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: 04-Apr-2023
• Completion Date: 12-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
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IEC TR 62898-4 has been prepared by subcommittee SC 8B: Decentralized electrical energy
systems, of IEC technical committee 8: System aspects of electrical energy supply. It is a
Technical Report.
The text of this Technical Report is based on the following documents:
Draft Report on voting
8B/120/DTR 8B/142/RVDTR
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 Technical Report is English.

– 6 – IEC TR 62898-4:2023 © 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/standardsdev/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 "http://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
This document 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.

– 8 – IEC TR 62898-4:2023 © IEC 2023
MICROGRIDS –
Part 4: Use cases
1 Scope
In line with the methodology specified in IEC SRD 62913-1, this document describes business
use cases (high-level use cases covering the main typical usage of microgrids) and details
some of them. System use cases linked to those business use cases are listed and briefly
described for contextualizing the main functions to be performed for managing microgrids.
Ultimately, the goal of this document is to provide a consistent level of detail for all business
use cases. The document details the methodology retained to develop system use cases from
the business use cases.
2 Normative references
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.
IEC SRD 62913-1, Generic smart grid requirements – Part 1: Specific application of the Use
case methodology for defining generic smart grid requirements according to the IEC systems
approach
3 Terms, definitions, and abbreviated terms
3.1 Terms and definitions
For the purposes of this document, the terms and definitions given in IEC SRD 62913-1 and the
following apply.
ISO and IEC maintain terminological databases for use in standardization at the following
addresses:
• IEC Electropedia: available at http://www.electropedia.org/
• ISO Online browsing platform: available at http://www.iso.org/obp
3.1.1
black start
start-up of an electric power system from a blackout through internal energy resources
[SOURCE: IEC 60050-617:2017, 617-04-24]
3.1.2
distributed energy resources
DER
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]

3.1.3
distributed energy resource management system
DERMS
system which, on behalf of other interested systems, manages the communications and control
of individual distributed energy resources (DER), and can do this with a variety of field message
protocols, and aggregates this information and communicates with other utility systems, such
as a distribution management system (DMS)
3.1.4
distributed generation
DG
generation of electric energy by multiple sources which are connected to the power distribution
system
[SOURCE: IEC 60050-617:2009, 617-04-09, modified – The preferred terms "embedded
generation" and "dispersed generation" have been omitted.]
3.1.5
distribution management system
DMS
integration of business processes, hardware, software, and telecommunications equipment that
provide effective tools to manage the operational business processes related to network
management, outage management, power quality and other supporting operational practices
[SOURCE: IEC TS 61968-2:2011, 2.88]
3.1.6
electrical energy management system
EEMS
system monitoring, operating, controlling and managing energy resources and loads of the
installations
Note 1 to entry: This equipment can be stand-alone or integrated in other larger equipment such as a home and
building electronic system.
[SOURCE: IEC 60364-8-1:2019, 3.2.1, modified – Note 1 to entry has been added.]
3.1.7
electrical energy storage
EES
installation able to absorb electrical energy, to store it for a certain amount of time and to
release electrical energy during which energy conversion processes can be included
EXAMPLE A device that absorbs AC electrical energy to produce hydrogen by electrolysis, stores the hydrogen,
and uses that gas to produce AC electrical energy is an electrical energy storage.
Note 1 to entry: The term "electrical energy storage" may also be used to indicate the activity that an apparatus,
described in the definition, carries out when performing its own functionality.
Note 2 to entry: The term "electrical energy storage" should not be used to designate a grid-connected installation;
electrical energy storage system (3.1.8) is the appropriate term.

– 10 – IEC TR 62898-4:2023 © IEC 2023
3.1.8
electrical energy storage system
EES system
EESS
installation with defined electrical boundaries, comprising at least one electrical energy storage,
which extracts electrical energy from an electric power system, stores this energy internally in
some manner and injects electrical energy into an electric power system and which includes
civil engineering works, energy conversion equipment and related ancillary equipment
Note 1 to entry: The EES system is controlled and coordinated to provide services to the electric power system
operators or to the electric power system users.
Note 2 to entry: In some cases, an EES system may require an additional energy source (non-electrical) during its
discharge, providing more energy to the electric power system than the energy it stored. Compressed air energy
storage is a typical example where additional thermal energy is required.
3.1.9
electric power system
EPS
composite, comprised of one or more generating sources, and connecting transmission and
distribution facilities, operated to supply electric energy
Note 1 to entry: A specific electric power system includes all installations and plant, within defined bounds, provided
for the purpose of generating, transmitting and distributing electric energy.
[SOURCE: IEC 60050-692:2017, 692-01-02]
3.1.10
isolated microgrid
group of interconnected loads and distributed energy resources forming a local electric power
system at distribution voltage levels not currently capable of being 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: The definition includes a modification with respect to the IEV 617-04-23 to consider the fact that in
the future, an isolated microgrid may be connected to an electric power system thanks to grid extension (this feature
is explored further in this document).
[SOURCE: IEC 60050-617:2017, 617-04-23:2017, modified – In the definition, "with defined
electrical boundaries" has been deleted, and "that cannot be connected" has been replaced
with "not currently capable of being connected".]
3.1.11
microgrid
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 either grid-connected or 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]
3.1.12
prosumer’s electrical installation
PEI
electrical installation connected to a public distribution network or not able to operate with one
or both of local power supplies and local storage units, and that monitors and controls the
energy from the connected sources delivering it to one or more of loads, local storage units,
and public distribution network

3.1.13
virtual power plant
VPP
group of distributed energy resources which combine to function as a dispatchable unit
Note 1 to entry: A virtual power plant can be used for the purpose of participating in the electricity market or
aggregating ancillary services.
[SOURCE: IEC 60050-617:2017, 617-04-27]
3.2 Abbreviated terms
BUC business use cases
CIM common information model
DC direct current
DER distributed energy resource(s)
DERMS distributed energy resources management system
DG distributed generation
DMS distribution management system
DSO distribution system operator
EEMS electrical energy management system
EES energy storage system
EESS electrical energy storage system
EMS energy management system
EV electric vehicle
EPS electric power system
FACTS flexible alternating current transmission system
HV high voltage
HVDC high voltage direct current
IEC International Electrotechnical Commission
LV low voltage
MV medium voltage
POC point of connection
PEI prosumer’s electrical installation
PQ power quality
REP retail energy provider
SCADA supervisory control and data acquisition
SMU system management unit
SUC system use cases
SyC system committee
TSO transmission system operator
Unified Modeling Language™
UML®
VPP virtual power plant
___________
UML® and Unified Modeling Language™ are trademarks of The Object Management Group. This information is
given for the convenience of users of this document and does not constitute an endorsement by IEC of the product
named.
– 12 – IEC TR 62898-4:2023 © IEC 2023
4 Overview of the document
In line with the methodology specified in IEC SRD 62913-1, this document describes business
use cases (high-level use cases covering the main typical usage of microgrids) and details
some of them.
Like any business use cases, these use cases attempt to be agnostic from any solutions or
systems used for supporting the implementation of these use cases.
System use cases linked to those business use cases are listed for contextualizing the main
functions to be performed for managing microgrids. For each of these, a short description and
the involved system roles are listed with the intent to lay out technical requirements for further
analysis. In the current document, not all the business use cases are covered in detail.
Ultimately, the goal of the document is to provide a consistent level of detail for all business
use cases. The document details the methodology selected to develop system use cases from
the business use cases.
This work feeds the setting up of the standardization roadmap for decentralized energy systems,
in the specific case of microgrids.
This means that this work will be followed by three next steps.
• Derive from these use cases some high-level objects to be standardized to ensure the
implementation of a standard based solution for microgrids.
• Identify standards or standardization initiatives relevant in the context of microgrids and
engage in a collaboration for coordination.
• Conclude on possible standardization recommendations to SC 8B or other TCs/SCs in IEC.
Standardization activities could proceed with cooperation of concerned TC/SCs and SyCs,
including but not limited to IEC SyC Smart Energy, SyC LVDC, TC 22, TC 57, TC 64, TC 82,
TC 88, TC 95, TC 120.
Some additional benefits are expected from the content of this document:
• harmonization of the vocabulary related to microgrids across IEC initiatives;
• harmonization of the roles and functions;
• harmonization of the context of standardization for features cross cutting the IEC
organization.
By nature, such a document is expected to evolve in order to reflect in the closest way market
needs related to microgrids usage.
The proposed list of system use cases is a first version, proposed for review; the ultimate goal
is to cover all use cases with the same level of depth.
5 Role model associated to decentralized electrical energy systems
5.1 Role model based on SGAM
The grouping of roles and actors (systems, components, operators, etc.) is based on a
commonly accepted breakdown model, the EU M490 smart grid conceptual model Smart Grid
Architecture Model (SGAM) in order to apprehend its complexity and to help maintain a global
vision. SGAM is described in detail in IEC TR 62357-1 and IEC SRD 63200. IEC established a
link between the SGAM framework and the use case methodology through key concepts: roles,
business processes, activities, systems and functions in IEC SRD 62913-1. The SGAM
framework enables the design of new smart grid architecture components to be organized on a
three-axis basis (see Figure 1).

Figure 1 – The Smart Grid Architecture Model (CEN-CENELEC-ETSI, 2014)
5.2 Business roles
Table 1 lists the business roles that have been identified so far by IEC SyC Smart Energy
following the guidelines for role modelling of IEC SRD 62913-1. This list is not exhaustive and
will be updated as the use cases are drafted.
Table 1 – Business roles of the domain
Business roles Definition
Generation and DER roles
Responsible party for overall market and financial decisions and contracts related to
DER owner
DER including microgrid design and operations
Responsible party for operational aspects of the facilities and their DER systems
DER operator
including real time microgrid operations
A party which aggregates flexibilities for its customers.
Flexibility aggregator Can activate flexibility sites.
Equivalent to retail energy provider (REP) in this document.
DER equipment
Entity that produces, tests, sells, and implements DER systems
manufacturer
Party generating electric energy.
Producer Additional information: This is a type of grid user.
[SOURCE: IEC 60050-617:2009, 617-02-01]
Network user that consumes and produces electrical energy
Prosumer
[SOURCE: IEC 60050-617:2017, 617-02-16]
Electricity producer with generator(s) connected to the distribution grid. Production
Decentralized electricity
can be dispatchable or non-dispatchable.
producer
This is a type of producer.
Power plant operator Responsible party for operational aspects of a power plant

– 14 – IEC TR 62898-4:2023 © IEC 2023
Business roles Definition
Responsible party for market and financial decisions and contracts related to a
Power plant owner
power plant
Client / customer /
A party connected to the EPS that contracts for the ability to consume electricity at
consumer (of electricity
a metering point.
supplier)
A party connected to the EPS and consuming or producing electricity or both. Grid
users include consumers, producers, and prosumers.
Grid user
Equivalent to party connected to the grid.
Party responsible for the safe and reliable operation of a microgrid
Microgrid operator
[SOURCE: IEC 60050-617:2017, 617-02-19]
Third party managing DER systems based on market information, financial
Microgrid owner
decisions and contracts related to a microgrid
Transmission and distribution domain
Entity responsible for the planning, operation, maintenance, and the development in
given areas of the electricity network (LV, MV, and potentially HV), the quality of
electricity supply (power delivery, voltage etc.), to arrange for grid connections to
Microgrid manager
DERs and prosumers.
The microgrid manager is responsible for the management of DER within the
microgrid premises to match consumption.
Retail energy provider
Third party managing DER systems based on market information
(REP)
Party responsible for safe and reliable operation of a part of the electric power
system (EPS) in a certain area and for connection to other parts of the electric
System operator
power system
[SOURCE: IEC 60050-617:2009, 617-02-09]
Party operating a distribution system
[SOURCE: IEC 60050-617:2009, 617-02-10]
The DSO is responsible for the planning, operation, maintenance, and the
development in given areas of the electricity distribution network (LV, MV, and
potentially HV), the quality of electricity supply (power delivery, voltage etc.), grid
Distribution system
connection of DERs and prosumers for customer access to energy supply retail
operator (DSO)
market through the DSO's system under regulated conditions.
According to Article 2.6 of the Electricity Directive 2009/72/EC (Directive): "a
natural or legal person responsible for operating, ensuring the maintenance of and,
if necessary, developing the distribution system in a given area and, where
applicable, its interconnections with other systems and for ensuring the long-term
ability of the system to meet reasonable demands for the distribution of electricity"
Party operating a transmission system
[SOURCE: IEC 60050-617:2009, 617-02-11]
The TSO is responsible for the planning, operation, maintenance, and the
development in given areas of the electricity transmission network (HV), the quality
of electricity supply (frequency and voltage), and access to the bulk market system
for DER systems capable of participating.
Transmission system
According to Article 2.4 of the Electricity Directive 2009/72/EC (Directive): "a
operator (TSO)
natural or legal person responsible for operating, ensuring the maintenance of and,
if necessary, developing the transmission system in a given area and, where
applicable, its interconnections with other systems, and for ensuring the long-term
ability of the system to meet reasonable demands for the transmission of
electricity". Moreover, the TSO is responsible for connection of all grid users at the
transmission level and connection of the DSOs within the TSO control area.
[SOURCE: EU Commission Task Force for Smart Grids, EG3]
Balancing responsible Party contractually responsible for the observed differences between electricity
arty supplied and electricity consumed, within a defined area
Market services roles
Service provider or Entity providing electricity-related services (such as energy efficiency or
energy service provider communication services)
Bulk power market or Entity providing a market for buying and selling energy and ancillary services to the
transmission market bulk power system

Business roles Definition
Entity providing a market for buying and selling energy and ancillary services to the
distribution power system
Distribution market
In general, this entity does not exist as a "market", but many energy service
providers can provide related capabilities.
Entity providing energy prices to consumers and prosumers so that they can change
Demand response market
their energy demand based on those prices
Third party roles
A party responsible for installing, maintaining, testing, certifying and
decommissioning physical meters in compliance with the regulated conditions for
Meter operator
contract between ESR and their customers
[SOURCE: ENTSO-E, EFET, and ebIX, 2010]
A party responsible for registering the parties linked to the metering points in a
Metering Grid Area. The metering point administrator is also responsible for
Metering point
maintaining the Metering Point technical specifications. The metering point
administrator
administrator is responsible for creating and terminating metering points.
[SOURCE: ENTSO-E, EFET, and ebIX, 2014]
Telecommunications
Entity that offers telecommunications services
operator
Entity that installs and maintains smart electric systems for industrial, commercial,
Electricity installer
and residential purposes
Equipment manufacturer Entity that produces and sells electrical devices and electricity management devices

In addition, analysis has highlighted the need to extend business roles listed above with the
following role:
Third party roles
A party responsible for providing weather forecast suitable for asset power forecast
Weather service provider
that can affect DER dispatchability

5.3 System roles
Table 2 lists the system roles identified by the IEC SyC Smart Energy and SC8B AhG2 relevant
for this document along with some necessary additions.
To sort the system roles, the distinction was made between general and specific system roles.
A specific system role is always attached to a general system role. A specific system role
inherits the properties of the general system role and can also be referred to by the general
system role. A system role can both be a general and a specific system role.
Note that this list is not intended to be exhaustive, nor does it intend to show all the relationships
between different roles. Its intent is to serve the purpose of this document to provide details on
the system roles to better describe the system use case.

– 16 – IEC TR 62898-4:2023 © IEC 2023
Table 2 – System roles of the domain
System roles
Definition
General system role Specific system role
Level 0 Electric Power System
Composite, comprised of one or more generating sources,
and connecting transmission and distribution facilities,
operated to supply electric energy
Electric power system Note 1 to entry: A specific electric power system includes

(EPS) all installations and plant, within defined bounds, provided
for the purpose of generating, transmitting and distributing
electric energy.
[SOURCE: IEC 60050-692:2017, 692-01-02]
An EPS contained entirely within a single premises or
Local EPS
group of premises
Area EPS An EPS that serves local EPSs
A local EPS that can operate as an island and can be
Microgrid EPS
operated as a virtual resource to the area EPS
DC EPS A local EPS that operates direct current
The overall measurement system of an EPS, consisting of
EPS measurement
all the sensors and relays that measure, record and deliver
system
the electrical state variables of the EPS
Frequency A set of equipment that can measure frequency, record and

measurement system provide the data for other systems to use.
Voltages measurement A set of equipment that can measure voltage, record and

system provide the data for other systems to use.
Reference point on the electric power system where the
user’s electrical facility is connected.
Note 1 to entry: In this document, point of connection
indicates a point where an area EPS is connected to
another local, DER or microgrid EPS.
Point of connection
[[SOURCE: IEC 60050-617:2009, 617-04-01, modified –

(POC)
Note 1 to entry added.]
NOTE For those POC between a utility EPS and a plant
or site EPS, this point is identical to the point of common
coupling (PCC) in IEEE Std 1547 "Standard for
Interconnecting Distributed Resources with Electric Power
Systems".
POC switch Switch plus its controller at the POC
EPS switch Switch plus its controller within an EPS
Synchronizing Equipment that synchronizes the frequency, voltage

equipment magnitude and angle between two EPSs
Meteorological service providing weather system that can
Weather system
affect DER capabilities
System roles
Definition
General system role Specific system role
Level 1 Energy Resources
A set of one or more energy service resources, including
Virtual resource (high
generators, energy storage, controllable load, and ancillary
level)
services
A distributed set of one or more energy service resources,
Distributed energy
including generators, energy storage, and ancillary
resource (DER)
services
DER system whose prime energy mover comes from
Renewable DER renewable sources, including water, solar, wind, and
biofuels
A rotating machinery in which the kinetic wind energy is
transformed into another form of energy
Wind turbine
[SOURCE: IEC 60050-415:1999, 415-01-01]
A power station in which the gravitational energy of water
Hydroelectric power
is converted into electricity
station
[SOURCE: IEC 60050-602:1983, 602-01-04]
A power station producing electrical energy from solar
radiation directly by photovoltaic effect, or indirectly by
Solar power station
thermal transformation
[SOURCE: IEC 60050-602:1983, 602-01-29]
A thermal power station in which the thermal energy is
Biomass power plant
obtained by a combustion of biomass
A thermal power station in which thermal energy is
Geothermal power
extracted from suitable parts of the Earth's crust

station
[SOURCE: IEC 60050-602:1983, 602-01-28]
The production of heat which is used for non-electrical
purposes and also for electricity.
Combined heat and
[SOURCE: IEC 60050-60
...