Research on the Low Voltage Ride-through Control Strategy based on State Feedback Linearization

Abstract

Based on the analysis of on the dynamic mathematical model of double-fed wind turbines, exact non-linear state feedback linearization control method is adopted to design the control strategy of the LVRT (low voltage ride-through). Firstly, we select the output functions according to control target, and formulate the nonlinear system including input and output. Then, by using linearization the state feedback and using proper coordinate transforming, we convert this nonlinear system to the linear and controllable system. Finally, we finish the control strategy of the control system through the optimized linear control strategy. This control strategy only depend on the parameters of the wind turbines, and strengthen the robust of the parameters of control strategies.