Fractional Order and classical PI Controllers Application to Wind Energy Conversion Systems

Abstract

Wind power plants are known to have nonlinear dynamics and carry many uncertainties as parameter uncertainties and unknown nonlinear disturbances. So, it is a challenging task to design a robust controller for this system. This paper proposes a robust fractional-order proportional integral (FOPI) controller for maximum power point tracking (MPPT) control of permanent magnet synchronous generator (PMSG)-based wind energy conversion system. A comparison with the classical integer order proportional integral (IOPI) controller has been handled under the same number of parameters design and tuning constraints. This may guarantee the robustness to the loop gain variations of the designed controllers and the desired control performance. Comparison of the two controllers (i.e., IOPI, FOPI) via the simulation tests show that, the IOPI controller designed cannot always be stabilizer to reach flat-phase constraint while FOPI controller designed is always stabilizing.