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

    Penalba, Markel and Cortajarena, José-Antonio and Ringwood, John (2017) Validating a Wave-to-Wire Model for a Wave Energy Converter—Part II: The Electrical System. Energies, 10 (7). pp. 1002-1025. ISSN 1996-1073

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    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.

    Item Type: Article
    Additional Information: ©2017 by the authors; licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license ( This material is based on works supported by the Science Foundation Ireland under Grant No. 13/IA/1886.
    Keywords: wave-to-wire modelling; experimental testing; validation; electric generator; back-to-back power converters; grid;
    Academic Unit: Faculty of Science and Engineering > Electronic Engineering
    Faculty of Science and Engineering > Research Institutes > Centre for Ocean Energy Research
    Item ID: 9431
    Identification Number:
    Depositing User: Professor John Ringwood
    Date Deposited: 30 Apr 2018 14:56
    Journal or Publication Title: Energies
    Publisher: MDPI AG
    Refereed: Yes
    Use Licence: This item is available under a Creative Commons Attribution Non Commercial Share Alike Licence (CC BY-NC-SA). Details of this licence are available here

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