{
  "$type": "site.standard.document",
  "description": "Disclosed is an automatic synchronous parallelization apparatus capable of suppressing an inrush current by automatically adjusting the magnitude, the frequency, and the phase of the voltage when a single-phase voltage-type DC-to-AC converting device performing an autonomous parallel operation is…",
  "path": "/patents/1010727",
  "publishedAt": "2011-07-27T00:00:00.000Z",
  "site": "at://did:plc:oql6ds5vnff4ugar6rruliwd/site.standard.publication/3mn3ohu7oxx5w",
  "tags": [
    "H02J3/42",
    "ORIGIN ELECTRIC [JP]"
  ],
  "textContent": "Disclosed is an automatic synchronous parallelization apparatus capable of suppressing an inrush current by automatically adjusting the magnitude, the frequency, and the phase of the voltage when a single-phase voltage-type DC-to-AC converting device performing an autonomous parallel operation is connected in parallel with an external single-phase AC voltage source. The automatic synchronous parallelization apparatus 17 according to the present invention includes a synchronization detecting circuit 130, a voltage amplitude command value generating circuit 180, and a frequency command value generating circuit 190. The voltage amplitude command value generating circuit 180 generates the 1st-axis voltage command value, and the frequency command value generating circuit 190 generates the 2nd-axis voltage command value, based on a value relating to a frequency difference between an external single-phase AC voltage source 12 and a single-phase voltage-type DC-to-AC converting device 11 and an effective value of a voltage of the external single-phase AC voltage source 12 that are detected by synchronization detecting circuit 130. By using such command values, an output of the single-phase voltage-type DC-to-AC converting device 11 can be adjusted to as to coincide with a voltage waveform of the external single-phase AC voltage source 12.",
  "title": "Synchronization detecting circuit and automatic synchronous parallelization apparatus"
}