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Design and experimental validation of an efficient control based on variable step size P&O MPPT technique and predictive current controller for a single-phase grid-connected photovoltaic system

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Abstract

This paper describes an efficient control, which improves the power quality, and the dynamic response of a photovoltaic (PV) system connected to a single-phase grid. The used conversion structure is composed of two stages linked by a DC-bus capacitor. The first is a DC–DC boost converter connected to the PV array output, used to extract its available maximum power (MP). Its control system includes a variable step size perturb-and-observe (P&O) maximum power point tracking (MPPT) technique, which offers high-tracking speed of maximum power point (MPP) with reduced oscillations around the MPP in the steady state. The second is a Pulse-Width Modulated Voltage Source Inverter (PWM-VSI) connected to the single-phase grid through a coupling inductor. The PWM-VSI is used to ensure the injection of the produced PV power into the grid. It is controlled by a closed-loop control that contains a simple proportional-integral (PI) controller which ensures a good DC-bus voltage regulation, and a predictive current controller (PCC) which forces the instantaneous grid current to track its reference with fast dynamic response. The structure is simulated by a digital simulation under MATLAB/Simulink environment, and experimentally tested at real atmospheric conditions with a real-time implementation using dSPACE 1104 system card. The obtained results show that the MP of the PV array is extracted with a fast-tracking speed and reduced oscillations, the DC-bus voltage is well regulated and the harmonic distortion level is significantly low with a good system dynamic response.

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Authors and Affiliations

  1. QUERE Laboratory, Electrical Engineering Department, Faculty of Technology, Ferhat Abbas University, Setif 1, 19000, Setif, Algeria

    Nadir Hata & Samir Sayah

  2. LAS Laboratory, Electrical Engineering Department, Faculty of Technology, Ferhat Abbas University, Setif 1, 19000, Setif, Algeria

    Nouri Belhaouchet

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  1. Nadir Hata
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  2. Nouri Belhaouchet
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Contributions

Mr. HATA, Nadir realized the simulations, the experimental work and the editing of the manuscript. Dr. BELHAOUCHET Nouri realized the simulations, the experimental work and the editing of the manuscript. Pr. SAYAH Samir reviewed the manuscript.

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Correspondence to Nadir Hata.

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Hata, N., Belhaouchet, N. & Sayah, S. Design and experimental validation of an efficient control based on variable step size P&O MPPT technique and predictive current controller for a single-phase grid-connected photovoltaic system. Electr Eng 105, 2637–2652 (2023). https://doi.org/10.1007/s00202-023-01831-5

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  • DOI: https://doi.org/10.1007/s00202-023-01831-5

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