A fast and robust maximum power point tracking scheme with ability to track maximum power point (MPP) under partially shaded condition (PSC) is proposed for photovoltaic (PV) systems. The fast dynamics and robustness are attained by a sliding mode control and ability to track maximum power point under PSC by a MPPT algorithm with variable steps. In response to irradiance variations, the proposed algorithm recognizes shading and activates the scanning phase of the algorithm to find the global maximum power point (GMPP). In order to verify the accuracy and validity of the proposed method, different simulations are carried out in MATLAB-Simulink environment for various atmospheric conditions.

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