A tension leg type offshore wind power platform and a dynamic balance adjustment method for its tendons

Abstract

This invention discloses a tension leg offshore wind turbine platform and a dynamic balance adjustment method for its tendons. The wind turbine platform includes a central column, side buoys, a floating bridge, and tendons. Multiple ballast tanks are located inside both the floating bridge and the side buoys. Multiple emergency water inlets are located at the bottom of the floating bridge and the top and bottom of the side buoys. A ballast tank connection port, selectively connecting to the ballast tanks of the floating bridge, is located at the lower part of the ballast tank near the buoy. A ballast system is installed inside each ballast tank, which can perform ballast discharge or selectively transfer water from one ballast tank to another. This invention can selectively adjust the internal ballast based on tendon tension through natural flow and / or mechanical means. It can determine the location and number of tendon failures and formulate emergency control strategies based on the tendon failure status. This not only improves the lifespan of the mooring system but also enhances the self-survival performance of the tension leg platform under mooring system failure.

Description

Technical Field

[0001] This invention relates to the field of marine floating wind power engineering technology, and in particular to a tension leg type offshore wind power platform and a method for dynamic balance adjustment of tendons. Background Technology

[0002] Wind energy, as a renewable and clean energy source, boasts advantages such as environmental friendliness and wide applicability. Compared to onshore wind energy, offshore wind energy resources have even greater potential. With the deepening development of offshore wind power resources, floating wind power has gradually become a key area of ​​research and application. Currently, the main types of floating wind turbine platforms include tension leg type, column type, barge type, and semi-submersible type. Among them, the tension leg type floating wind turbine uses a tensioned mooring system, exhibiting small movement amplitude caused by external loads and demonstrating good hydrodynamic performance, thus possessing certain advantages and prospects in offshore wind power development.

[0003] However, the mooring system of floating wind turbines may fail due to corrosion, fatigue damage, extreme storms, or accidental collisions. Semi-submersible and other floating wind turbines, because the difference between platform buoyancy and gravity is not significant, will only drift extensively after mooring failure. However, tension leg floating wind turbines have buoyancy much greater than gravity. After mooring failure, the floating platform will capsize and sink due to the inability to maintain balance, resulting in more severe consequences.

[0004] Existing technologies generally adjust tendon tension by regulating the amount of ballast water in the side pontoons to reduce tendon fatigue, as illustrated in CN119590559A and CN119176209A. This method is suitable for the overall adjustment of the mooring system and is generally used for initial adjustments during installation. In operation, ballast water discharge causes overall buoyancy changes, making frequent alterations to the platform's relative buoyancy unsuitable. Existing technologies CN107709151A and CN115853719A disclose multiple ballast tanks in the side pontoons and floating bridges. While these technologies incorporate multiple ballast tanks, they operate relatively independently and cannot work collaboratively to adapt to various operating conditions. CN102015435A discloses an active ballast system that transfers water from different support tanks to maintain platform verticality. While these existing technologies address platform balance adjustment, they do not address the control of various tendon abnormalities and cannot effectively handle various situations encountered by wind power platforms during operation, especially emergency handling in case of tendon failure.

[0005] To address these issues, it is urgent to propose an emergency response and dynamic balance adjustment method for tendon failure in tension leg offshore wind power platforms, thereby increasing the self-sustaining performance of tension leg platforms under mooring failures. Summary of the Invention

[0006] To address the aforementioned technical problems, this invention proposes a tension leg offshore wind power platform with a tendon dynamic balance adjustment system. This system can dynamically balance the tendons of the wind power platform, and in particular, it can detect tendon failure and formulate emergency control strategies based on the tendon failure status. This not only improves the lifespan of the mooring system but also enhances the self-sustaining performance of the tension leg platform under mooring system failure.

[0007] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0008] A tension leg offshore wind power platform includes a central column, side pontoons, floating bridges, diagonal bracing members, horizontal members, and tendons. The central column, located in the middle, supports the wind turbine equipment. Multiple side pontoons are evenly distributed around the central column. The side pontoons are connected and fixed to the central column and the side pontoons via multiple floating bridges. The height of the side pontoons is greater than the height of the floating bridges; the bottom surface of the floating bridges is flush with the bottom surface of the central column, and the top surface of the floating bridges is flush with the top surface of the side pontoons. The upper part of the central column is connected to the top of each side pontoon via diagonal bracing members, and the side pontoons are connected to each other via horizontal members, thus forming a stable structure for the entire wind power platform. Tendons are also installed at the bottom of the side pontoons, which anchor the wind power platform to the seabed. The tendons are connected to the bottom of the side pontoons via tendon connectors; each side pontoon is connected to two tendons. The tendon connectors contain tension monitoring components to monitor the tendon tension.

[0009] Both the floating bridge and the side pontoons have multiple ballast tanks inside. Emergency water inlets are located at the bottom of the floating bridge and / or the top and bottom of the side pontoons. An emergency water inlet is located at the bottom of at least the ballast tank closest to the side pontoons. Horizontal and vertical bulkheads are located in the middle of the side pontoons, dividing the interior into eight pontoon ballast tanks, each with an emergency water inlet.

[0010] The ballast tanks of the floating bridge and side pontoons are enclosed spaces, and the multi-tank structure can enhance the structural strength of the side pontoons and the floating bridge. If any ballast tank of the side pontoons or the floating bridge is damaged, the remaining ballast tanks can still adjust the buoyancy of the platform.

[0011] A ballast tank connection port is provided at the lower part of the ballast tank of the floating bridge near the side buoy, which can selectively connect with the ballast tank of the upper buoy. Seawater inside the ballast tank of the floating bridge can flow naturally into the ballast tank of the buoy through the ballast tank connection port. When the ballast tank connection port is open, seawater inside the ballast tank of the floating bridge can flow naturally into the ballast tank of the buoy. In this way, the ballast weight can be transferred radially outward along the platform, thereby increasing the ballast torque of the wind power platform.

[0012] The ballast tanks are equipped with a ballast system, which includes a seawater gate, seawater main, ballast piping, ballast valves, ballast pumps, an overboard main, discharge piping, discharge valves, discharge pumps, manifolds, branch lines, common lines, secondary ballast discharge pumps, and secondary manifolds. The ballast system can selectively transfer water from any ballast tank to other ballast tanks, and can also ballast external seawater into any ballast tank or discharge it from the wind turbine platform.

[0013] The seagate is located on the outer surface of the bottom of the central pillar. Seawater can enter the seawater main through the seagate. The ballast pipeline is connected to the seawater main. Ballast valves and ballast pumps are installed along the pipeline path of the ballast pipeline. The overboard main is located at the top of the inner surface of the central pillar. The discharge pipeline is connected to the overboard main. Discharge valves and discharge pumps are installed along the pipeline path of the discharge pipeline. Water in the wind power platform can be discharged to the outside through the overboard main.

[0014] Ballast and discharge pipelines pass through the central pillar and connect to the manifold, which is located inside the floating bridge. The manifold also has connection ports connecting to several branch pipelines and common pipelines. One end of each branch pipeline connects to the manifold, and the other end of each branch pipeline connects to the floating bridge's ballast tanks. The secondary manifold connects to the manifold via common pipelines, which house secondary ballast pumps. The secondary manifold is located inside the side buoys and also has several connection ports connecting to secondary branch pipelines. One end of each secondary branch pipeline connects to the secondary manifold, and the other end leads to the individual buoy ballast tanks. The manifold and secondary manifolds form a valve assembly structure, allowing selective connection between the various floating bridge and buoy ballast tanks. This enables selective replenishment or discharge of seawater into or from each ballast tank, and also allows selective transfer of water from any ballast tank to other ballast tanks.

[0015] A method for dynamic balancing of the tendons of a tension leg offshore wind power platform is disclosed. This method allows for selective opening of the ballast tank connection port and / or the secondary ballast pumps, manifolds, and secondary manifolds of the ballast system, enabling the transfer of ballast water between the floating bridge ballast tank and the side buoy ballast tank. When ballasting is required, the emergency inlets at the bottom of the floating bridge and / or the top and bottom of the side buoys can be selectively opened, allowing seawater to flow naturally into the corresponding ballast tanks. When ballasting speed needs to be accelerated, the ballast pumps, secondary ballast pumps, manifolds, and secondary manifolds of the ballast system can be further activated for mechanical ballasting. When unloading is required, the unloading pumps, secondary ballast pumps, manifolds, and secondary manifolds of the ballast system can be selectively activated, allowing seawater in the corresponding ballast tanks to be discharged from the platform.

[0016] The method includes the following steps:

[0017] 1. The overall tendon tension is monitored in real time through tendon connector 71. When the fluctuation period of the tension data is less than the first time threshold and the fluctuation amplitude exceeds the first amplitude for a certain period of time, the ballast tank connection port is opened so that the ballast water in the ballast tank of the floating bridge at least near the side buoy flows into the ballast tank of the side buoy.

[0018] 2. When the period of continuous fluctuation of tension data is less than the second time threshold and the fluctuation amplitude continues to exceed the second amplitude within a certain period of time, in addition to opening the ballast tank connection port, the secondary ballast pump, manifold, and secondary manifold shall be further opened to transfer the ballast seawater in the floating bridge ballast tank evenly and / or in a controlled manner to the floating ballast tank.

[0019] 3. The tendon connector 71 monitors the tendon tension. If the tension of a tendon drops sharply and does not recover after a certain period of time, the tension of the other adjacent tendon on the same side of the float will continue to be monitored.

[0020] (1) If the tension of the adjacent tendon increases significantly, the tendon is considered to have failed. In this case, open the emergency water inlets at the bottom of the floating bridge and / or the top and bottom of the side floats corresponding to the tendon failure, and let seawater flow into the ballast tank naturally.

[0021] (2) If the tension of adjacent tendons decreases sharply, it is determined that the two tendons of the same side buoy have failed at the same time. In this case, open all emergency water inlets of the floating bridge and side buoys and ballast tank connection ports, and at the same time open the seabed gate, ballast valve, ballast pump, manifold, secondary ballast pump and secondary manifold of the ballast system. While the ballast water is naturally ballasted in through the emergency water inlets, the ballast system is mechanically ballasted in.

[0022] After personnel replace or repair the failed tendon, seawater in the ballast tank is discharged through the ballast system, allowing the tendon to re-tension and the mooring system to return to normal operation.

[0023] The present invention has the following beneficial effects:

[0024] 1. The tension leg offshore wind power platform of the present invention has a tendon dynamic balance adjustment system, which can adjust the internal ballast according to the changes in tendon tension, selectively adjust the internal ballast by natural flow and / or mechanical means, and improve the overall wind and wave torque resistance of the platform by transferring the internal ballast water to a position away from the center.

[0025] 2. The tension leg offshore wind power platform of the present invention can determine the location and number of tendon failures, and formulate emergency control strategies based on the tendon failure status, which not only improves the life of the mooring system, but also increases the self-survival performance of the tension leg platform under mooring system failure.

[0026] 3. The tension leg offshore wind power platform of the present invention has multiple ballast adjustment methods. By combining different ballast adjustment methods such as internal self-adjustment, internal mechanical adjustment, external natural water inflow, and external mechanical ballast water inflow, the overall control and adjustment flexibility of the wind power platform is improved. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0028] Figure 2 This is a schematic diagram of the internal structure of the present invention;

[0029] Figure 3 This is a side view of the overall structure of the present invention;

[0030] Figure 4 This is a bottom view of the overall structure of the present invention;

[0031] Figure 5 This is a schematic diagram of the internal structure of the side float of the present invention;

[0032] The diagram is marked with the following symbols: 1. Central column, 2. Side buoy, 21. Horizontal bulkhead, 22. Vertical bulkhead, 23. Buoy ballast tank, 3. Floating bridge, 31. Floating bridge ballast tank, 4. Diagonal bracing member, 5. Horizontal member, 6. Emergency inlet, 61. Seagate, 62. Seawater main, 63. Ballast pipeline, 64. Ballast valve, 65. Ballast pump, 66. Outboard main, 67. Discharge pipeline, 68. Discharge valve, 69. Discharge pump, 610. Manifold, 611. Branch pipeline, 612. Common pipeline, 613. Secondary ballast discharge pump, 614. Secondary manifold, 615. Ballast tank connection port, 7. Tendon, 71. Tendon connector. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of this invention clearer, the invention is described below with reference to specific embodiments shown in the accompanying drawings. However, it should be understood that these descriptions are merely exemplary and not intended to limit the scope of the invention. Furthermore, descriptions of well-known structures and technologies are omitted in the following description to avoid unnecessarily obscuring the concept of the invention.

[0034] Combination Figures 1-5 This embodiment describes a tension leg offshore wind power platform, such as... Figure 1As shown, this is a tension leg offshore wind turbine platform. The platform includes a central column 1, side pontoons 2, floating bridges 3, diagonal bracing members 4, horizontal members 5, an emergency water inlet 6, and tendons 7. The central column 1 is located in the middle and supports the wind turbine equipment. There are three side pontoons 2, evenly distributed around the central column 1. The side pontoons 3 are connected and fixed to the central column 1 and the three side pontoons 2 respectively by the three floating bridges 3. The height of the side pontoons 3 is greater than the height of the floating bridges 3. The bottom surface of the floating bridges 3 is flush with the bottom surface of the central column 1, and the top surface of the floating bridges 3 is flush with the top surface of the side pontoons 2. In addition, the upper part of the central column 1 is connected to the top of each side pontoon 2 by diagonal bracing members 4. The side pontoons 2 are connected to each other by horizontal members 5, forming an equilateral triangle. The central column 1 is located at the center of the equilateral triangle. Thus, the entire wind turbine platform forms a stable base structure. A tendon 7 is also provided at the bottom of the side buoy 2, which can anchor the wind power platform to the seabed. The tendon 7 is connected to the bottom of the side buoy 2 through a tendon connector 71. Each side buoy 2 is connected to two tendons 7. The tendon connector 71 contains a tension monitoring component that can monitor the tension of the tendons.

[0035] like Figure 2-5 As shown, both the floating bridge 3 and the side pontoons 2 have multiple ballast tanks inside. Emergency water inlets 6 are provided at the bottom of the floating bridge 3 and / or at the top and bottom of the side pontoons 2. Preferably, the floating bridge 3 has three floating bridge ballast tanks 31 arranged along the length of the floating bridge, with an emergency water inlet 6 at the bottom of at least the floating bridge ballast tank 31 closest to the side pontoons 2. The side pontoons 2 have a horizontal partition 21 and a vertical partition 22 in the middle, dividing the interior of the side pontoons 2 into eight pontoon ballast tanks 23. Each pontoon ballast tank 23 has an emergency water inlet 6; that is, the top of the upper four pontoon ballast tanks has an emergency water inlet 6, and the bottom of the lower four pontoon ballast tanks has an emergency water inlet 6.

[0036] The ballast tanks of the floating bridge 3 and the side pontoons 2 are sealed spaces. The horizontal bulkheads 21 and vertical bulkheads 22 inside the side pontoons 2, as well as the floating bridge bulkheads that divide the interior of the floating bridge 3 into eight ballast tanks 31, can structurally enhance the structural strength of the side pontoons 2 and the floating bridge 3. When any ballast tank of the side pontoons 2 or the floating bridge 3 is damaged, the remaining ballast tanks can still adjust the buoyancy of the platform.

[0037] like Figure 2As shown, a ballast tank connection port 615 is provided at the lower part of the floating bridge ballast tank 31 near the side buoy 2, which can selectively communicate with the upper floating buoy ballast tank 23. Seawater inside the floating bridge ballast tank can naturally flow into the floating buoy ballast tank through the ballast tank connection port 615. When the ballast tank connection port 615 is open, seawater inside the floating bridge ballast tank 31 can naturally flow into the floating buoy ballast tank 23. The ballast tank connection port 615 is closed during normal platform operation. In certain special situations, such as when the sea waves increase and the tension distribution of the tendons fluctuates continuously, it is necessary to increase the overall stability of the platform. At this time, the ballast tank connection port 615 is opened, allowing seawater to flow directly and naturally from the floating bridge ballast tank 31 into the floating buoy ballast tank 23. In this way, the ballast weight can be transferred radially outward along the platform, increasing the ballast torque of the wind power platform and overcoming the effects of wind and waves. With buoyancy remaining constant, this adjustment of the ballast weight position can change the wind and wave resistance of the wind power platform; or, for example, when the speed of mechanically increasing ballast cannot meet the requirements, the ballast torque can be increased through natural ballast transfer.

[0038] Emergency inlet 6 has a control switch to allow seawater to directly enter each ballast tank. Preferably, an auxiliary ballast pump can be installed inside emergency inlet 6 to increase the water intake rate. The ballast tank contains a vent pipe connected to the platform above the water surface. When seawater enters or exits the ballast tank, the vent pipe selectively opens to maintain a constant air pressure inside the ballast tank, allowing seawater to enter and exit without air pressure creating resistance to the ballast tank's water intake or drainage.

[0039] like Figure 2 As shown, the ballast tanks are equipped with a ballast system. This system can selectively transfer ballast water from one ballast tank to another, and can also ballast external seawater into or out of the wind turbine platform. The ballast system includes a seagate 61, a seawater main pipe 62, ballast pipelines 63, ballast valves 64, ballast pumps 65, an overboard main pipe 66, discharge pipelines 67, discharge valves 68, discharge pumps 69, a manifold 610, branch pipelines 611, a common pipeline 612, secondary ballast discharge pumps 613, and a secondary manifold 614.

[0040] The seagate 61 is located on the outer surface of the bottom of the central column 1. A seawater main pipe 62 is installed at the bottom of the inner surface of the central column 1. The seagate 61 is connected to the seawater main pipe 62. Seawater can enter the seawater main pipe 62 through the seagate 61. The ballast pipeline 63 is connected to the seawater main pipe 62. Ballast valve 64 and ballast pump 65 are installed on the pipeline path of the ballast pipeline 63. The overboard main pipe 66 is located at the top of the inner surface of the central column 1. The discharge pipeline 67 is connected to the overboard main pipe 66. Discharge valve 68 and discharge pump 69 are installed on the pipeline path of the discharge pipeline 67. Water in the wind power platform can be discharged to the outside through the overboard main pipe 66.

[0041] Ballast pipeline 63 and discharge pipeline 67 pass through the central pillar 1 and connect to manifold 610. Manifold 610 is located inside the floating bridge 3 and also has connection ports connecting to several branch pipelines 611 and common pipelines 612. The number of branch pipelines 611 is equal to the number of ballast tanks of the floating bridge. One end of each branch pipeline 611 is connected to manifold 610, and the other end of each branch pipeline 611 is connected to the ballast tank 31 of the floating bridge. Secondary manifold 614 is connected to manifold 610 through common pipeline 612. Common pipeline 612 is equipped with a secondary ballast pump 613. Secondary manifold 614 is located inside the side buoys 2 and also has several connection ports connecting to secondary branch pipelines. One end of each secondary branch pipeline is connected to secondary manifold 614, and the other end leads to the ballast tanks 23 of each buoy. Manifold 610 and secondary manifold 614 are valve assembly structures. Through manifold 610 and secondary manifold 614, each pontoon ballast tank 31 and pontoon ballast tank 23 can be selectively connected. This allows for selective replenishment or discharge of seawater into each ballast tank, as well as selective transfer of water from any ballast tank to other ballast tanks.

[0042] When the wind turbine is installed on the platform for overall towing, the waterline position of the platform is controlled between the top and bottom of the floating bridge 3 by adjusting the ballast water volume in the ballast tank to facilitate towing. When the wind turbine reaches the working position, the waterline position of the platform is controlled above the top of the floating bridge 3 by adjusting the ballast water volume in the ballast tank. After the tendon is anchored, the ballast water volume in the ballast tank is adjusted to keep the tendon within a reasonable tension range.

[0043] There is one seawater main pipe 62 and one overboard main pipe 66. The number of ballast pipes 63 and ballast discharge pipes 67 is the same as that of the floating bridge 3. The manifold 610 and the secondary manifold 614 are equipped with multiple valve groups, which can control the opening and closing of the branch pipes 611 and the common pipes 612 respectively.

[0044] During ballasting, the ballast system draws seawater into the seawater main pipe 62 through the seabed gate 61, and the ballast pump 65 is activated. The seawater is distributed through the ballast pipeline 63 into the manifold 610 and / or the branch pipeline 611 connecting the floating bridge ballast tank 31. The seawater in the common pipeline 612 flows into the secondary manifold 614 and is distributed to the corresponding floating bridge ballast tanks through the secondary branch pipelines. During unloading, the ballast valve 64 is opened first for ballasting, and driving water is injected into the common pipeline 612 and the branch pipeline 611. Then the ballast valve 64 is closed, and the unloading pump 69 and the secondary ballast pump 613 are started to transport the seawater in the ballast tanks to the overboard main pipe 66 through the unloading pipeline 67 and discharge it uniformly at the top of the central column 1.

[0045] The ballast system can work in conjunction with the emergency inlet 6 to accelerate the water intake rate of the ballast tanks. When it is necessary to reduce the overall buoyancy of the platform, i.e., when ballast is required, the emergency inlets 6 at the bottom of the floating bridge 3 and the top and bottom of the side floats 2 can be selectively opened to allow seawater to flow naturally into the corresponding ballast tanks. When it is necessary to accelerate the buoyancy reduction rate, i.e., to accelerate the ballast speed, the ballast pump 65, secondary ballast discharge pump 613, manifold 610, and secondary manifold 614 can be further activated on the basis of natural seawater ballast to carry out mechanical ballast, increase the ballast speed, and quickly reduce buoyancy. When it is necessary to increase the overall buoyancy of the platform, i.e. when unloading, the unloading pump 69, secondary ballast discharge pump 613, manifold 610, and secondary manifold 614 can be selectively activated to discharge seawater from the corresponding ballast tanks to the platform.

[0046] A method for dynamic balance adjustment of the tendons of a tension leg offshore wind power platform is disclosed. This method allows for selective opening of the ballast tank connection port and / or the secondary ballast pump, manifold, and secondary manifold of the ballast system, enabling the transfer of ballast water between the floating bridge ballast tank and the side buoy ballast tank. When ballasting is required, the emergency inlets 6 at the bottom of the floating bridge 3 and / or the top and bottom of the side buoy 2 can be selectively opened, allowing seawater to flow naturally into the corresponding ballast tank. When ballasting speed needs to be accelerated, the ballast pump 65, secondary ballast pump 613, manifold 610, and secondary manifold 614 can be further activated for mechanical ballasting. When unloading is required, the unloading pump 69, secondary ballast pump 613, manifold 610, and secondary manifold 614 can be selectively activated, allowing seawater in the corresponding ballast tank to be discharged from the platform.

[0047] The method includes the following steps:

[0048] 1. The overall tendon tension is monitored in real time through tendon connector 71. When the fluctuation period of the tension data is less than the first time threshold and the fluctuation amplitude exceeds the first amplitude for a certain period of time, the ballast tank connection port 615 is opened so that the ballast water in the ballast tank of the floating bridge at least near the side buoy flows into the ballast tank of the side buoy.

[0049] When, within a certain time period, the fluctuation period of the tension data is less than the first time threshold, and the fluctuation amplitude consistently exceeds the first amplitude, it is considered that there are certain wind and waves in the sea area where the wind turbine platform is located. These wind and waves will cause continuous fluctuations in the tension of the wind turbine platform's tendons. These tension fluctuations will affect the service life of the tendons and other mooring systems. Therefore, it is necessary to improve the overall stability of the wind turbine platform. This can be achieved by shifting the internal ballast water away from the center, thereby increasing the platform's overall resistance to wind and wave torque, stabilizing the platform, and reducing tension fluctuations.

[0050] Preferably, when the wind power platform is in an initial stable state, the initial ballast seawater can be filled into the ballast tank of the floating bridge as much as possible. On the one hand, this reduces the stress on the cantilever beam of the floating bridge, and on the other hand, it provides room for adjustment for subsequent abnormal tendon tension.

[0051] 2. When the period of continuous fluctuation of tension data is less than the second time threshold and the fluctuation amplitude continues to exceed the second amplitude within a certain period of time, in addition to opening the ballast tank connection port 615, the secondary ballast pump 613, manifold 610 and secondary manifold 614 will be further opened to transfer the ballast seawater in the floating bridge ballast tank evenly and / or in a controlled manner to the floating ballast tank.

[0052] If, within a certain time period, the fluctuation period of the tension data is less than the second time threshold, and the fluctuation amplitude continuously exceeds the second amplitude, and the second time threshold is less than the first time threshold and the second amplitude is greater than the first amplitude, then it is considered that there are large waves in the sea area where the wind power platform is located, and it is necessary to further enhance the overall stability of the wind power platform. At this time, water in the floating bridge ballast tank is selectively transferred to the floating ballast tank as much as possible. On the basis of natural ballast transfer, ballast is further transferred mechanically, so that the ballast seawater in the floating bridge ballast tank is transferred evenly and / or in a controlled manner to the floating ballast tank, making the platform more stable.

[0053] 3. The tendon connector 71 monitors the tendon tension. If the tension of a certain tendon drops sharply and does not recover after a certain period of time, the tension of the other tendon on the same side of the float will continue to be monitored.

[0054] (1) If the tension of the adjacent tendon increases significantly, the tendon is considered to have failed. In this case, open the emergency water inlet 6 at the bottom of the floating bridge 3 and / or the top and bottom of the side float 2 corresponding to the tendon failure, and let seawater flow into the ballast tank naturally until the tension of the adjacent tendon returns to the normal range.

[0055] (2) If the tension of adjacent tendons decreases sharply, it is determined that the two tendons 7 of the same side float 2 have failed at the same time. In this case, open the floating bridge 3, all emergency water inlets 6 of the side float 2 and the ballast tank connection port 615 corresponding to the failed tendon, and at the same time open the seabed door 61, ballast valve 64, ballast pump 65, manifold 610, secondary ballast pump 613 and secondary manifold 614 of the ballast system. While the ballast water is naturally ballasted in through the emergency water inlet, the ballast system is mechanically ballasted in to accelerate the speed at which seawater enters the ballast tank.

[0056] Preferably, through the control of manifold 610, the ballast water intake of the ballast system can be preferentially allocated to the ballast tanks of the side pontoons, so that more seawater flows into the ballast tanks 23 of the pontoons further away from the central column 1, which quickly reduces the buoyancy of the platform and increases the ballast torque to prevent the tension leg platform from capsizing.

[0057] After personnel replace or repair the failed tendon, seawater in the ballast tank is discharged through the ballast system, allowing the tendon to re-tension and the mooring system to return to normal operation.

[0058] The above are merely specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A tension leg offshore wind power platform, the wind power platform comprising a central column, side buoys, floating bridges, and tendons, wherein the central column is located in the middle, a plurality of side buoys are evenly distributed around the central column, the central column and the plurality of side buoys are respectively connected by a plurality of floating bridges, and a tendon is provided at the bottom of each side buoy, characterized in that, Both the floating bridge and the side buoys are equipped with multiple ballast tanks. The bottom of the floating bridge and the top and bottom of the side buoys are equipped with multiple emergency water inlets. A ballast tank connection port is provided at the lower part of the ballast tank of the floating bridge near the side buoy, which can selectively communicate with the ballast tank of the buoy. Seawater inside the ballast tank of the floating bridge can flow naturally into the ballast tank of the buoy through the ballast tank connection port. The ballast tank is equipped with a ballast system, which can perform ballast discharge or selectively transfer water from any ballast tank to other ballast tanks.

2. The tension leg offshore wind power platform as described in claim 1, characterized in that, The number of side pontoons and the number of floating bridges are three. The upper part of the central column is connected to the top of each side pontoon by diagonal bracing members. The side pontoons are also connected to each other by horizontal members to form an equilateral triangle structure.

3. The tension leg offshore wind power platform as described in claim 2, characterized in that, The tendons are connected to the bottom of the side floats via tendon connectors, the tendon connectors containing tension monitoring components, and each side float is connected to two tendons.

4. The tension leg offshore wind power platform as described in claim 1, characterized in that, The ballast tanks of the floating bridge are arranged along the length of the floating bridge, and an emergency water inlet is provided at the bottom of the ballast tank closest to the side buoy.

5. The tension leg offshore wind power platform as described in claim 4, characterized in that, The side buoy is equipped with horizontal and vertical partitions, which divide the interior of the side buoy into eight buoy ballast tanks. Each buoy ballast tank is equipped with an emergency water inlet.

6. The tension leg offshore wind power platform as described in any one of claims 1-5, characterized in that, The ballast system includes ballast pipelines, discharge pipelines, ballast valves, ballast pumps, discharge valves, discharge pumps, manifolds, branch pipelines, common pipelines, secondary ballast discharge pumps, and secondary manifolds. The ballast pipelines and discharge pipelines are connected to the manifolds. The manifolds are connected to multiple branch pipelines connecting each of the pontoon ballast tanks and the common pipeline connecting the secondary manifolds. The secondary manifolds are connected to each of the pontoon ballast tanks.

7. A method for dynamic balance adjustment of the tendons of a tension leg offshore wind power platform, characterized in that, The ballast tank connection port and / or the secondary ballast pump, manifold, and secondary manifold of the ballast system can be selectively opened to allow the ballast water in the pontoon ballast tank and the side pontoon ballast tank to be transferred to each other. When ballast is required, the emergency water inlets at the bottom of the floating bridge and / or the top and bottom of the side pontoons can be selectively opened to allow seawater to flow naturally into the corresponding ballast tanks; when it is necessary to accelerate the ballast speed, the ballast system can be selectively activated for mechanical ballast. When ballast needs to be discharged, the ballast system can be selectively activated to discharge seawater from the corresponding ballast tanks onto the platform.

8. The method as described in claim 7, characterized in that, The method specifically includes: (1) The overall tendon tension is monitored in real time through the tendon connector. When the tension data fluctuates continuously for a certain period of time, the fluctuation period is less than the first time threshold and the fluctuation amplitude exceeds the first amplitude, the ballast tank connection port is opened so that the ballast water in the ballast tank of the floating bridge at least near the side float flows into the ballast tank of the side float. (2) When the period of continuous fluctuation of tension data is less than the second time threshold and the fluctuation amplitude continues to exceed the second amplitude within a certain period of time, the secondary ballast pump, manifold and secondary manifold shall be opened in addition to opening the ballast tank connection port, so that the ballast seawater in the pontoon ballast tank is transferred to the pontoon ballast tank.

9. The method as described in claim 8, characterized in that, The method further includes: (3) If the tension of a certain tendon drops sharply and does not recover after a certain period of time, the tension of the other tendon on the same side of the float should be tested. If the tension of an adjacent tendon increases significantly, the tendon is considered to have failed. In this case, open the emergency water inlets at the bottom of the floating bridge and / or the top and bottom of the side floats corresponding to the tendon failure, allowing seawater to flow naturally into the ballast tank. If the tension of adjacent tendons decreases sharply, it is determined that the two tendons on the same side buoy have failed simultaneously. In this case, open all emergency water inlets and ballast tank connections of the floating bridge and side buoy corresponding to the failed tendon, and at the same time open the ballast system. While natural ballast water is introduced from the emergency water inlets, mechanical ballast water is introduced from the ballast system to accelerate the speed at which seawater enters the corresponding ballast tank.

10. The method as described in claim 9, characterized in that, In the initial stable state, the initial ballast seawater should be preferentially filled into the ballast tank of the floating bridge. This is to reduce the stress on the cantilever beam of the floating bridge and to reserve adjustment space for subsequent abnormal tendon tension adjustments.

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