Off-grid distributed solar photovoltaic power generation energy storage place cold storage

Abstract

The invention relates to an off-grid distributed solar photovoltaic power generation and energy storage origin refrigeration house, which comprises a photovoltaic power generation system and a refrigeration house system, the photovoltaic power generation system comprises a photovoltaic module, the photovoltaic module is connected with an MPPT controller through a cable, the output end of the MPPT controller is connected with an inverter through a cable, and the inverter is connected with the refrigeration house system through a cable. The output end of the inverter is further connected with an energy storage battery through a cable, and the output end of the inverter is connected with a refrigeration house system through a cable. The maximum power point of the photovoltaic power generation system is captured through the MPPT controller, the real-time photovoltaic power generation amount is controlled to be distributed to the energy storage system and the refrigeration house refrigeration system, control over the matching relation among the photovoltaic power generation amount, the energy storage system power supply and demand amount and the refrigeration house power consumption amount is achieved, and refrigeration house cooling safety is guaranteed; the cold storage application of a one-kilometer cold storage in a fruit and vegetable production place is realized, the integrity of cold-chain logistics is promoted, and the requirements of optimal economic benefits and carbon emission reduction benefits are realized on the premise of ensuring cold supply safety.

Description

Technical Field

[0001] The invention relates to the technical field of cold storage, and in particular to an off-grid distributed solar photovoltaic power generation and energy storage cold storage. Background Art

[0002] Cold storage refers to the use of artificial means to create an environment with different temperature or humidity from the outdoor environment. It is also a constant temperature and humidity storage equipment for food, liquids, chemicals, medicines, vaccines, scientific experiments, etc. Cold storage is usually located near the transportation port or the place of origin. Compared with refrigerators, cold storage has a larger refrigeration area and shares the same refrigeration principle.

[0003] For example, an energy-saving cold storage proposed in 202211289771.8 utilizes a retractable transfer room connected to the warehouse door to form a transition space at the warehouse door when entering and exiting the warehouse, thereby preventing excessive cold air from leaking from the door of the cold storage room. The transfer room can adjust its size according to the needs of different materials entering and exiting, thereby avoiding occupying a larger warehouse space and preventing leakage of cold air.

[0004] However, traditional cold storage usually uses electricity or fuel as a power source, which not only consumes a lot of energy, but also causes certain pollution to the environment. Especially in fruit and vegetable producing areas in remote areas, due to insufficient or unstable power supply, traditional cold storage is difficult to meet long-term and stable refrigeration needs. In addition, traditional cold storage lacks effective regulation and management mechanisms in energy utilization, and often wastes energy. In order to solve the above problems, it has become an urgent need to develop off-grid distributed solar photovoltaic power generation and energy storage cold storage in production areas. Summary of the invention

[0005] In view of the shortcomings of the existing technology, the present invention provides an off-grid distributed solar photovoltaic power generation and energy storage cold storage, which can effectively utilize solar energy as a renewable energy source, reduce dependence on fossil energy, reduce environmental pollution, and achieve a stable supply of energy through the energy storage system to ensure the long-term and stable operation of the cold storage in remote areas. At the same time, the technology also uses intelligent equipment such as MPPT controllers to achieve intelligent matching and coordination between photovoltaic power generation systems, energy storage systems and cold storage refrigeration systems, further improve energy utilization efficiency, and achieve optimal economic benefits and carbon emission reduction benefits.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: an off-grid distributed solar photovoltaic power generation and energy storage cold storage, comprising a photovoltaic power generation system and a cold storage system, wherein the photovoltaic power generation system comprises a photovoltaic module, wherein the photovoltaic module is connected to an MPPT controller via a cable, wherein the output end of the MPPT controller is connected to an inverter via a cable, wherein the output end of the inverter is also connected to an energy storage battery via a cable, and the output end of the inverter is connected to the cold storage system via a cable;

[0007] The cold storage system includes a compressor, wherein the cold storage system is provided with a compressor, an evaporator, a throttle valve and a condenser, wherein the output end of the compressor is provided with a first solenoid valve, a second solenoid valve, a third solenoid valve and a fourth solenoid valve, wherein the first solenoid valve, the second solenoid valve, the third solenoid valve and the fourth solenoid valve are respectively connected to a first freezing room, a second freezing room, a third freezing room and a fourth freezing room provided inside the cold storage system, and a delivery pipeline is inserted between the first freezing room, the second freezing room, the third freezing room and the fourth freezing room;

[0008] The conveying pipeline includes a temperature compensation pipeline, a conveying cylinder is fixedly installed at the bottom of the temperature compensation pipeline, a leakage net is fixedly installed at the bottom of the conveying cylinder, sealing plates are movably installed inside the temperature compensation pipeline and on the left and right sides of the conveying cylinder, temperature sensors are fixedly installed on the top and bottom of the temperature compensation pipeline, rotating shafts are fixedly installed on the left and right sides of the sealing plate, a driving motor is fixedly installed inside the temperature compensation pipeline, and a transmission wheel is fixedly installed on the output end of the driving motor.

[0009] Preferably, the MPPT controller directly supplies part of the electric energy generated by the photovoltaic module to the energy storage battery, and converts the other part of the electric energy into alternating current through an inverter to supply the cold storage system.

[0010] Preferably, the energy storage system is composed of a bidirectional DC / DC converter and a battery. The bidirectional DC / DC converter is connected in parallel to the DC bus of the inverter to control the charging and discharging of the battery.

[0011] Preferably, the compressor, evaporator, throttle valve and condenser are cooled by alternating current, the evaporator absorbs indoor heat of the cold storage to provide cooling capacity; the condenser is located outdoors to discharge heat from the cold storage.

[0012] Preferably, both ends of the temperature compensation pipe sequentially pass through the first freezing room, the second freezing room, the third freezing room and the fourth freezing room, and the conveying cylinder is respectively located inside the first freezing room, the second freezing room, the third freezing room and the fourth freezing room.

[0013] Preferably, the sealing plate is arranged at an angle, and the outer surface of the sealing plate is tightly fitted to the inner wall of the temperature compensation pipe.

[0014] Preferably, the temperature sensors are located on the left and right sides of the sealing plate and are arranged in an up-and-down staggered manner.

[0015] Preferably, installation grooves are provided on both left and right sides of the inner wall of the temperature compensation pipe, and the rotating shaft is rotatably installed inside the installation grooves.

[0016] Preferably, the drive motor is fixedly installed on the left side of the temperature compensation pipe, and the drive motor is located below the rotating shaft, and the transmission wheel and the rotating shaft are meshed with each other.

[0017] Compared with the prior art, the technical solution of this application has the following beneficial effects:

[0018] 1. The present invention utilizes solar photovoltaic power generation technology to achieve energy self-sufficiency in cold storage in remote areas, no longer relying on external power grids, and solving the problem of insufficient or unstable power supply. Environmental protection and energy saving: The use of clean energy solar energy significantly reduces carbon emissions and reduces pollution to the environment. At the same time, by intelligently adjusting the photovoltaic power generation and energy storage system power supply, energy utilization efficiency is improved and energy consumption is reduced. Strong stability: Through the design of the energy storage system and the application of the MPPT controller, a stable supply of energy and continuous refrigeration of the cold storage are achieved, ensuring the refrigeration quality of fruits and vegetables and the integrity of the cold chain logistics. Significant economic benefits: Reduced the operating costs of the cold storage and improved economic benefits. At the same time, it conforms to the green and low-carbon development concept, and is conducive to promoting the sustainable development of the industry and other beneficial effects.

[0019] 2. The present invention uses an MPPT controller to capture the maximum power point of the photovoltaic power generation system, and controls the real-time photovoltaic power generation to be distributed to the energy storage system and the cold storage refrigeration system, thereby controlling the matching relationship between photovoltaic power generation, energy storage system power supply and demand, and cold storage power consumption, and ensuring the safety of cold storage cooling. The cold storage application of one kilometer of fruit and vegetable production areas is realized to promote the integrity of cold chain logistics. The requirements for achieving the best economic benefits and carbon emission reduction benefits are achieved under the premise of ensuring the safety of cooling. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the structure of the present invention;

[0021] Figure 2 It is a front cross-sectional view of the cold storage system of the present invention;

[0022] Figure 3 It is a right side cross-sectional view of the delivery pipeline of the present invention;

[0023] Figure 4 It is a front cross-sectional view of the conveying pipeline of the present invention.

[0024] In the figure: 1. Photovoltaic module; 2. MPPT controller; 3. Energy storage battery; 4. Inverter; 5. Compressor; 6. Evaporator; 7. Throttle valve; 8. Condenser; 9. First solenoid valve; 10. Second solenoid valve; 11. Third solenoid valve; 12. Fourth solenoid valve; 13. First freezer; 14. Second freezer; 15. Third freezer; 16. Fourth freezer; 17. Conveying pipeline; 1701. Temperature compensation pipeline; 1702. Conveying cylinder; 1703. Net; 1704. Sealing plate; 1705. Temperature sensor; 1706. Rotating shaft; 1707. Driving motor; 1708. Transmission wheel. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] See also Figure 1-4 In this embodiment, an off-grid distributed solar photovoltaic power generation and energy storage cold storage includes a photovoltaic power generation system and a cold storage system. The photovoltaic power generation system includes a photovoltaic module 1, the photovoltaic module 1 is connected to the MPPT controller 2 through a cable, the output end of the MPPT controller 2 is connected to the inverter 4 through a cable, the output end of the inverter 4 is also connected to the energy storage battery 3 through a cable, and the output end of the inverter 4 is connected to the cold storage system through a cable;

[0027] The cold storage system includes a compressor 5, and the cold storage system is provided with the compressor 5, an evaporator 6, a throttle valve 7 and a condenser 8. The output end of the compressor 5 is provided with a first solenoid valve 9, a second solenoid valve 10, a third solenoid valve 11 and a fourth solenoid valve 12. The first solenoid valve 9, the second solenoid valve 10, the third solenoid valve 11 and the fourth solenoid valve 12 are respectively connected to a first freezing room 13, a second freezing room 14, a third freezing room 15 and a fourth freezing room 16 arranged inside the cold storage system. A delivery pipeline 17 is inserted between the first freezing room 13, the second freezing room 14, the third freezing room 15 and the fourth freezing room 16;

[0028] The conveying pipeline 17 includes a temperature compensation pipeline 1701, a conveying cylinder 1702 is fixedly installed at the bottom of the temperature compensation pipeline 1701, a leakage net 1703 is fixedly installed at the bottom of the conveying cylinder 1702, sealing plates 1704 are movably installed inside the temperature compensation pipeline 1701 and on the left and right sides of the conveying cylinder 1702, temperature sensors 1705 are fixedly installed on the top and bottom of the temperature compensation pipeline 1701, rotating shafts 1706 are fixedly installed on the left and right sides of the sealing plate 1704, a driving motor 1707 is fixedly installed inside the temperature compensation pipeline 1701, and a transmission wheel 1708 is fixedly installed on the output end of the driving motor 1707.

[0029] In this embodiment, the solar photovoltaic module 1 optimizes the output through the MPPT controller 2 to improve the conversion efficiency. Part of the electric energy is directly stored, and part of it is supplied to the cold storage refrigeration system after inversion. The MPPT controller 2 also protects the battery safety and provides stable power supply. The energy storage system consists of a bidirectional DC / DC converter and a battery, which adjusts the charge and discharge according to the photovoltaic power. The cold storage refrigeration unit adjusts the power according to the cold load, supplies frozen and refrigerated storage through pipelines, and keeps the fruits and vegetables fresh.

[0030] Solar photovoltaic power generation system: consists of multiple solar photovoltaic modules 1, which are used to absorb solar energy and convert it into electrical energy.

[0031] Energy storage system: includes a bidirectional DC / DC converter and batteries for storing and releasing electrical energy.

[0032] Cold storage refrigeration system: includes compressor 5, evaporator 6, condenser 8, throttle valve 7 and other auxiliary equipment, used to provide cooling capacity and maintain the temperature of the cold storage.

[0033] MPPT controller 2: used to capture and control the maximum power point of the photovoltaic power generation system.

[0034] Working process: Solar photovoltaic module 1 absorbs solar energy and converts it into electrical energy. MPPT controller 2 monitors the temperature and light intensity of the photovoltaic panel, adjusts the voltage and current output, and ensures that the photovoltaic panel operates at the maximum power point. Part of the electricity generated by photovoltaic power generation is directly supplied to the energy storage system, and the other part is converted by inverter 4 to supply the cold storage refrigeration system. MPPT controller 2 also provides protection energy supply, realizes current limiting, and ensures the safety of the battery.

[0035] Energy storage system control: The bidirectional DC / DC converter controls the charging and discharging of the battery according to the power information sent by the photovoltaic array. When the power sent by the photovoltaic module 1 is greater than the demand of the refrigeration unit, the energy storage battery 3 is charged. When the power sent by the photovoltaic module 1 is less than the demand of the refrigeration unit, the energy storage battery 3 is discharged.

[0036] Cold storage refrigeration system adjustment: select the corresponding refrigeration unit power, energy storage system capacity and photovoltaic power generation system power generation according to the cold load demand. The cold energy generated by the refrigeration unit is supplied to the freezing room and cold storage room through pipelines. The cold energy supply is controlled by solenoid valves to achieve cold supply safety and maintain the freezing and refrigeration of fruits and vegetables.

[0037] Economic benefits and carbon emission reduction: Achieve optimal economic benefits by rationally adjusting the supply and demand relationship between photovoltaic power generation, power storage and power consumption systems. Use solar power to reduce dependence on traditional energy and reduce environmental pollution.

[0038] System optimization: According to different cold storage loads or incoming goods, select appropriate refrigeration units, energy storage systems and photovoltaic power generation systems to ensure the best economic benefits of the cold storage.

[0039] In this embodiment, a temperature compensation pipe 1701 is arranged between the first freezer 13, the second freezer 14, the third freezer 15 and the fourth freezer 16, and an inclined sealing plate 1704 is arranged inside the temperature compensation pipe 1701. The sealing plate 1704 is tightly fitted to the inner wall of the temperature compensation pipe 1701, and the temperature sensor 1705 is located on both sides of the sealing plate 1704. Installation grooves are provided on the left and right sides of the inner wall of the temperature compensation pipe 1701, and the rotating shaft 1706 is rotatably installed inside the installation groove. The driving motor 1707 is fixedly installed on the left side of the temperature compensation pipe 1701, and the driving motor 1707 is located below the rotating shaft 1706, and the transmission wheel 1708 is meshed with the rotating shaft 1706.

[0040] By adopting the above technical solution, when the cold storage is working, due to the different storage items and switching times of the first freezer 13, the second freezer 14, the third freezer 15 and the fourth freezer 16, there will be temperature differences. At this time, the temperature sensor 1705 will detect the temperature difference on both sides of the sealing plate 1704, and then the output shaft of the drive motor 1707 will drive the rotating shaft 1706 to rotate, and the sealing plate 1704 will be driven by the rotating shaft 1706 to rotate, and the cold air will circulate between the two adjacent conveying cylinders 1702 to transfer the cold air to the inside of the conveying cylinder 1702 with high temperature, so as to perform cold compensation for different freezer rooms and balance the temperature of each freezer room. There is no need to adjust the temperature change to achieve a small range of temperature change, reduce power consumption, and achieve the effect of saving resources.

[0041] In summary, the present invention uses solar photovoltaic power generation technology to achieve energy self-sufficiency in remote areas of cold storage, no longer relying on external power grids, and solves the problem of insufficient or unstable power supply. Environmental protection and energy saving: The use of clean energy solar energy significantly reduces carbon emissions and reduces pollution to the environment. At the same time, by intelligently adjusting the photovoltaic power generation and energy storage system supply, the energy utilization efficiency is improved and energy consumption is reduced. Strong stability: Through the design of the energy storage system and the application of the MPPT controller 2, a stable supply of energy and continuous refrigeration of the cold storage are achieved, ensuring the refrigeration quality of fruits and vegetables and the integrity of the cold chain logistics. Significant economic benefits: Reduce the operating cost of the cold storage and improve economic benefits. At the same time, it conforms to the green and low-carbon development concept and is conducive to promoting the sustainable development of the industry and other beneficial effects. The maximum power point of the photovoltaic power generation system is captured by the MPPT controller 2, and the real-time photovoltaic power generation is controlled and allocated to the energy storage system and the cold storage refrigeration system, so as to realize the control of the matching relationship between photovoltaic power generation, energy storage system supply and demand power and cold storage power consumption, and ensure the safety of cold storage refrigeration. Realize the cold storage application of one kilometer of the fruit and vegetable production area and promote the integrity of the cold chain logistics. The demand for achieving optimal economic benefits and carbon emission reduction benefits while ensuring cooling safety.

[0042] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0043] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An off-grid distributed solar photovoltaic power generation and energy storage cold storage, comprising a photovoltaic power generation system and a cold storage system, characterized in that: The photovoltaic power generation system comprises a photovoltaic module (1), the photovoltaic module (1) is connected to an MPPT controller (2) via a cable, the output end of the MPPT controller (2) is connected to an inverter (4) via a cable, the output end of the inverter (4) is also connected to an energy storage battery (3) via a cable, and the output end of the inverter (4) is connected to a cold storage system via a cable; The cold storage system comprises a compressor (5), wherein the cold storage system is provided with a compressor (5), an evaporator (6), a throttle valve (7) and a condenser (8); the output end of the compressor (5) is provided with a first solenoid valve (9), a second solenoid valve (10), a third solenoid valve (11) and a fourth solenoid valve (12); the first solenoid valve (9), the second solenoid valve (10), the third solenoid valve (11) and the fourth solenoid valve (12) are respectively connected to a first freezing room (13), a second freezing room (14), a third freezing room (15) and a fourth freezing room (16) provided inside the cold storage system; and a conveying pipeline (17) is inserted between the first freezing room (13), the second freezing room (14), the third freezing room (15) and the fourth freezing room (16); The conveying pipeline (17) comprises a temperature compensation pipeline (1701), a conveying cylinder (1702) is fixedly installed at the bottom of the temperature compensation pipeline (1701), a leakage net (1703) is fixedly installed at the bottom of the conveying cylinder (1702), sealing plates (1704) are movably installed inside the temperature compensation pipeline (1701) and on the left and right sides of the conveying cylinder (1702), temperature sensors (1705) are fixedly installed at the top and bottom of the temperature compensation pipeline (1701), rotating shafts (1706) are fixedly installed on the left and right sides of the sealing plate (1704), a driving motor (1707) is fixedly installed inside the temperature compensation pipeline (1701), and a transmission wheel (1708) is fixedly installed at the output end of the driving motor (1707).

2. According to claim 1, an off-grid distributed solar photovoltaic power generation and energy storage cold storage is characterized by: The MPPT controller (2) directly supplies a portion of the electric energy generated by the photovoltaic module (1) to the energy storage battery (3), and converts the other portion of the electric energy into alternating current through an inverter (4) to supply the cold storage system.

3. According to claim 1, an off-grid distributed solar photovoltaic power generation and energy storage cold storage is characterized by: The energy storage system consists of a bidirectional DC / DC converter and a battery. The bidirectional DC / DC converter is connected in parallel to the DC bus of the inverter (4) to control the charging and discharging of the battery.

4. According to claim 1, an off-grid distributed solar photovoltaic power generation and energy storage cold storage is characterized by: The compressor (5), evaporator (6), throttle valve (7) and condenser (8) are used for refrigeration by means of alternating current. The evaporator (6) absorbs heat from the cold storage room to provide refrigeration capacity. The condenser (8) is located outdoors to discharge heat from the cold storage room.

5. According to claim 1, an off-grid distributed solar photovoltaic power generation and energy storage cold storage is characterized by: The two ends of the temperature compensation pipe (1701) pass through the first freezer (13), the second freezer (14), the third freezer (15) and the fourth freezer (16) in sequence, and the conveying cylinder (1702) is respectively located inside the first freezer (13), the second freezer (14), the third freezer (15) and the fourth freezer (16).

6. The off-grid distributed solar photovoltaic power generation and energy storage cold storage according to claim 1, characterized in that: The sealing plate (1704) is arranged at an angle, and the outer surface of the sealing plate (1704) is tightly fitted to the inner wall of the temperature compensation pipe (1701).

7. The off-grid distributed solar photovoltaic power generation and energy storage cold storage according to claim 1, characterized in that: The temperature sensors (1705) are located on the left and right sides of the sealing plate (1704) and are arranged in an up-and-down staggered manner.

8. The off-grid distributed solar photovoltaic power generation and energy storage cold storage according to claim 1, characterized in that: The left and right sides of the inner wall of the temperature compensation pipe (1701) are provided with installation grooves, and the rotating shaft (1706) is rotatably installed inside the installation grooves.

9. The off-grid distributed solar photovoltaic power generation and energy storage cold storage according to claim 1, characterized in that: The driving motor (1707) is fixedly installed on the left side of the temperature compensation pipe (1701), and the driving motor (1707) is located below the rotating shaft (1706), and the transmission wheel (1708) and the rotating shaft (1706) are meshed with each other.

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