ALEXANDRIA, Va., Aug. 6 -- United States Patent no. 12,381,491, issued on Aug. 5, was assigned to CONTEMPORARY AMPEREX TECHNOLOGY (HONG KONG) Ltd. (Hong Kong).

"Method and apparatus for suppressing grid voltage imbalance" was invented by Guiying Lin (Fujian, China), Jinfeng Gao (Fujian, China) and Weichen He (Fujian, China).

According to the abstract* released by the U.S. Patent & Trademark Office: "The present application provides a method and apparatus for suppressing grid voltage imbalance. By obtaining a 90deg lagged grid voltage through a differential tracker, calculating instantaneous power using the 90deg lagged grid voltage, and then calculating a power converter voltage according to the instantaneous power, the suppression of gri...