A multi-energy coupling system and method for passive building zero carbon emission

Abstract

The application belongs to the technical field of clean energy coupling for buildings, and solves the problem that existing passive buildings cannot completely get rid of the dependence on conventional commercial power. A multi-energy coupling system and method for zero-carbon emission of passive buildings are provided, which deeply couples a ground source heat pump unit, a wind-solar complementary power generation unit, a water electrolysis unit and a hydrogen-oxygen fuel cell. On one hand, the ground source heat pump unit supplies power for the electricity and heat units of the passive building, and on the other hand, the PLC control module realizes the switching of the refrigeration and heating functions of the ground source heat pump unit and the adjustment of the cold and hot medium temperatures to ensure the normal operation of the solid-state hydrogen storage unit and the hydrogen-oxygen fuel unit, thereby realizing the storage of the surplus electric energy generated by the wind-solar complementary power generation unit through the water electrolysis unit and the solid-state hydrogen storage unit. When the power generation capacity of the wind-solar complementary power generation unit cannot meet the normal electricity demand of the passive building, the hydrogen-oxygen fuel cell unit generates electricity as a supplement for the electricity of the passive building.

Description

Technical Field

[0001] This invention belongs to the field of clean energy coupling technology for buildings, specifically relating to a multi-energy coupling system and method for zero carbon emissions in passive buildings. Background Technology

[0002] Passive buildings refer to buildings that achieve high thermal insulation performance by using materials with high thermal insulation properties and doors and windows with low heat transfer coefficients, adopting optimized building construction practices, and utilizing clean energy and heat dissipation from household appliances to provide heat sources for the interior, reducing or eliminating the use of actively supplied energy, so as to achieve the building's temperature requirements. The goal is to achieve a good indoor environment of comfort without relying on active heating and cooling.

[0003] Passive buildings have already formed a certain industrial scale abroad, and ultra-low energy passive buildings have begun to be valued, researched, and practiced.

[0004] At present, most passive buildings in China use renewable energy sources such as solar and wind power to provide electricity for the buildings. However, due to the great intermittency and randomness of weather and day and night, passive buildings will have to use conventional grid power at night or under long-term windless and lightless conditions, which hinders the realization of the zero-carbon goal of passive buildings and greatly limits the promotion and application of passive buildings in remote mountainous areas, islands and other areas where grid power cannot be delivered. Summary of the Invention

[0005] To address the limitations of existing passive buildings in achieving zero-carbon emissions due to their reliance on conventional grid electricity, which restricts their applicability to certain regions, this invention aims to provide a multi-energy coupling system and method for achieving zero-carbon emissions in passive buildings. This system deeply couples a ground-source heat pump unit, a wind-solar hybrid power generation unit, a water electrolysis unit, and a hydrogen-oxygen fuel cell unit via a PLC control module. The ground-source heat pump unit supplies power to the passive building's electricity and heat consumption units while the PLC control module simultaneously switches between cooling and heating functions and regulates the temperatures of the cold and hot media to ensure the normal operation of the solid-state hydrogen storage unit and the hydrogen-oxygen fuel cell unit. Furthermore, surplus electricity generated by the wind-solar hybrid power generation unit is stored through the water electrolysis unit and the solid-state hydrogen storage unit. When the power output and quality of the wind-solar hybrid power generation unit cannot meet the normal electricity needs of the passive building, the hydrogen-oxygen fuel cell unit provides a supplementary source of electricity, allowing the passive building to completely eliminate its dependence on conventional grid electricity.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a multi-energy coupling system for zero carbon emissions in passive buildings, comprising a ground source heat pump unit, a wind-solar hybrid power generation unit, a water electrolysis unit, a hydrogen-oxygen fuel cell unit, and a PLC control module; the output of the wind-solar hybrid power generation unit is connected to the inputs of the water electrolysis unit, the ground source heat pump unit, and the passive building power consumption unit via a first inverter; the outlet of the water electrolysis unit is connected to the inlet of the solid hydrogen storage unit and the oxygen tank group; and the outlets of both the solid hydrogen storage unit and the oxygen tank group are connected to the hydrogen-oxygen fuel cell unit. At the inlet end, the output end of the hydrogen-oxygen fuel cell unit is connected to the input end of the ground source heat pump unit, the water electrolysis unit, and the passive building power unit via the second inverter; the ground source heat pump unit includes a first ground source heat pump unit for providing cooling medium for the hydrogen absorption process of the solid hydrogen storage unit and heating medium for the hydrogen release process, a second ground source heat pump unit for providing cooling medium for the hydrogen-oxygen fuel cell unit, and a third ground source heat pump unit for supplying energy to the passive building power and heat units; the ground source heat pump unit, the water electrolysis unit, and the hydrogen-oxygen fuel cell unit are all connected to the PLC control module.

[0007] Preferably, a first power meter for detecting power generation is installed at the output end of the wind-solar hybrid power generation unit, and a second power meter for detecting power consumption is installed at the total input end of the passive building power unit; a first water bath for heat exchange is provided between the first ground source heat pump unit and the solid-state hydrogen storage unit, and a second water bath for heat exchange is provided between the second ground source heat pump unit and the hydrogen-oxygen fuel cell unit; a first temperature sensor and a second temperature sensor are respectively installed in the first and second water baths; a fifth solenoid valve is installed on the pipeline between the first ground source heat pump unit and the first water bath, and the second ground source heat pump unit... A sixth solenoid valve is installed on the pipeline between the group and the second water bath; a first solenoid valve is installed on the pipeline between the water electrolysis unit and the solid hydrogen storage unit; a second solenoid valve is installed on the pipeline between the water electrolysis unit and the oxygen tank group; a third solenoid valve is installed on the pipeline between the solid hydrogen storage unit and the hydrogen-oxygen fuel cell unit; and a fourth solenoid valve is installed on the pipeline between the oxygen tank group and the hydrogen-oxygen fuel cell unit. The first power meter, the second power meter, the first temperature sensor, the second temperature sensor, the first solenoid valve, the second solenoid valve, the third solenoid valve, the fourth solenoid valve, the fifth solenoid valve, and the sixth solenoid valve are all connected to the PLC control module.

[0008] Preferably, the ground source heat pump unit further includes a heat pump heat exchange pipe connected to three ground source heat pump units, and a seventh solenoid valve is installed on the pipeline between the heat pump heat exchange pipe and the three ground source heat pump units. The seventh solenoid valve is connected to the PLC control module. The wind-solar hybrid power generation unit includes a wind power generation device and a photovoltaic power generation device arranged in parallel.

[0009] This invention also provides a multi-energy coupling method for zero-carbon emissions in passive buildings, comprising the following steps:

[0010] S1: Based on outdoor climate change, the system uses outdoor temperature sensors and power meters on electrical appliances to statistically analyze the hourly outdoor temperature, the number of electrical appliances used in the building, and the hourly power consumption throughout the year. It then fits the power prediction curves for achieving comfortable conditions in the building under different outdoor temperature conditions and time periods, and stores the results in the PLC control module.

[0011] If the real-time power generation uploaded by the first power meter is greater than the real-time power consumption uploaded by the second power meter, and the PLC control module compares the predicted power value of the first power meter with the predicted curve under the current outdoor temperature and power consumption conditions within the next time step t, if the predicted power value fluctuates above and below the real-time power generation value more than twice within the time step t, then proceed to step S2; if the predicted power value fluctuates above and below the real-time power generation value no more than twice within the time step t, then proceed to step S2, until the real-time power generation is less than the power consumption, then proceed to step S5.

[0012] If the uploaded real-time power generation is less than the power consumption, and the PLC control module compares the predicted power value of the first power meter with the predicted curve under the current outdoor temperature and power consumption conditions in real time within the next time step t, if the predicted power value fluctuates above and below the real-time power generation value more than twice within the time step t, then proceed to step S5; if the predicted power value fluctuates above and below the real-time power generation value no more than twice within the time step t, then proceed to step S5, until the real-time power generation is greater than the power consumption, then proceed to step S2.

[0013] S2: The PLC control module starts the cooling mode of the first ground source heat pump unit, shuts down the second ground source heat pump unit, and opens the fifth solenoid valve to realize heat exchange between the first ground source heat pump unit and the solid hydrogen storage unit.

[0014] S3: The PLC control module detects the first temperature value uploaded by the first temperature sensor and adjusts the opening of the fifth solenoid valve to control the first temperature value between 0℃ and 10℃.

[0015] S4: The PLC control module opens the first and second solenoid valves, and the PLC control module starts the water electrolysis unit to prepare hydrogen and oxygen. The hydrogen and oxygen produced in the water electrolysis unit are stored in the solid hydrogen storage unit and oxygen storage tank, respectively.

[0016] S5: The PLC control module starts the heating mode of the first ground source heat pump unit, starts the cooling mode of the second ground source heat pump unit, and opens the fifth and sixth solenoid valves to realize heat exchange between the first ground source heat pump unit and the solid hydrogen storage unit, and between the second ground source heat pump unit and the hydrogen-oxygen fuel cell unit.

[0017] S6: The PLC control module detects the first temperature value uploaded by the first temperature sensor and the second temperature value uploaded by the second temperature sensor. By adjusting the opening of the fifth solenoid valve and the sixth solenoid valve, the first temperature value is controlled between 60℃ and 80℃, and the second temperature value is controlled between 0℃ and 10℃.

[0018] S7: The PLC control module opens the third and fourth solenoid valves, allowing the hydrogen in the solid hydrogen storage unit and the oxygen in the oxygen storage tank to be input into the hydrogen-oxygen fuel cell unit. The PLC control module then starts the hydrogen-oxygen fuel cell unit to generate electricity.

[0019] Compared with the prior art, the beneficial effects of the present invention are:

[0020] 1. This invention creatively integrates a ground-source heat pump unit, a wind-solar hybrid power generation unit, a water electrolysis unit, and a hydrogen-oxygen fuel cell unit. While the ground-source heat pump unit supplies power to the passive building's electricity and heat consumption units, a PLC control module simultaneously switches between cooling and heating functions and regulates the temperature of the cold and hot media to ensure the normal operation of the solid-state hydrogen storage unit and the hydrogen-oxygen fuel cell unit. Furthermore, surplus electricity generated by the wind-solar hybrid power generation unit is stored through the water electrolysis unit and the solid-state hydrogen storage unit. When the power output and quality of the wind-solar hybrid power generation unit cannot meet the normal electricity needs of the passive building, the hydrogen-oxygen fuel cell unit provides a supplementary power source, allowing the passive building to completely break free from dependence on conventional grid electricity and achieve the goal of zero carbon emissions. This technology can then be extended to remote areas such as mountainous regions and islands where grid electricity cannot reach.

[0021] 2. This invention uses solid-state hydrogen storage technology. Compared with traditional high-pressure hydrogen storage, solid-state hydrogen storage has high capacity, does not require high pressure, has low noise, and no explosion hazard, which can ensure safety in civil buildings. At the same time, it can effectively avoid the environmental pollution problems caused by the recycling and disposal of traditional batteries.

[0022] 3. This invention uses actual system operation to fit power prediction curves for buildings to reach comfortable conditions under different outdoor temperature conditions and at different times. It optimizes the control module's control commands by comparing power generation and predicted power consumption within a certain time step, thereby achieving stable system operation. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a system diagram of this embodiment.

[0025] In the diagram: 1.1-First ground source heat pump unit; 1.2-Second ground source heat pump unit; 1.3-Third ground source heat pump unit; 1.4-Heat pump heat exchanger tube; 2.1-Wind power generation device; 2.2-Photovoltaic power generation device; 3-Water electrolysis unit; 4-Hydrogen-oxygen fuel cell unit; 5-PLC control module; 6.1-First inverter; 6.2-Second inverter; 7-Solid-state hydrogen storage unit; 8-Oxygen tank group; 10.1-First water bath; 10.2-Second water bath; 11.1-First temperature sensor; 11.2-Second temperature sensor; 12.1-First solenoid valve; 12.2-Second solenoid valve; 12.3-Third solenoid valve; 12.4-Fourth solenoid valve; 12.5-Fifth solenoid valve; 12.6-Sixth solenoid valve; 12.7-Seventh solenoid valve. Detailed Implementation

[0026] The technical solutions of the embodiments of the present invention will be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other implementation methods obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0027] It should be noted that the structures, proportions, sizes, etc., illustrated in the accompanying drawings of this specification are only used to complement the content disclosed in the specification for those skilled in the art to understand and read, and are not intended to limit the conditions under which the present invention can be implemented. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportional relationships, or adjustments to the size, without affecting the effects and objectives that the present invention can produce, should still fall within the scope of the technical content disclosed in the present invention. It should be noted that in this specification, relational terms such as "first" and "second" are only used to distinguish one entity from several other entities, and do not necessarily require or imply any such actual relationship or order between these entities.

[0028] This invention provides an embodiment:

[0029] like Figure 1As shown, a multi-energy coupling system for zero carbon emissions in passive buildings includes a ground source heat pump unit, a wind-solar hybrid power generation unit, a water electrolysis unit 3, a hydrogen-oxygen fuel cell unit 4, and a PLC control module.

[0030] The output of the wind-solar hybrid power generation unit is connected to the input of the water electrolysis unit 3, the ground source heat pump unit, and the passive building power unit via the first inverter 6.1. The outlet of the water electrolysis unit 3 is connected to the inlet of the solid hydrogen storage unit 7 and the oxygen tank group 8. The outlets of the solid hydrogen storage unit 7 and the oxygen tank group 8 are both connected to the inlet of the hydrogen-oxygen fuel cell unit 4. The output of the hydrogen-oxygen fuel cell unit 4 is connected to the input of the ground source heat pump unit, the water electrolysis unit 3, and the passive building power unit via the second inverter 6.2.

[0031] The ground source heat pump unit includes a first ground source heat pump unit 1.1 for providing a cooling medium for the hydrogen absorption process and a heating medium for the hydrogen release process of the solid hydrogen storage unit 7, a second ground source heat pump unit 1.2 for providing a cooling medium for the hydrogen-oxygen fuel cell unit 4, and a third ground source heat pump unit 1.3 for supplying energy to the passive building's electricity and heat consumption units. The passive building's electricity and heat consumption units specifically include the passive building's air conditioning system, heating system, and domestic hot water system, etc. The selection of the ground source heat pump unit is determined according to the cooling and heating loads of different systems.

[0032] The ground source heat pump unit, water electrolysis unit 3, and hydrogen-oxygen fuel cell unit 4 are all connected to the PLC control module.

[0033] The wind-solar hybrid power generation unit includes a wind power generation device 2.1 and a photovoltaic power generation device 2.2 connected in parallel. The specific structure for achieving complementary power generation is existing technology and will not be described in detail here. The output end of the wind-solar hybrid power generation unit is equipped with a first power meter for detecting power generation, and the total input end of the passive building power consumption unit is equipped with a second power meter for detecting power consumption. The power generation and power consumption are monitored in real time and communicate with the PLC control module in real time.

[0034] A first water bath 10.1 for heat exchange is provided between the first ground source heat pump unit 1.1 and the solid hydrogen storage unit 7. A second water bath 10.2 for heat exchange is provided between the second ground source heat pump unit 1.2 and the hydrogen-oxygen fuel cell unit 4. A first temperature sensor 11.1 and a second temperature sensor 11.2 are respectively installed in the first water bath 10.1 and the second water bath 10.2, which communicate in real time with the PLC control module. A fifth solenoid valve 12.5 is installed on the pipeline between the first ground source heat pump unit 1.1 and the first water bath 10.1, and a sixth solenoid valve 12.6 is installed on the pipeline between the second ground source heat pump unit 1.2 and the second water bath 10.2. The temperature of the first water bath 10.1 and the second water bath 10.2 is maintained within the set operating range by adjusting the opening degree of the solenoid valves.

[0035] The first water bath 10.1 consists of a stainless steel box with a thickness of ≥5mm, insulation material on the surface of the box, heat exchange medium pipelines on the heat pump unit side, heat exchange medium pipelines on the solid hydrogen storage unit side, temperature sensors, water pumps, etc. The heat exchange medium pipelines are made of copper pipes, and the heat exchange medium pipelines inside the water bath are made in the form of U-shaped coils with ribs installed on the surface of the coils, which are fixed inside the water bath by the ribs.

[0036] The second water bath 10.2 consists of a stainless steel box with a thickness of ≥5mm, insulation material on the surface of the box, heat exchange medium pipelines on the heat pump unit side and the hydrogen-oxygen fuel cell side, temperature sensors, water pumps, etc. The heat exchange medium pipelines are made of copper pipes. The heat exchange medium pipelines inside the water bath are made in the form of U-shaped coils, with ribs installed on the surface of the coils, which are fixed inside the water bath by the ribs.

[0037] A first solenoid valve 12.1 is installed on the pipeline between the water electrolysis unit 3 and the solid hydrogen storage unit 7; a second solenoid valve 12.2 is installed on the pipeline between the water electrolysis unit 3 and the oxygen tank group 8; a third solenoid valve 12.3 is installed on the pipeline between the solid hydrogen storage unit 7 and the hydrogen-oxygen fuel cell unit 4; and a fourth solenoid valve 12.4 is installed on the pipeline between the oxygen tank group 8 and the hydrogen-oxygen fuel cell unit 4.

[0038] The ground source heat pump unit also includes a heat pump heat exchange pipe 1.4 connected to three ground source heat pump units. A seventh solenoid valve 12.7 is installed on the pipeline between the heat pump heat exchange pipe 1.4 and the three ground source heat pump units. The first solenoid valve 12.1, the second solenoid valve 12.2, the third solenoid valve 12.3, the fourth solenoid valve 12.4, the fifth solenoid valve 12.5, the sixth solenoid valve 12.6 and the seventh solenoid valve 12.7 are all solenoid valves with adjustable opening degree. The opening degree of the solenoid valves is controlled by a PLC control module, using a PID control algorithm.

[0039] This invention also provides a multi-energy coupling method for zero-carbon emissions in passive buildings, comprising the following steps:

[0040] S1: Based on outdoor climate change, the system uses outdoor temperature sensors and power meters on electrical appliances to statistically analyze the hourly outdoor temperature, the number of electrical appliances used in the building, and the hourly power consumption throughout the year. It then fits the power prediction curves for achieving comfortable conditions in the building under different outdoor temperature conditions and time periods, and stores the results in the PLC control module.

[0041] If the real-time power generation uploaded by the first power meter is greater than the real-time power consumption uploaded by the second power meter, and the PLC control module compares the predicted power value of the first power meter with the predicted curve under the current outdoor temperature and power consumption conditions within the next time step of 5 minutes, if the predicted power value fluctuates above and below the real-time power generation value more than twice within the time step of 5 minutes, then proceed to step S2; if the predicted power value fluctuates above and below the real-time power generation value no more than twice within the time step of 5 minutes, then proceed to step S2, until the real-time power generation is less than the power consumption, then proceed to step S5.

[0042] If the uploaded real-time power generation is less than the power consumption, and the PLC control module compares the predicted power value of the first power meter with the predicted curve under the current outdoor temperature and power consumption conditions within the next time step of 5 minutes, if the predicted power value fluctuates above and below the real-time power generation value more than twice within the time step of 5 minutes, then proceed to step S5; if the predicted power value fluctuates above and below the real-time power generation value no more than twice within the time step of 5 minutes, then proceed to step S5, until the real-time power generation is greater than the power consumption, then proceed to step S2.

[0043] Based on the hourly outdoor temperature, the number of electrical appliances used, and the power consumption of electrical appliances, a power prediction curve P=f(T, p, n) is fitted to predict the building's comfort conditions under different outdoor temperature conditions and time periods. By selecting the appropriate curve for different on-site conditions, the system is controlled according to the control rules to avoid frequent system start-ups and shutdowns.

[0044] S2: The PLC control module starts the cooling mode of the first ground source heat pump unit 1.1, shuts down the second ground source heat pump unit 1.2, and opens the fifth solenoid valve 12.5 to realize heat exchange between the first ground source heat pump unit 1.1 and the solid hydrogen storage unit 7.

[0045] S2: The PLC control module starts the cooling mode of the first ground source heat pump unit 1.1, shuts down the second ground source heat pump unit 1.2, and opens the fifth solenoid valve 12.5 to realize heat exchange between the first ground source heat pump unit 1.1 and the solid hydrogen storage unit 7.

[0046] S3: The PLC control module detects the first temperature value uploaded by the first temperature sensor 11.1 and adjusts the opening of the fifth solenoid valve 12.5 to make the first temperature value range between 0℃ and 10℃, so as to provide a cooling medium for the hydrogen absorption process of the solid hydrogen storage unit 7.

[0047] S4: The PLC control module opens the first solenoid valve 12.1 and the second solenoid valve 12.2. The PLC control module starts the water electrolysis unit 3 to prepare hydrogen and oxygen. The hydrogen and oxygen produced in the water electrolysis unit 3 are stored in the solid hydrogen storage unit 7 and the oxygen storage tank 8, respectively.

[0048] S5: The PLC control module starts the heating mode of the first ground source heat pump unit 1.1, starts the cooling mode of the second ground source heat pump unit 1.2, and opens the fifth solenoid valve 12.5 and the sixth solenoid valve 12.6 to realize the heat exchange between the first ground source heat pump unit 1.1 and the solid hydrogen storage unit 7, and between the second ground source heat pump unit 1.2 and the hydrogen-oxygen fuel cell unit 4.

[0049] S6: The PLC control module detects the first temperature value uploaded by the first temperature sensor 11.1 and the second temperature value uploaded by the second temperature sensor. By adjusting the opening of the fifth solenoid valve 12.5 and the sixth solenoid valve 12.6, the first temperature value is kept between 60℃ and 80℃ to provide a heating medium for the hydrogen release process of the solid hydrogen storage unit 7, and the second temperature value is kept between 0℃ and 10℃ to provide a cooling medium for the hydrogen-oxygen fuel cell unit 4.

[0050] S7: The PLC control module opens the third solenoid valve 12.3 and the fourth solenoid valve 12.4, so that the hydrogen in the solid hydrogen storage unit 7 and the oxygen in the oxygen storage tank 8 are input into the hydrogen-oxygen fuel cell unit 4, and the PLC control module starts the hydrogen-oxygen fuel cell unit 4 to generate electricity.

[0051] This invention creatively integrates a ground-source heat pump unit, a wind-solar hybrid power generation unit, a water electrolysis unit, and a hydrogen-oxygen fuel cell unit. While the ground-source heat pump unit supplies power to the passive building's electricity and heat consumption units, a PLC control module simultaneously switches between cooling and heating functions and regulates the temperature of the cold and hot media to ensure the normal operation of the solid-state hydrogen storage unit and the hydrogen-oxygen fuel cell unit. Furthermore, surplus electricity generated by the wind-solar hybrid power generation unit is stored through the water electrolysis unit and the solid-state hydrogen storage unit. When the power output and quality of the wind-solar hybrid power generation unit cannot meet the normal electricity needs of the passive building, the hydrogen-oxygen fuel cell unit provides a supplementary power source, allowing the passive building to completely break free from dependence on conventional grid electricity and achieve the goal of zero carbon emissions. This technology can then be extended to remote areas such as mountainous regions and islands where grid electricity cannot reach.

[0052] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A multi-energy coupling method for zero-carbon emissions in passive buildings, characterized in that: The multi-energy coupling system includes a ground source heat pump unit, a wind-solar hybrid power generation unit, a water electrolysis unit (3), a hydrogen-oxygen fuel cell unit (4), and a PLC control module; The output of the wind-solar hybrid power generation unit is connected to the input of the water electrolysis unit (3), the ground source heat pump unit and the passive building power unit via the first inverter (6.1). The outlet of the water electrolysis unit (3) is connected to the inlet of the solid hydrogen storage unit (7) and the oxygen tank group (8). The outlets of the solid hydrogen storage unit (7) and the oxygen tank group (8) are both connected to the inlet of the hydrogen-oxygen fuel cell unit (4). The output of the hydrogen-oxygen fuel cell unit (4) is connected to the input of the ground source heat pump unit, the water electrolysis unit (3) and the passive building power unit via the second inverter (6.2). The ground source heat pump unit includes a first ground source heat pump unit (1.1) for providing a cooling medium for the hydrogen absorption process and a heating medium for the hydrogen release process of the solid hydrogen storage unit (7), a second ground source heat pump unit (1.2) for providing a cooling medium for the hydrogen-oxygen fuel cell unit (4), and a third ground source heat pump unit (1.3) for supplying energy to the passive building's electricity and heat consumption units; the ground source heat pump unit, the water electrolysis unit (3), and the hydrogen-oxygen fuel cell unit (4) are all connected to the PLC control module; The output end of the wind-solar hybrid power generation unit is equipped with a first power meter for detecting power generation, and the total input end of the passive building power unit is equipped with a second power meter for detecting power consumption. A first water bath (10.1) for heat exchange is provided between the first ground source heat pump unit (1.1) and the solid hydrogen storage unit (7), and a second water bath (10.2) for heat exchange is provided between the second ground source heat pump unit (1.2) and the hydrogen-oxygen fuel cell unit (4). A first temperature sensor (11.1) and a second temperature sensor (11.2) are respectively provided in the first water bath (10.1) and the second water bath (10.2). A fifth solenoid valve (12.5) is provided on the pipeline between the first ground source heat pump unit (1.1) and the first water bath (10.1), and a pipeline between the second ground source heat pump unit (1.2) and the second water bath (10.2) is provided. A sixth solenoid valve (12.6) is installed on the upper part; a first solenoid valve (12.1) is installed on the pipeline between the water electrolysis unit (3) and the solid hydrogen storage unit (7); a second solenoid valve (12.2) is installed on the pipeline between the water electrolysis unit (3) and the oxygen tank group (8); a third solenoid valve (12.3) is installed on the pipeline between the solid hydrogen storage unit (7) and the hydrogen-oxygen fuel cell unit (4); and a fourth solenoid valve (12.4) is installed on the pipeline between the oxygen tank group (8) and the hydrogen-oxygen fuel cell unit (4); a first power meter, a second power meter, a first temperature sensor (11.1), a second temperature sensor (11.2), a first solenoid valve (12.1), a second solenoid valve (12.2), a third solenoid valve (12.3), a fourth solenoid valve (12.4), a fifth solenoid valve (12.5), and a sixth solenoid valve (12.6) are all connected to the PLC control module; The multi-energy coupling method is implemented based on the above-mentioned multi-energy coupling system and includes the following steps: S1: Based on outdoor climate change, the system uses outdoor temperature sensors and power meters on electrical appliances to statistically analyze the hourly outdoor temperature, the number of electrical appliances used in the building, and the hourly power consumption throughout the year. It then fits the power prediction curves for the building to reach comfortable conditions under different outdoor temperature conditions and time periods, and stores them in the PLC control module. If the real-time power generation uploaded by the first power meter is greater than or equal to the real-time power consumption uploaded by the second power meter, and the PLC control module compares the predicted power value of the first power meter with the predicted curve under the current outdoor temperature and power consumption conditions within the next time step t, if the predicted power value fluctuates above and below the real-time power generation value more than twice within the time step t, then proceed to step S2; if the predicted power value fluctuates above and below the real-time power generation value no more than twice within the time step t, then proceed to step S2, until the real-time power generation is less than the power consumption, then proceed to step S5. If the uploaded real-time power generation is less than the power consumption, and the PLC control module compares the predicted power value of the first power meter with the predicted curve under the current outdoor temperature and power consumption conditions in real time within the next time step t, if the predicted power value fluctuates above and below the real-time power generation value more than twice within the time step t, then proceed to step S5; if the predicted power value fluctuates above and below the real-time power generation value no more than twice within the time step t, then proceed to step S5, until the real-time power generation is greater than the power consumption, then proceed to step S2. S2: The PLC control module starts the cooling mode of the first ground source heat pump unit (1.1), shuts down the second ground source heat pump unit (1.2), and opens the fifth solenoid valve (12.5) to realize heat exchange between the first ground source heat pump unit (1.1) and the solid hydrogen storage unit (7); S3: The PLC control module detects the first temperature value uploaded by the first temperature sensor (11.1) and adjusts the opening of the fifth solenoid valve (12.5) to make the range of the first temperature value between 0℃ and 10℃. S4: The PLC control module opens the first solenoid valve (12.1) and the second solenoid valve (12.2). The PLC control module starts the water electrolysis unit (3) to prepare hydrogen and oxygen. The hydrogen and oxygen produced in the water electrolysis unit (3) are stored in the solid hydrogen storage unit (7) and the oxygen tank group (8), respectively. S5: The PLC control module starts the heating mode of the first ground source heat pump unit (1.1), starts the cooling mode of the second ground source heat pump unit (1.2), and opens the fifth solenoid valve (12.5) and the sixth solenoid valve (12.6) to realize the heat exchange between the first ground source heat pump unit (1.1) and the solid hydrogen storage unit (7), and between the second ground source heat pump unit (1.2) and the hydrogen-oxygen fuel cell unit (4); S6: The PLC control module detects the first temperature value uploaded by the first temperature sensor (11.1) and the second temperature value uploaded by the second temperature sensor. By adjusting the opening of the fifth solenoid valve (12.5) and the sixth solenoid valve (12.6), the first temperature value is between 60℃ and 80℃, and the second temperature value is between 0℃ and 10℃. S7: The PLC control module opens the third solenoid valve (12.3) and the fourth solenoid valve (12.4), so that the hydrogen in the solid hydrogen storage unit (7) and the oxygen in the oxygen tank group (8) are input into the hydrogen-oxygen fuel cell unit (4), and the PLC control module starts the hydrogen-oxygen fuel cell unit (4) to generate electricity.

2. The multi-energy coupling method for zero carbon emissions in passive buildings according to claim 1, characterized in that: The ground source heat pump unit also includes a heat pump heat exchange pipe (1.4) connected to three ground source heat pump units. A seventh solenoid valve (12.7) is installed on the pipeline between the heat pump heat exchange pipe (1.4) and the three ground source heat pump units. The seventh solenoid valve (12.7) is connected to the PLC control module. The wind-solar hybrid power generation unit includes a wind power generation device (2.1) and a photovoltaic power generation device (2.2) connected in parallel.

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