{
  "$type": "site.standard.document",
  "description": "The invention belongs to the technical field of a power supply, and particularly relates to the technical field of a high-power power-frequency uninterruptible power supply (UPS), in particular to a symmetric-type UPS power system based on a nine-phase phase-shifting autotransformer (1); the…",
  "path": "/patents/978184",
  "publishedAt": "2014-02-26T00:00:00.000Z",
  "site": "at://did:plc:oql6ds5vnff4ugar6rruliwd/site.standard.publication/3mn3ohu7oxx5w",
  "tags": [
    "H01F30/12",
    "GUANGDONG EAST POWER CO LTD [CN]"
  ],
  "textContent": "The invention belongs to the technical field of a power supply, and particularly relates to the technical field of a high-power power-frequency uninterruptible power supply (UPS), in particular to a symmetric-type UPS power system based on a nine-phase phase-shifting autotransformer (1); the symmetric-type UPS power system includes a three-phase AC power input terminal, a three-phase AC power output terminal (18), a nine-phase phase-shift autotransformer (1), a synchronized control device for controlling output of a three-phase inverter, a power-frequency isolation transformer and three circuits of output devices; wherein a three-phase AC input terminal of the nine-phase phase-shifting autotransformer (1) is connected to the three-phase AC power input terminal, each circuit of the output devices includes a zero-sequence suppression commutating inductor, a three-phase six-pulse rectifier, a three-phase inverter and a filter inductor which are connected with each other in sequence, each circuit of the zero-sequence suppression commutating inductor (2) is connected to the three-phase AC output terminal of the phase-shifting autotransformer (1), each circuit of the filter inductor is connected to the input terminal of the power-frequency isolation transformer (15); the symmetric-type UPS power system is small in structure size and low in cost and has a good application effect.",
  "title": "SYMMETRICAL UPS POWER SYSTEM BASED ON NINE-PHASE SELF-COUPLING PHASE-SHIFTING TRANSFORMER"
}