Network construction type SVG configuration method and system for improving regional new energy multi-station short-circuit ratio

Abstract

The invention discloses a network construction type SVG configuration method for improving a regional new energy multi-station short-circuit ratio. The method comprises the following steps: S1, acquiring data information of a target power system; s2, constructing a first short-circuit ratio data set; s3, screening the new energy station with the lowest grid-connected point short-circuit ratio, and calculating the number of the network construction type SVGs needing to be additionally installed; s4, repeating the steps S2-S3 until a set requirement is met, and obtaining a candidate scheme; s5, additionally configuring a network construction type SVG on the low-voltage side of the transformer substation, and constructing a second short-circuit ratio data set; s6, repeating the steps S2-S4 to obtain a new candidate scheme; s7, repeating the steps S5-S6 to obtain a new candidate scheme until a set requirement is met; and S8, in all the obtained candidate schemes, selecting a final configuration scheme of the network construction type SVG. The invention further discloses a system for realizing the network construction type SVG configuration method for improving the regional new energy multi-station short circuit ratio. According to the method, the configuration of the network-forming SVG is completed on the premise of improving the short-circuit ratio of the regional new energy multi-station, the reliability is higher, the accuracy is better, and the efficiency is higher.

Description

Technical Field

[0001] This invention belongs to the field of electrical automation, and specifically relates to a method and system for configuring grid-type SVG to improve the short-circuit ratio of multiple new energy power stations in a region. Background Technology

[0002] With economic and technological development and the improvement of people's living standards, electricity has become an indispensable secondary energy source in people's production and daily life, bringing endless convenience. Therefore, ensuring a stable and reliable supply of electricity has become one of the most important tasks of the power system.

[0003] Currently, an increasing number of new energy power generation systems are being integrated into the power grid. This high proportion of new energy grid connection is squeezing the power generation space of traditional thermal and hydropower synchronous units, leading to a rapid decline in system short-circuit capacity and exacerbating the problem of insufficient reactive power support capacity at new energy power plants. To characterize the strength of the power system after new energy integration, the power system safety and stability calculation standard explicitly proposes the concept of Multiple Renewable Energy Station Short Circuit Ratio (MRSCR), requiring that the low-voltage side short-circuit ratio of new energy step-up substations should be no less than 1.5, and the short-circuit ratio at the grid connection point should be no less than 2.0. If these requirements are not met, corresponding measures must be taken to improve system strength.

[0004] A grid-type SVG is a power electronic converter that adopts a grid-type control strategy. By simulating the output characteristics of a synchronous generator, it achieves a similar effect to a synchronous condenser. During faults, it exhibits voltage source characteristics and provides short-circuit current support. It effectively solves the problem of system strength and inertia deficiency in highly electronic power grids and provides a new solution to the problem of low short-circuit ratio of new energy sources.

[0005] Currently, as a new type of equipment, the configuration scheme for grid-type SVG in power systems is relatively simple, relying on empirical methods: based on power system operation and maintenance experience, the access points and number of grid-type SVGs are set, and the results are verified through power system simulation. However, this empirical approach is not only time-consuming and labor-intensive, but also suffers from poor reliability and accuracy. Summary of the Invention

[0006] One of the objectives of this invention is to provide a highly reliable, accurate, and efficient method for configuring a grid-type SVG to improve the short-circuit ratio of multiple new energy power stations in a region.

[0007] The second objective of this invention is to provide a system for implementing the aforementioned method of configuring a grid-type SVG to improve the short-circuit ratio of multiple new energy power stations in a region.

[0008] The present invention provides a grid-type SVG configuration method for improving the short-circuit ratio of multiple renewable energy power stations in a region, comprising the following steps:

[0009] S1. Obtain data information about the target power system;

[0010] S2. Based on the current data, calculate the short-circuit ratio of the grid connection points of new energy power plants connected to the same substation, so as to construct the first short-circuit ratio data set;

[0011] S3. If there are nodes in the first short-circuit ratio data set constructed in step S2 that do not meet the set short-circuit ratio requirements for multi-machine grid-connected nodes, then select the new energy power station with the lowest grid-connected short-circuit ratio and calculate the minimum number of grid-type SVG units that need to be installed at the new energy power station.

[0012] S4. Repeat steps S2 to S3 until all nodes in the first short-circuit ratio data set constructed in step S2 meet the set short-circuit ratio requirements for multi-machine grid-connected nodes. Record the installation location and number of SVGs in the corresponding network configuration to obtain candidate solutions.

[0013] S5. Add a grid-connected SVG to the low-voltage side of the substation of the target power system, and calculate the short-circuit ratio of the grid connection point of the new energy power plants connected to the same substation to construct a second short-circuit ratio data set;

[0014] S6. If there are nodes in the second short-circuit ratio data set constructed in step S5 that do not meet the set short-circuit ratio requirements for multi-machine grid-connected nodes, then repeat steps S2 to S4 to obtain new candidate schemes.

[0015] S7. Repeat steps S5 to S6 and obtain corresponding new candidate schemes until all nodes in the second short-circuit ratio data set constructed in step S5 meet the set short-circuit ratio requirements for multi-machine grid-connected nodes.

[0016] S8. Among all the candidate schemes obtained, select the final configuration scheme of the grid-type SVG and complete the configuration of the grid-type SVG of the target power system.

[0017] The calculation of the short-circuit ratio of the grid connection point of the new energy power plants connected to the same substation, as described in steps S2 and S5, specifically includes the following steps:

[0018] The short-circuit ratio at the grid connection point of the new energy power station is calculated using the following formula:

[0019] In the formula The short-circuit ratio of the grid connection point i of the new energy power station; The short-circuit capacity of the new energy power station's grid connection point i; Let be the power of the k-th new energy power station at grid connection point i; Let i be the mutual impedance of the k-th renewable energy power station at renewable energy grid connection node i; Let i be the self-impedance of the k-th renewable energy power station at renewable energy grid connection node i; The active power injected into the j-th renewable energy power station at renewable energy grid connection node i.

[0020] Step S3 involves calculating the minimum number of grid-type SVG units required to be installed at the new energy power station, specifically including the following steps:

[0021] The requirement for the short-circuit ratio of the grid connection point of the new energy power station is set as follows: ;

[0022] The minimum number of grid-type SVG units required to be installed at this new energy power station can be calculated using the following formula. :

[0023] In the formula The minimum number of grid-type SVG units that need to be installed at this new energy power station; The short-circuit current injected into the system's side grid connection point i; The short-circuit current injected into the j-th renewable energy power station; n is the total number of renewable energy power stations; This represents the short-term maximum overload capacity of a single network-type SVG. Design capacity for a single network-type SVG; The design voltage level for a single grid-connected SVG; the transformer turns ratio for a single grid-connected SVG is... ; This is a rounding up operation.

[0024] Step S8, which involves selecting the final configuration scheme for the network-type SVG from all the candidate schemes obtained, specifically includes the following steps:

[0025] Among all the candidate schemes obtained, the scheme with the fewest number of network SVG units installed is selected as the final network SVG configuration scheme.

[0026] If there are several candidate schemes with the same number of grid-type SVG units installed, the candidate scheme with the largest minimum short-circuit ratio at the grid connection point of the new energy power station will be selected as the final configuration scheme for the grid-type SVG.

[0027] This invention also provides a system for implementing the grid-type SVG configuration method for improving the short-circuit ratio of multiple renewable energy power plants in a region, comprising a data acquisition module, an aggregation construction module, a first installation module, a first scheme module, a second installation module, a second scheme module, a third scheme module, and an SVG configuration module; the data acquisition module, aggregation construction module, first installation module, first scheme module, second installation module, second scheme module, third scheme module, and SVG configuration module are connected in series; the data acquisition module is used to acquire data information of the target power system and upload the data information to the aggregation construction module; the aggregation construction module is used to, based on the received data information, configure the SVG configuration according to the current data... According to the information, the short-circuit ratio of the grid connection point of new energy power plants connected to the same substation is calculated to construct a first short-circuit ratio data set, and the data information is uploaded to the first installation module. The first installation module is used to, based on the received data information, if there are nodes in the constructed first short-circuit ratio data set that do not meet the set short-circuit ratio requirements for multi-machine grid-connected nodes, then select the new energy power plant with the lowest grid connection point short-circuit ratio, calculate the minimum number of grid-type SVG units that need to be installed in that new energy power plant, and upload the data information to the first scheme module. The first scheme module is used to, based on the received data information, repeatedly combine the data construction module and the first installation module until the first short-circuit ratio data set is constructed. All nodes that meet the set short-circuit ratio requirements for multi-machine grid-connected nodes are recorded, along with the installation location and number of corresponding grid-type SVGs, to obtain candidate schemes. This data is then uploaded to the second installation module. The second installation module, based on the received data, adds a grid-type SVG to the low-voltage side of the target power system's substation and calculates the short-circuit ratio of the grid-connected points of new energy power plants connected to the same substation, thus constructing a second short-circuit ratio dataset. This dataset is then uploaded to the second scheme module. The second scheme module, based on the received data, determines whether any nodes in the constructed second short-circuit ratio dataset fail to meet the set short-circuit ratio requirements for multi-machine grid-connected nodes. For nodes that meet the requirements of the second short-circuit ratio data set, the second installation module, the first scheme module, and the first scheme module are used to obtain new candidate schemes and upload the data information to the third scheme module. The third scheme module is used to repeat the second installation module and the second scheme module according to the received data information to obtain corresponding new candidate schemes until all nodes in the constructed second short-circuit ratio data set meet the set short-circuit ratio requirements of multi-machine grid-connected nodes and upload the data information to the SVG configuration module. The SVG configuration module is used to select the final configuration scheme of the grid-type SVG from all the candidate schemes obtained according to the received data information and complete the configuration of the grid-type SVG of the target power system.

[0028] The present invention provides a method and system for configuring grid-type SVG to improve the short-circuit ratio of multiple new energy power stations in a region. Through multiple rounds of calculation of the short-circuit ratio of the grid connection points of new energy power stations and the calculation of the minimum number of grid-type SVG units that need to be installed in new energy power stations, the method not only completes the configuration of grid-type SVG while improving the short-circuit ratio of multiple new energy power stations in a region, but also has higher reliability, better accuracy, and higher efficiency. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the method flow of the present invention.

[0030] Figure 2 This is a schematic diagram of the equivalent circuit structure of the system side and the grid-type SVG of the new energy grid connection point of the present invention.

[0031] Figure 3 This is a schematic diagram of the functional modules of the system of the present invention. Detailed Implementation

[0032] like Figure 1 The diagram shown is a flowchart of the method of the present invention: The grid-type SVG configuration method for improving the short-circuit ratio of multiple new energy power stations in a region disclosed in this invention includes the following steps:

[0033] S1. Obtain data information about the target power system;

[0034] S2. Based on the current data, calculate the short-circuit ratio of the grid connection points of new energy power plants connected to the same substation, so as to construct the first short-circuit ratio data set;

[0035] S3. If there are nodes in the first short-circuit ratio data set constructed in step S2 that do not meet the set short-circuit ratio requirements for multi-machine grid-connected nodes, then select the new energy power station with the lowest grid-connected short-circuit ratio and calculate the minimum number of grid-type SVG units that need to be installed at the new energy power station.

[0036] S4. Repeat steps S2 to S3 until all nodes in the first short-circuit ratio data set constructed in step S2 meet the set short-circuit ratio requirements for multi-machine grid-connected nodes. Record the installation location and number of SVGs in the corresponding network configuration to obtain candidate solutions.

[0037] S5. Add a grid-connected SVG to the low-voltage side of the substation of the target power system, and calculate the short-circuit ratio of the grid connection point of the new energy power plants connected to the same substation to construct a second short-circuit ratio dataset; In specific implementation, this step is carried out on the basis of the most original target power system without considering the results of steps S2 to S4.

[0038] S6. If there are nodes in the second short-circuit ratio data set constructed in step S5 that do not meet the set short-circuit ratio requirements for multi-machine grid-connected nodes, then repeat steps S2 to S4 to obtain new candidate schemes.

[0039] S7. Repeat steps S5 to S6 and obtain corresponding new candidate schemes until all nodes in the second short-circuit ratio data set constructed in step S5 meet the set short-circuit ratio requirements for multi-machine grid-connected nodes.

[0040] S8. Among all the candidate schemes obtained, select the final configuration scheme of the grid-type SVG and complete the configuration of the grid-type SVG of the target power system.

[0041] After adding a grid-type SVG, the target power system of this invention can be equivalent to... Figure 2 The circuit shown; Figure 2 middle, This represents the short-circuit current injected into the j-th renewable energy power station. This represents the short-circuit current injected into the grid connection system of the new energy power station. This represents the total short-circuit current provided by n grid-type SVGs, where E represents the equivalent power supply on the system side. This represents the equivalent power source of a grid-type SVG. Let be the system equivalent impedance at the voltage level of the substation when the new energy source is connected to the grid at the i-th node. It represents the equivalent impedance of n network-type SVG when the i-th node is connected to the grid.

[0042] In practice, the calculation of the short-circuit ratio of the grid connection point of new energy power plants connected to the same substation, as described in steps S2 and S5, includes the following steps:

[0043] The short-circuit ratio at the grid connection point of the new energy power station is calculated using the following formula:

[0044] In the formula The short-circuit ratio of the grid connection point i of the new energy power station; The short-circuit capacity of the new energy power station's grid connection point i; Let be the power of the k-th new energy power station at grid connection point i; Let i be the mutual impedance of the k-th renewable energy power station at renewable energy grid connection node i; Let i be the self-impedance of the k-th renewable energy power station at renewable energy grid connection node i; The active power injected into the j-th renewable energy power station at renewable energy grid connection node i.

[0045] In practice, step S3 involves calculating the minimum number of grid-type SVG units that need to be installed at the new energy power station, which includes the following steps:

[0046] The requirement for the short-circuit ratio of the grid connection point of the new energy power station is set as follows: ;

[0047] The minimum number of grid-type SVG units required to be installed at this new energy power station can be calculated using the following formula. :

[0048] In the formula The minimum number of grid-type SVG units that need to be installed at this new energy power station; The short-circuit current injected into the system's side grid connection point i; The short-circuit current injected into the j-th renewable energy power station; n is the total number of renewable energy power stations; This represents the short-term maximum overload capacity of a single network-type SVG. Design capacity for a single network-type SVG; The design voltage level for a single grid-connected SVG; the transformer turns ratio for a single grid-connected SVG is... ; This is a rounding up operation.

[0049] In specific implementation, step S8, which involves selecting the final configuration scheme for the network-type SVG from all the candidate schemes obtained, specifically includes the following steps:

[0050] Among all the candidate schemes obtained, the scheme with the fewest number of network SVG units installed is selected as the final network SVG configuration scheme.

[0051] If there are several candidate schemes with the same number of grid-type SVG units installed, the candidate scheme with the largest minimum short-circuit ratio at the grid connection point of the new energy power station will be selected as the final configuration scheme for the grid-type SVG.

[0052] The method of the present invention will be further described below with reference to an embodiment:

[0053] Taking a prefecture-level 220 kV power grid as an example, this region has four 220 kV substations (NS) connected to wind farms, with a total wind farm capacity of 400 MW. The wind power simultaneity rate is taken as 0.4. The capacity of a single grid-connected SVG unit is 20 Mvar, the design voltage level is 35 kV, and the overcurrent capacity is 3 times.

[0054] First, the short-circuit examples of each new energy power station are calculated and shown in Table 1:

[0055] by As a constraint, for the GZY wind farm with the lowest short-circuit ratio, it was calculated that two 20 Mvar grid-type SVG units need to be installed on the low-voltage side of the wind farm. After modifying the simulation model, the short-circuit ratios of each new energy power station were recalculated, as shown in Table 2:

[0056] After further screening of TJ wind farms that do not meet the short-circuit ratio constraint, it was calculated that a 20 Mvar grid-type SVG needs to be installed on the low-voltage side of the wind farm. After modifying the simulation model, the short-circuit ratios of each new energy station were recalculated, as shown in Table 3:

[0057] All grid connection points meet the constraints, and the candidate scheme is to configure 2 grid-type SVG units on the low-voltage side of GZY wind farm and 1 grid-type SVG unit on the low-voltage side of TJ wind farm, for a total of 3 units.

[0058] Then, under the original target power system, without considering the previous candidate schemes, a grid-type SVG was configured on the low-voltage side of the NS transformer, and the simulation results of the short-circuit conditions of each new energy power station are shown in Table 4:

[0059] Again As a constraint, for the GZY wind farm with the lowest short-circuit ratio, it was calculated that one 20 Mvar grid-type SVG needs to be installed on the low-voltage side of the wind farm. After modifying the simulation model, the short-circuit ratios of each new energy power station were recalculated, as shown in Table 5:

[0060] All grid connection points meet the constraints, and the candidate scheme is to configure 1 SVG on the low-voltage side of the NS substation and 1 grid-type SVG on the low-voltage side of the GZY wind farm, for a total of 2 units.

[0061] One additional grid-type SVG was added to the low-voltage side of the NS transformer. The short-circuit ratios of each renewable energy power station were obtained through simulation, as shown in Table 6.

[0062] At this point, all grid connection points meet the constraints, and the candidate solution is to configure 2 grid-type SVG units on the low-voltage side of the NS substation, with a total configuration of 2 units.

[0063] Ultimately, the candidate scheme with the minimum number of grid-type SVG units was selected. At this point, there are two schemes: Scheme 1: 1 grid-type SVG is configured on the low-voltage side of the NS substation and 1 grid-type SVG is configured on the low-voltage side of the GZY wind farm; and Scheme 2: 2 grid-type SVGs are configured on the low-voltage side of the NS substation.

[0064] Then, after configuring Scheme 1, the minimum short-circuit ratio is 2.05; after configuring Scheme 2, the minimum short-circuit ratio is 2.00; therefore, Scheme 1 is selected: 1 grid-type SVG is configured on the low-voltage side of NS substation and 1 grid-type SVG is configured on the low-voltage side of GZY wind farm, as the final configuration scheme for grid-type SVG.

[0065] like Figure 3The diagram shows the functional modules of the system of the present invention: The system disclosed in this invention for implementing the grid-type SVG configuration method for improving the short-circuit ratio of multiple new energy power stations in a region includes a data acquisition module, an aggregation construction module, a first installation module, a first scheme module, a second installation module, a second scheme module, a third scheme module, and an SVG configuration module; the data acquisition module, aggregation construction module, first installation module, first scheme module, second installation module, second scheme module, third scheme module, and SVG configuration module are connected in series; the data acquisition module is used to acquire data information of the target power system and upload the data information to the aggregation construction module; the aggregation construction module is used to... Based on the received data, the short-circuit ratio of the grid connection point of new energy power plants connected to the same substation is calculated to construct a first short-circuit ratio data set, and the data is uploaded to the first installation module. The first installation module, based on the received data, if there are nodes in the constructed first short-circuit ratio data set that do not meet the set short-circuit ratio requirements for multi-machine grid-connected nodes, selects the new energy power plant with the lowest grid connection point short-circuit ratio, calculates the minimum number of grid-type SVG units that need to be installed at that new energy power plant, and uploads the data to the first scheme module. The first scheme module, based on the received data, repeats the process between the data construction module and the first installation module until the first short-circuit ratio data set is constructed. For nodes in a short-circuit ratio dataset that meet the set short-circuit ratio requirements for multi-machine grid-connected nodes, the installation location and number of corresponding grid-type SVGs are recorded to obtain candidate schemes, and the data information is uploaded to the second installation module. The second installation module is used to add a grid-type SVG to the low-voltage side of the substation of the target power system based on the received data information, and calculate the short-circuit ratio of the grid-connected points of new energy power plants connected to the same substation to construct a second short-circuit ratio dataset, and upload the data information to the second scheme module. The second scheme module is used to determine if there are nodes in the constructed second short-circuit ratio dataset that do not meet the set short-circuit ratio requirements for multi-machine grid-connected nodes. For nodes meeting the short-circuit ratio requirement, the process involves repeatedly using the set construction module, the first installation module, and the first scheme module to obtain new candidate schemes, and uploading the data information to the third scheme module. The third scheme module, based on the received data information, repeats the process of the second installation module and the second scheme module to obtain corresponding new candidate schemes, until all nodes in the constructed second short-circuit ratio data set meet the set short-circuit ratio requirement for multi-machine grid-connected nodes, and then uploads the data information to the SVG configuration module. The SVG configuration module, based on the received data information, selects the final configuration scheme for the network-type SVG from all the obtained candidate schemes, thus completing the configuration of the network-type SVG for the target power system.

Claims

1. A network configuration type SVG configuration method for improving short circuit ratio of regional new energy multi-field station, comprising the following steps: S1. Obtain data information of a target power system; S2. Calculate short circuit ratio of a new energy field station grid-connected point accessed to the same substation according to the current data information to construct a first short circuit ratio data set; S3. If there is a node in the first short circuit ratio data set constructed in step S2 that does not meet the set multi-machine grid-connected node short circuit ratio requirement, filter the new energy field station with the lowest grid-connected point short circuit ratio, and calculate the number of network configuration type SVGs at least needed to be installed in the new energy field station; S4. Repeat steps S2-S3 until all nodes in the first short circuit ratio data set constructed in step S2 meet the set multi-machine grid-connected node short circuit ratio requirement, record the installation position and installation number of the corresponding network configuration type SVG, and obtain a candidate scheme; S5. Increase a network configuration type SVG on the low-voltage side of the substation of the target power system, and calculate short circuit ratio of a new energy field station grid-connected point accessed to the same substation to construct a second short circuit ratio data set; S6. If there is a node in the second short circuit ratio data set constructed in step S5 that does not meet the set multi-machine grid-connected node short circuit ratio requirement, repeat steps S2-S4 to obtain a new candidate scheme; S7. Repeat steps S5-S6 and obtain a corresponding new candidate scheme until all nodes in the second short circuit ratio data set constructed in step S5 meet the set multi-machine grid-connected node short circuit ratio requirement; S8. Select a final network configuration type SVG configuration scheme from all obtained candidate schemes to complete the configuration of the network configuration type SVG of the target power system.

2. The network configuration method of the SVG for improving the short-circuit ratio of the new energy multi-field station in the lifting area according to claim 1, characterized in that The calculation of short circuit ratio of a new energy field station grid-connected point accessed to the same substation in steps S2 and S5 comprises the following steps: The short circuit ratio of the new energy field station grid-connected point is calculated by the following formula: In the formula is the short-circuit ratio of the new energy station grid-connected point i; is the short-circuit capacity of the new energy station grid-connected point i; is the power of the kth new energy station at the new energy station grid-connected point i; is the mutual impedance of the kth new energy station at the new energy station grid-connected point i; is the self-impedance of the kth new energy station at the new energy station grid-connected point i; is the injected active power of the jth new energy station at the new energy station grid-connected point i.

3. The network configuration method of the SVG for improving the short-circuit ratio of the new energy multi-field station in the lifting area according to claim 2, characterized in that The calculation of the number of network configuration type SVGs at least needed to be installed in the new energy field station in step S3 comprises the following steps: The requirement for setting the short-circuit ratio of the grid-connected point of the new energy station is ; The following formula is used to calculate the number of network configuration SVGs that need to be installed in the new energy station : In the formula is the number of network type SVGs at least needed to be installed in the new energy station; is the short-circuit current injected by the system side to the grid-connected point i; is the short-circuit current injected by the jth new energy station; n is the total number of new energy stations; is the short-time maximum overload capacity of a single network type SVG; is the design capacity of a single network type SVG; is the design voltage level of a single network type SVG; the transformer ratio of a single network type SVG is ; is a rounding up operation.

4. The network configuration method of the SVG of claim 3, wherein The selection of a final network configuration type SVG configuration scheme from all obtained candidate schemes in step S8 comprises the following steps: Select the scheme with the least number of installed network configuration type SVGs from all obtained candidate schemes as the final network configuration type SVG configuration scheme; If there are several candidate schemes with the same number of installed network configuration type SVGs, select the candidate scheme with the maximum lowest value of new energy field station grid-connected point short circuit ratio as the final network configuration type SVG configuration scheme.

5. A system for implementing the network configuration method of the SVG of claim 1-4 to improve the short circuit ratio of the new energy multi-field station in the promotion area, characterized in that The application comprises a data acquisition module, a set construction module, a first installation module, a first scheme module, a second installation module, a second scheme module, a third scheme module and an SVG configuration module; the data acquisition module, the set construction module, the first installation module, the first scheme module, the second installation module, the second scheme module, the third scheme module and the SVG configuration module are connected in series; the data acquisition module is used for acquiring data information of a target power system and uploading the data information to the set construction module; the set construction module is used for calculating short-circuit ratios of new energy station grid-connected points connected to the same substation according to the received data information and the current data information, constructing a first short-circuit ratio data set, and uploading the data information to the first installation module; The first installation module is used for screening a new energy station with the lowest grid-connected point short-circuit ratio from the first short-circuit ratio data set if there is a node that does not meet the set multi-machine grid-connected node short-circuit ratio requirement, calculating the number of network-type SVGs that need to be installed at least in the new energy station, uploading the data information to the first scheme module; the first scheme module is used for repeating the set construction module and the first installation module according to the received data information until all nodes in the first short-circuit ratio data set meet the set multi-machine grid-connected node short-circuit ratio requirement, recording the installation position and the number of installed network-type SVGs, obtaining a candidate scheme, and uploading the data information to the second installation module; The second installation module is used for increasing a network-type SVG at the low-voltage side of a substation of the target power system, calculating short-circuit ratios of new energy station grid-connected points connected to the same substation, constructing a second short-circuit ratio data set, and uploading the data information to the second scheme module; The second scheme module is used for repeating the set construction module, the first installation module and the first scheme module to obtain a new candidate scheme if there is a node that does not meet the set multi-machine grid-connected node short-circuit ratio requirement in the constructed second short-circuit ratio data set, and uploading the data information to the third scheme module; the third scheme module is used for repeating the second installation module and the second scheme module to obtain a corresponding new candidate scheme until all nodes in the constructed second short-circuit ratio data set meet the set multi-machine grid-connected node short-circuit ratio requirement, and uploading the data information to the SVG configuration module; the SVG configuration module is used for selecting a final network-type SVG configuration scheme from all obtained candidate schemes according to the received data information, and completing the configuration of the network-type SVG of the target power system.

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