Two-Degree-of-Freedom IMC-Based Decoupled Current Control for Unipolar Sinusoidal Excited SRM Drives

This paper presents a two-degree-of-freedom in-ternal model control (2DOF-IMC) strategy for switched re-luctance motors (SRMs) with unipolar sinusoidal excitation. The inherent cross-coupling electromotive force (EMF) in the rotating reference frame of the SRM, which varies with rotor position, poses significant challenges for effective current decoupling and control. To address these challenges, a 2DOF-IMC approach is proposed, incorporating a dynamic voltage compensation model specifically designed for SRMs. A compre-hensive stability analysis and parameter tuning are performed to improve system robustness against parameter mismatches and external load disturbances. Simulation results show that the proposed 2DOF-IMC strategy outperforms traditional de-coupled PI control, resulting in reduced current tracking errors, improved disturbance rejection, and faster dynamic responses under varying operating conditions.