The inherent cross-coupling between the ports of multi-active-bridge (MAB) converters leads to the undesirable propagation of transients, such as load changes, among the ports. However, existing strategies employed to minimize this effect do not consider the impact of load variations, treating them as external disturbances to be rejected by the feedback controller, which leads to a slow transient response. This paper presents a decoupled control approach for MABs that explicitly accounts for load changes, thereby enhancing transient performance. In the proposed strategy, additional feedforward terms accounting for load variations are added to the control scheme, and their avail in improving transient performance is analytically established. The proposed control strategy is outlined in a generic fashion and realized on a 4-port MAB. The improvement in transient response, in comparison to conventional approaches, is demonstrated through simulations and experiments on a 100V, 750W quad-active-bridge (QAB) converter.
