RESEARCH ARTICLE

Solid-state transformer-based new traction drive system and control

  • Jianghua FENG ,
  • Jing SHANG ,
  • Zhixue ZHANG ,
  • Huadong LIU ,
  • Zihao HUANG
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  • CRRC Zhuzhou Institute Co., Ltd., Zhuzhou 412001, China

Received date: 26 Dec 2016

Accepted date: 11 May 2017

Published date: 11 Jun 2018

Copyright

2018 Higher Education Press and Springer-Verlag GmbH Germany

Abstract

A new type of traction drive system consisting of solid-state traction transformer (SSTT), inverter unit, auxiliary inverter, traction motor and other key components is built in order to suit the demand of developing the next-generation electric traction system which will be efficient and lightweight, with high power density. For the purpose of reducing system volume and weight and improving efficiency and grid-side power quality, an efficient SSTT optimized topology combining high-voltage cascaded rectifiers with high-power high-frequency LLC resonant converter is proposed. On this basis, an integrated control strategy built upon synchronous rotating reference frame is presented to achieve unified control over fundamental active, reactive and harmonic components. The carrier-interleaving phase shift modulation strategy is proposed to improve the harmonic performance of cascaded rectifiers. In view of the secondary pulsating existing in a single-phase system, the mathematical model of secondary power transfer is built, and the mechanism of pulsating voltage resulting in beat frequency of LLC resonant converter is revealed, so as to design optimum matching of system parameters. Simulation and experimental results have verified that the traction system and control scheme mentioned in this paper are reasonable and superior and that they meet the future application requirements for rail transit.

Cite this article

Jianghua FENG , Jing SHANG , Zhixue ZHANG , Huadong LIU , Zihao HUANG . Solid-state transformer-based new traction drive system and control[J]. Frontiers of Mechanical Engineering, 2018 , 13(3) : 411 -426 . DOI: 10.1007/s11465-018-0467-0

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