A Dual‐Active‐Bridge Three‐Port Converter Based on Model Predictive Control

ABSTRACT

To achieve flexible power flow allocation in distributed generation applications, an isolated dual‐active‐bridge (DAB) three‐port converter based on model predictive control (MPC) is proposed. By managing bidirectional power flow at the battery port, the converter maintains power balance among the photovoltaic (PV), battery, and load ports, with five operating modes. To extend the soft‐switching range and reduce computational complexity, an extended phase‐shift (EPS) modulation strategy with three degrees of freedom is introduced. Furthermore, a hybrid multi‐loop control strategy integrating PI and MPC is designed to coordinate inter‐port power management and enhance overall system performance. A theoretical analysis of the circuit topology, power transfer characteristics, modulation strategy, and control strategy is presented sequentially. Finally, an experimental setup is developed to validate the performance of the proposed converter under the designed control strategy. Experimental results demonstrate that the converter effectively achieves maximum power point tracking (MPPT) at the PV port and provides a stable output voltage, with the voltage THD at the AC port below 2.2%, indicating excellent steady‐state performance.