A Novel Fast Transient Current Scheme for Three Phase Dual Active Bridge with Asymmetrical Phase-Shift Control

It is well-known issue that dc bias and oscillations will be introduced into phase current and dc current when the transmission power and control variables of three phase dual active bridge (3ph-DAB) converter have the abrupt changes. It will cause the magnetic saturation problem and degrade the dynamic response seriously. To solve this issue, this paper proposes a novel fast transient current control scheme with asymmetrical three phase (APS) control. By choosing suitable transient phase shift angles, the proposed method can greatly suppress the dc bias and overshoot of phase current and improve the transient performance significantly. It is presented to make 3ph-DAB transit from initial steady state to target steady state within one step through the proposed method and space-vector theory. The simulation results verify the effectiveness of proposed scheme.