A Nonlinear Backstepping Controller for Grid Connected Photovoltaic System

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

Abstract


This paper presents a nonlinear backstepping control design for a grid connected Photovoltaic (PV) system. This controller is used for a DC-DC boost converter to control the output voltage of the PV array according to a reference voltage produced by the Incremental Conductance (IC) algorithm. It is also applied to control the three phase inverter grid side to manage the DC bus voltage, active and reactive powers. The proposed controller is based on Lyapunov function to ensure the stability and to increase the effectiveness of the PV system. Simulation results are obtained in a Matlab/Simulink environment. The results indicate an excellent rapid response and fewer fluctuations even under the varying environmental conditions. It offers also an optimal PV power and a significant quality of current injected into the grid. Furthermore, it confirms the robustness in terms of injecting maximum active power into the grid, while keeping the DC bus voltage and the reactive power fixed at certain values. The validity of the Backstepping Controller (BSC) is proved with regard to extracting the Maximum Power Point (MPP) which is compared to the classic IC algorithm. Moreover, it is also demonstrated in the matter of controlling the Pulse Width Modulation (PWM) of the three phase inverter in comparison to the classic Proportional Integral (PI) controller.

Keywords


Backstepping control; Grid connected PV system; Incremental conductance algorithm; Lyapunov function; MPPT; PI controller.

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References


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DOI (PDF): https://doi.org/10.20508/ijrer.v16i2.15282.g9211

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