{
  "$type": "site.standard.document",
  "description": "A method and an apparatus implementing the method for an arrangement comprising a three-phase, multi-level invertern (11), an output LCL-filter (12) connecting the inverter to a grid (13), and a virtual-ground connection between the LCL-filter and the neutral point of the DC-link (l,m). The method…",
  "path": "/patents/980952",
  "publishedAt": "2013-12-11T00:00:00.000Z",
  "site": "at://did:plc:oql6ds5vnff4ugar6rruliwd/site.standard.publication/3mn3ohu7oxx5w",
  "tags": [
    "H02M7/42",
    "ABB RESEARCH LTD [CH]"
  ],
  "textContent": "A method and an apparatus implementing the method for an arrangement comprising a three-phase, multi-level invertern (11), an output LCL-filter (12) connecting the inverter to a grid (13), and a virtual-ground connection between the LCL-filter and the neutral point of the DC-link (l,m). The method comprises determining a zero-sequence component of an LCL-filter inverter-side current (i), calculating a zero-sequence damping and balancing voltage term (e*) on the basis of the LCL-filter inverter-side current zero-sequence component and voltages over the two halves of the DC-link (v, v), and adding the zero-sequence damping and voltage balancing term to the output voltage reference (e*).",
  "title": "Method for zero-sequence damping and voltage balancing in a three-level converter with split dc-link capacitors and virtually grounded LCL filter"
}