| 摘要 |
A method for controlling a modular converter (10) with a plurality of converter modules (12) comprising the steps of: selecting possible future switching sequences of the converter (10) based on an actual converter switching state, wherein a switching sequence is a series of converter switching states with at least one converter switching state and a converter switching state comprises switching states of the converter modules;predicting a future current trajectory for each switching sequence based on actual internal currents and on actual internal voltages;determining candidate sequences from the switching sequences, wherein a candidate sequence is a switching sequence with a current trajectory that respects predefined bounds with respect to a reference current or, when a predefined bound is violated, moves the current closer to such a predefined bound;predicting future module voltages for each candidate sequence based on actual module voltages and the current trajectory of the respective candidate sequence;evaluating a cost function for each candidate sequence, wherein the cost function is based on the converter switching states of the switching sequence, the future module voltages and/or future currents;and selecting the next converter switching state as a first converter switching state of a candidate sequence with minimal costs. |
