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在很多国家,太阳能越来越受青睐,原因是太阳能电池模块和系统的成本迅速降低,与矿物燃料发电相比,具有极大的价格竞争优势。一些国家已经实现了电网平价,这意味着使用太阳能或其他可再生能源,发电成本将等于或低于传统矿物燃料来源。在一些传统电网难以到达的地区,太阳能已经成为一种重要的替代能源。
太阳能电池系统使用一组太阳能电池板,通过光电作用将太阳光转化成电能。每块电池板都由多个太阳能电池模块组成,这些太阳能电池模块又由一个太阳能电池矩阵组成,太阳能电池会将太阳辐射转化为电力。任何太阳能电池发生故障,都会导致发电量降低,造成电力输出量的损失。
当一块电池被遮挡或不工作时,这块电池不但不能发电,还会消耗相邻串联太阳能电池的能量。太阳能发电厂中可能会有数千块太阳能电池板,若要单独对每块电池板都进行电力测试,定会非常耗时且繁琐。本应用指南将要介绍如何使用数据采集系统和热成像方法来测试太阳能电池和太阳能模块。
太阳能电池和模块 测试中的温度测量
在太阳能电池和模块测试中,紧靠电池或被测模块的 I-V 曲线是远远不够的。通常还需要进行温度测量,和对已校准参考电池的测量。温度会直接影响电池或模块的输出电力,因此您在测试期间需要进行温度测量,以便充分了解所有的测试条件。要测量太阳能电池或模块的供电光源的有效性,往往需要用到经过校准的参考电池。图 1 是太阳能模块测试装置的一个示例。该装置使用了一个开关测量单元,避免了再使用一套成本高昂的冗余测量设备。另外,还可通过开关转换配置来并行测试多个太阳能电池或模块。
是德科技提供了三个产品系列来满足您的太阳能测试开关需求:34980A 多功能开关/测量单元、34970A 数据采集开关单元和 L44xxA 系列开关模块
用于大型太阳能模块 测试的温度测量
由于单个热电偶传感器的覆盖范围有限,测试较大的太阳能模块时,就需要在巨大的太阳能模块上安装数百个热电偶传感器。要监控大型太阳能模块的温度,更有效的方法应该是使用高精度热成像仪。图 2 示出了使用 Keysight U5850 系列 TrueIR 热成像仪在过热太阳能模块电池上检测到的热点。
请下载此应用指南,了解更多知识。
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