Variable universe adaptive fuzzy PI control used in VSCF wind power generator system

Wind power generation system is a complicated multivariable system with strong nonlinear, uncertainty and coupling. It´s difficult to build precise mathematical model by using conventional method. In order to capture maximum energy, variable universe adaptive fuzzy PI control based on stator flux oriented vector control is proposed, which is used to control the generator stator active and reactive power. Firstly, according to the power characteristics of wind turbine and generator power flow equations, the optimal stator active power reference value is obtained. Secondly, the model of doubly-fed induction generator (DFIG) is established. Then the variable universe fuzzy adaptive controller is designed. Finally, the proposed method is simulated with MATLAB/simulink at the time of wind speed lower than the rate, the results have confirmed the feasibility and performance of the control strategy.