1000倍聚光的光伏聚光器的非成像设计

Nonimaging design of a high efficient photovoltaic concentrator with 1000 X concentration

摘要:

为了设计一种应用于高倍聚光光伏系统中的具有高光学效率、轻量化、低高宽比和良好的光照均匀性的高倍聚光器,采用SMS(simultaneous multiple surfaces)设计方法,应用光束扩展原理和边界光线原理,同时设计具有全内反射功能的光学表面和具折射功能的光学表面,编写数值计算程序,优化各光学表面的轮廓,完成了包含主透镜和二次透镜的高倍聚光器的设计.优化后的高倍聚光器具有1 000倍聚光、小于0.4的高宽比和1.5°的集光角.光线模拟分析结果表明:该聚光器可实现高于85%的光学效率和很好的光照均匀性,应用于高倍聚光光伏系统时易于封装,且在配置两轴跟踪系统的条件下可实现高效率聚光.

Abstract:

To design a high gain concentrator with high efficient,light weight,low aspect ratio and good uniformity of solar cell illumination for a high concentration photovoltaic system,the SMS(simultaneous multiple surfaces) method was used for simultaneous design of total internal reflection optical surfaces and refraction optical surfaces on the basis of conservation of etendue and edge-ray principle.In realizing that,the optical surface profiles of the concentrator was calculated and optimized using numeric method to complete the design of the concentrator including a primary lens and a secondary lens.The optimized concentrator has 1 000 X concentration,an aspect ratio less than 0.4 and acceptance angle of 1.5°.Moreover,the result of ray tracing of the concentrator indicates that high efficient more than 85% and good uniformity of the solar cell illumination can be achieved.Therefore,when the designed concentrator is applied to a high concentration photovoltaic system with a 2-axis tracking system,an easy assembly process and high optical efficient can be realized.