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

Abstract

The application discloses a box-type breakwater-semi-submersible photovoltaic platform-pendulum wave energy integrated device, and belongs to the technical field of offshore power generation devices. The device comprises a plurality of box-type breakwaters, the rear end of each box-type breakwater is connected with a plurality of semi-submersible floating photovoltaic platforms, a mooring structure is arranged in each semi-submersible floating photovoltaic platform at two ends, the semi-submersible floating photovoltaic platforms in the vertical direction are connected through pendulum wave energy devices, and the semi-submersible floating photovoltaic platforms in the horizontal direction are connected through flexible connection structures. The device is used for realizing collaborative power generation of wave energy and solar energy, complementing multiple energies, breaking through the limitation of single photovoltaic platforms in power generation time, and further inhibiting the motion response of the floating body in the time of capturing wave energy, improving the stability of the device, and further improving the management efficiency.

Description

Technical Field

[0001] This 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 Technology

[0002] Ocean energy, as an important renewable energy source, has enormous development potential. Solar photovoltaic (PV) power generation, as one of the most mature clean energy technologies, also possesses significant advantages in marine environments due to its cleanliness, efficiency, and sustainability. However, the operation and maintenance of combined PV and wave energy power generation systems face numerous challenges in the complex marine environment. The strong movement of waves, strong winds, and the corrosiveness of seawater all threaten the stability of the system and the durability of the equipment. Frequent wave impacts can lead to structural fatigue or damage to wave energy conversion devices, increasing system maintenance costs. Since PV systems are installed on floating hulls, the movement of the hull caused by waves makes it difficult to maintain a stable angle of sunlight received by the PV panels, thus affecting power generation efficiency. How to maintain the efficient operation and long-term stability of PV and wave energy systems in harsh marine environments has become a pressing problem to be solved in the current technological field. Summary of the Invention

[0003] The purpose of this invention is to provide an integrated system combining a box-type breakwater, a semi-submersible photovoltaic platform, and a pendulum wave energy device. This system utilizes the wave-damping performance of the floating breakwater to improve the motion stability of the photovoltaic float while reducing costs. Simultaneously, a pendulum wave energy device with a wave energy converter (PTO) system is placed at the connection point of the float, further improving the motion stability of the float and enabling multi-energy complementary power generation of the integrated system.

[0004] To achieve the above objectives, the present invention provides a box-type breakwater-semi-submersible photovoltaic platform-pendulum wave energy integrated device, comprising several box-type breakwaters, with several semi-submersible floating photovoltaic platforms connected to the rear ends of the box-type breakwaters. Mooring structures are provided in the semi-submersible floating photovoltaic platforms at both ends. The semi-submersible floating photovoltaic platforms in the vertical direction are connected by a 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 pendulum wave energy device is internally 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 attached to the semi-submersible floating photovoltaic platform, and the other end is connected to the adjacent semi-submersible floating photovoltaic platform through hoses drawn from the upper and lower hydraulic cylinders.

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

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

[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-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 This represents a 6n×6n additional mass matrix in a semi-submersible floating photovoltaic platform, where i and j represent rows and columns, respectively; n represents the total number of box-type breakwaters and semi-submersible floating photovoltaic platforms; b PTO The damping coefficient matrix of the wave energy converter structure, b hinge The damping matrix of the pendulum wave energy device is represented by b. vis It is the viscosity damping matrix of the pendulum wave energy device, k r It is the water purification resilience matrix; k m It is the equivalent mooring force stiffness matrix, k hinge ξ represents the stiffness coefficient of the pendulum wave energy device; ξ is a 1×6n vector of the system's motion response; F ex It is a 6n×1 vector of wave excitation force acting on the device; f L It is the torque generated by the constraint between the floating bodies, which is a 5n×1 matrix.

[0011] The preferred 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 five degrees of freedom constraints excluding pitch, i is a calculation parameter with a value range of 1-5, and C i (X) is the 5×6n linearly constrained Jacobian matrix of C(X).

[0014] Preferably, the photovoltaic power generation capacity of a semi-submersible floating photovoltaic platform is calculated using the following empirical formula:

[0015] PL = sin(apitch )

[0016] PS = A × G

[0017] PW solar =PS×(1-PL)

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

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

[0020]

[0021] In the above formula, PW wave This indicates the power generation capacity of the pendulum wave energy device; The difference in angular displacement between adjacent floating bodies connected by a pendulum wave energy device.

[0022] Therefore, the present invention employs the above-mentioned box-type breakwater-semi-submersible photovoltaic platform-pendulum wave energy integrated device, which has the following advantages:

[0023] (1) In this invention, the limitations of a single photovoltaic floating structure in terms of performance are overcome. A semi-submersible photovoltaic platform is combined with a box-type breakwater. The interaction between the deep draft stability of the semi-submersible structure and the shallow water response characteristics of the box-type structure is utilized to improve the overall stability of the integrated system while saving overall construction costs.

[0024] (2) In this invention, the arrays are connected by a flexible connector. The spherical hinge in the flexible connector can cause the float to roll relative to the waves when it is subjected to waves. By dissipating wave energy through the movement, the stress on the connector can be effectively reduced, the durability and stability of the system can be improved, and the efficient capture of wave energy can be promoted.

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

[0026] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the overall structure of a box-type breakwater-semi-submersible photovoltaic platform-pendulum wave energy integrated device according to the present invention;

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

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

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

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

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

[0033] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations. Specific model specifications need to be selected and determined according to the actual specifications of the device, etc. The specific selection calculation device adopts existing technology in the art, and therefore will not be described in detail.

[0034] Example

[0035] like Figures 1-5As shown, the present invention provides a box-type breakwater-semi-submersible photovoltaic platform-pendulum wave energy integrated device, including several box-type breakwaters 1. The box-type breakwaters 1 can reduce wave energy and reduce the movement of the semi-submersible floating photovoltaic platform 2 behind them. Several semi-submersible floating photovoltaic platforms 2 are connected to the rear end of the box-type breakwaters 1. Horizontally arranged photovoltaic panels 2-1 are set on the semi-submersible floating photovoltaic platforms 2. Multiple semi-submersible floating photovoltaic platforms 2 form an array. Mooring structures 5 are set in the semi-submersible floating photovoltaic platforms 2 at both ends. The mooring structure specifically includes a mooring cable and an anchor block connected in sequence. The anchor block is supported in the water. 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 wave energy device 3.

[0036] The pendulum wave energy device 3 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 power to the hydraulic energy storage device 3-2. One end of the pendulum wave energy device 3 is attached to 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 wave energy device 3 forms a PTO device. During the movement of the adjacent semi-submersible floating photovoltaic platform 2, the hose 3-4 drives the upper hydraulic cylinder 3-1 and the lower hydraulic cylinder 3-3 to move and generate electricity.

[0037] The horizontally oriented semi-submersible floating photovoltaic platforms 2 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 allows the device to undergo relative pitching motion when subjected to waves. The flexible design can prevent the connection structure from breaking.

[0038] A relative pitching motion occurs between the semi-submersible floating photovoltaic platform and the pendulum wave energy device. The motion of the semi-submersible floating photovoltaic platform is limited by the pendulum wave energy device, as shown in the following formula:

[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 This represents a 6n×6n additional mass matrix in a semi-submersible floating photovoltaic platform, where i and j represent rows and columns, respectively; n represents the total number of box-type breakwaters and semi-submersible floating photovoltaic platforms; bPTO The damping coefficient matrix of the wave energy converter structure, b hinge The damping matrix of the pendulum wave energy device is represented by b. vis It is the viscosity damping matrix of the pendulum wave energy device, k r It is the water purification resilience matrix; k m It is the equivalent mooring force stiffness matrix, k hinge ξ represents the stiffness coefficient of the pendulum wave energy device; ξ is a 1×6n vector of the system's motion response; F ex It is a 6n×1 vector of wave excitation force acting on the device; f L It is the torque generated by the constraint between the floating bodies, which is a 5n×1 matrix.

[0042] The formula for the constraint relationship of a semi-submersible floating photovoltaic 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 five degrees of freedom constraints excluding pitch, i is a calculation parameter with a value range of 1-5, and C i (X) is the 5×6n linearly constrained Jacobian matrix of C(X).

[0045] The photovoltaic power generation capacity of a semi-submersible floating photovoltaic platform is calculated using 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 represents the photovoltaic power loss under wave action, and a pitch PS is the pitch amplitude of the photovoltaic panel; PS is the photovoltaic power generation under still water surface; A is the area of ​​the photovoltaic panel; G is the solar radiation intensity; PW solar This represents the average power generation of photovoltaic power.

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

[0051]

[0052] In the above formula, PW wave This indicates the power generation capacity of the pendulum wave energy device; The difference in angular displacement between adjacent floating bodies connected by a pendulum wave energy device.

[0053] The specific experimental results show the following power generation from photovoltaic panels and pendulum wave energy devices:

[0054]

[0055]

[0056] The specific working process is as follows: A box-shaped breakwater and a semi-submersible floating photovoltaic platform are combined to form an array. The arrays are connected by a flexible structure to form a matrix integrated system. The device is connected to anchor blocks fixed on the seabed by mooring cables to fix the device. When waves act, the box-shaped breakwater reduces wave energy and decreases the movement of the semi-submersible photovoltaic platform behind it. The photovoltaic panels above the semi-submersible photovoltaic platform capture solar energy to generate electricity. At the same time, the floating body, within the range of motion of the spherical hinge, can follow the waves and undergo relative pitching motion, driving the pendulum wave energy device to capture wave energy. The internal structure of the pendulum wave energy device can further reduce the movement of the floating platform, increase the efficiency of solar power generation, and realize the coordinated power generation of the integrated system. At the same time, the damping and stiffness of the pendulum wave energy device can be preset according to the actual sea conditions to increase the overall power generation efficiency and stability of the integrated system.

[0057] Therefore, this invention employs a box-type breakwater-semi-submersible photovoltaic platform-pendulum wave energy integrated device, avoiding the limitations of a single photovoltaic floating structure. It combines the advantages of a semi-submersible floating photovoltaic platform and a box-type floating body to optimize structural stability and energy utilization efficiency. The semi-submersible floating photovoltaic platform, with its smaller waterline area and deeper draft, improves the device's anti-overturning capability and reduces motion response caused by wave loads. The box-type floating body, relying on its larger wave-facing area, effectively attenuates incident waves. Combined with a PTO system, it achieves additional wave energy capture. The two types of floating bodies are rationally arranged to optimize the hydrodynamic characteristics of the array, improving overall energy utilization efficiency while ensuring structural stability. Simultaneously, flexible connectors are used between the semi-submersible floating photovoltaic platforms. The spherical hinges within these connectors allow the floating bodies to undergo relative pitching motion when subjected to waves, preventing the connection structure from loosening. Finally, by utilizing the complementarity of solar and wave energy in temporal distribution, the time limitations of solar power generation are overcome, achieving staggered and coordinated power generation. Furthermore, the integrated system can share a mooring system, reducing construction 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 not to limit them. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the technical solutions of the present invention, and these modifications or equivalent substitutions cannot cause the modified technical solutions to deviate from the spirit and scope of the technical solutions of the present invention.

Claims

1. A box-type breakwater-semi-submersible photovoltaic platform-pendulum wave energy integrated device, characterized in that: It includes several box-shaped breakwaters, and the rear end of each box-shaped breakwater is connected to several semi-submersible floating photovoltaic platforms. Each of the semi-submersible floating photovoltaic platforms at both ends is equipped with a mooring structure. The semi-submersible floating photovoltaic platforms in the vertical direction are connected by a pendulum wave energy device, and the semi-submersible floating photovoltaic platforms in the horizontal direction are connected by a flexible connection structure. The pendulum wave energy device is internally 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 attached to the semi-submersible floating photovoltaic platform, and the other end is connected to the adjacent semi-submersible floating photovoltaic platform through a hose drawn from the upper hydraulic cylinder and the lower hydraulic cylinder. The flexible connection structure specifically includes a spherical hinge, both ends of which are connected to the adjacent semi-submersible floating photovoltaic platform via a top plate. A relative pitching motion occurs between the semi-submersible floating photovoltaic platform and the pendulum wave energy device. The motion of the semi-submersible floating photovoltaic platform is limited by the pendulum wave energy device, as shown in the following formula: ； ； In the above formula, This represents the angular frequency of the incident wave. The mass matrix for box-type breakwaters and semi-submersible floating photovoltaic platforms. This indicates the constraints of a semi-submersible floating photovoltaic platform. This represents the 6n×6n additional mass matrix in a semi-submersible floating photovoltaic platform, where... and These represent rows and columns respectively; n represents the total number of box-type breakwaters and semi-submersible floating photovoltaic platforms; This represents the damping coefficient matrix of the wave energy converter structure. This represents the damping matrix of a pendulum wave energy device. It is the viscosity damping matrix of the pendulum wave energy device. It is the water purification resilience matrix; It is the equivalent mooring force stiffness matrix. The stiffness coefficient of a pendulum wave energy device; It is a 1×6n vector of the system's motion response; It is a 6n×1 vector of wave excitation force acting on the device; It is the torque generated by the constraint between the floating bodies, which is a 5n×1 matrix; The power generation of the pendulum wave energy device is calculated according to the following formula: ； In the above formula, This indicates the power generation capacity of the pendulum wave energy device; The difference in angular displacement between adjacent floating bodies connected by a pendulum wave energy device.

2. The integrated device of box-type breakwater-semi-submersible photovoltaic platform-pendulum wave energy according to claim 1, characterized in that: The formula for the constraint relationship of a semi-submersible floating photovoltaic platform is as follows: In the above formula, This indicates the constraints on the five degrees of freedom other than pitch. The parameter is used for calculation, and its value ranges from 1 to 5. yes The 5×6n linearly constrained Jacobian matrix.

3. The integrated device of box-type breakwater-semi-submersible photovoltaic platform-pendulum wave energy according to claim 2, characterized in that: The photovoltaic power generation capacity of a semi-submersible floating photovoltaic platform is calculated using the following empirical formula: ； ； ； In the above formula, This refers to the power loss of photovoltaic power generation due to wave action. The amplitude of the photovoltaic wave; The photovoltaic power generation capacity under still water surface; The area of ​​the photovoltaic panel; Solar radiation intensity; This represents the average power generation of photovoltaic power.

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