Robust Second-Order Sliding-Mode Control for a Grid-Connected PV System

Noureddine Ech-cherki, Oumaima Echab, Youssef Errami, Abdellatif Obbadi, Smail Sahnoun, Mohssin Aoutoul

Abstract


Les systèmes photovoltaïques (PVS) connectés au réseau électrique se caractérisent par une forte non-linéarité et une multivariabilité, impliquant de nombreux facteurs d'incertitude, de perturbation et de changement climatique. C'est pourquoi cet article propose l'utilisation d'une stratégie de contrôle en mode glissant de second ordre (SOSMC) pour contrôler un PVS via deux étages de conversion. Le convertisseur côté générateur photovoltaïque (PVG) est utilisé pour suivre le point de puissance maximale (MPPT) afin de générer un maximum d'énergie à partir du PVG. D'autre part, le convertisseur connecté au réseau injecte la puissance générée par PVG dans le réseau et régule la tension du bus CC (V dc ) et est utilisé pour atteindre le facteur de puissance unitaire (UPF). Les deux convertisseurs utilisent des contrôleurs SOSMC. La technique de régulation mise en œuvre permet un ajustement indépendant de la puissance active et réactive à travers des composantes de courant en quadrature et en direct, respectivement. Cette étude examine une approche de contrôle SOSMC pour optimiser l'efficacité énergétique d'un PVS et améliorer sa robustesse face aux conditions climatiques changeantes. Les performances du système ont été validées dans des conditions d'irradiation standards et variables. Pour mettre en œuvre et évaluer le contrôle proposé sur le contrôle vectoriel conventionnel (CVC) dans différentes conditions, cette étude a utilisé l'environnement Matlab/Simulink. Les résultats de la simulation ont montré que le SOSMC contribue à améliorer les performances et l'efficacité du système dans différentes situations. Le contrôle proposé a réduit le dépassement de puissance active (P) de 100 % et le temps de réponse Vdc de 50 % par rapport au CVC. De plus, il a réduit la distorsion harmonique totale (THD) du courant à 1,09 %, contre 2,19 % pour le CVC.

Keywords


Current Vector Control, DC–DC Boost Converter, Electrical Grid, MPPT, Photovoltaic System, Second Order Sliding Mode Control

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References


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DOI (PDF): https://doi.org/10.20508/ijrer.v16i3.15496.g9243

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