A method, system and device for determining interference scenarios of network-building new energy synchronous stable control

Abstract

The present application relates to the technical field of protection and control of new energy power systems, and to a method, system, and device for determining interference scenarios for synchronous stable control of grid-type new energy. The method includes: obtaining parameters of a grid-type new energy power system; calculating the acceleration area and maximum deceleration area without considering the damping term, as well as the acceleration area and maximum deceleration area considering the damping term; calculating the minimum value of the grid voltage without considering the damping term, and the minimum value of the grid voltage considering the damping term; comparing the system equivalent potential amplitude with the minimum value of the grid voltage, and dividing the voltage drop into a stable scenario, a small interference scenario, and a large interference scenario according to the comparison result. The present invention can obtain the interference interval in which the voltage drop is located by accurate calculation, and then improve the synchronization stability through corresponding methods.

Description

Technical Field

[0001] The present application relates to the field of protection and control technology for new energy power systems, and to a method, system and device for determining interference scenarios for synchronous and stable control of grid-connected new energy. Background Art

[0002] At present, with the increasing penetration rate of new energy, the safe and stable operation of the power system faces major challenges. This is directly related to the control of new energy. The traditional grid-following control has small inertia and weak support for the stable operation of the power grid. To solve this problem, the grid-building new energy power generation technology came into being. It simulates the output characteristics of traditional synchronous generators, autonomously resists grid disturbances, and supports the stable operation of the system. It has been demonstrated in many new energy sites across the country. However, grid-building new energy faces serious synchronous instability problems when it suffers from system disturbances. And compared with traditional synchronous generators, the synchronous instability characteristics of grid-building new energy are more complex.

[0003] Since the control parameter optimization method does not change the voltage source properties under transient conditions of new energy, it has become the mainstream technical route for solving synchronous stability problems. However, it also has technical deficiencies, namely: if the power reduction operation mode is adopted under small disturbance conditions, it will lead to unnecessary power waste; if the inertia adjustment method is adopted under large disturbance conditions, there is a risk of synchronous instability. How to define small disturbance scenarios and large disturbance scenarios from the perspective of synchronous stability is a scientific problem that needs to be solved urgently. This is also an important prerequisite for implementing any synchronous stability control strategy.

[0004] 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

[0005] 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.

[0006] The disclosed embodiments provide a method, system and device for determining interference scenarios for synchronous and stable control of new energy networks, so as to solve the technical problem of how to define small interference scenarios and large interference scenarios.

[0007] In some embodiments, the method comprises:

[0008] Obtain active power reference value, line reactance, grid connection point voltage, equivalent potential amplitude, and equivalent potential amplitude before fault of grid-connected new energy power system;

[0009] Calculate the acceleration area and maximum deceleration area without considering the damping term and the acceleration area and maximum deceleration area with considering the damping term;

[0010] According to the principle that the acceleration area of ​​the power angle curve is less than the maximum deceleration area, the grid voltage has a minimum value when the damping term is not considered. , Considering the damping term, the grid voltage has a minimum value ;

[0011] The system equivalent potential amplitude and , Compare and classify the voltage drop into stable scenario, small interference scenario and large interference scenario according to the comparison result.

[0012] Preferably, the calculation does not consider the damping term and the grid voltage has a minimum value , the specific method is as follows:

[0013] Calculate the acceleration area without considering the damping term and maximum deceleration area ;

[0014] According to the power angle curve, the acceleration area is less than the maximum deceleration area, and the inequality is established. ;

[0015] Solving inequalities using the bisection method Get the minimum value of the grid voltage .

[0016] Preferably, the acceleration area without considering the damping term is The calculation formula is as follows:

[0017] ,

[0018] The maximum deceleration area without considering the damping term The calculation formula is as follows:

[0019] ,

[0020] in, is the active power reference, is the line reactance, is the grid voltage, is the equivalent potential amplitude, is the equivalent potential amplitude before the fault;

[0021] The inequality The formula is as follows:

[0022] .

[0023] Preferably, the inequality Using the binary search method to solve, the inequality will be satisfied The equivalent potential amplitude The critical value of is the minimum value of the grid voltage without considering the damping term. .

[0024] Preferably, the calculation considers the minimum value of the grid voltage considering the damping term , the specific method is as follows:

[0025] Calculate the acceleration area taking into account the damping term and maximum deceleration area ;

[0026] According to the acceleration area of ​​the power angle curve is less than or equal to the maximum deceleration area, an inequality is established. ;

[0027] Solving inequalities using the bisection method Get the minimum value of the grid voltage .

[0028] Preferably, the calculation takes into account the acceleration area of ​​the damping term The calculation formula is as follows:

[0029] ,

[0030] The maximum deceleration area The calculation formula is as follows:

[0031] ,

[0032] in, is the rated angular velocity, represents the damping coefficient, is the maximum value of the critical angular velocity;

[0033] The inequality The formula is as follows:

[0034] ,

[0035] Among them, the definition parameters , , .

[0036] Preferably, the inequality Using the binary search method to solve, the inequality will be satisfied The equivalent potential amplitude The critical value of is taken as the minimum value of the grid voltage considering the damping term .

[0037] Preferably, the voltage drop is divided into a stable scenario, a small interference scenario and a large interference scenario according to the comparison result, as follows:

[0038] When the equivalent potential amplitude of the system is higher than When the grid-connected inverter is in a stable scenario, no synchronous instability occurs;

[0039] When the equivalent potential amplitude of the system is greater than Less than or equal to When the interference is small, the synchronization stability can be improved by adjusting the system damping without reducing the power rating;

[0040] When the equivalent potential amplitude of the system is less than or equal to When it is a large interference scenario, it is necessary to reduce the power.

[0041] A network-building new energy synchronous stable control interference scene determination system, comprising:

[0042] An information collection module is configured to collect active power reference values, line reactance, grid connection point voltage, equivalent potential amplitude, and pre-fault equivalent potential amplitude of a grid-forming new energy power system;

[0043] Boundary value calculation module: It is configured to calculate the acceleration area and maximum deceleration area without considering the damping term and the acceleration area and maximum deceleration area with considering the damping term; according to the principle that the acceleration area of ​​the power angle curve is less than the maximum deceleration area, the minimum value of the grid voltage without considering the damping term is calculated. , Considering the damping term, the grid voltage has a minimum value ;

[0044] Scene determination module: configured to compare the system equivalent potential amplitude with , Compare and classify the voltage drop into stable scenario, small interference scenario and large interference scenario according to the comparison result.

[0045] In some embodiments, the device includes a processor and a memory storing program instructions, and the processor is configured to execute the method for determining interference scenarios of the networking-type new energy synchronous stability control when running the program instructions.

[0046] In some embodiments, the storage medium stores program instructions, and when the program instructions are run, they execute the method for determining interference scenarios of network-building new energy synchronous stability control.

[0047] The embodiments of the present disclosure provide a method, system, and device for determining interference scenarios of network-building new energy synchronous stable control, which can achieve the following technical effects:

[0048] The method for determining interference scenarios based on synchronous stable control of grid-building new energy of the present invention can determine interference scenarios by calculating equivalent potential amplitudes, comparing the minimum value of the grid voltage without considering the damping term and the minimum value of the grid voltage considering the damping term after the grid fails and becomes unstable. The method of this patent has strong scenario adaptability, especially when the grid fails in an unstable state, the interference interval of the voltage drop can be obtained by accurate calculation, and then the synchronization stability can be improved by corresponding methods, which is its advantage.

[0049] 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

[0050] 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:

[0051] Figure 1 It is a schematic flow chart of the method of the present invention;

[0052] Figure 2 It is a schematic diagram of a minimum value calculation process of a grid voltage without considering a damping term provided by an embodiment of the present disclosure;

[0053] Figure 3 It is a schematic diagram of a minimum value calculation process of a grid voltage considering a damping term provided by an embodiment of the present disclosure;

[0054] Figure 4 is a schematic diagram of interference scenario division provided by an embodiment of the present disclosure;

[0055] Figure 5 It is a schematic diagram of a network-building new energy synchronous stability control interference scenario determination device provided in an embodiment of the present disclosure. DETAILED DESCRIPTION

[0056] 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.

[0057] 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.

[0058] Combination Figure 1 A method for determining interference scenarios of network-building new energy synchronous stable control includes:

[0059] S1: Obtain active power reference value, line reactance, grid connection point voltage, equivalent potential amplitude, and equivalent potential amplitude before fault of the grid-connected new energy power system.

[0060] S2: Calculate the acceleration area and maximum deceleration area without considering the damping term, as well as the acceleration area and maximum deceleration area with considering the damping term.

[0061] S3: According to the principle that the acceleration area of ​​the power angle curve is smaller than the maximum deceleration area, the grid voltage has a minimum value when the damping term is not considered. , Considering the damping term, the grid voltage has a minimum value .

[0062] S4: The system equivalent potential amplitude and , Compare and classify the voltage drop into stable scenario, small interference scenario and large interference scenario according to the comparison result.

[0063] As a refinement of the above embodiment, the traditional equal area rule does not consider the damping term. If the acceleration area of ​​the power angle curve is smaller than the maximum deceleration area, the grid-type inverter must maintain synchronous stability. The calculation does not consider the damping term. The grid voltage has a minimum value. , the specific method is as follows:

[0064] S3011: Calculate the acceleration area without considering the damping term and maximum deceleration area .

[0065] The acceleration area without considering the damping term The calculation formula is as follows:

[0066] ,

[0067] The maximum deceleration area without considering the damping term The calculation formula is as follows:

[0068] ,

[0069] in, is the active power reference, is the line reactance, is the grid voltage, is the equivalent potential amplitude, is the equivalent potential amplitude before the fault.

[0070] S3012: When the grid-connected inverter maintains synchronous stability, the acceleration area of ​​the power angle curve is smaller than the maximum deceleration area, and the inequality is established. .

[0071] The inequality The formula is as follows:

[0072] .

[0073] S3013: Solving inequalities using the bisection method Get the minimum value of the grid voltage .

[0074] According to the inequality , the grid voltage has a minimum value, recorded as , that is, the boundary of determining the stability of the system without considering the system damping condition. This minimum value can be solved by the dichotomy method. Figure 2 As shown, we can first give the initial interval And calculation accuracy , by continuously changing the interval Divide into two, so that the two end points of the interval satisfy and do not satisfy the inequality respectively , until the distance between the two end points is less than , solve the satisfying The critical value is .

[0075] As a refinement of the above embodiment, in fact, after considering the damping control effect of the system, when When and To increase the critical angular velocity , ensuring the synchronization stability of the grid-connected inverter. It cannot be increased infinitely, and its maximum value cannot exceed the grid connection standard. and , there is a limit to improving synchronization stability. The maximum value allowed is given by the grid connection standard and is calculated as The following is the adjustment for The maximum grid voltage drop limit that can be accepted to maintain synchronous stability.

[0076] Specifically, the calculation considers the minimum value of the grid voltage considering the damping term , the specific method is as follows:

[0077] S3021: Calculation The acceleration area considering the damping term and maximum deceleration area .

[0078] The calculation takes into account the acceleration area of ​​the damping term The calculation formula is as follows:

[0079] ,

[0080] The maximum deceleration area The calculation formula is as follows:

[0081] ,

[0082] in, is the rated angular velocity, represents the damping coefficient, is the maximum value of the critical angular velocity;

[0083] S3022: Establish an inequality based on the acceleration area of ​​the power angle curve being less than or equal to the maximum deceleration area .

[0084] The inequality The formula is as follows:

[0085] ,

[0086] Among them, the definition parameters , , .

[0087] S3023: Solving inequalities using the bisection method Get the minimum value of the grid voltage ;

[0088] Obviously, the inequality is satisfied The grid voltage has a minimum value, which is recorded as , that is, the boundary of system synchronization stability is ensured by damping regulation. same, It can also be obtained by binary search. The calculation process is as follows: Figure 3 . will satisfy the inequality The equivalent potential amplitude The critical value of is taken as the minimum value of the grid voltage considering the damping term .

[0089] As a refinement of the above embodiment, Figure 4 As shown, according to the comparison results, the voltage drop is divided into stable scenario, small interference scenario and large interference scenario, as follows:

[0090] When the equivalent potential amplitude of the system is higher than In this case, for a stable scenario, the grid-connected inverter does not experience synchronous instability.

[0091] When the equivalent potential amplitude of the system is greater than Less than or equal to In the case of small disturbances, the synchronization stability can be improved by adjusting the system damping without reducing the power rating.

[0092] When the equivalent potential amplitude of the system is less than or equal to When it is a large interference scenario, it is necessary to reduce the power.

[0093] It should be noted that:

[0094] The method invented by this patent for determining interference scenarios based on synchronous stable control of grid-building renewable energy has shown significant advantages after a grid failure causes instability. This method accurately determines interference scenarios by accurately calculating the voltage drop value and comparing it with the grid voltage's instability critical value (i.e., the critical value without considering damping conditions) and the damping controllable critical value.

[0095] Specifically, the patented method first uses the equal area rule and related formulas to find the critical values ​​of the grid voltage under different conditions. These critical values ​​serve as an important basis for judging the stability of the system and can reflect the response characteristics of the system under different disturbances. Subsequently, based on the comparison results between the voltage drop value and these critical values, the interference scenarios are divided into stable scenarios, small interference scenarios, and large interference scenarios.

[0096] In stable scenarios, grid-connected inverters can maintain synchronous stability without synchronous instability. In small interference scenarios, although the system is subject to a certain degree of disturbance, the synchronous stability can be improved by adjusting the system damping without reducing the power rating. This helps avoid unnecessary power waste and improve energy efficiency. In large interference scenarios, synchronous instability cannot be effectively suppressed by adjusting the system damping alone. At this time, strategies such as power reduction operation must be adopted to ensure system stability.

[0097] This patented method has strong scene adaptability, especially when the power grid fault occurs in an unstable state, it can accurately calculate the interference range where the voltage drop is located. This provides strong support for the implementation of targeted synchronous stability control strategies and helps to improve the safe and stable operation level of new energy power systems. Therefore, this patented method has broad application prospects and important practical significance in the field of protection and control of new energy power systems.

[0098] Example 2

[0099] A network-building new energy synchronous stable control interference scene determination system, comprising:

[0100] The information collection module is configured to collect active power reference values, line reactance, grid connection point voltage, equivalent potential amplitude, and pre-fault equivalent potential amplitude of the grid-forming new energy power system.

[0101] Boundary value calculation module: It is configured to calculate the acceleration area and maximum deceleration area without considering the damping term and the acceleration area and maximum deceleration area with considering the damping term; according to the principle that the acceleration area of ​​the power angle curve is less than the maximum deceleration area, the minimum value of the grid voltage without considering the damping term is calculated. , Considering the damping term, the grid voltage has a minimum value .

[0102] Scene determination module: configured to compare the system equivalent potential amplitude with , Compare and classify the voltage drop into stable scenario, small interference scenario and large interference scenario according to the comparison result.

[0103] As a refinement of the above embodiment, the boundary value calculation module further includes:

[0104] The first boundary value calculation module is configured to calculate the acceleration area without considering the damping term. and maximum deceleration area , according to the acceleration area of ​​the power angle curve is less than the maximum deceleration area to establish the inequality According to the inequality Get the minimum value of the grid voltage .

[0105] The second boundary value calculation module is configured to calculate the acceleration area considering the damping term. and maximum deceleration area , according to the acceleration area of ​​the power angle curve is less than or equal to the maximum deceleration area to establish the inequality According to the inequality Get the minimum value of the grid voltage .

[0106] Combination Figure 5As shown, the embodiment of the present disclosure provides a network-building new energy synchronous stable control interference scenario determination device 300, including a processor (processor) 304 and a memory (memory) 301. Optionally, the device may also include a communication interface (Communication Interface) 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 network-building new energy synchronous stable control interference scenario determination method of the above embodiment.

[0107] 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.

[0108] 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 function application and data processing by running the program instructions / modules stored in the memory 301, that is, the interference scene determination method of the network-building new energy synchronous stability control in the above embodiment is realized.

[0109] 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.

[0110] 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.

[0111] 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.

[0112] 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.

[0113] 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.

[0114] 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 method for determining interference scenarios of network-building new energy synchronous stable control, characterized in that: include: Obtain active power reference value, line reactance, grid connection point voltage, equivalent potential amplitude, and equivalent potential amplitude before fault of grid-connected new energy power system; Calculate the acceleration area and maximum deceleration area without considering the damping term and the acceleration area and maximum deceleration area with considering the damping term; According to the principle that the acceleration area of ​​the power angle curve is less than the maximum deceleration area, the grid voltage has a minimum value when the damping term is not considered. , Considering the damping term, the grid voltage has a minimum value ; The system equivalent potential amplitude and , Compare and classify the voltage drop into stable scenario, small interference scenario and large interference scenario according to the comparison result.

2. The method for determining interference scenarios of network-building new energy synchronous stability control according to claim 1 is characterized in that: The calculation does not consider the damping term. The grid voltage has a minimum value. , the specific method is as follows: Calculate the acceleration area without considering the damping term and maximum deceleration area ; According to the power angle curve, the acceleration area is less than the maximum deceleration area, and the inequality is established. ; Solving inequalities using the bisection method Get the minimum value of the grid voltage .

3. The method for determining interference scenarios of network-building new energy synchronous stability control according to claim 2 is characterized in that: The acceleration area without considering the damping term The calculation formula is as follows: ， The maximum deceleration area without considering the damping term The calculation formula is as follows: ， in, is the active power reference, is the line reactance, is the grid voltage, is the equivalent potential amplitude, is the equivalent potential amplitude before the fault; The inequality The formula is as follows: 。 4. The method for determining interference scenarios of network-building new energy synchronous stability control according to claim 3 is characterized in that: The inequality Using the binary search method to solve, the inequality will be satisfied The equivalent potential amplitude The critical value of is the minimum value of the grid voltage without considering the damping term. .

5. The method for determining interference scenarios of network-building new energy synchronous stability control according to claim 1 is characterized in that: Calculation Considering the Damping Term, the Grid Voltage Has a Minimum Value , the specific method is as follows: Calculate the acceleration area taking into account the damping term and maximum deceleration area ; According to the acceleration area of ​​the power angle curve is less than or equal to the maximum deceleration area, an inequality is established. ; Solving inequalities using the bisection method Get the minimum value of the grid voltage .

6. The method for determining interference scenarios of network-building new energy synchronous stability control according to claim 5 is characterized in that: The calculation takes into account the acceleration area of ​​the damping term The calculation formula is as follows: ， The maximum deceleration area The calculation formula is as follows: ， in, is the active power reference, is the line reactance, is the grid voltage, is the equivalent potential amplitude, is the equivalent potential amplitude before the fault, is the rated angular velocity, represents the damping coefficient, is the maximum value of the critical angular velocity; The inequality The formula is as follows: ， Among them, the definition parameters , , .

7. The method for determining interference scenarios of network-building new energy synchronous stability control according to claim 6 is characterized in that: The inequality Using the binary search method to solve, the inequality will be satisfied The equivalent potential amplitude The critical value of is taken as the minimum value of the grid voltage considering the damping term .

8. The method for determining interference scenarios of network-building new energy synchronous stability control according to any one of claims 1 to 7, characterized in that: According to the comparison results, the voltage drop is divided into stable scenario, small interference scenario and large interference scenario, as follows: When the equivalent potential amplitude of the system is higher than When the grid-connected inverter is in a stable scenario, no synchronous instability occurs; When the equivalent potential amplitude of the system is greater than Less than or equal to When the interference is small, the synchronization stability can be improved by adjusting the system damping without reducing the power rating; When the equivalent potential amplitude of the system is less than or equal to When it is a large interference scenario, it is necessary to reduce the power.

9. A network-building new energy synchronous stability control interference scenario determination system for executing any of the methods described in claims 1-8, characterized in that: include: An information collection module is configured to collect active power reference values, line reactance, grid connection point voltage, equivalent potential amplitude, and pre-fault equivalent potential amplitude of a grid-forming new energy power system; Boundary value calculation module: It is configured to calculate the acceleration area and maximum deceleration area without considering the damping term and the acceleration area and maximum deceleration area with considering the damping term; according to the principle that the acceleration area of ​​the power angle curve is less than the maximum deceleration area, the minimum value of the grid voltage without considering the damping term is calculated. , Considering the damping term, the grid voltage has a minimum value ; Scene determination module: configured to compare the system equivalent potential amplitude with , Compare and classify the voltage drop into stable scenario, small interference scenario and large interference scenario according to the comparison result.

10. A network-building new energy synchronous stability control interference scene determination device, comprising a processor and a memory storing program instructions, characterized in that: The processor is configured to execute the method for determining interference scenarios of networked new energy synchronous stability control as described in any one of claims 1 to 8 when running the program instructions.

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