Variable pitch optimization control is a critical method for reducing the impact of sea ice loads on wind turbines. However

frequent adjustments can lead to actuator faults. To minimize the impact of these faults on the turbine's output power

this paper proposes a fault-tolerant control strategy based on switched adaptive sliding mode. Considering the coupling relationship between ice loads

actuator faults

and mechanical characteristics of turbines

a switched linear model is built. Parameters for each operating condition are identified by using test data. Based on the switched linear model

switching sliding mode surfaces

a full-order observer

an adaptive law

and a restrict switch law are designed. A piecewise Lyapunov function is designed by stability theory to prove the convergence of the control system. Relevant gain parameters are solved using the linear matrix inequality method. To prove the effectiveness of the controller

this paper conducts comparative experiments with the optimal gain scheduling control strategy under both healthy and faulty actuator scenarios. The results show that the designed control strategy can quickly respond to system output errors caused by ice loads or faults

rapidly apply compensation commands to the actuators

effectively suppress disturbances of the system

and achieve improved fault-tolerance performance.