Decoupling Control of Multi-Active Bridge Converters using Linear Active Disturbance Rejection

Multi-active bridge converter (MAB) is a promising solution for integrating multiple renewable sources, storage, and loads for various applications. However, the MAB converter is challenging to control due to the inherent coupling between the port power flows. To that end, this paper presents a decoupling control strategy based on linear active disturbance rejection control (LADRC). The proposed controller observes the coupling disturbance using a linear extended state observer (LESO) and subsequently rejects the observed disturbance resulting in dynamic decoupling. Experiments conducted on a 2-kW 100 kHz Si-C based four-port MAB converter laboratory prototype illustrates the decoupling performance of the proposed control strategy. Compared to the traditional decoupling control strategy, the proposed approach is decentralized and model-independent, only requiring information regarding its order.