IEC TS 62910:2020
(Main)Utility-interconnected photovoltaic inverters - Test procedure for under voltage ride-through measurements
Utility-interconnected photovoltaic inverters - Test procedure for under voltage ride-through measurements
IEC TS 62910:2020 provides a test procedure for evaluating the performance of Under Voltage Ride-Through (UVRT) functions in inverters used in utility-interconnected Photovoltaic (PV) systems. This document is most applicable to large systems where PV inverters are connected to utility high voltage (HV) distribution systems. However, the applicable procedures may also be used for low voltage (LV) installations in locations where evolving UVRT requirements include such installations, e.g. single-phase or 3-phase systems. The assessed UVRT performance is valid only for the specific configuration and operational mode of the inverter under test. Separate assessment is required for the inverter in other factory or user-settable configurations, as these may cause the inverter UVRT response to behave differently. This second edition cancels and replaces the first edition issued in 2015 and constitutes a technical revision.
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IEC TS 62910 ®
Edition 2.0 2020-07
TECHNICAL
SPECIFICATION
colour
inside
Utility-interconnected photovoltaic inverters – Test procedure for under voltage
ride-through measurements
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form
or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from
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copyright or have an enquiry about obtaining additional rights to this publication, please contact the address below or
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3, rue de Varembé info@iec.ch
CH-1211 Geneva 20 www.iec.ch
Switzerland
About the IEC
The International Electrotechnical Commission (IEC) is the leading global organization that prepares and publishes
International Standards for all electrical, electronic and related technologies.
About IEC publications
The technical content of IEC publications is kept under constant review by the IEC. Please make sure that you have the
latest edition, a corrigendum or an amendment might have been published.
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and withdrawn publications. Also known as the International Electrotechnical Vocabulary
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IEC TS 62910 ®
Edition 2.0 2020-07
TECHNICAL
SPECIFICATION
colour
inside
Utility-interconnected photovoltaic inverters – Test procedure for under voltage
ride-through measurements
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 27.160 ISBN 978-2-8322-8383-7
– 2 – IEC TS 62910:2020 © IEC 2020
CONTENTS
FOREWORD . 4
1 Scope . 7
2 Normative references . 7
3 Terms, definitions, symbols and abbreviated terms . 7
3.1 Terms, definitions and symbols . 7
3.2 Abbreviated terms . 9
4 Test circuit and equipment . 10
4.1 General . 10
4.2 Test circuit . 10
4.3 Test equipment . 10
4.3.1 Measuring instruments. 10
4.3.2 DC source . 11
4.3.3 Short-circuit emulator . 11
4.3.4 Converter based grid simulator . 14
5 Test . 14
5.1 Test protocol . 14
5.2 Test curve . 16
5.3 Test procedure . 17
5.3.1 Pre-test . 17
5.3.2 No-load test . 17
5.3.3 Tolerance . 17
5.3.4 Load test . 17
6 Assessment criteria . 18
Annex A (informative) Circuit faults and voltage drops . 19
A.1 Fault types . 19
A.2 Voltage drops . 21
A.2.1 General . 21
A.2.2 Three-phase short-circuit fault . 22
A.2.3 Two-phase short-circuit fault with ground . 22
A.2.4 Two-phase short-circuit fault without ground . 23
A.2.5 Single-phase short-circuit fault with ground . 24
Annex B (informative) Determination of critical performance values in UVRT testing . 26
B.1 General . 26
B.2 Drop depth ratio . 26
B.3 Ride-through time . 26
B.4 Reactive current. 26
B.5 Active power . 27
Annex C (informative) Requirements of the UVRT curve . 28
C.1 General . 28
C.2 UVRT curve . 28
C.3 Test points . 28
Bibliography . 29
Figure 1 – Testing circuit diagram . 10
Figure 2 – Short-circuit emulator . 12
Figure 3 – Converter device example . 14
Figure 4 – UVRT curve example . 16
Figure 5 – Tolerance of voltage drop. 17
Figure A.1 – Grid fault diagram . 21
Figure A.2 – Diagram of voltage vector for three-phase short-circuit fault . 22
Figure A.3 – Diagram of voltage vector of two-phase (BC) short-circuit fault with
ground . 23
Figure A.4 – Diagram of voltage vector of two-phase (BC) short-circuit fault . 24
Figure A.5 – Diagram of voltage vector of single-phase (A) short-circuit fault with
ground . 25
Figure B.1 – Determination of reactive current output . 27
Figure B.2 – Determination of active power recovery . 27
Figure C.1 – The typical curve of UVRT . 28
Table 1 – Accuracy of measurements . 11
Table 2 – Fault type and switch status . 13
Table 3 – Test specification for UVRT (Indicative) . 15
Table A.1 – Short-circuit paths for different fault types . 19
Table A.2 – Amplitude and phase changes in three-phase short-circuit fault . 22
Table A.3 – Amplitude and phase changes in two-phase (BC) . 23
Table A.4 – Amplitude and phase changes in two-phase (BC) short-circuit fault . 24
Table A.5 – Amplitude and phase changes in single-phase (A) . 25
– 4 – IEC TS 62910:2020 © IEC 2020
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
UTILITY-INTERCONNECTED PHOTOVOLTAIC INVERTERS –
TEST PROCEDURE FOR UNDER VOLTAGE
RIDE-THROUGH MEASUREMENTS
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 entrusted to technical committees; any IEC National Committee interested
in the subject dealt with may participate in this preparatory work. International, governmental and non-
governmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closely
with the International Organization for Standardization (ISO) in accordance with conditions determined by
agreement between the two organizations.
2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
consensus of opinion on the relevant subjects since each technical committee has representation from all
interested IEC National Committees.
3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC
Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
misinterpretation by any end user.
4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
transparently to the maximum extent possible in their national and regional publications. Any divergence
between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in
the latter.
5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity
assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any
services carried out by independent certification bodies.
6) All users should ensure that they have the latest edition of this publication.
7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
members of its technical committees and IEC National Committees for any personal injury, property damage or
other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and
expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC
Publications.
8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
indispensable for the correct application of this publication.
9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of
patent rights. IEC shall not be held responsible for identifying any or all such patent rights.
The main task of IEC technical committees is to prepare International Standard
...
IEC TS 62910 ®
Edition 2.0 2020-07
REDLINE VERSION
TECHNICAL
SPECIFICATION
colour
inside
Utility-interconnected photovoltaic inverters – Test procedure for low under
voltage ride-through measurements
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form
or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from
either IEC or IEC's member National Committee in the country of the requester. If you have any questions about IEC
copyright or have an enquiry about obtaining additional rights to this publication, please contact the address below or
your local IEC member National Committee for further information.
IEC Central Office Tel.: +41 22 919 02 11
3, rue de Varembé info@iec.ch
CH-1211 Geneva 20 www.iec.ch
Switzerland
About the IEC
The International Electrotechnical Commission (IEC) is the leading global organization that prepares and publishes
International Standards for all electrical, electronic and related technologies.
About IEC publications
The technical content of IEC publications is kept under constant review by the IEC. Please make sure that you have the
latest edition, a corrigendum or an amendment might have been published.
IEC publications search - webstore.iec.ch/advsearchform Electropedia - www.electropedia.org
The advanced search enables to find IEC publications by a The world's leading online dictionary on electrotechnology,
variety of criteria (reference number, text, technical containing more than 22 000 terminological entries in English
committee,…). It also gives information on projects, replaced and French, with equivalent terms in 16 additional languages.
and withdrawn publications. Also known as the International Electrotechnical Vocabulary
(IEV) online.
IEC Just Published - webstore.iec.ch/justpublished
Stay up to date on all new IEC publications. Just Published IEC Glossary - std.iec.ch/glossary
details all new publications released. Available online and 67 000 electrotechnical terminology entries in English and
once a month by email. French extracted from the Terms and Definitions clause of
IEC publications issued since 2002. Some entries have been
IEC Customer Service Centre - webstore.iec.ch/csc collected from earlier publications of IEC TC 37, 77, 86 and
If you wish to give us your feedback on this publication or CISPR.
need further assistance, please contact the Customer Service
Centre: sales@iec.ch.
IEC TS 62910 ®
Edition 2.0 2020-07
REDLINE VERSION
TECHNICAL
SPECIFICATION
colour
inside
Utility-interconnected photovoltaic inverters – Test procedure for low under
voltage ride-through measurements
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 27.160 ISBN 978-2-8322-8736-1
– 2 – IEC TS 62910:2020 RLV © IEC 2020
CONTENTS
FOREWORD . 4
1 Scope . 7
2 Normative references . 7
3 Terms, definitions, symbols and abbreviated terms . 7
3.1 Terms, definitions and symbols . 7
3.2 Abbreviated terms . 10
4 Test circuit and equipment . 10
4.1 General . 10
4.2 Test circuit . 10
4.3 Test equipment . 11
4.3.1 Measuring instruments. 11
4.3.2 DC source . 11
4.3.3 Short-circuit emulator . 11
4.3.4 Converter based grid simulator . 14
5 Test . 14
5.1 Test protocol . 14
5.2 Test curve . 16
5.3 Test procedure . 17
5.3.1 Pre-test . 17
5.3.2 No-load test . 17
5.3.3 Tolerance . 17
5.3.4 Load test . 17
6 Assessment criteria . 18
Annex A (informative) Circuit faults and voltage drops . 19
A.1 Fault types . 19
A.2 Voltage drops . 21
A.2.1 General . 21
A.2.2 Three-phase short-circuit fault . 22
A.2.3 Two-phase short-circuit fault with ground . 22
A.2.4 Two-phase short-circuit fault without ground . 23
A.2.5 Single-phase short-circuit fault with ground . 24
Annex B (informative) Determination of critical performance values in LVRT UVRT
testing . 26
B.1 General . 26
B.2 Drop depth ratio . 26
B.3 Ride-through time . 26
B.4 Reactive current. 26
B.5 Active power . 27
Annex C (informative) Requirements of the UVRT curve . 28
C.1 General . 28
C.2 UVRT curve . 28
C.3 Test points . 28
Bibliography . 29
Figure 1 – Testing circuit diagram . 10
Figure 2 – Short-circuit emulator . 12
Figure 3 – Converter device example . 14
Figure 4 – LVRT UVRT curve example . 16
Figure 5 – Tolerance of voltage drop. 17
Figure A.1 – Grid fault diagram . 21
Figure A.2 – Diagram of voltage vector for three-phase short-circuit fault . 22
Figure A.3 – Diagram of voltage vector of two-phase (BC) short-circuit fault with
ground . 23
Figure A.4 – Diagram of voltage vector of two-phase (BC) short-circuit fault . 24
Figure A.5 – Diagram of voltage vector of single-phase (A) short-circuit fault with
ground . 25
Figure B.1 – Determination of reactive current output . 27
Figure B.2 – Determination of active power recovery . 27
Figure C.1 – The typical curve of UVRT . 28
Table 1 – Accuracy of measurements . 11
Table 2 – Fault type and switch status . 13
Table 3 – Test specification for LVRT UVRT (Indicative) . 15
Table A.1 – Short-circuit paths for different fault types . 19
Table A.2 – Amplitude and phase changes in three-phase short-circuit fault . 22
Table A.3 – Amplitude and phase changes in two-phase (BC)
short-circuit fault with ground . 23
Table A.4 – Amplitude and phase changes in two-phase (BC) short-circuit fault . 24
Table A.5 – Amplitude and phase changes in single-phase (A) short-circuit fault with
ground . 25
– 4 – IEC TS 62910:2020 RLV © IEC 2020
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
UTILITY-INTERCONNECTED PHOTOVOLTAIC INVERTERS –
TEST PROCEDURE FOR LOW UNDER VOLTAGE
RIDE-THROUGH MEASUREMENTS
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 entrusted to technical committees; any IEC National Committee interested
in the subject dealt with may participate in this preparatory work. International, governmental and non-
governmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closely
with the International Organization for Standardization (ISO) in accordance with conditions determined by
agreement between the two organizations.
2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
consensus of opinion on the relevant subjects since each technical committee has representation from all
interested IEC National Committees.
3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC
Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
misinterpretation by any end user.
4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
transparently to the maximum extent possible in their national and regional publications. Any divergence
between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in
the latter.
5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity
assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any
services carried out by independent certification bodies.
6) All users should ensure that they have the latest edition of this publication.
7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
members of its technical committees and IEC National Committees for any personal injury, property damage or
other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and
expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC
Publications.
8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publication
...
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