| 摘要 |
PURPOSE:To suppress the voltage and the current in a zero phase by inserting the respective windings of a reactor, which is constituted by winding three windings that are mutually insulated around an iron core at the same-phase polarity, to the one side of the connections between a pair of AC output terminals of each single-phase power converter and the corresponding primary windings of a three-phase transformer. CONSTITUTION:Windings 81,82 and 83 of a reactor 8 are inserted between AC output terminals U, V and W of single-phase power converters 51, 52 and 53 and terminals (u), (v) and (w) at one-side parts of corresponding primary windings 71, 72 and 73 of a three-phase transformer 7. Three windings 81, 82 and 83 of the reactor 8 are wound on the same iron core 84 at the same-phase polarity. Therefore, the impedance of the reactor 8 becomes high only for the instantaneous sum of the output voltages of the single-phase power converters 51, 52 and 53, that is, the zero-phase current. As a result, the overcurrent of a three-phase power converter 5 based on the zero-phase voltage can be effectively suppressed. |
