Wave energy integration device based on multi-resonance motion control

Abstract

The invention discloses a wave energy integration device based on multi-resonance motion control, and belongs to the technical field of offshore power generation, the wave energy integration device comprises a semi-submersible platform, the semi-submersible platform comprises a plurality of buoys and a central stand column, each buoy is divided into an upper buoy and a lower buoy, the bottom of each buoy is provided with a base, and the central stand column is arranged on the base. A floating fan is arranged on the central stand column, the buoys and the central stand column are connected through a truss, a water tank is arranged in the lower buoy, a water pump is arranged at the bottom of the water tank, a guide rail is vertically arranged in the water tank, and a heaving wave energy device is arranged on the guide rail through a transmission device. By the adoption of the structure, complementary power generation of wind energy and wave energy can be achieved. Triple resonance of the liquid in the water tank, the built-in heaving wave energy device and the balancing weight is achieved, the wave energy power generation efficiency can be improved through multi-resonance motion control, meanwhile, heaving motion of the platform is reduced, and therefore the power generation stability of a draught fan and the safety of an integrated system are improved.

Description

Technical Field

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

[0002] Compared with onshore wind power, offshore wind power not only reduces dependence on land resources, but also has generally higher wind speeds at sea than on land, and the wind direction changes less frequently, which improves the stability of wind turbine power generation. For floating wind turbine platforms, when the natural vibration period of the platform is close to the wave period, resonance is prone to occur. This may cause fatigue and damage to the structure, posing a serious threat to the safety and reliability of the wind turbine, increasing maintenance costs and reducing the stability of wind turbine power generation. Summary of the invention

[0003] The purpose of the present invention is to provide a wave energy integration device based on multiple resonance motion control, which can realize complementary power generation of wind energy and wave energy. By using multiple resonance motion control technology, the water level of the water tank in the buoy is adjusted by a water pump, and the natural frequency of the buoy is changed to effectively avoid resonance between the platform and the waves, and triple resonance of the liquid in the water tank, the built-in heaving wave energy device and the counterweight can be achieved. Multiple resonance motion control can improve the efficiency of wave energy generation, while reducing the heaving motion of the platform, thereby improving the stability of wind turbine power generation and the safety of the integrated system.

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

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

[0006] Preferably, the transmission device comprises a connecting rod arranged in the guide rail, a generator is arranged 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 arranged 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, limit switches are provided at both ends of the sliding rod, and the sliding rod is provided with a counterweight block and a power generation device in sequence 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 comprises 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 outer shell.

[0009] Preferably, the semi-submersible platform, the heave 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 heave wave energy devices, is the speed between the three built-in heave 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 heave 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 fan 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 heave 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 heave 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 heave wave energy device generators and the platform, F PTO1,1 、F PTO1,2 、F PTO1,3 are the forces between the three built-in heave wave energy device generators and the platform, F PTO2,1 、FPTO2,2 、F PTO2,3 are the forces between the PTO system and the shell of the three built-in heave wave energy devices, B 1,1 , B 1,2 , B 1,3 is the relative displacement between the three built-in heave wave energy device generators and the platform, K 1,1 , K 1,2 , K 1,3 is the relative speed of the force 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 of the force between the PTO system and the shell in 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 heave wave energy device, are the absolute accelerations of the three counterweights, is the speed of movement between the PTO system and the housing in the three built-in heave wave energy devices, x 2,1 、x 2,2 、x 2,3 is the displacement between the PTO system and the housing in 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. The 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, which can monitor the hydrodynamic characteristics of waves and changes in wind speed and direction in real time through a coordinated control system, and feed this information back to the device itself. Based on these data, the built-in heave 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 in the buoy of the semi-submersible platform. The water level of the water tank in the buoy is adjusted by a water pump to change the natural frequency of the buoy, which can effectively avoid resonance between the platform and external waves. The safety and reliability of wind turbine power generation are improved and the maintenance cost is reduced.

[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 using the multi-resonance motion control technology, the water level of the water tank in the buoy is adjusted by a water pump, and the triple resonance of the liquid in the water tank, the built-in heave wave energy device and the counterweight can be achieved simultaneously. Multi-resonance motion control can improve the efficiency of wave energy generation and reduce 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 A schematic diagram of a wave energy integration device based on multi-resonance motion control according to the present invention;

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

[0022] Figure 3 It is a schematic diagram of a wave energy device in a wave energy integration device based on multi-resonance motion control according to the present invention;

[0023] Figure 4 It 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 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 according to the actual specifications of the device, and the specific selection calculation structure adopts the existing technology in the 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, the semi-submersible platform 2 includes a plurality of buoys and a central column, each buoy is divided into an upper buoy 23 and a lower buoy 21, a base 22 is arranged at the bottom of each buoy, a floating wind turbine 1 is arranged on the central column, the buoy and the central column are connected by a truss, a water tank 24 is arranged in the buoy, a water pump 25 is arranged at the bottom of the water tank 24, ballast water is arranged in the hollow inside of the base 22, the water pump 25 connects the water tank with the base 22, a guide rail 41 is vertically arranged inside the water tank, and a vertical wave energy device 3 is arranged on the guide rail 41 through a transmission device 4.

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

[0029] The semi-submersible platform, the heave wave energy device and the counterweight block constitute 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 heave wave energy devices, is the speed between the three built-in heave 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 heave 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 fan 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 heave 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 heave 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 heave wave energy device generators and the platform, F PTO1,1 、F PTO1,2 、F PTO1,3 are the forces between the three built-in heave wave energy device generators and the platform, F PTO2,1 、F PTO2,2 、F PTO2,3 are the forces between the PTO system and the shell of the three built-in heave wave energy devices, B 1,1 , B 1,2 , B 1,3 is the relative displacement between the three built-in heave wave energy device generators and the platform, K 1,1 , K 1,2 , K 1,3 is the relative speed of the force 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 of the force between the PTO system and the shell in 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 heave wave energy device, are the absolute accelerations of the three counterweights, is the speed of movement between the PTO system and the housing in the three built-in heave wave energy devices, x 2,1 、x 2,2 、x 2,3 is the displacement between the PTO system and the housing in 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. The 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 up and down fluctuations of the water surface in the water tank, and moves along the guide rail through the pulleys fixed on the upper and lower parts of the shell. The rack fixed on the top of the shell drives the gear to rotate, and the rotation of the gear drives the generator to generate electricity.

[0037] The counterweight block carries the mover and the magnet on the mover to swing 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 caused by waves and improving the stability of wind turbine power generation.

[0039] Therefore, the present invention adopts a wave energy integration device based on multiple resonance motion control, which can realize complementary power generation of wind energy and wave energy. Using multiple resonance motion control technology, the water level of the water tank in the buoy is adjusted by a water pump, and the natural frequency of the buoy is changed to effectively avoid resonance between the platform and the waves, and triple resonance of the liquid in the water tank, the built-in heaving wave energy device and the counterweight can be achieved. Multiple resonance motion control can improve the efficiency of wave energy generation and reduce the heaving motion of the platform, thereby improving 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 solution of the present invention rather than to limit it. 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 solution of the present invention with equivalents, and these modifications or equivalent replacements cannot cause the modified technical solution to deviate from the spirit and scope of the technical solution of the present invention.

Claims

1. A wave energy integration device based on multi-resonance motion control, characterized in that: The invention comprises a semi-submersible platform, which comprises a plurality of pontoons and a central column. Each pontoon is divided into an upper pontoon and a lower pontoon. A base is arranged at the bottom of each pontoon. A floating fan is arranged on the central column. The pontoons and the central column are connected by a truss. A water tank is arranged in the lower pontoon. A water pump is arranged at the bottom of the water tank. A guide rail is arranged vertically inside the water tank. A vertical wave energy device is arranged on the guide rail through a transmission device.

2. A wave energy integration device based on multi-resonance motion control according to claim 1, characterized in that: Ballast water is arranged in the hollow interior of the base, and the water pump connects the water tank with the base.

3. A wave energy integration device based on multi-resonance motion control according to claim 2, characterized in that: The transmission device comprises a connecting rod arranged in the guide rail, a generator is arranged 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 arranged at the bottom of the rack.

4. A wave energy integration device based on multi-resonance motion control according to claim 3, characterized in that: The wave energy device includes a cylindrical shell, a pulley is arranged on the side of the shell, the pulley slides in the guide rail, a sliding rod is vertically arranged at the central position inside the shell, limiters are arranged at both ends of the sliding rod, and a counterweight block and a power generation device are arranged on the sliding rod in sequence from top to bottom, and the top of the counterweight block is connected to the inside of the shell through a spring.

5. A wave energy integration device based on multi-resonance motion control according to claim 4, characterized in that: The power generation device comprises 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.

6. A wave energy integration device based on multi-resonance motion control according to claim 5, characterized in that: The semi-submersible platform, the heave wave energy device and the counterweight block constitute 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 heave wave energy devices, is the speed between the three built-in heave 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 heave 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 fan 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 heave 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 heave 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 heave wave energy device generators and the platform, F PTO1,1 、F PTO1,2 、F PTO1,3 are the forces between the three built-in heave wave energy device generators and the platform, F PTO2,1 、F PTO2,2 、F PTO2,3 are the forces between the PTO system and the shell of the three built-in heave wave energy devices, B 1,1 , B 1,2 , B 1,3 is the relative displacement between the three built-in heave wave energy device generators and the platform, K 1,1 , K 1,2 , K 1,3 is the relative speed of the force 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 of the force between the PTO system and the shell in 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 heave wave energy device, are the absolute accelerations of the three counterweights, is the speed of movement between the PTO system and the housing in the three built-in heave wave energy devices, x 2,1 、x 2,2 、x 2,3 is the displacement between the PTO system and the housing in 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. The 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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