Light storage heat flexible efficient energy utilization system and refrigeration equipment

Abstract

The invention discloses a light-storage heat-flexible efficient energy utilization system and refrigeration equipment. The light-storage heat-flexible efficient energy utilization system comprises a heat pump air-conditioning system and a photovoltaic system used for supplying power to the heat pump air-conditioning system. The heat pump air conditioning system is at least provided with a heat energy storage module and a cold energy storage module, and the heat energy storage module can store heat in a refrigerant in a heat storage mode and release the heat in the refrigerant in a defrosting mode to defrost a photovoltaic photo-thermal assembly in the photovoltaic system; the cold energy storage module can store cold energy in a refrigerant in a low-temperature environment and refrigerate a photovoltaic photo-thermal assembly in a photovoltaic system by using the cold energy in a high-temperature environment. Compared with the prior art, the system is provided with two systems, namely a photovoltaic system for supplying power by reasonably calling each module to ensure the maximum utilization of energy efficiency, and a heat pump air-conditioning system which is provided with a heat energy storage module and a cold energy storage module to reasonably utilize heat and cold in a refrigerant to improve the energy utilization rate; the two systems complement each other and are used for improving efficiency and increasing economic benefits of customers.

Description

Technical Field

[0001] The present invention relates to the field of refrigeration, and in particular to a light-storage-heat-flexible-high-efficiency energy utilization system and refrigeration equipment. Background Art

[0002] Photovoltaic power generation has the significant disadvantage of large fluctuations over time and seasons during use, and can hardly respond to the dynamic needs of users, resulting in waste of surplus energy and a poor experience caused by failure to respond to user needs.

[0003] During the operation of traditional heat pump air conditioners, the compressor driven by the energy supplied by the mains needs to be converted into DC by the main control board and then into AC suitable for the compressor. There is an "AC-DC-AC" energy conversion process. If photovoltaic power generation is considered to be connected to the grid through an inverter and then power the heat pump air conditioner compressor, there is a "DC-AC-DC-AC" energy conversion process. The implementation of this process greatly increases the energy loss rate.

[0004] The key issues that need to be solved during the use of photovoltaic power generation: In theory, the better the sunshine conditions, the stronger the sunlight, the more irradiation energy invested in the photovoltaic panels, and the more electricity the photovoltaic panels can generate. However, there is an unfavorable phenomenon that the power generation efficiency of photovoltaic panels decreases significantly as their own temperature rises. The better the sunshine conditions, the more the working temperature of the photovoltaic modules will increase significantly, thereby greatly reducing their power generation efficiency. However, if the waste heat generated by light during the operation of photovoltaics is removed in time, it can not only maintain the good working temperature of the photovoltaic modules, but also increase the heat output without increasing the photovoltaic area, achieving the purpose of killing two birds with one stone.

[0005] CN104113078B discloses a photovoltaic direct drive system and a control method thereof, wherein the method comprises the following steps: according to the energy balance relationship between the photovoltaic unit, the load unit and the grid unit in the photovoltaic direct drive system, a voltage outer loop current inner loop control method is adopted to control the grid-side converter of the grid unit; according to the mathematical model of the load in the load unit in the synchronous rotating coordinate system, a model reference adaptive control method is adopted to control the load operation; according to the dynamic load tracking MPPT adaptive step length control method, the photovoltaic unit is controlled. It adopts different control methods to control the photovoltaic unit, the load unit and the grid unit in the photovoltaic direct drive system respectively, realizes the three-way linkage control in the photovoltaic direct drive system, thereby realizing the two-way flow of energy and real-time grid connection, and effectively solves the problem that the existing photovoltaic air conditioning system cannot realize real-time grid connection and cannot realize full DC grid connection technology.

[0006] CN113028480A discloses a solar photovoltaic heat pump microgrid system, including a photovoltaic module, a passive solar house formed by installing the photovoltaic module with a seal according to a preset angle, and an energy storage battery, an energy storage inverter, a control cabinet and an air source heat pump connected in sequence in the passive solar house. The air source heat pump is connected to a heat exchanger through a circulation pipeline to form a closed loop, the heat exchanger is connected to a hot water storage tank, and the photovoltaic module is connected to the energy storage inverter. The air source heat pump absorbs the heat energy generated by the photovoltaic module when it is working and the heat energy received by the passive solar house, and stores it in the hot water storage tank, thereby reducing the temperature in the passive solar house and greatly improving the comprehensive utilization rate of solar energy.

[0007] CN118089194A proposes a control method for a photovoltaic direct-drive air conditioner and lighting system, including a photovoltaic direct-drive system, wherein the photovoltaic direct-drive system includes a photovoltaic unit, a user unit, a power grid unit and a control system, wherein the user unit includes an air-conditioning system and a lighting system, and the control system is connected with the photovoltaic unit, the load unit and the power grid unit to realize control. The present invention combines the air-conditioning system, the lighting system, the photovoltaic unit and the power grid unit to form a photovoltaic direct-drive system, which is uniformly controlled by a through-hole control system. Through the control of the control system, the power consumption of the air-conditioning system and the lighting system is matched with the power generation power of the photovoltaic unit in real time, thereby effectively improving the utilization rate of the power generated by solar power generation and reducing the energy consumption of the building.

[0008] CN204612240U provides a heat pump type photovoltaic thermal composite device, belonging to the field of solar photovoltaic thermal technology, and its structure includes a photovoltaic panel, a compressor, the backlight surface of the photovoltaic panel directly or indirectly transfers heat to the evaporator, the photovoltaic panel outputs direct current to connect the photovoltaic heat pump driver, the photovoltaic heat pump driver drives the compressor to work, the circulation pipeline sequentially connects the compressor, the water-cooled condenser, the throttle, and the evaporator, the compressor, the water-cooled condenser, the throttle, and the evaporator are connected through the circulation pipeline to form a gas-liquid heat circulation mechanism, the circulation pipeline is connected to the water-cooled condenser pipe side, the water inlet pipeline is connected to the water-cooled condenser shell side, and the water-cooled condenser shell side is connected to the water outlet pipeline. The heat pump type photovoltaic thermal composite device is a heat pump type photovoltaic thermal composite system that uses the direct current of the photovoltaic itself to drive the heat pump to reduce the temperature of the component itself to output heat energy and improve the photoelectric conversion efficiency.

[0009] From the above introduction, it can be seen that although photovoltaic systems and heat pump air conditioners have good benefits in their respective fields, there is still a large amount of energy waste for a single photovoltaic system or heat pump air conditioner. Therefore, how to design a composite photovoltaic system and a heat pump air conditioning system with a light storage, heat flexibility and high-efficiency energy utilization system and refrigeration equipment to improve energy utilization efficiency is a technical problem that needs to be solved urgently in the industry. Summary of the invention

[0010] In view of the problem of low energy utilization efficiency in the prior art, the present invention proposes a light-storage-heat-flexible-high-efficiency energy utilization system and refrigeration equipment.

[0011] The technical solution of the present invention is to propose a light-storage heat-flexible and efficient energy utilization system, including a heat pump air-conditioning system and a photovoltaic system for powering the heat pump air-conditioning system;

[0012] The heat pump air conditioning system has at least a hot energy storage module and a cold energy storage module, wherein the hot energy storage module can store heat in the refrigerant in a heat storage mode and release the heat in the refrigerant in a defrosting mode to defrost the photovoltaic thermal components in the photovoltaic system;

[0013] The cold energy storage module can store cold energy in the refrigerant in a low-temperature environment, and use the cold energy to cool the photovoltaic thermal components in the photovoltaic system in a high-temperature environment.

[0014] Further, the heat pump air conditioning system has an energy storage heat input mode;

[0015] When the heat pump air conditioning system operates in the energy storage heat input mode, the heat pump air conditioning system adjusts the direction of the refrigerant in the following order: compressor, four-way valve, indoor heat exchanger, thermal energy storage unit, throttling device, photovoltaic thermal component, four-way valve, gas-liquid separator, compressor;

[0016] In the energy storage heat input mode, the thermal energy storage module stores heat in the refrigerant.

[0017] Furthermore, the heat pump air conditioning system has an energy storage heat output mode;

[0018] When the heat pump air conditioning system operates in the energy storage heat output mode, the heat pump air conditioning system adjusts the direction of the refrigerant in the following order: compressor, four-way valve, photovoltaic thermal component, throttling device, thermal energy storage unit, indoor heat exchanger, four-way valve, gas-liquid separator, compressor;

[0019] In the energy storage heat output mode, the thermal energy storage module releases the heat in the refrigerant to defrost the photovoltaic thermal components in the photovoltaic system.

[0020] Furthermore, the heat pump air conditioning system has an energy storage cold input mode;

[0021] When the heat pump air conditioning system operates in the energy storage cold input mode, the heat pump air conditioning system adjusts the direction of the refrigerant in the following order: compressor, four-way valve, outdoor heat exchanger, throttle valve, cold energy storage unit, photovoltaic thermal component, indoor evaporator, four-way valve, gas-liquid separator, compressor;

[0022] In the energy storage cold input mode, the cold energy storage module stores cold energy in the refrigerant.

[0023] Furthermore, the heat pump air conditioning system has an energy storage cooling output mode;

[0024] When the heat pump air conditioning system operates in the energy storage cold output mode, the heat pump air conditioning system adjusts the direction of the refrigerant in the following order: compressor, four-way valve, outdoor heat exchanger, cold energy storage unit, throttle valve, photovoltaic thermal component, indoor evaporator, four-way valve, gas-liquid separator, compressor;

[0025] In the energy storage cold input mode, the cold energy storage module uses cold energy to cool the photovoltaic thermal components in the photovoltaic system.

[0026] Furthermore, the photovoltaic system comprises a multi-element commutation module, a photovoltaic module for providing electric energy input to the multi-element commutation module, an electrochemical energy storage module, and a power grid module;

[0027] The photovoltaic system adjusts the power supply status of the photovoltaic module, the electrochemical energy storage module, and the grid module to the multi-element commutation module according to the local irradiance received by the photovoltaic module, the real-time electricity price and the decision-making electricity price of the grid module.

[0028] Furthermore, when the local irradiance is less than a threshold irradiance, the photovoltaic system controls the photovoltaic module to provide electric energy to the multi-element commutation module, and at the same time, an electrochemical energy storage module or a power grid module is set according to the real-time electricity price and the decision-making electricity price to assist the photovoltaic module in providing electric energy;

[0029] When the local irradiance is equal to the threshold irradiance, the photovoltaic system controls the photovoltaic module to provide electric energy to the multi-element inverter module alone;

[0030] When the local irradiance is greater than the threshold irradiance, the photovoltaic system controls the photovoltaic module to provide electric energy to the multi-element commutation module, and at the same time, according to the real-time electricity price and the decision-making electricity price, the photovoltaic module is set to provide surplus electric energy to the electrochemical energy storage module or the grid module;

[0031] When the local irradiance is zero and the real-time electricity price is greater than the decision-making electricity price, the photovoltaic system controls the electrochemical energy storage module to provide electric energy to the multi-element commutation module alone;

[0032] When the local irradiance is zero and the real-time electricity price is less than the decision-making electricity price, the photovoltaic system controls the power grid module to provide electric energy to the multi-element commutation module alone.

[0033] Further, when the local irradiance is less than a threshold irradiance and the real-time electricity price is greater than a decision-making electricity price, the photovoltaic system controls the electrochemical energy storage module to assist the photovoltaic module in providing electrical energy;

[0034] When the local irradiance is less than a threshold irradiance, and the real-time electricity price is less than the decision-making electricity price, the photovoltaic system controls the grid module to assist the photovoltaic module in providing electrical energy;

[0035] When the local irradiance is greater than a threshold irradiance and the real-time electricity price is greater than the decision-making electricity price, the photovoltaic system controls the photovoltaic module to provide surplus electric energy to the grid module;

[0036] When the local irradiance is greater than a threshold irradiance and the real-time electricity price is less than a decision-making electricity price, the photovoltaic system controls the photovoltaic module to provide surplus electric energy to the electrochemical energy storage module.

[0037] Furthermore, a plurality of switching switches are provided in the photovoltaic system, and the switching switches can adjust the power supply state of the photovoltaic module, the electrochemical energy storage module, and the power grid module for the multi-element commutation module;

[0038] The switching switch includes an eleventh switch connected between the photovoltaic module and the electrochemical energy storage module, a twelfth switch connected between the photovoltaic module and the power grid module, a thirteenth switch connected between the electrochemical energy storage module and the multi-element commutation module, and a fourteenth switch connected between the power grid module and the multi-element commutation module.

[0039] The present invention also proposes a refrigeration device having the above-mentioned light-storage-heat-flexible-and-high-efficiency energy utilization system.

[0040] Compared with the prior art, the present invention has at least the following beneficial effects:

[0041] The present invention has two systems, namely a photovoltaic system and a heat pump air conditioning system. The photovoltaic system has a photovoltaic module, an electrochemical energy storage module, and a power grid module, and by calling the power supply of the photovoltaic module, the electrochemical energy storage module, and the power grid module, the energy utilization efficiency is fully guaranteed to be maximized;

[0042] The heat pump air conditioning system has a thermal energy storage module and a cold energy storage module. The thermal energy storage module can reasonably utilize the heat in the refrigerant to avoid adverse working conditions such as the indoor heat exchanger blowing cold air during the defrosting process of the heat pump air conditioning system, which affects the user experience. At the same time, it can also avoid the adverse effects of frost on the surface of photovoltaic thermal components on power generation efficiency and improve the total energy output. The cold energy storage module can reasonably utilize the coldness in the refrigerant, thereby solving the problem that the condenser cannot cool the refrigerant to the target temperature in a high temperature environment, reducing the inlet temperature of the compressor in a high temperature environment, and avoiding the problems of unreliable compressor operation and low operating efficiency caused by excessively high compressor inlet temperature, thereby improving the operating efficiency of the heat pump air conditioning system and improving energy utilization. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0044] Figure 1 This is a schematic diagram of the structure of the light-storage-heat-flexible-high-efficiency energy utilization system proposed in the present invention;

[0045] Figure 2 It is a structural schematic diagram of the heat pump air conditioning system in the present invention;

[0046] Figure 3 It is a working mode control logic diagram of the photovoltaic system in the present invention;

[0047] Figure 4 A schematic diagram of the refrigerant flow in the heat pump air conditioning system of the present invention in the energy storage heat input mode;

[0048] Figure 5 A schematic diagram of the flow of refrigerant in the heat pump air conditioning system of the present invention in the energy storage heat output mode;

[0049] Figure 6 It is a schematic diagram of the refrigerant flow of the heat pump air conditioning system in the energy storage cold input mode of the present invention;

[0050] Figure 7 It is a schematic diagram of the refrigerant flow in the heat pump air conditioning system of the present invention in the energy storage cooling output mode;

[0051] Among them, 11 is a photovoltaic module, 12 is an electrochemical energy storage module, 13 is a power grid module, 14 is a photovoltaic direct drive module, 15 is a multi-element commutation module, 16 is a heat pump air conditioner, 17 is a cold energy storage module, 18 is a thermal energy storage module, 21 is an indoor heat exchanger, 22 is a gas-liquid separator, 23 is a four-way valve, 24 is a compressor, 25 is a photovoltaic thermal component, 26 is an outdoor heat exchanger, 27 is a cold energy storage unit, 28 is a thermal energy storage unit, and 29 is a throttling device;

[0052] K11 is the eleventh switch, K12 is the twelfth switch, K13 is the thirteenth switch, K14 is the fourteenth switch, K21 is the twenty-first switch, K22 is the twenty-second switch, K23 is the twenty-third switch, K24 is the twenty-fourth switch, K25 is the twenty-fifth switch, K26 is the twenty-sixth switch, K27 is the twenty-seventh switch, K28 is the twenty-eighth switch, K29 is the twenty-ninth switch, K210 is the two-hundred-first switch, K211 is the two-hundred-eleventh switch, and K212 is the two-hundred-twelfth switch. DETAILED DESCRIPTION

[0053] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0054] Thus, a feature indicated in this specification will be used to illustrate one of the features of an embodiment of the present invention, rather than implying that each embodiment of the present invention must have the described feature. In addition, it should be noted that this specification describes many features. Although some features can be combined together to illustrate possible system designs, these features can also be used in other combinations that are not explicitly described. Thus, unless otherwise stated, the described combinations are not intended to be limiting.

[0055] The principle and structure of the present invention are described in detail below with reference to the accompanying drawings and embodiments.

[0056] See also Figure 1 , in view of the low energy utilization efficiency in the prior art, the present invention proposes a light storage heat flexible and efficient energy utilization system, including a photovoltaic system and a heat pump air conditioning system;

[0057] The photovoltaic system is composed of a photovoltaic module 11 and a multi-element commutation module 15 equipped with at least one of an electrochemical energy storage module 12, a power grid module 13, and a photovoltaic direct drive module 14;

[0058] The heat pump air conditioning system is composed of a heat pump air conditioning 16 equipped with cold energy storage 17, or a heat pump air conditioning 16 equipped with hot energy storage 18, or a heat pump air conditioning 16 equipped with both cold energy storage 17 and hot energy storage 18;

[0059] The photovoltaic system fully ensures the maximum energy utilization efficiency by calling the power supply of the photovoltaic module 11, the electrochemical energy storage module 12, and the power grid module 13;

[0060] The thermal energy storage 18 in the heat pump air conditioning system can reasonably utilize the heat in the refrigerant, avoiding adverse working conditions that affect the user experience, such as the indoor heat exchanger blowing cold air during the defrosting process of the heat pump air conditioning system. At the same time, it can also avoid the adverse effects of frost on the surface of the photovoltaic thermal 25 module on the power generation efficiency, thereby increasing the total energy output;

[0061] The cold energy storage 17 can reasonably utilize the cold capacity in the refrigerant, thereby solving the problem that the condenser cannot cool the refrigerant to the target temperature in a high temperature environment, reducing the inlet temperature of the compressor in a high temperature environment, and avoiding the unreliable operation of the compressor and the low operation efficiency caused by the excessively high inlet temperature of the compressor. At the same time, the cold capacity of the refrigerant can also be used to cool the photovoltaic thermal component 25, avoiding the problem that the power generation efficiency of the photovoltaic thermal component is reduced due to the increase in temperature in summer, thereby improving energy utilization.

[0062] Among them, the heat pump air conditioning system has an energy storage heat input mode, see Figure 4 When the heat pump air conditioning system operates in the energy storage heat input mode, the heat pump air conditioning system adjusts the direction of the refrigerant in the following order: compressor 24, four-way valve 23, indoor heat exchanger 21, thermal energy storage unit 28, throttling device 29, photovoltaic thermal component 25, four-way valve 23, gas-liquid separator 22, compressor 24;

[0063] The above refrigerant direction is achieved by adjusting the switches. At this time, the twenty-second switch K22, the twenty-sixth switch K26, and the twenty-seventh switch K27 are turned on, and all other switches are turned off.

[0064] It can be seen from the above refrigerant flow direction that when the ambient temperature is below 0°C and in heating mode, the high-pressure refrigerant at the outlet of the indoor heat exchanger 21 will flow through the thermal energy storage unit 28 (corresponding to the thermal energy storage 18). At this time, the thermal energy storage unit 28 can exchange heat with the refrigerant, thereby storing heat in the refrigerant;

[0065] Furthermore, the heat pump air conditioning system has an energy storage heat output mode, see Figure 5 When the heat pump air conditioning system operates in the energy storage heat output mode, the heat pump air conditioning system adjusts the direction of the refrigerant as follows:

[0066] Compressor 24 , four-way valve 23 , photovoltaic thermal assembly 25 , throttling device 29 , thermal energy storage unit 28 , indoor heat exchanger 21 , four-way valve 23 , gas-liquid separator 22 , compressor 24 .

[0067] At this time, the corresponding regulating switches are: the 22nd switch K22, the 26th switch K26, and the 27th switch K27 are turned on, and all other switches are turned off. After switching, the heat pump air conditioner 16 enters the heat pump heat storage operation mode. Compared with before, the direction of the four-way valve 23 has changed.

[0068] It can be seen from the flow direction of the above-mentioned refrigerant that when frost is detected on the surface of the direct expansion photovoltaic thermal assembly 25, the heat pump air-conditioning system enters the heat pump defrost mode. At this time, the refrigerant flows through the thermal energy storage unit 28. The thermal energy storage unit 28 can exchange heat when the refrigerant flows through, thereby providing heat for heating the refrigerant, thereby avoiding significantly lowering the indoor ambient temperature.

[0069] The above-mentioned energy storage heat input mode and energy storage heat output mode can achieve the above-mentioned effects: the thermal energy storage 18 can reasonably utilize the heat in the refrigerant, avoid adverse conditions that affect the user experience such as the indoor heat exchanger blowing cold air during the defrosting process of the heat pump air-conditioning system, and at the same time avoid the adverse effects of frost on the surface of the photovoltaic thermal components on the power generation efficiency, thereby increasing the total energy output.

[0070] Furthermore, the heat pump air conditioning system has an energy storage cold input mode. When the heat pump air conditioning system operates in the energy storage cold input mode, the heat pump air conditioning system adjusts the direction of the refrigerant in the following order: compressor 24, four-way valve 23, outdoor heat exchanger 26, throttle valve 29, cold energy storage unit 27, photovoltaic thermal component 25, indoor evaporator (not shown in the figure), four-way valve 23, gas-liquid separator 22, compressor 24;

[0071] At this time, the corresponding regulating switches are: the 21st switch K21, the 23rd switch K23, the 24th switch K24, the 25th switch K25, the 26th switch K28, the 29th switch K29, the 211th switch K211, and the 212th switch K212 are turned on, and the other switches are turned off;

[0072] It can be seen from the above refrigerant flow direction that when the ambient temperature is greater than 20°C and less than 35°C and the heat pump air conditioning system is in a cooling condition, the refrigerant will flow through the cold energy storage unit 27, and the cold energy storage unit 27 can store cold energy;

[0073] Further, the heat pump air conditioning system has an energy storage cold output mode. When the heat pump air conditioning system operates in the energy storage cold output mode, the compressor 24, the four-way valve 23, the outdoor heat exchanger 26, the cold energy storage unit 27, the throttle valve 29, the photovoltaic thermal component 25, the indoor evaporator (not shown in the figure), the four-way valve 23, the gas-liquid separator 22, and the compressor 24;

[0074] At this time, the corresponding regulating switches are: the twenty-first switch K21, the twenty-second switch K22, the twenty-fifth switch K25, the twenty-sixth switch K28, the twenty-ninth switch K29, the twenty-hundredth switch K210, and the twenty-twelfth switch K212 are turned on, and the remaining switches are turned off;

[0075] It can be seen from the flow direction of the above refrigerant that when the ambient temperature is greater than 35°C, the refrigerant will flow through the cold energy storage unit 27. At this time, the refrigerant will exchange heat with the cold energy storage unit 27, thereby reducing the refrigerant temperature. The cold energy in the cold energy storage unit 27 is used to cool the refrigerant, thereby improving the cooling effect.

[0076] The above energy storage cold input mode and energy storage cold output mode can achieve the above effects:

[0077] The cold energy storage 17 can reasonably utilize the cold capacity in the refrigerant, thereby solving the problem that the condenser cannot cool the refrigerant to the target temperature in a high temperature environment, reducing the inlet temperature of the compressor in a high temperature environment, and avoiding the unreliable operation of the compressor and the low operation efficiency caused by the excessively high inlet temperature of the compressor. At the same time, the cold capacity of the refrigerant can also be used to cool the photovoltaic thermal component 25, avoiding the problem that the power generation efficiency of the photovoltaic thermal component is reduced due to the increase in temperature in summer, thereby improving energy utilization.

[0078] See also Figure 3 In the present invention, the photovoltaic system distributes the power supply status of the photovoltaic module 11, the electrochemical energy storage module 12, and the power grid module 13 based on the local irradiance received by the photovoltaic module, and the real-time electricity price and decision-making electricity price of the power grid module (here the real-time electricity price and decision-making electricity price are also electricity price parameters). It is mainly divided into five working modes, namely:

[0079] When the local irradiance is less than the threshold irradiance, it is the first working mode, at which the photovoltaic system controls the photovoltaic module 11 to provide power to the multi-element commutation module 15, and at the same time sets the electrochemical energy storage module 12 or the grid module 13 to assist the photovoltaic module 11 in providing power according to the real-time electricity price and the decision-making electricity price;

[0080] When the local irradiance is equal to the threshold irradiance, it is the second working mode, at which time the photovoltaic system controls the photovoltaic module 11 to provide power to the multi-element commutation module 15 alone;

[0081] When the local irradiance is greater than the threshold irradiance, it is the third working mode, at this time, the photovoltaic system controls the photovoltaic module 11 to provide power to the multi-element commutation module 15, and at the same time, according to the real-time electricity price and the decision-making electricity price, the photovoltaic module 11 provides the surplus power to the electrochemical energy storage module 12 or the grid module 13;

[0082] When the local irradiance is zero and the real-time electricity price is greater than the decision-making electricity price, it is the fourth working mode, at which the photovoltaic system controls the electrochemical energy storage module 12 to provide power to the multi-element commutation module 15 alone;

[0083] When the local irradiance is zero and the real-time electricity price is less than the decision-making electricity price, it is the fifth working mode. At this time, the photovoltaic system controls the grid module 13 to provide power to the multi-element commutation module 15 alone.

[0084] Among them, the first working mode is a working condition in which the local illuminance of the photovoltaic module 11 is low during the day. Under this working condition, the power generation of the photovoltaic module 11 itself is insufficient to supply power to the load module. At this time, the electrochemical energy storage module 12 or the power grid module 13 is required to assist in power supply. The specific module to assist in power supply is determined according to the electricity price parameter. If the current real-time electricity price is high, the electrochemical energy storage module 12 can be used to assist in power supply. Otherwise, the power grid module 13 can be used to assist in power supply.

[0085] That is, in the first mode, when the local irradiance is less than the threshold irradiance and the real-time electricity price is greater than the decision-making electricity price, the photovoltaic system controls the electrochemical energy storage module 12 to assist the photovoltaic module 11 in providing electrical energy;

[0086] When the local irradiance is less than the threshold irradiance, and the real-time electricity price is less than the decision-making electricity price, the photovoltaic system controls the grid module 13 to assist the photovoltaic module 11 in providing electrical energy;

[0087] The second working mode is during the daytime, and the local illuminance of the photovoltaic module 11 is medium. Under this working condition, the power generation of the photovoltaic module 11 is just enough to supply power to the load module. At this time, the electrochemical energy storage module 12 or the grid module 13 is not needed to assist in power supply. The photovoltaic module 11 supplies power to the load module alone through the multi-element commutation module 15.

[0088] The third working mode is during the daytime, and the local illuminance of the photovoltaic module 11 is relatively high. Under this working condition, the power generation of the photovoltaic module 11 is relatively high, which can not only supply power to the load module, but also have surplus power generation. In order to avoid wasting the surplus power generation, the surplus power generation of the photovoltaic module 11 is used to supply power to the electrochemical energy storage module 12 or the power grid module 13. Whether to supply power to the electrochemical energy storage module 12 or the power grid module 13 is determined by the electricity price parameter. If the current real-time electricity price is high, supplying power to the power grid module 13 can obtain higher economic benefits, otherwise, the electrochemical energy storage module 12 is supplied.

[0089] That is, in the third working mode, when the local irradiance is greater than the threshold irradiance and the real-time electricity price is greater than the decision-making electricity price, the photovoltaic system controls the photovoltaic module 11 to provide the surplus electric energy to the grid module 13;

[0090] When the local irradiance is greater than the threshold irradiance and the real-time electricity price is less than the decision-making electricity price, the photovoltaic system controls the photovoltaic module 11 to provide surplus electric energy to the electrochemical energy storage module 12 .

[0091] The fourth working mode and the fifth working mode are both at night. At this time, the photovoltaic module 11 cannot generate electricity and can only be powered by the electrochemical module 12 or the power grid module 13. Whether the electrochemical module 12 or the power grid module 13 is used for power supply is determined by the electricity price parameters. If the current real-time electricity price is high, using the power grid module 13 for power supply will bring higher costs. At this time, the electrochemical module 12 is used for power supply, otherwise the power grid module 13 is used for power supply.

[0092] It should be noted that the threshold illuminance here may not be a specific value, but may also be a value range, within which the power generation of the photovoltaic module 11 can just supply power to the load module.

[0093] See also Figure 3 , which is a working mode control logic diagram of the light-storage-heat-flexible-high-efficiency energy utilization system in the present invention, Figure 3 a represents the local irradiance, P represents the real-time electricity price, a1 represents the threshold irradiance, and G represents the decision-making electricity price;

[0094] In the present invention, after obtaining the local irradiance a and the real-time electricity price P, the judgment of a=0 is first entered, which is used to determine whether the current environment is daytime or nighttime. If a=0, it means that the current environment is nighttime, and if a>0, it means that the current environment is daytime (because the illumination will not be negative, so there is no a<0 situation);

[0095] During the day, the photovoltaic module 11 can generate electricity and participate in power supply. At this time, it is necessary to determine whether the power generation of the photovoltaic module 11 is surplus or insufficient based on the local irradiance a and the threshold irradiance a1;

[0096] When the local illuminance a is less than the threshold illuminance a1, the power generation of the photovoltaic module 11 itself is insufficient to supply power to the load module. At this time, the electrochemical energy storage module 12 or the grid module 13 is required to assist in power supply and enter the first working mode, that is, the attached Figure 3 Working condition 1 in

[0097] When the local illuminance a is equal to the threshold illuminance a1, the power generation of the photovoltaic module 11 is just enough to supply power to the load module. At this time, the electrochemical energy storage module 12 or the grid module 13 is not needed to assist in power supply, and the second working mode is entered, that is, the attached Figure 3 Working condition 2 in the

[0098] When the local illuminance a is greater than the threshold illuminance a1, the power generation of the photovoltaic module 11 is relatively high under this condition, which can not only supply power to the load module, but also have surplus power generation, and enter the third working mode, that is, the attached Figure 3 Working condition 3 in the

[0099] At night, the photovoltaic module 11 cannot provide power. At this time, it is necessary to determine whether the electrochemical energy storage module 12 or the grid module 13 is responsible for power supply according to the real-time electricity price P.

[0100] When the real-time electricity price P is greater than the decision-making electricity price G, the cost of using the power grid module 13 to supply power is high, and the electrochemical energy storage module 12 is required to supply power. At this time, the fourth working mode is entered, that is, the attached Figure 3 Working condition 4 in;

[0101] On the contrary, when the real-time electricity price P is less than the decision electricity price G, the cost of using the power grid module 13 to supply power is low, and the fifth working mode is entered, that is, the attached Figure 3 Working condition 5.

[0102] See also Figure 1 The connection method of the light-storage-heat-flexible-high-efficiency energy utilization system proposed in the present invention is:

[0103] The output side of the photovoltaic module 11 is respectively connected to the input side of the multi-element commutation module 15, the input side of the electrochemical energy storage module 12, and the input side of the grid module 13, and a photovoltaic direct drive module 14 is connected between the output side of the photovoltaic module 11 and the input side of the multi-element commutation module 15;

[0104] An eleventh switch K11 is connected between the output side of the photovoltaic module 11 and the input side of the electrochemical energy storage module 12, and a twelfth switch K12 is connected between the output side of the photovoltaic module 11 and the input side of the power grid module 13;

[0105] The output side of the electrochemical energy storage module 12 is connected to the input side of the multi-element inverter module 15, and a thirteenth switch K13 is connected between the output side of the electrochemical energy storage module 12 and the input side of the multi-element inverter module 15;

[0106] The output side of the grid module 13 is connected to the input side of the multiplex converter module 15 , and a fourteenth switch K14 is connected between the output side of the grid module 13 and the input side of the multiplex converter module 15 .

[0107] The switching among the above five working modes is performed through the above eleventh switch K11, the twelfth switch K12, the thirteenth switch K14, and the fifteenth switch K15, where the eleventh switch K11, the twelfth switch K12, the thirteenth switch K14, and the fifteenth switch K15 are also the switching switches mentioned above. The specific switching logic is:

[0108] When the solar-storage-heat-flexible-high-efficiency-energy-utilization system operates in the first operating mode, the solar-storage-heat-flexible-high-efficiency-energy-utilization system controls the thirteenth switch K13 or the fourteenth switch K14 to close according to the electricity price parameter;

[0109] When the solar-storage-heat-flexible-efficient-energy-utilization system operates in the second operating mode, the solar-storage-heat-flexible-efficient-energy-utilization system controls the eleventh switch K11, the twelfth switch K12, the thirteenth switch K13, and the fourteenth switch K14 to be closed;

[0110] When the solar-storage-heat-flexible-efficient-energy-utilization system operates in the third operating mode, the solar-storage-heat-flexible-efficient-energy-utilization system controls the eleventh switch K11 or the twelfth switch K12 to close according to the electricity price parameter;

[0111] When the solar-storage-heat-flexible-high-efficiency-energy-utilization system operates in the fourth operating mode, the solar-storage-heat-flexible-high-efficiency-energy-utilization system controls the thirteenth switch K13 to be closed according to the electricity price parameter;

[0112] When the photovoltaic, heat storage, flexible and efficient energy utilization system operates in the fifth operation mode, the photovoltaic, heat storage, flexible and efficient energy utilization system controls the fourteenth switch K14 to close according to the electricity price parameters.

[0113] Among them, in the first working mode, whether the photovoltaic module 11 is powered by the electrochemical energy storage module 12 or the photovoltaic module 11 is powered by the power grid module 13 is determined by the relationship between the real-time electricity price and the decision electricity price:

[0114] When the real-time electricity price is greater than the decision-making electricity price, the electrochemical energy storage module 12 assists the photovoltaic module 11 in supplying power, and at this time, the thirteenth switch K13 is controlled to be closed;

[0115] When the real-time electricity price is less than the decision-making electricity price, the power grid module 13 assists the photovoltaic module 11 in supplying power, and at this time, the fourteenth switch K14 is controlled to be closed;

[0116] In the third working mode, the photovoltaic module 11 uses the surplus electricity to supply power to the electrochemical energy storage module 12 or the grid module 13. The specific power supply relationship is determined by the relationship between the real-time electricity price and the decision-making electricity price:

[0117] When the real-time electricity price is greater than the decision-making electricity price, the photovoltaic module 11 supplies the grid module 13 with surplus electricity, and at this time the twelfth switch K12 is controlled to be closed;

[0118] When the real-time electricity price is less than the decision-making electricity price, the photovoltaic module 11 uses the surplus electricity to supply power to the electrochemical module 12, and at this time the eleventh switch K11 is controlled to be closed;

[0119] The present invention also proposes a refrigeration device having the above-mentioned light-storage-heat-flexible-and-high-efficiency energy utilization system.

[0120] Compared with the prior art, the present invention has at least the following beneficial effects:

[0121] The present invention has two systems, namely a photovoltaic system and a heat pump air conditioning system, wherein the photovoltaic system has a photovoltaic module, an electrochemical energy storage module, and a power grid module, and by calling the power supply of the photovoltaic module, the electrochemical energy storage module, and the power grid module, the energy utilization efficiency is fully guaranteed to be maximized;

[0122] The heat pump air conditioning system has a thermal energy storage module and a cold energy storage module. The thermal energy storage module can reasonably utilize the heat in the refrigerant to avoid adverse working conditions such as the indoor heat exchanger blowing cold air during the defrosting process of the heat pump air conditioning system, which affects the user experience. At the same time, it can also avoid the adverse effects of frost on the surface of photovoltaic thermal components on power generation efficiency and improve the total energy output. The cold energy storage module can reasonably utilize the coldness in the refrigerant, thereby solving the problem that the condenser cannot cool the refrigerant to the target temperature in a high temperature environment, reducing the inlet temperature of the compressor in a high temperature environment, and avoiding the problems of unreliable compressor operation and low operating efficiency caused by excessively high compressor inlet temperature, thereby improving the operating efficiency of the heat pump air conditioning system and improving energy utilization.

[0123] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A light-storage, heat-storage, flexible and efficient energy utilization system, characterized in that: It includes a heat pump air conditioning system and a photovoltaic system for supplying power to the heat pump air conditioning system; The heat pump air conditioning system has at least a hot energy storage module and a cold energy storage module, wherein the hot energy storage module can store heat in the refrigerant in a heat storage mode and release the heat in the refrigerant in a defrosting mode to defrost the photovoltaic thermal components in the photovoltaic system; The cold energy storage module can store cold energy in the refrigerant in a low-temperature environment, and use the cold energy to cool the photovoltaic thermal components in the photovoltaic system in a high-temperature environment.

2. The light-storage, heat-storage, flexible and efficient energy utilization system according to claim 1 is characterized in that: The heat pump air conditioning system has an energy storage heat input mode; When the heat pump air conditioning system operates in the energy storage heat input mode, the heat pump air conditioning system adjusts the direction of the refrigerant in the following order: compressor, four-way valve, indoor heat exchanger, thermal energy storage unit, throttling device, photovoltaic thermal component, four-way valve, gas-liquid separator, compressor; In the energy storage heat input mode, the thermal energy storage module stores heat in the refrigerant.

3. The light-storage, heat-storage, flexible and efficient energy utilization system according to claim 1 is characterized in that: The heat pump air conditioning system has an energy storage heat output mode; When the heat pump air conditioning system operates in the energy storage heat output mode, the heat pump air conditioning system adjusts the direction of the refrigerant in the following order: compressor, four-way valve, photovoltaic thermal component, throttling device, thermal energy storage unit, indoor heat exchanger, four-way valve, gas-liquid separator, compressor; In the energy storage heat output mode, the thermal energy storage module releases the heat in the refrigerant to defrost the photovoltaic thermal components in the photovoltaic system.

4. The light-storage, heat-storage, flexible and efficient energy utilization system according to claim 1 is characterized in that: The heat pump air conditioning system has an energy storage cold input mode; When the heat pump air conditioning system operates in the energy storage cold input mode, the heat pump air conditioning system adjusts the direction of the refrigerant in the following order: compressor, four-way valve, outdoor heat exchanger, throttle valve, cold energy storage unit, photovoltaic thermal component, indoor evaporator, four-way valve, gas-liquid separator, compressor; In the energy storage cold input mode, the cold energy storage module stores cold energy in the refrigerant.

5. The light-storage, heat-storage, flexible and efficient energy utilization system according to claim 1 is characterized in that: The heat pump air conditioning system has an energy storage cooling output mode; When the heat pump air conditioning system operates in the energy storage cold output mode, the heat pump air conditioning system adjusts the direction of the refrigerant in the following order: compressor, four-way valve, outdoor heat exchanger, cold energy storage unit, throttle valve, photovoltaic thermal component, indoor evaporator, four-way valve, gas-liquid separator, compressor; In the energy storage cold input mode, the cold energy storage module uses cold energy to cool the photovoltaic thermal components in the photovoltaic system.

6. The light-storage, heat-storage, flexible and efficient energy utilization system according to claim 1 is characterized in that: The photovoltaic system comprises a multi-element commutation module, a photovoltaic module for providing electric energy input to the multi-element commutation module, an electrochemical energy storage module, and a power grid module; The photovoltaic system adjusts the power supply status of the photovoltaic module, the electrochemical energy storage module, and the grid module to the multi-element commutation module according to the local irradiance received by the photovoltaic module, the real-time electricity price and the decision-making electricity price of the grid module.

7. The light-storage, heat-storage, flexible and efficient energy utilization system according to claim 6 is characterized in that: When the local irradiance is less than the threshold irradiance, the photovoltaic system controls the photovoltaic module to provide electric energy to the multi-element commutation module, and at the same time sets an electrochemical energy storage module or a power grid module according to the real-time electricity price and the decision-making electricity price to assist the photovoltaic module in providing electric energy; When the local irradiance is equal to the threshold irradiance, the photovoltaic system controls the photovoltaic module to provide electric energy to the multi-element inverter module alone; When the local irradiance is greater than the threshold irradiance, the photovoltaic system controls the photovoltaic module to provide electric energy to the multi-element commutation module, and at the same time, according to the real-time electricity price and the decision-making electricity price, the photovoltaic module is set to provide surplus electric energy to the electrochemical energy storage module or the grid module; When the local irradiance is zero and the real-time electricity price is greater than the decision-making electricity price, the photovoltaic system controls the electrochemical energy storage module to provide electric energy to the multi-element commutation module alone; When the local irradiance is zero and the real-time electricity price is less than the decision-making electricity price, the photovoltaic system controls the power grid module to provide electric energy to the multi-element commutation module alone.

8. The light-storage, heat-storage, flexible and efficient energy utilization system according to claim 7 is characterized in that: When the local irradiance is less than a threshold irradiance and the real-time electricity price is greater than the decision electricity price, the photovoltaic system controls the electrochemical energy storage module to assist the photovoltaic module in providing electrical energy; When the local irradiance is less than a threshold irradiance, and the real-time electricity price is less than the decision-making electricity price, the photovoltaic system controls the grid module to assist the photovoltaic module in providing electrical energy; When the local irradiance is greater than a threshold irradiance and the real-time electricity price is greater than the decision-making electricity price, the photovoltaic system controls the photovoltaic module to provide surplus electric energy to the grid module; When the local irradiance is greater than a threshold irradiance and the real-time electricity price is less than a decision-making electricity price, the photovoltaic system controls the photovoltaic module to provide surplus electric energy to the electrochemical energy storage module.

9. The light-storage, heat-storage, flexible and efficient energy utilization system according to claim 7 is characterized in that: A plurality of switching switches are provided in the photovoltaic system, and the switching switches can adjust the power supply state of the photovoltaic module, the electrochemical energy storage module, and the power grid module for the multi-element commutation module; The switching switch includes an eleventh switch connected between the photovoltaic module and the electrochemical energy storage module, a twelfth switch connected between the photovoltaic module and the power grid module, a thirteenth switch connected between the electrochemical energy storage module and the multi-element commutation module, and a fourteenth switch connected between the power grid module and the multi-element commutation module.

10. A refrigeration device, characterized in that: The refrigeration equipment has the light-storage-heat-flexible-and-high-efficiency energy utilization system as described in any one of claims 1 to 9.

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