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IEC TS 61400-3-2
Edition 1.0 2019-04
TECHNICAL
SPECIFICATION
colour
inside
Wind energy generation systems –
Part 3-2: Design requirements for floating offshore wind turbines
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IEC TS 61400-3-2
Edition 1.0 2019-04
TECHNICAL
SPECIFICATION
colour
inside
Wind energy generation systems –
Part 3-2: Design requirements for floating offshore wind turbines
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 27.180 ISBN 978-2-8322-5986-3
– 2 – IEC TS 61400-3-2:2019 © IEC 2019
CONTENTS
FOREWORD . 5
INTRODUCTION . 7
1 Scope . 8
2 Normative references . 8
3 Terms and definitions . 9
4 Symbols and abbreviated terms . 12
4.1 Symbols and units. 12
4.2 Abbreviations . 12
5 Principal elements . 12
5.2 Design methods . 12
5.6 Support structure markings . 14
6 External conditions – definition and assessment . 14
6.1 General . 14
6.1.2 Wind conditions . 14
6.3.3 Marine conditions . 14
6.3.5 Other environmental conditions . 15
7 Structural design . 15
7.1 General . 15
7.3 Loads. 15
7.3.2 Gravitational and inertial loads . 15
7.3.3 Aerodynamic loads . 15
7.3.5 Hydrodynamic loads . 15
7.3.6 Sea/lake ice loads . 15
7.3.7 Other loads . 16
7.4 Design situations and load cases . 16
7.5 Load and load effect calculations . 18
7.5.1 General . 18
7.5.2 Relevance of hydrodynamic loads . 18
7.5.3 Calculation of hydrodynamic loads . 18
7.5.4 Calculation of sea/lake ice loads . 19
7.5.6 Simulation requirements . 19
7.5.7 Other requirements . 21
7.6 Ultimate limit state analysis. 21
7.6.1 General . 21
7.6.3 Fatigue failure . 22
7.6.6 Working stress design method . 22
7.6.7 Serviceability analysis . 23
8 Control system . 23
9 Mechanical systems . 24
10 Electrical systems . 24
11 Foundation and substructure design . 24
12 Assembly, installation and erection . 24
12.1 General . 24
12.2 General . 24
12.3 Planning . 25
12.13 Floating specific items . 25
13 Commissioning, operation and maintenance . 25
13.1 General . 25
13.3 Instructions concerning commissioning . 25
13.4 Operator’s instruction manual . 25
13.4.1 General . 25
13.4.6 Emergency procedures plan . 25
13.5 Maintenance manual . 25
14 Stationkeeping systems . 25
15 Floating stability . 26
15.1 General . 26
15.2 Intact static stability criteria . 26
15.3 Alternative intact stability criteria based on dynamic-response . 26
15.4 Damage stability criteria . 26
16 Materials . 27
17 Marine support systems . 27
17.1 General . 27
17.2 Bilge system . 27
17.3 Ballast system . 27
Annex A (informative) Key design parameters for a floating offshore wind turbine . 28
A.1 Floating offshore wind turbine identifiers . 28
A.1.1 General . 28
A.1.2 Rotor nacelle assembly (machine) parameters . 28
A.1.3 Support structure parameters . 28
A.1.4 Wind conditions (based on a 10-min reference period and including
wind farm wake effects where relevant) . 29
A.1.5 Marine conditions (based on a 3-hour reference period where relevant) . 29
A.1.6 Electrical network conditions at turbine . 30
A.2 Other environmental conditions . 30
A.3 Limiting conditions for transport, installation and maintenance . 31
Annex B (informative) Shallow water hydrodynamics and breaking waves . 32
Annex C (informative) Guidance on calculation of hydrodynamic loads . 33
Annex D (informative) Recommendations for design of floating offshore wind turbine
support structures with respect to ice loads . 34
Annex E (informative) Floating offshore wind turbine foundation and substructure
design . 35
Annex F (informative) Statistical extrapolation of operational metocean parameters
for ultimate strength analysis . 36
Annex G (informative) Corrosion protection . 37
Annex H (informative) Prediction of extreme wave heights during tropical cyclones . 38
Annex I (informative) Recommendations for alignment of safety levels in tropical
cyclone regions . 39
Annex J (informative) Earthquakes . 40
Annex K (informative) Model tests . 41
Annex L (informative) Tsunamis . 43
L.1 General . 43
L.2 Numerical model of tsunami [3],[4] . 43
– 4 – IEC TS 61400-3-2:2019 © IEC 2019
L.3 Evaluation of variance of water surface elevation and current velocity [5]
...