In this paper, a fractional-order sliding mode based extremum seeking controller (FO SM-ESC) is proposed as a maximum power point tracking (MPPT) algorithm for a PV system. The FO SM-ESC combines extremum seeking controller with FO sliding mode dynamics, in which FO proportional-integral (PI) sliding surface is adopted. The FO SM-ESC can not only guarantee the output power stay around the maximum power point but also have a faster tracking performance and higher accuracy than integer-order (IO) SM-ESC with proportional (P) or PI sliding surface. Simulation and experimental results demonstrate the effectiveness of the proposed method.

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