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

Author

Chen, Weijie ; Huang, Alex Q. ; Li, Cong ; Wang, Guibin ; Gu, Wanyi

Author_Institution

Jiangsu Provincial Key Laboratory of Smart Grid Technology and Equipment, School of Electrical Engineering, Southeast University, Nanjing, China

Volume

28

Issue

4

fYear

2013

fDate

Apr-13

Firstpage

2014

Lastpage

2023

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 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.

Keywords

DC-DC power converters; Educational institutions; Frequency conversion; Generators; Topology; Wind farms; Wind turbines; High power; MVDC grid; medium-voltage dc (MVDC) converter; offshore wind farm;

fLanguage

English

Journal_Title

Power Electronics, IEEE Transactions on

Publisher

ieee

ISSN

0885-8993

Type

jour

DOI

10.1109/TPEL.2012.2215054

Filename

6327370