The Solar Energy Concentrator And Photoelectric Conversion System Design Of The OMEGA Space Solar Power Station

Space Solar Power Station(SSPS)is a gigantic power satellite with large size and mass,high power and degree of complexity,which will be a great engineering challenge never encountered before.In view of the advantages and disadvantages of several typical concepts of space solar power station,this dissertation presents a novel design concept-the OMEGA,and is mainly concerned with the structural,optical and thermal performances on its solar energy collection and conversion system.The author's major contribution on the subject can be summarized as follows:1)The SSPS-OMEGA design scheme is proposed.The concept consists of spherical concentrator,line-focus photovaltic cell array and active phased array antenna.Compared with classical concepts,the novel design has several advantages:(1)Higher power-mass ratio,up by one third to the latest international concept-the ALPHA,with high energy collection stability;(2)avoiding complex structural control strategies;(3)Greatly reducing the difficulties on thermal design.2)Structural design and performance analysis of large-scale concentrator is performed.Based on the light collection rate,the design method of large concentrator is proposed.Splicing strategy is established via partitioning octahedron on the sphere and polygonal mesh.Optical analysis indicates that the spherical concentrator constructed with new mesh strategy can have high energy collection efficiency and good symmetry of energy distribution.Design are implemented on the structure,geometry and the connection of the components of the concentrator.Modal analysis is conducted to obtain the natural frequency and modal shape,which is a certain reference for the subsequent detailed structural design.3)Structural design and performance analysis of PV cell array.Through establishing the relationship between the incident sunrays and cell array,and combining the response characteristic of cell component,a method for analyzing the performance of photovoltaic cell array based on non-imaging optics is proposed.Optimization of cell array structure is presented with regarding of geometrical characteristics,thermal characteristics and optical properties.The simulation results indicate that,through the optimization,the optimal cell array can have high energy collection efficiency and uniform energy distribution,which is of benefit to reducing the design difficulty of the series and parallel circuit of the cell.4)The Analysis of on orbit thermal performance is performed.The internal and external heat load(heat flux input)of the OMEGA system in geostationary orbit is derived.The finite element analysis model is established,and the temperature distribution characteristics of the main components of the OMEGA system are analyzed numerically.In addition,the structural performance of the large structures,such as the concentrator and the photoelectric conversion system,are analyzed in detail and systematically,which lays the foundation for the final structural design and thermal design.