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Your search keyword '"Energia eòlica -- Estructures marines"' showing total 2 results
Start Over Descriptor "Energia eòlica -- Estructures marines" Topic 0202 electrical engineering, electronic engineering, information engineering
2 results on '"Energia eòlica -- Estructures marines"'

1. The influence of different wind and wave conditions on the energy yield and downtime of a Spar-buoy floating wind turbine

Author

Climent Molins, Mikel De-Prada-Gil, Markus Lerch, Institut de Recerca en Energía de Catalunya, Universitat Politècnica de Catalunya. Departament d'Enginyeria Civil i Ambiental, and Universitat Politècnica de Catalunya. ATEM - Anàlisi i Tecnologia d'Estructures i Materials

Subjects
Downtime, 060102 archaeology, Energia eòlica -- Estructures marines, Renewable Energy, Sustainability and the Environment, 020209 energy, Floating wind turbine, 06 humanities and the arts, 02 engineering and technology, Molins de vent, 7. Clean energy, Turbine, Offshore wind power, Acceleration, Electricity generation, 13. Climate action, Spar buoy, Wind turbines, 0202 electrical engineering, electronic engineering, information engineering, Environmental science, 0601 history and archaeology, Submarine pipeline, Energies::Energia eòlica::Aerogeneradors [Àrees temàtiques de la UPC], Floating offshore wind turbine Energy yield Downtime Dynamic model Met-ocean conditions, Offshore structures, Marine engineering
Abstract

Floating offshore wind turbines (FOWT) have been extensively proven in model tests and are reaching currently a pre-commercial phase where large scale demonstrators are being built offshore. This transition increases the need for models able to assess the performance at suitable offshore locations. A simplified model is proposed that computes the dynamic response of FOWT to different met-ocean conditions and calculates the energy production considering the behavior of the structure as well as the downtime of the turbine due to exceeding operating limits. The model is validated against FAST and applied to three offshore sites. The motions response and hub acceleration are largest for West of Barra followed by Gulf of Maine and Costa Brava. The energy generation is also the highest at West of Barra, where a capacity factor of 75% is reached. A comparison between the energy generation of a bottom-fixed and FOWT indicates a difference of less than 1% for all sites. Finally, a sensitivity analysis of hub acceleration and platform pitch limits studies the impact on the capacity factor and downtime. The model can be useful for feasibility or pre-engineering studies and can be of interest for both investigators and developers of offshore wind projects.

2. DC voltage droop control design for multiterminal HVDC systems considering AC and DC grid dynamics

Author

Agusti Egea-Alvarez, Oriol Gomis-Bellmunt, Sajjad Fekriasl, Eduardo Prieto-Araujo, Universitat Politècnica de Catalunya. Departament d'Enginyeria Elèctrica, and Universitat Politècnica de Catalunya. CITCEA - Centre d'Innovació Tecnològica en Convertidors Estàtics i Accionaments

Subjects
droop control, offshore wind power, Computer science, 020209 energy, Energy Engineering and Power Technology, 02 engineering and technology, Hardware_PERFORMANCEANDRELIABILITY, law.invention, Control theory, law, 0202 electrical engineering, electronic engineering, information engineering, Electronic engineering, Parcs eòlics marins, Voltage droop, Electrical and Electronic Engineering, AC and dc grid interactions, Frequency analysis, HVDC, Energia eòlica -- Estructures marines, Oscillation, Multivariable calculus, Linear model, Wind power plants, multiterminal, Grid, System dynamics, Phase-locked loop, Energies::Energia eòlica [Àrees temàtiques de la UPC]
Abstract

This paper focuses on the droop-based dc voltage control design for multiterminal VSC-HVDC grid systems, considering the ac and the dc system dynamics. The droop control design relies on detailed linearized models of the complete multiterminal grid, including the different system dynamics, such as the dc grid, the ac grid, the ac connection filters, and the converter inner controllers. Based on the derived linear models, classical and modern control techniques are applied to design the different controllers, including a multivariable frequency analysis to design the grid voltage droop control. In combination with the droop control, a dc oscillation damping scheme is proposed in order to improve system performance. The control design is validated through simulations of a three-terminal system.

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