Wind energy generation systems - Part 26-1: Availability for wind energy generation systems

IEC 61400-26-1:2019 defines an information model from which time-based, and production-based availability indicators for services can be derived and reported.
The purpose is to provide standardised metrics that can be used to create and organise methods for availability calculation and reporting according to the user’s needs.
The document provides information categories, which unambiguously describe how data is used to characterise and categorise the operation. The information model specifies category priority for discrimination between possible concurrent categories. Further, the model defines entry and exit criteria to allocate fractions of time and production values to the proper information category. A full overview of all information categories, exit and entry criteria is given in Annex.
The document can be applied to any number of WTGSs, whether represented by an individual turbine, a fleet of wind turbines, a wind power station or a portfolio of wind power stations. A wind power station is typically made up of all WTGSs, functional services and balance of plant elements as seen from the point of common coupling.
This first edition cancels and replaces IEC TS 61400-26-1:2011, IEC TS 61400-26-2:2014 and IEC TS 61400-26-3:2016.

Systèmes de génération d'énergie éolienne - Partie 26-1: Disponibilité des systèmes de génération d'énergie éolienne

l'IEC 61400-26-1:2019 définit un modèle d'informations à partir duquel peuvent être déduits et consignés les indicateurs de disponibilité temporelle et en production des services.
Il s'agit de fournir des mesures normalisées pouvant être utilisées pour créer et organiser des méthodes de calcul et de déclaration de la disponibilité en fonction des besoins de l'utilisateur.
Le présent document fournit des catégories d'informations, qui décrivent clairement la manière dont les données sont utilisées pour caractériser et catégoriser le fonctionnement. Le modèle d'informations spécifie une priorité de catégorie permettant de distinguer les différentes catégories concurrentes possibles. En outre, le modèle définit les critères d'entrée et de sortie permettant d'attribuer des fractions de temps et des valeurs de production à la catégorie d'informations adéquate. Une vue d'ensemble de toutes les catégories d'informations, des critères d'entrée et des critères de sortie est fournie à l'annexe.
Le présent document peut être appliqué à un certain nombre d'aérogénérateurs (éolienne individuelle, parc d'éoliennes, centrale éolienne ou ensemble de centrales éoliennes). Une centrale éolienne est généralement composée de l'ensemble des aérogénérateurs, services fonctionnels et éléments d'installation de production d'énergie, considérés par rapport au point de couplage commun (PCC).
Cette première édition annule et remplace l'IEC TS 61400-26-1:2011, l'IEC TS 61400-26-2:2014 and l'IEC TS 61400-26-3:2016.

General Information

Status
Published
Publication Date
28-May-2019
Current Stage
PPUB - Publication issued
Completion Date
29-May-2019
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IEC 61400-26-1
Edition 1.0 2019-05
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Wind energy generation systems –
Part 26-1: Availability for wind energy generation systems
Systèmes de génération d'énergie éolienne –
Partie 26-1: Disponibilité des systèmes de génération d'énergie éolienne
IEC 61400-26-1:2019-05(en-fr)
---------------------- Page: 1 ----------------------
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---------------------- Page: 2 ----------------------
IEC 61400-26-1
Edition 1.0 2019-05
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Wind energy generation systems –
Part 26-1: Availability for wind energy generation systems
Systèmes de génération d'énergie éolienne –
Partie 26-1: Disponibilité des systèmes de génération d'énergie éolienne
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 27.180 ISBN 978-2-8322-6797-4

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® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale
---------------------- Page: 3 ----------------------
– 2 – IEC 61400-26-1:2019 © IEC 2019
CONTENTS

FOREWORD ........................................................................................................................... 8

INTRODUCTION ................................................................................................................... 10

1 Scope ............................................................................................................................ 12

2 Normative references .................................................................................................... 12

3 Terms, definitions and abbreviated terms ...................................................................... 13

3.1 Terms and definitions ............................................................................................ 13

3.2 Abbreviated terms ................................................................................................. 15

4 Information model .......................................................................................................... 18

4.1 Basic model .......................................................................................................... 18

4.2 Information categories .......................................................................................... 18

4.3 Information category priority ................................................................................. 19

4.4 Services ................................................................................................................ 20

4.5 Service delivery layers .......................................................................................... 21

4.5.1 General ......................................................................................................... 21

4.5.2 Time layer ..................................................................................................... 21

4.5.3 Actual service delivery layer .......................................................................... 21

4.5.4 Potential service delivery layer ...................................................................... 21

4.5.5 Lost service ................................................................................................... 22

4.6 Modelling multiple services ................................................................................... 22

4.7 Determination of information categories for the WPS ............................................ 24

4.8 Application of the information model to components of the WEGS......................... 25

5 Information categories ................................................................................................... 25

5.1 INFORMATION AVAILABLE .................................................................................. 25

5.2 OPERATIVE ......................................................................................................... 26

5.3 IN SERVICE ......................................................................................................... 26

5.3.1 General ......................................................................................................... 26

5.3.2 FULL PERFORMANCE .................................................................................. 26

5.3.3 PARTIAL PERFORMANCE ............................................................................ 27

5.3.4 READY STANDBY ......................................................................................... 27

5.4 OUT OF SERVICE ................................................................................................ 28

5.4.1 General ......................................................................................................... 28

5.4.2 TECHNICAL STANDBY ................................................................................. 28

5.4.3 OUT OF ENVIRONMENTAL SPECIFICATION ............................................... 28

5.4.4 REQUESTED SHUTDOWN ............................................................................ 29

5.4.5 OUT OF ELECTRICAL SPECIFICATION ....................................................... 29

5.5 NON-OPERATIVE ................................................................................................. 30

5.5.1 General ......................................................................................................... 30

5.5.2 SCHEDULED MAINTENANCE ....................................................................... 30

5.5.3 PLANNED CORRECTIVE ACTION ................................................................ 30

5.5.4 FORCED OUTAGE ........................................................................................ 31

5.5.5 SUSPENDED................................................................................................. 31

5.6 FORCE MAJEURE ................................................................................................ 32

5.7 INFORMATION UNAVAILABLE ............................................................................. 32

Annex A (informative) Entry and exit conditions overview for WEGS .................................... 33

Annex B (informative) Optional information categories for WEGS information model –

illustrative explanation and examples .................................................................................... 34

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IEC 61400-26-1:2019 © IEC 2019 – 3 –

B.1 General ................................................................................................................. 34

B.2 PARTIAL PERFORMANCE – optional categories .................................................. 34

B.2.1 Introduction of optional categories ................................................................. 34

B.2.2 Derated ......................................................................................................... 34

B.2.3 Degraded....................................................................................................... 35

B.3 OUT OF ENVIRONMENTAL SPECIFICATION – optional categories ..................... 36

B.3.1 Introduction of optional categories ................................................................. 36

B.3.2 Calm winds .................................................................................................... 36

B.3.3 Other environmental ...................................................................................... 36

B.4 PLANNED CORRECTIVE ACTION – optional categories ...................................... 37

B.4.1 Introduction of optional categories ................................................................. 37

B.4.2 Retrofit .......................................................................................................... 37

B.4.3 Upgrade ........................................................................................................ 37

B.4.4 Other planned corrective action ..................................................................... 37

B.5 FORCED OUTAGE – optional category ................................................................. 38

B.5.1 Introduction of optional categories ................................................................. 38

B.5.2 Response ...................................................................................................... 38

B.5.3 Diagnostic ..................................................................................................... 39

B.5.4 Logistic .......................................................................................................... 39

B.5.5 Repair ........................................................................................................... 39

B.6 SUSPENDED – optional categories....................................................................... 40

B.6.1 Introduction of optional categories ................................................................. 40

B.6.2 Suspended scheduled maintenance ............................................................... 40

B.6.3 Suspended planned corrective action ............................................................ 40

B.6.4 Suspended forced outage .............................................................................. 40

B.7 Considerations of competing assignment of lost service ........................................ 41

Annex C (informative) Examples of availability indicators ..................................................... 42

C.1 General ................................................................................................................. 42

C.1.1 Introduction to the scope of this annex .......................................................... 42

C.1.2 Time-based availability .................................................................................. 42

C.1.3 Production-based availability ......................................................................... 42

C.1.4 Mapping of availability and unavailability ....................................................... 43

C.2 Time-based availability ......................................................................................... 43

C.2.1 General ......................................................................................................... 43

C.2.2 Time-based availability – "operational availability" ......................................... 43

C.2.3 Time based availability – "technical availability" ............................................. 45

C.3 Production-based availability ................................................................................ 46

C.3.1 General ......................................................................................................... 46

C.3.2 Production-based availability – "operational availability" ................................ 46

C.3.3 Production-based availability – "technical availability".................................... 47

C.4 Capacity factor and other performance indicators ................................................. 48

C.4.1 General ......................................................................................................... 48

C.4.2 Capacity factor .............................................................................................. 49

C.4.3 Production ratio ............................................................................................. 49

C.4.4 Mean-value based information ....................................................................... 49

Annex D (informative) Verification scenarios – examples ..................................................... 50

D.1 General ................................................................................................................. 50

D.2 Time-based scenarios for a WTGS ........................................................................ 50

D.2.1 Introduction to verification scenarios .............................................................. 50

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– 4 – IEC 61400-26-1:2019 © IEC 2019

D.2.2 Scenario 1 – communication aspects ............................................................. 51

D.2.3 Scenario 2 – partial operational aspects ........................................................ 52

D.2.4 Scenario 3 – maintenance aspects ................................................................ 53

D.2.5 Scenario 4 – operational aspects ................................................................... 54

D.2.6 Scenario 5 – grid/electrical network aspects .................................................. 57

D.2.7 Scenario 6 – environmental aspects .............................................................. 58

D.3 Production-based scenarios for a WTGS ............................................................... 60

D.3.1 Introduction to verification scenarios .............................................................. 60

D.3.2 Scenarios under FULL PERFORMANCE ........................................................ 60

D.3.3 Scenarios under PARTIAL PERFORMANCE .................................................. 62

D.3.4 Scenarios under READY STANDBY ............................................................... 64

D.3.5 Scenarios under TECHNICAL STANDBY ....................................................... 65

D.3.6 Scenarios under OUT OF ENVIRONMENTAL SPECIFICATION ..................... 66

D.3.7 Scenarios under REQUESTED SHUTDOWN ................................................. 67

D.3.8 Scenarios under OUT OF ELECTRICAL SPECIFICATION ............................. 68

D.3.9 Scenarios under SCHEDULED MAINTENANCE ............................................. 69

D.3.10 Scenarios under PLANNED CORRECTIVE ACTION ...................................... 69

D.3.11 Scenarios under FORCED OUTAGE .............................................................. 70

D.3.12 Scenarios under SUSPENDED ...................................................................... 71

D.3.13 Scenarios under FORCE MAJEURE .............................................................. 72

D.4 Production-based scenarios for a WTGS – calculation of lost production .............. 72

D.4.1 Introduction to verification scenarios .............................................................. 72

D.4.2 Production-based availability algorithm based on mandatory information

categories ("operational availability") ............................................................. 72

D.4.3 Production-based availability algorithm – including optional categories

("technical availability") .................................................................................. 75

D.5 Production-based scenarios for a WPS ................................................................. 76

D.5.1 Introduction to verification scenarios .............................................................. 76

D.5.2 Example 1: Normal operation – all WPS ........................................................ 76

D.5.3 Example 2: Normal operation – part of WPS .................................................. 77

D.5.4 Example 3: Contaminated WTGSs blades – all WPS ..................................... 78

D.5.5 Example 4: Contaminated WTGSs blades – part of WPS ............................... 79

D.5.6 Example 5: BOP limitations – all WPS ........................................................... 80

D.5.7 Example 6: BOP limitations – part of WPS ..................................................... 81

D.5.8 Example 7: "Spinning reserve" – part of WPS ................................................ 82

D.5.9 Example 8: "Spinning reserve" – all WPS ...................................................... 83

D.5.10 Example 9: Noise restrictions – warranty related ........................................... 84

D.5.11 Example 10: Noise restrictions – environmentally related .............................. 86

D.5.12 Example 11: Ice storm on grid – all WPS ....................................................... 87

Annex E (informative) Possible methods for determination of potential WEGS energy

production ............................................................................................................................. 89

E.1 General ................................................................................................................. 89

E.2 Specific power curve and velocities methods ........................................................ 89

E.2.1 General ......................................................................................................... 89

E.2.2 Nacelle anemometer wind measurement with power curve ............................ 89

E.2.3 Upstream wind measurement with power curve ............................................. 90

E.2.4 Met mast wind measurement with correction factors and power curve............ 90

E.3 Power-based methods .......................................................................................... 91

E.3.1 General ......................................................................................................... 91

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IEC 61400-26-1:2019 © IEC 2019 – 5 –

E.3.2 Average production of WPS ........................................................................... 91

E.3.3 Average production of representative comparison WTGSs ............................. 92

E.3.4 Data acquisition with comparison chart/database ........................................... 93

E.3.5 Average wind speed of WPS .......................................................................... 93

E.4 Determination of potential production for a WPS – examples ................................ 94

E.4.1 Overview ....................................................................................................... 94

E.4.2 Primary service .............................................................................................. 94

E.4.3 Secondary services ....................................................................................... 94

Annex F (informative) Balance of plant integration ............................................................... 96

F.1 WPS functions and services .................................................................................. 96

F.2 Externally required functions and services ............................................................ 96

F.3 Internally required functions and services ............................................................. 96

F.4 Expansion of the information model for BOP functions and services ..................... 97

Bibliography .......................................................................................................................... 98

Figure 1 – Data stakeholders for a wind energy generation system ....................................... 10

Figure 2 – Information category overview .............................................................................. 19

Figure 3 – Information category priority ................................................................................. 20

Figure 4 – Three-layer information model .............................................................................. 21

Figure 5 – Information categories, definitions for layer 2 and layer 3, mandatory

categories ............................................................................................................................. 23

Figure 6 – Examples of an information model representing active energy, reactive

energy, high and low frequency response services ............................................................... 24

Figure A.1 – Overview of the entry and exit conditions of all mandatory information

categories described in this document .................................................................................. 33

Figure B.1 – Information category overview – mandatory and optional .................................. 35

Figure B.2 – Workflow breakdown structure .......................................................................... 38

Figure B.3 – Example of simultaneous degrading and derating ............................................. 41

Figure E.1 – Step 1: Calculation of wind speed based on working WEGS 1 to n .................... 93

Figure E.2 – Step 2: Estimation of lost production for WEGS not in FULL

PERFORMANCE .................................................................................................................. 94

Table C.1 – Example of mapping of available and unavailable information categories ........... 43

Table D.1 – Verification scenarios – time allocation to information categories ....................... 50

Table D.2 – Verification scenarios – communication aspects ................................................ 51

Table D.3 – Verification scenarios – partial operational aspects ............................................ 52

Table D.4 – Verification scenarios – maintenance aspects .................................................... 53

Table D.5 – Verification scenarios – operational aspects ...................................................... 54

Table D.6 – Verification scenarios – grid / electrical network aspects .................................... 57

Table D.7 – Verification scenarios – environmental aspects .................................................. 58

Table D.8 – FULL PERFORMANCE: By definition, actual energy production is equal to

the potential energy production ............................................................................................. 60

Table D.9 – FULL PERFORMANCE: Actual energy production is less than potential

energy production but within agreed uncertainty ................................................................... 61

Table D.10 – FULL PERFORMANCE: Actual energy production greater than potential

energy production ................................................................................................................. 61

Table D.11 – PARTIAL PERFORMANCE – derated: Grid constraint ...................................... 62

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– 6 – IEC 61400-26-1:2019 © IEC 2019
Table D.12 – PARTIAL PERFORMANCE – derated: Grid constraint, actual energy

production less than requested ............................................................................................. 62

Table D.13 – Partial performance – derated: Output constraint due to excessive noise

of the WTGS ......................................................................................................................... 63

Table D.14 – PARTIAL PERFORMANCE – derated: Dirt on blades constrained

performance ......................................................................................................................... 63

Table D.15 – PARTIAL PERFORMANCE – derated: Ice accumulated on blades has
been detected, WTGS is allowed to operate although the power performance is

‘derated’ ............................................................................................................................... 64

Table D.16 – PARTIAL PERFORMANCE – degraded: WTGS deterioration known to the

WTGS user ........................................................................................................................... 64

Table D.17 – READY STANDBY: Avian detection system ..................................................... 64

Table D.18 – READY STANDBY: Automatic generation control – Var support ....................... 65

Table D.19 – TECHNICAL STANDBY: WTGS is cable unwinding .......................................... 65

Table D.20 – OUT OF ENVIRONMENTAL SPECIFICATION – calm winds ............................ 66

Table D.21 – OUT OF ENVIRONMENTAL SPECIFICATION – high winds ............................. 66

Table D.22 – OUT OF ENVIRONMENTAL SPECIFICATION – temperature too high ............ 66

Table D.23 – REQUESTED SHUTDOWN: ice on blades is detected and WTGS user

requests shutdown of the WTGS ........................................................................................... 67

Table D.24 – REQUESTED SHUTDOWN: Sector management ............................................. 67

Table D.25 – REQUESTED SHUTDOWN: Noise nuisance – warranty claim .......................... 68

Table D.26 – OUT OF ELECTRICAL SPECIFICATION: Low voltage ..................................... 68

Table D.27 – SCHEDULED MAINTENANCE: WTG
...

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