ALEXANDRIA, Va., June 9 -- United States Patent no. 12,651,973, issued on June 9, was assigned to Hitachi Energy Ltd. (Zurich, Switzerland).
"Method for operating a converter, converter and computer program product" was invented by Michail Vasiladiotis (Zurich) and Nicolas Sierro (Uvrier, Switzerland).
According to the abstract* released by the U.S. Patent & Trademark Office: "A method can be used for operating a converter that converter includes a control arrangement and modular-multilevel converters that are coupled in a parallel circuit. Each modular-multilevel converters includes branches, each having a cell with a capacitor and semiconductor switches. First voltage reference signals are generated as a function of a DC voltage referen...