Wind wave and flow comprehensive power generation device based on novel semi-submersible floating platform

Abstract

The invention discloses a wind wave and flow comprehensive power generation device based on a novel semi-submersible floating platform. The wind wave and flow comprehensive power generation device comprises a wind power generation device, the semi-submersible floating platform, a wave energy absorbing device, a tidal current energy power generation device and a catenary type mooring device. The wind power generation device is arranged above the semi-submersible floating platform, the tidal current energy power generation device is arranged below the semi-submersible floating platform, and the wave energy absorption device is arranged on a truss supporting structure of the semi-submersible floating platform; the upper end of the catenary mooring is fixed to a buoy of the semi-submersible floating platform, and the lower end of the catenary mooring is fixed to a seabed through an anchor structure. According to the integrated power generation device, integrated power generation is achieved through combination of wind energy, wave energy and tidal current energy, wave energy power generation and tidal current energy power generation are increased on the basis of offshore wind power generation while the ocean utilization area is not increased, the energy output of a unit sea area can be increased, and economic benefits are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of utilization of marine renewable energy, and in particular to a wind-wave-current integrated power generation device based on a novel semi-submersible floating platform. Background Art

[0002] At present, my country's development of offshore clean energy is mainly based on wind power generation. Offshore wind turbines can be divided into two types: bottom-fixed wind turbines and floating wind turbines. Generally, bottom-fixed wind turbines are used in offshore areas, and floating wind turbines are used when the water depth exceeds 60m. Compared with bottom-fixed wind turbines in offshore areas, deep-sea floating wind turbines have a wider space to build large-scale wind farms and are easy to generate large-scale economic benefits. At present, the energy utilization mode of the offshore new energy industry is relatively single. Therefore, the development of integrated comprehensive power generation of multiple energy sources is an important direction for the future development of offshore energy. By comprehensively developing different renewable energy sources, the installation cost can be effectively reduced and the energy output per unit sea area can be increased. In particular, with the further development of deep-sea energy, we need to develop more efficient and reliable technologies, improve the comprehensive utilization rate of marine resources and the stability of power generation equipment, so as to achieve the diversification and sustainable development of offshore energy.

[0003] The research, development and application of ocean energy power generation technology face many technical challenges, such as harsh marine environment, influence of marine organisms, poor system stability and other problems. In addition, the current construction and operation costs of ocean energy power generation devices are high, making it difficult for ocean energy power generation to compete economically with traditional power generation methods; the application of ocean energy power generation technology is restricted by factors such as the geographical environment, and its scope of use is limited. For example, the construction and maintenance costs of tidal power generation devices are high, and the energy density is not high, the stability is poor, and the distribution is uneven, all of which increase the difficulty of ocean energy development.

[0004] There are some shortcomings in the existing offshore power generation devices. The research and development and application of offshore power generation devices face many technical difficulties, such as harsh marine environment, influence of marine organisms, poor system stability and other problems; in addition, floating equipment needs to have high requirements such as corrosion resistance, low density, resistance to frost heave, resistance to wind and waves, life span and carrying capacity. Summary of the invention

[0005] The purpose of the present invention is to overcome the defects of the prior art and provide a wind, wave and current integrated power generation device based on a new type of semi-submersible floating platform, which utilizes the integrated power generation of multiple energy sources such as wind energy, wave energy and tidal energy. Without increasing the ocean utilization area, it relies on the offshore wind power generation foundation, increases wave energy generation and tidal energy generation, can increase the energy output per unit sea area, and improves the economic benefits.

[0006] The object of the present invention is achieved as follows: a wind, wave and current integrated power generation device based on a novel semi-submersible floating platform comprises a wind power generation device, a semi-submersible floating platform, a wave energy extraction device, a tidal current power generation device and a catenary mooring; the wind power generation device is arranged above the semi-submersible floating platform, a tidal current power generation device is arranged below the semi-submersible floating platform, and the wave energy extraction device is arranged on the truss support structure of the semi-submersible floating platform; the upper end of the catenary mooring is fixed on the buoy of the semi-submersible floating platform, and the lower end is fixed on the seabed through an anchor structure.

[0007] As a further limitation of the present invention, the wind turbine power generation device includes wind turbine blades, a wind turbine nacelle and a wind turbine tower; the wind turbine blades are installed on the wind turbine nacelle, and the wind turbine nacelle is fixed on the wind turbine tower; the bottom end of the wind turbine tower is installed on the central column of the semi-submersible floating platform.

[0008] In order to reasonably distribute and transfer wind and wave loads and ensure the stability of the overall device, the semi-submersible floating platform includes a central column, a truss support structure, a buoy and a base column; the truss support structure includes four cross trusses and two parallel trusses; one end of the cross truss is connected to the central column, and the other end is connected to the buoy; both ends of the parallel truss are connected to the buoy; the base column is installed at the bottom of the buoy.

[0009] In order to suppress the pitch and roll motion of the semi-submersible floating platform, the wave energy absorption device includes an end plate, an impeller, a fixed shaft and end plate reinforcement ribs; the two ends of the impeller are connected with end plates, the fixed shaft is evenly arranged between the end plates at both ends of each group of impellers, the upper end of the fixed shaft is connected to the truss support structure, and the lower end is connected to the outer wall of the rotating shaft of the wave energy absorption device; the end plate reinforcement ribs are arranged on the outer plate surface of the end plate, and the arrangement direction of the end plate reinforcement ribs is radially extended along the impeller rotating shaft.

[0010] In order to achieve the function of absorbing energy, the impeller (8-2) is a Savonius type impeller, which consists of two semi-cylindrical blades symmetrically installed on both sides of the rotating shaft, with the cylindrical surfaces facing opposite directions.

[0011] As a further limitation of the present invention, the tidal energy power generation device includes a tidal energy turbine and a turbine support shaft; the tidal energy turbine is connected to the central column through the vertical support shaft of the turbine support shaft; the tidal energy turbine is installed at both ends of the horizontal support shaft of the turbine support shaft.

[0012] As a further limitation of the present invention, the tidal energy turbine comprises a turbine housing and turbine blades; the turbine blades are arranged at the front end of the turbine housing.

[0013] In order to increase the reliability of the device, the turbine support shaft includes a vertical support shaft, a horizontal support shaft and support shaft reinforcement ribs; the lower end of the vertical support shaft is connected to the horizontal support shaft, and a support shaft reinforcement rib is provided at the connection between the vertical support shaft and the horizontal support shaft.

[0014] The present invention adopts the above technical solution, and compared with the prior art, the beneficial effects are as follows: the semi-submersible floating platform in the present invention has a four-buoy design with better stability and three-dimensional space utilization compared to the traditional three-buoy floating platform, which not only provides effective support for wind power generation devices and tidal power generation devices, but also provides utilization space for wave energy absorption devices, realizing the comprehensive utilization of the structural platform. Through the combination of cross trusses and parallel trusses, the central column is connected to the buoy. This structural design not only plays a supporting and fixing role, but also can effectively transfer loads in different directions to the main structure of the platform, effectively and reasonably distribute wind, waves or other unbalanced loads, and ensure overall stability.

[0015] The catenary mooring extends outward in a divergent manner, connecting the buoy of the floating platform with the seabed. This type of buoy catenary mooring can be used in different weather conditions and different water depths. It can not only ensure that the platform floats stably on the sea surface, but also facilitates the early installation and relocation and later inspection and maintenance. It has a wide range of applicability.

[0016] The wave energy harvesting device relies on a semi-submersible floating platform. The main body adopts Savonius impellers and is arranged in an array. This impeller has a simple structure and a small starting torque. It can effectively capture waves from any direction and reduce them, which is beneficial to reduce the impact of waves on the overall device and resist the pitch and roll moments of the overall device caused by waves, thereby improving the stability of the semi-submersible floating platform.

[0017] The main body of the tidal energy power generation device is two double-blade tidal energy turbines. The turbine blades adopt a horizontal axis two-blade design. Compared with multi-blades, double blades have the advantages of simple structure and low manufacturing cost, and the torque fluctuation of double blades is small, which helps to reduce the fluctuation of power output and provide a more stable power supply. The configuration of two turbine blades rotating in opposite directions can improve the ability of the turbine to adapt to complex water flow environments, effectively reduce mechanical vibrations, and balance torque loads, thereby improving the overall stability and energy capture capabilities of the tidal energy power generation device. The support shaft of the tidal energy turbine has a streamlined surface, which can reduce the impact of ocean currents on structural stability.

[0018] The present invention utilizes integrated power generation combining wind energy, wave energy and tidal energy. Without increasing the utilization area of ​​the ocean, it relies on the offshore wind power generation foundation to increase wave energy generation and tidal energy generation, which can increase the energy output per unit sea area, improve the economic benefits, and also improve the situation of a single form of offshore energy utilization. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is an axonometric diagram of the overall structure of the present invention.

[0020] Figure 2 It is a top view of the overall structure of the present invention.

[0021] Figure 3 It is a partial enlarged view of the wave energy absorption device in the present invention.

[0022] Figure 4 It is a schematic structural diagram of the wave energy absorption device in the present invention.

[0023] Figure 5 It is a partial enlarged view of the tidal energy turbine and the turbine support shaft in the present invention.

[0024] Among them, 1 wind turbine blades; 2 wind turbine nacelle; 3 wind turbine tower; 4 central column; 5 truss support structure; 6 buoy; 7 base column; 8 wave energy absorption device; 8-1 end plate; 8-2 impeller; 8-3 fixed shaft; 8-4 end plate reinforcement; 9 tidal energy turbine; 9-1 turbine housing; 9-2 turbine blades; 10 turbine support shaft; 10-1 vertical support shaft; 10-2 horizontal support shaft; 10-3 support shaft reinforcement; 11 catenary mooring. DETAILED DESCRIPTION

[0025] like Figure 1-2 A wind-wave-current integrated power generation device based on a novel semi-submersible floating platform is shown, comprising a wind power generation device, a semi-submersible floating platform, a wave energy extraction device 8, a tidal current power generation device and a catenary mooring 11; the wind power generation device is arranged above the semi-submersible floating platform, a tidal current power generation device is arranged below the semi-submersible floating platform, and the wave energy extraction device 8 is arranged on the truss support structure 5 of the semi-submersible floating platform; the upper end of the catenary mooring 11 is fixed on the buoy 6 of the semi-submersible floating platform, and the lower end is fixed to the seabed through an anchor structure; The wind turbine generator comprises a wind turbine blade 1, a wind turbine nacelle 2 and a wind turbine tower 3; the wind turbine blade 1 is mounted on the wind turbine nacelle 2, the wind turbine nacelle 2 is fixed on the wind turbine tower 3; the bottom end of the wind turbine tower 3 is mounted on the central column 4 of the semi-submersible floating platform.

[0026] The offshore wind energy is captured by the wind turbine blades 1, then converted into electrical energy through the gearbox, drive shaft, generator and other systems in the wind turbine nacelle 2, and then transported through the cables installed in the wind turbine tower 3. The wind turbine power generation device uses medium-sized wind turbines with complete manufacturing processes and design performance that meet the specifications. The wind turbine is hoisted by a large hoisting ship. When hoisting, the offshore waves and the stability of the engineering ship must be considered to ensure safe and accurate hoisting. The cable is laid by an underwater cable laying ship. When laying, the quality and laying method of the cable must be considered to ensure the reliability and safety of power transmission.

[0027] The semi-submersible floating platform includes a central column 4, a truss support structure 5, a buoy 6 and a base column 7; the truss support structure 5 includes four cross trusses and two parallel trusses; the cross trusses are welded between the central column 4 and the buoys 6, and the parallel trusses are welded between the two buoys 6, forming a spatial structure of the semi-submersible floating platform, which not only ensures the connection and fixing functions, but also reasonably distributes unbalanced loads such as wind and waves, which is conducive to maintaining the stability of the overall structure. The buoys 6 are hollow cylinders, which are evenly distributed around the central column 4, and the horizontal and vertical spacings between the buoys are equal. While the floating platform relies on the buoys 6 to obtain buoyancy, it can also maintain the stability of the platform by injecting seawater into the buoys. The base column 7 is installed at the bottom of the buoy 6; the base column 7 is solid and has a larger diameter than the buoy 6, which can effectively lower the center of gravity of the floating platform and help resist the vertical, horizontal, rolling and pitching movements of the floating platform.

[0028] The top view of the entire semi-submersible floating platform presents an "8"-shaped structure composed of straight lines. The central column 4 is located in the center of the floating platform and serves as the main supporting structure to support the wind power generation device above and the tidal power generation device below. On the parallel trusses of the truss support structure 5, the wave energy absorption device 8 is evenly arranged. The device consists of ten sets of coaxial Savonius rotors, with five sets arranged on one truss.

[0029] like Figure 3-4 As shown, the wave energy absorption device 8 includes an end plate 8-1, an impeller 8-2, a fixed shaft 8-3 and an end plate reinforcement rib 8-4; both ends of the impeller 8-2 are connected to the end plates 8-1, and the fixed shaft 8-3 is evenly arranged between the end plates 8-1 at both ends of each group of impellers 8-2. The upper end of the fixed shaft 8-3 is connected to the truss support structure 5, and the lower end is connected to the outer wall of the rotating shaft of the wave energy absorption device 8; the end plate reinforcement rib 8-4 is arranged on the other side of the end plate 8-1 that is not connected to the impeller 8-2, and the setting direction of the end plate reinforcement rib 8-4 is radially extended along the impeller rotating shaft; the impeller 8-2 is a Savonius type impeller, which consists of two semi-cylindrical blades symmetrically installed on both sides of the rotating shaft, with the cylindrical surfaces facing opposite directions; its design allows the flow direction to be perpendicular to the rotation center axis of the impeller.

[0030] The impeller 8-2 rotates on a fixed axis under the impelling force of the waves. When the impeller rotates, the waves do positive work on the concave surface of the blades and negative work on the convex surface of the blades. The fluid work loss is large, thereby weakening the mechanical energy of the waves and helping to reduce the pitch and roll motion of the semi-submersible floating platform. The end plate 8-1 is connected to both ends of the impeller 8-2, which helps to reduce the flow velocity on the back of the impeller, thereby reducing the negative torque and improving the efficiency of the impeller. The fixed shaft 8-3 is evenly arranged between the end plates at both ends of each group of impellers, the upper end is welded to the truss support structure 5, and the lower end is welded to the outer wall of the rotating shaft of the wave energy absorption device 8, which plays a supporting and reinforcing role. The end plate reinforcement rib 8-4 is arranged on the surface of the other side of the end plate 8-1 that is not connected to the impeller, and the direction is extended along the radial direction of the impeller rotating shaft, which can disperse the load and reduce the local stress, and improve the structural rigidity and anti-deformation ability of the end plate and bolt connection. The wave energy absorbing device 8 converts its own kinetic energy into electrical energy through the internal mechanical transmission structure. Four small generators are placed in the upper space of the buoy 6 of the semi-submersible floating platform, and power is transmitted through cables. The energy absorbing device generates electricity by wave resistance, which weakens the impact of waves on the overall structure.

[0031] like Figure 5 As shown, the tidal current energy power generation device includes a tidal current energy turbine 9 and a turbine support shaft 10; the tidal current energy turbine 9 is connected to the central column 4 through a vertical support shaft 10-1 of the turbine support shaft 10; the tidal current energy turbine 9 is installed at both ends of a horizontal support shaft 10-2 of the turbine support shaft 10; the tidal current energy turbine 9 includes a turbine housing 9-1 and turbine blades 9-2; the turbine blades 9-2 are arranged at the front end of the turbine housing 9-1; The two-blade design of the horizontal support shaft 10-2 can be optimized from the wind turbine blades. It needs to have good hydrodynamic characteristics and cavitation performance. The blade surface must have certain anti-fouling and anti-algae capabilities to maintain smoothness and work efficiency and extend the service life of the blades. The rotation directions of the two turbine blades are set in opposite directions, which can improve the energy capture efficiency of the turbine in a complex flow field, while reducing vibration, balancing torque, and enhancing overall stability. The interior of the turbine housing 9-1 is used to place mechanical systems, including transmission shafts, couplings, generators, mechanical seals and other devices, which can be prefabricated in the factory to achieve standardized manufacturing processes.

[0032] The turbine support shaft 10 includes a vertical support shaft 10-1, a horizontal support shaft 10-2 and a support shaft reinforcement rib 10-3; the lower end of the vertical support shaft 10-1 is connected to the horizontal support shaft 10-2, the vertical support shaft 10-1 is a cylindrical column, connected to the central column 4 at the top, and connected to the horizontal support shaft 10-2 at the bottom, the horizontal support shaft 10-2 is a horizontal column with a narrow elliptical longitudinal section, and the narrow shape can better support the tidal energy turbine 9, and can also reduce the impact of ocean currents on the structure. The support shaft reinforcement rib 10-3 is set at the connection between the vertical support shaft 10-1 and the horizontal support shaft 10-2, which can not only strengthen the welding point and reduce the deformation of the support shaft, but also ensure the strength and rigidity without increasing the wall thickness of the support shaft. The surface of the tidal energy power generation device uses corrosion-resistant and leak-proof coatings to cope with environmental challenges such as tidal currents and salt spray corrosion, and improve the reliability of the operation of the device.

[0033] An inverter and a transformer substation are installed in the wind turbine tower 3 to integrate the electric energy generated by the wave energy absorption device 8 and the tidal energy turbine 9 into the underwater submarine cable for wind power generation, and then transmit the generated electric energy to the power grid with the help of facilities such as a booster station.

[0034] The catenary mooring 11 is used to connect the semi-submersible floating platform with the seabed. The upper end is fixed on the buoy 6 of the semi-submersible floating platform. Each buoy is provided with a mooring point. The lower end is fixed to the seabed through an anchor structure, and the weight of the anchor and the friction of the seabed soil are used to provide the necessary pre-tension. The catenary mooring 11 is distributed centrally and symmetrically about the normal line of the semi-submersible floating platform. This symmetrical layout ensures the balance and stability of the entire device, while improving the ability of the entire device to resist waves and turbulence, and is also convenient for displacement and maintenance.

[0035] The present invention is not limited to the above-mentioned embodiments. On the basis of the technical solution disclosed in the present invention, technicians in this field can make some substitutions and deformations to some technical features therein according to the disclosed technical content without creative labor, and these substitutions and deformations are all within the protection scope of the present invention.

Claims

1. A wind-wave-current integrated power generation device based on a novel semi-submersible floating platform, characterized in that: The invention comprises a wind power generation device, a semi-submersible floating platform, a wave energy extraction device (8), a tidal energy generation device and a catenary mooring (11); the wind power generation device is arranged above the semi-submersible floating platform, the tidal energy generation device is arranged below the semi-submersible floating platform, and the wave energy extraction device (8) is arranged on the truss support structure (5) of the semi-submersible floating platform; the upper end of the catenary mooring (11) is fixed to the buoy (6) of the semi-submersible floating platform, and the lower end is fixed to the seabed through an anchor structure.

2. A wind-wave-current integrated power generation device based on a novel semi-submersible floating platform according to claim 1, characterized in that: The wind turbine power generation device comprises a wind turbine blade (1), a wind turbine nacelle (2) and a wind turbine tower (3); the wind turbine blade (1) is mounted on the wind turbine nacelle (2), and the wind turbine nacelle (2) is fixed on the wind turbine tower (3); the bottom end of the wind turbine tower (3) is mounted on a central column (4) of a semi-submersible floating platform.

3. The wind-wave-current integrated power generation device based on a novel semi-submersible floating platform according to claim 1 is characterized in that: The semi-submersible floating platform comprises a central column (4), a truss support structure (5), a buoy (6) and a base column (7); the truss support structure (5) comprises four cross trusses and two parallel trusses; one end of the cross truss is connected to the central column (4), and the other end is connected to the buoy (6); both ends of the parallel truss are connected to the buoy (6); and the base column (7) is installed at the bottom of the buoy (6).

4. The wind-wave-current integrated power generation device based on a novel semi-submersible floating platform according to claim 1 is characterized in that: The wave energy absorption device (8) comprises an end plate (8-1), an impeller (8-2), a fixed shaft (8-3) and an end plate reinforcement rib (8-4); the two ends of the impeller (8-2) are connected to the end plates (8-1); the fixed shaft (8-3) is evenly arranged between the end plates (8-1) at the two ends of each group of impellers (8-2); the upper end of the fixed shaft (8-3) is connected to the truss support structure (5), and the lower end is connected to the outer wall of the rotating shaft of the wave energy absorption device (8); the end plate reinforcement rib (8-4) is arranged on the outer plate surface of the end plate (8-1), and the arrangement direction of the end plate reinforcement rib (8-4) is extended along the radial direction of the impeller rotating shaft.

5. The wind-wave-current integrated power generation device based on a novel semi-submersible floating platform according to claim 4 is characterized in that: The impeller (8-2) is a Savonius type impeller, which consists of two semi-cylindrical blades symmetrically installed on both sides of the rotating shaft, with the cylindrical surfaces facing opposite directions.

6. The wind-wave-current integrated power generation device based on a novel semi-submersible floating platform according to claim 1 is characterized in that: The tidal current energy power generation device comprises a tidal current energy turbine (9) and a turbine support shaft (10); the tidal current energy turbine (9) is connected to a central column (4) via a vertical support shaft (10-1) of the turbine support shaft (10); and the tidal current energy turbine (9) is mounted at both ends of a horizontal support shaft (10-2) of the turbine support shaft (10).

7. A wind-wave-current integrated power generation device based on a novel semi-submersible floating platform according to claim 6, characterized in that: The tidal current energy water turbine (9) comprises a water turbine housing (9-1) and water turbine blades (9-2); the water turbine blades (9-2) are arranged at the front end of the water turbine housing (9-1).

8. The wind-wave-current integrated power generation device based on a novel semi-submersible floating platform according to claim 6 is characterized in that: The turbine support shaft (10) comprises a vertical support shaft (10-1), a horizontal support shaft (10-2) and a support shaft reinforcement rib (10-3); the lower end of the vertical support shaft (10-1) is connected to the horizontal support shaft (10-2), and a support shaft reinforcement rib (10-3) is provided at the connection between the vertical support shaft (10-1) and the horizontal support shaft (10-2).

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