A modified current sensorless approach for maximum power point tracking of partially shaded photovoltaic systems

Nabil Obeidi, Mostefa Kermadi, Bachir Belmadani, Abdelkrim Allag, Lazhar Achour, Nadhir Mesbahi and Saad Mekhilef

Energy, 2023, vol. 263, issue PA

Abstract: The present paper proposes a modified current sensorless approach to reduce the implementation cost of maximum power point tracking (MPPT) controller for photovoltaic (PV) systems under partial shading conditions (PSCs). The proposed scheme relies only on the input voltage signal without the need for a current sensor to track the global maximum power point (GMPP). This is performed using a predefined objective function derived from the mathematical model of the buck-boost converter with an adaptive step-size mechanism for quick convergence. In addition, a formula of lower and upper limit duty cycle values for every local peak is incorporated for fast detection of local power peaks. An extensive experimental study, using a hardware prototype composed of a buck-boost converter driven by a dSPACE DS1104, is carried out to validate the proposed control scheme. Experimental results show that the proposed controller is able to accurately track the GMPP with high speed under various PSCs scenarios. Additionally, the proposed scheme reduces the implementation cost by 27.95% compared to conventional MPPT techniques.

Keywords: Global maximum power point (GMPP); Objective function; Modified current sensorless (MCSL); Partially shaded conditions (PSCs); Photovoltaic (PV) system (search for similar items in EconPapers)
Date: 2023
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Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:263:y:2023:i:pa:s036054422202504x

DOI: 10.1016/j.energy.2022.125618

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