Energy collaboration system based on photovoltaic-PN junction dual-mode temperature control and control method

Abstract

The invention discloses an energy collaboration system based on photovoltaic-PN junction dual-mode temperature control and a control method. The energy collaboration system comprises a solar photovoltaic panel, a semiconductor refrigeration unit and a heat dissipation unit which are sequentially connected from top to bottom. The heat dissipation unit comprises a plurality of fin heat dissipation mechanisms arranged in parallel, at least one heat pipe is arranged in each fin heat dissipation mechanism in a penetrating mode, one end of each heat pipe is embedded into the corresponding fin heat dissipation mechanism, the other end of each heat pipe extends out of the corresponding fin heat dissipation mechanism, and one end of each heat pipe is lower than the other end of the corresponding heat pipe. And the other end of the heat pipe is connected into the phase change heat storage unit. Through reasonable arrangement of component structures, electric energy generated by the solar photovoltaic panel is utilized to preferentially drive the semiconductor refrigeration unit to refrigerate, and precise temperature regulation and control of the solar photovoltaic panel are achieved through closed-loop feedback control; through active temperature control, the photoelectric conversion efficiency is improved; the problems of temperature rise efficiency attenuation of the solar photovoltaic panel and energy waste at night are integrally solved, and power generation / refrigeration / heat storage multi-energy cooperation and day and night continuous energy supply are achieved.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of solar energy utilization and thermoelectric conversion, and particularly relates to an energy collaborative system based on photovoltaic-PN junction dual-mode temperature control and a control method. BACKGROUND

[0002] The traditional photovoltaic power generation system faces multiple energy conversion efficiency bottlenecks in actual operation, and the technical limitations mainly manifest in the following three dimensions: 1. Thermal efficiency decay mechanism Crystalline silicon photovoltaic panels have significant temperature sensitivity, and a 1℃ increase in operating temperature will cause a 0.4-0.5% power output decay. When the outdoor irradiance intensity reaches 1000W / m² in summer, the backboard temperature of the component can exceed 75℃, resulting in a theoretical efficiency loss of 15-20%. Traditional passive heat dissipation schemes (aluminum fins / phase change materials) can achieve basic heat management, but have obvious technical defects: the latent heat storage density of phase change materials is limited, the thermal conductivity is low, and there is a lack of dynamic temperature control capability; wind cooling dissipation is subject to environmental wind speed fluctuations and cannot achieve precise temperature control.

[0003] 2. Day-night energy cliff effect Photovoltaic systems are subject to the light cycle, and the night power generation is zero, causing the electric power grid peak shaving pressure to increase dramatically. In existing energy storage solutions, lithium battery energy storage has a cycle life limit (3000-5000 times), capacity attenuation (annual attenuation rate >5%), and safety hazards; pumped storage is subject to geographical conditions, and the energy round-trip efficiency is only 70-85%. This results in the photovoltaic system having an average annual effective operation time of less than 2000 hours, and the energy utilization rate being less than 25%.

[0004] 3. Thermoelectric refrigeration system energy efficiency paradox Conventional semiconductor refrigeration plates (TEC) can achieve active temperature control, but their energy conversion efficiency COP is generally less than 0.6, and they need to be continuously powered externally. When applied to photovoltaic systems, a "power generation-refrigeration" reverse energy cycle is formed: 20-30% of the daytime photovoltaic power generation needs to be fed back to the refrigeration system, and at night, it completely relies on the power grid for power supply. This parasitic power consumption mode seriously weakens the energy autonomy of the renewable energy system, causing the net energy gain of the system to decrease by 40-60%.

[0005] The above technical problems form a negative cycle that strengthens each other: heat accumulation reduces power generation efficiency → insufficient energy storage exacerbates day-night fluctuations → compensatory refrigeration increases system energy consumption. Existing solutions mostly use discrete improvements (such as independent heat dissipation / energy storage modules), and fail to establish an energy closed-loop system that couples light-heat-electricity, resulting in exponential growth in system complexity and cost. This has become a key technical bottleneck restricting the evolution of photovoltaic systems towards high energy density and all-weather operation. SUMMARY

[0006] In order to solve the above problems, the purpose of the present application is to provide a photovoltaic-PN junction dual-mode temperature control based energy collaborative system and control method, which solves the problems of photovoltaic panel temperature rise efficiency decay and night energy waste.

[0007] In order to achieve the above-mentioned purpose, the technical scheme adopted by the present application includes: A photovoltaic-PN junction dual-mode temperature control based energy collaborative system, comprising a solar photovoltaic panel, a semiconductor refrigeration unit and a heat dissipation unit connected in sequence from top to bottom, and the solar photovoltaic panel and the semiconductor refrigeration unit are electrically connected through a bidirectional DC-DC converter; the heat dissipation unit comprises a plurality of fin heat dissipation mechanisms arranged in parallel, at least one heat pipe is arranged in each fin heat dissipation mechanism, one end of the heat pipe is embedded in the fin heat dissipation mechanism, the other end of the heat pipe extends to the outside of the fin heat dissipation mechanism, and the one end of the heat pipe is lower than the other end of the heat pipe; and the other end of the heat pipe is connected into a phase change heat storage unit.

[0008] Preferably, the part of the heat pipe embedded in the fin heat dissipation mechanism is the evaporation section of the heat pipe, and the evaporation section of the heat pipe is parallel and level with the axis of the fin heat dissipation mechanism.

[0009] Preferably, a plurality of heat pipes are arranged in each fin heat dissipation mechanism, and the evaporation sections of the heat pipes are arranged in an array in the fin heat dissipation mechanism.

[0010] Preferably, the phase change heat storage unit comprises a sealed container filled with paraffin / graphite composite material, and a hot water circulation pipeline arranged in the sealed container, the hot water circulation pipeline is connected with a water storage tank or a heating terminal; the other end of the heat pipe is connected into the phase change heat storage unit, and the heat pipe in the sealed container is not in contact with the hot water circulation pipeline.

[0011] Preferably, the other end of the heat pipe is embedded in the sealed container in a serpentine arrangement.

[0012] Preferably, the semiconductor refrigeration unit comprises a plurality of TEC refrigeration pieces arranged in parallel, each TEC refrigeration piece corresponds to each fin heat dissipation mechanism; the TEC cold end of any TEC refrigeration piece is connected with the lower part of the solar photovoltaic panel, and the TEC hot end of any TEC refrigeration piece is connected with the upper part of the fin heat dissipation mechanism.

[0013] Preferably, each TEC refrigeration piece is arranged in an array along the bottom surface of the photovoltaic panel.

[0014] Preferably, it further comprises a tempered glass above the solar photovoltaic panel, the tempered glass completely covers the solar photovoltaic panel, and the tempered glass and the solar photovoltaic panel are connected through the limiting connection of the shell frame.

[0015] Preferably, it further comprises an EVA plate arranged between the tempered glass and the solar photovoltaic panel, and the outer periphery of the EVA plate is sealingly connected with the inner periphery of the shell frame. Preferably, it further comprises an EVA plate arranged between the tempered glass and the solar photovoltaic panel, and the outer periphery of the EVA plate is sealingly connected with the inner periphery of the shell frame.

[0016] A control method of an energy collaborative system based on photovoltaic-PN junction dual-mode temperature control, including strong light high temperature working condition and weak light low temperature working condition; The strong light high temperature working condition is specifically: when the solar photovoltaic panel is greater than 40 DEG C and the illumination is greater than 800 W / m2, the bidirectional DC-DC converter inputs a forward current to the semiconductor refrigeration unit, the semiconductor refrigeration unit refrigerates and the temperature of the hot end thereof gradually rises to 60-80 DEG C, the heat of the hot end of the semiconductor refrigeration unit is conducted to the heat pipe through the fin heat dissipation mechanism, the working medium in the heat pipe evaporates and vaporizes along the heat pipe to the other end, and the heat pipe condenses and releases heat and stores heat in the phase change heat storage unit. The weak light low temperature working condition is specifically: when the ambient temperature is less than 15 DEG C and the output power of the solar photovoltaic panel is less than 30% of the rated value, the semiconductor refrigeration unit is switched to the thermoelectric generation mode to output a reverse current, and an energy storage battery is externally connected to store the current; meanwhile, as the ambient temperature decreases, the heat stored in the phase change heat storage unit starts to release heat.

[0017] Compared with the prior art, the advantages of the present application are: (1) The energy collaborative system based on photovoltaic-PN junction dual-mode temperature control of the present application, through reasonable setting of the component structure, uses the electric energy generated by the solar photovoltaic panel to preferentially drive the semiconductor refrigeration unit to refrigerate, realizes accurate temperature control (target temperature 25-35 DEG C) of the solar photovoltaic panel through closed-loop feedback control, actively controls the temperature, improves the photoelectric conversion efficiency, suppresses the hot spot effect of the solar photovoltaic panel, delays the aging of the component, and prolongs the service life; the problems of solar photovoltaic panel temperature rise efficiency decay and night energy waste are solved, and power generation / refrigeration / heat storage multi-energy collaboration and day and night continuous energy supply are realized.

[0018] (2) The energy collaborative system based on photovoltaic-PN junction dual-mode temperature control of the present application, through reasonable setting of the component structure, preferentially drives the TEC to refrigerate and cool under the condition of strong light and high temperature, and the remaining electric energy is connected to the power grid or stored; under the condition of weak light and low temperature, the TEC is switched to the thermoelectric generation mode, and additional electric energy is generated by using the natural temperature difference between the photovoltaic panel and the environment (through the heat dissipation fin and the air convection of the cold end).

[0019] (3) The energy collaborative system based on photovoltaic-PN junction dual-mode temperature control of the present application, through reasonable setting of the component structure, the TEC hot end is coupled with the fin heat dissipation mechanism, the waste heat is guided to the phase change heat storage unit, and is used for night heating or hot water supply. BRIEF DESCRIPTION OF DRAWINGS

[0020] The accompanying drawings are used to provide a further understanding of the present application, and constitute a part of the specification, and are used to explain the present application together with the specific embodiments below, but do not constitute a limitation on the present application. In the drawings: Figure 1The structural schematic diagram of the energy coordination system based on the photovoltaic-PN junction double-mode temperature control of the application; Figure 2 The structural schematic diagram of the energy coordination system based on the photovoltaic-PN junction double-mode temperature control of the application; Figure 1 The structural schematic diagram of the energy coordination system based on the photovoltaic-PN junction double-mode temperature control of the application; Figure 3 The structural schematic diagram of the energy coordination system based on the photovoltaic-PN junction double-mode temperature control of the application.

[0021] The structural schematic diagram of the energy coordination system based on the photovoltaic-PN junction double-mode temperature control of the application. 1. The shell frame, 2. The tempered glass, 3. The EVA plate, 4. The solar photovoltaic panel, 5. The TEC refrigeration sheet, 5-1 The TEC cold end, 5-2 The TEC hot end, 6. The fin heat dissipation mechanism, 7. The heat pipe. DETAILED DESCRIPTION

[0022] The application is not limited to the following specific embodiments, and any equivalent variations made on the basis of the technical solutions of the application fall within the protection scope of the application.

[0023] It should be noted that the directional terms mentioned herein are consistent with the specific directions on the paper of the drawings or the corresponding directions of the space shown in the drawings; all components and devices in the application, unless otherwise specified, all use the components and devices known in the prior art.

[0024] The heat pipe (or heat guide pipe) disclosed in the application is a special material with the characteristics of rapid temperature equalization. The metal pipe body is empty, which makes it light in weight. The rapid temperature equalization characteristic makes it have excellent thermal superconductivity, and it plays the role of rapid heat conduction, which is the most common and efficient heat conduction element in the heat dissipation device of electronic products today.

[0025] The heat pipe mainly consists of a highly sealed shell, a capillary core attached to the inner wall of the shell, and a liquid working medium flowing inside. The heat pipe has a certain vacuum degree (steam flow is formed during heat absorption and heat conduction), and the inside does not contain air or any other non-condensable gas. One end of the heat pipe is the heat pipe evaporation section, the other end is the heat pipe condensation section, and according to the needs, an adiabatic section can also be provided in the middle. When the heat pipe is working, the heat pipe evaporation section absorbs heat and absorbs heat, and the liquid working medium inside it evaporates into steam. The steam passes through the capillary core into the vacuum cavity of the heat pipe, and forms a steam flow under the push of the gas pressure and flows to the heat pipe condensation section. Because the temperature of the heat pipe condensation section is relatively lower than that of the heat pipe evaporation section, the steam flow releases heat at low temperature and condenses into liquid. Through the capillary action of the capillary core on the inner wall of the heat pipe, it flows back to the heat pipe evaporation section. The transformation and circulation of the vapor-liquid two-phase are carried out in this way, so that heat is continuously transmitted from the heat pipe evaporation section to the heat pipe condensation section, and the heat transfer is completed.

[0026] EMBODIMENT The embodiment discloses an energy collaborative system based on photovoltaic-PN junction double-mode temperature control, which comprises a solar photovoltaic panel 4, a semiconductor refrigeration unit and a heat dissipation unit which are sequentially connected from top to bottom, and the solar photovoltaic panel 4 and the semiconductor refrigeration unit are electrically connected through a bidirectional DC-DC converter; the heat dissipation unit comprises a plurality of fin heat dissipation mechanisms 6 which are arranged in parallel, at least one heat pipe 7 is arranged in each fin heat dissipation mechanism 6, one end of the heat pipe 7 is embedded in the fin heat dissipation mechanism 6, the other end of the heat pipe 7 extends to the outside of the fin heat dissipation mechanism 6, and the one end of the heat pipe 7 is lower than the other end of the heat pipe 7; and the other end of the heat pipe 7 is connected into a phase change heat storage unit. The solar photovoltaic panel 4 inputs a forward current to the semiconductor refrigeration unit through the bidirectional DC-DC converter in a strong light and high temperature state, the semiconductor refrigeration unit refrigerates and the temperature of the hot end of the semiconductor refrigeration unit gradually rises to 60-80 DEG C, the heat of the hot end of the semiconductor refrigeration unit is conducted to the heat pipe 7 through the fin heat dissipation mechanism 6, the working medium in the heat pipe 7 evaporates and vaporizes along the heat pipe to the other end, and the heat pipe 7 condenses and releases heat and stores heat in the phase change heat storage unit; the solar photovoltaic panel 4 outputs a reverse current in a weak light and low temperature working condition state, the semiconductor refrigeration unit is switched to a thermoelectric power generation mode, and an energy storage battery is connected to store the current, so as to supplement night electricity consumption; meanwhile, as the ambient temperature decreases, the heat stored in the phase change heat storage unit starts to release heat, so as to provide heat for night low temperature heating; through reasonable setting of the component structure, the problems of solar photovoltaic panel temperature rise efficiency decay and night energy waste are solved, and the functions of power generation / refrigeration / heat storage are realized.

[0027] The semiconductor refrigeration unit of the embodiment outputs a reverse current in the thermoelectric power generation mode, and is connected to an energy storage battery through an MPPT controller, the MPPT controller adopts a bidirectional energy control circuit, and the switching between the refrigeration and the thermoelectric power generation mode of the semiconductor refrigeration unit can be realized.

[0028] The solar photovoltaic panel 4 of the embodiment is preferably a single crystal silicon PERC photovoltaic panel, the bidirectional DC-DC converter is preferably a THS60-20B12 model, and the fin heat dissipation mechanism 6 is preferably a DS-AL-2020 model, the substrate of which is an aluminum alloy, thirty fins (20 mm in height and 2 mm in pitch) are extended on the surface, and a SiO2-TiO2 radiation coating is coated, so that non-power consumption radiation heat dissipation is realized through an atmospheric window band (8-13 mu m).

[0029] The solar photovoltaic panel 4 and the phase change heat storage unit of the embodiment are internally provided with temperature sensors, so that the temperature can be monitored in real time.

[0030] The part of the heat pipe 7 embedded in the fin heat dissipation mechanism 6 is a heat pipe evaporation section, which is welded inside the fin heat dissipation mechanism 6; the other part of the heat pipe 7 is a heat pipe condensation section, which is higher than the heat pipe evaporation section; the working medium in the heat pipe evaporation section rises to the heat pipe condensation section under the action of density difference and capillary force, and the working medium in the heat pipe condensation section returns to the heat pipe evaporation section under the action of gravity, so as to realize the circulation of the working medium. The heat pipe evaporation section of the embodiment is parallel and equal in height to the axis of the fin heat dissipation mechanism 6, a plurality of heat pipes 7 are arranged in each fin heat dissipation mechanism 6, and the heat pipe evaporation sections are arranged in an array in the fin heat dissipation mechanism 6; the heat pipe evaporation section needs to be deeply embedded in the fin heat dissipation mechanism 6 to maximize the contact area with the base plate of the fin heat dissipation mechanism 6, so as to improve the heat conduction efficiency from the fin heat dissipation mechanism 6 to the evaporation section.

[0031] In the embodiment, the heat pipe 7 is an oxygen-free copper heat pipe with a diameter of 3 mm, the heat pipe evaporation section is welded in the fin heat dissipation mechanism 6, the heat pipe condensation section extends upward and is embedded in the phase change heat storage unit, and the working medium in the heat pipe 7 is preferably paraffin.

[0032] The phase change heat storage unit of the embodiment includes a sealed container, which is filled with a paraffin / graphite composite material. The paraffin / graphite composite material used in the embodiment is a common material available on the market, and the graphite content is preferably 15%. The other end of the heat pipe 7 is arranged in a serpentine shape and embedded in the sealed container, so as to maximize the contact area between the heat pipe condensation section of the heat pipe 7 and the paraffin / graphite composite material and improve the heat storage efficiency.

[0033] The embodiment further includes a hot water circulation pipeline arranged in the sealed container, which is connected to a water storage tank or a heating terminal; the other end of the heat pipe 7 is connected to the phase change heat storage unit, and the heat pipe 7 in the sealed container is not in contact with the hot water circulation pipeline. The heat exchange pipeline is a copper pipe, which is coiled in the sealed container and connected to a domestic water tank or a floor heating system; as the ambient temperature continues to drop, the paraffin / graphite composite material in the sealed container begins to solidify and releases the stored latent heat, and the water in the copper pipe absorbs heat and the water temperature rises to 45-50°C; then the heated water is pumped to the water storage tank or the heating terminal by the external water pump.

[0034] The semiconductor refrigeration unit of the embodiment comprises a plurality of TEC refrigeration pieces 5 arranged in parallel, the TEC refrigeration piece 5 is preferably a BYTEC-12705B model, adopts a Bi2Te3-based refrigeration piece, each TEC refrigeration piece 5 corresponds to each fin heat dissipation mechanism 6; the TEC cold end 5-1 of any TEC refrigeration piece 5 is connected with the lower part of the solar photovoltaic panel 4, the lower part of the photovoltaic panel 4 of the embodiment is attached to the TEC cold end 5-1 through a heat-conducting adhesive layer, so that the TEC cold end 5-1 is closely physically attached to the solar photovoltaic panel 4, the purpose is to reduce the contact thermal resistance and strengthen the refrigeration heat transfer efficiency of the TEC to the solar photovoltaic panel 4; the TEC hot end 5-2 of any TEC refrigeration piece 5 is connected with the upper part of the fin heat dissipation mechanism 6. Each TEC refrigeration piece 5 of the embodiment is arranged in an array along the bottom surface of the photovoltaic panel 3.

[0035] The bidirectional DC-DC converter of the embodiment connects the output end of the solar photovoltaic panel 4 and the TEC refrigeration piece 5, supports bidirectional adjustment of 0~12V voltage and 0~5A current; the electrical connection of the bidirectional DC-DC converter is realized through a wire, one end of which is connected with the output electrode of the solar cell piece 4 (drawn out from the edge of the photovoltaic panel, independent of the back plate attachment area), the other end of which is connected with the power supply electrode of the TEC (the electrode interface of the TEC is independently arranged outside the cold and hot ends, and does not overlap with the heat attachment area of the heat-conducting adhesive layer), forming an independent electrical circuit. The electrical connection path is completely separated from the heat attachment area of the heat-conducting adhesive layer, neither affecting the heat transfer effect of the heat-conducting adhesive nor interfering with the current adjustment function of the circuit.

[0036] The embodiment also comprises a tempered glass 2 above the solar photovoltaic panel 4, the tempered glass 2 completely covers the solar photovoltaic panel 4, the tempered glass 2 and the solar photovoltaic panel 4 are connected through the limiting connection of the shell frame 1, and further comprises an EVA plate 3 arranged between the tempered glass 2 and the solar photovoltaic panel 4, the outer periphery of the EVA plate 3 is sealed and connected with the inner periphery of the shell frame 1; as a whole, it plays a protective role of preventing rain and dust for the solar photovoltaic panel 4.

[0037] The embodiment also discloses a control method of an energy collaborative system based on photovoltaic-PN junction dual-mode temperature control, including strong light high temperature working condition and weak light low temperature working condition; The strong light high temperature working condition is specifically: when the solar photovoltaic panel 4 is greater than 40℃ and the illumination is greater than 800W / m², the bidirectional DC-DC converter inputs a forward current to the semiconductor refrigeration unit, the semiconductor refrigeration unit refrigerates and the temperature of the hot end thereof gradually rises to 60~80℃, the heat of the hot end of the semiconductor refrigeration unit is conducted to the heat pipe 7 through the fin heat dissipation mechanism 6, the working medium in the heat pipe 7 evaporates and vaporizes along the flow direction of the heat pipe to the other end, the heat pipe 7 condenses and releases heat in the phase change heat storage unit, and the paraffin / graphite composite material in the sealed container melts and stores heat; The weak light low temperature working condition is specifically: when the ambient temperature is less than 15 DEG C and the output power of the solar photovoltaic panel 4 is less than 30% of the rated value, the semiconductor refrigeration unit is switched to the thermoelectric power generation mode to output a reverse current, and an energy storage battery is externally connected to store the current; at the same time, as the ambient temperature decreases, the paraffin / graphite composite material in the sealed container solidifies, releases the stored latent heat, and the water in the copper pipe absorbs heat, and the water temperature rises to 45-50 DEG C, and then the water pump connected outside sends the heated water to the water storage tank or the heating terminal.

[0038] The preferred embodiments of the present disclosure are described in detail above in combination with the drawings, but the present disclosure is not limited to the specific details in the above-described embodiments, and various simple modifications can be made to the technical solutions of the present disclosure within the technical concept of the present disclosure, and these simple modifications all belong to the protection scope of the present disclosure.

[0039] In addition, it should be noted that various specific technical features described in the above specific embodiments can be combined in any appropriate manner without contradiction, and in order to avoid unnecessary repetition, the present disclosure will not further describe various possible combination manners.

[0040] In addition, various different embodiments disclosed in the present solution can also be combined in any manner, as long as it does not deviate from the idea of the present solution, and it should also be considered as the content invented by the present solution.

Claims

1. An energy synergy system based on photovoltaic-PN junction dual-mode temperature control, characterized in that, It includes a solar photovoltaic panel (4), a semiconductor refrigeration unit and a heat dissipation unit connected sequentially from top to bottom. The solar photovoltaic panel (4) and the semiconductor refrigeration unit are also electrically connected through a bidirectional DC-DC converter. The heat dissipation unit includes multiple finned heat dissipation mechanisms (6) arranged in parallel. At least one heat pipe (7) is installed in each finned heat dissipation mechanism (6). One end of the heat pipe (7) is embedded in the finned heat dissipation mechanism (6), and the other end of the heat pipe (7) extends to the outside of the finned heat dissipation mechanism (6). One end of the heat pipe (7) is lower than the other end of the heat pipe (7). It also includes a phase change thermal storage unit, with the other end of the heat pipe (7) connected to the phase change thermal storage unit.

2. The energy synergy system based on photovoltaic-PN junction dual-mode temperature control as described in claim 1, characterized in that, The portion of the heat pipe (7) embedded in the finned heat dissipation mechanism (6) is the heat pipe evaporation section, which is parallel to and at the same height as the axis of the finned heat dissipation mechanism (6).

3. The energy synergy system based on photovoltaic-PN junction dual-mode temperature control as described in claim 2, characterized in that, Multiple heat pipes (7) are installed inside each finned heat dissipation mechanism (6), and the evaporation sections of each heat pipe are arranged in an array within the finned heat dissipation mechanism (6).

4. The energy synergy system based on photovoltaic-PN junction dual-mode temperature control as described in any one of claims 1-3, characterized in that, The phase change thermal energy storage unit includes a sealed container filled with paraffin / graphite composite material, and a hot water circulation pipe running through the sealed container, which is connected to a water storage tank or a heating terminal. The other end of the heat pipe (7) is connected to the phase change heat storage unit, and the heat pipe (7) inside the sealed container is not in contact with the hot water circulation pipeline.

5. The energy synergy system based on photovoltaic-PN junction dual-mode temperature control as described in claim 4, characterized in that, The other end of the heat pipe (7) is embedded in the sealed container in a serpentine arrangement.

6. The energy synergy system based on photovoltaic-PN junction dual-mode temperature control as described in claim 5, characterized in that, The semiconductor cooling unit includes multiple TEC cooling chips (5) arranged in parallel, and each TEC cooling chip (5) corresponds to a finned heat dissipation mechanism (6). The TEC cold end (5-1) of any TEC cooling chip (5) is connected to the lower part of the solar photovoltaic panel (4), and the TEC hot end (5-2) of any TEC cooling chip (5) is connected to the upper part of the fin heat dissipation mechanism (6).

7. The energy synergy system based on photovoltaic-PN junction dual-mode temperature control as described in claim 6, characterized in that, Each TEC cooling element (5) is arranged in an array along the bottom surface of the photovoltaic panel (3).

8. The energy synergy system based on photovoltaic-PN junction dual-mode temperature control as described in claim 7, characterized in that, It also includes tempered glass (2) located above the solar photovoltaic panel (4), the tempered glass (2) completely covering the solar photovoltaic panel (4), and the tempered glass (2) and the solar photovoltaic panel (4) are connected by a frame (1) of the outer shell.

9. The energy synergy system based on photovoltaic-PN junction dual-mode temperature control as described in claim 8, characterized in that, It also includes an EVA board (3) disposed between the tempered glass (2) and the solar photovoltaic panel (4), wherein the outer periphery of the EVA board (3) is sealed to the inner periphery of the outer casing frame (1).

10. The control method for an energy synergy system based on photovoltaic-PN junction dual-mode temperature control as described in any one of claims 1-9, characterized in that, This includes both high-light, high-temperature operating conditions and low-light, low-temperature operating conditions. The high-temperature working condition is as follows: when the solar photovoltaic panel (4) is >40°C and the light intensity is >800W / m², the bidirectional DC-DC converter inputs a positive current to the semiconductor refrigeration unit, the semiconductor refrigeration unit cools and the temperature of its hot end gradually rises to 60~80°C, the heat of the hot end of the semiconductor refrigeration unit is conducted to the heat pipe (7) through the fin heat dissipation mechanism (6), the working fluid in the heat pipe (7) evaporates and vaporizes and flows to the other end along the heat pipe, and the heat pipe (7) condenses and releases heat and stores heat in the phase change heat storage unit; The low light and low temperature working condition is as follows: when the ambient temperature is <15℃ and the output power of the solar photovoltaic panel (4) is <30% of the rated value, the semiconductor cooling unit switches to the thermoelectric power generation mode to output reverse current and connects to the external energy storage battery to store the current; at the same time, as the ambient temperature decreases, the heat stored in the phase change heat storage unit begins to release heat.

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