室内聚光测试系统的研究

Study of Indoor concentration Test System

为弥补因太阳模拟器光线发散角大、测试口径小不适用于光伏聚光系统测试的缺陷,设计了大口径、高平行度的室内聚光测试系统。另外还提出了一种新的聚光测试方法:分立光谱局部测量法。首先选二阶菲涅耳聚光系统为测试对象,利用单色光局部测量法测试该聚光系统的聚光效率,然后利用各种单色光的权重与聚光效率计算聚光系统的平均聚光效率,最后将实验结果与模拟结果进行对比分析。二阶菲涅耳聚光系统模拟聚光效率为88.623%,聚光测试系统测得聚光效率为85.45%,二者的聚光效率相差3.173%,透射比和光斑照度的均匀性均比较接近。聚光效率的差异主要来源于聚光系统的加工制作误差和测量误差。通过实验数据分析,验证了室内聚光测试系统的科学性与可行性。室内聚光测试系统光线发散角为0.267°,与太阳光发散角相匹配,出光口径为145 mm,可实现大口径聚光系统的性能测试。该系统结构简单、成本低,在太阳能聚光领域内有广阔的应用前景。

Because of the large divergence angle and small test caliber, the solar simulator is not suitable for the test of photovoltaic concentration system. In order to make up this weakness, an indoor concentration test system with a large caliber and a high parallelism is designed. A new concentration test method discrete spectral local measurement method is proposed. Firstly, two-stage Fresnel concentration system is chosen as a test object and monochromatic light local measurement method is used to test its concentration efficiency. Then the average concentration efficiency is calculated according to the weight and concentration efficiency of monochromatic light. Finally, the experimental results are compared with the simulated results. The simulated concentration efficiency is 88. 623 %, and the measured concentration efficiency is 85.45 %, with the difference of 3. 173 %. The transmittance and the uniformity of concentration spot are quite close. The difference of concentration efficiency mainly come from manufacturing error and measuring error. The scientificity and feasibility of the indoor concentration test system are confirmed through the experimental data analysis. The light divergence angle of indoor concentration test system is 0. 267°, which can match sunlight divergence angle, and its 145 mm caliber can test the performance of concentration system with the large caliber. Indoor concentration test system with simple structure and low cost will have broad application prospects in solar-energy concentration field.