IEC 61968-5:2020

Application integration at electric utilities - System interfaces for distribution management - Part 5: Distributed energy optimization

IEC 61968-5:2020 is the description of a set of functions that are needed for enterprise integration of DERMS functions. These exchanges are most likely between a DERMS and a DMS. However, since this is an enterprise integration standard which may leverage IEC 61968-100:2013 for application integration (using web services or JMS) or other loosely-coupled implementations, there are no technical limitations for systems with which a DERMS might exchange information. Also, it should be noted that a DERMS might communicate with individual DER using a variety of standards and protocols such as IEC 61850, IEEE 2030.5, Distribution Network Protocol (DNP), Sunspec Modbus, or perhaps Open Field Message Bus (OpenFMB). One role of the DERMS is to manage this disparity and complexity of communications on the behalf of the system operator. However, the communication to individual DER is out of scope of this standard. Readers should look to those standards to understand communication to individual DER’s smart inverter.
The scope will be limited to the following use case categories:
• DER group creation – a mechanism to manage DER in aggregate
• DER group maintenance – a mechanism to add, remove, or modify the members and/or aggregated capabilities of a given group of DER
• DER group deletion – removing an entire group
• DER group status monitoring – a mechanism for quantifying or ascertaining the current capabilities and/or status of a group of DER
• DER group forecast – a mechanism for predicting the capabilities and/or status of a group of DER for a given time period in the future
• DER group dispatch – a mechanism for requesting that specified capabilities of a group of DER be dispatched to the grid
• DER group voltage ramp rate control – a mechanism for requesting that a DER group following a ramp rate curve
• DER group connect/disconnect – a mechanism to request that DER either isolate themselves, or reconnect to the grid as needed.

Intégration d'applications pour les services électriques - Interfaces système pour la gestion de distribution - Partie 5: Optimisation de l'énergie distribuée

IEC 61968-5:2020 est la description d'un ensemble de fonctions indispensables à l'intégration par les entreprises des fonctions DERMS. Ces échanges sont les plus susceptibles d'avoir lieu entre un DERMS et un DMS. Toutefois, étant donné qu'une norme d'intégration par les entreprises peut s'appuyer sur l'IEC 61968 100:2013 pour l'intégration d'applications (par le biais de services web ou de la technologie JMS) ou d'autres implémentations faiblement couplées, les systèmes avec lesquels un DERMS peut échanger des informations ne font l'objet d'aucune limite technique. De même, il convient de noter qu'un DERMS peut communiquer avec une DER individuelle en utilisant une variété de normes et de protocoles comme l'IEC 61850, l'IEEE 2030.5, le protocole DNP (Distribution Network Protocol – Protocole de réseau de distribution), Sunspec Modbus, voire Open Field Message Bus (OpenFMB). Un rôle du DERMS consiste à gérer cette disparité et cette complexité des communications au nom de l'opérateur système. Toutefois, la communication avec la DER individuelle est hors du domaine d'application de la présente norme. Il convient que le lecteur consulte ces normes pour comprendre la communication avec l'onduleur intelligent d'une DER individuelle.
Le domaine d'application est limité aux catégories de cas d'utilisation suivantes:
• création de groupe de DER – mécanisme de gestion de DER en agrégat;
• maintenance de groupe de DER – mécanisme d'ajout, de retrait ou de modification des membres et/ou capacités agrégées d'un groupe de DER donné;
• suppression de groupe de DER – suppression d'un groupe entier;
• surveillance du statut d'un groupe de DER – mécanisme de quantification ou de vérification des capacités réelles et/ou du statut d'un groupe de DER;
• prévision de groupe de DER – mécanisme de prévision des capacités et/ou du statut d'un groupe de DER pour une période donnée ultérieure;
• répartition de groupe de DER – mécanisme de demande de répartition des capacités spécifiées d'un groupe de DER sur le réseau;
• contrôle du taux de rampe de tension du groupe de DER – mécanisme permettant de demander qu'un groupe de DER respecte la courbe de taux de rampe;
• branchement/débranchement du groupe de DER – mécanisme permettant de demander que les DER s'isolent elles-mêmes ou se reconnectent au réseau, en fonction des besoins.

General Information

• Status: Published
• Publication Date: 17-Aug-2020
• ICS: 01 - GENERALITIES. TERMINOLOGY. STANDARDIZATION. DOCUMENTATION
• ICS: 33.200 - Telecontrol. Telemetering
• Technical Committee: TC 57 - Power systems management and associated information exchange
• Current Stage: PPUB - Publication issued
• Completion Date: 18-Aug-2020

Standards Content (Sample)

IEC 61968-5
Edition 1.0 2020-08
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside

Application integration at electric utilities – System interfaces for distribution

management –
Part 5: Distributed energy optimization
Intégration d'applications pour les services électriques – Interfaces système
pour la gestion de distribution –
Partie 5: Optimisation de l'énergie distribuée
IEC 61968-5:2020-08(en-fr)
---------------------- Page: 1 ----------------------
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IEC 61968-5
Edition 1.0 2020-08
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside

Application integration at electric utilities – System interfaces for distribution

management –
Part 5: Distributed energy optimization
Intégration d'applications pour les services électriques – Interfaces système
pour la gestion de distribution –
Partie 5: Optimisation de l'énergie distribuée
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 33.200 ISBN 978-2-8322-8705-7

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® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale
---------------------- Page: 3 ----------------------
– 2 – IEC 61968-5:2020 © IEC 2020
CONTENTS

FOREWORD ........................................................................................................................... 5

INTRODUCTION ..................................................................................................................... 7

1 Scope .............................................................................................................................. 9

2 Normative references .................................................................................................... 10

3 Terms, definitions and abbreviated terms ...................................................................... 11

3.1 Terms and definitions ............................................................................................ 11

3.2 Abbreviated terms ................................................................................................. 11

4 Conventions .................................................................................................................. 12

4.1 UML diagrams....................................................................................................... 12

4.2 Units of measure in DER enterprise integration profiles ........................................ 12

5 DER enterprise integration use cases ............................................................................ 12

5.1 General ................................................................................................................. 12

5.2 DER Group creation .............................................................................................. 15

5.2.1 General ......................................................................................................... 15

5.2.2 Grouping requirements .................................................................................. 15

5.2.3 Challenges posed by dynamic distribution system configurations ................... 15

5.2.4 Challenges posed by enterprise information models ...................................... 17

5.2.5 Using arbitrarily-defined groups for DER aggregation .................................... 19

5.3 Maintenance of DERGroups .................................................................................. 21

5.3.1 General ......................................................................................................... 21

5.3.2 DER Group maintenance example ................................................................. 22

5.4 DER Group queries ............................................................................................... 24

5.5 DER Group status monitoring ................................................................................ 25

5.6 DER Group forecast .............................................................................................. 27

5.7 DER Group dispatch ............................................................................................. 30

5.8 DER Group Connect/Disconnect ........................................................................... 32

5.9 DER group capability discovery............................................................................. 32

5.10 DER group voltage regulation function .................................................................. 33

Annex A (normative) Data requirements for DERMS profiles ................................................ 34

A.1 General ................................................................................................................. 34

A.2 DERGroups profile (constrained version) .............................................................. 34

A.3 DERGroups profile (unconstrained version) .......................................................... 35

A.4 DERGroupDispatches profile (constrained version) ............................................... 35

A.5 DERGroupDispatches profile (unconstrained version) ........................................... 36

A.6 DERGroupForecasts (constrained) ........................................................................ 36

A.7 DERGroupForecasts (unconstrained) .................................................................... 37

A.8 DERGroupStatuses profile .................................................................................... 37

A.9 EndDeviceControls ............................................................................................... 37

A.10 DERGroupQueries ................................................................................................ 37

A.11 DERGroupStatusQueries ...................................................................................... 38

A.12 DERGroupForecastqueries ................................................................................... 38

Annex B (normative) Super classes ..................................................................................... 39

B.1 General ................................................................................................................. 39

B.2 CurveStyle class ................................................................................................... 39

B.3 DERCurveData class ............................................................................................ 39

B.4 DERFunction class ............................................................................................... 39

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IEC 61968-5:2020 © IEC 2020 – 3 –

B.5 DERMonitorableParameter class........................................................................... 40

B.6 DERNamePlate class ............................................................................................ 40

B.7 DispatchSchedule class ........................................................................................ 42

B.8 EndDevice class ................................................................................................... 42

B.9 EndDeviceGroup class .......................................................................................... 43

B.10 EndDeviceGroup (constrained) for dispatches and forecasts ................................. 43

B.11 EndDeviceGroup (unconstrained) for dispatches and forecasts ............................. 43

B.12 Names .................................................................................................................. 44

B.13 NameType ............................................................................................................ 44

B.14 NameTypeAuthority .............................................................................................. 44

B.15 Status class .......................................................................................................... 44

B.16 Version class ........................................................................................................ 45

Annex C (normative) Enumerated classes ............................................................................ 46

C.1 General ................................................................................................................. 46

C.2 abnormalOperatingPerformanceCategory enumeration class ................................ 46

C.3 DERParameterKind enumeration class ................................................................. 46

C.4 DERUnitSymbol .................................................................................................... 47

C.5 FlowDirectionKind enumeration class .................................................................... 48

C.6 normalOperatingPerformanceCategory enumeration class .................................... 48

C.7 TimeIntervalKind enumeration class ...................................................................... 48

C.8 UnitMultiplier enumeration class ........................................................................... 49

Figure 1 – Architectural options for DERMS deployments ..................................................... 13

Figure 2 – Reference architecture, IEC TR 62357‑1:2016 ..................................................... 14

Figure 3 – Example of simple radial feeder ........................................................................... 16

Figure 4 – Example of feeder with alternate substation ......................................................... 16

Figure 5 – Example of an interconnected distribution network ............................................... 17

Figure 6 – Common Information Model illustration ................................................................ 18

Figure 7 – Request/Reply message exchange pattern for the creation of a DERGroup .......... 19

Figure 8 – Notification message exchange pattern for the creation of a DERGroup ............... 20

Figure 9 – Message exchange patterns to support adding or modifying DERGroup

membership or capabilities, or deleting a group member ....................................................... 21

Figure 10 – Message exchange pattern reflecting deleting an entire DER group

(delete) ................................................................................................................................. 22

Figure 11 – Message exchange pattern to support querying a DER group ............................. 25

Figure 12 – Message exchange pattern for DER Group status monitoring (PULL) ................. 26

Figure 13 – Message exchange pattern for DER Group status monitoring (PUSH) ................ 26

Figure 14 – Example of points to represent battery storage group forecast ........................... 27

Figure 15 – Battery DER Group availability example ............................................................. 28

Figure 16 – Message exchange pattern for DER Group forecasting (PULL)........................... 29

Figure 17 – Message exchange pattern for DER Group forecasting (PUSH) .......................... 30

Figure 18 – Example Message exchange pattern for DER Group dispatch ............................ 31

Table 1 – IEC 61968-5 Profiles ............................................................................................... 9

Table 2 – IEC 61968-9 Profiles ............................................................................................. 10

Table 3 – Document overview for IEC 61968-5 ..................................................................... 10

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– 4 – IEC 61968-5:2020 © IEC 2020

Table 4 – DER Grouping functional requirements .................................................................. 15

Table 5 – Example DER Group A membership before update................................................ 22

Table 6 – Example DER Group A after adding a fourth member ............................................ 23

Table 7 – Example DER Group A membership after delete ................................................... 24

Table A.1 – IdentifiedObject .................................................................................................. 34

Table A.2 – DERGroups profile ............................................................................................. 35

Table A.3 – DERGroups (Unconstrained) Profile ................................................................... 35

Table A.4 – DERGroupDispatches (Unconstrained) Profile ................................................... 36

Table A.5 – DERGroupDispatches (unconstrained) profile .................................................... 36

Table A.6 – DERGroupForecast (constrained) profile ............................................................ 36

Table A.7 – DERGroupForecast (unconstrained) profile ........................................................ 37

Table A.8 – DERGroupStatuses profile ................................................................................. 37

Table A.9 – DERGroupQueries ............................................................................................. 38

Table A.10 – DERGroupStatusQueries ................................................................................. 38

Table A.11 – DERGroupForecastQueries .............................................................................. 38

Table B.1 – CurveStyle class ................................................................................................ 39

Table B.2 – DERCurveData class ......................................................................................... 39

Table B.3 – DERFunction class ............................................................................................. 40

Table B.4 – DERMonitorableParameter class ........................................................................ 40

Table B.5 – DERNamePlate .................................................................................................. 41

Table B.6 – DispatchSchedule .............................................................................................. 42

Table B.7 – EndDevice ......................................................................................................... 43

Table B.8 – EndDeviceGroup class ....................................................................................... 43

Table B.9 – EndDeviceGroup (constrained) dispatches class ................................................ 43

Table B.10 – EndDeviceGroup (unconstrained) for dispatches and forecasts ........................ 43

Table B.11 – Names ............................................................................................................. 44

Table B.12 – NameType ....................................................................................................... 44

Table B.13 – NameTypeAuthority .......................................................................................... 44

Table B.14 – Status class ..................................................................................................... 44

Table B.15 – Version class ................................................................................................... 45

Table C.1 – abnormalOperatingPerformanceCategory .......................................................... 46

Table C.2 – DERParameterKind ............................................................................................ 46

Table C.3 – DERUnitSymbol ................................................................................................. 47

Table C.4 – FlowDirectionKind .............................................................................................. 48

Table C.5 – normalOperatingPerformanceCategory .............................................................. 48

Table C.6 – TimeIntervalKind ................................................................................................ 49

Table C.7 – UnitMultiplier...................................................................................................... 49

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IEC 61968-5:2020 © IEC 2020 – 5 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
APPLICATION INTEGRATION AT ELECTRIC UTILITIES –
SYSTEM INTERFACES FOR DISTRIBUTION MANAGEMENT –
Part 5: Distributed energy optimization
FOREWORD

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International Standard IEC 61968-5 has been prepared by IEC technical committee 57: Power

systems management and associated information exchange.
The text of this International Standard is based on the following documents:
FDIS Report on voting
57/2223/FDIS 57/2252/RVD

Full information on the voting for the approval of this International Standard can be found in the

report on voting indicated in the above table.

This document has been drafted in accordance with the ISO/IEC Directives, Part 2.

A list of all parts in the IEC 61968 series, published under the general title Application

integration at electric utilities – System interfaces for distribution management, can be found

on the IEC website.
---------------------- Page: 7 ----------------------
– 6 – IEC 61968-5:2020 © IEC 2020

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---------------------- Page: 8 ----------------------
IEC 61968-5:2020 © IEC 2020 – 7 –
INTRODUCTION

Technology advancements in various types of distributed energy resources (DER), have driven

increases in their evaluation and employment by utilities, consumers, and third parties. These

DER are often connected to the grid at the distribution level where their presence in large scale

or volume could be disruptive if not designed, integrated, and managed properly.

Inverters, the power converter circuits that integrate DER to the grid, are highly-capable devices

with fast power controls and no inherent inertia such that they can respond quickly to commands

and local conditions. Even small-scale inverters tend to have processing and memory resources

and can support a variety of communication protocols and advanced functions. Over the last

few years, industry efforts have defined a wide range of standard grid-supportive functions that

inverters may provide and standard communication protocols that allow these functions to be

remotely monitored and managed.

If these inverter capabilities can be properly exposed and integrated into traditional utility

system operations, high penetration DER can be transformed from problematic uncertainties to

beneficial tools for distribution management. To achieve these potential benefits, it needs to be

possible not just to communicate to individual DER devices using standard protocols, but also

for the systems that manage DER, referred to herein as DER Management System or "DERMS",

to effectively inform other software applications regarding the resources available and to

exchange information that allows the DER to be managed effectively. Additionally, due to scale

of some devices, to optimize the management of DER they are managed in aggregate, referred

hereafter as "DER group management".

Traditionally, distribution systems have been operated without extensive controls or centralized

management. More advanced systems may have On-Load Tap Changing transformers (LTCs)

at substations, line regulators, and/or capacitor banks that operate to help optimize distribution

voltage and reactive power flow. In many cases, these devices may be fixed or configured to

operate autonomously. In a growing number of cases, however, a more central Distribution

Management System (DMS) has been used to coordinate their behaviour for a more optimized

overall effect. DMS functionality may reside at the utility operations centre, where single, large-

scale software manages many circuits, or it may reside in a more limited fashion at the

substation or other level, where smaller-scale systems act to manage individual feeders or

circuits.

Regardless of the scenario, the present generation of DMS systems is not designed to take

advantage of the capabilities that DER may offer. In most cases, DER support within a DMS is

limited to monitoring the output of "utility scale" DERs (> one megawatt). In addition, existing

industry standards define advanced functions for DER only at the individual device level, and

lack the more aggregated, feeder-level representations that are useful for enterprise integration.

This document develops appropriate enterprise-level functions for the integration of distributed

energy resources. These functions are intended to work in conjunction with the common

functions for smart inverters that have previously been defined.
The high-level use cases that are covered include management of DER gro
...