{
  "$type": "site.standard.document",
  "description": "This application describes methods and apparatus for HVDC power distribution. A control apparatus (108) is described for controlling a frequency set-point for a first AC network (104) electrically connected to a first HVDC station (101) to regulate active power. The controller has a frequency…",
  "path": "/patents/1420426",
  "publishedAt": "2025-06-18T00:00:00.000Z",
  "site": "at://did:plc:oql6ds5vnff4ugar6rruliwd/site.standard.publication/3mn3ohu7oxx5w",
  "tags": [
    "H02J3/36",
    "GENERAL ELECTRIC TECHNOLOGY GMBH [CH]"
  ],
  "textContent": "This application describes methods and apparatus for HVDC power distribution. A control apparatus (108) is described for controlling a frequency set-point for a first AC network (104) electrically connected to a first HVDC station (101) to regulate active power. The controller has a frequency controller (501) operable in a first mode of operation to determine a frequency set-point (Fref) for the first AC network (104) based on a measured DC voltage (V) at the first HVDC station. A disturbance detector (601) is configured to monitor the measured value of DC voltage at the first HVDC station (V) for a predetermined characteristic indicative that a variation in measured DC voltage does correspond to a known modulation applied to the DC voltage by a second HVDC station (102). The frequency controller is configured to determine the frequency set-point (Fref) for the first AC network (104) based on a measured value of DC voltage (V) if said predetermined characteristic is detected, and to control the frequency set-point to a predetermined default frequency if said predetermined characteristic is not detected.",
  "title": "HVDC POWER TRANSMISSION"
}