Abstract
The dual-active-bridge isolated bidirectional DC-DC converter (DAB-IBDC) is a crucial device for galvanic isolation, voltage conversion, power transfer, and buses connection in the DC power conversion systems. Phase-shift modulation is an effective method to improve DAB-IBDC performance. However, the phase-shift control strategies in the existing literatures mainly optimize the single characteristic of DAB-IBDC. In this paper, to realize a comprehensive optimization for DAB-IBDC performances, reducing high-frequency-link (HFL) reactive power, reducing current stress and improving efficiency simultaneously, a multi-objective optimization strategy based on dual-phase-shift (DPS) control is proposed. The power characterization, current stress and power loss in DAB-IBDC are investigated, and the control principle and framework of proposed multi-objective optimization DPS control strategy is described. The representative experiments in DAB-IBDC prototype are presented to verify correctness and superiority of the proposed strategy.
Highlights
With the wide application of direct-current (DC) renewable power sources, DC loads, and storage equipment, DC power conversion systems (PCS) have considerable potential for engineering applications [1,2,3,4]
Under both SPS and DPS control, the conduction loss PCON for DAB-isolated bidirectional DC-DC converters (IBDCs) are presented in Fig. 5(a), and they are normalized by PCON = 2(1 + n2) RCON IL-max2
The DAB-IBDC plays a crucial role in DC distribution networks for realizing galvanic isolation, voltage conversion, power transfer, and bus connection
Summary
With the wide application of direct-current (DC) renewable power sources, DC loads, and storage equipment, DC power conversion systems (PCS) have considerable potential for engineering applications [1,2,3,4]. Other phase-shift modulation strategies are proposed in [25,26,27,28] to eliminate reactive power, reduce the peak and root-mean-square (RMS) values of HFL current, and enhance light-load performance for DAB-IBDC, respectively. Most existing phase-shift control strategies only realize the performance optimization in a single aspect (e.g., current stress, reactive power elimination, ZVS behavior, or efficiency performance of DAB-IBDC).
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