Application of Linear Quadratic Regulator to Control Directly Power for DFIG Wind Turbine

This paper designs a new control law to control directly the power output of a doubly fed induction generator wind turbine. The proposed control law is based on Linear Quadratic Regulation for both grid side and rotor side converter; the rotor side converter's controller is to get the maximum power output of the wind turbine and reference reactive power in the stator winding side while the grid side converter s controller aims to remain a constant voltage on the DC link and a constant reactive power output in the grid side converter. The proposed method is evaluated by simulating a 1.5-MW doubly fed induction generator wind turbine in MATLAB/Simulink environment. From simulation results, we can be seen that by using the suggested controllers, the errors between the reference values and actual values are smaller than that of a proportional-integral controller. Therefore, the doubly fed induction generator wind turbine with proposed controllers has a good performance.