Construction Power Supply System for Offshore Wind Turbine Foundation Based on Multi-Pile Steel Pile Cap

Abstract

The present invention relates to the technical field of offshore power supply, and discloses a construction power supply system based on a multi-pile steel caisson type offshore wind turbine foundation, which comprises: a wind turbine foundation unit, a power generation unit and a power supply unit. The wind turbine foundation assembly includes: a first pipe pile and a second pipe pile with a bottom connection, and a caisson arranged on the top of the pipe pile. The power generation unit includes: a wind power generation module and a hydraulic power generation module. The energy conversion sub-module in the hydraulic power generation module can generate electricity by using the seawater entering the first pipe pile, and the drainage sub-module is arranged in the second pipe pile to drain the water in the pipe pile. The construction power supply unit is connected to the wind power generation module and the hydraulic power generation module, and is also connected to the construction power consumption facilities through a power supply cable. The present invention can supply power to the construction power consumption facilities for the construction of an offshore wind farm, and the hydraulic power generation module uses seawater as a working medium for power generation, and the power generation process is clean and pollution-free. Seawater can be obtained locally, is easy to obtain, and has a low cost.

Description

Technical Field

[0001] The present invention relates to the technical field of offshore power supply, and particularly relates to a construction power supply system based on a multi-pile steel caisson type offshore wind turbine foundation. Background Art

[0002] With the increasing global demand for clean energy, offshore wind power has become an important direction for the global wind power development due to its advantages such as rich resources, high power generation efficiency, and no occupation of onshore land resources, which is of great significance for promoting the transformation of the energy structure.

[0003] The multi-pile steel caisson type offshore wind turbine foundation has been widely used due to its good bearing performance and moderate requirements for construction vessels. The multi-pile steel caisson type offshore wind turbine foundation includes: a caisson and multiple foundation piles. Currently, the caisson is mostly a steel caisson, and the foundation piles mostly adopt steel pipe piles. Multiple steel pipe piles are driven into the seabed, and then the steel caisson is inserted into the top of the steel pipe piles. High-strength grouting material is injected between the steel caisson and the top of the steel pipe piles for connection to form a stable wind turbine foundation. Then, the tower of the wind turbine generator is installed on the steel caisson, and the wind turbine generator can be stably connected to the grid for power generation.

[0004] During the construction stage of an offshore wind farm, a construction power supply system needs to be set up. For example, equipment debugging of the wind farm, engineering equipment (small cranes, welding machines, grouting material mixers, air compressors, etc.), handheld electric tools, as well as temporary lighting equipment, temporary communication base stations, construction period monitoring equipment, etc. all require electricity. Generally, during the construction stage of an offshore wind farm, the condition of using shore power is not available. Currently, temporary power supply is generally carried out by relying on the power supply system of construction vessels or mobile diesel generators. On the one hand, the cost of transporting and using diesel for power generation is relatively high; on the other hand, the diesel used by diesel generators is not a clean energy source and will cause pollution. Summary of the Invention

[0005] In view of this, the present invention provides a construction power supply system based on a multi-pile steel caisson type offshore wind turbine foundation to solve the problems that during the construction stage of an offshore wind farm, the condition of using shore power is not available, and temporary power supply needs to be carried out through construction vessels or diesel generators, resulting in high transportation and use costs of diesel, difficult transportation of diesel, and pollution.

[0006] In a first aspect, the present invention provides a construction power supply system based on a multi-pile steel caisson type offshore wind turbine foundation, including:

[0007] A wind turbine foundation unit, the wind turbine foundation unit includes: a first pipe pile, a second pipe pile, and a caisson. The bottoms of the first pipe pile and the second pipe pile are connected through a connecting pipe, and the caisson is connected to the tops of the first pipe pile and the second pipe pile;

[0008] Power generation unit, the power generation unit includes: a wind power generation module and a hydraulic power generation module. The wind power generation module is arranged on the bearing platform. The hydraulic power generation module includes: an energy conversion sub-module and a drainage sub-module. The first pipe pile is provided with a water inlet, and the water inlet is located above the energy conversion sub-module. The energy conversion sub-module is adapted to generate electricity by using the seawater entering the first pipe pile from the water inlet. The drainage sub-module is arranged on the second pipe pile, and it includes: a pumping facility and a drainage facility connected to each other, and one end of the drainage facility extends out of the outer side of the fan foundation unit. The pumping facility is used to pump the seawater in the second pipe pile to the drainage facility, and the drainage facility is used to drain the seawater outside the fan foundation unit;

[0009] Construction power supply unit, the construction power supply unit is arranged on the bearing platform. The construction power supply unit is connected to the wind power generation module and the hydraulic power generation module, and the construction power supply unit is connected to construction power-consuming facilities through a power supply cable.

[0010] Beneficial effects

[0011] The wind power generation module in the power generation unit can generate electricity by using the wind energy at sea. The energy conversion sub-module in the hydraulic power generation module can generate electricity by using seawater, and the drainage sub-module can drain the seawater in the pipe pile. In this way, the hydraulic power generation module can achieve adjustable intermittent multiple power generation. The electric energy generated by the wind power generation module and the hydraulic power generation module is transmitted to the construction power supply unit, which is uniformly distributed by the construction power supply unit. During the normal operation stage of the offshore wind farm, the electric energy generated by the wind power generation module is supplied to relevant power-consuming facilities and the booster station, and then transmitted to the power grid. In this application, during the construction stage of the offshore wind farm, the electric energy generated by the wind power generation module and the hydraulic power generation module is supplied to tools, equipment, facilities, etc. that require electricity during the construction of the offshore wind farm, meeting the various temporary power consumption requirements during the construction process. Moreover, the energy conversion sub-module and its drainage sub-module make reasonable use of the internal space of the pipe pile and the bearing platform, and the construction of the construction power supply system has relatively little impact on the transformation of existing multi-pile steel bearing platform type offshore wind turbine foundations and electrical equipment. The hydraulic power generation module uses seawater for power generation, and the power generation process is clean and pollution-free. Moreover, seawater can be obtained locally, is relatively easy to obtain, and has a low cost.

[0012] In an alternative embodiment, the energy conversion sub-module includes: a hydraulic generator and a watertight platform. The watertight platform is arranged in the first pipe pile and is located below the water inlet. The watertight platform has a water pipe, and the hydraulic generator is arranged on the water pipe.

[0013] In an alternative embodiment, the energy conversion sub-module further includes: a control gate valve, and the control gate valve is arranged at the water outlet end of the water pipe.

[0014] Beneficial effects

[0015] After setting up the control gate valve, the opening and closing of the control gate valve can control the on-off of the water pipe, and further control whether the hydraulic generator generates electricity, making the hydraulic power generation process controllable. Moreover, by setting up the water isolation platform, a part of seawater can be pre-stored above the hydraulic generator to form a water head difference, which is beneficial to the start-up and operation of the hydraulic generator.

[0016] In an alternative embodiment, the energy conversion sub-module further includes: a first cavity and a second cavity. The first cavity is arranged in the first pipe pile and communicated with the first pipe pile, and the first cavity is located between the seabed surface and the hydraulic generator. The second cavity is arranged in the first pipe pile and communicated with the first pipe pile, and the second cavity is located below the hydraulic generator.

[0017] Beneficial effects

[0018] The first cavity can pre-store some seawater. In this way, when generating electricity, the first cavity cooperates with the water inlet to increase the power generation duration and power generation amount of the hydraulic generator. At the same time, in some cases where the power demand is large, it can avoid the water inlet flow rate being too small to meet the operation technical requirements of the hydraulic generator.

[0019] In an alternative embodiment, the pumping facility includes: a plurality of pumping members arranged at intervals along the height direction of the second pipe pile, and the construction power supply unit is electrically connected to the pumping members.

[0020] Beneficial effects

[0021] The pumping members at multiple different heights can work jointly to meet the head requirements, and the pumping efficiency is higher.

[0022] In an alternative embodiment, the drainage facility includes: a drainage pipe, the drainage pipe is connected to the pumping member, and one end of the drainage pipe extends out of the fan foundation unit.

[0023] Beneficial effects

[0024] When the construction power consumption load is low, the energy conversion sub-module does not work, and the seawater pumped out by the pumping member can be drained in time through the drainage pipe to ensure that when the energy conversion sub-module generates electricity next time, the seawater flowing through the hydraulic generator can be temporarily stored in the space below the water isolation platform.

[0025] In an alternative embodiment, the bottoms of the first pipe pile and the second pipe pile are provided with water isolation seals.

[0026] Beneficial effects

[0027] Setting a watertight bottom seal can prevent seawater from seeping into the inside of the pipe piles and occupying the internal space of the pipe piles. Moreover, the watertight bottom seal can also serve as a working platform, providing convenience for workers during construction and operation and maintenance.

[0028] In an alternative embodiment, the cap 13 is provided with an operation and maintenance passage entrance 1312 within the top range of the first pipe pile 11 and the second pipe pile 12.

[0029] Beneficial effects

[0030] By providing the operation and maintenance passage entrance, it enables the staff to enter the pipe piles from the cap. The operation and maintenance passage entrance also serves as a ventilation hole, which can adjust the air pressure inside the pipe piles when the hydraulic power generation module is working, ensuring the smooth operation of the hydraulic power generation module.

[0031] In an alternative embodiment, the construction power supply system based on the multi-pile steel cap type offshore wind turbine foundation further includes an operation and maintenance component provided on the first pipe pile and the second pipe pile. The operation and maintenance component includes: an operation and maintenance passage and an operation and maintenance platform, and the operation and maintenance passage and the operation and maintenance platform provided in the same pipe pile are connected.

[0032] Beneficial effects

[0033] By providing the operation and maintenance passage and the operation and maintenance platform, it is convenient for the staff to enter the pipe piles for some construction, operation and maintenance work.

[0034] In an alternative embodiment, the construction power supply system based on the multi-pile steel cap type offshore wind turbine foundation further includes auxiliary facilities provided on the wind turbine foundation unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0036] Figure 1 It is a schematic diagram of a construction power supply system based on a multi-pile steel cap type offshore wind turbine foundation according to an embodiment of the present invention.

[0037] Description of the reference numerals:

[0038] 11, the first pipe pile; 12, the second pipe pile; 13, the cap; 131, the cap tip; 1311, the hollow bottom plate of the tip; 1312, the operation and maintenance passage entrance; 132, the main platform; 14, the connecting pipe; 15, the watertight bottom seal; 16, the hollow mounting plate; 17, the seal.

[0039] 21. Wind power generation module, 221. Energy conversion sub-module, 2211. Water inlet, 2212. Hydraulic generator, 2213. Water separation platform, 2214. Water pipe, 2215. Control gate valve, 2216. First cavern, 2217. Second cavern, 2221. Pumping component, 2222. Drain pipe;

[0040] 3. Construction power supply unit, 31. Power supply cable, 32. Wind turbine generator set collector cable, 33. Hydroelectric generator set collector cable;

[0041] 41. Maintenance access passage, 42. Maintenance platform;

[0042] 51. Fender, 52. Ladder, 53. Rail;

[0043] 6. Seabed;

[0044] 7. Sea surface. Detailed implementation manners

[0045] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some but not all of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0046] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be construed as a limitation of the present invention. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0047] In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, the terms "installation", "connection", "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0048] In addition, the technical features involved in different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0049] The embodiments of the present invention will be described below in conjunction with Figure 1 Figure 1 An embodiment of the present invention provides a construction power supply system based on a multi-pile steel caisson type offshore wind turbine foundation. The construction power supply system includes a wind turbine foundation unit and a power generation unit. The wind turbine foundation unit includes: a first pipe pile 11, a second pipe pile 12, and a caisson 13. The bottoms of the first pipe pile 11 and the second pipe pile 12 are connected through a connecting pipe 14, and the caisson 13 is connected to the tops of the first pipe pile 11 and the second pipe pile 12. The power generation unit includes: a wind power generation module 21 and a hydraulic power generation module. The wind power generation module 21 is arranged on the caisson 13. The hydraulic power generation module includes: an energy conversion sub-module 221 and a drainage sub-module. An inlet 2211 is opened on the first pipe pile 11, and the inlet 2211 is located above the energy conversion sub-module 221. The energy conversion sub-module 221 is adapted to generate electricity using the seawater entering the first pipe pile 11 from the inlet 2211. The drainage sub-module is arranged on the second pipe pile 12. The drainage sub-module includes: a pumping facility and a drainage facility connected to each other, and one end of the drainage facility extends outside the wind turbine foundation unit. The pumping facility is used to pump the seawater in the second pipe pile 12 to the drainage facility, and the drainage facility is used to drain the seawater outside the wind turbine foundation unit. A construction power supply unit 3 is arranged on the caisson 13. The construction power supply unit 3 is connected to the wind power generation module 21 and the hydraulic power generation module, and the construction power supply unit 3 is connected to the electrical facilities through a power supply cable 31.

[0050] Specifically, in this embodiment, the wind turbine foundation unit adopts the caisson 13 and multiple pipe piles in the multi-pile steel caisson type offshore wind turbine foundation. Among them, the first pipe pile 11 for arranging the energy conversion sub-module 221 is called the first pipe pile 11, and the second pipe pile 12 for arranging the drainage sub-module is called the second pipe pile 12. The number of the first pipe pile 11 and the second pipe pile 12 can be one or more. The first pipe pile 11 and the second pipe pile 12 will be driven into the seabed 6 to provide stable support for the caisson 13. And the internal space of the pipe pile is large enough for the energy conversion sub-module 221 and the drainage sub-module to use.

[0051] In addition, to cooperate with the energy conversion sub-module 221 and the drainage sub-module to achieve controllable and intermittent power generation and simplify the equipment layout in each pipe pile, the bottoms of the first pipe pile 11 and the second pipe pile 12 are connected through a connecting pipe 14 to enable the flow of seawater between the pipe piles. Specifically, the connecting pipe 14 is buried in the seabed 6 and is arranged close to the bottoms of the first pipe pile 11 and the second pipe pile 12, so that the seawater in the first pipe pile 11 can be led to the second pipe pile 12, minimizing the seawater remaining in the first pipe pile 11. The connecting pipe 14 can be made of steel pipe or reinforced concrete pipe and can be constructed by pipe jacking or trenchless directional drilling. When setting the connecting pipe 14, the axial direction of the connecting pipe 14 can be horizontally arranged, or the connecting pipe 14 can be inclined downward at a certain angle towards the second pipe pile 12 to facilitate the guiding of seawater into the second pipe pile 12. By setting the connecting pipe 14 to connect the internal spaces between the two pipe piles, the energy conversion sub-module 221 and the drainage sub-module can be respectively arranged in different pipe piles, simplifying the equipment layout in each pile. The connecting pipe 14 also serves as an auxiliary for seawater accommodation, enhancing the power generation capacity and power generation duration of hydraulic power generation.

[0052] The connection method between the bearing platform 13 and the pipe pile is that the bearing platform socket 131 is inserted from the top of the pipe pile. Specifically, the bottom end of the bearing platform socket 131 is provided with a socket hollow bottom plate 1311, and hollow mounting plates 16 are provided at the tops of both the first pipe pile 11 and the second pipe pile 12. After the bearing platform socket 131 is inserted into the pipe pile, a seal 17 is arranged between the socket hollow bottom plate 1311 and the hollow mounting plate 16, and grouting is carried out between the socket hollow bottom plate 1311, the hollow mounting plate 16, and the seal 17 to connect the bearing platform 13 and the pipe pile together.

[0053] In the power generation unit, the wind power generation module 21 generates electricity using the wind energy at sea, and the hydraulic power generation module generates electricity using seawater. Among them, the wind power generation module 21 is arranged on the bearing platform 13, and the wind power generation module 21 can select a conventional offshore wind power generation unit.

[0054] The energy conversion sub-module 221 and the drainage sub-module in the hydropower generation module need to work in cooperation. Specifically, the water inlet 2211 is opened on the side wall of the first pipe pile 11, and a valve needs to be set at the water inlet 2211 to control the on / off of the water inlet 2211 and the flow rate of seawater. The water inlet 2211 is located between the energy conversion sub-module 221 and the sea surface 7. That is to say, the water inlet 2211 should be located below the sea surface 7 to facilitate direct access to seawater, and also above the hydraulic generator 2212 to enable the hydraulic generator 2212 to generate electricity using the potential energy and kinetic energy of seawater. When hydropower generation is required, the water inlet 2211 is opened, and seawater surges into the first pipe pile 11 from the water inlet 2211. The seawater drives the hydraulic generator 2212 to generate electricity. After the water level in the first pipe pile 11 rises to the hydraulic generator 2212, the power generation efficiency of the energy conversion sub-module 221 begins to decrease. Therefore, after each hydropower generation is completed, it is necessary to drain the seawater below the water separation platform 2213 in the first pipe pile 11 through the drainage sub-module to facilitate the next power generation of the hydraulic generator 2212. Since the energy conversion sub-module 221 has been set in the first pipe pile 11 and the space below the water separation platform 2213 is limited, the drainage sub-module is set in the second pipe pile 12, and the first pipe pile 11 and the second pipe pile 12 are connected by a connecting pipe 14 to enable the seawater in the first pipe pile 11 to flow into the second pipe pile 12. The pumping facility in the drainage sub-module can pump the seawater into the drainage facility, and the drainage facility discharges the seawater outside the fan foundation unit.

[0055] The construction power supply unit 3 is connected to the wind power generation module 21 through the wind turbine collector cable 32 and to the hydropower generation module 22 through the hydro turbine collector cable 33. Wind power generation and hydropower generation assist each other. Through the control and regulation of the construction power supply unit 3, stable electric energy is transmitted to meet the construction power consumption requirements and technical requirements. The construction power supply unit 3 is connected to the construction power consumption facilities through the power supply cable 31 to provide electric energy for the construction power consumption facilities. The electric energy generated by the wind power generation module 21 and the hydropower generation module 22 is all transmitted to the construction power supply unit 3, and is distributed by the construction power supply unit 3 to each construction power consumption facility. Specifically, the construction power supply unit 3 includes: a control device and a power transmission and transformation device connected to each other, and the control device preferably has an energy storage function. The control device is connected to the wind power generation module 21 and the hydropower generation module. That is to say, the wind power generation module 21 and the hydropower generation module transmit electric energy to the control device, and the control device then transmits the electric energy to the power transmission and transformation device. The power transmission and transformation device provides relatively stable electric energy to the construction power consumption facilities at other nearby working positions for their use.

[0056] This construction power supply system can apply and regulate wind power generation and hydropower generation during the construction stage of an offshore wind farm. It can provide relatively stable electric energy for welding, lighting, equipment commissioning, etc. In the early stage of the construction of the offshore wind turbine foundation, after the construction of the pipe piles and the pile cap 13 is completed, the wind power generation module 21 and the construction power supply unit 3 can be installed. Wind power generation provides electric energy for subsequent construction, including the construction of the hydropower generation module. Immediately afterwards, after the construction of the hydropower generation module is completed, wind power generation and hydropower generation can be used in combination to provide electric energy for subsequent construction. This construction power supply system solves the temporary construction power demand under the condition that shore power cannot be used during the conventional offshore construction stage of the offshore wind farm. Moreover, this construction power supply system is transformed based on the multi-pile steel pile cap type offshore wind turbine foundation, which does not occupy additional sea areas but reasonably utilizes the space inside the pipe piles. The structural modification and electrical equipment modification of the multi-pile steel pile cap type offshore wind turbine foundation are small, which is convenient for construction. Among them, the hydropower generation module uses seawater, which is the most easily obtained and cheapest in the ocean, for power generation. The entire power generation and power supply process is clean and pollution-free, and the cost is extremely low.

[0057] In one embodiment, a watertight bottom seal 15 is provided at the bottom ends of the first pipe pile 11 and the second pipe pile 12.

[0058] The bottom ends of the first pipe pile 11 and the second pipe pile 12 are both located on the seabed 6. After the soil inside the pipe piles is removed, the water in the soil of the seabed will seep out, and there is a possibility that seawater will seep into the pipe piles. A watertight bottom seal 15 is provided at the bottom ends of the first pipe pile 11 and the second pipe pile 12 to prevent seawater from seeping into the pipe piles and occupying the internal space of the pipe piles. Moreover, the watertight bottom seal 15 can also serve as a working platform for workers to construct and maintain, or can also be used as a support platform to arrange some equipment.

[0059] In one embodiment, the pile cap 13 is provided with an operation and maintenance passage entrance 1312 within the top range of the first pipe pile 11 and the second pipe pile 12. By providing the operation and maintenance passage entrance 1312, workers can enter the pipe piles from the pile cap 13. The operation and maintenance passage entrance 1312 also serves as a ventilation hole, which can adjust the air pressure inside the pipe piles when the hydropower generation module is working and ensure the smooth operation of the hydropower generation module.

[0060] In one embodiment, the energy conversion sub-module 221 includes: a hydro-generator 2212 and a watertight platform 2213. The watertight platform 2213 is arranged inside the first pipe pile 11 and is located below the water inlet 2211. The watertight platform 2213 is hermetically connected to the first pipe pile 11 to prevent seawater leakage. The watertight platform 2213 has a water pipe 2214, and the hydro-generator 2212 is arranged on the water pipe 2214. Arranging the hydro-generator 2212 on the water pipe 2214 can enable all seawater to flow through the hydro-generator 2212 from the water pipe 224, and the seawater drives the hydro-generator 2212 to generate electricity.

[0061] In one embodiment, the energy conversion sub-module 221 further includes: a control gate valve 2215, and the control gate valve 2215 is disposed at the water outlet end of the water pipe 2214.

[0062] The water pipe 2214 is provided with the control gate valve 2215, so that the on-off of the water outlet end of the water pipe 2214 can be controlled. Specifically, when the diameter of the water pipe is relatively small, the control gate valve 2215 can adopt a valve, and when the diameter of the water pipe is relatively large, the control gate valve 2215 can adopt a gate.

[0063] Setting the control gate valve 2215 can control whether the hydraulic generator 2212 can generate electricity. Even if seawater flows in from the water inlet 2211, after the control gate valve 2215 is closed, the hydraulic generator 2212 cannot continue to generate electricity. In this way, during the power generation stop stage, a part of seawater can be pre-stored above the water isolation platform 2213, and a water head difference is formed when power generation is required, which is beneficial to the start-up and operation of the hydraulic generator 2212.

[0064] In one embodiment, the pumping facility includes: a plurality of pumping members 2221 arranged at intervals along the height direction of the second pipe pile 12, and the construction power supply unit 3 is electrically connected to the pumping members 2221.

[0065] Specifically, a plurality of pumping members 2221 can be arranged at different heights inside the second pipe pile 12, and the pumping members 2221 are preferably water pumps. In this embodiment, a total of two water pumps are arranged, one of which is arranged on the water isolation bottom seal 15 at the bottom end of the second pipe pile 12, and the other is arranged at the operation and maintenance platform 42 above it, which is approximately at the same horizontal position as the hydraulic generator 2212. Starting the water pump can pump the water in the second pipe pile 12 away. Since the water pump needs to be driven by electricity, each water pump can be connected to the construction power supply unit 3, and the construction power supply unit 3 uses the electric energy of the wind power generation module 21 for power supply.

[0066] The combined use of a plurality of water pumps can meet the lift requirement and discharge the seawater smoothly outside the fan foundation assembly. Moreover, it can be powered by the construction power supply unit 3 without external power supply.

[0067] In one embodiment, the drainage facility includes: a drainage pipe 2222, the drainage pipe 2222 is connected to the water outlet of the pumping member 2221, and one end of the drainage pipe 2222 extends out of the second pipe pile 12.

[0068] Specifically, the drain pipe 2222 is arranged vertically and connected to each pumping component 2221 (i.e., the water pump). The other end extends upward through the hollow mounting plate 16 of the second pipe pile 12 and the tip hollow bottom plate 1311 of the pile cap tip 131, and finally exits through the operation and maintenance channel entrance 1312 of the pile cap 13. After the water pump pumps seawater into the drain pipe 2222, it can be discharged back into the ocean, and a valve can also be set at the water outlet of the drain pipe 2222.

[0069] After the drain pipe 2222 is set, the seawater can be transported from the bottom to the top of the second pipe pile 12, and the seawater used for power generation by the energy conversion sub-module 221 can be discharged, ensuring that there is enough space inside the first pipe pile 11 and the second pipe pile 12 to temporarily store the seawater flowing through the hydraulic generator 2212, which is convenient for the next power generation work of the energy conversion sub-module 221.

[0070] In one embodiment, the energy conversion sub-module 221 further includes: a first cave 2216 and a second cave 2217. The first cave 2216 is arranged in the first pipe pile 11 and communicates with the first pipe pile 11, and the first cave 2216 is located between the seabed 6 surface and the energy conversion sub-module 221. The second cave 2217 is arranged in the first pipe pile 11 and communicates with the first pipe pile 11, and the second cave 234 is located below the hydraulic power generation module 22. Generally, part of the seawater is retained inside the first cave 2216, but the second cave 2217 is generally in an emptied state.

[0071] When the seawater enters the first pipe pile 11 from the water inlet 2211 and the control gate valve 2215 is closed, the seawater can be retained in the first cave 2216. In this way, during the next hydraulic power generation, the first cave 2216 and the water inlet 2211 cooperate to increase the power generation duration and power generation amount of the hydraulic generator 2212. At the same time, when the power demand is relatively large and the flow rate of the water inlet 2211 is relatively small and cannot meet the operation technical requirements of the hydraulic generator, the seawater pre-stored in the first cave 2216 can play a buffering and regulating role.

[0072] In one embodiment, the construction power supply system further includes an operation and maintenance component arranged in the first pipe pile 11 and the second pipe pile 12. The operation and maintenance component includes: an operation and maintenance channel 41 and an operation and maintenance platform 42, and the operation and maintenance channel 41 and the operation and maintenance platform 42 arranged in the same pipe pile are connected.

[0073] The operation and maintenance channel 41 enables the staff to enter the pipe pile from the operation and maintenance channel entrance 1312 of the pile cap 13, and the staff can carry out relevant work when they reach the operation and maintenance platform 42. Since both the water isolation platform 2213 and the water isolation bottom seal 15 can serve as the operation and maintenance platform 42, in this embodiment, the operation and maintenance channel 41 is arranged in both the first pipe pile 11 and the second pipe pile 12, and only one operation and maintenance platform 42 is arranged in the second pipe pile 12 as the bearing platform of the pumping component 231.

[0074] In one embodiment, the construction power supply system further includes auxiliary facilities provided on the wind turbine foundation unit.

[0075] Specifically, the auxiliary facilities include: fender 51, ladder 52 and railing 53. The fender 51 is provided on the outer walls of the first pipe pile 11 and the second pipe pile 12 to facilitate the docking of ships. The ladder 52 is provided on the bearing platform 13 and the pipe piles. The railing 53 is provided on the main platform 132 of the bearing platform 13 to play a protective role.

[0076] The working process of the construction power supply system provided in this embodiment is described below:

[0077] The power generation process of the wind power generation module 21 is the same as that of a conventional offshore wind turbine using wind energy to generate electricity, which will not be elaborated here. The electric energy generated by the wind power generation module 21 is transmitted to the construction power supply unit 3 through the wind turbine collector cable 32.

[0078] The power generation process of the hydraulic power generation module is as follows:

[0079] Usually, open the water inlet 2211 to store some seawater in the space above the horizontal partition platform 2213 in the first pipe pile 11 and in the first cave 2216.

[0080] When hydraulic power generation is required, open the water inlet 2211 to allow seawater to enter the first pipe pile 11. The seawater drives the hydraulic generator 2212, and the hydraulic generator 2212 uses the kinetic energy and potential energy of the seawater to generate electricity, and transmits the electric energy to the construction power supply unit 3 through the hydraulic turbine collector cable 24. The construction power supply unit 3 delivers the electric energy to the electrical facilities at the construction site.

[0081] During hydraulic power generation, when the seawater falls from the hydraulic generator 2212 to the bottom of the first pipe pile 11, it will flow into the second pipe pile 12 through the connecting pipe 14. When the construction electricity load is low, the pumping member 2221 works to pump the seawater and transport it to the drain pipe 2222, and it is discharged outside the bearing platform 13 through the drain pipe 2222.

[0082] Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A construction power supply system based on a multi-pile steel cap type offshore wind turbine foundation, characterized in that: include: A wind turbine foundation unit, the wind turbine foundation unit comprising: a first pipe pile (11), a second pipe pile (12) and a cap (13), the bottoms of the first pipe pile (11) and the second pipe pile (12) being connected via a connecting pipe (14), and the cap (13) being connected to the tops of the first pipe pile (11) and the second pipe pile (12); A power generation unit, the power generation unit comprising: a wind power generation module (21) and a hydropower generation module, the wind power generation module (21) being arranged on the foundation (13), the hydropower generation module comprising: an energy conversion submodule (221) and a drainage submodule, the energy conversion submodule (221) being arranged in the first pipe pile (11), the first pipe pile (11) being provided with a water inlet (2211), and the water inlet (2211) being located above the energy conversion submodule (221), the energy conversion submodule (221) being suitable for generating electricity by using seawater entering the first pipe pile (11) from the water inlet (2211), the drainage submodule being arranged on the second pipe pile (12), comprising: a pumping facility and a drainage facility connected to each other, and one end of the drainage facility extending out of the outside of the wind turbine foundation unit, the pumping facility being used to pump the seawater in the second pipe pile (12) to the drainage facility, and the drainage facility being used to discharge the seawater to the outside of the wind turbine foundation unit; A construction power supply unit (3), the construction power supply unit (3) is arranged on the support platform (13), the construction power supply unit (3) is connected to the wind power generation module (21) and the hydropower generation module, and the construction power supply unit (3) is connected to construction power facilities at other nearby working locations through a power supply cable (31).

2. The construction power supply system based on multi-pile steel cap type offshore wind turbine foundation according to claim 1 is characterized in that: The energy conversion submodule (221) comprises: a hydroelectric generator (2212) and a water-blocking platform (2213); the water-blocking platform (2213) is arranged in the first pipe pile (11) and is located below the water inlet (2211); the water-blocking platform (2213) has a water pipe (2214); and the hydroelectric generator (2212) is arranged in the water pipe (2214).

3. The construction power supply system based on multi-pile steel cap type offshore wind turbine foundation according to claim 2 is characterized in that: The energy conversion submodule (221) further comprises: a control gate valve (2215), wherein the control gate valve (2215) is arranged at the water outlet end of the water pipe (2214).

4. The construction power supply system based on multi-pile steel cap type offshore wind turbine foundation according to claim 3 is characterized in that: The energy conversion submodule (221) further comprises: a first cavern (2216) and a second cavern (2217), wherein the first cavern (2216) is arranged on the first pipe pile (11) and is connected to the first pipe pile (11), and the first cavern (2216) is located between the surface of the seabed (6) and the hydroelectric generator (2212), and the second cavern (2217) is arranged on the first pipe pile (11) and is connected to the first pipe pile (11), and the second cavern (2217) is located below the hydroelectric generator (2212).

5. The construction power supply system based on multi-pile steel cap type offshore wind turbine foundation according to claim 1 is characterized in that: The water pumping facility comprises: a plurality of water pumping parts (2221) arranged at intervals along the height direction of the second pipe pile (12); the construction power supply unit (3) is electrically connected to the water pumping parts (2221).

6. The construction power supply system based on multi-pile steel cap type offshore wind turbine foundation according to claim 5 is characterized in that: The drainage facility comprises: a drainage pipe (2222), the drainage pipe (2222) is connected to the water pumping member (2221), and one end of the drainage pipe (2222) extends out of the fan base unit.

7. The construction power supply system based on multi-pile steel cap type offshore wind turbine foundation according to claim 1 is characterized in that: The bottom ends of the first pipe pile (11) and the second pipe pile (12) are provided with water-proof bottom seals (15).

8. The construction power supply system based on multi-pile steel cap type offshore wind turbine foundation according to claim 1 is characterized in that: The foundation (13) is provided with an operation and maintenance passage entrance (1312) within the top end range of the first pipe pile (11) and the second pipe pile (12).

9. The construction power supply system based on multi-pile steel cap type offshore wind turbine foundation according to claim 1 is characterized in that: It also includes an operation and maintenance component arranged on the first pipe pile (11) and the second pipe pile (12), the operation and maintenance component including: an operation and maintenance channel (41) and an operation and maintenance platform (42), and the operation and maintenance channel (41) and the operation and maintenance platform (42) arranged in the same pipe pile are connected.

10. The construction power supply system based on a multi-pile steel cap type offshore wind turbine foundation according to any one of claims 1 to 9, characterized in that: It also includes auxiliary facilities arranged on the wind turbine base unit.

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