Abstract In order to reduce the current stress, improve the efficiency and enhance the dynamic response of dual-active-bridge (DAB) DC-DC converters, a current stress optimized scheme with model-based feedforward is proposed in this paper. Through developing the discrete model of output voltage, introducing feedforward control and combining the current stress optimized calculation, the efficiency and dynamic performance of DAB converters under the input voltage fluctuation and load disturbance conditions can be improved significantly. In addition, the proposed control scheme can effectively improve the starting characteristics of the converter, so that the output voltage reaches the desired value directly without overshoot. Finally, three control schemes, i.e. traditional voltage-closed control based on single phase-shift, current stress optimized control based on dual phase-shift and the proposed current stress optimized scheme with model-based feedforward, are compared in a DAB converter scale-down experimental prototype based on SiC MOSFET with TMS320F28335 as the core controller. The experimental results have verified the correctness and effectiveness of the proposed control scheme.
An Feng,Yang Kexin,Wang Song等. Current Stress Optimized Scheme with Model-Based Feedforward for Dual-Active-Bridge DC-DC Converters[J]. Transactions of China Electrotechnical Society, 2019, 34(14): 2946-2956.
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2019, Vol. 34 
