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Journal of Electrical and Computer Engineering
Volume 2013, Article ID 562548, 9 pages
http://dx.doi.org/10.1155/2013/562548
Research Article

Grid Connection of Wave Power Farm Using an N-Level Cascaded H-Bridge Multilevel Inverter

Division of Electricity, Department of Engineering Sciences, Swedish Centre for Renewable Electric Energy Conversion, Uppsala University, P.O. Box 534, 751 21 Uppsala, Sweden

Received 28 February 2013; Revised 21 May 2013; Accepted 22 May 2013

Academic Editor: Chuanwen Jiang

Copyright © 2013 Rickard Ekström and Mats Leijon. 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.

Abstract

An N-level cascaded H-bridge multilevel inverter is proposed for grid connection of large wave power farms. The point-absorber wave energy converters are individually rectified and used as isolated DC-sources. The variable power characteristics of the wave energy converters are discussed, and a method of mitigating this issue is demonstrated. The complete power control system is given in detail and has been experimentally verified for a single-phase setup of the 9-level inverter. Theoretical expressions of the power sharing between multilevel cells are derived and show good correspondence with the experimental results.