大型双轴太阳跟踪器跟踪偏差的预测仿真研究

摘要

In a high concentrated photovoltaic system,the tracking deviation caused by the structural deformation of the solar tracker has a significant influence on the power generation efficiency of the solar tracking system.As the tracking deviation can not be directly measured,in this paper,a method of predicting and evaluating the tracking deviation by measuring the structural strain of the tracker is introduced.The structural strain of the tracker under different working conditions was measured for a large dual-axis solar tracker with an area of 103.5m2.The relationship between the structural strain and the deviation angle of the solar tracker was established based on the finite element simulation and data fitting.The tracking deviation of the solar tracker was predicted based on the measured structural strain.The results show that the maximum deviation angle of the predicted solar tracking device is 0.3 o,which is in accordance with the finite element simulation results and can effectively evaluate the effect of the tracker deviation on the power generation efficiency.%在高倍聚光太阳能发电系统中,太阳跟踪器结构变形导致的跟踪偏差对系统的发电效率影响十分显著.由于无法直接得到跟踪器的跟踪偏差,介绍了一种通过测量跟踪器的结构应变来预测跟踪偏差的方法,针对聚光面积为103.5m2的大型双轴太阳跟踪器,测量了跟踪器在不同工况下的结构应变,通过有限元仿真与数据拟合建立跟踪器结构应变与偏差角的关系,基于实测的结构应变预测跟踪器的跟踪偏差.研究结果表明,预测的太阳跟踪器最大偏差角为0.3.,与有限元仿真结果一致,能够有效评估跟踪器的跟踪偏差对发电效率的影响.