Wind and light storage direct-flexible building energy system combined with geothermal energy

Abstract

The invention relates to the technical field of building energy systems, and discloses a wind and light storage direct flexible building energy system combined with geothermal energy, which comprises a power generation subsystem, a refrigeration and heating subsystem and a water storage subsystem, and is characterized in that the power generation subsystem comprises a photovoltaic device, a fan device, an energy storage system, a storage battery and a vehicle network interaction system; the photovoltaic device is connected with the direct-current bus, direct current generated by the photovoltaic device supplies power to the building load through the direct-current bus, and when the generating capacity of the direct current is larger than the power supply demand of the building load, the direct current is synchronously stored in an energy storage system or a storage battery or a vehicle-network interaction system or connected with a power grid through an inverter; the refrigerating and heating subsystem comprises a shallow geothermal system and an air conditioning system, and the shallow geothermal system introduces surface air in the building for refrigerating or heating to form 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 circulation pipeline.

Description

Technical Field

[0001] This invention patent relates to the technical field of building energy systems. Specifically, it relates to a wind-solar-storage-direct-current-soft building energy system combined with geothermal energy. Background Art

[0002] According to statistics, the energy consumption of the whole process of domestic buildings accounts for 45% of the total national energy consumption, and the carbon emissions account for 50.6% of the total national emissions. Reducing building energy consumption and carbon emissions 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-saving and functional technologies, primary energy such as wind, light, and air energy is generally used to provide energy for buildings, and functional systems are composed of photovoltaic / thermal (PV / T) photovoltaic effect, wind power generation technology, heat pump / air conditioning technology, etc. to supply different types and qualities of energy such as electricity, heat, and cold for buildings.

[0004] In the current building energy system, during the application process, the supply stability and sustainability of clean energy are greatly affected by the intermittency and volatility of wind power and PV / T. The supply of building cooling and heating depends on the air conditioning system, and the energy consumption needs to be optimized. In addition, buildings generally use alternating current power grids, and the reactive power loss in the photovoltaic inversion process and the distribution network is relatively large, and power supply energy-saving needs to be optimized; new energy vehicles rapidly popularized in buildings compete with the power supply network for grid load, posing a challenge to the stability of the power grid.

[0005] In summary, how to solve the supply problem of building energy systems locally and stably at low cost and optimize the distribution of energy for energy-consuming equipment in buildings has become an urgent problem to be solved. To effectively solve the above problems, the industry has actively explored around reducing building energy consumption and improving the utilization rate of new energy.

[0006] For example, in the Chinese invention patent with the publication number CN116111946A, an innovative wind-solar-thermal-storage-direct-current-soft energy-producing building energy system is proposed. This building energy system combines renewable energy such as wind energy and solar energy with energy-producing building materials, and is equipped with energy storage and heat storage devices to build energy-producing buildings and zero-carbon buildings, achieving energy self-sufficiency;

[0007] For example, in the Chinese invention patent with the publication number CN116191552A, a wind power-photovoltaic-optical-thermal-geothermal flexible energy storage energy-producing building energy system is proposed. This building energy system not only greatly 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 low-carbonization of building energy supply;

[0008] The Chinese invention patent with the publication number CN217240395U constructs a photovoltaic-storage-direct-flexible shared building energy system, covering photovoltaic modules, energy storage batteries and shared charging parking spaces. This building energy system improves the on-site consumption capacity of photovoltaic power generation while effectively reducing energy transmission losses, and at the same time increases the charging income of the building through shared charging parking spaces.

[0009] In the prior art, the building energy system has the following defects:

[0010] 1) Strong dependence on weather, with low energy supply guarantee and stability;

[0011] 2) The energy storage method of the building energy system is single, only equipped with a storage battery with a fixed energy for energy storage, lacking energy storage flexibility;

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

[0013] 4) The building energy system aims at low energy consumption, with insufficient utilization of the primary energy around the building, and it is difficult for the building to transition and upgrade from a low-energy-consuming building to a power-generating building. Summary of the Invention

[0014] The purpose of the present invention is to provide a wind-solar-storage-direct-flexible building energy system combined with geothermal energy, aiming to solve the problem of low energy supply guarantee and stability of the building energy system in the prior art.

[0015] The present invention is implemented as follows. The wind-solar-storage-direct-flexible building energy system combined with geothermal energy includes a power generation subsystem, a refrigeration 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, a storage battery, and a vehicle-grid interaction system arranged inside the building;

[0016] The photovoltaic device is connected to the DC bus, and the DC bus is electrically connected to the building load, the energy storage system, the storage battery, the vehicle-grid interaction system, and the power grid respectively. The direct current generated by the photovoltaic device is supplied to the building load through the DC bus. When the generated direct current is more than the power supply demand of the building load, the direct current is synchronously stored in the energy storage system or the storage battery or the vehicle-grid interaction system or connected to the power grid through an inverter;

[0017] The refrigeration and heating subsystem includes a shallow geothermal system and an air conditioning system. The shallow geothermal system introduces the surface air inside the building for refrigeration or heating to form internal fresh air, and the air conditioning system cools or heats the internal air inside the building;

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

[0019] Further, the fan device is connected to an inverter, and the electric energy generated by the fan device is inversely connected to the power grid through the inverter.

[0020] Further, the photovoltaic device is arranged on the top of the building, and the fan device is arranged outside the building.

[0021] Further, when the generated amount of direct current is more than the power supply demand of the building load, according to the priority level, the direct current is preferentially stored in the energy storage system, the storage battery, the vehicle-to-grid interaction system, and is inversely connected to the power grid through the inverter in sequence.

[0022] Further, the water storage subsystem includes a collection device, the collection device is connected to the circulation pipeline, the collection device collects external rainfall or snowfall, converts the rainfall or snowfall into recycled water, and the recycled water enters the circulation pipeline.

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

[0024] Further, the vehicle-to-grid interaction system has a charging gun, the circulation pipeline passes through the charging gun, and the cold water in the circulation pipeline exchanges heat in the charging gun.

[0025] Further, the shallow geothermal system includes a buried pipe buried underground, and the buried pipe is connected to the heat exchanger; 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 through the buried pipe for cooling, and the heat exchanger is closed, and the cooled internal fresh air is discharged into the building; when the interior of the building is in a low-temperature state, the surface air inside the building is introduced into the shallow geothermal system through the buried pipe for heat exchange, the heat exchanger is opened, and the heat-exchanged internal fresh air is discharged into the building.

[0026] Further, the hot water in the heat storage water device exchanges heat through the heat exchanger to generate heat, and the heat heats the internal air inside the building.

[0027] Compared with the prior art, the integrated wind-solar-storage-direct-current-flexible building energy system with geothermal energy provided by the present invention has the following advantages:

[0028] 1) In view of the intermittency and volatility of power generation of photovoltaic devices, a wind turbine device is added to generate electricity, ensuring more stable power supply to the building and reducing the impact of climate environment and geographical location on the power supply stability of the system;

[0029] 2) A shallow geothermal system is added to improve the cooling and heating capacity and reduce the building energy consumption; at high temperatures, the shallow geothermal system introduces surface air into the ground for cooling, sends the cooled fresh internal air into the building interior, and discharges 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 fresh internal air is sent into the building interior, which can reduce the energy consumption of cooling and heating equipment and avoid the use of air conditioning systems in the transition season;

[0030] 3) In view of the fluctuations, intermittency, instability characteristics of photovoltaic devices and wind turbine devices, as well as the phenomenon of abandoned wind and abandoned light during the grid-connected power generation process, a battery, an internal energy storage system and a vehicle-to-grid interaction system are added, which can not only suppress the fluctuations of wind and photovoltaic power generation, but also regulate the working state of the power grid;

[0031] 4) For clean energy power generation, DC power supply is adopted. In view of the problem of the small available amount of DC load equipment in the current building, a DC microgrid is formed inside the system, and the excess power is inverted and fed into the grid, realizing the transformation and upgrading from a low-energy-consuming building to a power-generating building;

[0032] 5) In view of the limited energy utilization rate and weak coupling characteristics of traditional combined heat and power systems, the cold water of the cold storage water device flows into the circulation pipeline and absorbs heat to form hot water stored in the hot storage water device, realizing the efficient utilization of energy, which can be used for cooling and heating. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 is a schematic flow chart of the building energy system integrating geothermal energy with wind, light, storage, DC and flexibility provided by the present invention;

[0034] Figure 2 is an operation scheme diagram when there are cold, heat and electricity demands inside the building provided by the present invention, and they can be separately supplied by photovoltaic devices and energy storage systems;

[0035] Figure 3 is an operation scheme diagram when there are cold, heat and electricity demands inside the building provided by the present invention, but they cannot be separately supplied by photovoltaic devices and energy storage systems alone. DETAILED DESCRIPTION OF THE INVENTION

[0036] In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention, and are not used to limit the present invention.

[0037] The implementation of the present invention will be described in detail below in conjunction with 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 the present invention, it should be understood that if there are terms such as "upper", "lower", "left", "right", etc. indicating the orientation or positional relationship, they are based on the orientation or positional relationship shown in the accompanying drawings. This is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the terms describing the positional relationship in the accompanying drawings are only for illustrative purposes and cannot be understood as a limitation of this patent. For those of ordinary skill in the art, the specific meanings of the above terms can be understood according to specific circumstances.

[0039] Refer to Figures 1-3 As shown, it is a preferred embodiment provided by the present invention.

[0040] The wind-solar-storage-direct-flexible building energy system combined with geothermal energy includes a power generation subsystem, a refrigeration 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 light 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 storage battery, and a vehicle-to-grid interaction system 5;

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

[0042] The refrigeration and heating subsystem includes a shallow geothermal system 13 and an air conditioning system 4. The shallow geothermal system 13 introduces the surface air inside the building for refrigeration or heating to form internal fresh air, and the air conditioning system 4 cools or heats the internal 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 through 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, and the hot water is stored in the hot water storage device 9. The heat exchanger 11 is connected to the hot water storage device 9, and 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 above-provided wind-solar-storage-direct-flexible building energy system combined with geothermal energy has the following advantages:

[0045] 1) In view of the intermittency and volatility of the power generation of the photovoltaic device 1, a wind turbine device 2 is added for power generation to ensure more stable power supply to the building and reduce the impact of climate environment and geographical location on the power supply stability of the system;

[0046] 2) A shallow geothermal system 13 is added to improve the cooling and heating capacity and reduce the 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 interior, and discharges 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 interior, which can reduce the energy consumption of cooling and heating equipment and avoid the use of the air-conditioning system 4 in the transitional season;

[0047] 3) In view of the fluctuation, intermittency, instability characteristics of the photovoltaic device 1 and the wind turbine device 2 and the phenomenon of wind and light abandonment in the grid-connected power generation process, a storage battery, an internal energy storage system 6 and a vehicle-to-grid interaction system 5 are added, which can not only suppress the fluctuations of wind and light power generation, but also regulate the working state of the power grid 14;

[0048] 4) For clean energy power generation, DC power supply is adopted. In view of the problem of the small available amount of DC load equipment in the current building, a DC microgrid is formed inside the system, and the excess power is inverted and fed into the grid, realizing the transformation and upgrading from a low-energy-consuming building to a power-generating building;

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

[0050] In this embodiment, the wind turbine device 2 is connected to an inverter, and the electric energy generated by the wind turbine device 2 is inversely connected to the power grid 14 through the inverter.

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

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

[0053] In this embodiment, when the generated DC power is more than the power supply demand of the building load 7, according to the priority level, the DC power is preferentially stored in the energy storage system 6, the storage battery 8, the vehicle-to-grid interaction system 5 and inversely connected to the power grid 14 through the inverter in sequence.

[0054] When the power generation is greater than the electricity demand of the building, the surplus electricity is preferentially stored in the energy storage system 6 of the building. When the energy storage system 6 reaches its maximum capacity and there is still surplus electricity, the internal battery of the electric vehicle is used as an energy storage device through the vehicle-to-grid interaction system 5. If there is still surplus electricity, it is considered to be stored in the external battery of the building, and finally the excess electricity is inverted and fed into the grid.

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

[0056] When the power generation cannot meet the electricity demand of the building, energy is released and supplied in the order of the energy storage system 6 inside the building, the external battery of the building, and the vehicle-to-grid interaction system 5. At the same time, the circulating water exchanges heat in the order of the photovoltaic device 1, the charging gun of the vehicle-to-grid interaction system 5, the energy storage system 6 inside the building, and the battery, and is stored in the heat storage water device 9; when the power generation of the photovoltaic device 1 and the wind turbine device 2 and all energy storage facilities still cannot meet the electricity demand of the system, the electric energy of the power grid 14 is utilized.

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

[0058] In this embodiment, the vehicle-to-grid interaction system 5 has a charging gun, and the circulating pipeline passes through the charging gun, and the cold water in the circulating pipeline exchanges heat in the charging gun.

[0059] In this embodiment, the shallow geothermal system 13 includes buried ground pipes, and the ground pipes are 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 ground pipes for cooling, and the heat exchanger 11 is closed, and the cooled internal fresh air is discharged into the building;

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

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

[0062] In this embodiment, the operation method of the wind-solar-storage DC-AC building energy system combined with geothermal energy is as follows:

[0063] 1). There are cold, heat, and electricity demands inside the building, the lighting conditions are good, and the photovoltaic and solar thermal generate electricity and heat stably;

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

[0065] Step S2: Open the valve V1. 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 realize heat storage.

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

[0067] When cooling is required at high temperature, open the valve V18. The shallow geothermal system 13 introduces the high-temperature surface air into the ground for cooling. At the same time, close the valves V16 and V17 to turn off the heat exchange function of the two-way heat exchanger. The cooled fresh air inside the building is sent into the room. At the same time, the high-temperature air inside the room is discharged from the building to reduce the energy consumption of the heating device. At the same time, the water-heat type heat pump can be driven by electricity for refrigeration to achieve cold supply. In the transitional season, the cold and heat supply inside the building can be realized only through the shallow geothermal system 13.

[0068] In this embodiment, the electric energy of the system is provided by the photovoltaic device 1. The power generation of the fan device 2 is defaulted to be directly inverted and connected to the grid. Refrigeration and heating are realized by the water-heat type heat pump and the heat exchanger 11 using the collected waste heat of the system. While the power consumption of the system is affected by the building energy consumption situation, the power generation of the photovoltaic device 1 is also affected by the lighting conditions. The working condition of the photovoltaic device 1 also affects the heat stored in the hot water storage device 9, thereby affecting refrigeration and heating. Therefore, the above system operation method needs to be adjusted according to the actual situation.

[0069] Specifically, Step S1 is adjusted as follows:

[0070] When the power generation amount P of the photovoltaic device 1 S is greater than or equal to the electricity consumption demand P of the residence R (P S > P R ), preferentially store the part exceeding the electricity consumption of the residence (P S - P R ) in the energy storage system 6 inside the residence.

[0071] Step S12: After the residential energy storage system 6 is fully charged or reaches the maximum storage capacity, the consumed power is P C , if the power generated by the photovoltaic device 1 has not been completely consumed at this time, the remaining power (P S -P R -P C ) is stored through the vehicle-to-grid interaction system 5.

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

[0073] Step S14: After the storage battery is fully charged or reaches the maximum storage capacity, the consumed power is P B , if the power has not been completely consumed yet, the remaining power (P S -P R -P C -P V -P B ) is combined, inverted, and then incorporated into the power grid 14.

[0074] Step S15: When the power generation P S of the photovoltaic device 1 cannot meet the residential demand, that is, P S < P R , the residential internal energy storage system 6 is preferentially selected to release energy for power supply, and the power supply amount is P C,d .

[0075] Step S16: When the power supply from the residential internal energy storage system 6 still cannot meet the power demand, that is, P C,d < P R -P S , the external residential storage battery releases energy for power supply, and the power supply amount is P B,d .

[0076] Step S17: If the power supply P B,d from the storage battery cannot meet the power demand, that is, P B,d < P R -P S -P C,d , the vehicle-to-grid interaction system 5 is used as a power source to release energy for power supply, and the power supply amount is P V,d .

[0077] Step S18: If it still cannot be satisfied, that is, P V,d < P R -P S -PC,d -P B,d , the generated power of the fan device 2 is supplied to the system, and the supply amount is P W , if it still cannot be satisfied, the power grid 14 supplies power to the residence.

[0078] 2), There is no demand for cold, heat, and electricity inside the building, the lighting conditions are good, and the photovoltaic and solar thermal systems generate electricity and heat stably;

[0079] Step S1: Receive the dispatching instruction of the power grid 14, and the generated electricity of the photovoltaic device 1 and the fan device 2 is directly converged and fed into the grid.

[0080] Specifically, in the above step S1, when the load of the power grid 14 is too large or the frequency is unstable, the battery, the energy storage system 6, and the vehicle-grid interaction system 5 are started to output power simultaneously, playing roles such as peak shaving, frequency modulation, and phase modulation.

[0081] 3), There is a demand for cold, heat, and electricity inside the building, the lighting conditions are poor, and the photovoltaic and solar thermal systems cannot generate electricity and heat stably;

[0082] Step S1: The generated power of the fan device 2 is preferentially fed into the DC bus 3 to supply the building load 7.

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

[0084] Step S3: When heating is required at low temperature, open the valve V18, and the shallow geothermal system 13 introduces the surface air into the ground through the buried pipe for preliminary preheating. Open the valves V16 and V17, and the heat exchange function of the two-way heat exchanger is turned on. The preliminarily heated 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 refrigeration device. The hot water in the hot water storage device 9 supplies heat to the room through the heat exchanger 11 or directly supplies the residence to meet the hot water supply;

[0085] When cooling is required at high temperature, open the valve V18, and the shallow geothermal system 13 introduces the surface air into the ground for cooling and discharges the high-temperature indoor air. At the same time, close the valves V16 and V17, and the heat exchange function of the two-way heat exchanger is turned off. The cooled internal fresh air is sent into the room, and at the same time, the high-temperature indoor air is discharged from the building, thereby reducing the energy consumption of the heating device. The electric energy drives the water-heat type heat pump to refrigerate to achieve cold supply; in the transitional season, the cold and heat supply inside the building can be realized only through the shallow geothermal system 13.

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

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

[0088] Step S11: When the power generation capacity P of the wind turbine device 2 W Greater than or equal to the building electricity demand P R When (P W >P R ), give priority to the remaining power (P W -P R ) 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 the maximum storage capacity, the power consumed is P C If the power generated by the fan device 2 has not been consumed at this time, the remaining power (P W -P R -P C ) is used for vehicle-network interaction system 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 power generated by the fan device 2 has not been consumed at this time, the remaining power (P W -P R -P C -P V ) is stored in the battery.

[0091] Step S14: When the battery is fully charged or reaches the maximum storage capacity, the power consumed is P B If the battery is not fully consumed, the remaining power (P W -P R -P C -P V -P B ) after being merged and inverted and then connected to the grid 14.

[0092] Step S15: When the power generation capacity P of the wind turbine device 2 is W When the housing demand cannot be met, P w <P R , the energy storage system 6 is selected to release energy for power supply, and the power supply is P C,d .

[0093] Step S16: When the energy storage system 6 still cannot supply enough electricity to meet the demand, that is, P C,d <P R -P S , the battery releases energy to supply power, the power supply is P B,d .

[0094] Step S17: If the battery supplies power P B,d Unable to meet electricity demand, that is, P B,d <P R -PS -P C,d The electric vehicle supplies power as a power source, and the power supplied is P V,d .

[0095] 4) There is no demand for cold, heat, or electricity inside the building, the lighting conditions are poor, and the photovoltaic and solar thermal systems cannot generate electricity and heat stably;

[0096] Step S1: Receive the dispatching instruction of the power grid 14, and the electricity generated by the fan device 2 is directly converged, inverted, and fed into the grid.

[0097] Specifically, in the above step S1, when the load of the power grid 14 is too large or the frequency is unstable, the battery, the energy storage system 6, and the vehicle-grid interaction system 5 form a hybrid energy storage system 6, which starts and outputs electricity simultaneously to play the roles of peak shaving, frequency modulation, and phase modulation.

[0098] The above-mentioned photovoltaic device 1, vehicle-grid interaction system 5, battery, and energy storage system 6 will all generate waste heat during the working process, and water is used as the working medium for heat exchange. The working medium realizes refrigeration and heating through the heat exchanger 11 and the water heat pump. According to the basic principle of cascade utilization, the structure of the pipeline and the operation method of the circulating water in the pipeline are as follows:

[0099] A main circulating water pipeline flows through the photovoltaic device 1 (50 - 80 °C), vehicle-grid interaction system 5 (40 - 60 °C), battery (30 - 50 °C), and energy storage system 6 (30 - 50 °C) in sequence according to the heat source temperature. At the same time, bypass pipelines are installed at each device, and the corresponding valves are controlled according to the start and stop of the device. If it is in the working state, it passes through the main pipeline. If it is in the shutdown state, it flows into the main pipeline through the bypass pipeline of the corresponding facility and finally converges into the heat storage water device 9. When the user has refrigeration and heating requirements, open the valves V14 and V15, and the hot water flows to the heat exchanger 11 and the water heat pump, and then returns to the cold storage water device 12 to realize the cycle.

[0100] The operation method is as follows:

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

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

[0103] Step S3: When the vehicle-grid interaction system 5 charges the electric vehicle or transmits 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-grid interaction system 5; when the vehicle-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 a working state, 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 a 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 a working state, 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 a shutdown state, open valve V13 and close valves V11 and V12. At this time, the circulating water flows through the bypass pipeline, and the circulating water is finally stored in the heat storage water device 9.

[0106] Step S6: When the user has a refrigeration demand, open valve V15. The circulating water flows through the water-heat type heat pump to achieve refrigeration, and then the circulating water flows back to the cold storage water device 12; when the user has a heating demand, open valve V14. The circulating water flows through the heat exchanger 11 to send heat into the building interior, and then the circulating water flows back to the cold storage water device 12 to complete the final cycle.

[0107] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A wind-solar-storage-direct-current-flexible building energy system integrated with geothermal energy, characterized in that, It includes a power generation subsystem, a refrigeration 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 storage battery, and a vehicle-to-grid interaction system; The photovoltaic device is connected to a DC bus, and the DC bus is electrically connected to a building load, an energy storage system, a storage battery, a vehicle-to-grid interaction system, and a power grid respectively. The direct current generated by the photovoltaic device powers the building load through the DC bus. When the generated direct current is more than the power supply demand of the building load, the direct current is synchronously stored in the energy storage system, or the storage battery, or the vehicle-to-grid interaction system, or connected to the power grid through an inverter; The refrigeration and heating subsystem includes a shallow geothermal system and an air conditioning system. The shallow geothermal system introduces the surface air inside the building for refrigeration or heating to form fresh internal air, and the air conditioning system refrigerates or heats the internal air inside the building; 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. After the cold water in the cold water storage device passes through the circulation pipeline, it absorbs heat to form hot water, and the hot water is stored in the hot water storage device. The heat exchanger is connected to the hot water storage device, and the hot water exchanges heat through the heat exchanger to form cold water, which is stored in the cold water storage device.

2. The integrated wind-solar-storage DC-AC flexible building energy system combined with geothermal energy according to claim 1, characterized in that The wind turbine device is connected to an inverter, and the electrical energy generated by the wind turbine device is connected to the power grid through the inverter after inversion.

3. The integrated wind-solar-storage DC-AC flexible building energy system combined with geothermal energy according to claim 1, characterized in that The photovoltaic device is arranged on the top of the building, and the wind turbine device is arranged outside the building.

4. The integrated wind-solar-storage DC-AC flexible building energy system combined with geothermal energy according to claim 1, characterized in that When the generated direct current is more than the power supply demand of the building load, according to the priority level, the direct current is preferentially stored in the energy storage system, the storage battery, the vehicle-to-grid interaction system, and connected to the power grid through the inverter in sequence.

5. The integrated wind-solar-storage DC-AC flexible building energy system combined with geothermal energy according to any one of claims 1 to 4, characterized in that The water storage subsystem includes a collection device, which is connected to the circulation pipeline. The collection device collects external rainfall or snowfall, converts the rainfall or snowfall into circulating water, and the circulating water enters the circulation pipeline.

6. The integrated wind-solar-storage DC-AC flexible building energy system combined with geothermal energy according to claim 5, characterized in that The circulation pipeline passes through the photovoltaic device, the energy storage system, and the storage 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 storage battery respectively to form hot water flowing towards the hot water storage device.

7. The integrated wind-solar-storage DC-AC flexible building energy system combined with geothermal energy according to claim 6, wherein, The vehicle-to-grid interaction system has a charging gun, and the circulation pipeline passes through the charging gun, and the cold water in the circulation pipeline exchanges heat in the charging gun.

8. The integrated wind-solar-storage DC-AC flexible building energy system combined with geothermal energy according to any one of claims 1 to 4, characterized in that The shallow geothermal system includes buried ground pipes, and the ground pipes are connected to a heat exchanger; when the inside of the building is in a high-temperature state, the surface air inside the building is introduced into the shallow geothermal system through the ground pipes for cooling, and the heat exchanger is closed, and the refrigerated fresh internal air is discharged into the building; when the inside of the building is in a low-temperature state, the surface air inside the building is introduced into the shallow geothermal system through the ground pipes for heat exchange, the heat exchanger is opened, and the heat-exchanged fresh internal air is discharged into the building.

9. The integrated wind-solar-storage DC-AC flexible building energy system combined with geothermal energy according to any one of claims 1 to 4, characterized in that, The hot water in the hot water storage device exchanges heat through the heat exchanger to generate heat, and the heat heats the internal air inside the building.

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