Cold-heat-electricity-hydrogen-water-oxygen combined supply system based on wind and light utilization and operation method

Abstract

The invention discloses a cold-heat-electricity-hydrogen-water-oxygen combined supply system based on wind and light utilization and an operation method, and belongs to the technical field of comprehensive energy, electric energy of the system is mainly supplied by a wind power generation device, a photovoltaic photo-thermal assembly, a hydrogen fuel cell and a storage battery, and oxygen and hydrogen are generated by a proton exchange membrane water electrolysis device; clean fresh water comes from a hydrogen fuel cell power generation by-product, heat mainly comes from waste heat of a photovoltaic photo-thermal assembly and a power generation device, and cold energy is supplied by an absorption refrigeration device driven by hot water of the system or electric refrigeration. According to the system and the operation method, stable and efficient heterogeneous energy self-sufficiency is achieved by adopting the technologies of power generation device waste heat gradient utilization, plateau hydrogen internal combustion engine output oxygen combustion supporting, hydrogen storage device system internal cooling, wind and light absorption promotion and power grid adjustment through the hybrid energy storage device and the like. The method fully considers the association of wind and light fluctuation, system energy supply and power grid mutual assistance, and has the capability of stable operation of the system under complex and severe conditions.

Description

Technical Field

[0001] The present invention relates to the technical field of integrated energy, and in particular to a cold-heat-electricity-hydrogen-water-oxygen combined supply system and an operation method based on the utilization of wind and light. Background Art

[0002] Improving the utilization ratio of renewable energy is an effective way to optimize the energy supply structure and reduce carbon emissions. In regions rich in renewable energy such as wind and light resources in China, such as plateaus, deserts, and gobi areas, multiple types of energy supply are often required. However, the cost of separate supply of multiple types of heterogeneous energy (fresh water, heat, oxygen, electricity, etc.) urgently needed in the above regions is high, and the difficulty of synchronous supply is even greater. Therefore, there are challenges in solving the problem of multi-type energy supply locally and at low cost.

[0003] To solve the above problems, relevant explorations have been carried out on using renewable energy such as wind and light to provide multiple types of energy supply. The invention patent with the publication number CN115425679A discloses an electro-thermal-hydrogen multi-source coordinated energy supply system and method based on renewable energy, which uses photovoltaic power generation, wind power generation, solar thermal power generation, electrolytic cells, and fuel cell systems to provide power, heat, and hydrogen supply; the invention patent with the publication number CN103202204A proposes wind energy and solar energy power generation and configures a battery to drive a compression water maker to make water using humid air, and uses a desalination device to desalinate shallow groundwater in deserts and gobi; the invention patent with the publication number CN109523092B discloses a multi-energy complementary cold-heat-electricity combined supply system and its coordinated dispatching method, which combines wind power, photovoltaic power, and natural gas, and absorbs waste heat for refrigeration and heating while generating electricity to improve energy utilization efficiency.

[0004] However, the solutions disclosed in the foregoing patent applications still have the following deficiencies in solving the multi-category energy supply: 1. When directly making fresh water after using solar thermal, photovoltaic power generation, or wind turbine power generation, the cost is high, and wind and light power generation are greatly affected by climate, making it more difficult to continuously and stably supply water in water-scarce areas such as deserts, gobi, and wastelands; 2. It is impossible to simultaneously supply multi-level and multi-category energy such as cold, heat, electricity, oxygen, hydrogen, and clean fresh water, and provide a reliable preparation and operation method; 3. When using photovoltaic as the energy source, the photovoltaic-thermal (PV / T) method is not considered, resulting in waste of heat; the by-products in the processes of electrolyzing water to produce hydrogen and hydrogen fuel cells are ignored, resulting in waste of resources; 4. The waste heat generated by multiple energy systems is not effectively collected, and the cascade utilization of thermal energy cannot be achieved, resulting in waste of thermal energy. Summary of the Invention

[0005] The purpose of the present invention is to provide a cold-heat-electricity-hydrogen-water-oxygen combined supply system and an operation method based on the utilization of wind and light to solve the problems existing in the background art.

[0006] To achieve the above object, the present invention provides a combined cooling, heating, power, hydrogen, water, and oxygen supply system based on wind and solar energy utilization, including:

[0007] A wind power generation device and a photovoltaic-thermal component (PV / T), which are used to supply electricity to the combined supply system and the power grid;

[0008] A storage battery, which is connected to the photovoltaic-thermal component and is used to store the surplus electricity generated by the photovoltaic-thermal component that exceeds the electricity consumption;

[0009] A PEM water electrolysis hydrogen production device, which is connected to the power grid and is used to produce hydrogen and oxygen;

[0010] A hydrogen fuel cell, which is connected to the PEM water electrolysis hydrogen production device and the power grid and is used to provide electric energy;

[0011] A hydrogen internal combustion engine, which is connected to the power grid and is used to provide electric energy;

[0012] A heat exchanger, which is connected to the hydrogen fuel cell and is used to exchange heat with hot water;

[0013] A refrigeration device, which is connected to the heat exchanger and is used to generate cooling capacity.

[0014] Preferably, it further includes:

[0015] A hydrogen storage tank, which is connected to the PEM water electrolysis hydrogen production device and is used to store the hydrogen produced by the PEM water electrolysis hydrogen production device;

[0016] A pump, which is connected to the hydrogen storage tank and the hydrogen fuel cell and is used to pump the hydrogen in the hydrogen storage tank into the hydrogen fuel cell;

[0017] An oxygen storage tank, which is connected to the PEM water electrolysis hydrogen production device and the hydrogen internal combustion engine and is used to store the oxygen produced by the PEM water electrolysis hydrogen production device and supply oxygen to the hydrogen internal combustion engine;

[0018] A hot water storage tank, which is connected to the storage battery and the heat exchanger and is used to provide hot water to the heat exchanger;

[0019] A water storage tower, which is used to store the product water of the hydrogen fuel cell.

[0020] Preferably, it further includes a hydrogen load connected to the hydrogen storage tank and an oxygen load connected to the oxygen storage tank.

[0021] An operation method of a combined cooling, heating, power, hydrogen, water, and oxygen supply system based on wind and solar energy utilization, including the following content:

[0022] When the solar irradiation conditions are good and users have various energy demands such as cold, heat, electricity, hydrogen, water, and oxygen, the photovoltaic-thermal module receives solar radiation to generate electricity. The electric energy drives a pump to pump hydrogen and air into the hydrogen fuel cell; it also drives a PEM water electrolysis hydrogen production device to obtain hydrogen and oxygen, and the product water flows into the circulating water pipeline. At the same time, the low-temperature liquid water in the water storage tank exchanges heat with the PV / T and obtains heat after the drained water from the hydrogen fuel cell is incorporated; the hot water drives an absorption heat pump or obtains cold energy through electric refrigeration. When users do not have various energy demands such as cold, heat, electricity, hydrogen, water, and oxygen, the photovoltaic-thermal module and the wind power generation device generate electricity and feed it directly into the grid.

[0023] When the solar irradiation is poor or there is no radiation at night and users have various energy demands such as cold, heat, electricity, hydrogen, water, and oxygen, wind power generation provides electric energy to drive a pump to pump hydrogen and air into the hydrogen fuel cell and a PEM water electrolysis hydrogen production device to obtain hydrogen and oxygen, and a PEM water electrolysis hydrogen production device to obtain hydrogen and oxygen. The product water flows into the circulating water pipeline. At the same time, the heat supply is realized by heating the circulating water with an electric heating wire; the hot water drives an absorption heat pump or electric refrigeration to obtain cold energy. When users do not have various energy demands such as cold, heat, electricity, hydrogen, water, and oxygen, the wind power generation device generates electricity and feeds it directly into the grid.

[0024] Preferably, when the solar irradiation conditions are good and users have various energy demands such as cold, heat, electricity, hydrogen, water, and oxygen, the steps are as follows:

[0025] SA1. The photovoltaic-thermal module receives solar radiation and uses the photovoltaic effect to generate clean electric energy, and the generated electricity is preferentially supplied to users;

[0026] SA2. The photovoltaic power generation is inverted and voltage-converted and then drives a pump. The pump pumps hydrogen and air into the hydrogen fuel cell. After an electrochemical reaction occurs at the anode of the fuel cell, charges are released and electrons are provided to supply electric energy; the product water is stored in the water storage tower;

[0027] SA3. The photovoltaic power generation is inverted and voltage-converted and then drives a PEM water electrolysis hydrogen production device. Water in the device is electrolyzed to produce oxygen and hydrogen, which are respectively stored in the oxygen storage tank and the hydrogen storage tank;

[0028] SA4. Open valve V4, and the low-temperature water in the water storage tower flows into the circulating pipeline. The heat generated during the photovoltaic-thermal module power generation process is cooled by water, and the cooling water flows into the circulating pipeline. The heat of the bipolar plate during the fuel cell operation is taken away by the product water, and the cooling water flows into the circulating pipeline. The above cooling water carries hot water below 80 °C and can be directly supplied to users;

[0029] SA5. Open valves V8 and V5. The hot water from the water circulation pipeline in SA4 exchanges heat with the heat exchanger and then supplies the generator of the absorption refrigeration device. The generated cold energy is supplied to maintain the low-temperature environment of the hydrogen storage tank or supplied to users for food and medicine storage.

[0030] Preferably, the SA1 step is as follows:

[0031] SA11. When the power generation P of the photovoltaic-thermal component S is greater than or equal to the power consumption demand P of the system N (P S >P N ), preferentially store the excess power generation beyond the system power consumption (P S -P N ) in the storage battery;

[0032] SA12. After the storage battery is fully charged or when the battery is fully charged, the power consumption P for battery charging B , and the power generation P of the photovoltaic-thermal component has not been consumed yet. At this time, the remaining power (P S -P S -P N -P B ) is combined, inverted, and fed into the power grid;

[0033] SA13. When the power generation P of the photovoltaic-thermal component S is less than the power consumption demand P of the system N (P S <P N ), preferentially discharge the storage battery to supplement the required power, and the supplementary power is P B ;

[0034] SA14. When the storage battery reaches the discharge cut-off voltage and cannot continue to output electric energy to the system, and the power P supplemented by the storage battery for the system B is less than the power consumption required by the system, that is, P B <(P N -P S ), supplement the power generation of the wind power generation device to the system, and the supplementary power is P W ;

[0035] SA15. When encountering a windless day and the wind power generation device has no output or the power generated by the wind power generation device needs to be preferentially fed into the grid, and the power P supplemented by the wind power generation device for the system W is less than the power consumption required by the system, that is, P W <(P N -P S -P B ), open the valve V1 to supply fuel hydrogen to the hydrogen internal combustion engine, start the hydrogen internal combustion engine to supplement power supply to the system, and the waste heat of the internal combustion engine is exchanged through circulating water to increase the hot water temperature and supply it to users;

[0036] SA16. When the combined supply system is arranged in areas with thin air such as plateaus, in SA15, the hydrogen internal combustion engine burns insufficiently due to the low oxygen content in the air, resulting in limited power generation. At this time, the valve V21 of the pipeline connecting the oxygen storage tank and the hydrogen internal combustion engine is opened to supply oxygen to the hydrogen internal combustion engine, further improving the power generation of the hydrogen internal combustion engine.

[0037] Preferably, when the solar irradiation conditions are good and the user has no multiple energy consumption demands for cold, heat, electricity, hydrogen, water, and oxygen, the steps are as follows:

[0038] SB1. Receive the power grid dispatching instruction, and the wind power generation device and the photovoltaic-thermal component generate electricity and directly feed it into the grid; when the grid load is too large or the frequency is unstable, the battery, hydrogen fuel cell, and hydrogen internal combustion engine form a hybrid energy storage system, which outputs electricity simultaneously after starting, playing roles such as peak shaving, frequency modulation, and phase adjustment;

[0039] SB2. When the power generation of the wind power generation device and the photovoltaic-thermal component is poor in stability and does not meet the grid connection standards of the local area, that is, parameters such as voltage, frequency, phase, and power are not within the grid connection requirements, at this time, the battery and the PEM water electrolysis hydrogen production device charge / discharge / start, playing the role of tracking the output or suppressing the fluctuation.

[0040] Preferably, when the solar irradiation is poor or there is no radiation at night and the user has multiple energy consumption demands for cold, heat, electricity, hydrogen, water, and oxygen, the steps are as follows:

[0041] SC1. The wind power generation device generates clean electric energy, and the generated electricity is supplied to the user;

[0042] SC2. The electric energy generated by the wind power generation device drives a pump, and the pump pumps hydrogen and air into the hydrogen fuel cell. After an electrochemical reaction occurs at the anode of the fuel cell, charges are released and electrons are discharged to provide electric energy for the user; the water discharged from the hydrogen fuel cell is stored in the water storage tower to provide clean fresh water for the user;

[0043] SC3. The electric energy generated by the wind power generation device drives the PEM water electrolysis hydrogen production device, and water in the device is electrolyzed to produce oxygen and hydrogen, which are respectively stored in the oxygen storage tank and the hydrogen storage tank;

[0044] SC4. Open the discharge switch S1 of the battery. After the battery discharges, it forms an electric circuit with the heating wire in the hot water storage tank, and the ohmic heat generated by the heating wire heats the water in the hot water storage tank to provide hot water at different temperatures for the user;

[0045] SC5. Open the valves V8 and V5. The hot water from SC4 exchanges heat with the heat exchanger and then is supplied to the generator of the absorption refrigeration device, and the generated cooling capacity is supplied to the hydrogen storage tank to maintain a low-temperature environment or supplied to the user for food and medicine storage.

[0046] Preferably, the content of SC1 is as follows:

[0047] SC11. When the power generation P of the wind power generation device W is greater than or equal to the power consumption demand P of the system N (P W > P N ), preferentially store the part exceeding the system power consumption (P W - P N ) in the storage battery;

[0048] SC12. When the storage battery is charging and the power consumption P for battery charging B is less than the remaining power in step SC11 (P W - P N ), converge and invert the remaining power (P W - P N - P B ) and connect it to the power grid;

[0049] SC13. When the power generation P of the wind power generation device W is less than the power consumption demand P of the system N (P W < P N ), preferentially discharge the storage battery to supplement the required power, and the supplementary power is P B ;

[0050] SC14. When the storage battery discharges to the discharge cut-off voltage and cannot continue to output electric energy to the system, and the power P supplemented by the storage battery for the system B is less than the power consumption required by the system, that is, P B < (P N - P W ), open the valve V1 to supply fuel hydrogen to the hydrogen internal combustion engine, and start the hydrogen internal combustion engine to supplement power for the system. The waste heat of the internal combustion engine is exchanged through circulating water to increase the hot water temperature and supply it to users;

[0051] SC15. When the combined heat and power system is arranged in areas with thin air such as plateaus, in step S14, the hydrogen internal combustion engine burns insufficiently due to the low oxygen content in the air, resulting in limited power generation. At this time, open the valve V21 to supply oxygen to the hydrogen internal combustion engine to further increase the power generation of the hydrogen internal combustion engine.

[0052] Preferably, when the solar irradiation is poor or there is no radiation at night and the user has no multiple energy consumption demands such as cold, heat, electricity, hydrogen, water, and oxygen, the steps are as follows:

[0053] SD1. Receive the power grid dispatching instruction, and the wind power generation device generates electricity and is directly connected to the grid.

[0054] SD2. When the power generation stability of the wind power generation device is poor and does not meet the grid connection standards of the region, that is, parameters such as voltage, frequency, phase, and power are not within the grid connection requirements. At this time, the battery and the PEM water electrolysis hydrogen production device charge / discharge / start, playing the role of tracking output or suppressing fluctuations.

[0055] Therefore, the present invention adopts the above-mentioned cold-heat-electricity-hydrogen-water-oxygen combined supply system and operation method based on the utilization of wind and light, and has the following beneficial effects:

[0056] (1) Aiming at the problem of difficult supply of clean water and oxygen in areas such as plateaus, deserts, gobi, and wastelands, the cold-heat-electricity-hydrogen-water-oxygen combined supply system based on the utilization of wind and light makes full use of the rich wind and light resources in plateaus, deserts, gobi, and wastelands, and efficiently and low-costly solves the problems of clean fresh water production and oxygen supply in the above-mentioned areas by collecting by-products in related links while producing clean electricity;

[0057] (2) Aiming at the problem of difficult synchronous supply of multiple heterogeneous energy sources in plateaus, deserts, gobi, and wastelands, the utilized cold-heat-electricity-hydrogen-water-oxygen combined supply system and operation method synchronously realize the stable synchronous supply of multiple levels and categories of energy such as cold, heat, electricity, oxygen, clean fresh water, and hydrogen;

[0058] (3) Aiming at the fluctuations, intermittency, and instability characteristics of wind and light power generation and the phenomenon of abandoning wind and light during the grid connection process, batteries, hydrogen fuel cells, PEM water electrolysis hydrogen production devices, and hydrogen internal combustion engines are added to the wind and light power generation system, which can not only suppress the fluctuations of wind and light power generation, but also play the role of regulating the power grid by medium- and long-term energy storage;

[0059] (4) Aiming at the characteristics of limited energy utilization rate and weak coupling of traditional multi-energy combined supply systems, it is proposed to cascade-utilize the heat released during the working processes of photovoltaic-thermal components, hydrogen fuel cells, hydrogen internal combustion engines, battery packs, etc. according to the temperature level. The waste heat generated in winter can additionally assist the thermal management of the battery and the cold start of the hydrogen fuel cell to achieve efficient utilization of cascaded complementary heat energy. The cold energy obtained by waste heat utilization refrigeration or electric refrigeration can be supplied to the hydrogen storage equipment to maintain low temperature and improve the utilization efficiency of cold energy.

[0060] The technical solutions of the present invention will be further described in detail below with reference to the drawings and embodiments. Description of the Drawings

[0061] Figure 1 It is the system diagram and connection schematic diagram of the cold-heat-electricity-hydrogen-water-oxygen combined supply system of the present invention;

[0062] Figure 2 It is the operation plan diagram when the solar irradiation conditions are good and users have multiple energy utilization requirements such as cold, heat, electricity, hydrogen, water, and oxygen;

[0063] Figure 3 It is a running scheme diagram when the solar irradiation is poor or there is no radiation at night, and the user has various energy consumption demands such as cold, heat, electricity, hydrogen, water, and oxygen.

[0064] Reference numerals

[0065] 1. Wind power generation device; 2. Photovoltaic-thermal component; 3. PEM water electrolysis hydrogen production device; 4. Hydrogen fuel cell; 5. Hydrogen internal combustion engine; 6. Storage battery; 7. Hydrogen storage tank; 8. Hydrogen load; 9. Water storage tower; 10. Oxygen storage tank; 11. Oxygen load; 12. Heat storage water tank; 13. Heat exchanger; 14. Refrigeration device; 15. Power grid; 16. Pump. Detailed implementation manners

[0066] The following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present invention without creative efforts fall within the scope of protection of the present invention.

[0067] Please refer to Figure 1 , a cold-heat-electricity-hydrogen-water-oxygen combined supply system based on wind and light utilization, comprising: a wind power generation device 1 and a photovoltaic-thermal component 2, which are used to supply electricity to the combined supply system and the power grid 15;

[0068] A storage battery 6, connected to the photovoltaic-thermal component 2, which is used to store the surplus power generated by the photovoltaic-thermal component 2 exceeding the power consumption;

[0069] A PEM water electrolysis hydrogen production device 3, connected to the power grid 15, which is used to produce hydrogen and oxygen;

[0070] A hydrogen fuel cell 4, connected to the PEM water electrolysis hydrogen production device 3 and the power grid 15, which is used to provide electric energy;

[0071] A hydrogen internal combustion engine 5, connected to the power grid 15, which is used to provide electric energy;

[0072] A heat exchanger 13, connected to the hydrogen fuel cell 4, which is used to exchange heat with hot water;

[0073] A refrigeration device 14, connected to the heat exchanger 13, which is used to generate cooling capacity.

[0074] It further comprises:

[0075] A hydrogen storage tank 7, connected to the PEM water electrolysis hydrogen production device 3, which is used to store the hydrogen produced by the PEM water electrolysis hydrogen production device 3;

[0076] A pump 16, connected to the hydrogen storage tank 7 and the hydrogen fuel cell 4, which is used to pump the hydrogen in the hydrogen storage tank 7 into the hydrogen fuel cell 4;

[0077] An oxygen storage tank 10, connected to the PEM water electrolysis hydrogen production device 3 and the hydrogen internal combustion engine 5, is used to store the oxygen produced by the PEM water electrolysis hydrogen production device 3 and supply oxygen to the hydrogen internal combustion engine 5;

[0078] A hot water storage tank 12, connected to the battery 6 and the heat exchanger 13, is used to supply hot water to the heat exchanger 13;

[0079] A water storage tower 9 is used to store the product water of the hydrogen fuel cell 4.

[0080] It also includes a hydrogen load 8 connected to the hydrogen storage tank 7 and an oxygen load 11 connected to the oxygen storage tank 10.

[0081] The overall system is divided into four subsystems. The power generation subsystem consists of a photovoltaic-thermal component (PV / T) 2, a wind power generation device 1, a battery 6, a hydrogen fuel cell 4, a PEM water electrolysis hydrogen production device 3, and a hydrogen internal combustion engine 5.

[0082] The heating and cooling subsystem consists of a photovoltaic-thermal component, a hydrogen fuel cell 4, a PEM water electrolysis hydrogen production device 3, a hydrogen internal combustion engine 5, a battery 6, a refrigeration device 14, a heat exchanger 13, and a hot water storage tank 12. It forms a heating system with a wide range of sources and effective heat compensation and storage by using the waste heat of power generation on the back of the photovoltaic panel, the product hot water of the hydrogen fuel cell 4, the waste heat of the hydrogen internal combustion engine 5, and the electric heating method of the battery 6; the above heat sources and waste heat can be used to achieve refrigeration through the refrigeration device 14, or cold quantity can be produced by using electric energy through vapor compression or semiconductor refrigeration.

[0083] The hydrogen and oxygen production subsystem consists of a photovoltaic-thermal component 2, a wind power generation device 1, a PEM water electrolysis hydrogen production device 3, a battery 6, a hydrogen storage tank 7, and an oxygen storage tank 10. It electrolyzes water as a working medium to produce hydrogen and oxygen, which are respectively stored in the hydrogen storage tank 7 and the oxygen storage tank 10.

[0084] The water production system subsystem mainly consists of a photovoltaic-thermal component 2, a wind power generation device 1, a PEM water electrolysis hydrogen production device 3, a battery 6, a hydrogen storage tank 7, and a water storage tower 9. The main source of water is the by-product during the operation of the hydrogen fuel cell 4, realizing the efficient utilization of energy.

[0085] In the power generation subsystem, the battery 6, the hydrogen fuel cell 4, and the hydrogen internal combustion engine 5, etc. form a hybrid energy storage system. In addition to meeting the synchronous supply of multiple heterogeneous energy sources in the system itself, it has the function of adjusting multiple application scenarios of long and short-term energy storage, such as suppressing the power fluctuation of wind power, tracking the output, peak shaving, and short-term frequency modulation, improving the stability and reliability of the power generation system and the power grid 15.

[0086] In the heating and cooling subsystem, the heat source heat exchange sequence and heat utilization temperature are carried out in accordance with the waste heat of the hydrogen internal combustion engine 5, the heat release of the fuel cell 4, the photovoltaic-thermal component 2, and the thermal management of the battery 6, realizing the cascaded utilization of thermal energy; refrigeration can be completed by an absorption heat pump system or an electric refrigeration method, and the refrigerating capacity provides cooling for the low-temperature hydrogen storage tank 7 and preserves food, medicine, etc.

[0087] The hydrogen and oxygen production subsystem uses the rich wind and light resources in plateau and desert areas to generate electricity and drive the PEM water electrolysis device to simultaneously produce green hydrogen and oxygen. The hydrogen is used for local power generation or exported, and the oxygen is used for plateau medical use or combustion support of the hydrogen internal combustion engine 5.

[0088] The water production system collects and stores the products during the operation of the hydrogen fuel cell 4. On the one hand, it is used for the recycling of the PEM water electrolysis hydrogen production device 3, and on the other hand, it is used as a heat storage working medium to cool each power generation device and absorb waste heat.

[0089] The refrigeration process in the heating and cooling subsystem includes absorption refrigeration and semiconductor refrigeration. When the circulating water temperature of the system is above 40 °C, absorption refrigeration is used; when the circulating water temperature is below 40 °C, electric refrigeration is used to obtain cooling capacity.

[0090] When the output of the hydrogen fuel cell 4 in the power generation subsystem decreases due to insufficient oxygen concentration in the plateau area, the oxygen produced after PEM water electrolysis is collected and supplied to the anode of the hydrogen fuel cell 4 to increase the concentration of reactants and increase the power generation of the system.

[0091] Such as Figures 2-3 , an operation method of a cold-heat-electricity-hydrogen-water-oxygen combined supply system based on wind and light utilization, includes:

[0092] a. When the solar irradiation conditions are good and the user has various energy consumption demands for cold, heat, electricity, hydrogen, water, and oxygen, the photovoltaic-thermal component 2 receives solar radiation to generate electricity. The electric energy drives the pump 16 to pump hydrogen, air, and the PEM water electrolysis device 3 to obtain hydrogen and oxygen, and the product water flows into the circulating water pipeline; at the same time, the low-temperature liquid water in the water storage tank exchanges heat with the PV / T and obtains heat after flowing into the drained water of the hydrogen fuel cell 4; the hot water drives the absorption heat pump or obtains cooling capacity through electric refrigeration.

[0093] When the power generation of the photovoltaic-thermal component 2 is greater than the user's electricity demand, the surplus electric energy is preferentially stored in the battery 6, and secondly, the excess power is converged, inverted, and fed into the grid;

[0094] When the power generation of the photovoltaic-thermal component 2 does not meet the user's electricity demand, the battery 6 is preferentially discharged to supply power. If it still cannot be satisfied, the wind turbine power generation is supplied to the user; if there is no wind, the hydrogen internal combustion engine 5 starts to supply power to the user. The waste heat of the internal combustion engine exchanges heat through the circulating water to increase the hot water temperature and supply it to the user;

[0095] When the user has no demand for multiple types of energy such as cold, heat, electricity, hydrogen, water, and oxygen, the photovoltaic-thermal module 2 and the wind turbine generate electricity and are directly connected to the grid.

[0096] When the power generation characteristics (voltage, frequency, phase, etc.) of wind and solar power do not meet the grid connection requirements, the grid 15 has insufficient peak shaving capacity, or there are frequency fluctuations, the battery 6, the hydrogen fuel cell 4, and the hydrogen internal combustion engine 5 output electricity simultaneously to provide functions such as suppressing fluctuations, peak shaving and valley filling, frequency regulation, and tracking power output.

[0097] When the solar irradiation conditions are good and the user has multiple energy demands for cold, heat, electricity, hydrogen, water, and oxygen, the steps are as follows:

[0098] SA1. The photovoltaic-thermal module 2 receives solar radiation and uses the photovoltaic effect to generate clean electric energy. The generated electricity is preferentially supplied to the user.

[0099] SA2. The photovoltaic power generation is inverted and voltage-converted, and then drives the pump 16. The pump 16 pumps hydrogen and air into the hydrogen fuel cell 4. After an electrochemical reaction occurs at the anode of the fuel cell, charges are released and electrons are provided to supply electric energy. The product water is stored in the water storage tower 9.

[0100] SA3. The photovoltaic power generation is inverted and voltage-converted, and then drives the PEM water electrolysis hydrogen production device 3. Water in the device is electrolyzed to produce oxygen and hydrogen, which are respectively stored in the oxygen storage tank 10 and the hydrogen storage tank 7.

[0101] SA4. Open the valve V4. The low-temperature water in the water storage tower 9 flows into the circulation pipeline. The heat generated during the power generation process of the photovoltaic-thermal module 2 is cooled by water, and the cooling water flows into the circulation pipeline. The heat of the bipolar plate during the operation of the fuel cell is carried away by the product water, and the cooling water flows into the circulation pipeline. The above cooling water carries hot water below 80 °C and can be directly supplied to the user.

[0102] SA5. Open the valves V8 and V5. The hot water from the water circulation pipeline in SA4 exchanges heat with the heat exchanger 13 and then is supplied to the generator of the absorption refrigeration device 14. The generated cooling capacity is supplied to the hydrogen storage tank 7 to maintain a low-temperature environment or supplied to the user for food and medicine storage.

[0103] In this embodiment, the electric energy supply of the combined supply system is mainly provided by the photovoltaic-thermal module 2, and the wind power generation device is default to be directly connected to the grid. Since the multiple energy demands of the system are affected by many factors such as the actual demand of the user, season, and weather, the above operation method of the multi-energy combined supply system is adjusted according to the actual situation.

[0104] The steps of SA1 are as follows:

[0105] SA11. When the power generation amount P of the photovoltaic-thermal module 2 S is greater than or equal to the power consumption demand P of the system N (P S > PN ) First, the part of the power exceeding the system power consumption (P S -P N ) is stored in the storage battery 6;

[0106] When SA12 indicates that the storage battery 6 is fully charged or the battery charging has consumed the power P B , and the power generation P of the photovoltaic-thermal component 2 has not been completely consumed. At this time, the remaining power (P S -P S -P N -P B ) is combined, inverted, and then incorporated into the power grid 15;

[0107] SA13. When the power generation P of the photovoltaic-thermal component 2 S is less than the system power consumption demand P N (P S <P N ), the required power is preferentially supplemented by discharging the storage battery 6, and the supplementary power is P B ;

[0108] SA14. When the storage battery 6 reaches the discharge cut-off voltage and cannot continue to output electric energy to the system, and the power P supplemented by the storage battery 6 for the system B is less than the system power consumption requirement, that is, P B <(P N -P S ), the power generation of the wind power generation device 1 is supplemented to the system, and the supplementary power is P W ;

[0109] SA15. When encountering a windless day and the wind power generation device 1 has no output or the power generated by the wind power generation device 1 needs to be preferentially fed into the grid, and the power P supplemented by the wind power generation device 1 for the system W is less than the system power consumption requirement, that is, P W <(P N -P S -P B ), the valve V1 is opened to supply fuel hydrogen to the hydrogen internal combustion engine 5, and the hydrogen internal combustion engine 5 is started to supplement power for the system. The waste heat of the internal combustion engine is exchanged through circulating water to increase the hot water temperature and supply it to users;

[0110] SA16. When the combined heat and power system is arranged in an area with thin air such as the plateau, in SA15, the hydrogen internal combustion engine 5 burns insufficiently due to the low oxygen content in the air, resulting in limited power generation. At this time, the valve V21 is opened to supply oxygen to the hydrogen internal combustion engine 5 to further increase the power generation of the hydrogen internal combustion engine 5.

[0111] When the solar irradiance conditions are good and the user has no multiple energy consumption demands for cold, heat, electricity, hydrogen, water, and oxygen, the steps are as follows:

[0112] SB1. Receive the dispatching instructions of the power grid 15, and the power generated by the wind power generation device 1 and the photovoltaic-thermal component 2 is directly fed into the grid.

[0113] SB2. When the power generation of the wind power generation device 1 and the photovoltaic-thermal component 2 is unstable and does not meet the grid connection standards of the local area, that is, parameters such as voltage, frequency, phase, and power are not within the grid connection requirements. At this time, the battery 6 and the PEM water electrolysis hydrogen production device 3 charge / discharge / start, playing a role in tracking the output or suppressing fluctuations.

[0114] In the above step SB1, when the load of the power grid 15 is too large or the frequency is unstable, the battery 6, the hydrogen fuel cell 4, and the hydrogen internal combustion engine 5 form a hybrid energy storage system. After starting, they output electricity simultaneously, playing roles in peak shaving, frequency modulation, and phase modulation, etc.

[0115] b. When the solar irradiation is poor or there is no radiation at night, and the user has various energy consumption demands such as cold, heat, electricity, hydrogen, water, and oxygen, the wind power generation provides electrical energy to drive the hydrogen fuel cell 4 (pumping in hydrogen and air) and the PEM water electrolysis hydrogen production device 3 to obtain hydrogen and oxygen, and the product water is incorporated into the circulating water pipeline; meanwhile, the heat supply is realized by heating the circulating water with an electric heating wire; the hot water drives an absorption heat pump or an electric refrigerator to obtain cooling capacity.

[0116] When the wind power generation is greater than the user's electricity demand, the surplus electrical energy is preferentially stored in the battery 6, and secondly, the excess electricity is fed into the grid.

[0117] When the wind power generation does not meet the user's electricity demand or there is no wind, the battery 6 discharges to supply power to the user. If it still cannot meet the demand, the hydrogen internal combustion engine 5 starts to supply power to the user, and the waste heat is supplied to the user after heat exchange through the circulating water.

[0118] When the user does not have various energy consumption demands such as cold, heat, electricity, hydrogen, water, and oxygen, the wind turbine generates electricity and is directly fed into the grid.

[0119] When the solar irradiation is poor or there is no radiation at night, and the user has various energy consumption demands such as cold, heat, electricity, hydrogen, water, and oxygen, the steps are as follows:

[0120] SC1. The wind power generation device 1 generates clean electrical energy, and the generated electricity is supplied to the user.

[0121] SC2. The electrical energy generated by the wind power generation device 1 drives the pump 16. The pump 16 pumps hydrogen and air into the hydrogen fuel cell 4. After an electrochemical reaction occurs at the anode of the fuel cell, charges are released and electrons are released to provide electrical energy to the user; the water discharged from the hydrogen fuel cell 4 is stored in the water storage tower 9 to provide clean fresh water to the user.

[0122] SC3. The electrical energy generated by the wind power generation device 1 drives the PEM water electrolysis hydrogen production device 3. Water in the device undergoes electrolysis to produce oxygen and hydrogen, which are respectively stored in the oxygen storage tank 10 and the hydrogen storage tank 7.

[0123] SC4. Turn on the discharge switch S1 of the storage battery 6. After the storage battery 6 discharges, it forms an electrical circuit with the heating wire in the hot water storage tank 12. The Ohmic heat generated by the heating wire heats the water in the hot water storage tank 12 to provide hot water at different temperatures for users.

[0124] SC5. Open the valves V8 and V5. The hot water from SC4 exchanges heat with the heat exchanger 13 and is supplied to the generator of the absorption refrigeration device 14. The generated cooling capacity is supplied to the hydrogen storage tank 7 to maintain a low-temperature environment or supplied to users for food and medicine storage.

[0125] In the above combined heat and power supply method, the electric energy is mainly provided by the wind power generation device 1. However, it is affected by many factors such as the actual needs of users, seasons, and weather. Therefore, the operation method of the multi-energy combined supply system is adjusted according to the actual situation.

[0126] The content of SC1 is as follows:

[0127] SC11. When the power generation amount P of the wind power generation device 1 W is greater than or equal to the power consumption demand P of the system N (P W >P N ), preferentially store the excess part (P W - P N ) beyond the system power consumption in the storage battery 6.

[0128] SC12. When the charging of the storage battery 6 consumes power P B less than the remaining power in step SC11 (P W - P N ), converge and invert the remaining power (P W - P N - P B ) and connect it to the power grid 15.

[0129] SC13. When the power generation amount P of the wind power generation device 1 W is less than the power consumption demand P of the system N (P W <P N ), preferentially discharge the storage battery 6 to supplement the required power, and the supplementary power is P B .

[0130] SC14. When the storage battery 6 discharges to the discharge cut-off voltage and cannot continue to output electric energy to the system, and the power P supplemented by the storage battery 6 for the system B is less than the power required by the system, that is, P B <(P N - P W ), open the valve V1 to supply fuel hydrogen to the hydrogen internal combustion engine 5, and the hydrogen internal combustion engine 5 starts to supplement power for the system. The waste heat of the internal combustion engine is exchanged by circulating water to increase the hot water temperature and supply it to users.

[0131] SC15. When the combined supply system is arranged in areas with thin air such as plateaus, in step S14, the hydrogen internal combustion engine 5 has insufficient combustion due to the low oxygen content in the air, resulting in limited power generation. At this time, the valve V21 is opened to supply oxygen to the hydrogen internal combustion engine 5, further improving the power generation of the hydrogen internal combustion engine 5.

[0132] When there is poor solar irradiation or no radiation at night and the user has no multiple energy consumption requirements such as cold, heat, electricity, hydrogen, water, and oxygen, the steps are as follows:

[0133] SD1. Receive the dispatching instruction of the power grid 15, and the wind power generation device 1 generates electricity and directly accesses the grid.

[0134] SD2. When the power generation of the wind power generation device 1 has poor stability and does not meet the grid connection standard of the local area, that is, parameters such as voltage, frequency, phase, and power are not within the grid connection requirements. At this time, the battery 6 and the PEM water electrolysis hydrogen production device 3 charge / discharge / start, playing a role in tracking the output or suppressing fluctuations.

[0135] In the above step SC1, when the load of the power grid 15 is too large or the frequency is unstable, the battery 6, the hydrogen fuel cell 4, and the hydrogen internal combustion engine 5 form a hybrid energy storage system, which outputs electricity simultaneously after starting, playing roles in peak shaving, frequency modulation, and phase modulation.

[0136] The above-mentioned devices, the hydrogen internal combustion engine 5, the fuel cell, the photovoltaic-thermal component 2, and the battery 6 all generate waste heat during the working process and exchange heat with the system circulating water. According to the basic principle of "matching temperature and cascaded utilization", the operation method of the circulating water in the combined supply system is as follows:

[0137] Step S1. According to the heat source temperature, the circulating water in the circulating pipeline flows through the hydrogen internal combustion engine 5 (above 300 °C), the fuel cell (about 80 °C), the photovoltaic-thermal component 2 (30 - 70 °C), and the battery 6 (10 - 40 °C) in sequence.

[0138] Step S2. When the hydrogen internal combustion engine 5 is in the working state, open the valve V9 and the valve V10 and close the valve V11 to control the circulating water to flow through the main pipeline to exchange heat with the heat source. Otherwise, close the valve V9 and the valve V10 and open the valve V11 to control the circulating water to flow through the bypass pipeline.

[0139] Step S3. When the fuel cell is in the working state, open the valve V12 and the valve V13 and close the valve V14 to control the circulating water to flow through the main pipeline to exchange heat with the heat source. Otherwise, close the valve V12 and the valve V13 and open the valve V14 to control the circulating water to flow through the bypass pipeline.

[0140] Step S4: When the photovoltaic-thermal module 2 generates electricity, open valve V15 and valve V16 and close valve V17 to control the circulating water to flow through the back of the photovoltaic panels in the main pipeline for heat exchange. Otherwise, close valve V15 and valve V16 and open valve V17 to control the circulating water to flow through the bypass pipeline.

[0141] Step S5: When the battery 6 is in operation, open valve V18 and valve V19 and close valve V20 to control the circulating water to flow through the main pipeline for battery thermal management. Otherwise, close valve V18 and valve V19 and open valve V20 to control the circulating water to flow through the bypass pipeline.

[0142] Step S6: The circulating water is finally stored in the hot water storage tank 12. When the user has cooling or heating requirements, open valve V8. The water in the hot water storage tank 12 flows through the heat exchanger 13. After heat exchange is completed, open valve V7, and the circulating water flows back to the water storage tower 9 to achieve system circulation.

[0143] Therefore, the present invention adopts the above-mentioned cold-heat-electricity-hydrogen-water-oxygen combined supply system and operation method based on wind and light utilization. Aiming at the problems of limited energy utilization efficiency of traditional integrated energy systems, great difficulty in multi-level and multi-category energy supply, ineffective utilization of waste heat and by-products, and inability to adapt to areas such as plateaus, deserts, gobi, and wastelands, a comprehensive energy system that makes full use of wind and light resources and can realize synchronous supply of multiple types of heterogeneous energy is provided, which can effectively utilize resources, improve energy utilization efficiency, and effectively solve the problems of energy shortages such as water, heat, and oxygen in plateau and desert-gobi-wasteland areas.

[0144] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that they can still modify or equivalently replace the technical solutions of the present invention, and these modifications or equivalent replacements cannot make the modified technical solutions deviate from the spirit and scope of the technical solutions of the present invention.

Claims

1. A cold-heat-electricity-hydrogen-water-oxygen cogeneration system based on wind and solar power utilization, characterized in that: include: Wind power generation devices and photovoltaic thermal modules are used to provide electricity to the combined power system and the power grid; A storage battery connected to the photovoltaic thermal module and used to store the surplus power generated by the photovoltaic thermal module over the power used; PEM water electrolysis hydrogen production device, connected to the power grid, used to produce hydrogen and oxygen; A hydrogen fuel cell connected to a PEM water electrolysis hydrogen production device and a power grid to provide electrical energy; A hydrogen internal combustion engine connected to the power grid to provide electrical energy; A heat exchanger, connected to the hydrogen fuel cell, for exchanging heat with hot water; A refrigeration device is connected to the heat exchanger to generate cold.

2. The cold-heat-electricity-hydrogen-water-oxygen cogeneration system based on wind and solar power utilization according to claim 1 is characterized in that: Also includes: A hydrogen storage tank, connected to the PEM water electrolysis hydrogen production device, used to store hydrogen produced by the PEM water electrolysis hydrogen production device; A pump, connected to the hydrogen storage tank and the hydrogen fuel cell, for pumping hydrogen in the hydrogen storage tank into the hydrogen fuel cell; An oxygen storage tank is connected to the PEM water electrolysis hydrogen production device and the hydrogen internal combustion engine, and is used to store oxygen produced by the PEM water electrolysis hydrogen production device and provide oxygen to the hydrogen internal combustion engine; A hot water storage tank is connected to the battery and the heat exchanger and is used to provide hot water to the heat exchanger; Water storage tower, used to store the product water of hydrogen fuel cells.

3. The cold-heat-electricity-hydrogen-water-oxygen cogeneration system based on wind and solar power utilization according to claim 2 is characterized in that: It also includes a hydrogen load connected to the hydrogen storage tank, an oxygen load connected to the oxygen storage tank, and a valve.

4. The method for operating the cold-heat-electricity-hydrogen-water-oxygen cogeneration system based on wind and solar utilization as described in any one of claims 1 to 3 is characterized in that: Includes the following: When the solar radiation conditions are good and the user has multiple energy needs such as cooling, heating, electricity, hydrogen, water and oxygen, the photovoltaic thermal module receives solar radiation to generate electricity, and the electricity drives the hydrogen fuel cell and the PEM water electrolysis hydrogen production device to obtain hydrogen and oxygen, and the product water is collected into the circulating water pipeline; at the same time, the low-temperature liquid water in the water storage tower exchanges heat with the photovoltaic thermal module and is collected into the hydrogen fuel cell to obtain heat after drainage; hot water drives the absorption heat pump or obtains cold through electric refrigeration; when the user does not have multiple energy needs such as cooling, heating, electricity, hydrogen, water and oxygen, the electricity from the photovoltaic thermal module and the wind power generation device is directly transmitted to the power grid; When solar radiation is poor or there is no radiation at night, and users have multiple energy needs such as cooling, heating, electricity, hydrogen, water, and oxygen, the wind power generation device provides electricity to drive the hydrogen fuel cell and the PEM water electrolysis hydrogen production device to obtain hydrogen and oxygen, and the product water is merged into the circulating water pipeline; at the same time, heat supply is achieved by heating the circulating water with electric heating wires; hot water drives the absorption heat pump or electric refrigeration to obtain cooling; when users do not have multiple energy needs such as cooling, heating, electricity, hydrogen, water, and oxygen, the wind power generation device generates electricity directly and connects to the grid.

5. The method for operating the cold-heat-electricity-hydrogen-water-oxygen cogeneration system based on wind and solar power utilization according to claim 4 is characterized in that: When the solar radiation conditions are good and the user has multiple energy needs such as cooling, heating, electricity, hydrogen, water and oxygen, the steps are as follows: SA1. Photovoltaic thermal modules receive solar radiation and use the photovoltaic effect to generate clean electricity, with the power generated being supplied to users first; SA2, photovoltaic power generation drives the pump after inversion and voltage conversion, and the pump pumps hydrogen and air into the hydrogen fuel cell. The anode of the fuel cell produces an electrochemical reaction, releases charges and releases electrons to provide electrical energy; SA3, photovoltaic power generation drives the PEM water electrolysis hydrogen production device after inversion and voltage conversion. Water in the device undergoes electrolysis to produce oxygen and hydrogen, which are stored in oxygen storage tanks and hydrogen storage tanks respectively; SA4. Open the valve to allow the low-temperature water in the water storage tower to flow into the circulation pipeline. The heat generated by the photovoltaic thermal module during power generation is cooled by water, and the cooling water flows into the circulation water pipeline. During the operation of the hydrogen fuel cell, the heat of the bipolar plate is taken away by the product water, and the cooling water flows into the circulation water pipeline. The cooling water carries hot water below 80°C and is directly supplied to users. SA5, the hot water from the SA4 circulating water pipeline is supplied to the generator of the absorption refrigeration device for refrigeration after heat exchange with the heat exchanger.

6. The method for operating the cold-heat-electricity-hydrogen-water-oxygen cogeneration system based on wind and solar power utilization according to claim 5 is characterized in that: The SA1 steps are as follows: SA11, when the photovoltaic thermal module generates electricity P S Not less than the system power demand P N When the power consumption exceeds the system consumption, the battery will be stored first; SA12. After the battery is fully charged or fully charged, the battery charging power consumption P B , the photovoltaic thermal module power generation capacity P S After consumption, the remaining electricity is merged into the grid after being inverted; SA13, when the photovoltaic thermal module generates electricity P S Less than the system power demand P N When the battery discharge is used to replenish the required power, the replenished power is P B ; SA14: After the battery reaches the discharge cut-off voltage, it can no longer output power to the system. The amount of power P that the battery replenishes for the system B When P is less than the power required by the system, B <(P N -P S ), the wind power generation device will be used to supplement the system, and the supplementary power is P W ; SA15. When there is no wind and the wind power generation device has no output or the power generated by the wind power generation device needs to be supplied to the power grid first, the amount of electricity P supplemented by the wind power generation device to the system W When P is less than the power required by the system, W <(P N -P S -P B ), supplying hydrogen fuel to the hydrogen internal combustion engine, the hydrogen internal combustion engine starts to supplement the power supply for the system, and the waste heat of the internal combustion engine is increased by circulating water heat exchange to increase the temperature of hot water and supply it to users; SA16. When the combined supply system is arranged in areas with thin oxygen such as plateaus, the hydrogen internal combustion engine in SA15 will not burn completely due to the low oxygen content in the air. The valve of the pipe connecting the oxygen storage tank and the hydrogen internal combustion engine is opened to supply oxygen to the hydrogen internal combustion engine.

7. The method for operating the cold-heat-electricity-hydrogen-water-oxygen cogeneration system based on wind and solar power utilization according to claim 6 is characterized in that: When the solar radiation conditions are good and the user has no demand for cooling, heating, electricity, hydrogen, water, or oxygen, the steps are as follows: SB1. Receive grid dispatching instructions, and wind power generation devices and photovoltaic thermal components generate electricity directly to the grid; when the grid load is too large or the frequency is unstable, batteries, hydrogen fuel cells and hydrogen internal combustion engines form a hybrid energy storage system, which outputs electricity simultaneously after startup; SB2. When the power generation stability of wind power generation devices and photovoltaic thermal components is poor and does not meet the grid access standards in the area, the battery and PEM water electrolysis hydrogen production device are charged and discharged / started.

8. The method for operating the cold-heat-electricity-hydrogen-water-oxygen cogeneration system based on wind and solar power utilization according to claim 7 is characterized in that: When the solar radiation is poor or there is no radiation at night, and the user has multiple energy needs such as cooling, heating, electricity, hydrogen, water, and oxygen, the steps are as follows: SC1. Wind power generation devices generate clean electricity, and the electricity generated is supplied to users; SC2. The electricity generated by the wind power generation device drives the pump, which pumps hydrogen and air into the hydrogen fuel cell. The anode of the hydrogen fuel cell produces an electrochemical reaction, releases charges and releases electrons to provide electricity for users; the water discharged by the hydrogen fuel cell is stored in the water storage tower to provide clean fresh water for users; SC3, the electric energy generated by the wind power generation device drives the PEM water electrolysis hydrogen production device, and the water in the device undergoes electrolysis to produce oxygen and hydrogen, which are stored in the oxygen storage tank and the hydrogen storage tank respectively; SC4. Turn on the discharge switch of the battery. After the battery is discharged, it forms an electrical circuit with the heating wire in the hot water storage tank. The heating wire heats the water in the hot water storage tank to provide users with hot water of different temperatures. SC5 exchanges heat with the hot water from SC4 and supplies it to the generator of the absorption refrigeration device.

9. The method for operating the cold-heat-electricity-hydrogen-water-oxygen cogeneration system based on wind and solar power utilization according to claim 8 is characterized in that: The contents of SC1 are as follows: SC11. When the power generation capacity of the wind power generation device is P W Not less than the system power demand P N When the power consumption exceeds the system consumption, the battery will be stored first; SC12, battery charging, battery charging power consumption P B When the remaining power is less than that in step SC11, the remaining power is merged and inverted and then connected to the grid; SC13, when the wind power generation device generates electricity P W Less than the system power demand P N When the battery discharge is used to replenish the required power, the replenished power is P B ; SC14, the battery discharge reaches the discharge cut-off voltage and can no longer output power to the system and the battery replenishes the system with power P B When P is less than the power required by the system, B <(P N -P W ), supplying hydrogen fuel to the hydrogen internal combustion engine, the hydrogen internal combustion engine starts to supplement the power supply for the system, and the waste heat of the internal combustion engine is increased by circulating water heat exchange to increase the temperature of hot water and supply it to users; SC15. When the combined power supply system is arranged in an area with thin oxygen, such as a plateau, the hydrogen internal combustion engine in step SC14 will not burn sufficiently due to the low oxygen content in the air, and oxygen is supplied to the hydrogen internal combustion engine.

10. The method for operating the cold-heat-electricity-hydrogen-water-oxygen cogeneration system based on wind and solar power utilization according to claim 9 is characterized in that: When the solar radiation is poor or there is no radiation at night, and the user has no demand for cooling, heating, electricity, hydrogen, water, or oxygen, the steps are as follows: SD1, receiving grid dispatching instructions, wind power generation devices generate electricity directly to the grid. SD2. When the power generation stability of the wind power generation device is poor and does not meet the grid access standards in the area, the battery and PEM water electrolysis hydrogen production device are charged and discharged / started.

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