ALEXANDRIA, Va., Sept. 10 -- United States Patent no. 12,413,156, issued on Sept. 9, was assigned to Mitsubishi Electric Corp. (Tokyo).
"Capacitor balancing control in an HVDC MMC" was invented by Shuhei Fujiwara (Tokyo), Yoshiyuki Kono (Tokyo), Ryosuke Uda (Tokyo), Takuya Kajiyama (Tokyo), Toshiyuki Fujii (Tokyo) and Shigeo Hayashi (Tokyo).
According to the abstract* released by the U.S. Patent & Trademark Office: "In an MMC-type power conversion device, a control device calculates an evaluation value representing the degree of variations in voltage of capacitors of individual converter cells. When this evaluation value exceeds a threshold value, the control device controls the converter cells as follows: (i) when current in a positive d...