IEC TR 61850-90-7:2023

Communication networks and systems for power utility automation - Part 90-7: Object models for power converters in distributed energy resources (DER) systems

IEC TR 61850-90-7:2023, which is a Technical Report, describes functions for power converter-based distributed energy resources (DER) systems, focused on DC-to-AC and AC-to-AC conversions and including photovoltaic systems (PV), battery storage systems, electric vehicle (EV) charging systems, and any other DER systems with a controllable power converter. The functions defined in this document were used to help define the information models described in IEC 61850-7-420 and which can be used in the exchange of information between these power converter-based DER systems and the utilities, energy service providers (ESPs), or other entities which are tasked with managing the volt, var, and watt capabilities of these power converter-based systems. These power converter-based DER systems can range from very small grid-connected systems at residential customer sites, to medium-sized systems configured as microgrids on campuses or communities, to very large systems in utility-operated power plants, and to many other configurations and ownership models. They may or may not combine different types of DER systems behind the power converter, such as a power converter-based DER system and a battery that are connected at the DC level. This second edition cancels and replaces the first edition published in 2013. This edition is primarily an editorial revision in order to be consistent with the publication of Edition 2 of IEC 61850-7-420:2021. This edition includes the following significant changes with respect to the previous edition:
a) Clause 3 has been updated.
b) Clause 8 (IEC 61850 information models for power converter-based functions) has been deleted. This clause defined data models with the transitional namespace “(Tr) IEC 61850-90-7:2012”. The data models are now defined in IEC 61850-7-420.

General Information

• Status: Published
• Publication Date: 22-Aug-2023
• 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: 01-Sep-2023
• Completion Date: 23-Aug-2023

Relations

• Revises: IEC TR 61850-90-7:2013 - Communication networks and systems for power utility automation - Part 90-7: Object models for power converters in distributed energy resources (DER) systems
• Effective Date: 05-Sep-2023

Standards Content (Sample)

IEC TR 61850-90-7 ®
Edition 2.0 2023-08
TECHNICAL
REPORT
colour
inside
Communication networks and systems for power utility automation –
Part 90-7: Object models for power converters in distributed energy resources
(DER) systems
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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and French, with equivalent terms in 19 additional languages.
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(IEV) online.
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If you wish to give us your feedback on this publication or need
further assistance, please contact the Customer Service
Centre: [e-mail].
IEC TR 61850-90-7 ®
Edition 2.0 2023-08
TECHNICAL
REPORT
colour
inside
Communication networks and systems for power utility automation –
Part 90-7: Object models for power converters in distributed energy resources
(DER) systems
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 33.200 ISBN 978-2-8322-7337-1
– 2 – IEC TR 61850-90-7:2023 © IEC 2023
CONTENTS
FOREWORD . 5
1 Scope . 7
2 Normative references . 7
3 Terms, definitions, acronyms and abbreviated terms . 7
3.1 Terms and definitions . 8
3.2 Acronyms . 10
3.3 Abbreviated terms . 10
4 Overview of power converter-based DER functions . 11
4.1 General . 11
4.2 Power converter configurations and interactions . 12
4.3 Power converter methods . 14
4.4 Power converter functions . 15
4.5 Differing DER architectures . 16
4.5.1 Conceptual architecture: electrical coupling point (ECP) . 16
4.5.2 Conceptual architecture: point of common coupling (PCC) . 16
4.5.3 Utility interactions directly with power converters or indirectly via a
customer EMS . 17
4.5.4 Communication profiles . 17
4.6 General sequence of information exchange interactions. 18
5 Concepts and constructs for managing power converter functions . 19
5.1 Basic settings of power converters . 19
5.1.1 Nameplate values versus basic settings . 19
5.1.2 Power factor and power converter quadrants . 19
5.1.3 Maximum watts, vars, and volt-amp settings . 21
5.1.4 Active power ramp rate settings . 22
5.1.5 Voltage phase and correction settings . 23
5.1.6 Charging settings. 23
5.1.7 Example of basic settings . 23
5.1.8 Basic setting process . 24
5.2 Modes for managing autonomous behaviour . 24
5.2.1 Benefits of modes to manage DER at ECPs . 24
5.2.2 Modes using curves to describe behaviour . 25
5.2.3 Paired arrays to describe mode curves . 26
5.2.4 Percentages as size-neutral parameters: voltage and var calculations . 27
5.2.5 Hysteresis as values cycle within mode curves . 27
5.2.6 Low pass exponential time rate . 28
5.2.7 Ramp rates . 29
5.2.8 Randomized response times . 29
5.2.9 Timeout period . 30
5.2.10 Multiple curves for a mode . 30
5.2.11 Multiple modes . 30
5.2.12 Use of modes for loosely coupled, autonomous actions . 30
5.3 Schedules for establishing time-based behaviour . 30
5.3.1 Purpose of schedules . 30
5.3.2 Schedule components . 31
6 DER management functions for power converters . 32
6.1 Immediate control functions for power converters . 32

6.1.1 General . 32
6.1.2 Function INV1: connect / disconnect from grid . 33
6.1.3 Function INV2: adjust maximum generation level up/down . 33
6.1.4 Function INV3: adjust power factor . 34
6.1.5 Function INV4: request active power (charge or discharge storage) . 34
6.1.6 Function INV5: pricing signal for charge/discharge action . 35
6.2 Modes for volt-var management . 36
6.2.1 VAr management modes using volt-var arrays . 36
6.2.2 Example setting volt-var mode VV11: available var support mode with
no impact on watts . 37
6.2.3 Example setting volt-var mode VV12: maximum var support mode

based on WMax . 38
6.2.4 Example setting volt-var mode VV13: static power converter mode
based on settings . 40
6.2.5 Example setting volt-var mode VV14: passive mode with no var support. 41
6.3 Modes for frequency-related behaviours . 41
6.3.1 Frequency management modes . 41
6.3.2 Frequency-watt mode FW21: high frequency reduces active power . 42
6.3.3 Frequency-watt mode FW22: constraining generating/charging by
frequency . 44
6.4 Dynamic reactive current support during abnormally high or low voltage
levels . 47
6.4.1 Purpose of dynamic reactive current support . 47
6.4.2 Dynamic reactive current support mode TV31: support during
abnormally high or low voltage levels . 47
6.5 Low/high voltage ride-through curves for “must disconnect” and “must
remain connected” zones . 51
6.5.1 Purpose of L/HVRT . 51
6.5.2 “Must disconnect” (MD) and “must remain connected” (MRC) curves . 51
6.6 Modes for watt-triggered behaviours . 53
6.6.1 Watt-power factor mode WP41: feed-in power controls power factor . 53
6.6.2 Alternative watt-power factor mode WP42: feed-in power controls power
factor . 53
6.7 Modes for voltage-watt management . 54
6.7.1 Voltage-watt mode VW51: voltage-watt management: generating by

voltage . 54
6.7.2 Voltage-watt mode VW52: voltage-watt management: charging by
voltage . 54
6.8 Modes for behaviours triggered by non-power parameters . 55
6.8.1 Temperature mode TMP . 55
6.8.2 Pricing signal mode PS . 55
6.9 Setting and reporting functions . 56
6.9.1 Purpose of setting and reporting functions . 56
6.9.2 Establishing settings DS91: modify power converter-based DER
settings . 56
6.9.3 Event logging DS92: log alarms and events, retrieve logs . 56
6.9.4 Reporting status DS93: selecting status points, establishing reporting

mechanisms . 60
Bibliography . 62

– 4 – IEC TR 61850-90-7:2023 © IEC 2023
Figure 1 – DER management hierarchical interactions: autonomous, loosely-coupled,
broadcast/multicast . 14
Figure 2 – Electrical Connection Points (ECP) and Point of Common Coupling (PCC) . 17
Figure 3 – Producer and Consumer Reference Frame conventions . 20
Figure 4 – EEI power factor sign convention . 21
Figure 5 – Working areas for different modes . 22
Figure 6 – Example of voltage offsets (VRefOfs) with respect to the reference voltage

(VRef) . 23
Figure 7 – Example of modes associated with different ECPs . 25
Figure 8 – Example of a volt-var mode curve . 26
Figure 9 – Example of hysteresis in volt-var curves. 28
Figure 10 – Example of deadband i
...

IEC TR 61850-90-7 ®
Edition 2.0 2023-08
REDLINE VERSION
TECHNICAL
REPORT
colour
inside
Communication networks and systems for power utility automation –
Part 90-7: Object models for power converters in distributed energy resources
(DER) systems
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.

IEC publications search - webstore.iec.ch/advsearchform IEC Products & Services Portal - products.iec.ch
The advanced search enables to find IEC publications by a Discover our powerful search engine and read freely all the
variety of criteria (reference number, text, technical publications previews. With a subscription you will always have
committee, …). It also gives information on projects, replaced access to up to date content tailored to your needs.
and withdrawn publications.
Electropedia - www.electropedia.org
IEC Just Published - webstore.iec.ch/justpublished
The world's leading online dictionary on electrotechnology,
Stay up to date on all new IEC publications. Just Published
containing more than 22 300 terminological entries in English
details all new publications released. Available online and once
and French, with equivalent terms in 19 additional languages.
a month by email.
Also known as the International Electrotechnical Vocabulary

(IEV) online.
IEC Customer Service Centre - webstore.iec.ch/csc

If you wish to give us your feedback on this publication or need
further assistance, please contact the Customer Service
Centre: [e-mail].
IEC TR 61850-90-7 ®
Edition 2.0 2023-08
REDLINE VERSION
TECHNICAL
REPORT
colour
inside
Communication networks and systems for power utility automation –
Part 90-7: Object models for power converters in distributed energy resources
(DER) systems
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 33.200 ISBN 978-2-8322-7452-1

– 2 – IEC TR 61850-90-7:2023 RLV © IEC 2023
CONTENTS
FOREWORD . 7
1 Scope . 9
2 Normative references . 9
3 Terms, definitions, acronyms and abbreviated terms . 10
3.1 Terms and definitions . 10
3.2 Acronyms . 10
3.3 Abbreviated terms . 15
4 Overview of power converter-based DER functions . 15
4.1 General . 16
4.2 Power converter configurations and interactions . 17
4.3 Power converter methods . 19
4.4 Power converter functions . 20
4.5 Differing DER architectures . 21
4.5.1 Conceptual architecture: electrical coupling point (ECP) . 21
4.5.2 Conceptual architecture: point of common coupling (PCC) . 21
4.5.3 Utility interactions directly with power converters or indirectly via a
customer EMS . 22
4.5.4 Communication profiles . 22
4.6 General sequence of information exchange interactions. 23
5 Concepts and constructs for managing power converter functions . 24
5.1 Basic settings of power converters . 24
5.1.1 Nameplate values versus basic settings . 24
5.1.2 Power factor and power converter quadrants . 24
5.1.3 Maximum watts, vars, and volt-amp settings . 26
5.1.4 Active power ramp rate settings . 28
5.1.5 Voltage phase and correction settings . 28
5.1.6 Charging settings. 28
5.1.7 Example of basic settings . 29
5.1.8 Basic setting process . 29
5.2 Modes for managing autonomous behaviour . 29
5.2.1 Benefits of modes to manage DER at ECPs . 29
5.2.2 Modes using curves to describe behaviour . 30
5.2.3 Paired arrays to describe mode curves . 31
5.2.4 Percentages as size-neutral parameters: voltage and var calculations . 32
5.2.5 Hysteresis as values cycle within mode curves . 33
5.2.6 Low pass exponential time rate . 34
5.2.7 Ramp rates . 35
5.2.8 Randomized response times . 35
5.2.9 Timeout period . 35
5.2.10 Multiple curves for a mode . 35
5.2.11 Multiple modes . 35
5.2.12 Use of modes for loosely coupled, autonomous actions . 36
5.3 Schedules for establishing time-based behaviour . 36
5.3.1 Purpose of schedules . 36
5.3.2 Schedule components . 36
6 DER management functions for power converters . 38
6.1 Immediate control functions for power converters . 38

6.1.1 General . 38
6.1.2 Function INV1: connect / disconnect from grid . 38
6.1.3 Function INV2: adjust maximum generation level up/down . 39
6.1.4 Function INV3: adjust power factor . 39
6.1.5 Function INV4: request active power (charge or discharge storage) . 40
6.1.6 Function INV5: pricing signal for charge/discharge action . 41
6.2 Modes for volt-var management . 41
6.2.1 VAr management modes using volt-var arrays . 41
6.2.2 Example setting volt-var mode VV11: available var support mode with
no impact on watts . 42
6.2.3 Example setting volt-var mode VV12: maximum var support mode

based on WMax . 44
6.2.4 Example setting volt-var mode VV13: static power converter mode
based on settings . 45
6.2.5 Example setting volt-var mode VV14: passive mode with no var support. 46
6.3 Modes for frequency-related behaviours . 47
6.3.1 Frequency management modes . 47
6.3.2 Frequency-watt mode FW21: high frequency reduces active power . 48
6.3.3 Frequency-watt mode FW22: constraining generating/charging by
frequency . 50
6.4 Dynamic reactive current support during abnormally high or low voltage
levels . 53
6.4.1 Purpose of dynamic reactive current support . 53
6.4.2 Dynamic reactive current support mode TV31: support during
abnormally high or low voltage levels . 53
6.5 Low/high voltage ride-through curves for “must disconnect” and “must
remain connected” zones . 57
6.5.1 Purpose of L/HVRT . 57
6.5.2 “Must disconnect” (MD) and “must remain connected” (MRC) curves . 57
6.6 Modes for watt-triggered behaviours . 59
6.6.1 Watt-power factor mode WP41: feed-in power controls power factor . 59
6.6.2 Alternative watt-power factor mode WP42: feed-in power controls power
factor . 59
6.7 Modes for voltage-watt management . 60
6.7.1 Voltage-watt mode VW51: voltage-watt management: generating by

voltage . 60
6.7.2 Voltage-watt mode VW52: voltage-watt management: charging by
voltage . 60
6.8 Modes for behaviours triggered by non-power parameters . 61
6.8.1 Temperature mode TMP . 61
6.8.2 Pricing signal mode PS . 61
6.9 Setting and reporting functions . 62
6.9.1 Purpose of setting and reporting functions . 62
6.9.2 Establishing settings DS91: modify power converter-based DER
settings . 62
6.9.3 Event logging DS92: log alarms and events, retrieve logs . 62
6.9.4 Reporting status DS93: selecting status points, establishing reporting

mechanisms . 66
7.9.5 Time synchronization DS94: time synchronization requirements .
8 IEC 61850 information models for power converter-based functions .
8.1 Overall structure of IEC 61850 .

– 4 – IEC TR 61850-90-7:2023 RLV © IEC 2023
8.2 IEC 61850 system logical nodes .
8.3 Key components of IEC 61850 information modelling of power converter-
based functions.
8.3.1 Subsets of 61850 models for power converter-based DER functions .
8.3.2 Types of interactions for settings, functions, and modes .
8.3.3 Key common data classes (CDCs) .
8.3.4 Messaging services .
8.3.5 Message errors .
8.4 Basic settings in IEC 61850 .
8.4.1 Logical nodes for basic settings .
...