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Open AccessArticle

Grid Integration and Power Smoothing of an Oscillating Water Column Wave Energy Converter

1
Australian Maritime College, University of Tasmania, Launceston, Tasmania 7250, Australia
2
Centre for Renewable Energy and Power Systems, University of Tasmania, Hobart, Tasmania 7001, Australia
*
Author to whom correspondence should be addressed.
Energies 2018, 11(7), 1871; https://doi.org/10.3390/en11071871
Received: 7 June 2018 / Revised: 26 June 2018 / Accepted: 13 July 2018 / Published: 18 July 2018
(This article belongs to the Special Issue Wave and Tidal Energy)
This paper applies model predictive control (MPC) for the power processing of an oscillating water column (OWC) wave energy conversion (WEC) system to achieve smooth power delivery to the grid. The particular air turbine design adopted in this study produces large power pulses ranging from 0 to 1 MW in magnitude, and thus, direct connection to the grid is practically impossible, especially in weak grid conditions. Therefore, energy storage is an essential element that should be integrated into this particular WEC system in order to absorb power pulses and thereby ensure smooth delivery of power to the grid. Taking into account the repetitive nature, duration, and magnitude of the power pulses, this study has chosen “supercapacitor” as the suitable energy storage technology. The supercapacitor energy storage (SCES) is integrated into the dc-link of the back-to-back power converter of the WEC system through a bidirectional dc-dc converter. In order to achieve the desired operation of this complex power converter arrangement, a finite control set MPC strategy is proposed in this paper. Performance of the proposed energy storage system (ESS) and control strategy are evaluated through computer simulations. Simulation results show that the proposed SCES system and the control strategy are able to achieve smooth power delivery to the grid amidst power pulses coming from the generator. View Full-Text
Keywords: dc-dc bidirectional converter; finite control set-model predictive control (FCS-MPC); oscillating water column (OWC); supercapacitor energy storage (SCES) dc-dc bidirectional converter; finite control set-model predictive control (FCS-MPC); oscillating water column (OWC); supercapacitor energy storage (SCES)
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Rajapakse, G.; Jayasinghe, S.; Fleming, A.; Negnevitsky, M. Grid Integration and Power Smoothing of an Oscillating Water Column Wave Energy Converter. Energies 2018, 11, 1871.

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