A Linearised Approach for Voltage Controller Design of Inherent Decoupled Triple Active Bridge Converters

The present study proposes a piecewise linearization approach for synthesizing a voltage controller in an inherently decoupled triple active bridge (TAB). The developed controllers demonstrate high dynamic performance and decoupled rejection to step load variation on the two TAB output ports across a broad operational range. The proposed TAB converter control strategy was first simulated and then experimentally validated. The experimental results confirm the practicality of using an inherent decoupled TAB to manage independently power transfer between the two output ports employing a large signal linearisation approach, achieving good dynamic performance and decoupling condition between the two output ports, even in the presence of step-load variations of 80% of rated power.