Tension leg type offshore wind power platform and tendon dynamic balance adjusting method

Abstract

The invention discloses a tension leg type offshore wind power platform and a tendon dynamic balance adjusting method.The wind power platform comprises a center stand column, side buoys, a floating bridge and tendons, a plurality of ballast tanks are arranged in the floating bridge and the side buoys, and a plurality of emergency water inlets are formed in the bottom of the floating bridge and the tops and the bottoms of the side buoys; a ballast tank communicating opening which can be selectively communicated with the buoy ballast tank is formed in the lower part of the floating bridge ballast tank close to the buoy; and a ballast system is arranged in each ballast tank, and the ballast systems can be used for carrying out pressure discharge on the ballast tanks or selectively transferring water in any ballast tank to other ballast tanks. The internal ballast can be selectively adjusted through a natural flowing mode and / or a mechanical mode based on the tendon tension, the tendon failure position and the tendon failure number can be judged, an emergency control strategy is formulated according to the tendon failure condition, the service life of a mooring system is prolonged, and the safety of the mooring system is improved. And the self-storage performance of the tension leg platform can be improved when the mooring system breaks down.

Description

Technical Field

[0001] The present invention relates to the technical field of offshore floating wind power engineering, and particularly to a tension leg type offshore wind power platform and a tendon dynamic balance adjustment method. Background Art

[0002] As a renewable clean energy source, wind energy has advantages such as environmental friendliness and wide applicability. Compared with onshore wind energy, the potential of offshore wind energy resources is more prominent. With the in-depth development of offshore wind energy resources, floating wind power has gradually become a key area of research and application. Currently, the types of floating wind turbine platforms mainly 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, with a small movement amplitude caused by external loads, showing good hydrodynamic performance, and having 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. For semi-submersible and other floating wind turbines, since the buoyancy of the platform is not much different from the gravity, only large-scale drifting will occur after the mooring fails. For tension leg type floating wind turbines, the buoyancy is much greater than the gravity. After the mooring fails, the floating platform will capsize and sink due to inability to balance, resulting in more severe consequences.

[0004] The prior art generally adjusts the tendon tension by adjusting the ballast water volume in the side pontoons to reduce tendon fatigue, such as CN119590559A and CN119176209A. This method is applicable to the overall adjustment of the mooring system and is generally used for initial adjustment during installation. In the working state, discharging and filling ballast water will cause a change in the overall buoyancy, so it is not suitable for frequently changing the relative buoyancy of the platform. The prior art CN107709151A and CN115853719A disclose that multiple ballast tanks are provided in the side pontoons and the floating bridge. Although multiple ballast tanks are provided in these prior arts, the ballast tanks are relatively independent of each other and cannot cooperate to play a role to adapt to various working conditions. CN102015435A discloses that water in different strut water tanks is transferred through an active ballast system to keep the platform vertical. Although the above prior art pays attention to the adjustment of platform balance, it does not involve the control of various abnormal conditions of the tendon and cannot effectively cope with various situations during the operation of the wind power platform, especially the emergency treatment when the tendon fails.

[0005] To solve these problems, there is an urgent need to propose a method for emergency response and dynamic balance adjustment of the tendon failure of a tension leg type offshore wind power platform to improve the survival performance of the tension leg platform under mooring failure. Summary of the Invention

[0006] To solve the above technical problems, the present invention proposes a tension-leg type offshore wind power platform, which has a tendon dynamic balance adjustment system that can dynamically balance the tendons of the wind power platform. In particular, it can determine tendon failure and formulate an emergency control strategy based on the tendon failure condition, not only improving the service life of the mooring system, but also increasing the survival performance of the tension-leg platform under mooring system failures.

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

[0008] A tension-leg type offshore wind power platform, the wind power platform includes a central column, side pontoons, floating bridges, diagonal bracing members, horizontal members and tendons. The central column is located in the middle position and is used to support the wind turbine equipment. A plurality of side pontoons are evenly distributed around the central column. The side pontoons are respectively connected and fixed to the central column through a plurality of floating bridges. The height of the side pontoons is greater than the height of the floating bridges. The bottom surface of the floating bridge is flush with the bottom surface of the central column, and the top surface of the floating bridge 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 through diagonal bracing members, and each side pontoon is connected to each other through horizontal members, whereby the entire wind power platform forms a stable structure. Tendons are also provided at the bottom of the side pontoons, and the wind power platform can be anchored to the seabed through the tendons. The tendons are connected to the bottom of the side pontoons through tendon connectors. Each side pontoon is connected to two tendons. The tendon connector contains a tension monitoring component that can monitor the tendon tension.

[0009] A plurality of ballast tanks are provided inside both the floating bridges and the side pontoons, and emergency water inlets are provided at the bottom and / or the top and bottom of the floating bridges and side pontoons. At least an emergency water inlet is provided at the bottom of the ballast tank of the floating bridge closest to the side pontoon. A horizontal partition and a vertical partition are provided in the middle of the side pontoon. The interior of the side pontoon is divided into eight pontoon ballast tanks by the horizontal partition and the vertical partition, and each pontoon ballast tank is provided with an emergency water inlet.

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

[0011] A ballast tank communication port that can be selectively communicated with the upper pontoon ballast tank is provided at the lower position of the ballast tank of the floating bridge close to the side pontoon. The seawater inside the ballast tank of the floating bridge can naturally flow into the pontoon ballast tank through the ballast tank communication port. When the ballast tank communication port is opened, the seawater inside the ballast tank of the floating bridge can naturally flow into the pontoon ballast tank. In this way, the ballast weight can be transferred radially outward along the platform, increasing the ballast torque of the wind power platform.

[0012] The ballast tank is internally provided with a ballast system, which includes a sea chest, a main seawater pipe, ballast pipelines, ballast valves, ballast pumps, an outboard main pipe, a deballast pipeline, deballast valves, deballast pumps, a manifold, branch pipelines, a common pipeline, a secondary ballast pump and a secondary manifold. The ballast system can not only selectively transfer the water in any ballast tank to other ballast tanks, but also press external seawater into any ballast tank or discharge it from the ballast tank of the wind power platform.

[0013] The sea chest is located on the outer surface of the bottom of the central column. Seawater can enter the main seawater pipe through the control of the sea chest. The ballast pipelines are connected to the main seawater pipe, and ballast valves and ballast pumps are provided on the pipeline path of the ballast pipelines; the outboard main pipe is located at the top position of the inner surface of the central column. The deballast pipeline is connected to the outboard main pipe, and deballast valves and deballast pumps are provided on the pipeline path of the deballast pipeline. The water in the wind power platform can be discharged outward through the outboard main pipe.

[0014] The ballast pipelines and the deballast pipelines pass through the central column and are connected to the manifold. The manifold is arranged inside the pontoon, and the manifold is also provided with connection ports communicating with a number of branch pipelines and a common pipeline. One end of the branch pipeline is connected to the manifold, and the other ends of a number of branch pipelines are respectively connected to the pontoon ballast tanks. The secondary manifold is connected to the manifold through the common pipeline, and the common pipeline is provided with a secondary ballast pump. The secondary manifold is located inside the side pontoon, and the secondary manifold is also provided with a number of connection ports connected to secondary branch pipelines. One ends of a number of secondary branch pipelines are connected to the secondary manifold, and the other ends lead to each pontoon ballast tank. The manifold and the secondary manifold are valve group structures. Through the manifold and the secondary manifold, the pontoon ballast tanks and the pontoon ballast tanks can be selectively connected, not only the seawater can be selectively supplemented or discharged from each ballast tank, but also the water in any ballast tank can be selectively transferred to other ballast tanks.

[0015] A tendon dynamic balance adjustment method for a tension leg type offshore wind power platform. This method can selectively open the ballast tank connection ports and / or the secondary ballast pump, manifold, and secondary manifold of the ballast system to transfer the ballast water between the pontoon ballast tank and the side pontoon ballast tank; when ballasting is required, the emergency water inlet at the bottom and / or the top and bottom of the side pontoon of the pontoon can be selectively opened to allow seawater to flow naturally into the corresponding ballast tank; when it is necessary to accelerate the ballasting speed, the ballast pump, secondary ballast pump, manifold, and secondary manifold of the ballast system can be further opened for mechanical ballasting; when deballasting is required, the deballast pump, secondary ballast pump, manifold, and secondary manifold of the ballast system can be selectively opened to discharge the seawater in the corresponding ballast tank from the platform.

[0016] This method includes the following steps:

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

[0018] 2. When within a certain period of time, the fluctuation period of the continuous fluctuation of the tension data is less than the second time threshold and the fluctuation amplitude continuously exceeds the second amplitude, on the basis of opening the ballast tank connection port, the secondary ballast pump, pipe manifold, and secondary pipe manifold are further opened, so that the ballast seawater in the pontoon ballast tank is evenly and / or controllably transferred to the pontoon ballast tank.

[0019] 3. The tendon connector 71 monitors the tendon tension. When the tension of a certain tendon drops sharply and does not recover after a certain period of time, the tension of another adjacent tendon on the same side pontoon is continuously detected;

[0020] (1) If the tension of the adjacent tendon increases significantly, it is determined that the tendon has failed; in this case, the emergency water inlet at the bottom of the pontoon and / or the top and bottom of the side pontoon corresponding to the tendon failure is opened, and seawater is allowed to flow into the ballast tank naturally;

[0021] (2) If the tension of the adjacent tendon also drops sharply, it is determined that the two tendons on the same side pontoon have failed simultaneously; in this case, all the emergency water inlets of the pontoon and side pontoon and the ballast tank connection port are opened, and at the same time, the sea chest, ballast valves, ballast pumps, pipe manifolds, secondary ballast pumps, and secondary pipe manifolds of the ballast system are opened. While naturally ballasting water through the emergency water inlet, mechanical ballasting water is carried out through the ballast system.

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

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

[0024] 1. The tension leg type offshore wind power platform of the present invention has a tendon dynamic balance adjustment system, which can perform internal ballast adjustment according to the change of tendon tension, selectively adjust the internal ballast through natural flow mode and / or mechanical mode, and improve the overall anti-wind and wave torque of the platform by transferring the internal ballast water away from the central position;

[0025] 2. The tension leg type offshore wind power platform of the present invention can judge the failure position and the number of failed tendons, and formulate an emergency control strategy according to the tendon failure condition, which not only improves the service 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 type offshore wind power platform of the present invention has a variety of ballast adjustment methods. By combining different ballast adjustment methods such as internal self-adjustment, internal mechanical adjustment, external natural water intake, and external mechanical ballast water intake, the overall control and adjustment flexibility of the wind power platform is improved. BRIEF DESCRIPTION OF THE DRAWINGS

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

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

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

[0030] Figure 4 is a schematic diagram of the bottom of the overall structure of the present invention;

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

[0032] Reference numerals in the figures: 1, central column; 2, side floating pontoon; 21, horizontal partition; 22, vertical partition; 23, floating pontoon ballast tank; 3, floating bridge; 31, floating bridge ballast tank; 4, diagonal bracing member; 5, horizontal member; 6, emergency water inlet; 61, sea chest; 62, seawater main pipe; 63, ballast pipeline; 64, ballast valve; 65, ballast pump; 66, overboard main pipe; 67, deballast pipeline; 68, deballast valve; 69, deballast pump; 610, manifold; 611, branch pipeline; 612, common pipeline; 613, secondary ballast pump; 614, secondary manifold; 615, ballast tank connection port; 7, tendon; 71, tendon connector. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0033] To make the objectives, technical solutions and advantages of the present invention clearer and more understandable, the present invention will be described below through specific embodiments shown in the drawings. However, it should be understood that these descriptions are only exemplary and are not intended to limit the scope of the present invention. In addition, in the following description, the descriptions of well-known structures and technologies are omitted to avoid unnecessarily confusing the concepts of the present invention.

[0034] Combined with Figures 1-5 To illustrate this embodiment, this embodiment is a tension-leg type offshore wind power platform, as Figure 1As shown in the figure, it is a tension-leg type offshore wind power platform. The wind power platform includes a central column 1, side pontoons 2, a floating bridge 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 position and is used to support the wind turbine equipment. The number of side pontoons 2 is three, which are evenly distributed around the central column 1. The side pontoons 3 are respectively connected and fixed to the central column 1 and the three side pontoons 2 through three floating bridges 3. The height of the side pontoon 3 is greater than that of the floating bridge 3. The bottom surface of the floating bridge 3 is flush with the bottom surface of the central column 1, and the top surface of the floating bridge 3 is flush with the top surface of the side pontoon 2. In addition, the upper part of the central column 1 is connected to the top of each side pontoon 2 through diagonal bracing members 4, and the side pontoons 2 are connected to each other through horizontal members 5. After being connected by the horizontal members 5, the side pontoons 2 form an equilateral triangle, and the central column 1 is located at the center of the equilateral triangle. Thus, the entire wind power platform forms a stable base structure. Tendons 7 are also provided at the bottom of the side pontoons 2, and the wind power platform can be anchored to the seabed through the tendons 7. The tendons 7 are connected to the bottom of the side pontoons 2 through tendon connectors 71. Each side pontoon 2 is connected to two tendons 7. The tendon connector 71 contains a tension monitoring component, which can monitor the tendon tension.

[0035] As Figures 2-5 shown, multiple ballast tanks are provided inside both the floating bridge 3 and the side pontoon 2, and emergency water inlets 6 are provided at the bottom and / or the top and bottom of the floating bridge 3 and the side pontoon 2. Preferably, three floating bridge ballast tanks 31 are provided inside the floating bridge 3. The three floating bridge ballast tanks are arranged along the length direction of the floating bridge, and emergency water inlets 6 are provided at least at the bottom of the floating bridge ballast tank 31 closest to the side pontoon 2. A horizontal partition 21 and a vertical partition 22 are provided in the middle of the side pontoon 2. The interior of the side pontoon 2 is divided into eight pontoon ballast tanks 23 by the horizontal partition 21 and the vertical partition 22. An emergency water inlet 6 is provided in each pontoon ballast tank 23, that is, emergency water inlets 6 are provided at the tops of the four upper pontoon ballast tanks, and emergency water inlets 6 are provided at the bottoms of the four lower pontoon ballast tanks.

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

[0037] As Figure 2As shown in the figure, a ballast tank connection port 615 that can be selectively connected to the upper pontoon ballast tank 23 is provided at the lower position of the floating bridge ballast tank 31 near the side pontoon 2. Seawater inside the floating bridge ballast tank can naturally flow into the pontoon ballast tank through the ballast tank connection port. When the ballast tank connection port 615 is opened, seawater inside the floating bridge ballast tank 31 can naturally flow into the pontoon ballast tank 23. The ballast tank connection port 615 is in a closed state during the normal operation of the platform. In some special situations, for example, when the sea waves and winds become larger and the tendon tension distribution shows continuous fluctuations, it is necessary to increase the overall stability of the platform. At this time, the ballast tank connection port 615 is opened, so that seawater directly and naturally flows from the floating bridge ballast tank 31 into the pontoon ballast tank 23. In this way, the ballast weight can be transferred radially outward along the platform, and the ballast torque of the wind power platform increases, overcoming the influence of the waves and winds. Under the condition of constant buoyancy, this adjustment of the ballast weight position can change the wave and wind resistance ability of the wind power platform; or for another example, when the speed of mechanically increasing the ballast cannot meet the requirements, the ballast torque can be increased through natural ballast transfer.

[0038] The emergency water inlet 6 has a control switch that can control the direct entry of seawater into each ballast tank. Preferably, an auxiliary ballast pump can be provided inside the emergency water inlet 6 to increase the water inlet speed. The ballast tank contains a vent pipe connected to above the water surface of the platform. When seawater enters or exits the ballast tank, the vent pipe is selectively opened to maintain the air pressure inside the ballast tank unchanged, so that seawater can enter and exit the ballast tank, and the air pressure will not cause resistance to the water inlet or drainage of the ballast tank.

[0039] As Figure 2 As shown in the figure, a ballast system is provided inside the ballast tank. The ballast system can not only selectively transfer the ballast water of any ballast tank to other ballast tanks, but also press external seawater into any ballast tank or discharge it from the ballast tank of the wind power platform. The ballast system includes a sea chest 61, a seawater main pipe 62, a ballast pipeline 63, a ballast valve 64, a ballast pump 65, an overboard main pipe 66, a discharge pipeline 67, a discharge valve 68, a discharge pump 69, a manifold 610, a branch pipeline 611, a common pipeline 612, a secondary ballast pump 613 and a secondary manifold 614.

[0040] The sea chest 61 is located on the outer surface of the bottom of the central column 1. The seawater main pipe 62 is provided at the bottom position of the inner surface of the central column 1. The sea chest 61 is connected to the seawater main pipe 62, and seawater can enter the seawater main pipe 62 through the control of the sea chest 61. The ballast pipeline 63 is connected to the seawater main pipe 62, and a ballast valve 64 and a ballast pump 65 are provided on the pipeline path of the ballast pipeline 63; the overboard main pipe 66 is located at the top position of the inner surface of the central column 1. The discharge pipeline 67 is connected to the overboard main pipe 66, and a discharge valve 68 and a discharge pump 69 are provided on the pipeline path of the discharge pipeline 67. The water inside the wind power platform can be discharged outward through the overboard main pipe 66.

[0041] The ballast pipeline 63 and the deballast pipeline 67 pass through the central column 1 and are connected to the manifold 610. The manifold 610 is arranged inside the pontoon 3. The manifold 610 is also provided with connection ports communicating with a plurality of branch pipelines 611 and a common pipeline 612. The number of the plurality of branch pipelines 611 is equal to the number of pontoon ballast tanks. One end of each branch pipeline 611 is connected to the manifold 610, and the other ends of the plurality of branch pipelines 611 are respectively connected to the pontoon ballast tank 31. The secondary manifold 614 is connected to the manifold 610 through the common pipeline 612. The common pipeline 612 is provided with a secondary ballast pump 613. The secondary manifold 614 is located inside the side pontoon 2. The secondary manifold 614 is also provided with a plurality of connection ports connected to secondary branch pipelines. One ends of the plurality of secondary branch pipelines are connected to the secondary manifold 614, and the other ends lead to respective pontoon ballast tanks 23. The manifolds 610 and the secondary manifold 614 are valve group structures. Through the manifold 610 and the secondary manifold 614, the pontoon ballast tanks 31 and the pontoon ballast tanks 23 can be selectively connected. Not only can seawater be selectively supplemented or discharged from each ballast tank, but also the water in any ballast tank can be selectively transferred to other ballast tanks.

[0042] When the wind turbine generator is installed on the platform and towed as a whole, by adjusting the ballast water volume in the ballast tank, the waterline position of the platform is controlled to be between the top and the bottom of the pontoon 3 to facilitate towing; when the wind turbine generator reaches the working position, by adjusting the ballast water volume in the ballast tank, the waterline position of the platform is controlled to be higher than the top of the pontoon 3. After the tendon is anchored, by adjusting the ballast water volume in the ballast tank, the tendon is made to be within a reasonable tension range.

[0043] The number of the seawater main pipeline 62 and the outboard main pipeline 66 is one each, and the number of the ballast pipeline 63 and the deballast pipeline 67 is the same as the number of pontoons 3; a plurality of valve groups are arranged inside the manifold 610 and the secondary manifold 614, and the on-off of the branch pipeline 611 and the common pipeline 612 can be respectively controlled.

[0044] During ballasting of the ballast system, seawater is sucked into the seawater main pipeline 62 through the sea chest 61, the ballast pump 65 starts to work, and the seawater is distributed through the ballast pipeline 63 and flows into the manifold 610 and / or the branch pipeline 611 communicating with the pontoon ballast tank 31. The seawater in the common pipeline 612 flows into the secondary manifold 614 and is distributed to the corresponding pontoon ballast tanks through the secondary branch pipelines; during deballasting, first the ballast valve 64 is opened for ballasting, driving water is injected into the common pipeline 612 and the branch pipeline 611, then the ballast valve 64 is closed, the deballast pump 69 and the secondary ballast pump 613 are started, and the seawater in the ballast tank is transported through the deballast pipeline 67 to the outboard main pipeline 66 and discharged uniformly at the top of the central column 1.

[0045] The ballast system can work in coordination with the emergency water inlet 6 to accelerate the water inlet speed of the ballast tank. When it is necessary to reduce the overall buoyancy of the platform, that is, when ballasting is required, the emergency water inlets 6 at the bottom of the pontoon 3 and the top and bottom of the side pontoons 2 can be selectively opened, allowing seawater to flow naturally into the corresponding ballast tanks; when it is necessary to accelerate the speed of buoyancy reduction, that is, to accelerate the ballasting speed, on the basis of natural water inlet, the ballast pump 65, the secondary ballast and de-ballast pump 613, the manifold 610, and the secondary manifold 614 can be further opened, so that on the basis of natural seawater ballasting, mechanical ballasting is carried out to increase the ballasting speed and rapidly reduce the buoyancy; when it is necessary to increase the overall buoyancy of the platform, that is, during de-ballasting, the de-ballast pump 69, the secondary ballast and de-ballast pump 613, the manifold 610, and the secondary manifold 614 can be selectively opened to discharge the seawater in the corresponding ballast tanks from the platform.

[0046] A method for dynamically balancing and adjusting the tendons of a tension-leg type offshore wind power platform. This method can selectively open the ballast tank connection ports and / or the secondary ballast and de-ballast pumps, manifolds, and secondary manifolds of the ballast system to transfer the ballast water between the pontoon ballast tanks and the side pontoon ballast tanks; when ballasting is required, the emergency water inlets 6 at the bottom of the pontoon 3 and / or the top and bottom of the side pontoons 2 can be selectively opened to allow seawater to flow naturally into the corresponding ballast tanks; when it is necessary to accelerate the ballasting speed, the ballast pump 65, the secondary ballast and de-ballast pump 613, the manifold 610, and the secondary manifold 614 can be further opened for mechanical ballasting; when it is necessary to de-ballast, the de-ballast pump 69, the secondary ballast and de-ballast pump 613, the manifold 610, and the secondary manifold 614 can be selectively opened to discharge the seawater in the corresponding ballast tanks from the platform.

[0047] This method includes the following steps:

[0048] 1. Real-time monitor the overall tendon tension through the tendon connector 71. When within a certain period of time, the fluctuation period of the continuous fluctuation of the tension data is less than the first time threshold, and the fluctuation amplitude continuously exceeds the first amplitude, open the ballast tank connection port 615 to allow the ballast water in at least the pontoon ballast tank near the side pontoon to flow into the side pontoon ballast tank.

[0049] When within a certain period of time, the fluctuation period of the continuous fluctuation of the tension data is less than the first time threshold, and the fluctuation amplitude continuously exceeds the first amplitude, it is considered that there are certain winds and waves in the sea area of the wind power platform. These winds and waves will cause continuous fluctuations in the tendon tension of the wind power platform, and this tension fluctuation will affect the service life of the mooring system such as the tendons. Therefore, it is necessary to improve the overall stability of the wind power platform. That is, transfer the internal ballast water away from the center position, so that the overall anti-wind and wave torque of the platform is increased, making the platform stable and reducing the tension fluctuation.

[0050] Preferably, in the initial stable state of the wind power platform, the initial ballast seawater can be filled into the pontoon ballast tank as much as possible first. On the one hand, it reduces the stress of the pontoon cantilever beam. On the other hand, it reserves an adjustment space for subsequent abnormal tendon tension adjustment.

[0051] 2. When, within a certain period of time, the fluctuation period of the continuous fluctuation of the tension data is less than the second time threshold, and the fluctuation amplitude continuously exceeds the second amplitude, on the basis of opening the ballast tank connection port 615, the secondary ballast pump 613, the manifold 610, and the secondary manifold 614 will be further opened, so that the ballast seawater in the pontoon ballast tank is evenly and / or controllably transferred to the buoy ballast tank.

[0052] When, within a certain period of time, the fluctuation period of the continuous fluctuation 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, it is considered that there are large waves and winds in the sea area where the wind power platform is located, and it is necessary to further strengthen the overall stability of the wind power platform. At this time, selectively transfer the water in the pontoon ballast tank to the buoy ballast tank as much as possible. On the basis of natural ballast transfer, further transfer the ballast by mechanical means, so that the ballast seawater in the pontoon ballast tank is evenly and / or controllably transferred to the buoy ballast tank, making the platform more stable.

[0053] 3. The tendon connector 71 monitors the tendon tension. When the tension of a certain tendon drops sharply and does not recover after a certain period of time, continue to detect the tension of another tendon on the same side buoy.

[0054] (1) If the tension of the adjacent tendon increases significantly, it is determined that the tendon has failed; in this case, open the emergency water inlet 6 at the bottom and / or top and bottom of the pontoon 3 corresponding to the failed tendon, and let the 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 the adjacent tendon also drops sharply, it is determined that the two tendons 7 on the same side buoy 2 have failed at the same time; in this case, open all the emergency water inlets 6 of the pontoon 3 and the side buoy 2 corresponding to the failed tendons and the ballast tank connection port 615, and at the same time open the sea chest 61, the ballast valve 64, the ballast pump 65, the manifold 610, the secondary ballast pump 613, and the secondary manifold 614 of the ballast system, etc. While naturally ballasting water from the emergency water inlet, carry out mechanical ballasting water intake of the ballast system to accelerate the speed of seawater entering the ballast tank.

[0056] Preferably, through the control of the manifold 610, etc., the ballast water intake of the ballast system can be preferentially distributed into the ballast tank of the side buoy, so that more seawater flows into the buoy ballast tank 23 farther from the central column 1, quickly reducing the buoyancy of the platform and increasing the ballast torque to prevent the tension leg platform from capsizing.

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

[0058] The above is only the specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present invention should be covered by the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.

Claims

1. A tension leg type offshore 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 is connected to the plurality of side buoys respectively through a plurality of floating bridges, and the tendons are arranged at the bottom of each side buoy, characterized in that: The floating bridge and the side pontoons are both provided with a plurality of ballast tanks, the bottom of the floating bridge and the top and bottom of the side pontoons are provided with a plurality of emergency water inlets, a ballast tank connecting port which can be selectively connected with the pontoon ballast tank is provided at the lower position of the floating bridge ballast tank near the side pontoon, the seawater inside the floating bridge ballast tank can naturally flow into the pontoon ballast tank through the ballast tank connecting port, a ballast system is provided inside the ballast tank, and the ballast system can discharge the ballast tank or selectively transfer the water in any ballast tank to other ballast tanks.

2. The tension leg offshore wind power platform according to claim 1, characterized in that: The number of the side buoys and the floating bridge is three, and the upper part of the central column is connected to the top of each side buoy through a diagonal support rod; the side buoys are also connected to each other through horizontal rods to form an equilateral triangle structure.

3. The tension leg offshore wind power platform according to claim 2, characterized in that: The tendons are connected to the bottom of the side buoys via a tendon connector. The tendon connector contains a tension monitoring component. Each side buoy is connected to two tendons.

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

5. The tension leg type offshore wind power platform according to claim 4, characterized in that: The side buoy is provided with a horizontal partition and a vertical partition, and the inside of the side buoy is divided into eight buoy ballast tanks by the horizontal partition and the vertical partition, and each of the buoy ballast tanks is provided with an emergency water inlet.

6. The tension leg offshore wind power platform according to any one of claims 1 to 5, characterized in that: The ballast system includes ballast pipelines, load-discharging pipelines, ballast valves, ballast pumps, load-discharging valves, load-discharging pumps, manifolds, branch pipelines, common pipelines, secondary ballast and load-discharging pumps and secondary manifolds; the ballast pipelines and the load-discharging pipelines are connected to the manifold, the manifold is connected to the multiple branch pipelines connected to each of the floating bridge ballast tanks and the common pipeline connected to the secondary manifold, and the secondary manifold is connected to each of the buoy ballast tanks.

7. A method for adjusting the dynamic balance of tendons of a tension leg type offshore wind power platform, characterized in that: The ballast tank connection port and / or the secondary ballast discharge pump, manifold, and secondary manifold of the ballast system can be selectively opened to transfer the ballast water between the floating bridge ballast tank and the side buoy ballast tank; When ballasting is required, the emergency water inlets at the bottom of the floating bridge and / or the top and bottom of the side buoys can be selectively opened to allow seawater to flow naturally into the corresponding ballast tanks; when the ballasting speed needs to be accelerated, the ballast system can be further selectively opened for mechanical ballasting; When it is necessary to discharge the ballast, the ballast system can be selectively opened to allow the seawater in the corresponding ballast tank to be discharged from the platform.

8. The method according to claim 7, characterized in that: The method specifically comprises: (1) real-time monitoring of the overall tendon tension is performed through the tendon connector. When the tension data continuously fluctuates for a period of time that is less than a first time threshold and the fluctuation amplitude continuously exceeds a first amplitude within a certain period of time, the ballast tank communication port is opened to allow at least the ballast water in the ballast tank of the floating bridge close to the side buoy to flow into the ballast tank of the side buoy; (2) When the tension data continuously fluctuates for a period of time that is less than the second time threshold, and the fluctuation amplitude continuously exceeds the second amplitude within a certain period of time, the secondary ballast pump, manifold, and secondary manifold are further opened on the basis of opening the ballast tank connecting port, so that the ballast seawater in the floating bridge ballast tank is transferred to the buoy ballast tank.

9. The method according to claim 8, characterized in that The method further comprises: (3) When the tension of a tendon decreases sharply and does not recover after a certain period of time, continue to test the tension of another tendon on the same side of the buoy; If the tension of the adjacent tendons increases significantly, the tendons are deemed to have failed. In this case, the emergency water inlets at the bottom of the pontoon and / or the top and bottom of the side buoys corresponding to the failed tendons are opened to allow seawater to flow naturally into the ballast tanks. If the tension of adjacent tendons also decreases sharply, it is deemed that the two tendons of the same side buoy fail at the same time; in this case, open all the emergency water inlets and ballast tank connecting ports of the floating bridge and side buoy corresponding to the failed tendons, and open the ballast system at the same time. While water is naturally ballasted in from the emergency water inlet, the ballast system is mechanically ballasted to speed up the speed at which seawater enters the corresponding ballast tanks.

10. The method according to claim 9, characterized in that When the wind power platform is in an initial stable state, the initial ballast seawater should be filled into the floating bridge ballast tank first, on the one hand to reduce the stress of the floating bridge cantilever beam, and on the other hand to reserve adjustment space for subsequent abnormal adjustment of tendon tension.

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