Integral variable structure fuzzy adaptive control for variable speed wind power system

In order to maximize capture wind power, wind turbine generator needs to tune wind turbine speed according wind. It is difficult to obtain the better dynamic quality and robustness by conventional controller based on mathematic model due to uncertainty of wind speed and wind direction. An integral variable structure fuzzy adaptive controller is proposed for variable speed wind power system with uncertain model parameters and force disturbances. The control scheme is based on variable structure controller with integral compensation. The uncertainties are approximated based on fuzzy theory. Furthermore, fuzzy adaptive method is applied to regulate the gain of switch control variable in order to eliminate the chattering phenomenon that is inherent to variable structure system. The stability of the proposed controller is proved using Lyapunov method. Simulation results indicate that the strong robustness and better tracking performance can be achieved.