FprEN IEC 61400-3-2:2024

Wind energy generation systems - Part 3-2: Design requirements for floating offshore wind turbines

Windenergieanlagen - Teil 3-2: Auslegungsanforderungen für schwimmende Windenergieanlagen auf offener See

Systèmes de génération d’énergie éolienne - Partie 3-2: Exigences de conception des éoliennes en mer flottantes

Sistemi za proizvodnjo energije na veter - 3-2. del: Izvedbene zahteve za plavajoče vetrne turbine

General Information

• Status: Not Published
• Publication Date: 27-Oct-2024
• ICS: 27.180 - Wind turbine energy systems
• Technical Committee: CLC/TC 88 - Wind turbines
• Drafting Committee: IEC/TC 88 - IEC_TC_88
• Current Stage: 5020 - Vote circulated - Formal Approval
• Start Date: 14-Jun-2024
• Due Date: 30-Sep-2022
• Completion Date: 14-Jun-2024
• Ref Project: kSIST FprEN IEC 61400-3-2:2024 - Wind energy generation systems - Part 3-2: Design requirements for floating offshore wind turbines

Standards Content (Sample)

SLOVENSKI STANDARD
oSIST prEN IEC 61400-3-2:2023
01-februar-2022
Sistemi za proizvodnjo energije na veter - 3-2. del: Izvedbene zahteve za plavajoče
vetrne turbine
Wind energy generation systems - Part 3-2: Design requirements for floating offshore
wind turbines
Ta slovenski standard je istoveten z: prEN IEC 61400-3-2:2022
ICS:
27.180 Vetrne elektrarne Wind turbine energy systems
oSIST prEN IEC 61400-3-2:2023 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

oSIST prEN IEC 61400-3-2:2023
oSIST prEN IEC 61400-3-2:2023
88/917/CDV
COMMITTEE DRAFT FOR VOTE (CDV)
PROJECT NUMBER:
IEC 61400-3-2 ED1
DATE OF CIRCULATION: CLOSING DATE FOR VOTING:
2022-12-09 2023-03-03
SUPERSEDES DOCUMENTS:
88/846/CD, 88/915/CC
IEC TC 88 : WIND ENERGY GENERATION SYSTEMS
SECRETARIAT: SECRETARY:
Denmark Mrs Christine Weibøl Bertelsen
OF INTEREST TO THE FOLLOWING COMMITTEES: PROPOSED HORIZONTAL STANDARD:
TC 114
Other TC/SCs are requested to indicate their interest, if any, in
this CDV to the secretary.
FUNCTIONS CONCERNED:
EMC ENVIRONMENT QUALITY ASSURANCE SAFETY
SUBMITTED FOR CENELEC PARALLEL VOTING NOT SUBMITTED FOR CENELEC PARALLEL VOTING
Attention IEC-CENELEC parallel voting
The attention of IEC National Committees, members of
CENELEC, is drawn to the fact that this Committee Draft for Vote
(CDV) is submitted for parallel voting.
The CENELEC members are invited to vote through the
CENELEC online voting system.
This document is still under study and subject to change. It should not be used for reference purposes.
Recipients of this document are invited to submit, with their comments, notification of any relevant patent rights of which they are
aware and to provide supporting documentation.
TITLE:
Wind energy generation systems – Part 3-2: Design requirements for floating offshore wind turbines
PROPOSED STABILITY DATE: 2026
NOTE FROM TC/SC OFFICERS:
In order to assist MT 3-2 when sorting and compiling the given comments on the CDV document, it is of great importance
that all comments given in the comments form refer to both clause and line numbers in the CDV document.
electronic file, to make a copy and to print out the content for the sole purpose of preparing National Committee positions.
You may not copy or "mirror" the file or printed version of the document, or any part of it, for any other purpose without
permission in writing from IEC.

oSIST prEN IEC 61400-3-2:2023
88/917/CDV − 2 − IEC CDV 61400-3-2 © IEC 2022
CONTENTS
CONTENTS . 1
FOREWORD . 8
INTRODUCTION . 11
1 Scope . 12
2 Normative references . 13
3 Terms and definitions . 14
4 Symbols and abbreviated terms . 25
4.1 Symbols and units. 25
4.2 Abbreviations . 26
5 Principal elements . 27
5.1 General . 27
5.2 Design methods . 28
5.3 Exposure level for FOWT . 29
5.4 Safety classes for RNA and tower . 29
5.5 Quality assurance . 30
5.6 Rotor–nacelle assembly markings . 30
5.7 Support structure markings . 30
6 External conditions – definition and assessment . 30
6.1 General . 30
6.2 Wind turbine classes . 31
6.3 Definition of external conditions at a FOWT site . 31
6.3.1 General . 31
6.3.2 Wind conditions . 32
6.3.3 Marine conditions . 32
6.3.4 Electrical power network conditions . 40
6.3.5 Other environmental conditions . 40
6.4 Assessment of external conditions at a FOWT site . 41
6.4.1 General . 41
6.4.2 The metocean database . 41
6.4.3 Assessment of wind conditions . 42
6.4.4 Assessment of marine conditions . 44
6.4.5 Assessment of other environmental conditions . 48
6.4.6 Assessment of electrical network conditions . 49
6.4.7 Assessment of soil conditions . 49
7 Structural design . 50
7.1 General . 50
7.2 Design methodology . 51
7.3 Loads. 51
7.3.1 General . 51
7.3.2 Gravitational and inertial loads . 51
7.3.3 Aerodynamic loads . 51
7.3.4 Actuation loads . 51
7.3.5 Hydrodynamic loads . 52

oSIST prEN IEC 61400-3-2:2023
IEC CDV 61400-3-2 © IEC 2022 − 3 − 88/917/CDV
7.3.6 Sea/lake ice loads . 52
7.3.7 Other loads . 53
7.4 Design situations and load cases . 53
7.4.1 General . 53
7.4.2 Power production (DLC 1.1 to 1.6) . 62
7.4.3 Power production plus occurrence of fault or loss of electrical network
connection (DLC 2.1 – 2.6) . 64
7.4.4 Start up (DLC 3.1 to 3.3). 66
7.4.5 Normal shutdown (DLC 4.1 to 4.3) . 67
7.4.6 Emergency stop (DLC 5.1) . 67
7.4.7 Parked (standstill or idling) (DLC 6.1 to 6.5) . 67
7.4.8 Parked plus fault conditions (DLC 7.1 to 7.2) . 69
7.4.9 Transport, assembly, maintenance and repair (DLC 8.1 to 8.4) . 70
7.4.10 Redundancy check and damage stability (DLC F1.1 to F2.3) . 73
7.5 Load and load effect calculations . 74
7.5.1 General . 74
7.5.2 Relevance of hydrodynamic loads . 75
7.5.3 Calculation of hydrodynamic loads . 75
7.5.4 Calculation of sea/lake ice loads . 76
7.5.5 Overall damping assessment for support structure response evaluations . 76
7.5.6 Simulation requirements . 77
7.5.7 Other requirements . 80
7.6 Ultimate limit state analysis. 81
7.6.1 Method . 81
7.6.2 Ultimate strength analysis . 84
7.6.3 Fatigue analysis . 85
7.6.4 Special partial safety factors . 86
7.6.5 Working stress design method . 86
7.6.6 Serviceability analysis . 87
8 Control system . 87
9 Mechanical systems . 88
10 Electrical system . 89
11 Anchor design . 90
12 Assembly, transport and installation . 90
12.1 General . 90
12.2 Planning . 90
12.3 Environmental conditions . 91
12.4 Documentation . 91
12.5 Transport, receiving, handling and storage . 91
13 Commissioning, operation and maintenance . 91
13.1 General . 91
13.2 Design requirements for safe operation, inspection and maintenance . 91
13.3 Commissioning . 92
13.3.1 General . 93
13.3.2 Energization . 93
13.3.3 Commissioning tests . 93

oSIST prEN IEC 61400-3-2:2023
88/917/CDV − 4 − IEC CDV 61400-3-2 © IEC 2022
13.3.4 Records . 93
13.3.5 Post commissioning activities . 93
13.4 Operator’s instruction manual . 93
13.4.1 General . 93
13.4.2 Instructions for operations and maintenance record . 94
13.4.3 Instructions for unscheduled automatic shutdown . 94
13.4.4 Instructions for diminished reliability . 94
13.4.5 Work procedures plan . 94
13.4.6 Emergency procedures plan . 95
13.5 Maintenance manual . 95
14 Stationkeeping systems . 96
14.1 General .
...