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Temperature of solar cells with regard to photoactive and non-photoactive light absorption in concentrator PV modules

机译:集中器PV模块中与光敏和非光敏光吸收有关的太阳能电池温度

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摘要

A new method has recently been proposed by us for accurate measurement of the solar cell temperature in any operational regime, in particular, at a maximum power point (MPP) of the I-V curve (T-p-n(MPP)). For this, fast switching of a cell from MPP to open circuit (OC) regime is carried out and open circuit voltage V-oc is measured immediately (within about 1 millisecond), so that this value becomes to be an indicator of T-p-n(MPP). In the present work, we have considered a practical case, when a solar cell is heated not only by absorption of light incident upon its surface (called "photoactive" absorption of power), but also by heat transferred from structural elements surrounding the cell and heated by absorption of direct or diffused sunlight ("non-photoactive" absorption of power with respect to a solar cell). This process takes place in any concentrator module with non-ideal concentrators. Low overheating temperature of the p-n junction (or p-n junctions in a multijunction cell) is a cumulative parameter characterizing the quality of a solar module by the factor of heat removal effectiveness and, at the same time, by the factor of low "non-photoactive" losses.
机译:我们最近提出了一种新方法,用于在任何操作方式下,特别是在I-V曲线的最大功率点(MPP)(T-p-n(MPP))下精确测量太阳能电池温度。为此,将电池从MPP快速切换到开路(OC)状态,并立即(约1毫秒内)测量开路电压V-oc,以使该值成为Tpn(MPP)的指标。 )。在当前的工作中,我们考虑了一个实际情况,即不仅通过吸收入射在其表面上的光(称为“光敏”吸收功率),而且还通过从围绕电池的结构元件传递的热量来加热太阳能电池。通过吸收直接或扩散的阳光而被加热(相对于太阳能电池“非光敏”吸收功率)。此过程发生在任何带有非理想集中器的集中器模块中。 pn结(或多结电池中的pn结)的低过热温度是一个累积参数,它通过除热效率的因素来表征太阳能电池组件的质量,同时,通过低的“非光敏性”来表征太阳能电池组件的质量。损失。

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