IEC TS 62898-1:2017/AMD1:2023

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

Amendement 1 -

General Information

• Status: Published
• Publication Date: 29-Aug-2023
• 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: 30-Aug-2023
• Completion Date: 01-Sep-2023

Relations

• Amends: IEC TS 62898-1:2017 - Microgrids - Part 1: Guidelines for microgrid projects planning and specification
• Effective Date: 05-Sep-2023

Overview

IEC TS 62898-1:2017/AMD1:2023 is Amendment 1 to the IEC Technical Specification that provides updated guidelines for microgrid projects planning and specification. The amendment refines definitions (e.g., microgrid, island, isolated microgrid, DER), clarifies earthing/grounding terminology, links Part 1 to other IEC TS parts for operation, protection and EMS, and adds technical and economic content to support project evaluation and lifecycle assessment.

Key topics and requirements

• Definitions and terminology updates: Revised, harmonized terms for microgrid, island, isolated microgrid, distributed energy resources (DER), earth/earthing conductor/arrangement, and EMC to ensure consistent usage across microgrid documents.
• Scope alignment with related parts: Explicit cross-references to IEC TS 62898‑2 and IEC TS 62898‑3-x (operation & control, protection/dynamic control, energy management, self-regulation loads, monitoring & control).
• Control, protection and communications: Editorial and technical clarifications (e.g., protection relay wording, load-shedding references) to reinforce system reliability and protection design.
• Energy economics and project evaluation:
  • Net Present Value (NPV) inclusion with formula for discounted cash-flow analysis.
  • Simplified cost models for generation (fixed + variable cost equations) and storage levelized cost discussions.
  • Annex E: informative background on cost calculation methods and storage assessment (power vs energy, storage time constant H = E/P).
• Life-cycle energetic metrics:
  • Introduction of EROI (Energy Return on Energy Invested) for generation lifecycle evaluation.
  • ESOI (Energy Stored on Energy Invested) for storage systems with example parameters (cycle life, round-trip efficiency, depth of discharge).
• Business use cases: Updates to annexes covering continuity of service (islanding), local resource optimization, rural electrification with renewables, and grid services/disaster preparedness.

Practical applications

• Use this amendment when preparing microgrid project specifications, feasibility studies, tender documents, and technical design reports.
• Supports decisions on earthing/grounding design, protection schemes, control/communication architecture, energy storage sizing, and economic viability.
• Valuable for projects in isolated/rural electrification, utilities planning embedded microgrids, campus/facility microgrids, and disaster-resilient energy systems.

Who should use it

• Microgrid planners, system and protection engineers, energy consultants, project developers, regulatory authorities, equipment manufacturers, and researchers involved in microgrid design, procurement and lifecycle assessment.

Related standards

• IEC TS 62898‑2 (operation and control)
• IEC TS 62898‑3‑1 to ‑3‑4 (protection, EMS, self‑regulation loads, monitoring & control)
• IEC 60050 series (vocabulary sources referenced in definitions)

Keywords: IEC TS 62898-1, microgrids, amendment 1, guidelines, planning and specification, energy storage, DER, protection, NPV, EROI, ESOI.

Standards Content (Sample)

IEC TS 62898-1 ®
Edition 1.0 2023-08
TECHNICAL
SPECIFICATION
colour
inside
AMENDMENT 1
Microgrids –
Part 1: Guidelines for microgrid projects planning and specification

IEC TS 62898-1:2017-05/AMD1:2023-08(en)

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IEC TS 62898-1 ®
Edition 1.0 2023-08
TECHNICAL
SPECIFICATION
colour
inside
AMENDMENT 1
Microgrids –
Part 1: Guidelines for microgrid projects planning and specification

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 29.240.01  ISBN 978-2-8322-7435-4

– 2 – IEC TS 62898-1:2017/AMD1:2023
© IEC 2023
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
MICROGRIDS –
Part 1: Guidelines for microgrid projects planning and specification

AMENDMENT 1
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
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9) Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. IEC shall not be held responsible for identifying any or all such patent rights.
Amendment 1 to IEC 62898-1:2017 has been prepared by subcommittee 8B: Decentralized
electrical energy systems, of IEC technical committee 8: System aspects of electrical energy
supply.
The text of this Amendment is based on the following documents:
Draft Report on voting
8B/165/DTS 8B/179/RVDTS
Full information on the voting for its approval can be found in the report on voting indicated in
the above table.
The language used for the development of this Amendment is English.

© IEC 2023
This document was drafted in accordance with ISO/IEC Directives, Part 2, and developed in
accordance with ISO/IEC Directives, Part 1 and ISO/IEC Directives, IEC Supplement, available
at www.iec.ch/members_experts/refdocs. The main document types developed by IEC are
described in greater detail at www.iec.ch/publications/.
A list of all parts in the IEC 62898 series, published under the general title Microgrids, can be
found on the IEC website.
The committee has decided that the contents of this document will remain unchanged until the
stability date indicated on the IEC website under webstore.iec.ch in the data related to the
specific document. At this date, the document will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
IMPORTANT – The "colour inside" logo on the cover page of this document indicates that it
contains colours which are considered to be useful for the correct understanding of its
contents. Users should therefore print this document using a colour printer.

___________
INTRODUCTION
Replace the second paragraph, beginning with "This part of IEC 62898 defines the guidelines
for the general planning and design of microgrids"with the following new text.
This part of IEC 62898 defines the guidelines for the general planning and design of microgrids,
IEC TS 62898-2 defines the general technical requirements for operation and control of
microgrids, IEC TS 62898-3-1 defines the technical requirements for protection and dynamic
control of microgrids, IEC TS 62898-3-2 defines the technical requirements for energy
management systems of microgrids, IEC TS 62898-3-3 defines the technical requirements for
self-regulation loads of microgrids, and IEC TS 62898-3-4 defines the technical requirements
for microgrid monitoring and control systems. IEC TC8/SC8B/JWG1 is responsible for the
development of these TS.
3 Terms and definitions
3.5
earth
ground
Replace the existing definition and source with the following:
part of the earth that is in electric contact with an earth electrode and that has an electric
potential not necessarily equal to zero
[SOURCE: IEC 60050-195:2021, 195-01-03, modified – The adjective "local" has been removed
from the term.]
– 4 – IEC TS 62898-1:2017/AMD1:2023
© IEC 2023
3.6
earthing arrangement
grounding arrangement
Replace the existing definition and source with the following:
all electrical means involved in the earthing of a system, installation or equipment
Note 1 to entry: Electric connection and devices used for earthing are examples of electrical means.
[SOURCE: IEC 60050-195:2021, 195-02-20]
3.7
earthing conductor
grounding conductor
Replace the existing definition and source with the following:
conductor forming a conductive path between a conductive part and an earth electrode
[SOURCE: IEC 60050-195:2021, 195-02-03]
3.8
electromagnetic compatibility
EMC
Replace the existing source with the following:
[SOURCE: IEC 60050-161:2018, 161-01-07]
3.9
distributed energy resources
DER
Replace the existing definition with the following:
generators (with their auxiliaries, protection and connection equipment), including loads having
a generating mode (such as electrical energy storage systems), connected to a low-voltage or
a medium-voltage network
[SOURCE: IEC 60050-617:2017, 617-04-20]

3.15
island
Replace the existing definition and source with the following.

part of an electric power system that is electrically disconnected from the remainder of the
interconnected electric power system but remains energized from local electric power sources
Note 1 to entry: An electric island can be either the result of the action of automatic protections or the result of a
deliberate action.
Note 2 to entry: An electric island can be stable or unstable.
Note 3 to entry: Inside the electric island, generators and loads can be any combination of customer-owned and
utility-owned units.
[SOURCE: IEC 60050-692:2017, 692-02-11, modified – The term "electric" has been removed
from the term., Note 3 to entry has been added.]

© IEC 2023
3.16
isolated microgrid
Replace the existing definition with the following:
group of interconnected loads and distributed energy resources with defined electrical
boundaries forming a local electric power system at distribution voltage levels, that cannot be
connected to a wider electric power system
Note 1 to entry: Isolated microgrids are usually designed for geographical islands or for rural electrification.
Note 2 to entry: A microgrid capable of being connected to a wider electric power system is also called non-isolated
microgrid or embedded microgrid.
[SOURCE: IEC 60050-617:2017, 617-04-23, modified – Note 2 to entry has been added.]
3.22
microgrid
Replace the existing definition and notes to entry with the following:
group of interconnected loads and distributed energy resources
with defined electrical boundaries forming a local electric power system at distribution voltage
levels, that acts as a single controllable entity and is able to operate in island mode
Note 1 to entry: This definition covers both (utility) distribution microgrids and (customer owned) facility microgrids.
[SOURCE: IEC 60050-617:2017, 617-04-22]

5 Purpose and application of microgrids
5.2 Application of non-iso
...