An enhanced MPPT fuzzy control of a wind turbine equipped with permanent magnet synchronous generator

In this paper a robust intelligent controller is adopted in order to fulfil maximum power point tracking (MPPT) algorithm for permanent magnet synchronous generator (PMSG) with the application of wind turbines. Conventional linear PI controller is simple and easy to implement but it has the drawback of dependence on system parameters especially in a wind energy conversion system with large amount of uncertainties as a sequence of wind speed variation. Due to inherent robustness to uncertainties in fuzzy logic controller, it can be used effectively in wind energy conversion system. However designing procedure and gain tuning could be a challenging approach. In this paper the initial parameters of FLC are obtained from the parameters of its well-tuned linear counterpart. This is a flexible control scheme that takes advantage of the best features of fuzzy control, robustness to uncertainties, and of PI controller, simple tuning procedure. This intelligent controller is designed in presence of mechanical parameters as well as mechanical torque disturbance, which is the most concerned uncertainty in wind turbines. Simulation results clearly shows performance of proposed robust fuzzy PI control system in maximum power points tracking in a wind energy conversion system.