Concentrating photovoltaic (CPV) systems require less area of the solar cell while achieving a high efficiency. One of the development factors in the CPV includes the irradiance uniformity over the solar cell. To overcome this issue, a parabolic trough-based optical design is proposed using two nonimaging secondary reflectors: reflective grooves and compound parabolic concentrator (CPC). The reflective grooves convert the line focus to a square shape irradiance distribution, and the CPC is used for redirecting the rays to the receiver. The proposed system delivers the concentrated light over the solar cell having a size of 30 × 30 mm2 at the center of the trough. The CPV system reduces the number of cells compared with conventional trough-based CPV systems by attaining the concentration ratio of 285. The results indicate that the system has achieved an optical efficiency of 60% at an acceptance angle of ±2 deg. The detailed optical design and raytracing simulation are presented showing that the proposed concentrator can achieve significantly higher overall concentration while maintaining irradiance uniformity.

中文翻译：

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基于中心接收槽的 CPV 系统的光学设计

聚光光伏 (CPV) 系统需要更少的太阳能电池面积，同时实现高效率。CPV 的发展因素之一包括太阳能电池上的辐照均匀性。为了克服这个问题，提出了一种基于抛物槽的光学设计，使用两个非成像二次反射器：反射槽和复合抛物面聚光器 (CPC)。反射槽将线焦点转换为方形辐照分布，CPC 用于将光线重定向到接收器。所提出的系统将集中的光传送到位于槽中心的尺寸为 30 × 30 mm2 的太阳能电池上。与传统的槽式 CPV 系统相比，CPV 系统通过达到 285 的聚光比减少了电池数量。结果表明，该系统在±2度的接受角下实现了60%的光学效率。详细的光学设计和光线追踪模拟表明，所提出的聚光器可以实现显着更高的整体浓度，同时保持辐照均匀性。