WO2015135458A1

WO2015135458A1 - Trough-type point-focusing device for exploitation of solar energy

Info

Publication number: WO2015135458A1
Application number: PCT/CN2015/073923
Authority: WO
Inventors: 容云
Original assignee: 容云
Priority date: 2014-03-10
Filing date: 2015-03-10
Publication date: 2015-09-17
Also published as: CN104917444A; CN104917444B

Abstract

A trough-type point-focusing device for exploitation of solar energy, comprising: a support apparatus (220), itself comprising a support frame (222) and a base (224) arranged symmetrically on either side of the support frame (222); a plurality of point-focusing light components (240) arranged symmetrically on the base (224) at either side of the support frame (222) so as to form a trough-like structure and used for receiving solar light and focusing same; a plurality of photoelectric conversion devices (260), located on the frame (222) at points opposite the base (224), equal in number to the plurality of point-focusing components (240) and in one-to-one correspondence with same; the light-reception port of each photoelectric conversion device (260) is oriented to face the corresponding point-focusing component (240) and is positioned at the focal point of same, said device being used to convert to electricity the solar light collected by the point-focusing component (240). Implementation of the trough-like structure to collect light facilitates use of a cleaning device to clean the present trough-type point-focusing device for exploitation of solar energy, while the use of point-focusing to collect light yields a higher utilization rate of solar energy.

Description

Quasi-slot point concentrating solar energy utilization device

Related application

The present application claims priority to the Chinese Patent Application No. 20141008528, filed on Mar.

Technical field

The invention relates to the technical field of solar energy application, in particular to a quasi-slot type spot concentrating solar energy utilization device.

Background technique

Concentrated solar power is the first to concentrate the sunlight through the concentrator, and then convert the concentrated solar energy into electrical energy. It has two conversion methods, one is to convert the concentrated sunlight into electric energy through the semiconductor photoelectric conversion element. For example, concentrating photovoltaic power generation; another way is to convert the sunlight that the sun gathers into heat energy and then convert the heat energy into kinetic energy through the heat cycle, and use kinetic energy to drive the generator to generate electricity, such as concentrating solar thermal power generation.

Conventional point concentrating power generation devices generally adopt an umbrella structure to receive solar energy, which is not conducive to cleaning the receiving device.

Summary of the invention

Based on this, it is necessary to provide a quasi-slot point concentrating solar energy utilization device which is advantageous for cleaning, in view of the problem that the umbrella receiving structure of the spot concentrating power generation device is not conducive to cleaning.

A quasi-slot point concentrating solar energy utilization device comprising:

The supporting device comprises a bracket and a base, and the base is symmetrically distributed on two sides of the bracket;

a plurality of spot concentrating elements are symmetrically distributed on the bases on both sides of the bracket to form a quasi-slot structure for receiving and collecting sunlight;

a plurality of photoelectric conversion devices located at an end of the bracket opposite to the base, the photoelectric conversion

The device is equal in number to the spot concentrating elements and is in one-to-one correspondence with the spot concentrating elements, and the light receiving port of the photoelectric conversion device faces the corresponding spot concentrating element and is concentrated at the corresponding spot concentrating element a focus; for converting sunlight concentrated by the point concentrating elements into electrical energy.

In one embodiment, the point concentrating element is a reflective point concentrating element, and the focal spot of the point concentrating element is 0.8m-1.5m, and each of the point concentrating elements is opposite to the corresponding photoelectric conversion The angle of incidence of the device is less than 30°.

In one embodiment, the spot concentrating element is a parabolic mirror.

Wherein the light receiving area in one embodiment, the parabolic mirror is 0.2m ^² -0.75m ^2, the incident light spot area of the parabolic mirror receiving the light opening formed of the photoelectric conversion means is less than 35mm * 35mm, the The ratio of the area of the light receiving area to the area of the incident spot is greater than 250.

In one embodiment, the ratio of the focal length of the parabolic mirror to the square root of the light receiving area is greater than 1.2 and less than 3.

In one embodiment, the photoelectric conversion device comprises:

a plurality of photovoltaic cells are respectively disposed on the heat conducting circuit board for converting sunlight concentrated by the point concentrating elements into electrical energy;

a plurality of the heat conducting circuit boards for respectively fixing each of the photovoltaic cells and conducting heat energy generated when the photovoltaic cells operate;

a plurality of conductive sheets respectively disposed on the heat conducting circuit board and respectively connected to the photovoltaic cells for deriving electrical energy generated by the photovoltaic cells to an external circuit;

a heat sink connected to the thermal circuit board for deriving thermal energy generated when the photovoltaic cell is in operation;

The outer casing is configured to receive the photovoltaic cell, the thermal conductive circuit board, the conductive sheet and the heat sink, and is provided with a light receiving port, and the photovoltaic cell receives the sunlight concentrated by the point concentrating element through the light receiving port.

In one embodiment, the photovoltaic cells are multi-junction gallium arsenide photovoltaic cells, each of which has a light receiving range of greater than or equal to 9 mm*9 mm.

In one embodiment, the number of the photovoltaic cells is four, and the photovoltaic cells are arranged in a square matrix; wherein the diagonally arranged photovoltaic cells are connected in parallel with each other and respectively connected to the protection circuit.

In one embodiment, the photovoltaic cells of the photoelectric conversion device corresponding to the different spot concentrating elements are connected in series with each other.

In one embodiment, the photoelectric conversion device further includes a secondary concentrator, the secondary concentrator includes a light input end and a light output end; the light input end is provided with a plurality of light entrance ports, the plurality of The light incident openings are densely arranged in a matrix, and the light output end is provided with a plurality of light output ports corresponding to the light incident ports, the light output ports are optically connected to the photovoltaic cells; The device condenses the sunlight incident from the light receiving port and injects the secondary condensed sunlight into the photovoltaic cell.

The quasi-slot type concentrating solar energy utilization device condenses light by forming a quasi-groove structure by a plurality of spot concentrating elements, and condenses the dots by a plurality of photoelectric conversion devices that are in one-to-one correspondence with the plurality of spot concentrating elements. The sunlight concentrated by the components is converted into electrical energy. The quasi-slot structure facilitates cleaning of the quasi-slot type concentrating solar energy utilization device by the cleaning device; and receiving solar energy through the spot concentrating element, and the solar energy utilization rate is high.

DRAWINGS

1 is a schematic view of a quasi-slot point concentrating solar energy utilization device according to an embodiment of the present invention;

2 is a schematic diagram of a quasi-slot point concentrating solar energy utilization device according to another embodiment of the present invention;

Figure 3 is a plan view showing the arrangement of the spot concentrating elements on the side of the bracket of the embodiment shown in Figure 2;

4 is a schematic diagram of a receiving port of the embodiment shown in FIG. 2;

5 is a schematic view showing an incident angle of a point concentrating element of the embodiment shown in FIG. 2 with respect to a corresponding photoelectric conversion device;

Figure 6 is a schematic view of the photoelectric conversion device of the embodiment shown in Figure 2;

Fig. 7 is a schematic view showing a photoelectric conversion device in another embodiment.

detailed description

A quasi-slot point concentrating solar energy utilization device, which is provided with a plurality of spot concentrating elements as a quasi-slot structure, which facilitates subsequent cleaning of the plurality of spot concentrating elements, and concentrating elements for each point The corresponding photoelectric conversion devices are provided to improve the utilization rate of solar energy. By setting the characteristic parameters of the spot concentrating element and the corresponding parameter data of the photoelectric conversion device, the heat dissipation device, the conductive structure, the support structure and the like, the utilization rate of the solar energy is further improved, and the manufacturing cost and the maintenance cost are reduced. By arranging at least one row of photovoltaic cells on both sides of the supporting device, the photoelectric conversion devices corresponding to the adjacent photovoltaic cells can share one receiving port between the rows, thereby reducing the production cost of the quasi-slot concentrating solar energy utilization device. And facilitates the placement of the circuit and coolant lines. In the arrangement of the photoelectric conversion device, by arranging a plurality of matrix-arranged photovoltaic cells on a plurality of thermal conductive circuit boards, each of the batteries is connected in parallel with each other and connected to the protection circuit respectively, and if one of the photovoltaic cells fails during use The corresponding photovoltaic cells can be replaced separately, so as not to affect the normal use of other photovoltaic cells, and the use of the entire photoelectric conversion device is not affected, thereby further improving the feasibility of the quasi-slot type concentrating solar energy utilization device and improving the overall system. Life expectancy and maintenance costs are reduced.

A quasi-slot point concentrating solar energy utilization device of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

FIG. 1 is a schematic diagram of a quasi-slot point concentrating solar energy utilization device according to an embodiment of the present invention.

Referring to FIG. 1, a quasi-slot point concentrating solar energy utilization device 100 includes a support device 120, a plurality of spot concentrating elements 140, and a plurality of photoelectric conversion devices 160.

The supporting device 120 includes a bracket 122 and a base 124. The base 124 is symmetrically distributed on two sides of the bracket 122. The plurality of spot concentrating elements 140 are symmetrically distributed on the bases 124 on both sides of the bracket 122 to form a quasi-slot structure; The photoelectric conversion device 160 is located at one end of the bracket 122 opposite to the base 124. The photoelectric conversion device 160 is equal in number to the spot concentrating element 140 and corresponds to the spot concentrating element 140. The light receiving port of the photoelectric conversion device 160 faces the corresponding one. The spot concentrating element 140 is located at the concentrating focus of the corresponding spot concentrating element 140.

In the quasi-slot point concentrating solar energy utilization device 100, the point concentrating element 140 receives and condenses sunlight, and the photoelectric conversion device 160 corresponding to the point concentrating element 140 converts the sunlight concentrated by the point concentrating element 140 into electric energy. . The solar light receiving portion of the quasi-slot type concentrating solar energy utilization device, that is, the overall structure of the point concentrating element 140 is configured as a quasi-groove structure, and a corresponding photoelectric conversion device 160 is provided for each of the spot concentrating elements 140. In improvement At the same time as the subsequent cleaning work, the utilization rate of solar energy is further improved. Combining the trough structure with the spot concentrating technology, the more spot concentrating elements 140 can share the same supporting device 120, allowing the space above the concentrating element 140 to be opened, thereby facilitating subsequent use of the automatic cleaning device (not shown) The spot concentrating element 140 is cleaned, and the operation of replacing the spot concentrating element 140 is facilitated, and the upper bracket 122 laterally connects the photoelectric conversion devices 160, which facilitates the arrangement of the wires and the heat dissipation circuit (not shown).

FIG. 2 is a schematic diagram of a quasi-slot point concentrating solar energy utilization device according to another embodiment of the present invention.

Referring to FIG. 2, a quasi-slot point concentrating solar energy utilization device 200 includes a support device 220, a plurality of spot concentrating elements 240, and a plurality of photoelectric conversion devices 260.

The supporting device 220 includes a bracket 222 and a base 224. The base 224 is symmetrically distributed on two sides of the bracket 222, and a plurality of spot concentrating elements 240 are symmetrically distributed on the base 224 on both sides of the bracket 222 to form a quasi-slot structure; The photoelectric conversion device 260 is located at one end of the bracket 222 opposite to the base 224. The photoelectric conversion device 260 is equal in number to the spot concentrating element 240 and corresponds to the spot concentrating element 240. The light receiving port of the photoelectric conversion device 260 is oriented correspondingly. The spot concentrating element 240 is located at the concentrating focus of the corresponding spot concentrating element 240.

Wherein, the bracket 222 includes at least two rows of the above-mentioned spot concentrating elements 240 on each side, that is, at least two sets of point concentrating element groups 242 (refer to FIG. 2). In the embodiment shown in FIG. 2, two rows of spot concentrating elements 240, that is, two sets of the above-mentioned spot concentrating element groups 242 are included. On the side of the supporting device 220, the spot concentrating element 240 adjacent to the bracket 222 constitutes the above-mentioned row of spot concentrating elements, that is, a group of point concentrating element groups 242; adjacent to the set of point concentrating element groups 242 A row of spot concentrating elements constitutes another set of spot concentrating elements (not shown).

In other embodiments, the quasi-slot point concentrating solar energy utilization device 200 may also provide one or more rows of the above-mentioned spot concentrating elements on only one side of the bracket 222.

Fig. 3 is a plan view showing the arrangement of the spot concentrating elements on the side of the stent of the embodiment shown in Fig. 2.

4 is a schematic diagram of a receiving port of the embodiment shown in FIG. 2.

Referring to FIG. 3, each of the set of spot light collecting elements 242, the adjacent spot light collecting elements 240 between each group is staggered by a predetermined distance d, and correspondingly, photoelectric conversion corresponding to the above-mentioned staggered adjacent spot light collecting elements 240 The device 260 can be disposed in the same receiving port 2222 on the bracket 222. The light receiving ports of the optoelectronic device 260 in the same receiving port 2222 are respectively directed toward the corresponding spot concentrating elements 240, and respectively located at the corresponding spot concentrating elements 240. The focus of the spotlight (refer to Figure 4). Referring to the embodiment shown in FIG. 2, by providing two rows of spot concentrating elements 240 on each side of the support device 220, using the above-mentioned one-slot-type spot concentrating solar energy utilization device 200, only one row of dots can be set on both sides. The workload of the quasi-slot concentrating solar energy utilization device 100 (refer to FIG. 1) of the optical element reduces the cost of the quasi-slot concentrating solar energy utilization device 100, and further improves the quasi-slot concentrating The solar energy utilization rate of the solar energy utilization device 100.

Specifically, the predetermined distance d may be set to different values as needed. In the present embodiment, the predetermined distance d is set to 10 mm.

In other embodiments, the number of sets of the spot concentrating element groups 242 on each side of the bracket 222 may be set, and the number of the photoelectric conversion devices 260 in the receiving port 2222 and the corresponding orientation and positional relationship may be correspondingly provided. If the number of sets is greater than 2, the adjacent spot concentrating elements 240 between each group are misaligned in one direction to ensure that adjacent points between the above groups can be accommodated in the same receiving port 2222. The photoelectric conversion device 260 corresponding to the optical element 240.

FIG. 5 is a schematic view showing the incident angle of the spot concentrating element of the embodiment shown in FIG. 2 with respect to the corresponding photoelectric conversion device.

In the embodiment shown in Figure 2, the spot concentrating element 240 is a reflective spot concentrating element. The focal length of the above-mentioned spot concentrating element 240 is 0.8 m - 1.5 m, and the incident angle of each spot concentrating element 240 with respect to the corresponding photoelectric conversion device 360 is less than 30°. Referring to FIG. 2, the above incident angle is an angle between a normal line of each spot concentrating element 240 and a corresponding incident light. Referring to FIG. 5, the incident angle on the view plane of the first row of spot concentrating elements 240 with respect to the corresponding photoelectric conversion device 260 is α, and the second row of spot concentrating elements 240 is on the view plane of the corresponding photoelectric conversion device 260. The incident angle is β, wherein the angles of α and β are all less than 30° and are substantially the same. By setting the characteristic parameters of the above-mentioned spot concentrating element, including the focal length of the spot concentrating element, and further setting the incident angle of the spot concentrating element, the utilization of solar energy can be further improved. Further, the focal spot of the above-mentioned spot concentrating element is 1 m, and the incident angle is less than 20°. The above arrangement adopts the existing GaAs photovoltaic cell product (the photoelectric conversion efficiency of the conventional GaAs photovoltaic cell is less than 40%) The actual utilization rate of solar energy is more than 25%. Considering that the efficiency of gallium arsenide multi-level photovoltaic cells exceeds 50%, the actual power generation efficiency of the system is close to 40%.

Specifically, referring to FIG. 2, the above-mentioned reflective point concentrating element is a parabolic mirror. Light-receiving area of the parabolic mirror is 0.2m ^² -0.75m ^2, the parabolic mirror incident light spot on the light receiving area of the opening for forming the photoelectric conversion device 260 is less than 35mm * 35mm, the area ratio of the incident light spot and the light receiving area is greater than 250. The above parameter setting ensures the incident light intensity of the spotlight incident spot, and the conversion efficiency of the light energy into electric energy is higher. Specifically, the light-receiving area of the parabolic mirror is 0.4 m ² , and the ratio of the focal length of the parabolic mirror to the square root of the light-receiving area is greater than 1.2 and less than 3. Specifically, the above ratio is 1.5. By setting the above ratio, the area of the incident spot that reaches the photoelectric conversion device 260 through the parabolic mirror can be made smaller, and the light intensity is more concentrated, which satisfies the ideal working range of the high-concentration photovoltaic cell.

Figure 6 is a schematic view of the photoelectric conversion device of the embodiment shown in Figure 2.

Referring to FIG. 6 and FIG. 7, the photoelectric conversion device 260 in the embodiment shown in FIG. 2 includes a plurality of photovoltaic cells 262, a plurality of thermal conductive circuit boards 264, a plurality of conductive sheets 266, a heat sink 268, a casing (not shown), and an installation. Board 269. The plurality of photovoltaic cells 262 are respectively disposed on the corresponding heat conducting circuit board 264 for converting the sunlight concentrated by the spot concentrating element 240 into electrical energy, and the heat conducting circuit board 264 is used for fixing the photovoltaic cell 262 and conducting the photovoltaic. The plurality of conductive sheets 266 are respectively disposed on the heat conducting circuit board 264, and are respectively connected to the photovoltaic cells 262 for discharging electric energy generated by the photovoltaic cells 262 to the external circuit; the heat sink 268 passes The heat pipe 267 is thermally connected to the heat conducting circuit board 264 for deriving heat energy generated when the photovoltaic cell 262 is in operation; the outer casing is for receiving The heat conducting circuit board 264, the photovoltaic cell 262, the conductive sheet 266, the heat sink 268, the mounting board 269, and the heat pipe 267 are provided with a light receiving port, and the photovoltaic cell 262 receives the sunlight concentrated by the spot concentrating element 240 through the light receiving port. The mounting plate 269 is configured to carry the plurality of photovoltaic cells 262, the plurality of thermal conductive circuit boards 264, the plurality of conductive sheets 266, and the like.

Specifically, the heat sink 268 and the heat pipe 267 constitute a heat dissipating device (not shown), the conductive sheet 266 constitutes a conductive structure (not shown), and the mounting plate 269 constitutes a supporting mechanism (not shown). By setting the characteristic parameters of the spot concentrating element 240 and the corresponding parameter data of the photoelectric conversion device 260, the heat sink, the conductive structure, the support structure, and the like, the utilization rate of the solar energy is further improved, and the manufacturing cost and the maintenance cost are reduced.

The plurality of photovoltaic cells 262 receive the sunlight concentrated by the spot concentrating element 240 through the light receiving port, and convert the energy of the received incident spot into electric energy, and pass the conductive sheet 266 connecting each photovoltaic cell 262 to the external circuit. (not shown) respectively derives the electrical energy generated by each photovoltaic cell 262; the photovoltaic cell 262 does not convert all of the light energy into electrical energy, and at the same time that the photovoltaic cell 262 converts light energy into electrical energy, part of the photovoltaic cell cannot be used by the photovoltaic cell. The converted light energy is converted into thermal energy, and the thermal conductive circuit board 264 conducts the thermal energy generated when the plurality of photovoltaic cells 262 operate, and the thermal energy is extracted by the heat sink 268. The heat sink is provided with a coolant inlet 2682 and a coolant outlet 2684, respectively connected to the heat sink for heat dissipation.

Specifically, the photovoltaic cell 262 is a multi-junction gallium arsenide photovoltaic cell. The number of the above-mentioned photovoltaic cells 262 is four, and each of the photovoltaic cells 262 is disposed on a separate heat conducting circuit board 264, and each of the heat conducting circuit boards 264 is arranged in a square matrix to form a photovoltaic battery pack (not shown). Wherein, the diagonally arranged photovoltaic cells 262 are connected in parallel with each other and connected to a protection circuit (not shown), and two sets of parallel photovoltaic cells 262 in diagonal positions are connected in series; or the above four photovoltaic cells 262 are connected in parallel and share a protection circuit. . Moreover, in the quasi-slot point concentrating solar energy utilization device 200, the photovoltaic cells 262 of the photoelectric conversion device 260 corresponding to the different spot concentrating elements 240 are connected in series with each other, so that the output voltages of the concentrating elements 240 are added. And the currents are equal, so that it is possible to transmit more power without increasing the cross-sectional area of the wires. Because the areas of the concentrating elements 240 are equal, the photovoltaic cells 262 are equally efficient. Therefore, the ideal currents generated by the photovoltaic cells corresponding to the concentrating elements 240 are equal, satisfying the series connection; the experiment proves that under the same concentrating element The sum of the currents of the diagonal photovoltaic cells 262 in the four photovoltaic cells 262 is very close to the sum of the currents of the other diagonal photovoltaic cells 262, satisfying the series conditions, if two sets of different diagonal photovoltaic cells 262 are connected in series, the voltage can be Double the current and double the current, which reduces the requirement on the cross-sectional area of the wire, saves the wire and reduces the loss on the wire.

In each of the photovoltaic cells in each of the above photoelectric conversion devices 260, each of the photovoltaic cells 262 is disposed on a separate thermally conductive circuit board 264. When one of the photovoltaic cells 262 fails, the entire photovoltaic battery pack does not need to be replaced. It is necessary to remove and replace the failed photovoltaic cell 262, which does not affect the normal operation of the other photovoltaic cells 262, facilitates the continuous use of the quasi-slot point concentrating solar energy utilization device 200, and improves the quasi-slot spot concentrating. The life of the solar energy utilization device 200.

In other embodiments, each of the photovoltaic cells 262 described above may also be in series with one another.

Specifically, the light receiving range of each of the photovoltaic cells 262 is greater than or equal to 9 mm*9 mm. When the number of the above photovoltaic cells 262 is four, the overall light receiving surface of the above photovoltaic battery pack is slightly less than 40 mm * 40 mm, and further, slightly less than 38 mm * 38 mm. Moreover, the incident spot area formed by the parabolic mirror on the light receiving port of the photoelectric conversion device is less than 35 mm*35 mm, so that the incident spot energy is stronger, so that the incident spot can completely fall within the light receiving surface of the photovoltaic cell 262 group, ensuring that Convert solar energy into electricity. In another embodiment, each of the photovoltaic cells 262 has a light receiving range of 10 mm * 10 mm.

Specifically, the width of the light receiving opening on the outer casing is greater than 60 mm, which can ensure complete exposure of the light receiving surface of the photovoltaic cell 262 group, and ensure that the incident light spot completely falls within the light receiving range of the photovoltaic cell 262 group.

Further, referring to FIG. 7, the above photoelectric conversion device further includes a secondary concentrator 265, and the secondary concentrator 265 includes a light input end (not labeled) and a light output end (not labeled), and the light input end a plurality of light incident ports (not shown) are disposed, and the light incident ports are closely spaced in a matrix, and the light output end is provided with a plurality of light output ports (not shown) corresponding to the light incident ports, each of which is The light output port optically connects the photovoltaic cell 262. The light input end of the secondary concentrator 265 receives the sunlight incident from the light receiving port, and performs secondary condensing, and the light output end emits the second condensed sunlight into the photovoltaic battery.

The sunlight reflected by the point concentrating element is not uniform, and the uneven sunlight concentrated by the point concentrating elements is further condensed by using a secondary concentrator, so that the incident spot of the incident light is smaller. More powerful, the incident light spot incident on the photovoltaic cell 262 group is relatively uniform, and the intensity of the sunlight received by the photovoltaic cell 262 per unit area is increased, thereby further improving the utilization rate of the photovoltaic cell and reducing the usage of the photovoltaic cell, thereby reducing the amount of the photovoltaic cell. cost. . Specifically, the above secondary concentrator is a transmissive secondary concentrating prism or a reflective secondary concentrating cup.

The quasi-slot point concentrating solar energy utilization device is placed on the chasing instrument when the application is applied, and the sun position is automatically tracked by the chasing instrument, so that the angle between the spot concentrating element of the quasi-slot concentrating solar energy utilization device and the sunlight is maintained. The spot concentrating elements that are constant over a range of angles, or that maintain a quasi-slot point concentrating solar energy utilization device, are facing the sun. Specifically, the angle between the actual incident light of the sun and the ideal incident light is γ, and |γ|≤0.5°.

The above dimensional chain includes the focal length of the parabolic mirror, the light receiving surface, the incident angle, the size of the incident spot, the light receiving surface of the photovoltaic cell 262, etc., and balances the limitation of the angle of the incident light by the secondary concentrator 265, and the tracking control The spot caused by the error is affected by the sloshing of the light receiving area. The photovoltaic cell 262 is ideally subjected to the light intensity. The photovoltaic cell 262 is limited in the ability to withstand the received light intensity when the extreme light is uneven. The wire cross-section size limits the current intensity, and the wire hardness is The influence of the circuit board, the series boosting limit condition, the photovoltaic cell 262 is discharged one by one, the space size and arrangement of the heat sink 268, the heat conduction performance of the heat sink 268, the photovoltaic cell 262 are independently replaced, and the processing precision of the spot concentrating element 240 is allowed. The point concentrating element 240 has the convenience of installation, the convenience of cleaning the spot concentrating element 240, the influence of the wind pressure on the chasing instrument, the cost of the system is as low as possible, and the like.

The above described embodiments merely express several embodiments of the present invention, the description of which is more specific and detailed, but does not Therefore, it is understood that the scope of the invention is limited. It should be noted that a number of variations and modifications may be made by those skilled in the art without departing from the spirit and scope of the invention. Therefore, the scope of the invention should be determined by the appended claims.

Claims

A quasi-slot point concentrating solar energy utilization device, comprising:

The supporting device comprises a bracket and a base, and the base is symmetrically distributed on two sides of the bracket;

a plurality of spot concentrating elements are symmetrically distributed on the bases on both sides of the bracket to form a quasi-slot structure for receiving and collecting sunlight;

a plurality of photoelectric conversion devices are located at an end of the bracket opposite to the base, the photoelectric conversion device is equal in number to the spot concentrating elements and corresponds to the point concentrating elements, and the photoelectric conversion device The light receiving port faces the corresponding point concentrating element and is located at the concentrating focus of the corresponding point concentrating element; the sunlight for concentrating the point concentrating element is converted into electric energy.
The quasi-slot point concentrating solar energy utilization device according to claim 1, wherein the point concentrating element is a reflective point concentrating element, and the focal length of the point concentrating element is 0.8m-1.5m. The incident angle of each of the spot concentrating elements relative to the corresponding photoelectric conversion device is less than 30°.
The quasi-slot point concentrating solar energy utilization device according to claim 1, wherein the point concentrating element is a parabolic mirror.
The quasi-slot point concentrating solar energy utilization device according to claim 3, wherein the parabolic mirror has a light receiving area of 0.2 m 2 to 0.75 m 2 , and the parabolic mirror is in the photoelectric conversion device The area of the incident spot formed by the light receiving port is less than 35 mm * 35 mm, and the ratio of the area of the light receiving area to the area of the incident spot is greater than 250.
The quasi-slot point concentrating solar energy utilization device according to claim 4, wherein a ratio of a focal length of the parabolic mirror to a square root of the light receiving area is greater than 1.2 and less than 3.
The quasi-slot point concentrating solar energy utilization device according to claim 1, wherein the photoelectric conversion device comprises:

a plurality of photovoltaic cells are respectively disposed on the heat conducting circuit board for converting sunlight concentrated by the point concentrating elements into electrical energy;

a plurality of the heat conducting circuit boards for respectively fixing each of the photovoltaic cells and conducting heat energy generated when the photovoltaic cells operate;

a plurality of conductive sheets respectively disposed on the heat conducting circuit board and respectively connected to the photovoltaic cells for deriving electrical energy generated by the photovoltaic cells to an external circuit;

a heat sink connected to the thermal circuit board for deriving thermal energy generated when the photovoltaic cell is in operation;

The outer casing is configured to receive the photovoltaic cell, the thermal conductive circuit board, the conductive sheet and the heat sink, and is provided with a light receiving port, and the photovoltaic cell receives the sunlight concentrated by the point concentrating element through the light receiving port.
The quasi-slot point concentrating solar energy utilization device according to claim 6, wherein the photovoltaic cells are multi-junction gallium arsenide photovoltaic cells, and each of the photovoltaic cells has a light receiving range of 9 mm*9 mm or more.
The quasi-slot point concentrating solar energy utilization device according to claim 6, wherein the number of the photovoltaic cells is four, and the photovoltaic cells are arranged in a square matrix; wherein the photovoltaic cells are arranged diagonally Connected to each other in parallel and connected to the protection circuit.
The quasi-slot point concentrating solar energy utilization device according to claim 8, wherein the photovoltaic cells of the photoelectric conversion device corresponding to the different spot concentrating elements are connected in series with each other.
The quasi-slot point concentrating solar energy utilization device according to claim 6, wherein the photoelectric conversion device further comprises a secondary concentrator, the secondary concentrator comprising a light input end and a light output end; a plurality of light incident ports are disposed at the light input end, and the plurality of light incident ports are densely arranged in a matrix, and the light output end is provided with a plurality of light output ports corresponding to the light incident ports, the light output The port is optically connected to the photovoltaic cell; the secondary concentrator performs secondary concentrating of sunlight incident from the light receiving port and injects the secondary condensed sunlight into the photovoltaic cell.