| 摘要 |
A method of operating a three level converter (20) includes controlling the output voltage of the converter when a DC link voltage of the three level converter (20) is lower than one-half of a rated DC link voltage of the converter (20) by, for each leg of the converter (112), alternately connecting an output terminal of the leg to the positive terminal or the negative terminal of the DC link (46). When the DC link voltage is at least one-half of the rated DC link voltage, the method includes controlling the output voltage of the converter (20) by, for each leg (112), selectively connecting the output terminal of the converter to the positive terminal, the negative terminal, or a mid-point of the DC link (46). |
