IEC TR 61000-3-15:2011

Electromagnetic compatibility (EMC) - Part 3-15: Limits - Assessment of low frequency electromagnetic immunity and emission requirements for dispersed generation systems in LV network

IEC/TR 61000-3-15:2011(E) is concerned with the critical assessment of existing and emerging national and international standards for single and multi-phase dispersed generation systems up to 75 A per phase, particularly converters connected to the public supply low voltage network. This Technical Report intends to serve as a starting point and to ultimately pave the way for the definition of appropriate EMC requirements and test conditions. This Technical Report is limited to EMC issues (immunity and emission) up to 9 kHz and does not include other aspects of connection of generators to the grid. This Technical Report focuses on emission caused by distributed generation (mainly harmonics and inter-harmonics, DC emissions flicker, rapid voltage changes and fluctuations), as well as immunity aspects to normally occurring events in the public supply network (voltage dips and short interruptions, frequency variations, harmonics and interharmonics). Every effort has been made to utilize already existing emission and immunity standards, including the test set-up and existing test equipment in use.

General Information

• Status: Published
• Publication Date: 12-Sep-2011
• ICS: 01 - GENERALITIES. TERMINOLOGY. STANDARDIZATION. DOCUMENTATION
• ICS: 33.100.10 - Emission
• Technical Committee: SC 77A - EMC - Low frequency phenomena
• Drafting Committee: PT 61000-3-15 - TC 77/SC 77A/PT 61000-3-15
• Current Stage: PPUB - Publication issued
• Start Date: 15-Dec-2011
• Completion Date: 13-Sep-2011

Standards Content (Sample)

IEC/TR 61000-3-15 ®
Edition 1.0 2011-09
TECHNICAL
REPORT
colour
inside
Electromagnetic compatibility (EMC) –
Part 3-15: Limits – Assessment of low frequency electromagnetic immunity and
emission requirements for dispersed generation systems in LV network

IEC/TR 61000-3-15:2011(E)
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IEC/TR 61000-3-15 ®
Edition 1.0 2011-09
TECHNICAL
REPORT
colour
inside
Electromagnetic compatibility (EMC) –
Part 3-15: Limits – Assessment of low frequency electromagnetic immunity and
emission requirements for dispersed generation systems in LV network

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
PRICE CODE
X
ICS 33.100.10 ISBN 978-2-88912-636-1

– 2 – TR 61000-3-15  IEC:2011(E)
CONTENTS
FOREWORD . 4
INTRODUCTION . 6
1 Scope . 7
2 Terms and definitions . 7
3 General . 10
4 Classification of DG generators . 11
4.1 General . 11
4.2 Induction (asynchronous) generators . 11
4.3 Synchronous generators . 12
4.4 Static power converters . 12
5 Survey of EMC requirements for DG . 12
6 Proposed EMC requirements and tests . 15
6.1 General test requirements . 15
6.2 Proposed tests . 17
7 Emission . 18
7.1 General . 18
7.2 Harmonics . 18
7.2.1 Mechanisms of harmonic current emissions . 18
7.2.2 Proposed limits and tests for harmonic current emissions . 19
7.2.3 Summary of harmonic current emission tests . 21
7.2.4 Product test procedure for harmonic current emissions . 21
7.2.5 System test procedure for harmonic current emissions . 23
7.3 Unbalance . 23
7.4 Voltage fluctuation and flicker . 24
7.4.1 General . 24
7.4.2 Flicker test conditions for DG equipment exporting power to the
public supply . 25
7.5 DC injection. 26
7.6 Short duration over voltages . 26
7.6.1 General . 26
7.6.2 Short duration over voltage test procedure . 28
7.7 Switching frequencies . 29
8 Immunity . 30
8.1 General . 30
8.2 Voltage dips and short interruptions . 31
8.2.1 General . 31
8.2.2 Short duration voltage dips test procedure . 36
8.2.3 Longer duration voltage dips test procedure . 37
8.3 Frequency variations . 37
8.4 Harmonics and interharmonics . 39
Annex A (informative) Examples of harmonic measurements and analysis on DG
equipment connected to low voltage networks . 41
Bibliography . 46

TR 61000-3-15  IEC:2011(E) – 3 –
Figure 1 – General test setup for combined emission/immunity tests . 16
Figure 2 – Over voltages produced during DG quick disconnection . 27
Figure 3 – Over voltages produced during DG slow disconnection (greater than 10 ms) . 27
Figure 4 – CBEMA curve (IEC 61000-2-14) . 28
Figure 5 – Distortion due to high power PV inverter . 30
Figure 6 – Voltage dips and short interruption test levels from different standards . 32
Figure 7 – Voltage tolerance curves for DG immunity requirements . 33
Figure 8 – DG immunity test for short dips/interruptions: an example . 36
Figure 9 – Test pattern for a DG voltage dip tolerance curve . 36
Figure 10 – DG frequency variation (increment) immunity test: an example . 39
Figure A.1 – Total current distortion due the network and the connected inverter . 41
Figure A.2 – Harmonic distortions at different input power of a 5 kW inverter . 42
Figure A.3 – DG equipment with LCL filter . 42
Figure A.4 – Impedance model for DG equipment with LCL filter . 43
Figure A.5 – Voltage spectrum: four AICs connected . 44
Figure A.6 – Current harmonics: four AICs at 10 A r.m.s. (0,11 / ) . 44
N
Table 1 – DG specifications and emission requirements applied in different countries . 13
Table 2 – Proposed EMC requirements and tests for DG equipment . 17
Table 3 – Different suggested product and system tests for harmonic emissions . 21
Table 4 – Voltage distortion of simulated public supply (IEC 61000-3-2) . 22
Table 5 – Voltage distortion of simulated public supply (IEC 61000-3-12) . 22
Table 6 – Limits for DG up to 75 A/phase (in percent of I ) . 23
rms
Table 7 – Distortion values for a flat top and peaky voltage distortion V-THD of 4,0 % . 23
Table 8 – Protection requirements for PV inverters under voltage disturbances . 34
Table 9 – Protection requirements for PV inverters under frequency disturbances . 38
Table 10 – Harmonic voltage disturbance levels for odd harmonics (IEC 61000-4-13) . 40
Table A.1 – THD of increasing numbers of AICs with LCL filters connected to the
network . 43

– 4 – TR 61000-3-15  IEC:2011(E)
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
ELECTROMAGNETIC COMPATIBILITY (EMC) –

Part 3-15: Limits –
Assessment of low frequency electromagnetic immunity and emission
requirements for dispersed generation systems in LV network

FOREWORD
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