IEC TS 61400-25-71:2019

IEC TS 61400-25-71 ®
Edition 1.0 2019-09
TECHNICAL
SPECIFICATION
colour
inside
Wind energy generation systems –
Part 25-71: Communications for monitoring and control of wind power plants –
Configuration description language

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IEC TS 61400-25-71 ®
Edition 1.0 2019-09
TECHNICAL
SPECIFICATION
colour
inside
Wind energy generation systems –

Part 25-71: Communications for monitoring and control of wind power plants –

Configuration description language

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 27.180 ISBN 978-2-8322-7392-0

– 2 – IEC TS 61400-25-71:2019  IEC 2019
CONTENTS
FOREWORD . 4
1 Scope . 6
2 Normative references . 6
3 Terms and definitions . 7
4 Abbreviated terms . 8
5 SCL introduction . 9
5.1 General . 9
5.2 SCL sections . 10
5.3 SCL file types . 12
5.4 SCL tools . 13
6 SCL use cases in the wind power domain . 14
6.1 General . 14
6.2 IED level interface server configuration . 15
6.2.1 General . 15
6.2.2 Configuration process . 16
6.3 WPPS level interface server configuration . 16
6.3.1 General . 16
6.3.2 Configuration process . 18
6.4 Client data flow definition . 18
6.4.1 General . 18
6.4.2 Configuration process . 19
6.5 Topology definition . 21
6.5.1 General . 21
6.5.2 SCL components used to define the topology . 21
6.5.3 Configuration process . 24
7 Mapping specific configuration . 24
7.1 General . 24
7.2 Web Services mapping configuration parameters – WS communication
parameters . 24
7.3 MMS mapping configuration parameters . 25
7.3.1 MMS communication configuration parameters . 25
7.3.2 MMS extension data types configuration . 25
7.4 IEC 60870-5-101/104 mapping configuration parameters . 26
7.4.1 IEC 60870-5-101/104 communication parameters . 26
7.4.2 IEC 60870-5-101/104 addressing . 28
7.5 DNP3 specific mapping configuration parameters . 29
7.5.1 DNP3 communication parameters . 29
7.5.2 DNP3 addressing . 31
7.6 OPC UA mapping configuration parameters – OPC UA communication
parameters . 32
Annex A (informative) SCL schema extensions for its use within IEC 61400-25
projects . 33
A.1 General . 33
A.2 Extensions in the DataTypeTemplates section . 33
A.2.1 tCdcEnum . 33
A.2.2 tBasicTypeEnum . 33

A.3 Extensions in the Process section . 33
A.3.1 tProcess . 33
A.3.2 ref2SubstationFromTerminal . 33
A.4 Extensions in the Communication section – tPTypeEnum. 33
Annex B (normative) SCL schema for IEC 61400-25 . 34
Annex C (informative) Configuration examples . 82
C.1 General . 82
C.2 Wind power plant configuration with IEC 61400-25 interface at wind turbine
level . 83
C.3 Wind power plant configuration with IEC 61400-25 interface at WPPS . 84
Bibliography . 86

Figure 1 – Example with several IEDs . 15
Figure 2 – Configuration diagram . 16
Figure 3 – Example with only one IED as WPPS . 17
Figure 4 – WPPS logical node allocation . 17
Figure 5 – Report data flow configuration . 18
Figure 6 – Data flow configuration using several ICD/CID/IID files as input . 19
Figure 7 – Data flow configuration using a SCD file as input . 20
Figure 8 – Electrical connection using Line and Segments . 22
Figure 9 – Example of substation connectivity . 23
Figure C.1 – WPP topology . 82
Figure C.2 – WPP Server interface . 84

Table 1 – WS specific communication configuration parameters . 24
Table 2 – MMS specific communication configuration parameters . 25
Table 3 – IEC 60870-5-101 specific communication configuration parameters . 26
Table 4 – IEC 60870-5-104 specific communication configuration parameters . 27
Table 5 – IEC 60870-5-104 redundancy group configuration parameters. 27
Table 6 – IEC 60870-5-101/104 point mapping attributes . 29
Table 7 – DNP3 configuration parameters . 29
Table 8 – DNP3 networking communication configuration parameters . 30
Table 9 – DNP3 serial communication configuration parameters . 30
Table 10 – DNP3 point mapping attributes . 32
Table 11 – OPC UA specific communication configuration parameters . 32

– 4 – IEC TS 61400-25-71:2019  IEC 2019
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
WIND ENERGY GENERATION SYSTEMS –

Part 25-71: Communications for monitoring and control
of wind power plants – Configuration description language

FOREWORD
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Specification when
• the required support cannot be obtained for the publication of an International Standard,
despite repeated efforts, or
• the subject is still under technical development or where, for any other reason, there is the
future but no immediate possibility of an agreement on an International Standard.
Technical Specifications are subject to review within three years of publication to decide
whether they can be transformed into International Standards.
Technical Specification IEC 61400-25-71 has been prepared by IEC technical committees
TC 88: Wind energy generation systems and TC 57: Power systems management and
associated information exchange.

The text of this Technical Specification is based on the following documents:
Draft TS Report on voting
88/706/DTS 88/715A/RVDTS
Full information on the voting for the approval of this Technical Specification can be found in
the report on voting indicated in the above table.
This document has been drafted in accordance with the ISO/IEC Directives, Part 2.
A list of all parts in the IEC 61400 series, published under the general title Wind energy
generation systems, 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
• transformed into an International standard,
• 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
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
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– 6 – IEC TS 61400-25-71:2019  IEC 2019
WIND ENERGY GENERATION SYSTEMS –

Part 25-71: Communications for monitoring and control
of wind power plants – Configuration description language

1 Scope
The focus of the IEC 61400-25 series is on the communications between wind power plant
components such as wind turbines and actors such as SCADA systems.
Non-IEC 61850/IEC 61400-25 internal communication within wind power plant components is
outside the normative scope of the IEC 61400-25 series.
This document describes how to extend the IEC 61400-25 series with the IEC 61850-6
Substation Configuration description Language (SCL) file format for describing
communication-related Intelligent Electronic Device (IED) configurations of a wind turbine,
wind power plant controller, meteorological mast, etc. The extension of SCL to the wind
domain is intended to simplify integration of wind power plant equipment for clients, as well as
their integration to the electrical system. The adoption of SCL allows formalised tool-based
exchange of IED parameters, communication system configurations, switch yard (function)
structures, as well as description of the relations between them.
The purpose of this format is to formally and efficiently exchange wind turbine and wind power
plant IED capability descriptions, and system descriptions between IED engineering tools and
the system engineering tool(s) of different manufacturers in a compatible way. The file format
is also intended to provide report configuration and alarms as well as HMI interface
information from a wind power plant. This information can be used to engineer overlying
SCADA systems for the site, for connected DSO, or TSO, or for fleet operators' maintenance
and surveillance systems. Finally, the SCL is intended as a documentation of the
configuration and topology of the delivered system.
The System Configuration description Language (SCL) is defined in IEC 61850-6, which in
turn is based on Extensible Markup Language (XML) version 1.0. Extensions to the IED and
communication system model in SCL to cover IEC 61400-25-2 are included in this document.
Also Specific Communication Service Mapping (SCSM) extensions or usage rules to cover all
mappings defined in IEC 61400-25-4 and IEC 61400-25-41 are included in this document.
This document does not specify individual implementations or products using the SCL
language, nor does it constrain the implementation of entities and interfaces within a
computer system. Further this document does not intend to specify the download format of
configuration data to an IED, although the SCL format could be used as part of the
configuration data.
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.
____________
Under consideration.
IEC 61400-25-1, Wind energy generation systems – Part 25-1: Communications for
monitoring and control of wind power plants – Overall description of principles and models
IEC 61400-25-2, Wind turbines – Part 25-2: Communications for monitoring and control of
wind power plants – Information models
IEC 61400-25-3, Wind turbines – Part 25-3: Communications for monitoring and control of
wind power plants – Information exchange models
IEC 61400-25-4:2016, Wind energy generation systems – Part 25-4: Communications for
monitoring and control of wind power plants – Mapping to communication profile
IEC 61400-25-6, Wind energy generation systems – Part 25-6: Communications for monitoring
and control of wind power plants – Logical node classes and data classes for condition
monitoring
IEC 61850-5, Communication networks and systems for power utility automation – Part 5:
Communication requirements for functions and device models
IEC 61850-6:2018, Communication networks and systems for power utility automation –
Part 6: Configuration description language for communication in electrical substation related
to IEDs
IEC 61850-7-1, Communication networks and systems for power utility automation – Part 7-1:
Basic communication structure – Principles and 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, 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
3 Terms and definitions
For the purposes of this document, the terms and definitions given in IEC 61400-25-1 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
extensible
ability to include terms from other vocabularies
Note 1 to entry: This is fulfilled in SCL if the other vocabularies come with their own XML name space.

– 8 – IEC TS 61400-25-71:2019  IEC 2019
3.2
language
identifiable set of vocabulary terms that has defined constraints
Note 1 to entry: This is the case with SCL, although some constraints are not definable in the XML schema.
3.3
instance
realization by usage of a language
Note 1 to entry: For example, an XML document in SCL describing an IED or a substation is an SCL instance.
3.4
project
system part with engineering responsibility for all contained IEDs
Note 1 to entry: In general, a system is a project. However, sometimes the IED engineering responsibility for
different components of a system belongs to different parties or people. Each IED responsibility area is then a
separate project. An IED can belong to one project only. It is 'owned' by that project.
3.5
backwards compatible
ability of newer receivers to process all instances of the old language in the context of a
language change
Note 1 to entry: For SCL this means that tools built for newer language versions can understand instances from
older versions. System tools in particular should understand old ICD and SSD files, while IED tools should
understand old SCD files to be backward compatible.
3.6
language version
version of the IEC 61850-6 XML schema defining the language
Note 1 to entry: A language instance is produced according to a language (schema) version, which is called its
assigned version, although it may also be valid against other language versions.
4 Abbreviated terms
DSO Distribution system operator
IED Intelligent electronic devices
SAS Substation automated system
SCADA Supervision control and data acquisition
SCSM Specific communication service mapping
TSO Transmission system operator
WPP Wind power plant
WPPC Wind power plant controller
WPPS Wind power plant server
WS Web services
WT Wind turbine
WTC Wind turbine controller
XSD XML schema definition
XML eXtensible markup language

5 SCL introduction
5.1 General
IEC 61850-6 specifies a description language for the configuration of power utility IEDs. This
language is called System Configuration description Language (SCL) and shall be referred to
as basis for use of SCL within the wind domain. The configuration language is based on
Extensible Markup Language (XML) version 1.0.
The scope of SCL is focused on these purposes:
1) system functional specification,
2) IED capability description, and
3) system description.
These purposes shall provide standardized support to system design, communication
engineering and to the description of readily engineered system communication for device
engineering tools.
This is reached by defining an object model describing the IEDs, their communication
connections, and their allocation to the process or single-line diagram, as well as a
standardized way to describe how this model shall be represented in a file to be exchanged
between engineering tools.
SCL can be used to describe IED configurations and communication systems in accordance
with IEC 61850-5 and with the IEC 61850-7 series, for electrical equipment in the wind power
plant components, as well as to describe IED configurations and communication systems in
accordance with IEC 61400-25-2. It allows the formal description of the relations between the
wind power plant and actors such as SCADA systems, relations to electrical components
within a wind power plant, as well as the relation to the utility automation system and process
or single-line diagrams.
At the application level, the electrical topology itself and the relation of the electrical topology
to the logical nodes configured on the IEDs can be described.
SCL allows the description of an IED configuration to be passed to a communication and
application system engineering tool, and to create the whole system configuration description
in a compatible way. Its main purpose is to allow the interoperable exchange of
communication and configuration data between tools and different actors.
IEC 61850-6 specifies a file format for describing communication-related IED configurations
and IED parameters, communication system configurations, single-line diagrams, processes
and the relations among them.
The IED and communication system model in SCL is in accordance with IEC 61850-5,
IEC 61850-7-3 and IEC 61850-7-4. Specific to components of the wind power plant, the
communication system model is in accordance with IEC 61400-25-2, IEC 61400-25-3 and
IEC 61400-25-6. Services are described in SCL following requirements in IEC 61850-6 and
IEC 61850-7-2, following the generic principles outlined also in IEC 61850-7-1.
Specific Communication Service Mapping (SCSM) extensions for mapping to the supported
protocols in IEC 61400-25-4 and IEC 61400-25-41 are described in this document.
Engineering may start either with the allocation of pre-configured devices to wind power
plants, or with the design of the wind power plant functionality, where functions (logical
nodes) are allocated to physical devices later, based on the functional capabilities of devices
and their configuration capabilities.

– 10 – IEC TS 61400-25-71:2019  IEC 2019
Often a mixed approach to engineering is preferred: a process part such as a single-line
diagram is pre-engineered, and then the result is used within the process functionality as the
IEDs are configured and added to the system configuration description.
For SCL, this means that the description language shall be capable of describing:
a) a system specification in terms of the single-line diagram, and allocation of logical nodes
(LN) to components and equipment of the single line to indicate the needed functionality;
b) pre-configured IEDs with a fixed number of logical nodes (LNs), but with no binding to a
specific process – may only be related to a very general process function part;
c) pre-configured IEDs with a pre-configured semantic for a process part of a certain
structure;
d) complete process configuration with all IEDs bound to individual process functions and
primary equipment, enhanced by the access point connections and possible access paths
in subnetworks for all possible clients.
In order to support the above capabilities, several different SCL file types are defined in
IEC 61850-6, each with a semantic file name indicating its information content or the stage of
the engineering process that created the specific SCL file.
5.2 SCL sections
The SCL syntax is specified in IEC 61850-6 using an XML schema (XSD file). This schema
describes a hierarchy of information where the top level elements are:
– Header. Defines the version of the configuration files and the track of changes.
Example from Header section in SCL: