WANG Yaoqiang,YAN Wuqing,NIE Fuquan,et al.Voltage gain analysis and optimization modulation strategy of single-stage dual active bridge AC-DC converter[J].Electric Power Automation Equipment,2025,45(09):103-109.
WANG Yaoqiang,YAN Wuqing,NIE Fuquan,et al.Voltage gain analysis and optimization modulation strategy of single-stage dual active bridge AC-DC converter[J].Electric Power Automation Equipment,2025,45(09):103-109. DOI: 10.16081/j.epae.202504010.
Voltage gain analysis and optimization modulation strategy of single-stage dual active bridge AC-DC converter
In order to solve the problems of limited soft switching range and large peak leakage inductance current in a wide voltage range of single-stage dual active bridge(DAB) AC-DC converter,an extended phase shift variable frequency modulation strategy considering voltage gain is proposed. The problem of large peak leakage inductance current in a wide voltage range of the secondary side extended phase shift modulation is analyzed,and then a dual mode modulation considering the voltage gain is proposed. On this basis,the soft switching conditions of the boost mode and the buck mode are analyzed,and the mathematical expressions of shift ratio and switching frequency are derived by constraining the leakage inductance current value at particular turn-on moments of switches. The modulation strategy enables full range soft switching and reduces the peak leakage inductance current to some extent. The feasibility of the proposed modulation strategy is proved by simulation and experimental verification.
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