Browsing by Author "Sheng, Wanan"
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Item Comparative assessment of control strategies for the biradial turbine in the Mutriku OWC plant(2020-02) Faÿ, François-Xavier; Henriques, João C.; Kelly, James; Mueller, Markus; Abusara, Moahammad; Sheng, Wanan; Marcos, Marga; Tecnalia Research & Innovation; RENOVABLES EFICIENCIA ENERGETICA Y CIRCULARIDADTo 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.Item Ocean Energy Systems Wave Energy Modelling Task: Modelling, Verification and Validation of Wave Energy Converters: Modelling, verification and validation ofwave energy converters(2019) Wendt, Fabian; Nielsen, Kim; Yu, Yi-Hsiang; Bingham, Harry; Eskilsson, Claes; Kramer, Morten; Babarit, Aurelien; Bunnik, Tim; Costello, Ronan; Crowley, Sarah; Gendron, Bengamin; Giorgi, Giuseppe; Girardin, Samuel; Greaves, Devorah; Heras, Pilar; Hoffman, Johan; Islam, Hafizul; Jakobsen, Ken-Robert; Janson, Carl-Erik; Jansson, Johan; Kim, Hyun Yul; Kurniawan, Adi; Leoni, Massimiliano; Mathai, Thomas; Nam, Bo-Woo; Park, Sewan; Rajagopalan, Krishnakumar; Ransley, Edward; Read, Robert; Ringwood, John V.; Rodrigues, Jose Miguel; Rosenthal, Benjamin; Roy, Andre; Ruehl, Kelley; Schofield, Paul; Sheng, Wanan; Shiri, Abolfazl; Thomas, Sarah; Touzon, Imanol; Yasutaka, Imai; Giorgi, Simone; Kim, Jeong-Seok; Kim, Kyong-Hwan; Gendron, Benjamin; Greaves, Deborah; Schofield, Paul; Tecnalia Research & InnovationThe International Energy Agency Technology Collaboration Programme for Ocean Energy Systems (OES) initiated the OES Wave Energy Conversion Modelling Task, which focused on the verification and validation of numerical models for simulating wave energy converters (WECs). The long-term goal is to assess the accuracy of and establish confidence in the use of numerical models used in design as well as power performance assessment of WECs. To establish this confidence, the authors used different existing computational modelling tools to simulate given tasks to identify uncertainties related to simulation methodologies: (i) linear potential flow methods; (ii) weakly nonlinear Froude–Krylov methods; and (iii) fully nonlinear methods (fully nonlinear potential flow and Navier–Stokes models). This article summarizes the code-to-code task and code-to-experiment task that have been performed so far in this project, with a focus on investigating the impact of different levels of nonlinearities in the numerical models. Two different WECs were studied and simulated. The first was a heaving semi-submerged sphere, where free-decay tests and both regular and irregular wave cases were investigated in a code-to-code comparison. The second case was a heaving float corresponding to a physical model tested in a wave tank. We considered radiation, diffraction, and regular wave cases and compared quantities, such as the WEC motion, power output and hydrodynamic loading.