Abstract:
With vast applications of dc-dc converters in grids
and micro grids, the need of a vigorous converter with fault
tolerant capability becomes very important. Dual active bridge
(DAB) and series resonant converters (SRC) are extensively used
in smart transformers. Hence the fault tolerant feature is a must
in such converters in order to maintain a continuous operation
with voltage and power regulation. This paper proposes the
analysis of single or two switch open circuit fault on primary
and secondary side of DAB and SRC. The self-reliant nature of
converter in achieving fault tolerance with the help of phase shift
between its input and output side is also discussed. The proposed
analysis is tested on 1kW, 250V DAB and SRC prototype. The
proposed correction for open circuit fault on SRC is simulated
in PLECS software.
