Design Of High Efficiency Concentrated Photovoltaic System Based On Gradient Index Medium

The utilization rate of traditional energy sources such as coal and petroleum is increasing year by year,but the reserves of resources are limited.Therefore,the development and utilization of solar energy is favored by a large number of scientific researchers.Solar energy has many advantages over other energy sources,huge resource reserves,unlimited use,clean and pollution-free.At present,problems such as low energy density and excessive beam divergence of solar rays limit its large-scale application.As a high-focusing optical system,the solar concentrator can improve the utilization efficiency of solar energy and apply lightguide plates to solar energy.The optical device has become a new type of optical solution,which needs to combine imaging optics and non-imaging optics to more comprehensively design and analyze optical systems.Aiming at the problem of light escape out of the lightguide plate,this paper proposes a high-efficiency concentrating photovoltaic system design solution based on the gradient index medium,and provides an application of the gradient index material lightguide plate in the concentrating photovoltaic system.The theory is verified,and it plays a certain guiding role for the application of small-scale concentrating photovoltaic systems in daily life,while meeting the design requirements of light leakage-free.This solution can give full play to the respective performance advantages of parabolic surface type concentrated module,cylindrical lens concentrated module and gradient index material lightguide plate,and efficiently transmit solar rays to photovoltaic cells.The main research contents are as follows:(1)Firstly,the research purpose and significance of this subject are explained,the current development status of domestic and foreign solar concentrators and the working principle of the concentrating photovoltaic system are described.At the same time,the general research situation of gradient index optics is given,which makes clear the idea for the design scheme of the system architecture.(2)Then,the ray tracing method and optical design principle used in the solar concentrating system are given.At the same time,the relevant theory of non-imaging optics needed in the design process is analyzed,and the specific theoretical derivation of the parameters for concentrating performance is given.Finally,the related theoretical basis of gradient index is analyzed.(3)The parabolic surface type concentrated module scheme is selected and uses total reflection principle to focus the light onto the hemispherical optical coupling structure.The lightguide plate uses a flat lens of a gradient index material.Using the Light Tools software,the design parameters of the light-concentrating module and the lightguide plate are simulated and optimized to find the optimal solution;a homogeneous material lightguide plate is established as an experimental comparison model.The optical efficiency of the two types of CPV systems and the effects of different structural parameters on the optical performance are analyzed.(4)The cylindrical lens concentrated module scheme is selected,the light can be focused on the triangular prism optical coupling structure under the gradient index material lightguide plate,and self-focusing occurs in the same direction.The ray tracing software is used to simulate and optimize each optical structure,and a comparison model is established.The optical parameters and structural parameters of the two systems are sampled,and the reasonable analysis of the optical performance is obtained.