{
  "$type": "site.standard.document",
  "description": "Apparatus and method for determining islanding of a system are provided. The method includes: calculating an amount of reactive power injection based on an active power command and reactive power command received from an upper controller of the distributed power; setting a failure confirmation…",
  "path": "/patents/1387713",
  "publishedAt": "2026-03-11T00:00:00.000Z",
  "site": "at://did:plc:oql6ds5vnff4ugar6rruliwd/site.standard.publication/3mn3ohu7oxx5w",
  "tags": [
    "G01R19/02",
    "HYUNDAI MOBIS CO LTD [KR]"
  ],
  "textContent": "Apparatus and method for determining islanding of a system are provided. The method includes: calculating an amount of reactive power injection based on an active power command and reactive power command received from an upper controller of the distributed power; setting a failure confirmation count to 0; controlling injection of reactive power during a preset cycle among predetermined cycles of an AC voltage that is an output of the distributed power according to the failure confirmation count; measuring a frequency and angular frequency of the AC voltage, which is performed simultaneously with the injection of reactive power; and after the injection of reactive power is completed, increasing the failure confirmation count if a determination criteria based on the measurement of the frequency and the angular frequency of the AC voltage; and determining an islanding failure when the failure confirmation count reaches a preset value.",
  "title": "APPARATUS AND ISLANDING DETERMINATION METHOD FOR GRID DISTURBANCE"
}