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Series-Connected High Frequency Converters in a DC Microgrid System for DC Light Rail Transit

Author

Listed:
  • Bor-Ren Lin

    (Department of Electrical Engineering, National Yunlin University of Science and Technology, Yunlin 640, Taiwan)

Abstract

This paper studies and presents a series-connected high frequency DC/DC converter connected to a DC microgrid system to provide auxiliary power for lighting, control and communication in a DC light rail vehicle. Three converters with low voltage and current stresses of power devices are series-connected with single transformers to convert a high voltage input to a low voltage output for a DC light rail vehicle. Thus, Metal-Oxide-Semiconductor Field-Effect Transistors (MOSFETs) with a low voltage rating and a turn-on resistance are adopted in the proposed circuit topology in order to decrease power losses on power switches and copper losses on transformer windings. A duty cycle control with an asymmetric pulse-width modulation is adopted to control the output voltage at the desired voltage level. It is also adopted to reduce switching losses on MOSFETs due to the resonant behavior from a leakage inductor of an isolated transformer and output capacitor of MOSFETs at the turn-on instant. The feasibility and effectiveness of the proposed circuit have been verified by a laboratory prototype with a 760 V input and a 24 V/60 A output.

Suggested Citation

  • Bor-Ren Lin, 2018. "Series-Connected High Frequency Converters in a DC Microgrid System for DC Light Rail Transit," Energies, MDPI, vol. 11(2), pages 1-13, January.
    • Handle: RePEc:gam:jeners:v:11:y:2018:i:2:p:266-:d:128300
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    Cited by:

    1. Cheng Lv & Xiaodong Zheng & Nengling Tai & Shi Chen, 2018. "Single-Ended Protection Scheme for VSC-Based DC Microgrid Lines," Energies, MDPI, vol. 11(6), pages 1-17, June.

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