DESIGN OF AN EFFECTIVE CONTROL FOR GRID-CONNECTED PV SYSTEM BASED ON FS-MPC

This paper is deals in part of research that has been conducted on modern means in the basis of power electronics. Harmonic cancellation of distribution network is currently a serious problem, especially in high electrical industry. The main source of harmonic currents injected into the network requires attention to reduce the current harmonic levels. Energy quality is a fairly broad concept which covers both, the quality of power supply (voltage wave) and these of the currents injected into the electrical grid. In this context, a modern approved preventive solution in purpose to limit the rate of harmonic disturbance caused by the deferent power electronics systems connected to the grid must take action. It appears necessary to develop the quality and stability of the grid and develop curative devices such as converters provided with a control device making the current drawn on the most sinusoidal network possible. This paper proposes a control of tow stage grid tied PV system established on finite set model predictive control (FS-MPC). The design of FS-MPC is developed depending on the structure and operating principle associated to three-phase inverter tied to the grid.  In this context, we have also employed the structure of MPPT controller (P&O) and PI controller for adjustment of the DC-bus voltage. To set the proposed control scheme, numerical simulations are carried out using Matlab/Simulink 2013b. The obtained results demonstrate that the proposed control scheme assure the tracking of MPP and the injection of extracted PV power into the grid with high current quality under irradiation changes

Bond graph modeling and optimization of photovoltaic pumping system: Simulation and experimental results

International audienc

Modeling, simulation and hardware implementation of a bond graph-maximum power point tracker for a photovoltaic panel under partially shaded conditions

The electric power generated by a photovoltaic module can be greatly reduced compared with optimal production due to weather conditions and factors such as partial shade. The main defect of a conventional maximum power point tracking control algorithm is its misinterpretation of the location of the maximum power point during a sudden change in climatic conditions because of the existence of several local maxima on the power–voltage characteristic curve. This work presents a preliminary study on the modeling, simulation and implementation of a new algorithm for power output maximization of photovoltaic generators under partially shaded conditions using a bond graph approach. The idea is to use a buck-boost converter and to test experimentally the performance of the proposed algorithm on a real photovoltaic panel. We imposed ten patterns of irradiance on the photovoltaic panel, of which more than half were patterns of partial shading. The proposed controller performed excellently under all shading conditions compared with the classical direct duty cycle technique. The control part and the proposed algorithm were implemented on a microcontroller, and the efficiency of the developed algorithm was demonstrated as a function of the real position of the maximum power point through the results of a simulation performed using Symbols (SYstem Modeling by BOnd graph Language and Simulation) software. The results obtained from the simulation were compared with experimental results obtained from real measurements using a Photowatt PW1650 photovoltaic panel under the same operating conditions and climatic environment. </jats:p

Bond graph modeling and optimization of photovoltaic pumping system: Simulation and experimental results

International audienc