{
  "$type": "site.standard.document",
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  "description": "A power grid monitoring system includes a storage unit that stores power control system (PCS) impedance data indicative of a PCS impedance that is an impedance of a PCS-based energy source at a plurality of operation points, the PCS-based energy source being connected to an electric power system…",
  "path": "/patents/1370330",
  "publishedAt": "2024-10-17T00:00:00.000Z",
  "site": "at://did:plc:oql6ds5vnff4ugar6rruliwd/site.standard.publication/3mn3ohu7oxx5w",
  "tags": [
    "H02J3/241",
    "Hitachi, Ltd."
  ],
  "textContent": "A power grid monitoring system includes a storage unit that stores power control system (PCS) impedance data indicative of a PCS impedance that is an impedance of a PCS-based energy source at a plurality of operation points, the PCS-based energy source being connected to an electric power system, the PCS-based energy source including a voltage source and a PCS that regulates power generated by the voltage source and supplies the power to the electric power system, a real time calculation unit that calculates a power grid impedance based on a power flow measured at a point of connection where the PCS-based energy source and the electric power system are connected to each other, the power grid impedance being an impedance of the electric power system, and a stability check unit that performs a stability check to detect low frequency oscillation (LFO) at the point of connection based on the PCS impedance data and the power grid impedance.",
  "title": "Power Grid Monitoring System and Power Grid Monitoring Method"
}