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In this paper, we propose a new control strategy called linear active disturbance rejection control (ADRC) used to control the wind energy conversion system (WECS) based on doubly-fed induction generator (DFIG). This recent control strategy is compared with the conventional RST polynomial control method considered better and more efficient than the classical PI method according to different works. By the extended state observer ESO of the ADRC controller, the internal and the external disturbances on the system are estimated and compensated as a total disturbance in real time. Moreover, the proposed ADRC method is easy to tune and more practical which has only one tuning parameter. The RST controller has three polynomials chosen in order to reduce the effect of disturbance. These controllers have been used to control the stator powers of DFIG in order to extracting the maximum energy produced by the wind by using a maximum power point tracking (MPPT), to regulate the dc-link voltage in order to maintain DC bus voltage at constant value and to regulate the reactive power to ensure a unitary power factor. Then, these both control strategies are designed and their performances are compared in order to deduce the most efficient in terms of reference tracking and robustness. The simulation results prove that the proposed ADRC control technique is more robust and have better performance than the RST control.

international journal of intelligent engineering and systems

Comparative Study of Active Disturbance Rejection Control with RST Control for Variable Wind Speed Turbine Based on Doubly Fed Induction Generator Connected to the Grid