Operation analysis of a wave energy converter under different load conditions

Operation analysis of a wave energy converter under different load conditions

For access to this article, please select a purchase option:

Buy article PDF
(plus tax if applicable)
Buy Knowledge Pack
10 articles for $120.00
(plus taxes if applicable)

IET members benefit from discounts to all IET publications and free access to E&T Magazine. If you are an IET member, log in to your account and the discounts will automatically be applied.

Learn more about IET membership 

Recommend Title Publication to library

You must fill out fields marked with: *

Librarian details
Your details
Why are you recommending this title?
Select reason:
IET Renewable Power Generation — Recommend this title to your library

Thank you

Your recommendation has been sent to your librarian.

This study analyses the electrical behaviour of a direct-driven linear generator under different load conditions. The studied generator is used in a wave energy converter (WEC) that converts the energy in ocean waves into electric energy. To enable a grid connection of a WEC, the voltage must be converted, and thereby, the generator will be subjected to a non-linear damping. Depending on how the conversion system is designed, the damping will be different. In the case studied, the voltage is first rectified, and on the dc-side of the rectifier the voltage is kept constant by controlling the power through a converter. In order to study the electrical behaviour of the generator in this operation mode, a simulation model was made in MATLAB Simulink. The model of the generator was verified with experimental data from an offshore operating WEC. The result of the study shows that the model of the generator agrees with the real generator and can be used for analysing the electrical behaviour of the WEC. Moreover, the results show that the operation with a non-linear load will be different compared to a linear load case.


    1. 1)
    2. 2)
    3. 3)
      • , : `International energy agency implementing agreement on ocean energy systems', Annual Report, 2008, IEA-OES executive committee, 2008.
    4. 4)
    5. 5)
    6. 6)
      • Division for Electricity, Uppsala University homepage, Wave power project Lysekil. Available at, accessed 10 December 2010.
    7. 7)
    8. 8)
    9. 9)
      • Mahrous, E.A., Rahim, N.A., Hew, W.P., Nor, K.M.: `Proposed nine switches five level inverter with low switching frequencies for linear generator applications', Int. Conf. Power Electronics and Drive System, PEDS2005, 2005, p. 648–653.
    10. 10)
    11. 11)
    12. 12)
    13. 13)
    14. 14)
    15. 15)
    16. 16)

Related content

This is a required field
Please enter a valid email address