Double-unit floating type wind power generation system of active synchronous yaw system

Abstract

The utility model provides a double-unit floating type wind power generation system of an active synchronous yaw system, relates to the technical field of wind power generation, and aims to solve the technical problems of low wind energy capturing efficiency, short service life, concentrated risk and serious accident consequence due to the fact that a floating type double-wind-power-unit system adopts a single-point mooring system for positioning in the prior art. The two wind power generation systems collect wind energy at the same time, convert the wind energy into electric energy and transmit the electric energy to an ashore variable electric field through a submarine cable, wind speed sensors of the two wind turbine generators detect the wind speeds of the two wind turbine generators respectively, the difference value of the two wind speeds is the wind thrust difference value, and then the wind thrust difference value is converted into a wind speed line. An electric signal corresponding to the wind speed line is transmitted into the main controller, the main controller controls the driving assembly to drive the shell to rotate so as to drive the two wind power generation systems to rotate synchronously until the wind turbine generator directly faces incoming flow, wind energy can be collected at the maximum efficiency, and the wind energy capturing efficiency is improved.

Description

Technical Field

[0001] This utility model relates to the field of wind power generation technology, specifically to a dual-unit floating wind power generation system with an active synchronous yaw system. Background Technology

[0002] Against the backdrop of global energy transition, offshore wind power technology is maturing, and its abundant wind energy resources have become a core driving force for the development of clean energy. In recent years, the emergence of NREL 5MW, DTU 10MW, and IEA series wind turbines signifies the continuous improvement of technology in the offshore wind power field. However, with the continuous increase in wind turbine capacity, blade length has also increased significantly, leading to a substantial increase in manufacturing, transportation, and installation difficulties, and highlighting structural safety hazards under extreme sea conditions. In contrast, small-capacity wind turbines, with their simplified blade geometry and mature manufacturing processes, not only have lower production risks but also offer more significant economic benefits. However, configuring a separate platform and mooring system for each wind turbine will significantly increase project investment and operating costs. Therefore, integrating two or more small-capacity wind turbines onto a single platform has gradually become a promising solution.

[0003] Currently, most floating dual-wind turbine systems use a single-point mooring system for positioning. The core of this system is connecting an anchor chain at the bottom of the platform to an anchor point on the seabed. Relying on the tension of the anchor chain, combined with the effects of ocean currents, waves, and wind, a torsional moment is generated when the environment changes, causing the platform to rotate. This achieves passive adjustment and attitude stability. However, when the platform has a large mass, the rotation speed is slow, making timely response impossible. While this solution is structurally simple, it is costly to construct and suitable for near-shore and medium-depth sites. It also has significant limitations: First, passive single-point mooring cannot respond in real time to sudden changes in wind direction and multi-directional wave action; the platform's yaw angle can reach tens of degrees, causing the wind turbine to be unable to continuously face the oncoming current, reducing wind energy capture efficiency by 10%–20%. Second, the anchor chain and mooring point are subjected to a high alternating load environment, making fatigue cracks prone to occur. The lifespan of critical nodes is shortened by 30%–40% compared to active systems, requiring frequent underwater inspection and replacement. Finally, once the anchor chain breaks or corrodes, the platform will lose its restraint, easily drifting or capsizing, concentrating risks and resulting in severe consequences. Utility Model Content

[0004] To address the shortcomings of existing technologies, the purpose of this utility model is to provide an active synchronous yaw system for a dual-unit floating wind power generation system, in order to solve the technical problems of existing floating dual-wind turbine systems that use a single-point mooring system for positioning, resulting in low wind energy capture efficiency, short lifespan, concentrated risks, and serious consequences of accidents.

[0005] The utility model provides a kind of double-unit floating wind power generation system of active synchronous yaw system, including:

[0006] semi-submersible platform;

[0007] a plurality of side columns are circumferentially equidistantly arranged on the semi-submersible platform, and each side column is connected with an anchor point of seabed through a mooring positioning system;

[0008] yaw system, including main controller, shell and at least one drive assembly, shell is rotatably connected to semi-submersible platform, main controller is arranged in shell, and all drive assemblies are used to drive shell rotation;

[0009] two wind power generation systems, each wind power generation system is connected with wind speed sensor, and one end of the two wind power generation systems is connected with shell, and the other end of the two wind power generation systems is obliquely upwardly inclined, and all wind power generation systems are oriented in the same direction;

[0010] all wind speed sensors and all drive assemblies are electrically connected with main controller.

[0011] After adopting the above structure, the utility model discloses a kind of double-unit floating wind power generation system of active synchronous yaw system, with the following advantages:

[0012] Two wind power generation systems simultaneously collect wind energy, and convert into electric energy and are transported to the transformer field on shore through submarine cable, the wind speed of two wind power generation systems is detected by the wind speed sensor of two wind power generation systems respectively, the difference between two wind speeds is wind force difference, then conversion into wind speed line, and the electric signal corresponding to wind speed line is transmitted to main controller, and the shell is rotated by the drive assembly driven by main controller, so that two wind power generation systems are synchronously rotated, until wind power generation system is directly opposite to incoming flow, wind energy can be collected with maximum efficiency, and wind energy capture efficiency is improved;

[0013] Two wind power generation systems are synchronously yawed, compared with independent yaw operation of each wind power generation system, aerodynamic interference between two wind power generation systems is reduced, if each wind power generation system can independently yaw, when two wind power generation systems are directly opposite to incoming flow direction, the rotor plane of front wind power generation system is shielded to rear wind power generation system, especially when it is 90 ° incoming flow, front wind power generation system is completely shielded to rear wind power generation system, so that rear wind power generation system has greater disturbance, and rear wind power generation system is prone to fatigue failure;

[0014] The main controller can actively yaw according to the wind thrust difference, compared with the single-point mooring system relying on passive environmental force to adjust the direction of the floating body, the active yaw can realize real-time closed-loop control, and has high response speed and precision.In a complex and changeable marine environment (such as sudden change of wind direction or irregular waves), the single-point mooring system is difficult to realize optimal direction adjustment, resulting in a decrease of 10%-20% in system efficiency; while the active yaw can realize active deflection with an accuracy of 0.5°, and the fixed single-point structure of the single-point mooring system causes significant stress concentration effect, and long-term bearing of alternating load is easy to cause weld fatigue cracks; in contrast, in the utility model, the plurality of side columns are connected with the seabed anchor points through the mooring positioning system to form a multi-point mooring system, the stress is more dispersed, and the direction is adjusted in real time by the active yaw operation, so that the load of the mooring positioning system is smaller, the service life is longer, and the safety factor is higher.

[0015] As an improvement, the semi-submersible platform is provided with a first gear, and all the driving assemblies are located in the shell, all the driving assemblies include a driving motor, a second gear and a fixed block, the driving motor is connected with the fixed block, the fixed block is connected with the inner wall of the shell, the output shaft of the driving motor is connected with the second gear and drives the second gear to rotate, the second gear is engaged with the first gear, and all the driving motors are electrically connected with the main controller; by adopting this structure, the main controller controls the driving motor to drive the second gear to rotate, and the second gear rotates to move circumferentially around the first gear, so that the shell is driven to rotate by the fixed block, and active yaw is realized.

[0016] As an improvement, all the driving assemblies further include a torque sensor, the torque sensor is used for monitoring the torque of the second gear, and all the torque sensors are electrically connected with the main controller; by adopting this structure, the torque sensor transmits the torque of the second gear to the main controller as a feedback, and whether the engagement movement between the second gear and the first gear is violent can be detected; when the sea waves are large, the entire power generation system is deflected, the second gear generates a movement trend opposite to its own movement state, at this time, the torque sensor detects the abnormal torque of the second gear, and the main controller controls the driving motor to rotate in the opposite direction according to the feedback information of the torque sensor, so as to prevent the damage of the gear teeth of the second gear and the first gear.

[0017] As an improvement, each driving assembly includes two fixed blocks arranged in the upper and lower positions, and each fixed block is connected with the inner wall of the shell; by adopting this structure, the connection between the driving assembly and the shell is more stable.

[0018] As an improvement, the number of driving assemblies is several, and the several driving assemblies are uniformly arranged circumferentially around the first gear; by adopting this structure, the several driving assemblies arranged around the first gear make the several second gears engage around the first gear, so that the engagement between the second gear and the first gear is more stable, and the rotation of the shell is more stable.

[0019] As improvement, the semi-submersible platform is provided with an intermediate column, the first gear is connected to the top end of the intermediate column through a connecting flange, and the outer shell is rotationally connected to the top end of the intermediate column.

[0020] As improvement, the connecting flange is provided with a connecting column at the upper end, the connecting column is provided with an annular groove at the middle part, and the first gear is arranged in the annular groove; by adopting the structure, when the second gear meshes with the first gear, the gear teeth of the second gear enter into the annular groove, and the annular groove plays a limiting role to prevent the second gear from falling off.

[0021] As improvement, the side columns are three.

[0022] As improvement, each wind power generation system further comprises a tower and a wind turbine controller, the wind turbine generator is electrically connected with the wind turbine controller, the wind turbine controller is used for controlling the wind turbine generator to pitch, the lower end of each tower is connected with the outer shell, the upper end of each tower is connected with the wind turbine generator, and the two towers are symmetrically distributed in a V shape; by adopting the structure, when the inflow wind speed is large, the wind turbine controller controls the wind turbine generator to pitch, the stress of the wind turbine generator is reduced under the condition that the power generation power is unchanged, the probability of failure of the wind turbine generator is reduced, and the electric energy generated by the wind turbine generator is transmitted to the intermediate transformer through the submarine cable; the two towers are symmetrically distributed in a V shape, the occupied space is reduced, the volume of the outer shell is reduced, the volume of the semi-submersible platform is reduced, the material consumption and construction cost are reduced, and the transverse rigidity and stability of the overall structure are improved. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 It is a schematic diagram of a three-dimensional structure of the utility model.

[0024] Figure 2 It is a sectional view of the utility model.

[0025] Figure 3 It is Figure 2 It is a local enlarged view of the middle A part.

[0026] Figure 4 It is a schematic diagram of the structure of the first gear and the second gear part in the utility model.

[0027] The drawings show that: 1, semi-submersible platform; 2, side column; 3, mooring positioning system; 4, yaw system; 41, main controller; 42, outer shell; 43, driving assembly; 431, driving motor; 432, second gear; 433, fixed block; 434, torque sensor; 5, wind power generation system; 51, wind turbine generator; 52, tower; 6, first gear; 7, intermediate column; 8, connecting flange; 9, connecting column; 10, annular groove. DETAILED DESCRIPTION

[0028] The utility model discloses a double unit floating type wind power generation system of active synchronous yaw system makes detailed instructions.

[0029] As Figures 1 to 4 The utility model discloses a double unit floating type wind power generation system of active synchronous yaw system, including semi -submersible platform 1, a plurality of side column 2, yaw system 4 and two wind power generation system 5, a plurality of side column 2 equal distance is located on semi -submersible platform 1 along the circumference, and every side column 2 all are connected with seabed anchor point through mooring positioning system 3, yaw system 4 includes main controller 41, shell 42 and at least one drive assembly 43, shell 42 is rotationally connected on semi -submersible platform 1, and main controller 41 is located in shell 42, and all drive assembly 43 are used to drive shell 42 rotation, and two wind power generation system 5 all include wind turbine generator unit 51, and every wind turbine generator unit 51 is connected with wind speed sensor, and two wind power generation system 5 one end all are connected shell 42, and two wind power generation system 5 the other end all are obliquely upwardly inclined and set, and all wind turbine generator unit 51 are towards the same, and all wind speed sensor, all drive assembly 43 are electrically connected with main controller 41.

[0030] As Figure 1 Every wind power generation system 5 still includes tower 52 and fan controller, and wind turbine generator unit 51 is electrically connected with fan controller, and fan controller is used to control wind turbine generator unit 51 variable pitch, and every tower 52 lower end all are connected shell 42, and every tower 52 upper end all are connected wind turbine generator unit 51, and two towers 52 are V type symmetrical distribution.

[0031] Wind turbine generator unit 51 and fan controller are electrically connected with submarine cable, when the incoming flow wind speed is big, fan controller controls wind turbine generator unit 51 to carry out variable pitch operation, reduces the stress of wind turbine generator unit 51 under the condition of guaranteeing that the power generation power is invariable, reduces the probability of wind turbine generator unit 51 failure, and the electric energy generated by generator is transferred to intermediate transformer through submarine cable. Two towers 52 are V type symmetrical distribution, can reduce the space occupation, thereby reducing the volume of shell 42, further reduce the volume of semi -submersible platform 1, reduce the material consumption and construction cost, improve the lateral rigidity and stability of overall structure simultaneously.

[0032] As Figure 2 And Figure 3 As shown in the drawings, first gear 6 is arranged on semi -submersible platform 1, and first gear 6 and all drive assembly 43 are located in shell 42, all drive assembly 43 include drive motor 431, second gear 432 and fixed block 433, drive motor 431 is connected with fixed block 433, fixed block 433 is connected with the inner wall of shell 42, the output shaft of drive motor 431 is connected with second gear 432 and drives second gear 432 to rotate, and second gear 432 is engaged with first gear 6, and all drive motor 431 are electrically connected with main controller 41.

[0033] All the drive assemblies 43 further comprise torque sensors 434 for monitoring the torque of the second gears 432, all the torque sensors 434 are electrically connected with the main controller 41, the torque sensors 434 monitor and feedback the torque of the second gears 432 in real time.

[0034] Each group of drive assemblies 43 comprises two fixed blocks 433, each fixed block 433 is connected with the inner wall of the shell 42, and there are several drive assemblies 43, which are evenly arranged around the first gear 6 in the circumferential direction, so several second gears 432 are also arranged around the first gear 6.

[0035] As shown in Figure 3 , the drive motor 431 is inverted, so its shell part is located at the top, and the output shaft is located at the bottom, the upper end of the shell part of the drive motor 431 is connected with one fixed block 433, the second gear 432 is coaxially arranged on the output shaft and engaged with the first gear 6, the lower end of the output shaft is connected with another fixed block 433, which is rotatably connected with the output shaft through a bearing, so that the fixed block 433 will not be rotated when the output shaft rotates, and the torque sensor 434 is connected on the output shaft, which detects the torque of the output shaft and the torque of the second gear 432.

[0036] As shown in Figure 1 , the semi-submersible platform 1 is provided with a middle column 7, and three side columns 2 are arranged around the middle column 7 in the circumferential direction, each side column 2 is connected with the seabed anchor point through a group of mooring positioning systems 3, wherein the semi-submersible platform 1 is in Y shape, and the middle column 7 is located in the middle.

[0037] As shown in Figure 3 and Figure 4 , the first gear 6 is connected to the top end of the middle column 7 through a connecting flange 8, the shell 42 is rotatably connected to the top end of the middle column 7, the connecting flange 8 is provided with a connecting column 9 at the upper end, the connecting column 9 is provided with an annular groove 10 in the middle, the first gear 6 is arranged in the annular groove 10, part of the second gears 432 and part of the two fixed blocks 433 in the drive assembly 43 are located in the annular groove 10, wherein the two fixed blocks 433 are respectively slidingly connected with the upper and lower walls of the annular groove 10, so as to prevent the drive assembly 43 from falling off.

[0038] The three groups of mooring positioning systems 3 are equally spaced in the circumferential direction, and there are three catenary lines in total, the fairleads (the main fixed position on the mooring line load platform) are located on the side of the side column 2, and the catenary mooring positioning system 3 is adopted, which can respond faster and be more accurate in the direction of the incoming flow compared with the single point mooring commonly used by double wind turbine units.

[0039] Two wind power systems 5 collect wind energy at the same time and convert it into electric energy which is transmitted to the shore through the submarine cable. Due to the changeable wind direction and wind speed in the deep sea area, the wind speed at the two wind turbine units 51 is detected by the wind speed sensors of the two wind turbine units 51 respectively. When the wind direction and wind speed change, the wind direction change is sensed by the wind turbine controller, and the difference between the two wind speeds is the wind thrust difference, which is converted into electric information and transmitted to the main controller 41. The main controller 41 controls the driving assembly 43, and the driving motor 431 drives the second gear 432 to rotate. When the second gear 432 rotates, it moves circumferentially around the first gear 6, so that the outer shell 42 is driven to rotate by the fixed block 433, thereby driving the two wind power systems 5 to rotate synchronously, so that the wind turbine units 51 can collect wind energy with maximum efficiency and improve the capture efficiency of wind energy.

[0040] The two wind power systems 5 perform synchronous yawing. Compared with independent yawing operation of each wind power system 5, the aerodynamic interference between the two wind power systems 5 is reduced. If each wind power system 5 can independently perform yawing operation, when the two wind power systems 5 are in the direction of the incoming flow, the rotor plane of the front wind turbine unit 51 will block the rear wind turbine unit 51, especially when the incoming flow is 90°, the front wind turbine unit 51 will completely block the rear wind turbine unit 51, which will cause large disturbance to the rear wind turbine unit 51 and easily cause fatigue failure of the rear wind turbine unit 51.

[0041] The main controller 41 actively performs yawing operation according to the wind thrust difference. Compared with the single point mooring system which relies on passive environmental force to adjust the direction of the floating body, active yawing can realize real-time closed-loop control, has high response speed and accuracy. In a complex and changeable marine environment (such as sudden change of wind direction or irregular waves), it is difficult for the single point mooring system to realize optimal direction adjustment, resulting in a decrease of 10%-20% in system efficiency; while the active yawing can realize active deflection with an accuracy of 0.5°, and the fixed single point structure of the single point mooring system causes significant stress concentration effect, which is easy to cause fatigue cracks in the weld under long-term alternating load. Statistics show that the fatigue life of the key nodes of the single point mooring system is shortened by 30%-40% compared with the active system, and frequent underwater detection and maintenance are required. At the same time, once the single anchor point of the single point mooring system breaks or corrodes, it will directly lead to the loss of control of the entire system.

[0042] In comparison, the plurality of side columns 2 in the utility model are connected with the seabed anchor points through the mooring positioning system 3, forming a multi-point mooring system, the stress is more dispersed, and the direction is adjusted in real time by active yaw operation, the load of the mooring positioning system 3 is smaller, the service life is longer, and the safety factor is also higher. The yaw system 4 adopts redundant design, and can reduce the failure risk to 1 / 5 of the single-point mooring system. In recent years, in the global single-point mooring system accidents, the single-point failure accounts for as high as 67%, and in strong typhoon or extreme sea conditions, the single-point mooring system lacks active anti-interference capability, and the maximum deviation angle can reach 50°, which can cause submarine cable kinking accidents, and the yaw system 4 can control the deviation angle within ± 5° through dynamic positioning, and is particularly suitable for application in the South China Sea and other sea areas where typhoons frequently occur.

[0043] In the active yaw process, the torque sensor 434 transmits the torque of the second gear 432 to the main controller 41 as a feedback quantity, whether the meshing movement between the second gear 432 and the first gear 6 is violent can be detected, when the sea waves are large, the whole power generation system will be deflected, causing the second gear 432 to produce a movement trend opposite to its own movement state, at this time the torque sensor 434 detects the abnormal torque of the second gear 432, and the driving motor 431 is controlled by the main controller 41 to rotate in the opposite direction according to the feedback information of the torque sensor 434, so as to prevent the tooth damage of the second gear 432 and the first gear 6.

[0044] The utility model evenly arranges driving assembly 43 on the shell 42 of yaw system 4, adopts modular assembly design, and each driving assembly 43 can be independently disassembled and replaced, avoids overall disassembly overhaul, not only reduces the maintenance difficulty, but also can replace the module quickly on site when failure occurs, significantly shortens the downtime; at the same time, the multiple module redundant configuration makes the remaining driving assembly 43 still work cooperatively when the single driving assembly 43 fails, ensuring that the yaw system 4 continuously operates in extreme sea conditions.

[0045] The embodiments of the utility model are described in detail above in combination with the drawings, but the utility model is not limited to the above-mentioned one embodiment, all other embodiments obtained by the person skilled in the art without making creative labor belong to the protection scope of the utility model.

Claims

1. A twin unit floating wind power system with active synchronous yaw system, characterized in that, The utility model relates to a kind of offshore wind power generation system, including: Semi-submersible platform (1); Several side columns (2) are equidistantly arranged on the semi-submersible platform (1) circumferentially, and each side column (2) is connected with seabed anchor point through mooring positioning system (3); Yaw system (4) includes main controller (41), shell (42) and at least one drive assembly (43), the shell (42) is rotatably connected to the semi-submersible platform (1), the main controller (41) is arranged in the shell (42), and all the drive assemblies (43) are used to drive the shell (42) to rotate; Two wind power generation systems (5) each include wind turbine generator unit (51), each wind turbine generator unit (51) is connected with wind speed sensor, and one end of two wind power generation systems (5) is connected with the shell (42), and the other end of two wind power generation systems (5) is inclinedly arranged upward, and all the wind turbine generator units (51) are directed to the same direction; All the wind speed sensors, all the drive assemblies (43) are electrically connected with the main controller (41).

2. The twin unit floating wind power system of the active synchronous yaw system according to claim 1, characterized in that, The semi-submersible platform (1) is provided with a first gear (6), and the first gear (6) and all the drive assemblies (43) are located in the shell (42), all the drive assemblies (43) include a drive motor (431), a second gear (432) and a fixed block (433), the drive motor (431) is connected with the fixed block (433), the fixed block (433) is connected with the inner wall of the shell (42), the output shaft of the drive motor (431) is connected with the second gear (432) and drives the second gear (432) to rotate, the second gear (432) is engaged with the first gear (6), and all the drive motors (431) are electrically connected with the main controller (41).

3. The twin unit floating wind power system of claim 2, wherein, All the drive assemblies (43) further include a torque sensor (434), the torque sensor (434) is used for monitoring the torque of the second gear (432), and all the torque sensors (434) are electrically connected with the main controller (41).

4. The twin unit floating wind power system of claim 2, wherein, Each group of drive assemblies (43) includes two upper and lower fixed blocks (433), and each fixed block (433) is connected with the inner wall of the shell (42).

5. The twin unit floating wind power system of claim 2, wherein, The number of drive assemblies (43) is several, and the several drive assemblies (43) are uniformly arranged around the first gear (6) circumferentially.

6. The twin unit floating wind power system of claim 2, wherein, The semi-submersible platform (1) is provided with an intermediate column (7), the first gear (6) is connected to the top end of the intermediate column (7) through a connecting flange (8), and the shell (42) is rotatably connected to the top end of the intermediate column (7).

7. The twin unit floating wind power system of claim 6, wherein, The connecting flange (8) is provided with a connecting column (9) at the upper end, the connecting column (9) is provided with an annular groove (10) in the middle, and the first gear (6) is arranged in the annular groove (10).

8. The twin unit floating wind power system of claim 1, wherein, The side column (2) is three.

9. The twin unit floating wind power system of claim 1, wherein, Each wind power generation system (5) further comprises a tower (52) and a wind turbine controller, the wind turbine generator (51) is electrically connected with the wind turbine controller, the wind turbine controller is used for controlling the wind turbine generator (51) to change the propeller, the lower end of each tower (52) is connected with the shell (42), the upper end of each tower (52) is connected with the wind turbine generator (51), and the two towers (52) are symmetrically distributed in a V shape.

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