| 摘要 |
The present disclosure relates to a method for controlling a chain-link power converter (1), said converter comprising three phase legs (2), each of which phase legs comprising a plurality of series-connected converter cells (3), each of the cells comprising a DC capacitor, the phase legs being connected in a delta configuration. The method comprises: detecting an unsymmetrical voltage condition at a terminal of the converter; determining a ratio between a zero sequence and a negative sequence component of a compound current to be injected into the converter, based on the detected unsymmetrical voltage condition; calculating the compound current comprising the zero sequence component and the negative sequence component in accordance with the determined ratio; and injecting the compound current into the converter to control the converter in view of the detected unsymmetrical voltage condition. |
