IEC TS 62933-2-2:2022

Electrical energy storage (EES) systems - Part 2-2: Unit parameters and testing methods - Application and performance testing

IEC TS 62933-2-2:2022(E) defines testing methods and duty cycles to validate the EES system’s technical specification for the manufacturers, designers, operators, utilities and owners of the EES systems which evaluate the performance of the EES systems for various applications. The following items are covered in this document. The energy storage devices and technologies are outside the scope of this document:
application;
performance testing methods;
duty cycles for specific application.

General Information

• Status: Published
• Publication Date: 25-Apr-2022
• ICS: 13.020.30 - Environmental impact assessment
• Technical Committee: TC 120 - Electrical Energy Storage (EES) systems
• Drafting Committee: WG 2 - TC 120/WG 2
• Current Stage: PPUB - Publication issued
• Start Date: 31-May-2022
• Completion Date: 26-Apr-2022

Standards Content (Sample)

IEC TS 62933-2-2 ®
Edition 1.0 2022-04
TECHNICAL
SPECIFICATION
colour
inside
Electrical energy storage (EES) systems –
Part 2-2: Unit parameters and testing methods – Application and performance
testing
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IEC TS 62933-2-2 ®
Edition 1.0 2022-04
TECHNICAL
SPECIFICATION
colour
inside
Electrical energy storage (EES) systems –

Part 2-2: Unit parameters and testing methods – Application and performance

testing
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 13.020.30 ISBN 978-2-8322-1104-1

– 2 – IEC TS 62933-2-2:2022 © IEC 2022
CONTENTS
FOREWORD . 5
INTRODUCTION . 7
1 Scope . 8
2 Normative references . 8
3 Terms, definitions and abbreviated terms . 8
3.1 Terms and definitions . 8
3.2 Abbreviated terms . 9
4 Application of EES system . 9
4.1 General . 9
4.2 Class A applications . 9
4.2.1 Frequency control . 9
4.2.2 Primary/secondary/tertiary frequency control . 9
4.2.3 Fluctuation reduction of PV and wind farms . 10
4.2.4 Reactive-power voltage control . 10
4.2.5 Voltage sag mitigation . 10
4.3 Class B applications . 10
4.3.1 Peak shaving . 10
4.3.2 Renewable firming . 10
4.3.3 Islanded grid . 11
4.4 Class C applications . 11
5 Parameter testing methods for application . 11
5.1 Parameter tests . 11
5.1.1 General . 11
5.1.2 Actual energy capacity . 11
5.1.3 Roundtrip efficiency . 11
5.1.4 Step response time and ramp rate . 12
5.1.5 Auxiliary power consumption . 12
5.1.6 Self-discharge . 12
5.1.7 SOC . 12
5.2 Duty cycle performance tests . 12
5.2.1 General . 12
5.2.2 Duty cycle roundtrip efficiency . 12
5.2.3 Reference signal tracking . 12
5.3 Test items for each application . 14
6 Duty cycle for specific applications . 15
6.1 General . 15
6.2 Frequency control . 15
6.2.1 Frequency control duty cycle . 15
6.2.2 Primary/secondary/tertiary frequency control duty cycle . 16
6.2.3 Deviation control of frequency . 18
6.3 Fluctuation reduction of PV and wind farm . 20
6.4 Reactive-power voltage control . 22
6.5 Voltage sag mitigation . 23
6.6 Peak shaving . 26
6.6.1 “One charge-one discharge” mode . 26
6.6.2 “Two charges-two discharges” mode . 28

6.7 Renewable firming . 29
6.8 Islanded grid . 30
6.9 Back-up power . 32
6.9.1 General . 32
6.9.2 Grid outage test . 32
6.9.3 Step load test . 32
6.9.4 Unbalanced load test . 33
6.9.5 Function test . 33
6.9.6 Grid recovery test . 33
Annex A (normative)  Numerical data for duty cycle . 34
Bibliography . 66

Figure 1 – Frequency control duty cycle . 16
Figure 2 – Primary frequency control signal – 24 h duty cycle with 30 s discharge
every half hour shown over a) 24 h and b) 2 h . 17
Figure 3 – Secondary frequency control signal – 24 h duty cycle with 20 min discharge
every hour shown over a) 24 h and b) 3 h . 18
Figure 4 – Example of droop active power frequency control with a dead band . 19
Figure 5 – Duty cycle of fluctuation reduction of PV (photovoltaic energy systems) . 20
Figure 6 – Duty cycle of fluctuation reduction of wind farm . 21
Figure 7 – Duty cycle of fluctuation reduction of wind farm (low standard deviation) . 21
Figure 8 – Duty cycle of fluctuation reduction of wind farm (average standard
deviation) . 22
Figure 9 – Duty cycle of fluctuation reduction of wind farm (high standard deviation) . 22
Figure 10 – Reactive-power voltage control test profile . 23
Figure 11 – Voltage sag mitigation test profile (test level: 80 %) . 24
Figure 12 – Voltage sag mitigation test profile (test level: 70 %) . 25
Figure 13 – Voltage sag mitigation test profile (test level: 40 %) . 25
Figure 14 – Voltage sag mitigation test profile (test level: 0 %) . 26
Figure 15 – Duty cycle for peak shaving application of “one charge-one discharge”
mode . 28
Figure 16 – Duty cycle for peak shaving of “two charges-two discharges” mode . 29
Figure 17 – Duty cycle for renewable firming mode . 30
Figure 18 – Duty cycle for fluctuation reduction of renewable energy sources (power)
and frequency control . 31
Figure 19 – Duty cycle for fluctuation reduction of renewable energy sources (power)
without frequency control . 31
Figure 20 – Duty cycle without fluctuation reduction of renewable energy sources
(power) or frequency control . 32

Table 1 – Test items for each application . 15
Table 2 – Reactive-power voltage control test profile . 23
Table A.1 – Numerical data of Figure 1 (duty cycle of frequency control ) . 35
Table A.2 – Numerical data of Figure 5 (duty cycle of fluctuation reduction of PV
(photovoltaic energy systems) ) . 40
Table A.3 – Numerical data of Figure 7 (duty cycle of fluctuation reduction of wind
farm (low standard deviation)) . 44

– 4 – IEC TS 62933-2-2:2022 © IEC 2022
Table A.4 – Numerical data of Figure 8 (duty cycle of fluctuation reduction of wind
farm (average standard deviation)) . 45
Table A.5 – Numerical data of Figure 9 (duty cycle of fluctuation reduction of wind

farm (high standard deviation)) . 46
Table A.6 – Numerical data of Figure 17 (duty cycle for renewable firming mode) . 47
Table A.7 – Numerical data of Figure 18 (duty cycle for fluctuation reduction of
renewable energy sources (power) and frequency control) .
...