New Energy Power Station Admittance Aggregation Method, Device, Storage Medium and Equipment

Abstract

The present invention provides a method, device, storage medium and equipment for aggregating admittances of a new energy power station, including the following steps: respectively obtaining the unit admittance models of each unit according to the preset parameters of each unit; obtaining the collector line models between each unit according to the collector lines connected between each unit; obtaining the branch admittance models of each branch according to the unit admittance models of each unit included in each branch and the collector line models between each unit; superimposing the branch admittance models included in each feeder to obtain the feeder admittance models of each feeder; obtaining the aggregated admittance model of the new energy power station according to the feeder admittance models of each feeder in the new energy power station and the reactive power compensation admittance model of the reactive power compensation device. Through the above method, a station admittance aggregation model with the same dimension as the unit matrix is formed, and the modeling efficiency of the admittance of the new energy power station is improved.

Description

Technical Field

[0001] The present invention relates to the field of new energy power stations, and particularly to a method, device, storage medium and equipment for admittance aggregation of new energy power stations. Background Art

[0002] In recent years, the problem of broadband oscillation in new energy power stations has occurred frequently, seriously affecting the safe and stable operation of the power system and the development of new energy. The essence of the new energy broadband oscillation problem is a small disturbance stability problem. Accurately describing the impedance characteristics of each new energy power station is an important basis for the analysis of broadband oscillation problems and the assessment of oscillation risks in new energy grid-connected power systems. Among the existing methods, except for the time-domain simulation method, the eigenvalue analysis method and the impedance analysis method are mostly used to describe the impedance characteristics of new energy power stations for the broadband oscillation problem.

[0003] Among them, due to its strong adaptability to the widespread "black box" or "gray box" problems of new energy converters, the impedance analysis method has been widely used in the analysis of oscillation problems and oscillation assessment of new energy grid-connected power systems in recent years. At the same time, the research on the oscillation problem of the new energy power station grid-connected system mostly uses the impedance / admittance model represented by the equivalent of the power station. However, there are generally multiple feeders inside the new energy power station, and there are multiple new energy power generation units on the feeders. The electrical distances of the power generation units inside the power station from the grid connection point and the received wind energy or solar energy are also different. If the impedance / admittance of the power station is simply equivalent, it may not be possible to obtain relatively accurate impedance characteristics. At the same time, there are many units inside the power station, and the topology structure of the collector line is complex. If only written according to the node impedance / admittance equation, the order of the power station model matrix will be too high, which is not conducive to subsequent calculation and analysis. If the simple impedance / admittance series-parallel method is used for calculation, it will lead to a large workload and low efficiency in impedance / admittance modeling. Summary of the Invention

[0004] Based on this, the present invention provides a method, device, storage medium and equipment for admittance aggregation of new energy power stations. By using the node admittance matrix of the new energy power station and considering each power generation unit and each section of the collector line inside the power station, a complete impedance characteristic model of the power station is established to form an admittance aggregation model with the same matrix dimension as that of a single unit. At the same time, based on the structural characteristics of the new energy power station, this method uses iteration to replace the complex series calculation of the admittance matrix, which is easy to be programmed to improve the modeling efficiency of the impedance / admittance of the new energy power station.

[0005] In a first aspect, the present invention provides a method for admittance aggregation of a new energy power station. The new energy power station includes a reactive power compensation device and a plurality of feeders. Each feeder includes one or more branches, and each branch includes one or more units. The method includes the following steps:

[0006] Obtain the unit admittance model of each unit according to the preset parameters of each unit;

[0007] Based on the collector lines connecting between each unit, obtain the collector line models between each unit;

[0008] Based on the unit admittance models of each unit included in each branch and the collector line models between each unit, obtain the branch admittance models of each branch;

[0009] Superimpose the branch admittance models of the branches included in each feeder to obtain the feeder admittance models of each feeder;

[0010] Obtain the reactive power compensation admittance model of the reactive power compensation device in the new energy power station;

[0011] Based on the feeder admittance models of each feeder in the new energy power station and the reactive power compensation admittance model of the reactive power compensation device, obtain the aggregated admittance model of the new energy power station.

[0012] Wherein, the obtaining of the unit admittance model of each unit according to the preset parameters of each unit is specifically as follows:

[0013] If the structure of the unit and the state parameters corresponding to the structure are known, obtain the port voltage and port current of the unit, and input the structure of the unit, the state parameters corresponding to the structure, the port voltage and the port current into the unit admittance models of each unit obtained respectively according to the preset state space model;

[0014] Or if the structure and parameters of the unit are unknown, obtain the port voltage and port current of the unit, and determine the unit admittance models of each unit according to the frequency scanning method and the port voltage and port current of the unit.

[0015] In a second aspect, the present invention further provides a new energy power station admittance aggregation device. The new energy power station includes a reactive power compensation device and a plurality of feeders. Each feeder includes one or more branches, and each branch includes one or more units. The device includes:

[0016] A unit admittance calculation module, configured to obtain the unit admittance models of each unit according to the preset parameters of each unit respectively;

[0017] A line admittance calculation module, configured to obtain the collector line models between each unit based on the collector lines connecting between each unit;

[0018] A branch admittance calculation module, configured to obtain the branch admittance models of each branch according to the unit admittance models of each unit included in each branch and the collector line models between each unit;

[0019] A feeder admittance calculation module, configured to superimpose the branch admittance models of the branches included in each feeder to obtain the feeder admittance model of each feeder;

[0020] A reactive power compensation admittance acquisition module, configured to acquire the reactive power compensation admittance model of a reactive power compensation device in a new energy power station;

[0021] A power station admittance calculation module, configured to obtain the aggregated admittance model of the new energy power station according to the feeder admittance models of the feeders in the new energy power station and the reactive power compensation admittance model of the reactive power compensation device.

[0022] In a third aspect, the present invention further provides a computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, the steps of any one of the new energy power station admittance aggregation methods in the first aspect are implemented.

[0023] In a fourth aspect, the present invention further provides a computer device, including a memory and a processor. The memory stores a computer program. When the processor executes the computer program, any one of the new energy power station admittance aggregation methods in the first aspect is executed.

[0024] The beneficial effects of adopting the above technical solutions are as follows: By modularly dividing the new energy power station model, the admittance models of new energy units and collector lines are established respectively. The admittance model of the branch is obtained by aggregating the admittance models of the new energy units and the collector lines. Then, the admittance model of the feeder is obtained by aggregating the admittance models of the branches. Finally, the admittance models of each feeder and the admittance model of the port reactive power compensation device are added together to obtain the aggregated admittance model of the new energy power station, comprehensively considering the influence of each new energy unit and each section of the collector line inside the new energy power station on the impedance characteristics of the power station. At the same time, for the feeder branches with relatively complex series-parallel relationships, by referring to the power network nodes, the branch admittance model is calculated by establishing the branch node admittance matrix, which reduces the aggregation difficulty and improves the calculation efficiency of the new energy power station. Moreover, the dimension of the obtained branch admittance model is the same as that of a single new energy unit, which is convenient for subsequent calculation of the feeder admittance model and the aggregated admittance model of the power station. Description of the Drawings

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art.

[0026] Figure 1 It is a schematic structural diagram of a new energy power station in an embodiment of the present application;

[0027] Figure 2 It is a schematic diagram of a new energy power station admittance aggregation method in an embodiment of the present application;

[0028] Figure 3 It is a schematic diagram of the admittance of a unit with known structure and state parameters in a new energy power station in an embodiment of the present application;

[0029] Figure 4 It is a schematic diagram of the admittance of a unit with unknown structure and state parameters in a new energy power station in an embodiment of the present application;

[0030] Figure 5 It is a schematic diagram of the branch structure of a feeder in a new energy power station in an embodiment of the present application;

[0031] Figure 6 It is a schematic diagram of the admittance aggregation device in a new energy power station in an embodiment of the present application. Specific embodiments

[0032] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention. To describe the present invention in more detail, the new energy power station admittance aggregation method, device, storage medium and equipment provided by the present invention will be specifically described below in conjunction with the drawings.

[0033] The development space of resources such as wind energy and solar energy is further released. The large-scale grid connection of new energy and the formation of a high-voltage direct current transmission network have led to the operation of power electronic loads. The power system is facing more and more wide-frequency oscillation problems. Wide-frequency oscillations may damage power equipment and cause the shutdown of new energy generating units, etc., seriously affecting equipment safety and threatening the stable operation of the system, and becoming one of the serious risks threatening the stable operation of the high-proportion new energy system. Accurately describing the impedance characteristics of each new energy power station is an important basis for the analysis of wide-frequency oscillation problems and the assessment of oscillation risks in new energy grid-connected power systems. At present, most studies on oscillation problems in new energy power station grid-connected systems use impedance / admittance models represented by power station equivalents.

[0034] The embodiment of the present application provides an application scenario of the new energy power station admittance aggregation method. The application scenario includes the terminal device provided in the embodiment. The terminal device includes, but is not limited to, smart phones and computer devices, where the computer device may be at least one of devices such as desktop computers, portable computers, laptop computers, mainframe computers, and tablet computers. The user operates the terminal device to obtain the aggregated admittance model of the new energy power station. For the specific process, please refer to the embodiment of the new energy power station admittance aggregation method.

[0035] Combined with the attached Figure 1As shown in the figure, the new energy power station includes a reactive power compensation device and several feeders. Among them, the new energy power station includes y feeders, which are respectively marked as feeder 1, feeder 2... feeder y; for the topological structure of each feeder, each of the feeders includes one or more branches, which are respectively marked as branch 1, branch 2... branch x; then, according to the topological structure of each branch, several units and the collector lines between the units are identified. Each of the branches includes one or more units, where the units can be marked as unit 1, unit 2... unit n, and the collector line between unit 1 and unit 2 is marked as line 1-2, the collector line between unit 2 and unit 3 is marked as line 2-3... the collector line between unit n-1 and unit n is marked as line n-1-n.

[0036] Based on this, an embodiment of the present invention provides a method for aggregating admittances of a new energy power station. Taking the application of this method to a terminal device as an example for illustration, combined with the attached Figure 2 Schematic diagram of the admittance aggregation method of the new energy power station shown.

[0037] Step S101, obtain the unit admittance model of each unit according to the preset parameters of each unit.

[0038] Among them, there are two situations for obtaining the unit admittance model of each unit according to the preset parameters of each unit, specifically:

[0039] (1) If the structure of the unit and the state parameters corresponding to the structure are known, obtain the port voltage and port current of the unit, and input the structure of the unit, the state parameters corresponding to the structure, the port voltage and the port current into the state space model preset respectively to obtain the unit admittance model of each unit.

[0040] Combined with the unit admittance schematic diagram shown in the attached Figure 3 figure, inputting the structure of the unit, the state parameters corresponding to the structure, the port voltage and the port current into the state space model preset respectively to obtain the unit admittance model of each unit, the specific expression is:

[0041]

[0042] The above expression can be further deduced as:

[0043]

[0044] The above expression can be finally deduced to obtain:

[0045] Y W (s)=(C(sI - A) -1 B + D),

[0046] where, ΔX Wis the unit state variable, Δu W is the terminal voltage of the unit, Δi W is the terminal current of the unit, Y W (s) is the unit admittance model of the unit, s is the input quantity after Laplace transform of the unit input quantity, I is the identity matrix, A is the first coefficient matrix of the state space model, B is the second coefficient matrix of the state space model, C is the third coefficient matrix of the state space model, and D is the fourth coefficient matrix of the state space model.

[0047] (2) If the structure and parameters of the unit are unknown, obtain the terminal voltage and terminal current of the unit, and determine the unit admittance model of each unit according to the frequency scanning method and the terminal voltage and terminal current of the unit.

[0048] Combined with the attached Figure 4 Shown unit admittance schematic diagram, the unit admittance model of each unit determined according to the frequency scanning method and the terminal voltage and terminal current of the unit is specifically:

[0049] Y W (s) = i meas (s) / u meas (s),

[0050] where, Y W (s) is the unit admittance model of the unit, s is the input quantity after Laplace transform of the unit input quantity, u meas (s) is the terminal voltage of the unit, i meas (s) is the terminal current of the unit.

[0051] Step S102, according to the collector lines connected between each unit, obtain the collector line model between each unit.

[0052] Among them, since the collector lines connected between each unit in the new energy power station are not long, the π-type equivalent circuit will be used for modeling, and the collector line model between two units can be denoted as Y m(i,i+1) , indicating the collector line model between the i-th unit and the (i + 1)-th unit.

[0053] Step S103, according to the unit admittance models of each unit included in each branch and the collector line models between each unit, obtain the branch admittance models of each branch.

[0054] Specifically, combined with the attached Figure 5 Shown schematic diagram of the structure of the units included in the branch and the collector lines between each unit in the new energy power station, calculate the branch admittance models of each branch through the nodal admittance matrix.

[0055] The specific expression of the branch admittance model is:

[0056]

[0057] Among them, Y ix (S) is the branch admittance model of the xth branch in the ith feeder, I(s) is the input current of the branch port, U1(s) is the port voltage of the first unit in the branch, and the admittance matrix of the branch node is

[0058]

[0059] P i = P(i, i), P i is the element in the ith row and ith column of matrix P, P n ′ = Y Wn + Y m(n-1,n) , Y W1 is the unit admittance model of the first unit in the branch, Y W2 is the unit admittance model of the second unit in the branch, is the unit admittance model of the (n - 1)th unit in the branch, is the unit admittance model of the nth unit in the branch, Y m(1,2) is the collector line model between the first unit and the second unit in the branch, Y m(2,3) is the collector line model between the second unit and the third unit in the branch, Y m(n-2,n-1) is the collector line model between the (n - 2)th unit and the (n - 1)th unit in the branch, Y m(n-1,n) is the collector line model between the (n - 1)th unit and the nth unit in the branch; and

[0060]

[0061] Among them, I(s) is the input current of the branch port, U1(s) is the port voltage of the first unit in the branch, U2(s) is the port voltage of the second unit in the branch, U n-1 (s) is the port voltage of the (n - 1)th unit in the branch, U n (s) is the port voltage of the nth unit in the branch.

[0062] Since all elements in the first row of the node admittance matrix except the first and second columns are zero, all elements in the last row except the penultimate and antepenultimate columns are zero, and all elements in the ith row except the (i - 1)th, ith, and (i + 1)th columns are zero, the matrix can be eliminated upward starting from the last column, retaining only one element in each row. Finally, the branch admittance model of the branch is the single element remaining in the first row, that is

[0063] From the above element elimination process, it can be seen that the branch admittance model has the same dimension as the admittance model of the new energy unit.

[0064] Step S104: Superimpose the branch admittance models of the branches included in each feeder to obtain the feeder admittance model of each feeder.

[0065] Specifically, the specific expression of the feeder admittance model of the feeder is:

[0066] Y i (s) = Y i1 (s) + Y i2 (s) + … + Y ix (s),

[0067] where Y i (s) is the feeder admittance model of the i-th feeder, Y i1 (s) is the branch admittance model of the first branch in the i-th feeder, Y i2 (s) is the branch admittance model of the second branch in the i-th feeder, Y ix (s) is the branch admittance model of the x-th branch in the i-th feeder.

[0068] Step S105: Obtain the reactive power compensation admittance model of the reactive power compensation device in the new energy substation.

[0069] Among them, the reactive power compensation device has the functions of reactive power compensation and voltage regulation, and is used to improve the power quality. In this embodiment, the reactive power compensation device includes but is not limited to static var compensator (SVG), static var compensator (SVC), etc. The reactive power compensation device can comprehensively manage problems such as voltage fluctuation and flicker, harmonics, and voltage unbalance.

[0070] Step S106: Obtain the aggregated admittance model of the new energy substation according to the feeder admittance models of each feeder in the new energy substation and the reactive power compensation admittance model of the reactive power compensation device.

[0071] Y total (s) = Y(s) + Y RC (s),

[0072] where Y total (s) is the aggregated admittance of the new energy substation, Y(s) is the sum of the feeder admittance models of all feeders in the new energy substation, Y(s) = Y1(s) + Y2(s) + … + Y y (s), Y1(s) is the feeder admittance model of the first feeder, Y2(s) is the feeder admittance model of the second feeder, Y y(s) is the feeder admittance model of the y-th feeder, Y RC (s) is the reactive power compensation admittance model of the reactive power compensation device

[0073] By modularly dividing the new energy power station model, the admittance models of new energy units and collector lines are established respectively. The admittance model of the branch is obtained by aggregating the admittance models of new energy units and collector lines. Then, the admittance models of feeders are obtained by aggregating the admittance models of branches. Finally, the admittance models of each feeder and the admittance model of the port reactive power compensation device are added together to obtain the aggregated admittance model of the new energy power station, comprehensively considering the influence of each new energy unit and each section of collector line inside the new energy power station on the impedance characteristics of the power station. At the same time, for the feeder branches with relatively complex series-parallel relationships, referring to the nodes of the power network, the branch admittance model is calculated by establishing the branch node admittance matrix, which reduces the aggregation difficulty and improves the calculation efficiency of the new energy power station. Moreover, the dimension of the obtained branch admittance model is the same as that of a single new energy unit, which is convenient for subsequent calculation of the feeder admittance model and the aggregated admittance model of the power station.

[0074] It should be understood that although each step in the attached Figure 2 flow chart is shown in sequence according to the arrow indication, these steps do not necessarily need to be executed in the order indicated by the arrow. Unless there is a clear description in this article, there is no strict order restriction for the execution of these steps, and these steps can be executed in other orders. Moreover, at least a part of the steps in the attached Figure 2 can include multiple sub-steps or sub-phases. These sub-steps or phases do not necessarily need to be executed at the same moment, but can be executed at different moments. The execution order of these sub-steps or phases is not necessarily sequential either, but can be executed alternately or in turn with at least a part of other steps or sub-steps or phases of other steps.

[0075] In the above embodiments disclosed by the present invention, the new energy power station admittance aggregation method is described in detail. The above method disclosed by the present invention can be implemented by various forms of devices. Therefore, the present invention also discloses a new energy power station admittance aggregation device corresponding to the above method. Combining the attached Figure 6 , specific embodiments are given below for detailed description.

[0076] The new energy power station includes a reactive power compensation device and several feeders. Each feeder includes one or more branches, and each branch includes one or more units. The new energy power station admittance aggregation device includes the following modules:

[0077] The unit admittance calculation module 201 is used to obtain the unit admittance model of each unit according to the preset parameters of each unit.

[0078] The line admittance calculation module 202 is configured to obtain the collector line models between each unit according to the collector lines connected between each unit.

[0079] The branch admittance calculation module 203 is configured to obtain the branch admittance models of each branch according to the unit admittance models of each unit included in each branch and the collector line models between each unit.

[0080] The feeder admittance calculation module 204 is configured to superimpose the branch admittance models of the branches included in each feeder to obtain the feeder admittance models of each feeder.

[0081] The reactive power compensation admittance acquisition module 205 is configured to obtain the reactive power compensation admittance model of the reactive power compensation device in the new energy power station.

[0082] The power station admittance calculation module 206 is configured to obtain the aggregated admittance model of the new energy power station according to the feeder admittance models of each feeder in the new energy power station and the reactive power compensation admittance model of the reactive power compensation device.

[0083] For the admittance aggregation device of the new energy power station, all can be referred to the above limitations on the method, and will not be elaborated here. Each module in the above device can be implemented in whole or in part by software, hardware and their combination. Each of the above modules can be embedded in the processor of the terminal device in hardware form or independent of it, or stored in the memory of the terminal device in software form, so that the processor can call and execute the operations corresponding to each of the above modules.

[0084] In one embodiment, the present invention further provides a computer-readable storage medium, on which a computer program is stored, and when the computer program is executed by a processor, the steps of the above new energy power station admittance aggregation method are implemented.

[0085] The computer-readable storage medium may be an electronic memory such as flash memory, EEPROM (electrically erasable programmable read-only memory), EPROM (erasable programmable read-only memory), hard disk or ROM. Optionally, the computer-readable storage medium includes a non-transitory computer-readable storage medium. The computer-readable storage medium has a storage space for program codes for executing any method steps in the above method. These program codes can be read from one or more computer program products or written into one or more computer program products, and the program codes can be compressed in an appropriate form.

[0086] In one embodiment, the present invention provides a computer device, including a memory and a processor. The memory stores a computer program, and when the processor executes the computer program, it executes the above-mentioned admittance aggregation method for new energy power stations.

[0087] The computer device includes a memory, a processor, and one or more computer programs. One or more computer programs can be stored in the memory and configured to be executed by one or more processors. One or more application programs are configured to execute the above-mentioned admittance aggregation method for new energy power stations.

[0088] The processor may include one or more processing cores. The processor connects various parts within the entire computer device using various interfaces and lines. By running or executing instructions, programs, code sets, or instruction sets stored in the memory, and by calling data stored in the memory, it executes various functions of the computer device and processes data. Optionally, the processor can be implemented in at least one hardware form of digital signal processing (DSP), field-programmable gate array (FPGA), or programmable logic array (PLA). The processor can integrate one or a combination of several of a central processing unit (CPU), a graphics processing unit (GPU) for reporting and verifying buried point data, and a modem, etc. Among them, the CPU mainly processes the operating system, user interface, and application programs, etc.; the GPU is responsible for rendering and drawing the displayed content; the modem is used to process wireless communication. It can be understood that the above-mentioned modem may not be integrated into the processor and can be implemented separately through a communication chip.

[0089] The memory can include random access memory (RAM) and can also include read-only memory. The memory can be used to store instructions, programs, code, code sets, or instruction sets. The memory can include a program storage area and a data storage area. Among them, the program storage area can store instructions for implementing the operating system, instructions for implementing at least one function (such as touch function, sound playback function, image playback function, etc.), instructions for implementing the above-mentioned various method embodiments, etc. The data storage area can also store data created during the use of the terminal device.

[0090] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A method for aggregating admittances of a new energy power station, the new energy power station including a reactive power compensation device and a plurality of feeders, each of the feeders including one or more branches, and each of the branches including one or more units, characterized in that, The method includes the following steps: Respectively obtain the unit admittance models of each unit according to the preset parameters of each unit; Obtain the collector line models between each unit according to the collector lines connected between each unit; Obtain the branch admittance models of each branch according to the unit admittance models of each unit included in each branch and the collector line models between each unit; Superimpose the branch admittance models of the branches included in each feeder to obtain the feeder admittance models of each feeder; Obtain the reactive power compensation admittance model of the reactive power compensation device in the new energy power station; Obtain the aggregated admittance model of the new energy power station according to the feeder admittance models of each feeder in the new energy power station and the reactive power compensation admittance model of the reactive power compensation device; The obtaining the branch admittance models of each branch according to the unit admittance models of each unit included in each branch and the collector line models between each unit is specifically: Among them, Y ix (S) is the branch admittance model of the x-th branch in the i-th feeder, I(s) is the input current of the branch port, U1(s) is the port voltage of the first unit in the branch, and the admittance matrix of the branch node P i = P(i, i), where P i is the element in the i-th row and i-th column of matrix P, and P n ′ = Y Wn + Y m(n-1,n) , Y W1 is the unit admittance model of the first unit in the branch, and Y W2 is the unit admittance model of the second unit in the branch, is the unit admittance model of the (n - 1)-th unit in the branch, is the unit admittance model of the n-th unit in the branch. Y m(1,2) is the model of the collector line between the first unit and the second unit in the branch, Y m(2,3) is the model of the collector line between the second unit and the third unit in the branch, Y m(n-2,n-1) is the model of the collector line between the (n - 2)th unit and the (n - 1)th unit in the branch, Y m(n-1,n) is the model of the collector line between the (n - 1)th unit and the nth unit in the branch.

2. The admittance aggregation method for new energy power stations according to claim 1, wherein The respectively obtaining the unit admittance models of each unit according to the preset parameters of each unit is specifically: If the structure of the unit and the state parameters corresponding to the structure are known, obtain the terminal voltage and terminal current of the unit, and input the structure of the unit, the state parameters corresponding to the structure, the terminal voltage and the terminal current into the unit admittance models of each unit respectively obtained according to the preset state space model; Or if the structure and parameters of the unit are unknown, obtain the terminal voltage and terminal current of the unit, and determine the unit admittance models of each unit according to the frequency scanning method and the terminal voltage and terminal current of the unit.

3. The admittance aggregation method for new energy power stations according to claim 2, wherein The inputting the structure of the unit, the state parameters corresponding to the structure, the terminal voltage and the terminal current into the unit admittance models of each unit respectively obtained according to the preset state space model is specifically: Y W (s) = (C(sI - A) -1 B + D), Among them, Y W (s) is the unit admittance model of the unit, s is the input quantity after Laplace transform of the unit input quantity, I is the identity matrix, A is the first coefficient matrix of the state space model, B is the second coefficient matrix of the state space model, C is the third coefficient matrix of the state space model, and D is the fourth coefficient matrix of the state space model.

4. The admittance aggregation method for new energy power stations according to claim 2, characterized in that The determining the unit admittance models of each unit according to the frequency scanning method and the terminal voltage and terminal current of the unit is specifically: Y W (s) = i meas (s) / u meas (s), Among them, Y W (s) is the admittance model of the unit, s is the input quantity after Laplace transform of the unit input quantity, u meas (s) is the terminal voltage of the unit, i meas (s) is the terminal current of the unit.

5. The admittance aggregation method for new energy power stations according to claim 1, characterized in that The superimposing the branch admittance models of the branches included in each feeder to obtain the feeder admittance models of each feeder, and the specific expression is: Y i (s) = Y i1 (s) + Y i2 (s) + … + Y ix (s), where Y i (s) is the feeder admittance model of the i-th feeder, Y i1 (s) is the branch admittance model of the first branch in the i-th feeder, Y i2 (s) is the branch admittance model of the second branch in the i-th feeder, Y ix (s) is the branch admittance model of the x-th branch in the i-th feeder.

6. The admittance aggregation method for new energy power stations according to claim 1, wherein The obtaining the aggregated admittance of the new energy power station according to the feeder admittance models of each feeder in the new energy power station and the reactive power compensation admittance model of the reactive power compensation device, and the specific expression is: Y total (s) = Y(s) + Y RC (s), Among them, Y total (s) is the aggregated admittance of the new energy power station, Y(s) is the sum of the feeder admittance models of all feeders in the new energy power station, Y(s)=Y1(s)+Y2(s)+…+Y y (s), Y1(s) is the feeder admittance model of the first feeder, Y2(s) is the feeder admittance model of the second feeder, Y y (s) is the feeder admittance model of the y-th feeder, Y RC (s) is the reactive power compensation admittance model of the reactive power compensation device.

7. A new energy power station admittance aggregation device, the new energy power station includes a reactive power compensation device and a plurality of feeders, each of the feeders includes one or more branches, and each of the branches includes one or more units, characterized in that, The device includes: A unit admittance calculation module, configured to respectively obtain the unit admittance models of each unit according to the preset parameters of each unit; A line admittance calculation module, configured to obtain the collector line models between each unit according to the collector lines connected between each unit; A branch admittance calculation module, configured to obtain the branch admittance models of each branch according to the unit admittance models of each unit included in each branch and the collector line models between each unit; A feeder admittance calculation module, configured to superimpose the branch admittance models of the branches included in each feeder to obtain the feeder admittance models of each feeder; A reactive power compensation admittance acquisition module, configured to obtain the reactive power compensation admittance model of the reactive power compensation device in the new energy power station; A substation admittance calculation module, configured to obtain an aggregated admittance model of the new energy substation according to a feeder admittance model of each feeder in the new energy substation and a reactive power compensation admittance model of a reactive power compensation device; The step of obtaining a branch admittance model of each branch according to a unit admittance model of each unit included in each branch and a collector line model between each unit specifically is: Among them, Y ix (S) is the branch admittance model of the x-th branch in the i-th feeder, I(s) is the input current at the branch port, U1(s) is the port voltage of the first unit in the branch, and the admittance matrix of the branch node P i = P(i, i), where P i is the element in the i-th row and i-th column of matrix P, and P n ′ = Y Wn + Y m(n-1,n) , Y W1 is the unit admittance model of the first unit in the branch, and Y W2 is the unit admittance model of the second unit in the branch, is the unit admittance model of the (n - 1)-th unit in the branch, is the unit admittance model of the n-th unit in the branch. Y m(1,2) is the model of the collector line between the first unit and the second unit in the branch, Y m(2,3) is the model of the collector line between the second unit and the third unit in the branch, Y m(n-2,n-1) is the model of the collector line between the (n - 2)-th unit and the (n - 1)-th unit in the branch, Y m(n-1,n) is the model of the collector line between the (n - 1)-th unit and the n-th unit in the branch.

8. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by a processor, the steps of the new energy substation admittance aggregation method according to any one of claims 1-6 are implemented.

9. A computer device, comprising a memory and a processor, the memory storing a computer program, characterized in that, When the processor executes the computer program, the new energy substation admittance aggregation method according to any one of claims 1-6 is executed.

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