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Title
Japanese: 
English:A boost conversion system consisting of multiple DC-DC converter modules for interfacing wind farms and HVDC transmission 
Author
Japanese: 佐野 憲一朗, Masahiro Takasaki.  
English: Kenichiro Sano, Masahiro Takasaki.  
Language English 
Journal/Book name
Japanese: 
English:2013 IEEE Energy Conversion Congress and Exposition, ECCE 2013 
Volume, Number, Page         pp. 2613-2618
Published date Sept. 2013 
Publisher
Japanese: 
English: 
Conference name
Japanese: 
English:2013 IEEE Energy Conversion Congress and Exposition, ECCE 2013 
Conference site
Japanese: 
English: 
Official URL https://ieeexplore.ieee.org/document/6647038/
 
DOI https://doi.org/10.1109/ECCE.2013.6647038
Abstract Recent offshore wind farms have increased their capacity and distance from the shore. To transmit the bulk power to the shore, some projects employ high voltage dc (HVDC) transmissions. Such wind farm has a local ac grid in their site to collect power from each generator, and then the voltage is increased by bulky and heavy step-up transformers. In order to simplify and to reduce the weight of the offshore facilities, dc collection grids have been also considered in recent years. However, a technical issue is the development of high voltage and high power converters to boost the dc voltage for the HVDC transmissions. This paper proposes a novel dc boost conversion system for interfacing the wind farms and the HVDC transmissions. The proposed boost conversion system consists of multiple isolated dc-dc converter modules. The modules are connected in parallel in the wind farm side and in series in the HVDC transmission side in order to realize high power and high step-up ratio. A control method is also developed for maintaining the voltage of the offshore power system and keeping equal voltage sharing among the series connected modules. Computer simulations are carried out to verify the basic operation characteristics of the proposed system.

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