ALEXANDRIA, Va., Jan. 29 -- United States Patent no. 12,212,248, issued on Jan. 28, was assigned to Hitachi Energy Ltd (Zurich, Switzerland).
"Modular MMC phase arm and control thereof" was invented by Jimmy Ohman (Ludvika, Sweden), Ying-Jiang Hafner (Ludvika, Sweden), Christer Sjoberg (Ludvika, Sweden) and Daniel Hallmans (Ludvika, Sweden).
According to the abstract* released by the U.S. Patent & Trademark Office: "There is provided a method of controlling a plurality of converter cells in a phase arm of a modular multilevel converter (MMC) in accordance with a main reference. The method includes dividing the main reference into a plurality of reference parts, and, by using a grouping of the plurality of converter cells into a plurality ...