PREFACE

This Special Issue presents selected papers from EERA DeepWind‘2020, 15-17 January, Trondheim, Norway. This was the 17th Deep Sea Offshore Wind R&D Conference. The conference is hosted by SINTEF and NTNU and organized in cooperation with the European Energy Research Alliance (EERA) joint programme on wind energy. A total of 32 papers are included addressing the research topics of the conference ▪ New turbine and generator technology ▪ Grid connection and power system integration ▪ Met-ocean condition ▪ Operation and maintenant ▪ Installation and sub-structures ▪ Wind farm optimization ▪ Experimental testing and validation ▪ Wind farm control systems All papers presented in this special issue have gone through a careful peer-review organized by the international Scientific Committee of EERA DeepWind‘2020: Anaya-Lara, Olimpo, Strathclyde University Badger, Jake, DTU Berkhout, Volker, Fraunhofer IWES Berge, Erik, MET Bredmose, Henrik, DTU Cutululis, Nicolaos, DTU Eecen, Peter, ECN Heggelund, Yngve, CMR Kitzing, Lena, DTU Kvamsdal, Trond, NTNU Madsen, Peter Hauge, DTU McKeever, Paul, ORE Catapult Merz, Karl, SINTEF Energi Munduate, Xabier, CENER Muskulus, Michael, NTNU Nielsen, Finn Gunnar, UiB Nygaard, Tor Anders, IFE Reuder, Joachim, UiB Robertson, Amy, NREL Sperstad, Iver Bakken, SINTEF Energi Tande, John Olav, SINTEF Energi Uhlen, Kjetil, NTNU Van Bussel, Gerard, TU Delft Van Wingerde, Arno, Fraunhofer rWES Økland, Ole David, SINTEF Acknowledgements The financial support from the Research Council of Norway covering a share of the cost of organizing the conference is greatly appreciated. The conference chairs and guest editors of this Special Issue like to express our sincere gratitude to the Scientific Committee of EERA DeepWind‘2020, all authors that have contributed to this Special Issue, and to colleagues that have so kindly contributed to the review process. We hope that this Special Issue provides results that contribute to the fruitful development of offshore wind energy. Details of the DeepWind2020 conference and all conference presentations and posters are available at the conference web page. Conference chairs and guest editors : John Olav Giæver Tande, Chief Scientist, SINTEF Energi Trond Kvamsdal, Professor, NTNU Michael Muskulus, Professor, NTNU