Identification of Photovoltaic Arrays' Maximum Power Extraction Point   via Dynamic Regressor Extension and Mixing
  This paper deals with the problem of identification of photovoltaic arrays' maximum power extraction point---information that is encrypted in the current-voltage characteristic equation. We propose a new parameterisation of the classical five parameter model of this function that, combined with the recently introduced identification technique of dynamic regressor extension and mixing, ensures a fast and accurate estimation of all unknown parameters. A concavity property of the current-voltage characteristic equation is then exploited to directly identify the desired voltage operating point. Realistic numerical examples via computer simulations are presented to assess the performance of the proposed approach. 
Anton Pyrkin and Fernando Mancilla-David and Romeo Ortega and Alexey   Bobtsov and Stanislav Aranovskiy
cs.SY