A grounding method for offshore photovoltaic field
By combining concrete pipe piles and offshore grounding grids, the problems of high construction difficulty and cost of grounding systems in offshore photovoltaic fields have been solved, achieving a safe and reliable grounding effect, reducing construction costs and improving installation efficiency.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- NORTHWEST ENGINEERING CORPORATION LIMITED
- Filing Date
- 2023-08-23
- Publication Date
- 2026-06-16
AI Technical Summary
The lack of mature, safe, and efficient construction methods for offshore photovoltaic field grounding systems leads to high construction difficulty and cost.
The system employs a combination of concrete pipe piles and offshore grounding grids. The conductive grounding carrier inside the concrete pipe piles is electrically connected to the solar panels and the offshore grounding grid. The concrete pipe piles are vertically fixed to the offshore grounding grid to form an effective grounding system with a grounding resistance of less than 0.1 ohms.
This has achieved safety, reliability, and high efficiency in the grounding system of offshore photovoltaic fields, reduced construction costs, and improved installation efficiency and economy.
Smart Images
Figure CN117060107B_ABST
Abstract
Description
Technical Field
[0001] This invention relates to a grounding method in the field of new energy, specifically a grounding method for offshore photovoltaic fields, used in the grounding grid of offshore photovoltaic fields. Background Technology
[0002] Offshore photovoltaic (PV) projects are an emerging industry, and the technological approaches are still being explored. The offshore PV field grounding method is a design and construction method used to implement the grounding system for PV fields on the sea surface or water surface.
[0003] Currently, there are no mature precedents for grounding systems in offshore photovoltaic (PV) fields nationwide. Some surface PV fields, such as those on lakes, tidal flats, and those combining fishing and solar power, employ traditional grounding electrodes with galvanized flat steel designs and construction methods, which are difficult to implement and result in high procurement and construction costs. Similar offshore PV projects are exploring a reliable, safe, and efficient grounding system design and construction method to improve the stability and efficiency of offshore PV field grounding systems, and to achieve operability and cost-effectiveness in the design and construction of PV field grounding systems. Summary of the Invention
[0004] The purpose of this invention is to provide a grounding method for offshore photovoltaic fields, characterized by comprising at least: concrete pipe piles 9, an offshore grounding grid 11, and solar panels 8. Conductive grounding carriers 15 are distributed within the concrete pipe piles 9, including fasteners 16 for fixing the solar panels 8 to the concrete pipe piles 9. The upper conductive grounding carriers 15 of the solar panels 8 and concrete pipe piles 9 are electrically connected, thus fixing the solar panels 8 to the concrete pipe piles 9. The lower conductive grounding carriers 15 of the concrete pipe piles 9 are electrically connected to the offshore grounding grid 11, and the lower end of the concrete pipe piles 9 is fixed to the offshore grounding grid 11, thus fixing the concrete pipe piles 9 together through the foundation of the offshore grounding grid 11. The concrete pipe piles 9 are perpendicular to the sea level 18.
[0005] The upper conductive grounding carrier 15 includes an upper flange plate 1, an upper head steel ring 2, a main reinforcing bar 3, and a reinforcing bar ring 14; the upper flange plate 1 is on top of the upper head steel ring 2, and the upper flange plate 1 is electrically connected and physically fixed to the upper head steel ring 2, the main reinforcing bar 3, and the reinforcing bar ring 14 through a conductor.
[0006] The lower conductive grounding carrier 15 includes a lower flange plate 5, a lower end steel ring 4, a main reinforcing bar 3, and a reinforcing bar ring 14; the lower flange plate 5 is below the lower end steel ring 4, and the lower flange plate 5 is electrically connected and physically fixed to the lower end steel ring 4, the main reinforcing bar 3, and the reinforcing bar ring 14 through a conductor.
[0007] The main reinforcing bars 3 are distributed from top to bottom inside the concrete pipe pile 9 and are tightly fixed by reinforcing bar rings 14 at intervals above and below; the concrete wraps the main reinforcing bars 3 and the reinforcing bar rings 14 into a column shape.
[0008] The solar panels 8 are distributed and fixed on the conductor structure 17 on the concrete pipe pile 9; the conductor structure 17 further connects the conductive grounding carrier 15 and the grounding terminal 7 of the solar panel 8, and connects the marine grounding grid 11, so that the distributed solar panels 8 and the marine grounding grid 11 constitute an effective ground, and the grounding resistance is less than 0.1 ohms.
[0009] The fastener 16 is not limited to bolt hole 12 and bolt 13.
[0010] The concrete pipe pile 9 is a steel pile shoe 6 structure with a diameter decreasing from large to small, or an open steel pile tip 10 with a diameter decreasing from large to small, so as to penetrate deep into the foundation below seawater.
[0011] Grounding terminal 7 is welded to the side of the upper flange plate 1, and bolt holes 12 are reserved for connection with the marine grounding grid 11. The grounding terminal of the solar panel 8 is electrically connected to the marine grounding grid 11 by bolt 13 or welding.
[0012] This invention enables the design and construction of equipment such as grounding electrodes, grounding grids, and grounding electrode connection terminals in the grounding system of the entire offshore photovoltaic field. It ensures that the grounding electrodes of the offshore grounding system can be successfully buried at least 2 meters below the seabed mud surface in a safe, reliable, and efficient manner, so as to meet the requirements of the grounding resistance value.
[0013] This invention utilizes the existing structure to enhance its functionality. It features a simple design, convenient processing and manufacturing, and a simple construction process. It can be widely applied to the design and construction of grounding systems for fixed photovoltaic fields on marine and water surfaces.
[0014] This method can effectively improve the installation efficiency of grounding systems in large-scale offshore photovoltaic fields. By using the original pile foundation structure as the grounding carrier, it saves the cost of additional purchase of grounding electrodes and separate construction of grounding electrodes, thus ensuring the feasibility and economy of the construction plan for the grounding system of offshore photovoltaic projects.
[0015] The present invention will be further described below with reference to the accompanying drawings of this embodiment: Attached Figure Description
[0016] Figure 1 This is a schematic diagram illustrating the principle of the present invention;
[0017] Figure 2 This is a schematic diagram of the ground wire structure in Embodiment 1 of the present invention;
[0018] Figure 3 This is a schematic diagram of the ground wire structure in Embodiment 2 of the present invention.
[0019] In the diagram, 1. Upper flange plate; 2. Upper end steel ring; 3. Main reinforcing bar; 4. Lower end steel ring; 5. Lower flange plate; 6. Steel pile shoe; 7. Grounding terminal; 8. Solar panel; 9. Concrete pipe pile; 10. Open-type steel pile tip; 11. Offshore grounding grid; 12. Bolt hole; 13. Bolt; 14. Reinforcing bar ring; 15. Conductive grounding carrier; 16. Fastener; 17. Conductor structural component; 18. Sea level. Detailed Implementation Example 1
[0020] like Figure 1 As shown, a grounding method for an offshore photovoltaic field is characterized by comprising at least: concrete pipe piles 9, an offshore grounding grid 11, and solar panels 8. Conductive grounding carriers 15 are distributed within the concrete pipe piles 9, including fasteners 16 for fixing the solar panels 8 to the concrete pipe piles 9. The upper conductive grounding carriers 15 of the solar panels 8 and concrete pipe piles 9 are electrically connected, and the solar panels 8 and concrete pipe piles 9 are fixed. The lower conductive grounding carriers 15 of the concrete pipe piles 9 are electrically connected to the offshore grounding grid 11, and the lower end of the concrete pipe piles 9 is fixed to the foundation of the offshore grounding grid 11, so that the concrete pipe piles 9 are fixed together through the foundation of the offshore grounding grid 11. The concrete pipe piles 9 are perpendicular to the sea level 18.
[0021] like Figure 2 As shown, the upper conductive grounding carrier 15 includes an upper flange plate 1, an upper head steel ring 2, a main reinforcing bar 3, and a reinforcing bar ring 14; the upper flange plate 1 is above the upper head steel ring 2, and the upper flange plate 1 is electrically connected and physically fixed to the upper head steel ring 2, the main reinforcing bar 3, and the reinforcing bar ring 14 through a conductor.
[0022] The lower conductive grounding carrier 15 includes a lower flange plate 5, a lower end steel ring 4, a main reinforcing bar 3, and a reinforcing bar ring 14; the lower flange plate 5 is below the lower end steel ring 4, and the lower flange plate 5 is electrically connected and physically fixed to the lower end steel ring 4, the main reinforcing bar 3, and the reinforcing bar ring 14 through a conductor.
[0023] The main reinforcing bars 3 are distributed from top to bottom inside the concrete pipe pile 9 and are tightly fixed by reinforcing bar rings 14 at intervals above and below; the concrete wraps the main reinforcing bars 3 and the reinforcing bar rings 14 into a column shape.
[0024] The solar panels 8 are distributed and fixed on the conductor structure 17 on the concrete pipe pile 9; the conductor structure 17 further connects the conductive grounding carrier 15 and the grounding terminal 7 of the solar panel 8, and connects the marine grounding grid 11, so that the distributed solar panels 8 and the marine grounding grid 11 constitute an effective ground, and the grounding resistance is less than 0.1 ohms.
[0025] The fastener 16 is not limited to bolt hole 12 and bolt 13.
[0026] like Figure 2 and Figure 3 As shown, the concrete pipe pile 9 is a steel pile shoe 6 structure with a diameter decreasing from large to small, or an open steel pile tip 10 with a diameter decreasing from large to small, so as to penetrate into the foundation below seawater.
[0027] Grounding terminal 7 is welded to the side of the upper flange plate 1, and bolt holes 12 are reserved for connection with the marine grounding grid 11. The grounding terminal of the solar panel 8 is electrically connected to the marine grounding grid 11 by bolt 13 or welding.
[0028] (1) The lower end of the concrete pipe pile 9 is an open steel pile tip 10 structure: the lower end flange plate 5 and the open steel pile tip 10 of the concrete pipe pile 9 are used as the grounding electrode for mud entry, which meets the grounding resistance specification requirements.
[0029] like Figure 1 and Figure 2 As shown, there are two ways to ground the electrode of the present invention. Embodiment 1 gives one way, and Embodiment 2 below gives another way. Example 2
[0030] (2) The lower end of the concrete pipe pile 9 is a steel pile shoe 6: The lower end flange plate 5 and steel pile shoe 6 of the concrete pipe pile 9 are used as the grounding electrode for entering the mud to meet the grounding resistance specification requirements.
[0031] Example 2 and Example 1 present two different structures. However, this invention is not limited to these two grounding structures. In this invention, a grounding grid connection terminal 3 is welded to the side of the upper flange plate 1 of the concrete pipe pile 9. The grounding grid connection terminal 3 has bolt holes 4. The vertical main reinforcing bars 3 and reinforcing bar rings 14 in the concrete pipe pile 9 serve as the conductive grounding carrier 15. The main reinforcing bars 3 are electrically connected to the upper flange plate 1 and the lower flange plate 5 of the concrete pipe pile 9. One or more main reinforcing bars 9 can be selected, adjusted according to different design specifications.
Claims
1. A grounding method for offshore photovoltaic fields, characterized in that: At least including: The system comprises concrete pipe piles (9), an offshore grounding grid (11), and solar panels (8). Conductive grounding carriers (15) are distributed within the concrete pipe piles (9), including fasteners (16) for fixing the solar panels (8) and the concrete pipe piles (9). The upper conductive grounding carriers (15) of the solar panels (8) and the concrete pipe piles (9) are electrically connected, thus fixing the solar panels (8) and the concrete pipe piles (9). The lower conductive grounding carriers (15) of the concrete pipe piles (9) are electrically connected to the offshore grounding grid (11), and the lower end of the concrete pipe piles (9) is fixed to the offshore grounding grid (11), enabling the concrete pipe piles (9) to be connected via offshore grounding. The foundation of the net (11) is fixed; the concrete pipe pile (9) is perpendicular to the sea level (18), and the upper conductive grounding carrier (15) includes an upper flange plate (1), an upper head steel ring (2), a main steel bar (3) and a steel bar ring (14); the upper flange plate (1) is above the upper head steel ring (2), and the upper flange plate (1) is electrically connected and physically fixed to the upper head steel ring (2), the main steel bar (3) and the steel bar ring (14) through a conductor. The lower conductive grounding carrier (15) includes a lower flange plate (5), a lower head steel ring (4), a main steel bar (3) and a steel bar ring (14); the lower flange plate (5) is below the lower head steel ring (4). The lower flange plate (5) is electrically connected and physically fixed to the lower end steel ring (4), main steel bar (3) and steel bar ring (14) through a conductor. The main steel bar (3) is distributed from top to bottom inside the concrete pipe pile (9) and is tightly fixed by the steel bar ring (14) at intervals. The concrete wraps the main steel bar (3) and steel bar ring (14) into a column shape. The solar panels (8) are distributed and fixed on the conductor structure (17) on the concrete pipe pile (9). The conductor structure (17) electrically connects the grounding carrier (15) and the grounding terminal (7) of the solar panel (8) and electrically connects the marine grounding grid (11) so that the distributed solar panels (8) and the marine grounding network (11) constitute an effective grounding with a grounding resistance of less than (0.1) ohms. The fastener (16) is not limited to bolt holes (12) and bolts (13). The concrete pipe pile (9) is a steel pile shoe (6) structure with a diameter decreasing from large to small, or an open steel pile tip (10) with a diameter decreasing from large to small, so as to penetrate into the foundation below the seawater. The upper flange plate (1) is welded with grounding terminals (7) on the side, and bolt holes (12) for connection with the marine grounding network (11) are reserved. The grounding end of the solar panel (8) is electrically connected to the marine grounding network (11) by bolt (13) connection or welding.