| Photovoltaic cells is a semiconductor device that converts optical energy directly into electrical energy according to the photovoltaic effect.While studying the output characteristics of photovoltaic cells,people often want to make an accurate prediction according to understanding their change rules.This introduces an optimal physical model of photovoltaic cells,namely use the mathematical tools of photovoltaic cell physical model for accurate digital construction.One of the most optimized criteria for measuring the physical model of photovoltaic cell is to accurately represent the changing rules of output characteristics of photovoltaic cells as well as use mathematical tools to solve this mathematical model quickly to get the best value.Most of previous study about the physical model of photovoltaic cells are the mathematical model based on semi empirical model,which need to balance between the accuracy and the speed,so it is necessary to further research the optimum physical model of photovoltaic cell in order to more accurate predict the output characteristics of photovoltaic cells.Based on this principle,in this paper,on the basis of the explicit and implicit mathematical models of photovoltaic cells proposed by previous studies,we have studied the extraction algorithm and optimal model process of different types of cells.The algorithm of iterative analytical and numerical method based on the combination of the optimal extraction parameters was studied,and the single crystal silicon cells with the different sample points was reconstructed by taking advantage of algorithm and optimal parameters of several popular algorithm proposed.Through the comparison of the optimal parameters of different extraction algorithm in the process of iteration accuracy and iteration speed,the optimal extraction algorithm,and the optimal extraction parameters of single crystalline silicon cell physical model,physical model and get the optimal single crystal silicon cell.It can also be applied to the construction of the best physical model of muti-junction photovoltaic cells by using the proposed parameter extraction algorithm and optimal model construction algorithm which is put forward in this paper.Key factors and output rules of the influence on the output characteristics of photovoltaic cell compounds would be analyzed detailedly through the muti-junction photovoltaic cell model compound optimal reconstruction and further to build the actual output characteristics of photovoltaic cell module and photovoltaic system simulation and prediction theory.Compared with the actual test results,the output characteristics predicted by theoretical models can better reflect the output rules of the actual module / system,so the analysis process and results can guide the practical application.In addition to the optimal parameter extraction and digital reconstruction of photovoltaic cells of different kinds in theory,this thesis is aimed at discussing and preparing a list of muti-junction photovoltaic cells in the compound muti-junction monochromatic light cell.The muti-junction monochromatic light cell is used as a special power supply by using a homogeneous junction cell with high photoelectric conversion efficiency under the narrow band spectrum energy.Through the use of high power semiconductor lasers mature as a monochromatic source,quartz fiber or air as power transmission medium,muti-junction monochromatic light cell can supply non contact energy in power,aerospace,military,and other special areas,which attracted more and more attention.This thesis focuses on the theoretical simulation of optimal structure and process of muti-junction monochromatic light cell.According to simulation results,the actual preparation of monolithic series-interconnected and monolithically stacked monochromatic light cell of two different structures,are discussed and summarized for the preparation of key technology in the process of researching the influence of different structure and different process steps prepared by monochromatic light output performance,based on these factors to further optimize the system structure and process steps by the cell,and the output characteristics in the same environment under the six node preparation of monochromatic light cells are tested and analyzed.The test results show that the transverse and vertical muti-junction monochromatic photovoltaic cells have very high conversion efficiency(monolithic series-interconnected >45% and monolithically stacked >55%),and the performance index reaches the advanced level in China.Finally,we further study the muti-junction monochromatic photo cell that can withstand higher optical power.We designed a large area muti-junction monochromatic photo cell that can withstand higher optical power,and tested its performance characteristics.A high-power monochromatic photocell module is designed and manufactured based on the large area high power muti-junction monochromatic photocell.The output and temperature characteristics of the module are tested and simulated.The test results show that the designed high-power monochromatic photocell module has more than 50% photoelectric conversion efficiency,and can output up to 20 W of electric power,supporting 50 W input optical power.All these results can provide a broader space for further application of muti-junction monochromatic light cell,and can be further developed with higher output voltage and high power applications for more flexible monochromatic light of muti-junction solar cells and other cutting-edge issues.Therefore,there is still much room for further development in the future.It is hoped that the work done in this paper will promote the further development of related technologies. |
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