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    • Speed Sensorless Model Predictive Torque Control of Induction Motors using A Modified Adaptive Full-order Observer
    Authors: Ngoc-Duc Nguyen; Nguyen Ngoc Ngoc Nam; Changwoo Yoon; Young Il Lee;  Advisor: -;  Co-Author: - (2021)

    In this paper, a new design of the state observer is proposed to reduce the unstable low-speed region of the adaptive full-order observer (AFO) based speed sensorless speed control of induction motors (IM). The proposed state observer is designed in z-domain rather than in s-domain following the pole-placement approach. The convergence rate of the proposed observer can be made faster than that of the IM poles without extra oscillation effects and the unstable low-speed region of AFO can be reduced to the zero-synchronous-frequency (ZSF) line. Also, a modified adaptation law of the AFO is derived to estimate the rotor speed. Based on the modified AFO, a continuous control set model predictive control (CCS-MPC) is designed for the inner-loop torque control. The cost function of the CC...