Experimental discussions on operating frequencies of a bidirectional isolated DC-DC converter for a battery energy storage system

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Tan N.M.L.
Abe T.
Akagi H.
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This paper presents a high-efficiency bidirectional isolated dc-dc converter for a battery energy storage system connected to the grid. It discusses the design of the converter, an optimal operating frequency range, and the optimal dead times for a 6-kW, full-bridge, bidirectional isolated dc-dc converter with focus on improving converter efficiency. This paper also provides a power-loss breakdown of the dc-dc converter at the rated power. The optimal frequency range of the dc-dc converter is defined by making its frequency-dependent loss equal to its frequency-independent loss. The optimal dead time is defined by one-fourth of the resonant period. The maximum efficiency of the dc-dc converter operating at 4 kHz is measured at 98.1% during battery charging and at 98.2% during battery discharging. The converter maintains a high efficiency of more than 97% in a wide range of power transfer. � 2013 IEEE.
DC-DC converters , Efficiency , Electric drives , Energy conversion , Energy storage , Optimization , Battery energy storage systems , Bidirectional isolated dc-dc converter , Converter efficiency , Frequency-dependent loss , Maximum Efficiency , Operating frequency , Optimal frequency , Power transfers , HVDC power transmission