Research on Reverse Power Transmission of Bidirectional DC-DC Converter Based on Model Predictive Control
摘要
This paper investigates the power reverse transmission of a phase-shifted full-bridge bidirectional converter based on Model Predictive Control (MPC). The topological structure is analyzed, and the voltage relationship between input and output during power reverse transmission is derived. Aiming at the voltage spike problem caused by the charging of parasitic capacitance by the input inductor current during the turn-off of switching devices and the mismatch between the transformer leakage inductance and the input inductor current, a control strategy is proposed. The strategy predicts the input inductor current based on MPC, dynamically adjusts the conduction duty cycles of switching devices on the primary and secondary sides to achieve pre-charging of the leakage inductance. By designing a multi-objective cost function including current tracking, control smoothness, and circulating current suppression, the light-load circulating current and current stress of switching devices are significantly reduced. The proposed control strategy demonstrates shorter regulation time and non-overshooting dynamic performance under load transients, which is finally verified by simulations.