Flatness-Based Control Design for Two-Mass System Using Induction Motor Drive Fed by Voltage Source Inverter with Ideal Control Performance of Stator Current

In many practical applications, the electrical drive system, which is composed of a motor connected to a load machine through a shaft, is regarded as a two-mass system with flexible shaft, i.e., when long shaft and large load side mass are used. In this case, the oscillation caused by the finite stiffness and damping coefficients of the shaft may degrade the performance of the drive system. Hence, this paper focuses on control design for two-mass systems using induction motor drive fed by a voltage source inverter. By using flatness-based controller and utilizing the deadbeat response of the stator current loop, the performance of the drive system is improved not only in nominal speed range but also in field weakening range. The validity and effectiveness of the proposed method are verified by simulations.