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An Isolated Bidirectional Modular Multilevel DC/DC Converter for Power Electronic Transformer Applications
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  • Journal title : Journal of Power Electronics
  • Volume 16, Issue 3,  2016, pp.861-871
  • Publisher : The Korean Institute of Power Electronics
  • DOI : 10.6113/JPE.2016.16.3.861
 Title & Authors
An Isolated Bidirectional Modular Multilevel DC/DC Converter for Power Electronic Transformer Applications
Wang, Zhaohui; Zhang, Junming; Sheng, Kuang;
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 Abstract
With high penetration of renewable energies, power electronic transformers (PETs) will be one of the most important infrastructures in the future power delivery and management system. In this study, an isolated bidirectional modular multilevel DC/DC converter is proposed for PET applications. A modular multilevel structure is adopted as switching valves to sustain medium voltages to achieve modular design and high reliability. Only one high-frequency transformer is used in the proposed converter, which significantly simplifies the circuit and galvanic insulation design. A dual-phase-shift modulation strategy is proposed to regulate the output power and achieve a simple voltage balancing control. A down-scaled (2 kW/20 kHz) prototype is constructed to demonstrate the proposed converter and verify the control strategy. The experimental results comply with the theoretical analysis well, with the highest power efficiency reaching 97.6%.
 Keywords
DC/DC;Dual active bridge;Modular multilevel converter;Phase shift control;Power electronic transformer;Solid state transformer;Voltage balancing control;
 Language
English
 Cited by
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