Offshore photovoltaic pile foundation structure and offshore photovoltaic power generation system

Abstract

The utility model provides an offshore photovoltaic pile foundation structure and an offshore photovoltaic power generation system, and relates to the field of offshore photovoltaic technologies. The structure comprises a first pile foundation assembly and a second pile foundation assembly. The first pile foundation assembly comprises at least two first pile foundations of a steel structure, the axis of each first pile foundation is perpendicular to the sea level, the first pile foundation assembly is used for fixing the net rack, and a plurality of photovoltaic panels are arranged on the net rack; the second pile foundation assembly comprises at least two second pile foundations of concrete structures, the axes of the second pile foundations are perpendicular to the sea level, the elevations of the second pile foundations are the same, the second pile foundation assembly and the first pile foundation assembly are arranged adjacently, and the second pile foundation assembly is used for fixing the box transformer substation platform. Projections of the box transformer substation platform and the net rack on the sea level are at least partially overlapped, the box transformer substation is arranged on the box transformer substation platform, and the plurality of photovoltaic panels are connected with the box transformer substation; the elevation of the first pile foundation is larger than that of the second pile foundation. The structure can meet the installation requirements of the grid and the box transformer substation at the same time, the installation stability is improved, and the structure compactness is high.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to the field of offshore photovoltaic technology, in particular to an offshore photovoltaic pile foundation structure and an offshore photovoltaic power generation system. BACKGROUND

[0002] A photovoltaic system is a power generation system that directly converts solar radiation energy into electrical energy by using the photovoltaic effect of photovoltaic cells. Generally, the photovoltaic system includes a transformer, an inverter, a photovoltaic array, and related auxiliary facilities. The photovoltaic array and the auxiliary facilities are connected by multiple devices to deliver the electrical energy converted from solar energy to a user end. Commonly used photovoltaic systems are mostly arranged on land. However, due to the limited space on land and the influence of buildings or plants, the arrangement space of the photovoltaic system is limited. Considering the absorption rate and utilization rate of solar energy, the sea surface becomes a better choice for the photovoltaic system.

[0003] At present, a tubular pile is often used to support a photovoltaic net rack in a land photovoltaic system. Other devices such as a transformer can be directly arranged on the ground without the need for a support structure. However, for a photovoltaic system arranged in a marine environment, all devices need to be arranged on the sea surface. Therefore, the traditional land support structure cannot meet the laying requirements of the marine environment. In addition, due to the different structures and laying requirements of the devices in the photovoltaic system, the traditional support structure and the layout of the devices cannot simultaneously consider the support stability and economy, and the compactness of the structure is poor.

[0004] It should be noted that the information disclosed in the above background section is only used to strengthen the understanding of the background of the present disclosure, and therefore can include information that does not constitute prior art known to those of ordinary skill in the art. SUMMARY

[0005] Therefore, an offshore photovoltaic pile foundation structure is provided. The first pile foundation assembly of the steel structure supports the net rack, and the second pile foundation assembly of the concrete structure supports the transformer platform. The projection of the transformer platform and the net rack on the sea surface at least partially overlaps, and the elevation of the first pile foundation is greater than the elevation of the second pile foundation. The support stability and economy of the pile foundation assembly for different components can be simultaneously considered, and the compactness of the system structure is improved.

[0006] Other characteristics and advantages of the present disclosure will become apparent from the following detailed description, or will be learned by practice of the present disclosure.

[0007] According to one aspect of the present disclosure, an offshore photovoltaic pile foundation structure is provided. The pile foundation structure comprises: a first pile foundation assembly comprising at least two first pile foundations, each of the first pile foundations being a steel structure, and the axis of each of the first pile foundations being perpendicular to the sea level, the first pile foundation assembly being used to fix a net rack, and a plurality of photovoltaic panels being arranged on the net rack.

[0008] a second pile foundation assembly comprising at least two second piles, each of the second piles being a concrete structure, an axis of each of the second piles being perpendicular to the sea level, and an elevation of each of the second piles being the same, the second pile foundation assembly being adjacently arranged with the first pile foundation assembly, the second pile foundation assembly being used for fixing a box transformer platform, a projection of the box transformer platform on the sea level at least partially overlapping with the net rack, a box transformer being arranged on the box transformer platform, and a plurality of the photovoltaic panels being connected with the box transformer;

[0009] wherein the elevation of the first pile foundation is greater than the elevation of the second pile foundation.

[0010] In an exemplary embodiment of the present disclosure, a height difference between each of the first piles arranged close to the second pile foundation assembly and the second piles is greater than or equal to a preset height, the preset height being a sum of a thickness of the box transformer platform and a height of the box transformer.

[0011] In an exemplary embodiment of the present disclosure, the net rack has a preset included angle with the sea level, and along a direction in which the preset included angle is increased, the heights of the first piles are sequentially increased.

[0012] In an exemplary embodiment of the present disclosure, along the direction in which the preset included angle is increased, the pile diameters of the first piles are sequentially decreased.

[0013] In an exemplary embodiment of the present disclosure, the preset included angle is 10°-20°.

[0014] In an exemplary embodiment of the present disclosure, the weight of the first pile foundation is not greater than the weight of the second pile foundation.

[0015] In an exemplary embodiment of the present disclosure, a number of the first piles in the first pile foundation assembly is not less than a number of the second piles in the second pile foundation assembly.

[0016] In an exemplary embodiment of the present disclosure, each of the first piles is a hollow structure.

[0017] In an exemplary embodiment of the present disclosure, each of the second piles is a PHC pipe structure.

[0018] According to another aspect of the present disclosure, there is provided an offshore photovoltaic power generation system arranged in a plurality of sea areas, the system comprising: a plurality of photovoltaic arrays, each of the photovoltaic arrays comprising a plurality of the above-mentioned offshore photovoltaic pile structures arranged in an array, the photovoltaic arrays being used for converting solar energy into electric energy; and each of the photovoltaic arrays being arranged on one of the sea areas.

[0019] The offshore photovoltaic pile foundation structure provided by the present disclosure comprises a first pile foundation assembly and a second pile foundation assembly, the first pile foundation assembly is used for fixing a net rack, and the second pile foundation assembly is used for fixing a box transformer platform, wherein the elevation of a first pile arranged in the first pile foundation assembly is greater than the elevation of a second pile in the second pile foundation assembly, and the projection of the box transformer platform and the net rack on the sea level at least partially overlaps, so that the compactness of the layout of the net rack and the box transformer platform is improved, and the utilization rate of the sea area is improved. In addition, the first pile adopts a steel structure, and the second pile adopts a concrete structure. Different structures are fixed and supported by using pile foundation assemblies with different elevations and different structures, so that the support stability and installation requirements of different components are met, and the economy is improved.

[0020] The offshore photovoltaic power generation system provided by the present disclosure comprises the pile foundation structure, has high structural compactness and structural stability, and has high practicability.

[0021] It should be understood that the above general description and the following detailed description are only exemplary and explanatory, and cannot limit the present disclosure. BRIEF DESCRIPTION OF DRAWINGS

[0022] The drawings herein are incorporated into the specification and form part of the specification, show embodiments consistent with the present disclosure, and together with the specification serve to explain the principles of the present disclosure. Obviously, the drawings in the following description are only some embodiments of the present disclosure, and other drawings can be obtained from these drawings without creative labor for those skilled in the art.

[0023] Figure 1 It is a side view structural schematic diagram of an offshore photovoltaic pile foundation structure in an exemplary embodiment of the present disclosure.

[0024] Figure 2 It is a three-dimensional structural schematic diagram of an offshore photovoltaic pile foundation structure in an exemplary embodiment of the present disclosure.

[0025] Figure 3 It is a structural schematic diagram of a first pile foundation assembly in an exemplary embodiment of the present disclosure.

[0026] Figure 4 It is a partial structural schematic diagram of a first pile in an exemplary embodiment of the present disclosure.

[0027] In the drawings, the reference signs are explained as follows:

[0028] 10, first pile foundation assembly; 11, first pile; 20, second pile foundation assembly; 21, second pile; 30, net rack; 40, box transformer platform; 50, box transformer; 60, photovoltaic panel; L, preset height; α, preset included angle. DETAILED DESCRIPTION

[0029] Example implementations will now be described more fully with reference to the accompanying drawings. Example implementations can be implemented in any numerous ways, and example implementations should not be construed as limited to having been set forth in the description herein; rather, descriptions are provided so that this disclosure will be complete and fully convey the concept of example implementations to those skilled in the art. Identical reference numerals can have been used, where appropriate, to designate identical or similar components that are found in one or more of the same or analogous illustrations. Further, the drawings are merely schematic and viewed from different perspectives for ease of discussion and full comprehension of the example implementations.

[0030] Although relative terms such as "upper", "lower", etc. are used herein to describe one component's relationship to another component of the icon, these terms are used herein for ease of description only and are not intended to limit the scope of the disclosure or to require a particular orientation of the icon. It will be understood that if the icon is turned over, the component described as "upper" will then become the "lower" component. When a structure is "on" another structure, it can mean that the structure is formed integrally with the other structure or that the structure is "directly" on the other structure or that the structure is "indirectly" on the other structure via another structure.

[0031] The terms "a", "an", "the", "said", and "at least one" are used to refer to one or more elements / components / etc.; the terms "comprise(s)", "comprising", "having" and "include(s)" are used to mean that other elements / components / etc. can be included in addition to the listed elements / components / etc.; the terms "first", "second", and "third", etc. are used only as labels, and do not imply any limitation on the number of elements.

[0032] In the related art, a pile foundation is a deep foundation composed of piles and pile caps connected to the top of the piles or a single pile foundation connected to a pile foundation by a column, simply referred to as a pile foundation. Offshore construction often uses a large number of pile foundation structures, which are fixed to the sea to serve as the basis for subsequent fixed construction.

[0033] An offshore photovoltaic system generally includes photovoltaic components, box transformers, and inverters, etc. The photovoltaic components are laid on a net rack, and the net rack and the box transformer need to be reliably fixed on the pile foundation structure to realize stable operation of the photovoltaic system on the sea. However, the requirements of the net rack and the box transformer on the pile foundation are different, and the same pile foundation structure cannot be used for the support stability requirements of the offshore net rack and the box transformer at the same time, and the economy is poor. At the same time, the compactness of the traditional offshore pile foundation structure is poor, and a large sea area is occupied.

[0034] In the present disclosure, the box transformer can refer to a box transformer station, which is a device for converting direct current generated by a solar photovoltaic module into alternating current and sending it into a power grid. The box transformer can be composed of a direct current bus, an alternating current bus, a transformer, etc. As an important component in a solar photovoltaic system, the box transformer can better convert the electrical energy generated by the photovoltaic module into usable electrical energy. The elevation of the pile foundation can refer to the vertical distance between the top of the pile foundation and the sea level. The pile diameter refers to the outer diameter dimension of the pile foundation in a tubular structure or a tubular-like structure.

[0035] Based on this, the present disclosure provides an offshore photovoltaic pile foundation structure, as shown in Figure 1 and Figure 2 The pile foundation structure includes a first pile foundation assembly 10 and a second pile foundation assembly 20.

[0036] The first pile foundation assembly 10 includes at least two first pile foundations 11, each first pile foundation 11 adopts a steel structure, the axis of each first pile foundation 11 is perpendicular to the sea level, and the first pile foundation assembly 10 is used to fix a net rack 30, the net rack 30 is provided with a plurality of photovoltaic panels 60; the second pile foundation assembly 20 includes at least two second pile foundations 21, each second pile foundation 21 adopts a concrete structure, the axis of each second pile foundation 21 is perpendicular to the sea level, and the elevations of each second pile foundation 21 are the same, the second pile foundation assembly 20 is adjacent to the first pile foundation assembly 10, the second pile foundation assembly 20 is used to fix a box transformer platform 40, the projection of the box transformer platform 40 and the net rack 30 on the sea level at least partially overlaps, the box transformer platform 40 is provided with a box transformer 50, and the plurality of photovoltaic panels 60 are connected with the box transformer 50; wherein the elevation of the first pile foundation 11 is greater than the elevation of the second pile foundation 21.

[0037] The offshore pile foundation structure provided by the present disclosure includes a first pile foundation assembly 10 and a second pile foundation assembly 20, the first pile foundation assembly 10 is used to fix a net rack 30, and the second pile foundation assembly 20 is used to fix a box transformer platform 40. The first pile foundation assembly 10 includes at least two first pile foundations 11 with a steel structure, the second pile foundation assembly 20 includes at least two second pile foundations 21 with a concrete structure, the elevation of the first pile foundation 11 is greater than the elevation of the second pile foundation 21, and the projection of the box transformer platform 40 and the net rack 30 on the sea level at least partially overlaps. This can improve the compactness of the layout of the net rack 30 and the box transformer platform 40, and improve the utilization rate of the sea area. In addition, the first pile foundation 11 adopts a steel structure, and the second pile foundation 21 adopts a concrete structure. Different pile foundation assemblies with different elevations and different structures are used to fix and support different structures, which can meet the support stability and installation requirements of different components, and improve the economy.

[0038] The various parts of the offshore photovoltaic pile foundation structure provided by the present disclosure will be described in detail below in combination with the drawings:

[0039] In the embodiments provided in the present disclosure, as shown in Figure 1 Figure 2 The pile foundation structure comprises a first pile foundation assembly 10 for fixing a net rack 30, and the net rack 30 is provided with a plurality of photovoltaic panels 60.

[0040] The net rack 30 can be composed of a plurality of single-bay trusses, a plurality of web members and a plurality of diagonal members, and the shape of the net rack 30 can be a cuboid or a cuboid-like shape. The net rack 30 is arranged on the sea level and provides support for the laying of the photovoltaic panels 60. Specifically, the side of the net rack 30 away from the sea level is a support surface for providing support force for the photovoltaic panels 60, and the side of the net rack 30 close to the sea level is a connecting surface for connecting the first pile foundation assembly 10. In the present disclosure, since a plurality of photovoltaic assemblies can be laid on the sea surface area, each photovoltaic assembly needs to be supported by the net rack 30. Therefore, the net rack 30 can refer to a collection of a plurality of net rack 30 units, or refer to a single net rack 30 unit, and a single net rack 30 unit is used to support a single photovoltaic subarray unit. In the following embodiments of the present disclosure, the net rack 30 refers to a single net rack 30 unit, but when the net rack 30 refers to a collection of net racks 30, the pile foundation structure of the collection of net racks 30 can be set according to the pile foundation structure of a single net rack 30 unit. The first pile foundation assembly 10 is used to support and fix the net rack 30, and provides a structural basis for laying the photovoltaic panels 60 on the net rack 30.

[0041] The first pile foundation assembly 10 comprises at least two first pile foundations 11, and the axis of each first pile foundation 11 is perpendicular to the sea level. One end of each first pile foundation 11 is sunk or inserted into the sea and fixed on the seabed by piling or other methods, and the other end of each first pile foundation 11 is connected to the side of the net rack 30 close to the sea level. The first pile foundation assembly 10 and the net rack 30 can be connected by riveting, hinging, welding or bonding.

[0042] In order to ensure the uniformity of the support of the first pile foundation 11 to the net rack 30, improve the stability of the support of the first pile foundation assembly 10 to the net rack 30, and avoid deformation of some first pile foundations 11 during use due to uneven stress, it is necessary to ensure the perpendicularity of each first pile foundation 11. Therefore, the angle between the axis of each first pile foundation 11 and the sea level should be 90°. However, due to errors in the piling process, the angle between the axis of each first pile foundation 11 and the sea level may not be exactly 90°. It should be understood that the angle between the axis of each first pile foundation 11 and the sea level is within the range of 80° to 90°, and it is considered that the axis of each first pile foundation 11 is perpendicular to the sea level.

[0043] As shown in Figure 1 and Figure 2 ​As shown, the lengths of the first piles 11 can be the same or different. When the lengths of the first piles 11 are the same and their depths in the mud are also the same, the grid structure 30 is set parallel or approximately parallel to the sea level. When the lengths of the first piles 11 are different but their depths in the mud are the same, or when the lengths of the first piles 11 are the same but their depths in the mud are different, the grid structure 30 has a preset angle α with the sea level. Furthermore, since the position of the solar rays relative to the photovoltaic panels 60 changes over time, and the photovoltaic panels 60 are installed on the grid structure 30, in order to improve the absorption and utilization rate of solar energy by the photovoltaic panels 60, the grid structure 30 needs to have a preset angle with the sea level. Therefore, the preset angle α between the grid structure 30 and the sea level can be achieved by adjusting the lengths and depths of the first piles 11.

[0044] It should be noted that the embedment depth refers to the length of one end of the pile foundation inserted into or sunk into the mud for fixing the pile foundation perpendicular to the sea level at sea. In the embodiments provided in this disclosure, the embedment depth can be understood as a portion of the pile foundation's length, i.e., the total length of a single pile foundation includes the embedment depth. The embedment depth can refer to the vertical distance of the portion of the pile foundation inserted into the seabed mud.

[0045] like Figure 1 As shown, to ensure the utilization rate of solar energy by the photovoltaic panel 60, the preset angle α between the grid frame 30 and the sea level can be 10° to 20°, for example, it can be 10°, 11°, 12°, 13°, 14°, 15°, 16°, 17°, 18°, 19°, or 20°. Furthermore, to simultaneously ensure the supporting strength and stability of the grid frame 30 for the photovoltaic panel 60, the angle between the grid frame 30 and the sea level can be 15°.

[0046] To ensure the angle between the net rack 30 and the sea level is the preset angle a, the height of each first pile 11 increases in the direction of the opening of the preset angle a. In some embodiments, the first pile assembly 10 can include a first pile 11 row and a second pile 21 row in the direction of the opening of the preset angle a, and each of the first pile 11 row and the second pile 21 row includes two first piles 11, wherein the length and elevation of each first pile 11 in the first pile 11 row can be the same, the length and elevation of each first pile 11 in the second pile 21 row can be the same, but the elevation of the second pile 21 row is greater than that of the first pile 11 row, and after the net rack 30 is fixed on the first pile assembly 10, the net rack 30 is inclined to the sea level. Of course, the above embodiment is only exemplary, and the number and arrangement of the pile rows in the first pile assembly 10 can be adaptively set and adjusted according to different preset angles, such as three rows, four rows or even more, which can ensure the stability of the support of the first pile assembly 10 to the net rack 30 while meeting the preset angle a between the net rack 30 and the sea level.

[0047] Further, in order to improve the economy of the first pile assembly 10, different pile diameters are used for each pile in the first pile assembly 10. As shown in Figure 3 in the direction of the opening of the preset angle a, the pile diameter of each first pile 11 decreases in turn. In the support of the first pile assembly 10 to the net rack 30, the first pile 11 with smaller elevation bears larger load, and the first pile 11 with larger elevation bears smaller load. In order to balance the economy and support stability of the first pile 11, the first pile 11 with smaller elevation can use a pile with larger diameter, and the first pile 11 with larger elevation can use a pile with smaller diameter, and in the embodiment shown in Figure 3 , the pile diameter of the first pile 11 with smaller elevation is D1, the pile diameter of the first pile 11 with larger elevation is D3, and the pile diameter of the first pile 11 with intermediate elevation is D2, wherein D1≥D2≥D3.

[0048] In some embodiments, each first pile 11 can be independently arranged, that is, each first pile 11 is independently supported by the net rack 30, and during subsequent maintenance, the individual first pile 11 can be repaired or replaced, facilitating maintenance; each first pile 11 or part of the first piles 11 can be connected to each other, which can improve the stress uniformity of the first pile assembly 10 and prolong the service life of the first pile assembly 10.

[0049] In some embodiments, each first pile 11 can be made of steel structure, which has high strength, corrosion resistance and long service life, and is suitable for stable support of large structures such as the net rack 30. In addition, in order to improve the economy, the installation stability and the convenience of the installation process, such asFigure 4 As shown, each first pile foundation 11 can also adopt a hollow structure.

[0050] The pile diameter of each first pile foundation 11 can be 800mm-1400mm, and different pile diameters can be selected according to different loads borne by the first pile foundation 11. For example, when the load borne by the first pile foundation 11 is large, a pile foundation with a pile diameter in the range of 1000mm-14000mm can be selected; when the load borne by the first pile foundation 11 is small, a pile foundation with a pile diameter in the range of 800mm-10000mm can be selected. The division of the load borne by the first pile foundation 11 can be determined according to actual structural design requirements, and the load size limit is not unique and can be adaptively changed according to specific environmental or use requirements. In addition, the division limit of the pile diameter is also not unique and can be adjusted according to actual requirements.

[0051] The wall thickness of each first pile foundation 11 can be 15mm-20mm, and similar to the determination method of the pile diameter range of the first pile foundation 11, when the load borne by the first pile foundation 11 is large, a pile foundation with a wall thickness in the range of 18mm-20mm can be selected; when the load borne by the first pile foundation 11 is small, a pile foundation with a wall thickness in the range of 15mm-18mm can be selected.

[0052] The length of each first pile foundation 11 can be 25m-35m, and the mud penetration depth can be 9m-12m. For the first pile foundation 11 arranged in different sea areas or at different positions of the net rack 30, the length and mud penetration depth can be adjusted within the above range to ensure that the net rack 30 has a predetermined angle with the sea level, thereby ensuring that the photovoltaic panels 60 on the net rack 30 can fully utilize the offshore solar energy resources.

[0053] Each first pile foundation 11 in the first pile foundation assembly 10 of the present disclosure adopts the above range of sizes, which can not only ensure that each pile foundation can bear the offshore load, but also save the manufacturing cost of each pile foundation, and balance the support stability and economy of the first pile foundation assembly 10.

[0054] In the embodiments provided by the present disclosure, the pile foundation structure includes a second pile foundation assembly 20, which is used to fix a box transformer platform 40. The box transformer platform 40 is provided with a box transformer 50, and the box transformer 50 is connected with a plurality of photovoltaic panels 60. The box transformer 50 can be used to step up the electrical energy collected by the plurality of photovoltaic panels 60.

[0055] The box transformer platform 40 can be made of concrete, providing a structural basis for the subsequent installation of the box transformer 50. The box transformer platform 40 can be flat or flat-like, having a relatively flat installation surface to ensure the stability of the installation of the box transformer 50 on the box transformer platform 40. Specifically, the side of the box transformer platform 40 away from the sea level can be used to provide an installation surface for the box transformer 50, and the side close to the sea level can be used to connect the second pile foundation assembly 20.

[0056] The second pile foundation assembly 20 includes at least two second pile foundations 21, and the axis of each second pile foundation 21 is perpendicular to the sea level. One end of each second pile foundation 21 is sunk or inserted into the sea and fixed to the seabed by piling or other methods, and the other end of each second pile foundation 21 is connected to the side of the box transformer platform 40 close to the sea level. The second pile foundation assembly 20 and the box transformer platform 40 are connected by riveting, hinging, welding, or bonding, or the second pile foundation assembly 20 can be integrally formed with the box transformer platform 40.

[0057] To ensure the uniformity of the support of the second pile foundations 21 to the box transformer platform 40, improve the stability of the support of the second pile foundation assembly 20 to the box transformer platform 40, and avoid deformation of some second pile foundations 21 during use due to uneven stress, the perpendicularity of each second pile foundation 21 needs to be ensured. Therefore, the angle between the axis of each second pile foundation 21 and the sea level should be 90°. However, due to errors in the piling process, the angle between the axis of each second pile foundation 21 and the sea level may not be exactly 90°. It should be understood that the angle between the axis of each second pile foundation 21 and the sea level is within the range of 80° to 90°, and each second pile foundation 21 is considered to be perpendicular to the sea level.

[0058] Since the installation and fixation of the box transformer platform 40 need to ensure the levelness, the elevations of the second pile foundations 21 are the same. The lengths of the second pile foundations 21 can be the same or different. To ensure that the installation surface of the box transformer platform 40 is parallel or approximately parallel to the sea level, the lengths of the second pile foundations 21 are the same and the penetration depths are the same, or the lengths of the second pile foundations 21 are different and the penetration depths are different. Further, to improve construction efficiency, the same length and penetration depth of the second pile foundations 21 can be selected, which can realize batch production of the second pile foundations 21, save piling times, and improve economic efficiency.

[0059] The length of each first pile foundation 11 can be 20m to 30m, and the penetration depth can be 7m to 9m. For the second pile foundation assembly 20 arranged in different sea areas, the lengths and penetration depths of the second pile foundations 21 in the second pile foundation assembly 20 can be adjusted within the above ranges to ensure that the box transformer platform 40 and the sea level are parallel to each other.

[0060] The number of the second pile foundations 21 in the second pile foundation assembly 20 can be four, and the four second pile foundations 21 are uniformly connected to one side of the box transformer platform 40 close to the sea level. Specifically, the distances between each second pile foundation 21 and the center of the box transformer platform 40 can be the same, so as to ensure the uniformity of the stress of each second pile foundation 21 and the parallelism of the box transformer platform 40.

[0061] In some embodiments, each second pile foundation 21 can be independently arranged, that is, each second pile foundation 21 independently supports the box transformer platform 40. In subsequent maintenance, the individual second pile foundation 21 can be repaired or replaced, which is convenient for maintenance. Alternatively, the second pile foundations 21 or part of the second pile foundations 21 can be connected to each other, so as to improve the uniformity of the stress of the second pile foundation assembly 20 and the service life of the second pile foundation assembly 20.

[0062] In some embodiments, each second pile foundation 21 can adopt a concrete structure. The concrete structure has the characteristics of strong bearing capacity, convenient construction, economy and practicality, and is suitable for stable support of the planar structure such as the box transformer platform 40. In addition, in order to improve the economy, installation stability and the convenience of the installation process, each second pile foundation 21 can also adopt a hollow structure. In some specific embodiments, the second pile foundation 21 can adopt a PHC (prestressed high-intensity concrete) pipe structure. The PHC pipe can be made by the process of pre-tensioning and adding fine materials and high-efficiency water reducing agents, and is a kind of slender hollow precast concrete member with equal cross section, which is formed by centrifugal dewatering and dense molding of concrete and steam curing under normal pressure and high pressure twice.

[0063] Since the stress of each second pile foundation 21 is relatively uniform, the pile diameters of the second pile foundations 21 can be the same or substantially the same. The size of the pile diameter can be selected according to the actual sea environment factors and the structure design requirements.

[0064] In the embodiments provided in the present disclosure, in order to improve the compactness of the layout of the pile foundation assembly and improve the utilization rate of the sea area, the second pile foundation assembly 20 is arranged adjacent to the first pile foundation assembly 10 in the pile foundation structure, and the elevation of the first pile foundation 11 is greater than the elevation of the second pile foundation 21. The projections of the box transformer platform 40 and the net rack 30 on the sea level at least partially overlap.

[0065] Since the net rack 30 and the sea level have a preset angle α, the net rack 30 and the sea level have a preset space therebetween. The space has an accommodation space. In order to improve the utilization rate of the sea space, the box transformer 50 can be arranged in the space. By arranging part or all of the box transformer platform 40 in the preset space, the sea area occupied by the box transformer 50 can be reduced.

[0066] In order to ensure that the transformer substation 50 can be installed in the preset space, under the premise that the elevation of each first pile foundation 11 is greater than the elevation of each second pile foundation 21, the height difference between each first pile foundation 11 and the second pile foundation 21 located near the second pile foundation assembly 20 is greater than or equal to the preset height L, where the preset height L is the sum of the thickness of the transformer substation platform 40 and the height of the transformer substation 50.

[0067] The weight of each first pile foundation 11 shall not exceed the weight of the second pile foundation 21, so as to ensure that different weights can be used when transporting and installing the first pile foundation assembly 10 and the second pile foundation assembly 20 to save on transportation and installation costs. The weight of the first pile foundation 11 can be 10t (tons) to 15t, and the weight of the second pile foundation 21 can be 14t to 20t.

[0068] In a photovoltaic system, one grid unit 30 can correspond to one transformer substation 50, or multiple grid units 30 can be connected to one transformer substation 50. Therefore, the number of first piles 11 within the first pile foundation assembly 10 is not less than the number of second piles 21 within the second pile foundation assembly 20. For example, Figure 2 As shown, the number of first piles 11 in the first pile foundation assembly 10 can be four, and the four first piles 11 are evenly connected to the grid frame 30. The number of second piles 21 in the corresponding second pile foundation assembly 20 can also be four, and the four second piles 21 are evenly connected to the transformer substation platform 40. Alternatively, the number of first piles 11 in the first pile foundation assembly 10 can be eight, and the eight first piles 11 are evenly connected to the grid frame 30. The number of second piles 21 in the corresponding second pile foundation assembly 20 can be four, and the four second piles 21 are evenly connected to the transformer substation platform 40.

[0069] The marine pile foundation structure disclosed herein includes a first pile foundation assembly 10 and a second pile foundation assembly 20. The first pile foundation assembly 10 is used to fix the space frame 30, and the second pile foundation assembly 20 is used to fix the transformer substation platform 40. The first pile foundation assembly 10 includes at least two first piles 11 with steel structures, and the second pile foundation assembly 20 includes at least two second piles 21 with concrete structures. The elevation of the first piles 11 is greater than the elevation of the second piles 21. At the same time, the projections of the transformer substation platform 40 and the space frame 30 on the sea level at least partially overlap, which can improve the compactness of the layout of the space frame 30 and the transformer substation platform 40 and improve the utilization rate of the sea area. In addition, the first piles 11 are made of steel structures and the second piles 21 are made of concrete structures. Using pile foundation assemblies with different elevations and different structures to fix and support different structures can meet the support stability and installation requirements of different components and improve economic efficiency.

[0070] The offshore pile foundation structure provided by the present disclosure can improve the compactness of the grid 30 and the box transformer platform 40 layout, and improve the utilization rate of the sea area; different pile foundation assemblies with different elevations and different structures are used to fix and support different structures, which can meet the support stability and installation requirements of different components, and improve the economy.

[0071] The embodiment of the present disclosure provides an offshore photovoltaic power generation system, which is arranged on a plurality of sea areas and comprises a plurality of photovoltaic arrays. Each photovoltaic array comprises a plurality of offshore photovoltaic pile foundation structures arranged in an array, and the photovoltaic array is used for converting solar energy into electric energy, and each photovoltaic array is arranged on a sea area.

[0072] The offshore photovoltaic power generation system provided by the present disclosure comprises the pile foundation structure, which has high structural compactness and stability, and high practicability. The system can effectively utilize offshore resources through the arrangement of a plurality of photovoltaic arrays.

[0073] Other embodiments of the present disclosure will be readily apparent to those skilled in the art upon considering the description of the specification and practicing the invention disclosed herein. The present application is intended to cover any variations, uses, or adaptive changes of the present disclosure that follow the general principles of the present disclosure and include common knowledge or conventional technical means in the technical field of the present disclosure which are not disclosed by the present disclosure. The specification and examples are only considered as exemplary, and the true scope and spirit of the present disclosure are indicated by the appended claims.

Claims

1. An offshore photovoltaic pile foundation structure, characterized in that, The application relates to a marine photovoltaic pile foundation structure. The marine photovoltaic pile foundation structure comprises a first pile foundation assembly and a second pile foundation assembly. The first pile foundation assembly comprises at least two first pile foundations, each of which is made of a steel structure and has an axis perpendicular to a sea level. The first pile foundation assembly is used for fixing a net rack, and a plurality of photovoltaic panels are arranged on the net rack.

2. The offshore photovoltaic pile foundation structure according to claim 1, characterized in that, The second pile foundation assembly comprises at least two second pile foundations, each of which is made of a concrete structure and has an axis perpendicular to the sea level and the same elevation.

3. The offshore photovoltaic pile foundation structure according to claim 2, characterized in that, The second pile foundation assembly is arranged adjacent to the first pile foundation assembly and is used for fixing a box transformer platform.

4. The offshore photovoltaic pile foundation structure according to claim 3, characterized in that, The box transformer platform and the net rack have at least partial overlap on the sea level.

5. The offshore photovoltaic pile foundation structure according to claim 3, characterized in that, The box transformer platform is provided with a box transformer, and the plurality of photovoltaic panels are connected with the box transformer.

6. The offshore photovoltaic pile foundation structure according to any one of claims 1-5, characterized in that, The elevation of the first pile foundation is greater than the elevation of the second pile foundation.

7. Offshore photovoltaic pile foundation structure according to any of claims 1-5, characterized in that, The height difference between each first pile foundation and the second pile foundation arranged adjacent to the first pile foundation is greater than or equal to a preset height, and the preset height is the sum of the thickness of the box transformer platform and the height of the box transformer.

8. Offshore photovoltaic pile foundation structure according to any of claims 1-5, characterized in that, The net rack and the sea level have a preset included angle.

9. The offshore photovoltaic pile foundation structure according to claim 8, characterized in that, Along the direction in which the opening of the preset included angle increases, the height of each first pile foundation increases in turn.

10. A marine photovoltaic power generation system provided in a plurality of sea areas, characterized by, Along the direction in which the opening of the preset included angle increases, the pile diameter of each first pile foundation decreases in turn. The preset included angle is 10-20 degrees. The weight of the first pile foundation is not greater than the weight of the second pile foundation. The number of the first pile foundations in the first pile foundation assembly is not less than the number of the second pile foundations in the second pile foundation assembly. Each first pile foundation is a hollow structure. Each second pile foundation is a PHC pipe structure. The application further relates to a marine photovoltaic array. Each photovoltaic array comprises a plurality of marine photovoltaic pile foundation structures arranged in an array. Each photovoltaic array is arranged on a sea area. The marine photovoltaic array is used for converting solar energy into electric energy.

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