An Efficient Iterative Method for Extracting Parameters of Photovoltaic Panels with Single Diode Model

In this paper, a five parameter extraction method for a single diode model of photovoltaic panels is proposed. The method is based on an iterative algorithm and able to estimate the electrical parameters from the panel's datasheet information. Three steps are used to extract the five single diode model parameters. In the first step, we estimate analytically the ideality factor using the different information from the panel's datasheet. In the second step, we formulate three analytical equations that permit us to find the parallel resistance, the saturation current and the photo-current as function of the series resistance and the ideality factors. The third step allows us to determine the optimal value of the series resistance using an iterative procedure that minimizes the error between the theoretical and the experimental maximum power values. The proposed method is applied to the polycrystalline silicon photovoltaic KC200GT solar module under standard test conditions (STC) and under different irradiations and temperatures. The results show a good agreement between the simulated data and the experimental measure extracted from datasheet.