A Dual Phase-shift Control Strategy for Reducing Back flow Power of the Dual Active Bridge DC-DC Converter

doi:10.3969/j.issn.1000-7229.2019.03.012

Abstract

Abstract: In order to reduce the backflow power of the dual active bridge (DAB) DC-DC converter， mathematical analysis of dual active bridge DC-DC converter is carried out and the relationship between backflow power and transmission power， voltage conversion ratio is derived. According to the account of transmission power， the optimal shift angle in each range is obtained， and we propose an improved dual phase-shift control strategy which can reduce the backflow power of the dual active bridge DC-DC converter and in a certain transmission power range can satisfy soft switching condition. Simulation is carried out on the MATLAB/Simulink platform. The simulation results show that， compared with the traditional single phase shift (SPS)， the proposed dual phase-shift control strategy can obviously reduce the backflow power and can achieve zero backflow power in a certain transmission power range.

Key words: dual active bridge (DAB), DC-DC converter, dual phase shift, soft switching, backflow power

CLC Number:

TM 46

GAO Xuanjie， MIAO Hong， ZENG Chengbi. A Dual Phase-shift Control Strategy for Reducing Back flow Power of the Dual Active Bridge DC-DC Converter[J]. Electric Power Construction, 2019, 40(3): 94-101.

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