Robust hybrid sensorless control of variable speed wind turbine with permanent magnet synchronous generator

In this study, in order to improve dynamic performance of variable speed permanent magnet synchronous generator (pmsg) drive system and obtain a speed (mechanic) sensorless operation, a second order sliding mode controller together with a hybrid observer are proposed. in the presence of instantaneous speed change and disturbance effects such as parameter and load torque deviations, it is aimed at developing a robust speed response against all uncertainties without using a mechanical sensor in the drive system. in controlling pmsg, a second order sliding mode observer and a simple kalman filter, hybrid structure, are utilized in view of their simple observer-controller structure. thanks to this the structure, chattering effect, one of the important disadvantages of classical sliding mode observer-controller structure, is reduced and a good dynamic speed response is yielded in variable speed operation. results are compared to classical sliding mode and differences between the hybrid observer-controller and the classical system are