Abstract
A fixed size perturbation in a Maximum Power Point Tracking (MPPT) algorithm yields excessive oscillations of operating point around the MPP and thus causes fluctuations in the dc link voltage and flickers in the injected grid current. In this paper, we propose a new adaptive P&O MPPT by employing a Proportion-Integral (PI) controller to generate variable perturbations which eliminates the steady state error and yields faster settling time in the MPP tracking response. A comparative analysis is made using simulations in MATLAB/ Simulink first then experimental studies on a prototype of grid connected PV system (GCPVS) is pursued. The obtained results are analyzed and it is found that the adaptive MPPT effectively reduces the dc-link voltage oscillations and injected grid current flickering.
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