A secondary concentrator

A secondary concentrator and concentrator technology, applied in the energy field, can solve problems such as inapplicability and generality, and achieve the effect of solving poor generality and improving uniformity

Active Publication Date: 2017-04-19
SHANGHAI INST OF SPACE POWER SOURCES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The object of the present invention is to provide a secondary concentrator for concentrating solar photovoltaic systems, which uses the uneven curved surface of the side wall of the secondary concentrator to improve the uniformity of light intensity distribution and solve the problem of incident light in the prior art. The problem of inapplicability when the light deviates from the axis and the problem of poor versatility

Method used

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Examples

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Embodiment 1

[0051] see Image 6 , the secondary concentrator adopts a cylindrical shape, the upper end of the side wall adopts a ring-shaped sawtooth groove, and the lower end adopts a smooth cylindrical surface. And irradiate the side wall, and the light irradiating each groove surface on the side wall can be regarded as an independent light source. Now take one of the groove surfaces for analysis, such as Image 6 The second groove surface on the left side of the center, the light irradiated on the groove surface becomes divergent light after reflection, and then converges to the bottom after multiple reflections on the side wall. It can be seen that the scattered light emitted by a single groove surface can be illuminates the entire battery surface. Although the uniformity of the light emitted by a single groove surface at the bottom cannot reach an ideal state, after the superposition of light reflected by multiple groove surfaces, a uniform light intensity distribution can finally ...

Embodiment 2

[0061] see Figure 7 , the secondary concentrator adopts a cylindrical shape, and the side walls adopt annular sawtooth grooves. Assume that by controlling the height of the concentrator, all light rays can only be reflected at most 3 times on the side wall. For incident light The range is still 0º~30º. Since the height of the groove part is greater than that of Example 1, the light irradiated on the groove part corresponds to The angular range will be larger, assuming 15º to 30º, and the rest of the light will be directly irradiated on the bottom of the concentrator.

[0062] According to the above formula, the relevant parameters can be substituted into:

[0063] ,

[0064] Consider the worst case, that is, the maximum angle between the normal direction and the horizontal direction of the surface of the groove part where the three reflection points are all place, namely: . exist is 30º, it can be obtained is 5.2º. Therefore, in order to ensure total reflect...

Embodiment 3

[0069] see Figure 8 , the secondary concentrator adopts the shape of a rounded table, and the side walls adopt ring-shaped sawtooth grooves, and the angle of the sawtooth is changed from the acute angle in Implementation 2 to a right angle or an obtuse angle, so as to facilitate the processing of the curved surface of the side wall. Note that it is necessary to Control the slope of the side wall of the circular frustum, that is, Figure 8 The included angle between the dotted line and the vertical direction is to avoid two or more consecutive reflections of light on the same side of the side wall.

[0070] Assume that by controlling the height of the concentrator, all light rays can only be reflected at most 3 times on the side wall. For incident light In the case where the range is still 0°~30°, the allowable range of the included angle between the surface normal direction and the horizontal direction of the groove part is the same as that in Embodiment 2, that is, 0°~5.2...

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Abstract

The invention relates to a secondary condenser. The overall secondary condenser is columnar and comprises a top and a bottom, the bottom can be connected with a solar battery of a condensation solar photovoltaic system, and the surface of the lateral wall of the condenser is composed of a rugged curve face formed by a plurality of tiny units. By means of the secondary condenser, the light distribution uniformity can be improved through the adoption of the rugged curve face on the lateral wall of the secondary condenser, the problems of inapplicability and poor universality caused when incident rays departure from the axis to a large extent in the prior art are solved, the secondary condenser has the good practicability, and the manufacturing cost of the condensation solar photovoltaic system is reduced.

Description

technical field [0001] The invention relates to solar photovoltaic technology in the field of energy, in particular to a secondary concentrator for concentrated solar photovoltaic systems. Background technique [0002] Compared with ordinary solar cells, concentrating solar cells have higher conversion efficiency and are one of the key development directions in the field of photovoltaic power generation. For issues such as high tracking accuracy requirements, the use of secondary concentrators can effectively improve the uniformity of spot intensity distribution, such as the paper "Secondary optics for Fresnellens solar concentrators" published in Proc. of SPIE Vol. 7785 778509-1 and published in "Infrared The paper "Design and Performance Analysis of Total Reflection Secondary Concentrator Applied to Concentrating Photovoltaic Modules" in Vol. These secondary concentrators generally adopt the structure of chamfered truss or rounded truss, and its side wall is a smooth plan...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01L31/054
CPCY02E10/52
Inventor 雷刚程志军范襄
Owner SHANGHAI INST OF SPACE POWER SOURCES
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