Abstract
The nonresonant single-phase dual-active-bridge (NSDAB) dc–dc converter has been increasingly adopted for isolated dc–dc power conversion systems. Over the past few years, significant research has been carried out to address the technical challenges associated with modulations and controls of the NSDAB dc–dc converter. The aim of this paper is to review and compare these recent state-of-the-art modulation and control strategies. First, the modulation strategies for the NSDAB dc–dc converter are analyzed. All possible phase-shift patterns are demonstrated, and the correlation analysis of the typical phases-shift modulation methods for the NSDAB dc–dc converter is presented. Then, an overview of steady-state efficiency-optimization strategies is discussed for the NSDAB dc–dc converter. Moreover, a review of optimized techniques for dynamic responses is also provided. For both the efficiency and dynamic optimizations, thorough comparisons and recommendations are provided in this paper. Finally, to improve both steady-state and transient performances, a combination approach to optimize both the efficiency and dynamics for an NSDAB dc–dc converter based on the reviewed methods is presented in this paper.
Highlights
T HE nonresonant single-phase dual-active-bridge (NSDAB) dc–dc converter was first proposed around 1990s for realizing high-efficiency and high-power-density dc–dc power conversions [1], [2]
This paper offers a comprehensive overview of modulation methods, efficiency-optimization schemes, and dynamic-optimization strategies of the NSDAB dc–dc converter, and thorough comparisons of different optimization methods are conducted
The correlation analysis of typical phase-shift modulation methods, including the SPS, DSP, EPS, and TPS modulation methods, is illustrated, which can explain why the TPS modulation method can always provide the best efficiency for an NSDAB dc–dc converter
Summary
T HE nonresonant single-phase dual-active-bridge (NSDAB) dc–dc converter was first proposed around 1990s for realizing high-efficiency and high-power-density dc–dc power conversions [1], [2]. The main intention of this paper is to provide a better understanding of the NSDAB converter control and operation in terms of both the static and dynamic performance, and comprehensively reviews the most recent advancements and contributions on the phase-shift modulations, efficiencyoptimization methods, and dynamic-improvement techniques of the NSDAB dc–dc converter. To provide a better understanding of the phase-shift modulation, all possible phase-shift patterns are presented, and the correlation analysis of the typical phase-shift modulation methods is analyzed. This is followed by a thorough review of latest contributions to the efficiency-optimization strategies for the NSDAB converter.
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