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.
