Minimize Reactive Power Losses of Dual Active Bridge Converters using Unified Dual Phase Shift Control

Wen, HQ;Su, B

[Wen, Huiqing] Xian Jiaotong Liverpool Univ, Dept Elect & Elect Engn, Suzhou, Peoples R China.
[Wen, Huiqing] Xi An Jiao Tong Univ, State Key Lab Elect Insulat & Power Equipment, Xian, Peoples R China.
[Su, Bin] State Grid Corp China, Hangzhou Elect Power Bur, Hangzhou, Zhejiang, Peoples R China.

JOURNAL OF ELECTRICAL ENGINEERING & TECHNOLOGY

Volume:12 Issue:2Pages:654-664

DOI:10.5370/JEET.2017.12.2.654

Publication Year:2017

JCR:Q4

CAS JCR:4区

ESI Discipline:ENGINEERING

Latest Impact Factor:1.069

Document Type:Journal Article

Identifier:http://hdl.handle.net/20.500.12791/002654

Abstract

This paper proposed an unified dual-phase-shift (UDPS) control for dual active bridge (DAB) converters in order to improve efficiency for a wide output power range. Different operating modes of UDPS are characterized with respect to the reactive current distribution. The proposed UDPS has the same output power capability with conventional phase-shift (CPS) method. Furthermore, its implementation is simple since only the change of the leading phase-shift direction is required for different operating power range. The proposed UDPS control can minimize both the inductor rms current and the circulating reactive current for various voltage conversion ratios and load conditions. The optimal phase-shift pairs for two bridges of DAB converter are derived with respect to the comprehensive reactive power loss model, including the reactive components delivered from the load and back to the source. Simulation and experimental results are illustrated and explained with details. The effectiveness of the proposed method is verified in terms of reactive power losses minimization and efficiency improvement.

Keywords

Phase shift control Reactive power loss Power characterization DC-DC converter

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