Photovoltaic heat pump energy storage and supply system

Abstract

The utility model discloses a photovoltaic heat pump energy storage and supply system which comprises a power grid, a distributed photovoltaic power station, an energy storage power station, a water source heat pump unit, a heat storage container and a cold storage container. A second switch is connected between the power output end of the distributed photovoltaic power station and the power grid, the power output end of the distributed photovoltaic power station and the power input end of the energy storage power station are connected with a third switch, and the power output end of the energy storage power station and the power input end of the water source heat pump unit are connected with a fourth switch. A fifth switch is connected between the power grid and the power input end of the water source heat pump unit, and a sixth switch is connected between the power output end of the energy storage power station and the power grid. Through the arrangement of the first switch to the sixth switch, the electric energy generated by the distributed photovoltaic power station can be switched among the energy storage power station, the water source heat pump unit and the power grid in multiple operation modes, the diversification of the operation modes is increased, and the electric power is reasonably utilized.

Description

Technical Field

[0001] This utility model relates to a photovoltaic heat pump energy storage and supply system. Background Technology

[0002] Solar energy is a green, renewable, and clean energy source. Solar energy systems are not only energy-efficient and cost-effective, but also do not pollute the environment. Photovoltaic (PV) power generation involves photovoltaic (PV) panels receiving sunlight and converting it into electrical energy. This electricity can be used in grid-connected applications and also serves as energy storage. With the development of water source heat pump technology for centralized building power supply, to reduce the reliance on grid electricity for water source heat pumps, photovoltaic power generation can be used to provide power to the water source heat pumps. Further research is needed on the combined use of photovoltaics and water source heat pumps to enable both systems to operate successfully. Utility Model Content

[0003] To address the aforementioned technical problems, the purpose of this utility model is to provide a photovoltaic heat pump energy storage and supply system.

[0004] To achieve the above objectives, this utility model provides the following technical solution:

[0005] A photovoltaic heat pump energy storage system includes a power grid, a distributed photovoltaic power station, an energy storage power station, a water source heat pump unit, a thermal storage container, and a cold storage container. The power output terminal of the distributed photovoltaic power station is connected to the power input terminal of the water source heat pump unit via a first switch.

[0006] A second switch connects the power output terminal of a distributed photovoltaic power station to the power grid.

[0007] A third switch connects the power output terminal of the distributed photovoltaic power station to the power input terminal of the energy storage power station.

[0008] A fourth switch is connected between the power output terminal of the energy storage power station and the power input terminal of the water source heat pump unit.

[0009] A fifth switch is connected to the power input terminal of the power grid and the water source heat pump unit.

[0010] A sixth switch connects the power output terminal of the energy storage power station to the power grid;

[0011] The heat source side water intake pipe of the water source heat pump unit is connected in parallel with the heat storage container and the cold storage container;

[0012] The heat source side return water pipe of the water source heat pump is connected in parallel with the heat storage container and the cold storage container.

[0013] In a further embodiment, the distributed photovoltaic power station includes several distributed photovoltaic panels, a combiner box, and a first power monitoring sensor. The several distributed photovoltaic panels are electrically connected to the wiring input of the combiner box, and the wiring output of the combiner box is connected to the first power monitoring sensor.

[0014] A second power monitoring sensor is connected to the power input end of the energy storage power station, and a third power monitoring sensor is connected to the power output end of the energy storage power station.

[0015] In a further implementation, a first inverter is connected to the power output terminal of the energy storage power station, a second inverter is connected between the distributed photovoltaic power station and the power grid, and a third inverter is connected to the power input terminal of the water source heat pump unit.

[0016] In a further embodiment, a heat storage water outlet control valve is installed at the outlet end of the heat storage container, a cold storage water outlet control valve is installed at the outlet end of the cold storage container, and a heat source side water intake control valve and a water intake pump are installed on the heat source side water intake pipe of the water source heat pump unit.

[0017] In a further embodiment, a first temperature sensor is installed on the water intake pipe on the heat source side of the water source heat pump unit, a second temperature sensor is installed on the heat source side inlet of the water source heat pump unit, a third temperature sensor is installed on the heat storage container, and a fourth temperature sensor is installed on the cold storage container.

[0018] In a further embodiment, a thermal storage water inlet control valve is installed at the water inlet end of the thermal storage container, a cold storage water inlet control valve is installed at the water inlet end of the cold storage container, and a thermal source side return water control valve is installed on the heat source side return water pipe of the water source heat pump unit.

[0019] The inlet end of the thermal storage container and the inlet end of the cold storage container are connected in parallel with the return water pipe on the heat source side of the water source heat pump unit, and a heat exchanger is arranged thereon, which is located outdoors.

[0020] As a further embodiment, a fifth temperature sensor is installed at the heat source side outlet of the water source heat pump unit.

[0021] In a further embodiment, the heat storage container and the cold storage container are stainless steel metal containers buried underground.

[0022] By adopting the above technical solution, during the winter and summer operation of the water source heat pump unit, an energy storage power station is used to supply power to the water source heat pump unit. That is, the third and fourth switches are closed, and the other switches are opened to minimize the use of grid power. When the power in the energy storage power station is lower than the set power, the fifth switch is closed first, and then the fourth switch is opened, and the grid is used to supply power to the water source heat pump unit, thereby ensuring a stable power supply to the water source heat pump unit and ensuring the operational stability of the water source heat pump unit.

[0023] When the water source heat pump unit is shut down during the spring and autumn seasons, the first switch can be directly closed to perform regular power-on maintenance on the water source heat pump unit; the electricity generated by the distributed photovoltaic power station is used to store energy for the energy storage power station by closing the third switch. When the energy storage power station reaches the set power level, the second switch can be closed to directly connect the power to the grid.

[0024] By setting up the first to sixth switches, the electricity generated by the distributed photovoltaic power station can be switched between multiple operating modes between the energy storage power station, the water source heat pump unit and the power grid, increasing the diversity of operating modes and making rational use of electricity. Attached Figure Description

[0025] Figure 1 This is a connection diagram of the present invention;

[0026] The labels in the attached diagram represent the following:

[0027] 1. Power grid; 2. Distributed photovoltaic power station; 3. Energy storage power station; 4. Water source heat pump unit; 5. Thermal storage container; 6. Cold storage container; 7. Distributed photovoltaic panel; 8. Combiner box; 9. First power monitoring sensor; 10. Second power monitoring sensor; 11. Third power monitoring sensor; 12. First inverter; 13. Second inverter; 14. Third inverter; 15. Heat source side water intake pipe; 16. Heat source side water return pipe; 17. Thermal storage water outlet control valve; 18. Cold storage water outlet control valve; 19. Heat source side water intake control valve; 20. Water intake pump; 21. Thermal storage water inlet control valve; 22. Cold storage water inlet control valve; 23. Heat source side water return control valve; 24. Heat exchanger; 25. First temperature sensor; 26. Second temperature sensor; 27. Third temperature sensor; 28. Fourth temperature sensor; 29. ​​Fifth temperature sensor. Detailed Implementation

[0028] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0029] See Figure 1As shown, the photovoltaic heat pump energy storage system is mainly suitable for photovoltaic power supply and heat pump power supply in buildings, such as factories and residential areas. The photovoltaic heat pump energy storage system includes a power grid 1, a distributed photovoltaic power station 2, an energy storage power station 3, a water source heat pump unit 4, a thermal storage container 5, and a cold storage container 6. The power grid 1 is the power grid of the location where the system is put into use. The distributed photovoltaic power station 2 is installed on the roof and / or walls of the building to convert solar energy into electrical energy for power output. The water source heat pump unit 4 uses water as the heat source medium; the water source can be groundwater, river water, lake water, etc. The water source heat pump unit 4 can be installed under the building, such as in the basement. The thermal storage container 5 and the cold storage container 6 are relatively sealed containers, each with its own water storage space. The water source heat pump unit 4 contains multiple water source heat pumps connected in parallel, and the energy storage power station 3 contains multiple energy storage cabinets connected in parallel.

[0030] The power output terminal of the distributed photovoltaic power station 2 is connected to the power input terminal of the water source heat pump unit 4 via a first switch S1. When the first switch S1 is closed, the power output of the distributed photovoltaic power station 2 is transmitted to the water source heat pump unit 4, and the water source heat pump unit 4 is powered. When the first switch S1 is open, the power transmission from the distributed photovoltaic power station 2 to the water source heat pump unit 4 is cut off.

[0031] A second switch S2 is connected between the power output terminal of the distributed photovoltaic power station 2 and the power grid 1. When the second switch S2 is closed, the power of the distributed photovoltaic power station 2 is fed into the power grid 1 and used by users of the power grid 1. When the second switch S2 is open, the grid connection between the distributed photovoltaic power station 2 and the power grid 1 is cut off.

[0032] A third switch S3 is connected to the power output terminal of the distributed photovoltaic power station 2 and the power input terminal of the energy storage power station 3. When the third switch S3 is closed, the power of the distributed photovoltaic power station 2 is transmitted to the energy storage power station 3, and the energy storage power station 3 stores the power generated by the distributed photovoltaic power station 2 for later use. When the third switch S3 is open, the power transmission from the distributed photovoltaic power station 2 to the energy storage power station 3 is cut off.

[0033] The power output terminal of the energy storage power station 3 is connected to the power input terminal of the water source heat pump unit 4 via a fourth switch S4. When the fourth switch S4 is closed, the power stored in the energy storage power station 3 can supply power to the water source heat pump unit 4. When the fourth switch S4 is open, the power supply from the energy storage power station 3 to the water source heat pump unit 4 is cut off.

[0034] A fifth switch S5 is connected to the power input terminal of the power grid 1 and the water source heat pump unit 4. When the fifth switch S5 is closed, the power grid 1 supplies power to the water source heat pump unit 4. When the fifth switch S5 is open, the power grid 1 cuts off the power supply to the water source heat pump unit 4.

[0035] A sixth switch S6 is connected between the power output terminal of the energy storage power station 3 and the power grid 1. When the sixth switch S6 is closed, the power stored in the energy storage power station 3 is connected to the power grid 1 for use. When the sixth switch S6 is open, the power of the energy storage power station 3 is cut off and connected to the power grid 1.

[0036] During the winter and summer operation of the water source heat pump unit 4, the energy storage station 3 is used to supply power to the water source heat pump unit 4. That is, the third switch S3 and the fourth switch S4 are closed, and other switches are opened to minimize the use of power from the grid 1. When the power in the energy storage station 3 is lower than the set power (due to weather conditions, the power generation of the distributed photovoltaic power station 2 is insufficient, and the power in the energy storage station 3 is low), the fifth switch S5 is closed first, and then the fourth switch S4 is opened, and the grid 1 is used to supply power to the water source heat pump unit 4, thereby providing a stable power supply to the water source heat pump unit 4 and ensuring the operational stability of the water source heat pump unit 4.

[0037] During periods when the water source heat pump unit 4 is out of service (such as spring and autumn), the water source heat pump unit 4 can be periodically powered on for maintenance by directly closing the first switch S1; the electricity generated by the distributed photovoltaic power station 2 is used to store energy for the energy storage power station 3 by closing the third switch S3. When the energy storage power station 3 reaches the set power level, the power can be directly connected to the grid by closing the second switch S2.

[0038] By setting the first switch S1 to the sixth switch S6, the electricity generated by the distributed photovoltaic power station 2 can be switched between multiple operating modes between the energy storage power station 3, the water source heat pump unit 4 and the power grid 1, increasing the diversity of operating modes and making rational use of electricity.

[0039] The distributed photovoltaic power station 2 includes several distributed photovoltaic panels 7, a combiner box 8, and a first power monitoring sensor 9. The distributed photovoltaic panels 7 are electrically connected to the wiring input of the combiner box 8, and the wiring output of the combiner box 8 is connected to the first power monitoring sensor 9. The distributed photovoltaic panels 7 are used to receive sunlight and convert light energy into electrical energy. The combiner box 8 is used to supply the distributed photovoltaic panels 7. The first power monitoring sensor 9 is used to monitor the electrical energy generated by the distributed photovoltaic power station 2, such as using a Hall sensor. A second power monitoring sensor 10 is connected to the power input of the energy storage power station 3 to monitor the amount of electricity flowing into the energy storage power station 3. A third power monitoring sensor 11 is connected to the power output of the energy storage power station 3 to monitor the amount of electricity supplied by the energy storage power station 3. The remaining electricity in the energy storage power station 3 can be obtained through the second power monitoring sensor 10 and the third power monitoring sensor 11.

[0040] Among them, a first inverter 12 is connected to the power output end of the energy storage power station 3. The first inverter 12 is an energy storage inverter to facilitate monitoring of the status of the energy storage battery in the energy storage power station 3. A second inverter 13 is connected between the distributed photovoltaic power station 2 and the power grid 1. A third inverter 14 is connected to the power input end of the water source heat pump unit 4. The second inverter 13 and the third inverter 14 are photovoltaic inverters to convert the DC generated by the photovoltaic into AC for use.

[0041] The thermal storage container 5 and the cold storage container 6 are stainless steel metal containers buried about 10 meters underground, and are protected by an epoxy coal tar paint layer on the outside of the containers.

[0042] The heat source side water intake pipe 15 of the water source heat pump unit 4 is connected in parallel with the heat storage container 5 and the cold storage container 6. That is, the heat source side water intake of the water source heat pump unit 4 can be taken from the heat storage container 5 / cold storage container 6 and other water intake points and sent to the heat source side of the water source heat pump unit 4. The heat source side return water pipe 16 of the water source heat pump is connected in parallel with the heat storage container 5 and the cold storage container 6. The return water of the water source heat pump unit 4 can flow back to the heat storage container 5 / cold storage container 6, or it can be discharged directly through the heat source side return water pipe 16.

[0043] A thermal storage water outlet control valve 17 is installed at the outlet of the thermal storage container 5, and a cold storage water outlet control valve 18 is installed at the outlet of the cold storage container 6. A thermal source side water intake control valve 19 and a water intake pump 20 are installed on the heat source side water intake pipe 15 of the water source heat pump unit 4. When the water source heat pump unit 4 is running, such as in summer, the heat source side water intake pipe 15 obtains water from the water intake point, but the temperature is higher than the set temperature. At this time, the cold storage water outlet control valve 18 can be opened to allow the low-temperature water in the cold storage container 6 to enter the water in the heat source side water intake pipe 15 for mixing, so that the water temperature entering the heat source side of the water source heat pump unit 4 is suitable. In winter, when the water temperature obtained from the water intake point by the heat source side water intake pipe 15 is lower than the set temperature, the thermal storage water outlet control valve 17 can be opened to allow the high-temperature water in the thermal storage container 5 to mix with it, so as to ensure the supply water temperature entering the heat source side of the water source heat pump unit 4.

[0044] A thermal storage water inlet control valve 21 is installed at the water inlet end of the thermal storage container 5, and a cold storage water inlet control valve 22 is installed at the water inlet end of the cold storage container 6. A heat source side return water control valve 23 is installed on the heat source side return water pipe 16 of the water source heat pump unit 4. The water inlet ends of the thermal storage container 5 and the cold storage container 6 are connected in parallel with the heat source side return water pipe 16 of the water source heat pump unit 4, and a heat exchanger 24 is arranged thereon. The heat exchanger 24 is located outdoors. In summer, when the water source heat pump unit 4 is running, after the return water temperature of the water source heat pump unit 4 decreases, part of it flows back from the heat source side return water pipe 16, and part of it can enter the secondary side of the heat exchanger 24 to exchange heat with the high-temperature fluid (high-temperature air in summer or high-temperature water after sunshine) introduced into the primary side of the heat exchanger 24, thus raising its temperature. By opening the heat storage inlet water control valve 21, the heated water is sent into the heat storage container 5 for storage, in order to provide a certain high-temperature water source for the operation of the water source heat pump unit 4 in winter. In winter, when the water source heat pump unit 4 is running, after the return water temperature of the water source heat pump unit 4 decreases, part of it flows back from the heat source side return water pipe 16, and part of it... The fluid can enter the secondary side of heat exchanger 24 and exchange heat with the low-temperature fluid (low-temperature air or water in winter) introduced into the primary side of heat exchanger 24, causing its temperature to drop. By opening the cold storage water inlet control valve 22, the cooled water is sent into the cold storage container 6 for storage, so as to provide a certain low-temperature water source for the water source heat pump unit 4 in summer. Through the above, the operating stability of the water source heat pump unit 4 can be improved. By using the fluid of the operating season on the primary side of heat exchanger 24 to exchange heat with the return water on the heat source side of the water source heat pump unit 4, and storing it in the heat storage container 5 / cold storage container 6, there is no need to use additional electric heating / cooling auxiliary equipment, reducing equipment investment.

[0045] Liquid level sensors are installed in the heat storage container 5 and the cold storage container 6, and drainage pipes are connected to each other. When the water level reaches the set value, the water can be discharged from the container through the drainage pipe. The drainage pipe can be drained to the ground and pumped out by a water pump.

[0046] A first temperature sensor 25 is installed on the heat source side water intake pipe 15 of the water source heat pump unit 4 to monitor the water temperature inside the water intake pipe 15. A second temperature sensor 26 is installed at the heat source side inlet of the water source heat pump unit 4 to monitor the water temperature entering the heat source side. A third temperature sensor 27 is installed on the heat storage container 5 to monitor the water temperature inside the heat storage container 5. A fourth temperature sensor 28 is installed on the cold storage container 6 to monitor the water temperature inside the cold storage container 6. A fifth temperature sensor 29 is installed at the heat source side outlet of the water source heat pump unit 4 to monitor the return water temperature at the heat source side outlet. By using these temperature sensors, the water temperature at each pipe location can be monitored in a timely manner to understand the operating status of the water source heat pump unit 4.

[0047] Finally, it should be noted that the above are merely preferred embodiments of this utility model and are not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A photovoltaic heat pump energy storage system, comprising a power grid, a distributed photovoltaic power station, an energy storage power station, a water source heat pump unit, a thermal storage container, and a cold storage container, characterized in that, The power output terminal of the distributed photovoltaic power station is connected to the power input terminal of the water source heat pump unit via a first switch. A second switch connects the power output terminal of a distributed photovoltaic power station to the power grid. A third switch connects the power output terminal of the distributed photovoltaic power station to the power input terminal of the energy storage power station. A fourth switch is connected between the power output terminal of the energy storage power station and the power input terminal of the water source heat pump unit. A fifth switch is connected to the power input terminal of the power grid and the water source heat pump unit. A sixth switch connects the power output terminal of the energy storage power station to the power grid; The heat source side water intake pipe of the water source heat pump unit is connected in parallel with the heat storage container and the cold storage container; The heat source side return water pipe of the water source heat pump is connected in parallel with the heat storage container and the cold storage container.

2. The photovoltaic heat pump energy storage and supply system as described in claim 1, characterized in that, A distributed photovoltaic power station includes several distributed photovoltaic panels, a combiner box, and a first power monitoring sensor. The distributed photovoltaic panels are electrically connected to the wiring input of the combiner box, and the wiring output of the combiner box is connected to the first power monitoring sensor. A second power monitoring sensor is connected to the power input end of the energy storage power station, and a third power monitoring sensor is connected to the power output end of the energy storage power station.

3. The photovoltaic heat pump energy storage and supply system as described in claim 1, characterized in that, The first inverter is connected to the power output end of the energy storage power station, the second inverter is connected between the distributed photovoltaic power station and the power grid, and the third inverter is connected to the power input end of the water source heat pump unit.

4. The photovoltaic heat pump energy storage and supply system as described in claim 1, characterized in that, The outlet end of the thermal storage container is equipped with a thermal storage water outlet control valve, the outlet end of the cold storage container is equipped with a cold storage water outlet control valve, and the heat source side water intake pipe of the water source heat pump unit is equipped with a heat source side water intake control valve and a water intake pump.

5. The photovoltaic heat pump energy storage and supply system as described in claim 4, characterized in that, A first temperature sensor is installed on the water intake pipe on the heat source side of the water source heat pump unit, a second temperature sensor is installed on the heat source side inlet of the water source heat pump unit, a third temperature sensor is installed on the heat storage container, and a fourth temperature sensor is installed on the cold storage container.

6. The photovoltaic heat pump energy storage and supply system as described in claim 4, characterized in that, A thermal storage inlet control valve is installed at the inlet end of the thermal storage container, and a cold storage inlet control valve is installed at the inlet end of the cold storage container. A thermal source side return water control valve is installed on the return water pipe of the water source heat pump unit. The inlet end of the thermal storage container and the inlet end of the cold storage container are connected in parallel with the return water pipe on the heat source side of the water source heat pump unit, and a heat exchanger is arranged thereon, which is located outdoors.

7. The photovoltaic heat pump energy storage and supply system as described in claim 6, characterized in that, A fifth temperature sensor is installed at the heat source side outlet of the water source heat pump unit.

8. The photovoltaic heat pump energy storage and supply system as described in claim 1, characterized in that, Thermal storage containers and cold storage containers are stainless steel metal containers buried underground.

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