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http://dx.doi.org/10.6113/JPE.2013.13.5.737

High-Power-Density Power Conversion Systems for HVDC-Connected Offshore Wind Farms  

Parastar, Amir (Power Conversion Lab., Dept. of Electrical Eng., Yeungnam University)
Seok, Jul-Ki (Power Conversion Lab., Dept. of Electrical Eng., Yeungnam University)
Publication Information
Journal of Power Electronics / v.13, no.5, 2013 , pp. 737-745 More about this Journal
Abstract
Offshore wind farms are rapidly growing owing to their comparatively more stable wind conditions than onshore and land-based wind farms. The power capacity of offshore wind turbines has been increased to 5MW in order to capture a larger amount of wind energy, which results in an increase of each component's size. Furthermore, the weight of the marine turbine components installed in the nacelle directly influences the total mechanical design, as well as the operation and maintenance (O&M) costs. A reduction in the weight of the nacelle allows for cost-effective tower and foundation structures. On the other hand, longer transmission distances from an offshore wind turbine to the load leads to higher energy losses. In this regard, DC transmission is more useful than AC transmission in terms of efficiency because no reactive power is generated/consumed by DC transmission cables. This paper describes some of the challenges and difficulties faced in designing high-power-density power conversion systems (HPDPCSs) for offshore wind turbines. A new approach for high gain/high voltage systems is introduced using transformerless power conversion technologies. Finally, the proposed converter is evaluated in terms of step-up conversion ratio, device number, modulation, and costs.
Keywords
Offshore wind turbine; Power conversion system; Power density; Transformerless topology;
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