A Robust Multiloop Disturbance Rejection Controller for a Doubly Fed Induction Generator-Based Wind Energy Conversion System

The doubly fed induction generator (DFIG) is a nonlinear system with various uncertainties, including parameter changes, wind speed variations, and rapid dynamic fluctuations, making model-based control techniques challenging to implement. Hence, the multi-loop active disturbance rejection controller (MADRC) is proposed as an enhanced active disturbance rejection control to stabilize and reject external disturbances and system uncertainties. In this article, two active disturbance rejection controllers (ADRCs) are connected in series to achieve the rotor side converter (RSC) controller. The performance of the proposed control strategy is first evaluated using simulation on a 3.7-kW DFIG setup, and subsequently on a 1-kW DFIG-based wind energy conversion system (WECS) developed in our laboratory. The proposed controller is compared to a proportional-integral (PI) controller, single-loop active disturbance rejection controller (SADRC), and sliding mode controller (SMC) in order to demonstrate its effectiveness. The obtained outcomes are evaluated for reference tracking, robustness to parameter fluctuation, and disturbance rejection in DFIG. External disturbances and system uncertainties are effectively mitigated by the proposed MADRC scheme.