Adaptive Sliding-Mode Observer for FOC of IM Drives Fed by Soft-VSI Topology: Wind Turbine Emulator Application

A novel adaptive sliding-mode observer scheme is introduced to enhance the field-oriented control of a Wind Tur-bine Emulator (WTE) designed around a three-phase induction motor fed by a soft-voltage source inverter (VSI) topology. A Mexican hat profile is applied as input for WTE system. The proposed adaptive observer efficiently detects rotor flux components and facilitates online estimation of motor resistive parameters, ensuring continuous tracking of rotor resistance. The analytical development of the sliding mode observer and the adaptive scheme, based on Lyapunov theory, is comprehensively explained. To validate the efficacy of the proposed adaptive observer structure, simulation results from a purpose-designed Matlab/Simulink model are presented.