IEC TS 62898-1:2017

Microgrids - Part 1: Guidelines for microgrid projects planning and specification

IEC TS 62898-1:2017(E) provides guidelines for microgrid projects planning and specification. Microgrids considered in this document are alternating current (AC) electrical systems with loads and distributed energy resources (DER) at low or medium voltage level. This document does not cover direct current (DC) microgrids.
Microgrids are classified into isolated microgrids and non-isolated microgrids. Isolated microgrids have no electrical connection to a wider electric power system. Non-isolated microgrids can act as controllable units to the electric power system and can operate in the following two modes:
- grid-connected mode;
- island mode.
This document will cover the following areas:
- microgrid application, resource analysis, generation forecast, and load forecast;
- DER planning and microgrid power system planning;
- high level technical requirements for DER in microgrids, for microgrid connection to the distribution system, and for control, protection and communication systems;
- evaluation of microgrid projects.

General Information

• Status: Published
• Publication Date: 29-Aug-2023
• ICS: 01 - GENERALITIES. TERMINOLOGY. STANDARDIZATION. DOCUMENTATION
• ICS: 29.240.01 - Power transmission and distribution networks in general
• Technical Committee: SC 8B - Decentralized electrical energy systems
• Drafting Committee: JWG 1 - TC 8/SC 8B/JWG 1
• Current Stage: PPUB - Publication issued
• Start Date: 19-Jun-2017
• Completion Date: 18-May-2017

Relations

• Amended By: IEC TS 62898-1:2017/AMD1:2023 - Amendment 1 - Microgrids - Part 1: Guidelines for microgrid projects planning and specification
• Effective Date: 05-Sep-2023

Standards Content (Sample)

IEC TS 62898-1 ®
Edition 1.0 2017-05
TECHNICAL
SPECIFICATION
colour
inside
Microgrids –
Part 1: Guidelines for microgrid projects planning and specification
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form
or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from
either IEC or IEC's member National Committee in the country of the requester. If you have any questions about IEC
copyright or have an enquiry about obtaining additional rights to this publication, please contact the address below or
your local IEC member National Committee for further information.

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3, rue de Varembé Fax: [phone]
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The International Electrotechnical Commission (IEC) is the leading global organization that prepares and publishes
International Standards for all electrical, electronic and related technologies.

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IEC TS 62898-1 ®
Edition 1.0 2017-05
TECHNICAL
SPECIFICATION
colour
inside
Microgrids –
Part 1: Guidelines for microgrid projects planning and specification

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 29.240.01 ISBN 978-2-8322-4360-2

– 2 – IEC TS 62898-1:2017 © IEC 2017
CONTENTS
FOREWORD . 5
INTRODUCTION . 7
1 Scope . 8
2 Normative references . 8
3 Terms and definitions . 8
4 General principles . 13
4.1 General . 13
4.2 Preliminary study . 14
4.3 Overall microgrid planning and design process . 14
5 Purpose and application of microgrids . 15
5.1 Application classification . 15
5.2 Application of non-isolated microgrids . 15
5.3 Application of isolated microgrids . 15
6 Resource analysis and generation forecast . 16
6.1 Resource analysis. 16
6.1.1 General . 16
6.1.2 Non-dispatchable resource analysis . 16
6.1.3 Dispatchable resource analysis . 17
6.2 Generation forecast . 17
6.2.1 General . 17
6.2.2 Technical requirements . 17
6.2.3 Data processing . 18
7 Load forecast . 18
7.1 General . 18
7.2 Load analysis . 18
7.3 Classification of load forecast . 19
7.4 Technical requirements . 19
8 Distributed energy resource planning . 20
8.1 Ratio of renewable energy . 20
8.2 Renewable generation configuration . 20
8.3 Energy storage . 20
8.4 Electric power and energy balancing . 20
8.5 Dispatchable generation configuration . 20
9 Microgrid power system planning . 21
9.1 Voltage level . 21
9.2 Typical topology of a microgrid . 21
9.2.1 Typical topology for a non-isolated microgrid . 21
9.2.2 Typical topology for an isolated microgrid . 23
9.3 Electrical parameter calculations. 23
10 Technical requirements for DER in microgrids . 23
10.1 General . 23
10.2 Technical requirements for DER in grid-connected mode . 24
10.3 Technical requirements for DER in isolated microgrids and island mode of
non-isolated microgrids . 24
11 Technical requirements for distribution lines in microgrids . 24
12 Technical requirements for microgrid connection to distribution networks . 24

12.1 General . 24
12.2 Interface protection . 24
12.3 Microgrid earthing . 25
12.3.1 General . 25
12.3.2 Technical requirements for microgrid earthing . 25
12.4 Power quality at POC . 25
12.4.1 General . 25
12.4.2 Power quality monitoring . 25
13 Technical requirements for control, protection and communication systems . 26
13.1 Microgrid control . 26
13.1.1 General . 26
13.1.2 Control scheme . 26
13.2 Protection relays and automatic protection devices . 26
13.2.1 General . 26
13.2.2 DER component protection . 27
13.2.3 Component protection for all users in a microgrid . 27
13.2.4 Load shedding in a microgrid . 27
13.3 Microgrid communication . 27
13.3.1 Communication within microgrid subsystem . 27
13.3.2 Microgrid communication with connected distribution system . 27
13.4 Information exchange. 27
14 Evaluation of microgrid projects . 28
14.1 General . 28
14.2 Reliability of power supply . 28
14.3 Economic benefits. 28
14.4 Environmental benefits . 28
14.5 Scalability . 28
14.6 Integration to the wider electric power system . 28
Annex A (informative) Business use case A Guarantee a continuity in load service by
islanding with microgrids . 29
A.1 General . 29
A.2 Purpose . 29
A.3 Objectives . 29
Annex B (informative) Business use case B Optimize local resources to provide
services to customers inside the microgrid . 30
B.1 General . 30
B.2 Purpose . 30
B.3 Objectives . 30
Annex C (informative) Business use case C Electrify remote areas using renewable
energy sources . 31
C.1 General . 31
C.2 Purpose . 31
C.3 Objectives . 31
C.4 Basic functions . 31
C.5 Advanced functions . 31
Annex D (informative) Business use case D Optimize local resources to provide
services to the grid/disaster preparedness . 32
D.1 General . 32
D.2 Scope .
...

IEC TS 62898-1 ®
Edition 1.1 2023-08
CONSOLIDATED VERSION
TECHNICAL
SPECIFICATION
colour
inside
Microgrids –
Part 1: Guidelines for microgrid projects planning and specification

All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form
or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from
either IEC or IEC's member National Committee in the country of the requester. If you have any questions about IEC
copyright or have an enquiry about obtaining additional rights to this publication, please contact the address below or
your local IEC member National Committee for further information.

IEC Secretariat Tel.: [phone]
3, rue de Varembé [e-mail]
CH-1211 Geneva 20 www.iec.ch
Switzerland
About the IEC
The International Electrotechnical Commission (IEC) is the leading global organization that prepares and publishes
International Standards for all electrical, electronic and related technologies.

About IEC publications
The technical content of IEC publications is kept under constant review by the IEC. Please make sure that you have the
latest edition, a corrigendum or an amendment might have been published.

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further assistance, please contact the Customer Service
Centre: [e-mail].
IEC TS 62898-1 ®
Edition 1.1 2023-08
CONSOLIDATED VERSION
TECHNICAL
SPECIFICATION
colour
inside
Microgrids –
Part 1: Guidelines for microgrid projects planning and specification
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 29.240.01 ISBN 978-2-8322-7473-6

IEC TS 62898-1 ®
Edition 1.1 2023-08
CONSOLIDATED VERSION
REDLINE VERSION
colour
inside
Microgrids –
Part 1: Guidelines for microgrid projects planning and specification

– 2 – IEC TS 62898-1:2017+AMD1:2023 CSV
© IEC 2023
CONTENTS
FOREWORD . 5
INTRODUCTION . 7
1 Scope . 8
2 Normative references . 8
3 Terms and definitions . 8
4 General principles . 13
4.1 General . 13
4.2 Preliminary study . 14
4.3 Overall microgrid planning and design process . 14
5 Purpose and application of microgrids . 15
5.1 Application classification . 15
5.2 Application of non-isolated microgrids . 16
5.3 Application of isolated microgrids . 16
6 Resource analysis and generation forecast . 16
6.1 Resource analysis. 16
6.1.1 General . 16
6.1.2 Non-dispatchable resource analysis . 17
6.1.3 Dispatchable resource analysis . 17
6.2 Generation forecast . 17
6.2.1 General . 17
6.2.2 Technical requirements . 18
6.2.3 Data processing . 18
7 Load forecast . 19
7.1 General . 19
7.2 Load analysis . 19
7.3 Classification of load forecast . 19
7.4 Technical requirements . 20
8 Distributed energy resource planning . 20
8.1 Ratio of renewable energy . 20
8.2 Renewable generation configuration . 20
8.3 Energy storage . 20
8.4 Electric power and energy balancing . 21
8.5 Dispatchable generation configuration . 21
9 Microgrid power system planning . 21
9.1 Voltage level . 21
9.2 Typical topology of a microgrid . 21
9.2.1 Typical topology for a non-isolated microgrid . 21
9.2.2 Typical topology for an isolated microgrid . 23
9.3 Electrical parameter calculations. 23
10 Technical requirements for DER in microgrids . 24
10.1 General . 24
10.2 Technical requirements for DER in grid-connected mode . 24
10.3 Technical requirements for DER in isolated microgrids and island mode of
non-isolated microgrids . 24
11 Technical requirements for distribution lines in microgrids . 25
12 Technical requirements for microgrid connection to distribution networks . 25

© IEC 2023
12.1 General . 25
12.2 Interface protection . 25
12.3 Microgrid earthing . 25
12.3.1 General . 25
12.3.2 Technical requirements for microgrid earthing . 25
12.4 Power quality at POC . 26
12.4.1 General . 26
12.4.2 Power quality monitoring . 26
13 Technical requirements for control, protection and communication systems . 26
13.1 Microgrid control . 26
13.1.1 General . 26
13.1.2 Control scheme . 26
13.2 Protection relays and automatic protection devices . 27
13.2.1 General . 27
13.2.2 DER component protection . 27
13.2.3 Component protection for all users in a microgrid . 27
13.2.4 Load shedding in a microgrid . 27
13.3 Microgrid communication . 28
13.3.1 Communication within microgrid subsystem . 28
13.3.2 Microgrid communication with connected distribution system . 28
13.4 Information exchange. 28
14 Evaluation of microgrid projects . 28
14.1 General . 28
14.2 Reliability of power supply . 28
14.3 Economic benefits. 29
14.4 Environmental benefits . 30
14.5 Scalability . 30
14.6 Integration to the wider electric power system . 30
14.7 Life-time energy balance of resources. 30
Annex A (informative) Business use case A Guarantee a continuity in load service by
islanding with microgrids . 31
A.1 General . 31
A.2 Purpose . 31
A.3 Objectives . 31
Annex B (informative) Business use case B Optimize local resources to provide

services to customers inside the microgrid . 32
B.1 General . 32
B.2 Purpose . 32
B.3 Objectives . 32
Annex C (informative) Business use case C Electrify remote areas using renewable
energy sources . 33
C.1 General . 33
C.2 Purpose . 33
C.3 Objectives . 33
C.4 Basic functions . 33
C.5 Advanced functions . 33
Annex D (informative) Business use case D Optimize local resources to provide
services to the grid/disaster preparedness . 34
D.1 General .
...