STAND-ALONE AND GRID-CONNECTED COMPATIBLE INVERTER SYSTEM FOR SUPPORTING THE RESTORATION OF GRID POWER AND OPERATION METHOD THEREOF

摘要

Independent and grid-compatible inverter systems supporting power failure protection mode are provided. The inverter system includes a first current sensor sensing at least a portion of a grid current flowing from an AC grid power source to a first output node, and sensing an inductor current flowing from an inductor having one end connected to a second output node to the second output node. to at least one of a second current sensor, a voltage sensor sensing an output voltage between both ends of the second output node and the third output node, and a grid sensing current sensed by the first current sensor, the inductor current, and the output voltage. The inverter system may include a processor that determines an operation mode to operate as any one of a standalone power supply, a grid-connected power supply, and an uninterruptible power supply (UPS) based on the inverter system.