Accelerating the Convergence in the Identification of PV Cells Parameters

The current trend in energy sources is towards the large-scale use of small-scale photovoltaic (PV) systems for local energy supply. The today's common commercial PV systems today include PV cells of various manufactures and origins based mostly on a large-area p-n junction made of silicon. The characteristic equation describes the non-linear dependence between current and voltage and the parameters values of the characteristic equation define the working regime of the PV system. Parameters identification involves a series of iterations in which the sum of squared errors is minimized (and thus the chance of observation is maximized). A large number of iterations are required if the optimization follows the usual course from the solution proposed by the vertical offsets to the perpendicular offsets. In the present work, an intermediate solution is used to speed up the convergence.