Flow-induced vibration type wave energy power generation device and floating fan combined power generation platform

Abstract

The invention discloses a flow-induced vibration type wave energy power generation device and a floating type fan combined power generation platform, the power generation device is provided with a shell capable of generating pitching, yawing and up-down shaking under the action of sea waves, and a plurality of layers of annular permanent magnet poles are distributed on the inner side face of the shell at intervals; the permanent magnet pole distribution mode meets the magnetic pole distribution rule that the vertical direction becomes strong from top to bottom, and the radial direction becomes maximum from the axis to the inner side of the shell from the minimum value; a conductive rod is arranged at the axis of the shell; a plurality of conductive coils are distributed on the conductive rod at intervals; when the power generation device moves up and down along with the up-and-down movement of waves and the flowing of ocean currents and moves up and down and vibrates and gallops due to currents, the relative positions of the permanent magnet poles and the conductive coils are driven to change, and magnetic flux changes are generated in the conductive coils, so that currents are generated. The power generation device serves as a floating body structure and is combined with the combined power generation platform provided by the floating fan, the power generation efficiency of the offshore wind power floating platform can be improved, the cost of the offshore wind power platform is reduced, and the stability of the floating platform is improved.

Description

Technical Field

[0001] The present invention relates to the field of wave energy and offshore wind energy utilization, and in particular to a flow-induced vibration wave energy power generation device and a floating wind turbine combined power generation platform. Background Art

[0002] The existing flow-induced vibration power generation device is mainly designed for recovering ocean current energy for power generation underwater, and is not suitable for recovering wave energy for power generation. In addition, the existing flow-induced vibration power generation device has high requirements for the stability of the support. On the other hand, in recent years, offshore wind power construction in deep sea areas has been large in scale and wide in scope, among which floating wind power is the main structure. In order to improve the competitiveness of floating wind power, other power generation equipment will be arranged on the floating platform, and the cost of the floating wind power platform will be reduced through the mode of joint power generation. However, with the action of wind, waves and currents, the floating platform will produce oscillations, swaying and other movements, and its support function has low stability. The existing flow-induced vibration power generation device is not suitable for floating wind turbine platforms. Summary of the invention

[0003] Purpose of the invention: The first purpose of the present invention is to provide a flow-induced vibration wave energy power generation device that can simultaneously utilize the up and down fluctuations of waves and the mechanical vibration energy perpendicular to the direction of the ocean current to generate electricity; the second purpose of the present invention is to provide a power generation platform that combines the flow-induced vibration wave energy power generation device and a floating wind turbine.

[0004] Technical solution: A flow-induced vibration wave energy power generation device of the present invention comprises a housing, a base, a conductive rod and a lower housing, wherein the base and the lower housing are hollow inside, the base is fixed to the upper end of the lower housing, and the lower housing is provided with power equipment and a servo control system;

[0005] The shell is connected to the ring on the base through a flexible connector, and the ring can rotate clockwise and counterclockwise around the central axis of the device under the drive of the power device of the servo control system; the flexible connector is made of corrosion-resistant and waterproof flexible materials, and the shell can pitch and yaw and shake up and down under the action of waves;

[0006] The ring adjusts and rotates according to the direction of the ocean current, driving the shell to rotate at a specified angle, actively controlling the direction of the shell and the wave flow;

[0007] Several layers of annular permanent magnetic poles are distributed at intervals on the inner side of the shell. The distribution of the permanent magnetic poles meets the magnetic pole distribution law, vertically from weak to strong from top to bottom, and radially from the axis to the inner side of the shell from the minimum value to the maximum value; the lower end of the conductive rod passes through the base and the lower shell, and is fixed to the bottom surface of the lower shell; the upper end of the conductive rod passes through the shell and is placed at the axis of the shell, and several conductive coils are distributed at intervals on the conductive rod; a gap is reserved between each layer of conductive coils and each permanent magnetic pole to ensure relative movement between the conductive coil and the permanent magnetic pole;

[0008] When the flow-induced vibration wave energy power generation device moves up and down with the up and down movement of waves and the flow of ocean currents, and vibrates and gallops due to flow, the relative position of the permanent magnet pole and the conductive coil changes, and the magnetic flux changes inside the conductive coil, thereby generating current, which is transmitted by the conductive rod to the power equipment in the lower shell.

[0009] Furthermore, multiple springs are radially distributed on the conductive coil, and the conductive coil on the top of the conductive rod is vertically distributed with the spring. The outer diameter end of the spring is free and there is a certain gap with the inner side of the shell. The elastic stiffness of the spring increases nonlinearly with the compression deformation. When the conductive rod and the shell move relative to each other, the spring resists the movement of the shell, and its elastic modulus increases rapidly with the increase of the compression deformation, thereby avoiding the frequency locking phenomenon.

[0010] Furthermore, the mass of the permanent magnetic pole layer increases vertically from top to bottom to lower the center of gravity of the device.

[0011] The present invention can utilize the low-speed and high-speed energy of wave flow through the setting of nonlinear springs and special mass arrangement, thereby expanding the sensitive range of the device to the dynamic frequency.

[0012] Furthermore, the interior of the base is a waterproof structure that divides a plurality of compartments, and the interior of the lower shell is also a waterproof structure that divides a plurality of compartments. The compartments serve as equipment compartments or ballast compartments to lower the center of gravity of the device.

[0013] Furthermore, the flow-induced vibration wave energy power generation device is a cylindrical structure or a rectangular structure.

[0014] A floating wind turbine combined power generation platform of the present invention is a semi-submersible or tension leg structure, comprising one or more floating wind turbines and one or more flow-induced vibration wave energy power generation devices; the floating wind turbine structure and the base and lower shell of each flow-induced vibration wave energy power generation device are fixedly connected to each other through a supporting structure to form a floating platform; the flow-induced vibration wave energy power generation device acts as a floating structure, so that the overall buoyancy center of the structure is above the overall center of gravity; while the floating wind turbine is generating wind power, the flow-induced vibration wave energy power generation device generates electricity by utilizing the up and down fluctuations of waves and mechanical vibration energy perpendicular to the direction of the ocean current, and after being processed by the power equipment inside the lower shell, it is connected to the power transmission equipment on the floating wind turbine through the wires on the supporting structure.

[0015] Furthermore, each corner of the floating platform is provided with only one flow-induced vibration wave energy power generation device, and the anchor cable is connected to the base.

[0016] Furthermore, each corner of the floating platform is provided with a plurality of the flow-induced vibration wave energy power generation devices, and the plurality of the flow-induced vibration wave energy power generation devices are reinforcedly connected to each other. Meanwhile, the central nodes of the plurality of the flow-induced vibration wave energy power generation devices are fixedly connected to the floating wind turbine structure through a supporting structure, and the anchor cable is connected to the central node.

[0017] Furthermore, one or more side wings are distributed on the shell of the flow-induced vibration wave energy power generation device, and the side wings are used to change the movement path of the ocean current.

[0018] Furthermore, the outer shell and the side wings are connected by nodes, and the nodes are connected to the power device of the servo control system. The nodes can make the side wings rotate under the drive of the power device of the servo control system, driving the side wings to open to a specified angle; by adjusting the rotation angle of the outer shell and the angle of the side wings, the forces generated by each of the devices on the platform offset each other, thereby improving the stability of the floating platform.

[0019] Beneficial effects: Compared with the prior art, the present invention has the following significant advantages: the flow-induced vibration wave energy power generation device provided by the present invention can generate electricity by utilizing the up and down fluctuations of waves and the mechanical vibration energy perpendicular to the direction of the ocean current, and effectively utilize the energy of wave flow to generate electricity; further, the flow-induced vibration wave energy power generation device is used as a floating structure, and a combined power generation platform is provided in combination with a floating wind turbine. On the one hand, it can improve the power generation efficiency of the offshore wind power floating platform by more than 20%, reduce the cost of the offshore wind power platform, and solve the problem of improving the power generation efficiency in the deep sea; on the other hand, it also improves the stability of the floating platform. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a cross-sectional view of a flow-induced vibration wave energy power generation device provided by an embodiment of the present invention;

[0021] Figure 2 yes Figure 1 AA and BB cross-sections of the

[0022] Figure 3 1 is a schematic structural diagram of a circular flow-induced vibration wave energy power generation device without side wings in an embodiment of the present invention;

[0023] Figure 4 1 is a schematic structural diagram of a rectangular flow-induced vibration wave energy power generation device without side wings in an embodiment of the present invention;

[0024] Figure 5 It is a schematic structural diagram of a rectangular flow-induced vibration wave energy power generation device with side wings in an embodiment of the present invention;

[0025] Figure 6 is a cross-sectional view at different heights of a rectangular flow-induced vibration wave energy power generation device with side wings in an embodiment of the present invention;

[0026] Figure 7 1 is a schematic structural diagram of a semi-submersible floating wind turbine combined power generation platform according to an embodiment of the present invention;

[0027] Figure 8 It is a structural schematic diagram of a tension leg type floating wind turbine combined power generation platform in an embodiment of the present invention. DETAILED DESCRIPTION

[0028] The present invention will be further described below in conjunction with the accompanying drawings.

[0029] Attached Figures 1 to 8 The reference numerals in the figures are as follows:

[0030] 1. Floating wind turbine; 2. Floating platform; 21. Flow-induced vibration wave energy power generation device; 211. Casing; 2112. Permanent magnet pole; 212. Side wing; 213. Flexible connector; 214. Base; 2141. Ring; 215. Spring; 216. Conductive coil; 217. Conductive rod; 22. Lower shell; 23. Support structure; 3. Anchor cable.

[0031] like Figures 1 to 3 As shown, an embodiment of the present invention provides a flow-induced vibration wave energy power generation device, including a shell 211, a base 214, a conductive rod 217 and a lower shell 22. The shell 211 is made of high-strength, corrosion-resistant, non-ferromagnetic material, and the surface of the shell 211 is sprayed with anti-corrosion paint. The lower shell 22 is a waterproof structure with a hollow interior and a plurality of compartments. The base 214 is also a waterproof structure with a hollow interior and a plurality of compartments. The compartments can serve as equipment cabins or ballast cabins according to design requirements, so that the center of gravity of the device as a whole is pressed down, and the overall structural stability of the device is enhanced.

[0032] The base 214 is fixedly connected to the upper end of the lower shell 22, and the lower shell 22 is provided with power equipment and a servo control system. The power device of the servo control system controls the ring 2141 on the base 214, so that it can rotate clockwise and counterclockwise around the central axis of the device 21 under the drive of the power device. The ring 2141 is sleeved and fixed on the bottom end of the flexible connector 213, and the upper end of the flexible connector 213 is sleeved and fixed on the bottom end of the shell 211. The flexible connector 213 is made of a flexible material (such as an anti-corrosion steel wire hose) that is corrosion-resistant and waterproof, can be freely bent, stretched and compressed, but has sufficient rotational rigidity. While connecting the shell 211 and the base 214, it can ensure that the shell 211 can pitch and yaw and shake up and down under the action of waves, and can also ensure that a sealed environment is formed inside the shell 211, and ensure that the shell 211 rotates with the rotation of the ring 2141 under the traction of the flexible connector 213. The ring 2141 adjusts its rotation according to the direction of the ocean current, drives the shell 211 to rotate to a specified angle, and actively controls the direction of the shell 211 and the wave flow. Since the direction of the wave flow in nature will change, when the shell shape of the device 21 is irregular, such as a rectangular or circular structure with side wings, the device 21 needs to form an optimal angle with the direction of the wave flow to ensure that the power generation efficiency of the device 21 is maximized. Controlling the rotation angle of the shell 211 can ensure that the device 21 always forms an optimal angle with the direction of the wave flow. At the same time, when there are multiple devices 21, the rotation angle of the shell 211 and the angle of the side wings (if any) can be further fine-tuned to form a phase difference in the dynamic spectrum of the force generated by each device 21 on the platform, resulting in the effects of each force canceling each other out, thereby improving the stability of the platform.

[0033] Several layers of annular permanent magnetic poles 2112 are distributed at intervals on the inner side of the shell 211. The distribution of the permanent magnetic poles 2112 must meet the magnetic pole distribution law, which is from weak to strong vertically from top to bottom, and from the minimum value to the maximum value radially from the axis to the inner side of the shell 211. The mass of the permanent magnetic pole 2112 layer increases vertically from top to bottom in order to minimize the center of gravity of the device. According to the content of the Maxwell equations that describe the electromagnetic induction principle phenomenon, the generation of current is derived from the change of the magnetic flux passing through the conductive coil over time. The greater the change rate of the magnetic flux over time, the greater the amount of electricity generated. When the shell 211 of the device 21 moves up and down with the up and down movement of the waves and the flow of the sea current, and the flow-induced vibration and galloping, the conductive coil 216 cuts the magnetic flux lines in the up and down and radial directions. Compared with the case of no change, the magnetic pole distribution law is from weak to strong vertically from top to bottom, and from the minimum value to the maximum value radially from the axis to the inner side of the shell 211, which can make the change amplitude of the magnetic flux passing through the conductive coil over time larger, and can significantly enhance the power generation.

[0034] The lower end of the conductive rod 217 passes through the base 214 and the lower shell 22, and is fixed to the inner bottom surface of the lower shell 22. The upper end of the conductive rod 217 passes through the shell 211 and is placed at the axis of the shell 211. A plurality of conductive coils 216 are arranged at intervals on the conductive rod 217. A gap is reserved between each layer of conductive coils 216 and each permanent magnetic pole 2112 to ensure relative movement between the conductive coils 216 and the permanent magnetic pole 2112.

[0035] A plurality of springs 215 are radially distributed on the conductive coil 216, and the conductive coil 216 on the top of the conductive rod 217 is vertically distributed with the spring 215. The outer diameter end of the spring 215 is free and there is a certain gap with the inner side of the shell 211, so as to maximize the space for the conductive coil 216 to cut the magnetic flux lines. The elastic stiffness of the spring 215 increases nonlinearly with the amount of compression deformation. According to the published dynamic theory, the frequency of the structure is proportional to the stiffness and inversely proportional to the mass. The purpose of arranging multiple variable stiffness springs is to enlarge the natural frequency spectrum area of ​​the structure and make the device 21 more "sensitive". Within a wider range of wave flow spectrum, even at a very small wave flow speed, the device 21 can undergo violent mechanical movement similar to self-oscillation, and this violent mechanical movement can significantly enhance the power generation.

[0036] When the flow-induced vibration wave energy power generation device moves up and down with the up and down movement of waves and the flow of ocean currents, and vibrates and gallops due to flow, the relative position of the permanent magnet pole 2112 and the conductive coil 216 changes, and a change in magnetic flux occurs inside the conductive coil 216, thereby generating current, which is transmitted by the conductive rod 217 to the power equipment in the lower shell 22.

[0037] When the conductive rod 217 and the shell 211 move relative to each other, the spring 215 resists the movement of the shell 211, and its elastic stiffness increases rapidly with the increase of the compression deformation. This can enhance the movement flexibility of the system and avoid the frequency locking phenomenon (that is, the system is only sensitive to waves of a certain frequency. When the system is working and encounters waves of other frequency bands, the conductive rod 217 and the shell 211 cannot move relative to each other).

[0038] like Figure 7 and Figure 8 As shown, an embodiment of the present invention further provides a floating wind turbine combined power generation platform, which is a semi-submersible or tension leg structure, including one or more floating wind turbines 1, and one or more flow-induced vibration wave energy power generation devices 21 described in an embodiment of the present invention.

[0039] The floating wind turbine 1 structure and the base 214 and the lower shell 22 of each flow-induced vibration wave energy power generation device are fixedly connected to each other through the support structure 23 to form a floating platform 2, thereby improving the stability of the overall structure. In this embodiment, the support structure 23 adopts a truss. The flow-induced vibration wave energy power generation device acts as a floating structure, so that the overall buoyancy center of the structure is above the overall center of gravity, thereby enhancing the stability of the overall structure. While the floating wind turbine 1 is generating wind power, the flow-induced vibration wave energy power generation device generates electricity using the up and down fluctuations of the waves and the mechanical vibration energy perpendicular to the direction of the ocean current. After being processed by the power equipment inside the lower shell 22, it is connected to the power transmission equipment of the floating wind turbine 1 through the wires and other facilities on the support structure 23.

[0040] like Figure 7 As shown, there is only one flow-induced vibration wave energy power generation device at each corner of the floating platform 2, and the anchor cable 3 is connected to the base 214 using the known technology.

[0041] like Figure 8 As shown, for each corner of the floating platform 2, there are multiple flow-induced vibration wave energy power generation devices, and the multiple flow-induced vibration wave energy power generation devices are reinforced and connected. At the same time, the central nodes of the multiple flow-induced vibration wave energy power generation devices are fixedly connected to the floating wind turbine 1 structure through the support structure 23, and the anchor cable 3 is connected to the central node using the public technology, so as to improve the overall structural stability. Figure 8 As shown, in this embodiment, two devices 21 are arranged at each corner of the platform, and the two devices 21 are reinforced and connected with steel plates. The center of the steel plate is welded and fixed to the supporting structure 23 to form a central node, and the anchor cable 3 is connected to the central node using publicly available technology, which can ensure the rationality of the force on the platform and the overall stability.

[0042] like Figure 1 , Figure 7 and Figure 8As shown, the flow-induced vibration wave energy power generation device is a cylindrical structure with one or more side wings 212, and the side wings 212 are used to change the movement path of the ocean current and improve the overall stability of the floating platform 2. The shell 211 and the side wings 212 are connected by a node, and the node is connected to the power device of the servo control system. The node can rotate under the drive of the power device of the servo control system, driving the side wings 212 to open a specified angle. The active angle range of the side wings 212 is 0° to 90°. The size and opening angle of the side wings 212 need to be designed according to the actual engineering wave current speed and frequency characteristics to enhance the flow-induced vibration and galloping sensitivity of the flow-induced vibration wave energy power generation device. According to the principles of fluid mechanics, the addition of side wings to the shell 211 and the angle of the side wings relative to the shell 211 can significantly change the flow mechanism of the fluid at the edge of the shell 211, thereby changing the force state of the shell 211. Therefore, when the rotation angle of the shell 211 and the angle of the side wings are further fine-tuned, the dynamic spectrum of the force generated by each device 21 on the platform will form a phase difference, resulting in the effects of each force offsetting each other, which can improve the stability of the platform.

[0043] By adjusting the rotation angle of the shell 211, the combined force of flow-induced vibration and galloping vibration on each flow-induced vibration wave energy power generation device is controlled to be zero, thereby reducing the impact of each flow-induced vibration wave energy power generation device on the overall structure of the floating platform 2.

[0044] like Figure 3 As shown, the flow-induced vibration wave energy power generation device 21 is a cylindrical structure without side wings. Figure 6 As shown, the flow-induced vibration wave energy power generation device 21 is a rectangular structure without side wings. Figure 7 As shown, the flow-induced vibration wave energy power generation device 21 is a rectangular structure with side wings. Figure 8 As shown, the internal structure of the rectangular flow-induced vibration wave energy power generation device in cross-section is consistent with that of the circular one.

Claims

1. A flow-induced vibration wave energy power generation device, characterized in that: The device comprises a housing (211), a base (214), a conductive rod (217) and a lower housing (22); the base (214) and the lower housing (22) are hollow inside, the base (214) is fixed to the upper end of the lower housing (22), and the lower housing (22) is provided with power equipment and a servo control system; The housing (211) is connected to a ring (2141) on a base (214) via a flexible connector (213); the ring (2141) can rotate clockwise and counterclockwise around the central axis of the device under the drive of a power device of a servo control system; the flexible connector (213) is made of an anti-corrosion and waterproof flexible material; the housing (211) can pitch and roll, and shake up and down under the action of waves; The ring (2141) is adjusted to rotate according to the direction of the ocean current, driving the housing (211) to rotate at a specified angle, actively controlling the direction of the housing (211) and the wave current, and improving the power generation efficiency of the device; A plurality of layers of annular permanent magnetic poles (2112) are distributed at intervals on the inner side of the shell (211), and the distribution of the permanent magnetic poles (2112) satisfies the magnetic pole distribution law, and the vertical direction changes from weak to strong from top to bottom, and the radial direction changes from the minimum value to the maximum value from the axis to the inner side of the shell (211); the lower end of the conductive rod (217) passes through the base (214) and the lower shell (22), and is fixed to the inner bottom surface of the lower shell (22); the upper end of the conductive rod (217) passes through the shell (211) and is placed at the axis of the shell (211), and a plurality of conductive coils (216) are distributed at intervals on the conductive rod (217); a gap is reserved between each layer of conductive coils (216) and each permanent magnetic pole (2112), so as to ensure the relative movement between the conductive coils (216) and the permanent magnetic poles (2112); When the flow-induced vibration wave energy power generation device moves up and down with the up and down movement of waves and the flow of sea currents, and vibrates and gallops due to flow, the relative position of the permanent magnetic pole (2112) and the conductive coil (216) is driven to change, and a change in magnetic flux is generated inside the conductive coil (216), thereby generating current, and the current is transmitted by the conductive rod (217) to the power equipment of the lower shell (22).

2. The flow-induced vibration wave energy power generation device according to claim 1, characterized in that: A plurality of springs (215) are radially distributed on the conductive coil (216), and the conductive coil (216) on the top of the conductive rod (217) is vertically distributed with the spring (215). The outer diameter end of the spring (215) is free and has a certain gap with the inner side of the shell (211). The elastic stiffness of the spring (215) increases nonlinearly with the amount of compression deformation. When the conductive rod (217) and the shell (211) move relative to each other, the spring (215) resists the movement of the shell (211), and its elastic modulus increases rapidly with the increase of the amount of compression deformation, thereby avoiding the frequency locking phenomenon.

3. The flow-induced vibration wave energy power generation device according to claim 1, characterized in that: The mass of the permanent magnetic pole (2112) layer increases vertically from top to bottom to lower the center of gravity of the device.

4. The flow-induced vibration wave energy power generation device according to claim 1, characterized in that: The interior of the base (214) is a waterproof structure divided into a plurality of compartments, and the interior of the lower shell (22) is also a waterproof structure divided into a plurality of compartments. The compartments serve as equipment compartments or ballast compartments to lower the center of gravity of the device.

5. The flow-induced vibration wave energy power generation device according to claim 1, characterized in that: It is a cylindrical structure or a rectangular structure.

6. A floating wind turbine combined power generation platform, characterized in that: It is a semi-submersible or tension-leg structure, comprising one or more floating wind turbines (1), and one or more flow-induced vibration wave energy power generation devices according to any one of claims 1 to 5; the floating wind turbine (1) structure and the base (214) and lower shell (22) of each flow-induced vibration wave energy power generation device are fixedly connected to each other through a supporting structure (23) to form a floating platform (2); the flow-induced vibration wave energy power generation device acts as a floating structure, so that the overall buoyancy center of the structure is above the overall center of gravity; while the floating wind turbine (1) is generating wind power, the flow-induced vibration wave energy power generation device generates electricity using the up and down fluctuations of waves and the mechanical vibration energy perpendicular to the direction of the ocean current, and after being processed by the internal power equipment of the lower shell (22), it is connected to the power transmission equipment on the floating wind turbine (1) through the wires on the supporting structure (23).

7. The floating wind turbine combined power generation platform according to claim 6, characterized in that: Each corner of the floating platform (2) is provided with only one flow-induced vibration wave energy power generation device, and the anchor cable (3) is connected to the base (214).

8. The floating wind turbine combined power generation platform according to claim 6, characterized in that: Each corner of the floating platform (2) is provided with a plurality of the flow-induced vibration wave energy power generation devices, and the plurality of the flow-induced vibration wave energy power generation devices are reinforcedly connected to each other. At the same time, the central nodes of the plurality of the flow-induced vibration wave energy power generation devices are fixedly connected to the floating wind turbine (1) structure via a supporting structure (23), and the anchor cable (3) is connected to the central node.

9. The floating wind turbine combined power generation platform according to any one of claims 6 to 8, characterized in that: One or more side wings (212) are distributed on the shell (211) of the flow-induced vibration wave energy power generation device, and the side wings (212) are used to change the movement path of the ocean current.

10. The floating wind turbine combined power generation platform according to claim 9, characterized in that: The shell (211) and the wing (212) are connected by a node, and the node is connected to a power device of a servo control system. The node can make the wing (212) rotate under the drive of the power device of the servo control system, and drive the wing (212) to open a specified angle; by adjusting the rotation angle of the shell (211) and the angle of the wing (212), the forces generated by each device on the platform are offset, thereby improving the stability of the floating platform (2).

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