{
  "$type": "site.standard.document",
  "description": "Synchronizing a grid side harmonic filter and pre-charging cell capacitors in modular multilevel converters can be achieved by: opening a transmission circuit breaker disposed on a first path between a power grid and a converter system; closing a pre-charging contactor disposed on a second path…",
  "path": "/patents/1330058",
  "publishedAt": "2022-10-20T00:00:00.000Z",
  "site": "at://did:plc:oql6ds5vnff4ugar6rruliwd/site.standard.publication/3mn3ohu7oxx5w",
  "tags": [
    "H02M1/126",
    "VESTAS WIND SYSTEMS A/S"
  ],
  "textContent": "Synchronizing a grid side harmonic filter and pre-charging cell capacitors in modular multilevel converters can be achieved by: opening a transmission circuit breaker disposed on a first path between a power grid and a converter system; closing a pre-charging contactor disposed on a second path between the power grid and the converter system that includes a set of pre-charge resistors; connecting the power grid to the converter system and the harmonic filter over the second path; selectively charging cell capacitors in the converter system until a charge threshold is reached, wherein a smaller subset of the cell capacitors is charged at a given time than in an earlier time, and each cell capacitor is charged to a higher cell voltage than in the earlier time; and closing the transmission circuit breaker and connecting a generator to the converter system via a generator circuit breaker while leaving the pre-charging contactor closed.",
  "title": "SYNCHRONIZING GRID SIDE HARMONIC FILTER AND PRE-CHARGING CELL CAPACITORS IN MODULAR MULTILEVEL CONVERTERS"
}