Fast Transient Current Control for Dual-Active-Bridge DC-DC Converters with Triple-Phase-Shift

Abstract

A kind of fast transient current control (FTCC) method for dual-active-bridge (DAB) dc-dc converters based on triple-phase-shift (TPS) control strategy is proposed in this paper to suppression the transformer DC bias when the power instruction or the load changes suddenly. The proposed control method brings the benefit of dynamic performance during bidirectional operation, which can achieve new steady state for inductor current, remove dc bias in the isolation transformer effectively within several cycles hence preventing transformer saturation. To analyze both steady and dynamic performance of the DAB converter by using the superposition theorem. According to the results of transient inductance current analysis, a dynamic control approach is proposed to limit the current transient interval in one switching period. Finally, the theoretical analysis is verified by experiments.