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Energies 2017, 10(7), 1002; https://doi.org/10.3390/en10071002

Validating a Wave-to-Wire Model for a Wave Energy Converter—Part II: The Electrical System

1
Centre for Ocean Energy Research, Maynooth University, Maynooth, Ireland
2
Engineering School of Eibar, University of the Basque Country, 20600 Eibar, Spain
*
Author to whom correspondence should be addressed.
Received: 24 May 2017 / Revised: 3 July 2017 / Accepted: 3 July 2017 / Published: 14 July 2017
(This article belongs to the Special Issue Marine Energy)
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Abstract

The incorporation of the full dynamics of the different conversion stages of wave energy converters (WECs), from ocean waves to the electricity grid, is essential for a realistic evaluation of the power flow in the drive train. WECs with different power take-off (PTO) systems, including diverse transmission mechanisms, have been developed in recent decades. However, all the different PTO systems for electricity-producing WECs, regardless of any intermediate transmission mechanism, include an electric generator, linear or rotational. Therefore, accurately modelling the dynamics of electric generators is crucial for all wave-to-wire (W2W) models. This paper presents the models for three popular rotational electric generators (squirrel cage induction machine, permanent magnet synchronous generator and doubly-fed induction generator) and a back-to-back (B2B) power converter and validates such models against experimental data generated using three real electric machines. The input signals for the validation of the mathematical models are designed so that the whole operation range of the electrical generators is covered, including input signals generated using the W2W model that mimic the behaviour of different hydraulic PTO systems. Results demonstrate the effectiveness of the models in accurately reproducing the characteristics of the three electrical machines, including power losses in the different machines and the B2B converter. View Full-Text
Keywords: wave-to-wire modelling; experimental testing; validation; electric generator; back-to-back power converters; grid wave-to-wire modelling; experimental testing; validation; electric generator; back-to-back power converters; grid
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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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Penalba, M.; Cortajarena, J.-A.; Ringwood, J.V. Validating a Wave-to-Wire Model for a Wave Energy Converter—Part II: The Electrical System. Energies 2017, 10, 1002.

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