Nonactive power loss minimization in a bidirectional isolated DC-DC converter for distributed power systems

Huiqing Wen*, Weidong Xiao, Bin Su

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

162 Citations (Scopus)


Originated from analyzing nonactive power loss, a novel optimization method and modulation solution for bidirectional isolated dual-active-bridge (DAB) dc-dc converters are proposed in order to achieve high efficiency in a wide operating range. A comprehensive nonactive power loss model is developed, including both the nonactive components delivered back to the source and from the load. This paper points out that when the minimum nonactive power loss is achieved, zero-voltage soft switching can be naturally fulfilled. The optimal phase-shift pair obtained by the proposed method can keep low values of both root mean square (RMS) current and circulating power. Rather than using ideal power flow analysis, the nonactive power loss model directly embodies practical nonideal factors, including device voltage drops. Based on the analysis, an extended dual phase shift is proposed, and different operation cases are analyzed with comparison of performance indices. Experimental tests verify the theoretical analysis and show effectiveness of the proposed approach to achieve nonactive power loss minimization and efficiency improvement.

Original languageEnglish
Article number6785986
Pages (from-to)6822-6831
Number of pages10
JournalIEEE Transactions on Industrial Electronics
Issue number12
Publication statusPublished - 1 Dec 2014


  • Distributed power system
  • dual-active-bridge (DAB) converter
  • nonactive power loss
  • phase-shift control


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