IEC TS 62910:2015

Utility-interconnected photovoltaic inverters - Test procedure for low voltage ride-through measurements

IEC TS 62910:2015(E) provides a test procedure for evaluating the performance of Low Voltage Ride-Through (LVRT) functions in inverters used in utility-interconnected PV systems. The technical specification is most applicable to large systems where PV inverters are connected to utility HV distribution systems. However, the applicable procedures may also be used for LV installations in locations where evolving LVRT requirements include such installations, e.g. single-phase or 3-phase systems. The measurement procedures are designed to be as non-site-specific as possible, so that LVRT characteristics measured at one test site, for example, can also be considered valid at other sites. This technical specification is for testing of PV inverters, though it contains information that may also be useful for testing of a complete PV power plant consisting of multiple inverters connected at a single point to the utility grid. It further provides a basis for utility-interconnected PV inverter numerical simulation and model validation.

General Information

• Status: Published
• Publication Date: 21-Oct-2015
• ICS: 01 - GENERALITIES. TERMINOLOGY. STANDARDIZATION. DOCUMENTATION
• ICS: 27.160 - Solar energy engineering
• Technical Committee: TC 82 - Solar photovoltaic energy systems
• Drafting Committee: WG 6 - TC 82/WG 6
• Current Stage: DELPUB - Deleted Publication
• Start Date: 02-Sep-2019
• Completion Date: 24-Jul-2020

Relations

• Revised: IEC TS 62910:2020 - Utility-interconnected photovoltaic inverters - Test procedure for under voltage ride-through measurements
• Effective Date: 05-Sep-2023

Standards Content (Sample)

IEC TS 62910 ®
Edition 1.0 2015-10
TECHNICAL
SPECIFICATION
colour
inside
Utility-interconnected photovoltaic inverters – Test procedure for low 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.: [phone]
3, rue de Varembé Fax: [phone]

CH-1211 Geneva 20 [e-mail]
Switzerland www.iec.ch
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 corrigenda or an amendment might have been published.

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documents. Available for PC, Mac OS, Android Tablets and additional languages. Also known as the International
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variety of criteria (reference number, text, technical English and French extracted from the Terms and Definitions
committee,…). It also gives information on projects, replaced clause of IEC publications issued since 2002. Some entries
and withdrawn publications. have been collected from earlier publications of IEC TC 37,

77, 86 and CISPR.
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details all new publications released. Available online and If you wish to give us your feedback on this publication or
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IEC TS 62910 ®
Edition 1.0 2015-10
TECHNICAL
SPECIFICATION
colour
inside
Utility-interconnected photovoltaic inverters – Test procedure for low voltage

ride-through measurements
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 27.160 ISBN 978-2-8322-2957-6

– 2 – IEC TS 62910:2015  IEC 2015

CONTENTS
FOREWORD . 4

1 Scope . 6

2 Normative references . 6

3 Terms, definitions, symbols and abbreviations . 6

3.1 Terms, definitions and symbols . 6

3.2 Abbreviations . 8

4 Test circuit and equipment . 9

4.1 General . 9
4.2 Test circuit . 9
4.3 Test equipment . 9
4.3.1 Measuring instruments. 9
4.3.2 DC source . 10
4.3.3 Short-circuit emulator . 10
4.3.4 Converter based grid simulator . 13
5 Test . 13
5.1 Test protocol . 13
5.2 Test curve . 15
5.3 Test procedure . 16
5.3.1 Pre-test . 16
5.3.2 No-load test . 16
5.3.3 Tolerance . 16
5.3.4 Load test . 17
6 Assessment criteria . 17
Annex A (informative) Circuit faults and voltage drops . 18
A.1 Fault types . 18
A.2 Voltage drops . 20
A.2.1 General . 20
A.2.2 Three-phase short-circuit fault . 20
A.2.3 Two-phase short-circuit fault with ground . 21
A.2.4 Two-phase short-circuit fault without ground . 22
A.2.5 Single-phase short-circuit fault with ground . 23
Annex B (informative) Determination of critical performance values in LVRT testing . 24

B.1 General . 24
B.2 Drop depth ratio . 24
B.3 Ride-through time . 24
B.4 Reactive current. 24
B.5 Active power . 25
Bibliography . 26

Figure 1 – Testing circuit diagram . 9
Figure 2 – Short-circuit emulator . 11
Figure 3 – Converter device example . 13
Figure 4 – LVRT curve example . 16
Figure 5 – Tolerance of voltage drop. 17

Figure A.1 – Grid fault diagram . 20

Figure A.2 – Diagram of voltage vector for three-phase short-circuit fault . 20

Figure A.3 – Diagram of voltage vector of two-phase (BC) short-circuit fault with

ground . 21

Figure A.4 – Diagram of voltage vector of two-phase (BC) short-circuit fault . 22

Figure A.5 – Diagram of voltage vector of single-phase (A) short-circuit fault with

ground . 23

Figure B.1 – Determination of reactive current output . 25

Figure B.2 – Determination of active power recovery . 25

Table 1 – Accuracy of measurements . 10
Table 2 – Fault type and switch status . 12
Table 3 – Test specification for LVRT (indicative) . 14
Table A.1 – Short-circuit paths for different fault types . 18
Table A.2 – Amplitude and phase changes in three-phase short-circuit fault . 21
Table A.3 – Amplitude and phase changes in two-phase (BC) short-circuit fault with
ground . 22
Table A.4 – Amplitude and phase changes in two-phase (BC) short-circuit fault . 22
Table A.5 – Amplitude and phase changes in single-phase (A) short-circuit fault with
ground . 23

– 4 – IEC TS 62910:2015  IEC 2015

INTERNATIONAL ELECTROTECHNICAL COMMISSION

____________
UTILITY-INTERCONNECTED PHOTOVOLTAIC INVERTERS –

TEST PROCEDURE FOR LOW 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
...

IEC TS 62910 ®
Edition 1.0 2015-10
TECHNICAL
SPECIFICATION
colour
inside
Utility-interconnected photovoltaic inverters – Test procedure for low 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.: [phone]
3, rue de Varembé Fax: [phone]
CH-1211 Geneva 20 [e-mail]
Switzerland www.iec.ch
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 corrigenda or an amendment might have been published.

IEC Catalogue - webstore.iec.ch/catalogue Electropedia - www.electropedia.org
The stand-alone application for consulting the entire The world's leading online dictionary of electronic and
bibliographical information on IEC International Standards, electrical terms containing more than 30 000 terms and
Technical Specifications, Technical Reports and other definitions in English and French, with equivalent terms in 15
documents. Available for PC, Mac OS, Android Tablets and additional languages. Also known as the International
iPad. Electrotechnical Vocabulary (IEV) online.

IEC publications search - www.iec.ch/searchpub IEC Glossary - std.iec.ch/glossary
The advanced search enables to find IEC publications by a More than 60 000 electrotechnical terminology entries in
variety of criteria (reference number, text, technical English and French extracted from the Terms and Definitions
committee,…). It also gives information on projects, replaced clause of IEC publications issued since 2002. Some entries
and withdrawn publications. have been collected from earlier publications of IEC TC 37,

77, 86 and CISPR.
IEC Just Published - webstore.iec.ch/justpublished

Stay up to date on all new IEC publications. Just Published IEC Customer Service Centre - webstore.iec.ch/csc
details all new publications released. Available online and If you wish to give us your feedback on this publication or
also once a month by email. need further assistance, please contact the Customer Service
Centre: [e-mail].
IEC TS 62910 ®
Edition 1.0 2015-10
TECHNICAL
SPECIFICATION
colour
inside
Utility-interconnected photovoltaic inverters – Test procedure for low voltage

ride-through measurements
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 27.160 ISBN 978-2-8322-2957-6

– 2 – IEC TS 62910:2015  IEC 2015
CONTENTS
FOREWORD . 4
1 Scope . 6
2 Normative references . 6
3 Terms, definitions, symbols and abbreviations . 6
3.1 Terms, definitions and symbols . 6
3.2 Abbreviations . 8
4 Test circuit and equipment . 9
4.1 General . 9
4.2 Test circuit . 9
4.3 Test equipment . 9
4.3.1 Measuring instruments. 9
4.3.2 DC source . 10
4.3.3 Short-circuit emulator . 10
4.3.4 Converter based grid simulator . 13
5 Test . 13
5.1 Test protocol . 13
5.2 Test curve . 15
5.3 Test procedure . 16
5.3.1 Pre-test . 16
5.3.2 No-load test . 16
5.3.3 Tolerance . 16
5.3.4 Load test . 17
6 Assessment criteria . 17
Annex A (informative) Circuit faults and voltage drops . 18
A.1 Fault types . 18
A.2 Voltage drops . 20
A.2.1 General . 20
A.2.2 Three-phase short-circuit fault . 20
A.2.3 Two-phase short-circuit fault with ground . 21
A.2.4 Two-phase short-circuit fault without ground . 22
A.2.5 Single-phase short-circuit fault with ground . 23
Annex B (informative) Determination of critical performance values in LVRT testing . 24
B.1 General . 24
B.2 Drop depth ratio . 24
B.3 Ride-through time . 24
B.4 Reactive current. 24
B.5 Active power . 25
Bibliography . 26

Figure 1 – Testing circuit diagram . 9
Figure 2 – Short-circuit emulator . 11
Figure 3 – Converter device example . 13
Figure 4 – LVRT curve example . 16
Figure 5 – Tolerance of voltage drop. 17

Figure A.1 – Grid fault diagram . 20
Figure A.2 – Diagram of voltage vector for three-phase short-circuit fault . 20
Figure A.3 – Diagram of voltage vector of two-phase (BC) short-circuit fault with
ground . 21
Figure A.4 – Diagram of voltage vector of two-phase (BC) short-circuit fault . 22
Figure A.5 – Diagram of voltage vector of single-phase (A) short-circuit fault with
ground . 23
Figure B.1 – Determination of reactive current output . 25
Figure B.2 – Determination of active power recovery . 25

Table 1 – Accuracy of measurements . 10
Table 2 – Fault type and switch status . 12
Table 3 – Test specification for LVRT (indicative) . 14
Table A.1 – Short-circuit paths for different fault types . 18
Table A.2 – Amplitude and phase changes in three-phase short-circuit fault . 21
Table A.3 – Amplitude and phase changes in two-phase (BC) short-circuit fault with
ground . 22
Table A.4 – Amplitude and phase changes in two-phase (BC) short-circuit fault . 22
Table A.5 – Amplitude and phase changes in single-phase (A) short-circuit fault with
ground . 23

– 4 – IEC TS 62910:2015  IEC 2015
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
UTILITY-INTERCONNECTED PHOTOVOLTAIC INVERTERS –
TEST PROCEDURE FOR LOW 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 Standards. In
exceptional circumstances, a technical committee may propose
...