Network control transformation method, system, equipment and medium

Abstract

The present invention belongs to the technical field of new power systems, and specifically relates to a grid-type control transformation method, system, equipment and medium. In view of the deficiencies in the calculation of the transformation capacity by the existing grid-type control transformation method, the present invention adopts the following technical scheme: the grid-type control transformation method for realizing subsynchronous oscillation suppression includes: obtaining the critical short-circuit ratio of the following grid type and the critical short-circuit ratio of the grid type; calculating the initial generalized short-circuit ratio; calculating the influence factor of the initial generalized short-circuit ratio on the rated capacity of each converter and sorting it; selecting the station with the largest influence factor for equal-capacity grid-type transformation, calculating the generalized short-circuit ratio after the system transformation and deciding whether to add the transformation station; after determining the transformation position, the maximum eigenvalue of the extended admittance matrix is ​​less than the critical short-circuit ratio of the grid type as a constraint, and solving to obtain the minimum transformation capacity. The beneficial effects of the present invention are: based on the influence factors and each short-circuit ratio, the minimum transformation capacity is obtained, and the economic cost is minimized.

Description

Technical Field

[0001] The present invention belongs to the technical field of new power systems with a high proportion of renewable energy, and specifically relates to a grid-type control transformation method, system, equipment and medium. Background Art

[0002] With the extensive use of renewable energy, the power grid structure based on traditional generators such as thermal power, hydropower, and nuclear power has encountered impacts. The main reason for the challenge is that the traditional power system is mainly based on synchronous generators such as thermal power, hydropower, and nuclear power. When a certain fault occurs in the power grid, the entire set of units can provide inertial support for the power grid. However, as more and more renewable energy electricity manufactured by semiconductor technology is incorporated into the power grid, the inertial support capacity of these renewable energy power generation equipment is weak, which will lead to a lack of inertia in the power grid system. At the same time, as the capacity of renewable energy equipment gradually increases, the corresponding power grid short-circuit capacity ratio coefficient value decreases (short-circuit capacity ratio-short circuit ratio, that is, the ratio of the total capacity of the power grid fed into the renewable energy equipment to the capacity of the renewable energy equipment to be fed in; when the short-circuit capacity ratio is large, it means that the renewable energy equipment is connected to a strong power system, indicating that the switching of the equipment does not have a great impact on the system, and the power system strength is high; otherwise, it indicates that the power grid system is fragile), which gradually reduces the stability of the power grid, and it is very easy to cause oscillation problems such as inability to connect to the grid or frequent disconnection.

[0003] Existing studies have shown that in a system with multiple renewable energy stations connected to the grid, grid forming (GFM) equipment can suppress subsynchronous oscillations caused by grid following (GFL) equipment connected to the grid under weak power grids. At present, a number of renewable energy grid forming transformation projects have been carried out at home and abroad to reduce the risk of subsynchronous oscillations and improve system stability. There are two main ways of transformation: one is to transform the grid following equipment into grid forming equipment, and the other is to increase the capacity of existing grid forming equipment.

[0004] Regardless of the method, grid-type control transformation involves costs, among which the transformation capacity is the most important factor affecting the cost. However, there are few existing literatures on the calculation of transformation capacity. A few related literatures also have one or more of the following deficiencies: 1. The transformation location is not considered; 2. The subsynchronous oscillation constraints and low-frequency oscillation constraints are not comprehensively considered; 3. The amount of calculation is large.

[0005] Therefore, how to clearly define the location of the grid-type control transformation and obtain the capacity required for the transformation through quantitative evaluation to ensure that the economic investment is minimized while improving system stability is of positive significance for guiding the practice of grid-type control transformation. Summary of the invention

[0006] The present invention aims at the deficiencies in the calculation of transformation capacity in the existing network-type control transformation method, and provides a network-type control transformation method. Based on the generalized short-circuit ratio index of the multi-new energy station access system, the network-type control transformation of the new energy equipment on the transmission side is carried out from the perspective of suppressing subsynchronous oscillation, and the minimum guaranteed capacity required for the network-type control transformation is quantitatively evaluated, so as to minimize the economic cost in the transformation process. The present invention also provides a network-type control transformation system, a computer device and a computer-readable storage medium.

[0007] To achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a network-based control transformation method for realizing subsynchronous oscillation suppression is applied to a multi-new energy station access system, and the network-based control transformation method for realizing subsynchronous oscillation suppression includes:

[0008] Step S1, obtaining the grid-following critical short-circuit ratio of the grid-following converter that undergoes subsynchronous oscillation under a weak grid Critical short-circuit ratio of grid-connected converters with subsynchronous oscillation under strong grid conditions ; Calculate the initial generalized short-circuit ratio gSCR of the system; when gSCR is less than Subsequent transformation is carried out when necessary;

[0009] Step S2, calculating and ranking the influence factors of the initial generalized short-circuit ratio gSCR on the rated capacity of each new energy station converter, wherein the influence factor represents the influence degree of each converter in the new energy station on the generalized short-circuit ratio;

[0010] Step S3: Select the station with the largest influencing factor to carry out equal capacity network transformation, and calculate the generalized short circuit ratio after the system transformation. ;

[0011] Step S4: Determination Is it less than , and decide whether to increase the number of new energy stations for network transformation according to whether the judgment results meet the requirements. Not less than , thereby determining the transformation location;

[0012] Step S5: After determining the transformation position, the maximum eigenvalue of the extended admittance matrix corresponding to the grid-type converter is less than the critical short-circuit ratio of the grid-type converter. As a constraint, the total minimum transformation capacity of the system's new energy network control and the transformation capacity of each station under the minimum transformation capacity are solved.

[0013] The grid-type control transformation method for realizing subsynchronous oscillation suppression of the present invention compares the initial generalized short-circuit ratio and the grid-type critical short-circuit ratio from the perspective of suppressing subsynchronous oscillations; based on the generalized short-circuit ratio index of the multi-new energy station access system, the impact factor of the transformation of each station is calculated, and the stations with large impact factors are transformed first, and the number of stations that need to be transformed is small and / or the capacity is small; based on the generalized short-circuit ratio after transformation and the grid-type critical short-circuit ratio, the minimum capacity required for the grid-type control transformation is quantitatively evaluated to minimize the economic cost during the transformation process.

[0014] As an improvement, in step S1, the critical short circuit ratio of the network type and network-type critical short-circuit ratio Obtained according to the parameters of the converter;

[0015] In step S1, the rated capacity diagonal matrix of the converter is obtained according to the parameters of each converter in the system: , and invert it to get the inverse matrix , the equivalent admittance matrix is ​​obtained by the Thevenin equivalent of the receiving AC power grid of the system , the inverse matrix and the equivalent admittance matrix Multiply to get the extended admittance matrix , and then the initial generalized short-circuit ratio gSCR of the system is obtained;

[0016] Rated capacity diagonal matrix It is expressed as:

[0017]

[0018] In the formula, diag represents a diagonal matrix, to Respectively represent the rated capacity of each converter;

[0019] The initial generalized short-circuit ratio gSCR is expressed as:

[0020] .

[0021] As an improvement, in step S2, the following formula is used to calculate the influence factor of the initial generalized short-circuit ratio gSCR on the rated capacity of each new energy station: :

[0022]

[0023] In the formula, Pi Representative i The influencing factor of the generalized short-circuit ratio gSCR corresponding to the rated capacity of each node new energy station is: Si Indicates i The rated capacity of each node of the new energy station, and They are i Extended admittance matrix of a node new energy station The left and right eigenvectors of ;

[0024] In step S2, the network type transformation is performed according to the rated capacity.

[0025] As an improvement, in step S3, the modified generalized short-circuit ratio gSCR is changed to the minimum eigenvalue of the extended admittance matrix The calculation formula is expressed as:

[0026]

[0027] In the formula, diag represents a diagonal matrix, M Drawing on the experience of mathematical programming M matrix, M Replace the rated capacity of the node with the maximum participation factor.

[0028] As an improvement, step S4 includes:

[0029] Step S41: Compare the generalized short-circuit ratio after transformation Compared with the critical short circuit of the grid type ;

[0030] Step S42: If ≥ , then determine the transformation location; if < , then continue to carry out network control transformation on the station where the second largest influencing factor is located, and recalculate , also used in calculations M Replace the rated capacity of the node with the second largest participating factor,

[0031] Step S43: Perform network control transformation according to the order of influencing factors until ≥ , then determine the transformation location.

[0032] As an improvement, in step S5, the calculation formula for the minimum transformation capacity of the system's new energy grid configuration control is:

[0033]

[0034] In the formula, is the independent variable, n The number of stations that need to be renovated;

[0035] According to the solution formula, the total minimum transformation capacity and the transformation capacity of each station under the minimum transformation capacity are obtained;

[0036] If the transformation capacity of each station is less than the transformed capacity, the transformation plan will be directly output;

[0037] If the renovated capacity of each station is greater than the already renovated capacity, then the difference capacity will be added to the corresponding station to meet the minimum configuration capacity requirements.

[0038] In step S5, the sdpt3 solver in the YALMIP toolbox is used to solve the problem.

[0039] A networked control transformation system for realizing subsynchronous oscillation suppression is used to realize the aforementioned networked control transformation method for realizing subsynchronous oscillation suppression, comprising:

[0040] The acquisition module is used to obtain the critical short-circuit ratio of the grid-following converter that has subsynchronous oscillation under weak grid conditions. , grid-type critical short-circuit ratio of subsynchronous oscillation of grid-type converter under strong power grid and the equivalent admittance matrix ;

[0041] Generalized short circuit ratio calculation module, used to calculate the system's initial generalized short circuit ratio gSCR and the modified generalized short circuit ratio ;

[0042] Judgment module, used to judge gSCR and Is it less than ;

[0043] The impact factor calculation module is used to calculate and sort the impact factors of the initial generalized short-circuit ratio gSCR on the rated capacity of each new energy station converter, where the impact factor represents the degree of influence of each converter in the new energy station on the generalized short-circuit ratio;

[0044] Modify the location determination module to Is it less than The judgment result determines whether to add new energy stations for network-type transformation and finally determines the transformation location;

[0045] The minimum transformation capacity calculation module is used to calculate the maximum eigenvalue of the extended admittance matrix corresponding to the grid-type converter that is less than the critical short-circuit ratio of the grid-type converter. As a constraint, the total minimum transformation capacity of the system's new energy network control and the transformation capacity of each station under the minimum transformation capacity are solved.

[0046] The computer device includes a processor and a storage medium, wherein the storage medium stores a computer program, and when the computer program is executed by the processor, the aforementioned networked control transformation method for realizing subsynchronous oscillation suppression is implemented.

[0047] A computer-readable storage medium stores a computer program thereon, and when the computer program is executed, the aforementioned networked control reconstruction method for achieving subsynchronous oscillation suppression is implemented. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] Figure 1 It is a flow chart of the network control transformation method of an embodiment of the present invention.

[0049] Figure 2 It is an equivalent circuit diagram of a full grid-type converter feeding system before transformation according to the grid-type control transformation method of an embodiment of the present invention. DETAILED DESCRIPTION

[0050] The technical solutions of the embodiments of the present invention are explained and described below, but the following embodiments are only preferred embodiments of the present invention, not all. Based on the embodiments in the implementation mode, other embodiments obtained by those skilled in the art without creative work are all within the protection scope of the present invention.

[0051] See also Figure 1 , a network-based control transformation method for realizing subsynchronous oscillation suppression is applied to a multi-new energy station access system, and the network-based control transformation method for realizing subsynchronous oscillation suppression includes:

[0052] Step S1, obtaining the grid-following critical short-circuit ratio of the grid-following converter that undergoes subsynchronous oscillation under a weak grid Critical short-circuit ratio of grid-connected converters with subsynchronous oscillation under strong grid conditions ; Calculate the initial generalized short-circuit ratio gSCR of the system; when gSCR is less than Subsequent transformation is carried out when necessary;

[0053] Step S2, calculating and ranking the influence factors of the initial generalized short-circuit ratio gSCR on the rated capacity of each new energy station converter, wherein the influence factor represents the influence degree of each converter in the new energy station on the generalized short-circuit ratio;

[0054] Step S3: Select the station with the largest influencing factor to carry out equal capacity network transformation, and calculate the generalized short circuit ratio after the system transformation. ;

[0055] Step S4: Determination Is it less than , and decide whether to increase the number of new energy stations for network transformation according to whether the judgment results meet the requirements. Not less than , thereby determining the transformation location;

[0056] Step S5: After determining the transformation position, the maximum eigenvalue of the extended admittance matrix corresponding to the grid-type converter is less than the critical short-circuit ratio of the grid-type converter. As a constraint, the total minimum transformation capacity of the system's new energy network control and the transformation capacity of each station under the minimum transformation capacity are solved.

[0057] In this embodiment, the new energy station is a collection of all equipment below the wind farm grid connection point that is centrally connected to the power system, including transformers, busbars, lines, converters, energy storage, wind turbines, photovoltaic power generation equipment, reactive power regulation equipment and auxiliary equipment.

[0058] In this embodiment, in step S1, firstly, the required relevant information is input, including the obtained critical short circuit ratio of the grid type. and network-type critical short-circuit ratio etc., compared with the critical short circuit of network type and network-type critical short-circuit ratio It is obtained based on the parameters of the converter and is determined when the converter leaves the factory.

[0059] In this embodiment, in step S1, the rated capacity diagonal matrix of the converter is obtained according to the parameters of each converter in the system. , and invert it to get the inverse matrix , the equivalent admittance matrix is ​​obtained by the Thevenin equivalent of the receiving AC power grid of the system , the inverse matrix and the equivalent admittance matrix Multiply to get the extended admittance matrix , and then the initial generalized short-circuit ratio gSCR of the system is obtained.

[0060] Rated capacity diagonal matrix It is expressed as:

[0061]

[0062] In the formula, diag represents a diagonal matrix, to Respectively represent the rated capacity of each converter;

[0063] The initial generalized short-circuit ratio gSCR is expressed as:

[0064] .

[0065] In this embodiment, the initial generalized short circuit ratio gSCR of the full grid-type converter feeding into the system is usually smaller than the grid-type critical short circuit ratio, so modification is required. When the initial generalized short circuit ratio gSCR is not smaller than the grid-type critical short circuit ratio, no modification is required.

[0066] In this embodiment, in step S2, the following formula is used to calculate the influence factor of the initial generalized short-circuit ratio gSCR on the rated capacity of each new energy station: :

[0067]

[0068] In the formula, Representative i The influencing factor of the generalized short-circuit ratio gSCR corresponding to the rated capacity of each node new energy station is: Indicates i The rated capacity of each node of the new energy station, and They are i Extended admittance matrix of a node new energy station The left and right eigenvectors of .

[0069] In this embodiment, in step S3 and subsequent steps, no actual transformation is performed, and step S5 outputs the final transformation plan. That is, the minimum eigenvalue of the extended admittance matrix The calculation formula is expressed as:

[0070]

[0071] In the formula, diag represents a diagonal matrix, M Drawing on the experience of mathematical programming M matrix, M Replace the rated capacity of the node with the maximum participation factor.

[0072] In this embodiment, step S4 includes:

[0073] Step S41: Compare the generalized short-circuit ratio after transformation Compared with the critical short circuit of the grid type ;

[0074] Step S42: If ≥ , then determine the transformation location; if < , then continue to carry out network control transformation on the station where the second largest influencing factor is located, and recalculate , also used in calculations M Replace the rated capacity of the node with the second largest participating factor,

[0075] Step S43: Perform network control transformation according to the order of influencing factors until ≥ , then determine the transformation location.

[0076] In this embodiment, the solution formula for the minimum transformation capacity of the grid-type control is:

[0077]

[0078] In the formula, is the independent variable, n The number of stations that need to be renovated;

[0079] According to the solution formula, the total minimum transformation capacity and the transformation capacity of each station under the minimum transformation capacity are obtained. ;

[0080] If the transformation capacity of each station is less than the transformed capacity, the transformation plan will be directly output;

[0081] If the renovated capacity of each station is greater than the already renovated capacity, then the difference capacity will be added to the corresponding station to meet the minimum configuration capacity requirements.

[0082] In step S5, the semidefinite programming problem is solved using the sdpt3 solver in the YALMIP toolbox.

[0083] Build a 4-grid converter feeding system in Matlab / Simulink software, such as Figure 2 Assume that the capacity of the four grid-following converters is 2pu. =1.75, network type critical short circuit ratio = 10. Initial rated capacity diagonal matrix . Equivalued admittance matrix It is expressed as:

[0084]

[0085] According to the formula

[0086]

[0087] The initial generalized short-circuit ratio gSCR of the calculated system is 1.4481, which is less than Therefore, a transformation is needed.

[0088] According to the formula

[0089]

[0090] Calculate the impact factor of the initial generalized short-circuit ratio gSCR on the rated capacity of each new energy station, and get the impact factors of each node are =0.5658, =0.9649, =0.4390, =0.0303. The impact factor of node 2 is the largest, so node 2 is transformed first (the node corresponds to the station).

[0091] Assume that only the site where Node 2 is located is renovated and the capacity of Node 2 is changed to M , according to the formula

[0092]

[0093] Calculate the rated capacity diagonal matrix after the equal capacity network transformation of node 2, and use the formula

[0094]

[0095] Calculate the generalized short-circuit ratio after the equal-capacity network transformation is performed on the station where node 2 is located (Too ),get is 4.4289, which is greater than 1.75, so only the site where node 2 is located needs to be modified to meet the requirement.

[0096] The solver is used to solve the formula

[0097]

[0098] Solve (since only one is modified, n= 1 only counts one ), get the transformation capacity of node 2 under the minimum transformation capacity (The subscript 1 indicates the first station that needs to be transformed, not the station number 1) is 0.4808pu, which is less than the transformed capacity (rated capacity) of 2pu. The output transformation plan is to transform node 2 with equal capacity, and the process ends.

[0099] for Figure 2 The 4 grid-type converters shown are fed into the system. At other times, other situations may occur: 1. The initial generalized short-circuit ratio gSCR of the system is greater than the critical short-circuit ratio of the grid-type converter. , then no transformation is needed; 2. After the transformation of the station with the largest influencing factor, the generalized short-circuit ratio after the transformation Still less than the critical short circuit ratio of the network type , then it is necessary to transform the station (or more stations) where the second largest influencing factor is located, and calculate the generalized short-circuit ratio after the transformation of the stations (or more stations) where the first and second largest influencing factors are located. , until the generalized short-circuit ratio after transformation Not less than the critical short circuit ratio of the network type ; 3. After determining the transformation location, the transformation capacity of each station under the calculated minimum transformation capacity (the sum of the capacity of all stations that need to be transformed into a network) may be greater than the transformed capacity (rated capacity) of the corresponding station. In this case, the corresponding station will be transformed with additional capacity (greater than the rated capacity). For example, the generalized short-circuit ratio after transformation is calculated. In the end, stations 1 and 2 need to be renovated to meet the requirements. After the solver is used, the minimum renovation capacity of stations 1 and 2 is 2.5pu and 2.8pu respectively. The final output is a renovation plan for increasing the capacity of stations 1 and 2.

[0100] The embodiment of the present invention also provides a networked control transformation system for realizing subsynchronous oscillation suppression, which is used to realize the aforementioned networked control transformation method for realizing subsynchronous oscillation suppression, including:

[0101] The acquisition module is used to obtain the critical short-circuit ratio of the grid-following converter that has subsynchronous oscillation under weak grid conditions. , grid-type critical short-circuit ratio of subsynchronous oscillation of grid-type converter under strong power grid and the equivalent admittance matrix ;

[0102] Generalized short circuit ratio calculation module, used to calculate the system's initial generalized short circuit ratio gSCR and the modified generalized short circuit ratio ;

[0103] Judgment module, used to judge gSCR and Is it less than ;

[0104] The impact factor calculation module is used to calculate and sort the impact factors of the initial generalized short-circuit ratio gSCR on the rated capacity of each new energy station converter, where the impact factor represents the degree of influence of each converter in the new energy station on the generalized short-circuit ratio;

[0105] Modify the location determination module to Is it less than The judgment result determines whether to add new energy stations for network-type transformation and finally determines the transformation location;

[0106] The minimum transformation capacity calculation module is used to calculate the maximum eigenvalue of the extended admittance matrix corresponding to the grid-type converter that is less than the critical short-circuit ratio of the grid-type converter. As a constraint, the total minimum transformation capacity of the system's new energy network control and the transformation capacity of each station under the minimum transformation capacity are solved.

[0107] An embodiment of the present invention also provides a computer device, including a processor and a storage medium, wherein the storage medium stores a computer program, and when the computer program is executed by the processor, the aforementioned networked control transformation method for achieving subsynchronous oscillation suppression is implemented.

[0108] The embodiment of the present invention also provides a computer-readable storage medium on which a computer program is stored. When the computer program is executed, the aforementioned network-based control reconstruction method for achieving subsynchronous oscillation suppression is implemented.

[0109] The above is only a specific implementation of the invention, but the protection scope of the invention is not limited thereto. Those skilled in the art should understand that the invention includes but is not limited to the contents described in the above specific implementation. Any modification that does not deviate from the functional and structural principles of the invention will be included in the scope of the claims.

Claims

1. A network-based control transformation method for realizing subsynchronous oscillation suppression is used for the network-based control transformation of a full-grid-based new energy station access system, which is characterized by: The networked control transformation method for achieving subsynchronous oscillation suppression includes: Step S1, obtaining the grid-following critical short-circuit ratio of the grid-following converter that undergoes subsynchronous oscillation under a weak grid Critical short-circuit ratio of grid-connected converters with subsynchronous oscillation under strong grid conditions ; Calculate the initial generalized short-circuit ratio gSCR of the system; when gSCR is less than Subsequent transformation is carried out when necessary; Step S2, calculating and ranking the influence factors of the initial generalized short-circuit ratio gSCR on the rated capacity of each new energy station converter, wherein the influence factor represents the influence degree of each converter in the new energy station on the generalized short-circuit ratio; Step S3: Select the station with the largest influencing factor to perform equal capacity network transformation, and calculate the generalized short-circuit ratio of the system after transformation. ; Step S4: Determination Is it less than , and decide whether to increase the number of new energy stations for network transformation according to whether the judgment results meet the requirements. Not less than , thereby determining the transformation location; Step S5: After determining the transformation position, the maximum eigenvalue of the extended admittance matrix corresponding to the grid-type converter is less than the critical short-circuit ratio of the grid-type converter. As a constraint, the minimum transformation capacity of the system's new energy grid control and the transformation capacity of each station under the minimum transformation capacity are solved; In step S1, the rated capacity diagonal matrix of the converter is obtained according to the parameters of each converter in the system: , and invert it to get the inverse matrix , the equivalent admittance matrix is ​​obtained by the Thevenin equivalent of the receiving AC power grid of the system , the inverse matrix and the equivalent admittance matrix Multiply to get the extended admittance matrix , and then the initial generalized short-circuit ratio gSCR of the system is obtained; In step S2, the influence factor of the initial generalized short-circuit ratio gSCR on the rated capacity of each new energy station is calculated using the following formula: : In the formula, Representative i The influencing factor of the initial generalized short-circuit ratio gSCR corresponding to the rated capacity of each node new energy station, represents the initial generalized short-circuit ratio, Indicates i The rated capacity of each node of the new energy station, and They are i Extended admittance matrix of a node new energy station The left and right eigenvectors of ; In step S3, the generalized short-circuit ratio after transformation is That is, the minimum eigenvalue of the extended admittance matrix The calculation formula is expressed as: In the formula, diag represents a diagonal matrix, M Drawing on the large M matrix in mathematical programming, M Replace the rated capacity of the node with the maximum participation factor; In step S5, the solution formula for the minimum transformation capacity of the network control is: In the formula, is the independent variable, n The number of stations that need to be renovated; According to the solution formula, the total minimum transformation capacity and the transformation capacity of each station under the minimum transformation capacity are obtained; If the transformation capacity of each station is less than the transformed capacity, the transformation plan will be directly output; If the renovated capacity of each station is greater than the already renovated capacity, then the difference capacity will be added to the corresponding station to meet the minimum configuration capacity requirements.

2. The method for implementing subsynchronous oscillation suppression by network control according to claim 1 is characterized in that: In step S1, the critical short circuit ratio of the network type and network-type critical short-circuit ratio Obtained according to the parameters of the converter; In step S1, the rated capacity diagonal matrix It is expressed as: In the formula, diag represents a diagonal matrix, to Respectively represent the rated capacity of each converter; The initial generalized short-circuit ratio gSCR is expressed as: 。 3. The method for implementing subsynchronous oscillation suppression by network control according to claim 1, characterized in that: Step S4 includes: Step S41: Compare the generalized short-circuit ratio after transformation Compared with the critical short circuit of the grid type ; Step S42: If ≥ , then determine the transformation location; if < , then continue to carry out network control transformation on the station where the second largest influencing factor is located, and recalculate , also used in calculations M Replace the rated capacity of the node with the second largest participating factor, Step S43: Perform network control transformation according to the order of influencing factors until ≥ , then determine the transformation location.

4. The method for implementing subsynchronous oscillation suppression by network-based control according to claim 1, characterized in that: In step S5, the sdpt3 solver in the YALMIP toolbox is used to solve the problem.

5. A networked control transformation system for realizing subsynchronous oscillation suppression, used to realize the networked control transformation method for realizing subsynchronous oscillation suppression as claimed in any one of claims 1 to 4, characterized in that: include: The acquisition module is used to obtain the critical short-circuit ratio of the grid-following converter that has subsynchronous oscillation under weak grid conditions. , grid-type critical short-circuit ratio of subsynchronous oscillation of grid-type converter under strong power grid and the equivalent admittance matrix ; Generalized short circuit ratio calculation module, used to calculate the system's initial generalized short circuit ratio gSCR and the modified generalized short circuit ratio ; Judgment module, used to judge gSCR and Is it less than ; The impact factor calculation module is used to calculate and sort the impact factors of the initial generalized short-circuit ratio gSCR on the rated capacity of each new energy station converter, where the impact factor represents the degree of influence of each converter in the new energy station on the generalized short-circuit ratio; Modify the location determination module to Is it less than The judgment result determines whether to add new energy stations for network-type transformation and finally determines the transformation location; The minimum transformation capacity calculation module is used to calculate the maximum eigenvalue of the extended admittance matrix corresponding to the grid-type converter that is less than the critical short-circuit ratio of the grid-type converter. As a constraint, the total minimum transformation capacity of the system's new energy network control and the transformation capacity of each station under the minimum transformation capacity are solved.

6. A computer device comprising a processor and a storage medium, wherein the storage medium stores a computer program, characterized in that: When the computer program is executed by a processor, a networked control reconstruction method for realizing subsynchronous oscillation suppression as described in any one of claims 1 to 4 is implemented.

7. A computer-readable storage medium, characterized in that: A computer program is stored thereon, and when the computer program is executed, a grid-type control reconstruction method for realizing subsynchronous oscillation suppression as claimed in any one of claims 1 to 4 is implemented.

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