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CPV solar simulator
The objective is to measure the IV curve of a concentrator module under reference illumination and temperature. These are the steps for the measurement: 1. The module is positioned on a fixed assembly, which is perpendicular to the light beam. Electrical connections for measuring its voltage and current are made. 2. The module is biased at a given voltage of the IV curve, and then the Xenon flash lamp is triggered. Its divergent light is reflected by the collimator mirror, producing a parallel light beam over the module. 3. During the flash illumination, current and voltage of the module are measured, together with the signal of a light sensor. This light sensor defines the irradiance level at every time, so it is identified the current and voltage point for the desired irradiance level, i.e. 850 W/m2. 4. This measurement is repeated at as many voltages of the IV curve as desired (5 or 6 points for a production line typically). The flash rate in our system is 4 seconds (time between flashes). 5. The IV curve is constructed with these points and the most important parameters are extracted: maximum power point, open-circuit voltage, short-circuit current, fill-factor and electrical efficiency. Image credit: Cesar Dominguez
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