Browsing by Author "De Alegría, I. Martínez"
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Item Analysis of the technology currently used in Offshore Wind energy systems(2011) Madariaga, A.; De Alegría, I. Martínez; Martin, J. L.; Eguía, P.; Ceballos, S.; POWER ELECTRONICS AND SYSTEM EQUIPMENTThis paper gives an overview to the foundations, the Offshore Wind Turbines (OWTs) and the collection and transmission systems of Offshore Wind Farms (OWFs). Although for some of the components of their Electric Systems (ESs) there are different technical possibilities under consideration, under certain conditions of sea depth and distance from shore there are already tested industrial solutions available. However, the technology is not mature yet and decisions adopted today could condition the future expansion of operating OWFs or the development of the already planned Offshore Wind Power Plants (OWPPs). This paper presents the information gathered from about 93% of the currently operating OWFs. Moreover, OWPPs under construction have also been considered to confirm the conclusions presented and to detect current technological trends.Item Current facts about offshore wind farms(2012-06) Madariaga, A.; De Alegría, I. Martínez; Martín, J. L.; Eguía, P.; Ceballos, S.; POWER ELECTRONICS AND SYSTEM EQUIPMENTThis paper reviews offshore wind projects with a wide perspective. The current situation of the offshore wind market is presented, pointing out the countries leading the process in terms of installed capacity and in terms of technological leadership. Feasibility studies of alternative offshore wind farms (OWFs) are interesting not only in relation to the business but in relation to the techno-economical analyses that engineering researchers need to do. Details about the average energy yield assessment, the costs and the price for the purchased energy are commented on, as key elements of those feasibility studies. The higher cost of renewable energy sources of electricity (RESE) when compared with conventional sources, demands appropriate policy support. The European regulatory framework and the support schemes established by European Member States are presented, as well as the role that different transmission system operators (TSOs) are playing at the moment. Finally, most of the OWFs currently operating are presented, analysing the technical characteristics of their electric subsystems: the wind energy conversion systems (WECSs) transforming the kinetic energy of the wind into electricity, the collector system (CS) gathering the power output of all the turbines to a central collection point (CCP) and the transmission system (TS) taking that power to the onshore main grid.Item High power high voltage DC/DC converter for MVDC distribution applications(2012) De Alegría, I. Martínez; Santamaria, V.; Madariaga, A.; Martín, J. L.; Ceballos, S.; POWER ELECTRONICS AND SYSTEM EQUIPMENTSmart grids and distributed power will play a big role in the future power grid. In the future many DC grids will coexist with the traditional AC grids. This paper presents an efficient and low cost alternative for unidirectional or asymmetric interconnection of DC grids using MVDC transmission lines using High Frequency Transformers.