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

Author

Listed:
  • Johan Forslund

    (Department of Engineering Sciences, Uppsala University, P.O. box 534, 751 21 Uppsala, Sweden)

  • Staffan Lundin

    (Department of Engineering Sciences, Uppsala University, P.O. box 534, 751 21 Uppsala, Sweden)

  • Karin Thomas

    (Department of Engineering Sciences, Uppsala University, P.O. box 534, 751 21 Uppsala, Sweden)

  • Mats Leijon

    (Department of Engineering Sciences, Uppsala University, P.O. box 534, 751 21 Uppsala, Sweden
    Engineering and the Environment, University of Southampton, Southampton SO17 1BJ, UK)

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.

Suggested Citation

  • Johan Forslund & Staffan Lundin & Karin Thomas & Mats Leijon, 2015. "Experimental Results of a DC Bus Voltage Level Control for a Load-Controlled Marine Current Energy Converter," Energies, MDPI, vol. 8(5), pages 1-15, May.
    • Handle: RePEc:gam:jeners:v:8:y:2015:i:5:p:4572-4586:d:49895
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    References listed on IDEAS

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    1. Hae Gwang Jeong & Ro Hak Seung & Kyo Beum Lee, 2012. "An Improved Maximum Power Point Tracking Method for Wind Power Systems," Energies, MDPI, vol. 5(5), pages 1-16, May.
    2. Abbes, Mohamed & Belhadj, Jamel & Ben Abdelghani Bennani, Afef, 2010. "Design and control of a direct drive wind turbine equipped with multilevel converters," Renewable Energy, Elsevier, vol. 35(5), pages 936-945.
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    Cited by:

    1. Jennifer Leijon & Johan Forslund & Karin Thomas & Cecilia Boström, 2018. "Marine Current Energy Converters to Power a Reverse Osmosis Desalination Plant," Energies, MDPI, vol. 11(11), pages 1-13, October.
    2. Wenbin Su & Hongbo Wei & Penghua Guo & Qiao Hu & Mengyuan Guo & Yuanjie Zhou & Dayu Zhang & Zhufeng Lei & Chaohui Wang, 2021. "Research on Hydraulic Conversion Technology of Small Ocean Current Turbines for Low-Flow Current Energy Generation," Energies, MDPI, vol. 14(20), pages 1-19, October.
    3. Johan Forslund & Anders Goude & Karin Thomas, 2018. "Validation of a Coupled Electrical and Hydrodynamic Simulation Model for a Vertical Axis Marine Current Energy Converter," Energies, MDPI, vol. 11(11), pages 1-13, November.

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