is detected, the voltage of the grid-connected point of the new type of grid-connected new energy system is detected to determine whether the voltage of the grid-connected point is lower than or equal to the starting threshold. If it is lower than or equal to the starting threshold, the new type of grid-connected new energy system is started for setting; including:

[0011] Perform active power setting, change the active power instruction of the active power loop to the active power sampling value, so that the active unbalanced power of the system is always equal to 0;

[0012] Perform reactive power setting, set the potential reference value in the reactive power loop to the internal potential setting value, and shield the reactive power-voltage droop effect;

[0013] Perform virtual impedance setting, obtain the minimum value of the maximum fault current through the fault current periodic component and the normal operating current phasor, calculate the virtual impedance setting value according to the electrical quantity relationship, and adjust the fault current of the new grid-type new energy system through the virtual impedance setting value.

[0014] Preferably, the start threshold is 0.9 pu.

[0015] Preferably, the internal potential setting value is set according to the grid voltage rating, the grid current rating, the system reactance equivalent value, the grid voltage drop degree, and the inverter internal potential amplitude during normal operation.

[0016] Preferably, the internal potential setting value The setting principles are as follows;

[0017] ,

[0018] ,

[0019] ,

[0020] in, is the rated value of the grid voltage, is the grid-connected current rating, is the system reactance equivalent value, is the potential amplitude inside the inverter during normal operation, is the grid voltage drop degree, is the fault voltage amplitude.

[0021] Preferably, the setting value of the virtual impedance is set according to the system reactance equivalent value, the system equivalent resistance, the grid voltage rating, the grid current rating, the inverter internal potential amplitude during normal operation, the grid voltage drop degree, and the internal potential setting value.

[0022] Preferably, the setting value of the virtual impedance The setting principles are as follows:

[0023] ,

[0024] in, , , All are intermediate parameters.

[0025] In some embodiments, the system comprises:

[0026] Fault detection module: configured to collect parameters of the new network-building type new energy system and detect fault conditions of the new network-building type new energy system in real time;

[0027] A setting start module; configured to detect a fault in the new type of grid-connected new energy system, detect the voltage at the grid connection point of the new type of grid-connected new energy system, and determine whether the voltage at the grid connection point is lower than or equal to the starting threshold. If it is lower than or equal to the starting threshold, start the setting of the new type of grid-connected new energy system;

[0028] System setting module: configured to perform active power setting, reactive power setting, and virtual impedance setting.

[0029] The system tuning module includes:

[0030] The active power setting unit is configured to change the active power instruction of the active power loop to the active power sampling value so that the active unbalanced power of the system is always equal to 0;

[0031] A reactive power setting unit is configured to set a potential reference value within the reactive power loop as an internal potential setting value and shield reactive power-voltage droop effect;

[0032] The virtual impedance setting unit is configured to obtain the minimum value of the maximum fault current through the fault current periodic component and the normal operating current phase, calculate the virtual impedance setting value according to the electrical quantity relationship, and adjust the fault current of the new grid-type new energy system through the virtual impedance setting value.

[0033] In some embodiments, the device includes a processor and a memory storing program instructions, and the processor is configured to execute the new grid-connected new energy transient reactive support strategy and setting method when running the program instructions.

[0034] In some embodiments, the computer-readable storage medium stores a computer program, which, when executed by a processor, implements the novel grid-connected new energy transient reactive support strategy and setting method.

[0035] The embodiments of the present disclosure provide a novel grid-connected new energy transient reactive power support strategy and setting method and system, device, and medium, which can achieve the following technical effects:

[0036] This patent reconstructs the grid-type new energy control architecture, designs a new type of grid-type new energy transient reactive voltage support strategy, and innovatively gives the setting principle of virtual impedance, realizing adaptive adjustment of virtual impedance under different transient conditions, effectively suppressing fault current and improving the system's reactive support capability.

[0037] The above general description and the following description are exemplary and explanatory only and are not intended to limit the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] One or more embodiments are exemplarily described by corresponding drawings, which do not limit the embodiments. Elements with the same reference numerals in the drawings are shown as similar elements, and the drawings do not constitute a scale limitation, and wherein:

[0039] Figure 1 It is a schematic flow chart of the method of the present invention;

[0040] Figure 2 It is the phasor relationship between reactive power command and system voltage and current;

[0041] Figure 3 is the phasor relationship between virtual impedance and system voltage and current;

[0042] Figure 4 The voltage / current waveform of the new control method for the 80% voltage drop scenario;

[0043] Figure 5 It is a schematic diagram of a device provided by an embodiment of the present disclosure.

[0044] In the figure, is the potential phasor in the inverter after the fault, is the potential phasor in the inverter during normal operation, is the normal operating current phasor, is the fault grid voltage phasor, is the grid voltage phasor during normal operation, is the system reactance equivalent value, is the periodic component of the fault current, is the grid voltage phasor during normal operation, is the complex imaginary part, The fault grid current in the phasor relationship between reactive power command and system voltage and current, is the fault grid current in the phasor relationship between the virtual impedance and the system voltage and current, is the equivalent impedance, is the setting resistance, is the voltage, is the power angle to be set, , , , , , , , , They are all position points in the phase relationship diagram; 300 is a new type of grid-type renewable energy transient reactive support strategy and setting device, 301 is a memory, 303 is a bus, and 304 is a processor. DETAILED DESCRIPTION

[0045] In order to be able to understand the features and technical contents of the embodiments of the present disclosure in more detail, the implementation of the embodiments of the present disclosure is described in detail below in conjunction with the accompanying drawings. The attached drawings are for reference only and are not used to limit the embodiments of the present disclosure. In the following technical description, for the convenience of explanation, a full understanding of the disclosed embodiments is provided through multiple details. However, one or more embodiments can still be implemented without these details. In other cases, to simplify the drawings, well-known structures and devices can be simplified for display.

[0046] The terms "first", "second", etc. in the specification and claims of the embodiments of the present disclosure and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the terms used in this way can be interchanged where appropriate, so as to describe the embodiments of the embodiments of the present disclosure described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions.

[0047] Combination Figure 1 , a new type of grid-building type renewable energy transient reactive power support strategy and setting method, especially when the grid fails, the grid-building type renewable energy / energy storage output is very easy to overcurrent when the system fails and the voltage at the access point fluctuates, and under the action of current limiting protection, the transient reactive power output is small and the voltage support capacity is insufficient. Provide a new type of grid-building type transient reactive power support strategy, and innovatively give the virtual impedance setting principle; the method includes:

[0048] S1: Collect parameters of the new type of grid-connected new energy system and detect faults of the new type of grid-connected new energy system in real time; the starting threshold is 0.9pu.

[0049] S2: If a fault of the new type of grid-connected new energy system is detected, the voltage of the grid-connected point of the new type of grid-connected new energy system is detected to determine whether the voltage of the grid-connected point is lower than or equal to the starting threshold. If it is lower than or equal to the starting threshold, the new type of grid-connected new energy system is started for setting; including:

[0050] (1) Active power control loop

[0051] Perform active power setting, change the active power instruction of the active power loop to the active power sampling value, so that the system active unbalanced power is always equal to 0.

[0052] (2) Reactive power control loop

[0053] Perform reactive power setting, set the potential reference value inside the reactive loop to the internal potential setting value, and shield the reactive power-voltage droop effect.

[0054] (3) Virtual impedance loop control

[0055] Perform virtual impedance setting, obtain the minimum value of the maximum fault current through the fault current periodic component and the normal operating current phasor, calculate the virtual impedance setting value according to the electrical quantity relationship, and adjust the fault current of the new grid-type new energy system through the virtual impedance setting value.

[0056] As a refinement of the above embodiment, the active control loop is to suppress the indirect effect of the increase of the power angle on the transient overcurrent. After the system fault is detected, the control scheme of this embodiment instantly changes the active command , making it equal to the active sampling value ,Right now:

[0057] ,

[0058] Under this condition, the system active unbalanced power is always equal to 0, and the system power angle is stable during the fault.

[0059] As a refinement of the above embodiment, the reactive power control loop directly provides an internal potential reference value after a fault. , shielding reactive power-voltage droop effect, that is,

[0060] ,

[0061] in, is the setting value of internal potential. is the reactive power instruction, It is the reactive power sampling value.

[0062] Under the active loop control, the system power angle does not change.

[0063] The internal potential setting value is set according to the grid voltage rating, grid current rating, system reactance equivalent value, grid voltage drop degree, and inverter internal potential amplitude during normal operation.

[0064] Preferably, the internal potential setting value The setting principles are as follows;

[0065] ,

[0066] ,

[0067] ,

[0068] in, is the rated value of the grid voltage, is the grid-connected current rating, is the system reactance equivalent value, is the potential amplitude inside the inverter during normal operation, is the grid voltage drop degree, is the fault voltage amplitude.

[0069] As a refinement of the above embodiment, the setting value of the virtual impedance in the virtual impedance loop control is set according to the system reactance equivalent value, the system equivalent resistance, the grid voltage rating, the grid current rating, the inverter internal potential amplitude during normal operation, the grid voltage drop degree, and the internal potential setting value.

[0070] Specifically, the method of obtaining the minimum value of the maximum fault current through the fault current period component and the normal operating current phase is as follows:

[0071] Fault current periodic component and normal operating current phasor It can be expressed as

[0072] ,

[0073] in, is the potential phasor in the inverter after the fault, is the fault grid voltage phasor, is the potential phasor in the inverter during normal operation, is the grid voltage phasor during normal operation, is the system equivalent resistance, is the equivalent inductance of the system.

[0074] like Figure 2-3 As shown, the fault current periodic component and normal operating current phasor Corresponding to , .vector corresponds to Its projection on the horizontal axis is the initial DC value of attenuation.

[0075] Obviously, the initial value of the attenuated DC is closely related to the fault moment. When the direction is the same as the horizontal axis, the initial value of the attenuated DC is the largest. By superimposing the maximum attenuation DC on the basis of

[0076] ,

[0077] If virtual resistance is increased after a fault , Increase, according to formula (6), Reduce, It decreases. The increase in The impedance angle decreases. According to the fault current periodic component and normal operating current phasor , and The angle decreases.

[0078] In the phasor diagram, as The increase of The end point ( The motion trajectory of point Click to run hour, reaches the minimum value, which is equal to , is the current rating.

[0079] As a refinement of the above embodiment, the virtual impedance setting value is calculated according to the electrical quantity relationship, which can be specifically calculated by the following formula:

[0080] ,

[0081] in, , , All are intermediate parameters.

[0082] It should be noted that the effect is as follows: Figure 4 As shown, the present invention reconstructs the grid-connected new energy control architecture, designs a new type of grid-connected new energy transient reactive voltage support strategy, and innovatively provides the setting principle of virtual impedance, thereby realizing adaptive adjustment of virtual impedance under different transient conditions, effectively suppressing fault current, and improving the reactive support capability of the system.

[0083] Example 2

[0084] A new type of grid-connected renewable energy transient reactive support strategy and setting system, including:

[0085] Fault detection module: It is configured to collect parameters of the new type of network-building new energy system and detect fault conditions of the new type of network-building new energy system in real time.

[0086] A setting start module is configured to detect a fault in a new type of grid-connected new energy system, detect the grid connection point voltage of the new type of grid-connected new energy system, and determine whether the grid connection point voltage is lower than or equal to the starting threshold. If it is lower than or equal to the starting threshold, the setting of the new type of grid-connected new energy system is started.

[0087] System setting module: It is configured to perform active power setting, reactive power setting, and virtual impedance setting; it includes:

[0088] Active power setting changes the active power instruction of the active power loop to the active power sampling value, so that the system active unbalanced power is always equal to 0.

[0089] Reactive power setting sets the potential reference value inside the reactive power loop to the internal potential setting value, and shields the reactive power-voltage droop effect.

[0090] Virtual impedance setting, obtain the minimum value of the maximum fault current through the fault current periodic component and the normal operating current phase, calculate the virtual impedance setting value according to the electrical quantity relationship, and adjust the fault current of the new grid-type new energy system through the virtual impedance setting value.

[0091] Combination Figure 5 As shown, the embodiment of the present disclosure provides a novel grid-forming new energy transient reactive support strategy and setting device 300, including a processor (processor) 304 and a memory (memory) 301. Optionally, the device may also include a communication interface (CommunicationInterface) 302 and a bus 303. Among them, the processor 304, the communication interface 302, and the memory 301 can communicate with each other through the bus 303. The communication interface 302 can be used for information transmission. The processor 304 can call the logic instructions in the memory 301 to execute the novel grid-forming new energy transient reactive support strategy and setting method of the above embodiment.

[0092] In addition, the logic instructions in the memory 301 described above can be implemented in the form of software functional units and can be stored in a computer-readable storage medium when sold or used as an independent product.

[0093] The memory 301 is a computer-readable storage medium that can be used to store software programs and computer executable programs, such as program instructions / modules corresponding to the method in the embodiment of the present disclosure. The processor 304 executes the functional application and data processing by running the program instructions / modules stored in the memory 301, that is, realizing the new grid-type new energy transient reactive support strategy and setting method in the above embodiment.

[0094] The memory 301 may include a program storage area and a data storage area, wherein the program storage area may store an operating system and an application required for at least one function; the data storage area may store data created according to the use of the terminal device, etc. In addition, the memory 301 may include a high-speed random access memory and may also include a non-volatile memory.

[0095] The embodiment of the present disclosure provides a computer-readable storage medium storing computer-executable instructions, wherein the computer-executable instructions are configured to execute the above-mentioned novel grid-connected new energy transient reactive power support strategy and setting method.

[0096] The computer-readable storage medium mentioned above may be a transient computer-readable storage medium or a non-transitory computer-readable storage medium.

[0097] The technical solution of the embodiment of the present disclosure can be embodied in the form of a software product, which is stored in a storage medium and includes one or more instructions for enabling a computer device (which may be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the method described in the embodiment of the present disclosure. The aforementioned storage medium may be a non-transient storage medium, including: a USB flash drive, a mobile hard disk, a read-only memory (ROM, Read-Only Memory), a random access memory (RAM, Random Access Memory), a disk or an optical disk, and other media that can store program codes, or a transient storage medium.

[0098] The above description and the accompanying drawings fully illustrate the embodiments of the present disclosure so that those skilled in the art can practice them. Other embodiments may include structural, logical, electrical, process and other changes. The embodiments represent only possible changes. Unless explicitly required, separate components and functions are optional, and the order of operations may vary. Parts and features of some embodiments may be included in or replace parts and features of other embodiments. Moreover, the words used in this application are only used to describe the embodiments and are not used to limit the claims. As used in the description of the embodiments and the claims, unless the context clearly indicates, the singular forms of "a", "an" and "the" are intended to include plural forms as well. Similarly, the term "and / or" as used in this application refers to any and all possible combinations of one or more associated listings. In addition, when used in this application, the term "comprise" and its variants "comprises" and / or comprising refer to the presence of stated features, wholes, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components and / or groups thereof. In the absence of further restrictions, the elements defined by the sentence "including one..." do not exclude the presence of other identical elements in the process, method or device including the elements. In this article, each embodiment may focus on the differences from other embodiments, and the same and similar parts between the embodiments may refer to each other. For the methods, products, etc. disclosed in the embodiments, if they correspond to the method part disclosed in the embodiments, then the relevant parts can refer to the description of the method part.

[0099] Those skilled in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software may depend on the specific application and design constraints of the technical solution. The technicians may use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of the embodiments of the present disclosure. The technicians may clearly understand that for the convenience and simplicity of description, the specific working processes of the systems, devices and units described above can refer to the corresponding processes in the aforementioned method embodiments, and will not be repeated here.

[0100] In the embodiments disclosed herein, the disclosed methods and products (including but not limited to devices, equipment, etc.) can be implemented in other ways. For example, the device embodiments described above are only schematic. For example, the division of the units can be 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. In addition, the coupling or direct coupling or communication connection between each other shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms. 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 may be located in one place, or they may be distributed on multiple network units. Some or all of the units may be selected according to actual needs to implement this embodiment. In addition, each functional unit in the embodiment of the present disclosure may be integrated in a processing unit, or each unit may exist physically separately, or two or more units may be integrated in one unit.

[0101] The flowchart and block diagram in the accompanying drawings show the possible architecture, function and operation of the system, method and computer program product according to the embodiment of the present disclosure. In this regard, each box in the flowchart or block diagram can represent a module, a program segment or a part of the code, and the module, the program segment or a part of the code contains one or more executable instructions for realizing the specified logical function. In some alternative implementations, the functions marked in the box can also occur in a different order from the order 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, which can depend on the functions involved. In the description corresponding to the flowchart and the block diagram in the accompanying drawings, the operations or steps corresponding to different boxes can also occur in a different order from the order disclosed in the description, and sometimes there is no specific order between different operations or steps. For example, two consecutive operations or steps can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, which can depend on the functions involved. Each block in the block diagrams and / or flowcharts, and combinations of blocks in the block diagrams and / or flowcharts, may be implemented by a dedicated hardware-based system that performs the specified functions or actions, or may be implemented by a combination of dedicated hardware and computer instructions.

Claims

1. A new type of grid-connected renewable energy transient reactive support strategy and setting method, characterized in that: include: Collect parameters of new network-building new energy systems and detect faults of new network-building new energy systems in real time; If a fault of a new type of grid-connected new energy system is detected, the voltage of the grid-connected point of the new type of grid-connected new energy system is detected to determine whether the voltage of the grid-connected point is lower than or equal to the starting threshold. If it is lower than or equal to the starting threshold, the new type of grid-connected new energy system is started for setting; including: Perform active power setting, change the active power instruction of the active power loop to the active power sampling value, so that the active unbalanced power of the system is always equal to 0; Perform reactive power setting, set the potential reference value in the reactive power loop to the internal potential setting value, and shield the reactive power-voltage droop effect; Perform virtual impedance setting, obtain the minimum value of the maximum fault current through the fault current periodic component and the normal operating current phase, calculate the virtual impedance setting value according to the electrical quantity relationship, and set the fault current of the new grid-forming new energy system through the virtual impedance setting value; The minimum value of the maximum fault current is , is the current rating; The setting value of the virtual impedance is set according to the system reactance equivalent value, the system equivalent resistance, the grid voltage rating, the grid current rating, the inverter internal potential amplitude during normal operation, the grid voltage drop degree, and the internal potential setting value; The setting value of the virtual impedance The setting principles are as follows: ， in, , , These are all intermediate parameters. is the system reactance equivalent value, is the system equivalent resistance, is a virtual resistor, is the rated value of the grid voltage, is the grid-connected current rating, is the potential amplitude inside the inverter during normal operation, is the grid voltage drop degree, is the internal potential setting value.

2. According to the novel grid-connected renewable energy transient reactive support strategy and setting method described in claim 1, it is characterized in that: The start threshold is 0.9 pu.

3. The novel grid-connected renewable energy transient reactive support strategy and setting method according to any one of claims 1 or 2, characterized in that: The internal potential setting value is set according to the grid voltage rating, grid current rating, system reactance equivalent value, grid voltage drop degree, and inverter internal potential amplitude during normal operation.

4. The novel grid-connected renewable energy transient reactive support strategy and setting method according to claim 3 is characterized in that: The internal potential setting value The setting principles are as follows; ， ， ， in, is the rated value of the grid voltage, is the grid-connected current rating, is the system reactance equivalent value, is the potential amplitude inside the inverter during normal operation, is the grid voltage drop degree, is the fault voltage amplitude.

5. A new type of grid-connected renewable energy transient reactive support strategy and setting system, characterized in that: Executing the novel grid-connected renewable energy transient reactive support strategy and setting method as described in any one of claims 1 to 4, comprising: Fault detection module: configured to collect parameters of the new network-building type new energy system and detect fault conditions of the new network-building type new energy system in real time; A setting start module; configured to detect a fault in the new type of grid-connected new energy system, detect the voltage at the grid connection point of the new type of grid-connected new energy system, and determine whether the voltage at the grid connection point is lower than or equal to the starting threshold. If it is lower than or equal to the starting threshold, start the setting of the new type of grid-connected new energy system; System setting module: configured to perform active power setting, reactive power setting, and virtual impedance setting.

6. The novel grid-connected renewable energy transient reactive support strategy and setting system according to claim 5 is characterized in that: The system tuning module includes: The active power setting unit is configured to change the active power instruction of the active power loop to the active power sampling value so that the active unbalanced power of the system is always equal to 0; A reactive power setting unit is configured to set a potential reference value within the reactive power loop as an internal potential setting value and shield reactive power-voltage droop effect; The virtual impedance setting unit is configured to obtain the minimum value of the maximum fault current through the fault current periodic component and the normal operating current phasor, calculate the virtual impedance setting value according to the electrical quantity relationship, and adjust the fault current of the new grid-type new energy system through the virtual impedance setting value.

7. A novel grid-building renewable energy transient reactive support strategy and setting device, comprising a processor and a memory storing program instructions, characterized in that: The processor is configured to execute the new grid-connected new energy transient reactive support strategy and setting method as described in any one of claims 1-4 when running the program instructions.

8. A computer-readable storage medium, characterized in that: A computer program is stored thereon, which, when executed by a processor, implements a novel grid-connected new energy transient reactive support strategy and setting method as described in any one of claims 1-4 above.

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