随着基于III-V族多节高效聚光太阳电池(MJ)的快速发展，高聚光光伏（HCPV）的技术和经济优势逐渐凸显出来，使其发电成本有望接近常规发电成本。但在HCPV系统中，聚光系统的成本远高于MJ的成本，因此，开发价廉、高效、可靠、实用的高聚光系统是降级HCPV发电成本的有效途径之一。本课题提出了基于水平单轴跟踪Cassegrain线聚光器和三维CPC的高聚光光伏系统，Cassegrain线聚光器由初级抛物聚光器（PPC）和二次反射镜面（SM）组成，三维CPC为基于全内反射的轴向对称复合抛物聚光器（CPC）和横向非对称CPC交叉所形成的几何结构（TIR-CACPC）,系统吸取了Cassegrain光学系统向下聚光、水平轴跟踪结构简单和TIR-CACPC高聚光的优点。课题将围绕系统的优化设计、光能传输、光电转换和MJ热环境相关的科学问题开展理论和实验研究。

With the rapid development of multi-junction (MJ) solar cells based on III-V semiconductors, the cost and technical advantages of high concentrating photovoltaic (HCPV) over plat-plate PV have been emerging, and this make it possible that the cost of electricity from HCPV is close to the cost of conventional electricity generation in the near future. However, the cost of concentrators is usually much higher than that of MJ in HCPV systems, thus, the development of cheap, high efficiency, reliable and practical concentrators with a high concentration is one of effective way to reduce the cost from HCPV. In this proposal, a HCPV based on a linear Cassegrain concentrator tracking the sun with a horizontal single-axis and three-dimensional CPCs is proposed where the Cassegrain concentrator consists of a primary parabolic reflector (PPC) and a secondary mirror and the total internal reflection based 3D-CPC is shaped by a symmetric CPC oriented in direction of the sun-tracking axis crossing an asymmetric CPC oriented in the direction perpendicular to the sun-tracking axis (TIR-CACPC). The proposal system shares advantages of beam-downwards focusing in Cassegrain optical systems, simple structure in horizontal single-axis sun-tracking and high concentration in the TIR-CACPC. The program will focus on theoretical and experimental investigations on issues related to the design optimization of the system, characteristics of energy transfer and photovoltaic conversion as well as thermal environment in MJ.