Mud buoyant offshore wind turbine system and method of installation thereof

Abstract

The present application relates to a kind of mud floating offshore wind turbine system and its installation method.The system includes: multiple suction anchors, multiple gravity anchors, upper wind turbine, tower and wind turbine foundation;Wind turbine foundation includes column, first spherical shell, second spherical shell, multiple third spherical shells, multiple first connecting rods, multiple second connecting rods and multiple support rods;Each first spherical shell and each second spherical shell are provided with winch with multiple telescopic anchor discs, each suction anchor is connected with one first anchor chain, and the other end of each first anchor chain is connected with telescopic anchor disc in first spherical shell respectively;Each gravity anchor is connected with one second anchor chain, and the other end of each second anchor chain is connected with telescopic anchor disc in second spherical shell respectively;Each suction anchor and each gravity anchor are located below corresponding third spherical shell and side respectively, and are used for constraining the position of upper wind turbine in vertical direction and horizontal direction respectively.The present application can constrain the position of wind turbine system in vertical direction and horizontal direction simultaneously, and is high in safety.

Description

Technical Field

[0001] This invention relates to the field of offshore wind power technology, and in particular to a mud-floating offshore wind turbine system and its installation method. Background Technology

[0002] With the growing prominence of the energy crisis, offshore wind power, as a renewable energy source, has become an important component of the current energy structure. However, current offshore wind turbine systems only design one type of anchor structure to constrain the vertical position of the turbine, neglecting to constrain its horizontal position. Therefore, while the turbine system can operate stably in relatively stable marine environments, it can tilt under the impact of wind and waves in harsh conditions, leading to excessive horizontal displacement and even the risk of capsizing.

[0003] Therefore, there is an urgent need to provide a mud-floating offshore wind turbine system and its installation method to solve the above-mentioned technical problems. Summary of the Invention

[0004] One or more embodiments of the present invention describe a mud-floating offshore wind turbine system and its installation method, which can simultaneously constrain the position of the wind turbine system in the vertical and horizontal directions and has high safety.

[0005] In a first aspect, one embodiment of the present invention provides a mud-floating offshore wind turbine system, comprising: multiple gravity anchors, multiple suction anchors, and an upper wind turbine, a tower, a tower connector, and a wind turbine foundation connected sequentially in a vertical direction; the wind turbine foundation comprises a hollow column, a first spherical shell, a second spherical shell, multiple third spherical shells, multiple hollow first connecting rods, multiple second connecting rods, and multiple hollow support rods;

[0006] One end of each first link is connected to the circumferential outer wall of the second spherical shell, and the other end is connected to a third spherical shell, so that multiple third spherical shells are evenly surrounding the circumference of the second spherical shell. The two ends of each second link are connected to two adjacent third spherical shells. One end of each support rod is connected to a third spherical shell, and the other end is connected to the circumferential outer wall of a first spherical shell. Each first spherical shell and each second spherical shell is equipped with a winch with multiple telescopic anchor discs. Each suction anchor is connected to a first anchor chain, and the other end of each first anchor chain passes through the corresponding third spherical shell and the corresponding support rod and is connected to the corresponding telescopic anchor disc in the first spherical shell. Each gravity anchor is connected to a second anchor chain, and the other end of each second anchor chain passes through the corresponding third spherical shell and the corresponding first link and is connected to the corresponding telescopic anchor disc in the second spherical shell.

[0007] During operation, the vertical position of the upper fan can be restricted by adjusting the length of each first anchor chain using a winch, and the horizontal position of the upper fan can be restricted by adjusting the length of each second anchor chain using a winch.

[0008] Secondly, one embodiment of the present invention provides an installation method for a mud-floating offshore wind turbine system, applied to the offshore wind turbine system described in the above embodiment, the method comprising:

[0009] Each first anchor chain and each second anchor chain are in a slack state. Based on the ship's navigation and positioning system, each gravity anchor and each suction anchor are lowered to a designated location on the seabed, the designated location including a designated depth and a designated latitude and longitude.

[0010] Keep the wind turbine foundation in a balanced state, and adjust the length of each first anchor chain and each second anchor chain until the upper wind turbine reaches the specified working height.

[0011] According to embodiments of the present invention, an offshore wind turbine system and its installation method are provided. Firstly, by setting multiple suction anchors, each suction anchor being connected to a first anchor chain, and the other end of each first anchor chain passing through a corresponding third spherical shell and a corresponding support rod to connect to a corresponding telescopic anchor plate inside the first spherical shell, since each suction anchor is located directly below the corresponding third spherical shell, the upper wind turbine can be adjusted to a specified height by adjusting the length of each first anchor chain. Furthermore, when each first anchor chain is adjusted to a tensioned state, the vertical displacement of the upper wind turbine can be restricted, preventing it from detaching from the seabed in harsh environments. Secondly, by setting multiple gravity anchors, each gravity anchor being connected to a second anchor chain, and the other end of each second anchor chain passing through a corresponding third spherical shell and a corresponding first connecting rod to connect to a corresponding telescopic anchor plate inside the second spherical shell, since each gravity anchor is located on the side of the corresponding third spherical shell, when each second anchor chain is adjusted to a tensioned state, it is used to constrain the horizontal displacement of the upper wind turbine, preventing it from capsizing in harsh environments. Therefore, it can be seen that the present invention can simultaneously constrain the position of the wind turbine system in both the vertical and horizontal directions, and has high safety. Attached Figure Description

[0012] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0013] Figure 1 This is a three-dimensional structural diagram of a mud-floating offshore wind turbine system provided in an embodiment of the present invention;

[0014] Figure 2 This is a top view of a mud-floating offshore wind turbine system provided in an embodiment of the present invention;

[0015] Figure 3 This is a schematic diagram of the structure of a wind turbine foundation provided in an embodiment of the present invention;

[0016] Figure 4 This is a schematic diagram of the structure of a telescopic anchor plate provided in an embodiment of the present invention;

[0017] Figure 5 This is a schematic diagram of the internal structure of the third spherical shell provided in an embodiment of the present invention;

[0018] Figure 6 This is a three-dimensional structural diagram of a mud-floating offshore wind turbine system provided in another embodiment of the present invention;

[0019] Figure 7 A top view of a mud-floating offshore wind turbine system provided in another embodiment of the present invention;

[0020] Figure 8 This is a schematic diagram of the structure of a suction anchor provided in an embodiment of the present invention;

[0021] Figure 9 for Figure 1 The diagram shown illustrates the fan system in a mud-floating state.

[0022] Figure 10 A flowchart of an installation method for a mud-floating offshore wind turbine system is provided for one embodiment of the present invention.

[0023] Figure label:

[0024] 10-Suction Anchor;

[0025] 20-Gravity anchor;

[0026] 30 - Upper fan;

[0027] 40-Tower;

[0028] 50 - Tower connector;

[0029] 60-Wind turbine foundation;

[0030] 601 - Column; 602 - First spherical shell; 603 - Second spherical shell; 604 - Third spherical shell; 605 - First connecting rod; 606 - Second connecting rod; 607 - Support rod; 608 - First anchor chain; 609 - Second anchor chain; 610 - First compartment; 611 - Second compartment;

[0031] 70 - First Plinth;

[0032] 80 - Second base;

[0033] 90-Float. Detailed Implementation

[0034] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0035] To better understand the solution, the mud-floating offshore wind turbine system will be explained first:

[0036] A mud-floating offshore wind turbine system refers to a wind turbine foundation that can switch between a floating state and a mud-floating state. In the floating state, the wind turbine foundation floats on the sea surface or in the seawater. In this state, the upper wind turbine operates at a higher height, which is beneficial to improving power generation efficiency and is suitable for marine environments with good conditions. In the mud-floating state, the wind turbine foundation is fixed in the mud layer on the seabed. In this state, the upper wind turbine operates at a lower height, which is beneficial to improving safety and is suitable for marine environments with harsher conditions.

[0037] like Figures 1-3 As shown, this embodiment of the invention provides a mud-floating offshore wind turbine system, including: multiple suction anchors 10, multiple gravity anchors 20, and an upper wind turbine 30, a tower connector 50, a tower connector 50 connector, and a wind turbine foundation 60 connected in sequence along the vertical direction; the wind turbine foundation 60 includes a hollow column 601, a first spherical shell 602, a second spherical shell 603, multiple third spherical shells 604, multiple hollow first connecting rods 605, multiple second connecting rods 606, and multiple hollow support rods 607;

[0038] One end of each first link 605 is connected to the circumferential outer wall of the second spherical shell 603, and the other end is connected to a third spherical shell 604, so that multiple third spherical shells 604 are evenly surrounding the circumference of the second spherical shell 603. Both ends of each second link 606 are connected to two adjacent third spherical shells 604. One end of each support rod 607 is connected to a third spherical shell 604, and the other end is connected to the circumferential outer wall of a first spherical shell 602. Each first spherical shell 602 and each second spherical shell... Each of the 603 units is equipped with a winch with multiple telescopic anchor discs. Each suction anchor 10 is connected to a first anchor chain 608. The other end of each first anchor chain 608 passes through the corresponding third spherical shell 604 and the corresponding support rod 607, and then connects to the corresponding telescopic anchor disc inside the first spherical shell 602. Each gravity anchor 20 is connected to a second anchor chain 609. The other end of each second anchor chain 609 passes through the corresponding third spherical shell 604 and the corresponding first connecting rod 605, and then connects to the corresponding telescopic anchor disc inside the second spherical shell 603.

[0039] Each of the suction anchors 10 is located directly below the corresponding third spherical shell 604. When the first anchor chain 608 is in a tensioned state, it is used to constrain the upper fan 30 in the vertical direction. Each of the gravity anchors 20 is located on the side of the corresponding third spherical shell 604. When the second anchor chain 609 is in a tensioned state, it is used to constrain the upper fan 30 in the horizontal direction.

[0040] In this embodiment, firstly, by setting multiple suction anchors 10, each suction anchor 10 is connected to a first anchor chain 608. The other end of each first anchor chain 608 passes through a corresponding third spherical shell 604 and a corresponding support rod 607, and then connects to a corresponding telescopic anchor plate inside the first spherical shell 602. Since each suction anchor 10 is located directly below the corresponding third spherical shell 604, the upper fan 30 can be adjusted to a specified height by adjusting the length of each first anchor chain 608. Furthermore, when each first anchor chain 608 is adjusted to a tensioned state, the vertical displacement of the upper fan 30 can be restricted, preventing it from detaching from the seabed in harsh environments. Secondly, by setting multiple gravity anchors 20, each gravity anchor 20 is connected to a second anchor chain 609. The other end of each second anchor chain 609 passes through the corresponding third spherical shell 604 and the corresponding first connecting rod 605, and connects to the corresponding telescopic anchor plate inside the second spherical shell 603. Since each gravity anchor 20 is located on the side of the corresponding third spherical shell 604, when each second anchor chain 609 is adjusted to a tensioned state, it is used to restrain the horizontal displacement of the upper fan 30, preventing it from tipping over in harsh environments. Therefore, this invention can simultaneously restrain the fan system in both the vertical and horizontal directions, providing high safety.

[0041] It should be noted that when the wind turbine foundation 60 is in a balanced state, the centers of the second spherical shell 603, each of the third spherical shells 604, and each of the first connecting rods 605 are all on the same horizontal plane, and the distance from the center of each third spherical shell 604 to the center of the second spherical shell 603 is equal. Furthermore, this invention does not specifically limit the number of suction anchors 10, gravity anchors 20, and third spherical shells 604; users can choose 3, 6, 8, or other quantities as needed. When there are 3 gravity anchors 20, 3 suction anchors 10, and 3 third spherical shells 604, the structural diagram of the wind turbine system is as follows. Figure 6 and Figure 7 As shown. In addition, the first connecting rod 605, the second connecting rod 606, and the support rod 607 are preferably hollow round tubes, which improves the buoyancy of the wind turbine foundation while ensuring strength.

[0042] In addition, in order to further increase the buoyancy of the wind turbine system, such as Figure 1 and Figure 6 As shown, the present invention can also accommodate multiple floats 90 on the first connecting rod 605 and the second connecting rod 606. The floats 90 are preferentially arranged on the second connecting rod 606, which provides buoyancy to the structure while improving stability and facilitating cleaning and inspection. When additional buoyancy is required, floats 90 are fitted on the first connecting rod 605. After the floats 90 are fitted, the overall buoyancy of the wind turbine foundation 60 is: buoyancy of a single third spherical shell 604 * number of third spherical shells 604 + buoyancy of a single float 90 * number of floats 90.

[0043] like Figure 4 As described above, multiple telescopic anchor discs share a single winch, thus ensuring that each anchor chain has the same winding and unwinding rate when the winch is used to adjust the anchor chain length. Furthermore, as... Figure 1 The wind turbine system may further include a cylindrical second base 80, which is fixed within the mud bed on the seabed. The top of the second base 80 has a hemispherical groove with a guide rod at its center. The bottom of the second spherical shell 603 has a guide hole. When the wind turbine system is in a mud-floating state, such as... Figure 9 As shown, the guide rod is inserted into the guide hole, and the second spherical shell 603 is located in the groove of the second base 80, thereby restricting the horizontal displacement of the wind turbine foundation 60.

[0044] In some implementations, such as Figure 8 As shown, the suction anchor 10 consists of multiple suction cylinders, with the outer walls of adjacent suction cylinders connected to each other axially. By setting multiple suction cylinders, the friction between the suction anchor 10 and the mud bed can be increased, thereby improving the stability of the blower system.

[0045] In some implementations, such as Figure 8As shown, it also includes a plurality of cylindrical first bases 70, each of which has a hemispherical groove at its top end. The inner diameter of the groove is equal to the outer diameter of the third spherical shell 604, for accommodating the third spherical shell 604. A through hole is provided at the bottom center of the groove for the passage of the first anchor chain 608 on the suction anchor 10.

[0046] In this embodiment, by setting the first base 70, when the fan system is in a mud-floating state, such as Figure 9 As shown, the bottom end of the first base 70 is fitted onto the top end of the suction anchor 10, and the bottom end of the third float is located in the groove of the first base 70, which can further limit the horizontal displacement of the wind turbine foundation 60 and improve the stability of the wind turbine system.

[0047] In some implementations, such as Figure 5 As shown, each of the third spherical shells 604 includes an inner layer, a middle layer, and an outer layer arranged coaxially from the inside out. The inner layer is used for the passage of the first anchor chain 608 or the second anchor chain 609. The middle layer includes a plurality of first compartments 610 evenly distributed circumferentially. Each first compartment 610 is provided with a water inlet and a water outlet at its top and bottom ends, respectively. The outer layer includes a plurality of second compartments 611 evenly distributed circumferentially. Each second compartment 611 is provided with an air-water replacement valve.

[0048] In this embodiment, the inner, middle, and outer layers are not interconnected. The inner layer is an anchor chain channel, and the middle layer is a sludge flushing layer used to flush silt from the grooves of the first base 70. By providing multiple first chambers 610, the flushing is more thorough, allowing the third spherical shell 604 to better contact the grooves of the first base 70, ensuring the stability of the wind turbine system. The outer layer is a ballast tank. When water is added to the outer layer through the air-water replacement valve, its ballast increases, and the third spherical shell 604 sinks; when water is released from the outer layer through the air-water replacement valve, its ballast decreases, and the third spherical shell 604 floats. Thus, by adjusting the ballast of each third spherical shell 604, the balance of the wind turbine foundation 60 can be maintained. Furthermore, by providing multiple second chambers 611, each of which can be individually adjusted for ballast, the adjustment process can be more precise, further increasing the stability of the wind turbine system.

[0049] In addition, each gravity anchor 20 is equipped with a skirt at its bottom end, which allows the gravity anchor 20 to sink to a deeper position in the mud bed, increasing the stability of the blower system.

[0050] like Figure 10 As shown, this embodiment of the invention provides an installation method for a mud-floating offshore wind turbine system, applied to the mud-floating offshore wind turbine system described in the above embodiment. The method includes:

[0051] Step 1000: Each first anchor chain 608 and each second anchor chain 609 is in a slack state. Based on the ship navigation and positioning system, each gravity anchor 20 and each suction anchor 10 are lowered to a designated position on the seabed, the designated position including a designated depth and a designated latitude and longitude.

[0052] Step 1002: Keep the fan foundation 60 in a balanced state, and adjust the length of each first anchor chain 608 and each second anchor chain 609 until the upper fan 30 reaches the specified working height.

[0053] The method provided in this embodiment is applied to an offshore wind turbine system. This system enhances its balance by evenly distributing multiple third spherical shells 604 around the circumference of a second spherical shell 603. Therefore, during installation, the gravity anchor 20 and suction anchor 10 can be installed first. Once these are in place, adjusting the anchor chain length is sufficient to raise the upper wind turbine 30 to the designated working height, completing the overall installation of the wind turbine system. Specifically, during anchor chain adjustment, it is crucial to maintain the wind turbine foundation 60 in a balanced state to prevent the system from tipping over and ensure installation safety. This installation method only requires the installation of the gravity anchor 20 and suction anchor 10 based on the ship's navigation and positioning system. Maintaining the wind turbine foundation 60 in a balanced state and continuously adjusting the anchor chain length completes the overall installation of the wind turbine system. The installation process is simple and efficient.

[0054] In some implementations, for step 102, maintaining the wind turbine foundation 60 in a balanced state includes:

[0055] At each first time interval, the tilt angle of the wind turbine foundation 60 is obtained;

[0056] Determine whether the tilt angle is greater than a preset angle. If so, then perform the following: adjust the opening degree of the air-water replacement valve on each third spherical shell 604 to keep the fan foundation 60 in a stable state. The opening degree of each air-water replacement valve is directly proportional to the filling and discharging rate of the corresponding third spherical shell 604.

[0057] In this embodiment, the first time interval can be determined based on the marine environment. A smaller time interval is used when the marine environment is harsh, and a larger value is used when the environment is favorable. For example, the first time interval can be 5 seconds. Since the wind turbine and its foundation 60 are a single, rigid unit, the tilt angle of the foundation 60 is measured, which represents the overall tilt angle. The preset angle can be 5°. When the target tilt angle is greater than 5°, it indicates a significant tilt in the wind turbine system, posing a risk of collapse. Therefore, the ballast of each third spherical shell 604 needs to be adjusted to straighten the foundation 60 and ensure its proper installation. It should be noted that after the air-water replacement valve is opened, water can be pumped into or out of the corresponding third spherical shell 604. The larger the valve opening, the faster the water pumping and discharging rate, and the faster the ballast adjustment.

[0058] In some embodiments, adjusting the opening degree of the air-water replacement valve on each third spherical shell 604 includes:

[0059] For each of the third spherical shells 604 on the upward-sloping side, the opening degree of the air-water replacement valve on each of the third spherical shells 604 is increased; among them, the opening degree of the air-water replacement valve on the third spherical shell 604 in the middle is the largest, and the opening degree of the air-water replacement valve on each of the third spherical shells 604 is gradually decreased along the direction away from the middle third spherical shell 604; by increasing the opening degree of the air-water replacement valve, the water filling rate of the corresponding third spherical shell 604 is increased.

[0060] In this embodiment, when the wind turbine foundation 60 tilts, unilateral adjustment is performed on the wind turbine foundation 60. That is, the ballast of the third spherical shell 604 on the downward tilting side is not adjusted, but only the ballast of each of the third spherical shells 604 on the upward tilting side is adjusted, thereby ensuring the stability of the adjustment process. Furthermore, by increasing the opening degree of the air-water replacement valve of each third spherical shell 604, the water filling rate of the corresponding third spherical shell 604 can be increased, thereby increasing its ballast and allowing the wind turbine foundation 60 to return to its upright position. The different opening degrees of the air-water replacement valves of each third spherical shell 604 can accelerate the leveling speed and stability of the wind turbine foundation 60.

[0061] It should also be noted that when the wind turbine foundation 60 is in equilibrium, the axis of each first connecting rod 605, the center of the second spherical shell 603, and the center of each third spherical shell 604 are all on the same horizontal plane. For any given moment, the present invention uses the horizontal plane containing the center of each third spherical shell 604 in its equilibrium state as a reference plane. Third spherical shells 604 whose centers are above this reference plane are defined as upwardly inclined, and third spherical shells 604 whose centers are below this reference plane are defined as downwardly inclined.

[0062] In some embodiments, adjusting the opening degree of the air-water replacement valve on each third spherical shell 604 further includes:

[0063] For each of the third spherical shells 604 on the downward-sloping side, the opening degree of the air-water replacement valve on each of the third spherical shells 604 is increased; among them, the opening degree of the air-water replacement valve on the third spherical shell 604 in the middle is the largest, and the opening degree of the air-water replacement valve on each of the third spherical shells 604 is gradually decreased along the direction away from the third spherical shell 604 in the middle; by increasing the opening degree of the air-water replacement valve, the water discharge rate of the corresponding third spherical shell 604 is increased.

[0064] This embodiment addresses situations where the wind turbine system has a large tilt angle and a high risk of overturning. In this case, the wind turbine foundation 60 is adjusted on both sides simultaneously: the ballast of the third spherical shell 604 on both the upward and downward tilting sides is adjusted. This means increasing the ballast on the upward tilting side of the third spherical shell 604 while decreasing the ballast on the downward tilting side, accelerating the balancing process. Close monitoring of tilt angle changes is necessary to prevent reverse deflection of the system. Furthermore, different opening degrees of the air-water replacement valves on each of the third spherical shells 604 can further accelerate the leveling rate and improve the stability of the wind turbine foundation 60.

[0065] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0066] Finally, it should be noted that the above description is merely a preferred embodiment of the present invention and is only used to illustrate the technical solution of the present invention, and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention are included within the scope of protection of the present invention.

Claims

1. An installation method for a mud-floating offshore wind turbine system, characterized in that, This invention is applied to a mud-floating offshore wind turbine system, which includes multiple suction anchors (10), multiple gravity anchors (20), and an upper wind turbine (30), a tower connector (50), and a wind turbine foundation (60) connected in sequence along the vertical direction; the wind turbine foundation (60) includes a hollow column (601), a first spherical shell (602), a second spherical shell (603), multiple third spherical shells (604), multiple hollow first connecting rods (605), multiple second connecting rods (606), and multiple hollow support rods (607). One end of each first link (605) is connected to the circumferential outer wall of the second spherical shell (603), and the other end is connected to a third spherical shell (604), so that multiple third spherical shells (604) are evenly surrounding the circumference of the second spherical shell (603). The two ends of each second link (606) are connected to two adjacent third spherical shells (604); one end of each support rod (607) is connected to a third spherical shell (604), and the other end is connected to the circumferential outer wall of a first spherical shell (602); each first spherical shell (602) and each second spherical shell (605) 03) Each of the following is equipped with a winch with multiple telescopic anchor discs. Each suction anchor (10) is connected to a first anchor chain (608). The other end of each first anchor chain (608) passes through the corresponding third spherical shell (604) and the corresponding support rod (607) and is connected to the corresponding telescopic anchor disc in the first spherical shell (602). Each gravity anchor (20) is connected to a second anchor chain (609). The other end of each second anchor chain (609) passes through the corresponding third spherical shell (604) and the corresponding first connecting rod (605) and is connected to the corresponding telescopic anchor disc in the second spherical shell (603). Each of the suction anchors (10) is located directly below the corresponding third spherical shell (604), and when the first anchor chain (608) is in a tensioned state, it is used to constrain the upper fan (30) in the vertical direction; each of the gravity anchors (20) is located on the side of the corresponding third spherical shell (604), and when the second anchor chain (609) is in a tensioned state, it is used to constrain the upper fan (30) in the horizontal direction; Each of the third spherical shells (604) includes an inner layer, a middle layer, and an outer layer arranged coaxially from the inside out. The inner layer is used for the passage of the first anchor chain (608) or the second anchor chain (609). The middle layer includes a plurality of first compartments (610) evenly distributed circumferentially. Each first compartment (610) is provided with a water inlet and a water outlet at its top and bottom ends, respectively. The outer layer includes a plurality of second compartments (611) evenly distributed circumferentially. Each second compartment (611) is provided with an air-water replacement valve. The method includes: Each first anchor chain (608) and each second anchor chain (609) is in a slack state, and each gravity anchor (20) and each suction anchor (10) are lowered to a designated position on the seabed based on the ship navigation and positioning system, the designated position including a designated depth and a designated latitude and longitude; Keep the fan foundation (60) in a balanced state, and adjust the length of each first anchor chain (608) and each second anchor chain (609) until the upper fan (30) reaches the specified working height; Maintaining the wind turbine foundation (60) in a balanced state includes: At each first time interval, the tilt angle of the wind turbine foundation (60) is obtained; Determine whether the tilt angle is greater than the preset angle. If so, then perform the following: adjust the opening degree of the air-water replacement valve on each third spherical shell (604) to keep the fan foundation (60) in a stable state. The opening degree of each air-water replacement valve is directly proportional to the filling and discharging rate of the corresponding third spherical shell (604). The adjustment of the opening degree of the air-water replacement valve on each third spherical shell (604) includes: For each of the third spherical shells (604) on the upward tilting side, the opening degree of the air-water replacement valve on each of the third spherical shells (604) is increased; among them, the opening degree of the air-water replacement valve on the third spherical shell (604) in the middle is the largest, and the opening degree of the air-water replacement valve on each of the third spherical shells (604) is gradually decreased along the direction away from the middle third spherical shell (604); by increasing the opening degree of the air-water replacement valve, the water filling rate of the corresponding third spherical shell (604) is increased; A mud-floating offshore wind turbine system refers to a wind turbine foundation that can switch between a floating state and a mud-floating state. The floating state means that the wind turbine foundation floats on the sea surface or in the seawater; the mud-floating state means that the wind turbine foundation is fixed in the mud layer on the seabed.

2. The method according to claim 1, characterized in that, The adjustment of the opening degree of the air-water replacement valve on each third spherical shell (604) further includes: For each of the third spherical shells (604) on the downward tilting side, the opening degree of the air-water replacement valve on each of the third spherical shells (604) is increased; among them, the opening degree of the air-water replacement valve on the third spherical shell (604) in the middle is the largest, and the opening degree of the air-water replacement valve on each of the third spherical shells (604) is gradually decreased along the direction away from the third spherical shell (604); by increasing the opening degree of the air-water replacement valve, the water discharge rate of the corresponding third spherical shell (604) is increased.

3. The method according to claim 1, characterized in that, The suction anchor (10) is composed of multiple suction cylinders, and the outer walls of adjacent suction cylinders are connected to each other along the axial direction.

4. The method according to claim 3, characterized in that, It also includes a plurality of cylindrical first bases (70), each of which has a hemispherical groove at its top end. The inner diameter of the groove is equal to the outer diameter of the third spherical shell (604) for accommodating the third spherical shell (604). A through hole is provided at the bottom center of the groove for the passage of the first anchor chain (608) on the suction anchor (10).

5. The method according to claim 1, characterized in that, Each of the gravity anchors (20) is provided with a skirt at its bottom end.

6. The method according to claim 1, characterized in that, At least one float (90) is fitted on the outer wall of each of the first links (605) and each of the second links (606).

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