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http://dx.doi.org/10.7782/JKSR.2016.19.6.727

Modulation Technique of Dual Active Bridge Converter to Improve Efficiency of Smart Transformers in Railroad Traction System  

Kim, Sungmin (Dept. of Electronic System Eng., Hanyang University ERICA campus)
Lee, Seung-Hwan (School of Electrical and Computer Engineering, University of Seoul)
Kim, Myung-Yong (Metropolitan Transportation Research Center, Korea Railroad Research Institute)
Publication Information
Journal of the Korean Society for Railway / v.19, no.6, 2016 , pp. 727-735 More about this Journal
Abstract
Smart transformers are effective at reducing the weight and increasing the efficiency of traction systems for railroad applications. A smart transformer generally consists of rectifier modules and the Dual-Active-Bridge (DAB) converter modules. The efficiency of the smart transformer depends on not only the electrical characteristics, but also on the control method of the converter modules. Especially, a DAB converter has a high order degree of freedom of voltage modulation to control the power transferred through the high frequency transformer, and a voltage modulation method, are very critical for the efficiency of the DAB converter. This paper proposes a new voltage modulation method for the DAB converter to increase the efficiency in the low/medium power transfer condition. The proposed modulation method controls the reactive power in the high frequency transformer, making it zero. And, the switching loss is dramatically reduced by using the received converter module as a diode rectifier. The feasibility of the proposed modulation method is verified by computer simulation of the 900Vdc DAB converter power control.
Keywords
Solid state transformer; Smart transformer; Dual Active Bridge converter; Efficiency; Modulation;
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