Solar simulator for concentrator photovoltaic systems

Instituto de Energía Solar, Universidad Politécnica de Madrid, ETSI Telecomunicación, Ciudad Universitaria, 28040 Madrid, Spain.
Optics Express (Impact Factor: 3.53). 10/2008; 16(19):14894-901. DOI: 10.1364/OE.16.014894
Source: PubMed

ABSTRACT A solar simulator for measuring performance of large area concentrator photovoltaic (CPV) modules is presented. Its illumination system is based on a Xenon flash light and a large area collimator mirror, which simulates natural sun light. Quality requirements imposed by the CPV systems have been characterized: irradiance level and uniformity at the receiver, light collimation and spectral distribution. The simulator allows indoor fast and cost-effective performance characterization and classification of CPV systems at the production line as well as module rating carried out by laboratories.

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    ABSTRACT: The following sections are included:* Introduction * The early development of CPV * Concentrator solar cells * Optics for photovoltaic concentrators * Photovoltaic concentration modules * Tracking systems for photovoltaic concentration * High-concentration systems * Rating and performance * Cost considerations * Conclusions * References
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    ABSTRACT: An indoor method is presented for the quantification of the current‐matching ratio of a multijunction cell within a concentrator under arbitrary spectral irradiance conditions. The cell current is measured across a very large spectral sweep to force the relevant subcells into a limiting condition. The light spectrum is monitored using component cells to avoid the need for a spectroradiometer and spectral response measurements. The method also provides an estimation of the current losses beyond the overall current mismatch, for example, losses produced in concentrators with chromatic aberration by the non‐uniformity of the incident spectrum across the cell. The method has been applied to a pair of refractive point‐focus concentrator systems; first, a 300X single‐stage Fresnel lens over a lattice‐matched GaInP/Ga(In)As/Ge triple‐junction cell and second, a 1000X two‐stage system with the same Fresnel lens over a homogenizing secondary lens that encapsulates a triple‐junction cell of the same kind but smaller. The experiment demonstrates that the single‐stage concentrator exhibits a higher sensitivity of the current mismatch to variations in the focal distance. Copyright © 2012 John Wiley & Sons, Ltd.
    Progress in Photovoltaics Research and Applications 11/2013; 21(7). DOI:10.1002/pip.2227 · 9.70 Impact Factor
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    ABSTRACT: A laboratory PV generator is presented in this paper, whose target application is the dynamic test, in controllable conditions, of MPPT algorithms or circuits. The system comprises three main components: a solid state lamp, its power supply and control electronics, and a PV module. The instrument uses the controlled light emission of the solid state lamp to induce photogeneration in the PV module. The LED drivers are designed so that the incident radiation intensity can be modulated within a relatively large bandwidth (in the kHz range). Thus, the PV module power output can be precisely controlled and, in particular, relatively rapid and pre-determined variations can be induced. These features allow the implementation of repeatable dynamic tests of any converter connected to the PV module and, in particular, of its built-in MPPT strategy. From this standpoint, the instrument outperforms both existing optical solar simulators, e.g. based on gas discharge or incandescent lamps, and electrical simulators, based on suitably controlled power supplies. Indeed, the former offer very limited dynamic performance, the latter only replicate the static PV generator characteristics. To prove the effectiveness of the instrument, a ripple correlation MPPT strategy is tested. Experimental results are presented.
    2013 Brazilian Power Electronics Conference (COBEP 2013); 10/2013

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