Lightweight prepackaged offshore booster station, construction method and offshore wind power system

Abstract

This invention relates to the field of offshore wind power technology, and more particularly to a lightweight prefabricated offshore substation, its construction method, and an offshore wind power system. The prefabricated offshore substation comprises a double-layer platform structure, including a bottom platform and a top platform. The bottom platform is the equipment layer, with the main transformer and auxiliary equipment arranged in the central area. A GIS equipment compartment is located on one side of the equipment layer, and an emergency power distribution room, a substation power distribution room, a communication and relay protection room, and a battery room are arranged on the other side. A bottom-mounted emergency oil tank is installed below the bottom platform. The top platform houses a prefabricated pump room and a prefabricated living area compartment. This invention significantly reduces the number of cable trays used, and the cable tray and pipeline layout is extremely simple in both planar and spatial design, greatly simplifying the construction process, reducing construction difficulty, and saving a significant amount of construction time.

Description

Technical Field

[0001] This invention relates to the field of offshore wind power technology, and in particular to a lightweight prefabricated offshore substation, its construction method, and an offshore wind power system. Background Technology

[0002] Offshore substations are key facilities in offshore wind farms, used to boost the voltage of electricity generated by wind turbines before transmitting it to the onshore power grid. Currently, the platform structure of offshore substations is developing towards lightweight, modular, and standardized designs. To meet the requirements of modularity and prefabrication, the superstructure is becoming more compact and symmetrically arranged, and the platform space is being continuously reduced while still meeting specifications.

[0003] Existing offshore substations mainly have two structural forms: traditional integrated type and traditional prefabricated type. The traditional prefabricated offshore substation designs the main equipment in a modular fashion according to system and function. Each module is constructed and installed separately in the form of prefabricated cabins, and finally assembled and commissioned as a whole. This approach has advantages over the traditional integrated type in terms of construction cycle and efficiency.

[0004] In traditional prefabricated offshore substations, the main transformer and GIS equipment are typically located on the top floor, resulting in complex planar and spatial arrangements for submarine cable trays and conduits. The size and structural characteristics of the prefabricated modules prevent the installation of crane rails inside the GIS equipment compartments, hindering equipment maintenance. Furthermore, to meet fire safety requirements, a separate firewall support structure is needed outside the main structural system. This structure only provides enclosure support and does not participate in the overall structural load-bearing, leading to steel waste. Simultaneously, the prefabricated GIS equipment modules are difficult and expensive to manufacture, and their installation is challenging and risky. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a lightweight prefabricated offshore booster station that uses less structural steel, has higher construction efficiency, and is easier to inspect and maintain.

[0006] To achieve the above objectives, the embodiments of the present invention provide the following technical solutions: In a first aspect, embodiments of the present invention provide a lightweight prefabricated offshore booster station, comprising a double-layer platform structure, the double-layer platform structure including a bottom platform and a top platform; the bottom platform is an equipment layer, the central area of ​​the equipment layer is arranged with a main transformer and auxiliary equipment, one side of the equipment layer is arranged with a GIS equipment compartment, and the other side of the equipment layer is arranged with an emergency power distribution room, a substation power distribution room, a communication relay protection room and a battery room; an under-mounted emergency oil tank is provided below the bottom platform; the top platform is arranged with a prefabricated pump room compartment and a prefabricated living area compartment.

[0007] As a further technical solution, a space truss structure is also included, which is composed of steel beams, columns and supports, and supports the bottom platform and the top platform.

[0008] As a further technical solution, a ring-shaped passage is provided on the bottom platform; each compartment is separated by corrugated steel plates, the surface of which is coated with fire-retardant paint, and a crane track is provided in the GIS equipment compartment.

[0009] As a further technical solution, the under-mounted emergency fuel tank includes a tank body and a fuel tank frame. The fuel tank frame is located on the lower side of the bottom truss and includes a bottom support and a side support. The tank body is installed on the fuel tank frame.

[0010] As a further technical solution, the box is provided with a partition, the bottom side of the partition is provided with an oil passage hole, and the box is provided with a curved drain pipe.

[0011] As a further technical solution, a submarine cable channel is provided in the middle of the box, and the submarine cable channel runs vertically through the box.

[0012] As a further technical solution, an oil baffle system is also included, which includes an oil baffle and a support structure, wherein the height of the oil baffle is determined based on the oil volume.

[0013] As a further technical solution, the top platform is equipped with a roof crane, equipment maintenance holes, HVAC equipment, and communication equipment; the top of the prefabricated living area cabin is equipped with a helicopter hovering platform; and the hydrodynamic system in the prefabricated pump room cabin is located at a high position.

[0014] Secondly, embodiments of the present invention also provide a construction method for a lightweight prefabricated offshore booster station, comprising the following steps: With the main columns as the base support, the lower chord of the first-layer truss is assembled, and temporary supports are added around the perimeter before the spatial truss structure is formed. Simultaneously fabricate the prefabricated pump room and the prefabricated living area; Add auxiliary support columns, diagonal braces, and oil baffles; install a bottom-mounted emergency fuel tank. Assemble the upper chord of the truss, install the first-floor bulkhead, and hoist and install the main transformer and its radiator; Install the steel beams on top of the main transformer to form a space truss structure, install the roof of the first-floor compartment, and install GIS equipment and power distribution cabinets; Install the top deck of the main transformer and debug the electrical equipment; Hoist and install the prefabricated modules for the pump room and living area, and connect the upper and lower level pipelines and submarine cables; Self-propelled modular transport vehicles or railcars are used to transfer the upper modules of the offshore booster station to the transport ship; A marine wind power system is characterized by comprising a lightweight prefabricated marine substation as described in any one of claims 1 to 8, wherein the upper module of the marine substation is in place after the offshore hoisting is completed and the submarine cable is connected.

[0015] Thirdly, embodiments of the present invention also provide an offshore wind power system, including the lightweight prefabricated offshore booster station as described above.

[0016] One or more technical solutions provided in the embodiments of the present invention have at least the following technical effects or advantages: The lightweight prefabricated offshore substation of this invention, by arranging core equipment such as the main transformer and GIS equipment on the first floor (i.e., the bottom floor), allows submarine cables to be directly connected from the bottom deck or side of the GIS equipment compartment, eliminating the need for a complex top suspension structure and solving the problem of complex planar and spatial layout of cable trays and pipelines. Furthermore, with only two platforms and the top compartment being a prefabricated module, the space truss structure is reduced from the traditional 2-3 layers to one, thus reducing steel consumption. In addition, the main transformer and GIS equipment can be installed immediately after the bottom truss is in place, minimizing interference between structural construction and equipment installation, greatly simplifying the construction process, reducing construction difficulty, and saving significant time. Moreover, the under-mounted emergency oil tank utilizes the lower chord space of the truss, serving as both a functional component and a means of enhancing structural strength, saving both space and a significant amount of steel.

[0017] Advantages of additional aspects of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. The drawings described below are only some embodiments recorded in the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. In addition, the dimensions or spacing between the components are exaggerated to show the position of each component, and the schematic diagrams are for illustrative purposes only.

[0019] Figure 1 This is a first-floor layout diagram provided in an embodiment of the present invention; Figure 2 This is a diagram illustrating the construction of the oil baffle provided in an embodiment of the present invention; Figure 3 This is a schematic diagram of the under-mounted emergency fuel tank frame provided in an embodiment of the present invention; Figure 4This is a schematic diagram of the under-mounted emergency fuel tank provided in an embodiment of the present invention; Figure 5 This is a top-level layout diagram provided in an embodiment of the present invention; Figure 6 This is a diagram of the cabin roof arrangement provided in an embodiment of the present invention; Figure 7 This is a structural layout diagram provided in an embodiment of the present invention; Figure 8 This is a schematic diagram of step one of the construction method provided in this embodiment of the invention; Figure 9 This is a schematic diagram of step two of the construction method provided in this embodiment of the invention; Figure 10 This is a schematic diagram of step three of the construction method provided in this embodiment of the invention; Figure 11 This is a schematic diagram of step four of the construction method provided in this embodiment of the invention; Figure 12 This is a schematic diagram of step five of the construction method provided in this embodiment of the invention; Figure 13 This is a schematic diagram of step six of the construction method provided in this embodiment of the invention; Figure 14 This is a schematic diagram of step seven of the construction method provided in this embodiment of the invention; Figure 15 This is a schematic diagram of step eight of the construction method provided in this embodiment of the invention; Figure 16 This is a schematic diagram of step nine of the construction method provided in this embodiment of the invention; In the diagram: 1. Main transformer; 2. GIS equipment; 3. Oil tank frame; 4. Submarine cable channel; 5. Bulkhead; 6. Drainage pipe; 7. Oil passage hole; 8. Prefabricated pump room; 9. Prefabricated living area; 10. Bottom platform; 11. Top platform; Detailed Implementation To more clearly illustrate the technical solutions of the embodiments in this specification, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are merely some examples or embodiments of this specification. For those skilled in the art, these drawings can be applied to other similar scenarios without creative effort. Unless obvious from the linguistic context or otherwise specified, the same reference numerals in the drawings represent the same structures or operations.

[0020] Generally speaking, the terms "comprising" and "including" only indicate that the steps and elements are explicitly identified, and these steps and elements do not constitute an exclusive list. The method or apparatus may also include other steps or elements.

[0021] Example 1 Currently, lightweight, modular, and standardized designs are the development trend for offshore substation platform structures. To meet the requirements of modularity and prefabrication, the superstructure is designed to be more compact and symmetrically arranged. The space on the platform is being continuously compressed while still meeting relevant specifications, which also has a certain impact on the structural form and layout of offshore substation platforms. The two most commonly used structural forms and layouts are as follows: Traditional integrated type: The upper module of the integrated offshore substation is a whole, and the structure is built as a whole. The equipment can only be installed after the main structure is completed. In this type of scheme, the structural construction and equipment installation interfere with each other, resulting in low construction efficiency and long construction period. Moreover, in order to meet the requirements of equipment and operating space, there are often more than 3 floors. The main transformer and GIS equipment in the core area of ​​the offshore substation are located on the top floor, which makes the cable trays and pipelines more complex in both plan and space.

[0022] Traditional prefabricated type: Traditional prefabricated offshore substation platforms modularize the main equipment according to system and function, with each module constructed and installed separately in the form of prefabricated cabins, and finally assembled, commissioned and put into operation. Compared with the traditional monolithic type, this approach has significant advantages in construction cycle and efficiency. However, due to the size and structural characteristics of the prefabricated cabins, it is impossible to install large-tonnage crane tracks inside the GIS equipment room, making maintenance and operation inconvenient. The main transformer and GIS equipment in the core area of ​​the offshore substation are located on the top floor, resulting in a more complex layout of cable trays and pipelines in both plan and space. In addition, a separate firewall support structure must be set up outside the structural system, which only provides enclosure support and does not participate in the overall structural system, resulting in a certain amount of steel waste and high cost. Furthermore, the prefabricated cabins for GIS equipment in traditional prefabricated offshore substations are difficult to manufacture, have high manufacturing thresholds, are expensive, and are difficult and risky to install.

[0023] Compared to the traditional layout of offshore substations, this invention does not simply place core equipment such as main transformers and GIS equipment on the ground floor. Rather, it proposes a series of innovative solutions to support this core layout concept. This not only realizes the layout concept of placing core equipment such as main transformers and GIS equipment on the ground floor, but more importantly, it maximizes its advantages.

[0024] In a typical embodiment of this disclosure, a lightweight prefabricated offshore booster station is provided. This booster station has a double-layer platform structure, comprising a bottom platform 10 and a top platform 11. The bottom platform 10 is the equipment layer, with the main transformer 1 and auxiliary equipment arranged in its central area, a GIS equipment 2 compartment arranged on one side, and an emergency power distribution room, a substation power distribution room, a communication relay protection room, and a battery room arranged on the other side. A bottom-mounted emergency oil tank is installed below the bottom platform 10. The top platform 11 houses a prefabricated pump room 8 and a prefabricated living quarters 9.

[0025] Traditional offshore substations typically place these two types of core equipment on the top or middle levels, resulting in complex planar and spatial arrangements for submarine cable trays and pipelines. This application moves the core equipment layer, including the main transformer 1 and its auxiliary equipment, the GIS equipment 2 compartment, and others, to the bottom platform 10. Submarine cables can be directly connected from the sea to the bottom of the first deck, eliminating or significantly reducing the need for cable trays suspended from the top of the first deck, thus simplifying the arrangement of cables and pipelines. Simultaneously, a bottom-mounted emergency oil tank is installed below the bottom platform 10 to collect leaked insulating oil in case of an accident, preventing pollution of the marine environment. The top platform 11 houses the prefabricated pump room 8 and the prefabricated living quarters 9. The hydrodynamic system within the pump room is located at an elevated position, utilizing gravitational potential energy to reduce pump power.

[0026] Because the core equipment is located at the bottom, the submarine cable can be directly connected from the bottom of the deck or the side of the bulkhead of GIS equipment compartment 2, eliminating the need for a complex top suspension structure. Furthermore, with only two platforms and the top compartment using a prefabricated form, the space truss structure is reduced from the traditional two to three layers to one, thus reducing steel consumption. In addition, the main transformer 1 and GIS equipment 2 can be installed immediately after the bottom truss is in place, reducing interference between structural construction and equipment installation and improving construction efficiency. The under-mounted emergency oil tank utilizes the lower chord space of the truss, serving both as a functional component and enhancing structural strength.

[0027] In some further specific examples of this disclosure, the booster station also includes a space truss structure, which is composed of steel beams, columns and supports that support the bottom platform 10 and the top platform 11.

[0028] The space truss structure is the load-bearing skeleton of the offshore substation. It is a stable system composed of beams, columns and supports, which can meet the strength requirements under operating conditions, extreme conditions and hoisting conditions. The tank skeleton 3 of the emergency fuel tank is set on the lower side of the bottom truss, which can increase the planar stiffness of the first deck.

[0029] In other specific examples disclosed herein, a circular passageway is provided on the bottom platform 10 to meet escape requirements. The compartments are separated by corrugated steel sheets coated with fire-retardant paint to ensure fire safety. A crane track is provided inside the GIS equipment 2 compartment.

[0030] Traditional prefabricated GIS equipment 2 compartments in offshore substations cannot accommodate large-tonnage crane tracks due to their size and structural characteristics, making maintenance and operation inconvenient. In this application, the GIS equipment 2 compartment is part of the platform structure system, with its height matching that of the main transformer 1 compartment, resulting in greater structural strength. Therefore, crane tracks can be installed to meet the hoisting requirements of GIS equipment 2 during maintenance.

[0031] In other specific examples of this disclosure, the undermount emergency fuel tank includes a tank body and a tank frame 3. The tank frame 3 is located on the lower side of the bottom truss and includes bottom supports and side supports, with the tank body mounted on the tank frame 3.

[0032] The fuel tank frame 3 utilizes the structural space of the bottom truss. After the tank is installed on the frame, it has reliable structural support on all four sides. This can increase the planar rigidity of the first deck and also serve as support for the submarine cable access corridor, facilitating the installation of submarine cables.

[0033] In other specific examples of this disclosure, a partition 5 is provided in the tank, with an oil passage hole 7 on the bottom side of the partition 5, and a curved drain pipe 6 is provided on the tank. When an accidental oil discharge occurs, the leaked oil enters the tank, and the oil passage hole 7 on the bottom side of the partition 5 allows the oil to pass through slowly, serving as a buffer and separation function. The curved drain pipe 6 uses atmospheric pressure to drain the internal water.

[0034] In other specific examples disclosed herein, a submarine cable channel 4 is provided in the middle of the enclosure, and the submarine cable channel 4 vertically penetrates the enclosure. The submarine cable runs along the submarine cable corridors on both sides of the emergency tank to the submarine cable channel 4 at the main transformer 1, and is connected to the main transformer 1 through the submarine cable channel 4. Integrating the submarine cable channel 4 in the middle of the emergency tank makes full use of the space below the emergency tank and avoids the additional space and structural materials occupied by setting up the submarine cable channel 4 separately.

[0035] In other specific examples of this disclosure, the substation also includes an oil baffle system, which comprises an oil baffle and a supporting structure. The height of the oil baffle is determined based on the oil volume. The oil baffle system is installed around the main transformer 1 and its radiator, forming an above-ground emergency oil pit, replacing the traditional emergency oil pool. The height of the oil baffle is determined based on the oil volume of the main transformer 1, ensuring that leaked oil is effectively contained in the event of an accident and does not spread to other areas.

[0036] In other specific examples disclosed herein, the top platform 11 is equipped with a rooftop crane, equipment access hatches, HVAC equipment, and communication equipment. The top of the prefabricated living quarters 9 is equipped with a helicopter hovering platform for easy transport of materials and personnel. The hydrodynamic system within the prefabricated pump room 8 is located at a high position, relying on gravitational potential energy for water supply, which reduces pump power and lowers construction and maintenance costs. The rooftop crane includes one 5-ton large crane and two 1-ton small cranes. Compared to the bottom platform 10, which is affected by structural bracing, the top platform 11 is more spacious and facilitates crane operation. Access hatches with covers are provided on the top of core equipment such as the main transformer 1 and GIS equipment 2. The top-floor maintenance platform is spacious and easy to inspect and maintain. A lifeboat is also provided on the top floor to meet safety escape requirements.

[0037] The following description is based on the accompanying drawings. This embodiment takes an offshore substation platform with two main transformers 1 as an example. The underlying logic of the arrangement is the same when the number of main transformers 1 is increased.

[0038] Layout scheme: The layout of this invention is based on the equipment operation requirements and structural characteristics. Under the premise of ensuring reliable operation and easy maintenance, it is compact and saves space.

[0039] First floor layout plan: like Figure 1 As shown, the first floor is the equipment floor, with two main transformers 1 and auxiliary equipment arranged in the central core area; one side of the platform is the GIS equipment 2 compartment, which is equipped with a crane for easy maintenance of GIS equipment 2; the other side of the platform is equipped with an emergency power distribution room, station substation power distribution room, communication relay protection room and battery room, etc.

[0040] The platform entrance is enclosed by a fire-resistant bulkhead that meets regulatory requirements, and a circular passageway surrounds the platform to facilitate escape. Cables are routed from the bottom of the deck or the side of the bulkhead in GIS equipment compartment 2, eliminating or significantly reducing the need for cable trays suspended from the top of the first floor. Each compartment is separated by corrugated steel sheets coated with fire-retardant paint to ensure fire safety.

[0041] like Figure 2 , Figure 3 , Figure 4 As shown, the accident tank is a bottom-mounted type with reliable structural support on all four sides, which can increase the rigidity of the first deck plan. At the same time, the support can also serve as the support for the submarine cable access corridor, which facilitates cable installation. A submarine cable channel 4 is set in the middle of the accident tank. The submarine cable runs along the submarine cable corridors on both sides of the accident tank to the submarine cable channel 4 of the main transformer 1 and is connected to the main transformer 1 through the submarine cable channel 4. A curved drain pipe 6 is installed inside the accident tank to drain the internal water using atmospheric pressure.

[0042] To address the issue of emergency oil drainage for main transformer 1 and its radiator, the concept of an above-ground emergency oil pit is introduced, along with an oil baffle system. The height of the oil baffle is determined based on the oil volume, and reliable supports are installed around it to meet the oil drainage requirements in case of an accident.

[0043] Top-floor layout plan: like Figure 5 , Figure 6 As shown, the top is a deck level, housing fire and domestic water equipment, diesel tank rooms, and rest areas; the top is also equipped with a roof crane, equipment access hatches, HVAC and communication equipment.

[0044] The top floor is equipped with a prefabricated pump room 8. The hydrodynamic system inside the pump room is located at a high position. Relying on gravitational potential energy, the power of the pumps can be reduced, thereby reducing construction and operation and maintenance costs.

[0045] The helicopter hovering platform is located on top of the prefabricated cabin 9 in the living area, which is more conducive to the transportation of materials and personnel.

[0046] A 5-ton large crane and two 1-ton small cranes are installed on the top floor. Compared with the bottom platform 10 (which is affected by the structural diagonal bracing), the top platform 11 is more spacious.

[0047] The main transformer 1, GIS equipment 2 and other core equipment are all equipped with inspection holes with covers on the top. The top-level maintenance platform is more open and easier to inspect and maintain.

[0048] One lifeboat is installed on the top floor.

[0049] In other embodiments, the prefabricated pump room and living area 9 on the top floor can also adopt the traditional bulkhead type, and the design and construction process is relatively traditional, which will not be described in detail here.

[0050] Structural scheme: like Figure 7 As shown, the offshore substation platform structure is a space truss structure composed of steel beams, columns, and supports. It adopts a stable structural system, and the main equipment is symmetrically arranged with uniform load distribution. The example project is used for simulated structural calculations. The structural system and structural strength meet the requirements of operating conditions, extreme conditions, and hoisting conditions. The calculation process is not described in detail here.

[0051] In summary, the lightweight prefabricated offshore booster station provided in this embodiment has the following advantages: This invention departs from the traditional arrangement of placing the main transformer 1 and GIS equipment 2 on the top or middle layer. Instead, it places the core equipment, including the main transformer 1 and GIS equipment 2, on the first floor, with the submarine cable directly connected from the sea to the bottom of the first deck. This solves the problem of complex cable tray and conduit layouts both in plan and space. This invention significantly reduces the number of cable trays required, simplifies the cable tray and conduit layout both in plan and space, streamlines the construction process, reduces construction difficulty, and saves considerable construction time.

[0052] This invention places core equipment such as the main transformer 1 and GIS equipment 2 on the first floor, and installs the pump house and living area on the platform roof in the form of prefabricated cabins. The GIS equipment 2 and the main transformer 1 are separated by a fireproof bulkhead. Compared with traditional prefabricated offshore substations, this invention eliminates the need for a top firewall and its supports through its layout advantages, significantly reducing the amount of steel used.

[0053] Compared to prefabricated offshore substations, the height of the GIS equipment room 2 in this invention is the same as that of the main transformer room 1, which is higher. Moreover, the room frame is part of the platform structure system, resulting in greater structural strength. This solves the problem that the prefabricated GIS equipment room 2 of the prefabricated offshore substation cannot be equipped with large-tonnage crane tracks, and meets the requirements for setting up large-tonnage crane tracks in the GIS equipment room 2.

[0054] Compared to traditional integrated offshore substations, this invention has only two platforms, and the top layer is a prefabricated cabin. The space truss structure is reduced from 2-3 layers to 1 layer, which greatly reduces the amount of steel used. After the first layer of truss is in place, the main transformer 1 and GIS equipment 2 can be installed, which greatly simplifies the construction process, reduces the construction difficulty, and shortens the construction period.

[0055] To address the issue of emergency oil drainage when placing the main transformer 1 and radiator on the ground floor, this invention introduces the concept of an above-ground emergency oil pit and an oil baffle system (which has been successfully applied in the project). This replaces the traditional transformer and radiator-mounted emergency oil pool with an above-ground emergency oil pit. Furthermore, the traditional emergency oil tank is replaced with a bottom-mounted emergency oil tank to meet the needs of emergency oil drainage. Compared to the traditional oil tank placed on the deck and not participating in the structural system, the bottom-mounted oil tank utilizes the lower chord of the truss, serving as both a functional component and enhancing structural strength. This saves space and a significant amount of steel.

[0056] This invention uses a prefabricated module 9 for the pump room and living area. Compared with the traditional prefabricated GIS equipment 2 module for offshore booster stations, the prefabricated module 9 for the pump room and living area is easier and cheaper to manufacture. It also solves the problems of high difficulty and high risk in hoisting the prefabricated GIS equipment 2 module.

[0057] Example 2 This embodiment provides a construction method for a lightweight prefabricated offshore substation. The method includes the following steps: Using the main columns as the foundation support, assemble the lower chord of the first-layer truss. Before the spatial truss structure is formed, temporary supports are added around the perimeter to ensure structural safety during construction. Simultaneously fabricate the prefabricated pump room module 8 and the prefabricated living area module 9. The fabrication sites can be different from the main structure, allowing for parallel operations. Add auxiliary columns, diagonal braces, and oil baffles, and install a bottom-mounted emergency oil tank. Assemble the upper chord of the truss, install the first-layer bulkhead, and hoist and install the main transformer 1 and its radiator. Install the top steel beam of the main transformer 1 to form a spatial truss structure, install the top plate of the first-layer compartment, and install the GIS equipment 2 and distribution cabinet. Install the top deck of the main transformer 1 and begin commissioning the electrical equipment. Hoist and install the prefabricated pump room module 8 and the prefabricated living area module 9, connecting the upper and lower layer pipelines and submarine cables. Use a self-propelled modular transport vehicle or railcar to transfer the upper modules of the offshore substation to a transport ship. After the offshore hoisting was completed, the upper module of the offshore booster station was in place and connected to the submarine cable.

[0058] This construction method allows for the installation of the main transformer 1 and GIS equipment 2 immediately after the first-floor truss is in place, eliminating the need to wait for the completion of the top-floor structure and reducing interference between structural construction and equipment installation. The prefabricated pump room 8 and the prefabricated living area 9 are manufactured off-site concurrently with the main structure construction and then hoisted and installed, shortening the overall construction cycle. Compared to traditional prefabricated offshore substations, the prefabricated modules in this method—the pump room and living area—are significantly less difficult and expensive to manufacture than the prefabricated GIS equipment 2 module, and also carry lower hoisting risks.

[0059] The specific construction process is as follows: Figures 8-16 As shown, like Figure 8 As shown, Step 1: Using the four main columns as the foundation support, assemble the lower chord of the first-layer truss. Before the spatial truss structure is formed, add temporary supports around the perimeter to ensure structural safety during construction. Simultaneously begin the fabrication of the prefabricated pump room 8 and the prefabricated living area 9. The fabrication site can be different from the main structure. The conventional construction process will not be described in detail here.

[0060] like Figure 9 As shown, step two: add auxiliary support columns, diagonal braces and oil baffles (the structural support is omitted from the diagram for clearer display); install the lower-mounted emergency fuel tank.

[0061] like Figure 10 As shown, step three: assemble the upper chord of the truss, install the first-floor bulkheads such as GIS equipment compartment 2, and hoist and install the main transformer 1 and its radiator.

[0062] like Figure 11 As shown, step four: install the top steel beam of the main transformer 1 to form a space truss structure, install the top plate of the first-floor cabin, and install the GIS equipment 2 and the power distribution cabinet.

[0063] like Figure 12 As shown, step five: install the top deck of main transformer 1 and begin commissioning of electrical equipment.

[0064] like Figure 13 As shown, step six: hoist and install the prefabricated pump room module 8 and the prefabricated living area module 9, and connect the upper and lower layer pipes and cables.

[0065] like Figure 14 As shown, step seven: After installation and commissioning are completed, the upper modules of the offshore booster station are transferred to the transport ship using a self-propelled modular transport vehicle or railcar.

[0066] like Figure 15 As shown, step eight: Complete the offshore hoisting, position the upper module of the offshore booster station, and connect the submarine cable. Construction completed as follows: Figure 16 As shown.

[0067] Example 3 This embodiment provides an offshore wind power system, including a lightweight prefabricated offshore booster station as described in Embodiment 1. This offshore wind power system transmits electricity generated by the offshore wind farm to the onshore power grid after being boosted by the booster station. Due to the adoption of the aforementioned booster station structure, the construction cycle, steel consumption, and ease of operation and maintenance of the entire system are all improved.

[0068] While the specific embodiments of the present invention have been described above, they are not intended to limit the scope of protection of the present invention. Those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art without creative effort based on the technical solutions of the present invention are still within the scope of protection of the present invention.

Claims

1. A lightweight prefabricated offshore booster station, characterized in that, It includes a two-layer platform structure, which comprises a bottom layer platform and a top layer platform; The bottom platform is the equipment layer. The main transformer and auxiliary equipment are arranged in the middle area of ​​the equipment layer. A GIS equipment compartment is arranged on one side of the equipment layer, and an emergency power distribution room, a substation power distribution room, a communication relay protection room, and a battery room are arranged on the other side of the equipment layer. An undermount emergency fuel tank is installed below the underlying platform; The top-level platform is equipped with prefabricated modules for the pump room and living quarters.

2. The lightweight prefabricated offshore booster station as described in claim 1, characterized in that, It also includes a space truss structure, which is composed of steel beams, columns and supports, and supports the bottom platform and the top platform.

3. The lightweight prefabricated offshore booster station as described in claim 1, characterized in that, A circular passageway is provided on the bottom platform; each compartment is separated by corrugated steel plates, the surface of which is coated with fire-retardant paint, and a crane track is provided in the GIS equipment compartment.

4. The lightweight prefabricated offshore booster station as described in claim 1, characterized in that, The under-mounted emergency fuel tank includes a tank body and a fuel tank frame. The fuel tank frame is located on the lower side of the bottom truss and includes a bottom support and a side support. The tank body is installed on the fuel tank frame.

5. The lightweight prefabricated offshore booster station as described in claim 4, characterized in that, The box is equipped with a partition, the bottom side of which has an oil passage hole, and the box is equipped with a curved drain pipe.

6. The lightweight prefabricated offshore booster station as described in claim 4, characterized in that, A submarine cable channel is provided in the middle of the enclosure, and the submarine cable channel runs vertically through the enclosure.

7. The lightweight prefabricated offshore booster station as described in claim 1, characterized in that, It also includes an oil baffle system, which includes an oil baffle and a support structure, the height of which is determined based on the oil volume.

8. The lightweight prefabricated offshore booster station as described in claim 1, characterized in that, The top platform is equipped with a rooftop crane, equipment access panels, HVAC equipment, and communication equipment; the top of the prefabricated living area cabin is equipped with a helicopter hovering platform; and the hydrodynamic system in the prefabricated pump room cabin is located at a high position.

9. A construction method for a lightweight prefabricated offshore booster station, characterized in that, Includes the following steps: With the main columns as the base support, the lower chord of the first-layer truss is assembled, and temporary supports are added around the perimeter before the spatial truss structure is formed. Simultaneously fabricate the prefabricated pump room and the prefabricated living area; Add auxiliary support columns, diagonal braces, and oil baffles; install a bottom-mounted emergency fuel tank. Assemble the upper chord of the truss, install the first-floor bulkhead, and hoist and install the main transformer and its radiator; Install the steel beams on top of the main transformer to form a space truss structure, install the roof of the first-floor compartment, and install GIS equipment and power distribution cabinets; Install the top deck of the main transformer and debug the electrical equipment; Hoist and install the prefabricated modules for the pump room and living area, and connect the upper and lower level pipelines and submarine cables; Self-propelled modular transport vehicles or railcars are used to transfer the upper modules of the offshore booster station to the transport ship; After the offshore hoisting was completed, the upper module of the offshore booster station was in place and connected to the submarine cable.

10. An offshore wind power system, characterized in that, Including the lightweight prefabricated offshore booster station as described in any one of claims 1 to 8.

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