Offshore renewable energy coupled very large scale hydrogen production platform system

Abstract

The application discloses a kind of offshore renewable energy coupling super-large hydrogen production platform systems, which uses hexagonal modular super-large bearing platform as bearing matrix, and realizes integrated layout through intercommunication corridor bridge through each module, and multiple-cavity damping suppresses sway load-bearing column and wave-damping auxiliary operation sub-platform to suppress platform sway;The system integrates offshore photovoltaic power generation unit, offshore wind power generation unit, high-altitude wind power generation integrated unit, wave energy capture and hydraulic power generation integrated unit to form photovoltaic, low-altitude wind power, high-altitude wind energy and wave energy four-energy coupling power supply architecture, and is matched with seawater electrolysis hydrogen production integrated unit, horizontal high-pressure hydrogen storage integrated unit and spherical atmospheric pressure hydrogen storage unit to realize hydrogen production, storage and transportation operation.The present application solves the problems of single energy, insufficient modularization, low efficiency of hydrogen production, storage and transportation of existing platform by biomimetic wave energy capture, hydraulic energy conversion, high-altitude wind energy magnetic gap adjustable power generation, seawater direct supply hydrogen production, high-low pressure grading storage and transportation.

Description

Technical Field

[0001] This invention relates to the fields of marine new energy development, wave power generation and offshore hydrogen production technology, and in particular to an ultra-large offshore renewable energy coupled hydrogen production platform system based on the four-energy coupling power supply of photovoltaic, low-altitude wind power, high-altitude wind power and wave power, and with functions such as biomimetic guiding wave energy capture, dual-cylinder collaborative hydraulic energy conversion, high-altitude wind power magnetic gap adjustable power generation, hexagonal modular assembly, direct seawater hydrogen production, and high and low pressure graded storage and transportation. Background Technology

[0002] Offshore hydrogen production technology is one of the core technologies for the large-scale development of marine new energy, the clean production of green hydrogen, and the supply of marine energy. It is widely used in the construction of offshore hydrogen energy bases, the consumption of marine renewable energy, the storage and transportation of hydrogen at sea, and the supporting energy supply for marine engineering. Traditional offshore hydrogen production platforms mostly adopt a single renewable energy source for power supply and are built with a fixed overall structure. They rely on land-based freshwater replenishment and a single hydrogen storage mode to achieve the electrolytic production and simple storage of hydrogen.

[0003] However, traditional offshore hydrogen production platforms have many technical limitations: First, their energy supply is singular and poorly coupled, resulting in extremely poor power supply stability. They rely solely on offshore wind or solar power generation, without incorporating high-altitude wind and wave energy for synergistic utilization. This leads to low energy efficiency and susceptibility to variations in sunlight, wind speed, and wave conditions, causing severe power fluctuations that result in frequent start-ups and shutdowns of the electrolysis hydrogen production system, low efficiency, and insufficient equipment utilization. Second, the platforms are rigid and lack modular assembly capabilities, making construction and maintenance extremely difficult. They are mostly monolithic fixed structures, making shore-based construction, offshore transportation, and hoisting operations complex. The lack of hexagonal modular design means that expansion is not possible as needed, and a single module failure can cause the entire platform to shut down, resulting in high maintenance costs and long downtime periods. Third, the supply of raw materials from the open ocean is highly limited, and the desalinated water for hydrogen production is entirely dependent on land. Transportation and resupply are hampered by long supply cycles, high costs, and significant impact from sea distances and severe sea conditions, making long-term continuous hydrogen production in the open ocean difficult and severely limiting operational scope and application scenarios. Fourth, the hydrogen energy storage and transportation system is singular and poorly integrated, employing only atmospheric or high-pressure hydrogen storage methods, resulting in small storage capacity and weak regulation capabilities. The hydrogen production, purification, compression, storage, and external transportation processes are fragmented, making leaks and pressure imbalances likely. The single external transportation method is insufficient to meet the demands of large-scale hydrogen energy transfer. Fifth, the platform exhibits poor marine adaptability and weak resistance to swaying. Lacking specialized damping and sway-suppressing structures, it experiences severe rolling and heaving under strong winds and waves in the open ocean, resulting in poor structural stability. Furthermore, insufficient anti-corrosion, waterproof, and salt spray protection designs make the equipment prone to corrosion and aging. In addition, the lack of comprehensive intelligent closed-loop monitoring weakens safety early warning capabilities and increases operational risks.

[0004] To alleviate the aforementioned problems, integrated and modular offshore hydrogen production technologies have gradually developed, with multi-energy complementary coupling hydrogen production platforms becoming a research hotspot. However, existing offshore hydrogen production platforms still have significant shortcomings: insufficient energy coupling depth, achieving only wind-solar complementarity, failing to form a four-energy coupling architecture of photovoltaic, low-altitude wind power, high-altitude wind energy, and wave energy, resulting in complete unutilized wave energy, low efficiency of high-altitude wind power generation, and power outages under weak wind and wave conditions; extremely low modularity, lacking hexagonal prefabricated assembly, independent maintenance, and rapid expansion designs, limiting the platform's adaptability due to its integrated structure; insufficient integration of seawater hydrogen production, with loose connections between pretreatment, desalination, and electrolysis, making it difficult to achieve full-process self-sufficiency; lack of tiered storage and transportation, lacking high- and low-pressure tiered hydrogen storage and a closed intelligent transmission and distribution system, resulting in insufficient storage and transportation efficiency and safety; weak anti-sway capability, lacking multi-level damping and sway suppression support, leading to poor stability in the open ocean; and imperfect intelligent control, unable to achieve adaptive regulation under all operating conditions, making it difficult to meet the needs of long-term stable hydrogen production projects in the open ocean.

[0005] Therefore, there is an urgent need to develop a super-large-scale hydrogen production platform system for marine renewable energy coupling, which features four-energy coupling power supply (photovoltaic, low-altitude wind power, high-altitude wind power, and wave energy), hexagonal modular assembly, multi-level damping for sway suppression, direct seawater supply, high and low voltage graded storage and transmission, adjustable magnetic gap for high-altitude wind energy, and biomimetic wave energy hydraulic conversion. This system would address the shortcomings of existing technologies and achieve multi-energy coupling power supply, modular assembly, sway suppression, direct seawater supply, graded storage and transmission, and full-domain intelligent monitoring, thereby promoting the iteration and large-scale application of marine green hydrogen technology. Summary of the Invention

[0006] Purpose of the Invention: Addressing the problems of existing offshore hydrogen production platforms, including single energy supply, lack of wave energy coupling, large power fluctuations, poor hydrogen production continuity, traditional monolithic platforms lacking modular assembly design leading to difficulties in construction, hoisting, expansion, and maintenance, lack of damping and sway suppression structures in the support system resulting in severe swaying and weak stability in the open ocean, low efficiency of high-altitude wind power generation and failure in weak wind conditions, reliance on land transportation for freshwater replenishment in offshore hydrogen production limiting the operational range, single hydrogen storage method without tiered storage and transportation, and poor hydrogen energy distribution integration, as well as weak adaptability to the marine environment and inadequate safety monitoring, this invention proposes an ultra-large offshore renewable energy coupled hydrogen production platform system. This system achieves seven major functions: four-energy coupled power supply (photovoltaic + low-altitude wind power + high-altitude wind power + wave energy), hexagonal modular assembly, multi-stage damping and sway suppression, direct seawater hydrogen production, high and low voltage tiered storage and transportation, adjustable high-altitude magnetic gap power generation, and biomimetic wave energy hydraulic conversion. This improves hydrogen production efficiency and platform stability, enhances long-term offshore operation capabilities, and ensures safe and efficient operation of the entire offshore hydrogen production process.

[0007] Technical Solution: This invention relates to an offshore renewable energy coupled ultra-large hydrogen production platform system, aiming to address the technical pain points of existing offshore hydrogen production platforms, such as single energy capture, weak wind and wave resistance, low modularity, and poor stability of hydrogen production, storage, and transportation. It achieves integrated operation of efficient utilization of offshore renewable energy and the entire hydrogen production process. The specific technical solution is as follows:

[0008] The platform system of this invention includes a carrying platform, an offshore photovoltaic power generation unit, a modular and detachable connecting corridor bridge, a seawater electrolysis hydrogen production integrated unit, an offshore operation and maintenance living cabin unit, a horizontal high-pressure hydrogen storage integrated unit, a semi-submersible multi-cavity damping and sway suppression load-bearing support column, a modular wave-dissipating and damping auxiliary operation sub-platform, a hydrogen transmission pipeline network between platforms, a ship hydrogen connection and transmission interface, a spherical atmospheric pressure hydrogen storage unit, an offshore wind power generation unit, a high-altitude wind power generation integrated unit, and a biomimetic wave energy capture and hydraulic power generation integrated unit. The various components work together to construct a four-energy coupled power supply system of photovoltaic + low-altitude wind power + high-altitude wind power + wave energy, realizing fully automated operation of four-energy coupled hydrogen production, modular assembly, multi-level damping and sway suppression, and graded storage and transportation, and is suitable for complex marine environments with high salt spray, strong winds and waves, and multiple working conditions in the open sea.

[0009] The hexagonal modular ultra-large load-bearing platform serves as the main load-bearing structure of the system. Made of corrosion-resistant alloy, it features a hexagonal mortise and tenon modular assembly design. Each functional module is independently prefabricated and produced in a standardized manner. At sea, it is assembled using mortise and tenon joints and quick-connect flanges, enabling rapid, weld-free assembly and flexible expansion. Each module can be independently disassembled and repaired, significantly reducing the difficulty of offshore construction and maintenance costs. The platform is functionally zoned, dividing the area into a power generation zone, a hydrogen production core zone, a hydrogen storage zone, and an operation and maintenance living area, with a rational layout that ensures no interference between the zones. The platform's bottom is rigidly welded to a semi-submersible multi-cavity damping and sway-suppressing load-bearing support column. This support column incorporates a vertical wave-dissipating damping cavity and an annular guide channel, efficiently dissipating waves. The system effectively reduces wave impact energy and wave transmission, thus minimizing platform sway. The lower end of the load-bearing support column is fixedly connected to a modular wave-damping auxiliary operating sub-platform. The sub-platform features a biomimetic drag-reducing skirt around its perimeter and wave-damping plates at its bottom. Together, they form a semi-submersible, multi-stage damping and sway-suppressing support system, significantly reducing the platform's roll, pitch, and heave amplitudes, ensuring stable operation under strong winds and waves in the open ocean. The modular, detachable connecting corridor is constructed with corrosion-resistant pipes and assembled using flanges and anti-loosening self-locking bolts. It connects all functional modules of the platform, with pre-reserved pipeline and personnel access channels inside, enabling centralized pipeline installation, safe personnel passage, and independent maintenance of each module. It is easy to assemble and disassemble and boasts excellent sealing performance.

[0010] The seawater electrolysis hydrogen production integrated unit is the core hydrogen production module of the system, realizing direct seawater supply for hydrogen production and closed-loop control throughout the entire process. It includes a marine raw water pretreatment and purification system, a reverse osmosis seawater desalination system, a multi-stage hydrogen pressurization and compression system, a deep hydrogen purification system, a core water electrolysis hydrogen production system, and an energy storage and power distribution system. The marine raw water pretreatment and purification system's inlet is directly connected to seawater and has built-in multi-stage precision filters and sedimentation tanks, which can efficiently remove suspended impurities, plankton, silt, and other heavy impurities from seawater, completing the initial seawater purification. The outlet is sealed and connected to the reverse osmosis seawater desalination system, which uses high-pressure reverse osmosis membrane technology (operating pressure 0.8-1.2MPa) to convert pretreated seawater into high-purity electrolytic-grade freshwater (conductivity ≤10μS / cm), achieving efficient conversion of seawater into hydrogen production feedstock. The reverse osmosis seawater desalination system's outlet is sealed and connected to the core water electrolysis hydrogen production system, providing clean raw materials for the electrolysis reaction. The core water electrolysis hydrogen production system employs a high-efficiency electrolyzer structure, using high-purity fresh water as raw material. After being powered on, it completes the electrolysis reaction to generate crude hydrogen. The outlet of the core water electrolysis hydrogen production system is sequentially connected to a deep hydrogen purification and enhancement system and a multi-stage hydrogen pressurization and compression system. The deep hydrogen purification and enhancement system removes impurities such as moisture and oxygen from the crude hydrogen, increasing its purity to over 99.999%. The multi-stage hydrogen pressurization and compression system progressively pressurizes the purified hydrogen to 15-20 MPa, meeting high-pressure hydrogen storage standards. The energy storage and power distribution system is connected to all power generation units on the platform, possessing functions such as voltage stabilization, frequency regulation, and peak shaving and valley filling, matching hydrogen production load demands in real time, and providing continuous and stable power supply for the entire hydrogen production process.

[0011] The seawater electrolysis hydrogen production integrated unit is equipped with a comprehensive hydrogen production unit pressure monitoring system, a closed-loop hydrogen production process pipeline system, an offshore electrochemical energy storage battery, a multi-parameter monitoring integrated sensor device, a process section hydrogen buffer storage tank, a desalination water buffer storage tank, and a hydrogen online purity detection and analysis system, further enhancing the stability, safety, and controllability of the hydrogen production system. The closed-loop hydrogen production process pipeline system uses double-sealed corrosion-resistant pipes, running through the entire process of seawater purification, desalination, electrolysis, purification, and compression. The pipe joints use high-pressure sealed connectors to prevent media leakage and are suitable for high-salt-spray corrosion conditions in the ocean. The desalination water buffer storage tank and the process section hydrogen buffer storage tank are used for storage... The system stores desalinated fresh water and crude hydrogen to stabilize water and gas supply, eliminate fluctuations in medium flow and pressure, and ensure the stability of the hydrogen production process. A comprehensive pressure monitoring system, multi-parameter integrated sensor devices, and an online hydrogen purity detection and analysis system work together to collect key parameters such as pressure, temperature, flow rate, and hydrogen purity throughout the entire hydrogen production process in real time. This data is synchronously fed back to the platform's central control system for immediate anomaly warnings. An offshore electrochemical energy storage battery stores the electrical energy generated by the four-energy coupled power supply system. When short-term power fluctuations occur, the battery releases the energy immediately to smooth out these fluctuations, assist in stabilizing the power supply, ensure continuous operation of the hydrogen production system, and prevent process disruptions due to power outages.

[0012] The high-altitude wind power generation integrated unit is a high-efficiency high-altitude wind energy capture and conversion module, including a high-altitude wind energy capture aerodynamic airfoil assembly, airfoil support frame, high-altitude energy conversion chamber, transmission bearing, and power generation and energy storage unit. The high-altitude wind energy capture aerodynamic airfoil assembly adopts a biomimetic streamlined airfoil design, consisting of a biomimetic arc-shaped main wing, wing root reinforcing flange, airfoil guide ribs, and anti-salt spray sealing end caps. The large chord length arc-shaped streamlined shape increases the windward area and reduces wind resistance, efficiently capturing high-altitude laminar wind energy. The airfoil guide ribs strengthen structural rigidity and optimize wind field guidance, while the anti-salt spray sealing end caps adopt a labyrinth sealing structure to block salt spray corrosion and extend the assembly's service life. The airfoil support frame... It adopts a hollow, high-strength drive shaft with excellent rigid transmission performance. It is connected to the high-altitude energy conversion chamber through a transmission bearing, driving the rotor inside the high-altitude energy conversion chamber to rotate coaxially. The transmission has no sliding friction and extremely low power loss. The high-altitude energy conversion chamber has a built-in magnetic gap adjustable power generation structure, which consists of a permanent magnet rotor, adjustable stator winding, and elastic magnetic gap adjustment shims. It adaptively adjusts the magnetic gap according to the high-altitude wind speed. When the wind is weak, the magnetic gap is reduced to improve power generation efficiency. When the wind is strong, the magnetic gap is increased to protect the winding and rotor, realizing high-altitude magnetic gap adjustable power generation. It outputs stable DC power to the power generation and storage unit and the platform's main power distribution system, realizing efficient capture, adaptive conversion, and stable energy storage of high-altitude wind energy.

[0013] The offshore maintenance living quarters provide a safe and comfortable living space for maintenance personnel, while also possessing independent power supply capabilities. The hull is constructed with high-strength, corrosion-resistant, and heat-insulating materials, making it suitable for harsh offshore environments. The roof of the living quarters integrates vertical axis low-noise wind energy harvesting blades and rooftop photovoltaic modules. The rooftop photovoltaic modules are fully covered in unobstructed areas of the roof to maximize the capture of solar energy from the sea surface. The vertical axis low-noise wind energy harvesting blades are installed in low-wind-resistance positions at the corners of the roof, resulting in low operating noise, suitable for the working environment of maintenance personnel. The two work together to generate electricity, forming an independent microgrid on the roof, providing independent power supply for maintenance monitoring equipment and living facilities within the living quarters, without consuming the platform's main energy system, ensuring continuous maintenance operations.

[0014] The seawater electrolysis hydrogen production integrated unit is equipped with vertical axis high-efficiency wind energy capture blades and a vertical axis direct-drive generator, serving as an auxiliary power supply unit for the hydrogen production system and improving power supply redundancy. The vertical axis high-efficiency wind energy capture blades adopt a low-start wind speed biomimetic airfoil design, starting to capture wind even in weak winds, adapting to the local wind field of the platform. They are coaxially and directly connected to the vertical axis direct-drive generator, with no transmission loss and high power generation efficiency. The generated electricity is directly connected to the power supply system of the seawater electrolysis hydrogen production integrated unit, providing auxiliary power supply to the hydrogen production module. When the main power supply system fails, it serves as an emergency backup power source, improving the power supply stability and emergency response capability of the hydrogen production system.

[0015] A horizontal high-pressure hydrogen storage integrated unit and a spherical atmospheric pressure hydrogen storage unit work together to form a high- and low-pressure staged hydrogen storage system. The horizontal high-pressure hydrogen storage integrated unit is used for high-pressure hydrogen storage and includes a safety pressure relief and venting pipeline, a high-pressure hydrogen sealed storage tank, and tank safety monitoring and control components. The high-pressure hydrogen sealed storage tank is integrally forged from a high-strength pressure-resistant alloy, has a horizontal structure, is resistant to high pressure, fatigue, and corrosion, and is suitable for offshore marine environments. The safety pressure relief and venting pipeline is vertically arranged at the top of the tank and has a built-in pressure-triggered pressure relief valve. When the pressure inside the tank exceeds the set threshold (21MPa), the pressure relief mechanism automatically opens to eliminate potential safety hazards. The tank safety monitoring and control components integrate high-precision pressure and temperature sensors and emergency shut-off valves to monitor the hydrogen pressure and temperature inside the tank in real time. The data is fed back to the central control system to achieve dynamic early warning and automatic protection. The inlet and outlet of the high-pressure hydrogen sealed storage chamber are respectively connected to the hydrogen multi-stage pressurization and compression system and the hydrogen transmission pipeline network between platforms through high-pressure sealing joints, so as to achieve high-pressure stable input, safe storage and accurate output of hydrogen.

[0016] The biomimetic wave energy capture and hydraulic power generation integrated unit is a high-efficiency wave energy utilization module, including a biomimetic wave energy capture component, a swing support mechanism, a dual-cylinder collaborative intelligent hydraulic energy conversion system, and a modular anti-overturning intelligent base assembly. The biomimetic wave energy capture component adopts a biomimetic arc-shaped curved surface wave capture structure to achieve weak wave convergence and strong wave diversion. The electrically adjustable edge guide wing component automatically adjusts the opening and closing angle according to the wave direction and wave height to adapt to multi-wave direction wave capture. The swing support mechanism achieves seamless rigid transmission of wave mechanical energy. The dual-cylinder collaborative intelligent hydraulic energy conversion system converts reciprocating mechanical energy into stable hydraulic energy, and then into electrical energy. The modular anti-overturning intelligent base assembly can adjust the center of gravity and provide early warning of overturning risks, ensuring efficient and stable capture and conversion of wave energy, and supplementing the platform's power supply system with clean electricity.

[0017] The platform is equipped with intelligent monitoring components throughout its entire scope, constructing a closed-loop monitoring system for the entire process. Each power generation, hydrogen production, hydrogen storage, and transmission and distribution unit is equipped with dedicated sensing and monitoring equipment. All monitoring signals are uniformly connected to the platform's central control system, which enables real-time data acquisition, analysis, control, and anomaly warning. It can also remotely control the operating status of each unit, reducing maintenance workload. All load-bearing components of the platform are treated with a special anti-corrosion coating, and pipelines and joints adopt a sealed and anti-loosening structure. Key components adopt seawater self-lubricating and anti-salt spray sealing designs, comprehensively improving the system's resistance to corrosion, fatigue, and wind and waves. It is suitable for marine conditions with high salt spray, strong winds and waves, and high humidity in the open sea, ensuring long-term stable operation of the system.

[0018] Working Principle: This invention employs a collaborative working mechanism integrating multi-energy complementary power supply, direct seawater hydrogen production, purification and compression energy storage, tiered storage and transportation, intelligent monitoring, and safety protection. Combined with a modular platform structure and intelligent closed-loop control, the coordinated operation of various functional units enables the efficient capture and conversion of marine renewable energy, as well as the fully automated production, purification, and storage of hydrogen. The working principle is as follows:

[0019] First, after the overall platform is towed to the predetermined operation sea area in the open sea, anchor chain fixing is carried out through the semi-submersible multi-cavity damping anti-sloshing load-bearing support columns and the modular wave-eliminating damping auxiliary operation sub-platform. By utilizing the vertical wave-eliminating damping cavities and annular flow guide grooves built in the load-bearing support columns, as well as the bionic drag-reducing skirt and bottom wave-eliminating plate of the sub-platform, a multi-stage damping anti-sloshing system is constructed to dissipate wave impact energy and weaken platform sloshing, so as to realize stable positioning of the platform under the working condition of strong wind and waves in the open sea; meanwhile, the master control system is powered on and started, completes self-inspection of each unit of the whole platform, and focuses on detecting equipment integrity, pipeline sealing, sensing sensitivity and electrical connection reliability of the power generation, hydrogen production, hydrogen storage and transmission and distribution systems, so as to ensure that each unit has the conditions for cooperative operation. After passing the self-inspection, the offshore photovoltaic power generation unit, the 5MW offshore wind power generation unit, the high-altitude wind energy power generation integration unit, and the bionic flow-guiding wave energy capture and hydraulic power generation integration unit are started synchronously. Among them, the high-altitude wind energy capture aerodynamic wing surface assembly deploys the bionic arc-shaped main wing, which uses the bionic streamlined airfoil to increase the windward area and reduce wind resistance, efficiently capture high-altitude laminar wind energy, drive the permanent magnet rotor in the high-altitude energy conversion bin to rotate through the wing surface support framework and transmission bearings, and combined with the adjustable magnetic gap design (gap shrinking for efficiency improvement in weak wind, gap expanding for equipment protection in strong wind), realizes adaptive conversion of high-altitude wind energy; the bionic flow-guiding wave energy capture assembly gathers weak waves and diverts strong waves through the bionic arc-shaped oscillating plate, the electric adjustable edge flow guide wing assembly automatically adjusts the angle according to wave direction and wave height to adapt to wave energy capture from multiple wave directions, and then converts the reciprocating mechanical energy of waves into high-pressure hydraulic energy through the double-cylinder cooperative hydraulic conversion system, and then converts it into electric energy; meanwhile, the vertical-axis low-noise wind energy capture blade assembly and the roof photovoltaic assembly on the top of the offshore operation and maintenance accommodation cabin unit, as well as the small vertical-axis high-efficiency wind energy capture blade and the vertical-axis direct-drive power generation motor matched with the hydrogen production unit, are started synchronously. After the renewable energy captured by all power generation units is converted into electric energy, it is initially voltage-stabilized by respective energy storage units (power generation energy storage units, special offshore electrochemical energy storage batteries), and then converges into the energy storage and power distribution system uniformly. Through the functions of voltage stabilization, frequency regulation, and peak shaving and valley filling of the system, the power supply grid connection of the whole platform is completed, a stable four-energy coupling power supply system is formed, waiting for the hydrogen production operation instruction.

[0020] Secondly, after the central control system issues the hydrogen production command, the marine raw water pretreatment and purification system is activated. Seawater is drawn from the sea area through the inlet pipe, and suspended impurities and plankton are filtered out using built-in multi-stage precision filters (pore size ≤5μm). Then, heavy impurities such as silt are settled in the sedimentation tank, completing the initial purification of the seawater and preventing impurities from clogging subsequent pipelines and equipment. The pretreated seawater is then sent to the reverse osmosis seawater desalination system through sealed pipelines. Under high pressure of 0.8-1.2MPa, the seawater passes through the reverse osmosis membrane to remove seawater salt and trace impurities, converting it into a solution with a conductivity ≤10μS / cm. Electrolytic-grade high-purity freshwater is used to efficiently convert seawater into hydrogen production feedstock. The desalinated high-purity freshwater is stored in a desalination buffer storage tank, where the water level and pressure are monitored in real time using a built-in pressure sensor. It is then stably transported to the core hydrogen production system via a closed pipeline system (double-sealed anti-corrosion design to prevent leakage). Multi-parameter monitoring integrated sensor devices in the pipeline monitor the freshwater flow rate and purity in real time, ensuring that the hydrogen production feedstock meets the electrolysis requirements. This provides a continuous, clean, and stable supply of feedstock for the hydrogen production reaction, realizing the core principle of direct seawater supply for hydrogen production.

[0021] Subsequently, the energy storage and power distribution system precisely regulates the incoming power according to the load demand of hydrogen electrolysis, providing a stable DC power supply to the core system of water electrolysis for hydrogen production. The core system of water electrolysis for hydrogen production uses high-purity fresh water as raw material. In the electrolyzer, water molecules are decomposed into hydrogen and oxygen through an electrochemical electrolysis reaction to generate crude hydrogen with a purity of ≥99.2%. The crude hydrogen is sent to the hydrogen buffer storage tank in the process section through pipelines. Through the pressure stabilization effect of the tank, fluctuations in hydrogen flow and pressure are eliminated, providing a stable gas source for subsequent purification and compression processes. During this process, the hydrogen production unit's full-domain pressure monitoring system and multi-parameter monitoring integrated sensor device collect key parameters such as pressure, temperature, and flow rate in real time. The data is synchronously fed back to the central control system. The central control system automatically adjusts the electrolysis current and fresh water supply to ensure the stable operation of the hydrogen production process and realize intelligent closed-loop control of the hydrogen production process.

[0022] After hydrogen production, the crude hydrogen gas sequentially enters the deep purification system and the multi-stage pressurization system. The deep purification system removes impurities such as moisture and oxygen from the crude hydrogen gas through adsorption and filtration processes, increasing the hydrogen purity to over 99.999%, meeting the purity requirements for subsequent hydrogen storage and distribution. The multi-stage pressurization system pressurizes the purified hydrogen to the high-pressure hydrogen storage standard of 15-20 MPa through a step-by-step pressurization process. Simultaneously, the online hydrogen purity detection and analysis system monitors the hydrogen purity in real time. If the purity is found to be substandard, the unqualified gas is returned to the purification system for reprocessing through a return pipeline to ensure that the output hydrogen meets the standards. The qualified high-pressure hydrogen gas is distributed through the inter-platform hydrogen transmission pipeline network to the horizontal high-pressure hydrogen storage integrated unit and the spherical atmospheric pressure hydrogen storage unit, respectively, to achieve high and low pressure graded storage. The core principle is to balance hydrogen storage capacity and safety risks by using hydrogen storage units with different pressure levels according to hydrogen export requirements and safe storage standards, thereby improving the flexibility and safety of hydrogen storage.

[0023] During hydrogen storage, the safety monitoring and control components of the horizontal high-pressure hydrogen storage integrated unit monitor the hydrogen status inside the tank in real time through high-precision pressure and temperature sensors. When the pressure inside the tank exceeds the set threshold, the safety pressure relief and exhaust pipe at the top of the tank automatically opens to release excess pressure quickly and eliminate safety hazards. The entire hydrogen storage and distribution process adopts a closed design, with high-pressure sealed joints at the pipeline interfaces. Combined with the double-sealed structure of the closed transmission pipeline system for the hydrogen production process, hydrogen leakage is prevented, ensuring operational safety. When the platform needs to export hydrogen, the central control system adjusts the pressure matching between the hydrogen storage unit and the ship hydrogen connection and transmission interface according to the export demand, controls the opening of the emergency shut-off valve, completes the closed docking with the hydrogen transport ship, and smoothly transports hydrogen to the transport ship through the hydrogen transmission pipeline network between the platforms, realizing the safe loading, unloading, and distribution of hydrogen energy at sea. Its core principle is to ensure the stability and safety of the hydrogen export process through pressure matching, closed docking, and flow control.

[0024] This invention, through the organic combination of multi-energy synergistic capture, direct seawater hydrogen production, intelligent closed-loop control, and tiered safe storage and transportation, fully leverages the synergistic advantages of each functional unit, solving the technical pain points of low utilization efficiency of offshore renewable energy, poor hydrogen production stability, weak wind and wave resistance, and high safety risks, and realizing fully automated, efficient, and safe operation of offshore renewable energy coupled hydrogen production.

[0025] Beneficial effects: Compared with the prior art, the present invention has the following beneficial effects:

[0026] (1) Multi-energy complementary power supply, improving both the stability and efficiency of hydrogen production: Existing offshore hydrogen production systems mostly rely on single wind or photovoltaic power supply, which is significantly affected by natural conditions such as weather and wind speed, resulting in large power supply fluctuations, frequent start-ups and shutdowns of the electrolytic hydrogen production system, low hydrogen production efficiency, and insufficient equipment utilization. This invention integrates four renewable energy capture units: offshore flexible photovoltaic power generation, 5MW offshore low-altitude wind power, high-altitude wind power generation, and biomimetic guided wave energy power generation, combined with offshore dedicated electrochemical energy storage batteries and energy storage and distribution systems, to construct a four-energy coupled power supply system. This system can achieve smooth grid connection of multiple power sources, voltage and frequency regulation, and peak shaving and valley filling, effectively suppressing the fluctuations in renewable energy power supply, ensuring a continuous and stable power supply for the electrolytic hydrogen production system, and avoiding the disruption of the hydrogen production process caused by power outages or fluctuations; at the same time, the efficient capture of high-altitude wind energy and the supplementary utilization of wave energy significantly improve the utilization rate of renewable energy. Compared with a single power supply mode, the hydrogen production efficiency is improved, the equipment utilization rate is improved, and the hydrogen production energy consumption and operating costs are significantly reduced.

[0027] (2) Hexagonal modular design significantly optimizes platform adaptability, maintainability, and economy: Traditional offshore hydrogen production platforms are mostly integral fixed structures, which have drawbacks such as long construction cycles, difficult transportation and hoisting, inconvenient expansion in the later stage, and the need for overall shutdown for maintenance, resulting in poor flexibility in adapting to offshore operation scenarios. This invention adopts a hexagonal modular ultra-large load-bearing platform, coupled with modular detachable connecting corridors. Each functional unit (hydrogen production, hydrogen storage, power generation, and operation and maintenance) is designed as an independent standardized module, which is prefabricated in a shore-based factory and quickly assembled at sea through tenon and mortise positioning and quick-installation flanges. The construction cycle is shortened to less than 6 months, which greatly reduces the difficulty and cost of offshore construction. The platform can flexibly add or remove functional modules according to the hydrogen production capacity requirements, realize on-demand expansion, and adapt to different scales of hydrogen energy production scenarios. At the same time, the modular design supports independent disassembly and maintenance of single modules without shutting down the entire platform, shortening downtime for operation and maintenance, greatly reducing operation and maintenance costs, and improving the long-term continuity and economy of the platform. In addition, the hexagonal structure distributes stress evenly, and with the multi-level damping and sway-suppressing support system, it has improved wind and wave resistance compared to traditional rectangular platforms, making it more suitable for strong wind and wave conditions in the open sea.

[0028] (3) Direct seawater supply for hydrogen production, achieving 100% self-sufficiency in raw materials and significantly enhancing offshore operation capabilities: Existing offshore hydrogen production systems mostly rely on land-transported freshwater or dedicated freshwater tanks for raw material replenishment. During offshore operations, freshwater transportation costs are high, replenishment cycles are long, and operational scope is limited by transportation conditions, making long-term offshore hydrogen production impossible. This invention integrates an offshore raw water pretreatment and purification system with a reverse osmosis seawater desalination system. It directly extracts seawater from the sea area, and after multi-stage filtration, sedimentation, and reverse osmosis treatment, converts it into electrolytic-grade high-purity freshwater with a conductivity ≤10μS / cm, fully meeting the raw material requirements for electrolytic hydrogen production. This achieves self-sufficiency in hydrogen production raw materials, eliminating the need for external freshwater replenishment. This not only completely solves the raw material replenishment problem for offshore hydrogen production and significantly reduces freshwater transportation costs, but also breaks the operational scope limitations, enabling long-term continuous offshore hydrogen production operations and significantly enhancing the platform's offshore adaptability and practical application value.

[0029] (4) Integrated storage and transportation of hydrogen in a graded manner, ensuring safe, efficient, and flexible hydrogen storage and transportation: Traditional offshore hydrogen production platforms mostly adopt a single-pressure hydrogen storage method, which has problems such as limited hydrogen storage capacity, difficulty in pressure control, and poor connection between storage and transportation. In addition, hydrogen leakage and overpressure safety hazards are prone to occur, making it difficult to adapt to diverse hydrogen transportation needs. This invention innovatively adopts a high-low pressure graded hydrogen storage system using a horizontal high-pressure hydrogen storage integrated unit and a spherical atmospheric pressure hydrogen storage unit. The high-pressure unit is used for long-term large-capacity storage, while the atmospheric pressure unit is used for temporary buffering and emergency supply. This not only improves the hydrogen storage capacity but also achieves flexible control of hydrogen storage pressure, balancing the safety and practicality of hydrogen storage. Simultaneously, it is equipped with a fully enclosed hydrogen production process pipeline and a hydrogen transportation network between platforms, enabling fully enclosed transportation of hydrogen from production, purification, compression to storage and external transmission. Combined with a safety pressure relief and exhaust pipeline and a tank safety monitoring system, it can effectively eliminate the safety hazards of hydrogen leakage and overpressure. The ship hydrogen docking and transmission interface supports sealed docking with hydrogen transport vessels, realizing multiple external transmission methods such as pipeline transportation and ship docking. It is suitable for different hydrogen energy application scenarios such as land-based receiving terminals and offshore operation platforms, greatly improving the safety, efficiency and flexibility of hydrogen energy storage and transportation.

[0030] (5) Full-process intelligent monitoring and multiple protections greatly improve the adaptability to marine environment and operational safety: Existing offshore hydrogen production platforms mostly lack a full-domain intelligent monitoring system and have imperfect protection design. Under harsh working conditions such as high salt spray, strong winds and waves and high humidity in the open sea, they are prone to problems such as equipment corrosion, sensor failure and structural shaking, resulting in high equipment failure rate and prominent safety risks. This invention integrates a full-domain pressure monitoring system for hydrogen production units, a multi-parameter monitoring integrated sensor device, an online hydrogen purity detection and analysis system, and a fire early warning unit to construct a closed-loop intelligent monitoring system for the entire process. It collects key parameters such as pressure, temperature, flow rate, and purity in real time at each stage of power generation, hydrogen production, hydrogen storage, and distribution, enabling immediate early warning and automatic protection in case of abnormal situations (such as emergency valve shut-off, automatic pressure relief, and fire alarm activation), significantly reducing safety risks. Simultaneously, the platform employs semi-submersible multi-cavity damping and sway-suppressing support columns and modular wave-damping auxiliary operating sub-platforms to dissipate wave impact energy, reducing the platform's roll and pitch amplitude and ensuring stable operation under strong winds and waves. All load-bearing components and pipelines use specialized anti-corrosion coatings and sealing anti-loosening structures. Key components feature anti-salt spray seals and seawater self-lubricating designs to resist salt spray corrosion and marine environmental erosion, reducing equipment failure rates, extending platform service life, and significantly improving the system's adaptability to the marine environment and long-term operational stability.

[0031] (6) Green and low-carbon, with significant energy-saving and emission-reduction benefits: This invention relies entirely on renewable energy for power supply, without consuming fossil energy. The hydrogen production process only produces hydrogen and oxygen, with no greenhouse gas emissions or pollutants, which is in line with the concept of green and low-carbon development. At the same time, direct seawater supply for hydrogen production does not require the consumption of precious freshwater resources, realizing the efficient and clean utilization of marine resources. The synergistic effect of the multi-energy complementary power supply system and the intelligent power distribution system further improves energy utilization efficiency. Compared with the traditional fossil energy hydrogen production mode, it can reduce carbon emissions and has significant energy-saving and emission-reduction benefits and environmental protection value. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of the overall structure of the offshore renewable energy coupled ultra-large hydrogen production platform system of the present invention;

[0033] Figure 2 A schematic diagram of the integrated unit structure for seawater electrolysis hydrogen production;

[0034] Figure 3 Schematic diagram of the monitoring and auxiliary system for the hydrogen production unit;

[0035] Figure 4 This is a schematic diagram of the integrated unit structure for high-altitude wind power generation;

[0036] Figure 5 A schematic diagram of the structure of the wind-solar hybrid power generation unit mounted on the roof of the maintenance living quarters;

[0037] Figure 6 A schematic diagram of a vertical axis wind power generation device assisted by a hydrogen production unit.

[0038] Figure 7 A schematic diagram of a horizontal high-pressure hydrogen storage integrated unit.

[0039] Figure 8 A schematic diagram of the overall process flow of an offshore hydrogen production platform system;

[0040] Figure 9 A schematic diagram of the front three-dimensional structure of a biomimetic wave energy capture and hydraulic power generation device;

[0041] Figure 10 A schematic diagram of the rear three-dimensional structure of a biomimetic wave energy capture and hydraulic power generation device;

[0042] Figure 11 A schematic diagram of the structure of a single module of an ultra-large hydrogen production platform coupled with offshore renewable energy. Detailed Implementation

[0043] Figures 1 to 11The system includes: 1. Offshore photovoltaic power generation unit; 2. Modular detachable connecting corridor bridge; 3. Seawater electrolysis hydrogen production integrated unit; 4. Offshore operation and maintenance living quarters unit; 5. Horizontal high-pressure hydrogen storage integrated unit; 6. Semi-submersible load-bearing support column; 7. Modular auxiliary operation sub-platform; 8. Inter-platform hydrogen transmission pipeline network; 9. Ship hydrogen connection and transmission interface; 10. Spherical atmospheric pressure hydrogen storage unit; 11. Hexagonal modular ultra-large load-bearing platform; 12. 5MW offshore wind power generation unit; 13. High-altitude wind power generation integrated unit; 14. Bionic wave energy capture and hydraulic power generation integrated unit; 15. Offshore raw water pretreatment and purification system; 36. Reverse osmosis seawater desalination system; 37. Hydrogen multi-stage pressurization and compression system; 38. Hydrogen deep purification and refining system; 39. Electrolysis water hydrogen production core system; 30. Energy storage and power distribution system; 31. Hydrogen production unit full-area pressure monitoring system; 32. Hydrogen production process closed transmission pipeline system; 33. Offshore dedicated electrochemical energy storage battery; 34. Multi-parameter monitoring integrated sensor system. 3-10, Hydrogen buffer storage tank for process section; 3-11, Desalination water buffer storage tank; 3-12, Hydrogen online purity detection and analysis system; 3-13, High-altitude wind energy capture aerodynamic wing assembly; 13-1, Bionic arc-shaped main wing; 13-1-1, Wing root reinforcing flange; 13-1-2, Wing guide rib; 13-1-3, Salt spray resistant sealing end cap; 13-1-4, Wing support frame; 13-2, High-altitude energy conversion chamber; 13-3, Permanent magnet rotor; 13-3-1, Adjustable stator winding; 13-3-2, Elastic magnetic gap adjustment shim; 13-3-3. Double-layer sealed chamber 13-3-4, high-frequency power rectifier module 13-3-5, transmission bearing 13-4, power generation and energy storage unit 13-5, vertical axis low-noise wind energy capture blade assembly 4-1, roof photovoltaic module 4-2, small vertical axis high-efficiency wind energy capture blade 3-14, vertical axis direct drive generator 3-15, safety pressure relief and exhaust pipe 5-1, high-pressure hydrogen sealed storage chamber 5-2, tank safety monitoring and control assembly 5-3, high-rigidity integrated U-shaped swing arm 14-1, rigid flange of swing plate and swing arm 14-2, biomimetic flow guide Wave-capturing pendulum 14-3, electrically adjustable edge guide vane assembly 14-4, monitoring module in hydraulic circuit 14-5, high-pressure flexible hydraulic pipeline assembly 14-6, attitude and force sensing unit 14-7, adjustable swing limit and position feedback assembly 14-8, auxiliary balancing hydraulic cylinder assembly 14-9, modular base main frame 14-10, double-end self-lubricating hinge shaft assembly 14-11, swing arm force sensing pin assembly 14-12, main drive hydraulic cylinder assembly 14-13, dual-cylinder cooperative hinge support assembly 14-14.

[0044] like Figures 1 to 11As shown in this embodiment, the marine renewable energy coupled ultra-large hydrogen production platform system of the present invention includes a hexagonal modular ultra-large load-bearing platform 11, a marine photovoltaic power generation unit 1, a modular detachable connecting corridor bridge 2, a seawater electrolysis hydrogen production integrated unit 3, a marine operation and maintenance living cabin unit 4, a horizontal high-pressure hydrogen storage integrated unit 5, a semi-submersible load-bearing support column 6, a modular auxiliary operation sub-platform 7, a hydrogen transmission pipeline network between platforms 8, a ship hydrogen connection and transmission interface 9, a spherical atmospheric pressure hydrogen storage unit 10, a 5MW marine wind power generation unit 12, a high-altitude wind power generation integrated unit 13, and a biomimetic wave energy capture and hydraulic power generation integrated unit 14. The functional units work together to construct a four-energy coupled power supply system of photovoltaic + low-altitude wind power + high-altitude wind power + wave energy, realizing the integrated operation of marine renewable energy coupled hydrogen production, hydrogen storage, transmission and distribution throughout the entire process.

[0045] like Figure 1 As shown, the hexagonal modular super-large load-bearing platform 11 is the main load-bearing body of the system. It is formed by modular assembly of anti-corrosion alloy hexagonal panels. The bottom of the platform is rigidly fixed to the semi-submersible multi-cavity damping and sway-suppressing support column 6. The lower end of the semi-submersible multi-cavity damping and sway-suppressing support column 6 is fixedly connected to the modular wave-damping auxiliary operation sub-platform 7, forming a semi-submersible multi-level damping and sway-suppressing floating support structure, which can dissipate wave impact and suppress platform swaying. It is stably fixed to the predetermined operation area in the open sea by anchor chains.

[0046] The offshore photovoltaic power generation unit 1 is fully covered on the unobstructed area of ​​the top of the hexagonal modular super-large load-bearing platform 11, efficiently capturing solar energy from the sea surface; the 5MW offshore wind power generation unit 12 is arrayed at the edge of the platform, adapting to stable wind energy from the sea surface; the high-altitude wind power generation integrated unit 13 is installed in the high-position area of ​​the center of the platform, capturing high-altitude laminar wind energy; the biomimetic wave energy capture and hydraulic power generation integrated unit 14 is fixed in the wave-facing area at the bottom of the platform, efficiently capturing reciprocating wave energy; the four work together to construct a four-energy coupled power supply system of photovoltaic + low-altitude wind power + high-altitude wind power + wave energy. Modular and detachable connecting corridor 2 connects all functional modules of the platform, enabling personnel passage, pipeline laying, and independent maintenance; seawater electrolysis hydrogen production integrated unit 3 is located in the central functional area of ​​the platform and is the core hydrogen production module; marine operation and maintenance living cabin unit 4 is located in the safe area of ​​the platform, providing working and living space for operation and maintenance personnel; horizontal high-pressure hydrogen storage integrated unit 5 and spherical atmospheric pressure hydrogen storage unit 10 are located in separate areas in the platform's hydrogen storage area, forming a high- and low-pressure graded hydrogen storage structure; inter-platform hydrogen transmission pipeline network 8 is laid along the connecting corridor, connecting the hydrogen production and storage units; ship hydrogen connection and transmission interface 9 is fixed on the side of the platform for sealed marine external transmission of hydrogen.

[0047] The modular and detachable connecting corridor bridge 2 adopts quick-install flange and anti-loosening self-locking bolt assembly. The platform pipelines and joints adopt a labyrinth seal combined with a double-lip seal ring double sealing structure. The platform load-bearing and support components all adopt a damping and anti-sway structure design. All components are suitable for high salt spray, strong wind and waves, and large swaying and vibration conditions in the open sea.

[0048] like Figure 2 As shown, the seawater electrolysis hydrogen production integrated unit 3 is the core hydrogen production module of the system, realizing direct seawater supply for hydrogen production. It includes a marine raw water pretreatment and purification system 3-1, a reverse osmosis seawater desalination system 3-2, a multi-stage hydrogen pressurization and compression system 3-3, a deep hydrogen purification system 3-4, a core water electrolysis hydrogen production system 3-5, and an energy storage and power distribution system 3-6; the marine raw water pretreatment and purification system 3-1... The inlet is directly connected to the sea area, where impurities and plankton are removed through multi-stage filters and sedimentation structures to complete the initial purification of seawater. The outlet is sealed and connected to the reverse osmosis seawater desalination system 3-2. The reverse osmosis seawater desalination system 3-2 uses high-pressure reverse osmosis membrane technology to convert pretreated seawater into high-purity electrolytic-grade freshwater, achieving efficient conversion of seawater into hydrogen production feedstock. The outlet of the reverse osmosis seawater desalination system 3-2 is sealed and connected to the core electrolysis hydrogen production system 3-5 to provide high-purity feedstock for the electrolysis reaction. The core electrolysis hydrogen production system 3-5 is powered to electrolyze freshwater to generate crude hydrogen. The gas outlet is sequentially connected to the hydrogen deep purification and enhancement system 3-4 and the hydrogen multi-stage pressurization and compression system 3-3 to remove impurities and progressively pressurize to the standard hydrogen storage pressure. The energy storage and power distribution system 3-6 is connected to the four-energy coupling power supply unit to achieve voltage stabilization, peak shaving and valley filling, providing a stable power guarantee for the entire hydrogen production process.

[0049] like Figure 3 As shown, the seawater electrolysis hydrogen production integrated unit 3 is equipped with a comprehensive monitoring and energy storage voltage stabilization component to achieve closed-loop control of the entire hydrogen production process. This includes a comprehensive pressure monitoring system for the hydrogen production unit 3-7, a closed-loop hydrogen production process pipeline system 3-8, a marine-specific electrochemical energy storage battery 3-9, a multi-parameter monitoring integrated sensor device 3-10, a process section hydrogen buffer storage tank 3-11, a desalination water buffer storage tank 3-12, and a hydrogen online purity detection and analysis system 3-13. The closed-loop hydrogen production process pipeline system 3-8 uses double-sealed anti-corrosion pipes, running through the entire process of seawater purification, desalination, electrolysis, purification, and compression, preventing media leakage and adapting to marine corrosive conditions. The desalination water buffer storage tank 3-12 and the process section hydrogen buffer storage tank 3-11... Separate pressure-stabilized water supply and hydrogen transmission eliminate fluctuations in medium flow rate; the hydrogen production unit's full-area pressure monitoring system 3-7, multi-parameter monitoring integrated sensor device 3-10, and hydrogen online purity detection and analysis system 3-13 collect pressure, temperature, flow rate, and purity parameters in real time, and provide immediate early warning of anomalies; the marine-specific electrochemical energy storage battery 3-9 stores surplus electrical energy coupled with four energy sources, smooths out short-term power supply fluctuations, and ensures the continuous and stable operation of the hydrogen production system.

[0050] like Figure 4 As shown, the high-altitude wind power generation integrated unit 13 includes a high-altitude wind energy capture aerodynamic wing assembly 13-1, a wing support frame 13-2, a high-altitude energy conversion chamber 13-3, a transmission bearing 13-4, and a power generation and energy storage unit 13-5. To clearly demonstrate the precision assembly and transmission structure inside this unit, the internal assembly area of ​​the high-altitude energy conversion chamber 13-3 is shown in a proportionally enlarged cross-section, intuitively presenting the precise positional relationships of the coaxial connections, inner and outer nesting, and interlayer padding of each component. The high-altitude wind energy capture aerodynamic wing assembly 13-1 is a biomimetic streamlined wind-catching structure, consisting of a biomimetic arc-shaped main wing 13-1-1, a wing root reinforcing flange 13-1-2, a wing guide rib 13-1-3, and an anti-salt spray sealing end cap 13-1-4. Composition: The biomimetic arc-shaped main wing 13-1-1 adopts a streamlined arc shape with a large chord length. Multiple sets of airfoil guide ribs 13-1-3 are uniformly welded on the inner side to enhance structural rigidity and optimize the guidance of the high-altitude laminar flow field. The root of the biomimetic arc-shaped main wing is integrally formed with a root reinforcement flange 13-1-2, which is rigidly connected to the airfoil support frame 13-2 by anti-loosening bolts. The two ends of the main wing are fastened with anti-salt spray sealing end caps 13-1-4, which use a labyrinth sealing structure to block salt spray corrosion, achieving biomimetic arc-shaped airflow guidance and high strength. The high-altitude wind energy capture aerodynamic wing component 13-1 is rigidly welded to the top of the wing support frame 13-2 via the wing root reinforcing flange 13-1-2. The wing support frame 13-2 is a hollow high-strength drive shaft, and its bottom end is coaxially rotatably connected to the high-altitude energy conversion chamber 13-3 via the drive bearing 13-4. It rotates under the drive of high-altitude wind energy, and synchronously drives the permanent magnet rotor inside the high-altitude energy conversion chamber 13-3 to rotate uniformly and coaxially. The transmission has no sliding friction and extremely low power loss.

[0051] The high-altitude energy conversion chamber 13-3 is an adjustable magnetic gap power generation structure, consisting of a permanent magnet rotor 13-3-1, an adjustable stator winding 13-3-2, elastic magnetic gap adjustment shims 13-3-3, a double-layer sealed chamber body 13-3-4, and a high-frequency power rectification module 13-3-5. A partially enlarged cross-sectional view clearly shows that the center of the permanent magnet rotor 13-3-1 and the bottom of the wing support frame 13-2 are rigidly connected by a coaxial interference fit structure, with no relative rotation between them, rotating synchronously and coaxially with the wing support frame 13-2. The adjustable stator winding 13-3-2 is arranged in a ring structure, coaxially nested on the outer circumference of the permanent magnet rotor 13-3-1, with a uniform annular magnetic gap reserved between the rotor and stator, forming an inner rotor and outer stator configuration. The system features a power generation structure; an elastic magnetic gap adjustment shim 13-3-3 is an integrally ring-shaped pad and clamped and fixed between the outer ring of the adjustable stator winding 13-3-2 and the inner wall of the double-layer sealed chamber 13-3-4, finely adjusting the magnetic gap between the stator and rotor according to the working conditions; a high-frequency power rectifier module 13-3-5 is electrically connected to the stator winding; during energy conversion, the permanent magnet rotor 13-3-1 rotates and cuts the magnetic field lines to generate alternating current, which is rectified and converted into direct current output; the system achieves efficiency improvement by narrowing the gap in weak winds and protection of the machine by widening the gap in strong winds, completing adaptive power generation with adjustable magnetic gap; the power output end of the high-altitude energy conversion chamber 13-3 is connected to the power generation and storage unit 13-5 and the platform's main power distribution system, completing efficient capture, adaptive conversion, and stable energy storage of high-altitude wind energy.

[0052] like Figure 5 As shown, the top of the offshore maintenance living quarters unit 4 integrates a vertical axis low-noise wind energy harvesting blade assembly 4-1 and a rooftop photovoltaic assembly 4-2. The rooftop photovoltaic assembly 4-2 is fully covered in the unobstructed area of ​​the roof to maximize the capture of solar energy; the vertical axis low-noise wind energy harvesting blade assembly 4-1 is arranged in a low-wind-resistance position at the corner of the roof, with low operating noise and suitable for the working environment of maintenance personnel; the two work together to generate electricity, forming an independent microgrid on the roof, providing all-weather independent power supply for the offshore maintenance living quarters unit 4, achieving energy self-sufficiency of the cabin, without occupying the platform's main energy system, and ensuring stable power supply for maintenance personnel and equipment.

[0053] like Figure 6 As shown, the seawater electrolysis hydrogen production integrated unit 3 is equipped with a vertical axis high-efficiency wind energy capture blade 3-14 and a vertical axis direct-drive generator 3-15. The small vertical axis high-efficiency wind energy capture blade 3-14 adopts a low-start wind speed biomimetic airfoil design, which can start capturing wind even in weak winds, and is suitable for the local wind field of the platform. It is coaxially and directly connected to the vertical axis direct-drive generator 3-15, with no transmission loss and high power generation efficiency. The electrical energy is directly connected to the hydrogen production unit power distribution system as an auxiliary backup power source, realizing power supply redundancy of the hydrogen production system and improving power supply stability and emergency support capabilities.

[0054] like Figure 7As shown, the horizontal high-pressure hydrogen storage integrated unit 5 is the core hydrogen storage device at the high-pressure end. Together with the spherical atmospheric pressure hydrogen storage unit, it forms a high- and low-pressure staged hydrogen storage system, including a safety pressure relief and exhaust pipe 5-1, a high-pressure hydrogen sealed storage chamber 5-2, and a tank safety monitoring and control component 5-3. The high-pressure hydrogen sealed storage chamber 5-2 adopts a pressure-resistant alloy horizontal tank structure, which is resistant to high pressure, fatigue-resistant, and suitable for marine corrosive environments. The safety pressure relief and exhaust pipe 5-1 is vertically arranged at the top of the tank, automatically releasing pressure in case of overpressure to eliminate safety hazards. The tank safety monitoring and control component 5-3 integrates high-precision pressure and temperature sensors and an emergency shut-off valve, which monitors the hydrogen storage status in real time, provides dynamic early warning, and automatic protection. The inlet and outlet of the high-pressure hydrogen sealed storage chamber 5-2 are respectively sealed and connected to the hydrogen multi-stage pressurization and compression system 3-3 and the hydrogen transmission pipeline network 8 between platforms, realizing stable input, safe storage, and accurate output of high-pressure hydrogen.

[0055] The horizontal high-pressure hydrogen storage integrated unit 5 and the spherical atmospheric pressure hydrogen storage unit 10 form a high-low pressure graded storage and transportation structure. The hydrogen transportation pipeline network 8 between platforms is sealed and connected to the ship hydrogen connection and transmission interface 9 to realize the closed-loop transportation of hydrogen and the connection with the ship at sea, thus forming an integrated closed-loop system of hydrogen production, purification, compression, storage and transportation.

[0056] like Figure 8As shown, the system of this invention relies on a four-energy coupled power supply architecture of photovoltaic + low-altitude wind power + high-altitude wind power + wave energy to realize fully automated hydrogen production and intelligent transmission and distribution. The process flow is as follows: offshore renewable energy (composed of offshore photovoltaic power generation unit 1, 5MW offshore wind power generation unit 12, high-altitude wind power generation integrated unit 13, and biomimetic guiding wave energy capture and hydraulic power generation integrated unit 14). The system outputs electrical energy (through collaborative supply) and integrates it into the energy storage and distribution system 3-6. After regulating the fluctuating power supply through voltage stabilization, frequency modulation, and peak shaving, the system provides continuous and stable power to the seawater pretreatment system (marine raw water pretreatment and purification system 3-1), the seawater desalination system (reverse osmosis seawater desalination system 3-2), and the electrolysis hydrogen production system (electrolysis water hydrogen production core system 3-5), ensuring continuous operation of the entire hydrogen production process. Seawater is pretreated and desalinated to be converted into high-purity freshwater, which is then sent to the electrolysis water hydrogen production core system 3-5 for electrolysis to generate primary hydrogen. The primary hydrogen is then sequentially purified by the hydrogen deep purification system 3-4 to remove impurities and pressurized by the multi-stage hydrogen pressurization and compression system 3-3 to generate high-pressure high-purity hydrogen. The high-pressure high-purity hydrogen is then sent to the horizontal high-pressure hydrogen storage integrated unit 5 and the spherical atmospheric pressure hydrogen storage unit 5. The high and low pressure graded hydrogen storage device, consisting of storage unit 10, completes safe graded storage; the inter-platform hydrogen transmission pipeline network 8 and the ship hydrogen connection and transmission interface 9 constitute a closed intelligent transmission and distribution system, which delivers hydrogen to hydrogen transport ships or land receiving terminals as needed via pipeline or ship connection; the mooring and positioning system (semi-submersible multi-cavity damping and sway-suppressing support column 6 and modular wave-dissipating damping auxiliary operation sub-platform 7) provides support and multi-level damping and sway suppression to ensure stable operation of the platform in the open sea; the full-domain intelligent monitoring system (including the full-domain pressure monitoring system of hydrogen production unit 3-7, multi-parameter monitoring integrated sensor device 3-10 and supporting fire early warning unit) provides real-time closed-loop monitoring of the entire process of power generation, hydrogen production, hydrogen storage, transmission and distribution, and platform attitude, and provides automatic early warning and protection against abnormalities to ensure the safe, efficient and stable operation of the system.

[0057] like Figures 9 to 11As shown, the biomimetic wave energy capture and hydraulic power generation integrated unit 14 includes a biomimetic wave energy capture component, a swing support mechanism, a dual-cylinder collaborative intelligent hydraulic energy conversion system, and a modular anti-overturning intelligent base assembly. The biomimetic wave energy capture component consists of a biomimetic wave energy capture swing plate 14-3, an electrically adjustable edge guide wing assembly 14-4, and a rigid flange 14-2 for the swing plate and swing arm. The biomimetic wave energy capture swing plate 14-3 is a biomimetic arc-shaped curved wave capture structure, made of wear-resistant and corrosion-resistant alloy integral forging, with an arc-shaped streamlined shape on the plate surface and an arc-shaped guide groove on the inner side to achieve weak wave convergence and strong wave diversion. The rigid flange 14-2 for the swing plate and swing arm is a thickened forged integral structure, with one end connected to the biomimetic wave energy capture component. The wave-capturing pendulum 14-3 is welded and fixed at one end, and the other end is rigidly locked to the high-rigidity integrated U-shaped pendulum frame 14-1 via circumferential anti-loosening bolts, ensuring zero force transmission gaps and zero-loss wave energy transfer. The electrically adjustable edge guide vane assembly 14-4 consists of a waterproof servo drive module, an arc-shaped adjustable vane, and high-strength waterproof hinge components. It is symmetrically hinged to both sides of the biomimetic wave-capturing pendulum 14-3 and automatically adjusts the opening and closing angle according to the wave direction and wave height to achieve multi-wave adaptive guidance. The swing support mechanism consists of the high-rigidity integrated U-shaped pendulum frame 14-1, the double-end self-lubricating hinge shaft assembly 14-11, the pendulum force sensing pin assembly 14-12, and the adjustable swing limit and position feedback assembly 14-8. The high-rigidity integrated U-shaped pendulum frame 14-14-15 is further supported by the high-rigidity integrated U-shaped pendulum frame 14-14-15-16-17-18-17-18-19 ... The 14-1 swing arm is a corrosion-resistant, integrally forged box-type structure made of alloy, with no welded joints and high bending rigidity. Its upper end is rigidly connected to the biomimetic wave energy capture swing plate 14-3 via a rigid flange, while its lower end is hinged to the modular base frame 14-10 via a double-end self-lubricating hinge shaft assembly 14-11, precisely transmitting wave reciprocating mechanical energy. The double-end self-lubricating hinge shaft assembly 14-11 consists of a high-strength pin, a seawater self-lubricating alloy bushing, and a labyrinth seal end cap, suitable for long-term seawater immersion, achieving low-resistance reciprocating oscillation and maintenance-free operation. The swing arm force-sensing pin assembly 14-12 incorporates a high-precision stress sensing module, embedded in the middle of the hinge shaft. Real-time acquisition of shear force and tensile force data of the swing arm is fed back to the intelligent control system to realize real-time stress warning; the adjustable swing limit and position feedback component 14-8 consists of an elastic buffer damping block and a high-precision displacement sensor, which is symmetrically fixed on both sides of the modular base main frame 14-10, adaptively limiting the maximum swing angle of the swing arm and buffering impact loads to realize stroke closed-loop control; the dual-cylinder cooperative intelligent hydraulic energy conversion system consists of the main drive hydraulic cylinder assembly 14-13, the auxiliary balance hydraulic cylinder assembly 14-9, the dual-cylinder cooperative hinged support assembly 14-14, the high-pressure flexible hydraulic pipeline assembly 14-6, and the monitoring module 14-5 in the hydraulic circuit.The main drive hydraulic cylinder assembly 14-13 is a large-diameter, wear-resistant hydraulic structure with a chrome-plated cylinder barrel for corrosion protection and a high-strength, wear-resistant piston rod. One end is hinged to a high-rigidity integrated U-shaped support assembly 14-14 via a double-cylinder collaborative hinge support component. The swing arm 14-1 is hinged at one end to the modular base main frame 14-10, converting reciprocating mechanical energy into high-pressure hydraulic energy. The auxiliary balancing hydraulic cylinder assembly 14-9 and the main drive hydraulic cylinder assembly 14-13 are symmetrically arranged, featuring a small-diameter buffer structure. Both ends are hinged via a dual-cylinder collaborative hinge support assembly 14-14, offsetting lateral load and providing weak-wave collaborative pressurization, achieving efficient dual-cylinder collaborative conversion. The dual-cylinder collaborative hinge support assembly 14-14 is a universal hinge structure, adaptively adjusting the hydraulic cylinder hinge angle to eliminate swing-induced eccentric load stress. The high-pressure flexible hydraulic pipeline assembly 14-6 uses seawater-resistant flexible composite pipe, with a built-in leakage sensing unit, connecting the main and auxiliary hydraulic cylinders to the hydraulic power generation module, adapting to reciprocating swing and providing real-time leak prevention. The monitoring module 14-5 in the hydraulic circuit integrates pressure, flow, and temperature sensors, connected in series inside the pipeline, for real-time monitoring of hydraulic conditions and coordinated control. Modular anti-tilt... The intelligent base assembly consists of a modular base main frame 14-10 and an attitude and force sensing unit 14-7. The modular base main frame 14-10 is a corrosion-resistant alloy modular welded frame with an adjustable counterweight module inside. It is fastened to the bottom of the hexagonal modular ultra-large load-bearing platform 11 by anti-loosening bolts, enabling quick assembly and disassembly and adjustable center of gravity. The attitude and force sensing unit 14-7 consists of a high-precision tilt sensor and a pressure sensing module, which are embedded in the four corners of the base to collect the base tilt angle and force distribution in real time, feeding back to the intelligent system and providing early warning of overturning risks. The biomimetic wave energy capture and hydraulic power generation integrated unit 14, through biomimetic curved surface wave capture, rigid gapless force transmission, dual-cylinder collaborative hydraulic conversion, and the collaborative work of the modular intelligent base, completes the efficient capture of wave energy, precise transmission of mechanical energy, hydraulic energy conversion, and electrical energy output, providing the platform with clean and stable wave energy power and realizing efficient wave energy utilization under all working conditions.

[0058] The platform's intelligent monitoring components are connected to the four-energy coupled power supply unit, hydrogen production unit, storage and transportation unit, and sway suppression support system in both signal and circuit configurations. This enables closed-loop control of the entire process, including energy supply, hydrogen production process, hydrogen storage status, hydrogen energy transmission and distribution, platform attitude, and sway suppression. The platform can dynamically adjust operating parameters and protection measures based on power generation, hydrogen production load, and sea conditions.

[0059] The working process of the offshore renewable energy coupled ultra-large hydrogen production platform system of this invention is as follows:

[0060] Step 1): Towing the whole platform to the predetermined operating sea area in the open sea, carrying out anchor chain fixation by means of the semi-submersible multi-cavity damping anti-sway load-bearing support columns 6 and the modular wave-eliminating damping auxiliary operating sub-platform 7, adjusting the anchor chain tension to realize the horizontal positioning of the platform, so as to ensure that the platform does not sway under the impact of waves; powering on and starting the master control system, completing the self-inspection of the whole device, focusing on detecting the operating status of each power generation unit, hydrogen production module, hydrogen storage device and monitoring system, and checking the pipeline sealing performance, sensor sensitivity and electrical connection reliability; after passing the self-inspection, the offshore photovoltaic power generation unit 1, the 5MW offshore wind power generation unit 12, the high-altitude wind power generation integrated unit 13, and the bionic diversion wave energy capture and hydraulic power generation integrated unit 14 are started synchronously, wherein the aerodynamic airfoil assembly for high-altitude wind energy capture 13-1 unfolds the bionic arc main wing, and the electric adjustable edge diversion wing assembly 14-4 resets to the initial diversion angle, so as to adapt to the initial wind field and wave field. Meanwhile, the vertical-axis low-noise wind energy capture blade assembly 4-1 and the roof-top photovoltaic module 4-2 on the top of the offshore operation and maintenance accommodation unit 4, as well as the vertical-axis high-efficiency wind energy capture blade 3-14 and the vertical-axis direct-drive power generation motor 3-15 supporting the offshore electrolysis hydrogen production integrated unit 3 are started synchronously. All power generation units capture renewable energy and convert it into electric energy. After initial voltage stabilization by respective energy storage units (power generation energy storage unit 13-5, offshore electrochemical energy storage battery 3-9), the electric energy is collectively汇入 the energy storage and power distribution system 3-6, completing the grid connection for power supply of the whole platform, and the system enters the standby state, waiting for the hydrogen production operation instruction.

[0061] Step 2): The master control system issues a hydrogen production operation instruction, and the offshore raw water pretreatment and purification system 3-1 is started. Seawater is extracted through the water inlet pipe, filtered through a multi-stage precision filter screen (aperture ≤ 5μm) to remove suspended impurities and plankton, and then settled in a sedimentation tank to remove heavy impurities such as silt, thus completing rough purification of seawater; the pretreated seawater is sent to the reverse osmosis seawater desalination system 3-2 through a sealed pipeline, passes through the reverse osmosis membrane under high pressure, removes salt and trace impurities from seawater, and is converted into high-purity electrolysis-grade fresh water; the desalinated high-purity fresh water is stored in the desalinated fresh water buffer storage tank 3-12, the built-in pressure sensor in the tank monitors the water level and pressure in real time, and the fresh water is stably transported to the core system for water electrolysis hydrogen production 3-5 through the closed pipeline system for hydrogen production process 3-8. The multi-parameter monitoring integrated sensor device 3-10 in the pipeline monitors the flow rate and purity of fresh water in real time, so as to ensure that the hydrogen production raw materials meet the electrolysis requirements and provide stable and clean raw material supply for hydrogen production operation.

[0062] Step 3): The energy storage and power distribution system 3-6 regulates the incoming power supply by stabilizing voltage, adjusting frequency, and peak shaving according to the hydrogen production load demand, providing a stable DC power supply to the core water electrolysis hydrogen production system 3-5. The core water electrolysis hydrogen production system 3-5 uses high-purity fresh water as raw material to complete the electrolysis reaction in the electrolyzer, generating crude hydrogen (purity ≥99.2%). The crude hydrogen is sent to the process section hydrogen buffer storage tank 3-11 through pipelines to achieve pressure stabilization and buffering, eliminating fluctuations in hydrogen flow and pressure. The hydrogen production unit's overall pressure monitoring system 3-7 and the multi-parameter monitoring integrated sensor device 3-10 monitor the pressure (control range 0.1-0.3MPa) and temperature (control range 25-40℃) during the hydrogen production process in real time. The flow rate parameter and the online hydrogen purity detection and analysis system 3-13 monitor the purity of crude hydrogen in real time. All parameters are fed back to the central control system, which automatically adjusts the electrolysis current and fresh water supply to ensure the stable operation of the hydrogen production process. The crude hydrogen is then passed through the deep hydrogen purification system 3-4 (removing moisture and oxygen impurities, increasing the purity to over 99.999%) and the multi-stage hydrogen pressurization and compression system 3-3 (gradually increasing the pressure to 15-20 MPa) to meet the high-pressure hydrogen storage standard requirements. During this process, if there is a short-term fluctuation in the four-energy coupling power supply, the marine electrochemical energy storage battery 3-9 will immediately release excess power to smooth out the power supply fluctuations, ensure the continuous operation of the hydrogen production system, and avoid the disruption of the hydrogen production process due to power outages.

[0063] Step 4): The pressurized and purified high-pressure high-purity hydrogen is diverted through the inter-platform hydrogen transmission pipeline network 8 and delivered to the horizontal high-pressure hydrogen storage integrated unit 5 and the spherical atmospheric pressure hydrogen storage unit 10 respectively, completing the high- and low-pressure staged storage. The tank safety monitoring and control component 5-3 monitors the pressure and temperature of the hydrogen storage tank in real time. When the pressure exceeds the set threshold, the safety pressure relief and exhaust pipeline 5-1 automatically opens to relieve pressure and eliminate safety hazards. When transporting hydrogen externally, the main control system activates the ship hydrogen docking and transmission interface 9, adjusts the interface pressure to match the hydrogen storage tank pressure, completes the sealed docking with the hydrogen transport ship, and smoothly delivers hydrogen to the transport ship through pipelines, while monitoring the sealing of the docking point in real time. To ensure hydrogen purity and prevent leaks, the entire hydrogen production, storage, and distribution process is monitored in a closed loop by a comprehensive intelligent monitoring system (including a comprehensive pressure monitoring system for the hydrogen production unit 3-7, a multi-parameter monitoring integrated sensor device 3-10, and a supporting fire alarm unit). If abnormal pressure, substandard purity, or leaks occur, the system immediately activates an alarm, simultaneously closes the emergency shut-off valves of relevant pipelines, and activates the fire protection unit to ensure the platform's safe and stable operation. Maintenance personnel can view the system's operating status in real time through the monitoring terminal in the offshore maintenance living quarters unit 4, and complete daily inspections and troubleshooting. The independent microgrid in the cabin continuously supplies power to the maintenance equipment and living quarters without consuming the platform's main energy source.

Claims

1. A marine renewable energy coupled ultra-large hydrogen production platform system, characterized in that: It includes a carrying platform (11), an offshore photovoltaic power generation unit (1), an offshore wind power generation unit (12), an high-altitude wind power generation integrated unit (13), a biomimetic wave energy capture and hydraulic power generation integrated unit (14), a seawater electrolysis hydrogen production integrated unit (3), a hydrogen storage integrated unit (5), and a monitoring system; The integrated unit (3) for seawater electrolysis hydrogen production includes a marine raw water pretreatment and purification system (3-1), a reverse osmosis seawater desalination system (3-2), a hydrogen multi-stage pressurization and compression system (3-3), a hydrogen deep purification and refining system (3-4), a core system for water electrolysis hydrogen production (3-5), and an energy storage and power distribution system (3-6). The high-altitude wind power generation integrated unit (13) includes a high-altitude wind energy capture aerodynamic wing assembly (13-1), a wing support frame (13-2), a high-altitude energy conversion chamber (13-3), a transmission bearing (13-4), and a power generation and energy storage unit (13-5); the wing support frame (13-2) is connected to the high-altitude energy conversion chamber (13-3) through the transmission bearing (13-4); The high-altitude energy conversion chamber (13-3) includes a permanent magnet rotor (13-3-1), an adjustable stator winding (13-3-2), a magnetic gap adjustment shim (13-3-3), a double-layer sealed chamber body (13-3-4), and a current rectification module (13-3-5); the permanent magnet rotor (13-3-1) is coaxially connected to the wing support frame (13-2); The biomimetic wave energy capture and hydraulic power generation integrated unit (14) includes a biomimetic wave energy capture component, a swing support mechanism, and a hydraulic energy conversion system; the biomimetic wave energy capture component includes a wave energy capture swing plate (14-3) and an edge guide wing assembly (14-4); the swing support mechanism includes a swing arm frame (14-1), a hinge shaft assembly (14-11), a swing arm force sensing pin assembly (14-12), and a swing limit and position feedback assembly (14-8); the hydraulic energy conversion system includes a main drive hydraulic cylinder assembly (14-13), an auxiliary balance hydraulic cylinder assembly (14-9), a hinge support assembly (14-14), a hydraulic pipeline assembly (14-6), and a monitoring module (14-5).

2. The offshore renewable energy coupled ultra-large hydrogen production platform system according to claim 1, characterized in that: The high-altitude wind energy capture aerodynamic wing assembly (13-1) includes a biomimetic arc-shaped main wing (13-1-1), a wing root flange (13-1-2), a wing guide rib (13-1-3), and a sealing end cap (13-1-4).

3. The offshore renewable energy coupled ultra-large hydrogen production platform system according to claim 1, characterized in that: The seawater electrolysis hydrogen production integrated unit (3) also includes a pressure monitoring system (3-7), a delivery pipeline system (3-8), an electrochemical energy storage battery (3-9), a multi-parameter monitoring sensor device (3-10), a hydrogen buffer storage tank (3-11), a desalinated freshwater buffer storage tank (3-12), and a hydrogen online purity detection and analysis system (3-13).

4. The offshore renewable energy coupled ultra-large hydrogen production platform system according to claim 1, characterized in that: The adjustable stator winding (13-3-2) is coaxially nested in a ring around the circumference of the permanent magnet rotor (13-3-1), and the magnetic gap adjustment shim (13-3-3) is fixed between the adjustable stator winding (13-3-2) and the inner wall of the double-layer sealed chamber (13-3-4).

5. The offshore renewable energy coupled ultra-large hydrogen production platform system according to claim 1, characterized in that: It also includes an offshore maintenance and living quarters unit (4), the top of which integrates a wind energy capture blade assembly (4-1) and a rooftop photovoltaic assembly (4-2).

6. The offshore renewable energy coupled ultra-large hydrogen production platform system according to claim 1, characterized in that: The hydrogen storage integrated unit (5) includes a safety pressure relief and exhaust pipe (5-1), a high-pressure hydrogen sealed storage tank (5-2), and a tank safety monitoring and control component (5-3).

7. The offshore renewable energy coupled ultra-large hydrogen production platform system according to claim 1, characterized in that: The wave-capturing oscillator (14-3) is a biomimetic arc-shaped wave-capturing structure.

8. The offshore renewable energy coupled ultra-large hydrogen production platform system according to claim 1, characterized in that: The bottom of the bearing platform (11) is fixed with a support column (6) and a wave-damping auxiliary operation sub-platform (7).

9. The offshore renewable energy coupled ultra-large hydrogen production platform system according to claim 1, characterized in that: The biomimetic wave energy capture and hydraulic power generation integrated unit (14) is located in the wave-facing area of ​​the bearing platform (11).

10. The offshore renewable energy coupled ultra-large hydrogen production platform system according to claim 1, characterized in that: The upper end of the swing arm (14-1) is connected to the wave energy capturing swing plate (14-3), and the lower end of the swing arm (14-1) is connected to the hinge shaft assembly (14-11) and the base main frame (14-10).

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