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This paper presents a novel decoupling control strategy, corresponding to the vector control of induction motors, for the Brushless Doubly-Fed Machine (BDFM). The affine nonlinear state equation of the BDFM within an arbitrary rotating reference frame is also given for the first time. To achieve decoupling control over torque and flux, an input-output feedback linearization control strategy is used. A new control arithmetic, realized in the synchronous reference frame oriented by the control motor rotor flux, is developed. The necessary condition for implementation of the proposed control strategy is demonstrated. Simulation results confirm the feasibility and superb performance of the proposed strategy.

Abstract-This work is concerned with an extended state observer (ESO) based controller with parameter optimization for brushless doubly-fed machine (BDFM). An ESO based controller is proposed to deal with the complex inner coupling effect and external disturbance, which are hardly obtained in the practice. To reduce the workload of the parameters selection, an optimized parameter design method for the nonlinear ESO is proposed. Simulation results show that the proposed controller, which brings out an excellent performance and increases the robustness of the system, rejects the disturbances successfully and achieves the decoupling control of the system.