Impact of Single Phase Shift and Dual Phase Shift Control Strategies on Power Decoupling in Triple Active Bridge Converter

The popularity of the Triple Active Bridge (TAB) converter is attributed to its magnetically coupled system and its facilitation of the integration of DC sources with varying voltage levels. A potential application for TAB converters is identified in multi battery charging systems, albeit with inherent advantages and disadvantages. In this paper, the focus is placed on the mathematical analysis of challenges encountered in the TAB converter. The first approach involves addressing the cross-coupling issue through Single-Phase Shift (SPS) control and implementing strategies to achieve decoupling. The second approach focuses on applying Dual-Phase Shift (DPS) control and analyzing its effect on the decoupled system. In this article, to achieve decoupling in SPS control, the primary inductor is set to zero, yet it is observed that cross-coupling still increases when the system is controlled using DPS in an open-loop configuration. Although the issue of cross-coupling persists with DPS control in an open loop, it is effectively managed when using a closed-loop control strategy. To validate the impact of SPS and DPS control on decoupling, a 3.5 kW system is carefully modelled in MATLAB Simulink. Furthermore, practical validation is conducted through the development of a 500 W hardware prototype, confirming the effectiveness of the proposed decoupling approach.