IEC TS 62910:2015

IEC TS 62910 ®
Edition 1.0 2015-10
TECHNICAL
SPECIFICATION
colour
inside
Utility-interconnected photovoltaic inverters – Test procedure for low voltage
ride-through measurements
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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
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