IEC TS 62910:2020

IEC TS 62910 ®
Edition 2.0 2020-07
TECHNICAL
SPECIFICATION
colour
inside
Utility-interconnected photovoltaic inverters – Test procedure for under voltage
ride-through measurements
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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
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