Precise Sun-tracking Control of Heliostats Based on a Sun’s Image Reference System
Solar tower power plant is the widest market prospect type in large-scale solar power plants during the next decades.Heliostats are the most important components in this system.To solve the problems in the sun-tracking,concentrating control and low dynamic precision of the heliostat clusters system,the nonlinear kinematical model of a heliostat is developed based on analysis of the two-axis rotation sun-tracking mechanism and property.The motion trajectory information of a single heliostat is sampled by using a suns image reference system combined with machine vision-based method.Nonlinear optimization is proposed to get the best suns image fitting to achieve the heliostat model parameters automatic intelligent calibration,which overcome the sun-tracking and concentrating precision drift caused by mechanical wears of the heliostat,the environmental and seasonal variations and achieve the high focusing rate and high efficiency of the energy collecting of the large-scale heliostat clusters.The effectiveness of proposed modeling,calibration,and control theory of heliostats are verified through theoretical simulation and experimental researches.
Concentrating Solar Power Heliostat Sun’s image reference system Sun-tracking Control
Zhu Xuemei Mi Xiaoling Lin Kaizhi Huang Wenjun
School of Electrical and Automation Engineering,Nanjing Normal University,Nanjing 210042,China Zhejiang Supcon Solar Technology Co.,Ltd.,Hangzhou 310052,China Institute of Cyber-System and Control,Zhejiang University,Hangzhou 310027,China
国际会议
长沙
英文
2745-2748
2014-05-31（万方平台首次上网日期，不代表论文的发表时间）