| 摘要 |
<P>PROBLEM TO BE SOLVED: To prevent high-frequency current oscillation from increasing even when a connection period of one voltage between two phases accounts for almost all of a control period, without changing the control period in AC-AC power conversion equipment for directly converting a multiple-phase AC voltage of an input end to a multiple-phase AC voltage to supply it to an output end to which an inductive load is connected. <P>SOLUTION: A carrier generated by a carrier generation means 211 of an inverter control means 21 generates one single side carrier in an intermediate voltage period that has a connection period ratio of 50% or less and connects a voltage VRT between two phases, and generates two single side carriers in the maximum voltage period that has a connection period ratio exceeding 50% and connects a voltage VRS between two phases, thus setting a period of a zero vector in the maximum voltage period not only at the beginning and end of the maximum voltage period but also at the midpoint, and hence reducing a U-phase output end current in the intermediate portion to reduce the high-frequency current oscillation. <P>COPYRIGHT: (C)2010,JPO&INPIT |
