Communication networks and systems for power utility automation - Part 7-420: Basic communication structure - Distributed energy resources and distribution automation logical nodes

This part of IEC 61850 defines the IEC 61850 information models to be used in the exchange
of information with distributed energy resources (DER) and Distribution Automation (DA)
systems. DERs include distribution-connected generation systems, energy storage systems,
and controllable loads, as well as facility DER management systems, including aggregated
DER, such as plant control systems, facility DER energy management systems (EMS), building
EMS, campus EMS, community EMS, microgrid EMS, etc. DA equipment includes equipment
used to manage distribution circuits, including automated switches, fault indicators, capacitor
banks, voltage regulators, and other power management devices.
The IEC 61850 DER information model standard utilizes existing IEC 61850-7-4 logical nodes
where possible, while defining DER and DA specific logical nodes to provide the necessary data
objects for DER and DA functions, including for the DER interconnection grid codes specified
by various countries and regions.
Although this document explicitly addresses distribution-connected resources, most of the
resource capabilities, operational functions, and architectures are also applicable to
transmission-connected resources

Kommunikationsnetze und -systeme für die Automatisierung in der elektrischen Energieversorgung – Teil 7-420: Grundlegende Kommunikationsstruktur-verteilte Energieerzeuger und und logische Knoten der Verteilungsautomation

Réseaux et systèmes de communication pour l'automatisation des systèmes électriques - Partie 7-420: Structure de communication de base - Ressources énergétiques décentralisées et nœuds logiques d'automatisation de la distribution

IEC 61850-7-420:2021 définit les modèles d'information IEC 61850 à utiliser pour l'échange d'informations avec les systèmes de ressources énergétiques décentralisées (DER) et les systèmes d'automatisation de la distribution (DA). Les DER comprennent les systèmes de production raccordés à la distribution, les systèmes de stockage d'énergie et les charges modulables, ainsi que les systèmes de gestion DER de l'installation, notamment les DER agrégées, telles que les systèmes de commande d'installation, les systèmes de gestion d'énergie (EMS) DER de l'installation, les EMS de construction, les EMS de campus, les EMS de collectivité, les EMS de microréseau, etc. Les équipements d'automatisation de la distribution (DA, Distribution Automation) incluent les équipements utilisés pour la gestion des circuits de distribution, notamment les interrupteurs automatisés, les indicateurs de défaut, les batteries de condensateurs, les régulateurs de tension, ainsi que les autres dispositifs de gestion de l'énergie. La norme du modèle d'information IEC 61850 DER utilise les nœuds logiques IEC 61850-7-4 existants lorsque cela est possible tout en définissant des nœuds logiques DER et DA spécifiques pour fournir les objets de données nécessaires aux fonctions DER et DA, notamment pour les codes de réseau d'interconnexion DER spécifiés par les différents pays et régions. Même si le présent document traite explicitement des ressources raccordées au réseau de distribution électrique, la plupart des capacités de ressources, des fonctions opérationnelles et des architectures s'appliquent également aux ressources raccordées au réseau électrique de transport. Cette deuxième édition annule et remplace la première édition parue en 2009. Cette édition constitue une révision technique. Cette édition inclut les modifications techniques majeures suivantes par rapport à l'édition précédente: a) approche générique de la modélisation pour prendre en charge tous les types de DER, y compris la production, le stockage et les charges modulables; b) approche générique pour prendre en charge les agrégations de DER virtuelles et physiques; c) prise en charge complète d'un large éventail de fonctions opérationnelles pour couvrir notamment les fonctions de codes de réseau décrites dans l'IEEE 1547 et l'EN 50549 ou l'IEC 62786.

Komunikacijska omrežja in sistemi za avtomatizacijo porabe električne energije - 7-420. del: Osnovna komunikacijska struktura - Porazdeljeni energijski viri in logična vozlišča avtomatizacije distribucije

V tem delu standarda IEC 61850 so opredeljeni informacijski modeli iz standarda IEC 61850, ki se uporabljajo pri izmenjavi informacij s sistemi porazdeljenih energijskih virov (DER) in avtomatizacije distribucije (DA). Sistemi porazdeljenih energijskih virov vključujejo proizvodne sisteme, povezane z distribucijskim omrežjem, sisteme za shranjevanje energije in obvladljive obremenitve ter sisteme za upravljanje porazdeljenih energijskih virov v obratih (vključno z združenimi sistemi), kot so regulacijski sistemi elektrarn, sistemi za upravljanje energije v obratih (EMS), sistemi za upravljanje energije v zgradbah, sistemi za upravljanje energije v skupnostih, sistemi za upravljanje energije v mikro omrežjih itd. Oprema za avtomatizacijo distribucije vključuje opremo, ki se uporablja za upravljanje razdelilnih tokokrogov, vključno z avtomatskimi stikali, kazalniki napak, kondenzatorskimi baterijami, regulatorji napetosti in drugimi napravami za upravljanje energije.
Standard informacijskega modela za porazdeljene energijske vire v skladu s standardom IEC 61850 uporablja obstoječa logična vozlišča iz standarda IEC 61850-7-4, kjer je to mogoče, ter obenem določa logična vozlišča, specifična za porazdeljene energijske vire in avtomatizacijo distribucije, s čimer se zagotovijo potrebni podatkovni objekti za funkcije porazdeljenih energijskih virov in avtomatizacije distribucije, vključno za omrežne kodekse medsebojne povezave porazdeljenih energijskih virov, ki jih določijo različne države in regije.
Čeprav ta dokument izrecno obravnava vire, povezane z distribucijskim omrežjem, je mogoče večino zmogljivosti virov, operativnih funkcij in arhitektur uporabiti tudi za prenosno povezane vire.

General Information

Status
Published
Publication Date
12-Jan-2022
Technical Committee
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
13-Dec-2021
Due Date
17-Feb-2022
Completion Date
13-Jan-2022

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SLOVENSKI STANDARD
SIST EN IEC 61850-7-420:2022
01-februar-2022
Nadomešča:
SIST EN 61850-7-420:2009

Komunikacijska omrežja in sistemi za avtomatizacijo porabe električne energije - 7

-420. del: Osnovna komunikacijska struktura - Porazdeljeni energijski viri in
logična vozlišča avtomatizacije distribucije

Communication networks and systems for power utility automation - Part 7-420: Basic

communication structure - Distributed energy resources and distribution automation

logical nodes
Ta slovenski standard je istoveten z: EN IEC 61850-7-420:2021
ICS:
29.240.30 Krmilna oprema za Control equipment for electric
elektroenergetske sisteme power systems
33.200 Daljinsko krmiljenje, daljinske Telecontrol. Telemetering
meritve (telemetrija)
SIST EN IEC 61850-7-420:2022 en

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

---------------------- Page: 1 ----------------------
SIST EN IEC 61850-7-420:2022
---------------------- Page: 2 ----------------------
SIST EN IEC 61850-7-420:2022
EUROPEAN STANDARD EN IEC 61850-7-420
NORME EUROPÉENNE
EUROPÄISCHE NORM
November 2021
ICS 33.200 Supersedes EN 61850-7-420:2009 and all of its
amendments and corrigenda (if any)
English Version
Communication networks and systems for power utility
automation - Part 7-420: Basic communication structure -
Distributed energy resources and distribution automation logical
nodes
(IEC 61850-7-420:2021)

Réseaux et systèmes de communication pour Kommunikationsnetze und -systeme für die

l'automatisation des systèmes électriques - Partie 7-420: Automatisierung in der elektrischen Energieversorgung -

Structure de communication de base - Ressources Teil 7-420: Grundlegende Kommunikationsstruktur-verteilte

énergétiques décentralisées et nœuds logiques Energieerzeuger und und logische Knoten der

d'automatisation de la distribution Verteilungsautomation
(IEC 61850-7-420:2021) (IEC 61850-7-420:2021)

This European Standard was approved by CENELEC on 2021-11-17. CENELEC members are bound to comply with the CEN/CENELEC

Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration.

Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC

Management Centre or to any CENELEC member.

This European Standard exists in three official versions (English, French, German). A version in any other language made by translation

under the responsibility of a CENELEC member into its own language and notified to the CEN-CENELEC Management Centre has the

same status as the official versions.

CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic,

Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the

Netherlands, Norway, Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,

Turkey and the United Kingdom.
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels

© 2021 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.

Ref. No. EN IEC 61850-7-420:2021 E
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SIST EN IEC 61850-7-420:2022
EN IEC 61850-7-420:2021 (E)
European foreword

The text of document 57/2392/FDIS, future edition 2 of IEC 61850-7-420, prepared by IEC/TC 57

“Power systems management and associated information exchange” was submitted to the IEC-

CENELEC parallel vote and approved by CENELEC as EN IEC 61850-7-420:2021.
The following dates are fixed:

• latest date by which the document has to be implemented at national (dop) 2022–08–17

level by publication of an identical national standard or by endorsement

• latest date by which the national standards conflicting with the (dow) 2024–11–17

document have to be withdrawn

This document supersedes EN 61850-7-420:2009 and all of its amendments and corrigenda (if any).

Attention is drawn to the possibility that some of the elements of this document may be the subject of

patent rights. CENELEC shall not be held responsible for identifying any or all such patent rights.

This document has been prepared under a Standardization Request given to CENELEC by the

European Commission and the European Free Trade Association.

Any feedback and questions on this document should be directed to the users’ national committee. A

complete listing of these bodies can be found on the CENELEC website.
Endorsement notice

The text of the International Standard IEC 61850-7-420:2021 was approved by CENELEC as a

European Standard without any modification.

In the official version, for Bibliography, the following notes have to be added for the standards

indicated:
IEC 61400-25-2 NOTE Harmonized as EN 61400-25-2
IEC 61850-7-410 NOTE Harmonized as EN 61850-7-410
IEC 62933 (series) NOTE Harmonized as EN IEC 62933 (series)
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SIST EN IEC 61850-7-420:2022
EN IEC 61850-7-420:2021 (E)
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications

The following documents are referred to in the text in such a way that some or all of their content

constitutes requirements of this document. For dated references, only the edition cited applies. For

undated references, the latest edition of the referenced document (including any amendments)

applies.

NOTE 1 Where an International Publication has been modified by common modifications, indicated by (mod), the

relevant EN/HD applies.

NOTE 2 Up-to-date information on the latest versions of the European Standards listed in this annex is available

here: www.cenelec.eu.
Publication Year Title EN/HD Year

IEC 61557-12 2018 Electrical safety in low voltage distribution FprEN 61557-12 2018

systems up to 1 000 V AC and 1 500 V DC
- Equipment for testing, measuring or
monitoring of protective measures - Part
12: Power metering and monitoring
devices (PMD)
IEC/TS 61850-2 - Communication networks and systems for - -
power utility automation - Part 2: Glossary
IEC 61850-7-2 2010 Communication networks and systems for EN 61850-7-2 2010
power utility automation - Part 7–2: Basic
information and communication structure -
Abstract communication service intervance
(ACSI)
/AMD1 2020 /A1 2020
IEC 61850-7-3 2010 Communication networks and systems for EN 61850-7-3 2011
power utility automation - Part 7–3: Basic
communication structure - Common data
classes
/AMD1 2020 /A1 2020
IEC 61850-7-4 2010 Communication networks and systems for EN 61850-7-4 2010
power utility automation - Part 7–4: Basic
communication structure - Compatible
logical node classes and data object
classes
/AMD1 2020 /A1 2020
IEC/TS 62786 - Distributed energy resources connection - -
with the grid
At draft stage.
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SIST EN IEC 61850-7-420:2022
EN IEC 61850-7-420:2021 (E)
IEEE 1547 2018 IEEE Standard for Interconnection and - -
Interoperability of Distributed Energy
Resources with Associated Electric Power
Systems Interfaces
ISO 4217 - Codes for the representation of currencies - -
and funds
Requirements for generating plants to be EN 50549 series
connected in parallel with distribution
networks
---------------------- Page: 6 ----------------------
SIST EN IEC 61850-7-420:2022
IEC 61850-7-420
Edition 2.0 2021-10
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Communication networks and systems for power utility automation –
Part 7-420: Basic communication structure – Distributed energy resources and
distribution automation logical nodes
Réseaux et systèmes de communication pour l'automatisation des systèmes
électriques –
Partie 7-420: Structure de communication de base – Ressources énergétiques
décentralisées et nœuds logiques d'automatisation de la distribution
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 33.200 ISBN 978-2-8322-1019-0

Warning! Make sure that you obtained this publication from an authorized distributor.

Attention! Veuillez vous assurer que vous avez obtenu cette publication via un distributeur agréé.

® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale
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SIST EN IEC 61850-7-420:2022
– 2 – IEC 61850-7-420:2021 © IEC 2021
CONTENTS

FOREWORD ......................................................................................................................... 15

INTRODUCTION ................................................................................................................... 18

1 Scope ............................................................................................................................ 20

1.1 General ................................................................................................................. 20

1.2 Published versions of this standard and related namespace name ........................ 20

1.3 Data model Namespace name and version ........................................................... 20

1.4 Data model Namespace Code Component distribution .......................................... 21

1.5 Changes from IEC 61850-7-420:2009 (Edition 1) .................................................. 22

1.6 IEC 61850-7-420 versus IEC 61850-7-520 ............................................................ 22

1.7 Terminology due to historical usage of terms ........................................................ 22

2 Normative references .................................................................................................... 23

3 Terms, definitions and abbreviated terms and acronyms ................................................ 23

3.1 Terms and definitions............................................................................................ 23

3.2 Generic abbreviations ........................................................................................... 32

3.3 Abbreviated terms ................................................................................................. 33

4 Concepts and constructs for managing DERs ................................................................ 46

4.1 Hierarchical concepts for DER facilities and plants ............................................... 46

4.1.1 DER stakeholders .......................................................................................... 46

4.1.2 Conceptual DER hierarchical architecture ...................................................... 47

4.1.3 DER information capabilities .......................................................................... 49

4.1.4 Concept of a recursive model for the term "DER" ........................................... 51

4.2 DER generic model and its components ................................................................ 51

4.2.1 General ......................................................................................................... 51

4.2.2 Editorial rules ................................................................................................ 51

4.2.3 Main principles .............................................................................................. 52

4.2.4 Power management model ............................................................................ 56

4.2.5 DEResourceLN class structure and composition model.................................. 61

4.2.6 Common properties of DER as resource class ............................................... 75

4.2.7 DER electrical connection point (ECP) model ................................................ 83

4.2.8 DER operational functions model ................................................................... 89

4.3 Interaction mechanisms between DER components .............................................. 89

4.3.1 Handling of computed setpoints ..................................................................... 89

4.3.2 Interaction between a DEResourceLN and its component LNs ....................... 89

4.3.3 Interactions between power management function LN and operational

functions LN .................................................................................................. 90

4.3.4 Interactions between power management function LN and the resource

LN – case of multiple layered resources ........................................................ 99

4.3.5 Interactions between ECP LN and LNs related to ECP (measurements,

ECP status, etc.) ......................................................................................... 100

4.3.6 Interactions between equivalent representations of a same resource ........... 100

5 State machine and capabilities of different types of DERs ........................................... 102

5.1 General ............................................................................................................... 102

5.2 DER generic state machine for connecting DER at its ECP ................................. 102

5.2.1 General ....................................................................................................... 102

5.2.2 Diagram of the generic DER state machine .................................................. 102

5.2.3 DERStateKind enumeration ......................................................................... 104

5.2.4 DERStateTransitionKind enumeration .......................................................... 105

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5.2.5 DER Testing capabilities .............................................................................. 106

5.3 LNs related to generation .................................................................................... 107

5.3.1 Generic DER generator LNs ........................................................................ 107

5.3.2 DER reciprocating (diesel) engine LNs ........................................................ 108

5.3.3 Fuel cell LNs ............................................................................................... 109

5.3.4 Photovoltaic LNs ......................................................................................... 110

5.3.5 Combined Heat and Power LNs ................................................................... 114

5.3.6 DER fuel system LNs ................................................................................... 117

5.3.7 DER excitation LNs ..................................................................................... 118

5.3.8 DER inverter LNs ......................................................................................... 118

5.4 LNs related to storage......................................................................................... 119

5.4.1 EESS description ......................................................................................... 119

5.4.2 Functional requirements of EESSs............................................................... 120

5.4.3 EESSs participating in grid operations as a DER system ............................. 120

5.4.4 Definitions of the capacity and the state of charge of an EESS .................... 123

5.5 LNs related to loads ............................................................................................ 124

5.6 Measurement extension functions ....................................................................... 125

5.7 Financial-related LNs .......................................................................................... 125

5.7.1 DER cost LNs .............................................................................................. 125

5.7.2 Pricing-related LNs ...................................................................................... 126

6 Operational Functions (including Grid Codes functions) ............................................... 126

6.1 General ............................................................................................................... 126

6.2 Overview of Logical Nodes for Operational Functions ......................................... 126

6.3 Main modelling principles .................................................................................... 127

6.3.1 Benefits of operational functions to manage DER ........................................ 127

6.3.2 Operational function enabling/disabling (Mod) ............................................. 128

6.3.3 DER autonomous behavior enabled by operational functions ....................... 129

6.3.4 Priority, Ideal, Max, Min management between operational functions ........... 129

6.3.5 Operational functions operating at a given ECP ........................................... 131

6.3.6 Different ways to describe operational function curves ................................. 131

6.3.7 Percentages as size-neutral parameters ...................................................... 131

6.3.8 Hysteresis within operational functions ........................................................ 132

6.3.9 Typical digital signal processing to support operational functions ................ 134

6.3.10 Ramp rate upon enabling an operational function ........................................ 135

6.3.11 Randomized response times upon enabling an operational function............. 135

6.3.12 Timeout period ............................................................................................ 135

6.3.13 Multiple usages of a same operational function ............................................ 135

6.3.14 Multiple operational functions ...................................................................... 136

6.3.15 Uncertainty of requests from external stakeholders for operational

functions ...................................................................................................... 136

6.3.16 Expected responses to operational functions versus actual values from

direct commands ......................................................................................... 136

6.4 Cease-to-Energize operational function and its interaction with the power

management function .......................................................................................... 137

6.5 Voltage Ride-Through operational function ......................................................... 140

6.5.1 General ....................................................................................................... 140

6.5.2 European and North American voltage ride-through functions ...................... 141

6.5.3 LN DHVT and DLVT: Voltage ride-through ................................................... 143

6.6 Frequency Ride-Through operational function ..................................................... 144

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SIST EN IEC 61850-7-420:2022
– 4 – IEC 61850-7-420:2021 © IEC 2021

6.6.1 General ....................................................................................................... 144

6.6.2 North American frequency ride-through ....................................................... 144

6.6.3 LN DHFT and DLFT: Frequency Ride-Through ............................................ 145

6.7 Frequency-Active Power operational functions .................................................... 146

6.7.1 Overview of Frequency-Active Power functions............................................ 146

6.7.2 LN DHFW: High Frequency-Active Power operational function ..................... 159

6.7.3 LN DLFW: Low Frequency-Active Power operational function ...................... 160

6.8 Active power operational functions ...................................................................... 160

6.8.1 LN DVWC: Voltage-Active Power (V-W) operational function ....................... 160

6.8.2 LN DWGC: Set Active Power for generating or consuming operational

function ....................................................................................................... 161

6.8.3 LN DWFL: Active Power Following operational function ............................... 161

6.8.4 LN DAGC: Automatic Generation Control (AGC) operational function .......... 163

6.8.5 LN DTCD: Coordinated Charge/Discharge operational function ................... 164

6.8.6 LN DWMX: Limit Maximum Active Power operational function ..................... 164

6.8.7 LN DWMN: Limit Minimum Active Power operational function ...................... 165

6.9 Power factor operational functions ...................................................................... 165

6.9.1 General ....................................................................................................... 165

6.9.2 LN DFPF: Set Fixed Power Factor operational function ............................... 165

6.10 Reactive power operational functions .................................................................. 166

6.10.1 General ....................................................................................................... 166

6.10.2 LN DVVR: Voltage-Reactive Power (V-var) operational function .................. 166

6.10.3 LN DVAR: Constant Reactive Power operational function ............................ 169

6.10.4 LN DWVR: Active Power–Reactive Power (W-Var) operational function ....... 170

6.10.5 LN DRGS: Dynamic Reactive Current Support operational function ............. 171

Annex A (normative) Data model ....................................................................................... 176

A.1 Global overview .................................................................................................. 176

A.2 Reminder of the main IEC 61850-7-4 abstract classes used in this document

and other rules .................................................................................................... 178

A.3 Namespace data model ...................................................................................... 179

A.3.1 Logical node classes for distributed energy resources

(LogicalNodes_7_420_DER) ........................................................................ 179

A.3.2 DER Operational functions

(LogicalNodes_7_420_Operational_Functions) ............................................ 336

A.3.3 Data semantics ............................................................................................ 451

A.3.4 Enumerated data attribute types .................................................................. 483

Annex B (informative) DER hierarchy modelling rules and examples .................................. 508

B.1 Main principles application .................................................................................. 508

B.1.1 General ....................................................................................................... 508

B.1.2 Applying the DER composition modelling rules ............................................ 508

B.1.3 Applying the DER class model ..................................................................... 508

B.1.4 Exposing some DER properties through the generic interface ...................... 508

B.1.5 Applying the dynamic relationships between the core DER modelling

elements ...................................................................................................... 508

B.2 Examples ............................................................................................................ 508

B.2.1 Global DER models applying to a campus of two buildings .......................... 508

B.2.2 Example of modelling a composed DER made of (PV+BAT)+BAT on a

single plant .................................................................................................. 513

B.2.3 Global DER modelling applying to shared DER (30 %PV + 30 %BAT)

and (70 %PV + 70 %BAT) on a single plant ................................................. 514

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IEC 61850-7-420:2021 © IEC 2021 – 5 –

B.2.4 Mapping example in case of a complex storage installation ......................... 515

Annex C (normative) Backward compatibility with IEC 61850-7-420 Edition 1 .................... 517

Annex D (informative) DER operational functions ............................................................... 525

D.1 List of DER mandatory grid codes ....................................................................... 525

D.2 Table of DER functions ....................................................................................... 525

D.3 Combining DER operational functions using the concepts of Ideal, Max, Min

instantiations ...................................................................................................... 533

D.4 Scheduling with Ideal, Max, Min .......................................................................... 536

Annex E (informative) Examples of implementation to support Low Voltage ride

through ........................................................................................................................ 538

E.1 Case of European grid codes .............................................................................. 538

E.2 Case of IEEE 1547 requirements ........................................................................ 540

Annex F (Informative) Handling of setpoints with IEC 61850-7-3 Ed 2.1 and Ed 2.2 ........... 543

F.1 Main features associated to setpoints ................................................................. 543

F.2 Main 61850 client-server modelling principles ..................................................... 545

F.3 Modelling rules for implementing computed setpoints ......................................... 545

F.4 Implementing setpoints with Edition 2.1 .............................................................. 546

Bibliography ........................................................................................................................ 548

Figure 1 – Conceptual hierarchical architecture of DER information interactions with

other entities ......................................................................................................................... 48

Figure 2 – Recursive composition of DERs ........................................................................... 51

Figure 3 – Graphical UML representation convention ............................................................ 52

Figure 4 – DER generic model: Comprised of 4 types of components ................................... 53

Figure 5 – DER generic model: Typical components main interactions (single level) ............. 54

Figure 6 – DER generic model: Components main interactions (multiple levels) .................... 55

Figure 7 – DER generic model: simplest interaction implementation in the case of a

single source of controls ....................................................................................................... 55

Figure 8 – Power management situation 1: Handling multiple differential active power

requests, compatible with the operational capacity of the resource ....................................... 58

Figure 9 – Power management situation 2: Handling multiple differential active power

requests, exceeding the operational capacity of the resource ............................................... 58

Figure 10 – Power management situation 3: Handling competing multiple total active

power at ECP requests ......................................................................................................... 59

Figure 11 – Power management situation 4: Combination of situation 2 and situation 3 ........ 59

Figure 12 – Power management situation 5: Multiple competing active power limiting

request ................................................................................................................................. 60

Figure 13 – Power management situation 6: Combination of all situations............................. 60

Figure 14 – Example: Simple DER resource model of a PV generating unit (instance &

class) .................................................................................................................................... 62

Figure 15 – Hierarchical class model of DER resources – basic principles ............................ 63

Figure 16 – DER composition model principles ..................................................................... 64

Figure 17 – Impacts of composition requirements on the DER class model ........................... 65

Figure 18 – Needed association to express DER generic capabilities .................................... 66

Figure 19 – Exposing the generic interfaces of a mixed DER ................................................ 67

Figure 20 – Exposing the generic interfaces of a storage DER (battery storage as

example) ............................................................................................................................... 68

----------------------
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Questions, Comments and Discussion

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