针对现有阴影遮挡效率算法多将定日镜镜面假设为理想单一反射面、未考虑由多块子镜组成的复合结构及子镜间隙所导致的计算误差问题,基于传统的平面投影法提出一种新型的计算方法。该方法利用扫描线算法的特性,能灵活计算任意多边形（含组合多边形）的定日镜的阴影遮挡效率,且可规避了传统平面投影法的一些缺陷。将该方法应用到组合镜面上,相较于将定日镜视作完整一块镜面的处理,在计算结果的精度上有提升。此外,该计算模型的输出结果经过实际镜场的测试验证,实地采样的定日镜的阴影遮挡效率与算法的输出结果相对误差均小于1%。
Abstract
To address the calculation error caused by existing shading and blocking efficiency algorithms that typically assume the heliostat mirror as an ideal single reflective surface, without considering the composite structure of multiple sub-mirrors and the gaps between them, this paper proposes a novel computational approach based on traditional planar projection methods. Utilizing the characteristics of the scan-line algorithm, this method can flexibly calculate the shading and blocking efficiency for any polygonal heliostats, including those formed by combined polygons, thereby avoiding some shortcomings of conventional planar projection techniques. When applied to composite mirror surfaces, this method yields more precise results compared to treating the heliostat as a single, continuous reflective surface. Furthermore, the output from this computational model has been validated through field visits, where the measured shading and blocking efficiency of several actual heliostats was found to have a relative error of less than 1% when compared to the algorithm’s predictions.
关键词
太阳能热发电 /
定日镜 /
效率 /
阴影与遮挡 /
定日镜镜面形状 /
平面投影法
Key words
solar thermal power generation /
heliostats /
efficiency /
blocking and shading /
heliostat surface shape /
planar projection
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