Adaptive feedback fault-tolerant control of wind turbine generator main drive system based on fault reconstruction

Abstract

Considering the occurrence of actuator faults in the wind turbine generator main drive system, a fault model of the wind turbine generator main drive system is established. First, an adaptive sliding mode observer is designed to estimate the actuator faults, which is able to identify and reconstruct the faults quickly and provides the necessary information for the implementation of fault-tolerant control. In order to improve the design process of the observer, the gain matrix solution problem is transformed into an optimization problem subject to linear matrix inequality constraints. Secondly, considering the existence of unmodeled dynamics and external noise disturbances in the main drive system, an adaptive feedback fault-tolerant controller is designed using the fault reconstruction information after an actuator failure occurs in the system to compensate for the system errors caused by actuator failures, unmodeled dynamics, and external noise disturbances, which ensures a stable operation of the system. Finally, a simulation study of a 5 MW wind turbine system shows that at an average wind speed of 7.5 m/s and a turbulence intensity of class A, the system is restored to a normal state after the addition of the fault-tolerant controller, and the generator electromagnetic torque error is only 1.89%, which verifies the validity of the proposed method.