The output power of photovoltaic electrical systems is highly dynamic and non-linear in nature. In order to extract maximum power from such systems, maximum power point tracking (MPPT) technique is required. MPPT techniques with variable step-size of perturbation track the maximum power point (MPP) with more efficiency. In this paper, a model of a fuzzy logic controller (FLC) for determining the step-size of perturbation in duty-cycle of a photovoltaic electrical system to track MPP is presented and its result is compared with a classical method of exponential approximation in MATLAB/Simulink®.Keywords-Maximum power point tracking, boost converter, perturb and observe, exponential approximation, fuzzy logic control, membership function.

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