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Abstract

A method for controlling an electrical converter comprises determining an actual modulation index (m) and an actual pulse number (d); determining a neutral point voltage (v_np) of the neutral point (NP); determining an actual neutral point balancing value from the neutral point voltage (v_np); determining an optimized pulse pattern to be applied to the electrical converter from a table of optimized pulse patterns stored in a controller of the electrical converter; and applying the determined optimized pulse pattern to the electrical converter. The table of optimized pulse patterns is indexed with respect to a set of modulation indices (m) and a set of pulse numbers (d) and the optimized pulse pattern is determined based on the actual modulation index (m) and the actual pulse number (d). For a modulation index (m) and a pulse number (d), an optimized pulse pattern stored in the table comprises switching angles and at least one of a switching state and switching transition of the at least one phase leg for each switching angle. For at least some modulation indices (m) and some pulse numbers (d), an optimized pulse pattern stored in the table with respect to a modulation index (m) and a pulse number (d) comprises switching angles, which correspond to different neutral point balancing values. The switching angles of the optimized pulse pattern to be applied to the electrical converter are determined from the switching angles, which correspond to different neutral point balancing values, as a function of the actual neutral point balancing value.

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First Claim