塔式太阳能电站三轴定日镜装置研究

Study on three-axis heliostats for solar-thermal power stations

针对现有塔式太阳能定日镜装置在极端天气下稳定性差的问题,本文提出采用三轴支撑方式的定日镜装置,通过有限元分析方法确定了3个支撑轴最优位置,根据地理位置和时间推算太阳的高度角和方位角,结合反射定律得到控制定日镜平面的最佳空间角度。在优化布置支撑轴的基础上,对支撑轴的高度控制量进行推导计算,并设计了相应的定日镜控制系统。最后,以某塔式太阳能电站实际数据为例进行试验验证,结果表明本文提出的定日镜控制系统正确可行。

The existing heliostats have the disadvantage of poor stability in extreme weathers. To solve this problem, a three-axis supporting heliostats is proposed. The optimal positions of the three supporting poles are ascertained by using the finite element method. The height angle and azimuth angle of the sun are deduced according to the geographical position and time, and combining with the law of reflection, the optimum spatial angle for controlling the plane of the heliostats is obtained. Based on optimizing the arrangement of the position of the support shafts, the given value of the height control of the support shafts is deduced, and the corresponding control system is designed. Finally, by taking the actual data of a tower type solar-thermal power station as the example, the verification experiment is carried out, and the results show that the heliostats control system presented in this paper is correct and feasible.