Study On The Full Solar Spectrum Utilization Technology Based On A Large Area Dish-type Concentrated Solar Energy System

Based on the idea of full solar spectrum utilization,an in-depth research on High Concentrator Photovoltaic(HCPV)system is carried out in this thesis.Taking the requirements on energy distribution and cooling temperature of HCPV systems into consideration,we have studied solar photovoltaic-thermal utilization system,integrated photovoltaic and agricultural utilization system,and the complementary utilization of solar lighting system respectively,based on a large area dish-type concentrated solar energy system.The relevant mathematical models and system implementation schemes are established for the above three kinds of applications scenarios.Through continuous comparison between theoretical calculations,simulations and experimental results and then corresponded modifications,a series of problems,such as low solar spectrum utilization rate and high temperature of concentrating solar cell,have been solved for existing HCPV systems.Thus,a high performance of the full solar spectral utilization technology based on large area dish-type concentrated solar energy system is proposed.The specific research contents are as follows:1.The solar photovoltaic-thermal utilization technology has been studied.A theoretical model of the photovoltaic array is established,then the electrical performance is analyzed.Without any effective heat dissipation structure,the temperature of the photovoltaic array is in the range of 578°C to 896°C,far exceeding the normal operating temperature of the concentrator solar cell.The heat dissipation structure of the solar cell is optimized to ensure that the working temperature of the solar cell is lower than 38°C,and the waste heat of the solar cell is used properly.2.In view of the impact of traditional photovoltaic systems on agriculture and the low efficiency of photovoltaic vegetable greenhouse,a scheme of integrate concentrating photovoltaics with agriculture is proposed.A theoretical model of photovoltaic and agricultural utilization mode based on a dish-type concentrated solar energy system is constructed,and the design and implementation of the application system is also studied.Considering the key parameters of plant growth characteristics include wavelength,intensity and photoperiod of light source,the beam splitter is designed to meet the requirements of plant growth and photovoltaic generation at the same time,and a specific implementation scheme is proposed.Through the simulation and optimization of each unit of the system,the design basis of the beam splitting for the major crops in China is provided.3.In view of the application of solar lighting technology at present,a complementary utilization model based on a dish-type concentrated solar energy system is put forward.A theoretical model is established,and a reasonable beam split thin film is designed.Then the system structure and specific implementation scheme matching with optical film are also designed.The simulation and contrast analysis of the performance of the system under different light intensity are carried out.The results show that the system meets the basic requirements of all day lighting,and has about 40% utilization ratio of solar energy.