In this paper, schemes of direct torque control (DTC) for railway traction over the whole speed range are proposed. In order to observe the phase angle and amplitude of stator flux accurately, a flux observer based on a U-N model is presented. In the low-speed range, the locus of stator flux is controlled to be a circle to reduce torque ripples, and the schemes of start-up and the selection method of voltage vectors are proposed in this paper. In medium-speed and high-speed range, the locus of stator flux is controlled to be hexagonal to reduce switching frequency. In order to obtain good steady state and dynamic performance, a DTC scheme under square wave conditions in the high-speed range is proposed. All of the methods and schemes are implemented on a 500 kW converter and a 190 kW induction motor, and are proved to be effective by experiment results.


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    Voltage-fed inverter drive with single-sided linear induction motor for railway traction

    Masada, E. / Fujisaki, K. / Chongshu, X. | Tema Archive | 1984





    Performance Evaluation of an Induction Motor Drive for Traction Application

    Lino di Leonardo / Mircea Popescu / Giuseppe Fabri et al. | BASE | 2019

    Free access