A hybrid power generation device with built-in pendulum wave energy in a floating wind turbine platform

Abstract

The present invention discloses a hybrid power generation device with built-in pendulum wave energy in a floating wind turbine platform, belonging to the technical field of offshore wind power generation; it includes a semi-submersible platform, the semi-submersible platform includes a plurality of buoys, connecting rods and mounting rods, a base is provided at the bottom of the buoy, the buoys are divided into an upper buoy and a lower buoy, a wave energy device is provided inside the buoy, a wind turbine is provided on the top surface of the semi-submersible platform, the buoys are connected by an inclined connecting rod, and the mounting rod and the buoys are connected by an intermediate connecting rod and an inclined support rod. The present invention adopts the above structure, and the semi-submersible platform is set on the sea surface to float unstably with the sea surface. With the help of the up and down displacement caused by the unstable floating, the pendulum rod in the internal wave energy device drives the hydraulic cylinder to move up and down to generate electricity. The inertial device is provided to generate electricity, which can absorb the displacement of the floating semi-submersible platform, thereby solving the problem of low stability and safety of offshore wind turbine power generation.

Description

Technical Field

[0001] The present invention relates to the technical field of offshore wind power generation technology, and in particular to a hybrid power generation device with built-in pendulum wave energy in a floating wind turbine platform. Background Art

[0002] Compared to land-based wind turbines, offshore wind turbines benefit from the open ocean and are generally able to capture stronger and more stable wind speeds, unimpeded by ground factors such as terrain, buildings, or vegetation. However, as the depth of the sea increases, the cost and technical difficulty of constructing a fixed foundation at that depth increase dramatically. Compared to land-based wind turbines and offshore wind turbines with fixed foundations, floating wind turbines face a series of challenges brought about by platform motion. In conventional marine operating environments, continuous cyclical wind and wave loads are the main factor causing structural fatigue and damage, which not only increases the failure rate of wind turbine components but also shortens their expected service life. In extreme marine environments, such as typhoons or abnormal waves, sudden strong wind and wave loads can cause structural damage or even capsize, resulting in huge economic losses. A variety of control strategies, including active and passive methods, are needed to limit the motion of the platform. Summary of the Invention

[0003] The purpose of the present invention is to provide a hybrid power generation device with built-in pendulum wave energy in a floating wind turbine platform. A semi-submersible platform is set on the sea surface and floats unstably with the sea surface. With the help of the up and down displacement caused by the unstable floating, the swing rod in the internal wave energy device drives the hydraulic cylinder to move up and down, thereby generating electricity. By providing an inertial device, it can also absorb the displacement of the floating semi-submersible platform while generating electricity, thereby solving the problem of low stability and safety of offshore wind turbine power generation.

[0004] To achieve the above-mentioned objectives, the present invention provides a hybrid power generation device with built-in pendulum wave energy in a floating wind turbine platform, comprising a semi-submersible platform, wherein the semi-submersible platform includes a plurality of buoys, connecting rods and mounting rods, a base is provided at the bottom of the buoy, and the buoy is divided into an upper buoy and a lower buoy, a wave energy device is provided inside the buoy, and a wind turbine is provided on the top surface of the semi-submersible platform.

[0005] Preferably, the mounting rod is arranged at the center of gravity of the semi-submersible platform, the connecting rod includes an oblique connecting rod, an oblique support rod and an intermediate connecting rod, the buoys are connected by the oblique connecting rod, and the mounting rod and the buoys are connected by the intermediate connecting rod and the oblique support rod.

[0006] Preferably, the wave energy device includes a shell, a hydraulic cylinder is provided inside the shell, a movable plate of the hydraulic cylinder is connected to the top of the shell through a spring, a swing device is provided below the movable plate, and the swing device is arranged from top to bottom in sequence as an upper swing rod, a lower swing rod and a spherical counterweight.

[0007] Preferably, a limiter is provided at the connection of the swing device to limit the swing angle of the spherical counterweight.

[0008] Preferably, the hydraulic cylinder and the swing device form a multi-resonance system, and the motion equation is as follows:

[0009]

[0010] In the above formula, x p They represent the acceleration, velocity and displacement of the floating platform respectively. represents the acceleration of the internal spherical counterweight, M is the total mass of the floating platform, m is the mass of the internal wave energy device counterweight, μ 附加 is the additional mass of the floating platform, B 辐射 and B 粘性 are the radiation damping and viscous damping of the floating platform, C 恢复 represents the restoring force coefficient of the floating platform, F 波激 and F 风 Indicates the wave excitation force and wind force on the platform, F PTO Indicates the PTO force between the platform and the counterweight.

[0011] Therefore, the present invention adopts the above-mentioned floating wind turbine platform with a built-in swing wave energy hybrid power generation device, which has the following advantages:

[0012] 1. The wave energy conversion device is designed to be inside the lower buoy. This layout isolates the wave energy conversion device from the complex external marine environment, which helps to improve the stability of the device and extend its service life.

[0013] 2. The system absorbs kinetic energy that is detrimental to the stability of the wind turbine through a pendulum wave energy conversion device and converts this energy into usable electrical energy through a hydraulic cylinder.

[0014] 3. The hinged design of the internal pendulum wave energy ball can absorb incident waves from different directions, and the addition of the limiter can increase the damping to limit further swing when the swing angle is large, preventing the spherical counterweight from moving too much and hitting the inner wall of the wind turbine.

[0015] 4. The present invention can optimize the operation of wave energy equipment by analyzing the dynamic characteristics of ocean waves, and can adjust the PTO system parameters to adapt to different ocean environments to ensure the safety of the system.

[0016] 5. This invention, predicated on the stable operation and viability of floating wind turbines, utilizes wave energy devices to maintain wind turbine stability. Furthermore, wave energy generation does not require grid access. Instead, it provides in-situ power generation through PTO system parameter control and wind turbine control. This effectively addresses both floating wind turbine stability and wave energy utilization.

[0017] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a structural diagram of a hybrid power generation device with built-in pendulum wave energy in a floating wind turbine platform according to the present invention;

[0019] Figure 2 This is a structural diagram of a semi-submersible platform in a hybrid power generation device with built-in pendulum wave energy in a floating wind turbine platform according to the present invention;

[0020] Figure 3 This is a schematic diagram of the swing of a swing arm in a hybrid power generation device with built-in swing-type wave energy in a floating wind turbine platform of the present invention;

[0021] Figure 4 This is a schematic diagram of a floating wind turbine platform with a built-in swing-type wave energy hybrid power generation device in the present invention, with the swing rod being vertical;

[0022] Figure numerals: 1. Wind turbine; 2. Semi-submersible platform; 3. Wave energy device; 21. Oblique connecting rod; 22. Middle connecting rod; 23. Upper buoy; 24. Lower buoy; 25. Base; 26. Mounting rod; 27. Oblique support rod; 31. Hydraulic cylinder; 32. Upper swing rod; 33. Lower swing rod; 34. Spherical counterweight; 35. Casing. DETAILED DESCRIPTION

[0023] 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.

[0024] Example

[0025] like Figures 1-4 As shown, the present invention provides a hybrid power generation device with built-in pendulum wave energy in a floating wind turbine platform, including a semi-submersible platform 2, the semi-submersible platform 2 including a plurality of buoys, connecting rods and mounting rods 26, a base 25 is provided at the bottom of the buoy, in this embodiment, the number of buoys is three, and the three buoys form an equilateral triangle structure, the mounting rod 26 is arranged at the center of gravity of the semi-submersible platform 2, that is, the center of gravity of the equilateral triangle, the connecting rods include an oblique connecting rod 21, an oblique support rod 27 and an intermediate connecting rod 22, the buoys are connected by an oblique connecting rod, the mounting rod 26 is connected to the buoys by an intermediate connecting rod 22 and an oblique support rod 27, a base 25 is provided at the bottom of the buoy, wherein the buoys are divided into an upper buoy 23 and a lower buoy 24, a wave energy device 3 is provided inside the buoy, a wind turbine is provided on the top surface of the semi-submersible platform 2, the wind turbine 1 adopts an existing wind turbine for offshore wind power generation, and the specific installation method of the connecting rod is as follows:

[0026] The upper portion of mounting rod 26 is fixedly connected to upper buoy 23 via intermediate connecting rod 22, while the lower portion of mounting rod 26 is fixedly connected to base 25 via intermediate connecting rod 22. The lower portion of mounting rod 26 is fixedly connected to upper buoy 23 via oblique support rod 27, thereby improving the stability and support strength of mounting rod 26. Adjacent upper buoys 23 are fixedly connected via oblique connecting rod 21, while adjacent bases 25 are fixedly connected via oblique connecting rod 21, thereby improving the support stability of semi-submersible platform 2.

[0027] The wave energy device 3 includes a shell 35, and a hydraulic cylinder 31 is provided inside the shell 35. The movable plate of the hydraulic cylinder 31 is connected to the top of the shell 35 through a spring, so that the movable plate can swing up and down under the action of the spring. A swing device is provided below the movable plate. The swing device is arranged from top to bottom as an upper swing rod 32, a lower swing rod 33 and a spherical counterweight 34. A limiter is provided at the connection of the swing device. When the stroke is about to be exceeded, the damping will become very large to prevent further movement in this direction, thereby limiting the swing angle of the spherical counterweight 34 to avoid collision damage.

[0028] The spherical counterweight 34 and the housing 35 form a multi-resonance system. The mass of the housing 35 and the damping it receives in water form one resonance system; the damping provided by the spherical counterweight 34 to the hydraulic cylinder forms another resonance system.

[0029] The equation of motion for a multi-resonance system is:

[0030]

[0031] In the above formula, x p They represent the acceleration, velocity and displacement of the floating platform respectively. represents the acceleration of the internal spherical counterweight, M is the total mass of the floating platform, m is the mass of the internal wave energy device counterweight, μ 附加 is the additional mass of the floating platform, B 辐射 and B 粘性 are the radiation damping and viscous damping of the floating platform, C 恢复 represents the restoring force coefficient of the floating platform, F 波激 and F 风 Indicates the wave excitation force and wind force on the platform, F PTO Indicates the PTO force between the platform and the counterweight. The specific usage process is as follows:

[0032] Wave height is detected by installing existing wave sensors on a semi-submersible platform. The wave sensors are electrically connected to the active controller in the wave energy device. The active controller is then electrically connected to the limiter and battery using existing technology as needed. The battery stores the electrical energy converted by the wave energy device and provides power for both the device and the wind turbine.

[0033] During the movement, the spherical counterweight is subjected to the force of the hydraulic cylinder, the force of the upper swing arm, and the force of the lower swing arm, which can absorb the energy of the platform swing and convert it into the movement of the spherical counterweight, which can reduce the shaking amplitude of the semi-submersible platform, thereby protecting the wind turbine and improving the stability of the wind turbine.

[0034] The specific usage process is as follows: When the device is operating normally, the waves on the sea drive the wave energy device to move through the semi-submersible platform. When the wave energy moves, the spherical counterweight block keeps swinging due to inertia, driving the hydraulic cylinder to move up and down, generating electrical energy, and the generated electrical energy is stored in the battery.

[0035] Therefore, the present invention adopts the above-mentioned hybrid power generation system with built-in pendulum wave energy, and uses a semi-submersible platform set on the sea surface to float unstably following the sea surface. With the help of the up and down displacement caused by the unstable floating, the pendulum rod in the internal wave energy device drives the hydraulic cylinder to move up and down to generate electricity. By setting up an inertial device to generate electricity, the displacement of the floating semi-submersible platform can be absorbed, thereby solving the problem of low stability and safety of offshore wind turbine power generation.

[0036] 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 floating wind turbine platform with a built-in pendulum wave energy hybrid power generation device, characterized by: The semi-submersible platform comprises a plurality of buoys, connecting rods and mounting rods. A base is provided at the bottom of the buoy, and the buoy is divided into an upper buoy and a lower buoy. A wave energy device is provided inside the buoy, and a wind turbine is provided on the top surface of the semi-submersible platform. The wave energy device includes a housing, a hydraulic cylinder is disposed inside the housing, a movable plate of the hydraulic cylinder is connected to the top of the housing via a spring, a swing device is disposed below the movable plate, and the swing device is sequentially arranged from top to bottom to include an upper swing rod, a lower swing rod, and a spherical counterweight; A limiter is provided at the connection of the swing device to limit the swing angle of the spherical counterweight; The hydraulic cylinder and the swing device form a multi-resonance system, and the motion equation is as follows: ； In the above formula, 、 、 They represent the acceleration, velocity and displacement of the floating platform respectively. represents the acceleration of the internal spherical counterweight, M is the total mass of the floating platform, m is the mass of the internal wave energy device counterweight, is the additional mass of the floating platform, and denote the radiation damping and viscous damping of the floating platform, represents the restoring coefficient of the floating platform, and Indicates the wave excitation force and wind force on the platform, Indicates the PTO force between the platform and the counterweight.

2. The floating wind turbine platform according to claim 1, wherein the device comprises a built-in swing wave energy hybrid power generation device, characterized in that: The mounting rod is arranged at the center of gravity of the semi-submersible platform, the connecting rod includes an oblique connecting rod, an oblique supporting rod and an intermediate connecting rod, the buoys are connected by the oblique connecting rod, and the mounting rod and the buoys are connected by the intermediate connecting rod and the oblique supporting rod.

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