Parameter Identification of Photovoltaic Generators Using an Analytical Approach and Iterative Method

In this paper, a technique based on analytical formulation and iterative method is presented to estimate the five PV generator parameters from their experimental I-V curve and using the single diode model. This method calculates analytically the series resistance using three remarkable points of the I-V characteristics. The parallel resistance, the saturation current and the photo-current are calculated using a linear least squares method and solving a linear system of three equations. The ideality factor is extracted by an iterative procedure that optimizes the NRMSE value. The method is validated using experimental set of two PV generator cases: RTC commercial solar cell and KC200GT PV module. The results have shown best agreement with those published previously in the literature.