Abstract
This
paper points out a phenomenon of power backflow in traditional phase-shift (TPS) control of isolated
bidirectional full-bridge DC-DC converter (IBDC), and
analyzes the effects which backflow power act on power circulating flow and current stress. On this basis,
the paper proposes a novel extended-phase-shift (EPS) control of IBDC for power distribution
in microgrid. Compared
with TPS control, EPS control
not only expands regulating range of transmission power and enhances regulating flexibility, but also
reduces current stress and improves the system efficiency. The operation
principle of EPS control
and the operation modes of IBDC are analyzed in the paper. By establishing mathematical models of transmission power, backflow
power, and current stress, the paper comparatively
analyzes control performances of
TPS and EPS control. At last, experimental results
verify the excellent performance of EPS control and correctness of the
theoretical analysis.
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