Research And Design Of Concentrator For Space Solar Power Satellite

With the growth of world's population and the development of industry,the demand for energy is increasing, but the fossil energy which is the human mainly rely on is gradually drying up, environmental pollution and climate issues become more serious, this contradiction will become more outstanding in the future. It is urgent to find new energy to replace the traditional fossil fuels. Compared with terrestrial solar energy ?wind energy? hydro energy? nuclear energy and other new energy,space solar energy has the advantages of huge reserves, safety and stability. Professor Mankins of the United States proposed a new solution to solve the space solar power generation in 2011,SPS-ALPHA:Solar Power Satellite via Arbitrarily Large Phased Array. But there is no specific implementation process of SPS-ALPHA. The purpose of this paper is to design SPS-ALPHA concentrator and then realize the modeling and simulation based on the research of SPS-ALPHA. Eventually the high concentration ratio and a high uniformity can be obtained on the photovoltaic panels.Firstly, on the basis of a detailed analysis of the structure of the SPS-ALPHA, generatrix equation parameter of the concentrator primary mirror is optimized. A three dimensional model of SPS-ALPHA is set up in matlab. Equivalent Illuminate area is intercepted every hour in one day, then the total area is calculated through the method of image processing, when the total area is the largest, generatrix equation parameters are optimum. And the restriction relationship between the adjacent reflectors in the same layer, the restriction relationship between the adjacent reflectors in upper and lower layer are analyzed,the integration of modeling and simulation of SPS-ALPHA is achieved.Secondly, for the large-scale modeling of SPS-ALPHA, the secondary development technology of Solid Works is proposed to build the primary reflector of SPS-ALPHA concentrator, and the problem of automatic modeling is solved. Under the environment of Solid Works, SPS-ALPHA can be simulated by optical simulation software Optis Works.Then, when the secondary mirror generatrix is parabolic or hyperbolic, the physical mathematical model of SPS- ALPHA is set up. Monte Carlo ray tracing method is used to optimize the parameters of the secondary mirror concentrator generatrix equation, then the focus of primary mirror and the focal length of secondary mirror are determined. Additionally, Optis Works simulation is maked to verify the correctness of the results in Solid Works.In the end, the number of blocks in each layer and the spacing between reflectors of the concentrator model are compared and optimized in Solid Works, the optimum values are determined, so that the energy flow density of light spot is the largest, and has a good uniformity.