Natural Switching Surface Boundary Control of Triple Active Bridge Converters: Achieving Unprecedented Dynamic Performance

This paper introduces an innovative approach to controlling Triple Active Bridge (TAB) converters by implementing a novel boundary control method. The proposed method leverages the Natural Switching Surface (NSS) to enhance the converter's dynamic performance. The paper conducts a thorough analysis of the TAB converters' inherent trajectories and establishes a framework within the normalized geometrical domain. This framework streamlines the design and execution of the boundary control mechanism. The state-space equation and the small-signal model of the TAB converter are mathematically derived. This is crucial for obtaining the NSS-based state trajectory and the boundary control law. The paper demonstrates that the proposed boundary control method allows the TAB converter to achieve both operational stability and a quick start-up stage simultaneously. The effectiveness of the proposed strategy is confirmed through closed-loop simulation.