IEC 61400-3-2-ed.1.0

Detail information

Designation: IEC 61400-3-2-ed.1.0

Publication date: 22/01/2025

Pages: 0

Country: International technical standard

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Anotation

IEC 61400-3-2:2025 specifies requirements for assessment of the external conditions at a floating offshore wind turbine (FOWT) site and specifies essential design requirements to ensure the engineering integrity of FOWTs. Its purpose is to provide an appropriate level of protection against damage from all anticipated hazards during the planned lifetime. This document focuses on the engineering integrity of the structural components of a FOWT but is also concerned with subsystems such as control and protection mechanisms, internal electrical systems and mechanical systems. This first edition cancels and replaces IEC TS 61400-3-2, published in 2019. This edition includes the following significant technical changes with respect to IEC TS 61400-3-2: a) The relevant contents of IEC 61400-3-1 have been migrated into IEC 61400-3-2, making IEC 61400-3-2 a self-standing document that does not have to be read directly in conjunction with IEC 61400-3-1. b) Several modifications have been made regarding metocean conditions in Clause 6 considering the nature of FOWT and the offshore site where FOWT will be installed, including: (1) the importance of wave directional spreading has been highlighted as it may result in larger loads for FOWT, including the addition of the new informative Annex O and Annex P and (2) the characteristic of swell has been explained, which may be relevant for some FOWT projects, including the addition of new informative Annex R regarding the characteristic of swell. c) Subclauses 7.1, 7.2, 7.3, 7.4 and 7.5 have been changed to include a revised DLC table and its related descriptions, including amongst others updated requirements on directionality, wave conditions, redundancy check and damage stability cases, and a robustness check case; further updates are made related to guidance and necessities provided on load calculations and simulation requirements. d) Subclause 7.6 has been updated with guidance on fatigue assessment along with clarifications on serviceability analysis and the applicable material for WSD; related Annex L has been updated and a new Annex M has been added for clarification of the safety factors and load and load effect approach for floating substructures e) The concept of floater control system that will interact with the wind turbine controller has been introduced in Clause 8. f) Clause 11 has been renamed from "Foundation and substructure design" to "Anchor design" and requirements for the transient conditions have been added. g) A more detailed clause regarding concrete design has been added to Clause 16 together with an informative Annex Q. h) Clause 15 has been updated with the aim to improve ease of use, using experience from oil and gas and considering unique wind turbine characteristics; updates included guidance for TLPs, damage stability, dynamic stability, testing and the addition for Annex S regarding how to analyse collision probability. lIEC 61400-3-2:2025 specifie des exigences devaluation des conditions externes sur un site deoliennes en mer flottantes (FOWT), ainsi que les exigences essentielles de conception, afin dassurer lintegrite technique des FOWT. Elle a pour objet de fournir un niveau de protection approprie contre les dommages provoques par tous les dangers prevus pendant la duree de vie prevue. Le present document se concentre sur lintegrite technique des composants structurels dune FOWT, mais concerne egalement les sous-systemes, tels que les mecanismes de commande et de protection, les systemes electriques internes et les systemes mecaniques. Cette premiere edition annule et remplace lIEC TS 61400-3-2 parue en 2019. Cette premiere edition annule et remplace lIEC TS 61400-3-2 parue en 2019. a) le contenu pertinent de lIEC 61400-3-1 a ete transfere dans lIEC 61400-3-2, faisant de lIEC 61400-3-2 un document autonome qui ne doit pas etre lu directement conjointement avec lIEC 61400-3-1; b) plusieurs modifications ont ete apportees concernant les conditions oceano-meteorologiques specifiees a lArticle 6 en prenant en compte la nature de la FOWT et le site en mer sur lequel la FOWT est installee, notamment: (1) limportance de la propagation directionnelle des vagues a ete soulignee, car elle peut entrainer des charges plus importantes pour la FOWT, y compris lajout des nouvelles Annexe O et Annexe P informatives, et (2) la caracteristique de la houle a ete expliquee, ce qui peut etre pertinent pour certains projets FOWT, y compris lajout dune nouvelle Annexe R informative concernant la caracteristique de la houle; c) les 7.1, 7.2, 7.3, 7.4 et 7.5 ont ete modifies pour inclure un tableau de DLC (Design Load Case, cas de charge pour la conception) revise et ses descriptions associees, y compris, entre autres, des exigences mises a jour sur la directionnalite, les conditions de vagues, les cas de controle de redondance et de stabilite apres avarie, et un cas de controle de solidite; dautres mises a jour sont effectuees concernant les recommandations et les elements necessaires fournis sur les calculs de charge et les exigences de simulation; d) le 7.6 a ete mis a jour avec des recommandations relatives a levaluation de la fatigue ainsi que des clarifications sur lanalyse de laptitude au service et le materiel applicable pour le WSD. LAnnexe L connexe a ete mise a jour et une nouvelle Annexe M a ete ajoutee pour la clarification des facteurs de securite et lapproche de charge et deffet de charge pour les sous-structures flottantes; e) le concept de systeme de commande de flotteur qui interagit avec le regulateur de leolienne a ete introduit a lArticle 8; f) lArticle 11 "Conception de la fondation et de la sous-structure" a ete renomme en "Conception des ancres" et des exigences relatives aux conditions transitoires ont ete ajoutees; g) un article plus detaille sur la conception du beton a ete ajoute a lArticle 16 ainsi quune Annexe Q informative; h) lArticle 15 a ete mis a jour dans le but dameliorer la f