Contribution a l’étude d’une installation photovoltaïque avec stockage connectée au réseau électrique .

Abstract

The objective of this doctoral thesis is to optimize and improve the performance of the photovoltaic solar energy conversion chain connected to the grid in terms of energy quality injected to the electrical grid, price, and efficiency conversion. For this, we began our study by generalities on solar photovoltaic energy, photoelectric conversion; cell, panel, and photovoltaic field have been defined with theirs construction technologies, as well as the associated protections. Subsequently, we proceeded to the implementation of the maximum power point tracking MPPT procedure to maximize the photovoltaic energy produced, indeed, two control techniques are adopted: Perturb & observe and incremental conductance. The performances of these last two methods are tested in several rigorous meteorological conditions, to prove their efficiencies and robustness. Then, we have focused our studies to an application more representative to the final goal of the thesis, by introducing a power electronic interface (two-level voltage inverter) with the electrical grid and storage system to remedy the energy solar fluctuations. The results obtained clearly illustrate a very high performance in terms of stability and robustness against all strict scenarios imposed. Also, in order to optimize the conversion chain, a new DC-AC converter has been proposed: z source inverter. The advantage of this converter is increasing or decreasing the input voltage and ensure the energy conversion into a single stage (DC-AC). In addition, we have introduced another converter called quasi z source inverter similar to the z source inverter, in fact, it retains all advantages of the latter and offers other structural and technical performances because it can deliver a constant and continuous current at the converter input, and decreasing the values of the passive elements used, as well, its structure offers more possibility to integrating several storage technology. All these advantages make this converter very suitable for the power conditioning in a standalone photovoltaic system and grid connected installation. During the various simulation scenarios that we have imposed, all results obtained demonstrate the effectiveness of the converter and confirm the robustness, stability of all implemented algorithms.