塔式太阳能发电系统镜场跟踪角分析

Analysis of the Tracking Angle of Mirror Field for Solar Power Tower Plant

塔式太阳能聚光热发电系统是大规模太阳能热发电系统中极具吸引力的一种方式,具有许多优越的性能是线聚焦系统所没有的,塔式系统的关键技术之一是定日镜的跟踪控制。本文首先利用矢量法,推导出基于镜场坐标的跟踪角,入射角算法,以方便系统如镜场余弦系数,阴影与遮挡系数等光学效率的分析,然后对镜场中定日镜的跟踪角的变化趋势及速度进行分析,进一步可方便跟踪控制策略的定制以及机械结构的设计,最后针对定日镜跟踪控制器的经纬度设置误差,对镜场的定日镜跟踪角误差进行了统计分析,以利于跟踪控制区域的确定。

The solar power tower system is an attractive method for electrical power generation on a large-scale, and offers significant performance advantages over line-focus systems. The tracking control of heliostats is one of key technologies of power tower system. Firstly, this paper presents the formulae of tracking angle and incidence angle of heliostats based on position in mirror field by vector analysis, which can be made use of optical efficiency analysis such as cosine factor and shading and blocking factor. Then, the changing trend and speed of heliostats＇ tracking angle was analyzed, furthermore, which is convenient for customizing tracking strategy and designing mechanical structure of heliostats. Finally, statistical analysis of heliostat tracking angle error as a result of tracking controller＇ longitude and latitude setting error was done, which can be used of determining control region.