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Analysis and Comparison of Medium Voltage High Power DC/DC Converters for Offshore Wind Energy Systems

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5 Author(s)
Chen, W. ; Jiangsu Provincial Key Laboratory of Smart Grid Technology and Equipment, School of Electrical Engineering, Southeast University, Nanjing, China ; Huang, A. Q. ; Li, C. ; Wang, G.
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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 high-efficiency 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.

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Power Electronics, IEEE Transactions on  (Volume:28 ,  Issue: 4 )