A Decentralized Control for a Triple Active Bridge Converter Integrating PV and ESS

This paper introduces a decentralized control strategy for an isolated Triple Active Bridge (TAB) bidirectional converter integrating Photovoltaic (PV) and Energy Storage Systems (ESS). The proposed control method ensures a well-regulated DC bus voltage and is implemented using a decoupled control approach. The methodology considers variations in solar irradiation for PV and the State-of-Charge (SOC) of the ESS. In the proposed approach, when the ESS SOC is less than 100%, the PV output is maximized by operating it in maximum power point (MPP) mode and the ESS is charged or discharged based on load conditions. However, when ESS is fully charged, the control strategy switches PV operation to non-MPP mode, ensuring a well-regulated DC bus voltage. Switching simulations demonstrate the efficacy of the proposed method across a wide range of operating conditions for a TAB integrated into a DC microgrid (MG). Hardware experimental results further validate the performance and effectiveness of the decentralized control approach.