Method and device for calculating irradiance received by offshore floating photovoltaic platform

Abstract

The present invention relates to the field of offshore photovoltaic power generation technology, and in particular to a method and device for calculating the irradiance received by an offshore floating photovoltaic platform. The present invention obtains geometric parameters and material properties of the photovoltaic platform, determines a geometric model of the photovoltaic platform based on the geometric parameters and material properties, determines a potential flow-boundary element geometric model of the photovoltaic platform based on the geometric model of the photovoltaic platform, performs simulation using the potential flow-boundary element geometric model of the photovoltaic platform, obtains the velocity potential of the wave field, determines the incident wave force, reflected wave force, and radiated wave force exerted on the photovoltaic platform based on the velocity potential of the wave field, substitutes the incident wave force, reflected wave force, and radiated wave force into a set of equations for the dynamic change of the time-domain tilt angle, determines the tilt angle of the photovoltaic panel of the photovoltaic platform relative to the horizontal plane over time, and then determines the irradiance received by the platform based on the tilt angle. Through the above configuration, the present invention can accurately calculate the irradiance received by the offshore photovoltaic platform.

Description

Technical Field

[0001] The present invention relates to the technical field of offshore photovoltaic power generation, and in particular to a method and device for calculating irradiance received by an offshore floating photovoltaic platform. Background Art

[0002] With the growing global demand for clean energy, offshore photovoltaic platforms, as a crucial component of clean energy development, are becoming a hot topic for research and application. In China, a number of offshore photovoltaic platform projects have been successfully implemented, demonstrating promising development prospects. However, as an emerging offshore structure, offshore photovoltaic platforms present unique structural characteristics and operating environments. Their larger windward area makes them more susceptible to wind loads than traditional offshore structures, requiring special consideration during design and construction.

[0003] Furthermore, because offshore photovoltaic platforms are in motion at sea, existing technologies cannot accurately calculate the irradiance they receive. Accurately obtaining irradiance data is crucial for evaluating the power generation efficiency of offshore photovoltaic platforms, optimizing the layout of photovoltaic modules, and improving energy efficiency.

[0004] Based on this, the present invention proposes a method and device for calculating the irradiance received by an offshore floating photovoltaic platform to solve the problem of how to accurately calculate the irradiance received by the offshore photovoltaic platform. Summary of the Invention

[0005] In order to solve the problem of how to accurately calculate the irradiance received by an offshore photovoltaic platform, an embodiment of the present invention provides a method and device for calculating the irradiance received by an offshore floating photovoltaic platform.

[0006] In a first aspect, an embodiment of the present invention provides a method for calculating the irradiance received by an offshore floating photovoltaic platform, the method comprising:

[0007] Obtain the geometric parameters and material properties of the photovoltaic platform;

[0008] determining a geometric model of the photovoltaic platform based on the geometric parameters and the material properties;

[0009] Determining a potential flow-boundary element geometric model of the photovoltaic platform based on the geometric model of the photovoltaic platform;

[0010] The photovoltaic platform potential flow-boundary element geometric model is used to perform simulation to obtain the velocity potential of the wave field;

[0011] determining incident wave force, reflected wave force, and radiated wave force on the photovoltaic platform based on the velocity potential of the wave field;

[0012] Substituting the incident wave force, the reflected wave force, and the radiated wave force into a time-domain tilt angle dynamic variation equation group to determine the tilt angle of the photovoltaic panels of the photovoltaic platform relative to the horizontal plane as it changes over time; wherein the time-domain tilt angle dynamic variation equation group is constructed using the lift coefficient and drag coefficient of the photovoltaic platform under wind load, and the lift coefficient and the drag coefficient dynamically change according to changes in the pitch angle of the photovoltaic platform;

[0013] Based on the tilt angle, the irradiance received by the platform is determined.

[0014] In a first aspect, an embodiment of the present invention provides a device for calculating irradiance received by an offshore floating photovoltaic platform, comprising:

[0015] An acquisition module is used to obtain the geometric parameters and material properties of the photovoltaic platform;

[0016] a first data processing module, configured to determine a geometric model of the photovoltaic platform based on the geometric parameters and the material properties;

[0017] A second data processing module is used to determine a potential flow-boundary element geometric model of the photovoltaic platform based on the geometric model of the photovoltaic platform;

[0018] A third data processing module is used to perform simulation using the photovoltaic platform potential flow-boundary element geometric model to obtain the velocity potential of the wave field;

[0019] a fourth data processing module, configured to determine incident wave force, reflected wave force, and radiated wave force exerted on the photovoltaic platform based on the velocity potential of the wave field;

[0020] a fifth data processing module, configured to substitute the incident wave force, the reflected wave force, and the radiated wave force into a set of time-domain tilt angle dynamic variation equations to determine the tilt angle of the photovoltaic panels of the photovoltaic platform relative to the horizontal plane as it changes over time; wherein the time-domain tilt angle dynamic variation equations are constructed using the lift coefficient and drag coefficient of the photovoltaic platform under wind load, and the lift coefficient and the drag coefficient dynamically change according to changes in the pitch angle of the photovoltaic platform;

[0021] The sixth data processing unit is configured to determine the irradiance received by the platform based on the tilt angle.

[0022] In a third aspect, an embodiment of the present invention further provides an electronic device, comprising a memory and a processor, wherein the memory stores a computer program, and when the processor executes the computer program, the method described in any embodiment of the present invention is implemented.

[0023] In a fourth aspect, an embodiment of the present invention further provides a computer-readable storage medium having a computer program stored thereon, which, when executed in a computer, causes the computer to execute the method described in any embodiment of the present invention.

[0024] Embodiments of the present invention provide a method and apparatus for calculating the received irradiance of an offshore floating photovoltaic platform. The method begins by collecting the geometric parameters of the photovoltaic platform, including its dimensions, shape, and material properties such as density and elastic modulus. Based on this data, a geometric model of the photovoltaic platform is constructed that reflects the actual situation. This model intuitively represents the physical form of the photovoltaic platform. Subsequently, based on the geometric model, a potential flow-boundary element geometric model of the photovoltaic platform is determined through specific mathematical transformations and boundary condition settings. This model effectively accounts for the interaction between fluid and structure, providing powerful support for simulating the impact of waves on the photovoltaic platform. Using simulation software, the potential flow-boundary element geometric model of the photovoltaic platform is used to perform simulations, thereby determining the velocity potential of the wave field. This velocity potential reflects the energy distribution and flow state of the waves in space and time. Based on the obtained wave field velocity potential, the incident wave force, reflected wave force, and radiated wave force acting on the photovoltaic platform are determined. These three wave forces describe the mechanical effects of waves on the photovoltaic platform from different perspectives and are important parameters for analyzing the platform's motion state. The incident wave force, reflected wave force, and radiated wave force are substituted into the time-domain tilt angle dynamic variation equations. This equation set is constructed based on the lift coefficient and drag coefficient of the photovoltaic platform under wind load, and the lift coefficient and drag coefficient are dynamically adjusted according to the real-time changes in the pitch angle of the photovoltaic platform. This dynamic variation characteristic enables the time-domain tilt angle dynamic variation equation set to more realistically and accurately reflect the motion state of the photovoltaic platform in a complex marine environment, and thus more accurately solve the tilt angle of the photovoltaic panel of the photovoltaic platform with respect to the horizontal plane over time. By accurately grasping the changes in the tilt angle, the accuracy of determining the irradiance received by the platform is significantly improved, providing more reliable data support for the evaluation of the power generation efficiency of the offshore photovoltaic platform and the optimization of the photovoltaic module layout. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0026] Figure 1 A flow chart of a method for calculating irradiance received by an offshore floating photovoltaic platform according to one embodiment is shown;

[0027] Figure 2 This is a hardware architecture diagram of an electronic device provided by an embodiment of the present invention;

[0028] Figure 3 A structural diagram of a device for calculating irradiance received by an offshore floating photovoltaic platform according to one embodiment is shown. DETAILED DESCRIPTION

[0029] 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 the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0030] Please refer to Figure 1 , an embodiment of the present invention provides a method for calculating the irradiance received by an offshore floating photovoltaic platform, the method comprising:

[0031] Step 100: Obtaining geometric parameters and material properties of the photovoltaic platform;

[0032] Step 102: Determine a geometric model of the photovoltaic platform based on geometric parameters and material properties;

[0033] Step 104: Based on the geometric model of the photovoltaic platform, determine the potential flow-boundary element geometric model of the photovoltaic platform;

[0034] Step 106: Use the photovoltaic platform potential flow-boundary element geometric model to perform simulation to obtain the velocity potential of the wave field;

[0035] Step 108: Determine the incident wave force, reflected wave force, and radiated wave force on the photovoltaic platform based on the velocity potential of the wave field;

[0036] Step 110: Substitute the incident wave force, reflected wave force, and radiated wave force into the time-domain tilt angle dynamic variation equations to determine the tilt angle of the photovoltaic panels of the photovoltaic platform relative to the horizontal plane over time; wherein the time-domain tilt angle dynamic variation equations are constructed using the lift coefficient and drag coefficient of the photovoltaic platform under wind load, and the lift coefficient and drag coefficient dynamically change according to the change in the pitch angle of the photovoltaic platform;

[0037] Step 112: Determine the irradiance received by the platform based on the tilt angle.

[0038] In this embodiment, the method for calculating the irradiance received by an offshore floating photovoltaic platform begins by collecting the geometric parameters of the photovoltaic platform, including its dimensions, shape, and material properties such as density and elastic modulus. Based on this data, a geometric model of the photovoltaic platform is constructed that reflects the actual situation. This model intuitively represents the physical form of the photovoltaic platform. Subsequently, based on the geometric model, a potential flow-boundary element geometric model of the photovoltaic platform is determined through specific mathematical transformations and boundary condition settings. This model effectively accounts for the interaction between fluid and structure, providing powerful support for simulating the impact of waves on the photovoltaic platform. Using simulation software, the potential flow-boundary element geometric model of the photovoltaic platform is used to perform simulations, thereby solving for the velocity potential of the wave field. This velocity potential reflects the energy distribution and flow state of the waves in space and time. Based on the obtained wave field velocity potential, the incident wave force, reflected wave force, and radiated wave force acting on the photovoltaic platform are determined. These three wave forces describe the mechanical effects of waves on the photovoltaic platform from different perspectives and are important parameters for analyzing the platform's motion state. The incident wave force, reflected wave force, and radiated wave force are substituted into the time-domain tilt angle dynamic variation equations. This set of equations is based on the lift and drag coefficients of a photovoltaic platform under wind loads. These lift and drag coefficients are dynamically adjusted based on the real-time changes in the platform's pitch angle. This dynamic variation allows the time-domain tilt angle dynamic variation equations to more realistically and accurately reflect the motion of a photovoltaic platform in a complex marine environment, thereby providing a more precise solution for the time-varying tilt angle of the photovoltaic panels relative to the horizontal plane. By precisely understanding the changes in tilt angle, the accuracy of determining the platform's received irradiance is significantly improved, providing more reliable data support for evaluating the power generation efficiency of offshore photovoltaic platforms and optimizing the layout of photovoltaic modules.

[0039] In one embodiment of the present invention, the velocity potential of the wave field is determined by the following formula:

[0040]

[0041] a w =H / 2

[0042] ω=2π / T

[0043] k=2π / L

[0044] Where a w is the amplitude, i is a complex number, ω is the wave circular frequency, is the velocity potential of the wave field, is the position vector of the photovoltaic platform, g is the acceleration of gravity, t is the time, Z is the coordinate of the photovoltaic platform along the water depth, d is the water depth, k is the wave number, R is the radial radius of the photovoltaic platform, H is the wave height, T is the wave period, and L is the wavelength.

[0045] In this embodiment, those skilled in the art can customize the amplitude, complex number, wave circular frequency, position vector of the photovoltaic platform, gravitational acceleration, time, coordinates of the photovoltaic platform along the water depth direction, water depth, wave number, radial radius of the photovoltaic platform, wave height, wave period and wavelength according to actual usage. The velocity potential of the wave field of the photovoltaic platform at different times can be accurately determined through the above equations.

[0046] In one embodiment of the present invention, the incident wave force, the reflected wave force, and the radiated wave force are determined by the following formula:

[0047]

[0048] Where, F I is the sum of the incident wave force and the hydrostatic pressure, F d is the reflected wave force, F r is the radiation wave force, is the incident velocity potential, is the reflection velocity potential, is the radiation velocity potential, ρ1 is the density of water, z0 is the depth of the photovoltaic platform immersed in water, and S is the surface area of ​​the photovoltaic platform.

[0049] In this embodiment, the boundary element method is used to discretely solve the governing equations of each unit after meshing, thereby obtaining the incident wave force, reflected wave force, and radiated wave force on the structure under the action of waves.

[0050] In one embodiment of the present invention, the time domain tilt angle dynamic change equation group is constructed by the following formula:

[0051]

[0052] F(t)=F I (t)+F d (t)+F e (t)+F t (t)

[0053]

[0054] Where β is the tilt angle, X is the displacement of the photovoltaic platform, and M s is the mass matrix of the photovoltaic platform, C is the fluid dynamic damping matrix, A ∞ is the fluid additional mass matrix, K hys is the hydrostatic stiffness matrix, h(t-τ) is the convolution integral of the wave radiation force, F(t) is the sum of the external forces acting on the photovoltaic platform, and F t (t) is the sum of the mooring force and the connection force between the photovoltaic platform, F e(t) is the wind load force, ρ2 is the air density, A is the area under the wind force, V wind is the wind velocity, C is the wind coefficient which is determined by the lift coefficient and the drag coefficient, θ0 is the initial tilt angle between the photovoltaic panel and the horizontal plane, is the rotational component of the photovoltaic platform displacement in the Z-axis direction, V s is the component of the platform velocity along the X-axis, ω p is the rotational component of the photovoltaic platform velocity along the Y axis, H+h COG It is the height between the center of gravity of the photovoltaic panel and the overall center of gravity of the platform.

[0055] In one embodiment of the present invention, the irradiance received by the platform is determined by the following formula:

[0056] G η =B η +D η +R η

[0057] B η =DNI×r b

[0058] r b =max(0,cosθ / cosθ z )

[0059] cosθ=cosθ z cosβ+sinθ z sinβcos(γ s -γ)

[0060]

[0061] a=max(0,cosθ)

[0062] b=max(cos85°,cosθ z )

[0063]

[0064] Where G η is the irradiance received by the platform, B η For direct irradiation, D η is diffuse irradiance, R η is reflected irradiance, DNI is direct irradiance, DHI is diffuse irradiance, GHI is radiant irradiance, AM is air mass, E a is the extraterrestrial radiation, η is the azimuth angle of the photovoltaic panel, and γ is the direction of the photovoltaic panel towards θ z The solar zenith angle, γ s is the solar azimuth, f 11 , f12 , f 13 , f 21 , f 22 and f 23 They are the first correlation coefficient, the second correlation coefficient, the third correlation coefficient, the fourth correlation coefficient, the fifth correlation coefficient and the sixth correlation coefficient.

[0065] In this embodiment, those skilled in the art can customize the first correlation coefficient, the second correlation coefficient, the third correlation coefficient, the fourth correlation coefficient, the fifth correlation coefficient and the sixth correlation coefficient according to actual usage, and accumulate the irradiance of each time step in a day to obtain the total amount of sunshine received by the offshore floating photovoltaic platform throughout the day.

[0066] In one embodiment of the present invention, the lift coefficient and the drag coefficient are determined by the following steps:

[0067] Construct the geometric model of the photovoltaic panel array and wind farm calculation domain after segmentation;

[0068] Based on the geometric model of the photovoltaic array and wind field calculation domain after segmentation and the photovoltaic panel-wind field coupling control equation, the wind field effect on the photovoltaic array is simulated to determine the velocity distribution and pressure distribution of the wind field;

[0069] Substitute the velocity and pressure distributions into the preset Morrison equation to determine the lift and drag coefficients.

[0070] In this embodiment, based on the geometric model of the photovoltaic panel array and the wind field calculation domain after segmentation, combined with the photovoltaic panel-wind field coupling control equation, a numerical simulation of the interaction between the photovoltaic panel array and the wind field is carried out. During the simulation process, the complex factors such as the flow characteristics of the wind, the blocking and interference effects of the photovoltaic panels, etc. are fully considered. By solving the coupling control equation, the velocity distribution and pressure distribution of the wind field around the photovoltaic panel array are accurately determined. These distribution data intuitively reflect the energy transfer and mechanical action mechanism between the wind field and the photovoltaic panel. The simulated wind field velocity distribution and pressure distribution data are substituted into the preset Morrison equation. The Morrison equation is a classic formula widely used in the field of fluid mechanics. It can effectively describe the relationship between the force acting on an object in a fluid and the fluid characteristics. Through the calculation of this equation, the lift coefficient and drag coefficient of the photovoltaic panel under the action of the wind field are accurately determined.

[0071] In one embodiment of the present invention, the photovoltaic panel-wind farm coupling control equation is as follows:

[0072]

[0073] Where, is the velocity vector, x i , xj , x k are all spatial tensor components, t is time, is the Reynolds mean pressure, ρ is the fluid density, v t is the kinematic viscosity tensor, is the product of the pulsating components of velocity along the i and k directions, is the product of the pulsating components of velocity along the I and J directions, is the product of the pulsating components of velocity along the J direction, σ k is a constant related to the turbulence model, C 1， C2 is an empirical constant, ε is the turbulent kinetic energy dissipation rate, K is the turbulent kinetic energy, P ij is the tensor component related to pressure, δ ij is the Kronecker symbol.

[0074] like Figure 2 、 Figure 3 As shown, an embodiment of the present invention provides a device for calculating the irradiance received by an offshore floating photovoltaic platform. The device embodiment can be implemented by software, hardware, or a combination of software and hardware. From the hardware level, Figure 2 The figure shows a hardware architecture diagram of an electronic device where a calculation device for receiving irradiance of an offshore floating photovoltaic platform is located, provided by an embodiment of the present invention. Figure 2 In addition to the processor, memory, network interface, and non-volatile memory shown, the electronic device in the embodiment may also include other hardware, such as a forwarding chip responsible for processing messages, etc. Taking software implementation as an example, Figure 3 As shown, as a device in a logical sense, it is formed by the CPU of the electronic device in which it is located reading the corresponding computer program in the non-volatile memory into the internal memory and running it.

[0075] like Figure 3 As shown, this embodiment provides a device for calculating the irradiance received by an offshore floating photovoltaic platform, the device comprising:

[0076] An acquisition module 300 is used to obtain geometric parameters and material properties of the photovoltaic platform;

[0077] A first data processing module 302 is configured to determine a geometric model of a photovoltaic platform based on the geometric parameters and the material properties;

[0078] A second data processing module 304 is configured to determine a potential flow-boundary element geometric model of the photovoltaic platform based on the geometric model of the photovoltaic platform;

[0079] The third data processing module 306 is used to perform simulation using the photovoltaic platform potential flow-boundary element geometric model to obtain the velocity potential of the wave field;

[0080] A fourth data processing module 308 is configured to determine incident wave force, reflected wave force, and radiated wave force on the photovoltaic platform based on the velocity potential of the wave field;

[0081] A fifth data processing module 310 is configured to substitute the incident wave force, the reflected wave force, and the radiated wave force into a set of time-domain tilt angle dynamic variation equations to determine the tilt angle of the photovoltaic panels of the photovoltaic platform relative to the horizontal plane over time; wherein the time-domain tilt angle dynamic variation equations are constructed using the lift coefficient and drag coefficient of the photovoltaic platform under wind load, and the lift coefficient and drag coefficient dynamically change according to changes in the pitch angle of the photovoltaic platform;

[0082] The sixth data processing unit 312 is configured to determine the irradiance received by the platform based on the tilt angle.

[0083] In one embodiment of the present invention, the velocity potential of the wave field is determined by the following formula:

[0084]

[0085]

[0086] a w =H / 2

[0087] ω=2π / T

[0088] k=2π / L

[0089] Where a w is the amplitude, i is a complex number, ω is the wave circular frequency, is the velocity potential of the wave field, is the position vector of the photovoltaic platform, g is the acceleration of gravity, t is the time, Z is the coordinate of the photovoltaic platform along the water depth, d is the water depth, k is the wave number, R is the radial radius of the photovoltaic platform, H is the wave height, T is the wave period, and L is the wavelength.

[0090] In one embodiment of the present invention, the incident wave force, the reflected wave force, and the radiated wave force are determined by the following formula:

[0091]

[0092] Where, F I is the sum of the incident wave force and the hydrostatic pressure, F d is the reflected wave force, F r is the radiation wave force, is the incident velocity potential, is the reflection velocity potential, is the radiation velocity potential, ρ1 is the density of water, z0 is the depth of the photovoltaic platform immersed in water, and S is the surface area of ​​the photovoltaic platform.

[0093] In one embodiment of the present invention, the time domain tilt angle dynamic change equation group is constructed by the following formula:

[0094]

[0095] F(t)=F I (t)+F d (t)+F e (t)+F t (t)

[0096]

[0097] Where β is the tilt angle, X is the displacement of the photovoltaic platform, and M s is the mass matrix of the photovoltaic platform, C is the fluid dynamic damping matrix, A ∞ is the fluid additional mass matrix, K hys is the hydrostatic stiffness matrix, h(t-τ) is the convolution integral of the wave radiation force, F(t) is the sum of the external forces acting on the photovoltaic platform, and F t (t) is the sum of the mooring force and the connection force between the photovoltaic platform, F e (t) is the wind load force, ρ2 is the air density, A is the area under the wind force, V wind is the wind velocity, C is the wind coefficient which is determined by the lift coefficient and the drag coefficient, θ0 is the initial tilt angle between the photovoltaic panel and the horizontal plane, is the rotational component of the photovoltaic platform displacement in the Z-axis direction, V s is the component of the platform velocity along the X-axis, ω p is the rotational component of the photovoltaic platform velocity along the Y axis, H+h COG It is the height between the center of gravity of the photovoltaic panel and the overall center of gravity of the platform.

[0098] In one embodiment of the present invention, the platform received irradiance is determined by the following formula:

[0099] G η =B η +D η +R η

[0100] B η =DNI×r b

[0101] r b =max(0,cosθ / cosθ z )

[0102] cosθ=cosθ z cosβ+sinθ z sinβcos(γ s -γ)

[0103]

[0104] a=max(0,cosθ)

[0105] b=max(cos85°,cosθ z )

[0106]

[0107] Where G η is the irradiance received by the platform, B η For direct irradiation, D η is diffuse irradiance, R η is reflected irradiance, DNI is direct irradiance, DHI is diffuse irradiance, GHI is radiant irradiance, AM is air mass, E a is the extraterrestrial radiation, η is the azimuth angle of the photovoltaic panel, and γ is the direction of the photovoltaic panel towards θ z The solar zenith angle, γ s is the solar azimuth, f 11 , f 12 , f 13 , f 21 , f 22 and f 23 They are the first correlation coefficient, the second correlation coefficient, the third correlation coefficient, the fourth correlation coefficient, the fifth correlation coefficient and the sixth correlation coefficient.

[0108] In one embodiment of the present invention, the lift coefficient and the drag coefficient are determined by the following steps:

[0109] Construct the geometric model of the photovoltaic panel array and wind farm calculation domain after segmentation;

[0110] Based on the geometric model of the photovoltaic panel array and wind field calculation domain after the segmentation and the photovoltaic panel-wind field coupling control equation, the photovoltaic panel array is simulated to determine the velocity distribution and pressure distribution of the wind field;

[0111] The velocity distribution and the pressure distribution are substituted into a preset Morrison equation to determine the lift coefficient and the drag coefficient.

[0112] In one embodiment of the present invention, the photovoltaic panel-wind field coupling control equation is as follows:

[0113]

[0114] Where, is the velocity vector, x i , x j , x k are all spatial tensor components, t is time, is the Reynolds mean pressure, ρ is the fluid density, v t is the kinematic viscosity tensor, is the product of the pulsating components of velocity along the i and k directions, is the product of the pulsating components of velocity along the I and J directions, is the product of the pulsating components of velocity along the J direction, σ k is a constant related to the turbulence model, C 1， C2 is an empirical constant, ε is the turbulent kinetic energy dissipation rate, K is the turbulent kinetic energy, P ij is the tensor component related to pressure, δ ij is the Kronecker symbol.

[0115] It should be understood that the structure illustrated in the embodiments of the present invention does not constitute a specific limitation on the device for calculating and measuring the irradiance received by an offshore floating photovoltaic platform. In other embodiments of the present invention, the device for calculating and measuring the irradiance received by an offshore floating photovoltaic platform may include more or fewer components than illustrated, or may combine or separate certain components, or employ a different component arrangement. The illustrated components may be implemented in hardware, software, or a combination of both.

[0116] The information interaction, execution process, etc. between the modules in the above-mentioned device are based on the same concept as the embodiment of the method of the present invention. For specific contents, please refer to the description in the embodiment of the method of the present invention and will not be repeated here.

[0117] An embodiment of the present invention further provides an electronic device comprising a memory and a processor, wherein the memory stores a computer program, and when the processor executes the computer program, a method for calculating the irradiance received by an offshore floating photovoltaic platform according to any embodiment of the present invention is implemented.

[0118] An embodiment of the present invention further provides a computer-readable storage medium having a computer program stored thereon. When the computer program is executed by a processor, the processor executes a method for calculating the irradiance received by an offshore floating photovoltaic platform according to any embodiment of the present invention.

[0119] Specifically, a system or device equipped with a storage medium can be provided, on which software program codes that implement the functions of any of the above-mentioned embodiments are stored, and a computer (or CPU or MPU) of the system or device can be enabled to read and execute the program codes stored in the storage medium.

[0120] In this case, the program code itself read from the storage medium can realize the function of any one of the above-mentioned embodiments, and thus the program code and the storage medium storing the program code constitute part of the present invention.

[0121] Examples of storage media for providing program code include floppy disks, hard disks, magneto-optical disks, optical disks (such as CD-ROM, CD-R, CD-RW, DVD-ROM, DVD-RAM, DVD-RW, DVD+RW), magnetic tapes, non-volatile memory cards, and ROMs. Alternatively, the program code can be downloaded from a server computer via a communication network.

[0122] In addition, it should be clear that the functions of any of the above embodiments can be achieved not only by executing the program code read by the computer, but also by enabling the operating system operating on the computer to complete part or all of the actual operations based on the instructions of the program code.

[0123] In addition, it can be understood that the program code read from the storage medium is written into the memory provided in the expansion board inserted into the computer or into the memory provided in the expansion module connected to the computer, and then based on the instructions of the program code, the CPU installed on the expansion board or expansion module is enabled to perform part or all of the actual operations, thereby realizing the functions of any of the above embodiments.

[0124] It should be noted that, in this document, relational terms such as first and second are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0125] Those skilled in the art will understand that all or part of the steps of implementing the above-mentioned method embodiment can be completed by hardware related to program instructions, and the aforementioned program can be stored in a computer-readable storage medium. When the program is executed, it executes the steps of the above-mentioned method embodiment; and the aforementioned storage medium includes: ROM, RAM, disk or optical disk, etc. Various media that can store program codes.

[0126] 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 it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A method for calculating the irradiance received by an offshore floating photovoltaic platform, characterized in that: The method comprises: Obtain the geometric parameters and material properties of the photovoltaic platform; determining a geometric model of the photovoltaic platform based on the geometric parameters and the material properties; Determining a potential flow-boundary element geometric model of the photovoltaic platform based on the geometric model of the photovoltaic platform; The photovoltaic platform potential flow-boundary element geometric model is used to perform simulation to obtain the velocity potential of the wave field; determining incident wave force, reflected wave force, and radiated wave force on the photovoltaic platform based on the velocity potential of the wave field; Substituting the incident wave force, the reflected wave force, and the radiated wave force into a time-domain tilt angle dynamic variation equation group to determine the tilt angle of the photovoltaic panels of the photovoltaic platform relative to the horizontal plane as it changes over time; wherein the time-domain tilt angle dynamic variation equation group is constructed using the lift coefficient and drag coefficient of the photovoltaic platform under wind load, and the lift coefficient and the drag coefficient dynamically change according to changes in the pitch angle of the photovoltaic platform; determining the irradiance received by the platform based on the tilt angle; The velocity potential of the wave field is determined by the following formula: a w =H / 2 ω=2π / T k=2π / L Where a w is the amplitude, i is a complex number, ω is the wave circular frequency, is the velocity potential of the wave field, is the position vector of the photovoltaic platform, g is the acceleration of gravity, t is the time, Z is the coordinate of the photovoltaic platform along the water depth direction, d is the water depth, k is the wave number, R is the radial radius of the photovoltaic platform, H is the wave height, T is the wave period, and L is the wavelength; The incident wave force, the reflected wave force and the radiated wave force are determined by the following formula: Where, F I is the sum of the incident wave force and the hydrostatic pressure, F d is the reflected wave force, F r is the radiation wave force, is the incident velocity potential, is the reflection velocity potential, is the radiation velocity potential, ρ1 is the density of water, z0 is the depth of the photovoltaic platform immersed in water, and S is the surface area of ​​the photovoltaic platform; The time domain tilt angle dynamic change equation group is constructed by the following formula: F(t)=F I (t)+F d (t)+F e (t)+F t (t) Where β is the tilt angle, X is the displacement of the photovoltaic platform, and M s is the mass matrix of the photovoltaic platform, C is the fluid dynamic damping matrix, A ∞ is the fluid additional mass matrix, K hys is the hydrostatic stiffness matrix, h(t-τ) is the convolution integral of the wave radiation force, F(t) is the sum of the external forces acting on the photovoltaic platform, and F t (t) is the sum of the mooring force and the connection force between the photovoltaic platform, F e (t) is the wind load force, ρ2 is the air density, A is the area under the wind force, V wind is the wind velocity, C is the wind coefficient which is determined by the lift coefficient and the drag coefficient, θ0 is the initial tilt angle between the photovoltaic panel and the horizontal plane, is the rotational component of the photovoltaic platform displacement in the Z-axis direction, V s is the component of the platform velocity along the X-axis, ω p is the rotational component of the photovoltaic platform velocity along the Y axis, H+h COG It is the height between the center of gravity of the photovoltaic panel and the overall center of gravity of the platform.

2. The method according to claim 1, characterized in that The platform received irradiance is determined by the following formula: G η =B η +D η +R η B η =DNI×r b r b =max(0,cosθ / cosθ z ) cosθ=cosθ z cosβ+sinθ z sinβcos(γ s -c) a=max(0,cosθ) b=max(cos85°,cosθ z ) Where G η is the irradiance received by the platform, B η For direct irradiation, D η is diffuse irradiance, R η is reflected irradiance, DNI is direct irradiance, DHI is diffuse irradiance, GHI is radiant irradiance, AM is air mass, E a is the extraterrestrial radiation, η is the azimuth angle of the photovoltaic panel, and γ is the direction of the photovoltaic panel towards θ z The solar zenith angle, γ s is the solar azimuth, f 11 , f 12 , f 13 , f 21 , f 22 and f 23 They are the first correlation coefficient, the second correlation coefficient, the third correlation coefficient, the fourth correlation coefficient, the fifth correlation coefficient and the sixth correlation coefficient.

3. The method according to claim 1, characterized in that The lift coefficient and the drag coefficient are determined by the following steps: Construct the geometric model of the photovoltaic panel array and wind farm calculation domain after segmentation; Based on the geometric model of the photovoltaic panel array and wind field calculation domain after the segmentation and the photovoltaic panel-wind field coupling control equation, the photovoltaic panel array is simulated to determine the velocity distribution and pressure distribution of the wind field; The velocity distribution and the pressure distribution are substituted into a preset Morrison equation to determine the lift coefficient and the drag coefficient.

4. The method according to claim 3, characterized in that The photovoltaic panel-wind field coupling control equation is as follows: Where, is the velocity vector, x i , x j , x k are all spatial tensor components, t is time, is the Reynolds mean pressure, ρ is the fluid density, v t is the kinematic viscosity tensor, is the product of the pulsating components of velocity along the i and k directions, is the product of the pulsating components of velocity along the I and J directions, is the product of the pulsating components of velocity along the J direction, σ k is a constant related to the turbulence model, C 1， C2 is an empirical constant, ε is the turbulent kinetic energy dissipation rate, K is the turbulent kinetic energy, P ij is the tensor component related to pressure, δ ij is the Kronecker symbol.

5. A device for calculating irradiance received by an offshore floating photovoltaic platform, characterized in that: The method according to any one of claims 1 to 4, comprising: An acquisition module is used to obtain the geometric parameters and material properties of the photovoltaic platform; a first data processing module, configured to determine a geometric model of the photovoltaic platform based on the geometric parameters and the material properties; A second data processing module is used to determine a potential flow-boundary element geometric model of the photovoltaic platform based on the geometric model of the photovoltaic platform; A third data processing module is used to perform simulation using the photovoltaic platform potential flow-boundary element geometric model to obtain the velocity potential of the wave field; a fourth data processing module, configured to determine incident wave force, reflected wave force, and radiated wave force exerted on the photovoltaic platform based on the velocity potential of the wave field; a fifth data processing module, configured to substitute the incident wave force, the reflected wave force, and the radiated wave force into a set of time-domain tilt angle dynamic variation equations to determine the tilt angle of the photovoltaic panels of the photovoltaic platform relative to the horizontal plane as it changes over time; wherein the time-domain tilt angle dynamic variation equations are constructed using the lift coefficient and drag coefficient of the photovoltaic platform under wind load, and the lift coefficient and the drag coefficient dynamically change according to changes in the pitch angle of the photovoltaic platform; The sixth data processing unit is configured to determine the irradiance received by the platform based on the tilt angle.

6. An electronic device, characterized in that: The method comprises a memory and a processor, wherein the memory stores a computer program, and when the processor executes the computer program, the method according to any one of claims 1 to 4 is implemented.

7. A computer-readable storage medium, characterized in that A computer program is stored thereon, and when the computer program is executed in a computer, the computer is caused to execute the method according to any one of claims 1 to 4.

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