IOSR Journal of Electrical and Electronics Engineering (IOSR-JEEE) e-ISSN: 2278-1676,p-ISSN: 2320-3331, Volume 12, Issue 6 Ver. II (Nov. – Dec. 2017), PP 45-51 www.iosrjournals.org DOI: 10.9790/1676-1206024551 www.iosrjournals.org 45 | Page Modelling Photovoltaic System Using Bond Graph Method: A Comparative Study *Zakaria Khaouch 1 , Mustapha Adar 1 ,Youssef Najih 1 ,Mustapha Zekraoui 1 , Nourreeddine Kouider 1 ,Mustapha Mabrouki 1 1 Industrial Engineering Laboratory, Faculty of Science and Technology, Sultan Moulay Slimane University, Beni Mellal, Morocco. Corresponding Author: *Zakaria Khaouch Abstract: Bond Graphs (BG)are perceived as a promising possibility for modeling complex physical systems. This paper explores its potential by undertaking the analysis, modeling and design of a photovoltaic (PV) solar system. A model of a photovoltaic solar system is performed using Bond Graph Approach based on a 1-diode/2- resistors (1D & 2R) circuit model. The main aim of this model is to study and master the behavior of this PV system. Moreover, it seeks building up a better and more reliable PV model to replicate the exact I-V characteristics. To validate the accuracy of the proposed model, a comparison with MATLAB PV model was carried out. Simulation results of this model were obtained using 20-Sim software. The outcome reveals that the model replicates MATLAB PV model curve to a very good degree of accuracy under the considered operating conditions. Keywords: Bond Graph, Modeling, Matlab Simulink, Photovoltaic System. --------------------------------------------------------------------------------------------------------------------------------------- Date of Submission: 11-11-2017 Date of acceptance: 30-11-2017 --------------------------------------------------------------------------------------------------------------------------------------- I. Introduction Solar energy remains the most promising renewable energy source when it comes to power generation [1,2]. Due to the relative high initial cost of a solar photovoltaic (PV) system - which convert solar energy into electrical energy - an accurate assessment of the electrical characteristics is vital to optimizing the electrical behavior of the PV source itself and the operation of power conversion systems. Photovoltaic generator is a source of finite energy with a non-linear current-voltage characteristic that directly converts the solar radiation into electricity with no noise and no pollution. There are several mathematical models that successfully describe the performance and nonlinear behavior of PV systems. The most common and widely adopted ones are the single diode model and double diode model [3]. The modelling of photovoltaic system elements is an indispensable and important step that must precede any application of sizing, identification or simulation. Different models developed for PV applications were presented in several papers [4,5,6,7,8,9]. The photovoltaic system modelling is complex. That’s why we propose the use of Bond Graph (BG) method which enables the decomposition of the system into subsystems exchanging energy, and to represent several physic domains with a unified way. Bond Graph modeling is one of the powerful tools used for the systemic modeling since it considers the same generic elements for every physical domain [10,11,12,13]. Each dynamic system can be modeled using the store energy elements (C or I elements) addition to dissipate energy elements (R element) with convert energy elements (transformers and gyrators elements). In addition to the elements that are used to represent external inputs such as source elements (either effort source or flow source) and common effort or common flow relations (that are 0 and 1 junction, respectively). The dependency between these different elements is recognized by the causal analysis. These causality elements put many advantages to this technique. They make easy the modeling of multi-domain systems such as electrical, electromechanical, mechanical systems [13]. Bond Graph technique is an energetic representation based on the flow and the effort elements and it offers a behavior analysis and syntheses using the causality propriety [12]. Our study is focused on the application of the Bond Graph Methodfor modeling Photovoltaic system, Its goal is to study and master the behavior of the PV system. An introduction to Bond Graph Approach is reported in Section 2. A detailed bond graph model of photovoltaic generator is proposed in Section 3. The comparative results of this study are given in Section 4. Finally, concluding remarks are presented in Section 5.