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.
Highlights
Unregulated rivers, tides and other ocean currents are renewable energy sources with great potential across the globe
Research focusing on converting the power in free flowing water using a vertical axis turbine with a directly driven permanent magnet generator is being conducted by a research group at Uppsala University [5,6,7,8,9,10]
The concept investigated at Uppsala University uses a cross flow, fixed pitch vertical axis turbine directly connected to a nonesalient permanent magnet generator
Summary
Unregulated rivers, tides and other ocean currents are renewable energy sources with great potential across the globe. Research focusing on converting the power in free flowing water using a vertical axis turbine with a directly driven permanent magnet generator is being conducted by a research group at Uppsala University [5,6,7,8,9,10]. The concept investigated at Uppsala University uses a cross flow, fixed pitch vertical axis turbine directly connected to a nonesalient permanent magnet generator. A prototype has been deployed at the site consisting of a permanent magnet generator and directly connected vertical axis turbine. The research group has chosen this site with relatively low water speeds as successful utilization of sites with speeds in this range would increase the number of potential sites for hydro kinetic power conversion
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