Multi‐Objective Optimisation Strategy Under Triple Phase‐Shift Modulation for DAB Converter With Extended ZVS Region and Improved Light‐load Efficiency

The dual‐active‐bridge (DAB) converter has garnered significant research interest owing to its galvanic isolation, simple circuit topology, and ease of modularisation, making it an effective interface circuit for integrating diverse energy sources. However, conventional DAB operation involves multiple working regions with limited efficiency and narrow soft‐switching ranges. To improve high‐efficiency performance under light‐load conditions, this paper employs triple phase‐shift (TPS) modulation as a case study and introduces a novel multi‐objective optimisation strategy, which is designed to concurrently optimise both the peak and root‐mean‐square (RMS) currents while extending the zero‐voltage‐switching (ZVS) range. Consequently, compared to existing modulation schemes, the proposed strategy effectively reduces overall power losses. It also achieves a noticeable reduction in RMS and peak currents, resulting in superior light‐load efficiency. Furthermore, a significant expansion of the ZVS operating range is realised. Finally, a hardware prototype based on the DAB topology has been built to experimentally validate the effectiveness of the proposed optimisation method.