Multiple Natural Switching Surface Boundary Control of the Dual Active Bridge Converter

For improving the dynamic performance of the dual active bridge (DAB) converter, the multiple natural switching surface (MNSS) boundary control is proposed. By detailed analyzing all potential natural switching surface of the DAB converter, and corresponding mathematical model has been presented. Then, possible combination of natural switching surface, and sequence of those natural switching surface is proposed. On this basis, the operation principle of steady state and dynamic state operation under MNSS boundary control is analyzed. In additional, the potential of current limitation control based on MNSS control is also discussed in this paper. Both simulation and experiment results verify the MNSS control can significantly improve the dynamic response, especially for voltage changing condition such as step change of output voltage or state up stage.