Wind-solar-storage integrated energy supply system for offshore islands and application of wind-solar-storage integrated energy supply system

Abstract

The invention provides an offshore island wind-light-storage integrated energy-water source supply system and application thereof, and particularly relates to the technical field of comprehensive utilization of renewable energy sources and island energy supply. The system comprises an auxiliary device; the wind-solar power generation module is used for converting wind energy and solar energy into electric energy; the RSOC module is used for supplementing electricity to the island power grid or supplementing hydrogen to the gas and hydrogen storage module and supplying oxygen to the island culture area; the gas and hydrogen storage module is used for storing hydrogen and external natural gas and supplying hydrogen and gas to the RSOC module and / or the central heating module; the central heating module is used for supplying heating heat to island residents; the seawater desalination module is used for converting seawater into fresh water for living and production; and the control system is used for ensuring the cooperative operation of each module and the self-regulation of the application mode. The integrated supply of wind power and photovoltaic power generation, renewable energy hydrogen production, gas and hydrogen storage, seawater desalination, heating and the like is integrated, and clean production, efficient conversion and multi-element utilization of island energy are achieved.

Description

Technical Field

[0001] This invention patent relates to the field of comprehensive utilization of renewable energy and island energy supply technology, specifically to an integrated wind, solar and energy storage energy-water supply system for offshore islands and its application. Background Technology

[0002] In my country, many remote islands are unable to connect to the national power grid due to geographical limitations, technological constraints, and cost constraints. These islands have long relied on diesel generators to meet their electricity needs, while simultaneously using firewood and coal for heating. This not only results in low energy efficiency but also generates substantial carbon emissions, causing severe pollution to the surrounding environment. Furthermore, this traditional energy supply model suffers from significant problems such as limited total energy supply, poor power stability, and high electricity costs, severely impacting the quality of life for island residents and hindering the sustainable development of related industries.

[0003] Furthermore, isolated islands at sea generally face a shortage of water for daily life and production, and obtaining freshwater is difficult and costly. However, island regions possess abundant renewable energy sources such as wind and solar power, with enormous potential for development and utilization. Therefore, organically combining renewable energy hydrogen production technology, energy storage systems, external gas supply technology, and seawater desalination technology can effectively solve the dual problems of energy and water shortages on isolated islands at sea, providing them with a clean, stable, and efficient energy and water supply solution, which has significant practical significance and application value. Summary of the Invention

[0004] To overcome the shortcomings of the prior art, this invention provides an integrated wind, solar, and energy storage system for offshore islands, along with its application. The specific technical solution is as follows: An integrated wind, solar, and energy storage system for offshore islands includes auxiliary equipment; a wind and solar power generation module for converting wind and solar energy into electricity and supplying power to the system itself and the island's power grid; an RSOC module for supplementing the island's power grid during periods of high electricity load, or for supplementing the gas and hydrogen storage module with hydrogen and supplying oxygen to the island's aquaculture areas during periods of low electricity load; a gas and hydrogen storage module for storing hydrogen produced by electrolysis and external natural gas, and supplying hydrogen and gas to the RSOC module and / or the centralized heating module; a centralized heating module for providing heating for island residents; a seawater desalination module for converting seawater into freshwater for domestic and industrial use; and a control system for monitoring and ensuring the coordinated operation of all modules, achieving self-regulation of the application mode.

[0005] Preferably, the auxiliary equipment includes a transformer and a gas reforming device.

[0006] Preferably, the wind and solar power generation module includes several vertical axis wind turbines, several monocrystalline silicon photovoltaic panels, a combiner box, and a surge protector; wherein, the power of each vertical axis wind turbine is 15KW; the power of each monocrystalline silicon photovoltaic panel is 300W; the installation direction of each monocrystalline silicon photovoltaic panel is south and the tilt angle is 30°; the vertical axis wind turbines and the monocrystalline silicon photovoltaic panels are all connected to a transformer through the combiner box.

[0007] Preferably, the RSOC module includes a hybrid window-type RSOC stack, a stack controller, and a heat exchanger; the hybrid window-type RSOC stack includes SOEC mode and SOFC mode, and the stack power is 50-60KW; the waste heat channel of the fuel electrode outlet manifold of the hybrid window-type RSOC stack is connected to the high-temperature medium side inlet of the heat exchanger; the positive and negative power terminals of the hybrid window-type RSOC stack are connected to a transformer through a power conversion device.

[0008] Preferably, the centralized heating module includes a heat exchange pipe network, a heating boiler, and a thermostat; the inlet of the heat exchange pipe network is connected to the high-temperature medium side outlet of the heat exchanger and the high-temperature heat medium output end of the heating boiler; the outlet of the heat exchange pipe network is connected to a heat dissipation terminal; and the water supply temperature in the heat exchange pipe network is controlled at 50℃~60℃.

[0009] Preferably, the gas and hydrogen storage module includes a hydrogen compressor, a high-pressure hydrogen storage tank, and several compressed natural gas cylinders; the outlets of the natural gas cylinders are respectively connected to the natural gas feedstock inlet of the gas reforming unit and the fuel gas inlet of the heating boiler; the reformed gas outlet of the gas reforming unit is connected to the feedstock gas inlet of the hydrogen purification unit; the inlet of the hydrogen compressor is respectively connected to the material channel of the fuel electrode outlet manifold of the hybrid window-type RSOC stack and the pure hydrogen outlet of the hydrogen purification unit; the exhaust end of the hydrogen compressor is connected to the inlet of the high-pressure hydrogen storage tank; the outlet of the high-pressure hydrogen storage tank is respectively connected to the fuel electrode inlet manifold of the hybrid window-type RSOC stack and the fuel gas inlet of the heating boiler. The total capacity of several compressed natural gas cylinders is 1000–1200 NM. 3 Preferably, the seawater desalination module includes a low-temperature multi-effect distillation device, a pretreatment filter, and a freshwater tank; the inlet of the pretreatment filter is connected to the seawater intake end; the outlet of the pretreatment filter is connected to the inlet of the feed main pipeline of the low-temperature multi-effect distillation device; the heat source inlet of the low-temperature multi-effect distillation device is connected to the high-temperature medium side outlet of the heat exchanger; the freshwater collection outlet of the low-temperature multi-effect distillation device is connected to the inlet of the freshwater tank; and the outlet of the freshwater tank is connected to the inlet of the domestic water pipeline via a water pump.

[0010] More preferably, the control system includes a controller, a pressure sensor, and a remote monitoring platform.

[0011] An application of an integrated wind, solar, and energy storage system for water supply on an isolated offshore island, employing the aforementioned integrated wind, solar, and energy storage system for water supply on an isolated offshore island, includes the following four application modes, specifically: Mode 1: Hydrogen production and storage using surplus green electricity: When the electricity generated by the wind and solar power generation module exceeds the sum of the island's power load and the system's self-powered electricity, the RSOC module switches to SOEC mode to perform water electrolysis and compresses and stores the hydrogen produced by electrolysis into a high-pressure hydrogen storage tank until the pressure inside the tank reaches its upper limit of storage pressure of 20 MPa, at which point hydrogen production stops; the oxygen produced by electrolysis is transported to the island's aquaculture area for oxygen supply. Mode 2, RSOC module power replenishment mode: When the power generated by the wind and solar power generation modules is less than the sum of the island's power load and the system's self-powered power, the RSOC module switches to SOFC mode to carry out the electrochemical oxidation power generation reaction of hydrogen. The high-pressure hydrogen storage tank provides the RSOC module with reactive hydrogen, which reacts with oxygen in the air in the hybrid window-type RSOC stack. The generated DC power is converted into 380V AC power by a transformer and then used to supplement the island's power grid. At the same time, the waste heat generated by the RSOC module is recovered. If the hydrogen reserves in the high-pressure hydrogen storage tank are insufficient to meet the electrochemical oxidation power generation reaction, several compressed natural gas cylinders are used to supplement the energy of the gas storage and hydrogen storage module through the gas reforming device. The generated hydrogen is used to participate in the hydrogen electrochemical oxidation power generation reaction of the RSOC module. Mode 3: Waste heat heating and seawater desalination mode: (1) In winter, the waste heat recovered from the RSOC module will be used first for the central heating module and the remaining waste heat will be transported to the seawater desalination module for freshwater conversion; if the waste heat from the RSOC module cannot meet the heating temperature requirements, the hydrogen in the high-pressure hydrogen storage tank and the natural gas in the compressed natural gas cylinder will be mixed in a ratio of 1:4 and then fed into the heating boiler for combustion until the heating temperature requirements are met. (2) All waste heat generated by the RSOC module in the spring, summer and autumn seasons is transferred to the seawater desalination module for freshwater conversion only; Mode 4: Emergency Energy Replenishment Mode When the island experiences continuous rainy and windless weather for more than three days, the wind and solar power generation modules cannot generate electricity normally, the island's power grid is insufficient, the RSOC module switches to SOFC mode, and the hydrogen storage tank's hydrogen reserves are insufficient to support the RSOC module's electrochemical oxidation power generation reaction. At this time, several compressed natural gas cylinders are used to supplement the gas and hydrogen storage modules through a gas reforming device. The generated hydrogen is used to participate in the RSOC module's hydrogen electrochemical oxidation power generation reaction. The generated DC power is converted into 380V AC power by a transformer and then used to supplement the island's power grid until the wind and solar resources return to normal. Then the control system switches to mode one or mode two to gradually replenish the hydrogen storage modules. If it is winter and the recovered waste heat generated by the RSOC module cannot meet the heating demand, natural gas must be directly supplied to the heating boiler for combustion in order to increase the heating temperature.

[0012] The beneficial effects of this invention are: The wind-solar-storage integrated energy-water supply system provided by this invention fully integrates wind power generation, photovoltaic power generation, renewable energy hydrogen production, gas and hydrogen storage, external gas replenishment, seawater desalination, and centralized heating into a unified energy supply system. It maximizes the potential of renewable energy on islands, realizes clean energy production, flexible storage, efficient conversion, and diversified utilization, and simultaneously solves the problem of freshwater supply, changing the predicament of energy and water supply in remote island areas. It has significant environmental, economic, and social benefits. Attached Figure Description

[0013] The accompanying drawings constituting this invention are provided to further understand this application and do not constitute an undue limitation of this application.

[0014] Figure 1 This is a system flowchart of the present invention; Figure 2 Flowchart for hydrogen production and energy storage using surplus green electricity; Figure 3 Flowchart for RSOC module power replenishment mode; Figure 4 Flowchart for waste heat heating and seawater desalination mode; Figure 5 Flowchart for emergency energy replenishment mode. Detailed Implementation

[0015] The specific implementation of the integrated wind, solar, and energy storage system for offshore islands and its application provided by the present invention will be further described in conjunction with the accompanying drawings and embodiments.

[0016] An integrated wind, solar, and energy storage system for offshore islands includes auxiliary equipment; a wind and solar power generation module for converting wind and solar energy into electricity and supplying power to the system itself and the island's power grid; an RSOC module for supplementing the island's power grid during periods of high electricity load, or for supplementing the gas and hydrogen storage module with hydrogen and supplying oxygen to the island's aquaculture areas during periods of low electricity load; a gas and hydrogen storage module for storing hydrogen produced by electrolysis and external natural gas, and supplying hydrogen and gas to the RSOC module and / or the centralized heating module; a centralized heating module for providing heating for island residents; a seawater desalination module for converting seawater into freshwater for domestic and industrial use; and a control system for monitoring and ensuring the coordinated operation of all modules, achieving self-regulation of the application mode.

[0017] Preferably, the auxiliary equipment includes a transformer and a gas reforming device.

[0018] Preferably, the wind and solar power generation module includes several vertical axis wind turbines, several monocrystalline silicon photovoltaic panels, a combiner box, and a surge protector.

[0019] Preferably, the RSOC module includes a hybrid window-type RSOC stack, a stack controller, and a heat exchanger; the hybrid window-type RSOC stack includes SOEC mode and SOFC mode, and the stack power is 50-60KW; the waste heat channel of the fuel electrode outlet manifold of the hybrid window-type RSOC stack is connected to the high-temperature medium side inlet of the heat exchanger; the positive and negative power terminals of the hybrid window-type RSOC stack are connected to a transformer through a power conversion device.

[0020] Preferably, the centralized heating module includes a heat exchange pipe network, a heating boiler, and a thermostat; the inlet of the heat exchange pipe network is connected to the high-temperature medium side outlet of the heat exchanger and the high-temperature heat medium output end of the heating boiler; the outlet of the heat exchange pipe network is connected to a heat dissipation terminal; and the water supply temperature in the heat exchange pipe network is controlled at 50℃~60℃.

[0021] Preferably, the gas and hydrogen storage module includes a hydrogen compressor, a high-pressure hydrogen storage tank, and several compressed natural gas cylinders (replenished by transporting compressed natural gas by ship); the outlets of the several natural gas cylinders are respectively connected to the natural gas feedstock inlet of the gas reforming unit and the fuel gas inlet of the heating boiler; the reformed gas outlet of the gas reforming unit is connected to the feedstock gas inlet of the hydrogen purification unit; the inlet of the hydrogen compressor is respectively connected to the material channel of the fuel electrode outlet manifold of the hybrid window-type RSOC stack and the pure hydrogen outlet of the hydrogen purification unit; the exhaust end of the hydrogen compressor is connected to the inlet of the high-pressure hydrogen storage tank; the outlet of the high-pressure hydrogen storage tank is respectively connected to the fuel electrode inlet manifold of the hybrid window-type RSOC stack and the fuel gas inlet of the heating boiler.

[0022] Preferably, the seawater desalination module includes a low-temperature multi-effect distillation device, a pretreatment filter, and a freshwater tank; the inlet of the pretreatment filter is connected to the seawater intake end; the outlet of the pretreatment filter is connected to the inlet of the feed main pipeline of the low-temperature multi-effect distillation device; the heat source inlet of the low-temperature multi-effect distillation device is connected to the high-temperature medium side outlet of the heat exchanger; the freshwater collection outlet of the low-temperature multi-effect distillation device is connected to the inlet of the freshwater tank; and the outlet of the freshwater tank is connected to the inlet of the domestic water pipeline via a water pump.

[0023] More preferably, the control system includes a controller, a pressure sensor, and a remote monitoring platform.

[0024] like Figure 1 As shown, this system includes five process lines: Line 1, wind and solar power generation module power generation line (such as...) Figure 1 (As shown by the black line in the middle): The electrical energy generated by the vertical axis wind turbine and the electrical energy generated by the monocrystalline silicon photovoltaic panel are collected in the combiner box and first sent to the transformer for voltage adjustment. Part of the adjusted AC power is directly connected to the 380V island power grid to power the island residents' lives, shop equipment, small production machinery, etc.; the other part is connected to the system to provide stable power support for the operation of various modules of the system.

[0025] Line 2, RSOC module power generation line (such as...) Figure 1 (As shown by the blue line in the middle): When the grid load is high and the power generated by the wind and solar power generation modules is insufficient, and supplemental power is needed, the gas and hydrogen storage module provides reactive hydrogen to the RSOC module, which switches to SOFC (solid oxide fuel cell) mode. The power generated by the electrochemical oxidation power generation reaction of the RSOC module is sent to the transformer for voltage adjustment. A portion of the adjusted AC power is directly connected to the 380V island power grid to ensure the continuous and stable power supply from the grid.

[0026] Line 3, Gas replenishment line for gas and hydrogen storage modules (e.g.) Figure 1 (As shown by the orange line): When the grid load is low, the control system switches the RSOC module to SOEC (solid oxide electrolyzer) mode. The surplus power drives the RSOC module to perform water electrolysis. The hydrogen produced by electrolysis is transported to the hydrogen compressor, where it is pressurized and converted into high-pressure hydrogen and stored in a high-pressure hydrogen storage tank for sealed storage, in preparation for subsequent power generation and heating. When wind and solar power generation is insufficient and hydrogen production is low, causing the hydrogen reserves in the gas and hydrogen storage module to be unable to meet the system's operational needs, several compressed natural gas cylinders are used to supplement the gas and hydrogen storage module through a gas reforming device to ensure the continuity and stability of the system's energy supply and avoid energy interruption problems.

[0027] Line 4, RSOC module oxygen supply line (e.g.) Figure 1 (As shown by the green line in the middle): In the RSOC module SOEC (solid oxide electrolyzer) mode, the oxygen generated by the water electrolysis reaction is transported to the island aquaculture (fish pond) area to increase the oxygen content of the aquaculture water, improve the aquaculture environment, and enhance the survival rate and product quality.

[0028] Line 5, freshwater conversion and heating lines (such as...) Figure 1 (As shown by the purple line in the middle): Part of the waste heat recovered by the RSOC module is used for centralized heating, and the other part is used for freshwater conversion; if the waste heat is insufficient to meet the heating demand, the gas and hydrogen storage module provides a mixture of hydrogen and natural gas to the centralized heating system for combustion to release heat energy; however, in special weather conditions where wind and solar power generation is continuously insufficient and hydrogen reserves are low, natural gas is directly introduced into the heating system for combustion to ensure that the heating effect meets the standards.

[0029] An integrated wind, solar, and energy storage system for water supply on an isolated offshore island integrates the above five process routes into the following four application modes to enable the system to self-regulate based on current operating conditions. Specifically: Mode 1: Hydrogen production and storage using surplus green electricity (e.g.) Figure 2 (as shown) When the total electrical energy generated by the wind and solar power generation modules (vertical axis wind turbine and monocrystalline silicon photovoltaic panel) exceeds the sum of the island's electricity load and the system's self-powered power supply, the control system controls the stack controller to switch the hybrid window-type RSOC stack in the RSOC module to SOEC mode for water electrolysis. The hydrogen produced by electrolysis is compressed and stored in the high-pressure hydrogen storage tank in the gas and hydrogen storage module until the pressure sensor detects that the pressure inside the tank has reached its upper limit of 20 MPa, at which point hydrogen production stops (the gas purity detector monitors the hydrogen purity in real time). The oxygen produced by electrolysis is transported to the island's aquaculture area for oxygen supply, ensuring that the dissolved oxygen in the water is maintained at ≥5 mg / L, improving the aquaculture environment and increasing the survival rate of fish and shrimp. At the same time, the waste heat (600℃~850℃) generated by the reaction is recovered using a heat exchanger.

[0030] Mode 2, RSOC module power replenishment mode (e.g.) Figure 3 (as shown) When the total electrical energy generated by the wind and solar power generation modules (vertical axis wind turbine and monocrystalline silicon photovoltaic panel) is less than the sum of the island's power load and the system's self-powered power supply, the control system controls the stack controller to switch the hybrid window-type RSOC stack in the RSOC module to SOFC mode to carry out the electrochemical oxidation power generation reaction of hydrogen. The high-pressure hydrogen storage tank in the gas and hydrogen storage module provides the reaction hydrogen to the RSOC module first, and it reacts with oxygen in the air in the hybrid window-type RSOC stack (the hydrogen needs to be reduced to 0.1 MPa by a pressure reducing valve before output, at a rate of 10 Nm³ / h, to meet the reaction pressure requirements). The generated DC power is converted into 380V AC power by a transformer, and then supplements the island's power grid. At the same time, the waste heat (600℃~900℃) generated by the RSOC module reaction is recovered by a heat exchanger.

[0031] If the hydrogen reserves in the high-pressure hydrogen storage tank are insufficient to meet the electrochemical oxidation power generation reaction of the hybrid window-type RSOC stack, then several compressed natural gas cylinders are used to supplement the energy of the gas storage and hydrogen storage module through a gas reforming device. The generated hydrogen is used to participate in the hydrogen electrochemical oxidation power generation reaction of the RSOC module to ensure the continuity of the reaction.

[0032] Mode 3: Waste heat heating and seawater desalination mode (such as...) Figure 4 As shown), this model varies depending on the season and the use of waste heat: (1) Winter: The waste heat recovered from the RSOC module is used to transport the remaining waste heat to the seawater desalination module for freshwater conversion, provided that the demand for centralized heating is met. However, if the waste heat from the RSOC module cannot meet the heating temperature requirements, the hydrogen in the high-pressure hydrogen storage tank and the natural gas in the compressed natural gas cylinder are mixed in a ratio of 1:4 and then fed into the heating boiler for combustion to supplement the heating energy demand until the heating temperature (50℃~60℃) requirement is met. (2) Spring, summer and autumn: All the waste heat generated by the RSOC module is delivered to the seawater desalination module and used only for freshwater conversion. In particular, the demand for water is large in summer, which can provide sufficient heat energy for seawater desalination, improve the efficiency of freshwater conversion, and meet the needs of residents for water use, farmland irrigation and aquaculture.

[0033] Mode 4: Emergency Energy Supplementation Mode (e.g.) Figure 5 (as shown) When the island experiences continuous rain and windless weather for more than three days, the wind and solar power generation modules cannot generate electricity normally, resulting in almost zero wind and solar power generation. Under these weather conditions, the island's power grid is insufficient. The control system switches the hybrid window-type RSOC stack in the RSOC module to SOFC mode. However, the hydrogen reserves in the high-pressure hydrogen storage tank are insufficient to support the RSOC module's electrochemical oxidation power generation reaction for an extended period during the severe weather. At this time, compressed natural gas cylinders are used to replenish the energy of the gas and hydrogen storage modules through a gas reforming device. The generated hydrogen is used to participate in the hydrogen electrochemical oxidation power generation reaction of the RSOC module. The generated DC power is converted into 380V AC power by a transformer and then used to replenish the island's power grid, ensuring power supply until wind and solar resources return to normal. The control system then automatically switches to mode one or mode two according to the power grid's power situation, gradually replenishing the hydrogen reserves in the high-pressure hydrogen storage tank. If it is winter and the recovered waste heat generated by the RSOC module cannot meet the heating demand, natural gas must be directly supplied to the heating boiler for combustion in order to increase the heating temperature and meet the heating demand.

[0034] This embodiment uses an island with a population of 100 as an example. It includes 6 vertical axis wind turbines, each with a power output of 15kW, for a total installed capacity of 90kW; 300 monocrystalline silicon photovoltaic panels, each with a power output of 300W, for a total installed capacity of 90kW. The DC power is converted to 380V AC power suitable for residential / industrial use via a transformer before being supplied to the island's power grid; and the total capacity of the compressed natural gas cylinders is 1000NM. 3 The high-pressure hydrogen storage tank can store 5m³ of hydrogen at a pressure of 20 MPa. 3 The system produces hydrogen. This system can fully meet the electricity needs of both the system itself and residential users, while simultaneously producing 20 tons of fresh water per day at a temperature of 50℃~60℃, sufficient to heat an area of ​​2000m². 2 .

[0035] The system provided by this invention uses wind and solar energy as its core energy sources, replacing traditional diesel and coal, achieving zero carbon emissions and greater efficiency and environmental friendliness. Through a triple guarantee of "wind and solar power generation + hydrogen energy storage + natural gas supplementation," it addresses the intermittent nature of wind and solar resources, minimizing the possibility of power, water, and heating interruptions, and ensuring greater stability and reliability. The control system enables automatic switching of application modes to adapt to different seasons and weather conditions, effectively solving the three core needs of islands: electricity, fresh water, and heating.

[0036] In this invention, terms such as "upper," "lower," "bottom," and "top" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are merely used to facilitate the description of the structural relationships of the various components or elements of this invention and do not specifically refer to any particular component or element in this invention, nor should they be construed as limiting the invention. Terms such as "connected" and "linked" should be interpreted broadly, indicating a fixed connection, an integral connection, or a detachable connection; a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can determine the specific meaning of the above terms in this invention based on the specific circumstances, and they should not be construed as limiting the invention.

[0037] Of course, the above description is not intended to limit the present invention, and the present invention is not limited to the examples given above. Any changes, modifications, additions or substitutions made by those skilled in the art within the scope of the present invention should also fall within the protection scope of the present invention.

Claims

1. An integrated wind, solar, and energy storage system for water supply to isolated offshore islands, characterized in that: Including auxiliary equipment and Wind and solar power generation modules are used to convert wind and solar energy into electrical energy and supply power to the system itself and the island's power grid; The RSOC module is used to replenish the island's power grid when the power load is high, or to replenish the gas and hydrogen storage module and supply oxygen to the island's aquaculture area when the power load is low. The gas and hydrogen storage module is used to store hydrogen produced by electrolysis and external natural gas, and to supply hydrogen and gas to the RSOC module and / or the central heating module. Central heating modules are used to provide heating for island residents; Seawater desalination module, used to convert seawater into freshwater for domestic and industrial use; The control system is used to monitor and ensure the coordinated operation of each module, enabling self-regulation of the application mode.

2. The integrated wind, solar, and energy storage system for offshore islands according to claim 1, characterized in that, The auxiliary equipment includes a transformer and a gas reforming unit.

3. The integrated wind, solar, and energy storage system for offshore islands according to claim 1, characterized in that, The wind and solar power generation module includes several vertical axis wind turbines, several monocrystalline silicon photovoltaic panels, a combiner box, and a surge protector; The vertical axis wind turbine has a power of 15KW / unit; the monocrystalline silicon photovoltaic panel has a power of 300W / piece; and the installation direction of several of the monocrystalline silicon photovoltaic panels is south and the tilt angle is 30°. Several of the vertical axis wind turbines and several monocrystalline silicon photovoltaic panels are connected to a transformer via a combiner box.

4. The integrated wind, solar, and energy storage system for offshore islands according to claim 2, characterized in that, The RSOC module includes a hybrid window-type RSOC stack, a stack controller, and a heat exchanger; The hybrid window-type RSOC stack includes SOEC mode and SOFC mode, and the stack power is 50-60KW; The waste heat passage of the hybrid window-type RSOC stack fuel electrode outlet manifold is connected to the high-temperature medium side inlet of the heat exchanger. The positive and negative power terminals of the hybrid window-type RSOC stack are connected to the transformer via a power conversion device.

5. The integrated wind, solar, and energy storage system for offshore islands according to claim 4, characterized in that, The centralized heating module includes a heat exchange network, a heating boiler, and a thermostat; The inlet of the heat exchange network is connected to the high-temperature medium side outlet of the heat exchanger and the high-temperature heat medium output end of the heating boiler, respectively; the outlet of the heat exchange network is connected to the heat dissipation terminal. The water supply temperature in the heat exchange pipeline network is controlled between 50℃ and 60℃.

6. The integrated wind, solar, and energy storage system for offshore islands according to claim 5, characterized in that, The gas and hydrogen storage module includes a hydrogen compressor, a high-pressure hydrogen storage tank, and several compressed natural gas cylinders. The outlet sides of several of the natural gas cylinders are respectively connected to the natural gas feedstock inlet of the gas reforming unit and the fuel gas inlet of the heating boiler; the reformed gas outlet of the gas reforming unit is connected to the feedstock gas inlet of the hydrogen purification unit. The inlet of the hydrogen compressor is connected to the material channel of the fuel electrode outlet manifold of the hybrid window-type RSOC stack and the pure hydrogen outlet of the hydrogen purification unit, respectively; the outlet of the hydrogen compressor is connected to the inlet of the high-pressure hydrogen storage tank; the outlet of the high-pressure hydrogen storage tank is connected to the fuel electrode inlet manifold of the hybrid window-type RSOC stack and the fuel gas inlet of the heating boiler, respectively. The total capacity of several compressed natural gas cylinders is 1000–1200 NM. 3 .

7. The integrated wind, solar, and energy storage system for offshore islands according to claim 4, characterized in that, The seawater desalination module includes a low-temperature multi-effect distillation device, a pretreatment filter, and a freshwater tank. The inlet of the pretreatment filter is connected to the seawater intake; the outlet of the pretreatment filter is connected to the inlet of the feed main pipeline of the low-temperature multi-effect distillation device; the heat source inlet of the low-temperature multi-effect distillation device is connected to the high-temperature medium side outlet of the heat exchanger; the freshwater collection outlet of the low-temperature multi-effect distillation device is connected to the inlet of the freshwater tank; and the outlet of the freshwater tank is connected to the inlet of the domestic water pipeline via a water pump.

8. The integrated wind, solar, and energy storage system for offshore islands according to claim 7, characterized in that, The control system includes a controller, a pressure sensor, and a remote monitoring platform.

9. An application of an integrated wind, solar, and energy storage system for water supply to isolated offshore islands, employing the integrated wind, solar, and energy storage system for water supply to isolated offshore islands as described in any one of claims 4-8, characterized in that... It includes the following four application modes, specifically: Mode 1: Hydrogen production and storage using surplus green electricity: When the electricity generated by the wind and solar power generation module exceeds the sum of the island's power load and the system's self-powered electricity, the RSOC module switches to SOEC mode to perform water electrolysis and compresses and stores the hydrogen produced by electrolysis into a high-pressure hydrogen storage tank until the pressure inside the tank reaches its upper limit of storage pressure of 20 MPa, at which point hydrogen production stops; the oxygen produced by electrolysis is transported to the island's aquaculture area for oxygen supply. Mode 2, RSOC module power replenishment mode: When the power generated by the wind and solar power generation modules is less than the sum of the island's power load and the system's self-powered power, the RSOC module switches to SOFC mode to carry out the electrochemical oxidation power generation reaction of hydrogen. The high-pressure hydrogen storage tank provides the RSOC module with reactive hydrogen, which reacts with oxygen in the air in the hybrid window-type RSOC stack. The generated DC power is converted into 380V AC power by a transformer and then used to supplement the island's power grid. At the same time, the waste heat generated by the RSOC module is recovered. If the hydrogen reserves in the high-pressure hydrogen storage tank are insufficient to meet the electrochemical oxidation power generation reaction, several compressed natural gas cylinders are used to supplement the energy of the gas storage and hydrogen storage module through the gas reforming device. The generated hydrogen is used to participate in the hydrogen electrochemical oxidation power generation reaction of the RSOC module. Mode 3: Waste heat heating and seawater desalination mode: (1) In winter, the waste heat recovered from the RSOC module will be used first for the central heating module and the remaining waste heat will be transported to the seawater desalination module for freshwater conversion; if the waste heat from the RSOC module cannot meet the heating temperature requirements, the hydrogen in the high-pressure hydrogen storage tank and the natural gas in the compressed natural gas cylinder will be mixed in a ratio of 1:4 and then fed into the heating boiler for combustion until the heating temperature requirements are met. (2) All waste heat generated by the RSOC module in the spring, summer and autumn seasons is transferred to the seawater desalination module for freshwater conversion only; Mode 4: Emergency Energy Replenishment Mode When the island experiences continuous rainy and windless weather for more than three days, the wind and solar power generation modules cannot generate electricity normally, and the island's power grid is insufficient. The RSOC module switches to SOFC mode. The hydrogen storage in the high-pressure hydrogen storage tank is insufficient to support the electrochemical oxidation power generation reaction of the RSOC module. At this time, several compressed natural gas cylinders are used to supplement the energy of the gas and hydrogen storage module through the gas reforming device. The generated hydrogen is used to participate in the hydrogen electrochemical oxidation power generation reaction of the RSOC module. The generated DC power is converted into 380V AC power by the transformer and then supplements the power grid of the island until the wind and solar resources return to normal. Then the control system switches to mode one or mode two to gradually replenish the hydrogen storage module. If it is winter and the recovered waste heat generated by the RSOC module cannot meet the heating demand, natural gas must be directly supplied to the heating boiler for combustion in order to increase the heating temperature.

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