Robust Control for Photovoltaic System Under Partial Shading Effect Using the SEPIC Converter

Mohcine Mokhlis, Mohammed Ferfra, Ahmed Abbou, Rafika El idrissi

Abstract


Under the partial shading effect, the photovoltaic modules are subjected to the non-uniform insolation. In this case, the Power-Voltage curve contains several maximum power points (global and local maximums). In fact, the MPPT algorithms such as P&O and IC, cannot distinguish the global maximum. Thus, a considerable drop in power is produced. To tackle this problem, this article proposes a SLG-Backstepping technic. This latter, Sweeps the Power-Voltage curve, Looks for the global maximum power point, and Generates the reference of optimal voltage. Then, the Backstepping control was designed to pursue the reference voltage by adjusting the duty cycle of the SEPIC converter. This algorithm  was  simulated  on MATLAB/SIMULINK  environment, evaluated  under uniform and non-uniform insolation and compared to the PSO with Backstepping control. In  this  latter,  the  PSO  (Particle  Swarm Optimization)  serves  to generate  the  voltage reference that corresponds to the Global Maximum Power Point, while the backstepping controller tracks this voltage reference. According to the results, the SLG-Backstepping algorithm is accurate and has a fast convergence time is about 40ms until 50ms depends on the shading pattern.

Keywords


Backstepping control; Partial Shading Effect; Particle Swarm Optimization; Photovoltaic Panel; SEPIC Converter.

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References


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DOI (PDF): https://doi.org/10.20508/ijrer.v9i2.9111.g7638

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