Control Strategy for a Triple Active Bridge Converter: a Generalized Average Model Approach

This paper presents a control strategy for the triple active bridge (TAB) converter based on the generalized average model (GAM). The TAB operation is summarized and the GAM derivation for the TAB is presented in detail. A control strategy based on the sum of feedback (FB) and feedforward (FF) terms is proposed to control the voltage at the output ports. The FB term comes from a PI controller designed using the pole placement method. On the other hand, the FF term depends on the load currents measurements and the transformer currents estimation obtained from GAM. Simulation results are presented to validate the control effectiveness. Also, the proposed control strategy is compared to the PI controller alone, exhibiting an improvement in the dynamic response.