Non‐linear extended state observer‐based sliding mode control for a direct‐driven wind energy conversion system with permanent magnet synchronous generator

Abstract

Considering the internal and external disturbances of direct-driven wind turbine-based permanent magnet synchronous generation system, an extended state observer (ESO)-based sliding mode variable structure control strategy is proposed to improve the maximum power tracking performance of the system. The ESO is used to estimate the effects of the disturbances, such as dynamical uncertainties, modelling error, external forces, variety of wind speed and so on, and eliminate the disturbances by the feedforward compensation. The simulation results show that the control system not only effectively improves the anti-disturbance ability of the system, but also solves the chattering problem of sliding mode control system to a certain extent.