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Energies 2015, 8(2), 808-820; doi:10.3390/en8020808

A Back-to-Back 2L-3L Grid Integration of a Marine Current Energy Converter

Division of Electricity, Swedish Centre for Renewable Electric Energy Conversion, Uppsala University, P.O. Box 534, 751 21 Uppsala, Sweden
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Academic Editor: Jens Peter Kofoed
Received: 18 November 2014 / Revised: 12 January 2015 / Accepted: 19 January 2015 / Published: 26 January 2015
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Abstract

The paper proposes a back-to-back 2L-3L grid connection topology for a marine current energy converter. A prototype marine current energy converter has been deployed by a research group at Uppsala University. The concept behind the prototype revolves around a fixed pitch vertical axis turbine directly connected to a permanent magnet synchronous generator (PMSG). The proposed grid connection system utilizes a well known and proven two level voltage source converter generator-side combined with a three-level cascaded H-bridge (CHB) multilevel converter grid-side. The multilevel converter brings benefits in terms of efficiency, power quality and DC-link utilization. The system is here presented for a single marine current energy converter but can easily be scaled up for clusters of marine current energy converters. Control schemes for both grid-side and generator-side voltage source converters are presented. The start-up, steady state and dynamic performance of the marine current energy converter are investigated and simulation results are presented in this paper. View Full-Text
Keywords: marine current energy converter; grid connection; three-level cascaded H-bridge marine current energy converter; grid connection; three-level cascaded H-bridge
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Apelfröjd, S.; Ekström, R.; Thomas, K.; Leijon, M. A Back-to-Back 2L-3L Grid Integration of a Marine Current Energy Converter. Energies 2015, 8, 808-820.

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