A Robust Nonlinear Control Strategy of a PV System Connected to the Three-Phase Grid Based on Backstepping and PSO Technique

SALMA ZOUGA, Mohamed Benchagra, Abdallah Ailane

Abstract


This article presents an advanced nonlinear control technique of a photovoltaic system connected to three-phase Grid. The structure chosen for this PV system is that of DC voltage intermediate bus, with two power converters: the DC-DC converter and the three-phase inverter, which requires two main controllers. The objectives of these controllers are threefold. The first objective is to impose the voltage at the output of the photovoltaic panel, in order to follow a maximum reference provided by the MPPT block. The second objective is to regulate the DC link voltage to a constant reference value, in order to ensure the transfer of energy between the two power converters. The third objective is to inject into the grid, a three-phase sinusoidal current, ensuring a unit power factor. In order to achieve these three objectives, cascading nonlinear controllers are designed. The synthesis of these two controllers, was performed using the technique of non-linear backstepping control, based on the Lyapunov function, in order to regulate the PVG output voltage, and to ensure a unit power factor at the grid side. For the regulation of the DC-link voltage, an integral proportional controller (PI) is developed with parameters which are optimized by the Particle Swarm Optimization (PSO) method. The robustness of the proposed control approach is tested by a simulation in Matlab / Simulink, which clearly demonstrates the performance provided by each controller with respect to climate change.

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DOI: http://doi.org/10.11591/ijpeds.v12.i1.pp%25p
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