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IEC 61400-3-1
Edition 1.0 2019-04
INTERNATIONAL
STANDARD
colour
inside
Wind energy generation systems –
Part 3-1: Design requirements for fixed offshore wind turbines
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IEC 61400-3-1
Edition 1.0 2019-04
INTERNATIONAL
STANDARD
colour
inside
Wind energy generation systems –
Part 3-1: Design requirements for fixed offshore wind turbines
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 27.180 ISBN 978-2-8322-6600-7
– 2 – IEC 61400-3-1:2019 © IEC 2019
CONTENTS
FOREWORD . 7
INTRODUCTION . 9
1 Scope . 10
2 Normative references . 10
3 Terms and definitions . 11
4 Symbols and abbreviated terms . 19
4.1 Symbols and units. 19
4.2 Abbreviations . 20
5 Principal elements . 21
5.1 General . 21
5.2 Design methods . 21
5.3 Safety classes . 22
5.4 Quality assurance . 22
5.5 Rotor–nacelle assembly markings . 23
6 External conditions – definition and assessment . 23
6.1 General . 23
6.2 Wind turbine classes . 24
6.3 Definition of external conditions at an offshore wind turbine site . 24
6.3.1 General . 24
6.3.2 Wind conditions . 25
6.3.3 Marine conditions . 25
6.3.4 Electrical power network conditions . 32
6.3.5 Other environmental conditions . 32
6.4 Assessment of external conditions at an offshore wind turbine site . 33
6.4.1 General . 33
6.4.2 The metocean database . 33
6.4.3 Assessment of wind conditions . 34
6.4.4 Assessment of marine conditions . 36
6.4.5 Assessment of other environmental conditions . 40
6.4.6 Assessment of electrical network conditions . 41
6.4.7 Assessment of soil conditions . 41
7 Structural design . 42
7.1 General . 42
7.2 Design methodology . 42
7.3 Loads. 42
7.3.1 General . 42
7.3.2 Gravitational and inertial loads . 42
7.3.3 Aerodynamic loads . 43
7.3.4 Actuation loads . 43
7.3.5 Hydrodynamic loads . 43
7.3.6 Sea/lake ice loads . 43
7.3.7 Other loads . 44
7.4 Design situations and load cases . 44
7.4.1 General . 44
7.4.2 Power production (DLC 1.1 to 1.6) . 50
7.4.3 Power production plus occurrence of fault or loss of electrical network
connection (DLC 2.1 – 2.5) . 51
7.4.4 Start up (DLC 3.1 to 3.3). 53
7.4.5 Normal shutdown (DLC 4.1 to 4.2) . 54
7.4.6 Emergency stop (DLC 5.1) . 54
7.4.7 Parked (standstill or idling) (DLC 6.1 to 6.4) . 55
7.4.8 Parked plus fault conditions (DLC 7.1 to 7.2) . 56
7.4.9 Transport, assembly, maintenance and repair (DLC 8.1 to 8.4) . 57
7.4.10 Sea/lake ice design load cases . 60
7.5 Load and load effect calculations . 61
7.5.1 General . 61
7.5.2 Relevance of hydrodynamic loads . 61
7.5.3 Calculation of hydrodynamic loads . 62
7.5.4 Calculation of sea/lake ice loads . 62
7.5.5 Overall damping assessment for support structure response evaluations . 62
7.5.6 Simulation requirements . 64
7.5.7 Other requirements . 65
7.6 Ultimate limit state analysis. 66
7.6.1 Method . 66
7.6.2 Ultimate strength analysis . 68
7.6.3 Fatigue failure . 68
7.6.4 Special partial safety factors . 69
7.6.5 Assessment of cyclic loading for foundation assessment . 69
8 Control system . 69
9 Mechanical systems . 70
10 Electrical system . 70
11 Foundation and substructure design . 70
12 Assembly, installation and erection . 71
12.1 General . 71
12.2 Planning . 72
12.3 Installation conditions . 72
12.4 Site access . 72
12.5 Environmental conditions . 73
12.6 Documentation . 73
12.7 Receiving, handling and storage . 73
12.8 Support structure systems . 73
12.9 Assembly of offshore wind turbine . 73
12.10 Erection of offshore wind turbine . 74
12.11 Fasteners and attachments . 74
12.12 Cranes, hoists and lifting equipment . 74
13 Commissioning, operation and maintenance . 74
13.1 General . 74
13.2 Design requirements for safe operation, inspection and maintenance . 75
13.3 Instructions concerning commissioning . 76
13.3.1 General . 76
13.3.2 Energization . 76
13.3.3 Commissioning tests . 76
13.3.4 Records . 76
– 4 – IEC 61400-3-1:2019 © IEC 2019
13.3.5 Post commissioning activities . 76
13.4 Operator’s instruction manual . 76
13.4.1 General . 76
13.4.2 Instr
...