Improved dynamic response strategy with dual phase-shift control for dual-active-bridge DC-DC converter

In this study, an improved dynamic response strategy with dual phase-shift (IDR-DPS) for dual-active-bridge (DAB) DC-DC converter is proposed to improve system performance and eliminate DC bias caused by power mutation. Firstly, a unique combination of independent variables about inner and outer phase shift duty ratios is calculated at a given reference power through combining the minimum current stress calculation method with DPS control, which makes DAB run efficiently. On this basis, a DC bias elimination method is proposed to eliminate DC bias current in half a switching period through modifying inner duty ratios during transient process and drive DAB to reach new steady state quickly. Finally, a DAB topology platform is built to perform experiments of proposed IDR-DPS strategy and traditional direct control, the effectiveness of the proposed strategy is verified by comparative experiments.