S ingle-diode and t wo

This paper presents a detailed eplaination about various characteristics of ideal single diode, practical single diode and two diode equivalent circuit models realized for modeling of solar photovoltaic cell. Then it presents non-linear mathematical equations necessary for producing I-V and P-V characteristics from a single diode model. A flowchart has been made for estimation of solar cell output current, for single diode and two diode model, using Newton-Raphson iterative technique which is then programmed in MATLAB script file accordingly. A typical 120W polycrystalline solar module specifications have been used for model accuracy evaluation. The characteristic curves were obtained with the use of manufacturer`s datasheet and it shows the precise correspondence to both the models.