Abstract:
This article proposes a new approach to design a fault-tolerant control (FTC) scheme for
tracking the optimal power of wind energy conversion systems (WECSs). In this article, the considered fault
will not only impact on actuator but also sensors. As the fault severely affects the performance of WECSs,
the FTC are required to be worked accurately and effectively. The polynomial observer, as a part of the
proposed FTC system, is synthesized to estimate the aerodynamic torque, electromagnetic torque, and fault
simultaneously without using sensors to measure. The information of these parameters is sent back to the
LQR (Linear Quadratic Regular) controller of WECSs. Both fault and aerodynamic torque in this study are
unnecessary to fulfil any constraint. It should be noted that WECSs is reconstructed to a new form based
on the descriptor technique, then the observer will design for this new form instead of the original system.
Based on Lyapunov methodology and with the aid of SOS (Sum-Of-Square) technique, the conditions for
polynomial observer design are derived in the main theorems. Finally, the simulation results have proved the
effectiveness and merit of the proposed FTC method.