Model Analysis And Performance Optimization Of Dish Concentrator Photovoltaic System

In recent years,the dish-type concentrated photovoltaic power generation system has attracted the attention of many scholars due to its high power generation efficiency.This paper establishes a model of the dish-type concentrating solar photovoltaic power generation system from the perspectives of optics,heat,and electricity,and studies the key factors that affect its power and efficiency,specifically:(1)Establish a 1:1 equal-scale optical model of the dish-type concentrating photovoltaic system,and perform optical simulation on it with ZEMAX software.The influence of the secondary optical unit-the homogenization tube on the shape of the spot is analyzed,and the results show that the regular rectangular homogenization tube can greatly improve the uniformity of the spot.(2)For disc-type concentrating photovoltaic systems with high concentration multiples,the energy flow density per unit area of the battery surface is relatively high,which results in high battery operating temperature,lower battery efficiency,and may even damage or burn the battery.In response to this problem,this paper studies the battery cooling system.COMSOL is used to design and simulate the battery cooling system.The simulation results are highly consistent with the measured results.The results show that a reasonable cooling channel design can effectively reduce the working temperature of the battery surface.(3)The dual-diode equivalent circuit model is used to model and simulate the array battery.In the process of actual measurement,the phenomenon of mismatch loss of the battery array was discovered,which was manifested as multiple steps rather than a smooth curve in the measured IV curve.This phenomenon was analyzed and theoretically explained.(4)The power generation of the battery is analyzed when the tracking deviation angle is 0 degrees,0.02 degrees,and 0.2 degrees.It is found that when the tracking deviation angle is close to 0 degrees,regardless of whether there is a secondary homogenization unit,under the same Gaussian spot illumination,the non-uniform size dense array module has better output performance than the traditional uniform size module.Therefore,under the condition that tracking accuracy can be ensured,a dish-type system with dense array modules of non-uniform size can be considered as a better performance alternative to the traditional uniform-size modules.