Optimal Design Method of LLC-DAB Hybrid Bidirectional DC-DC Converter Based on Multi-objective Particle Swarm Optimization

The LLC-DAB hybird bidirectional converter, which combines the high efficiency of LLC resonant converter working in DCX mode with the advantage of flexible bidirectional power regulation of DAB converter using Sigma structure, has attracted the attention of many scholars in recent years. However, there are currently no specific criteria and guidelines for power distribution relationship. This paper takes efficiency and dynamics as the optimization goals, and proposed an optimization design method by introducing the multi-objective particle swarm optimization algorithm. The optimization results explain why the LLC resonant converter is chosen as the main power processing unit. Finally, the proposed optimized design method is verified by simulation.