Abstract
Bidirectional power converters for electric vehicles (EVs) have received much attention recently, due to either grid-supporting requirements or emergent power supplies. This paper proposes a hybrid modulation of the three-phase dual-active bridge (3ΦDAB) converter for EV charging systems. The designed hybrid modulation allows the converter to switch its modulation between phase-shifted and trapezoidal modes to increase the conversion efficiency, even under light-load conditions. The mode transition is realized in a real-time manner according to the charging or discharging current. The operation principle of the converter is analyzed in different modes and thus design considerations of the modulation are derived. A lab-scaled prototype circuit with a 48V/20Ah LiFePO4 battery is established to validate the feasibility and effectiveness.
Highlights
Fossil-fuel shortages and environmental concerns have strongly impacted the energy industries during the last decades
As one of the promising solutions to reduce the usage of the fossil fuel and carbon emissions, electric vehicles (EVs) are receiving much attention
The dual active bridge (DAB) converter is typically controlled by using so-called phase-shifted modulating method, in which two-level square waves with a designated phase shift are applied to the isolated transformer
Summary
Fossil-fuel shortages and environmental concerns have strongly impacted the energy industries during the last decades. The DAB converter is typically controlled by using so-called phase-shifted modulating method, in which two-level square waves with a designated phase shift are applied to the isolated transformer In this sense, power flow and its direction can be controlled by the phase difference. Power flow and its direction can be controlled by the phase difference This control method suffers from low conversion efficiency under light-load condition due to high conduction and switching losses. In [8,9], one of voltage pulses across on the transformer was replaced by a three-level pulse In this sense, the DAB converter can operate in a wide-range soft-switching mode and its conduction loss can be reduced by considering the reactive power. The converter is able to switch itseven modulation between phase-shifted modes autonomously to maintain efficiency in the light‐load condition. Converter with a 48V/20Ah LiFePO4 battery was established to verify the proposed method
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