Photovoltaic-pressure difference type wave energy device integrated system

Abstract

The invention discloses a photovoltaic-pressure difference type wave energy device integrated system, and belongs to the technical field of offshore floating photovoltaic equipment.The photovoltaic-pressure difference type wave energy device integrated system comprises a pressure difference type wave energy device and a photovoltaic device, the pressure difference type wave energy device comprises a contraction water channel, the two sides of the contraction water channel are connected with the photovoltaic device, and a bidirectional through-flow turbine is arranged in the contraction water channel; the bidirectional through-flow turbine is of a symmetrical structure and comprises a rotating shaft, generators are installed at the two ends of the rotating shaft, a rotating wheel is installed in the middle of the rotating shaft, guide wheels are installed on the two sides of the rotating wheel, and speed increasers are installed between the guide wheels and the generators. By the adoption of the photovoltaic-pressure difference type wave energy device integrated system, cooperative power generation of solar energy and wave energy is achieved, more stable energy output can be provided, the overall power generation efficiency of the system is improved, the motion response of the integrated system is reduced, then the overall stability and reliability of the structure are improved, the service life of the integrated system is prolonged, and the cost is reduced. And the maintenance and operation cost can be reduced.

Description

Technical Field

[0001] The invention relates to the technical field of offshore floating photovoltaic equipment, and in particular to a photovoltaic-pressure difference wave energy device integrated system. Background Art

[0002] With the growth of global energy demand and the improvement of environmental awareness, the marine energy industry has developed rapidly. The development of marine energy such as offshore photovoltaics and wave energy is of great significance to alleviate the contradiction between supply and demand of traditional energy and accelerate energy conversion. However, both offshore photovoltaic and wave energy devices have been subjected to wave loads for a long time, especially in extreme sea conditions, and will be subjected to strong impacts, which is not conducive to the stability and efficiency of power generation. The high cost problem is also an important factor restricting the development of offshore photovoltaics and wave energy, which is mainly due to the high cost of construction, maintenance and mooring. Offshore photovoltaic panels and wave energy converters need to use corrosion-resistant and salt spray-resistant materials, which are often expensive. At the same time, the complexity and risk of offshore operations also greatly increase the cost of installation, maintenance and repair. Therefore, a photovoltaic-pressure difference wave energy device integrated system is proposed, which can reduce the motion response of the integrated system, improve the overall power generation efficiency of the system, and reduce the cost. Summary of the invention

[0003] The purpose of the present invention is to provide a photovoltaic-pressure difference wave energy device integrated system, which realizes the coordinated power generation of solar energy and wave energy, can provide more stable energy output, and improve the overall power generation efficiency of the system. While generating electricity by pressure difference, the sloshing of water tanks is used to consume wave energy, thereby reducing the motion response of the integrated system, thereby improving the overall stability and reliability of the structure, increasing the service life of the integrated system, and helping to reduce maintenance and operation costs.

[0004] To achieve the above-mentioned purpose, the present invention provides a photovoltaic-pressure difference wave energy device integrated system, including a pressure difference wave energy device and a photovoltaic device. The pressure difference wave energy device includes a contraction water channel, and both sides of the contraction water channel are connected to the photovoltaic device. A bidirectional cross-flow turbine is arranged in the contraction water channel. The bidirectional cross-flow turbine is a symmetrical structure. The bidirectional cross-flow turbine includes a rotating shaft, generators are installed at both ends of the rotating shaft, a runner is installed in the middle of the rotating shaft, guide wheels are installed on both sides of the runner, and a speed increaser is installed between the guide wheel and the generator.

[0005] Preferably, the two photovoltaic devices have the same structure, and the photovoltaic devices include photovoltaic floats, and water tanks are provided at the bottom of the photovoltaic floats. The water tanks are rectangular parallelepipeds, and the two water tanks are connected to the contraction water channel.

[0006] Preferably, retractable support rods are installed at the four corners of the tops of the two photovoltaic floating bodies, and the tops of the four retractable support rods are hinged to the photovoltaic panels.

[0007] Preferably, a mooring ring is fixed to the bottom of the photovoltaic floating body, and the mooring ring is connected to the anchor block through a mooring cable.

[0008] Preferably, the dimensions of the two ends of the contraction water channel are larger than the middle dimension, the two sides of the contraction water channel are square, and the middle part is cylindrical.

[0009] Preferably, the constrained motion equation of the photovoltaic-pressure difference wave energy device integrated system is expressed as:

[0010]

[0011] Where ω represents the angular frequency of the incident wave; a = a jj and b = b jj is the 12×12 additional mass matrix and radiation damping matrix; b vis is the viscosity damping matrix; k r is the water recovery matrix; k m is the equivalent mooring force stiffness matrix; b hinge and k hinge represent the damping and stiffness coefficients of the articulated connector, respectively; ξ is a 1×12 vector of the system motion response; F ex is the 12×1 vector of the wave excitation force acting on the system; f L is the moment generated by the constraints between the floating bodies, which is a 10×1 matrix, where M represents the mass of the floating body and i represents the imaginary unit. represents the transformed rank matrix of the linear constraint matrix;

[0012] The constraint relationship of the photovoltaic-pressure difference wave energy device integrated system is expressed as:

[0013] C(X)=[C 1 (X) C 2 (X) C 3 (X) C 4 (X) C 5 (X)] T =0;

[0014] Among them, C i (X) is the 5×12 linear constraint Jacobian matrix of C(X), C i (X) Constrain the five degrees of freedom except pitch; C(X) and C i (X) can be expressed by multibody dynamics.

[0015] Therefore, the present invention adopts the above photovoltaic-pressure difference wave energy device integrated system, which has the following beneficial effects:

[0016] 1) The present invention innovatively proposes to combine the pressure difference wave energy device with offshore photovoltaics, realizing the synergistic power generation of solar energy and wave energy. The pressure difference wave energy device makes up for the shortcoming that photovoltaics cannot generate electricity under the condition of no sunshine. The advantage of this integrated system is that it can provide more stable energy output, reduce the difficulty of rectification, and improve the overall power generation efficiency of the system. Photovoltaic and pressure difference wave energy devices share infrastructure such as power grids and moorings, which can also effectively reduce costs.

[0017] 2) The photovoltaic panels of the present invention are placed above the photovoltaic float through retractable support rods. The retractable support rods can flexibly adjust the height and inclination of the photovoltaic panels according to the solar altitude angle. This intelligent adjustment mechanism ensures that the photovoltaic panels can track the sun's rays and maintain the best light-receiving position, thereby maximizing the absorption of solar energy and achieving efficient energy conversion.

[0018] 3) There is a rectangular water tank in each of the left and right photovoltaic floats of the present invention, and the two water tanks are interconnected through a contraction waterway. Under the action of waves, the water levels in the left and right water tanks in the photovoltaic float are constantly changing, and the water in the water tanks continuously flows from the high water level water tank to the low water level water tank through the contraction waterway, driving the blades in the bidirectional tubular turbine to rotate and generate electricity. While realizing the use of pressure difference to generate electricity, the sloshing of the water tanks is used to consume wave energy, reducing the motion response of the integrated system, thereby improving the overall stability and reliability of the structure, increasing the service life of the integrated system, and helping to reduce the cost of maintenance and operation.

[0019] 4) The cross-sectional area of ​​the contraction waterway of the present invention decreases from both ends to the middle, and the flow velocity reaches the maximum when the water flows through the central part of the contraction waterway where the cross-sectional area is the smallest. When the water flows through the speed increaser, it will be accelerated twice, and after flowing through the guide wheel for rectification, it will finally flow through the runner, driving the runner blades to rotate and generate electricity. After two accelerations and one rectification, the efficient power generation of the bidirectional tubular turbine can be achieved, which improves the overall power generation efficiency of the system.

[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 It is a three-dimensional structural schematic diagram of a photovoltaic-pressure difference wave energy device integrated system of the present invention;

[0022] Figure 2 It is a schematic structural diagram of a pressure difference wave energy device of a photovoltaic-pressure difference wave energy device integrated system of the present invention;

[0023] Figure 3 It is a structural schematic diagram of a bidirectional tubular turbine of a photovoltaic-pressure difference wave energy device integrated system of the present invention.

[0024] Reference numerals

[0025] 1. Photovoltaic panel; 2. Retractable support rod; 3. Photovoltaic float; 4. Water tank; 5. Contraction waterway; 6. Bidirectional tubular turbine; 61. Speed ​​increaser; 62. Generator; 63. Guide wheel; 64. Impeller; 65. Rotating shaft. DETAILED DESCRIPTION

[0026] The technical solution of the present invention is further described below through the accompanying drawings and embodiments.

[0027] Unless otherwise defined, the technical terms or scientific terms used in the present invention should be understood by people with ordinary skills in the field to which the present invention belongs. The words "first", "second" and similar words used in the present invention do not indicate any order, quantity or importance, but are only used to distinguish different components. "Include" or "comprise" and similar words mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connect" or "connected" and similar words are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0028] Embodiment 1

[0029] like Figures 1 to 3 As shown, the present invention provides a photovoltaic-pressure difference wave energy device integrated system, including a pressure difference wave energy device and a photovoltaic device. The pressure difference wave energy device can convert wave energy into electrical energy, and the photovoltaic device can convert light energy into electrical energy. The pressure difference wave energy device and the photovoltaic device can generate electricity in coordination to provide stable energy output and improve the overall power generation efficiency. The photovoltaic device and the pressure difference wave energy device share infrastructure such as power grids and moorings, which can also effectively reduce costs.

[0030] The pressure difference wave energy device comprises a contraction water channel 5, the dimensions of the two ends of the contraction water channel 5 are larger than the middle dimension, the two sides are square, and the middle part is cylindrical. The size change of the contraction water channel 5 can realize the change of water flow and flow velocity. When the water passes through the central part of the contraction water channel 5 where the cross-sectional area is the smallest, the flow velocity reaches the maximum. The two sides of the contraction water channel 5 are connected to the photovoltaic device, so that the coordinated power generation of the pressure difference wave energy device and the photovoltaic device can be realized.

[0031] A bidirectional tubular turbine 6 is arranged in the contraction waterway 5. When water flows through the contraction waterway 5, the bidirectional tubular turbine 6 can be driven to rotate, thereby converting wave energy into electrical energy. The bidirectional tubular turbine 6 is a symmetrical structure, which includes a rotating shaft 65, generators 62 are installed at both ends of the rotating shaft 65, a runner 64 is installed in the middle of the rotating shaft 65, guide wheels 63 are installed on both sides of the runner 64, and a speed increaser 61 is installed between the guide wheel 63 and the generator 62. When the water passes through the speed increaser 61, it will be accelerated twice, and after flowing through the guide wheel 63 for rectification, it will finally flow through the runner 64, driving the blades of the runner 64 to rotate, thereby driving the generator 62 to generate electricity. After two accelerations and one rectification, the bidirectional tubular turbine 6 can achieve efficient power generation, thereby improving the overall power generation efficiency of the photovoltaic-pressure difference wave energy device integrated system.

[0032] The two photovoltaic devices have the same structure, and the photovoltaic devices include a photovoltaic float 3, and a water tank 4 is provided at the bottom of the photovoltaic float 3. The water tank 4 is a rectangular parallelepiped, and the two water tanks 4 are connected to the contraction waterway 5. When the photovoltaic float 3 fluctuates up and down with the waves, the water in the water tanks 4 of the two photovoltaic floats 3 can flow from the high water level water tank 4 to the low water level water tank 4 through the contraction waterway 5, thereby driving the bidirectional tubular turbine 6 to rotate and generate electricity. While realizing the use of pressure difference to generate electricity, the sloshing of the water tank 4 is used to consume wave energy, reduce the motion response of the integrated system, and thus improve the overall stability and reliability of the structure, increase the service life of the integrated system, and help reduce the cost of maintenance and operation.

[0033] Retractable support rods 2 are installed at the four corners of the top of the two photovoltaic floating bodies 3, and the tops of the four retractable support rods 2 are hinged to the photovoltaic panels 1. The retractable support rods 2 can adjust the height and inclination of the photovoltaic panels 1 according to the solar altitude angle, can track the sun's rays, keep the photovoltaic panels 1 at the best light receiving angle, and achieve efficient energy conversion. A mooring ring is fixed at the bottom of the photovoltaic floating body 3, and the mooring ring is connected to the anchor block through a mooring cable to achieve an anchoring and mooring effect.

[0034] The constrained motion equation of the photovoltaic-pressure difference wave energy device integrated system is expressed as:

[0035]

[0036] Where ω represents the angular frequency of the incident wave; a = a jj and b = b jj is the 12×12 additional mass matrix and radiation damping matrix; b vis is the viscosity damping matrix; k r is the water recovery matrix; k m is the equivalent mooring force stiffness matrix; b hinge and k hinge represent the damping and stiffness coefficients of the articulated connector, respectively; ξ is a 1×12 vector of the system motion response; Fex is the 12×1 vector of the wave excitation force acting on the system; f L is the moment generated by the constraints between the floating bodies, which is a 10×1 matrix, where M represents the mass of the floating body and i represents the imaginary unit. Represents the transrank matrix of the linear constraint matrix.

[0037] The constraint relationship of the photovoltaic-pressure difference wave energy device integrated system is expressed as:

[0038] C(X)=[C 1 (X) C 2 (X) C 3 (X) C 4 (X) C 5 (X)] T =0;

[0039] Among them, C i (X) is the 5×12 linear constraint Jacobian matrix of C(X), C i (X) Constrain the five degrees of freedom except pitch; C(X) and C i (X) can be expressed by multibody dynamics.

[0040] When the photovoltaic-pressure difference wave energy device integrated system provided by the present invention is used, the mooring ring at the bottom of the photovoltaic floating body 3 is fixed to the anchor block through the mooring cable. When there is sunlight, the photovoltaic panel 1 on the top of the photovoltaic floating body 3 can convert light energy into chemical energy. When the height and angle of the sun change, the retractable support rod 2 can be retracted to adjust the height and inclination of the photovoltaic panel 1, track the sun's rays, and maintain the best light receiving position.

[0041] Under the action of waves, the water levels in the left and right water tanks 4 in the photovoltaic float 3 are constantly changing, and the water in the water tanks 4 continuously flows from the high water level tank 4 to the low water level tank 4 through the contraction waterway 5, driving the blades in the bidirectional cross-flow turbine 6 to rotate and generate electricity.

[0042] Therefore, the present invention adopts the above-mentioned photovoltaic-pressure difference wave energy device integrated system to achieve the coordinated power generation of solar energy and wave energy, which can provide more stable energy output, improve the overall power generation efficiency of the system, and use the pressure difference to generate electricity while using the sloshing of the water tank to consume wave energy, thereby reducing the motion response of the integrated system, thereby improving the overall stability and reliability of the structure, increasing the service life of the integrated system, and helping to reduce maintenance and operation costs.

[0043] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that they can still modify or replace the technical solution of the present invention with equivalents, and these modifications or equivalent replacements cannot cause the modified technical solution to deviate from the spirit and scope of the technical solution of the present invention.

Claims

1. A photovoltaic-pressure difference wave energy device integrated system, characterized in that: It includes a pressure difference wave energy device and a photovoltaic device. The pressure difference wave energy device includes a contraction water channel. Both sides of the contraction water channel are connected to the photovoltaic device. A bidirectional cross-flow turbine is arranged in the contraction water channel. The bidirectional cross-flow turbine is a symmetrical structure. The bidirectional cross-flow turbine includes a rotating shaft. Generators are installed at both ends of the rotating shaft. A runner is installed in the middle of the rotating shaft. Guide wheels are installed on both sides of the runner. A speed increaser is installed between the guide wheel and the generator.

2. A photovoltaic-pressure difference wave energy device integrated system according to claim 1, characterized in that: The two photovoltaic devices have the same structure. The photovoltaic devices include photovoltaic floats. Water tanks are provided at the bottom of the photovoltaic floats. The water tanks are rectangular parallelepipeds. Both water tanks are connected to the contraction waterway.

3. A photovoltaic-pressure difference wave energy device integrated system according to claim 2, characterized in that: Retractable support rods are installed at the four corners of the tops of the two photovoltaic floating bodies, and the tops of the four retractable support rods are hinged to the photovoltaic panels.

4. A photovoltaic-pressure difference wave energy device integrated system according to claim 2, characterized in that: A mooring ring is fixed at the bottom of the photovoltaic float, and the mooring ring is connected to the anchor block through a mooring cable.

5. The photovoltaic-pressure difference wave energy device integrated system according to claim 1, characterized in that: The dimensions of the two ends of the contraction water channel are larger than the middle dimension. The two sides of the contraction water channel are square and the middle part is cylindrical.

6. The photovoltaic-pressure difference wave energy device integrated system according to claim 1, characterized in that: The constrained motion equation of the photovoltaic-pressure difference wave energy device integrated system is expressed as: Where ω represents the angular frequency of the incident wave; a = a jj and b = b jj is the 12×12 additional mass matrix and radiation damping matrix; b vis is the viscosity damping matrix; k r is the water recovery matrix; k m is the equivalent mooring force stiffness matrix; b hinge and k hinge represent the damping and stiffness coefficients of the articulated connector, respectively; ξ is a 1×12 vector of the system motion response; F ex is the 12×1 vector of the wave excitation force acting on the system; f L is the moment generated by the constraints between the floating bodies, which is a 10×1 matrix, where M represents the mass of the floating body and i represents the imaginary unit. represents the transformed rank matrix of the linear constraint matrix; The constraint relationship of the photovoltaic-pressure difference wave energy device integrated system is expressed as: C(X)=[C1(X) C2(X) C3(X) C4(X) C5(X)] T =0; Among them, C i (X) is the 5×12 linear constraint Jacobian matrix of C(X), C i (X) Constrain the five degrees of freedom except pitch; C(X) and C i (X) can be expressed by multibody dynamics.

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