A method and system for selecting grounding cable for wind turbine generator set

Abstract

The present invention discloses a method and system for selecting a grounding cable for a wind turbine generator set. The method comprises: determining the cross-sectional parameters of the generator grounding cable and the actual cross-sectional parameters of the single cable components of the remaining components in the cabin according to the target parameters of the required cable; determining the lightning protection grounding cross-sectional parameters according to the location where the cable is applied; and determining the number of generator grounding cables and the total number of cables between the cabin grounding bar and the grounding ring respectively. The system comprises a component design module, a lightning protection design module and a quantity design module. The present invention has both a method for selecting components and an overall selection method. Starting from the perspectives of economy and practicality, it meets both the requirements of normal operation and the requirements of economy, and alleviates the problem of cable twisting in saddle bridges caused by multiple cables to a certain extent.

Description

Technical Field

[0001] The invention relates to the technical field of wind turbine accessories, and in particular to a method and system for selecting a grounding cable for a wind turbine. Background Art

[0002] Wind turbines are located in special environments such as high and low temperatures, high vibration, salt spray corrosion, and electromagnetic interference. The grounding cable design must meet both dynamic stability requirements and thermal stability needs.

[0003] As the capacity of wind turbines gradually increases, the number of grounding cables required also increases. As the height of wind turbines increases, the twisting problem of multiple cables at the saddle bridge becomes an important factor restricting cable laying. Therefore, appropriate optimization of the grounding cable entry is necessary. In order to ensure the safe and stable operation of wind turbines and reduce the burden caused by cable twisting at the saddle bridge, it is crucial to optimize the design of grounding cables.

[0004] In the paper "Selection of Grounding Cables in Wind Turbines", the selection of equipotential connection cables and surge protection grounding cables is explained, and the grounding cables of major components such as generators and converters can be designed, but the overall grounding cable selection is not reflected in the paper. In actual design, the overall grounding cable is a simple superposition of individual grounding cables. There is no overall optimization design of the grounding cable. Although the simple number superposition can meet the basic needs of the grounding cable, it increases the number of cable designs and increases the impact of cable twisting. At the same time, the economic efficiency is not strong.

[0005] At present, there is a lack of design for grounding cable selection. More attention is paid to grounding cable incoming line detection and fault judgment. The commonly used design is to obtain the grounding cable of the unit by superimposing the grounding cables of the components. There is no explanation for the selection of grounding cables shared by different components. In actual selection, the number of actual selections is likely to be far greater than the demand, and the economic efficiency cannot be reflected. Summary of the invention

[0006] In view of this, the purpose of an embodiment of the present invention is to provide a method and system for selecting a grounding cable for a wind turbine, which includes both a method for selecting components and an overall selection method. From the perspective of economy and practicality, it not only meets the requirements of normal operation, but also meets the requirements of economy, and has a certain degree of relief on the problem of cable twisting caused by saddle bridge cables.

[0007] In a first aspect, an embodiment of the present invention provides a method for selecting a grounding cable for a wind turbine generator set, comprising:

[0008] According to the target parameters of the required cables, the cross-sectional parameters of the generator grounding cable and the actual cross-sectional parameters of the single cable components of the remaining components in the nacelle are determined.

[0009] Determine the lightning protection grounding cross-section parameters according to the location where the cable is used.

[0010] Determine the number of generator grounding cables and the total number of cables from the cabin grounding bar to the grounding ring.

[0011] In combination with the first aspect, an embodiment of the present invention provides a first possible implementation manner of the first aspect, wherein determining the generator grounding cable cross-sectional parameters and the actual grounding cable cross-sectional parameters of the cable single components of the remaining components of the nacelle according to the target parameters of the required cable includes:

[0012] Determine the cross-section of the protective conductor based on the cross-section of the phase conductor.

[0013] Calculate the number of protective conductors n = protective conductor cross-section / single conductor cross-section. If there is a remainder, round up the number n.

[0014] Calculate the effective length of the cable based on the path between the main grounding copper busbar in the nacelle and the main grounding ring of the wind turbine.

[0015] In combination with the first aspect, an embodiment of the present invention provides a second possible implementation manner of the first aspect, wherein determining the lightning protection grounding cross-section parameter according to the location where the cable is applied includes:

[0016] When the cable is used in equipotential bonding, the cross-sectional area is determined as A.

[0017] When the cable is used as a connecting conductor from an equipotential bonding belt to a grounding device or between equipotential bonding belts, different cross-sectional areas are obtained according to different materials.

[0018] When the cable is used as a connecting conductor from a metal device in the house to an equipotential bonding belt, different cross-sectional areas are obtained according to different materials.

[0019] When the cable is used as a conductor to connect a surge protector, different cross-sectional areas are obtained according to different systems and protector specifications.

[0020] In combination with the first aspect, the embodiment of the present invention provides a third possible implementation of the first aspect, which further includes:

[0021] According to the lightning protection grounding cross-sectional parameters, the actual cross-sectional parameters of the single cable component are corrected to ensure that the actual cross-sectional parameters of the single cable component meet both the target parameters and the lightning protection grounding cross-sectional parameters.

[0022] In combination with the first aspect, an embodiment of the present invention provides a fourth possible implementation manner of the first aspect, wherein the determining the number of generator grounding cables and the number of cables between the cabin grounding bar and the grounding ring respectively includes:

[0023] The number of generator grounding cables n=max{n1, n2}, where n1 is the number of grounding cables on the generator stator side, and n2 is the number of grounding cables on the generator rotor side.

[0024] The total number of cables n between the cabin grounding bar and the grounding ring = max{n, n3, n4, ...nm}, where n is the number of generator grounding cables, n3, n4, ...nm is the number of grounding cables of the remaining cabin components, and the value of m is determined by the number of cabin components.

[0025] In a second aspect, an embodiment of the present invention further provides a system for selecting a grounding cable for a wind turbine generator set, comprising:

[0026] The component design module is used to determine the actual cross-sectional parameters of the cable single components for the generator grounding and various components of the nacelle based on the target parameters of the required cables.

[0027] The lightning protection design module is used to determine the lightning protection grounding cross-section parameters according to the location of the cable application.

[0028] The quantity design module is used to determine the number of generator grounding cables and the total number of cables between the cabin grounding bar and the grounding ring.

[0029] In combination with the second aspect, an embodiment of the present invention provides a first possible implementation of the second aspect, wherein the component design module includes:

[0030] The cross-section calculation unit is used to determine the cross-section of the protective conductor according to the cross-section of the phase conductor.

[0031] The root number calculation unit is used to calculate the number of roots of the protective conductor n = the cross-section of the protective conductor / the cross-section of a single conductor. If there is a remainder in the calculation, n is carried forward.

[0032] The length calculation unit is used to calculate the effective length of the cable according to the path between the main grounding copper busbar of the nacelle and the main grounding ring of the wind turbine.

[0033] In combination with the second aspect, an embodiment of the present invention provides a second possible implementation of the second aspect, wherein the lightning protection design module includes:

[0034] The equipotential bonding strip design unit is used to determine the cross-sectional area A when the cable is used in the equipotential bonding strip.

[0035] The first connecting conductor design unit is used to obtain different cross-sectional areas according to different materials when the cable is used as a connecting conductor from an equipotential bonding strip to a grounding device or between equipotential bonding strips.

[0036] The second connecting conductor design unit is used to obtain different cross-sectional areas according to different materials when the cable is used as a connecting conductor from a metal device in a house to an equipotential bonding belt.

[0037] The surge protector conductor design unit is used to obtain different cross-sectional areas according to different systems and protector specifications when the cable is used as a conductor connecting a surge protector.

[0038] In combination with the second aspect, an embodiment of the present invention provides a third possible implementation method of the second aspect, which also includes an optimization module for correcting the actual cross-sectional parameters of a single cable component according to the lightning protection grounding cross-sectional parameters to ensure that the actual cross-sectional parameters of a single cable component simultaneously meet the target parameters and the lightning protection grounding cross-sectional parameters.

[0039] In combination with the second aspect, the embodiment of the present invention provides a fourth possible implementation of the second aspect, wherein the quantity design module includes:

[0040] The generator cable calculation unit is used to calculate the number of generator grounding cables n=max{n1, n2}, where n1 is the number of grounding cables on the stator side of the generator, and n2 is the number of grounding cables on the rotor side of the generator.

[0041] The cabin cable calculation unit is used to calculate the number of cables between the cabin grounding bar and the grounding ring ntotal = max{n, n3, n4, ...nm}, where n is the number of generator grounding cables, n3, n4, ...nm is the number of grounding cables of the remaining cabin components, and the value of m is determined by the number of cabin components.

[0042] The beneficial effects of the embodiments of the present invention are:

[0043] The invention discloses a method and system for selecting a grounding cable for a wind turbine set. Firstly, the grounding cables at different points of main components are optimized to obtain a cable design from the total grounding bar of the component to the total grounding copper bar of the cabin. The grounding cables of different components are designed according to this method. Meanwhile, the lightning protection grounding is also collected to the total grounding copper bar of the cabin. The cable between the total grounding bar of the cabin and the grounding ring is optimized again to obtain the total grounding cable design of the set.

[0044] The method for selecting the grounding cable of the wind turbine generator set of the present invention is simple and easy to design. Starting from the selection of the grounding cable of the component, from the component to the whole, the selection of the grounding cable of the wind turbine generator set as a whole is finally provided. The lightning protection grounding design and the protective grounding design are integrated to provide a unified lightning protection design, which has use value. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0046] Figure 1 This is a flow chart of a method for selecting a grounding cable for a wind turbine generator system according to the present invention;

[0047] Figure 2 The figure is a schematic diagram of the design concept of the method for selecting the grounding cable of the wind turbine generator system of the present invention. DETAILED DESCRIPTION

[0048] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0049] Please refer to Figure 2 The method for selecting the grounding cable of the wind turbine set of the present invention first optimizes the grounding cables at different points of the main components to obtain the cable design from the total grounding bar of the component to the total grounding copper bar of the cabin. The grounding cables of different components are designed according to this method. At the same time, the lightning protection grounding is also collected to the total grounding copper bar of the cabin. The cable between the total grounding bar of the cabin and the grounding ring is optimized again to obtain the total grounding cable design of the unit.

[0050] Please refer to Figure 1 The first embodiment of the present invention provides a method for selecting a grounding cable for a wind turbine generator system, which includes:

[0051] According to the target parameters of the required cables, the cross-sectional parameters of the generator grounding cable and the actual cross-sectional parameters of the cable components of the remaining components of the nacelle are determined.

[0052] Determine the lightning protection grounding cross-section parameters according to the location where the cable is used.

[0053] Determine the number of generator grounding cables and the number of grounding cables for other components on the machine side respectively, and finally determine the total number of cables from the cabin grounding bar to the grounding ring.

[0054] In combination with the first aspect, an embodiment of the present invention provides a first possible implementation manner of the first aspect, wherein determining the generator grounding cable cross-sectional parameters and the actual grounding cable cross-sectional parameters of the cable single components of the remaining components of the nacelle according to the target parameters of the required cable includes:

[0055] Determine the cross-section of the protective conductor based on the cross-section of the phase conductor.

[0056] Calculate the number of protective conductors n = protective conductor cross-section / single conductor cross-section. If there is a remainder, round up the number n.

[0057] Calculate the effective length of the cable based on the path between the main grounding copper busbar in the nacelle and the main grounding ring of the wind turbine.

[0058] In combination with the first aspect, an embodiment of the present invention provides a second possible implementation manner of the first aspect, wherein determining the lightning protection grounding cross-section parameter according to the location where the cable is applied includes:

[0059] When the cable is used for equipotential bonding (using copper or iron materials), the cross-sectional area is determined to be 50mm 2 .

[0060] When the cable is used as a connecting conductor from the equipotential bonding belt to the grounding device or between equipotential bonding belts, different cross-sectional areas are obtained according to different materials. When copper material is used, the cross-sectional area is 16mm 2 When aluminum is used, the cross-sectional area is 25 mm 2 When iron material is used, the cross-sectional area is 50mm 2 .

[0061] When the cable is used as a connecting conductor from a metal device in the house to an equipotential bonding strip, different cross-sectional areas are obtained according to different materials. When copper material is used, the cross-sectional area is 6mm 2 When aluminum is used, the cross-sectional area is 10 mm 2 When iron material is used, the cross-sectional area is 16mm 2 .

[0062] When the cable is used as a conductor to connect a surge protector (using copper material), different cross-sectional areas are obtained according to different systems and protector specifications. When used in surge protectors for electrical system level I experiments, the cross-sectional area is 6mm 2 When used in surge protectors for electrical system level II experiments, the cross-sectional area is 2.5mm 2 When used in surge protectors for electrical system level III experiments, the cross-sectional area is 1.5 mm 2 , when used in electronic system DI type surge protector, the cross-sectional area is 1.2mm 2 When used in other protectors of electronic systems, the cross-sectional area can be less than 1.2mm depending on the situation. 2 .

[0063] In combination with the first aspect, the embodiment of the present invention provides a third possible implementation of the first aspect, which further includes:

[0064] According to the lightning protection grounding cross-sectional parameters, the actual cross-sectional parameters of the single cable component are corrected to ensure that the actual cross-sectional parameters of the single cable component meet both the target parameters and the lightning protection grounding cross-sectional parameters.

[0065] In combination with the first aspect, an embodiment of the present invention provides a fourth possible implementation manner of the first aspect, wherein the determining the number of generator grounding cables and the total number of cables between the cabin grounding bar and the grounding ring respectively includes:

[0066] The number of generator grounding cables n=max{n1, n2}, where n1 is the number of grounding cables on the generator stator side, and n2 is the number of grounding cables on the generator rotor side.

[0067] The total number of cables n between the cabin grounding bar and the grounding ring = max{n, n3, n4, ...nm}, where n is the number of grounding cables of the generator, n3, n4, ...nm is the number of grounding cables of each cabin component, and the value of m is determined by the number of each cabin component.

[0068] A second embodiment of the present invention provides a system for selecting a grounding cable for a wind turbine generator system, comprising:

[0069] The component design module is used to determine the actual cross-sectional parameters of the cable single components for the generator grounding and various components of the nacelle based on the target parameters of the required cables.

[0070] The lightning protection design module is used to determine the lightning protection grounding cross-section parameters according to the location of the cable application.

[0071] The quantity design module is used to determine the number of generator grounding cables and the total number of cables between the cabin grounding bar and the grounding ring.

[0072] In combination with the second aspect, an embodiment of the present invention provides a first possible implementation of the second aspect, wherein the component design module includes:

[0073] The cross-section calculation unit is used to determine the cross-section of the protective conductor according to the cross-section of the phase conductor.

[0074] The root number calculation unit is used to calculate the number of roots of the protective conductor n = the cross-section of the protective conductor / the cross-section of a single conductor. If there is a remainder in the calculation, n is carried forward.

[0075] The length calculation unit is used to calculate the effective length of the cable according to the path between the main grounding copper busbar of the nacelle and the main grounding ring of the wind turbine.

[0076] In combination with the second aspect, an embodiment of the present invention provides a second possible implementation of the second aspect, wherein the lightning protection design module includes:

[0077] Equipotential bonding strip design unit, used when the cable is used in equipotential bonding strip (using copper or iron material), to determine the cross-sectional area of ​​50mm 2 .

[0078] The first connecting conductor design unit is used when the cable is used as a connecting conductor from the equipotential bonding belt to the grounding device or between equipotential bonding belts, and different cross-sectional areas are obtained according to different materials. When copper material is used, the cross-sectional area is 16mm 2 When aluminum is used, the cross-sectional area is 25 mm 2 When iron material is used, the cross-sectional area is 50mm 2 .

[0079] The second connecting conductor design unit is used when the cable is used as a connecting conductor from a metal device in the house to an equipotential bonding belt, and different cross-sectional areas are obtained according to different materials. When copper material is used, the cross-sectional area is 6mm 2 When aluminum is used, the cross-sectional area is 10 mm 2 When iron material is used, the cross-sectional area is 16mm 2 .

[0080] Surge protector conductor design unit, used when the cable is used to connect the conductor of the surge protector (using copper material), different cross-sectional areas are obtained according to different systems and protector specifications. When used for surge protectors in electrical system level I experiments, the cross-sectional area is 6mm 2 When used in surge protectors for electrical system level II experiments, the cross-sectional area is 2.5mm 2 When used in surge protectors for electrical system level III experiments, the cross-sectional area is 1.5 mm 2 , when used in electronic system DI type surge protector, the cross-sectional area is 1.2mm 2 When used in other protectors of electronic systems, the cross-sectional area can be less than 1.2mm depending on the situation. 2 .

[0081] In combination with the second aspect, an embodiment of the present invention provides a third possible implementation method of the second aspect, which also includes an optimization module for correcting the actual cross-sectional parameters of a single cable component according to the lightning protection grounding cross-sectional parameters to ensure that the actual cross-sectional parameters of a single cable component simultaneously meet the target parameters and the lightning protection grounding cross-sectional parameters.

[0082] In combination with the second aspect, the embodiment of the present invention provides a fourth possible implementation of the second aspect, wherein the quantity design module includes:

[0083] The generator cable calculation unit is used to calculate the number of generator grounding cables n=max{n1, n2}, where n1 is the number of grounding cables on the stator side of the generator, and n2 is the number of grounding cables on the rotor side of the generator.

[0084] The cabin cable calculation unit is used to calculate the number of cables between the cabin grounding bar and the grounding ring ntotal = max{n, n3, n4, ...nm}, where n is the number of grounding cables of the generator, n3, n4, ...nm is the number of grounding cables of each component in the cabin, and the value of m is determined by the number of each component in the cabin.

[0085] The embodiment of the present invention aims to protect a method and system for selecting a grounding cable for a wind turbine generator set, and has the following effects:

[0086] 1. The method for selecting the grounding cable for the wind turbine generator system of the present invention is simple and easy to design.

[0087] 2. Starting from the selection of component grounding cables, from components to the whole, finally providing the selection of grounding cables for the whole wind turbine.

[0088] 3. Integrate lightning protection grounding design and protective grounding design to provide a unified lightning protection design with practical value.

[0089] The computer program product of the method and device for selecting the grounding cable of a wind turbine provided in the embodiment of the present invention includes a computer-readable storage medium storing program code. The instructions included in the program code can be used to execute the method in the previous method embodiment. The specific implementation can be found in the method embodiment and will not be repeated here.

[0090] Specifically, the storage medium can be a general storage medium, such as a mobile disk, a hard disk, etc. When the computer program on the storage medium is run, it can execute the above-mentioned wind turbine grounding cable selection method, thereby meeting the design requirements of the grounding cable during normal operation and meeting the economic needs.

[0091] If the functions are implemented in the form of software functional units and sold or used as independent products, they can be stored in a non-volatile computer-readable storage medium that is executable by a processor. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art or the part of the technical solution, can be embodied in the form of a software product. The computer software product is stored in a storage medium, including several instructions for enabling a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present invention. The aforementioned storage medium includes: various media that can store program codes, such as a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk.

[0092] Finally, it should be noted that the above-described embodiments are only specific implementations of the present invention, which are used to illustrate the technical solutions of the present invention, rather than to limit them. The protection scope of the present invention is not limited thereto. Although the present invention is described in detail with reference to the above-described embodiments, ordinary technicians in the field should understand that any technician familiar with the technical field can still modify the technical solutions recorded in the above-described embodiments within the technical scope disclosed by the present invention, or can easily think of changes, or make equivalent replacements for some of the technical features therein; and these modifications, changes or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be based on the protection scope of the claims.

Claims

1. A method for selecting a grounding cable for a wind turbine generator system, characterized in that: include: Determine the actual grounding cable cross-sectional parameters of the generator grounding and the cables for the remaining components of the nacelle according to the target parameters of the required cables; Determine the lightning protection grounding cross-section parameters according to the location where the cable is used; Determine the number of generator grounding cables and the total number of cables between the cabin grounding bar and the grounding ring respectively; Determining the actual grounding cable cross-sectional parameters of the single cable components for the generator grounding and other components of the nacelle according to the target parameters of the required cables includes: Determine the cross section of the protective conductor according to the cross section of the phase conductor; Calculate the number of protective conductors n = protective conductor cross section / single conductor cross section. If there is a remainder, n is rounded up; Calculate the effective length of the cable based on the path between the main grounding copper busbar in the nacelle and the main grounding ring of the wind turbine; Determining the lightning protection grounding cross-section parameters according to the cable application location includes: When the cable is used in equipotential bonding, the cross-sectional area is determined as A; When the cable is used as a connecting conductor from an equipotential bonding belt to a grounding device or between equipotential bonding belts, different cross-sectional areas are obtained according to different materials; When the cable is used as a connecting conductor from a metal device in the house to an equipotential bonding strip, different cross-sectional areas are obtained according to different materials; When the cable is used to connect the conductor of the surge protector, different cross-sectional areas are obtained according to different systems and protector specifications; The method of respectively determining the number of generator grounding cables and the total number of cables between the cabin grounding bar and the grounding ring comprises: The number of generator grounding cables n = max{n1, n2}, where n1 is the number of grounding cables on the generator stator side, and n2 is the number of grounding cables on the generator rotor side; The total number of cables n between the cabin grounding bar and the grounding ring = max{n, n3, n4, ...nm}, where n is the number of generator grounding cables; n3, n4, ...nm is the number of grounding cables of each cabin component, and the value of m is determined by the number of each cabin component.

2. The method for selecting a grounding cable for a wind turbine generator system according to claim 1, characterized in that: Also includes: According to the lightning protection grounding cross-sectional parameters, the actual cross-sectional parameters of the single cable component are corrected to ensure that the actual cross-sectional parameters of the single cable component meet both the target parameters and the lightning protection grounding cross-sectional parameters.

3. A system for selecting a grounding cable for a wind turbine generator using the method for selecting a grounding cable for a wind turbine generator according to any one of claims 1 to 2, characterized in that: include: A component design module for determining the actual grounding cable cross-sectional parameters of the cable single components for the generator grounding and the remaining components of the nacelle according to the target parameters of the required cables; Lightning protection design module, used to determine the lightning protection grounding cross-section parameters according to the cable application location; The quantity design module is used to determine the number of generator grounding cables and the total number of cables between the cabin grounding bar and the grounding ring.

4. The wind turbine grounding cable selection system according to claim 3, characterized in that: The component design module includes: A cross-section calculation unit, used to determine the cross-section of the protective conductor according to the cross-section of the phase conductor; The root number calculation unit is used to calculate the number of protective conductors n = protective conductor cross section / single conductor cross section. If there is a remainder in the calculation, n is carried; The length calculation unit is used to calculate the effective length of the cable according to the path between the main grounding copper busbar of the nacelle and the main grounding ring of the wind turbine.

5. The wind turbine grounding cable selection system according to claim 4, characterized in that: The lightning protection design module includes: The equipotential bonding strip design unit is used to determine the cross-sectional area A when the cable is used in the equipotential bonding strip; The first connecting conductor design unit is used to obtain different cross-sectional areas according to different materials when the cable is used as a connecting conductor from an equipotential bonding belt to a grounding device or between equipotential bonding belts; The second connecting conductor design unit is used to obtain different cross-sectional areas according to different materials when the cable is used as a connecting conductor from a metal device in the house to an equipotential bonding belt; The surge protector conductor design unit is used to obtain different cross-sectional areas according to different systems and protector specifications when the cable is used as a conductor connecting a surge protector.

6. The wind turbine grounding cable selection system according to claim 5, characterized in that: It also includes an optimization module for correcting the actual cross-sectional parameters of a single cable component according to the lightning protection grounding cross-sectional parameters, so as to ensure that the actual cross-sectional parameters of a single cable component simultaneously meet the target parameters and the lightning protection grounding cross-sectional parameters.

7. The wind turbine grounding cable selection system according to claim 6, characterized in that: The quantity design module includes: The generator cable calculation unit is used to calculate the number of generator grounding cables n=max{n1,n2}, where n1 is the number of grounding cables on the stator side of the generator, and n2 is the number of grounding cables on the rotor side of the generator; Cabin cable calculation unit, used to calculate the number of cables n between the cabin grounding bar and the grounding ring 总 =max{n, n3, n4, …nm}, where n is the number of generator grounding cables, n3, n4, …nm are the number of grounding cables of the remaining components in the nacelle, and the value of m is determined by the number of components in the nacelle.

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