| 摘要 |
PROBLEM TO BE SOLVED: To reduce harmonics current at the primary side of a transformer, by forming a star connection at the primary side of the transformer, shifting the phases of the three three phase coil windings out of nine three phase coil windings at the secondary side of the transformer, and shifting the phase difference of the remaining six three phase coil windings to a specific phase difference. SOLUTION: A three phase primary coil winding 3 of a transformer 2 is formed in a star connection, the phase difference of secondary coil windings 4, 7, and 9 out of three phase secondary coil windings 4-12 of the transformer 2 is set to 20 degrees, and the phase difference of secondary coil windings 5, 6, 8, 9, 11, and 12 is set to 10 degrees. Single-phase inverters 13-21 rectify three-phase AC and convert it to a DC power and inversely converts it to a single-phase AC. 1/3 of the entire capacity of the inverter device turns into 18-pulse configuration at the primary side of the transformer 2 in the inverter device 1, 2/3 of the entire capacity of the inverter device 1 turns into 36-pulse configuration, and harmonics current can be reduced as compared with a case where 18 pulses are configured by the entire inverter device 1. |
