IEC TR 62898-4:2023

Microgrids - Part 4: Use cases

IEC TR 62898-4:2023 which is a technical report, provides a set of use cases related to microgrids, as a form of "decentralized energy system". Decentralized energy systems are small energy systems containing loads and distributed energy resources (generation, storage) with decentralized management for energy supply. This document completes the SC 8B roadmap for decentralized electrical energy systems. The goal is to explain the methodology retained on the microgrid sub-domain, which is a kind of decentralized system. This methodology, based on IEC 62913-1, describes high-level use cases (business use cases) covering the main typical usage of microgrids, and details some of them through system use cases. The proposed list of use cases is a first version, proposed for review; the goal is to cover all use cases with the same level of depth.

General Information

• Status: Published
• Publication Date: 03-Apr-2023
• ICS: 29.240.01 - Power transmission and distribution networks in general
• Technical Committee: SC 8B - Decentralized electrical energy systems
• Current Stage: PPUB - Publication issued
• Start Date: 12-Apr-2023
• Completion Date: 04-Apr-2023

Standards Content (Sample)

IEC TR 62898-4 ®
Edition 1.0 2023-04
TECHNICAL
REPORT
colour
inside
Microgrids –
Part 4: Use cases
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IEC TR 62898-4 ®
Edition 1.0 2023-04
TECHNICAL
REPORT
colour
inside
Microgrids –
Part 4: Use cases
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 29.240.01 ISBN 978-2-8322-6645-8

– 2 – IEC TR 62898-4:2023 © IEC 2023
CONTENTS
FOREWORD . 5
INTRODUCTION . 7
1 Scope . 8
2 Normative references . 8
3 Terms, definitions, and abbreviated terms . 8
3.1 Terms and definitions . 8
3.2 Abbreviated terms . 11
4 Overview of the document . 12
5 Role model associated to decentralized electrical energy systems. 12
5.1 Role model based on SGAM . 12
5.2 Business roles . 13
5.3 System roles . 15
5.4 Clarifications on some roles and further detailing concepts . 20
6 Microgrids use cases . 22
6.1 General . 22
6.2 List of business use cases identified . 22
6.3 Use case methodology applied to microgrid domain . 23
6.4 Guarantee a continuity in load service by islanding (BUC A) . 25
6.4.1 General . 25
6.4.2 Scope . 25
6.4.3 Objectives . 25
6.4.4 Operation of use case and technical issues . 26
6.5 Electrify areas using renewable energy resources (BUC B) . 29
6.5.1 General . 29
6.5.2 Scope . 29
6.5.3 Objectives . 29
6.5.4 Operation of use case and technical issues . 29
6.6 Optimize local resources to provide services to customers inside the
microgrid (BUC C) . 30
6.6.1 Scope . 30
6.6.2 Objectives . 30
6.6.3 Operation and related technical issues . 31
6.7 Optimize local resources to provide services to the area EPS for disaster
preparedness and power quality (BUC D) . 33
6.7.1 Scope . 33
6.7.2 Objectives . 33
6.7.3 Operation of use case and technical issues . 34
6.8 Develop larger energy systems by interconnection of isolated microgrids
(BUC E) . 34
6.8.1 Scope . 34
6.8.2 Objectives . 34
6.8.3 Operation of use case and technical issues . 35
6.9 Optimize energy supply cost and exploitation of local assets inside
community-run distribution utility by managing local resources (BUC F) . 36
6.9.1 Scope . 36
6.9.2 Objectives . 37
6.9.3 Operation and related technical issues . 37

6.10 List of system use cases . 40
7 Coordination with other IEC Standards . 47
7.1 Links with IEC 61968-1 . 47
7.2 Links with IEC 61968-5 . 49
7.3 Links with IEC TR 61850-90-23 . 51
7.4 Links with the IEC 62898 series . 53
7.4.1 General . 53
7.4.2 Links with IEC TS 62898-1 . 53
7.4.3 Links with IEC TS 62898-2 . 53
7.4.4 Links with IEC TS 62898-3 series . 54
7.5 VPP related standards . 56
7.6 Prosumer electrical installations . 58
8 Perspectives . 59
Annex A (informative) Business use case A, Guarantee a continuity in load service by
islanding the microgrid, in IEC 62559-2 template . 60
Annex B (informative) UML microgrid use case repository. 64
Bibliography . 65

Figure 1 – The Smart Grid Architecture Model (CEN-CENELEC-ETSI, 2014) . 13
Figure 2 – Schematic view of the different types of electric power systems . 21
Figure 3 – Graphic user guide for DER related terms and concepts . 22
Figure 4 – Schematic vision of the microgrids business use cases . 23
Figure 5 – Process for SUC edition for each BUC . 25
Figure 6 – Illustration of a microgrid for electrifying remote areas using renewable
energy resources . 30
Figure 7 – Representation of the power regulation and control of a microgrid . 33
Figure 8 – Illustration of an area with microgrids and local energy supply systems

without interconnection . 35
Figure 9 – Illustration of the connection between microgrids and local energy supply
systems of an area . 36
Figure 10 – Customer regulation and EMS connection options . 40
Figure 11 – Interface Reference Model (IEC 61968-1) . 48
Figure 12 – Architectural options for DERMS deployment (from IEC 61968-5) . 49
Figure 13 – Request-and-reply message exchange pattern for the creation of a DER
Group (from IEC 61968-5). 50
Figure 14 – Notification message exchange pattern for the creation of a DER Group
(from IEC 61968-5) . 51
Figure 15 – First set of sub-roles attached to a DER (microgrid) deduced from
IEC 61850-7-420 . 52
Figure 16 – Current role transpositions into LNs according to IEC 61850-7-420 . 53
Figure 17 – Function mapping among subparts in the IEC TS 62898-3 series . 54
Figure 18 – VPP composition diagram . 56
Figure 19 – Centralized control mode architecture . 57
Figure 20 – Decentralized control mode architecture. 57
Figure 21 – Example of prosumer’s low-voltage electrical installation . 58
Figure B.1 – UML microgrid use case repository . 64
Figure B.2 – System use case illustration . 64

– 4 – IEC TR 62898-4:2023 © IEC 2023
Table 1 – Business roles of the domain . 13
Table 2 – System roles of the domain . 16
Table 3 – List of microgrids system use cases . 41

INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
MICROGRIDS –
Part 4: Use cases
FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of IEC is to promote international
co-operation on all questions concerning standardization in the electrical and electronic fields. To this end and
in addition to other activities, I
...