A Compact DC-DC Converter for Offshore Wind Farm Application


S. M. Alagab, S.B. Tennakoon and C.A. Gould




A DC-DC converter suitable for the grid integration of windfarms through a DC grid is presented. The operation is based on the Marx principle where charged capacitors are connected in series and parallel in turn to achieve the voltage transformation. The two inductors at the two ends of the converter are designed to resonate with the capacitors to create resonance forcing current zeros to enable zero current switching thereby reducing switching losses. The design of a 50 MW, 6kV/30kV DC-DC converter was carried out by analysis and simulation.

Published in: Renewable Energy & Power Quality Journal (RE&PQJ, Nº. 15)
Pages: 529-533 Date of Publication: 2017/04/25
ISSN: 2172-038X Date of Current Version:

REF: 382-17

Issue Date: April 2017
DOI:10.24084/repqj15.382 Publisher: EA4EPQ

Authors and affiliations

S. M. Alagab, S.B. Tennakoon and C.A. Gould
School of Creative Arts and Engineering, Staffordshire University. (United Kingdom)

Key word

DC–DC converter, IGBT, offshore windfarm


[1] S. M. Alagab and C. Gould, "Review of wind farm power collection schemes," In Power Engineering Conference (UPEC), 50th International Universities 2015.
[2] J. C. Mayo-maldonado, S. Member, J. C. Rosas-caro, and P. Rapisarda, "Modeling Approaches for DC - DC Converters With Switched Capacitors," vol. 62, no. 2, pp. 953-959, 2015.
[3] H. Taghizadeh, A. M. Cross, R. Whitehouse, and C. Barker, "Switched Capacitor DC-DC Converters for HVDC Applications," pp. 1-9.
[4] A. Ponniran, K. Orikawa, and J. Itoh, "Interleaved High Boost Ratio Marx Topology DC-DC Converter."
[5] M. D. Seeman and S. R. Sanders, "Analysis and Optimization of Switched-Capacitor {DC}amp;#x2013;DC Converters," 2006 IEEE Work. Comput. Power Electron., vol. 23, no. 2, pp. 216-224, 2006.
[6] X. Zhang and T. C. Green, "The Modular Multilevel Converter for High Step-Up Ratio DC-DC Conversion," Ind. Electron. IEEE Trans., vol. 62, no. 8, pp. 4925-4936, 2015.
[7] P. W. Lehn, B.-T. Ooi, and E. Veilleux, "Marx dc-dc converter for high-power application," IET Power Electron., vol. 6, no. April, pp. 1733-1741, 2013.
[8] A. Parastar, "High-Power Multilevel Step-Up DC / DC Converter for Offshore Wind Energy Systems," vol. 0046, no. c, pp. 4781-4788, 2015.
[9] S. Tennakoon, "Scalable Shunt Connected HVDC Tap Using the DC Transformer Concept," pp. 6-8.
[10] C. Cheng and L. He, "Flying-Capacitor-Clamped Five- Level Inverter Based on Switched-Capacitor Topology," vol. 0046, no. c, 2016.
[11] A. Parastar, A. Gandomkar, and J. Seok, "High- Efficiency Multilevel Flying-Capacitor Renewable Energy Systems," vol. 62, no. 12, pp. 7620-7630, 2015.
[12] J. Zhao, Y. Han, X. He, C. Tan, J. Cheng, and R. Zhao, "Multilevel circuit topologies based on the switched-capacitor converter and diode-clamped converter," IEEE Trans. Power Electron., vol. 26, no. 8, pp. 2127-2136, 2011.
[13] H. D. Offshore, "Multilevel Modular DC / DC Power Converter for Wind Energy Applications," vol. 62, no. 5, pp. 2879-2890, 2015.
[14] P. Lakshmanan, J. Liang, and N. Jenkins, "Assessment of collection systems for HVDC connected offshore wind farms," Electr. Power Syst. Res., vol. 129, pp. 75-82, Dec. 2015.
[15] ABB, "Surge currents for IGBT diodes," 2014.