Model Predictive Control-Based Power Distribution Strategy for Dual Active Bridge

Dual Active Bridge converter (DAB) is widely used in medium and high-power photovoltaic storage-type distributed hybrid microgrids and interconnected DC microgrids due to its symmetrical structure, suitability for highpower scenarios, electrical isolation, and bidirectional energy flow. In DC microgrid, DAB typically employs a voltage loop PID plus droop control method to achieve the grid connection of multiple energy storage devices. However, this method has drawbacks such as poor dynamic performance, easy overshoot, and a decline in bus voltage. To address these issues, this paper uses Model Predictive Control (MPC) as the underlying control for the dual active bridge to improve the converter's response speed and steady-state performance. Then, equivalent load is used to improve the model predictive control, achieving power distribution among multiple dual active bridge converters while maintaining bus voltage stability. Finally, a simulation model is built to verify the effectiveness of the control strategy.