Simulation and Experimental Results for a Single Diode Photovoltaic Model using Newton-Raphson Parameter Estimation Method: doi: 10.14456/mijet.2018.6

Chawyuyu Khin; Panhathai Buasri; Apirat Siritaratiwat; Rongrit Chatthaworn

Authors

Chawyuyu Khin Khon Kaen University
Panhathai Buasri Khon Kaen University
Apirat Siritaratiwat Khon Kaen University
Rongrit Chatthaworn Khon Kaen University

Keywords:

Modeling, monocrystalline, Newton-Raphson (NR), series resistance, shunt resistance

Abstract

Modeling a photovoltaic (PV) module with a single diode model is the simplest and most popular model for representing the commercial PV products. However, to achieve a high accuracy PV model, several parameters are involved. Unfortunately, there are only some parameters provided from the manufacturers. This paper proposes the method to estimate these parameters using MATLAB program. There are five parameters needed for simulation in MATLAB, which are the photon current (I_ph), diode ideality factor (a), reverse saturation current (I_o), series resistance (R_s) and shunt resistance (R_sh). Among these parameters, series and shunt resistances are the most difficult and thus the Newton-Raphson (NR) iterative method is used for capturing the values for these parameters in MATLAB. A 5 W monocrystalline module was used as a reference module in this work. It was found that the NR method provided a fast and reliable computing method for estimating these two parameters of the PV module. Finally, five parameters estimation with NR and adapted ideality factor method is highly recommended for high accuracy estimation of electricity generation from a single diode solar PV model.

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