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Journal of Solar Energy
Volume 2018 (2018), Article ID 6791056, 14 pages
Research Article

Output-Feedback Nonlinear Adaptive Control Strategy of the Single-Phase Grid-Connected Photovoltaic System

1LTI Lab, Faculty of Sciences Ben M’sik, University Hasan II of Casablanca, 7955 Casablanca, Morocco
2LRI Lab, ENSEM of Casablanca, University Hasan II of Casablanca, 7955 Casablanca, Morocco

Correspondence should be addressed to Chaouqi Aouadi

Received 13 September 2017; Revised 10 November 2017; Accepted 21 January 2018; Published 8 March 2018

Academic Editor: Sundaram Senthilarasu

Copyright © 2018 Abdelmajid Abouloifa et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


This paper addresses the problem of controlling the single-phase grid connected to the photovoltaic system through a full bridge inverter with LCL-filter. The control aims are threefold: (i) imposing the voltage in the output of PV panel to track a reference provided by the MPPT block; (ii) regulating the DC-link voltage to guarantee the power exchange between the source and AC grid; (iii) ensuring a satisfactory power factor correction (PFC). The problem is dealt with using a cascade nonlinear adaptive controller that is developed making use of sliding-mode technique and observers in order to estimate the state variables and grid parameters, by measuring only the grid current, PV voltage, and the DC bus voltage. The control problem addressed by this work involves several difficulties, including the uncertainty of some parameters of the system and the numerous state variables are inaccessible to measurements. The results are confirmed by simulation under MATLAB∖Simulink∖SimPowerSystems, which show that the proposed regulator is robust with respect to climate changes.