Abstract—Offshore
wind farm with an internal medium-voltage dc (MVDC)-grid collection connected
HVDC transmission may be an option to harvest offshore wind energy. High-power
MV dc/dc converters with high-step-up conversion ratios are the key components
for the internal MVDC grid. In this paper, a highefficiency step-up resonant
switched-capacitor converter for offshore wind energy system is studied, which
is characterized by the soft-switching condition for all switches and diodes.
This significantly reduces switching losses and higher switching frequency is
feasible to reduce the overall system volume and weight. The comparisons with
other two kinds of topologies are also presented; moreover, the possible specification
requirements of high power MV dc/dc converters are analyzed and set. The
operation principle of the proposed converter has been successfully verified by
simulation and experiment results.
(Index
Terms—High power, medium-voltage dc (MVDC) converter, MVDC grid, offshore wind
farm.)
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