KR101856701B1 - Solar Cell Unit for Photovoltaic Power Generation - Google Patents

Solar Cell Unit for Photovoltaic Power Generation Download PDF

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KR101856701B1
KR101856701B1 KR1020160099422A KR20160099422A KR101856701B1 KR 101856701 B1 KR101856701 B1 KR 101856701B1 KR 1020160099422 A KR1020160099422 A KR 1020160099422A KR 20160099422 A KR20160099422 A KR 20160099422A KR 101856701 B1 KR101856701 B1 KR 101856701B1
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solar cell
power generation
guide
ellipsoid
solar
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KR1020160099422A
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Korean (ko)
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KR20170125689A (en
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임채영
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임채영
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02S—GENERATION OF ELECTRIC POWER BY CONVERSION OF INFRARED RADIATION, VISIBLE LIGHT OR ULTRAVIOLET LIGHT, e.g. USING PHOTOVOLTAIC [PV] MODULES
    • H02S40/00—Components or accessories in combination with PV modules, not provided for in groups H02S10/00 - H02S30/00
    • H02S40/20—Optical components
    • H02S40/22—Light-reflecting or light-concentrating means
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B3/00—Simple or compound lenses
    • G02B3/02—Simple or compound lenses with non-spherical faces
    • G02B3/08—Simple or compound lenses with non-spherical faces with discontinuous faces, e.g. Fresnel lens
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0013—Means for improving the coupling-in of light from the light source into the light guide
    • G02B6/0015—Means for improving the coupling-in of light from the light source into the light guide provided on the surface of the light guide or in the bulk of it
    • G02B6/002—Means for improving the coupling-in of light from the light source into the light guide provided on the surface of the light guide or in the bulk of it by shaping at least a portion of the light guide, e.g. with collimating, focussing or diverging surfaces
    • G02B6/0021—Means for improving the coupling-in of light from the light source into the light guide provided on the surface of the light guide or in the bulk of it by shaping at least a portion of the light guide, e.g. with collimating, focussing or diverging surfaces for housing at least a part of the light source, e.g. by forming holes or recesses
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L31/00—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
    • H01L31/04—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof adapted as photovoltaic [PV] conversion devices
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02S—GENERATION OF ELECTRIC POWER BY CONVERSION OF INFRARED RADIATION, VISIBLE LIGHT OR ULTRAVIOLET LIGHT, e.g. USING PHOTOVOLTAIC [PV] MODULES
    • H02S20/00—Supporting structures for PV modules
    • H02S20/10—Supporting structures directly fixed to the ground
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/50—Photovoltaic [PV] energy
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/50—Photovoltaic [PV] energy
    • Y02E10/52—PV systems with concentrators

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Condensed Matter Physics & Semiconductors (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Hardware Design (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Power Engineering (AREA)
  • Photovoltaic Devices (AREA)

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a solar cell unit for solar power generation capable of improving light collection efficiency and power generation efficiency. The present invention relates to an image forming apparatus comprising a body having an upper portion having a plurality of through holes and a lower portion connected to the upper portion, the inner portion of the upper portion and the inner portion of the lower portion forming an ellipsoid, A solar cell positioned at an apex of a long axis of the ellipsoid; And a plurality of guide holes communicating with the through holes of the upper portion and decreasing in diameter from the outer side to the inner side, wherein the guide holes include a guide for reflecting mirror processing, and sunlight is transmitted through the guide holes, And the incident sunlight is repeatedly reflected by the inside of the body to be converged into the solar cell.

Figure 112016075892620-pat00004

Description

[0001] Solar Cell Unit for Photovoltaic Power Generation [0002]

The present invention relates to a photovoltaic unit for photovoltaic power generation, and more particularly, to a photovoltaic unit for photovoltaic power generation capable of improving light collection efficiency and power generation efficiency.

Recently, various environmental regulations such as the Convention on Climate Change have been strengthened around the world. In addition, fossil fuels such as petroleum and coal are finite resources, so they become depleted over time. Therefore, development of new energy sources that are sustainable and environmentally friendly is required. For example, the use of renewable energy such as solar energy, geothermal energy, wind power, and tidal power has been developed, among which solar energy is one of the most promising alternative energy sources because it can be continuously used without generating pollution . Solar power generation is a PV system.

Referring to FIG. 1, a photovoltaic power generation system will be schematically described as follows. Solar power generation system can be divided into stand-alone system (Stand Alone System) and grid-connected system (hereinafter, referred to as grid-connected system).

Generally, a stand-alone solar power generation system is comprised of a solar cell array 20, a power controller 4, an inverter 6 and a battery 9. [ The solar cell array 20 converts sunlight into electric energy, and the power controller 4 controls electricity generated in the solar cell array 20 to output stable electricity. Electricity generated in the solar cell array 20 is DC, and inverter 6 converts DC into AC. That is, the direct current is converted into AC in the inverter 6 and supplied to the load 8 such as a lamp. In a stand-alone photovoltaic power generation system, it is common to include a battery 9 for storing extra electricity. On the other hand, the grid connection system is a combination of solar power generation and other types of power generation, and therefore, batteries are generally not used. Grid-connected systems are also the same in that they convert solar energy into electrical energy in solar cell arrays.

As described above, the portion that converts sunlight to electrical energy is the solar cell array 20, and thus the solar cell array 20 is an important part of the solar power generation system. The solar cell array 20 will be described in detail as follows. The solar cell 23 primarily converts the sunlight into electric energy. However, since the output voltage of the solar cell 23 is very low, a solar module (solar module) 21 is formed by assembling a plurality of solar cells 23 in series on one panel. And a solar cell array 20 in which the solar cell modules 21 are connected in series and in parallel.

As described above, the solar cell 23 converts solar light into electric energy, and thus, it is very important to efficiently convert sunlight into electric energy in the solar cell 23. For this purpose, it is effective to concentrate the sunlight to the solar cell 23, and it is also effective to make the solar light enter the solar cell 23 vertically as much as possible. Therefore, a concentrated photovoltaic generation (concentrating photovoltaic generation) in which sunlight is concentrated to the solar cell 23 using a reflector or a lens has been proposed. Centralized solar power includes a centralized solar cell unit.

Referring to FIG. 2, an example of the centralized solar power generation will be described below.

The centralized solar cell unit 30 includes a parabolic reflector 25 and a solar cell 23 located at the focal point of the parabola of the parabolic reflector 25. [ The sunlight S incident in parallel to the parabolic reflector 25 is optically gathered at the focus of the parabola. Therefore, the sunlight incident parallel to the parabolic reflector 25 is focused on the solar cell 23 located at the focus of the parabola.

3, another example of the centralized solar power generation will be described.

Another example of the centralized solar cell unit 30a includes a Fresnel lens 25a and a solar cell 23a located at the focal point of the Fresnel lens 25a. The sunlight incident in parallel to the Fresnel lens 25a optically converges at the focal point of the Fresnel lens 25a. Therefore, the sunlight incident parallel to the Fresnel lens 25a is focused on the solar cell 23a located at the focal point of the Fresnel lens 25a.

As described above, there has been proposed a convergent solar power generation system in which sunlight is concentrated to the solar cells 23 and 23a using a reflector or a lens. However, in order to increase energy conversion efficiency even in this power generation system, It is important to direct the sun, that is, to make the angle of incidence of sunlight normal to the reflector or lens. This is because the concentrated solar power eventually concentrates the sunlight entering the reflector or the lens in parallel to the solar cell using a reflector or a lens.

However, in a stationary solar power generation system in which the solar cell module is fixedly mounted on the ground, the incidence angle of the sunlight can not be made normal to the solar cell, the reflector, or the lens. This is because the position of the sun constantly changes with the passage of time. Therefore, in order to make the concentrated solar power generation more efficient, a tracking type solar power generation system has been proposed in which the position of the solar cell module is changed according to the change of the position of the sun. In the tracking type photovoltaic power generation system, a tracker is used which grasps the orbit of the sun and changes the position of the solar cell module so that the sunlight always enters the solar cell, the reflector, or the lens perpendicularly. This tracking type solar power generation can enhance the light collection efficiency compared with the fixed type solar power generation. However, in tracking type solar power generation, a tracker must be used unlike fixed type solar power generation. Incidentally, the tracker includes a sensor for detecting the position of the sun, a drive unit for moving the solar array, and the like, so that the apparatus is complex. In addition, the tracker has a complicated device, and accordingly, it is disadvantageous that the device is liable to be defective in a harsh environment such as a desert or a subtropical region depending on a place of installation. Trackers are also relatively expensive equipment. Therefore, development of a photovoltaic power generation system that is low in cost and high in power generation efficiency is required.

SUMMARY OF THE INVENTION The present invention provides a solar cell unit for solar power generation capable of improving light collection efficiency and power generation efficiency.

According to one embodiment of the present invention, there is provided an image forming apparatus including an upper portion having a plurality of through holes and a lower portion connected to the upper portion, wherein the inside of the upper portion and the inside of the lower portion constitute an ellipsoid, A body to be treated; A solar cell positioned at an apex of a long axis of the ellipsoid; And a plurality of guide holes communicating with the through holes of the upper portion and decreasing in diameter from the outer side to the inner side, wherein the guide holes include a guide for reflecting mirror processing, and sunlight is transmitted through the guide holes, And the incident sunlight is repeatedly reflected by the inside of the body to be converged into the solar cell.

It is preferable that a band-shaped solar cell band is further provided inside the body corresponding to the focus of the ellipsoid. It is preferable that a Fresnel lens or a convex lens is provided at the entrance of the guide hole.

The guide may comprise an ellipsoid. The lower portion of the body may be embedded in the ground.

According to another aspect of the present invention, there is provided a solar battery comprising: a solar cell for converting solar energy into electric energy; And a plurality of guide holes communicating with the solar cell, the diameter of which is reduced from the outside to the inside, and the inside of the guide hole includes a guide for reflecting mirror processing, and sunlight is reflected inside the guide holes repeatedly A solar cell unit for solar power generation converged by the solar cell is provided.

It is preferable that a Fresnel lens or a convex lens is provided at the entrance of the guide hole. In addition, the guide may be formed of an ellipsoid.

According to another aspect of the present invention, there is provided a solar cell module comprising: a plurality of solar cells for converting solar energy into electric energy; And a plurality of guide holes corresponding to the plurality of solar cells, the guide holes having a diameter reduced from the outside to the inside in communication with the solar cell, wherein the inside of the guide hole includes a guide for reflecting mirror processing, The solar cell unit for solar photovoltaic power generation converges into the solar cell corresponding to the plurality of guide holes while reflecting in the guide hole of the guide hole.

It is preferable that a Fresnel lens or a convex lens is provided at the entrance of the guide hole. It is preferable that the guide is formed in a flat shape.

According to another aspect of the present invention, there is provided an image forming apparatus having an upper portion having a plurality of through holes and a lower portion connected to the upper portion, wherein the inside of the upper portion and the inside of the lower portion constitute an ellipsoid, A body to be mirror-polished; A solar cell positioned at an apex of a long axis of the ellipsoid; A guide having a plurality of guide holes communicating with the through holes of the upper portion and decreasing in diameter from the outside to the inside; And a lens provided at an entrance of the guide hole, wherein sunlight is incident on the inside of the body through the lens, the guide hole and the through hole, and the incident sunlight repeats reflection in the interior of the body, A solar cell unit for solar photovoltaic generation converges into a battery.

According to another aspect of the present invention, there is provided a solar cell comprising: a solar cell for converting solar energy into electric energy; A guide having a plurality of guide holes communicating with the solar cell and decreasing in diameter from the outside to the inside; And a lens provided at an entrance of the guide hole, wherein solar light is guided to the solar cell by the lens.

According to another aspect of the present invention, there is provided a solar cell module comprising: a plurality of solar cells for converting solar energy into electric energy; A guide corresponding to the plurality of solar cells, the guide having a plurality of guide holes communicating with the solar cell and decreasing in diameter from the outside to the inside; And a lens provided at an entrance of the guide hole, wherein the solar light is guided to the lens by the solar cell.

According to another aspect of the present invention, there is provided a solar cell comprising: a solar cell for converting solar energy into electric energy; And a plurality of lenses, each of the plurality of lenses having a focal point converging to a position where the solar cell is installed, the plurality of lenses And the solar light incident on the solar cell is guided to the solar cell by the plurality of lenses, respectively. It is preferable that the lens is one of a Fresnel lens and a convex lens. The guide is preferably hemispherical.

On the other hand, the lens is preferably polygonal. In addition, it is preferable that the lens is provided in a honeycomb form.

According to still another aspect of the present invention, there is provided an imaging apparatus comprising: at least two guides provided in a band shape having a predetermined curvature and having a plurality of lenses converging to one focus; And at least two solar cells installed at focal points of the lens of the guide, wherein the sunlight incident on each of the plurality of guides is guided by the solar cells of the plurality of guides, respectively, Thereby providing a battery unit. It is preferable that the lens is one of a Fresnel lens and a convex lens.

Meanwhile, it is preferable that the guide is installed with a predetermined inclination.

The solar cell unit for solar power generation according to the present invention has the following effects.

First, according to the present invention, there is an advantage that the structure is simple and the light-condensing efficiency and the power generation efficiency can be improved.

Second, according to the present invention, there is an advantage that the light collection efficiency and the power generation efficiency can be effectively improved even at a relatively low cost.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram schematically showing a configuration of a general solar power generation system;
FIG. 2 is a cross-sectional view schematically showing a conventional solar cell unit of a centralized solar cell
3 is a cross-sectional view schematically showing a solar cell unit of another example of a conventional centralized solar cell
4 is a perspective view schematically showing an embodiment of a solar cell unit for photovoltaic power generation according to the present invention.
5 is a cross-
Fig. 6 is a cross-sectional view showing an enlarged portion of the sunlight incident on Fig. 5
7 is a conceptual diagram illustrating the principle of a solar cell unit for solar power generation according to the present invention.
8 is a cross-sectional view schematically showing another embodiment of the solar cell unit for photovoltaic power generation according to the present invention
9 is a cross-sectional view schematically showing another embodiment of the solar cell unit for photovoltaic power generation according to the present invention
10 is a cross-sectional view schematically showing still another embodiment of the solar cell unit for photovoltaic power generation according to the present invention
11 is a perspective view schematically showing another embodiment of the solar cell unit for photovoltaic power generation according to the present invention.
12 is a cross-
13 is a perspective view schematically showing another embodiment of the solar cell unit for solar power generation according to the present invention.
14 is a side view of Fig. 13

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of a solar cell unit for solar power generation according to the present invention will be described with reference to the accompanying drawings. Hereinafter, the components and the like of the present invention will be described in detail with reference to the drawings and examples, but these are only used to facilitate understanding of the present invention. Also, in the following embodiments, specific elements may be exaggeratedly shown or described for convenience of explanation, but this is also intended to facilitate understanding of the present invention. Therefore, it is intended that the present invention not be limited to the embodiments described below, and that various modifications and changes may be made thereto by those skilled in the art to which the present invention pertains, to be.

Referring to Figs. 4 and 5, a preferred embodiment of a solar cell unit for photovoltaic power generation according to the present invention will be described.

The photovoltaic solar cell unit 1 preferably includes a body 300 and a guide 500 surrounding the body 300. It is preferable that the inner surface of the body 300 constitutes an ellipsoid P as a whole. And a solar cell 410 for converting solar energy into electric energy. The solar cell 410 is preferably positioned at a predetermined position of the body 300, that is, the vertex C2 of the long axis Y of the ellipsoid P constituted by the body 300. [ Further, it is preferable to further include a solar cell band 420 having a strip shape and having a plurality of solar cells. The solar cell band 420 is preferably provided in the form of a band at an inner surface position portion of the body 300 substantially corresponding to the second focus F2 of the ellipsoid.

Each component will be described in detail as follows.

The body 300 includes an upper portion 310 having a plurality of through holes 312 and a lower portion 320 connected to the upper portion of the body 300. The inner portion 314 of the body 300 includes a reflector Processing. Basically, the body 300 is configured to reflect sunlight incident inside the body 300.

It is preferable that the inside of the upper portion 310 of the body 300 and the inside of the lower portion 320 of the body 300 together constitute the ellipsoid P. [ The ellipsoid (P) forms a hollow revolving body formed by rotating 360 degrees about the major axis (Y) of the ellipsoid. Since the ellipsoid (P) is a rotating body having one ellipse turned around the major axis, all the cross sections of the rotating body are elliptical, and the focus of the ellipse is the same.

The inner surface of the upper portion 310 of the body 300 and the inner surface of the lower portion 320 may be combined to form one ellipsoid P as described above. The size of the upper portion 310 and the lower portion 320 of the body 300 may be appropriately determined in consideration of condensing efficiency and the like. For example, the upper portion 310 and the lower portion 320 of the body 300 may form half of the ellipsoid P, respectively. The body 300 may be embedded in the ground G of the lower portion 320.

On the other hand, the solar cell 410 is provided at the vertex C2 of the long axis Y of the ellipsoid P. And a solar cell band 420 is provided at a portion corresponding to the second focus F2 of the ellipsoid P. [ It is preferable that the solar cell band 420 is provided at a portion where the second focus F2 of the ellipsoid is projected to the outside of the body 300 to meet with the body 300, that is, a belt-shaped portion. The reason why the solar cell band 420 is provided at this portion is that a part of light that does not converge to the long axis Y converges on this portion of the ellipsoid P as a result of simulation. The solar cell band 420 preferably includes a plurality of solar cells. The solar cell 410 and the solar cell band 420 may be supported by a predetermined support member or may be installed directly on the body 300.

The guide 500 preferably covers a predetermined portion of the body 300, for example, the upper portion 310. Although the shape of the guide 500 is not limited, it is preferable that the shape corresponding to the body 300 is an ellipsoid Do. It is preferable that the size of the guide 500 is appropriately selected in consideration of condensing efficiency and the like. For example, the width of the guide 300 (corresponding to the length of the guide hole 510) may be substantially similar to the width of the body 300 in the minor axis direction. The guide 500 includes a plurality of guide holes 510 through which sunlight flows into the body 300.

Referring to FIG. 6, the guide hole 510 will be described in detail.

The guide hole 510 is generally conical in shape and preferably has a smaller diameter going from the inlet 514 to the outlet 512. The shape of the guide hole 510 is not limited to a cylindrical shape (see FIG. 4A). In order to reduce the space between the guide hole 510 and the neighboring guide hole 510, (See Fig. 4 (b)). The cross-sectional shape from the inlet 514 to the outlet 512 of the guide hole 510 can also be configured differently.

It is preferable that the inside 516 of the guide hole 510 is mirror-finished. The inlet 514 of the guide hole 510 communicates with the outside of the guide hole 510 to receive sunlight and an outlet 512 of the guide hole 510 communicates with the through hole 312 of the body 300 ). The sunlight is incident on the entrance 514 of the guide hole 510 and proceeds inward of the guide hole 510 while reflecting on the inner surface 516 of the guide hole 510. As a result, And enters the inside of the body 300 through the outlet 512 of the hole 510 and the through hole 312 of the body 300.

It is preferable that the plurality of guide holes 510 are disposed to face the focal points F1 and F2 of the ellipsoid P. [ For example, it is preferable that the axes P1, P2, and P3 of the guide hole 510 are disposed so as to face the focal points F1 and F2 of the ellipsoid P, respectively. This is because when the sunlight is incident on the focal points F1 and F2 of the ellipsoid P, the incident sunlight repeats reflection inside the body 300 and eventually reaches the vertex Y of the ellipsoid P And converges to the solar cell 410 provided in the photovoltaic device C2. That is, in this embodiment, light incident into the ellipsoid P is reflected inside the ellipsoid P and guided to the solar cell 410. The guiding hole 510 is formed in the center of the ellipsoid P in such a manner that the light is guided to the solar cell 410 while the light is reflected many times inside the ellipsoid P by using the optical property of the ellipsoid P. (F1, F2). For example, the guide hole 510 located at the upper portion of the first focus F1 can be disposed to face the first focus F1, and the guide hole 510 positioned at the lower portion of the first focus F1 510 may be oriented toward the second focus F2.

On the other hand, the shape, number, length, size, and the like of the guide hole 510 are preferably determined in terms of light condensing efficiency and the like. This is because as the guide hole 510 occupies most of the guide 500, the amount of the tacky light incident on the body 300 increases. Therefore, it is preferable that the guide hole 510 occupies most of the guide 500. For example, the guide hole 510 may be formed in a polygonal shape rather than a circular shape. When the guide 500 is viewed from the outside, the entrance 514 of the guide hole 510 may be formed in a honeycomb shape or a soccer ball shape . In this case, the boundary 510a between the guide holes 510, which may be generated when the entrance of the guide hole 510 is circular, can be substantially eliminated, so that almost all the sunlight is guided into the guide hole 510 Can enter. (See Fig. 4 (b)).

Since the sunlight incident on the guide hole 510 is reflected by the inner surface of the guide hole 510 and the incident angle and the reflection angle are equal to each other, And the light incident on the body 300 passes through the And finally converges to the solar cell 410 while repeating reflection inside the body 300. [

On the other hand, the diameter of the outlet 512 of the guide hole 510 is preferably as small as possible. This is because as the diameter of the exit 512 of the guide hole 510 is smaller, the sunlight incident on the body 300 is reflected by the inner surface of the body 300 and does not go out through the guide hole 510 to be. When the diameter of the outlet 512 of the guide hole 510 is minimized and the through hole 312 of the body 300 is minimized as well, the area of light reflected from the inner surface of the body 300 is increased, Do. This is because the portion of the inner surface of the body 300 excluding the through hole 312 serves as a reflector.

Referring to FIG. 7, the principle of operation of converging solar light into the solar cell 410 while reflecting sunlight inside the ellipsoid P will be described as follows. The sunlight S incident on the focuses F1 and F2 of the ellipse repeatedly reflects in the interior of the ellipsoid P will eventually cause the long axis Y of the ellipsoid P to become . The solar light S incident on the second focus F2 will be described by way of example.

The sunlight S and L1 incident on the focus (second focus) F2 of the ellipsoid P are incident on another focus (first focus) F1 after being reflected by the inner surface of the ellipsoid P. (Refer to L 2) The sunlight L 2 incident on the first focal point of the ellipsoid is reflected on the inner surface of the ellipsoid and then incident on the second focal point F 2 again (see L 3). And eventually converges to the long axis Y of the ellipsoid P. [ In this embodiment, however, the solar cell 410 is provided at the vertex C 2 of the long axis P of the ellipsoid P. Therefore, the sunlight incident on the first focus F1 or the second focus F2 of the ellipsoid P repeatedly reflects in the inside of the ellipsoid P and is eventually collected in the solar cell 410. [ When the size of the ellipsoid P or the size of the solar cell 410 is appropriately adjusted, light can be converged to the solar cell 410 after a small number of reflections, for example, approximately 4-5 times depending on the position of the focal point.

The sunlight entering near the focuses F1 and F2 of the ellipsoid P also follows the long axis Y of the ellipsoid P while repeating reflection in the ellipsoid P as well. This is because the incident light at the non-focal point of the ellipsoid P has the same incident angle and the same reflection angle at the reflective surface. Therefore, if the reflection is repeated inside the ellipsoid, the light is gradually oriented in the focusing direction, (Y). On the other hand, sunlight incident in parallel with the long axis Y of the ellipsoid P can obtain similar results. This is because the incidence angle and the reflection angle are the same in the case of the sunlight incident parallel to the long axis Y of the ellipsoid P and therefore the sunlight incident on the long axis Y of the ellipsoid P in parallel Substantially coincides with the long axis Y of the ellipsoid P. [ The sunlight other than the sunlight incident on the short axis X of the ellipsoid P is mostly incident on the solar cell 410 located at the vertex C2 of the long axis Y of the ellipsoid P, Convergence. As a result of simulation, most of the light converges to the solar cell 410, and some of the light that has not converged to the solar cell 410 converges to the solar cell band 420.

As described above, in the solar cell unit 100 according to the present embodiment, sunlight is incident on the ellipsoid P, incident solar light is reflected inside the ellipsoid P, As shown in Fig. Therefore, theoretically, it is most preferable that the light incident on the inside of the ellipsoid P can be totally reflected inside without externally retransmitting. However, a part of the light incident on the inside of the ellipsoid P goes out to the outside, and the light collecting efficiency is increased even if only a part of the light is reflected inside the ellipsoid P. This is because, if at least a part of the light incident on the inside of the ellipsoid P is reflected to the inside of the ellipsoid without being re-transmitted to the outside, and is directed toward the solar cell, the light collection efficiency is improved. Therefore, it is preferable to prevent light incident on the inside of the ellipsoid from returning to the outside as much as possible. Thus, for example, it is preferable to make the size of the through hole 312 of the body 300 as small as possible.

In addition, in the conventional stationary photovoltaic power generation, photovoltaic power generation is substantially performed only for a period of time when the sunlight is vertically incident on the solar cell. When the sunlight inclines to the solar cell, almost no photovoltaic power generation occurs. Actually, sunlight used for solar power generation is only about 3.5 hours a day, depending on the region. In this embodiment, however, even when the sunlight inclines to the solar cell, the sunlight is generated irrespective of the orbit of the sun because the solar cell repeatedly reflects from the inside of the ellipsoid repeatedly. An effect of extending is generated. Therefore, even if all of the sunlight incident on the ellipsoid P does not reflect inside the ellipsoid P, the generation of sunlight reflected at the inside of the ellipsoid P is increased at least.

Therefore, according to this embodiment, there is an advantage that the power generation efficiency can be improved at almost the same cost as the fixed solar power generation. Of course, conventional tracking solar power generation may provide more effective solar power generation, but as described in the prior art, tracking solar power requires the use of a tracker, which requires complex equipment and a significant increase in cost. Therefore, according to the present invention, the power generation efficiency can be improved at least as compared with the fixed solar power generation without using the tracker.

Meanwhile, the solar cell unit for photovoltaic power generation according to the present embodiment can fix the mounting position, not the position, according to the position of the sun. However, it is preferable that the fixed installation position is provided so as to correspond to the position of the sun in the time zone in which the incident amount is the greatest. For example, in the mid-latitude region, it can be installed in the South Pacific.

In other words, according to the embodiment of the present invention, the position of the solar cell unit 1 for the solar power generation is fixedly installed, and even if the position of the sun is changed and sunlight is incident in any direction Reflection is repeated, and consequently, the light is gathered in the solar cell. Therefore, the solar light generation time is prolonged, and consequently, the light collection efficiency and the power generation efficiency are improved. Therefore, according to the solar cell unit for solar power generation according to the present invention, it is possible to improve the light-condensing efficiency and the power generation efficiency without using an expensive tracker.

In the present embodiment, light is incident into the ellipsoid P through the guide hole 510 of the guide 500. Therefore, theoretically, compared to the case where the guide 500 having no guide hole 510 is not provided The incident amount incident on the inside of the ellipsoid P may become small. However, the shape of the guide hole 510 can be optimized to substantially eliminate the difference. (See Fig. 4 (b). Further, even if the light incident on the inside of the body 300 becomes relatively small, The light incident on the body 300 can be incident on the solar cell regardless of the orbit of the sun because the light reflected by the body 300 is repeatedly reflected by the solar cell. Therefore, it has an effect of improving the photovoltaic power generation time, and consequently, the light collection efficiency and the power generation efficiency can be improved.

8, another embodiment of the solar cell unit for photovoltaic power generation according to the present invention will be described.

The present embodiment is similar to the above-described embodiment in working principle. However, in this embodiment, a predetermined lens is provided at the entrance of the guide hole 510 of the guide 500 to guide the sunlight to the inside of the body 300 more efficiently. For example, at the entrance of the guide hole 510, a Fresnel lens 550 is provided. The sunlight incident on the guide hole 510 is focused by the Fresnel lens 550 at the focal point F3 of the Fresnel lens 550. [ Therefore, when the through hole 312 of the body 300 is positioned substantially at the focal point F3 of the Fresnel lens 550, sunlight can be guided more efficiently into the inside of the body 300. [ It is also possible to use a convex lens instead of the Fresnel lens 550.

In this embodiment, since the sunlight incident on the guide hole 510 is guided to the through hole 312 of the body 300 by the Fresnel lens 550, the inside 516 of the guide hole 510, It is not necessary to perform the reflector treatment. In addition, since the Fresnel lens 550 covers the guide hole 510, dust or the like can be prevented from being introduced into the guide hole 510.

Referring to Fig. 9, another embodiment of the solar cell unit for photovoltaic power generation according to the present invention will be described.

The present embodiment is similar to the above-described embodiment in working principle. However, in this embodiment, the sunlight is directly guided to the solar cell using a guide without using a body.

The guide 600 is installed to surround the solar cell 410. The guide holes 610 of the guide 600 are provided so as to face the solar cell 410, respectively. The shape of the guide 600 is not limited, but is preferably substantially ellipsoidal. Since the structure of the guide hole 610 is the same as that of the above-described embodiment, detailed description is omitted.

According to the present embodiment, the sunlight incident on the guide hole 610 is finally converged on the solar cell 410 while repeating reflection on the inner surface of the guide hole 610. In detail, when the sunlight incident on the guide hole 610 is reflected by the inner surface of the guide hole 610, the incident angle and the reflection angle are the same. Therefore, And eventually converge on the solar cell 410. In this case,

On the other hand, also in this embodiment, a Fresnel lens or a convex lens can be further provided on the entrance side of the guide hole 610. [ In this case, the inner surface of the guide hole 610 may not be mirror-polished.

10, another embodiment of the solar cell unit for photovoltaic power generation according to the present invention will be described.

The present embodiment is similar to the above-described embodiment in working principle. In this embodiment, however, a plurality of solar cells 410a, 410b and 410c are used, and guide holes 710a, 710b and 710c corresponding to the plurality of solar cells 410a, 410b and 410c are used do. Therefore, the guide 700 having the guide holes 710a, 710b, and 710c can be provided in a flat shape.

According to this embodiment, the sunlight incident on each of the guide holes 710a, 710b, and 710c is reflected by the inner surfaces of the guide holes 710a, 710b, and 710c, , And 710c of the solar cells 410a, 410b, and 410c. In this embodiment, when the sunlight incident on the guide holes 710a, 710b and 710c is reflected by the inner surfaces of the guide holes 710a, 710b and 710c, since the incident angle and the reflection angle are the same, 710b, and 710c without going out of the solar cells 410a, 410b, and 410c, and eventually converge on the solar cells 410a, 410b, and 410c. On the other hand, also in this embodiment, a Fresnel lens or a convex lens can be further provided on the entrance side of the guide holes 710a, 710b, and 710c. In this case, the inner surfaces of the guide holes 710a, 710b, and 710c may not be mirror-polished.

In the photovoltaic unit for photovoltaic power generation according to the above-described embodiment (the embodiment of Figs. 9 and 10), the installation position can be fixed instead of changing the position according to the sun position.

While the inner shape of the body 300 is an ellipsoid in the above-described embodiment, the present invention is not limited thereto. For example, even in a non-ellipsoid shape, almost all light can be incident on the body through the guide hole, and the light incident on the body can be reflected inside the body to converge on the solar cell.

Another embodiment of the solar cell unit for photovoltaic power generation according to the present invention will be described with reference to Figs. 11 and 12. Fig.

Unlike the above-described embodiment, this embodiment does not use a body that is an ellipsoid. That is, in this embodiment, the guide is provided with a plurality of lenses, and incident solar light is guided to the solar cell by the lens. The details will be described below.

A guide 800 is provided to surround the solar cell 890. The shape of the guide 800 is not limited to a specific shape and may be any shape as long as it surrounds the solar cell 890 at a predetermined distance, but is preferably hemispherical. The guide 800 is provided with a plurality of lenses 810. A plurality of lenses 810 are provided to converge sunlight to the solar cell 890. For example, the lens 810 may be composed of a Fresnel lens or a convex lens. The focal point FL of the lens 810 substantially coincides with the position where the solar cell 890 is installed so that solar light passing through the lens 810 can be collected by the solar cell 890.

Meanwhile, it is desirable that the shape, number and size of the lens 810 and the shape and size of the guide 800 are determined in terms of light condensing efficiency and the like. For example, it is preferable that the shape, number, size, etc. of the lens 810 are determined such that the focus of all the lenses is concentrated in one place, that is, where the solar cell 890 is installed. Because, in this configuration, sunlight coming in all directions always converges to the designed focus, that is, where the solar cell 890 is installed. Therefore, depending on the position of the sun, the light condensation by any one of the plurality of lenses results in the highest light condensation, and the other lens can obtain the light condensation that assists the condensation, thereby enabling effective condensation without the tracker.

In addition, it is preferable that the lens 810 occupies a large portion of the guide 800. For example, when the guide 800 is viewed from the outside, the lens 800 may have a honeycomb shape or a soccer ball shape. With such a configuration, the boundary between the lenses 810 can be substantially eliminated, and therefore, almost all the sunlight can be converged to the place where the solar cell 890 is installed. It is preferable to appropriately select the shape and size of the guide 800 in consideration of the light condensing efficiency and the like.

On the other hand, it is preferable that a small small lens 850 composed of hemispherical or semi-elliptic glass is provided on the upper part of the solar cell 890. The focal point FL of the lens 810 provided in the guide 800 may be positioned in the vicinity of the focal point FL of the miniature lens 850 rather than being directly disposed in the solar cell 890 in order to prevent the solar cell 890 from being overheated. It is preferable to position it at a predetermined position.

According to the embodiment of the present invention, the position of the solar cell unit 1 for the solar power generation is fixed and the sun's position is changed so that the solar cell converges to the solar cell regardless of the direction in which sunlight is incident. Therefore, it has an effect of prolonging the photovoltaic generation time, and consequently, the light collection efficiency and the power generation efficiency are improved. Therefore, according to the solar cell unit for solar power generation according to the present invention, it is possible to improve the light-condensing efficiency and the power generation efficiency without using an expensive tracker.

Meanwhile, the solar cell unit for photovoltaic power generation according to the present embodiment can fix the mounting position, not the position, according to the position of the sun. However, it is preferable that the fixed installation position is provided so as to correspond to the position of the sun in the time zone in which the incident amount is the greatest. For example, in the mid-latitude region, it can be installed in the South Pacific. In such a case, the solar cell unit can be installed at a predetermined angle inclination.

13 and 14, another embodiment of the solar cell unit for photovoltaic power generation according to the present invention will be described.

The present embodiment is also substantially the same as the above-described embodiment. In this embodiment, unlike the above-described embodiment, the guide is not an integral shape that encloses all of the solar cells, but a plurality of guides 900 and 900a separated into strips and corresponding to the guides 900 and 900a A plurality of solar cells 990 and 990a are used. This is because it is easier to gather the focal points of the lenses provided in the band-shaped guides into one, as compared with collecting the foci of all the lenses provided in the hemispherical guide of the embodiment described above. In addition, according to the present embodiment, solar light can be gathered less than when the guide is hemispherical, but it is easy to apply it when constructing a large-scale solar power generation complex by increasing the size of the band-shaped guide.

First, referring to Fig. 13, one guide 900 will be described.

The shape of the guide 900 is not limited, but it is provided in a substantially curved band shape. That is, the guide 900 preferably has a band shape and a shape having a predetermined curvature. The guide 900 is provided with a plurality of lenses 910. The lens 910 is provided to converge the focus to one position FL1, and a solar cell 990 is provided at the focal point.

As shown in Fig. 14, it is preferable that a plurality of the above-mentioned band-shaped guides 900, 900a are provided adjacent to each other. Of course, the lenses provided in the respective guides 900 900a are provided to converge to the respective focuses FL1 and FL2. Each of the solar cells 990 and 990a is provided at the position of each of the focuses FL1 and FL2. Although FIG. 14 shows two guides 900 and 900a for the sake of convenience, it is not limited thereto and it is preferable to install two or more guides 900 and 900a.

Meanwhile, the guide 900 900a may be installed to have a predetermined inclination. For example, guide 900 900a itself is installed from east to west. It is preferable that the guides 900 and 900a are provided so as to have a predetermined inclination in the north-south direction so as to be in a state suitable for receiving sunlight from the sun S according to the latitude of the place where the solar cell unit is installed . Also in this embodiment, it is preferable that a small lens 950 is provided on the upper part of the solar cell 990.

In this embodiment, similarly to the above-described embodiment, sunlight incident on each of the guides 900 and 900a converges on the solar cells 990 and 990a corresponding to the guides 900 and 900a by the lens, The efficiency of light collection can be increased.

According to another embodiment of the solar cell unit for photovoltaic power generation according to the present invention, it is preferable that a coating layer which reflects sunlight of a long wavelength and absorbs sunlight of a short wavelength is provided outside the guide. With this configuration, it is possible to prevent heat from being generated in the solar cell unit. In the photovoltaic unit for solar power generation according to the present invention, the solar cell may use various types such as silica series and gallium arsenide series, but it is preferable to use a gallium arsenide series. The present invention can also be applied to a tracking type photovoltaic power generation system.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments. That is, the present invention is not limited to the embodiments described above, and various modifications and variations are possible in light of the above description of the present invention.

1: solar cell unit 300: body
500: Guide 410: Solar cell

Claims (26)

An upper part having a plurality of through holes and a lower part connected to the upper part, wherein the inside of the upper part and the inside of the lower part constitute an ellipsoid, the inside of which is a reflecting mirror;
A solar cell positioned at an apex of a long axis of the ellipsoid;
And a plurality of guide holes communicating with the through holes of the upper portion and decreasing in diameter from the outer side to the inner side,
Wherein the sunlight is incident on the inside of the body through the guide hole and the through hole, and the incident sunlight is repeatedly reflected inside the body to converge into the solar cell. The solar cell unit for solar power generation according to claim 1, wherein a band-shaped solar cell band is provided inside the body corresponding to the focus of the ellipsoid. The solar cell unit for solar power generation according to claim 1 or 2, wherein a Fresnel lens is provided at the entrance of the guide hole. The solar cell unit for solar photovoltaic power generation according to claim 1 or 2, wherein a convex lens is provided at the entrance of the guide hole. The solar cell unit for solar power generation according to claim 1, wherein the guide is an ellipsoid. The solar cell unit for solar power generation according to claim 1, wherein a lower portion of the body is embedded in the ground. delete delete delete delete delete delete delete delete An upper part having a plurality of through holes and a lower part connected to the upper part, wherein the inside of the upper part and the inside of the lower part constitute an ellipsoid, the inside of which is a reflecting mirror;
A solar cell positioned at an apex of a long axis of the ellipsoid;
A guide having a plurality of guide holes communicating with the through holes of the upper portion and decreasing in diameter from the outside to the inside;
And a lens provided at an entrance of the guide hole,
Wherein the sunlight is incident on the inside of the body through the lens, the guide hole, and the through hole, and the incident sunlight is repeatedly reflected within the body to converge into the solar cell. delete delete delete delete delete delete delete delete delete delete delete
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Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20090078249A1 (en) * 2007-05-24 2009-03-26 Tricia Liu Device for concentrating optical radiation

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20090078249A1 (en) * 2007-05-24 2009-03-26 Tricia Liu Device for concentrating optical radiation

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