Due to the characteristics of nonlinear

time varying and hysteresis of hydraulic variable pitch system

a fuzzy PI control way is proposed based on the traditional PI control in hydraulic variable pitch control system. According to the pitch control system with hydraulic variable random disturbance signal

resulting in low control precision of hydraulic variable pitch system

a method of unscented Kalman filter based on Simulink is presented.The 2 MW wind turbine hydraulic variable pitch system is simulated

the simulation results show that the fuzzy PI algorithm and Kalman filter combined control correction signal can track the actual trend of signal and improve the hydraulic pitch control system precision and response time

and further optimize the performance of hydraulic pitch control system.