Design And Optimization Of Tilt Uniaxial Tracking System For Bifacial Photovoltaic Module

In recent years,photovoltaic power generation technology has developed rapidly.However,due to seasonal and diurnal changes,the incident angle of the sun’s rays changes periodically,which in turn affects the output of photovoltaic power generation.Therefore,based on the relative trajectory of the sun,this paper adopts research methods such as theoretical analysis,experiment and simulation calculation to carry out the design and optimization of the oblique single-axis tracking system of Bifacial photovoltaic modules.First,based on the relative movement of the sun,the position data of the photovoltaic power generation system relative to it is constructed.And using the drive motor and the displacement signal controller to design a single-axis tracking system for Bifacial photovoltaic modules.Based on the above-mentioned development system,an experimental study on the comparison of the power generation capacity of the single-axis tracking system of single/Bifacial photovoltaic modules was carried out.The results show that the maximum gain in sunny days is 0.733kwh/kwp,which is 9.3% more than single-sided photovoltaic modules,and the maximum gain power in summer is 38.91 kwh/kwp,which is 8.73% more than single-sided photovoltaic modules.Then,using Matlab software to establish a single-axis tracking photovoltaic power generation mathematical model,by studying the change law of different parameters on the output of photovoltaic power generation.The genetic algorithm is introduced into the model to optimize the best tilt angle of the tracking system.The optimization results show that the annual power generation of the oblique single-axis tracking system with the best tilt angle of the year is 1.86% more than that of the conventional single-axis tracking system.The annual power generation of the system that adjusts the optimal tilt angle according to the season is 3.26%more than the annual power generation of the flat single-axis tracking system.Finally,establish the LCOE economic model of the Bifacial photovoltaic power generation system,and carry out the comparative study of the optimized oblique single-axis tracking system and the LCOE of other photovoltaic support systems.The research results show that the minimum LCOE of the optimized oblique single-axis tracking system is 0.4415 RMB/k Wh,the initial investment cost accounts for a relatively large 68.6% of the total cost,and the subsequent maintenance cost accounts for a relatively small 31.4%.In addition,the sensitivity analysis of the influencing factors of the LCOE of the oblique uniaxial tracking system shows that the price of photovoltaic cells,the tracker,the inflation rate and the discount rate are more sensitive to the influence of the LCOE.