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James Kelly
MaREI Centre, Beaufort building, University College Cork, Haubowline Road, P43C573 Ringaskiddy, Co. Cork, Ireland

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Journal article
Published: 18 October 2019 in Energies
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The Tupperwave device is a closed-circuit oscillating water column (OWC) wave energy converter that uses non-return valves and two large fixed-volume accumulator chambers to create a smooth unidirectional air flow, harnessed by a unidirectional turbine. In this paper, the relevance of the Tupperwave concept against the conventional OWC concept, that uses a self-rectifying turbine, is investigated. For this purpose, wave-to-wire numerical models of the Tupperwave device and a corresponding conventional OWC device are developed and validated against experimental tests. Both devices have the same floating spar buoy structure and a similar turbine technology. The models include wave-structure hydrodynamic interaction, air turbines and generators, along with their control laws in order to encompass all power conversion stages from wave to electrical power. Hardware-in-the-loop is used to physically emulate the last power conversion stage from mechanic to electrical power and hence validate the control law and the generator numerical model. The dimensioning methodology for turbines and generators for power optimisation is explained. Eventually, the validated wave-to-wire numerical models of the conventional OWC and the Tupperwave device are used to assess and compare the performances of these two OWC type wave energy device concepts in the same wave climate. The benefits of pneumatic power smoothing by the Tupperwave device are discussed and the required efficiency of the non-return valves is investigated.

ACS Style

Pierre Benreguig; James Kelly; Vikram Pakrashi; Jimmy Murphy. Wave-to-Wire Model Development and Validation for Two OWC Type Wave Energy Converters. Energies 2019, 12, 3977 .

AMA Style

Pierre Benreguig, James Kelly, Vikram Pakrashi, Jimmy Murphy. Wave-to-Wire Model Development and Validation for Two OWC Type Wave Energy Converters. Energies. 2019; 12 (20):3977.

Chicago/Turabian Style

Pierre Benreguig; James Kelly; Vikram Pakrashi; Jimmy Murphy. 2019. "Wave-to-Wire Model Development and Validation for Two OWC Type Wave Energy Converters." Energies 12, no. 20: 3977.

Journal article
Published: 24 September 2019 in Energies
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The push for carbon-free energy sources has helped encourage the development of the ocean renewable energy sector. As ocean renewable energy approaches commercial maturity, the industry must be able to prove it can provide clean electrical power of good quality for consumers. As part of the EU funded Open Sea Operating Experience to Reduce Wave Energy Cost (OPERA) project that is tasked with developing the wave energy sector, the International Electrotechnical Commission (IEC) developed electrical power quality standards for marine energy converters, which were applied to an oscillating water column (OWC). This was done both in the laboratory and in the real world. Precise electrical monitoring equipment was installed in the Mutriku Wave Power Plant in Spain and to an OWC emulator in the Lir National Ocean Test Facility at University College Cork in Ireland to monitor the electrical power of both. The electrical power generated was analysed for harmonic current distortion and the results were compared. The observations from sea trials and laboratory trials demonstrate that laboratory emulators can be used in early stage development to identify the harmonic characteristics of a wave energy converter.

ACS Style

James Kelly; Endika Aldaiturriaga; Pablo Ruiz-Minguela. Applying International Power Quality Standards for Current Harmonic Distortion to Wave Energy Converters and Verified Device Emulators. Energies 2019, 12, 3654 .

AMA Style

James Kelly, Endika Aldaiturriaga, Pablo Ruiz-Minguela. Applying International Power Quality Standards for Current Harmonic Distortion to Wave Energy Converters and Verified Device Emulators. Energies. 2019; 12 (19):3654.

Chicago/Turabian Style

James Kelly; Endika Aldaiturriaga; Pablo Ruiz-Minguela. 2019. "Applying International Power Quality Standards for Current Harmonic Distortion to Wave Energy Converters and Verified Device Emulators." Energies 12, no. 19: 3654.

Journal article
Published: 26 August 2019 in Renewable Energy
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To be competitive against other renewable energy sources, energy converted from the ocean waves needs to reduce its associated levelised cost of energy. It has been proven that advanced control algorithms can increase power production and device reliability. They act throughout the power conversion chain, from the hydrodynamics of wave absorption to the power take-off to improve the energy yield. The present work highlights the development and test of several algorithms to control the biradial turbine which is to be installed in the Mutriku oscillating water column plant. A collection of adaptive and predictive controllers is explored and both turbine speed controllers and latching strategies are examined. A Wave-to-Wire model of one chamber of the plant is detailed and simulation results of six control laws are obtained. The controllers are then validated using an electrical test infrastructure to prepare the future deployment in the plant. Finally, the control strategies are assessed against criteria like energy production, power quality or reliability.

ACS Style

François-Xavier Faÿ; João C. Henriques; James Kelly; Markus Mueller; Moahammad Abusara; Wanan Sheng; Marga Marcos. Comparative assessment of control strategies for the biradial turbine in the Mutriku OWC plant. Renewable Energy 2019, 146, 2766 -2784.

AMA Style

François-Xavier Faÿ, João C. Henriques, James Kelly, Markus Mueller, Moahammad Abusara, Wanan Sheng, Marga Marcos. Comparative assessment of control strategies for the biradial turbine in the Mutriku OWC plant. Renewable Energy. 2019; 146 ():2766-2784.

Chicago/Turabian Style

François-Xavier Faÿ; João C. Henriques; James Kelly; Markus Mueller; Moahammad Abusara; Wanan Sheng; Marga Marcos. 2019. "Comparative assessment of control strategies for the biradial turbine in the Mutriku OWC plant." Renewable Energy 146, no. : 2766-2784.