IEC TR 61850-90-27:2023

IEC TR 61850-90-27
®

Edition 1.0 2023-08
TECHNICAL
REPORT

colour
inside


Communication networks and systems for power utility automation –
Part 90-27: Use of IEC 61850 for thermal energy systems connected to electric
power grid

IEC TR 61850-90-27:2023-08(en)

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IEC TR 61850-90-27

®


Edition 1.0 2023-08




TECHNICAL



REPORT








colour

inside










Communication networks and systems for power utility automation –

Part 90-27: Use of IEC 61850 for thermal energy systems connected to electric

power grid
























INTERNATIONAL

ELECTROTECHNICAL


COMMISSION





ICS  33.200 ISBN 978-2-8322-7339-5




  Warning! Make sure that you obtained this publication from an authorized distributor.


® Registered trademark of the International Electrotechnical Commission

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– 2 – IEC TR 61850-90-27:2023 © IEC 2023
CONTENTS
FOREWORD . 8
INTRODUCTION . 10
1 Scope . 11
1.1 General . 11
1.2 Data model Namespace name and version . 11
1.3 Data model Namespace Code Component distribution . 12
2 Normative references . 13
3 Terms and definitions . 13
4 Abbreviated terms . 16
4.1 General purpose abbreviated terms . 16
4.2 Abbreviated terms used in data object names . 17
5 Overview of thermal systems . 17
5.1 General . 17
5.2 System structure . 18
5.3 Energy transformation . 19
5.3.1 General . 19
5.3.2 Transformation from electricity to thermal energy . 19
5.3.3 Transformation from thermal energy to electricity . 20
5.3.4 CHP device . 20
6 Use cases . 21
6.1 General . 21
6.2 Common actors . 21
6.2.1 General . 21
6.2.2 Actors from IEC 62913-2-3 . 21
6.2.3 Actors originating with the thermal energy domain . 23
6.3 Use case 1: "Aggregated energy storage in buildings for electricity grid
congestion management via electricity demand shifting" . 23
6.3.1 Motivation . 23
6.3.2 Solution . 23
6.3.3 Benefit . 24
6.4 Use case 2: Small-scale cogeneration for e-grid stabilisation and heat
generation for use in building or injection . 25
6.4.1 Motivation . 25
6.4.2 Solution . 25
6.4.3 Benefits . 25
6.5 Use case 3: Centralised heat-pumps for hot water storage in DH plant
facilities . 26
6.5.1 Motivation . 26
6.5.2 Solution . 26
6.5.3 Benefit . 26
6.6 Use case 4: Providing tertiary reserve to electric power systems by demand
response using thermal energy storage . 26
6.6.1 General . 26
6.6.2 Motivation . 26
6.6.3 Solution . 27
6.6.4 Benefits . 28
7 Information model requirements . 28

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IEC TR 61850-90-27:2023 © IEC 2023 – 3 –
7.1 General . 28
7.2 Mappings of requirements on LN classes at the resource level . 28
7.3 Mappings of requirements on LN classes at the operational function level . 33
7.4 Mappings of requirements on LN classes at the reference point level in
thermal energy network . 34
8 Logical node classes and data objects modelling . 36
8.1 General . 36
8.1.1 General . 36
8.1.2 Modelling principles of logical nodes considering sector coupling . 36
8.2 Generic resource LN . 39
8.2.1 Generic LN classes related to electrical DERs (DGEN, DSTO and
DLOD) . 39
8.2.2 Generic LN classes related to thermal energy resources (DGTH, DSTH
and DLTH) . 39
8.2.3 Generic LN classes related to both electrical DERs and thermal energy

resources (DETH and DETG) . 40
8.3 LN classes related to specific type of units . 40
8.3.1 General . 40
8.3.2 Modelling P2H units . 41
8.3.3 Modelling of CHP . 44
8.3.4 Modelling of thermal storage units . 45
8.4 Modelling of operational functions for energy services . 46
8.5 Modelling of reference points in thermal systems . 48
9 LN class definitions . 49
9.1 General . 49
9.2 Abstract logical nodes for thermal systems (AbstractLNs_90_27) . 49
9.2.1 General . 49
9.2.2 <> LN: All energy (electricity, thermal energy, and gas) mixed
DER  Name: AllEnergyMixedDERLN . 51
9.2.3 <> LN: Transformation from electricity to thermal  Name:
TransformationFromElectricityToThermalLN . 51
9.2.4 <> LN: Transformation from thermal energy to
electricity  Name: TransformationFromThermalToElectricityLN . 52
9.2.5 <> LN: Mixed electricity and thermal generator  Name:
MixedElectricityAndThermalGeneratorLN . 52
9.2.6 <> LN: Thermal resource  Name: ThermalResourceLN . 52
9.2.7 <> LN: Non thermal storage operational settings  Name:

NonThermalStorageOperationalSettingsLN . 53
9.2.8 <> LN: Thermal storage operational settings  Name:
ThermalStorageOperationalSettingsLN . 54
9.2.9 <> LN: Electricity to thermal energy unit  Name:
ElectricityToThermalUnitLN . 54
9.2.10 <> LN: Thermal operation function  Name:

ThermalOperationalFunctionLN . 54
9.2.11 <> LN: Thermal reference point  Name:
ThermalReferenceLN . 54
9.2.12 <> LN: Physical thermal reference  Name:
PhysicalThermalReferenceLN . 55
9.2.13 <> LN: Virtual Thermal Reference Point  Name:

VirtualThermalReferenceLN . 55
9.3 Generic logical nodes for thermal resource (LNGroupD) . 56
9.3.1 General . 56

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– 4 – IEC TR 61850-90-27:2023 © IEC 2023
9.3.2 LN: Thermal generating resource  Name: DGTH . 56
9.3.3 LN: Thermal storage resource  Name: DSTH . 61
9.3.4 LN: Thermal load resource  Name: DLTH . 65
9.3.5 LN: Mixed electricity and thermal generating unit  Name: DETG . 68
9.3.6 LN: Electricity to thermal transforming unit  Name: DETH . 71
9.4 Extended logical nodes for distributed energy resources (LNGroupD) . 74
9.4.1 General . 74
9.4.2 LN: DER generating unit extended in 90-27  Name: DGENExt . 74
9.4.3 LN: DER load unit extended in 90-27  Name: DLODExt . 84
9.5 Unit type logical nodes for thermal resources (LNGroupD) . 93
9.5.1 General . 93
9.5.2 LN: CHP system controller  Name: DCHCExt . 93
9.5.3 LN: Fuel cell controller  Name: DFCLExt . 96
9.5.4 LN: Electric heat pump  Name: DHPM . 99
9.5.5 LN: Electric resistance heater  Name: DRSH . 103
9.6 Logical nodes for operational functions related to thermal systems
(LNGroupD) . 105
9.6.1 General . 105
9.6.2 LN: Thermal comfort profile  Name: DTHP . 105
9.6.3 LN: Mode to cause DER to set active power  Name: DWGCExt . 107
9.7 Logical nodes for thermal reference points (LNGroupD) . 112
9.7.1 General . 112
9.7.2 LN: Thermal Connection Point  Name: DTCP . 113
9.7.3 LN: Thermal Point of Common Coupling  Name: DTPC . 115
9.7.4 LN: Virtual Thermal Connection Point  Name: DVTR . 117
9.8 Logical nodes for metering and measurement (LNGroupM) . 119
9.8.1 General . 119
9.8.2 LN: Local electric power system measurement  Name: MLPS . 120
9.8.3 LN: Thermal energy measurement  Name: MTHM . 122
9.9 Logical nodes for further power system equipment (LNGroupZ) . 124
9.9.1 General . 124
9.9.2 LN: Power cable  Name: ZCABExt . 124
9.9.3 LN: Power overhead line  Name: ZLINExt . 127
9.10 Enumerated data attribute types . 130
9.10.1 General . 130
9.10.2 Classes list . 131
9.10.3 ThermalGeneratorStateKind enumeration . 131
9.10.4 ThermalGeneratorOperationModeType enumeration . 132
9.10.5 ThermalStorageOperationControlKind enumeration . 132
9.10.6 HeatSourceKind enumeration . 132
9.10.7 CompressorKind enumeration . 133
9.10.8 ThermalComfortStatusKind enumeration . 133
9.10.9 ThermalStorageKind enumeration . 133
9.10.10 ThermalMediumKind enumeration . 134
9.10.11 FuelCellKind enumeration . 134
9.10.12 TCPIslandStateKind enumeration . 135
9.10.13 ThermalGenerationKind enumeration . 135
Annex A (informative) Complete descriptions of use cases . 136

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IEC TR 61850-90-27:2023 © IEC 2023 – 5 –
A.1 Aggregated energy storage in buildings for electricity grid congestion
management via electricity demand shifting . 136
A.1.1 Description of the use case . 136
A.1.2 Diagrams of use case . 138
A.1.3 Technical details . 139
A.1.4 Step by step analysis of use case . 142
A.1.5 Information exchanged . 147
A.1.6 Common terms and definitions . 147
A.2 Small-scale cogeneration for e-grid stabilisation and heat generation for use
in building or injection . 147
A.2.1 Description of use case . 147
A.2.2 Diagrams of use case . 149
A.2.3 Technical details . 151
A.2.4 Step by step analysis of use case . 153
A.2.5 Information exchanged . 158
A.2.6 Common terms and definitions . 158
A.3 Centralised heat-pumps for hot water storage in DH plant facilities . 158
A.3.1 Description of use case . 158
A.3.2 Diagrams of use case . 160
A.3.3 Technical details . 162
A.3.4 Step by step analysis of use case . 164
A.3.5 Information exchanged . 166
A.3.6 Common terms and definitions . 167
A.4 Providing tertiary reserve to electric power systems by demand response
using thermal energy storage . 167
A.4.1 Description of use case . 167
A.4.2 Use case diagram . 172
A.4.3 Technical details . 173
A.4.4 Step by step analysis of user case . 174
A.4.5 Information exchanged . 177
A.4.6 Common terms and definitions . 179
Annex B (informative) Considerations of LN design for CHP . 180

Figure 1 – A typical structure of thermal system . 18
Figure 2 – A configuration of heat pump. 19
Figure 3 – A typical configuration of a CHP device . 20
Figure 4 – Configuration and behaviour of a polymer electrolyte fuel cell . 21
Figure 5 – UC1 Case 1: The aggregated electricity demand is lower than electricity
generation . 24
Figure 6 – UC1 Case 2: The aggregated electricity demand is higher than electricity
generation . 24
Figure 7 – Main use case diagram of UC4: Providing tertiary reserve to electric power
systems by demand response using thermal energy storage . 27
Figure 8 – Hierarchical class model of DER resources – basic principles . 37
Figure 9 – Principles to guide the extension of IEC 61850-7-420 for supporting other

types of energies . 38
Figure 10 – Logical nodes representing data related to thermal system . 40
Figure 11 – An example of a simple DER resource model of a PV generating unit . 41
Figure 12 – Modelling of a heat pump . 43

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– 6 – IEC TR 61850-90-27:2023 © IEC 2023
Figure 13 – Data objects in DLOD and DETH . 44
Figure 14 – Modelling of a CHP . 45
Figure 15 – An example of thermal storage resources including thermal mass in a
building with mappings to logical nodes . 46
Figure 16 – DER Generic model. 47
Figure 17 – Modelling of operational functions for thermal systems . 48
Figure 18 – Class model of an Electric Reference Point . 48
Figure 19 – Proposed extension of the class model of an Electric Reference Point . 49
Figure 20 – Class diagram AbstractResourceLNs . 50
Figure 21 – Class diagram AbstractUnitLNs . 50
Figure 22 – Class diagram AbstractOperationalFunctionLNs . 51
Figure 23 – Class diagram for resources . 56
Figure 24 – Class diagram for resource units . 93
Figure 25 – Class diagram for thermal reference points . 113
Figure 26 – Class diagram for measurements . 120
Figure 27 – Class diagram for lines and cables . 124
Figure 28 – Class diagram DOEnums_90_27::DOEnums_90_27 . 131
Figure A.1 – Facility HVAC system with Thermal Energy Storage – Normal Operation
(Peak Shift) . 169
Figure A.2 – Facility HVAC system with Thermal Energy Storage – Demand Response
with Normal Operation . 169
Figure A.3 – Thermal energy storage system configuration . 170
Figure A.4 – Thermal system and related actors . 170
Figure A.5 – HVAC&R facilities operations in regular rotation . 171
Figure A.6 – Use case diagram for providing tertiary reserve to electric power systems
by demand response using thermal energy storage . 172
Figure A.7 – Sequence diagram for providing tertiary reserve to electric power systems

by demand response using thermal energy storage . 173


Table 1 – Tracking information of (Tr)IEC 61850-90-27:2023A namespace . 12
Table 2 – Attributes of (Tr)IEC 61850-90-27:2023A namespace . 12
Table 3 – Normative abbreviations for data object names . 17
Table 4 – Common actors from IEC SRD 62913-2-3 . 22
Table 5 – Actors originating with thermal energy domain . 23
Table 6 – Mappings of requirements and IEC 61850 for DER system and coupling point . 29
Table 7 – Mappings of requirements and IEC 61850 for P2H resource . 29
Table 8 – Mappings of requirements and IEC 61850 for aggregated energy storage
resource . 31
Table 9 – Mappings of requirements and IEC 61850 for CHP resource . 32
Table 10 – Mappings of requirements and IEC 61850 for operational function level . 34
Table 11 – Mappings of requirements and IEC 61850 for reference point . 34
Table 12 – Data objects of AllEnergyMixedDERLN . 51
Table 13 – Data objects of TransformationFromElectricityToThermalLN . 52
Table 14 – Data objects of ThermalResourceLN . 52
Table 15 – Data objects of NonThermalStorageOperationalSettingsLN . 53

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IEC TR 61850-90-27:2023 © IEC 2023 – 7 –
Table 16 – Data objects of ElectricityToThermalUnitLN . 54
Table 17 – Data objects of ThermalOperation
...