Fresnel spotlight and realization method thereof

Abstract

The invention discloses a Fresnel spotlight and a realization method thereof applied in a solar energy concentration photovoltaic system. The Fresnel spotlight comprises a series of concentric annular lenses and is characterized in that parameters determining lens position including gear pitch, gear height, curvature and cone parameter, are all independently calculated, and the annular lenses are set into form annular defocus, energy annules formed by the adjacent annules on the surface of solar cell are sequentially arranged, and finally the energy annules formed by each annule are integrated into a convergent light spot with good uniformity. If individual position of the convergent light spot is found to have phenomena, such as high energy or low energy when in illuminated area simulating detection, the energy of the illuminated area can be compensated through regulating the defocus on an annule or certain annules of Fresnel lens, thereby ensuring that the central energy extreme point of the confocal Fresnel lens is eliminated and the illumination degree uniformity of the light spots is improved under the conditions that the light spot areas are equal to that of the solar cells, and the concentration rate and the penetration rate are consistent.

Description

technical field [0001] The invention relates to a concentrating device in a solar concentrating photovoltaic system, in particular to a Fresnel concentrator applied to a high-power concentrating photovoltaic module, which realizes the uniform concentrating effect on sunlight beams. Background technique [0002] At present, the commonly used solar concentrators are mainly divided into transmissive structures and reflective structures, and transmissive concentrators are divided into ordinary lens concentrators and Fresnel concentrators. The Fresnel concentrator is characterized by its thinness (because it is made of plastic), and it can be mass-produced using replication technology. It is molded by compression molding, which greatly reduces the production cost, and the Fresnel lens is made of multiple The curvature of each ring can be controlled independently, which can better correct the lens aberration. The commonly used Fresnel lenses are designed by the confocal method, t...

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Problems solved by technology

[0003] In order to solve the problem of inhomogeneity of the focused spot energy of the Fresnel lens designed by the confocal method, the present invention provides a Fresnel lens designed by the defocus method and its implementation method. The lens can not only ensure The concentrating ratio of the concentrator and the transmittance of light energy can be improved, and the uniformity of the concentrating spot can be improved, thereby improving the quality of the solar cell receiving the concentrating spot

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