MODEL PREDICTIVE CONTROL WITH REFERENCE TRACKING

摘要

An electrical converter (10) comprising a plurality of semiconductor switches (16), wherein the electrical converter is adapted for generating a two-level or multi-level output voltage from an input voltage by switching the plurality of semiconductor switches (16). A method for controlling the electrical converter (10) comprises the steps of: receiving a reference electrical quantity (i S *) and an actual electrical quantity (i S ); determining a sequence of future electrical quantities of the electrical converter (10) from the actual electrical quantity; determining a maximal cost value based on the sequence of future electrical quantities; iteratively determining an optimal switching sequence for the electrical converter (10), wherein a switching sequence comprises a sequence of future switching states for the semiconductor switches of the electrical converter; and selecting the first switching state of the optimal switching sequence as the next switching state (u) to be applied to the semiconductor switches (16) of the electrical converter (10). The optimal switching sequence is iteratively determined by: extending a switching sequence by appending a possible switching state to the switching sequence; determining a cost value for the extended switching sequence with a cost function based on the sequence of future electrical quantities; and discarding the extended switching sequence, when the cost value is higher than the maximal cost value.