{
  "$type": "site.standard.document",
  "description": "The present invention provides a fault current limiting method in combination with a bridge-arm current suppression for VSC-HVDC, including: extracting an equivalent resistance, an equivalent inductance and an equivalent capacitance of a converter, an inductance value of a DC smoothing reactor, a…",
  "path": "/patents/1411971",
  "publishedAt": "2022-12-07T00:00:00.000Z",
  "site": "at://did:plc:oql6ds5vnff4ugar6rruliwd/site.standard.publication/3mn3ohu7oxx5w",
  "tags": [
    "H02H7/268",
    "UNIV SICHUAN [CN]"
  ],
  "textContent": "The present invention provides a fault current limiting method in combination with a bridge-arm current suppression for VSC-HVDC, including: extracting an equivalent resistance, an equivalent inductance and an equivalent capacitance of a converter, an inductance value of a DC smoothing reactor, a rated DC voltage, a proportional parameter and an integral parameter of a current inner loop proportional-integral (PI) controller; setting a corner frequency of the DC current suppression control according to a fault current suppression requirement, and calculating a switching coefficient of the converter; in an inner loop current control stage, adding bridge-arm current suppression control; unlocking a converter station; setting a DC pole-to-pole fault to occur; when a rising rate of the DC current is detected to exceed UdcN /2Ldc , triggering the DC suppression control, and changing the initial switching coefficient of the converter to the calculated adaptive switching coefficient Kc, and meanwhile, adding the bridge-arm current suppression control. The present invention realizes the purpose of limiting the DC fault current, and reducing the requirement for the breaking capacity of the DC circuit breaker, while also preventing the converter from being blocked before the action of the DC circuit breaker to ensure that the transmission of the active power will not be interrupted during the fault.",
  "title": "FAULT CURRENT LIMITING METHOD IN COMBINATION WITH BRIDGE-ARM CURRENT SUPPRESSION FOR VSC-HVDC"
}