| 摘要 |
PROBLEM TO BE SOLVED: To suppress the resonance current of the DC bus of a three-level inverter device, and to improve conversion efficiency and operation stability. SOLUTION: This inverter device is equipped with a converter 1, that converts AC supply power into DC power, an inverter 2 that converts converted DC power into an AC power, and a DC link 3 that connects the converter to the inverter. The DC link 3 has two smoothing capacitors 4a and 4b that are connected between positive-electrode and negative-electrode potential buses P and N in series and store the DC power obtained by the capacitor 1, and two smoothing capacitors 4c and 4d that are connected between the positive- electrode and negative-electrode potential buses P and N in series and store the DC power that is supplied to the inverter 2. In the positive-electrode and negative-electrode potential buses, reactors 7a and 7b for resonance suppression are provided, respectively. In an intermediate potential bus, a resistor 6 for resonance suppression is provided. |
