MPPT algorithm in single loop current-mode control applied to dc-dc converters with input current source characteristics

This paper proposes a novel current-mode Maximum Power Point Tracking (MPPT) approach applied tophotovoltaic 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 saturationduring sudden drops in solar irradiance are addressed, as well as the solution based on an adaptive stageto overcome this limitation. Besides, the feasibility of the proposed MPPT is tested experimentally in threedifferent dc converter topologies with single-loop current control, applied to off-grid photovoltaic batterycharging systems. To determine the optimal MPPT operating design, the control sampling frequency andperturbation-update MPPT frequency are tested using the MPPT static efficiency as a figure of merit, obtaininga good compromise in 2 kHz and 4 Hz, respectively. The experimental setup tested for the three dc convertersreached the efficiency values of 97.87% for Boost, 95.85% for SEPIC and 95.89% for Cuk

Automated summary

This paper proposes a novel current-mode Maximum Power Point Tracking (MPPT) approach for photovoltaic systems. The proposed method improves robustness and performance through fixed and variable current-perturbation steps, and addresses issues related to current saturation during drops in solar irradiance. Experimental results demonstrate the feasibility and high efficiency of the proposed method in different dc converter topologies.