This document provides a test procedure for evaluating the performance of Under Voltage Ride-Through (UVRT) functions in inverters used in utility-interconnected Photovoltaic (PV) systems.<\/p>\n
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.<\/p>\n
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.<\/p>\n
The measurement procedures are designed to be as non-site-specific as possible, so that UVRT characteristics measured at one test site, for example, can also be considered valid at other sites.<\/p>\n
This document 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.<\/p>\n
| PDF Pages<\/th>\n | PDF Title<\/th>\n<\/tr>\n | ||||||
|---|---|---|---|---|---|---|---|
| 2<\/td>\n | undefined <\/td>\n<\/tr>\n | ||||||
| 4<\/td>\n | CONTENTS <\/td>\n<\/tr>\n | ||||||
| 6<\/td>\n | FOREWORD <\/td>\n<\/tr>\n | ||||||
| 9<\/td>\n | 1 Scope 2 Normative references 3 Terms, definitions, symbols and abbreviated terms 3.1 Terms, definitions and symbols <\/td>\n<\/tr>\n | ||||||
| 11<\/td>\n | 3.2 Abbreviated terms <\/td>\n<\/tr>\n | ||||||
| 12<\/td>\n | 4 Test circuit and equipment 4.1 General 4.2 Test circuit 4.3 Test equipment 4.3.1 Measuring instruments Figures Figure 1 \u2013 Testing circuit diagram <\/td>\n<\/tr>\n | ||||||
| 13<\/td>\n | 4.3.2 DC source 4.3.3 Short-circuit emulator Tables Table 1 \u2013 Accuracy of measurements <\/td>\n<\/tr>\n | ||||||
| 14<\/td>\n | Figure 2 \u2013 Short-circuit emulator <\/td>\n<\/tr>\n | ||||||
| 15<\/td>\n | Table 2 \u2013 Fault type and switch status <\/td>\n<\/tr>\n | ||||||
| 16<\/td>\n | 4.3.4 Converter based grid simulator 5 Test 5.1 Test protocol Figure 3 \u2013 Converter device example <\/td>\n<\/tr>\n | ||||||
| 17<\/td>\n | Table 3 \u2013 Test specification for UVRT (Indicative) <\/td>\n<\/tr>\n | ||||||
| 18<\/td>\n | 5.2 Test curve Figure 4 \u2013 UVRT curve example <\/td>\n<\/tr>\n | ||||||
| 19<\/td>\n | 5.3 Test procedure 5.3.1 Pre-test 5.3.2 No-load test 5.3.3 Tolerance 5.3.4 Load test Figure 5 \u2013 Tolerance of voltage drop <\/td>\n<\/tr>\n | ||||||
| 20<\/td>\n | 6 Assessment criteria <\/td>\n<\/tr>\n | ||||||
| 21<\/td>\n | Annex A (informative) Circuit faults and voltage drops A.1 Fault types Table A.1 \u2013 Short-circuit paths for different fault types <\/td>\n<\/tr>\n | ||||||
| 23<\/td>\n | A.2 Voltage drops A.2.1 General Figure A.1 \u2013 Grid fault diagram <\/td>\n<\/tr>\n | ||||||
| 24<\/td>\n | A.2.2 Three-phase short-circuit fault A.2.3 Two-phase short-circuit fault with ground Figure A.2 \u2013 Diagram of voltage vector for three-phase short-circuit fault Table A.2 \u2013 Amplitude and phase changes in three-phase short-circuit fault <\/td>\n<\/tr>\n | ||||||
| 25<\/td>\n | A.2.4 Two-phase short-circuit fault without ground Figure A.3 \u2013 Diagram of voltage vector of two-phase (BC) short-circuit fault with ground Table A.3 \u2013 Amplitude and phase changes in two-phase (BC) <\/td>\n<\/tr>\n | ||||||
| 26<\/td>\n | A.2.5 Single-phase short-circuit fault with ground Figure A.4 \u2013 Diagram of voltage vector of two-phase (BC) short-circuit fault Table A.4 \u2013 Amplitude and phase changes in two-phase (BC) short-circuit fault <\/td>\n<\/tr>\n | ||||||
| 27<\/td>\n | Figure A.5 \u2013 Diagram of voltage vector of single-phase (A) short-circuit fault with ground Table A.5 \u2013 Amplitude and phase changes in single-phase (A) <\/td>\n<\/tr>\n | ||||||
| 28<\/td>\n | Annex B (informative) Determination of critical performance values in UVRT testing B.1 General B.2 Drop depth ratio B.3 Ride-through time B.4 Reactive current <\/td>\n<\/tr>\n | ||||||
| 29<\/td>\n | B.5 Active power Figure B.1 \u2013 Determination of reactive current output Figure B.2 \u2013 Determination of active power recovery <\/td>\n<\/tr>\n | ||||||
| 30<\/td>\n | Annex C (informative) Requirements of the UVRT curve C.1 General C.2 UVRT curve C.3 Test points Figure C.1 \u2013 The typical curve of UVRT <\/td>\n<\/tr>\n | ||||||
| 31<\/td>\n | Bibliography <\/td>\n<\/tr>\n<\/table>\n","protected":false},"excerpt":{"rendered":" Utility-interconnected photovoltaic inverters. Test procedure for under voltage ride-through measurements<\/b><\/p>\n |