Hybrid Modulation Strategy for Dual Active Bridge Converters in High-Voltage Charging Infrastructures

This paper proposes a hybrid modulation strategy for Dual Active Bridge (DAB) converters in high-voltage, medium-power charging infrastructures. Traditional modulation techniques are characterized by limitations or high computational cost when high efficiency values across wide voltage ranges are required. A new modulation strategy is proposed to overcome these issues. In detail, it selects the optimal modulation technique based on the real-time working conditions of the charging infrastructure in terms of processed power and DAB input/output voltages. Numerical analysis confirms that the proposed modulation strategy enables an increase in energy efficiency for a DAB in high-voltage, medium-power applications.