IEC TR 61850-80-3:2015

Communication networks and systems for power utility automation - Part 80-3: Mapping to web protocols - Requirements and technical choices

IEC TR 61850-80-3:2015(E) describes the requirements and gives an overview of the technical solution for using web protocols as a new communication mapping (SCSM) for the IEC 61850 standard. The structure of this part of IEC 61850 illustrates a two-step approach: Collection of the use cases and requirements based upon emerging Smart Grid architectural considerations, taking into account the new extended scope of IEC 61850. Evaluation and selection of technologies in order to build a consistent SCSM.

General Information

• Status: Published
• Publication Date: 11-Nov-2015
• ICS: 33.200 - Telecontrol. Telemetering
• Technical Committee: TC 57 - Power systems management and associated information exchange
• Drafting Committee: WG 17 - TC 57/WG 17
• Current Stage: PPUB - Publication issued
• Start Date: 12-Nov-2015
• Completion Date: 29-Feb-2016

Overview

IEC TR 61850-80-3:2015 is a Technical Report in the IEC 61850 family that specifies requirements and technical choices for mapping IEC 61850 services to web protocols. It defines a two‑step approach: collection of Smart Grid use cases and requirements, and evaluation/selection of technologies to create a consistent SCSM (Substation Communication Service Mapping) based on web protocols. The report surveys candidate technologies (notably XMPP) and describes how IEC 61850 ACSI services and MMS/XER payloads can be transported over web protocol stacks while addressing performance, interoperability and cybersecurity.

Key Topics

• Scope & Requirements: Detailed requirements including transfer time, throughput, data integrity, reliability, availability, interoperability, cybersecurity, device size, scalability and ease of implementation.
• Use-case driven analysis: Use cases covering PV inverters, wind, hydro/thermal, CHP, smart customer/DR, e‑mobility, VPPs, microgrids and feeder automation guide design choices.
• Technology assessment: Evaluation and selection of web technologies suitable for a new SCSM; XMPP is presented as a primary candidate with architecture, addressing, federation and presence monitoring explained.
• Message mapping: Definition of XML payloads (XER encoding of MMS/ACSI) and rules for transporting solicited and unsolicited IEC 61850 services over XMPP.
• Security: Consideration of TLS, SASL and end‑to‑end security mechanisms for web protocol transport and device trust models.
• Interoperability & synergy: Guidance on coexistence and synergy with existing mappings (e.g., IEC 61850‑8‑1) and gateway approaches for dual‑stack environments.
• Annex material: Examples and payload samples (MMS XER), architecture figures and domain‑specific requirements.

Applications

• Utility system architects and engineers designing Smart Grid communications that require web‑protocol transport for IEC 61850 services.
• Device and software vendors implementing IEC 61850 SCSM over web stacks (XMPP clients/servers, XML/XER encoders).
• Integrators creating gateways between legacy MMS/BER mappings and web‑based SCSM implementations.
• Cybersecurity teams assessing TLS/SASL and end‑to‑end security for IEC 61850 messages transported via web protocols.
• Project managers and standardization stakeholders evaluating technology choices to reduce time‑to‑market and improve interoperability across distributed DER, VPP and customer domains.

Related Standards

• IEC 61850 (family): foundational standard for communication networks and systems for power utility automation.
• IEC 61850‑8‑1 / 8‑2: existing SCSM mappings referenced for synergy and gateway design.
• IETF protocols and specs related to XMPP, TLS and SASL (as used for authentication and transport).

Keywords: IEC TR 61850-80-3, IEC 61850, SCSM, web protocols, XMPP, XER, MMS, Smart Grid communication, power utility automation.

Standards Content (Sample)

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IEC TR 61850-80-3 ®
Edition 1.0 2015-11
TECHNICAL
REPORT
colour
inside
Communication networks and systems for power utility automation –

Part 80-3: Mapping to web protocols – Requirements and technical choices

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 33.200 ISBN 978-2-8322-2999-6

– 2 – IEC TR 61850-80-3:2015 © IEC 2015
CONTENTS
FOREWORD . 6
INTRODUCTION . 8
1 Scope . 9
2 Normative references . 10
3 Terms and definitions . 11
4 Abbreviated terms . 12
5 Main involved sub-systems and stakeholders . 12
6 Requirements description . 14
6.1 General . 14
6.2 Scope of this clause . 14
6.2.1 ACSI classes to be mapped . 14
6.2.2 Network type . 15
6.3 Requirements list . 15
6.3.1 Transfer time . 15
6.3.2 Throughput . 15
6.3.3 Data integrity (error probability) . 15
6.3.4 Reliability . 15
6.3.5 Availability . 15
6.3.6 Interoperability. 16
6.3.7 Cyber security . 16
6.3.8 Device size . 17
6.3.9 Dynamic extension of the system . 17
6.3.10 Sensitivity to cost of bandwidth . 17
6.3.11 Availability of commercial and open source tools . 17
6.3.12 Intellectual property . 18
6.3.13 Perenniality / Stability of the solution . 18
6.3.14 Request for additional resources and engineering . 18
6.3.15 Simplicity and easy implementation of the communication solution . 18
6.3.16 Ability to become a SCSM / Difficulty in filling the gap . 18
6.3.17 One single solution for all smart grid applications . 18
6.3.18 Products' time-to-market . 18
6.3.19 Minimize standardization effort . 19
7 SCSM technical description . 19
7.1 Technology assessment and choice . 19
7.2 XMPP overview . 20
7.2.1 Principles . 20
7.2.2 Address scheme . 21
7.2.3 Scalability and redundancy . 21
7.2.4 Server federation . 22
7.2.5 Stanza example . 22
7.2.6 Presence monitoring . 23
7.3 Communication stack overview . 23
7.4 Definition of the XML payload . 25
7.5 Transport of XML payloads over XMPP . 28
7.5.1 Mapping over XMPP overview . 28

7.5.2 Rules for mapping solicited services . 29
7.5.3 Mapping of unsolicited services . 31
7.5.4 Usage of presence monitoring . 31
7.6 Cyber security . 32
7.6.1 Security with XMPP . 32
7.6.2 Choice of technical solutions for security . 33
7.7 Mapping synthesis . 33
7.8 Synergy with existing 8-1 mapping . 35
Annex A (informative) Use cases and requirements for each domain . 38
A.1 Use cases for PV-inverters . 38
A.1.1 Scope of this clause . 38
A.1.2 Architecture overview . 38
A.1.3 Use cases . 39
A.2 Use cases for hydro and thermal generation . 40
A.2.1 Scope of this clause . 40
A.2.2 Architecture overview . 40
A.2.3 Use cases . 41
A.3 Use cases for wind power . 43
A.3.1 Scope of this clause . 43
A.3.2 Architecture overview . 43
A.3.3 Use cases . 46
A.4 Use cases for CHP . 49
A.4.1 Scope of this clause . 49
A.4.2 Architecture overview . 50
A.4.3 Use cases . 54
A.4.4 References for CHP domain . 59
A.5 Use cases of domain Smart Customer (DR) . 59
A.5.1 Scope of this clause . 59
A.5.2 Architecture overview . 60
A.5.3 Use cases . 62
A.6 Use cases for E-Mobility . 64
A.6.1 Scope of this clause . 64
A.6.2 Architecture overview . 64
A.6.3 Use cases . 64
A.7 Use cases for VPP and Microgrid . 70
A.7.1 Scope of this clause . 70
A.7.2 Architecture overview . 71
A.7.3 Use cases . 72
A.8 Use cases for feeder automation . 74
A.8.1 Scope of this clause . 74
A.8.2 Architecture overview . 74
A.8.3 Use cases . 78
A.9 Required services and performances . 79
Annex B (informative) Examples of MMS XER payloads . 82
B.1 General . 82
B.2 GetLogicalNodeDirectory . 82
B.3 Report . 88

– 4 – IEC TR 61850-80-3:2015 © IEC 2015
Figure 1 – Architecture overview . 13
Figure 2 – Device communicating with different trust levels . 17
Figure 3 – Architecture main choices . 20
Figure 4 – XMPP architecture overview . 21
Figure 5 – XMPP Federation . 22
Figure 6 – Example of a XMPP telegram . 23
Figure 7 – Simplified communication stack . 24
Figure 8 – XER encoding vs BER encoding . 26
Figure 9 – ASN.1 abstract definition of MMS PDUs (extract) . 27
Figure 10 – Example of XER payloads . 27
Figure 11 – ACSI XML Message schema for XER payload (extract) . 28
Figure 12 – XMPP architecture for IEC 61850 . 29
Figure 13 – XMPP using TLS and Simple Authentication and Security Layer (SASL) . 32
Figure 14 – End to end security over XMPP . 33
Figure 15 – Synthesis of SCSM 8-2 structure . 34
Figure 16 – SCSM 8-1 and 8-2 synergy . 35
Figure 17 – Control center with dual stack SCSM 8-1 / SCSM 8-2 . 36
Figure 18 – Gateway between SCSM 8-1 and SCSM 8-2 . 37
Figure A.1 – PV – Architecture overview for data connections to an industrial plant . 38
Figure A.2 – PV – Architecture overview for data connections to a residential plant . 39
Figure A.3 – Power plants – Typical power operator network architecture . 41
Figure A.4 – Power plants – Relationship between the actors . 41
Figure A.5 – Examples of the variety of topologies required/supported for wind power . 44
Figure A.6 – Example of use within the wind plant . 44
Figure A.7 – Example of use between the wind plant and a control center . 45
Figure A.8 – Diagram of data use hierarchy levels in condition monitoring . 45
Figure A.9 – Types of CHP plants . 50
Figure A.10 – CHP – Example of a system architecture . 51
Figure A.11 – Number of CHPs in Germany . 52
Figure A.12 – CHP use cases and involved actors . 53
Figure A.13 – CHP – Graphical presentation of frequency control within the European
power system . 55
Figure A.14 – CHP – Frequency control time characteristic . 55
Figure A.15 – Smart customer – Main actors. 60
Figure A.16 – Smart customer – Main elements of the smart customer domain (right
column) . 61
Figure A.17 – Smart customer – Logical model for customer premises communications . 61
Figure A.18 – Smart customer – Communication relationships . 62
Figure A.19 – E-Mobility – Architecture overview . 64
Figure A.20 – Architectural picture of a microgrid . 71
Figure A.21 – Architectural picture of a VPP . 72
Figure A.22 – FA – Distributed architecture of a feeder automation system . 75
Figure A.23 – FA – Semi-centralized architecture of a feeder automation system . 76
Figure A.24 – FA – Centralized architecture of a feeder automation system . 77

Table 1 – Main involved sub-systems and stakeholders . 13
Table 2 – ACSI services to be mapped . 24
Table 3 – MMS objects and services in use within this SCSM . 25
Table 4 – Mapping synthesis. 34
Table A.1 – Use case list . 39
Table A.2 – Power plants – Use case list . 42
Table A.3 – Wind – List of actors . 46
Table A.4 – Wind – Use case list . 47
Table A.5 – CHP – Use case list . 54
Table A.6 – CHP – Other use cases not feasible with existing ACSI. 59
Table A.7 – Smart customer – Use case list . 63
Table A.8 – Smart customer – Other use cases not feasible with existing ACSI . 63
Table A.9 – E-Mobility – Use case list . 65
Table A.10 – VPP/Microgrid – Use case list . 72
Table A.11 – VPP/Microgrid – Other use cases not feasible with existing ACSI . 73
Table A.12 – FA – Use case list . 78
Table A.13 – FA – Other use cases not feasible with existing ACSI . 79
Table A.14 – Synthesis – Usage of modeling classes. 79
Table A.15 – Synthesis of transfer times . 80
Table A.16 – Synthesis – New proposed functions . 81

– 6 – IEC TR 61850-80-3:2015 © IEC 2015
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
COMMUNICATION NETWORKS AND
SYSTEMS FOR POWER UTILITY AUTOMATION –

Part 80-3: Mapping to web protocols –
Requirements and technical choices

FOREWORD
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9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of
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The main task of IEC technical committees is to prepare International Standards. However, a
technical committee may propose the publication of a technical report when it has collected
data of a different kind from that which is normally published as an International Standard, for
example "state of the art".
IEC TR 61850-80-3, which is a technical report, has been prepared by IEC technical
committee 57: Power systems management and associated information exchange.

The text of this technical report is based on the following documents:
Enquiry draft Report on voting
57/1584/DTR 57/1624/RVC
Full information on the voting for the approval of this technical report can be found in the
report on voting indicated in the above table.
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.
A list of all parts in the IEC 61850 series, published under the general title Communication
networks and systems for power utility automation, can be found on the IEC website.
The committee has decided that the contents of this publication will remain unchanged until
the stability date indicated on the IEC website under "http://webstore.iec.ch" in the data
related to the specific publication. At this date, the publication will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
A bilingual version of this publication may be issued at a later date.

IMPORTANT – The 'colour inside' logo on the cover page of this publication indicates
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– 8 – IEC TR 61850-80-3:2015 © IEC 2015
INTRODUCTION
The usage of the IEC 61850 communication standard is largely spreading over all the
domains connected to the smart grid, pushing the usage of technologies adapted to the
connection of a very large number of applications and devices across the intra/internet (see
related use cases in Annex A). The involved domains typically use already well-established
protocols for exchanging data with IT level applications like resource planning, asset and
maintenance management, etc. Therefore, it becomes imperative to provide an integration
strategy that allows the integration of IEC 61850 into these various disparate protocols and
information.
In this context, Web Protocols are considered the most appropriate technology for
communication with backend systems and possibly field devices.

COMMUNICATION NETWORKS AND
SYSTEMS FOR POWER UTILITY AUTOMATION –

Part 80-3: Mapping to web protocols –
Requirements and technical choices

1 Scope
This part of IEC 61850, which is a technical report, describes the requirements and gives an
overview of the technical solution for using Web Protocols as a new communication mapping
(SCSM) for the IEC 61850 standard.
NOTE The notion of Web Protocols covers here the Web Services technologies, extended by other well deployed
technologies based on standards used in the IT domain (IETF, ISO, W3C, OASIS, etc.). The advantage is that due
to a lot of professional knowledge and practical experiences in the IT world the risk of non-interoperable solutions
in the smart grid domain will decrease.
The structure of this part of IEC 61850 illustrates a two-step approach:
• Collection of the use cases and requirements based upon emerging Smart Grid
architectural considerations, taking into account the new extended scope of IEC 61850.
Clause 6 proposes a synthesis of the global requirements, while the use cases of the
various domains are described in Annex A. The considered domains are:
– PV-inverters
– Hydro and thermal generation
– Wind power plants
– Combined Heat and Power (CHP)
– Smart customers
– E-Mobility
– Virtual Power Plants (VPP) and micro grids
– Feeder automation
• Evaluation and selection of technologies in order to build a consistent SCSM. Clause 7
presents the future SCSM 8-2, including an overview of the main selected technology:
XMPP. The following goals have been particularly considered for the definition of this
SCSM:
– Identify a single profile supporting all the services required by the domains and defined
today in ACSI.
– Cover the full life cycle of a IEC 61850 system, in collaboration with the System
Management work in WG10 (from configuration, through conformance testing, down to
maintenance). For this purpose, this part of IEC 61850 may recommend some changes
to other parts of the IEC 61850 series such as Parts 6 and 10, etc.
– Deploy cyber-security to ensure a secure environment (in compliance with the
IEC 62351 series).
– Propose rules for cohabitation with other mappings such as IEC 61850-8-1 and
IEC 61850-9-2, and possibly recommend communication profiles depending on specific
application context (pole-top equipment, inside DER, connection of DER, etc.).
– Only the A-Profile is addressed here. Nevertheless, support of TCP/IP and UDP/IP is
required for the T-Profiles.
What is not included in the study:

– 10 – IEC TR 61850-80-3:2015 © IEC 2015
• Modification of objects specified in IEC 61850-7-3 and IEC 61850-7-4
• Introduction of several competing web protocols profiles
The namespace of this document is: “(Tr)IEC 61850-80-3:2015”
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and
are indispensable for its application. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any
amendments) applies.
IEC 61850-5, Communication networks and systems for power utility automation – Part 5:
Communication requirements for functions and device models
IEC 61850-7-2, Communication networks and systems for power utility automation – Part 7-2:
Basic information and communication structure – Abstract communication service interface
(ACSI)
IEC 61850-7-3, Communication networks and systems for power utility automation – Part 7-3:
Basic communication structure – Common data classes
IEC 61850-7-4, Communication networks and systems for power utility automation – Part 7-4:
Basic communication structure – Compatible logical node classes and data object classes
IEC 61850-8-1:2011, Communication networks and systems for power utility automation –
Part 8-1: Specific communication service mapping (SCSM) – Mappings to MMS (ISO 9506-1
and ISO 9506-2) and to ISO/IEC 8802-3
IEC 62351 (all parts), Power systems management and associated information exchange –
Data and communications security
ISO 9506 (all parts), Industrial automation systems – Manufacturing Message Specification
ISO/IEC 8824-1:2008, Information technology – Abstract Syntax Notation One (ASN. 1):
Specification of basic notation
ISO/IEC 8825-1:2008, Information technology – ASN.1 encoding rules: Specification of Basic
Encoding Rules (BER), Canonical Encoding Rules (CER) and Distinguished Encoding Rules
(DER)
ISO/IEC 8825-4:2008, Information technology – ASN.1 encoding rules: XML Encoding Rules
(XER)
RFC 4330, Simple Network Time Protocol (SNTP) Version 4 for IPv4, IPv6 and OSI, IETF,
available at http://www.ietf.org
RFC 6120, Extensible Messaging and Presence Protocol (XMPP): Core
RFC 6121, Extensible Messaging and Presence Protocol (XMPP): Instant Messaging and
Presence
RFC 6122, Extensible Messaging and Presence Protocol (XMPP): Address Format

XEP-0198, Stream Management
XEP-0199, XMPP Ping
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
electrical connection point
ECP
point of electrical connection between the DER source of energy (generation or storage) and
any electric power system (EPS)
Note 1 to entry: Each DER (generation or storage) unit has an ECP connecting it to its local power system;
groups of DER units have an ECP where they interconnect to the power system at a specific site or plant; a group
of DER units plus local loads have an ECP where they are interconnected to the utility power system.
Note 2 to entry: For those ECPs between a utility EPS and a plant or site EPS, this point is identical to the point
of common coupling (PCC) in IEEE 1547, Standard for Interconnecting Distributed Resources with Electric Power
Systems.
3.2
electric power system
EPS
all installations and plant provided for the purpose of generating, transmitting and distributing
electricity; particular installations, substations, lines or cables for the transmission and
distribution of electricity
[SOURCE: IEC 60050-601:1985, 601-01-01, 601-01-02, modified (removal of Note to entry)]
3.3
electrical network
grid
particular installations, substations, lines or cables for the transmission and distribution of
electricity
Note 1 to entry: IEC 61850 also uses the following terms:
Utility Grid or Utility electrical network – this corresponds to the area EPS as defined in IEEE.
Facility Grid or Facility electrical network – this corresponds to the local EPS as defined in IEEE.
[SOURCE: IEC 60050-601:1985, 601-01-02, modified (modification of Note 1 to entry)]
3.4
point of common coupling
PCC
ECP between a utility electrical network and facility electrical network
Note 1 to entry: ECP and PCC are related to the physical connectivity of the electrical network only and are
independent from application functions.
Note 2 to entry: Other terms used are POC, PUC and PGC with sometimes similar meanings. These are not
further considered within IEC 61850, since ECP and PCC are sufficient.
_____________
This specification defines an XMPP protocol extension for active management of an XML stream between two
XMPP entities, including features for stanza acknowledgements and stream resumption.
This specification defines an XMPP protocol extension for sending application-level pings over XML streams.
Such pings can be sent from a client to a server, from one server to another, or end-to-end.

– 12 – IEC TR 61850-80-3:2015 © IEC 2015
3.5
private network
network used by a unique entity mastering all the data flows, the performance seen by which
is guaranteed in terms of bandwidth, throughput, transmission delay, availability, etc.
Note 1 to entry: A private network may be based on a public or shared infrastructure, as soon as the level of
services can be guaranteed.
3.6
public network
network not used by a unique entity mastering all the data flows or if the performance seen by
the entity using the network is not guaranteed in terms of bandwidth, throughput, transmission
delay, availability, etc.
3.7
smart grid
electric power system which uses communication networks for coordinating the actions of the
generators and consumers connected to it in order to efficiently deliver sustainable, economic
and secure electricity supplies
4 Abbreviated terms
CHP Combined heat and power
DDEMS DSO DER Energy Management System
DER Distributed Energy Resource
DMS Distribution Management System
DR Demand Response
DSO Distribution system operator
ECP Electrical Connection Point
ENTSO-E European network of transmission system operators for electricity
EPS Electric Power System
PCC Point of Common Coupling
SO System operator
TSO Transmission system operator
VPP Virtual power plant
WAN Wide Area Network
5 Main involved sub-systems and stakeholders
Figure 1 presents an overview of the main involved sub-systems and indicates for which
interactions the new IEC 61850-8-2 web protocols mapping is intended. The sub-systems
mentioned in the picture are then described in Table 1 together with other systems and
stakeholders considered in this document.

Market
Market
Trading
Trading
System
System
Enterprise
DMS DDEMS
61850-8-x 61850-8-x
Customer Energy
Management System
Operation
DER
Management
61850-8-x
System
61850-8-x
Substation
Station
Automation
61850-8-x
and
Distribution
Automation
DER Unit DER Unit DER Unit DER Unit DER Unit
Controller Controller Controller Controller Controller
Field
DER DER DER DER DER
PCC
Process
DER System
Customer premises
Distribution DER
IEC
Figure 1 – Architecture overview
Table 1 – Main involved sub-systems and stakeholders
Type Name Description
Role Aggregator Offers services to aggregate energy production, storage capability and energy
consumption. Acts towards the grid as one entity, including local aggregation of
demand (Demand Response management) and supply (generation management). In
cases where the aggregator is not a supplier, it maintains a contract with the
supplier
Role Balance A party that has a contract proving financial security and identifying balance
responsible responsibility with the imbalance settlement responsible of the market balance area
party entitling the party to operate in the market. This is the only role allowing a party to
buy or sell energy on a wholesale level
System DER unit Local controller for the DER unit. May control several DER local servers
controller
System DER local A processing unit interacting directly with the DER process by using proprietary
server communications means. Act as a communication server for the higher level systems
System DER Control Center of the VPP or Microgrid, used for monitoring and controlling the
management various sub-systems that are registered as participant in the VPP. Provides ancillary
system and balancing services to DSO
Role DER operator Any natural or legal person operating a DER plant (often this is either the plant
owner or the DSO)
Role DER owner Any natural or legal entity owning a power generating facility like e.g. CHP plants,
Wind power plants, PV plants
Role DER Entity in charge of designing, producing and selling DER Units. May be also in
manufacturer charge of the maintenance
System DER unit One or several devices at process level that are controlled by the same system at
field level. All included devices have the same type (e.g. PV) and can be for
generation purpose as well as for storage

– 14 – IEC TR 61850-80-3:2015 © IEC 2015
Type Name Description
Role DSO According to the Article 2.6 of the Electricity Directive 2009/72/EC: "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". Moreover, the
DSO is responsible for regional grid access and grid stability, integration of
renewables at the distribution level and regional load balancing
Role Energy retailer Entity selling electrical energy to consumers – could also be a grid user who has a
grid connection and access contract with the TSO or DSO. In addition, multiple
combinations of different grid user groups (e.g. those grid users that do both
consume and produce electricity) exist
Role Market The unique power exchange of trades for the actual delivery of energy that receives
operator
the bids from the Balance Responsible Parties that have a contract to bid. The
market operator determines the market energy price for the market balance area
after applying technical constraints from the system operator. It may also establish
the price for the reconciliation within a metering grid area
Role Meter operator A party responsible for installing, maintaining, testing, certifying and
decommissioning physical meters
Role Plant Facility or service provider that monitors equipment in DER plants of one or more
maintenance companies and dispatches maintainers if needed
Role Smart Industry sites, buildings or homes that contribute to and profit from demand
customer response. May be consumers and / or producers of electrical energy
System Trading system A System with application(s) which are used to trade energy in corresponding
markets, supports the dispatch in the decision to buy, sell or to self-produce energy
and also provides facilities to exchange the necessary information with the Energy
Market Platform.
Role TSO According to Article 2.4 of the Electricity Directive 2009/72/EC: "a 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
Role VPP/Microgrid Any natural or legal person responsible for aggregating DERs to Virtual Power
operator Plants
6 Requirements description
6.1 General
This clause describes the requirements used during the process for selecting a technical
solution.
The first fourteen requirements (6.3.1 to 6.3.14) have been analyzed domain by domain, so
that what is presented here is a synthesis of a detailed analysis of each domain.
The last five requirements (6.3.15 to 6.3.19) are general requirements relevant for rating
technical solutions but which do not depend especially on the considered domains.
6.2 Scope of this clause
6.2.1 ACSI classes to be mapped
The usage of the various ACSI classes defined in IEC 61850-7-2 has been studied for each
domain. The synthesis presented in Table A.14 shows that all the classes using the
client/server model need to be mapped, as well as the configuration services for the classes
using a peer-to-peer model (i.e. GOOSE and SMV).
Regarding the peer-to-peer model, the requirements expressed in Table A.15 for peer-to-peer
messages in terms of transfer time is currently not compliant with the performances expected

from web protocols. When required for a specific use case, an existing mapping like the one
defined for example in IEC 61850-90-5 may be used. Nevertheless, usage of web protocols
for implementing one-to-many interactions, even with lower performances, may be studied in
the future.
6.2.2 Network type
The analysis of the different use cases listed in Annex A has
...