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IEC TS 62898-3-1
Edition 1.0 2020-09
TECHNICAL
SPECIFICATION
colour
inside
Microgrids –
Part 3-1: Technical requirements – Protection and dynamic control
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IEC TS 62898-3-1
Edition 1.0 2020-09
TECHNICAL
SPECIFICATION
colour
inside
Microgrids –
Part 3-1: Technical requirements – Protection and dynamic control
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 29.240.01 ISBN 978-2-8322-8764-4
– 2 – IEC TS 62898-3-1:2020 © IEC:2020
CONTENTS
FOREWORD . 4
INTRODUCTION . 6
1 Scope . 8
2 Normative references . 8
3 Terms and definitions . 8
4 Microgrid protection requirements . 15
4.1 General . 15
4.2 Main requirements specific to microgrids . 16
4.2.1 General . 16
4.2.2 Phase fault protection . 16
4.2.3 Earth fault protection . 17
4.3 General protection requirements . 17
4.3.1 General . 17
4.3.2 Dependability of protection . 17
4.3.3 Security of protection . 18
4.3.4 Availability and selectivity of protection . 18
4.3.5 Operating time (speed) of protection . 19
4.4 Particular requirements for non-isolated microgrids . 19
4.5 Particular requirements for isolated microgrids. 20
5 Protection systems for microgrids . 20
5.1 General . 20
5.2 Short-circuit protection . 21
5.2.1 Overcurrent protection . 21
5.2.2 Directional overcurrent protection . 23
5.2.3 Distance protection . 24
5.2.4 Directional power protection . 24
5.2.5 Differential protection . 24
5.3 System protection . 25
5.3.1 Under/over voltage protection . 25
5.3.2 Frequency protection . 26
5.4 Centralized protection systems . 26
6 Dynamic stability and control . 27
6.1 General . 27
6.2 Dynamic stability in microgrids . 27
6.2.1 General . 27
6.2.2 Disturbances in microgrids. 28
6.2.3 Voltage and frequency stability . 28
6.3 Dynamic control in microgrids . 29
6.3.1 General requirements . 29
6.3.2 Dynamic control functions . 29
6.3.3 Control elements in microgrids. 30
6.3.4 Control systems of microgrids . 31
6.3.5 Control of microgrids during grid-connected mode . 35
6.3.6 Control of microgrids during island mode . 35
Annex A (informative) Use cases for dynamic control of microgrids . 36
Bibliography . 40
Figure 1 – Ratio between maximum load current/minimum short-circuit current in the
microgrid . 22
Figure 2 – Control elements in microgrids . 30
Figure 3 – Hierarchical control levels of a microgrid . 32
Figure 4 – Centralized multilevel control of microgrids . 32
Figure A.1 – Simple microgrid platform for testing transient disturbance during motor
start-up . 36
Figure A.2 – Transient control strategy based on reactive current compensation
control . 36
Figure A.3 – Voltage profile during field testing of transient disturbance with and
without transient control device . 37
Figure A.4 – Current profile during field testing of transient disturbance with and
without transient control device . 37
Figure A.5 – Microgrid platform with high proportion of RES for testing dynamic
disturbance control . 38
Figure A.6 – Dynamic control strategy . 38
Figure A.7 – Voltage profile of field testing with and without dynamic control device . 39
– 4 – IEC TS 62898-3-1:2020 © IEC:2020
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
MICROGRIDS –
Part 3-1: Technical requirements –
Protection and dynamic control
FOREWORD
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