Servomechanism based Optimal Control System Design for Maximum Power Extraction from WECS with PMSG

The integral servomechanism based linear output feedback control for wind energy conversion systems (WECSs) with permanent magnets synchronous generator (PMSG) has been designed for maximum power extraction. The extended state space equation for given system's error dynamics has been formed. The linear quadratic regulator's optimal control laws are designed and calculated offline. The maximum power extraction from wind energy is achieved via accurate tracking variable reference of the generator's angular shaft speed. The wind is acted as an external disturbance and its speed is estimated with high order disturbance observer (HODO) enhancing reliability of the whole system in case of fault of the anemometer. The simulation results are shown effectiveness of the proposed control system under nominal parameters and some parameters uncertainties, noise, and modelling errors than with traditional disturbance compensation scheme.