方位-俯仰双轴跟踪定日镜的跟踪实践

TRACKING PRACTICE OF AN AZIMUTH-ELEVATION DUAL-AXIS HELIOSTAT

介绍方位-俯仰双轴跟踪的线聚光定日镜的硬件结构、控制系统、跟踪实验方法,并详细介绍为提高定日镜跟踪精度所进行的跟踪实验过程。跟踪实验过程,主要应用研究基于几何误差参数模型的跟踪纠偏方法、叠加时变纠偏角度的纠偏方法以及修改跟踪目标点位置的纠偏方法。实验数据显示,综合运用基于几何误差参数模型的跟踪纠偏方法和修改跟踪目标点位置的纠偏方法能有效提高定日镜跟踪精度。此外,还对纠偏策略无法消除残余跟踪误差的原因进行研究。

This paper firstly introduces the hardware structure,control system and experimental methods of the linear heliostat with an azimuth-elevation dual-axis sun tracking mode,and then the tracking experimental process to improve the heliostat tracking accuracy is described in detail.The tracking experimental methods in this paper include the heliostat tracking error correction strategy based on the geometrical error parameter model,the error correction strategy with timevarying tracking angle corrections and also aiming point shifting strategy.The experimental data show that the combination of the geometrical error parameter model and the aiming point shifting strategy can significantly improve the heliostat tracking accuracy and reduce the tracking errors.This paper also analyzes the causes of the always-existing residual tracking errors for the tracking error correction strategies.