ALEXANDRIA, Va., June 19 -- United States Patent no. 12,334,739, issued on June 17.
"Hybrid direct current transmission system and control method thereof" was invented by Hua Li (Hohhot, China) and Tianlong Hong (Hohhot, China).
According to the abstract* released by the U.S. Patent & Trademark Office: "The present invention provides a hybrid direct current transmission system and a control method thereof, which belongs to the field of power electronics. The system includes: the rectifier side circuit adopts a heterogeneous series topology structure, the high-voltage valve group adopts LCC to withstand high voltage levels, and the low-voltage valve group adopts MMC to establish and maintain the voltage stability of the grid connection poi...