Multiswitch-Leg DAB Converter for Low $dv/dt$ at High Operating Frequency for MVDC Systems

The medium voltage (MV) high-power dc–dc isolated converter topologies are gaining huge interest as they offer high efficiency and power density. In the recent past, one of the major research areas for such system has been the reduction of rate of change of voltage (
$dv/dt$
) across the transformer windings and voltage stress across switches. This letter proposes a multiswitch-leg dual active bridge converter topology to reduce the
$dv/dt$
across the transformer windings at high switching frequency (
${{f}_s}$
) operation. The proposed converter is scalable based on the MVdc-bus voltage and operates at simplest operating principle with zero circulating current. The proposed converter also features zero-voltage switching operation, which improves the efficiency. The operation of the proposed converter is verified by the experimental result of lab prototype.