| 摘要 |
PROBLEM TO BE SOLVED: To solve such a problem in a conventional case where the AC output of a plurality of single-phase 3-level inverter cells are connected with the AC output of 3-phase 3-level inverter cells that when sequentially arranging and wiring the secondary wirings of a transformer for connection with a three-phase 3-level inverter cell, and single-phase 3-level inverter cells for U-phase, V-phase and W-phase, the maximum voltage applied between adjacent secondary windings becomes high voltage at a part, thus up-sizing the transformer.SOLUTION: Out of the secondary windings of a transformer for connection with the AC inputs of a three-phase 3-level inverter cell and a single-phase 3-level inverter cell, two sets for the three-phase 3-level inverter cell and six sets for the single-phase 3-level inverter cell are arranged in order, and connection of the secondary winding of the transformer and the AC input terminal of the 3-level inverter cell is crossed partially, thus reducing the voltage applied between the adjacent windings. |
