Angular distribution of annual collectible radiation on solar cells of CPC based photovoltaic systems
Angular distribution of annual collectible radiation on solar cells of CPC based photovoltaic systems
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基于 CPC 的光伏系统太阳能电池年可收集辐射的角分布
DOI：
10.1016/j.solener.2016.06.046
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发表时间：
2016-10
期刊：
影响因子：
6.7
通讯作者：
Runsheng Tang
中科院分区：
文献类型：
--
作者：
Mingjiu Yu;Yamei Yu;Runsheng Tang
为了研究复合抛物面聚光器（CPC）的几何形状对CPC基光伏系统（CPV）性能的影响，有必要确定CPC基光伏系统太阳能电池上全年可收集辐射的角分布，因为太阳能电池的光伏转换效率对太阳光线的入射角非常敏感，特别是对于大于65°的入射角。本文提出了一种估算CPC-θ e吸收器上年可收集辐射及其角分布的数学方法，其中太阳光线的出射角被限制在θ e以内，以使入射辐射超过其接收角。计算表明，给定接收半角（θ a），全CPC的年可收集辐射-θ e在东西方向上（EW-CPC-θ e）随θ e的增大而增大;而对于给定θ a和几何浓度Ct的截断EW-CPC-θ e，当θ e< 90°时，EW-CPC-θ e和EW-CPC-90的年辐射量几乎相同，没有出射角限制的那个，甚至稍微高一点。结果表明，对于南北向CPC-θ e（NS-CPC-θ e），年可收集辐射的角分布可以认为是各向同性的;而对于EW-CPC-θ e，角分布取决于其几何形状和倾角调整策略，但具有各向异性。结果还表明，在3种倾角下，孔径倾角每年调整4次的情况下，EW-CPV-θ e的年输出功率随θ e的增大而减小，除全EW-CPV-θ e外，EW-CPV-θ e的年输出功率始终高于EW-CPV-90。
To investigate effects of the geometry of compound parabolic concentrators (CPCs) on the performance of CPC based photovoltaic systems (CPVs), it is necessary to determine the angular distribution of the annual collectible radiation on solar cells as the photovoltaic conversion efficiency of solar cells is highly sensitive to the incident angle of solar rays, especially for radiation incident at the angle larger than 65°. In this work, a mathematical procedure is suggested to estimate the annual collectible radiation and its angular distribution on the absorber of CPC-θ e where the exit angle of solar rays is restricted within θ e for the incoming radiation over its acceptance angle. Calculations show that, given the acceptance half-angle (θ a), the annual collectible radiation of full CPC-θ e oriented in the east–west direction (EW-CPC-θ e) increases with the increase of θ e; whereas for truncated EW-CPC-θ e with given θ a and geometric concentration (C t), the annual radiation collected by EW-CPC-θ e with θ e< 90° is almost identical to that by EW-CPC-90, the one without exit angle restriction, even slightly higher. Results indicate that, for CPC-θ e oriented in the north–south direction (NS-CPC-θ e), the angular distribution of annual collectible radiation can be regarded to be isotropic; whereas for EW-CPC-θ e, the angular distribution is dependent on its geometry and strategy of its tilt-angle adjustment but is anisotropic. Results also reveal that the annual power output from EW-CPV-θ e decrease with the increase of θ e and always higher than that from EW-CPV-90 except full EW-CPV-θ e in the case of aperture’s tilt-angle being yearly adjusted four times at three tilts.
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