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| Optimal Control Strategy of Dual Active Bridge DC-DC Converter with Combined Dual-Phase-Shift and Traditional-Phase-Shift Controls |
| Wu Junjuan, Meng Deyue ,Shen Yanfeng, Shen Hong ,Sun Xiaofeng |
| Key Lab of Power Electronics for Energy Conservation and Motor Drive of Hebei Province;Yanshan University Qinhuangdao 066004 China |
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Abstract In order to reduce the power losses of the dual active bridge(DAB) DC-DC converter,an optimal control strategy combining dual-phase-shift and traditional-phase-shift controls is proposed.It can minimize the root-mean-square(RMS) current flowing through the leakage inductor while ensuring zero-voltage-switching(ZVS) operation of all power switches.In this paper,the power transmission characteristics and soft-switching range under traditional phase-shift control and dual phase-shift control are first analyzed respectively.On this basis,by establishing the mathematical models of the RMS current,transmission power,and soft switching conditions,an optimal control trajectory is derived,which enables the DAB converter to operate in the minimum-RMS-current state while guaranteeing ZVS operation of all power switches.Thus,both the conduction and switching losses can be significantly reduced,and the optimal control of DAB is achieved.Finally,experimental results are provided to validate the correctness of theoretical analysis and feasibility of the control strategy.
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Received: 25 May 2015
Published: 02 November 2016
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2016, Vol. 31 
