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Analysis of a horizontal-axis tidal turbine performance in the presence of regular and irregular waves using two control strategies

Ordonez-Sanchez, Stephanie, Allmark, Matthew ORCID:, Porter, Kate, Ellis, Robert, Lloyd, Catherine ORCID:, Santic, Ivan, O'Doherty, Tim ORCID: and Johnstone, Cameron 2019. Analysis of a horizontal-axis tidal turbine performance in the presence of regular and irregular waves using two control strategies. Energies 12 (3) , -. 10.3390/en12030367

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The flow developed on a tidal site can be characterized by combinations of turbulence, shear flows, and waves. Horizontal-axis tidal turbines are therefore subjected to dynamic loadings that may compromise the working life of the rotor and drive train components. To this end, a series of experiments were carried out using a 0.9 m horizontal-axis tidal turbine in a tow tank facility. The experiments included two types of regular waveforms, one of them simulating an extreme wave case, the other simulating a more moderate wave case. The second regular wave was designed to match the peak period and significant wave height of an irregular wave which was also tested. Measurements of torque, thrust, and blade-bending moments were taken during the testing campaign. Speed and torque control strategies were implemented for a range of operational points to investigate the influence that a control mode had in the performance of a tidal stream turbine. The results showed similar average power and thrust values were not affected by the control strategy, nor the influence of either the regular or irregular wave cases. However, it was observed that using torque control resulted in an increase of thrust and blade root bending moment fluctuations per wave period. The increase in fluctuations was in the order of 40% when compared to the speed control cases.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Advanced Research Computing @ Cardiff (ARCCA)
Publisher: MDPI
ISSN: 1996-1073
Date of First Compliant Deposit: 14 February 2019
Date of Acceptance: 21 January 2019
Last Modified: 07 Feb 2023 02:52

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