Browsing by Keyword "Tidal power stations and plants"
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Item Electrical generators in ocean energy converters(Institution of Engineering and Technology, 2013-01-01) O’Sullivan, D.; Bard, J.; Kracht, P.; Ceballos, S.; Robles, E.; POWER ELECTRONICS AND SYSTEM EQUIPMENT; RENOVABLES OFFSHOREThis chapter provides an outline of the issues confronting the designer of an ocean energy converter (OEC) when selecting or designing the electrical generator and its associated control system. It is clear that, especially for wave energy converters (WECs), this is a complex problem due to the high variance in device power take-off (PTO) type, and indeed the functionality of the generator itself within the power chain. Specification and design of the generator system in tidal energy converters (TECs) have been reviewed and shown to be highly dependent on the device, turbine and current characteristics. Both squirrel cage induction generators (SCIGs) and permanent magnet synchronous generators (PMSGs) are promising generator technologies for application in TECs, showing individual advantages and disadvantages. As important as the choice of the generator technology are the concepts to deal with the special requirements of TEC devices like marine environment, submerged operation and extended maintenance intervals. A consistent requirement in both WEC and TEC system generators is the need for variable speed control and operation. In this context, the power converter technology and controller algorithms related to this need have been introduced.Item Grid integration: Part III - Case studies(Institution of Engineering and Technology, 2013-01-01) MacEnri, J.; Santos-Mugica, M.; Blavette, A.; Kavanagh, D.; Keane, A.; Flynn, D.; POWER SYSTEMSThis chapter details four case studies addressing the grid integration of wave and tidal current energy. The first three studies focus on the power quality issues arising from the connection of a tidal device or of a wave farm on their local network. More specifically, the first study investigates the impact of the SeaGen tidal turbine connected at Strangford Lough, Northern Ireland. The two other studies focus on the grid impact of a medium-size wave farm on its local network. The last study addresses the challenges in terms of grid integration at a power system level and details the capacity value of wave energy in Ireland.Item Installation, operation and maintenance of offshore renewables(Institution of Engineering and Technology, 2019-01-01) Nava, Vincenzo; Ruiz-Minguela, Pablo; Pérez-Morán, Germán; Rodríguez-Arias, Raúl; Lopez-Mendia, Joseba; Villate-Martínez, José Luis; RENOVABLES OFFSHORE; Tecnalia Research & Innovation; GENERALThe chapter deals with the basic concepts of installation, operation and maintenance of offshore renewable energy systems. Whilst focus is given to the offshore wind industry, the extension to ocean energy (wave and tidal) offers a wider perspective on the major issues concerning the installation and maintenance. A reliability-based approach has been adopted for the analysis of the failures, providing an overview about the most common functional decomposition methodologies as well as logistic requirements for the different operations at the various stages of the lifetime of an offshore renewable project. The economic modelling of the operations, based on strategies for their planning, briefly completes the chapter.Item Modelling and simulation techniques(Institution of Engineering and Technology, 2013-01-01) Benelghali, S.; Charpentier, J.; Benbouzid, M.; Santos-Mugica, M.; Mendia, J.; Fernandez, F.; Mollaghan, D.; POWER SYSTEMS; RENOVABLES OFFSHORETidal turbine dynamic performance analysis requires the use of computational models representing the nonlinear differential-algebraic equations of the various system components such as tidal resource, turbine, generator, converter, control system and grid connection. However, the main difficulty is to include a variety of sub-models with different timescales for hydrodynamic loads. The user is therefore concerned with selecting the appropriate models for the problem at hand and determining the data to represent the specific turbine equipment.