| 摘要 |
<p>A method in a controller for energizing a chain-link converter including one or more phase legs, each phase leg including a number of series-connected converter cells, each converter cell including four valves arranged in an H-bridge connection with a DC capacitor. Each valve in turn includes a semiconductor switch in parallel with a diode. The method includes the steps of: charging the DC capacitor of each converter cell to a voltage level at which the semiconductor switches are controllable but below their nominal voltage; diagnosing the converter cells so as to detect failed components thereof; bypassing faulty components in a controlled manner; charging the DC capacitors to their nominal voltage. The invention also relates to a controller, computer programs and computer program products.</p> |
