Wind-solar-storage-direct-flexible building energy system combined with geothermal energy

Abstract

The present application relates to the technical field of building energy systems, and discloses a wind-solar-storage-direct-flexible building energy system combined with geothermal energy, which comprises an electricity generating system, a refrigeration and heating subsystem and a water storage subsystem, the electricity generating system comprises a photovoltaic device, a fan device, an energy storage system, a battery and a vehicle-to-grid interaction system; the photovoltaic device is connected with a direct-current bus, direct-current electricity generated by the photovoltaic device is used to supply power to building loads through the direct-current bus, when the power generation amount of the direct-current electricity is more than the power supply demand amount of the building loads, the direct-current electricity is stored in the energy storage system or the battery or the vehicle-to-grid interaction system or connected with the power grid through an inverter at the same time; the refrigeration and heating subsystem comprises a shallow geothermal system and an air conditioning system, the shallow geothermal system guides the ground surface air inside the building to carry out refrigeration or heating, and forms internal fresh air; the water storage subsystem comprises a hot water storage device, a heat exchanger and a cold water storage device, and the hot water storage device and the cold water storage device are connected through a circulating pipeline.

Description

Technical Field

[0001] This invention patent relates to the technical field of building energy systems, and more specifically, to a building energy system that combines geothermal energy with wind, solar, energy storage, direct current, and flexible energy sources. Background Technology

[0002] According to statistics, the energy consumption of buildings throughout the entire process accounts for 45% of the country's total energy consumption, and carbon emissions account for 50.6% of the country's total emissions. Reducing building energy consumption and carbon emissions, and transitioning and upgrading high-energy-consuming buildings to low-energy-consuming, zero-energy-consuming, and energy-producing buildings has become an urgent task.

[0003] In existing building energy conservation and functional technologies, primary energy sources such as wind, solar, and air energy are commonly used to provide energy to buildings. Functional systems are composed of photovoltaic / solar thermal (PV / T) photovoltaic effects, wind power generation technology, heat pump / air conditioning technology, etc., to supply buildings with different types and qualities of energy such as electricity, heat, and cooling.

[0004] Current building energy systems suffer from several drawbacks. The stability and continuity of clean energy supply are significantly affected by the intermittency and volatility of wind power and PV / T (photovoltaic power generation). Building cooling and heating rely heavily on air conditioning systems, necessitating energy consumption optimization. Furthermore, buildings commonly utilize AC power grids, resulting in substantial reactive power losses during photovoltaic inversion and in the distribution network, requiring further optimization for energy conservation. The rapid proliferation of new energy vehicles within buildings also competes with the power grid for load, posing a challenge to grid stability.

[0005] In conclusion, how to solve the supply problems of building energy systems in a stable, low-cost, and tailored manner, and how to optimize the allocation of energy for energy-consuming equipment within buildings, have become urgent issues to be addressed. To effectively solve these problems, the industry has been actively exploring ways to reduce building energy consumption and improve the utilization rate of new energy sources.

[0006] For example, Chinese invention patent with publication number CN116111946A innovatively proposes a wind-solar-thermal-storage direct-flexible energy-producing building energy system. This building energy system combines renewable energy sources such as wind and solar power with energy-producing building materials, and is equipped with energy storage and thermal storage devices to construct energy-producing buildings and zero-carbon buildings, thereby achieving energy self-sufficiency.

[0007] For example, Chinese invention patent with publication number CN116191552A proposes a flexible energy storage and production capacity building energy system for wind power, photovoltaic power, solar thermal power, and geothermal power. This building energy system not only significantly improves the utilization rate of solar energy, but also enriches the energy acquisition channels through the efficient utilization of wind energy and geothermal energy, helping to achieve the goal of zero-carbon buildings and providing new ideas for the diversification and decarbonization of building energy supply.

[0008] Chinese invention patent CN217240395U describes a shared building energy system that integrates photovoltaic modules, energy storage batteries, and shared charging parking spaces. This building energy system improves the local consumption capacity of photovoltaic power generation while effectively reducing energy transmission losses, and increases the building's charging revenue through shared charging parking spaces.

[0009] Existing building energy systems have the following drawbacks:

[0010] 1) Highly dependent on weather conditions, resulting in low energy supply security and stability;

[0011] 2) The building energy system has a single energy storage method, which is only equipped with fixed-energy battery storage and lacks energy storage flexibility;

[0012] 3) When the temperature is low and the wind and light conditions are poor, the building energy system faces challenges in stabilizing energy use, and the overall heat recovery and utilization is insufficient;

[0013] 4) Building energy systems aim for low energy consumption, but they do not make sufficient use of primary energy around the building, and it is difficult for buildings to transition and upgrade from low-energy-consuming buildings to high-energy-consuming buildings. Summary of the Invention

[0014] The purpose of this invention is to provide a building energy system that combines geothermal energy with wind, solar, energy storage, direct current, and flexible energy supply, aiming to solve the problem of low energy supply security and stability in existing building energy systems.

[0015] The present invention is implemented as follows: a wind-solar-storage-direct-flexible building energy system combining geothermal energy, including a power generation subsystem, a cooling and heating subsystem, and a water storage subsystem. The power generation subsystem includes a photovoltaic device installed outside the building that converts light energy into electrical energy, a wind turbine device that converts wind energy into electrical energy, an energy storage system arranged inside the building, a battery, and a vehicle-to-grid (V2G) interaction system.

[0016] The photovoltaic device is connected to a DC bus, which is electrically connected to the building load, energy storage system, battery, vehicle-to-grid (V2G) system, and power grid. The DC power generated by the photovoltaic device supplies power to the building load through the DC bus. When the DC power generation exceeds the power demand of the building load, the DC power is simultaneously stored in the energy storage system, battery, V2G system, or connected to the power grid through an inverter.

[0017] The cooling and heating subsystem includes a shallow geothermal system and an air conditioning system. The shallow geothermal system introduces surface air from inside the building for cooling or heating to create fresh air inside. The air conditioning system cools or heats the air inside the building.

[0018] The water storage subsystem includes a hot water storage device, a heat exchanger, and a cold water storage device. The hot water storage device and the cold water storage device are connected by a circulation pipeline. Cold water in the cold water storage device absorbs heat and forms hot water after passing through the circulation pipeline. The hot water is stored in the hot water storage device. The heat exchanger is connected to the hot water storage device. The hot water exchanges heat through the heat exchanger to form cold water, which is then stored in the cold water storage device.

[0019] Furthermore, the wind turbine is connected to an inverter, and the electrical energy generated by the wind turbine is inverted by the inverter and connected to the power grid.

[0020] Furthermore, the photovoltaic device is located on the top of the building, and the wind turbine is located on the exterior of the building.

[0021] Furthermore, when the amount of DC power generated exceeds the power demand of the building load, the DC power is stored in the energy storage system, battery, vehicle-to-grid system, and then inverted and connected to the power grid via an inverter, according to priority.

[0022] Furthermore, the water storage subsystem includes a collection device connected to a circulation pipeline. The collection device collects external rainfall or snowfall and converts the rainfall or snowfall into circulating water, which then enters the circulation pipeline.

[0023] Furthermore, the circulation pipeline passes through the photovoltaic device, the energy storage system, and the battery, respectively. The cold water flowing out of the cold water storage device exchanges heat in the photovoltaic device, the energy storage system, and the battery, respectively, to form hot water flowing to the hot water storage device.

[0024] Furthermore, the vehicle-to-everything (V2X) system includes a charging gun, through which the circulation pipe passes, and where the cold water in the circulation pipe undergoes heat exchange.

[0025] Furthermore, the shallow geothermal system includes buried pipes connected to a heat exchanger. When the building interior is at a high temperature, the surface air inside the building is introduced into the shallow geothermal system through the buried pipes for cooling, the heat exchanger is closed, and the cooled interior fresh air is discharged into the building. When the building interior is at a low temperature, the surface air inside the building is introduced into the shallow geothermal system through the buried pipes for heat exchange, the heat exchanger is opened, and the heat-exchanged interior fresh air is discharged into the building.

[0026] Furthermore, the hot water in the hot water storage device generates heat through a heat exchanger, and the heat heats the interior air inside the building.

[0027] Compared with existing technologies ， The building energy system combining geothermal energy, wind, solar, energy storage, direct current, and flexible energy provided by this invention has the following advantages:

[0028] 1) To address the intermittent and fluctuating nature of photovoltaic power generation, wind turbines were added to ensure a more stable power supply to buildings and reduce the impact of climate and geographical location on the stability of the system's power supply.

[0029] 2) A shallow geothermal system has been added to improve cooling and heating capacity and reduce building energy consumption. At high temperatures, the shallow geothermal system introduces surface air underground for cooling, then sends the cooled internal fresh air into the building and exhausts the hot air inside the building. At low temperatures, the system introduces low-temperature surface air underground for preheating, then sends the hot internal fresh air into the building. This reduces the energy consumption of cooling and heating equipment and avoids the need for air conditioning systems during transitional seasons.

[0030] 3) In response to the fluctuations, intermittent and unstable characteristics of photovoltaic and wind turbine devices and the phenomenon of wind and solar curtailment during grid-connected power generation, batteries, internal energy storage systems and vehicle-to-grid interaction systems have been added. While smoothing out the fluctuations in wind and solar power generation, they also play a role in regulating the working status of the power grid.

[0031] 4) Clean energy power generation, all using DC power supply. In response to the problem of the limited availability of DC load equipment in buildings, the system forms a DC microgrid to invert excess electricity to the grid, realizing the transformation and upgrading of low-energy buildings to high-energy buildings.

[0032] 5) In response to the limited energy utilization and weak coupling of traditional combined heat and power systems, the cold water from the cold water storage device is fed into the circulation pipeline and absorbs heat to form hot water stored in the hot water storage device, thus achieving efficient energy utilization and enabling it to be used for cooling and heating. Attached Figure Description

[0033] Figure 1 This is a schematic diagram of the wind, solar, energy storage, direct current, and flexible building energy system that combines geothermal energy, provided by the present invention.

[0034] Figure 2 This invention provides an operational scheme diagram for buildings with internal cooling, heating, and electricity needs, which can be supplied independently by photovoltaic devices and energy storage systems.

[0035] Figure 3 This invention provides an operational scheme diagram for buildings that have cooling, heating, and electricity needs, but which cannot be supplied by photovoltaic devices and energy storage systems alone. Detailed Implementation

[0036] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0037] The implementation of the present invention will be described in detail below with reference to specific embodiments.

[0038] In the accompanying drawings of this embodiment, the same or similar reference numerals correspond to the same or similar components. In the description of this invention, it should be understood that if terms such as "upper," "lower," "left," and "right" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, they are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the accompanying drawings are only for illustrative purposes and should not be construed as limiting this patent. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0039] Reference Figure 1-3 The image shows a preferred embodiment of the present invention.

[0040] A building energy system combining geothermal energy, wind, solar, storage, direct current, and flexible energy sources includes a power generation subsystem, a cooling and heating subsystem, and a water storage subsystem. The power generation subsystem includes a photovoltaic device 1 (PV / T) installed outside the building that converts solar energy into electrical energy, a wind turbine device 2 that converts wind energy into electrical energy, an energy storage system 6 arranged inside the building, a battery, and a vehicle-to-grid (V2G) interaction system 5.

[0041] The photovoltaic device 1 is connected to the DC bus 3. The DC bus 3 is electrically connected to the building load 7, the energy storage system 6, the battery, the vehicle-to-grid interaction system 5, and the power grid 14. The DC power generated by the photovoltaic device 1 supplies power to the building load 7 through the DC bus 3. When the DC power generation exceeds the power supply demand of the building load 7, the DC power is simultaneously stored in the energy storage system 6 or the battery 8 or the vehicle-to-grid interaction system 5 or connected to the power grid 14 through an inverter.

[0042] The cooling and heating subsystem includes a shallow geothermal system 13 and an air conditioning system 4. The shallow geothermal system 13 introduces surface air from inside the building for cooling or heating to form fresh air inside the building. The air conditioning system 4 cools or heats the air inside the building.

[0043] The water storage subsystem includes a hot water storage device 9, a heat exchanger 11, and a cold water storage device 12. The hot water storage device 9 and the cold water storage device 12 are connected by a circulation pipeline. After the cold water in the cold water storage device 12 passes through the circulation pipeline, it absorbs heat to form hot water, which is stored in the hot water storage device 9. The heat exchanger 11 is connected to the hot water storage device 9. The hot water exchanges heat through the heat exchanger 11 to form cold water, which is stored in the cold water storage device 12.

[0044] The aforementioned building energy system combining geothermal energy with wind, solar, energy storage, direct current, and flexible energy has the following advantages:

[0045] 1) To address the intermittent and fluctuating power generation of photovoltaic device 1, wind turbine device 2 was added to generate electricity, ensuring a more stable power supply to the building and reducing the impact of climate and geographical location on the stability of the system's power supply.

[0046] 2) A shallow geothermal system 13 is added to improve the cooling and heating capacity and reduce building energy consumption. At high temperatures, the shallow geothermal system 13 introduces surface air into the ground for cooling, sends the cooled internal fresh air into the building, and exhausts the high-temperature air inside the building. At low temperatures, the low-temperature surface air is introduced into the ground for preheating, and the high-temperature internal fresh air is sent into the building. This can reduce the energy consumption of cooling and heating equipment and avoid the use of the air conditioning system 4 during transitional seasons.

[0047] 3) In response to the fluctuation, intermittency, and instability characteristics of photovoltaic device 1 and wind turbine device 2, as well as the phenomenon of wind and solar curtailment during grid-connected power generation, a battery, an internal energy storage system 6, and a vehicle-to-grid interaction system 5 were added. While smoothing the fluctuations in wind and solar power generation, they also have the function of regulating the working state of the power grid 14.

[0048] 4) Clean energy power generation, all using DC power supply. In response to the problem of the limited availability of DC load equipment in buildings, the system forms a DC microgrid to invert excess electricity to the grid, realizing the transformation and upgrading of low-energy buildings to high-energy buildings.

[0049] 5) In view of the limited energy utilization and weak coupling of traditional combined heat and power systems, the cold water of the cold water storage device 12 is fed into the circulation pipeline and absorbs heat to form hot water stored in the hot water storage device 9, thereby realizing the efficient utilization of energy and can be used for cooling and heating.

[0050] In this embodiment, the wind turbine 2 is connected to the inverter, and the electrical energy generated by the wind turbine 2 is inverted by the inverter and connected to the power grid 14.

[0051] In this embodiment, the photovoltaic device 1 is arranged on the top of the building to facilitate the absorption of light energy for power generation, while the wind turbine device 2 is arranged on the outside of the building.

[0052] In this embodiment, the water storage subsystem includes a collection device connected to a circulation pipeline. The collection device collects external rainfall or snowfall and converts the rainfall or snowfall into circulating water, which then enters the circulation pipeline.

[0053] In this embodiment, when the amount of DC power generated exceeds the power supply demand of the building load 7, the DC power is stored in the energy storage system 6, the battery 8, the vehicle-to-grid interaction system 5, and the grid 14 via inverter, according to priority.

[0054] When the power generation exceeds the building's power demand, the remaining power is stored in the building's energy storage system 6 first. When the energy storage system 6 reaches its maximum capacity and there is still remaining power, the vehicle's internal battery is used as an energy storage device through the vehicle-to-grid interaction system 5. If there is still remaining power, it is considered to store it in the building's external battery. Finally, the excess power is inverted and connected to the grid.

[0055] The circulating water in the circulation pipeline exchanges heat in the following order: photovoltaic device 1, charging gun of vehicle-to-grid interaction system 5, energy storage system 6 inside the building, and battery. The hot water after heat exchange is stored in the hot water storage device 9.

[0056] When the power generation cannot meet the building's electricity demand, the energy is released to supply power in the order of the building's internal energy storage system 6, the building's external battery, and the vehicle-to-grid interaction system 5. At the same time, the circulating water is heat-exchanged in the order of the photovoltaic device 1, the charging gun of the vehicle-to-grid interaction system 5, the building's internal energy storage system 6, and the battery, and stored in the hot water storage device 9. When the power generation of the photovoltaic device 1 and the wind turbine device 2 and all the energy storage facilities are still unable to meet the system's electricity demand, the power of the grid 14 is utilized.

[0057] In this embodiment, the circulation pipeline passes through the photovoltaic device 1, the energy storage system 6 and the battery respectively. The cold water flowing out of the cold water storage device 12 exchanges heat in the photovoltaic device 1, the energy storage system 6 and the battery respectively to form hot water flowing to the hot water storage device 9.

[0058] In this embodiment, the vehicle-to-everything (V2X) system 5 has a charging gun, and a circulation pipe passes through the charging gun, where cold water in the circulation pipe undergoes heat exchange.

[0059] In this embodiment, the shallow geothermal system 13 includes a buried pipe that is connected to the heat exchanger 11. When the interior of the building is in a high-temperature state, the surface air inside the building is introduced into the shallow geothermal system 13 through the buried pipe for cooling. The heat exchanger 11 is closed, and the cooled interior fresh air is discharged into the building.

[0060] When the interior of the building is at a low temperature, the surface air inside the building is introduced into the shallow geothermal system 13 through buried pipes for heat exchange. The heat exchanger 11 is opened, and the heat-exchanged fresh air is discharged into the building.

[0061] In this embodiment, the hot water in the hot water storage device 9 generates heat through heat exchanger 11, and the heat heats the internal air inside the building.

[0062] In this embodiment, the operation method of the building energy system combining geothermal energy, wind, solar, energy storage, direct current, and flexible energy is as follows:

[0063] 1) The building has cooling, heating, and electricity needs, good lighting conditions, and stable photovoltaic and solar thermal power generation and heat production;

[0064] Step S1: Photovoltaic device 1 generates clean electricity using solar radiation, and the generated electricity is preferentially fed into DC bus 3 to supply the building load 7 inside the building;

[0065] Step S2: Open valve V1, and the cold water in the cold water storage device 12 flows into the circulation pipeline. The heat generated during the power generation process of the photovoltaic device 1 is absorbed by the cold water, and the cold water is converted into hot water. The hot water flows into the hot water storage device 9 through the circulation pipeline to achieve heat storage.

[0066] Step S3: When heating is required at low temperatures, open valve V18. The shallow geothermal energy system introduces the low-temperature surface air into the ground through buried pipes for preheating. Open valves V16 and V17 to activate the heat exchange function of the bidirectional heat exchanger. The preheated internal fresh air exchanges heat with the high-temperature air inside the building, further increasing the temperature. At the same time, the internal air is exhausted from the building, and the heated internal fresh air is sent into the room, reducing the energy consumption of the cooling device. The hot water in the hot water storage device 9 can be used to heat the room through the heat exchanger 11 or directly supply the residence.

[0067] When high temperatures require cooling, valve V18 is opened, and the shallow geothermal system 13 introduces the high-temperature surface air into the ground for cooling. At the same time, valves V16 and V17 are closed, shutting off the heat exchange function of the bidirectional heat exchanger. The cooled internal fresh air is then sent into the room, while the high-temperature indoor air is exhausted from the building, reducing the energy consumption of the heating device. Simultaneously, electric energy can be used to drive a water-cooled heat pump for cooling, achieving a cooling supply. During transitional seasons, the building's internal cooling and heating supply can be achieved solely through the shallow geothermal system 13.

[0068] In this embodiment, the system's electrical energy is provided by the photovoltaic device 1, and the wind turbine device 2 generates electricity by default and directly inverts it to the grid. Cooling and heating are achieved by using the collected waste heat of the system through a water-type heat pump and heat exchanger 11. The system's electricity consumption is affected by the building's energy consumption, and the power generation of the photovoltaic device 1 is also affected by the sunlight conditions. The operation of the photovoltaic device 1 also affects the heat stored in the hot water storage device 9, thus affecting the cooling and heating. Therefore, the above system operation method needs to be adjusted according to the actual situation.

[0069] Specifically, step S1 is adjusted according to the following steps:

[0070] When the photovoltaic device 1 generates P S Residential electricity demand P is greater than or equal to R Time (P) S >P R ), prioritize the portion exceeding residential electricity consumption (P) S -P R The energy is stored in the energy storage system 6 inside the residence.

[0071] Step S12: After the residential energy storage system 6 is fully charged or reaches its maximum storage capacity, the electricity consumed is P. C If the electricity generated by photovoltaic device 1 has not been completely consumed at this time, the remaining electricity (P) will be used to... S -P R -P C The data is stored through the vehicle-to-everything (V2X) interaction system 5.

[0072] Step S13: When the electric vehicle is in a non-idle state, fully charged, and charging is complete, the power consumed by the vehicle-to-grid interaction system 5 is P. V If the electricity generated by photovoltaic device 1 has not been completely consumed at this time, the remaining electricity (P) will be used to... S -P R -P C -P V Stored in a battery.

[0073] Step S14: When the battery is fully charged or reaches its maximum capacity, the amount of electricity consumed is P. B If the battery is not completely depleted, the remaining battery power (P) will be used to... S -P R -P C -P V -P B ) After the converter is inverted, it is connected to the power grid 14.

[0074] Step S15: When the photovoltaic device 1 generates P S When housing demand cannot be met, i.e., P S <P R The residential internal energy storage system will be prioritized for power supply, with a power supply capacity of P. C,d .

[0075] Step S16: When the power supplied by the residential internal energy storage system 6 is still insufficient to meet the electricity demand, i.e., P... C,d <P R -P S The external battery of the residence provides power, and the amount of power supplied is P. B,d .

[0076] Step S17: If the battery supplies power P B,d Unable to meet electricity demand, i.e., P B,d <P R -P S -P C,d The vehicle-to-everything (V2X) communication system 5 acts as a power source, supplying P power. V,d .

[0077] Step S18: If the condition still cannot be met, i.e., P... V,d <P R -P S -PC,d -P B,d The power supply system for the wind turbine unit 2 will then be replenished with a supply amount of P. W If the demand still cannot be met, then power grid 14 will supply power to the residence.

[0078] 2) The building has no need for cooling, heating, or electricity, and has good lighting conditions, enabling stable photovoltaic and solar thermal power generation and heat production;

[0079] Step S1: Receive the dispatch instruction from the power grid 14, and the power generated by the photovoltaic device 1 and the wind turbine device 2 is directly fed into the grid.

[0080] Specifically, in step S1 above, when the power grid 14 experiences excessive load or frequency instability, the battery, energy storage system 6, and vehicle-to-grid interaction system 5 start up and output power simultaneously, playing a role in peak shaving, frequency regulation, and phase regulation.

[0081] 3) The building has cooling, heating and electricity needs, but poor lighting conditions prevent photovoltaic and solar thermal power generation and heating from being stable;

[0082] Step S1: The power generated by the wind turbine unit 2 is preferentially fed into the DC bus 3 to supply the building load 7.

[0083] Step S2: Open valve V1, and the cold water from the cold water storage device 12 flows into the circulation pipeline, absorbs the waste heat of the system's related facilities, and is finally stored in the hot water storage device 9.

[0084] Step S3: When heating is needed at low temperatures, valve V18 is opened. The shallow geothermal system 13 introduces surface air into the ground through buried pipes for preliminary preheating. Valves V16 and V17 are opened, and the heat exchange function of the bidirectional heat exchanger is activated. The preheated internal fresh air exchanges heat with the high-temperature indoor air inside, further increasing the temperature. The internal air is discharged from the building, and the heated internal fresh air is sent into the room, reducing the energy consumption of the cooling device. The hot water in the hot water storage device 9 is supplied to the room for heating through the heat exchanger 11 or directly to the residence to meet the hot water supply.

[0085] When high temperatures require cooling, valve V18 is opened, and the shallow geothermal system 13 introduces surface air into the ground for cooling and removes high-temperature indoor air. At the same time, valves V16 and V17 are closed, shutting off the heat exchange function of the bidirectional heat exchanger. Cooled fresh air is then introduced into the room, while high-temperature indoor air is expelled from the building, thereby reducing the energy consumption of the heating device. Electricity drives the water-type heat pump for cooling, achieving a cooling supply. During transitional seasons, the building's internal cooling and heating can be achieved solely through the shallow geothermal system 13.

[0086] Specifically, step S1 is adjusted according to the following steps:

[0087] Specifically, step S1 in the embodiment is adjusted according to the following steps:

[0088] Step S11, when the power generation P of wind turbine unit 2 W Greater than or equal to the building's electricity demand P R At that time, (P) W >P R ), prioritize the remaining power (P) W -P R The energy is stored in the energy storage system 6 within the building.

[0089] Step S12: After the energy storage system 6 is fully charged or reaches its maximum storage capacity, the amount of electricity consumed is P. C If the electricity generated by fan unit 2 has not been completely consumed at this time, the remaining electricity (P) will be used to... W -P R -P C ) Used in vehicle-to-everything (V2X) interaction systems 5.

[0090] Step S13: When the electric vehicle is in a non-idle state, fully charged, and charging is complete, the charging amount of the electric vehicle is P. V If the electricity generated by the fan unit 2 has not been completely consumed at this time, the remaining electricity (P) will be used to power the fan unit 2. W -P R -P C -P V Stored in a battery.

[0091] Step S14: When the battery is fully charged or reaches its maximum capacity, the amount of electricity consumed is P. B If the battery is not completely depleted, the remaining battery power (P) will be used to... W -P R -P C -P V -P B ) After the converter is inverted, it is connected to the power grid 14.

[0092] Step S15, when the power generation P of wind turbine unit 2 W When housing demand cannot be met, i.e., P w <P R The energy storage system 6 is selected as the preferred source for power supply, with a power supply capacity of P. C,d .

[0093] Step S16: When the power supplied by the energy storage system 6 is still insufficient to meet the electricity demand, i.e., P... C,d <P R -P S The battery releases energy to supply power, and the amount of power supplied is P. B,d .

[0094] Step S17: If the battery supplies power P B,d Unable to meet electricity demand, i.e., P B,d <P R -PS -P C,d The electric vehicle acts as a power source, releasing energy to supply power, with the amount of power supplied being P. V,d .

[0095] 4) The building has no demand for cooling, heating, or electricity, and poor lighting conditions, so photovoltaic and solar thermal power generation and heating cannot be stably provided.

[0096] Step S1: Receive the dispatch instruction from the power grid 14, and the power generated by the wind turbine unit 2 is directly converted and inverted to the grid.

[0097] Specifically, in step S1 above, when the power grid 14 experiences excessive load or frequency instability, the battery, energy storage system 6, and vehicle-to-grid interaction system 5 form a hybrid energy storage system 6, which starts up and outputs power to play a role in peak shaving, frequency regulation, and phase regulation.

[0098] The photovoltaic device 1, vehicle-to-grid interaction system 5, battery, and energy storage system 6 mentioned above all generate waste heat during operation, requiring water as the working fluid for heat exchange. The working fluid achieves cooling and heating through heat exchanger 11 and water-cooled heat pump. Based on the basic principle of cascade utilization, the pipeline structure and the operation method of circulating water in the pipeline are as follows:

[0099] A main circulating water pipeline flows sequentially through photovoltaic device 1 (50-80℃), vehicle-to-grid interaction system 5 (40-60℃), battery (30-50℃), and energy storage system 6 (30-50℃) according to the heat source temperature. Simultaneously, each device is equipped with a bypass pipeline. The corresponding valve is controlled according to the device's start / stop status. If the device is in operation, the water flows through the main pipeline; if it is off, the water flows through the bypass pipeline of the corresponding facility back into the main pipeline, ultimately converging into the hot water storage device 9. When users have cooling or heating needs, valves V14 and V15 are opened, allowing hot water to flow to heat exchanger 11 and the water-cooled heat pump, then back to the cold water storage device 12 to achieve circulation.

[0100] The operation method is as follows:

[0101] Step S1: The dry circulating water pipeline flows sequentially through the photovoltaic device 1 (50-80℃), the vehicle-to-grid interaction system 5 (40-60℃), the energy storage system 6 (30-50℃), and the battery (30-50℃) according to the heat source temperature.

[0102] Step S2: When the photovoltaic device 1 generates electricity, open valves V2 and V3 and close valve V4. At this time, the circulating water flows through the main pipeline to exchange heat with the photovoltaic device 1. When the photovoltaic device 1 is in a shutdown state, open valve V4 and close valves V2 and V3. At this time, the circulating water flows through the bypass pipeline.

[0103] Step S3: When the vehicle-to-grid interaction system 5 charges the electric vehicle or supplies power to the DC bus 3, open valves V5 and V6 and close valve V7. At this time, the circulating water flows through the main pipeline to exchange heat with the vehicle-to-grid interaction system 5. When the vehicle-to-grid interaction system 5 is in a shutdown state, open valve V7 and close valves V5 and V6. At this time, the circulating water flows through the bypass pipeline.

[0104] Step S4: When the energy storage system 6 is in operation, open valves V8 and V9 and close valve V10. At this time, the circulating water flows through the main pipeline to exchange heat with the energy storage system 6. When the energy storage system 6 is in shutdown state, open valve V10 and close valves V8 and V9. At this time, the circulating water flows through the bypass pipeline.

[0105] Step S5: When the battery is in operation, open valves V11 and V12 and close valve V13. At this time, the circulating water flows through the main pipeline to exchange heat with the battery. When the battery is in shutdown state, open valve V13 and close valves V11 and V12. At this time, the circulating water flows through the bypass pipeline and is finally stored in the hot water storage device 9.

[0106] Step S6: When the user has a cooling need, open valve V15, and the circulating water flows through the water-heating heat pump to achieve cooling. Then the circulating water flows back to the cold water storage device 12. When the user has a heating need, open valve V14, and the circulating water flows through the heat exchanger 11 to send heat into the building. Then the circulating water flows back to the cold water storage device 12 to complete the final cycle.

[0107] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A wind-solar-storage-direct-flexible building energy system combined with geothermal energy, characterized in that, The system comprises a power generation subsystem, a refrigeration and heating subsystem, and a water storage subsystem, the power generation subsystem comprises a photovoltaic device installed outside the building and converting light energy into electric energy, a fan device converting wind energy into electric energy, an energy storage system arranged inside the building, a battery, and a vehicle-to-grid system; The photovoltaic device is connected with a direct current bus, the direct current bus is electrically connected with the building load, the energy storage system, the battery, the vehicle-to-grid system, and the power grid, direct current generated by the photovoltaic device is used to supply power to the building load through the direct current bus, when the generated power is more than the power supply demand of the building load, the direct current is stored in the energy storage system or the battery or the vehicle-to-grid system or connected with the power grid through an inverter; The refrigeration and heating subsystem comprises a shallow geothermal system and an air conditioning system, the shallow geothermal system guides the ground surface air inside the building to carry out refrigeration or heating to form internal fresh air, the air conditioning system carries out refrigeration or heating on the internal air inside the building; The water storage subsystem comprises a hot water storage device, a heat exchanger, and a cold water storage device, the hot water storage device and the cold water storage device are connected through a circulating pipeline, cold water in the cold water storage device absorbs heat to form hot water after passing through the circulating pipeline, the hot water is stored in the hot water storage device, the heat exchanger is connected with the hot water storage device, the hot water exchanges heat through the heat exchanger to form cold water, and the cold water is stored in the cold water storage device; The water storage subsystem comprises a collecting device connected with the circulating pipeline, the collecting device collects external rainfall or snowfall, and converts the rainfall or snowfall into circulating water, and the circulating water enters the circulating pipeline; The circulating pipeline passes through the photovoltaic device, the energy storage system, and the battery respectively, and the cold water flowing out of the cold water storage device exchanges heat in the photovoltaic device, the energy storage system, and the battery respectively to form hot water flowing to the hot water storage device; The shallow geothermal system comprises a buried pipe buried underground, and the buried pipe is connected with the heat exchanger; when the building interior is in a high temperature state, the ground surface air inside the building is guided into the shallow geothermal system through the buried pipe to be cooled, the heat exchanger is closed, and the internal fresh air after refrigeration is discharged to the building interior; when the building interior is in a low temperature state, the ground surface air inside the building is guided into the shallow geothermal system through the buried pipe to be exchanged, the heat exchanger is opened, and the internal fresh air after heat exchange is discharged to the building interior; In the case that the building interior has cold, heat, and electricity demand, the light condition is good, the photovoltaic and photothermal stable power generation and heat production, the wind, light, storage, and direct current flexible building energy system combined with geothermal energy is operated according to the following operation method: Step S1, the photovoltaic device generates clean electricity by using solar radiation, and the generated power is preferentially fed into the direct current bus to supply the building load inside the building; Step S2, open the valve V1, the cold water in the cold water storage device is fed into the circulating pipeline, the heat generated in the process of power generation of the photovoltaic device is absorbed by the cold water, the cold water is converted into hot water, and the hot water flows into the hot water storage device through the circulating pipeline; Step S3, when low temperature needs heating, open valve V18, the shallow geothermal system through the buried pipe into the ground low temperature of the ground air preheating, open valve V16, valve V17, bidirectional heat exchanger heat exchange function open, preheated internal fresh air in the building with the building interior high temperature air heat exchange; hot water in the heat storage water device through the heat exchanger to indoor heating or direct supply to the residence; When high temperature needs cooling, open valve V18, the shallow geothermal system will introduce high temperature of the ground air into the ground cooling, at the same time, close valve V16, valve V17, bidirectional heat exchanger heat exchange function is closed, the cooled internal fresh air into the room.

2. The wind-solar-geothermal energy combined and stored direct flexible building energy system of claim 1, wherein, The fan device is connected with the inverter, and the electric energy generated by the fan device is inverted by the inverter to connect the power grid. 3.The wind-solar-geothermal energy combined and stored direct flexible building energy system of claim 1, wherein, The photovoltaic device is arranged on the top of the building, and the fan device is arranged outside the building.

4. The wind-solar-geothermal energy combined and stored direct flexible building energy system in accordance with claim 1, wherein, When the amount of direct current generated is more than the power supply demand of the building load, according to the priority level, the direct current is sequentially stored in the energy storage system, the battery, the vehicle-to-grid system and the power grid connected through the inverter.

5. The wind-solar-geothermal energy-harvesting building integrated flexible energy system of any one of claims 1 to 4, wherein, The vehicle-to-grid system has a charging gun, and the circulating pipeline passes through the charging gun. The cold water in the circulating pipeline is heat exchanged in the charging gun.

6. The wind-solar-geothermal energy-harvesting building integrated flexible energy system of any one of claims 1 to 4, wherein, The hot water in the heat storage water device is heat exchanged by the heat exchanger to generate heat, and the heat heats the internal air in the building.

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