Sea-land coordinated multi-energy coupling low-carbon new energy system and optimization scheduling method

Abstract

The present invention relates to a sea-land coordinated multi-energy coupling low-carbon new energy system and an optimization scheduling method, belonging to the technical field of low-carbon comprehensive energy power generation. The system comprises a low-carbon power generation unit, a green fuel synthesis unit, and an energy storage device arranged on the sea and islands, a green fuel comprehensive utilization unit and a carbon capture device arranged on land, and a sea-land coordinated low-carbon intelligent control center with multi-energy flow coupling; the system generates electricity with the help of abundant and stable solar energy and wind energy in the sea and islands, prepares hydrogen and ammonia with the help of seawater, and the green fuel synthesis unit uses the obtained hydrogen and the carbon dioxide generated by the system to re-prepare green fuel, thereby reducing the use of coal and natural gas in the green fuel comprehensive utilization unit. At the same time, the generated carbon dioxide is used as a raw material to re-prepare green fuel, thereby reducing the emission of harmful gases and carbon dioxide. The sea-land coordinated low-carbon intelligent control center realizes coordinated scheduling under multiple time scales, and the comprehensive utilization rate of system energy is improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of low-carbon integrated energy power generation, and in particular relates to a sea-land coordinated multi-energy coupling low-carbon new energy system and an optimization scheduling method. Background Art

[0002] Under the background of "dual carbon", the energy system is gradually transforming from traditional fossil energy to a low-carbon and diversified new energy system. In this transformation process, vigorously developing clean and low-carbon coupled energy systems including new energy has become an important direction for building a new energy system. However, there are problems such as intermittent, random and volatile power generation output of new energy sources. Therefore, vigorously promoting the construction of a multi-energy complementary integrated energy supply system is an inevitable choice for building a low-carbon new energy system, which is of great significance for promoting my country's energy transformation and economic and social development. In the process of building a low-carbon new energy system, due to the lack of land energy resources in my country's coastal areas, the carbon reduction path is heavily dependent on industrial transformation and upgrading and the increase in the proportion of external renewable energy. Constrained by the economic development and energy and power structure of the western region, the western region has encountered bottlenecks in providing renewable energy to the coastal areas to support the "dual carbon" strategy. It is necessary to deeply develop and utilize the rich offshore energy resources in the coastal areas to build a new energy system that is coordinated between land and sea.

[0003] However, there are several challenges in building a new energy system that coordinates sea and land and optimizing its resource scheduling: the time granularity is relatively coarse, and the consideration of the volatility of renewable energy resources and the dynamic flexibility constraints of energy supply units is not deep enough. It is necessary to couple the multi-level heterogeneity of renewable energy resource endowment in space from ocean, land, station to region, and the multi-scale volatility and intermittency in the time dimension; the existing multi-energy complementary coupling is mostly based on the performance and efficiency parameters of existing technologies, and fails to fully consider the complementary coordination of energy systems in the horizontal and vertical directions. At the same time, the interactive relationship between technical evaluation indicators such as carbon emission reduction, economy, safety, and flexibility is still not clear enough; most of them are oriented towards the grid-side regulation needs, ignoring the conversion and utilization process of carbon dioxide, and failing to fully tap the flexibility potential of energy production-product production coordinated regulation.

[0004] In response to the above challenges, considering the energy endowment and energy load trends of ocean and land, this paper studies the intelligent combination coupling characteristics and optimization scheduling methods of comprehensive energy production units with multi-energy fusion, multi-energy storage configuration, and multiple energy conversion methods in different scenarios of island-type multi-energy flow coupling systems. Based on the concept of controllable carbon migration of energy systems, the advantages of coal-fired power and renewable energy are brought into play, and the conversion of green fuels is comprehensively considered. An integrated solution for comprehensive energy production units with flexible energy supply for island-type multi-energy flow coupling systems is proposed, and a multi-energy coupling low-carbon energy system with coordinated planning, collaborative management, interactive response and mutual complementarity of cold-heat-electricity-gas multi-energy flows is constructed to effectively smooth out new energy fluctuations, reduce CO2 emissions, and improve system safety and flexibility. Summary of the invention

[0005] The purpose of the present invention is to provide a new type of low-carbon energy system with multi-energy coupling and optimization scheduling method based on sea-land collaboration, so as to fill the gap in the low-carbon comprehensive energy supply system based on sea-land collaboration, realize the preparation of green fuel driven by offshore renewable energy, large-scale storage and transportation of offshore green fuel, and diversified comprehensive utilization of efficient, low-carbon and intelligent green fuel, as well as more economical, low-carbon and reliable energy supply.

[0006] The present invention relates to a sea-land coordinated multi-energy coupling low-carbon new energy system, which comprises a low-carbon power generation unit, a green fuel synthesis unit, and an energy storage device arranged on the sea and the island, a green fuel comprehensive utilization unit and a carbon capture device arranged on the land, and a multi-energy flow coupled sea-land coordinated low-carbon intelligent control center; the low-carbon power generation unit generates zero-carbon or / and low-carbon electricity based on ocean or / and island wind energy, light energy, and nuclear energy; the green fuel synthesis unit utilizes the zero-carbon or / and low-carbon electricity generated by the low-carbon power generation unit to produce hydrogen and ammonia, utilizes hydrogen and carbon dioxide from the carbon capture device to produce methane and methanol, and the ammonia, methane and methanol are used as green fuels for the green fuel comprehensive utilization unit; the energy storage device uses the surplus electricity when there is still surplus electricity after the low-carbon power generation unit meets the power load The green fuel comprehensive utilization unit uses green fuel for power generation in priority when the power load is still unable to be met after the energy storage device compensates for the power shortage, and generates electricity by burning natural gas and / or coal when the power load is still unable to be met after the green fuel is used for power generation; the carbon capture device is used to capture the carbon dioxide generated by the green fuel comprehensive utilization unit and transport the carbon dioxide to the green fuel synthesis unit; the land-sea coordinated low-carbon intelligent control center calculates the zero-carbon and / or low-carbon power generation according to the collected ocean and / or island wind energy, light energy, and nuclear energy resource parameters, and regulates the operation strategies of the green fuel synthesis unit and the green fuel comprehensive utilization unit in combination with the output value of the energy storage device and the power load.

[0007] Preferably, the low-carbon power generation unit includes one or more combinations of photovoltaic power generation, wind power generation and nuclear power.

[0008] Preferably, the green fuel synthesis unit comprises:

[0009] The seawater electrolysis hydrogen production device driven by wind and solar fluctuating power sources is used to electrolyze seawater to produce hydrogen;

[0010] An electrocatalytic ammonia production device for synthesizing ammonia from hydrogen and nitrogen;

[0011] A methane synthesis unit for synthesizing methane from hydrogen and carbon dioxide;

[0012] Methanol synthesis unit, used to synthesize methanol from hydrogen and carbon dioxide.

[0013] The seawater electrolysis hydrogen production device is provided with a seawater electrolysis hydrogen production catalyst with a multi-level array structure and a photovoltaic / wind power fluctuating renewable energy hydrogen production control system.

[0014] Preferably, the surface of the electrode used in the electrolysis of seawater hydrogen production device is covered with a multi-element alloy catalyst modified by firing, and the doped precious metal element is one or more of nickel, ruthenium, cadmium, molybdenum, and platinum, and the electrode catalyst doping metal loading is less than 0.5 mg / cm 2 , cathode overpotential ≤300mV@1000mA / cm 2 , anode overpotential ≤600mV@1000mA / cm 2 The electrocatalytic material in the electrocatalytic ammonia production device is a metal organic complex, the cathode material is Al-N2 or Zr-N2 cathode material, and the electrolyte solution is one or more of ionic liquid, ionic liquid / organic solvent, ionic liquid / organic solvent / water.

[0015] The photovoltaic / wind power fluctuating renewable energy hydrogen production control system analyzes and optimizes the reaction performance of the electrolytic hydrogen production device through the electrochemical-thermal-fluid coupling numerical model of the electrolyzer, and adjusts the operation control of the seawater electrolysis hydrogen production device under the renewable energy fluctuating power supply conditions in real time, thereby achieving high efficiency, less power abandonment, and strong adaptability to power supply fluctuations. Hydrogen production by electrolysis of water.

[0016] Preferably, the storage and transportation unit includes a transport ship traveling between the island and the land, a green fuel receiving station set up on land, a floating high-pressure and low-temperature storage tank that can be disassembled, assembled and transported, an efficient active insulation system under all-weather complex sea conditions, and a green fuel safe and efficient transfer system for unstable platforms;

[0017] The transport ship is used to transport the green fuel generated by the green fuel synthesis unit to the green fuel receiving station, and to transport the carbon dioxide captured by the carbon capture device to the green fuel synthesis unit;

[0018] The green fuel receiving station is used to receive green fuel from transport ships;

[0019] The floating high-pressure and low-temperature storage tank is used to store the green fuel received by the green fuel receiving station;

[0020] The transfer system is used to realize unattended green fuel docking transfer / filling at sea, and then transport the green fuel to the green fuel comprehensive utilization unit or send the green fuel out;

[0021] The insulation system is used to insulate transport ships, green fuel receiving stations, floating high-pressure and low-temperature storage tanks and transfer systems.

[0022] Preferably, the green fuel receiving station includes an ammonia storage device, a methane storage device and a methanol storage device.

[0023] Preferably, the energy storage device includes one or a combination of electrochemical energy storage and thermal energy storage; the green fuel comprehensive utilization unit includes one or a combination of a coal-fired power generation device, a natural gas methane power generation device, a methanol power generation device, and an ammonia energy release device.

[0024] Preferably, the carbon capture device uses an absorption liquid to capture carbon dioxide in the flue gas generated by the green fuel comprehensive utilization unit through a chemical absorption method.

[0025] The present invention also relates to a method for coordinated optimization and scheduling of sea and land resources based on the above-mentioned sea-land coordinated multi-energy coupling low-carbon new energy system, which comprises the following steps:

[0026] Step 1. Collect wind energy and solar energy natural resource parameters at multiple time scales, and calculate the output of the low-carbon power generation unit by combining the natural resource parameters and the configuration amount of the low-carbon power generation unit;

[0027] Step 2. Input the local power load, calculate the power surplus based on the output and power load of the low-carbon power generation unit, if the power surplus is greater than 0, use the green fuel synthesis unit to produce green fuel to consume the surplus power or / and use the energy storage device to store the surplus power, and update the storage capacity of the energy storage device; if the power surplus is less than or equal to 0, use the energy storage device to make up for the power shortage and supply the green fuel synthesis unit to produce green fuel, and update the storage capacity of the energy storage device; wherein the green fuel produced includes ammonia, methane and methanol, set the operation strategy of the green fuel synthesis unit, that is, the output ratio of ammonia, methane and methanol, and calculate the total carbon consumption;

[0028] Step 3. Re-determine whether there is a power shortage. If there is still a power shortage, formulate an operation strategy for the green fuel comprehensive utilization unit. The operation strategy for the green fuel comprehensive utilization unit is set in a way that maximizes the output of green fuels and minimizes the output of carbon fuels, thereby making up for the power shortage;

[0029] Step 4. Based on the operation strategy formulated in step 3, calculate the carbon output of the green fuel comprehensive utilization unit and compare it with the total carbon consumption in step 2. If the carbon output is less than or equal to the total carbon consumption, return to step 3, adjust the operation strategy of the green fuel comprehensive utilization unit, increase the output of carbon fuel and reduce the output of green fuel; if the carbon output is greater than the total carbon consumption, calculate the total carbon emissions. If the total carbon emissions do not meet the emission and design requirements, return to step 2, adjust the operation strategy of the green fuel synthesis unit, increase the output ratio of methane and methanol and reduce the output ratio of ammonia; until the carbon output is adjusted to be less than or equal to the total carbon consumption, and the total carbon emissions meet the emission and design requirements, use the adjusted green fuel synthesis unit operation strategy and green fuel comprehensive utilization unit operation strategy as one of the operation scheduling schemes for the sea-land coordinated multi-energy coupling low-carbon new energy system;

[0030] Step 5. Repeat steps 1 to 4 to form a variety of operation and scheduling schemes for the sea-land coordinated multi-energy coupled low-carbon new energy system, screen out the operation and scheduling scheme that meets the objective function and constraints, and obtain the single-objective optimal operation and scheduling scheme or the multi-objective optimal Pareto frontier through the optimization algorithm, and use it to operate the sea-land coordinated multi-energy coupled low-carbon new energy system.

[0031] Preferably, each operation scheduling scheme formed in step 4 satisfies the following balance:

[0032] Island hydrogen should satisfy the following balance:

[0033]

[0034] in: is the hydrogen production, is the amount of hydrogen consumed in ammonia production, is the amount of hydrogen consumed in methane production, is the amount of hydrogen consumed in methanol production, is the amount of hydrogen stored in the island hydrogen storage device, is the amount of hydrogen released from the island hydrogen storage device;

[0035] Ammonia should satisfy the following balance:

[0036]

[0037] in, is the ammonia production, is the amount of ammonia loaded onto the vessel, is the amount of ammonia consumed by combustion on the island, is the amount of ammonia stored in the island ammonia storage device, is the amount of ammonia released from the island ammonia storage unit;

[0038] Methane should satisfy the following balance:

[0039]

[0040] in, is the methane production, is the amount of methane loaded onto the vessel, is the amount of methane burned on the island, is the amount of methane stored in the island methane storage device, is the amount of methane released from the island methane storage facility;

[0041] Methanol should satisfy the following balance:

[0042]

[0043] in, is the methanol production, is the amount of methanol loaded onto the vessel, is the amount of methanol burned and consumed on the island, is the amount of methanol stored in the island methanol storage unit, is the amount of methanol released from the Sea Island Methanol Storage Unit;

[0044] Carbon dioxide should satisfy the following balance:

[0045]

[0046] in, is the amount of carbon dioxide produced by the combustion of methane, is the amount of carbon dioxide produced by the combustion of methanol, is the amount of carbon dioxide produced by burning coal, is the amount of carbon dioxide captured by the island carbon capture facility, is the amount of carbon dioxide emitted by ships, is the amount of carbon dioxide emitted directly by the island;

[0047] The electricity should satisfy the following balance:

[0048]

[0049] in, Represent the power of wind, solar, ammonia, methane and methanol generators respectively, Respectively represent the electrical power consumption of hydrogen production, ammonia production, methane production and methanol production, Indicates the real-time power load of the island.

[0050] Preferably, the constraints in step 5 include:

[0051] The constraints of the ammonia synthesis process of the electrocatalytic ammonia production device are as follows:

[0052]

[0053] in, is the amount of hydrogen consumed in ammonia production, is the amount of nitrogen consumed in ammonia production, is the ammonia production;

[0054] The constraints of the methane synthesis process of the methane synthesis unit are as follows:

[0055]

[0056] in, is the amount of hydrogen consumed in methane production, is the amount of carbon dioxide produced by the combustion of methane, is the methane production;

[0057] The constraints of the methanol synthesis process of the methanol synthesis unit are as follows:

[0058]

[0059] in, is the amount of hydrogen consumed in methanol production, is the amount of carbon dioxide consumed in methanol production, is the methanol production;

[0060] Green fuel production energy consumption constraints, the constraint formula includes:

[0061]

[0062] in, Represents the energy consumption conversion relationship of the green fuel production process, They represent the power consumption of hydrogen, ammonia, methane and methanol production at time t, respectively. They represent the production of hydrogen, ammonia, methane and methanol at time t respectively;

[0063] Green fuel combustion energy consumption constraints, the constraint formula includes:

[0064]

[0065] in, Represents the energy consumption conversion relationship of the green fuel utilization process of the energy island, They represent the power of ammonia, methane and methanol generators at time t, respectively. They are the amount of ammonia, methane and methanol consumed by combustion on the island;

[0066] The constraint formula for the capacity of hydrogen storage tanks on islands is:

[0067]

[0068] in, and are the amount of ammonia stored and released by the island ammonia storage device at time t, is the total capacity of the ammonia storage device, and They represent the hydrogen storage capacity of the island hydrogen storage tank at time t and time t-1 respectively;

[0069] The capacity constraint of the methane storage tank of the transport ship is:

[0070]

[0071] in, and are the amount of methane stored and released by the methane storage device of the transport ship at time t, is the total capacity of the methane storage device, and represent the methane storage tank capacity of the transport ship at time t and time t-1 respectively;

[0072] The capacity constraint of the carbon dioxide storage tank of the transport ship is as follows:

[0073]

[0074] in, and are the amount of carbon dioxide stored and released by the carbon dioxide storage device of the transport ship at time t, is the total capacity of the CO2 storage device, and They represent the carbon dioxide storage tank capacity of the transport ship at time t and time t-1 respectively;

[0075] Transport ship operation status constraint, the constraint formula is:

[0076] I charge (t)+I discharge (t)+I sailing (t)+I mooring (t) = 1,

[0077] in, The time when the transport ship sets sail. The time when the transport ship arrives at the port, The shortest sailing time.

[0078] Preferably, the objective function in step 5 includes:

[0079] Running cost objective function, the function formula is:

[0080]

[0081] in, and are the direct carbon dioxide emissions from islands and land, is the carbon sink price, Price coal is the price of coal;

[0082] Run the profit objective function, the function formula is:

[0083]

[0084] Among them, revenue(t) is the operating revenue objective function, and They are the power load and power demand of the island at time t; Price electricity It is the price of electricity sold.

[0085] Preferably, in step 4, the surplus amount of green fuel is also calculated through the green fuel synthesis unit operation strategy and the green fuel comprehensive utilization unit operation strategy, and the calculated surplus amount is used as the green fuel delivery amount.

[0086] The objective function or constraints in step 5 include the levelized cost per kilowatt-hour to measure economic efficiency, the carbon emissions per kilowatt-hour to measure environmental impact, and the load satisfaction rate to measure power supply reliability; the optimization algorithm is a genetic algorithm, a particle swarm algorithm, or a linear programming solver.

[0087] Compared with the prior art, the technical solution of the present invention has the following beneficial effects:

[0088] 1. The multi-energy coupling low-carbon new energy system of sea-land synergy involved in the present invention builds low-carbon power generation units on the ocean and islands, generates electricity with the help of abundant and stable solar energy and wind energy in the ocean and island areas, and prepares hydrogen and ammonia with the help of seawater. The green fuel synthesis unit then uses the obtained hydrogen and the carbon dioxide produced by burning coal and natural gas in the green fuel comprehensive utilization unit to re-prepare green fuel. The system makes full use of the abundant and stable solar energy, wind energy and seawater resources in the ocean and islands to generate green fuel for use in the green fuel comprehensive utilization unit, thereby reducing the use of coal and natural gas in the green fuel comprehensive utilization unit. At the same time, the generated carbon dioxide is used as a raw material to re-prepare green fuel, reducing the emission of harmful gases and carbon dioxide.

[0089] 2. The sea-land coordinated low-carbon intelligent control method involved in the present invention constructs an operation strategy model of a green fuel synthesis unit and an operation strategy model of a green fuel comprehensive utilization unit, formulates an operation strategy of the green fuel comprehensive utilization unit based on the output of the output energy storage equipment of the low-carbon power generation unit and the power load, estimates carbon emissions based on the operation strategy of the green fuel comprehensive utilization unit, and then adjusts the operation strategy of the green fuel synthesis unit based on the carbon emissions, thereby providing an operation scheduling scheme that meets the carbon emission standards and uses less coal, and based on the objective functions or constraints of a variety of operation scheduling schemes, screens out operation scheduling schemes that meet the constraints, and obtains a single-objective optimal operation scheduling scheme or a multi-objective optimal Pareto frontier through an optimization algorithm, thereby providing a multi-form flexible resource safe and reliable operation mode for an island-type multi-energy flow coupling system (sending-end near-island / isolated offshore island), and can dynamically judge the sea-land coordinated scheduling capability of the multi-energy flow coupling system according to the supply and demand change trend, and realize coordinated scheduling at multiple time scales of days, hours, and minutes, and improve the comprehensive energy utilization rate of the system by more than 30%. BRIEF DESCRIPTION OF THE DRAWINGS

[0090] Figure 1 It is a schematic diagram of the structure of the sea-land coordinated multi-energy coupling low-carbon new energy system involved in the present invention;

[0091] Figure 2 Schematic diagram of a typical multi-energy coupling low-carbon energy system based on sea-land synergy

[0092] Figure 3 Schematic diagram of the coordinated optimization scheduling method for sea and land resources. DETAILED DESCRIPTION

[0093] The present invention is described in detail below, and the technical solutions in the embodiments of the present invention are clearly and completely described. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0094] Refer to the attached Figure 1 and 3 As shown, the sea-land coordinated multi-energy coupling low-carbon new energy system involved in the present invention includes low-carbon power generation units, green fuel synthesis units, and energy storage devices installed in the ocean and on islands, green fuel comprehensive utilization units and carbon capture devices installed on land, and a sea-land coordinated low-carbon intelligent control center with multi-energy flow coupling.

[0095] The low-carbon power generation unit includes one or more combinations of photovoltaic power generation, wind power generation and nuclear power, and the low-carbon power generation unit generates zero-carbon / low-carbon electricity based on wind, solar and nuclear resources.

[0096] The green fuel synthesis unit utilizes the zero-carbon / low-carbon electricity generated by the low-carbon power generation unit to produce hydrogen and ammonia, and utilizes hydrogen and carbon dioxide from the carbon capture device to produce methane and methanol. Ammonia, methane and methanol are used as green fuels for the green fuel comprehensive utilization unit; the green fuel synthesis unit includes: a seawater electrolysis hydrogen production device driven by wind and solar fluctuating power sources, an electrocatalytic ammonia production device, a methane synthesis device and a methanol synthesis device.

[0097] A seawater electrolysis hydrogen production device driven by a wind-solar fluctuating power supply is used to electrolyze seawater to produce hydrogen. The seawater electrolysis hydrogen production device is provided with a seawater electrolysis hydrogen production catalyst of a multi-level array structure and a photovoltaic / wind power fluctuating renewable energy hydrogen production control system; the photovoltaic / wind power fluctuating renewable energy hydrogen production control system analyzes and optimizes the reaction performance of the electrolysis hydrogen production device through an electrochemical-thermal-fluid coupling numerical model of the electrolyzer, and adjusts the operation control of the seawater electrolysis hydrogen production device under the condition of renewable energy fluctuating power supply in real time; the surface of the electrode used by the seawater electrolysis hydrogen production device for electrolyzing seawater is covered with a multi-element alloy catalyst modified by sintering, and the doped metal element is one or more of nickel, ruthenium, cadmium, molybdenum, and platinum, and the electrode catalyst doped metal loading is less than 0.5 mg / cm 2 , cathode overpotential ≤300mV@1000mA / cm 2 , anode overpotential ≤600mV@1000mA / cm 2 ;

[0098] The electrocatalytic ammonia production device is used to synthesize ammonia from hydrogen and nitrogen. The electrocatalytic material in the electrocatalytic ammonia production device is a metal organic complex, the cathode material is Al-N2, Zr-N2 cathode material, and the electrolyte solution is one or more of ionic liquid, ionic liquid / organic solvent, ionic liquid / organic solvent / water. The electrocatalytic ammonia production device adopts a multi-stage series mode of electrolytic cells to achieve large-scale production of green ammonia, and achieves a partial current density of 300mA cm in the electrocatalytic N2 ammonia production system. -2 Above, the ammonia yield reaches 5×10 -5 mol·s -1 cm -2 ,At the same time, the catalytic efficiency is maintained above 90% after 500h of electrolysis;

[0099] The methanol synthesis unit adopts a high-activity and high-product-selective CO2 hydrogenation catalyst to produce methanol under low-temperature and low-pressure conditions, and uses a new reaction-separation coupled CO2 hydrogenation reactor to achieve a carbon dioxide single-pass conversion rate ≥ 25%, a total hydrogen conversion rate ≥ 92%, a total methanol selectivity ≥ 96%, and a methanol content in the organic phase ≥ 99%.

[0100] The energy storage device is charged with surplus power when there is still surplus power after the low-carbon power generation unit meets the power load, and compensates for the power shortage when the low-carbon power generation unit cannot meet the power load. The energy storage device includes one or a combination of electrochemical energy storage and thermal energy storage.

[0101] The green fuel comprehensive utilization unit includes one or a combination of coal-fired power generation devices, natural gas methane power generation devices, methanol power generation devices, ammonia energy release devices, i.e., ammonia storage devices. When the energy storage device still cannot meet the power load after compensating for the power shortage, it will give priority to using green fuels for power generation. When the power load cannot be met after using green fuels for power generation, it will generate power by burning natural gas or / and coal. The green fuel comprehensive utilization unit generates steam by burning green fuels or carbon fuels and drives the steam turbine to operate. The steam turbine drives the generator to generate electricity. The generated steam is used for external heat supply. If there is still excess heat after external heat supply, it is stored in the molten salt tank. When the subsequent external heat supply is insufficient, the heat in the molten salt tank can act on the steam generator to generate steam to make up for the shortage of external heat supply. At this time, the steam generated by the green fuel comprehensive utilization unit will not heat the molten salt in the molten salt tank, and the temperature in the molten salt tank will decrease. When the temperature reaches the set lower limit, the electric energy generated by the green fuel comprehensive utilization unit can be used to heat the molten salt in the molten salt tank by electric heating.

[0102] The carbon capture device is used to capture the carbon dioxide generated by the green fuel comprehensive utilization unit and transport the carbon dioxide to the green fuel synthesis unit. Specifically, the carbon capture device uses an absorption liquid to capture the carbon dioxide in the flue gas generated by the green fuel comprehensive utilization unit through a chemical absorption method, and then separates the carbon dioxide from the absorption liquid through carbon analysis and supplies it to the green fuel synthesis unit.

[0103] The sea-land coordinated low-carbon intelligent control center calculates the zero-carbon / low-carbon power generation based on the collected ocean / island wind and solar nuclear resource parameters, and combines the output value of the energy storage device and the power load to control the operation strategy of the green fuel synthesis unit and the green fuel comprehensive utilization unit.

[0104] The above-mentioned multi-energy coupling low-carbon new energy system coordinated by sea and land also includes a large-scale green fuel storage and transportation unit suitable for complex sea conditions. The storage and transportation unit includes a transport ship traveling between islands and land and a green fuel receiving station set up on land, a floating high-pressure and low-temperature storage tank that can be disassembled, assembled and transported, an efficient active insulation system under all-weather complex sea conditions, and a green fuel safe and efficient transfer system for unstable platforms; the transport ship is used to transport the green fuel generated by the green fuel synthesis unit to the green fuel receiving station, and to transport the carbon dioxide captured by the carbon capture device to the green fuel synthesis unit to achieve controllable carbon migration; the green fuel receiving station is used to receive green fuel from the transport ship; the floating high-pressure and low-temperature storage tank is used to store the green fuel received by the green fuel receiving station; the transfer system is used to realize unmanned green fuel docking transfer / refueling at sea, and then transport the green fuel to the green fuel comprehensive utilization unit or send the green fuel out; the insulation system is used to insulate the transport ship, the green fuel receiving station, the floating high-pressure and low-temperature storage tank and the transfer system.

[0105] Refer to the attached Figure 2 As shown, the present invention also relates to a method for coordinated optimization and scheduling of sea and land resources, which comprises the following steps:

[0106] Step 1. Collect wind-solar energy resource parameters at multiple time scales, and calculate the output of low-carbon power generation units by combining natural resource parameters and the configuration amount of low-carbon power generation units.

[0107] Step 2. Input the local power load and calculate the power surplus P based on the output of the low-carbon power generation unit and the power load. 1surplus , the calculation formula is:

[0108] P 1surplus =P(t)-P demand (t) (1)

[0109] In the formula, P(t) is the output of the low-carbon power generation unit at time t, P demand (t) is the power load at time t;

[0110] If the power surplus is greater than 0, the green fuel synthesis unit is used to produce green fuel to consume the surplus power or / and the energy storage device is used to store the surplus power, and the storage capacity of the energy storage device is updated; if the power surplus is less than or equal to 0, the energy storage device is used to make up for the power shortage and supply the green fuel synthesis unit to produce green fuel, and the storage capacity of the energy storage device is updated; the green fuel produced includes ammonia, methane and methanol, and the operation strategy of the green fuel synthesis unit is set, that is, the output ratio of ammonia, methane and methanol, and the total carbon consumption is calculated;

[0111] Step 3. Recalculate the power surplus P 2surplus , and then judge whether there is a power shortage. The calculation formula is:

[0112] P 2surplus =P(t)+P 储 (t)-P 合 (t)-P demand (t) (2),

[0113] In the formula, P 储 (t) is the output of the energy storage device in step 2. When the energy storage device does not need to make up for the power shortage, P 储 (t) = 0, P 合 (t) Electricity consumed for the synthesis of green fuels;

[0114] If there is still a shortage of electricity, formulate an operation strategy for the green fuel comprehensive utilization unit. The operation strategy of the green fuel comprehensive utilization unit is set in a way to maximize the output of green fuels and minimize the output of carbon fuels, which refers to coal and / or natural gas, to make up for the shortage of electricity;

[0115] Step 4. Based on the operation strategy formulated in step 3, calculate the carbon output of the green fuel comprehensive utilization unit and compare it with the carbon consumption in step 2. If the carbon output is less than or equal to the carbon consumption, return to step 3, adjust the operation strategy of the green fuel comprehensive utilization unit, increase the output of natural gas and / or coal, and reduce the output of green fuel; if the carbon output is greater than the total carbon consumption, calculate the total carbon emissions. If the carbon emissions do not meet the emission and design requirements, return to step 2, adjust the operation strategy of the green fuel synthesis unit, increase the output ratio of methane and methanol and reduce the output ratio of ammonia; until the total carbon output is adjusted to be less than or equal to the total carbon consumption, and the total carbon emissions meet the emission and design requirements, use the adjusted green fuel synthesis unit operation strategy and green fuel comprehensive utilization unit operation strategy as one of the operation scheduling schemes for the sea-land coordinated multi-energy coupling low-carbon new energy system; based on this step, the green fuel surplus is also calculated through the green fuel synthesis unit operation strategy and the green fuel comprehensive utilization unit operation strategy, and the calculated surplus is used as the green fuel delivery volume.

[0116] Based on the above steps, a variety of operation and scheduling schemes for the sea-land coordinated multi-energy coupling low-carbon new energy system can be formed, and each operation and scheduling scheme should meet the following balance:

[0117] Island hydrogen should satisfy the following balance:

[0118]

[0119] in: is the hydrogen production, is the amount of hydrogen consumed in ammonia production, is the amount of hydrogen consumed in methane production, is the amount of hydrogen consumed in methanol production, is the amount of hydrogen stored in the island hydrogen storage device, is the amount of hydrogen released from the island hydrogen storage device;

[0120] Ammonia should satisfy the following balance:

[0121]

[0122] in, is the ammonia production, is the amount of ammonia loaded onto the vessel, is the amount of ammonia consumed by combustion on the island, is the amount of ammonia stored in the island ammonia storage device, is the amount of ammonia released from the island ammonia storage unit;

[0123] Methane should satisfy the following balance:

[0124]

[0125] in, is the methane production, is the amount of methane loaded onto the vessel, is the amount of methane burned on the island, is the amount of methane stored in the island methane storage device, is the amount of methane released from the island methane storage facility;

[0126] Methanol should satisfy the following balance:

[0127]

[0128] in, is the methanol production, is the amount of methanol loaded onto the vessel, is the amount of methanol burned and consumed on the island, is the amount of methanol stored in the island methanol storage unit, is the amount of methanol released from the Sea Island Methanol Storage Unit;

[0129] Carbon should satisfy the following balance:

[0130]

[0131] in, is the amount of carbon dioxide produced by the combustion of methane, is the amount of carbon dioxide produced by the combustion of methanol, is the amount of carbon dioxide produced by burning coal, is the amount of carbon dioxide captured by the island carbon capture facility, is the amount of carbon dioxide emitted by ships, is the amount of carbon dioxide emitted directly by the island;

[0132] The electricity should satisfy the following power balance:

[0133]

[0134] in, Represent the power of wind, solar, ammonia, methane and methanol generators respectively, Respectively represent the electrical power consumption of hydrogen production, ammonia production, methane production and methanol production, Indicates the real-time power load of the island.

[0135] Step 5: Based on the various operation scheduling schemes of the sea-land coordinated multi-energy coupling low-carbon new energy system formed in step 4, calculate the objective functions or constraints of the various operation scheduling schemes of the sea-land coordinated multi-energy coupling low-carbon new energy system, screen out the operation scheduling schemes that meet the constraints, and obtain the single-objective optimal operation scheduling scheme or the multi-objective optimal Pareto frontier through the optimization algorithm, and operate the sea-land coordinated multi-energy coupling low-carbon new energy system. The objective function or constraint includes:

[0136] The constraints of the ammonia synthesis process of the electrocatalytic ammonia production device are as follows:

[0137]

[0138] in, is the amount of hydrogen consumed in ammonia production, is the amount of nitrogen consumed in ammonia production, is the ammonia production;

[0139] The constraints of the methane synthesis process of the methane synthesis unit are as follows:

[0140]

[0141] in, is the amount of hydrogen consumed in methane production, is the amount of carbon dioxide produced by the combustion of methane, is the methane production;

[0142] The constraints of the methanol synthesis process of the methanol synthesis unit are as follows:

[0143]

[0144] in, is the amount of hydrogen consumed in methanol production, is the amount of carbon dioxide consumed in methanol production, is the methanol production;

[0145] Green fuel production energy consumption constraints, the constraint formula includes:

[0146]

[0147] in, Represents the energy consumption conversion relationship of the green fuel production process;

[0148] Green fuel combustion energy consumption constraints, the constraint formula includes:

[0149]

[0150]

[0151] in, Represents the energy consumption conversion relationship of the green fuel utilization process of the energy island;

[0152] The constraint formula for the capacity of hydrogen storage tanks on islands is:

[0153]

[0154] in, and are the amount of ammonia stored and released by the island ammonia storage device at time t, is the total capacity of the ammonia storage device, and They represent the hydrogen storage capacity of the island hydrogen storage tank at time t and time t-1 respectively;

[0155] The capacity constraint of the methane storage tank of the transport ship is:

[0156]

[0157] in, and are the amount of methane stored and released by the methane storage device of the transport ship at time t, is the total capacity of the methane storage device, and represent the methane storage tank capacity of the transport ship at time t and time t-1 respectively;

[0158] The capacity constraint of the carbon dioxide storage tank of the transport ship is as follows:

[0159]

[0160] in, and are the amount of carbon dioxide stored and released by the carbon dioxide storage device of the transport ship at time t, is the total capacity of the CO2 storage device, and They represent the carbon dioxide storage tank capacity of the transport ship at time t and time t-1 respectively;

[0161] Transport ship operation status constraint, the constraint formula is:

[0162] I charge (t)+I discharge (t)+I sailing (t)+I mooring (t) = 1,

[0163] in, The time when the transport ship sets sail. The time when the transport ship arrives at the port, is the shortest sailing time;

[0164] In step 5, the objective functions of various operation scheduling schemes of the multi-energy coupling low-carbon new energy system coordinated by sea and land include:

[0165] Running cost objective function, the function formula is:

[0166]

[0167] in, and are the direct carbon dioxide emissions from islands and land, respectively. CO2 is the carbon sink price, Price coal is the price of coal;

[0168] Run the profit objective function, the function formula is:

[0169]

[0170] Among them, revenue(t) is the operating revenue objective function, and are the power load and power demand of the island at time t, Price electricity It is the price of electricity sold.

[0171] In addition, the objective function or constraint includes the levelized cost per kilowatt-hour to measure economic efficiency, the carbon emissions per kilowatt-hour to measure environmental impact, and the load satisfaction rate to measure power supply reliability. The optimization algorithm is a genetic algorithm, a particle swarm algorithm, or a linear programming solver, where:

[0172] The formula for levelized cost of electricity is as follows:

[0173]

[0174] In the formula, the subscript i represents different equipment, I represents the initial investment cost, OM represents the annual fixed operation and maintenance cost (including labor cost, management cost, etc.), V represents the annual variable cost (mainly the cost of coal), N represents the equipment life, and r represents the discount rate (taken as 8%);

[0175] The formula for carbon emissions per kilowatt-hour is as follows:

[0176]

[0177] In the formula, m coal represents the annual coal consumption, θ coal represents the carbon emission factor of coal, m NG represents the annual natural gas consumption, θ NG represents the carbon emission factor of natural gas, t represents time, P demand represents the power demand, P shortage Indicates power shortage;

[0178] The formula for load satisfaction rate is as follows:

[0179]

[0180] In the formula, P demand represents the power demand, P shortage Indicates a power shortage.

[0181] Through multi-energy coupling, the power load satisfaction rate is ≥99%, and the wind / solar abandonment rate is less than 10%, which can reduce the carbon emissions per kilowatt-hour of the energy supply system from 800g / kWh to below 300g / kWh.

[0182] The present invention also relates to a method for coordinated optimization and scheduling of sea and land resources, which can be divided into day-ahead scheduling, intra-day scheduling and real-time scheduling according to scheduling time.

[0183] Day-ahead scheduling is to make energy production and consumption plans based on the forecast data of the sea-land collaborative energy system location (such as weather, energy demand, market prices, etc.) one day in advance, optimize resource allocation, reduce costs and maximize benefits. The sampling time of this stage is 1 hour. Scheduling not only considers energy costs, but also needs to evaluate potential market benefits, formulate production strategies that minimize risks, and ensure that resources achieve the best balance between efficiency and cost. The day-ahead scheduling decision process includes all decision variables.

[0184] Based on the day-ahead dispatch instructions, intraday dispatch reflects changes in shorter-term market and operating conditions. It is updated multiple times during the operating day and adjusts the day-ahead plan to adapt to actual changes. The sampling time is usually 15 minutes. This includes corrections to weather forecasts, changes in equipment performance, or responses to sudden changes in market demand. Intraday dispatch adjusts power generation and fuel use through a dynamic optimization model to maximize cost-effectiveness while ensuring the stability and reliability of system operation. The intraday dispatch decision-making process will no longer adjust the operating status of equipment with slower response times (such as ammonia, methane, methanol and other fuel preparation).

[0185] Based on the intraday dispatch instructions, real-time dispatch adjusts the power balance between the island and the land based on real-time data and instant system status, focusing on rapid response at the minute level. In real-time dispatch, the system needs to quickly handle emergencies (such as equipment failures or temporary load increases) and maintain system stability by instantly adjusting operating parameters (such as the charging and discharging status of energy storage equipment and emergency power generation dispatch). The challenge of real-time dispatch is to make accurate decisions in a very short time to ensure the coexistence of economic benefits and operational safety.

[0186] Through this hierarchical dispatch approach, the system can flexibly respond to various operational challenges, thereby effectively managing energy flows and optimizing the system's economics and environmental impact.

[0187] The present invention is described in detail above in conjunction with the embodiments, but the contents described are only preferred embodiments of the present invention and cannot be considered to limit the scope of implementation of the present invention. All equivalent changes and improvements made according to the scope of application of the present invention should still fall within the scope of the patent coverage of the present invention.

Claims

1. A new low-carbon energy system with multi-energy coupling and coordinated sea and land, characterized by: It includes low-carbon power generation units, green fuel synthesis units, and energy storage devices arranged on the ocean and islands, green fuel comprehensive utilization units and carbon capture devices arranged on land, and a multi-energy flow coupled sea-land collaborative low-carbon intelligent control center; the low-carbon power generation units generate zero-carbon or / and low-carbon electricity based on ocean or / and island wind energy, solar energy, and nuclear energy; the green fuel synthesis unit utilizes the zero-carbon or / and low-carbon electricity generated by the low-carbon power generation units to produce hydrogen and ammonia, and utilizes hydrogen and carbon dioxide from the carbon capture device to produce methane and methanol, and ammonia, methane and methanol are used as green fuels for the green fuel comprehensive utilization unit; the energy storage device is charged with surplus electricity when there is still surplus electricity after the low-carbon power generation unit meets the power load, and the energy storage device is charged with surplus electricity when ... The green fuel comprehensive utilization unit compensates for power shortages when the power unit cannot meet the power load; the green fuel comprehensive utilization unit gives priority to using green fuel for power generation when the power load is still unable to be met after the energy storage device compensates for the power shortage, and generates electricity by burning carbon fuel when the power load is still unable to be met after using green fuel for power generation; the carbon capture device is used to capture the carbon dioxide generated by the green fuel comprehensive utilization unit and transport the carbon dioxide to the green fuel synthesis unit; the sea-land coordinated low-carbon intelligent control center calculates zero-carbon and / or low-carbon power generation based on the collected ocean and / or island wind energy, light energy, and nuclear energy resource parameters, and regulates the operation strategy of the green fuel synthesis unit and the green fuel comprehensive utilization unit in combination with the output value of the energy storage device and the power load; The sea-land coordinated multi-energy coupling low-carbon new energy system adopts a sea-land resource coordinated optimization scheduling method, which includes the following steps: Step 1. Collect wind energy and light energy resource parameters at multiple time scales, and calculate the output of low-carbon power generation units by combining natural resource parameters and the configuration amount of low-carbon power generation units; Step 2. Input the local power load, calculate the power surplus based on the output and power load of the low-carbon power generation unit, if the power surplus is greater than 0, use the green fuel synthesis unit to produce green fuel to consume the surplus power or / and use the energy storage device to store the surplus power, and update the storage capacity of the energy storage device; if the power surplus is less than or equal to 0, use the energy storage device to make up for the power shortage and supply the green fuel synthesis unit to produce green fuel, and update the storage capacity of the energy storage device; wherein the produced green fuel includes ammonia, methane and methanol, set the operation strategy of the green fuel synthesis unit, that is, the output ratio of ammonia, methane and methanol, and calculate the carbon consumption; Step 3. Re-determine whether there is a power shortage. If there is still a power shortage, formulate an operation strategy for the green fuel comprehensive utilization unit. The operation strategy for the green fuel comprehensive utilization unit is set in a way that maximizes the output of green fuels and minimizes the output of carbon fuels, thereby making up for the power shortage; Step 4. Based on the operation strategy formulated in step 3, calculate the carbon output of the green fuel comprehensive utilization unit and compare it with the carbon consumption in step 2. If the carbon output is less than or equal to the total carbon consumption, return to step 3, adjust the operation strategy of the green fuel comprehensive utilization unit, increase the output of carbon fuel and reduce the output of green fuel; if the carbon output is greater than the total carbon consumption, calculate the total carbon emissions. If the total carbon emissions do not meet the emission and design requirements, return to step 2, adjust the operation strategy of the green fuel synthesis unit, increase the output ratio of methane and methanol and reduce the output ratio of ammonia; until the carbon output is adjusted to be greater than the total carbon consumption, and the total carbon emissions meet the emission and design requirements, use the adjusted green fuel synthesis unit operation strategy and green fuel comprehensive utilization unit operation strategy as one of the operation scheduling schemes for the sea-land coordinated multi-energy coupling low-carbon new energy system; Step 5. Repeat steps 1 to 4 to form a variety of operation and scheduling schemes for the sea-land coordinated multi-energy coupled low-carbon new energy system, screen out the operation and scheduling scheme that meets the objective function and constraints, and obtain the single-objective optimal operation and scheduling scheme or the multi-objective optimal Pareto frontier through the optimization algorithm, and use it to operate the sea-land coordinated multi-energy coupled low-carbon new energy system.

2. The sea-land coordinated multi-energy coupling low-carbon new energy system according to claim 1 is characterized by: The green fuel synthesis unit comprises: The seawater electrolysis hydrogen production device driven by wind and solar fluctuating power sources is used to electrolyze seawater to produce hydrogen; An electrocatalytic ammonia production device for synthesizing ammonia from hydrogen and nitrogen; A methane synthesis unit for synthesizing methane from hydrogen and carbon dioxide; Methanol synthesis unit, used to synthesize methanol from hydrogen and carbon dioxide.

3. The sea-land coordinated multi-energy coupling low-carbon new energy system according to claim 2 is characterized by: The surface of the electrode used for electrolyzing seawater by the electrolysis of seawater hydrogen production device is covered with a multi-element alloy catalyst modified by firing, and the doped precious metal element is one or more of nickel, ruthenium, cadmium, molybdenum, and platinum, and the electrode catalyst doped metal loading is less than 0.5 mg / cm 2 , cathode overpotential ≤300mV@1000mA / cm 2 , anode overpotential ≤600mV@1000mA / cm 2 The electrocatalytic material in the electrocatalytic ammonia production device is a metal organic complex, the cathode material is Al-N2 or Zr-N2 cathode material, and the electrolyte solution is one or more of ionic liquid, ionic liquid / organic solvent, ionic liquid / organic solvent / water.

4. The sea-land coordinated multi-energy coupling low-carbon new energy system according to claim 1 is characterized by: It also includes storage and transportation units, which include transport ships traveling between islands and land, green fuel receiving stations set up on land, floating high-pressure and low-temperature storage tanks that can be disassembled, assembled and transported, efficient active insulation systems under all-weather complex sea conditions, and green fuel safe and efficient transfer systems for unstable platforms; The transport ship is used to transport the green fuel generated by the green fuel synthesis unit to the green fuel receiving station, and to transport the carbon dioxide captured by the carbon capture device to the green fuel synthesis unit; The green fuel receiving station is used to receive green fuel from transport ships; The floating high-pressure and low-temperature storage tank is used to store the green fuel received by the green fuel receiving station; The transfer system is used to realize unattended green fuel docking transfer / filling at sea, and then transport the green fuel to the green fuel comprehensive utilization unit or send the green fuel out; The insulation system is used to insulate transport ships, green fuel receiving stations, floating high-pressure and low-temperature storage tanks and transfer systems.

5. The sea-land coordinated multi-energy coupling low-carbon new energy system according to claim 4 is characterized by: The green fuel receiving station includes an ammonia storage device, a methane storage device and a methanol storage device.

6. The sea-land coordinated multi-energy coupling low-carbon new energy system according to claim 1 is characterized by: The energy storage device includes one or a combination of electrochemical energy storage and thermal energy storage; the green fuel comprehensive utilization unit includes one or a combination of a coal-fired power generation device, a natural gas methane power generation device, a methanol power generation device, and an ammonia energy release device.

7. The sea-land coordinated multi-energy coupling low-carbon new energy system according to claim 1 is characterized by: The carbon capture device uses an absorption liquid to capture carbon dioxide in the flue gas generated by the green fuel comprehensive utilization unit through a chemical absorption method.

8. A method for coordinated optimization and dispatching of sea and land resources in a sea-land coordinated multi-energy coupling low-carbon new energy system, characterized in that: It includes the following steps: Step 1. Collect wind energy and light energy resource parameters at multiple time scales, and calculate the output of low-carbon power generation units by combining natural resource parameters and the configuration amount of low-carbon power generation units; Step 2. Input the local power load, calculate the power surplus based on the output and power load of the low-carbon power generation unit, if the power surplus is greater than 0, use the green fuel synthesis unit to produce green fuel to consume the surplus power or / and use the energy storage device to store the surplus power, and update the storage capacity of the energy storage device; if the power surplus is less than or equal to 0, use the energy storage device to make up for the power shortage and supply the green fuel synthesis unit to produce green fuel, and update the storage capacity of the energy storage device; wherein the produced green fuel includes ammonia, methane and methanol, set the operation strategy of the green fuel synthesis unit, that is, the output ratio of ammonia, methane and methanol, and calculate the carbon consumption; Step 3. Re-determine whether there is a power shortage. If there is still a power shortage, formulate an operation strategy for the green fuel comprehensive utilization unit. The operation strategy for the green fuel comprehensive utilization unit is set in a way that maximizes the output of green fuels and minimizes the output of carbon fuels, thereby making up for the power shortage; Step 4. Based on the operation strategy formulated in step 3, calculate the carbon output of the green fuel comprehensive utilization unit and compare it with the carbon consumption in step 2. If the carbon output is less than or equal to the total carbon consumption, return to step 3, adjust the operation strategy of the green fuel comprehensive utilization unit, increase the output of carbon fuel and reduce the output of green fuel; if the carbon output is greater than the total carbon consumption, calculate the total carbon emissions. If the total carbon emissions do not meet the emission and design requirements, return to step 2, adjust the operation strategy of the green fuel synthesis unit, increase the output ratio of methane and methanol and reduce the output ratio of ammonia; until the carbon output is adjusted to be greater than the total carbon consumption, and the total carbon emissions meet the emission and design requirements, use the adjusted green fuel synthesis unit operation strategy and green fuel comprehensive utilization unit operation strategy as one of the operation scheduling schemes for the sea-land coordinated multi-energy coupling low-carbon new energy system; Step 5. Repeat steps 1 to 4 to form a variety of operation and scheduling schemes for the sea-land coordinated multi-energy coupled low-carbon new energy system, screen out the operation and scheduling scheme that meets the objective function and constraints, and obtain the single-objective optimal operation and scheduling scheme or the multi-objective optimal Pareto frontier through the optimization algorithm, and use it to operate the sea-land coordinated multi-energy coupled low-carbon new energy system.

9. The method for coordinated optimization and scheduling of sea and land resources according to claim 8 is characterized in that: Each operation scheduling scheme formed in step 4 satisfies the following balance: Island hydrogen should satisfy the following balance: in: is the hydrogen production, is the amount of hydrogen consumed in ammonia production, is the amount of hydrogen consumed in methane production, is the amount of hydrogen consumed in methanol production, is the amount of hydrogen stored in the island hydrogen storage device, is the amount of hydrogen released from the island hydrogen storage device; Ammonia should satisfy the following balance: in, is the ammonia production, is the amount of ammonia loaded onto the vessel, is the amount of ammonia consumed by combustion on the island, is the amount of ammonia stored in the island ammonia storage device, is the amount of ammonia released from the island ammonia storage unit; Methane should satisfy the following balance: in, is the methane production, is the amount of methane loaded onto the vessel, is the amount of methane burned on the island, is the amount of methane stored in the island methane storage device, is the amount of methane released from the island methane storage facility; Methanol should satisfy the following balance: in, is the methanol production, is the amount of methanol loaded onto the vessel, is the amount of methanol burned and consumed on the island, is the amount of methanol stored in the island methanol storage unit, is the amount of methanol released from the Sea Island Methanol Storage Unit; Carbon dioxide should satisfy the following balance: in, is the amount of carbon dioxide produced by the combustion of methane, is the amount of carbon dioxide produced by the combustion of methanol, is the amount of carbon dioxide produced by burning coal, is the amount of carbon dioxide captured by the island carbon capture facility, is the amount of carbon dioxide emitted by ships, is the amount of carbon dioxide emitted directly by the island; The electricity should satisfy the following balance: in, Represent the power of wind, solar, ammonia, methane and methanol generators respectively, Respectively represent the electrical power consumption of hydrogen production, ammonia production, methane production and methanol production, Indicates the real-time power load of the island.

10. The method for coordinated optimization and scheduling of sea and land resources according to claim 8, characterized in that: The constraints in step 5 include: The constraints of the ammonia synthesis process of the electrocatalytic ammonia production device are as follows: in, is the amount of hydrogen consumed in ammonia production, is the amount of nitrogen consumed in ammonia production, is the ammonia production; The constraints of the methane synthesis process of the methane synthesis unit are as follows: in, is the amount of hydrogen consumed in methane production, is the amount of carbon dioxide produced by the combustion of methane, is the methane production; The constraints of the methanol synthesis process of the methanol synthesis unit are as follows: in, is the amount of hydrogen consumed in methanol production, is the amount of carbon dioxide consumed in methanol production, is the methanol production; Green fuel production energy consumption constraints, the constraint formula includes: in, Represents the energy consumption conversion relationship of the green fuel production process, They represent the power consumption of hydrogen, ammonia, methane and methanol production at time t, respectively. Respectively represent the production of hydrogen, ammonia, methane and methanol at time t; green fuel combustion energy consumption constraints, constraint formulas include: in, Represents the energy consumption conversion relationship of the green fuel utilization process of the energy island, They represent the power of ammonia, methane and methanol generators at time t, respectively. They are the amount of ammonia, methane and methanol consumed by combustion on the island; The constraint formula for the capacity of hydrogen storage tanks on islands is: in, and They represent the hydrogen storage capacity of the island hydrogen storage tank at time t and time t-1 respectively; The capacity constraint of the methane storage tank of the transport ship is: in, and are the amount of methane stored and released by the methane storage device of the transport ship at time t, is the total capacity of the methane storage device, and They represent the methane storage tank capacity of the transport ship at time t and time t-1 respectively; The capacity constraint of the carbon dioxide storage tank of the transport ship is: in, and are the amount of carbon dioxide stored and released by the carbon dioxide storage device of the transport ship at time t, is the total capacity of the CO2 storage device, and Respectively represent the capacity of the carbon dioxide storage tank of the transport ship at time t and time t-1; the operating state constraint of the transport ship, the constraint formula is: I charge (t)+I discharge (t)+I sailing (t)+I mooring (t)=1。 11. The method for coordinated optimization and scheduling of sea and land resources according to claim 8, characterized in that: The objective function in step 5 includes: Running cost objective function, the function formula is: in, is the carbon sink price, Price coal is the price of coal, is the amount of carbon dioxide emitted directly by the island; Run the profit objective function, the function formula is: Among them, revenue(t) is the operating revenue objective function, and are the power load and power demand of the island at time t, Price electricity It is the price of electricity sold.

12. The method for coordinated optimization and scheduling of sea and land resources according to claim 8, characterized in that: In the step 4, the surplus amount of green fuel is also calculated through the green fuel synthesis unit operation strategy and the green fuel comprehensive utilization unit operation strategy, and the calculated surplus amount is used as the delivery amount of green fuel.

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