Box type breakwater-semi-submersible photovoltaic platform-pendulum type wave energy integration device

Abstract

The invention discloses a box type breakwater-semi-submersible photovoltaic platform-swing type wave energy integration device, and belongs to the technical field of offshore power generation devices. Comprising a plurality of box type breakwaters, the rear ends of the box type breakwaters are connected with a plurality of semi-submersible type floating photovoltaic platforms, mooring structures are arranged in the semi-submersible type floating photovoltaic platforms at the two ends, the semi-submersible type floating photovoltaic platforms in the vertical direction are connected through swing type wave energy devices, and the swing type wave energy devices are connected with the semi-submersible type floating photovoltaic platforms in the vertical direction. The semi-submersible floating photovoltaic platforms in the horizontal direction are connected through flexible connecting structures. By the adoption of the device, wave energy and solar energy cooperative power generation and multi-energy complementation are achieved, the limitation of a single photovoltaic platform on the power generation time is broken through, meanwhile, the swing type wave energy device with the PTO can further restrain the motion response of the floating body and improve the stability of the device at the time of capturing wave energy, and then the management efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of offshore power generation devices, and in particular to a box-type breakwater-semi-submersible photovoltaic platform-pendulum wave energy integrated device. Background Art

[0002] As an important renewable energy source, ocean energy has great development potential. As one of the most mature clean energy technologies, solar photovoltaic power generation also has significant advantages in the marine environment due to its clean, efficient and sustainable characteristics. However, in the complex marine environment, the operation and maintenance of the photovoltaic and wave energy combined power generation system face many challenges. The strong movement of waves, strong winds and the corrosiveness of seawater in the marine environment pose a threat to the stability of the system and the durability of the equipment. Frequent impacts of waves may cause structural fatigue or damage to the wave energy conversion device, increasing the maintenance cost of the system. The photovoltaic system is installed on a floating body. Due to the movement of the floating body caused by the wave action, the light receiving angle of the photovoltaic panel is difficult to maintain stable, which in turn affects the power generation efficiency. How to maintain the efficient operation and maintenance and long-term stability of the photovoltaic and wave energy system in the harsh marine environment has become a difficult problem that needs to be solved urgently in the current technical field. Summary of the invention

[0003] The purpose of the present invention is to provide a box-type breakwater-semi-submersible photovoltaic platform-pendulum wave energy integrated device, which is an integrated system combining a semi-submersible photovoltaic platform array, a box-type floating breakwater and a pendulum wave energy device, and utilizes the wave-breaking performance of the floating breakwater to improve the movement stability of the photovoltaic floating body while reducing costs; at the same time, a pendulum wave energy device with a wave energy converter (PTO) system is placed at the connection of the floating body, so as to achieve multi-energy complementary power generation of the integrated system while further improving the movement stability of the floating body.

[0004] To achieve the above-mentioned purpose, the present invention provides a box-type breakwater-semi-submersible photovoltaic platform-pendulum wave energy integrated device, including a plurality of box-type breakwaters, a plurality of semi-submersible floating photovoltaic platforms are connected to the rear end of the box-type breakwater, mooring structures are arranged in the semi-submersible floating photovoltaic platforms at both ends, the semi-submersible floating photovoltaic platforms in the vertical direction are connected by the pendulum wave energy device, and the semi-submersible floating photovoltaic platforms in the horizontal direction are connected by a flexible connection structure.

[0005] Preferably, the interior of the pendulum wave energy device is configured as a wave energy converter structure, including an upper hydraulic cylinder, a hydraulic energy storage device and a lower hydraulic cylinder. One end of the pendulum wave energy device is arranged in contact with the semi-submersible floating photovoltaic platform, and the other end is connected to the adjacent semi-submersible floating photovoltaic platform through a hose led out from the upper hydraulic cylinder and the lower hydraulic cylinder.

[0006] Preferably, the flexible connection structure specifically includes a spherical hinge, and both ends of the spherical hinge are connected to the adjacent semi-submersible floating photovoltaic platform through a top plate.

[0007] Preferably, a relative pitching motion occurs between the semi-submersible floating photovoltaic platform and the pendulum wave energy device, and the motion of the semi-submersible floating photovoltaic platform is restricted by the pendulum wave energy. The formula is as follows:

[0008]

[0009] b hinge +b vis =b PTO

[0010] In the above formula, ω represents the angular frequency of the incident wave, M is the mass matrix of the box-shaped breakwater and the semi-submersible floating photovoltaic platform, and C(X) represents the constraint relationship of the semi-submersible floating photovoltaic platform; a ij represents the additional mass matrix of 6n×6n in the semi-submersible floating photovoltaic platform, where i and j represent rows and columns respectively; n represents the total number of the box-shaped breakwater and the semi-submersible floating photovoltaic platform; b PTO represents the damping coefficient matrix of the wave energy converter structure, b hinge represents the damping matrix of the pendulum wave energy device, b vis is the viscosity damping matrix of the pendulum wave energy device, k r is the hydrostatic restoring force matrix; k m is the equivalent mooring force stiffness matrix, k hinge represents the stiffness coefficient of the pendulum wave energy device; ξ is the 1×6n vector of the system motion response; F ex is the 6n×1 vector of the wave exciting force acting on the device; f L is the moment generated by the constraint between the floating bodies, which is a 5n×1 matrix.

[0011] Preferably, the formula for the constraint relationship of the semi-submersible floating photovoltaic platform is as follows:

[0012] C(X)=[C1(X)C2(X)C3(X)C4(X)C5(X)] T =0

[0013] In the above formula, C i (X) represents the constraints of five degrees of freedom except pitching, i is a calculation parameter, and the value range is 1-5. C i (X) is the 5×6n linear constraint Jacobian matrix of C(X).

[0014] Preferably, the photovoltaic power generation on the semi-submersible floating photovoltaic platform is calculated by the following empirical formula:

[0015] PL=sin(apitch )

[0016] PS = A × G

[0017] PW solar = PS × (1 - PL)

[0018] In the above formula, PL is the power loss of photovoltaic power generation under wave action, a pitch is the pitch amplitude of the photovoltaic; PS is the photovoltaic power generation power under calm water surface; A is the area of the photovoltaic panel; G is the solar radiation intensity; PW solar is the average photovoltaic power generation power.

[0019] Preferably, the power generation power of the pendulum wave energy device is calculated according to the following formula:

[0020]

[0021] In the above formula, PW wave represents the power generation power of the pendulum wave energy device; is the angular displacement difference between adjacent floating bodies connected by the pendulum wave energy device.

[0022] Therefore, the present invention adopts the above-mentioned integrated device of box-shaped breakwater - semi-submersible photovoltaic platform - pendulum wave energy, and has the following advantages:

[0023] (1) In the present invention, the limitation of the performance of a single photovoltaic floating body structure is broken through, the semi-submersible photovoltaic platform is combined with the box-shaped breakwater, and the interaction between the deep draft stability of the semi-submersible structure and the shallow water response characteristics of the box-shaped structure is utilized to improve the overall stability of the integrated system while saving the overall construction cost.

[0024] (2) In the present invention, the arrays are connected by flexible connectors, and the spherical hinges in the flexible connectors can enable the floating bodies to perform relative pitch motion when affected by waves, dissipate wave energy through the motion, which can not only effectively reduce the force on the connectors, improve the durability and stability of the system, but also promote the efficient capture of wave energy.

[0025] (3) The present invention utilizes the complementarity of solar energy and wave energy in time distribution, breaks through the time limitation of solar power generation, can realize peak-shifting and collaborative power generation, and at the same time the integrated system can share the mooring system, reducing the construction and operation and maintenance costs.

[0026] The technical solution of the present invention will be further described in detail below through the drawings and embodiments. Description of the Drawings

[0027] Figure 1 is the overall structural schematic diagram of an integrated device of box-shaped breakwater - semi-submersible photovoltaic platform - pendulum wave energy of the present invention;

[0028] Figure 2 This is a side view of an integrated device of a box - type breakwater - semi - submersible photovoltaic platform - pendulum wave energy of the present invention;

[0029] Figure 3 This is a top view of the semi - submersible floating photovoltaic platform in an integrated device of a box - type breakwater - semi - submersible photovoltaic platform - pendulum wave energy of the present invention;

[0030] Figure 4 This is a cross - sectional view of the pendulum wave energy device in an integrated device of a box - type breakwater - semi - submersible photovoltaic platform - pendulum wave energy of the present invention;

[0031] Figure 5 This is a schematic structural view of the flexible connection structure in an integrated device of a box - type breakwater - semi - submersible photovoltaic platform - pendulum wave energy of the present invention;

[0032] Reference numerals: 1. Box - type breakwater; 2. Semi - submersible floating photovoltaic platform; 2 - 1. Photovoltaic panel; 3. Pendulum wave energy device; 3 - 1. Upper hydraulic cylinder; 3 - 2. Hydraulic energy storage device; 3 - 3. Lower hydraulic cylinder; 3 - 4. Hose; 4. Flexible connection structure; 4 - 1. Top plate; 4 - 2. Spherical hinge; 5. Mooring structure. Detailed implementation manners

[0033] To make the objectives, 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 with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. Usually, 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, etc. The specific selection and calculation device adopts the existing technology in the art, so it will not be elaborated in detail.

[0034] Embodiment

[0035] As Figures 1-5As shown in the figure, the present invention provides a box - type breakwater - semi - submersible photovoltaic platform - pendulum - type wave energy integrated device, including a number of box - type breakwaters 1. The box - type breakwaters 1 can reduce wave energy and the movement of the rear semi - submersible floating photovoltaic platform 2. The rear end of the box - type breakwater 1 is connected to a number of semi - submersible floating photovoltaic platforms 2. A horizontally - arranged photovoltaic panel 2 - 1 is provided on the semi - submersible floating photovoltaic platform 2. A plurality of semi - submersible floating photovoltaic platforms 2 form an array. Mooring structures 5 are arranged in both of the semi - submersible floating photovoltaic platforms at both ends. The mooring structure specifically includes a mooring cable and an anchor block connected in sequence. The anchor block is borne in water, and the other end of the mooring cable is connected to the semi - submersible floating photovoltaic platform 2. The semi - submersible floating photovoltaic platforms 2 in the vertical direction are connected by a pendulum - type wave energy device 3;

[0036] The pendulum - type wave energy device 3 internally includes an upper hydraulic cylinder 3 - 1, a hydraulic energy storage device 3 - 2, and a lower hydraulic cylinder 3 - 3. The upper hydraulic cylinder 3 - 1 and the lower hydraulic cylinder 3 - 3 supply energy to the hydraulic energy storage device 3 - 2. One end of the pendulum - type wave energy device 3 is arranged in contact with the semi - submersible floating photovoltaic platform 2, and the other end is connected to the adjacent semi - submersible floating photovoltaic platform through a hose 3 - 4 led out from the upper hydraulic cylinder 3 - 1 and the lower hydraulic cylinder 3 - 3. The internal structure of the pendulum - type wave energy device 3 forms a PTO device. During the movement of the adjacent semi - submersible floating photovoltaic platforms 2, the hose 3 - 4 drives the upper hydraulic cylinder 3 - 1 and the lower hydraulic cylinder 3 - 3 to move for power generation.

[0037] The semi - submersible floating photovoltaic platforms 2 in the horizontal direction are connected by a flexible connection structure 4. The flexible connection structure 4 specifically includes a spherical hinge 4 - 2. Both ends of the spherical hinge 4 - 2 are connected to the adjacent semi - submersible floating photovoltaic platform 2 through a top plate 4 - 1. The spherical hinge enables the device to have a pitching relative movement when affected by waves, and the flexible design can avoid partial fracture of the connection structure.

[0038] A relative pitching movement occurs between the semi - submersible floating photovoltaic platform and the pendulum - type wave energy device. The movement of the semi - submersible floating photovoltaic platform is restricted by the pendulum - type wave energy. The formula is as follows:

[0039]

[0040] b hinge +b vis =b PTO

[0041] In the above formula, ω represents the angular frequency of the incident wave, M is the mass matrix of the box - type breakwater and the semi - submersible floating photovoltaic platform, and C(X) represents the constraint relationship of the semi - submersible floating photovoltaic platform; a ij represents the 6n×6n added mass matrix in the semi - submersible floating photovoltaic platform, where i and j respectively represent rows and columns; n represents the total number of the box - type breakwater and the semi - submersible floating photovoltaic platform; bPTO Denotes the damping coefficient matrix of the wave energy converter structure, b hinge Denotes the damping matrix of the pendulum wave energy device, b vis Is the viscous damping matrix of the pendulum wave energy device, k r Is the hydrostatic restoring force matrix; k m Is the equivalent mooring force stiffness matrix, k hinge Represents the stiffness coefficient of the pendulum wave energy device; ξ is the 1×6n vector of the system motion response; F ex Is the 6n×1 vector of the wave exciting force acting on the device; f L Is the moment generated by the constraint between the floating bodies, which is a 5n×1 matrix.

[0042] The formula for the constraint relationship of the semi-submersible floating PV platform is as follows:

[0043] C(X) = [C1(X) C2(X) C3(X) C4(X) C5(X)] T = 0

[0044] In the above formula, C i (X) represents the constraints of the five degrees of freedom except pitching, i is the calculation parameter, and the value range is 1-5. C i (X) is the 5×6n linear constraint Jacobian matrix of C(X).

[0045] The photovoltaic power generation on the semi-submersible floating PV platform is calculated by the following empirical formula:

[0046] PL = sin(a pitch )

[0047] PS = A × G

[0048] PW solar = PS × (1 - PL)

[0049] In the above formula, PL is the photovoltaic power generation loss under wave action, a pitch Is the pitching amplitude of the photovoltaic; PS is the photovoltaic power generation under the still water surface; A is the area of the photovoltaic panel; G is the solar radiation intensity; PW solar Is the average photovoltaic power generation.

[0050] The power generation of the pendulum wave energy device is calculated according to the following formula:

[0051]

[0052] In the above formula, PW wave Represents the power generation of the pendulum wave energy device; Is the difference in angular displacement of adjacent floating bodies connected by the pendulum wave energy device.

[0053] In specific tests, the power generation of the photovoltaic panel and the pendulum wave energy device is as follows:

[0054]

[0055]

[0056] The specific working process is as follows: The box-shaped breakwater is combined with the semi-submersible floating photovoltaic platform to form an array. The arrays are formed into a matrix integration system through a flexible connection structure. The device is connected to the seabed anchor block fixed by a mooring cable to form the fixation of the device. When the wave acts, the box-shaped breakwater cuts down the wave energy and reduces the movement of the rear semi-submersible photovoltaic platform. The photovoltaic panel above the semi-submersible photovoltaic platform captures solar energy for power generation. At the same time, within the movement range of the spherical hinge, the floating body can perform relative pitching motion following the waves, driving the pendulum wave energy device to capture wave energy. The structure inside the pendulum wave energy device can further reduce the movement of the floating body platform, increase the solar power generation efficiency, realize the coordinated power generation of the integration system, and at the same time, the damping and stiffness of the pendulum wave energy can be preset according to the actual sea conditions to increase the overall power generation efficiency and stability of the integration system.

[0057] Therefore, the present invention adopts a box-shaped breakwater - semi-submersible photovoltaic platform - pendulum wave energy integration device, which avoids the limitations of a single photovoltaic floating body structure, combines the advantages of the semi-submersible floating photovoltaic platform and the box-shaped floating body to optimize the structural stability and energy utilization efficiency. The semi-submersible floating photovoltaic platform, with a smaller waterline area and a deeper draft, can improve the anti-overturning ability of the device and reduce the motion response caused by wave loads. The box-shaped floating body relies on a larger wave-facing area to effectively attenuate the incident waves. Combined with the PTO system, it realizes additional wave energy capture. The hydrodynamic characteristics of the array are optimized by the reasonable layout of the two floating bodies, improving the comprehensive energy utilization efficiency while ensuring the structural stability. At the same time, flexible connectors are used to connect between the semi-submersible floating photovoltaic platforms. The spherical hinge in the flexible connector can enable the floating body to perform relative pitching motion when affected by waves, avoiding the loosening of the connection structure. Finally, taking advantage of the complementarity of solar energy and wave energy in time distribution, it breaks through the time limitation of solar power generation and realizes peak-shifting and coordinated power generation. At the same time, the integration system can share the mooring system, reducing the construction and operation and maintenance costs.

[0058] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that they can still modify or equivalently replace the technical solutions of the present invention, and these modifications or equivalent replacements cannot make the modified technical solutions deviate from the spirit and scope of the technical solutions of the present invention.

Claims

1. A box-shaped breakwater - semi-submersible photovoltaic platform - pendulum wave energy integrated device, characterized in that: It includes a number of box-shaped breakwaters, and several semi-submersible floating PV platforms are connected to the rear ends of the box-shaped breakwaters. Mooring structures are provided in the semi-submersible floating PV platforms at both ends. The semi-submersible floating PV platforms in the vertical direction are connected by pendulum wave energy devices, and the semi-submersible floating PV platforms in the horizontal direction are connected by flexible connection structures.

2. The integrated device of a box-shaped breakwater - semi-submersible photovoltaic platform - pendulum wave energy according to claim 1, wherein: The interior of the pendulum wave energy device is set as a wave energy converter structure, which includes an upper hydraulic cylinder, a hydraulic energy storage device, and a lower hydraulic cylinder. One end of the pendulum wave energy device is arranged in contact with the semi-submersible floating PV platform, and the other end is connected to the adjacent semi-submersible floating PV platform through hoses led out from the upper hydraulic cylinder and the lower hydraulic cylinder.

3. A box-shaped breakwater - semi-submersible photovoltaic platform - pendulum wave energy integrated device according to claim 2, characterized in that: The flexible connection structure specifically includes a spherical hinge, and both ends of the spherical hinge are connected to the adjacent semi-submersible floating PV platform through top plates.

4. A box-shaped breakwater - semi-submersible photovoltaic platform - pendulum wave energy integrated device according to claim 3, characterized in that: Relative pitching motion occurs between the semi-submersible floating PV platform and the pendulum wave energy device, and the motion of the semi-submersible floating PV platform is restricted by the pendulum wave energy. The formula is as follows: b hinge +b vis =b PTO In the above formula, ω represents the angular frequency of the incident wave, M is the mass matrix of the box - type breakwater and the semi - submersible floating photovoltaic platform, and C(X) represents the constraint relationship of the semi - submersible floating photovoltaic platform; a ij represents the 6n×6n added mass matrix in the semi - submersible floating photovoltaic platform, where i and j represent rows and columns respectively; n represents the total number of the box - type breakwater and the semi - submersible floating photovoltaic platform; b PTO represents the damping coefficient matrix of the wave energy converter structure, b hinge represents the damping matrix of the pendulum - type wave energy device, b vis is the viscous damping matrix of the pendulum - type wave energy device, k r is the hydrostatic restoring force matrix; k m is the equivalent mooring force stiffness matrix, k hinge represents the stiffness coefficient of the pendulum - type wave energy device; ξ is the 1×6n vector of the system motion response; F ex is the 6n×1 vector of the wave exciting force acting on the device; f L is the moment generated by the constraint between floating bodies, which is a 5n×1 matrix.

5. A box-shaped breakwater - semi-submersible photovoltaic platform - pendulum wave energy integrated device according to claim 4, characterized in that: The formula for the constraint relationship of the semi-submersible floating PV platform is as follows: C(X) = [C1(X) C2(X) C3(X) C4(X) C5(X)] T = 0 In the above formula, C i (X) represents the constraints of five degrees of freedom other than pitching. i is a calculation parameter, and its value range is 1 - 5. C i (X) is the 5×6n linear constraint Jacobian matrix of C(X).

6. A box - type breakwater - semi - submersible photovoltaic platform - pendulum - type wave energy integrated device according to claim 5, characterized in that: The photovoltaic power generation power on the semi-submersible floating PV platform is calculated by the following empirical formula: PL = sin(a pitch ) PS = A × G PW solar = PS × (1 - PL) In the above formula, PL is the power generation loss of photovoltaic power generation under wave action, and a pitch is the pitching amplitude of the photovoltaic; PS is the power generation power of photovoltaic power generation under the still water surface; A is the area of the photovoltaic panel; G is the solar radiation intensity; PW solar is the average power generation power of the photovoltaic.

7. An integrated device of a box-shaped breakwater - semi-submersible photovoltaic platform - pendulum wave energy according to claim 6, characterized in that: The power generation power of the pendulum wave energy device is calculated according to the following formula: In the above formula, PW wave represents the power generation power of the pendulum wave energy device; is the angular displacement difference between adjacent floating bodies connected by the pendulum wave energy device.

Images