An oscillating floating wave energy device based on multiple asymmetric roll reduction

Abstract

The present invention discloses an oscillating floating wave energy device based on multiple asymmetric roll reduction, which belongs to the technical field of offshore wind power generation; it comprises a semi-submersible platform, a floating wind turbine is arranged at the center of the semi-submersible platform, a wave energy device is arranged in the semi-submersible platform, and the wave energy device comprises a shell, a vertical sliding rod is arranged inside the shell, and a counterweight block, a power generation mechanism, a limiter and a slide rail are arranged on the sliding rod in sequence from top to bottom. The present invention adopts the above structure, which can complement the use of wind energy and wave energy for power generation, and at the same time utilizes three movable oscillating floating wave energy devices to absorb the wave energy acting on the wind turbine floating platform, and adjusts the position of the oscillating floating wave energy device, installs PTO systems with different masses and stiffnesses, and adjusts different PTO damping, which effectively improves the anti-wave and roll reduction capabilities of the floating wind turbine and the survivability of the oscillating floating wave energy device.

Description

Technical Field

[0001] The invention relates to the technical field of offshore power generation devices, and in particular to an oscillating floating wave energy device based on multiple asymmetric roll reduction. Background Art

[0002] Because sea breeze is not blocked by the complex terrain and dense vegetation on land, its flow rate is often faster and the wind speed is more stable, which makes the power of offshore wind turbines generally higher than that of onshore wind power. However, there are problems such as high construction cost and technical difficulty of fixed wind turbines, and strong motion response of floating wind turbine platforms. Wave energy resources have large reserves, wide distribution, and high energy flow density. The oscillating floating device has high conversion efficiency, small size, and flexible layout, but it has problems such as weak working stability and low self-survival ability. When the wind turbine and the oscillating floating device are integrated in the same system, the two will produce complex interactions under the joint action of waves and wind, resulting in periodic and large pitch motion of the wind turbine and the floating body. This movement not only seriously affects the power generation efficiency and stability of the wind turbine and the floating body, but also greatly increases the overturning risk of the entire system, posing a severe challenge to the safety and reliability of the system. Therefore, a floating wind turbine-oscillating floating body wave energy integrated system that can resist wind and waves and reduce pitch is proposed. Summary of the invention

[0003] The purpose of the present invention is to provide an oscillating floating wave energy device based on multiple asymmetric roll reduction, which can complement the use of wind energy and wave energy for power generation, and at the same time utilize three movable oscillating floating wave energy devices to absorb wave energy acting on a wind turbine floating platform, and adjust the position of the oscillating floating wave energy device, install PTO systems of different masses and stiffnesses, and adjust different PTO damping, thereby effectively improving the anti-wave and roll reduction capabilities of the floating wind turbine and the survivability of the oscillating floating wave energy device.

[0004] To achieve the above-mentioned object, the present invention provides an oscillating floating body wave energy device based on multiple asymmetric roll reduction, comprising a semi-submersible platform, a floating wind turbine is arranged at the center of the semi-submersible platform, a sensor is arranged on the floating wind turbine, a wave energy device is arranged in the semi-submersible platform, slide rails are arranged at both ends of the wave energy device, the wave energy device comprises a shell, a vertical sliding rod is arranged inside the shell, and a limiter, a counterweight, a power generation mechanism, and a limiter are arranged on the sliding rod in order from top to bottom;

[0005] The sensor detects the wave hydrodynamic environment, wind force and wind direction information.

[0006] Preferably, the semi-submersible platform includes three buoys of the same structure, each of which is provided with a base at the bottom, the buoys include an upper buoy and a lower buoy, a wave energy device is provided between an upper buoy and a lower buoy, the buoys are connected to the floating wind turbine through a connecting frame, the three buoys form an equilateral triangle structure, and a wave energy device is provided inside each buoy.

[0007] Preferably, the counterweight block is connected to the top of the outer shell through a spring, and the power generation mechanism is arranged as a stator, an iron core and a mover from the outside to the inside, the mover is arranged on the sliding rod, the outer side of the iron core is wound with wires and is correspondingly arranged as an electromagnet, and the stator is fixed on the inner side of the outer shell.

[0008] Preferably, each of the slide rails includes an outer rail and an inner rail with an outward convex structure, and a concave sliding sleeve, the sliding sleeve is embedded in the interior of the slide rail, a motor is arranged inside the sliding sleeve, the two ends of the wave energy device are respectively connected to the corresponding sliding sleeves, and the motor serves as the power for the sliding sleeve to move in the slide rail.

[0009] Preferably, the counterweight and the housing form a multi-resonance system, and the calculation formula is as follows:

[0010] ;

[0011] In the above formula, is the total mass of the device, , , are the masses of the counterweights of the three heaving wave energy devices, For the additional mass, , , are the displacement, velocity and acceleration of the semi-submersible platform respectively. , , are the absolute accelerations of the counterweights in the three wave energy devices, and are the radiation damping and viscous damping of the semi-submersible platform, is the restoring force coefficient of the semi-submersible platform, is the force on the platform in water, is the wind force on the semi-submersible platform, is the sum of the forces between the three wave energy devices and the semi-submersible platform, , , are the forces between the three heaving wave energy devices and the platform, , , are the relative displacements of the forces between the PTO systems of the three wave energy devices and the platform, , , are the relative speeds of the forces between the PTO systems of the three wave energy devices and the platform, , , are the speeds of movement between the PTO systems of the three wave energy devices and the platform, , , They are the displacements of the motion between the PTO systems and the platforms of the three wave energy devices;

[0012] The equation for capturing wave energy is as follows:

[0013] ;

[0014] In the above formula, is the wave energy capture power, is the damping coefficient of PTO, and are the heaving speeds of the semi-submersible platform and the wave energy device, respectively.

[0015] Therefore, the present invention adopts the above-mentioned oscillating floating body wave energy device based on multiple asymmetric roll reduction, which has the following advantages:

[0016] (1) In the present invention, the permanent magnet synchronous linear motor in the heave wave energy device is a generator with variable damping, which provides reverse damping forces of different magnitudes to reduce the shaking degree of the semi-submersible platform. Specifically, a coordinated control system is formed by sensors and mobile motors. The sensors monitor the wave hydrodynamic environment, wind force and wind direction in real time and feed back to the heave wave energy device. The heave wave energy device will change the damping size by changing the magnetic field size of the electromagnet to form a reverse pitch torque, which can achieve the effect of anti-wave and anti-rolling, and improve the stability of wind turbine power generation.

[0017] (2) In the present invention, the coordinated control system monitors the wave hydrodynamic environment and wind force and direction in real time and feeds back to the motor, which drives the sliding sleeve to move, so that the wave energy devices inside the three buoys can be moved to the corresponding positions in advance and can move along the slide rail to form asymmetry, change the center of gravity of the semi-submersible platform, and thus enhance stability to resist the overturning moment formed by wind and wave loads, and cooperate with the variable PTO damping to maximize the safety of the floating wind turbine-oscillating floating body wave energy integrated system.

[0018] (3) The built-in heave wave energy device of the present invention is not fixed to the bottom of the connecting tube, and PTO systems of different masses and stiffnesses can be installed for roll reduction. Moreover, if a single wave energy device is damaged, it can be directly repaired or replaced, which can effectively reduce the maintenance cost of the device.

[0019] (4) The present invention places a heave wave energy device inside the connecting tube of the floating wind turbine platform, which can effectively reduce the motion response of the semi-submersible platform under the combined action of wind and waves, and improve the stability of wind turbine power generation. When the platform motion response is small, the wave energy device can provide control power and energy supplement for the wind turbine, thereby improving the power generation efficiency of the integrated system. At the same time, the wave energy device will also be protected by the platform connecting tube to increase its service life, which can effectively reduce operation and maintenance costs.

[0020] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a structural diagram of an oscillating floating body wave energy device based on multiple asymmetric roll reduction according to the present invention;

[0022] Figure 2 It is a structural diagram of a wave energy device in an oscillating floating body wave energy device based on multiple asymmetric roll reduction according to the present invention;

[0023] Figure 3 It is a schematic diagram of the internal structure of an oscillating floating body wave energy device based on multiple asymmetric roll reduction according to the present invention;

[0024] Figure 4 It is a schematic structural diagram of a slide rail in an oscillating floating body wave energy device based on multiple asymmetric roll reduction according to the present invention;

[0025] Figure 5 It is a schematic structural diagram of a sliding sleeve in an oscillating floating body wave energy device based on multiple asymmetric roll reduction according to the present invention;

[0026] Figure numerals: 1. floating wind turbine; 2. semi-submersible platform; 2-1. upper buoy; 2-2. lower buoy; 2-3. base; 3. wave energy device; 3-1. outer shell; 3-2. spring; 3-3. limiter 1; 3-4. counterweight; 3-5. stator; 3-6. iron core; 3-7. mover; 3-8. sliding rod; 3-9. limiter 2; 4. sliding rail; 4-1. outer rail; 4-2. inner rail; 4-3. sliding sleeve; 4-4. sensor; 4-5. motor. DETAILED DESCRIPTION

[0027] 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.

[0028] Example

[0029] like Figure 1-Figure 5 As shown, the present invention provides an oscillating floating wave energy device based on multiple asymmetric roll reduction, including a semi-submersible platform 2, a floating wind turbine 1 is arranged at the center of the semi-submersible platform 2, the floating wind turbine 1 is used for wind power generation, a sensor 4-4 is arranged on the floating wind turbine 1, the sensor 4-4 detects the wave hydrodynamic environment and wind force and wind direction, and adjusts the working state of the wave energy device 3 according to the detected data, the semi-submersible platform 2 includes three buoys of the same structure, each of which is provided with a base 2-3 at the bottom, each buoy includes an upper buoy 2-1 and a lower buoy 2-2, a wave energy device 3 is arranged between an upper buoy 2-1 and a lower buoy 2-2, and the buoys are connected to the floating wind turbine 1 through a connecting frame, and the three buoys form an equilateral triangle structure. A wave energy device 3 is arranged inside each buoy;

[0030] Slide rails 4 are arranged at both ends of the wave energy device 3, and each slide rail 4 includes an outer rail 4-1 and an inner rail 4-2 of a convex structure, and a concave sliding sleeve 4-3. The sliding sleeve 4-3 is embedded in the interior of the slide rail 4, so that the sliding sleeve 4-3 slides inside the slide rail 4. A motor 4-5 is arranged inside the sliding sleeve 4-3. Both ends of the wave energy device 3 are respectively connected to the corresponding sliding sleeves 4-3. The motor 4-5 serves as the power for the sliding sleeve 4-3 to move in the slide rail 4, thereby changing the center of gravity distribution of the semi-submersible platform 2 and enhancing stability.

[0031] The wave energy device 3 includes a vertical sliding rod 3-8 disposed inside the outer shell 3-1, and a limiter 3-3, a counterweight 3-4, a power generation mechanism, and a limiter 3-9 are disposed on the sliding rod 3-8 in order from top to bottom; the counterweight 3-4 is connected to the outer shell 3-1 through a spring 3-2, and the power generation mechanism is disposed in order from outside to inside as a stator 3-5, an iron core 3-6, and a mover 3-7, and the mover 3-7 is disposed on the sliding rod 3-8, and an electric wire is wound around the outer side of the iron core 3-6, which is correspondingly configured as an electromagnet, and the stator 3-5 is fixed to the inner side of the outer shell 3-1.

[0032] Among them, the counterweight block and the shell form a multi-resonance system, and the calculation formula is as follows:

[0033] ;

[0034] In the above formula, is the total mass of the device, , , are the masses of the counterweights of the three heaving wave energy devices, For the additional mass, , , are the displacement, velocity and acceleration of the semi-submersible platform respectively. , , are the absolute accelerations of the counterweights in the three wave energy devices, and are the radiation damping and viscous damping of the semi-submersible platform, is the restoring force coefficient of the semi-submersible platform, is the force on the platform in water, is the wind force on the semi-submersible platform, is the sum of the forces between the three wave energy devices and the semi-submersible platform, , , are the forces between the three heaving wave energy devices and the platform, , , are the relative displacements of the forces between the PTO systems of the three wave energy devices and the platform, , , are the relative speeds of the forces between the PTO systems of the three wave energy devices and the platform, , , are the speeds of movement between the PTO systems of the three wave energy devices and the platform, , , They are the displacements of the motion between the PTO systems and the platforms of the three wave energy devices;

[0035] The equation for capturing wave energy is as follows:

[0036] ;

[0037] In the above formula, is the wave energy capture power, is the damping coefficient of PTO, and are the heaving speeds of the semi-submersible platform and the wave energy device, respectively.

[0038] The specific use process is as follows: the undulation of waves drives the wave energy device to move, the counterweight block carries the mover and the iron core on the mover to move up and down repeatedly on the sliding rod, and the stator continuously cuts the magnetic flux lines to generate electricity. The sensor monitors the wave hydrodynamic environment in real time and feeds back to the wave energy device. The active controller of the PTO system can adjust the current of the wire on the iron core according to the sea conditions to change the size of the magnetic field, thereby adjusting the damping size of the PTO system to form a reverse pitch torque, achieving the effect of anti-wave and anti-rolling of the semi-submersible platform, improving the stability of wind turbine power generation, and avoiding tipping.

[0039] Therefore, the present invention adopts an oscillating floating wave energy device based on multiple asymmetric roll reduction, which can complement the use of wind energy and wave energy for power generation, and at the same time utilizes three movable oscillating floating wave energy devices to absorb wave energy acting on the wind turbine floating platform, and adjusts the position of the oscillating floating wave energy device, installs PTO systems of different masses and stiffnesses, and adjusts different PTO damping, thereby effectively improving the wave resistance and roll reduction capabilities of the floating wind turbine and the survivability of the oscillating floating wave energy device.

[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. An oscillating floating wave energy device based on multiple asymmetric roll reduction, characterized in that: It comprises a semi-submersible platform, a floating wind turbine is arranged at the center of the semi-submersible platform, a sensor is arranged on the floating wind turbine, a wave energy device is arranged in the semi-submersible platform, slide rails are arranged at both ends of the wave energy device, the wave energy device comprises a shell, a vertical sliding rod is arranged inside the shell, and a limiter, a counterweight, a power generation mechanism, and a limiter are arranged on the sliding rod in order from top to bottom; The sensor detects the wave hydrodynamic environment, wind force and wind direction information; The semi-submersible platform comprises three buoys of the same structure, each of which is provided with a base at the bottom, and the buoys comprise an upper buoy and a lower buoy, a wave energy device is provided between an upper buoy and a lower buoy, the buoys are connected to the floating wind turbine via a connecting frame, the three buoys form an equilateral triangle structure, and a wave energy device is provided inside each buoy; The counterweight block is connected to the top of the shell through a spring, and the power generation mechanism is sequentially arranged from the outside to the inside as a stator, an iron core and a mover, the mover is arranged on the sliding rod, the outer side of the iron core is wound with wires and is correspondingly arranged as an electromagnet, and the stator is fixed on the inner side of the shell; Each of the slide rails comprises an outer rail and an inner rail of a convex structure, and a concave sliding sleeve, the sliding sleeve is engaged with the interior of the slide rail, a motor is arranged inside the sliding sleeve, both ends of the wave energy device are respectively connected to the corresponding sliding sleeve, and the motor serves as the power for the sliding sleeve to move in the slide rail; The counterweight and the housing form a multi-resonance system, and the calculation formula is as follows: ； In the above formula, is the total mass of the device, , , are the masses of the counterweights of the three heaving wave energy devices, For the additional mass, , , are the displacement, velocity and acceleration of the semi-submersible platform respectively. , , are the absolute accelerations of the counterweights in the three wave energy devices, and are the radiation damping and viscous damping of the semi-submersible platform, is the restoring force coefficient of the semi-submersible platform, is the force on the platform in water, is the wind force on the semi-submersible platform, is the sum of the forces between the three wave energy devices and the semi-submersible platform, , , are the forces between the three heaving wave energy devices and the platform, , , are the relative displacements of the forces between the PTO systems of the three wave energy devices and the platform, , , are the relative speeds of the forces between the PTO systems of the three wave energy devices and the platform, , , are the speeds of movement between the PTO systems of the three wave energy devices and the platform, , , They are the displacements of the motion between the PTO systems and the platforms of the three wave energy devices; The equation for capturing wave energy is as follows: ； In the above formula, is the wave energy capture power, is the damping coefficient of PTO, and are the heaving speeds of the semi-submersible platform and the wave energy device, respectively.

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