A wave energy integrated device based on multi-resonance motion control

Abstract

The present invention discloses a wave energy integration device based on multiple resonance motion control, belonging to the technical field of offshore power generation. The device comprises a semi-submersible platform, the semi-submersible platform including several buoys and a central column. Each buoy is divided into an upper buoy and a lower buoy. A base is provided at the bottom of each buoy. A floating wind turbine is provided on the central column. The buoys and the central column are connected by a truss. A water tank is provided in the lower buoy. A water pump is provided at the bottom of the water tank. A guide rail is provided vertically inside the water tank. A heave wave energy device is provided on the guide rail via a transmission device. The present invention adopts the above structure to achieve complementary power generation of wind and wave energy. The device also achieves triple resonance of the liquid in the water tank, the built-in heave wave energy device, and the counterweight. The multiple resonance motion control can improve the efficiency of wave energy generation while reducing the heave motion of the platform, thereby improving the stability of wind turbine power generation and the safety of the integrated system.

Description

Technical Field

[0001] The present invention relates to the technical field of offshore power generation, and in particular to a wave energy integration device based on multi-resonance motion control. Background Art

[0002] Compared to onshore wind power, offshore wind power not only reduces dependence on land resources, but also boasts generally higher wind speeds and less frequent wind direction fluctuations, improving turbine power generation stability. However, for floating wind turbine platforms, resonance is more likely to occur when the platform's natural vibration period closely matches the wave period. This can lead to structural fatigue and damage, posing a serious threat to the turbine's safety and reliability. This increases maintenance costs and reduces turbine power generation stability. Summary of the Invention

[0003] The present invention aims to provide a wave energy integration device based on multi-resonance motion control, capable of achieving complementary power generation from wind and wave energy. Utilizing multi-resonance motion control technology, a water pump regulates the water level in the buoy's water tank, changing the buoy's natural frequency to effectively prevent resonance between the platform and waves. This technology also achieves triple resonance between the liquid in the water tank, the built-in heave wave energy device, and the counterweight. Multi-resonance motion control improves wave energy generation efficiency while simultaneously reducing the platform's heave motion, thereby enhancing the stability of wind turbine power generation and the safety of the integrated system.

[0004] To achieve the above-mentioned objectives, the present invention provides a wave energy integration device based on multiple resonance motion control, including a semi-submersible platform, wherein the semi-submersible platform includes several buoys and a central column, each buoy is divided into an upper buoy and a lower buoy, and a base is provided at the bottom of each buoy. A floating wind turbine is provided on the central column, and the buoy and the central column are connected by a truss. A water tank is provided in the lower buoy, and a water pump is provided at the bottom of the water tank. A guide rail is vertically provided inside the water tank, and the guide rail is provided with a vertical wave energy device through a transmission device.

[0005] Preferably, ballast water is provided in the hollow interior of the base, and the water pump connects the water tank with the base.

[0006] Preferably, the transmission device includes a connecting rod arranged in the guide rail, a generator is provided at the other end of the connecting rod, a gear of the generator is connected to a vertically arranged rack, and a wave energy device is provided at the bottom of the rack.

[0007] Preferably, the wave energy device includes a cylindrical shell, a pulley is provided on the side of the shell, the pulley slides in the guide rail, a sliding rod is vertically provided at the central position inside the shell, limiters are provided at both ends of the sliding rod, and the sliding rod is sequentially provided with a counterweight block and a power generation device from top to bottom, and the top of the counterweight block is connected to the inside of the shell through a spring.

[0008] Preferably, the power generation device includes a mover, a stator and a magnet, the mover and the magnet are arranged on the sliding rod, and the stator is fixed to the inner wall of the shell.

[0009] Preferably, the semi-submersible platform, the heaving wave energy device and the counterweight block form a multi-resonance system, and the motion equation of the multi-resonance system is:

[0010]

[0011] In the above formula, M 平台 is the mass of the wind turbine platform, M is the mass of a single built-in heaving wave energy device, m is the mass of the counterweight, A1 is the additional mass of the wind turbine platform, A2 is the additional mass of the built-in heaving wave energy device, x 平台 is the acceleration, velocity and motion displacement of the fan platform, are the absolute accelerations of the three built-in heaving wave energy devices, is the speed between the three built-in heaving wave energy devices and the wind turbine platform, x 1,1 、x 1,2 、x 1,3 is the displacement between the three built-in heaving wave energy devices and the wind turbine platform, B 辐射平台 and B 粘性平台 are the radiation damping and viscous damping of the wind turbine platform, B 辐射1 and B 粘性1 are the radiation damping and viscous damping of the built-in heave wave energy device, C 恢复平台 is the restoring coefficient of the wind turbine platform, C 恢复1 is the restoring force coefficient of the built-in heaving wave energy device, F 水 is the force on the wind turbine platform in water, F 风 is the wind load on the wind turbine platform, F 水舱 is the interaction force between the built-in heaving wave energy device and the liquid in the water tank, F PTO总1 is the sum of the forces between the three built-in heaving wave energy device generators and the platform, F PTO1,1 、F PTO1,2 、F PTO1,3 They are the forces between the three built-in heaving wave energy device generators and the platform, F PTO2,1 、FPTO2,2 、F PTO2,3 They are the forces between the PTO system and the shell of the three built-in heaving wave energy devices, B 1,1 、B 1,2 、B 1,3 is the relative displacement between the three built-in heaving wave energy device generators and the platform, K 1,1 , K 1,2 , K 1,3 is the relative speed between the three built-in heaving wave energy device generators and the platform, B 2,1 、B 2,2 、B 2,3 is the relative displacement between the PTO system and the shell of the built-in heave wave energy device, K 2,1 , K 2,2 , K 2,3 is the relative speed of the force between the PTO system and the shell of the built-in heaving wave energy device, are the absolute accelerations of the three counterweights, is the speed of movement between the PTO system and the housing of the three built-in heaving wave energy devices, x 2,1 、x 2,2 、x 2,3 is the displacement between the PTO system and the housing of the three built-in heave wave energy devices;

[0012] The heave wave energy device captures wave energy through the instantaneous wave power generated by the heave motion of the beam and the shell of the wave energy device. Its energy capture equation is:

[0013]

[0014] In the above formula, B i,j Including B 1,1 、B 1,2 、B 1,3 、B 2,1 、B 2,2 、B 2,3 , include

[0015] Therefore, the present invention adopts the above-mentioned wave energy integration device based on multiple resonance motion control, which has the following advantages:

[0016] (1) In the present invention, a permanent magnet synchronous linear generator with variable damping is equipped. Through a coordinated control system, the hydrodynamic characteristics of waves and changes in wind speed and direction can be monitored in real time, and this information is fed back to the device itself. Based on this data, the built-in heaving wave energy device can adjust the magnetic field size of the electromagnet and thus change the damping force, generating a torque opposite to the shaking direction, effectively reducing the pitch of the equipment, thereby enhancing the power generation efficiency and stability of the wind turbine.

[0017] (2) In the present invention, a water tank is provided within the buoy of the semi-submersible platform. The water level in the water tank is adjusted by a water pump, thereby changing the natural frequency of the buoy, effectively preventing resonance between the platform and external waves. This improves the safety and reliability of wind turbine power generation and reduces maintenance costs.

[0018] (3) In the present invention, a guide rail, a transmission device, a generator, and a built-in heave wave energy device are installed in the water tank. By utilizing multi-resonance motion control technology, the water level in the water tank within the buoy is adjusted by a water pump, thereby simultaneously achieving triple resonance of the liquid in the water tank, the built-in heave wave energy device, and the counterweight. Multi-resonance motion control can improve the efficiency of wave energy generation while reducing the heave motion of the platform, thereby improving the stability of wind turbine power generation and the safety of the integrated system.

[0019] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 Schematic diagram of a wave energy integration device based on multi-resonance motion control according to the present invention;

[0021] Figure 2 This is a schematic diagram of the interior of a buoy in a wave energy integration device based on multiple resonance motion control according to the present invention;

[0022] Figure 3 Schematic diagram of a wave energy device in a wave energy integration device based on multiple resonance motion control according to the present invention;

[0023] Figure 4 This is a schematic diagram of a transmission device in a wave energy integration device based on multi-resonance motion control according to the present invention;

[0024] Figure numerals: 1. floating wind turbine; 2. semi-submersible platform; 21. lower buoy; 22. base; 23. upper buoy; 24. water tank; 25. water pump; 3. heaving wave energy device; 31. pulley; 32. counterweight; 33. magnet; 34. mover; 35. sliding rod; 36. housing; 37. spring; 38. stator; 39. limiter; 4. transmission device; 41. guide rail; 42. connecting rod; 43. generator; 44. gear; 45. rack. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. The components of the embodiments of the present invention generally described and shown in the drawings here can be arranged and designed in various different configurations. The specific model specifications need to be selected and determined based on the actual specifications of the device, and the specific selection calculation structure adopts the existing technology in this field, so it will not be described in detail.

[0026] Example

[0027] like Figure 1-Figure 4 As shown, the present invention provides a wave energy integration device based on multiple resonance motion control, including a semi-submersible platform 2, which includes several buoys and a central column. Each buoy is divided into an upper buoy 23 and a lower buoy 21. A base 22 is provided at the bottom of each buoy, and a floating wind turbine 1 is provided on the central column. The buoy and the central column are connected by a truss. A water tank 24 is provided in the buoy, and a water pump 25 is provided at the bottom of the water tank 24. Ballast water is provided in the hollow interior of the base 22. The water pump 25 connects the water tank with the base 22. A guide rail 41 is vertically provided inside the water tank, and the guide rail 41 is provided with a heave wave energy device 3 through a transmission device 4.

[0028] The transmission device 4 includes a connecting rod 42 arranged in a guide rail 41. The other end of the connecting rod 42 is provided with a generator 43. The gear 44 of the generator 43 is connected to a vertically arranged rack 45. The bottom of the rack 45 is provided with a wave energy device. The wave energy device includes a cylindrical housing 36. The side of the housing 36 is provided with a pulley 31. The pulley 31 slides in the guide rail 41. The inner center of the housing 36 is vertically provided with a sliding rod 35. The sliding rod 35 is provided with a limiter 39 at each end. The sliding rod 35 is provided with a counterweight block 32 and a generator device from top to bottom. The generator device includes a mover 34, a stator 38 and a magnet 33. The mover 34 and magnet 33 are arranged on the sliding rod 35. The stator 38 is fixed to the inner wall of the housing 36. The top of the counterweight block 32 is connected to the inside of the housing 36 by a spring 37.

[0029] The semi-submersible platform, heave wave energy device and counterweight block form a multi-resonance system. The motion equation of the multi-resonance system is:

[0030]

[0031] In the above formula, M 平台is the mass of the wind turbine platform, M is the mass of a single built-in heaving wave energy device, m is the mass of the counterweight, A1 is the additional mass of the wind turbine platform, A2 is the additional mass of the built-in heaving wave energy device, x 平台 is the acceleration, velocity and motion displacement of the fan platform, are the absolute accelerations of the three built-in heaving wave energy devices, is the speed between the three built-in heaving wave energy devices and the wind turbine platform, x 1,1 、x 1,2 、x 1,3 is the displacement between the three built-in heaving wave energy devices and the wind turbine platform, B 辐射平台 and B 粘性平台 are the radiation damping and viscous damping of the wind turbine platform, B 辐射1 and B 粘性1 are the radiation damping and viscous damping of the built-in heave wave energy device, C 恢复平台 is the restoring coefficient of the wind turbine platform, C 恢复1 is the restoring force coefficient of the built-in heaving wave energy device, F 水 is the force on the wind turbine platform in water, F 风 is the wind load on the wind turbine platform, F 水舱 is the interaction force between the built-in heaving wave energy device and the liquid in the water tank, F PTO总1 is the sum of the forces between the three built-in heaving wave energy device generators and the platform, F PTO1,1 、F PTO1,2 、F PTO1,3 They are the forces between the three built-in heaving wave energy device generators and the platform, F PTO2,1 、F PTO2,2 、F PTO2,3 They are the forces between the PTO system and the shell of the three built-in heaving wave energy devices, B 1,1 、B 1,2 、B 1,3 is the relative displacement between the three built-in heaving wave energy device generators and the platform, K 1,1 , K 1,2 , K 1,3 is the relative speed between the three built-in heaving wave energy device generators and the platform, B 2,1 、B 2,2 、B 2,3 is the relative displacement between the PTO system and the shell of the built-in heave wave energy device, K 2,1 , K 2,2 , K 2,3 is the relative speed of the force between the PTO system and the shell of the built-in heaving wave energy device, are the absolute accelerations of the three counterweights, is the speed of movement between the PTO system and the housing of the three built-in heaving wave energy devices, x 2,1 、x 2,2 、x 2,3 is the displacement between the PTO system and the housing of the three built-in heave wave energy devices;

[0032] The heave wave energy device captures wave energy through the instantaneous wave power generated by the heave motion of the beam and the shell of the wave energy device. Its energy capture equation is:

[0033]

[0034] In the above formula, B i,j Including B 1,1 、B 1,2 、B 1,3 、B 2,1 、B 2,2 、B 2,3 , include

[0035] The specific usage process is as follows: the ups and downs of the waves drive the semi-submersible platform to move, and at the same time, the water surface in the water tank 24 in the lower buoy also fluctuates up and down. The water pump adjusts the water level in the water tank so that the natural frequency of the semi-submersible platform 2 is different from the frequency of the external waves, thereby avoiding resonance between the semi-submersible platform and the external waves. At the same time, the frequency of the liquid in the water tank is made the same as the natural frequency of the built-in heaving wave energy device and the counterweight block, thereby achieving triple resonance of the liquid in the water tank, the built-in heaving wave energy device and the counterweight block.

[0036] The built-in heave wave energy device is affected by the ups and downs of the water surface in the water tank, and it moves heave along the guide rails through pulleys fixed above and below the shell. A rack fixed to the top of the shell drives the gear to rotate, which in turn drives the generator to generate electricity.

[0037] The counterweight carries the mover and the magnet on the mover to perform vertical swing motion on the sliding rod, and the stator continuously cuts the magnetic flux lines to generate electrical energy.

[0038] At the same time, through the coordinated control system, the hydrodynamic characteristics of the waves are monitored in real time and fed back to the built-in heave wave energy device. The active controller of the PTO system can adjust the current in the wires on the magnet according to the real-time sea conditions, thereby changing the size of the magnetic field, thereby adjusting the damping size of the PTO system, generating a torque in the opposite direction of the shaking, effectively reducing the pitch roll caused by waves, and improving the stability of wind turbine power generation.

[0039] Therefore, the present invention utilizes a wave energy integration device based on multi-resonance motion control, enabling complementary wind and wave energy generation. This multi-resonance motion control technology uses a pump to adjust the water level in the buoy's water tank, changing the buoy's natural frequency to effectively prevent resonance between the platform and the waves. This technology also achieves triple resonance between the liquid in the water tank, the built-in heave wave energy device, and the counterweight. Multi-resonance motion control improves wave energy generation efficiency while reducing the platform's heave motion, thereby enhancing the stability of wind turbine power generation and the safety of the integrated system.

[0040] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit the same. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that they can still modify or replace the technical solutions of the present invention with equivalents, and these modifications or equivalent replacements cannot cause the modified technical solutions to deviate from the spirit and scope of the technical solutions of the present invention.

Claims

1. A wave energy integration device based on multi-resonance motion control, characterized by: The semi-submersible platform comprises a plurality of buoys and a central column. Each buoy is divided into an upper buoy and a lower buoy. A base is provided at the bottom of each buoy. A floating wind turbine is provided on the central column. The buoy and the central column are connected by a truss. A water tank is provided in the lower buoy. A water pump is provided at the bottom of the water tank. A guide rail is vertically provided inside the water tank. The guide rail is provided with a heave wave energy device via a transmission device. Ballast water is arranged in the hollow interior of the base, and the water pump connects the water tank with the base; The transmission device includes a connecting rod arranged in the guide rail, a generator is provided at the other end of the connecting rod, the gear of the generator is connected to a vertically arranged rack, a wave energy device is provided at the bottom of the rack, a counterweight is provided in the wave energy device, and the water level of the water tank in the buoy is adjusted by a water pump, thereby achieving triple resonance of the liquid in the water tank, the heaving wave energy device and the counterweight.

2. The wave energy integration device based on multi-resonance motion control according to claim 1, characterized in that: The wave energy device includes a cylindrical shell, a pulley is provided on the side of the shell, and the pulley slides in the guide rail. A sliding rod is vertically provided at the central position inside the shell, and limiters are provided at both ends of the sliding rod. The sliding rod is sequentially provided with a counterweight block and a power generation device from top to bottom, and the top of the counterweight block is connected to the inside of the shell through a spring.

3. The wave energy integration device based on multi-resonance motion control according to claim 2, characterized in that: The power generation device includes a mover, a stator and a magnet. The mover and the magnet are arranged on the sliding rod, and the stator is fixed to the inner wall of the shell.

4. The wave energy integration device based on multi-resonance motion control according to claim 3, characterized in that: The semi-submersible platform, heave wave energy device and counterweight block form a multi-resonance system. The motion equation of the multi-resonance system is: In the above formula, M 平台 is the mass of the wind turbine platform, M is the mass of a single built-in heaving wave energy device, m is the mass of the counterweight, A1 is the additional mass of the wind turbine platform, A2 is the additional mass of the built-in heaving wave energy device, x 平台 is the acceleration, velocity and motion displacement of the fan platform, are the absolute accelerations of the three built-in heaving wave energy devices, is the speed between the three built-in heaving wave energy devices and the wind turbine platform, x 1,1 、x 1,2 、x 1,3 is the displacement between the three built-in heaving wave energy devices and the wind turbine platform, B 辐射平台 and B 粘性平台 are the radiation damping and viscous damping of the wind turbine platform, B 辐射1 and B 粘性1 are the radiation damping and viscous damping of the built-in heave wave energy device, C 恢复平台 is the restoring coefficient of the wind turbine platform, C 恢复1 is the restoring force coefficient of the built-in heaving wave energy device, F 水 is the force on the wind turbine platform in water, F 风 is the wind load on the wind turbine platform, F 水舱 is the interaction force between the built-in heaving wave energy device and the liquid in the water tank, F PTO总1 is the sum of the forces between the three built-in heaving wave energy device generators and the platform, F PTO1,1 、F PTO1,2 、F PTO1,3 They are the forces between the three built-in heaving wave energy device generators and the platform, F PTO2,1 、F PTO2,2 、F PTO2,3 They are the forces between the PTO system and the shell of the three built-in heaving wave energy devices, B 1,1 、B 1,2 、B 1,3 is the relative displacement between the three built-in heaving wave energy device generators and the platform, K 1,1 , K 1,2 , K 1,3 is the relative speed between the three built-in heaving wave energy device generators and the platform, B 2,1 、B 2,2 、B 2,3 is the relative displacement between the PTO system and the shell of the built-in heave wave energy device, K 2,1 , K 2,2 , K 2,3 is the relative speed of the force between the PTO system and the shell of the built-in heaving wave energy device, are the absolute accelerations of the three counterweights, is the speed of movement between the PTO system and the housing of the three built-in heaving wave energy devices, x 2,1 、x 2,2 、x 2,3 is the displacement between the PTO system and the housing of the three built-in heave wave energy devices; The heave wave energy device captures wave energy through the instantaneous wave power generated by the heave motion of the beam and the shell of the wave energy device. Its energy capture equation is: In the above formula, B i,j Including B 1,1 、B 1,2 、B 1,3 、B 2,1 、B 2,2 、B 2,3 , include

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