Study of Transient DC Bias Analysis and Suppression Methods in Dual Active Bridge Converter

doi:10.11985/2018.07.002

Abstract

Abstract:

Based on the principle of dual phase shift control, the DC bias appearing in high frequency transformer’s ac current caused by the load transient is analyzed in dual active bridge converter(DAB). Without any extra hardware, such as block DC capacitor, the dual phase shifting digital control strategy based on the asymmetric phase is put forward. By using a single PI closed loop control system based on predictive current control, the control requirements for suppression of DC bias current not only can be met, but also many difficult problems such as PI control loop control parameters setting can be solved. The results of simulation and experiment show a good perform on the suppression of DC bias, and this methods further provide a good theoretical and experimental basis for the single-phase voltage source type dual active bridge DC-DC converter to realize the optimal control for storage energy system.

Key words: Dual active bridge DC-DC, DC bias current, asymmetric phase shift control, predictive current control

CLC Number:

TM315

Lei Tao,Li Longchun,Wu Cenying,Zhang Xiaobin. Study of Transient DC Bias Analysis and Suppression Methods in Dual Active Bridge Converter[J]. Journal of Electrical Engineering, 2018, 13(7): 8-15.

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参数	额定值	参数	额定值
高压侧电压V₁/v	270	电感L/μH	12
低压侧电压V₂/v	28	负载阻值R/Ω	1.568
高压侧电容C₁/μF	470	输入等效阻值R_s/Ω	0.1
低压侧电容C₂/μF	1 000	开关频率/kHz	40
内移相占空比D₁	0.33	外移相占空比D₂	0.6