Linearity Testing of Photovoltaic Cells (Poster)
Linearity Testing of Photovoltaic Cells (Poster)
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光伏电池的线性测试（海报）
DOI：
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发表时间：
2006
期刊：
影响因子：
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通讯作者：
D. Nalley
中科院分区：
文献类型：
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作者：
K. Emery;S. Winter;S. Pinegar;D. Nalley
国际光伏标准要求参考器件的短路电流或响应与总辐照度呈线性关系。认可的校准实验室不能假设他们的参考设备是线性的，除非另一个认可的实验室进行了测量。NREL PV性能实验室通过了ISO 17025认证，可进行一级参比电池、二级参比电池和二级模块校准。有限的劳动力资源需要开发一种技术来确定线性，而不需要大量的劳动力或技术技能。双灯法对光源的光谱或空间不均匀性随辐照度的变化不敏感。它假设温度不随辐照度而变化，并且光源光谱类似于太阳光谱。这个要求仅仅是因为光电流中的非线性机制是波长相关的。例如，激光器可以将相同的器件显示为线性或非常非线性，其中辐照度取决于波长。双灯法假设单独照射样品时的灯强度与两个灯照射样品时的灯强度相同。室内光的存在仅限制了可评估的最低辐照度。与其他方法不同，双灯法不允许对电流进行非线性效应校正。当与用于大容量校准实验室的其他方法相比时，双灯方法最吸引人的方面是它快速，并且不需要操作员干预来改变辐照度，并且操作员难以犯会影响结果的错误。«少
International PV standards require that the short-circuit current or response of the reference device be linear with total irradiance. Accredited calibration laboratories can not assume that their reference device is linear unless another accredited laboratory has performed the measurement. The NREL PV performance laboratory is ISO 17025 accredited for primary reference cell, secondary reference cell and secondary module calibrations. Limited labor resources necessitated the development of a technique to determine linearity without taking significant labor or technical skill. The two-lamp method is insensitive to the spectrum of the light or spatial nonuniformity changing as the irradiance is varied. It does assume that the temperature does not change with irradiance and that the light-source spectrum resembles the solar spectrum. This requirement is only because nonlinear mechanisms in the photo-current are wavelength dependent. A laser for example may show the same device as linear or very nonlinear with irradiance depending on the wavelength. The two-lamp method assumes that the lamp intensities when individually irradiating the sample are the same as when both lamps irradiate the sample. The presence of room light only limits the lowest irradiance that can be evaluated. Unlike other methods, the two-lamp method does not allow the current tomore » be corrected for nonlinear effects. The most appealing aspect of the two-lamp method when compared with other methods for a high-volume calibration laboratory is that it is fast and does not require operator intervention to change the irradiances and is difficult for the operator to make mistakes that would affect the outcome.« less