An Estimator of Solar Irradiance in Photovoltaic Arrays With Guaranteed Stability Properties

Abstract : Photovoltaic cells are characterized via a static relationship that describes their current-voltage relationship. This relationship is a complicated implicit algebraic equation that depends, in a nonlinear way, on two critical uncertain parameters: temperature and solar irradiance. The efficient operation of the panel relies on the knowledge of these key parameters. While it is technologically feasible to measure the former, a sensor for the latter is usually expensive and difficult to calibrate. In this paper, we propose a globally convergent estimator for solar irradiance which is developed using the principles of immersion and invariance recently reported in the control literature. To design the estimator, a suitable reparameterization of the current-voltage characteristic, which effectively exhibits a monotonic behavior, is introduced. The approach is validated through detailed computer simulations and experimental prototyping using real outdoor measurements.
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Submitted on : Wednesday, January 7, 2015 - 10:11:32 AM
Last modification on : Thursday, April 5, 2018 - 12:30:05 PM

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Miguel Carrasco, Fernando Mancilla-David, Romeo Ortega. An Estimator of Solar Irradiance in Photovoltaic Arrays With Guaranteed Stability Properties. IEEE Transactions on Industrial Electronics, Institute of Electrical and Electronics Engineers, 2014, 61 (7), pp.3359-3356. ⟨10.1109/TIE.2013.2281154⟩. ⟨hal-01100786⟩

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