Topological structure and parameter design method of main circuit for offshore wind farm with low frequency ac transmission system

Abstract

The application discloses a kind of offshore wind power low-frequency AC transmission system main loop topology and parameter design method, system, equipment, medium and program, belong to wind power generation technical field.The method includes obtaining electrical parameters in offshore wind power low-frequency AC transmission system;According to the electrical parameters in offshore wind power low-frequency AC transmission system, design bridge arm reactor in converter main loop topology;According to the bridge arm reactor in converter main loop topology designed, determine the sub-module capacitance value in converter main loop topology, obtain converter main loop topology and parameter design scheme;Converter main loop topology and parameter design scheme are verified, find the optimal converter main loop topology and parameter design scheme, according to converter main loop topology and parameter design scheme, complete the construction of converter main loop topology.The method effectively reduces line capacitance effect, reduces system loss and voltage fluctuation, while reducing sub-module capacitance and overall volume.

Description

Technical Field

[0001] This invention relates to the field of wind power generation technology, specifically to a method, system, equipment, medium, and program for designing the topology and parameters of the main circuit of an offshore wind power low-frequency AC transmission system. Background Technology

[0002] Offshore wind power, as an important renewable energy source, has become a hot topic in the energy sector due to its significant advantages, such as abundant resources, no land occupation, stable wind speeds, and high wind energy density. Its development scale is continuously expanding. However, offshore wind farms are often far from onshore load centers, making efficient, long-distance power transmission a key issue restricting the large-scale development of offshore wind power.

[0003] Currently, traditional power transmission methods face numerous challenges in long-distance transmission of offshore wind power. Conventional AC transmission systems, especially at long distances, exhibit significant line capacitance effects, leading to increased reactive power and exacerbated voltage fluctuations. This necessitates the addition of substantial reactive power compensation equipment, increasing system cost and complexity, and also results in significant energy losses and reduced transmission efficiency. While DC transmission systems offer advantages such as low losses and the absence of capacitance effects for medium- and long-distance transmission, their converter stations are complex and costly. Furthermore, for the fluctuating and intermittent nature of offshore wind power, controlling the DC converter process is challenging, impacting the system's stable operation. Summary of the Invention

[0004] To address the problems of increased reactive power, voltage fluctuations, and high losses caused by long-distance line capacitance effects in existing offshore wind power transmission technologies, this invention provides a main circuit topology and parameter design method for a low-frequency AC transmission system for offshore wind power. Through the design of the main circuit topology and optimized parameters of an M3C (Modular Multilevel Matrix Converter), the line capacitance effect is effectively reduced, system losses and voltage fluctuations are decreased, and the capacitance of sub-modules and the overall size are reduced, thereby improving the economy and reliability of long-distance offshore wind power transmission.

[0005] To achieve the above objectives, the present invention provides the following technical solution.

[0006] In a first aspect, the present invention provides a method for designing the main circuit topology and parameters of an offshore wind power low-frequency AC transmission system, comprising: Obtain electrical parameters from offshore wind power low-frequency AC transmission systems; Design the bridge arm reactor in the main circuit topology of the converter based on the electrical parameters of the offshore wind power low-frequency AC transmission system; Based on the bridge arm reactors in the designed converter main circuit topology, the capacitance values ​​of the sub-modules in the converter main circuit topology are determined, and the converter main circuit topology and parameter design scheme is obtained. The design scheme of the converter main circuit topology and parameters is verified, the optimal design scheme of the converter main circuit topology and parameters is found, and the converter main circuit topology is constructed according to the design scheme of the converter main circuit topology and parameters.

[0007] As a further improvement of the present invention, the acquisition of electrical parameters in the offshore wind power low-frequency AC transmission system includes: the rated power of the offshore wind power low-frequency AC transmission system, the rated frequency and line voltage of the power grids on both sides, the power factor, redundancy requirements, and offshore operating environment conditions.

[0008] As a further improvement of the present invention, the design of the bridge arm reactor in the converter main circuit topology based on the electrical parameters of the offshore wind power low-frequency AC transmission system includes: Based on the electrical parameters of the offshore wind power low-frequency AC transmission system, the design of the bridge arm reactor needs to meet the constraints. Based on the constraints that the arm reactors need to meet, design the arm reactors in the main circuit topology of the converter.

[0009] As a further improvement of the present invention, the design of the arm reactor based on the electrical parameters of the offshore wind power low-frequency AC transmission system needs to meet the constraints, including circulating current suppression constraints, arm current balance constraints, and fault current limiting constraints. Circulation suppression constraints:

[0010] in, For switching frequency, The maximum permissible circulation pulsation; The design inductance value of the bridge arm reactor; This is the DC side voltage; Bridge arm current balance constraints:

[0011] In the formula, A virtual inductance set in the control system; This is the equivalent series inductance on the system side; Fault current limiting constraints:

[0012] In the formula, This is the equivalent voltage applied to the reactor during the fault; This is the maximum fault current that the system is allowed to pass. Let be the angular frequency of the system.

[0013] As a further improvement of the present invention, based on the arm reactors in the main circuit topology of the converter, the capacitance values ​​of the sub-modules in the main circuit topology of the converter are determined, resulting in a converter main circuit topology and parameter design scheme, including: Based on the bridge arm reactors in the main circuit topology of the converter, determine the capacitance value C of the submodule in the main circuit topology of the converter.

[0014] In the formula, This refers to the capacitance value of the submodule. This represents the peak value of the bridge arm voltage. The design inductance value of the bridge arm reactor; This is the system reference frequency; This refers to the grid-side frequency. This is the low-frequency side frequency; This refers to the number of sub-modules in a single bridge arm. Equivalent inductance; Frequency ratio; Verify whether the capacitance value C of the submodule meets the volatility requirement; if it does, determine the capacitance type. By summarizing several capacitor types, a converter main circuit topology and parameter design scheme is generated.

[0015] As a further improvement of the present invention, the verification of the converter main circuit topology and parameter design scheme, finding the optimal converter main circuit topology and parameter design scheme, and constructing the converter main circuit topology based on the converter main circuit topology and parameter design scheme, includes: The design scheme of the converter main circuit topology and parameters is verified to determine whether the design scheme meets the operation requirements of the offshore wind power low-frequency AC transmission system. If the requirements are met, equipment selection will be carried out to complete the construction of the converter main circuit topology.

[0016] Secondly, the present invention provides a main circuit topology and parameter design system for an offshore wind power low-frequency AC transmission system, comprising: Electrical parameter module: used to acquire electrical parameters in offshore wind power low-frequency AC transmission systems; Arm reactor module: Used to design the arm reactor in the converter main circuit topology based on the electrical parameters of the offshore wind power low-frequency AC transmission system; Design Scheme Module: Used to determine the capacitance value of the sub-module in the main circuit topology of the converter based on the bridge arm reactor in the designed converter main circuit topology, and obtain the converter main circuit topology and parameter design scheme; Main loop topology construction module: used to verify the converter main loop topology and parameter design scheme, find the optimal converter main loop topology and parameter design scheme, and complete the construction of the converter main loop topology based on the converter main loop topology and parameter design scheme.

[0017] Thirdly, the present invention provides an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the main circuit topology and parameter design method of an offshore wind power low-frequency AC transmission system.

[0018] Fourthly, the present invention provides a computer-readable storage medium storing a computer program, which, when executed by a processor, implements the main circuit topology and parameter design method for a low-frequency AC power transmission system for offshore wind power.

[0019] Fifthly, the present invention provides a computer program product, including computer instructions, which, when executed by a processor, implement the main circuit topology and parameter design method for a low-frequency AC power transmission system for offshore wind power.

[0020] Compared with the prior art, the present invention has the following beneficial effects: This invention effectively reduces line capacitance effect by employing M3C converter topology and optimized parameter design. Reducing line capacitance effect directly decreases reactive power increase, making the power transmission system more stable during energy transmission and avoiding numerous problems caused by excessive reactive power, thereby significantly reducing system losses and voltage fluctuations. This change not only improves the efficiency of power transmission and reduces energy waste during transmission but also ensures the safe and stable operation of the power system, reducing the risk of damage to electrical equipment caused by voltage fluctuations. Secondly, this invention achieves a reduction in submodule capacitance and overall volume. During the main circuit topology and parameter design process, the bridge arm reactors are precisely designed based on electrical parameters, and the submodule capacitance values ​​are determined accordingly. Through design and optimization, the demand for submodule capacitance is reduced, thereby reducing the overall system volume. In offshore wind power scenarios, space resources are extremely valuable. Reducing the system volume means that more equipment can be arranged within a limited space or space can be reserved for other related facilities, improving the space utilization rate of offshore platforms and reducing construction costs and operation and maintenance difficulties. Attached Figure Description

[0021] The accompanying drawings described herein are for illustrative purposes only and are not intended to limit the scope of the invention in any way. In the drawings: Figure 1This is a flowchart illustrating the design method of the main circuit topology and parameters for a low-frequency AC transmission system for offshore wind power according to the present invention. Figure 2 This is a schematic diagram of the main circuit topology and parameter design system for a low-frequency AC power transmission system for offshore wind power according to the present invention; Figure 3 This is a schematic diagram of an electronic device in an embodiment of the present invention. Detailed Implementation

[0022] To enable those skilled in the art to better understand the technical solutions of this invention, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings. The described embodiments are merely some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of this invention.

[0023] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0024] To address the problems of increased reactive power, voltage fluctuations, and high losses caused by long-distance capacitance effects in existing offshore wind power transmission technologies, this invention provides a main circuit topology and parameter design method for a low-frequency AC transmission system for offshore wind power, such as... Figure 1 As shown, it includes: S100: Obtain electrical parameters from the offshore wind power low-frequency AC transmission system; S200: Design the bridge arm reactor in the converter main circuit topology based on the electrical parameters of the offshore wind power low-frequency AC transmission system; S300: Based on the bridge arm reactors in the designed converter main circuit topology, determine the submodule capacitance values ​​in the converter main circuit topology to obtain the converter main circuit topology and parameter design scheme; S400: Verify the converter main circuit topology and parameter design scheme, find the optimal converter main circuit topology and parameter design scheme, and complete the construction of the converter main circuit topology based on the converter main circuit topology and parameter design scheme.

[0025] This method effectively reduces line capacitance effect, system loss and voltage fluctuation through M3C topology and optimized parameter design. At the same time, it reduces submodule capacitance and overall size, improving the economy and reliability of long-distance offshore wind power transmission.

[0026] The present invention will be further explained and described below with reference to specific technical solutions.

[0027] A method for designing the main circuit topology and parameters of a low-frequency AC transmission system for offshore wind power, comprising: S1: Electrical parameter input serves as the starting point of the entire design process. It is necessary to clearly define key electrical parameters, including the system's rated power, the rated frequency and line voltage of the power grids on both sides, power factor, redundancy requirements, and marine operating environment conditions. These basic data together form the benchmark for the design and selection calculation of all key equipment parameters, such as bridge arm reactors and submodule capacitors.

[0028] Input parameters include: system rated power (MW); Rated frequency on the grid side (Hz, e.g., 50Hz); Low-frequency side rated frequency (Hz, e.g., 16.67Hz); Rated line voltage on the grid side (kV); Rated line voltage on the low-frequency side (kV); System rated power factor Redundancy design requirements (such as N+1 or N+2); operating environment conditions.

[0029] S2: Calculation of bridge arm reactance in the main circuit topology of M3C.

[0030] The purpose of designing bridge arm reactors is to limit circulating current, balance bridge arm energy, and suppress harmonics.

[0031] Design constraints include: circulating current suppression constraints, bridge arm current balance constraints, and fault current limiting constraints.

[0032] Circulation suppression constraints:

[0033] in, For switching frequency, The maximum permissible circulation pulsation; The design inductance value of the bridge arm reactor; This is the DC side voltage.

[0034] The bridge arm current balance constraint is derived from the M3C mathematical model:

[0035] In the formula, A virtual inductance set in the control system; This is the equivalent series inductance on the system side.

[0036] In the M3C, the three arms of each input phase share a circulating current. The circulating current dynamic equation is obtained by establishing and summing the voltage equations for the three arms. Then, a virtual reactance is introduced by designing a circulating current controller. To suppress circulating current. Consider system-side inductance. Subsequently, to ensure the stability and performance of the circulating current control system, the design inductance value of the bridge arm reactor was... Need to meet Furthermore, in order to limit the amplitude of the circulation, it is required that (Per unit value).

[0037] This constraint ensures the design inductance value of the bridge arm reactor. Controlling virtual reactance and system inductance Mutual matching effectively suppresses circulating current and maintains power balance between bridge arms.

[0038] Fault current limiting constraints:

[0039] In the formula, This is the equivalent voltage applied to the reactor during the fault; This is the maximum fault current that the system is allowed to pass. Let be the angular frequency of the system.

[0040] Calculate the effective value of the fundamental current of the bridge arm based on the system voltage and current. Determine the switching frequency And modulation strategy; substitute into the above constraint formula to solve for the range of reactance values ​​that satisfy all conditions; select standardized reactance values, considering magnetic materials (iron core / air core), thermal design, and insulation class. Obtain the design value of the bridge arm reactor. (mH), including parameters such as inductance, rated current, and thermal load.

[0041] S3: Determine the capacitor value of the submodule in M3C to support the voltage stability of the submodule and buffer energy fluctuations.

[0042]

[0043] In the formula, This refers to the capacitance value of the submodule. This represents the peak value of the bridge arm voltage. The design inductance value of the bridge arm reactor; This is the system reference frequency; This refers to the grid-side frequency. This is the low-frequency side frequency; This refers to the number of sub-modules in a single bridge arm. Equivalent inductance; This represents the frequency ratio.

[0044] Voltage fluctuation constraints: Allowable submodule voltage fluctuation rate ( The range is 5% to 10%); among which, This represents the amplitude of the capacitor voltage fluctuation. This represents the maximum voltage fluctuation rate. This verifies whether the capacitor value meets the fluctuation rate requirement. It also verifies whether the capacitor's energy storage can support the system's energy demands during frequency changes and power surges.

[0045] After verification, determine the capacitor type, such as film capacitor or electrolytic capacitor; consider capacitance value, voltage rating, ESR, temperature characteristics, etc.

[0046] Obtain the capacitance value of the submodule (mF), capacitor datasheet, which includes voltage, capacitance, size, and quantity.

[0047] S4: Equipment Selection Verification Verify whether the designed parameters meet the system operation requirements and complete the selection of key equipment.

[0048] Validation Project: IGBT module selection: Voltage level: ; Current rating: ; Verify whether the switching loss and conduction loss are within the allowable range.

[0049] Submodule count verification:

[0050] in, This represents the total number of submodules that ultimately need to be installed in a single bridge arm; The rated voltage for the submodule is used, and the number of redundant modules is configured as N+1 or N+2. The peak value of the rated AC voltage that the bridge arm needs to withstand; The number of redundant submodules configured for each bridge arm.

[0051] Thermal design and heat dissipation verification: Calculate the total system losses; verify whether the heat dissipation scheme meets the temperature rise requirements.

[0052] Control strategy compatibility verification: Verify whether the designed parameters are suitable for the preset modulation strategy; simulate and verify dynamic response and fault ride-through capability.

[0053] Compare the validated solutions to each other, including their cost, volume, and weight; assess the feasibility of installation on offshore platforms, and find the optimal solution.

[0054] We obtained the equipment selection list, simulation verification report, and design compliance confirmation.

[0055] If the equipment selection verification fails, return to the corresponding S1 step to adjust the parameters; if the reactor overheats, return to S2 to adjust. Alternatively, replace the materials; if the voltage fluctuation exceeds the limit, return to S3 to increase the capacitor or adjust the frequency parameters; if the current / voltage is insufficient, return to S1 to adjust the system voltage level or power level.

[0056] The second objective of this invention is to propose a main circuit topology and parameter design system for offshore wind power low-frequency AC transmission systems, such as... Figure 2 As shown, it includes: Electrical parameter module 100: used to acquire electrical parameters in offshore wind power low-frequency AC transmission systems; Arm reactor module 200: Used to design the arm reactor in the converter main circuit topology based on the electrical parameters of the offshore wind power low-frequency AC transmission system; Design Scheme Module 300: Used to determine the capacitance value of the sub-module in the main circuit topology of the converter based on the bridge arm reactor in the designed converter main circuit topology, and obtain the converter main circuit topology and parameter design scheme; Main loop topology construction module 400: Used to verify the converter main loop topology and parameter design scheme, find the optimal converter main loop topology and parameter design scheme, and complete the construction of the converter main loop topology based on the converter main loop topology and parameter design scheme.

[0057] like Figure 3 As shown, a third objective of this invention is to provide an electronic device comprising a processor 501, a memory 502, and a display screen 503. The memory 502 and the display screen 503 are both connected to the processor 501, such as via a bus 504. Optionally, the electronic device may further include a transceiver 505. It should be noted that in practical applications, the transceiver 505 is not limited to one type, and the structure of this electronic device does not constitute a limitation on the embodiments of this application.

[0058] Processor 501 may be a CPU (Central Processing Unit), a general-purpose processor, a DSP (Digital Signal Processor), an ASIC (Application Specific Integrated Circuit), an FPGA (Field Programmable Gate Array), or other programmable logic devices, transistor logic devices, hardware components, or any combination thereof. It can implement or execute the various exemplary logic blocks, modules, and circuits described in conjunction with the disclosure of this application. Processor 501 may also be a combination that implements computational functions, such as including one or more microprocessor combinations, a combination of a DSP and a microprocessor, etc.

[0059] Bus 504 may include a pathway for transmitting information between the aforementioned components. Bus 504 may be a PCI (Peripheral Component Interconnect) bus or an EISA (Extended Industry Standard Architecture) bus, etc. Bus 504 can be divided into address bus, data bus, control bus, etc.

[0060] The memory 502 may be a ROM (Read Only Memory) or other type of static storage device capable of storing static information and instructions, RAM (Random Access Memory) or other type of dynamic storage device capable of storing information and instructions, or an EEPROM (Electrically Erasable Programmable Read Only Memory), CD-ROM (Compact Disc Read Only Memory) or other optical disc storage, optical disc storage (including compressed optical discs, laser discs, optical discs, digital universal optical discs, Blu-ray discs, etc.), magnetic disk storage media or other magnetic storage devices, or any other medium capable of carrying or storing desired program code in the form of instructions or data structures and accessible by a computer, but not limited thereto.

[0061] The memory 502 is used to store application code that executes the solution of this application, and its execution is controlled by the processor 501. The processor 501 is used to execute the application code stored in the memory 502 to implement the content shown in the foregoing method embodiments.

[0062] Figure 3 The electronic device shown is merely an example and should not impose any limitation on the functionality and scope of use of the embodiments of this application.

[0063] A fourth objective of this invention is to provide a computer-readable storage medium storing a computer program thereon, which, when executed by a processor, performs the aforementioned functions. Figure 1 The illustrated method embodiments include various processes. For example, a memory may include instructions that can be executed by a processor of an electronic device to perform the described method.

[0064] A computer-readable storage medium can be a tangible device that holds and stores instructions used by an instruction execution device. A computer-readable storage medium can be, but is not limited to, an electrical storage device, a magnetic storage device, an optical storage device, an electromagnetic storage device, a semiconductor storage device, or any combination thereof. Specifically, a computer-readable storage medium can be a portable computer disk, a hard disk, a USB flash drive, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), staging random access memory (SRAM), portable compact disc read-only memory (CD-ROM), digital multifunction disc (DVD), memory stick, floppy disk, optical disk, magnetic disk, mechanical encoding device, or any combination thereof.

[0065] A fifth objective of this invention is to provide a computer program product comprising computer instructions that, when executed by a processor, implement the above-described... Figure 1 The various processes of the method embodiments shown can achieve the same technical effect, and will not be described again here to avoid repetition.

[0066] Many embodiments and applications beyond the examples provided will be apparent to those skilled in the art upon reading the foregoing description. Therefore, the scope of this teaching should not be determined by reference to the foregoing description, but rather by reference to the foregoing claims and the full scope of their equivalents. For purposes of completeness, all articles and references, including patent applications and published disclosures, are incorporated herein by reference.

[0067] The above content provides a further detailed description of the present invention. It should not be construed that the specific embodiments of the present invention are limited to this. For those skilled in the art, several simple deductions or substitutions can be made without departing from the concept of the present invention, and all such deductions or substitutions should be considered to fall within the scope of protection of the present invention.

Claims

1. A method for designing the main circuit topology and parameters of a low-frequency AC transmission system for offshore wind power, characterized in that, include: Obtain electrical parameters from offshore wind power low-frequency AC transmission systems; Design the bridge arm reactor in the main circuit topology of the converter based on the electrical parameters of the offshore wind power low-frequency AC transmission system; Based on the bridge arm reactors in the designed converter main circuit topology, the capacitance values ​​of the sub-modules in the converter main circuit topology are determined, and the converter main circuit topology and parameter design scheme is obtained. The design schemes for the converter main circuit topology and parameters are verified to find the optimal design scheme. The converter main circuit topology is then constructed based on the design scheme.

2. The method for designing the main circuit topology and parameters of a low-frequency AC transmission system for offshore wind power according to claim 1, characterized in that, The acquisition of electrical parameters in the offshore wind power low-frequency AC transmission system includes: the rated power of the offshore wind power low-frequency AC transmission system, the rated frequency and line voltage of the power grids on both sides, the power factor, redundancy requirements, and the offshore operating environment conditions.

3. The method for designing the main circuit topology and parameters of a low-frequency AC transmission system for offshore wind power according to claim 1, characterized in that, The design of the bridge arm reactor in the converter main circuit topology based on the electrical parameters of the offshore wind power low-frequency AC transmission system includes: Based on the electrical parameters of the offshore wind power low-frequency AC transmission system, the design of the bridge arm reactor needs to meet the constraints. Based on the constraints that the arm reactors need to meet, design the arm reactors in the main circuit topology of the converter.

4. The method for designing the main circuit topology and parameters of a low-frequency AC transmission system for offshore wind power according to claim 3, characterized in that, Based on the electrical parameters of the offshore wind power low-frequency AC transmission system, the design of the arm reactor needs to meet the constraints, including circulating current suppression constraints, arm current balance constraints, and fault current limiting constraints. Circulation suppression constraints: in, For switching frequency, The maximum permissible circulation pulsation; The design inductance value of the bridge arm reactor; This is the DC side voltage; Bridge arm current balance constraints: In the formula, A virtual inductance set in the control system; This is the equivalent series inductance on the system side; Fault current limiting constraints: In the formula, This is the equivalent voltage applied to the reactor during the fault; This is the maximum fault current that the system is allowed to pass. Let be the angular frequency of the system.

5. The method for designing the main circuit topology and parameters of a low-frequency AC transmission system for offshore wind power according to claim 1, characterized in that, Based on the bridge arm reactors in the main circuit topology of the converter, the capacitance values ​​of the submodules in the main circuit topology are determined, resulting in the converter main circuit topology and parameter design scheme, including: Based on the bridge arm reactors in the main circuit topology of the converter, determine the capacitance value C of the submodule in the main circuit topology of the converter. In the formula, This refers to the capacitance value of the submodule. This represents the peak value of the bridge arm voltage. The design inductance value of the bridge arm reactor; This is the system reference frequency; This refers to the grid-side frequency. This is the low-frequency side frequency; This refers to the number of sub-modules in a single bridge arm. Equivalent inductance; Frequency ratio; Verify whether the capacitance value C of the submodule meets the volatility requirement; if it does, determine the capacitance type. By summarizing several capacitor types, a converter main circuit topology and parameter design scheme is generated.

6. The method for designing the main circuit topology and parameters of a low-frequency AC transmission system for offshore wind power according to claim 1, characterized in that, The process involves verifying the converter main loop topology and parameter design scheme, finding the optimal converter main loop topology and parameter design scheme, and constructing the converter main loop topology based on the design scheme, including: The design scheme of the converter main circuit topology and parameters is verified to determine whether the design scheme meets the operation requirements of the offshore wind power low-frequency AC transmission system. If the requirements are met, equipment selection will be carried out to complete the construction of the converter main circuit topology.

7. A main circuit topology and parameter design system for an offshore wind power low-frequency AC transmission system, based on the main circuit topology and parameter design method for an offshore wind power low-frequency AC transmission system according to any one of claims 1-6, characterized in that, include: Electrical parameter module: used to acquire electrical parameters in offshore wind power low-frequency AC transmission systems; Arm reactor module: Used to design the arm reactor in the converter main circuit topology based on the electrical parameters of the offshore wind power low-frequency AC transmission system; Design Scheme Module: Used to determine the capacitance value of the sub-module in the main circuit topology of the converter based on the bridge arm reactor in the designed converter main circuit topology, and obtain the converter main circuit topology and parameter design scheme; Main loop topology construction module: used to verify the converter main loop topology and parameter design scheme, find the optimal converter main loop topology and parameter design scheme, and complete the construction of the converter main loop topology based on the converter main loop topology and parameter design scheme.

8. An electronic device, characterized in that, The system includes a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, it implements the main circuit topology and parameter design method for a low-frequency AC power transmission system for offshore wind power as described in any one of claims 1-6.

9. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores a computer program, which, when executed by a processor, implements the main circuit topology and parameter design method for a low-frequency AC power transmission system for offshore wind power as described in any one of claims 1-6.

10. A computer program product, characterized in that, It includes computer instructions that, when executed by a processor, implement the main circuit topology and parameter design method for a low-frequency AC power transmission system for offshore wind power as described in any one of claims 1-6.

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