Solid State Transformer를 위한 양방향 Dual Active Bridge DC-DC 컨버터의 설계 기법 최현준1, 이원빈1, 정지훈✝
Practical Design Methodology of Dual Active Bridge Converter as Isolated
Bi-directional DC-DC Converter for Solid State Transformer
Hyun-Jun Choi1, Won-Bin Lee1, and Jee-Hoon Jung
Abstract
Proper design guides are proposed for a practical dual-active bridge (DAB) converter based on the
mathematical model on the steady state. The DAB converter is popular in bidirectional application due to its
zero-voltage capability and easy bidirectional operation for seamless control, high efficiency, and performance.
Some design considerations are taken to overcome the limitation of the DAB converter. The practical design
methodology of power stage is discussed to minimize the conduction and switching losses of the DAB
converter. Small-signal model and frequency response are derived and analyzed based on the generalized
average method, which considers equivalent series resistance, to improve the dynamics, stability, and reliability
with voltage regulation of the practical DAB converter. The design of closed-loop control is discussed by the
derived small-signal model to obtain the pertinent gain and phase margin in steady-state operation.
Experimental results of a 3.3 kW prototype of DAB converter demonstrate the validity and effectiveness of the
proposed methods.
Keywords: SST(Solid State Transformer), DAB(Dual Active Bridge) converter, BDC(Bi-Directional Converter),
ZVS(Zero Voltage Switching), Small signal model, 2 pole 1 zero(2P1Z) controller
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