Abstract
This paper proposes a novel current-mode Maximum Power Point Tracking (MPPT) approach applied to photovoltaic systems. The proposed MPPT is implemented in three stages with fixed and variable current-perturbation steps to improve its robustness and performance. Issues related to the MPPT current saturation during sudden drops in solar irradiance are addressed, as well as the solution based on an adaptive stage to overcome this limitation. Besides, the feasibility of the proposed MPPT is tested experimentally in three different dc converter topologies with single-loop current control, applied to off-grid photovoltaic battery charging systems. To determine the optimal MPPT operating design, the control sampling frequency and perturbation-update MPPT frequency are tested using the MPPT static efficiency as a figure of merit, obtaining a good compromise in 2 kHz and 4 Hz, respectively. The experimental setup tested for the three dc converters reached the efficiency values of 97.87% for Boost, 95.85% for SEPIC and 95.89% for Ćuk.
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