Reactive compensation capacity configuration method and system for offshore wind power alternating current sending-out system

Abstract

The invention provides a reactive compensation capacity configuration method and system for an offshore wind power alternating current sending-out system. The method comprises the following steps: acquiring a system reactive power demand based on equipment parameters of the offshore wind power alternating current sending-out system; obtaining a reactive compensation capacity configuration initial range based on offshore wind plant grid-connected point voltage limitation and submarine cable line overvoltage limitation; obtaining a reactive compensation capacity configuration range based on current limitation along the offshore wind power alternating current output submarine cable; and determining a reactive power compensation capacity configuration scheme based on the reactive power compensation capacity configuration range and the system reactive power demand. According to the method, the reactive configuration and voltage criterion should be followed when the offshore wind plant is connected to the land power grid, the voltage and current along the submarine cable meet the voltage and current limiting conditions, and the system economy is considered, so that the high-resistance capacity configuration of the system is more economical and reliable.

Description

Technical Field

[0001] The present application belongs to the technical field of power system analysis, and relates to a method and system for configuring reactive power compensation capacity of an offshore wind power AC transmission system. Background Art

[0002] With the introduction of the "dual carbon" strategy, the proportion of new energy dominated by wind power is increasing. Offshore wind power resources are abundant and have huge potential. They are close to the eastern load center and can be easily consumed locally. The vigorous development of offshore wind power has become an important strategic support for my country's energy structure transformation.

[0003] Offshore wind power technology is relatively complex. As the distance from the shore increases, the reactive power generated by the submarine cable becomes larger, and reactive power compensation is required for the system. The traditional onshore wind power compensation method cannot be applied to offshore wind power. Offshore wind power reactive power compensation adopts the principle of layering and zoning. After compensation, the voltage and current along the submarine cable meet the restriction conditions. At the same time, the economic efficiency of the compensation scheme must also be considered. There are many factors to consider in the reactive power compensation scheme of offshore wind power. Reasonable selection of an economical and reliable reactive power compensation scheme can effectively improve the economic efficiency of the system and provide strong support for the grid parity of offshore wind power. Summary of the invention

[0004] The present application provides a reactive power compensation capacity configuration method and system for an offshore wind power AC transmission system, which is used to solve the technical problem of how to provide a more economical and reliable reactive power compensation capacity configuration solution.

[0005] In a first aspect, the present application provides a method for configuring reactive compensation capacity of an offshore wind power AC transmission system, comprising: obtaining the reactive power demand of the system based on equipment parameters of the offshore wind power AC transmission system; obtaining an initial range of reactive compensation capacity configuration based on voltage limitations at offshore wind farm grid connection points and overvoltage limitations along submarine cables; obtaining a reactive compensation capacity configuration range based on current limitations along offshore wind power AC transmission submarine cables; and determining a reactive compensation capacity configuration scheme based on the reactive compensation capacity configuration range and the system reactive power demand.

[0006] In an implementation of the first aspect, the equipment parameters include: offshore medium-voltage collector line parameters, box-type transformer parameters, main transformer parameters, high-voltage submarine cable parameters, and high-voltage land cable parameters.

[0007] In an implementation of the first aspect, obtaining the system reactive power demand based on the equipment parameters of the offshore wind power AC transmission system includes: accumulating the reactive power generated by the offshore medium-voltage collection line, box transformer, main transformer, high-voltage submarine cable and high-voltage land cable to obtain the system reactive power demand.

[0008] In an implementation of the first aspect, obtaining an initial range of reactive compensation capacity configuration based on the voltage limit of the offshore wind farm grid connection point and the overvoltage limit along the submarine cable includes: preliminarily determining a reactive compensation capacity configuration scheme through the voltage limit of the grid connection point; and performing an overvoltage limit analysis on the reactive compensation capacity configuration scheme to obtain an initial range of reactive compensation capacity configuration.

[0009] In an implementation of the first aspect, performing an overvoltage limitation analysis on the reactive compensation capacity configuration scheme to obtain an initial range of the reactive compensation capacity configuration includes: obtaining the power frequency overvoltage and operating overvoltage of the offshore wind farm transmission system under full load and no-load; and performing an overvoltage limitation analysis based on the power frequency overvoltage and the operating overvoltage to obtain the initial range of the reactive compensation capacity configuration.

[0010] In an implementation of the first aspect, the current limitation along the offshore wind power AC transmission submarine cable includes: the allowable current carrying capacity of each section of the offshore wind power AC transmission system submarine cable in the air, J-tube, seabed burial depth, and landing mudflat.

[0011] In an implementation of the first aspect, obtaining the reactive compensation capacity configuration range based on the current limitation along the offshore wind power AC transmission submarine cable includes: obtaining the current values ​​of each segment of the submarine cable of the offshore wind farm AC transmission system in the air, J-tube, seabed burial depth, and landing mudflat under full load; and obtaining the reactive compensation capacity configuration range based on the current value of each segment and the allowable current carrying capacity of each segment.

[0012] In an implementation of the first aspect, the reactive power compensation capacity configuration method of the offshore wind power AC transmission system further includes economic verification of the reactive power compensation capacity configuration scheme.

[0013] In the second aspect, the present application provides a reactive compensation capacity configuration system for an offshore wind power AC transmission system, including: an acquisition module for acquiring the system reactive power demand based on the equipment parameters of the offshore wind power AC transmission system; a voltage constraint module for acquiring the initial range of reactive power compensation capacity configuration based on the voltage limit of the offshore wind farm grid connection point and the overvoltage limit along the submarine cable; a current constraint module for acquiring the reactive power compensation capacity configuration range based on the current limit along the offshore wind power AC transmission submarine cable; a reactive capacity configuration module for determining the reactive compensation capacity configuration scheme based on the reactive compensation capacity configuration range and the system reactive power demand.

[0014] In an implementation of the second aspect, the reactive compensation capacity configuration system of the offshore wind power AC transmission system further includes an investment comparison module; the investment comparison module is used to perform economic verification on the reactive compensation capacity configuration scheme.

[0015] The method, system, device and medium for configuring reactive power compensation capacity of an offshore wind power AC transmission system described in the present application have the following beneficial effects:

[0016] First, this application constrains the voltage and current along the submarine cable and the voltage at the grid connection point, and verifies the economic feasibility of the reactive power compensation scheme. The reactive power compensation scheme is selected based on both reliability and economy.

[0017] Second, this application utilizes the constraints of submarine cable connection points, submarine cable overvoltage constraints, and current constraints along the submarine cable to gradually narrow the configuration range of high-voltage reactors and dynamic reactive compensation capacity and improve the accuracy of system reactive compensation.

[0018] Third, compared with the existing technology, this application can obtain the offshore wind power 220kV AC transmission reactive compensation capacity configuration faster and more accurately, improve energy utilization and reduce equipment costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 Shown is a flow chart of a method for configuring reactive compensation capacity of an offshore wind power AC transmission system described in one embodiment of the present application.

[0020] Figure 2 Shown is a flow chart of a method for configuring reactive compensation capacity of an offshore wind power AC transmission system described in one embodiment of the present application.

[0021] Figure 3 Shown is a flow chart of a method for configuring reactive compensation capacity of an offshore wind power AC transmission system described in one embodiment of the present application.

[0022] Figure 4 Shown is a flow chart of a method for configuring reactive compensation capacity of an offshore wind power AC transmission system described in one embodiment of the present application.

[0023] Figure 5 Shown is a schematic diagram of the architecture of a reactive compensation capacity configuration system for an offshore wind power AC transmission system according to an embodiment of the present application.

[0024] Figure 6 Shown is a schematic diagram of the structure of an electronic device described in an embodiment of the present application. DETAILED DESCRIPTION

[0025] The following describes the embodiments of the present application through specific examples, and those skilled in the art can easily understand other advantages and effects of the present application from the contents disclosed in this specification. The present application can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present application. It should be noted that the following embodiments and features in the embodiments can be combined with each other without conflict.

[0026] It should be noted that the illustrations provided in the following embodiments are only schematic illustrations of the basic concept of the present application, and thus the drawings only show components related to the present application rather than being drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component may be changed at will, and the component layout may also be more complicated.

[0027] In the embodiments of the present application, a method and system for configuring reactive power compensation capacity of an offshore wind power AC transmission system are provided. The method and system are based on the reactive power configuration and voltage criteria that should be followed when the offshore wind farm is connected to the onshore power grid. The voltage and current along the submarine cable are considered to meet the voltage and current limit conditions, and the economy of the system is taken into account, so that the high-resistance capacity configuration of the system is more economical and reliable.

[0028] See also Figure 1 As shown, a method for configuring reactive power compensation capacity of an offshore wind power AC transmission system provided by an embodiment of the present application includes the following steps S1 to S4:

[0029] S1: Obtain the reactive power demand of the system based on the equipment parameters of the offshore wind power AC transmission system.

[0030] Specifically, the equipment parameters include: offshore medium-voltage collector line parameters, box-type transformer parameters, main transformer parameters, high-voltage submarine cable parameters, and high-voltage land cable parameters.

[0031] Specifically, the implementation method of obtaining the reactive power demand of the system based on the equipment parameters of the offshore wind power AC transmission system includes: accumulating the reactive power generated by the offshore medium-voltage collector line, box transformer, main transformer, high-voltage submarine cable and high-voltage land cable to obtain the reactive power demand of the system. That is:

[0032]

[0033] Among them, Q 总 is the reactive power demand of the system, Q i It represents the reactive power generated by medium voltage collector lines, box transformers, main transformers, high voltage submarine cables and high voltage land cables.

[0034] Specifically, the main transformer is a step-up main transformer.

[0035] S2: Obtain the initial range of reactive power compensation capacity configuration based on the voltage limit of the offshore wind farm grid connection point and the overvoltage limit along the submarine cable.

[0036] Specifically, Figure 2 As shown, step S2 includes steps S21 to S22.

[0037] S21: Preliminarily determine the reactive power compensation capacity configuration plan through grid connection point voltage limitation.

[0038] Specifically, the voltage restriction of the offshore wind farm grid connection point includes: the voltage of the offshore wind farm grid connection point is within the range of 97% to 107% of the nominal voltage.

[0039] Specifically, the calculation formula of the grid connection point voltage can be expressed as:

[0040]

[0041] Among them, E is the grid connection point voltage, U is the high voltage side voltage of the wind farm step-up transformer, P Pcc , Q Pcc are the active power and reactive power output by the wind turbine respectively, and θ is the phase angle of the AC cable impedance.

[0042] S22: Perform overvoltage limitation analysis on the reactive power compensation capacity configuration scheme to obtain an initial range of reactive power compensation capacity configuration.

[0043] Specifically, it is determined whether the overvoltage along the submarine cable in the reactive compensation capacity configuration scheme determined in step S21 meets the access restriction requirements, thereby obtaining the initial range of the reactive compensation capacity configuration.

[0044] Specifically, Figure 3 As shown, step S22 includes steps S221 to S222.

[0045] S221: Obtain the power frequency overvoltage and operating overvoltage of the offshore wind farm transmission system under full load and no load.

[0046] Among them, the overvoltage limits of offshore wind power AC transmission include: the operating overvoltage along the submarine cable does not exceed 3.0pu of the standard voltage; the power frequency overvoltage along the submarine cable does not exceed 1.3pu of the standard voltage.

[0047] Specifically, the standard voltage is the maximum value of the three-phase voltage amplitude at both ends of the submarine cable, and the maximum operating voltage is 220kV. The amplitude comparison is converted into pu value.

[0048] Specifically, the power frequency overvoltage and operating overvoltage can be determined by establishing an electromagnetic transient simulation model for AC transmission of offshore wind power, and obtaining numerical results of the power frequency overvoltage and operating overvoltage through simulation experiments.

[0049] S222: Perform an overvoltage limitation analysis based on the power frequency overvoltage and the operating overvoltage to obtain an initial range of the reactive compensation capacity configuration.

[0050] Specifically, if both the power frequency overvoltage and the operation overvoltage meet the overvoltage limit, the current reactive capacity compensation configuration scheme is determined as the preliminary scheme. If it does not meet the overvoltage limit, the current reactive capacity compensation configuration scheme is excluded.

[0051] It should be noted that steps S21 to S22 are performed in sequence to obtain the initial range of reactive power compensation capacity configuration.

[0052] S3: Obtain the reactive power compensation capacity configuration range based on the current limitation along the offshore wind power AC transmission cable.

[0053] Specifically, the current restrictions along the offshore wind power AC transmission submarine cable include: the allowable current carrying capacity of each section of the offshore wind power AC transmission system submarine cable in the air, J-tube, seabed burial depth, and landing mudflat.

[0054] Specifically, Figure 4 As shown, step S3 includes steps S31 to S32.

[0055] S31: obtaining current values ​​of each segment of the submarine cable of the AC transmission system of the offshore wind farm under full load in the air, J-tube, seabed burial depth, and landing mudflat.

[0056] Specifically, the seabed burial depth segment is a segment at a seabed burial depth of 2 meters.

[0057] Specifically, the landing mudflat segment is the segmentation where the landing mudflat is buried at a depth of 1.5 meters.

[0058] Specifically, an electromechanical transient simulation model of an offshore wind power AC transmission system is established, and current values ​​of each segment of a submarine cable of the offshore wind farm AC transmission system are calculated through tidal current.

[0059] S32: Obtain the reactive compensation capacity configuration range based on the current value of each segment and the allowable current carrying capacity of each segment.

[0060] Specifically, if the current value of each segment is lower than the allowable current carrying capacity of each segment, the current reactive capacity compensation configuration scheme is determined as the configuration scheme. If the current value of each segment is not lower than the allowable current carrying capacity of each segment, the current reactive capacity compensation configuration scheme is excluded.

[0061] It should be noted that steps S31 to S32 are performed in sequence to obtain the reactive power compensation capacity configuration range.

[0062] S4: Determine a reactive power compensation capacity configuration plan based on the reactive power compensation capacity configuration range and the system reactive power demand.

[0063] Specifically, within the precise reactive power compensation capacity configuration range, a reactive power compensation capacity configuration scheme is determined based on the reactive power demand of the system.

[0064] It should be noted that the reactive power compensation of the offshore wind power AC transmission system is based on the principle of zero reactive power exchange between the wind farm and the power grid. Therefore, step S4 also needs to configure the dynamic reactive power compensation capacity in combination with the reactive power compensation principle of the system.

[0065] It should be noted that the reactive power compensation device of the offshore wind power AC transmission system includes: a high-voltage shunt reactor, a low-voltage shunt reactor, a dynamic reactive power compensation and an on-load voltage regulation reactive power compensation device.

[0066] In one embodiment, the present application adopts the most commonly used high-voltage shunt reactor and dynamic reactive power compensation device in engineering.

[0067] In addition, the reactive power compensation capacity configuration method for the offshore wind power AC transmission system provided in this application also performs an economic verification on the reactive power compensation capacity configuration scheme, that is, the economic efficiency of the offshore wind power AC transmission reactive power compensation system is taken into consideration, and the reactive power compensation capacity configuration scheme is verified with the minimum investment as a constraint.

[0068] Specifically, the total system cost is calculated based on the dynamic reactive power compensation and the unit cost of the reactor, and the most economical reactive power compensation scheme is determined based on the minimum total system cost.

[0069] The protection scope of the method for configuring reactive compensation capacity of an offshore wind power AC transmission system described in the embodiment of the present application is not limited to the execution order of the steps listed in the present embodiment. All solutions implemented by adding, reducing or replacing steps in the prior art based on the principles of the present application are included in the protection scope of the present application.

[0070] The embodiment of the present application also provides a reactive compensation capacity configuration system for an offshore wind power AC transmission system. The reactive compensation capacity configuration system for an offshore wind power AC transmission system can implement the reactive compensation capacity configuration method for an offshore wind power AC transmission system described in the present application. However, the implementation device of the reactive compensation capacity configuration method for an offshore wind power AC transmission system described in the present application includes but is not limited to the structure of the reactive compensation capacity configuration system for an offshore wind power AC transmission system listed in the present embodiment. All structural deformations and replacements of the prior art made according to the principles of the present application are included in the protection scope of the present application.

[0071] like Figure 5 As shown, the reactive power compensation capacity configuration system of the offshore wind power AC transmission system provided in this embodiment includes an acquisition module 10 , a voltage constraint module 20 , a current constraint module 30 and a reactive power capacity configuration module 40 .

[0072] The acquisition module 10 is used to acquire the reactive power demand of the system based on the equipment parameters of the offshore wind power AC transmission system.

[0073] The voltage constraint module 20 is used to obtain the initial range of reactive power compensation capacity configuration based on the voltage limit of the offshore wind farm grid connection point and the overvoltage limit along the submarine cable.

[0074] The current constraint module 30 is used to obtain the reactive compensation capacity configuration range based on the current limitation along the offshore wind power AC transmission cable.

[0075] The reactive capacity configuration module 40 is used to determine a reactive compensation capacity configuration scheme based on the reactive compensation capacity configuration range and the system reactive power demand.

[0076] Specifically, after the acquisition module 10 obtains the system reactive power demand according to the equipment parameters, the voltage constraint module 20 and the current constraint module 30 use the voltage limit of the submarine cable grid connection point, the overvoltage limit of the submarine cable, and the current limit along the submarine cable to accurately obtain the reactive power compensation capacity configuration range, and then the reactive power capacity configuration module 40 synchronously configures the dynamic reactive power compensation capacity according to the configuration range and the system reactive power demand.

[0077] The reactive power compensation capacity configuration system for the offshore wind power AC transmission system provided in the present application further includes an investment comparison module 50; the investment comparison module is used to perform economic verification on the reactive power compensation capacity configuration scheme.

[0078] The present application also provides an electronic device. Figure 6 As shown, this embodiment provides an electronic device 90, which includes: a memory 901, configured to store a computer program; and a processor 902, which is communicatively connected to the memory 901 and configured to call the computer program to execute the method for configuring reactive compensation capacity of the offshore wind power AC transmission system.

[0079] The memory 901 includes: ROM (Read Only Memory image), RAM (Random Access Memory), a disk, a USB flash drive, a memory card or an optical disk, and other media that can store program codes.

[0080] The processor 902 is connected to the memory 901 and is used to execute the computer program stored in the memory 901 so that the electronic device executes the above-mentioned method for configuring reactive compensation capacity of an offshore wind power AC transmission system.

[0081] Preferably, the processor 902 can be a general-purpose processor, including a central processing unit (CPU), a network processor (NP), etc.; it can also be a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components.

[0082] In the several embodiments provided in this application, it should be understood that the disclosed system, device or method can be implemented in other ways. For example, the device embodiments described above are only schematic, for example, the division of modules / units is only a logical function division, and there may be other division methods in actual implementation, for example, multiple modules or units can be combined or integrated into another system, or some features can be ignored or not executed.

[0083] The modules / units described as separate components may or may not be physically separated, and the components displayed as modules / units may or may not be physical modules, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the modules / units may be selected according to actual needs to achieve the purpose of the embodiments of the present application. For example, the functional modules / units in the various embodiments of the present application may be integrated into one processing module, or each module / unit may exist physically separately, or two or more modules / units may be integrated into one module / unit.

[0084] Those of ordinary skill in the art should further appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of the two. In order to clearly illustrate the interchangeability of hardware and software, the composition and steps of each example have been generally described in the above description according to function. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of this application.

[0085] The present application embodiment also provides a computer-readable storage medium. A person of ordinary skill in the art can understand that all or part of the steps in the method for implementing the above embodiment can be completed by instructing the processor through a program, and the program can be stored in a computer-readable storage medium, and the storage medium is a non-transitory medium, such as a random access memory, a read-only memory, a flash memory, a hard disk, a solid-state hard disk, a magnetic tape, a floppy disk, an optical disc, and any combination thereof. The above storage medium can be any available medium that a computer can access or a data storage device such as a server or a data center that includes one or more available media integrated. The available medium can be a magnetic medium (e.g., a floppy disk, a hard disk, a tape), an optical medium (e.g., a digital video disc (DVD)), or a semiconductor medium (e.g., a solid-state disk (SSD)), etc.

[0086] The present application embodiment may also provide a computer program product, the computer program product including one or more computer instructions. When the computer instructions are loaded and executed on a computing device, the process or function described in the embodiment of the present application is generated in whole or in part. The computer instructions may be stored in a computer-readable storage medium, or transmitted from one computer-readable storage medium to another computer-readable storage medium, for example, the computer instructions may be transmitted from a website site, computer or data center by wired (e.g., coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) mode to another website site, computer or data center.

[0087] When the computer program product is executed by a computer, the computer executes the method described in the above method embodiment. The computer program product may be a software installation package, and when the above method is required, the computer program product may be downloaded and executed on a computer.

[0088] The descriptions of the processes or structures corresponding to the above-mentioned figures have different emphases. For parts that are not described in detail in a certain process or structure, please refer to the relevant descriptions of other processes or structures.

[0089] The above embodiments are merely illustrative of the principles and effects of the present application and are not intended to limit the present application. Anyone familiar with the technology may modify or change the above embodiments without violating the spirit and scope of the present application. Therefore, all equivalent modifications or changes made by a person of ordinary skill in the art without departing from the spirit and technical ideas disclosed in the present application shall still be covered by the claims of the present application.

Claims

1. A method for configuring reactive power compensation capacity of an offshore wind power AC transmission system, characterized in that: include: Obtaining the reactive power demand of the system based on the equipment parameters of the offshore wind power AC transmission system; Obtain the initial range of reactive power compensation capacity configuration based on the voltage limit of the offshore wind farm grid connection point and the overvoltage limit along the submarine cable; Obtain the reactive power compensation capacity configuration range based on the current limit along the offshore wind power AC transmission cable; A reactive power compensation capacity configuration scheme is determined based on the reactive power compensation capacity configuration range and the system reactive power demand.

2. The method for configuring reactive power compensation capacity of an offshore wind power AC transmission system according to claim 1, characterized in that: The equipment parameters include: offshore medium-voltage collector line parameters, box-type transformer parameters, main transformer parameters, high-voltage submarine cable parameters, and high-voltage land cable parameters.

3. The method for configuring reactive power compensation capacity of an offshore wind power AC transmission system according to claim 2, characterized in that: The reactive power requirements of the equipment parameter acquisition system based on the offshore wind power AC transmission system include: The reactive power generated by the offshore medium-voltage collector line, box transformer, main transformer, high-voltage submarine cable and high-voltage land cable is accumulated and calculated to obtain the system reactive power demand.

4. The method for configuring reactive power compensation capacity of an offshore wind power AC transmission system according to claim 1, characterized in that: The initial range of reactive power compensation capacity configuration based on the voltage limit of the offshore wind farm grid connection point and the overvoltage limit along the submarine cable includes: Preliminarily determine the reactive power compensation capacity configuration plan through the grid connection point voltage limitation; An overvoltage limitation analysis is performed on the reactive power compensation capacity configuration scheme to obtain an initial range of reactive power compensation capacity configuration.

5. The method for configuring reactive power compensation capacity of an offshore wind power AC transmission system according to claim 4, characterized in that: Performing overvoltage limitation analysis on the reactive power compensation capacity configuration scheme to obtain an initial range of reactive power compensation capacity configuration includes: Obtain the power frequency overvoltage and operating overvoltage of the offshore wind farm transmission system under full load and no load; An overvoltage limitation analysis is performed based on the power frequency overvoltage and the operation overvoltage to obtain an initial range of the reactive compensation capacity configuration.

6. The method for configuring reactive power compensation capacity of an offshore wind power AC transmission system according to claim 1, characterized in that: The current limitation along the offshore wind power AC transmission submarine cable includes: the allowable current carrying capacity of each section of the offshore wind power AC transmission system submarine cable in the air, J-tube, seabed burial depth, and landing mudflat.

7. The method for configuring reactive power compensation capacity of an offshore wind power AC transmission system according to claim 6, characterized in that: The configuration range of reactive power compensation capacity based on the current limit along the offshore wind power AC transmission cable includes: Obtaining current values ​​of each segment of the submarine cable of the AC transmission system of the offshore wind farm in the air, J-tube, seabed burial depth, and landing beach under full load; The reactive compensation capacity configuration range is obtained based on the current value of each segment and the allowable current carrying capacity of each segment.

8. The reactive power compensation capacity configuration method for an offshore wind power AC transmission system according to claim 1 is further characterized in that: Carry out economic verification on the reactive power compensation capacity configuration plan.

9. A reactive power compensation capacity configuration system for an offshore wind power AC transmission system, characterized in that: include: An acquisition module, used to acquire the reactive power demand of the system based on the equipment parameters of the offshore wind power AC transmission system; The voltage constraint module is used to obtain the initial range of reactive power compensation capacity configuration based on the voltage limit of the offshore wind farm grid connection point and the overvoltage limit along the submarine cable; The current constraint module is used to obtain the reactive compensation capacity configuration range based on the current limit along the offshore wind power AC transmission cable; The reactive capacity configuration module is used to determine a reactive compensation capacity configuration scheme based on the reactive compensation capacity configuration range and the system reactive power demand.

10. The reactive power compensation capacity configuration system for an offshore wind power AC transmission system according to claim 9, characterized in that: The reactive power compensation capacity configuration system of the offshore wind power AC transmission system also includes an investment comparison module; the investment comparison module is used to perform economic verification on the reactive power compensation capacity configuration scheme.

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