Fan base assembly, construction method for fan base and wind power plant

Abstract

The invention discloses a draught fan base assembly, a construction method for a draught fan base and a wind power plant. The draught fan base assembly comprises the draught fan base, a grounding piece and a resistance reducing layer, the draught fan base is arranged on a base body, and the draught fan base is suitable for installing a draught fan for wind power generation; the grounding piece is connected with the fan base, and a drainage groove for containing the grounding piece is formed in the base body; the resistance reducing layer wraps at least part of the periphery of the grounding piece and is filled in the drainage groove. According to the fan base assembly, efficient grounding and electrical protection are achieved, grounding resistance is effectively reduced, and safety and stability in electrical events such as thunder and lightning are improved.

Description

Technical Field

[0001] This invention relates to the field of wind power, and in particular to a wind turbine base assembly, a construction method for the wind turbine base, and a wind farm. Background Technology

[0002] The construction of wind farms in high-altitude areas has become an important means to improve the utilization efficiency of wind energy resources and optimize the energy structure in mountainous regions. However, the complex geological conditions and harsh climate of high-altitude areas pose severe challenges to the construction and operation of wind farms.

[0003] In high-altitude areas, exposed bedrock and extensive rock formations result in generally high soil resistivity, typically exceeding 2000 Ω·m. This makes it difficult for wind turbine grounding resistance to meet the 4-ohm standard requirement. The limited area of ​​the turbine platforms located on mountaintops, often situated on cliff edges, further complicates grounding grid design. Traditional grounding grid design methods, such as expanding the grounding grid, often fail to effectively reduce grounding resistance in environments with high soil resistivity, leading to significant discrepancies between calculated and standard requirements.

[0004] In environments with high soil resistivity, excessive grounding resistance not only prevents equipment from effectively discharging current when struck by lightning, increasing the risk of equipment damage, but also affects the overall lightning protection performance of the wind farm, threatening its stable operation. Summary of the Invention

[0005] This invention aims to at least solve one of the technical problems existing in the prior art. Therefore, one object of this invention is to provide a wind turbine base assembly. According to the wind turbine base assembly of this invention, efficient grounding and electrical protection are achieved, effectively reducing grounding resistance and improving safety and stability in electrical events such as lightning strikes.

[0006] The present invention also proposes a construction method for the above-mentioned wind turbine base.

[0007] The present invention also proposes a wind farm having the above-mentioned wind turbine base assembly.

[0008] The wind turbine base assembly according to the present invention includes: a wind turbine base disposed on a base body and adapted to mount a wind turbine for wind power generation; a grounding member connected to the wind turbine base, wherein a drain groove for receiving the grounding member is formed on the base body; and a resistance-reducing layer covering at least a portion of the outer periphery of the grounding member and filling the drain groove.

[0009] According to the wind turbine base assembly of the present invention, a wind turbine base is provided, the assembly being mounted on a substrate, such as the earth's foundation structure, and the base is suitable for mounting a wind turbine for wind power generation, supporting the turbine and maintaining its stable operation. A grounding element is provided, connected to the wind turbine base, to provide an electrical connection to the earth, enabling rapid current diversion into the substrate during electrical events such as lightning strikes, protecting the wind power equipment from damage. The grounding element ensures a secure and reliable connection to the wind turbine base while effectively reducing grounding resistance. A drainage groove is provided on the substrate, within which the grounding element is located, providing space for the grounding element and increasing its grounding area, thereby enhancing the grounding effect. The shape and size of the drainage groove can be designed and adjusted according to actual site conditions to optimize grounding performance. A resistance-reducing layer is provided, covering at least a portion of the outer periphery of the grounding element and filling the drainage groove. The main function of the resistance-reducing layer is to reduce soil resistivity through its special material or structure, further reducing grounding resistance. The resistivity-reducing layer can be made of soil with low resistivity, resistivity-reducing agent or other suitable materials, which can effectively improve the grounding effect.

[0010] According to some embodiments of the present invention, the grounding element includes: a grounding grid laid in the drainage channel; and a vertical ground electrode connected to the grounding grid and extending into the soil in the depth direction of the drainage channel; wherein the grounding grid is horizontally arranged and composed of flat steel bars with a width of d1 and a thickness of h arranged in an alternating pattern, and satisfies: 30mm≤d1≤70mm, 3mm≤h≤10mm.

[0011] According to some embodiments of the present invention, the bleed channel includes: a bleed pit, in which the grounding grid is disposed; and a grounding trench, which is disposed between the bleed pit and the fan base; wherein the grounding component further includes a grounding body, which is housed in the grounding trench and connects the fan base to the grounding grid, and the grounding trench is filled with the resistance-reducing layer, which covers the outer periphery of the grounding body.

[0012] According to some embodiments of the present invention, the grounding elements are constructed as a plurality of units connected in parallel with each other.

[0013] According to some embodiments of the present invention, the drag-reducing layer is filled with a drag-reducing agent or a mixture of clay and drag-reducing agent.

[0014] The following describes a construction method for a wind turbine base according to an embodiment of the present invention.

[0015] The construction method according to the present invention is used for the wind turbine base described in any of the above embodiments. The construction method includes: designing the dimensions of the spillway based on the resistivity of the original stratum around the wind turbine base, the resistivity of the replaced stratum, and the volume of the grounding element; excavating the spillway and then laying the grounding element inside the spillway and filling the outer periphery of the grounding element with a resistance-reducing layer. Before construction, the dimensions of the spillway need to be designed based on the resistivity of the original stratum around the wind turbine base, the resistivity of the replaced stratum, and the volume of the grounding element. Stratum resistivity is a measure of the degree to which soil impedes the passage of current, while the replaced stratum resistivity refers to the resistivity of the material used to replace the original soil during excavation and filling. The volume of the grounding element determines how much space is needed to accommodate it. Designing the dimensions of the spillway ensures that it can effectively accommodate the grounding element and form a low-resistivity grounding path to effectively conduct current into the earth. After the design phase is completed, the construction team excavates the spillway according to the designed dimensions. After the spillway is excavated, the construction team lays the grounding element inside the trench. After the grounding components are laid, the construction team will fill the outer perimeter of the grounding components with a resistance-reducing layer. This layer reduces soil resistivity, thereby improving the grounding effect. The resistance-reducing layer tightly covers the outer perimeter of the grounding components, ensuring a good electrical connection between the grounding components and the soil.

[0016] According to some embodiments of the present invention, the design of the dimensions of the bleed channel based on the resistivity of the original stratum, the resistivity of the replaced stratum, and the volume of the grounding element around the outer periphery of the wind turbine base includes: measuring the resistivity ρy of the original stratum, the resistivity ρz of the resistance-reducing layer, measuring the length L of the grounding element, the equivalent diameter d1 of the grounding element, and calculating the diameter d, and calculating the resistance value R of the bleed channel according to R=ρy / (2πL)×ln(2L / d1)+ρz / (2πL)×ln(L / d); and calculating the dimensions of the bleed channel based on the target resistance value and the resistance value R.

[0017] According to some embodiments of the present invention, the bleed channel consists of a grounding trench and a bleed pit. After determining the size of a bleed pit, the resistance value in a single bleed pit is calculated, and the number of bleed pits required is calculated based on the target resistance value.

[0018] According to some embodiments of the present invention, the construction method further includes: excavating a grounding trench and a spillway pit, wherein the grounding trench connects the spillway pit to the wind turbine base and connects two adjacent spillway pits; after excavation, a drag-reducing layer is filled and further backfilled.

[0019] The following describes a wind farm according to an embodiment of the present invention.

[0020] The wind farm according to the present invention is equipped with multiple wind turbines, each wind turbine mounted on a wind turbine base assembly, the wind turbine base assembly being constructed as described in any of the above embodiments; wherein, the grounding member connects at least two adjacent wind turbine bases. Each wind turbine is mounted on a wind turbine base assembly. The wind turbine base assembly can support the wind turbine and provide the necessary stability, enabling the wind turbine to operate safely and stably even under harsh weather conditions. By constructing the wind turbine base assembly as described in any of the above embodiments, the wind farm can ensure the safety and stability of the equipment while guaranteeing efficient power generation. Even in harsh electrical environments, the wind farm can effectively avoid electrical disasters and ensure the long-term stable operation of wind power equipment. By connecting at least two adjacent wind turbine bases with a grounding member, the grounding member can achieve electrical connection between the wind turbine bases, forming a continuous electrical path, which helps to safely conduct current or charge into the base during electrical events such as lightning strikes, avoiding damage to the wind turbine or other equipment.

[0021] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0022] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0023] Figure 1 This is a schematic diagram of a wind turbine base assembly according to an embodiment of the present invention;

[0024] Figure 2 This is a schematic diagram of the arrangement of grounding components in the drain pit of a wind turbine base assembly according to an embodiment of the present invention;

[0025] Figure 3 This is a cross-sectional schematic diagram of the drainage channel of a wind turbine base assembly according to an embodiment of the present invention.

[0026] Figure 4 This is a cross-sectional schematic diagram of the grounding trench of a wind turbine base assembly according to an embodiment of the present invention;

[0027] Figure 5 This is a cross-sectional schematic diagram of the grounding trench of a wind turbine base assembly according to another embodiment of the present invention;

[0028] Figure 6 This is a flowchart of a construction method for a wind turbine base according to an embodiment of the present invention.

[0029] Figure label:

[0030] Wind turbine base assembly 1;

[0031] Wind turbine base 11;

[0032] 12 spillway, 121 spillway pit, 122 grounding trench;

[0033] Grounding component 13, grounding grid 131, vertical ground electrode 132, grounding body 133;

[0034] Resistance-reducing layer 14, backfill layer 15. Detailed Implementation

[0035] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0036] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, features defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0037] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0038] In related technologies, traditional grounding grid design methods such as extended grounding grids often fail to effectively reduce grounding resistance in environments with high soil resistivity, resulting in a significant discrepancy between the calculated grounding resistance value and the specifications.

[0039] The following is for reference. Figures 1-5 A wind turbine base assembly 1 is described according to an embodiment of the present invention.

[0040] like Figures 1-5 As shown, the wind turbine base assembly 1 according to the present invention includes a wind turbine base 11, a grounding member 13, and a resistance-reducing layer 14. The wind turbine base 11 is disposed on a substrate and is adapted to install a wind turbine for wind power generation. The grounding member 13 is connected to the wind turbine base 11, and a drain groove 12 for receiving the grounding member 13 is formed on the substrate. The resistance-reducing layer 14 covers at least a portion of the outer periphery of the grounding member 13 and fills the drain groove 12.

[0041] According to the wind turbine base assembly 1 of the present invention, a wind turbine base 11 is provided, which is mounted on a base, such as the foundation structure of the earth. The wind turbine base 11 is suitable for mounting a wind turbine for wind power generation, supporting the wind turbine and maintaining its stable operation. A grounding element 13 is provided, connected to the wind turbine base 11, to provide an electrical connection with the earth. This allows current to be quickly conducted into the base in the event of electrical events such as lightning strikes, protecting the wind power equipment from damage. The grounding element 13 ensures a secure and reliable connection with the wind turbine base 11 while effectively reducing grounding resistance. A drain groove 12 is provided on the base, within which the grounding element 13 is disposed. The drain groove 12 provides space for the grounding element 13, increasing its grounding area and thus enhancing the grounding effect. The shape and size of the drain groove 12 can be designed and adjusted according to actual site conditions to optimize grounding performance. By setting a resistance-reducing layer 14, which covers at least a portion of the outer periphery of the grounding element 13 and fills the drain groove 12, the main function of the resistance-reducing layer 14 is to reduce the soil resistivity through its special material or structure, thereby further reducing the grounding resistance. The resistance-reducing layer 14 can be made of soil with low resistivity, resistance-reducing agent, or other suitable materials, which can effectively improve the grounding effect.

[0042] Therefore, the wind turbine base assembly 1 according to the present invention achieves efficient grounding and electrical protection, effectively reduces grounding resistance, and improves safety and stability in electrical events such as lightning.

[0043] According to some embodiments of the present invention, such as Figure 2As shown, the grounding component 13 includes a grounding grid 131 and a vertical ground electrode 132. The grounding grid 131 is laid within the drainage channel 12. The vertical ground electrode 132 is connected to the grounding grid 131 and extends into the soil along the depth direction of the drainage channel 12. The grounding grid 131 is horizontally arranged and consists of flat steel bars of width d1 and thickness h arranged in an alternating pattern, satisfying the following conditions: 30mm≤d1≤70mm, 3mm≤h≤10mm. By setting the grounding grid 131, which is a network structure composed of multiple conductive materials, the grounding grid 131, laid within the drainage channel 12, increases the grounding area, thereby enhancing the grounding effect and more effectively guiding current into the earth. By setting the vertical ground electrode 132, a conductor extending into the soil along the depth direction of the drainage channel 12, the vertical ground electrode 132 is connected to the grounding grid 131 to provide a deeper grounding path, helping to ensure that current can flow into the earth more effectively. The width of the flat steel of the grounding grid 131 is between 30mm and 70mm, and the thickness of the flat steel is between 3mm and 10mm. This ensures conductivity and grounding effect while also taking into account economy and construction efficiency.

[0044] According to some embodiments of the present invention, such as Figures 1-5 As shown, the effluent channel 12 includes an effluent pit 121 and a grounding trench 122. A grounding grid 131 is provided within the effluent pit 121. The grounding trench 122 is located between the effluent pit 121 and the fan base 11. The grounding component 13 also includes a grounding body 133, which is housed within the grounding trench 122 and connects the fan base 11 to the grounding grid 131. A resistance-reducing layer 14 is filled within the grounding trench 122, covering the outer periphery of the grounding body 133. By providing the effluent pit 121, which contains the grounding grid 131, a network structure composed of alternating conductive materials (such as flat steel), the grounding area is increased, improving the grounding effect. By providing the grounding trench 122, located between the effluent pit 121 and the fan base 11, a path is provided for the grounding body 133 from the fan base 11 to the grounding grid 131 within the effluent pit 121. By setting a grounding electrode 133, which is a conductor connecting the wind turbine base 11 and the grounding grid 131 within the spillway 121, and housed within a grounding trench 122, current can smoothly flow from the wind turbine base 11 into the grounding grid 131 and then into the earth. By filling the grounding trench 122 with a resistance-reducing layer 14, which covers the outer periphery of the grounding electrode 133, the soil resistivity around the grounding electrode 133 can be reduced, further improving the grounding effect. Furthermore, when there are multiple spillway 121s, the grounding trench 122 can also be used to connect adjacent spillway 121s, providing a path for current from the spillway 121 to the wind turbine base 11 or from one spillway 121 to another.

[0045] According to some embodiments of the present invention, such as Figure 1 As shown, multiple grounding elements 13 are configured to be connected in parallel. By configuring multiple grounding elements 13 to be connected in parallel, the current is distributed through each parallel grounding element 13, thereby achieving a more uniform current distribution and a more efficient grounding effect. The parallel grounding elements 13 can share the current load, effectively reducing the current density on each grounding element 13, allowing the current to be conducted to the ground more efficiently.

[0046] According to some embodiments of the present invention, the resistance-reducing layer 14 is filled with a resistance-reducing agent. The resistance-reducing agent has properties such as reducing soil resistivity and increasing the effective cross-sectional area of ​​the grounding electrode 133. When the resistance-reducing agent covers the outer periphery of the grounding electrode 13, it can mix with the soil and diffuse and permeate, thereby reducing the soil resistivity around the grounding electrode 13. Furthermore, the resistance-reducing agent itself has very low resistivity; after being filled around the grounding electrode 13, it effectively increases the effective cross-sectional area of ​​the grounding electrode, which also helps to reduce the grounding resistance.

[0047] According to some embodiments of the present invention, the resistivity-reducing layer 14 is filled with a mixture of clay and a resistivity-reducing agent. To further improve the resistivity-reducing effect or adapt to specific soil conditions, a mixture of clay and a resistivity-reducing agent may be used to fill the resistivity-reducing layer 14. Clay has good water and fertilizer retention capacity and low air permeability. When clay is mixed with a resistivity-reducing agent, a resistivity-reducing material with more stable performance and better conductivity can be formed, which can more effectively reduce soil resistivity and improve the performance and stability of the grounding system.

[0048] The following is for reference. Figure 6 A construction method for a wind turbine base 11 according to an embodiment of the present invention is described.

[0049] like Figure 6As shown, the construction method according to the present invention is used for the wind turbine base 11 in any of the above embodiments. The construction method includes: designing the dimensions of the drainage channel 12 based on the original resistivity of the stratum around the wind turbine base 11, the resistivity of the replaced stratum, and the volume of the grounding element 13; after excavating the drainage channel 12, laying the grounding element 13 inside the drainage channel 12 and filling the outer periphery of the grounding element 13 with a resistance-reducing layer 14. Before construction, the dimensions of the drainage channel 12 need to be designed based on the original resistivity of the stratum around the wind turbine base 11, the resistivity of the replaced stratum, and the volume of the grounding element 13. Stratum resistivity is a measure of the degree to which soil impedes the passage of current, while the replaced stratum resistivity refers to the resistivity of the material used to replace the original soil during excavation and filling. The volume of the grounding element 13 determines how much space is needed to accommodate the grounding element 13. Designing the dimensions of the drainage channel 12 ensures that it can effectively accommodate the grounding element 13 and form a low-resistivity grounding path so that the current can be effectively conducted into the ground. After the design phase is completed, the construction team will excavate the drainage channel 12 according to the designed dimensions. Once the drainage channel 12 is excavated, the construction team will lay grounding components 13 within the channel. After the grounding components 13 are laid, the construction team will fill the outer periphery of the grounding components 13 with a resistance-reducing layer 14. The resistance-reducing layer 14 reduces soil resistivity, thereby improving the grounding effect. The resistance-reducing layer 14 tightly covers the outer periphery of the grounding components 13, ensuring a good electrical connection between the grounding components 13 and the soil.

[0050] According to some embodiments of the present invention, the design of the dimensions of the overflow channel 12 based on the resistivity of the original soil layer, the resistivity of the replaced soil layer, and the volume of the grounding element 13 around the wind turbine base 11 includes: measuring the resistivity ρy of the original soil layer, the resistivity ρz of the resistance-reducing layer 14, measuring the length L of the grounding element 13, the equivalent diameter d1 of the grounding element 13, and the calculated diameter d, and calculating the resistance value R of the overflow channel 12 according to R=ρy / (2πL)×ln(2L / d1)+ρz / (2πL)×ln(L / d); and calculating the dimensions of the overflow channel 12 based on the target resistance value and the resistance value R. The resistivity ρy of the original soil layer is the resistivity of the original soil around the wind turbine base 11, reflecting the degree of obstruction of the soil to the passage of current. The resistivity ρz of the replaced soil layer is the resistivity of the material of the resistance-reducing layer 14 used to fill the overflow channel 12. The length L of the grounding element 13 is the length of the grounding element 13, which determines the length of contact between the grounding element 13 and the soil. The equivalent diameter d1 and calculated diameter d of grounding component 13 are used for resistance calculation, and the measurement method is as follows: Figure 4 As shown. The target resistance value is the desired grounding resistance value. Based on the target resistance value and the calculated resistance value R, the dimensions of the drain trough 12 can be determined to achieve the target resistance value.

[0051] According to some embodiments of the present invention, the bleed channel 12 consists of a grounding trench 122 and a bleed pit 121. After determining the size of a bleed pit 121, the resistance value of a single bleed pit 121 is calculated, and the required number of bleed pits 121 is calculated based on the target resistance value. At the beginning of the design phase, the size of a bleed pit 121 is first determined, and the size of the bleed pit 121 is determined according to the actual site conditions. After determining the size of the bleed pit 121, the resistance value of a single bleed pit 121 is calculated. Finally, based on the given target resistance value, the number of bleed pits 121 required to achieve the target resistance value can be calculated.

[0052] According to some embodiments of the present invention, the construction method further includes: excavating a grounding trench 122 and a drain pit 121, wherein the grounding trench 122 connects the drain pit 121 to the wind turbine base 11 and connects two adjacent drain pits 121; after excavation, a resistance-reducing layer 14 is filled and further backfilled. After determining the size, number, and arrangement of the drain pits 121, the grounding trench 122 and the drain pits 121 are excavated. The drain pits 121 are used to collect and dissipate current or charge. The grounding trench 122 is used to connect the drain pits 121 to the wind turbine base 11 and adjacent drain pits 121 to provide a path for current from the drain pits 121 to the wind turbine base 11 or from one drain pit 121 to another. After excavation, a resistance-reducing layer 14 needs to be filled into the grounding trench 122 and the drain pits 121. The resistance-reducing layer 14 has a low resistivity, which can effectively reduce the grounding resistance and improve the conductivity of the system. By filling the resistance-reducing layer 14, current can flow into the substrate more quickly, improving safety. After filling the resistance-reducing layer 14, backfilling is required to form the backfill layer 15. The backfill material for the backfill layer 15 can be soil or other suitable materials to restore the original state of the ground.

[0053] The following describes a wind farm according to an embodiment of the present invention.

[0054] According to the present invention, a wind farm is provided with multiple wind turbines, each wind turbine mounted on a wind turbine base assembly 1. The wind turbine base assembly 1 is constructed as described in any of the above embodiments; wherein, a grounding member 13 connects at least two adjacent wind turbine bases 11. The wind farm is provided with multiple wind turbines. The wind turbines are used to convert wind energy into electrical energy. Each wind turbine is mounted on a wind turbine base assembly 1. The wind turbine base assembly 1 can support the wind turbine and provide the necessary stability, enabling the wind turbine to operate safely and stably even under adverse weather conditions. By constructing the wind turbine base assembly 1 as described in any of the above embodiments, the wind farm can ensure the safety and stability of the equipment while guaranteeing efficient power generation. Even in harsh electrical environments, the wind farm can effectively avoid electrical disasters and ensure the long-term stable operation of the wind power equipment. By connecting at least two adjacent wind turbine bases 11 with a grounding element 13, the grounding element 13 can realize the electrical connection between the wind turbine bases 11, forming a continuous electrical path. This helps to safely conduct current or charge into the base in the event of electrical events such as lightning, avoiding damage to the wind turbine or other equipment.

[0055] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0056] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A wind turbine base assembly, characterized in that, include: A wind turbine base (11) is disposed on a base and the wind turbine base (11) is adapted to install a wind turbine for wind power generation; Grounding component (13), the grounding component (13) is connected to the fan base (11), and a drain groove (12) for receiving the grounding component (13) is formed on the base; A resistance-reducing layer (14) is provided, which covers at least a portion of the outer periphery of the grounding member (13) and fills the drain groove (12).

2. The wind turbine base assembly according to claim 1, characterized in that, The grounding element (13) includes: A grounding grid (131) is laid inside the drain trough (12); A vertical ground electrode (132) is connected to the grounding grid (131) and extends into the soil along the depth direction of the drainage channel (12); wherein The grounding grid (131) is arranged horizontally and is composed of flat steel bars with a width of d1 and a thickness of h arranged in an alternating pattern, and satisfies the following conditions: 30mm≤d1≤70mm, 3mm≤h≤10mm.

3. The wind turbine base assembly according to claim 2, characterized in that, The overflow channel (12) includes: A drainage pit (121) is provided with the grounding grid (131) inside the drainage pit (121); A grounding trench (122) is provided between the drain pit (121) and the fan base (11); wherein The grounding component (13) further includes a grounding body (133), which is housed in the grounding trench (122) and connects the wind turbine base (11) to the grounding grid (131). The grounding trench (122) is filled with the resistance-reducing layer (14), which covers the outer periphery of the grounding body (133).

4. The wind turbine base assembly according to claim 3, characterized in that, The grounding element (13) is constructed as a plurality of units connected in parallel to each other.

5. The wind turbine base assembly according to claim 3, characterized in that, The drag-reducing layer (14) is filled with a drag-reducing agent or a mixture of clay and drag-reducing agent.

6. A construction method for a wind turbine base (11), wherein the wind turbine base (11) is constructed as described in any one of claims 1-5, characterized in that, include: The dimensions of the drain trough (12) are designed based on the original resistivity and the replaced resistivity of the outer periphery of the wind turbine base (11) and the volume of the grounding component (13). After excavating the drainage channel (12), a grounding component (13) is laid inside the drainage channel (12) and a resistance-reducing layer (14) is filled to the outer periphery of the grounding component (13).

7. The construction method according to claim 6, characterized in that, The dimensions of the drain trough (12) are designed based on the original stratum resistivity, the replaced stratum resistivity, and the volume of the grounding element (13) around the outer periphery of the wind turbine base (11). The resistivity ρy of the original stratum and the resistivity ρz of the resistance-reducing layer (14) are measured. The length L of the grounding component (13), the equivalent diameter d1 of the grounding component (13) and the calculated diameter d are measured. The resistance value R of the discharge channel (12) is calculated according to R=ρy / (2πL)×ln(2L / d1)+ρz / (2πL)×ln(L / d). The dimensions of the bleed channel (12) are calculated based on the target resistance value and the resistance value R.

8. The construction method according to claim 7, characterized in that, The drain channel (12) consists of a grounding trench (122) and a drain pit (121). After determining the size of a drain pit (121), the resistance value in a single drain pit (121) is calculated, and the number of drain pits (121) required is calculated based on the target resistance value.

9. The construction method according to claim 8, characterized in that, Also includes: Excavate a grounding trench (122) and a spillway pit (121). The grounding trench (122) connects the spillway pit (121) to the wind turbine base (11) and connects two adjacent spillway pits (121). After excavation is completed, a drag-reducing layer (14) is filled and then backfilled.

10. A wind farm, characterized in that, The wind farm is provided with multiple wind turbines and each wind turbine is mounted on a wind turbine base assembly, the wind turbine base assembly being constructed as described in any one of claims 1-5; wherein the grounding member (13) connects at least two adjacent wind turbine bases (11).

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