This Technical Specification provides a test procedure for evaluating the performance of Low Voltage Ride-Through (LVRT) functions in inverters used in utility-interconnected PV systems.<\/p>\n
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.<\/p>\n
The assessed LVRT 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 LVRT response to behave differently.<\/p>\n
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.<\/p>\n
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.<\/p>\n
| PDF Pages<\/th>\n | PDF Title<\/th>\n<\/tr>\n | ||||||
|---|---|---|---|---|---|---|---|
| 4<\/td>\n | CONTENTS <\/td>\n<\/tr>\n | ||||||
| 6<\/td>\n | FOREWORD <\/td>\n<\/tr>\n | ||||||
| 8<\/td>\n | 1 Scope 2 Normative references 3 Terms, definitions, symbols and abbreviations 3.1 Terms, definitions and symbols <\/td>\n<\/tr>\n | ||||||
| 10<\/td>\n | 3.2 Abbreviations <\/td>\n<\/tr>\n | ||||||
| 11<\/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 | ||||||
| 12<\/td>\n | 4.3.2 DC source 4.3.3 Short-circuit emulator Tables Table 1 \u2013 Accuracy of measurements <\/td>\n<\/tr>\n | ||||||
| 13<\/td>\n | Figure 2 \u2013 Short-circuit emulator <\/td>\n<\/tr>\n | ||||||
| 14<\/td>\n | Table 2 \u2013 Fault type and switch status <\/td>\n<\/tr>\n | ||||||
| 15<\/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 | ||||||
| 16<\/td>\n | Table 3 \u2013 Test specification for LVRT (indicative) (1 of 2) <\/td>\n<\/tr>\n | ||||||
| 17<\/td>\n | 5.2 Test curve <\/td>\n<\/tr>\n | ||||||
| 18<\/td>\n | 5.3 Test procedure 5.3.1 Pre-test 5.3.2 No-load test 5.3.3 Tolerance Figure 4 \u2013 LVRT curve example <\/td>\n<\/tr>\n | ||||||
| 19<\/td>\n | 5.3.4 Load test 6 Assessment criteria Figure 5 \u2013 Tolerance of voltage drop <\/td>\n<\/tr>\n | ||||||
| 20<\/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 | ||||||
| 22<\/td>\n | A.2 Voltage drops A.2.1 General A.2.2 Three-phase short-circuit fault Figure A.1 \u2013 Grid fault diagram Figure\u00a0A.2 \u2013 Diagram of voltage vector for three-phase short-circuit fault <\/td>\n<\/tr>\n | ||||||
| 23<\/td>\n | A.2.3 Two-phase short-circuit fault with ground Figure\u00a0A.3 \u2013 Diagram of voltage vector of two-phase (BC) short-circuit fault with ground Table A.2 \u2013 Amplitude and phase changes in three-phase short-circuit fault <\/td>\n<\/tr>\n | ||||||
| 24<\/td>\n | A.2.4 Two-phase short-circuit fault without ground Figure\u00a0A.4 \u2013 Diagram of voltage vector of two-phase (BC) short-circuit fault Table A.3 \u2013 Amplitude and phase changes in two-phase (BC) short-circuit fault with ground Table A.4 \u2013 Amplitude and phase changes in two-phase (BC) short-circuit fault <\/td>\n<\/tr>\n | ||||||
| 25<\/td>\n | A.2.5 Single-phase short-circuit fault with ground Figure\u00a0A.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) short-circuit fault with ground <\/td>\n<\/tr>\n | ||||||
| 26<\/td>\n | Annex B (informative) Determination of critical performance values in LVRT testing B.1 General B.2 Drop depth ratio B.3 Ride-through time B.4 Reactive current <\/td>\n<\/tr>\n | ||||||
| 27<\/td>\n | B.5 Active power Figure\u00a0B.1 \u2013 Determination of reactive current output Figure B.2 \u2013 Determination of active power recovery <\/td>\n<\/tr>\n | ||||||
| 28<\/td>\n | Bibliography <\/td>\n<\/tr>\n<\/table>\n","protected":false},"excerpt":{"rendered":" Utility-interconnected photovoltaic inverters. Test procedure for low voltage ride-through measurements<\/b><\/p>\n |