IEC TS 62898-3-4:2023

Microgrids - Part 3-4: Technical requirements - Microgrid monitoring and control systems

IEC TS 62898-3-4:2023 provides technical requirements for the monitoring and control of microgrids. This document applies to non-isolated or isolated microgrids integrated with distributed energy resources. This document describes the specific recommendations for low-voltage (LV) and medium-voltage (MV) microgrids.
This document focuses on standardization of the architecture, functions, and operation of microgrid monitoring and control systems (MMCS). It teases out the general functions of MMCS and provides technical requirements for MMCS. This document includes the following aspects of MMCS:
• system architecture,
• information exchange with other devices/functions in microgrid,
• performance requirement,
• main function descriptions.

General Information

• Status: Published
• Publication Date: 24-Aug-2023
• ICS: 29.240.01 - Power transmission and distribution networks in general
• Technical Committee: SC 8B - Decentralized electrical energy systems
• Drafting Committee: WG 3 - TC 8/SC 8B/WG 3
• Current Stage: PPUB - Publication issued
• Start Date: 25-Aug-2023
• Completion Date: 25-Aug-2023

Standards Content (Sample)

IEC TS 62898-3-4 ®
Edition 1.0 2023-08
TECHNICAL
SPECIFICATION
Microgrids –
Part 3-4: Technical requirements – Microgrid monitoring and control systems

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IEC TS 62898-3-4 ®
Edition 1.0 2023-08
TECHNICAL
SPECIFICATION
Microgrids –
Part 3-4: Technical requirements – Microgrid monitoring and control systems

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 29.240.01  ISBN 978-2-8322-7438-5

– 2 – IEC TS 62898-3-4:2023 © IEC 2023
CONTENTS
FOREWORD . 4
INTRODUCTION . 6
1 Scope . 8
2 Normative references . 9
3 Terms, definitions and abbreviated terms . 10
3.1 Terms and definitions . 10
3.2  Abbreviated terms . 12
4 Overview . 12
4.1 General . 12
4.2 System architecture . 13
4.2.1 Stand-alone MMCS . 13
4.2.2 Integrated MMCS . 14
4.3 Hardware and software architectures . 14
4.3.1 Hardware . 14
4.3.2 Software . 15
4.3.3 Database . 15
4.4 Communication and cyber security . 15
4.4.1 Communication . 15
4.4.2 Cyber security . 16
5 Functional requirements . 17
5.1 Data acquisition and processing . 17
5.1.1 Data acquisition . 17
5.1.2 Data processing . 17
5.2 Database management . 18
5.3 Human-machine interface . 18
5.4 Anti-maloperation locking and alarm . 19
5.5 Time synchronization . 20
5.6 Local power quality control . 20
5.7 Frequency/voltage regulation during steady state operation of isolated
microgrid . 20
5.8 Sequence of operations . 21
5.9 Control of device switching . 21
5.10 Operating mode transition . 21
5.10.1 General . 21
5.10.2 Transition from island mode to grid-connected mode . 22
5.10.3 Transition from grid-connected mode to island mode . 22
5.11 Active and reactive power control . 22
5.11.1 General . 22
5.11.2 Active power control . 22
5.11.3 Reactive power control and voltage control . 23
5.12 Islanding detection . 23
5.13 Black start. 24
Annex A (informative) Example of collected information of MMCS . 25
A.1 Microgrid operating data . 25
A.1.1 Status data . 25
A.1.2 Measurement data . 25

A.2 Microgrid equipment operating status data . 26
A.2.1 Primary equipment operating status data . 26
A.2.2 Secondary equipment operating status data . 26
A.2.3 Auxiliary equipment operating status data . 26
A.3 Microgrid forecast data . 27
A.4 Distributed energy planning data . 27
Annex B (informative) Examples of actual microgrid applications and the associated
functions of MMCS . 28
B.1 Application CN1: MMCS of microgrid with photovoltaic and battery

compacted with monitoring and control system of intelligent office park . 28
B.1.1 General . 28
B.1.2 System structure of MMCS . 29
B.1.3 Main functions of MMCS . 29
B.1.4 Applications . 30
B.2 Application CN2: MMCS of MV small hydropower microgrid for solving power

supply problems in remote areas . 30
B.2.1 General . 30
B.2.2 System structure of MMCS . 31
B.2.3 Main functions of MMCS . 32
B.2.4 Applications . 34
B.3 Application JP1: Power stabilization with combining high-speed ΔF and ΔP
suppression control utilizing storage batteries connected to thermal
generation: the IKI island demonstration project from Japan . 36
B.3.1 General . 36
B.3.2 Purpose . 37
B.3.3 Main functions of MMCS . 37
B.3.4 Applications . 38
Bibliography . 40

Figure 1 – Functional mapping for operation and control of microgrids . 13
Figure 2 – Structure of MMCS . 14
Figure 3 – Typical three-layer communication for structure 1 . 16
Figure 4 – Typical two-layer communication for structure 2 . 16
Figure B.1 – Primary structure of Chengchuang microgrid. 28
Figure B.2 – System structure of MMCS . 29
Figure B.3 – The main single line diagram of the small hydropower microgrid . 31
Figure B.4 – The main structure of MMCS. 32
Figure B.5 – Daily voltage curve along the common line and Fengshan line before the
implementation of microgrid in flooding period and heavy load . 34
Figure B.6 – Daily voltage curve along the common line and Fengshan line after the
implementation of microgrid . 35
Figure B.7 – Daily voltage curve along the common line and Fengshan line before the
implementation of microgrid . 35
Figure B.8 – Daily voltage curve along the common line and Fengshan line after the
implementation of microgrid . 36
Figure B.9 – Overview of Iki Island power system and battery . 37
Figure B.10 – Overview of control flow . 38
Figure B.11 – Example of stable frequency due to storage battery charge / discharge . 39

– 4 – IEC TS 62898-3-4:2023 © IEC 2023
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
MICROGRIDS
Part 3-4: Technical requirements –
Microgrid monitoring and control systems

FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of IEC is to promote international
co-operation on all questions concerning standardization in the electrical and electronic fields. To this end and
in addition to other activities, IEC publishes International Standards, Technical Specifications, Technical Reports,
Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC Publication(s)”). Their
preparation is e
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