Multilevel Converter for Traction Applications: Small-Scale Prototype Tests Results | IEEE Journals & Magazine | IEEE Xplore

Multilevel Converter for Traction Applications: Small-Scale Prototype Tests Results


Abstract:

In ac-supplied traction systems (e.g., 15 kV, 16.7 Hz), the energy supplied by a conventional transformer results in large volume, high weight, and relatively low efficie...Show More

Abstract:

In ac-supplied traction systems (e.g., 15 kV, 16.7 Hz), the energy supplied by a conventional transformer results in large volume, high weight, and relatively low efficiency. In this paper, an ac-dc multilevel converter is presented that allows the use of a medium-frequency transformer in the input section of a traction drive. The proposed solution seems particularly well adapted to the different requirements (volume, weight, EMC, losses) of the electric traction domain. The system is studied from a theoretical point of view, starting from the basic module up to the entire converter structure. Simulation results and reduced-scale (10-kVA four-stage converter) experimental results are presented.
Published in: IEEE Transactions on Industrial Electronics ( Volume: 55, Issue: 5, May 2008)
Page(s): 2203 - 2212
Date of Publication: 02 May 2008

ISSN Information:


I. Introduction

Since about 1970, power electronics has played an important role in the domain of electric traction because it allows supplying the energy of catenaries to traction motors in a controlled way. Different topologies of power converters have been used according to available semiconductor technology, supply voltage, and frequency characteristics. Currently, for 15-kV 16.7-Hz applications the “state of art” topology of the power circuits for traction with three-phase motors is described in Fig. 1. The voltage of the catenaries is adapted by the main transformer to an appropriate level for the four-quadrant converter. This converter works like a rectifier and provides a continuous voltage to the dc link. A smoothing filter tuned at twice the supply frequency is mandatory. A three-phase inverter supplies a three-phase motor.

Typical ac traction chain.

References

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