Photovoltaic photo-thermal coupling system with multilayer structure

Abstract

The utility model provides a photovoltaic photo-thermal coupling system with a multilayer structure, which comprises a central shaft, an upper-layer semitransparent photovoltaic cell, a lower-layer semitransparent photovoltaic cell and a photo-thermal reflecting mirror, and the upper-layer semitransparent photovoltaic cell, the lower-layer semitransparent photovoltaic cell and the photo-thermal reflecting mirror can respectively rotate around the axis of the central shaft; each of the upper-layer semitransparent photovoltaic cell and the lower-layer semitransparent photovoltaic cell comprises a light-transmitting area and a light-absorbing area which are arranged in a staggered manner, and when the upper-layer semitransparent photovoltaic cell and the lower-layer semitransparent photovoltaic cell are aligned, the light-absorbing area of the upper-layer semitransparent photovoltaic cell and the light-absorbing area of the lower-layer semitransparent photovoltaic cell are distributed in a staggered manner. According to the photovoltaic photo-thermal coupling system with the multilayer structure, the overlapping state between the light absorption areas of the upper-layer semitransparent photovoltaic cell and the lower-layer semitransparent photovoltaic cell can be adjusted, so that the light transmittance of the system can be dynamically adjusted, the dynamic balance optimization of photovoltaic power generation and photo-thermal power generation is further realized, and the comprehensive energy efficiency of the system is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to photovoltaic photo-thermal coupling technical field especially is related to a multilayer structure's photovoltaic photo-thermal coupling system. BACKGROUND

[0002] The existing photovoltaic photo-thermal coupling system mainly combines photovoltaic cell and light-heat reflector together, utilizes photovoltaic cell to absorb ultraviolet light and visible light in solar radiation to generate electricity, and utilizes light-heat reflector to reflect infrared light that transmits through photovoltaic cell to light-heat collector to carry out photo-thermal power generation.

[0003] However, the conventional photovoltaic photo-thermal coupling system usually adopts fixed structure, fixes the installation position of photovoltaic cell and light-heat reflector, which makes the system unable to carry out effective dynamic adjustment under different illumination conditions and seasonal changes, thereby influencing the power generation performance of photovoltaic photo-thermal coupling system. SUMMARY

[0004] The utility model discloses a multilayer structure's photovoltaic photo-thermal coupling system can solve the problem in the above background art.

[0005] The utility model provides a multilayer structure's photovoltaic photo-thermal coupling system, including central axis, upper layer semi -transparent photovoltaic cell, lower layer semi -transparent photovoltaic cell and light-heat reflector, upper layer semi -transparent photovoltaic cell lower layer semi -transparent photovoltaic cell with light-heat reflector is installed in sequence on central axis from top to bottom, and upper layer semi -transparent photovoltaic cell lower layer semi -transparent photovoltaic cell with light-heat reflector can rotate around the axis line of central axis respectively;

[0006] Upper layer semi -transparent photovoltaic cell and lower layer semi -transparent photovoltaic cell all include the light -transmitting region and light -absorbing region of staggered arrangement, when upper layer semi -transparent photovoltaic cell with lower layer semi -transparent photovoltaic cell is aligned and set, the light -absorbing region of upper layer semi -transparent photovoltaic cell with lower layer semi -transparent photovoltaic cell is staggered distribution.

[0007] According to the multilayer structure's photovoltaic photo-thermal coupling system provided by the utility model, upper layer semi -transparent photovoltaic cell includes a plurality of upper layer photovoltaic cell units that are evenly distributed on the same plane, and each upper layer photovoltaic cell unit includes a plurality of upper layer light -transmitting regions and upper layer light -absorbing regions that are staggered arranged.

[0008] According to the multilayer structure's photovoltaic photo-thermal coupling system provided by the utility model, lower layer semi -transparent photovoltaic cell includes a plurality of lower layer photovoltaic cell units that are evenly distributed on the same plane, and each lower layer photovoltaic cell unit includes a plurality of lower layer light -transmitting regions and lower layer light -absorbing regions that are staggered arranged.

[0009] The photovoltaic-photothermal coupling system with a multi-layer structure comprises a plurality of upper-layer photovoltaic cell units and a plurality of lower-layer photovoltaic cell units, and a plurality of light-heat reflecting mirrors.

[0010] The photovoltaic-photothermal coupling system with a multi-layer structure comprises a plurality of upper-layer photovoltaic cell units and a plurality of lower-layer photovoltaic cell units, and a plurality of light-heat reflecting mirrors.

[0011] The photovoltaic-photothermal coupling system with a multi-layer structure comprises a plurality of upper-layer photovoltaic cell units and a plurality of lower-layer photovoltaic cell units, and a plurality of light-heat reflecting mirrors.

[0012] The photovoltaic-photothermal coupling system with a multi-layer structure comprises a plurality of upper-layer photovoltaic cell units and a plurality of lower-layer photovoltaic cell units, and a plurality of light-heat reflecting mirrors.

[0013] The photovoltaic-photothermal coupling system with a multi-layer structure comprises a plurality of upper-layer photovoltaic cell units and a plurality of lower-layer photovoltaic cell units, and a plurality of light-heat reflecting mirrors.

[0014] The photovoltaic-photothermal coupling system with a multi-layer structure comprises a plurality of upper-layer photovoltaic cell units and a plurality of lower-layer photovoltaic cell units, and a plurality of light-heat reflecting mirrors.

[0015] The photovoltaic-photothermal coupling system with a multi-layer structure comprises a plurality of upper-layer photovoltaic cell units and a plurality of lower-layer photovoltaic cell units, and a plurality of light-heat reflecting mirrors.

[0016] The photovoltaic-photothermal coupling system with the multi-layer structure provided by the utility model has the advantages that the upper layer semi-transparent photovoltaic cell, the lower layer semi-transparent photovoltaic cell and the photothermal reflector can be rotated around the axis of the central shaft, thereby realizing dynamic adjustment of the positions of the upper layer semi-transparent photovoltaic cell, the lower layer semi-transparent photovoltaic cell and the photothermal reflector; since the upper layer semi-transparent photovoltaic cell and the lower layer semi-transparent photovoltaic cell both comprise light-transmitting regions and light-absorbing regions arranged alternately, when the upper layer semi-transparent photovoltaic cell and the lower layer semi-transparent photovoltaic cell are arranged in alignment, the light-absorbing regions of the upper layer semi-transparent photovoltaic cell and the lower layer semi-transparent photovoltaic cell are arranged in alternation, thereby, by adjusting the overlapping state between the light-absorbing regions of the upper layer semi-transparent photovoltaic cell and the lower layer semi-transparent photovoltaic cell, dynamic adjustment of the light transmittance of the system is realized, and dynamic balance optimization of photovoltaic power generation and photothermal power generation is realized, and the comprehensive energy efficiency of the system is improved. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the specific embodiments of the utility model or the technical solutions in the prior art, the drawings needed to be used in the following specific embodiments or prior art description will be briefly introduced, and obviously, the drawings in the following description are some embodiments of the utility model, and other drawings can also be obtained by those skilled in the art without creative labor.

[0018] Figure 1 It is a structural schematic view of the photovoltaic-photothermal coupling system with the multi-layer structure of the utility model;

[0019] Figure 2 It is an installation schematic view of the upper layer semi-transparent photovoltaic cell in the photovoltaic-photothermal coupling system with the multi-layer structure of the utility model;

[0020] Figure 3 It is an installation schematic view of the lower layer semi-transparent photovoltaic cell in the photovoltaic-photothermal coupling system with the multi-layer structure of the utility model;

[0021] Figure 4 It is an installation schematic view of the photothermal reflector in the photovoltaic-photothermal coupling system with the multi-layer structure of the utility model;

[0022] Figure 5 It is a structural schematic view when the upper layer light-absorbing region and the lower layer light-absorbing region in the utility model present complete overlap;

[0023] Figure 6 It is Figure 5 It is a state schematic view of the upper layer semi-transparent photovoltaic cell when the upper layer semi-transparent photovoltaic cell and the lower layer semi-transparent photovoltaic cell present complete overlap;

[0024] Figure 7 It is Figure 5State when the state of the upper layer semi-transparent photovoltaic cell is shown in the schematic diagram;

[0025] Figure 8 For the structure schematic diagram when the upper layer light absorption area and the lower layer light absorption area present partial overlap in the utility model;

[0026] Figure 9 For Figure 8 State when the state of the upper layer semi-transparent photovoltaic cell is shown in the schematic diagram;

[0027] Figure 10 For Figure 8 State when the state of the lower layer semi-transparent photovoltaic cell is shown in the schematic diagram;

[0028] Figure 11 For the structure schematic diagram when the upper layer light absorption area and the lower layer light absorption area present no overlap in the utility model;

[0029] Figure 12 For Figure 11 State when the state of the upper layer semi-transparent photovoltaic cell is shown in the schematic diagram;

[0030] Figure 13 For Figure 11 State when the state of the lower layer semi-transparent photovoltaic cell is shown in the schematic diagram;

[0031] Figure 14 For another structure schematic diagram when the upper layer light absorption area and the lower layer light absorption area present no overlap in the utility model;

[0032] Figure 15 For Figure 14 State when the state of the upper layer semi-transparent photovoltaic cell is shown in the schematic diagram;

[0033] Figure 16 For Figure 14 State when the state of the lower layer semi-transparent photovoltaic cell is shown in the schematic diagram;

[0034] Figure 17 For the elevation schematic diagram when the upper layer photovoltaic cell unit and the lower layer photovoltaic cell unit present offset overlap in the utility model;

[0035] Figure 18 For the structure schematic diagram when the upper layer photovoltaic cell unit and the lower layer photovoltaic cell unit adopt rectangular structure in the utility model, the structure of the two is completely shown in the schematic diagram;

[0036] Figure 19 For the structure schematic diagram when the upper layer photovoltaic cell unit and the lower layer photovoltaic cell unit adopt rectangular structure in the utility model, the structure of the upper layer semi-transparent photovoltaic cell is rotated 45 degrees relative to the lower layer semi-transparent photovoltaic cell shown in the schematic diagram;

[0037] Figure 20When the upper layer photovoltaic cell unit and the lower layer photovoltaic cell unit adopt the rectangular structure in the utility model, the structure schematic diagram when the upper layer semi-transparent photovoltaic cell rotates 90 degrees relative to the lower layer semi-transparent photovoltaic cell.

[0038] Marked with the figure:

[0039] 1, upper layer semi-transparent photovoltaic cell;1A, upper layer light transmission area;1B, upper layer light absorption area;2, lower layer semi-transparent photovoltaic cell;2A, lower layer light transmission area;2B, lower layer light absorption area;3, light heat reflector;4A, first shaft section;4B, second shaft section;4C, third shaft section;5, first servo motor;6, second servo motor;7, third servo motor;8, support base;9, second steering wheel;10, third steering wheel;11, first support;12, second support;13, third support;14, first steering wheel. Specific implementation

[0040] The technical scheme of the utility model will be described clearly and completely in combination with examples, obviously, the described examples are a part of the examples of the utility model, not all examples. Based on the examples in the utility model, all other examples obtained by the ordinary skill in the art without making creative labor belong to the protection scope of the utility model.

[0041] In the description of the utility model, it is understood that the orientation or position relation indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" and the like is the orientation or position relation based on the orientation or position relation shown in the drawings, and is only for the convenience of describing the utility model and simplifying the description, and is not indicated or implied that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore can not be understood as the limitation of the utility model.

[0042] In addition, the terms "first", "second", "third", "fourth", "fifth", "sixth", "seventh" and "eighth" are only used for descriptive purpose and cannot be understood as indicating or implying relative importance or implying the number of the technical features indicated. Therefore, the features defined with "first", "second", "third", "fourth", "fifth", "sixth", "seventh" and "eighth" can explicitly or implicitly include one or more of the features. In the description of the present application, "a plurality of" means two or more, unless otherwise specifically limited. In addition, the terms "mounting", "connecting", "connection" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0043] As shown in Figures 1 to 4 The photovoltaic-photothermal coupling system with multi-layer structure according to the embodiment of the present application comprises a central shaft, an upper layer semi-transparent photovoltaic cell 1, a lower layer semi-transparent photovoltaic cell 2 and a photothermal reflector 3. The upper layer semi-transparent photovoltaic cell 1, the lower layer semi-transparent photovoltaic cell 2 and the photothermal reflector 3 are sequentially mounted on the central shaft from top to bottom, and the upper layer semi-transparent photovoltaic cell 1, the lower layer semi-transparent photovoltaic cell 2 and the photothermal reflector 3 can rotate around the axis of the central shaft, so as to realize dynamic adjustment of the positions of the upper layer semi-transparent photovoltaic cell 1, the lower layer semi-transparent photovoltaic cell 2 and the photothermal reflector 3.

[0044] The upper layer semi-transparent photovoltaic cell 1 and the lower layer semi-transparent photovoltaic cell 2 each comprise light-transmitting regions and light-absorbing regions arranged alternately. When the upper layer semi-transparent photovoltaic cell 1 and the lower layer semi-transparent photovoltaic cell 2 are arranged in alignment, the light-absorbing regions of the upper layer semi-transparent photovoltaic cell 1 and the lower layer semi-transparent photovoltaic cell 2 are arranged alternately.

[0045] Since the upper layer semi-transparent photovoltaic cell 1 and the lower layer semi-transparent photovoltaic cell 2 can rotate horizontally around the axis of the central shaft, by adjusting the positions of the upper layer semi-transparent photovoltaic cell 1 and / or the lower layer semi-transparent photovoltaic cell 2, the overlapping degree of the light-absorbing regions of the upper layer semi-transparent photovoltaic cell 1 and the lower layer semi-transparent photovoltaic cell 2 can be changed, so as to realize dynamic adjustment of the light transmittance of the system, and further realize dynamic balance optimization of photovoltaic power generation and photothermal power generation, effectively improve the synergistic effect of photovoltaic power generation and photothermal power generation, and further improve the comprehensive energy efficiency of the system.

[0046] Specifically, the upper layer semi-transparent photovoltaic cell 1 includes a plurality of upper layer photovoltaic cell units uniformly distributed on the same plane, each of which includes a plurality of upper layer light-transmitting regions 1A and upper layer light-absorbing regions 1B arranged alternately. The lower layer semi-transparent photovoltaic cell 2 includes a plurality of lower layer photovoltaic cell units uniformly distributed on the same plane, each of which includes a plurality of lower layer light-transmitting regions 2A and lower layer light-absorbing regions 2B arranged alternately.

[0047] According to actual use requirements, the number of the upper layer photovoltaic cell units can be the same as or different from the number of the lower layer photovoltaic cell units.

[0048] In the embodiment, the number of the upper layer photovoltaic cell units is the same as the number of the lower layer photovoltaic cell units. When the number of the upper layer light-transmitting regions 1A is different from the number of the upper layer light-absorbing regions 1B, the number of the upper layer light-transmitting regions 1A can be the same as the number of the lower layer light-absorbing regions 2B, and the number of the upper layer light-absorbing regions 1B can be the same as the number of the lower layer light-transmitting regions 2A. At this time, when the upper layer semi-transparent photovoltaic cell 1 and the lower layer semi-transparent photovoltaic cell 2 are arranged in a vertically aligned manner, the upper layer light-transmitting regions 1A and the lower layer light-transmitting regions 2A can be arranged alternately, so that the upper layer semi-transparent photovoltaic cell 1 and the lower layer semi-transparent photovoltaic cell 2 form a complementary structure between the light-transmitting regions and the light-absorbing regions, thereby maximizing the utilization of sunlight of different wave bands.

[0049] Of course, the number of the upper layer light-transmitting regions 1A can be the same as the number of the upper layer light-absorbing regions 1B, and the number of the lower layer light-transmitting regions 2A and the number of the lower layer light-absorbing regions 2B can be the same.

[0050] Specifically, the light-heat reflecting mirror 3 includes a plurality of mirror units uniformly distributed on the same plane, and the number of the mirror units is the same as the number of the lower layer photovoltaic cell units.

[0051] Specifically, the central axis includes a first shaft segment 4A, a second shaft segment 4B and a third shaft segment 4C arranged in sequence from top to bottom, the bottom of the first shaft segment 4A is mounted on the output shaft of the first servo motor 5, the first servo motor 5 is mounted on the top of the second shaft segment 4B, the bottom of the second shaft segment 4B is mounted on the output shaft of the second servo motor 6, the second servo motor 6 is mounted on the top of the third shaft segment 4C, the bottom of the third shaft segment 4C is mounted on the output shaft of the third servo motor 7, and the third servo motor 7 is mounted on the support base 8. In this way, the first shaft segment 4A can be driven to rotate by the first servo motor 5, the second shaft segment 4B can be driven to rotate by the second servo motor 6, and the third shaft segment 4C can be driven to rotate by the third servo motor 7.

[0052] Wherein, each upper photovoltaic cell unit is installed on the first shaft segment 4A, each lower photovoltaic cell unit is installed on the second shaft segment 4B, and each mirror unit is installed on the third shaft segment 4C. That is, the position adjustment of the upper semi-transparent photovoltaic cell 1 can be realized by controlling the first servo motor 5, the position adjustment of the lower semi-transparent photovoltaic cell 2 can be realized by controlling the second servo motor 6, and the position adjustment of the light-heat mirror 3 can be realized by controlling the third servo motor 7.

[0053] Specifically, each upper photovoltaic cell unit is installed on the first steering wheel 14, and the first steering wheel 14 is installed on the first shaft segment 4A through the first support 11. Each lower photovoltaic cell unit is installed on the second steering wheel 9, and the second steering wheel 9 is installed on the second shaft segment 4B through the second support 12. Each mirror unit is installed on the third steering wheel 10, and the third steering wheel 10 is installed on the third shaft segment 4C through the third support 13. The first steering wheel 14 can drive the upper photovoltaic cell unit to adjust the inclination angle, the second steering wheel 9 can drive the lower photovoltaic cell unit to adjust the inclination angle, and the third steering wheel 10 can drive the mirror unit to adjust the inclination angle.

[0054] Therefore, by controlling the first steering wheel 14 and / or the second steering wheel 9, the offset between the upper photovoltaic cell unit and the lower photovoltaic cell unit can be adjusted, and the size of the offset degree can affect the size of the overall light transmission area of the system, thereby realizing the dynamic adjustment of the light transmission of the system.

[0055] And by adjusting the position and inclination angle of the light-heat mirror 3, the light-heat mirror 3 can have the best infrared light reflection path, and the light-heat conversion efficiency of the collector can be maximized.

[0056] The multi-layer structure photovoltaic-photothermal coupling system in the embodiment of the utility model in use, through to the upper semi-transparent photovoltaic cell 1 and the lower semi-transparent photovoltaic cell 2 carry out position and inclination angle adjustment, the upper semi-transparent photovoltaic cell 1 upper light absorption area 1B and the lower semi-transparent photovoltaic cell 2 lower light absorption area 2B between present complete overlap, partial overlap, no overlap, offset overlap, gradually overlap and so on state change adjustment.

[0057] As Figures 5-7As shown, when the upper light-absorbing region 1B and the lower light-absorbing region 2B completely overlap, the upper light-transmitting region 1A and the lower light-transmitting region 2A are not blocked. The upper semi-transparent photovoltaic cell 1 and the lower semi-transparent photovoltaic cell 2 absorb the least amount of visible and ultraviolet light, and the total amount of infrared light reflected by the photothermal reflector 3 is the greatest. Therefore, the system has the highest light transmittance. In this state, the system has high light transmittance, making it suitable for use in strong sunlight to increase the efficiency of the solar thermal power generation section. Therefore, this adjustment state is suitable for environments with strong sunlight and can maximize the output of solar thermal power generation.

[0058] like Figures 8-10 As shown, when the upper light-absorbing region 1B and the lower light-absorbing region 2B partially overlap, the upper light-transmitting region 1A and the lower light-transmitting region 2A are partially blocked, thus reducing the system's light transmittance. In this state, the ratio of solar thermal power generation to photovoltaic power generation can be better balanced, enhancing photovoltaic power generation capacity without sacrificing too much solar thermal power generation efficiency. Therefore, this adjustment state is suitable for use in environments with moderate sunlight, or when it is necessary to adjust the ratio of photovoltaic power generation to solar thermal power generation according to seasonal and weather changes.

[0059] like Figures 11-16 As shown, when the upper light-absorbing region 1B and the lower light-absorbing region 2B do not overlap, both are exposed and unobstructed, resulting in the lowest overall light transmittance of the system in this state. In this state, the total amount of infrared light reflected by the photothermal reflector 3 is minimized, leading to lower efficiency in the photothermal power generation section and maximized optimization in the photovoltaic power generation section. Therefore, this adjustment state is suitable for use in environments with weak sunlight or high photovoltaic power generation demand to maximize photovoltaic power generation efficiency.

[0060] When the upper light-absorbing region 1B and the lower light-absorbing region 2B overlap, the upper and lower photovoltaic cell units will be offset at a certain angle, and the degree of offset can affect the overall light-transmitting area of ​​the system. The facade when the upper and lower photovoltaic cell units overlap is shown in the image. Figure 17 As shown, by adjusting the degree of offset, a precise energy distribution can be achieved between concentrated solar power (CSP) and photovoltaic (PV) power generation. For example, increasing the overlap area between the upper light-absorbing region 1B and the lower light-absorbing region 2B can enhance the output of CSP; conversely, decreasing the overlap area between the upper light-absorbing region 1B and the lower light-absorbing region 2B can enhance the effect of PV power generation. Therefore, this adjustment state is suitable for environments requiring precise adjustment of the ratio of PV to CSP, especially for applications where the system's transmittance can be adjusted according to different seasons and solar irradiance conditions.

[0061] When the upper light-absorbing region 1B and the lower light-absorbing region 2B gradually overlap, the system transmittance can gradually increase or gradually decrease according to the light change. The transmittance of the system increases with the gradual increase of the light-absorbing region overlap; on the contrary, with the decrease of the light-absorbing region overlap, the overall transmittance area of the system gradually decreases, and the transmittance gradually decreases. Therefore, by adjusting the state, the transmittance can be dynamically adjusted according to the solar elevation angle and the solar intensity, which is suitable for use in a large change of light conditions, such as the change of light intensity in a day or seasonal change. The system can gradually adjust the ratio of photovoltaic power generation and photo-thermal power generation.

[0062] Specifically, according to the actual use requirement, the upper photovoltaic cell unit and the lower photovoltaic cell unit can be set as a rectangle, a square, a sector or other shapes. The rectangular photovoltaic cell unit is suitable for large-area arrangement and can efficiently capture sunlight. The square photovoltaic cell unit has high arrangement efficiency and can adapt to modular design. The sector photovoltaic cell unit is suitable for smaller space, has better aesthetic effect, and can reduce light reflection loss.

[0063] For example, in the embodiment of the present application Figures 5 to 16 , the upper photovoltaic cell unit and the lower photovoltaic cell unit adopt a sector structure. In the embodiment of the present application Figure 2 and Figure 3 , the upper photovoltaic cell unit and the lower photovoltaic cell unit adopt a rectangular structure. When the upper photovoltaic cell unit and the lower photovoltaic cell unit adopt a rectangular structure, the state of no overlap between the upper light-absorbing region 1B and the lower light-absorbing region 2B is as shown in Figure 18 , the state of partial overlap between the upper light-absorbing region 1B and the lower light-absorbing region 2B is as shown in Figure 19 and Figure 20 .

[0064] Finally, it should be pointed out that: the above embodiments are only used to illustrate the technical solutions of the present application, but not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A multilayer structured photovoltaic-photothermal coupled system, characterized in that, The center shaft, the upper layer semi-transparent photovoltaic cell, the lower layer semi-transparent photovoltaic cell and the light-heat mirror are sequentially installed on the center shaft from top to bottom, and the upper layer semi-transparent photovoltaic cell, the lower layer semi-transparent photovoltaic cell and the light-heat mirror can rotate around the axis of the center shaft respectively. The upper layer semi-transparent photovoltaic cell and the lower layer semi-transparent photovoltaic cell both comprise light-transmitting regions and light-absorbing regions arranged alternately, and the light-absorbing regions of the upper layer semi-transparent photovoltaic cell and the light-absorbing regions of the lower layer semi-transparent photovoltaic cell are arranged alternately when the upper layer semi-transparent photovoltaic cell and the lower layer semi-transparent photovoltaic cell are arranged in alignment.

2. The multilayer structured PV-PV / T system according to claim 1, characterized in that, The upper layer semi-transparent photovoltaic cell comprises a plurality of upper layer photovoltaic cell units uniformly distributed on the same plane, and each upper layer photovoltaic cell unit comprises a plurality of upper layer light-transmitting regions and upper layer light-absorbing regions arranged alternately.

3. The multilayer structured PV-PV / T system according to claim 2, characterized in that, The lower layer semi-transparent photovoltaic cell comprises a plurality of lower layer photovoltaic cell units uniformly distributed on the same plane, and each lower layer photovoltaic cell unit comprises a plurality of lower layer light-transmitting regions and lower layer light-absorbing regions arranged alternately.

4. The multilayer structured PV-PV / T system according to claim 3, characterized in that, The number of the upper layer photovoltaic cell units is the same as the number of the lower layer photovoltaic cell units, the number of the upper layer light-transmitting regions is the same as the number of the lower layer light-absorbing regions, and the number of the upper layer light-absorbing regions is the same as the number of the lower layer light-transmitting regions.

5. The multilayer structured PV-PV / T system according to claim 4, characterized in that, The light-heat mirror comprises a plurality of mirror units uniformly distributed on the same plane, and the number of the mirror units is the same as the number of the lower layer photovoltaic cell units.

6. The multilayer structured PV-PV / T system according to claim 5, characterized in that, The center shaft comprises a first shaft segment, a second shaft segment and a third shaft segment sequentially arranged from top to bottom, the bottom of the first shaft segment is installed on the output shaft of a first servo motor, the first servo motor is installed on the top of the second shaft segment, the bottom of the second shaft segment is installed on the output shaft of a second servo motor, the second servo motor is installed on the top of the third shaft segment, and the bottom of the third shaft segment is installed on the output shaft of a third servo motor; each upper layer photovoltaic cell unit is installed on the first shaft segment, each lower layer photovoltaic cell unit is installed on the second shaft segment, and each mirror unit is installed on the third shaft segment.

7. The multilayer structured PV-PV / T system according to claim 6, characterized in that, A support base is further provided, and the third servo motor is installed on the support base.

8. The multilayer structured PV-PV / T system according to claim 6, characterized in that, Each upper layer photovoltaic cell unit is installed on a first steering engine, and the first steering engine is installed on the first shaft segment through a first support.

9. The multilayer structured PV-PV / T system according to claim 6, wherein, Each lower layer photovoltaic cell unit is installed on a second steering engine, and the second steering engine is installed on the second shaft segment through a second support.

10. The multi-layered structure photovoltaic photothermal coupled system according to claim 6, wherein, Each mirror unit is installed on a third steering engine, and the third steering engine is installed on the third shaft segment through a third support.

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