CN110703424A - Two-stage composite condenser with enhanced dodging function and application thereof - Google Patents
Two-stage composite condenser with enhanced dodging function and application thereof Download PDFInfo
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- CN110703424A CN110703424A CN201910936593.5A CN201910936593A CN110703424A CN 110703424 A CN110703424 A CN 110703424A CN 201910936593 A CN201910936593 A CN 201910936593A CN 110703424 A CN110703424 A CN 110703424A
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- 239000002131 composite material Substances 0.000 title claims abstract description 28
- 238000010248 power generation Methods 0.000 claims abstract description 15
- 150000001875 compounds Chemical class 0.000 claims description 12
- 238000010521 absorption reaction Methods 0.000 claims description 11
- 238000007517 polishing process Methods 0.000 claims description 3
- 238000002310 reflectometry Methods 0.000 claims description 3
- 238000000576 coating method Methods 0.000 claims description 2
- 230000002708 enhancing effect Effects 0.000 claims 4
- 238000004364 calculation method Methods 0.000 abstract description 3
- 230000003287 optical effect Effects 0.000 description 22
- 238000000034 method Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000010146 3D printing Methods 0.000 description 1
- JBRZTFJDHDCESZ-UHFFFAOYSA-N AsGa Chemical compound [As]#[Ga] JBRZTFJDHDCESZ-UHFFFAOYSA-N 0.000 description 1
- 229910001218 Gallium arsenide Inorganic materials 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000007747 plating Methods 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B19/00—Condensers, e.g. light collectors or similar non-imaging optics
- G02B19/0033—Condensers, e.g. light collectors or similar non-imaging optics characterised by the use
- G02B19/0038—Condensers, e.g. light collectors or similar non-imaging optics characterised by the use for use with ambient light
- G02B19/0042—Condensers, e.g. light collectors or similar non-imaging optics characterised by the use for use with ambient light for use with direct solar radiation
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B19/00—Condensers, e.g. light collectors or similar non-imaging optics
- G02B19/0004—Condensers, e.g. light collectors or similar non-imaging optics characterised by the optical means employed
- G02B19/0019—Condensers, e.g. light collectors or similar non-imaging optics characterised by the optical means employed having reflective surfaces only (e.g. louvre systems, systems with multiple planar reflectors)
-
- 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
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- 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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- Optics & Photonics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
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- Photovoltaic Devices (AREA)
Abstract
The invention belongs to the field of solar photovoltaic power generation, and particularly discloses a two-stage composite condenser with a light homogenizing function and application thereof. The second-stage composite condenser comprises a first condenser and a second condenser which are sequentially connected along the light propagation direction, wherein the first condenser is in a gradually-reduced parabolic shape, the second condenser is in a gradually-expanded parabolic shape, and the condensing ratio of the first condenser is greater than that of the second condenser. According to the invention, the first condenser in a gradually-reduced parabolic shape and the second condenser in a gradually-expanded parabolic shape are sequentially connected to obtain the secondary composite condenser, so that a non-parallel light-gathering source can be effectively and uniformly concentrated, the uniformity of surface light spots of the photovoltaic cell is ensured, the high-temperature problem caused by local high light-gathering ratio is avoided, the efficiency and the service life of the photovoltaic cell are effectively improved, and the uniformity of light rays emitted by the secondary composite condenser provided by the invention can be improved by more than 50% according to Monte Carlo ray tracing calculation.
Description
Technical Field
The invention belongs to the field of solar photovoltaic power generation, and particularly relates to a two-stage composite condenser with a light homogenizing function and application thereof.
Background
The solar photovoltaic power generation technology is a technology for collecting solar energy through a solar energy light-collecting device (such as a Fresnel lens and the like) and a solar tracking device and generating power by utilizing a solar photovoltaic cell. Wherein the solar concentration device directly affects the efficiency of solar photovoltaic power generation.
However, in practical application, the conventional condenser has limited light-gathering capacity, the gathered solar energy obtained on the surfaces of the heat collector and the photovoltaic cell is very uneven, and the local light-gathering ratio can exceed several times of the average light-gathering ratio, so that partial areas are over-heated and even damaged. CN201310408240 discloses a secondary condenser for a concentrated solar photovoltaic system, wherein the top surface of the secondary condenser is an uneven curved surface formed by a plurality of small units regularly arranged periodically or in an irregular shape, which can effectively improve the light concentrating efficiency, but most of light rays still cannot be reflected by the side wall and directly converge on a bottom photovoltaic cell, so that the problem of poor light homogenizing effect still exists.
Taking gallium arsenide solar cells as an example, this type of photovoltaic cell can withstand high temperatures of 250 ℃ to 350 ℃, but its efficiency decreases with increasing temperature. Under the condition of high-concentration-ratio point concentration, local concentration energy flow is too high due to uneven light spots and high temperature is generated, the efficiency of a photovoltaic cell is reduced even the cell is damaged due to local high temperature, and great challenges are brought to safe and economic operation of concentrated solar photovoltaic power generation, so that the realization of homogenizing light spots is the basis for realizing safe and efficient utilization of solar energy.
Disclosure of Invention
Aiming at the defects or the improvement requirements of the prior art, the invention provides a two-stage composite condenser for strengthening the dodging function and application thereof, wherein the two condensers are reversely connected, and the condensing ratio of a first condenser is set to be larger than that of a second condenser, so that the two-stage composite condenser obtains a stronger dodging function, effectively avoids the problem of uneven light spots and is particularly suitable for application occasions of solar photovoltaic power generation.
In order to achieve the above object, according to one aspect of the present invention, there is provided a two-stage compound optical concentrator with an enhanced dodging function, the two-stage compound optical concentrator including a first optical concentrator and a second optical concentrator connected in sequence along a light propagation direction, wherein the first optical concentrator is in a tapered parabolic shape, the second optical concentrator is in a tapered parabolic shape, and a concentration ratio of the first optical concentrator is greater than a concentration ratio of the second optical concentrator.
More preferably, the light condensing ratio of the first condenser is preferably 4 to 36.
More preferably, the light condensing ratio of the second condenser is preferably 4-9.
Further preferably, a ratio of the condensing ratio of the first condenser to the condensing ratio of the second condenser is 4 or less.
Further preferably, the absorption angle of the first condenser is smaller than the absorption angle of the second condenser, and the absorption angle of the first condenser and the absorption angle of the second condenser are preferably 60 ° to 120 °.
As a further preferred, the inner surfaces of the first and second condensers are processed using a polishing process or a plating process for improving the reflectivity.
According to another aspect of the present invention, there is provided an application of the above-mentioned two-stage compound condenser in a photovoltaic power generation system, the photovoltaic power generation system includes a primary light-condensing device, the two-stage compound condenser and a photovoltaic cell, which are arranged in sequence from top to bottom, and the two-stage compound condenser is configured to uniformly project a non-parallel light-condensing source emitted by the primary light-condensing device onto the photovoltaic cell.
Further preferably, the primary light-condensing means is preferably a fresnel lens.
Generally, compared with the prior art, the above technical solution conceived by the present invention mainly has the following technical advantages:
1. according to the invention, the first condenser in a gradually-reduced parabolic shape and the second condenser in a gradually-expanded parabolic shape are sequentially connected to obtain the secondary composite condenser, so that a non-parallel light-gathering source can be effectively and uniformly condensed, the surface light spots of the photovoltaic cell are ensured to be uniform, the high-temperature problem caused by local high light-gathering ratio is avoided, and the efficiency and the service life of the photovoltaic cell are effectively improved;
2. particularly, the invention optimizes the concentration ratio of the first condenser, the concentration ratio of the second condenser and the ratio thereof, and can ensure that more high-energy concentrated light rays are projected onto the photovoltaic cell after being reflected twice by the first condenser and the second condenser, thereby effectively improving the uniformity of the concentrated light spots, and the uniformity of the light rays emitted by the second-level composite condenser designed by adopting the parameters can be improved by more than 50%;
3. in addition, the two-stage composite condenser is applied to the photovoltaic power generation system, the uniformity of light spots on the surface of the photovoltaic cell is improved, and meanwhile, the condensing ratio of the two-stage composite condenser can be adjusted according to actual requirements, so that the precision requirements on a primary condensing device and a tracking device are reduced, and the production cost is further reduced.
Drawings
FIG. 1 is a schematic diagram of a two-stage composite concentrator with enhanced dodging constructed in accordance with a preferred embodiment of the present invention;
fig. 2 is a schematic diagram of the application of the two-stage composite concentrator provided by the present invention to a photovoltaic power generation system.
The same reference numbers will be used throughout the drawings to refer to the same or like elements or structures, wherein:
1-a first condenser, 2-a second condenser, 3-a primary condenser, 4-a secondary composite condenser and 5-a photovoltaic cell.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
As shown in fig. 1, an embodiment of the present invention provides a two-stage compound optical concentrator with an enhanced dodging function, the two-stage compound optical concentrator includes a first optical concentrator 1 and a second optical concentrator 2 sequentially connected along a light propagation direction, where the first optical concentrator 1 is in a tapered parabolic shape, the second optical concentrator 2 is in a tapered parabolic shape, a light concentration ratio of the first optical concentrator 1 is greater than a light concentration ratio of the second optical concentrator 2, and an absorption angle of the first optical concentrator 1 is smaller than an absorption angle of the second optical concentrator 2, during operation, sunlight is reflected once from an inlet of the first optical concentrator 1 or directly enters an outlet of the first optical concentrator 1, and most of the light is reflected twice by the second optical concentrator 2 and then exits from an outlet of the second optical concentrator 2, so as to form a more uniform light spot on a photovoltaic cell and avoid occurrence of a local high temperature.
Further, the first condenser 1 has an inlet sectional area S1The cross-sectional area of the outlet of the first condenser 1 is S2Concentration ratio R of the first condenser 11The calculation was performed using equation (1):
to ensure the receiving and uniformity function of the first condenser 1 so that more high-energy condensed light can pass through the primary reflection of the first condenser 1, the condensing ratio R of the first condenser1The value of (A) is preferably 4-36;
the cross-sectional area of the entrance of the second condenser 2, i.e., the cross-sectional area of the exit of the first condenser 1, is S2The cross-sectional area of the outlet of the second condenser 2 is S3Concentration ratio R of the second condenser 22The calculation is carried out by adopting the formula (2),
to ensure the receiving and uniformity function of the second condenser 2, more high-energy condensed light can pass through the second condenserSecondary reflection of the second condenser 2, condensing ratio R of the second condenser2Preferably 4-9;
in addition, the ratio of the light concentration ratio of the first condenser to the light concentration ratio of the second condenser is less than or equal to 4, the processing difficulty of the second-stage composite condenser is avoided to be too large, the light homogenizing efficiency of the second-stage composite condenser is effectively improved, and the uniformity of light rays emitted by the second-stage composite condenser is improved by more than 50%.
Further, the two-stage composite condenser may be manufactured by a conventional casting method or a 3D printing technique, and the inner surfaces of the first condenser 1 and the second condenser 2 are processed by a polishing process or a coating process for improving reflectivity.
Further, the absorption angle of the first condenser 1 and the absorption angle of the second condenser 2 are preferably 60 ° to 120 °.
According to another aspect of the present invention, as shown in fig. 2, there is provided an application of the above-mentioned two-stage compound condenser in a photovoltaic power generation system, the photovoltaic power generation system includes a primary light-condensing device 3, a two-stage compound condenser 4 and a photovoltaic cell 5, which are sequentially arranged from top to bottom, the sunlight passes through the primary light-condensing device 3 such as a fresnel lens to generate a non-parallel light-condensing source with a larger field angle, and after being concentrated by primary reflection of the first condenser 1 and diverged by secondary reflection of the second condenser 2, the originally unevenly distributed light sources are more orderly distributed and uniformly projected onto the photovoltaic cell 5.
The light condensing ratio of the secondary composite condenser can be adjusted according to actual requirements while the uniformity of light spots on the surface of the photovoltaic cell is improved, so that the precision requirements on the primary condensing device and the tracking device are reduced, and the production cost is further reduced.
It will be understood by those skilled in the art that the foregoing is only a preferred embodiment of the present invention, and is not intended to limit the invention, and that any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (8)
1. The two-stage composite condenser with the light homogenizing function is characterized by comprising a first condenser (1) and a second condenser (2) which are sequentially connected along the light propagation direction, wherein the first condenser (1) is in a gradually-reduced parabolic shape, the second condenser (2) is in a gradually-expanded parabolic shape, and the condensing ratio of the first condenser (1) is greater than that of the second condenser (2).
2. The two-stage composite condenser for enhancing dodging function according to claim 1, wherein the condensing ratio of the first condenser (1) is preferably 4-36.
3. The two-stage composite condenser for enhancing dodging function as claimed in claim 1 or 2, wherein the condensing ratio of the second condenser (2) is preferably 4-9.
4. The two-stage composite condenser with the enhanced dodging function as claimed in any one of claims 1 to 3, wherein the ratio of the condensing ratio of the first condenser (1) to the condensing ratio of the second condenser (2) is less than or equal to 4.
5. The two-stage composite concentrator for enhancing dodging according to claim 1, wherein the absorption angle of the first concentrator (1) is smaller than that of the second concentrator (2), and the absorption angle of the first concentrator (1) and the absorption angle of the second concentrator (2) are preferably 60 ° to 120 °.
6. The two-stage composite condenser for enhancing dodging function according to claim 1, wherein the inner surfaces of the first condenser (1) and the second condenser (2) are processed by polishing process or coating process for improving reflectivity.
7. Use of the two-stage compound concentrator according to any one of claims 1 to 6 in a photovoltaic power generation system, wherein the photovoltaic power generation system comprises a primary light concentrating device (3), the two-stage compound concentrator (4) and a photovoltaic cell (5) which are arranged in sequence from top to bottom, and the two-stage compound concentrator (4) is used for uniformly projecting non-parallel concentrated light sources emitted by the primary light concentrating device (3) onto the photovoltaic cell (5).
8. Use of a two-stage composite concentrator according to claim 7 in a photovoltaic power generation system, wherein the primary concentrating means (3) is preferably a fresnel lens.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910936593.5A CN110703424A (en) | 2019-09-29 | 2019-09-29 | Two-stage composite condenser with enhanced dodging function and application thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910936593.5A CN110703424A (en) | 2019-09-29 | 2019-09-29 | Two-stage composite condenser with enhanced dodging function and application thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112462513A (en) * | 2020-12-04 | 2021-03-09 | 中南大学 | Design method of combined paraboloid type solar condenser |
| CN114527558A (en) * | 2022-02-14 | 2022-05-24 | 华北电力大学 | Sphere-like reflection condenser considering sun field angle |
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| KR20050119524A (en) * | 2004-06-16 | 2005-12-21 | 황우성 | Compound parabolic concentrator for uniform energy distribution on the receiver surface |
| CN101034204A (en) * | 2007-01-26 | 2007-09-12 | 北京理工大学 | Mirror image focus eclipsed direction changeable parallel light energy flux density multiplier and design method thereof |
| CN102621693A (en) * | 2012-03-19 | 2012-08-01 | 泰山集团泰安市普瑞特机械制造有限公司 | Light balancing device for concentrated solar energy |
| CN203747745U (en) * | 2014-01-07 | 2014-07-30 | 武汉凹伟能源科技有限公司 | High light-concentrated solar lighting module group |
| CN106931399A (en) * | 2017-02-24 | 2017-07-07 | 榆林学院 | The connector that a kind of solar energy is collected and conducted |
-
2019
- 2019-09-29 CN CN201910936593.5A patent/CN110703424A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20050119524A (en) * | 2004-06-16 | 2005-12-21 | 황우성 | Compound parabolic concentrator for uniform energy distribution on the receiver surface |
| CN101034204A (en) * | 2007-01-26 | 2007-09-12 | 北京理工大学 | Mirror image focus eclipsed direction changeable parallel light energy flux density multiplier and design method thereof |
| CN102621693A (en) * | 2012-03-19 | 2012-08-01 | 泰山集团泰安市普瑞特机械制造有限公司 | Light balancing device for concentrated solar energy |
| CN203747745U (en) * | 2014-01-07 | 2014-07-30 | 武汉凹伟能源科技有限公司 | High light-concentrated solar lighting module group |
| CN106931399A (en) * | 2017-02-24 | 2017-07-07 | 榆林学院 | The connector that a kind of solar energy is collected and conducted |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112462513A (en) * | 2020-12-04 | 2021-03-09 | 中南大学 | Design method of combined paraboloid type solar condenser |
| CN114527558A (en) * | 2022-02-14 | 2022-05-24 | 华北电力大学 | Sphere-like reflection condenser considering sun field angle |
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