Combined heat and power generation system suitable for coupling traditional radiator PVT heat pump soil cross-season energy storage with municipal heat source

Abstract

The utility model belongs to the technical field of heat supply engineering, solar photovoltaic photo-thermal and shallow geothermal energy comprehensive utilization, and discloses a PVT heat pump soil cross-season energy storage coupling municipal heat source combined heat and power generation system suitable for a traditional radiator. Comprising a municipal thermodynamic system, a solar PVT heat pump soil cross-season energy storage system, a tail end radiator system and an intelligent monitoring control system. The municipal thermodynamic system comprises a municipal thermodynamic primary net, a municipal thermodynamic secondary net, a circulating water pump, a plate heat exchanger, a temperature sensor and an electric valve; the solar PVT heat pump soil cross-season energy storage system comprises a solar PVT array, a solar heat exchange unit, a buried pipe system, an electricity meter, an inverter, a heating heat pump unit and an electric valve set. The intelligent monitoring control system comprises a temperature sensor, an electric valve, a heating heat pump unit and a circulating water pump. Solar energy, air energy and shallow geothermal energy are fully utilized, energy is saved, carbon is reduced, and meanwhile the tail end heating effect is guaranteed.

Description

Technical Field

[0001] The utility model belongs to the technical field of comprehensive utilization of heating engineering, solar photovoltaic and solar thermal energy, and shallow geothermal energy, and relates to a cogeneration system of a PVT heat pump soil seasonal energy storage coupled with a municipal heat source suitable for a traditional radiator. Background Technique

[0002] With the extensive promotion and application of clean energy and the serious impact of excessive carbon emissions on the ecological environment, the coupling function of various clean energies such as solar energy and shallow geothermal energy has become the key development direction of researchers. Existing municipal heat sources have problems such as large pipeline network heat losses, poor regulation flexibility, and uneven heat source distribution, resulting in the inability of the terminal heating system to meet the actual heating needs under certain circumstances. To ensure the user experience, save resources and improve efficiency, compared with other energies, solar energy is inexhaustible, and solar energy can be used for photoelectric conversion, photothermal conversion, and photochemical conversion. There are also a series of research and development applications for energy storage devices for solar energy; most traditional municipal heat sources come from coal-fired, gas-fired or electric boilers, which not only have high operating costs but also cause relatively large pollution to the environment. There is sufficient geothermal energy in the soil of our country that has not been developed and utilized. We can store solar energy in the soil while ensuring that the soil temperature remains unchanged throughout the year, which not only increases the soil temperature on the ground source side during winter heating, thereby improving the operating efficiency of the ground source heat pump unit, but also makes full use of renewable energy and saves the operating cost of the municipal heat source. However, in this field, single solar photovoltaic and solar thermal technologies have technical defects, resulting in low solar energy utilization efficiency. Many researchers have proposed various energy solutions for coupling heat sources with municipal heat sources for heating, such as Yu Qiang et al. proposed a system for combined application of solar energy and multiple heat sources, Li Zhibing et al. proposed a control method for a dual heat source heating device, Huang Bo et al. proposed a heating system and method for combining a municipal heating pipeline network with solar seasonal heat storage, Chen Zongyuan et al. proposed an automatic switching for dual heat source heating and supply, and Wang Jiawei et al. proposed a dual heat source heating system, etc.

[0003] The above research uses a solar collector to store seasonal heat through a heat storage pool or uses a system and control method for coupling an air source heat pump, a gas wall-mounted boiler, etc. with a traditional municipal heat source for winter heating. However, the solar collector can only generate heat and cannot fully utilize the photoelectric conversion function of solar energy. Moreover, due to the influence of the heat storage medium, the heat storage pool needs to occupy a certain space. This system is limited by site restrictions. There is still a large room for improvement in the operating efficiency of gas wall-mounted boilers and air source heat pumps compared with ground source heat pumps in winter. Content of the Utility Model

[0004] In view of the above problems, clean renewable energy solar energy, shallow geothermal energy and municipal heat sources are used as the heat sources of the system to jointly heat the terminal. The utility model proposes a PVT heat pump soil cross-season energy storage coupled with municipal heat source cogeneration system suitable for traditional radiators. It has multiple operating modes according to different temperature conditions in different seasons and can be flexibly switched; the solar PVT array can generate green electricity throughout the year, and green electricity is preferentially used for heat storage and energy supply systems to reduce the impact of peak electricity consumption on the municipal power grid, and the excess electricity can be used for other electrical equipment in the building or incorporated into the national power grid; at the same time, the solar radiation heat energy and air heat energy absorbed by the solar PVT array are used, and the soil is used as a heat storage body, and a professional coolant is used as a flowing medium to store the heat energy absorbed by the PVT in the soil. When the temperature of the water supply pipe of the municipal thermal secondary network is lower than 60°C and cannot meet the winter heating needs of the terminal, the heat stored in the soil is directly used as a low-grade heat source for the ground source heat pump unit to produce 60°C hot water for heating. The utility model realizes full utilization of solar energy, air energy and shallow geothermal energy, saves energy and reduces carbon emissions while ensuring the terminal heating effect.

[0005] The technical solution of this utility model:

[0006] A heat and power cogeneration system of a PVT heat pump soil inter-seasonal energy storage coupled with a municipal heat source suitable for a traditional radiator, comprising a municipal thermal system, a solar PVT heat pump soil inter-seasonal energy storage system, a terminal radiator system and an intelligent monitoring and control system;

[0007] The municipal thermal system includes the municipal thermal primary network, secondary network, circulating water pump, plate heat exchanger, temperature sensor and electric valve; the solar PVT heat pump soil inter-seasonal energy storage system includes solar PVT array, solar heat exchange unit, buried pipe system, inverter, heating heat pump unit, electric valve and temperature sensor, etc.; the intelligent monitoring and control system includes temperature sensor, electric valve and monitoring and control logic of the start-stop interlocking of heating heat pump unit, circulating water pump and other equipment;

[0008] The municipal primary heating network 1 is connected to the primary network side of the plate heat exchanger 2 through valves and pipes; the water outlet on the secondary network side of the plate heat exchanger 2 is connected to the water supply port of the terminal radiator system 7 through the first temperature sensor 3 and the first electric valve 4 in turn by a pipe; the return water port of the terminal radiator system 7 is connected to the return water port of the secondary network side of the plate heat exchanger 2 through a pipe through the first water pump 6 and the second electric valve 5; the water outlet on the condenser side of the heating heat pump unit 10 is connected to the first electric valve 4 and the supply port of the terminal radiator system 7 through the third electric valve 8. The water inlets are connected by a three-way pipe; the return water inlet on the condenser side of the heating heat pump unit 10 is connected between the first water pump 6 and the second electric valve 5 through the fourth electric valve 9, and is connected by a three-way pipe; the inlet on the evaporator side of the heating heat pump unit 10 is connected to the soil heat storage well 17 through the fifth electric valve 11, the second temperature sensor 21, and the second water pump 15 by a pipeline; the outlet on the evaporator side of the heating heat pump unit 10 is connected to the soil heat storage well 17 by a pipeline through the sixth electric valve 12; The PVT side inlet and outlet are connected to the solar PVT array 18; the ground source side inlet of the solar heat exchange unit 16 is divided into two branches, the first branch is connected between the outlet side of the evaporator of the heating heat pump unit 10 and the sixth electric valve 12 through the seventh electric valve 13, and is connected by a three-way pipe; the second branch is connected between the second water pump 15 and the return water port of the evaporator side of the heating heat pump unit 10 through the ninth electric valve 23, and is connected by a three-way pipe; the ground source side outlet of the solar heat exchange unit 16 is divided into two branches, the first branch is connected between the fifth electric valve 11 and the second water pump 15 through the third temperature sensor 22 and the eighth electric valve 14, and is connected by a three-way pipe; the second branch is connected between the outlet side of the evaporator of the heating heat pump unit 10 and the sixth electric valve 12 through the third temperature sensor 22 and the tenth electric valve 24, and is connected by a three-way pipe; the solar PVT array 18 power generation condition uses the solar photovoltaic effect to directly convert solar energy into DC power, which is converted into AC power through the inverter 19, and an electric meter 20 is provided between the inverter 19 and the power grid;

[0009] The power generation condition of the solar PVT array 18 is to supply the AC power generated by the cogeneration system to the plate heat exchanger 2, the first temperature sensor 3, the second temperature sensor 21, the third temperature sensor 22, the first electric valve 4, the second electric valve 5, the third electric valve 8, the fourth electric valve 9, the fifth electric valve 11, the sixth electric valve 12, the seventh electric valve 13, the eighth electric valve 14, the ninth electric valve 23, the tenth electric valve 24, the heating heat pump unit 10, the first water pump 6, the second water pump 15, and the solar heat exchanger unit 16 in priority, and the excess electricity is used for other electrical equipment in the building or connected to the power grid.

[0010] The first electric valve 4, the second electric valve 5, the third electric valve 8, the fourth electric valve 9, the heating heat pump unit 10, the second water pump 15 and the first temperature sensor 3 are interlocked with each other; the fifth electric valve 11, the sixth electric valve 12, the seventh electric valve 13, the eighth electric valve 14 are interlocked with each other with the second temperature sensor 21 and the third temperature sensor 22.

[0011] The heating heat pump unit 10 is a ground source heat pump unit or a water source heat pump unit that can provide heating. The refrigerant in the heating heat pump unit 10 adopts an environmentally friendly refrigerant, the valve is an electromagnetic on-off valve group, and the water pump is a vertical pipeline pump, a horizontal pipeline pump or a multi-stage pump.

[0012] An operation control strategy for a combined heat and power system of a solar PVT heat pump soil seasonal energy storage coupled with a municipal heat source suitable for a traditional radiator is as follows:

[0013] Mode 1: Solar PVT power generation and soil heat storage mode; the fifth electric valve 11, the sixth electric valve 12, the ninth electric valve 23, the tenth electric valve 24, the second water pump 15, and the solar heat exchanger unit 16 are turned on; in spring, summer and autumn, the solar PVT array 18 converts solar energy into AC power through the inverter 19 for use by electrical equipment or is incorporated into the national power grid; the solar PVT array 18 uses the solar heat exchanger unit 16 and the second water pump 15 to store the absorbed solar radiation heat energy and air heat energy in the soil heat storage well 17 for winter heating.

[0014] Mode 2: Solar PVT power generation and soil source heat pump heating mode; the third electric valve 8, the fourth electric valve 9, the fifth electric valve 11, the sixth electric valve 12, the first water pump 6, the second water pump 15, the terminal radiator system 7, and the heating heat pump unit 10 are turned on; in winter, the solar PVT array 18 converts solar energy into AC power through the inverter 19 for use by electrical equipment or is connected to the national power grid; the heating heat pump unit 10 uses the second water pump 15 to extract heat from the soil heat storage well 17 as a low-grade heat source to a high-grade heat source, and produces 60°C hot water for use by the terminal radiator system 7.

[0015] Mode three: solar PVT power generation and PVT heat pump heating mode; the third electric valve 8, the fourth electric valve 9, the seventh electric valve 13, the eighth electric valve 14, the first water pump 6, the second water pump 15, the terminal radiator system 7, the heating heat pump unit 10, and the solar heat exchange unit 16 are turned on; in winter, the solar PVT array 18 converts solar energy into AC power through the inverter 19 for use by electrical equipment or is incorporated into the national power grid; the solar radiation heat energy and air heat energy absorbed by the solar PVT array 18 are exchanged through the solar heat exchange unit 16, and then transported to the heating heat pump unit 10 as a low-grade heat source by the second water pump 15. The heat pump unit uses the reverse Carnot principle to upgrade it to a high-grade heat source, and produces 60°C hot water for use by the terminal radiator system 7.

[0016] Mode 4: Solar PVT power generation and municipal heat source heating mode; the municipal primary heating network 1, plate heat exchanger 2, first electric valve 4, second electric valve 5, first water pump 6, and terminal radiator system 7 are turned on; in winter, the solar PVT array 18 converts solar energy into AC power through the inverter 19 for use by electrical equipment or is incorporated into the national power grid; the municipal primary heating network 1 uses the plate heat exchanger 2 to convert it into 60°C hot water, and uses the first water pump 6 to supply the terminal radiator system 7.

[0017] The switching between the various operating modes is based on the comprehensive consideration of the temperature changes of the solar PVT array, the soil temperature changes and the temperature of the municipal thermal secondary network. The intelligent detection and control system is used to ensure the long-term stable, reliable and efficient operation of the system.

[0018] The beneficial effects of the utility model are as follows: the utility model makes full use of renewable energy sources such as solar energy, air energy and shallow geothermal energy, stores solar radiation heat energy and air heat energy in the soil, and avoids the adverse effect of lowering soil temperature caused by taking heat from the soil in winter; at the same time, through real-time monitoring of the start and stop of temperature control equipment and valves, it reduces operating costs and realizes an unmanned intelligent operation mode; in addition, the solar PVT array can generate green electricity throughout the year, reducing the impact on the municipal power grid during peak electricity consumption, and also plays an important role in energy conservation and emission reduction. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is the system principle diagram of the utility model;

[0020] Figure 2 This is the principle diagram of the solar PVT power generation and soil heat storage mode system of the utility model;

[0021] Figure 3 This is the principle diagram of the solar PVT power generation and soil source heat pump heating mode system of the utility model;

[0022] Figure 4This is the schematic diagram of the solar PVT power generation and PVT heat pump heating mode system of the present utility model;

[0023] Figure 5 This is the schematic diagram of the solar PVT power generation and municipal heat source heating mode system of the present utility model;

[0024] In the figure: 1 municipal primary heat network, 2 plate heat exchanger, 3 first temperature sensor, 4 first electric valve, 5 second electric valve, 6 first water pump, 7 terminal radiator system, 8 third electric valve, 9 fourth electric valve, 10 heating heat pump unit, 11 fifth electric valve, 12 sixth electric valve, 13 seventh electric valve, 14 eighth electric valve, 15 second water pump, 16 solar heat exchange unit, 17 soil heat storage well, 18 solar PVT array, 19 inverter, 20 electric meter, 21 second temperature sensor, 22 third temperature sensor, 23 ninth electric valve, 24 tenth electric valve, 25 fourth temperature sensor. Specific embodiments

[0025] The following further describes the specific embodiments of the present utility model in conjunction with the attached drawings and technical solutions.

[0026] As Figure 2 shown, this is the schematic diagram of the solar PVT power generation and soil heat storage mode system of the present utility model. The system consists of a fifth electric valve 11, a sixth electric valve 12, a second water pump 15, a solar heat exchange unit 16, a soil heat storage well 17, a solar PVT array 18, an inverter 19, an electric meter 20, a second temperature sensor 21, a third temperature sensor 22, a ninth electric valve 23, a tenth electric valve 24, and a fourth temperature sensor 25; the inlet and outlet of the ground source side of the solar heat exchange unit 16 are connected by pipelines through the second temperature sensor 21, the tenth electric valve 24, the sixth electric valve 12, the soil heat storage well 17, the fifth electric valve 11, the third temperature sensor 22, the second water pump 15, and the ninth electric valve 23; the PVT side of the solar heat exchange unit 16 is connected to the solar PVT array 18 by a pipeline through the fourth temperature sensor 25; in the power generation condition of the solar PVT array 18, solar light energy is directly converted into direct current electric energy by the photovoltaic effect of sunlight, and then converted into alternating current electric energy by the inverter 19.

[0027] As Figure 2As shown, the solar PVT array 18 power generation mode is to give priority to supplying the AC power produced by the system to the second water pump 15, the solar heat exchange unit 16, the fifth electric valve 11, the sixth electric valve 12, the ninth electric valve 23, and the tenth electric valve 24, and the excess power is used for other electrical equipment in the building or incorporated into the national power grid; the solar PVT soil heat storage mode is operated in spring, summer and autumn. When the temperature of the fourth temperature sensor 25 is higher than that of the second temperature sensor 21 and reaches the required temperature difference, the fifth electric valve 11, the sixth electric valve 12, the second water pump 15, the solar heat exchange unit 16, the ninth electric valve 23, and the tenth electric valve 24 are opened, and the solar radiation heat energy or air heat energy absorbed by the solar PVT array 18 is stored in the soil by using the solar heat exchange unit 16 to increase the soil temperature for winter heating.

[0028] like Figure 3 As shown, it is the principle diagram of the solar PVT power generation and soil source heat pump heating mode system of the utility model. The system consists of a first water pump 6, a terminal radiator system 7, a third electric valve 8, a fourth electric valve 9, a heating heat pump unit 10, a fifth electric valve 11, a sixth electric valve 12, a second water pump 15, a soil heat storage well 17, a second temperature sensor 21, a solar PVT array 18, an inverter 19, an electric meter 20 and a plurality of valves; the inlet and outlet of the evaporator side of the heating heat pump unit 10 are connected by a pipeline through the sixth electric valve 12, the soil heat storage well 17, the fifth electric valve 11, the second temperature sensor 21, and the second water pump 15; the inlet and outlet of the condenser side of the heating heat pump unit 10 are connected by a pipeline through the third electric valve 8, the terminal radiator system 7, the first water pump 6, and the fourth electric valve 9; the solar PVT array 18 power generation mode uses the solar photovoltaic effect to directly convert solar energy into DC power, and then converts it into AC power through the inverter 19.

[0029] like Figure 3 As shown, the power generation mode of the solar PVT array 18 is to give priority to supplying the AC power produced by the system to the first water pump 6, the heating heat pump unit 10, the third electric valve 8, the fourth electric valve 9, the fifth electric valve 11, the sixth electric valve 12, and the second water pump 15, and the excess electricity is used for other electrical equipment in the building or incorporated into the national power grid; the soil source heat pump heating mode, which operates in winter, when the temperature of the first temperature sensor 3 is lower than 60°C, the first electric valve 4 and the second electric valve 5 are closed, and the third electric valve 8, the fourth electric valve 9, the heating heat pump unit 10, the fifth electric valve 11, the sixth electric valve 12, and the second water pump 15 are opened, and the heating heat pump unit 10 upgrades the low-grade heat source extracted from the soil to a high-grade heat source for heating, thereby ensuring the heating needs of the user end.

[0030] likeFigure 4 As shown, it is the principle diagram of the solar PVT power generation and PVT heat pump heating mode system of the utility model. The system consists of a first water pump 6, a heating heat pump unit 10, a third electric valve 8, a fourth electric valve 9, a seventh electric valve 13, an eighth electric valve 14, a second water pump 15, a solar heat exchange unit 16, a solar PVT array 18, an inverter 19, an electric meter 20, a third temperature sensor 22, a fourth temperature sensor 25 and a number of valves; the inlet and outlet of the PVT side of the solar heat exchange unit 16 are connected to the solar PVT array 18 by a pipeline through the fourth temperature sensor 25, and the inlet and outlet of the ground source side of the solar heat exchange unit 16 are connected to the inlet and outlet of the evaporator side of the heating heat pump unit 19 by a pipeline through the third temperature sensor 22, the eighth electric valve 14, the second water pump 15, and the seventh electric valve 13; the inlet and outlet of the condenser side of the heating heat pump unit 10 are connected by a pipeline through the third electric valve 8, the terminal radiator system 7, the first water pump 6, and the fourth electric valve 9; the solar PVT array 18 uses the solar photovoltaic effect to directly convert solar energy into DC power, and then converts it into AC power through the inverter 19.

[0031] like Figure 4 As shown, the solar PVT array 18 power generation mode is to give priority to supplying the AC power produced by the system to the first water pump 6, the heating heat pump unit 10, the third electric valve 8, the fourth electric valve 9, the seventh electric valve 13, the eighth electric valve 14, the second water pump 15, and the solar heat exchange unit 16, and the excess power is used for other electrical equipment in the building or incorporated into the national power grid; the solar PVT heat pump heating mode, which operates in winter, when the temperature of the first temperature sensor 3 is lower than 60°C, the first electric valve 4 and the second electric valve 5 are closed. Closed, the third electric valve 8, the fourth electric valve 9, the heating heat pump unit 10, the second water pump 15, and the solar heat exchange unit 16 are opened; when the temperature of the third temperature sensor 22 is higher than that of the second temperature sensor 21 and the temperature difference reaches a certain difference, the fifth electric valve 11 and the sixth electric valve 12 are closed, and the seventh electric valve 13 and the eighth electric valve 14 are opened, and the heating heat pump unit 10 uses the solar radiation heat energy or air heat energy absorbed by the solar PVT array 18 as a low-grade heat source to upgrade it to a high-grade heat source for heating, thereby ensuring the heating needs of the user end.

[0032] like Figure 5As shown, the schematic diagram of the solar PVT power generation and municipal heat source heating mode system of the utility model. The system consists of a municipal primary heating network 1, a plate heat exchanger 2, a first temperature sensor 3, a first electric valve 4, a second electric valve 5, a first water pump 6, a terminal radiator system 7, a solar PVT array 18, an inverter 19, and an electric meter 20; the municipal primary heating network 1 is connected to the primary network side of the plate heat exchanger 2 through valves and pipes; the secondary network side water outlet of the plate heat exchanger 2 is connected to the water supply port of the terminal radiator system 7 through a pipe through the first temperature sensor 3 and the first electric valve 4; the return water port of the terminal radiator system 7 is connected to the return water port of the secondary network side of the plate heat exchanger 2 through a pipe through the first water pump 6 and the second electric valve 5; the solar PVT array 18 power generation mode uses the solar photovoltaic effect to directly convert solar energy into DC power, and then converts it into AC power through the inverter 19.

[0033] like Figure 5 As shown, the power generation mode of the solar PVT array 18 is to give priority to supplying the AC power produced by the system to the plate heat exchanger 2, the first electric valve 4, the second electric valve 5, and the first water pump 6, and the excess power is used for other electrical equipment in the building or incorporated into the national power grid; the municipal heat source heating mode is operated in winter. When the temperature of the first temperature sensor 3 is higher than 60°C, the first electric valve 4, the second electric valve 5, and the first water pump 6 are opened, and the municipal primary heating network 1 converts high-temperature water into low-temperature water for terminal heating through the plate heat exchanger 2.

[0034] The switching between the various operating modes is based on the comprehensive consideration of the temperature changes of the solar PVT array, the soil temperature changes and the temperature of the municipal thermal secondary network. The intelligent detection and control system is used to ensure the long-term stable, reliable and efficient operation of the system.

[0035] The present invention is not limited to the present embodiment, and any equivalent concepts or changes within the technical scope disclosed in the present invention are included in the protection scope of the present invention.

Claims

1. A cogeneration system integrating a PVT heat pump with seasonal soil energy storage and municipal heat source for traditional radiators, characterized in that: The primary municipal heat network (1) is connected to the primary side of the plate heat exchanger (2) through valves and pipelines; the outlet of the secondary side of the plate heat exchanger (2) is sequentially connected to the water supply port of the terminal radiator system (7) through the first temperature sensor (3) and the first electric valve (4) by pipelines; the return port of the terminal radiator system (7) is connected to the return port of the secondary side of the plate heat exchanger (2) through the first water pump (6) and the second electric valve (5) by pipelines; the outlet of the condenser side of the heating heat pump unit (10) is connected between the first electric valve (4) and the water supply port of the terminal radiator system (7) through the third electric valve (8) by using a tee connection; the return port of the condenser side of the heating heat pump unit (10) is connected between the first water pump (6) and the second electric valve (5) through the fourth electric valve (9) by using a tee connection; the inlet of the evaporator side of the heating heat pump unit (10) is connected to the soil heat storage well (17) through the fifth electric valve (11), the second temperature sensor (21), and the second water pump (15) by pipelines; the outlet of the evaporator side of the heating heat pump unit (10) is connected to the soil heat storage well (17) through the sixth electric valve (12) by pipelines; the inlet and outlet of the PVT side of the solar heat exchanger unit (16) are connected to the solar PVT array (18); the inlet of the ground source side of the solar heat exchanger unit (16) is divided into two branches. Branch one is connected between the outlet side of the evaporator of the heating heat pump unit (10) and the sixth electric valve (12) through the seventh electric valve (13) by using a tee connection; branch two is connected between the second water pump (15) and the return port of the evaporator side of the heating heat pump unit (10) through the ninth electric valve (23) by using a tee connection; the outlet of the ground source side of the solar heat exchanger unit (16) is divided into two branches. Branch one is connected between the fifth electric valve (11) and the second water pump (15) through the third temperature sensor (22) and the eighth electric valve (14) by using a tee connection; branch two is connected between the outlet side of the evaporator of the heating heat pump unit (10) and the sixth electric valve (12) through the third temperature sensor (22) and the tenth electric valve (24) by using a tee connection; during the power generation operation of the solar PVT array (18), solar energy is directly converted into DC electric energy by the photovoltaic effect of sunlight, and then converted into AC electric energy by the inverter (19). An electricity meter (20) is provided between the inverter (19) and the power grid.

2. The cogeneration system according to claim 1, characterized in that, The power generation condition of the solar PVT array (18) is to preferentially supply the AC electric energy generated by the cogeneration system to the plate heat exchanger (2), the first temperature sensor (3), the second temperature sensor (21), the third temperature sensor (22), the first electric valve (4), the second electric valve (5), the third electric valve (8), the fourth electric valve (9), the fifth electric valve (11), the sixth electric valve (12), the seventh electric valve (13), the eighth electric valve (14), the ninth electric valve (23), the tenth electric valve (24), the heating heat pump unit (10), the first water pump (6), the second water pump (15), and the solar heat exchange unit (16). The excess electric energy is used for building electrical equipment or fed into the power grid.

3. The cogeneration system according to claim 1, characterized in that, The first electric valve (4), the second electric valve (5), the third electric valve (8), the fourth electric valve (9), the heating heat pump unit (10), and the second water pump (15) are interlocked with the first temperature sensor (3); the fifth electric valve (11), the sixth electric valve (12), the seventh electric valve (13), and the eighth electric valve (14) are interlocked with the second temperature sensor (21) and the third temperature sensor (22).

4. The cogeneration system according to claim 1, wherein The heating heat pump unit (10) is a ground-source heat pump unit or a water-source heat pump unit capable of heating. The refrigerant in the heating heat pump unit (10) uses an environment-friendly refrigerant. The valves are electromagnetic on-off valve groups, and the water pumps are vertical pipeline pumps, horizontal pipeline pumps, or multi-stage pumps.

5. The cogeneration system according to claim 1, characterized in that, The solar PVT power generation and soil heat storage mode of the cogeneration system: The fifth electric valve (11), the sixth electric valve (12), the ninth electric valve (23), the tenth electric valve (24), the second water pump (15), and the solar heat exchange unit (16) are opened; in spring, summer, and autumn, the solar PVT array (18) converts solar light energy into AC electric energy through the inverter (19) for use by electrical equipment or fed into the power grid; the solar PVT array (18) stores the absorbed solar radiation heat energy and air heat energy into the soil heat storage well (17) through the solar heat exchange unit (16) and the second water pump (15) for winter heating use.

6. The cogeneration system according to claim 1, wherein The solar PVT power generation and ground-source heat pump heating mode of the cogeneration system: The third electric valve (8), the fourth electric valve (9), the fifth electric valve (11), the sixth electric valve (12), the first water pump (6), the second water pump (15), the terminal radiator system (7), and the heating heat pump unit (10) are opened; in winter, the solar PVT array (18) converts solar light energy into AC electric energy through the inverter (19) for use by electrical equipment or fed into the power grid; the heating heat pump unit (10) uses the second water pump (15) to extract heat from the soil heat storage well (17) as a low-grade heat source and upgrade it to a high-grade heat source to produce 60°C hot water for the terminal radiator system (7) to use.

7. The combined heat and power generation system according to claim 1, wherein The solar PVT power generation and PVT heat pump heating mode of the cogeneration system: the third electric valve (8), the fourth electric valve (9), the seventh electric valve (13), the eighth electric valve (14), the first water pump (6), the second water pump (15), the terminal radiator system (7), the heating heat pump unit (10), and the solar heat exchange unit (16) are turned on; in winter, the solar PVT array (18) converts solar energy into AC power through the inverter (19) for use by electrical equipment or is connected to the power grid; the solar radiation heat energy and air heat energy absorbed by the solar PVT array (18) are exchanged through the solar heat exchange unit (16) and then transported to the heating heat pump unit (10) as a low-grade heat source by the second water pump (15). The heat pump unit uses the reverse Carnot principle to upgrade it to a high-grade heat source, and produces 60°C hot water for use by the terminal radiator system (7).

8. The cogeneration system according to claim 1, wherein, Solar PVT power generation and municipal heat source heating mode of the cogeneration system: the municipal primary heating network (1), the plate heat exchanger (2), the first electric valve (4), the second electric valve (5), the first water pump (6), and the terminal radiator system (7) are turned on; in winter, the solar PVT array (18) converts solar energy into AC power through the inverter (19) for use by electrical equipment or is connected to the power grid; the municipal primary heating network (1) uses the plate heat exchanger (2) to convert it into 60°C hot water, which is used by the first water pump (6) for use by the terminal radiator system (7).

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