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Energies 2015, 8(5), 4572-4586; doi:10.3390/en8054572

Experimental Results of a DC Bus Voltage Level Control for a Load-Controlled Marine Current Energy Converter

1
Department of Engineering Sciences, Uppsala University, P.O. box 534, 751 21 Uppsala, Sweden
2
Engineering and the Environment, University of Southampton, Southampton SO17 1BJ, UK
*
Author to whom correspondence should be addressed.
Academic Editor: Frede Blaabjerg
Received: 17 March 2015 / Revised: 10 May 2015 / Accepted: 13 May 2015 / Published: 21 May 2015
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Abstract

This paper investigates three load control methods for a marine current energy converter using a vertical axis current turbine (VACT) mounted on a permanent magnet synchronous generator (PMSG). The three cases are; a fixed AC load, a fixed pulse width modulated (PWM) DC load and DC bus voltage control of a DC load. Experimental results show that the DC bus voltage control reduces the variations of rotational speed by a factor of 3.5 at the cost of slightly increased losses in the generator and transmission lines. For all three cases, the tip speed ratio \(\lambda\) can be kept close to the expected \(\lambda_{opt}\). The power coefficient is estimated to be 0.36 at \(\lambda_{opt}\); however, for all three cases, the average extracted power was about \(\sim 19\)\%. A maximum power point tracking (MPPT) system, with or without water velocity measurement, could increase the average extracted power. View Full-Text
Keywords: marine current energy converter; control system; VACT; PMSG; load control marine current energy converter; control system; VACT; PMSG; load control
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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

Forslund, J.; Lundin, S.; Thomas, K.; Leijon, M. Experimental Results of a DC Bus Voltage Level Control for a Load-Controlled Marine Current Energy Converter. Energies 2015, 8, 4572-4586.

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