UL 1741: Inverter testing, Converters, Controllers and Interconnection System Equipment for Use With
UL1741 is an inverter testing standard from the UL global safety science organization that aims to ensure power system performance and grid support functionality.
1.1 The UL1741 inverter testing requirements cover inverters, converters, charge controllers, and interconnection system equipment (ISE) intended for use in stand-alone (not grid-connected) or utility-interactive (grid-connected) power systems. Utility-interactive inverters, converters, and ISE are intended to be operated in parallel with an electric power system (EPS) to supply power to common loads.
1.2 For utility-interactive equipment, the UL1741 inverter testing requirements are intended to supplement and be used in conjunction with the Standard for Interconnecting Distributed Resources With Electric Power Systems, IEEE 1547, and the Standard for Conformance Test Procedures for Equipment Interconnecting Distributed Resources with Electric Power Systems, IEEE 1547.1.
1.3 The UL1741 inverter testing requirements cover AC modules that combine flat-plate photovoltaic modules and inverters to provide AC output power for stand-alone use or utility interaction, and power systems that combine other alternative energy sources with inverters, converters, charge controllers, and interconnection system equipment (ISE), in system specific combinations.
1.4 The UL1741 inverter testing requirements also cover power systems that combine independent power sources with inverters, converters, charge controllers, and interconnection system equipment (ISE) in system-specific combinations.
1.5 The products covered by the UL1741 inverter testing requirements are intended to be installed in accordance with the National Electrical Code, NFPA 70.
User-defined waveforms permit the generation of non-sinusoidal voltages: asymmetrical inflections, transient anomalies, voltage harmonics
Equipment for Inverter Testing
Grid Simulators are the most common equipment for UL1741