聚光光伏发电可降低光伏发电成本, 提高太阳能电池的转换效率, 是光伏发电的发展趋势。Fresnel透镜是最常用的光伏聚光镜之一, 柱面Fresnel透镜其截面呈圆形, 与平板式Fresnel透镜相比, 可在一定程度上增加太阳光的收集角度。圆柱面Fresnel透镜由于棱镜单元非回转, 各棱镜单元参数各不相同, 其加工一般采用拼接方式, 不能实现一次成型加工。针对这些问题, 提出圆柱面Fresnel透镜一次成型的超精密加工方法, 研究加工过程中超精密机床运动参数与柱面Fresnel透镜几何参数之间的关系。对加工后的透镜进行了角度检测, 其角度加工误差小于0.02%, 说明加工方法具有极高的加工精度及准确性。

Concentrated photovoltaic power generation has become a trend of photovoltaic power generation. This method can reduce the cost of photovoltaic power generation and improve the conversion efficiency of solar cells. Fresnel lens is one of the most commonly used photovoltaic concentrators. Cylindrical Fresnel lens has a circular cross section. Compared with flat Fresnel lens, it can increase the tolerance angle of sunlight. Cylindrical Fresnel lens has different parameters due to non-rotational symmetry prism elements. Cylindrical Fresnel lenses are usually processed by splicing, which cannot achieve integral machine shaping in one step. A method of ultra-precision machining of cylindrical Fresnel lens by one-step forming is presented. The relationship between the motion parameters of ultra-precision machine tools and the geometric parameters of cylindrical Fresnel lens is studied. The angle measurement of the processed lens shows that the error of angle processing is less than 0.02%. This shows that the proposed processing method has very high accuracy and accuracy.