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[en] Partial shading conditions are among the most important problems in large photovoltaic array. Many works of literature are interested in modeling, control and optimization of photovoltaic conversion of solar energy under partial shading conditions, The aim of this study is to build a software simulator similar to hard simulator and to produce a shading pattern of the proposed photovoltaic array in order to use the delivered information to obtain an optimal configuration of the PV array and construct MPPT algorithm. Graphical user interfaces (Matlab GUI) are built using a developed script, this tool is easy to use, simple, and has a rapid of responsiveness, the simulator supports large array simulations that can be interfaced with MPPT and power electronic converters.
[en] In this study, a computer-aided simulation of the homo-junction thin films of solar cell was presented. Different solar cell structures PN and PIN based on 3C-SiC have been studied and the effects of the illumination intensity on the electrical properties of these solar cells such as: the short- circuit current density (Jsc), the open circuit voltage (Voc), the factor (FF) and photovoltaic conversion efficiency (η) were investigated. The numerical simulations were performed at different conditions of illumination : 90mW.cm− 2, 100mW.cm− 2and 135mW.cm− 2, under absolute temperature T = 300 K. The results have demonstrated that the maximum electrical conversion efficiency of about 23.24 % and 23.41% for PN and PIN junction, respectively, which makes the two proposal structures suitable as photovoltaic (PV) solar cell applications.
[en] Highlights: • The performances of a DFIM are considered when it is fed by a matrix and a multi level inverter. • We have presented the stategies of contorl of the two considered configurations. • The obtained simulation results are analyzed and discuted. • Time and frequency analyzes show a better performances when the DFIM is fed by a matrix converter. - Abstract: In this paper, we study the performance of a doubly fed induction machine when its stator and rotor are respectively fed by a matrix converter and a multi level inverter. For this, we first present the structures and models of the machine, the multi level inverter and matrix converter. Then, using simulation analysis, we proceed to test the rate of harmonic distortion of the stator currents obtained for the two considered configurations. The obtained simulation results by numerical simulations are shown and analyzed
[en] In this paper, a new combined fuzzy observer-based fault-tolerant tracking control scheme is proposed for a doubly fed induction generator (DFIG) based wind turbine (WT) subject to actuator faults. The main contribution consists of the proposal of a novel fault-tolerant fuzzy tracking controller combined with a nominal control law. The control objective is to ensure good state references tracking regardless of the actuator faults effects and simultaneous system state and faults estimation. This later requires the knowledge of the occurrence of actuator faults which are estimated from a Takagi-Sugeno Fuzzy Proportional Integral Observer (T-S FPIO). Within this control scheme, a T-S FPIO has been developed to provide stability tracking error dynamics even the system is subjected to different actuator faults. A compensation term is appended to the composite controller and to ensure robustness against actuator faults. Stability and tracking analysis properties are demonstrated through a quadratic Lyapunov function, which are formulated in terms of Linear Matrix Inequalities (LMIs). The observer gains are determined based on the proposed LMIs stability conditions. A numerical simulation is carried out on a typical 1.5 MW DFIG based WT system to access the effectiveness of the proposed control scheme in comparison to the existing results.