The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 21, 2014
Filed:
Mar. 15, 2012
Akira Bando, Hitachi, JP;
Yasuhiro Kiyofuji, Hitachi, JP;
Masaya Ichinose, Hitachiota, JP;
Hiromitsu Sakai, Tokai, JP;
Yasuhiro Imazu, Hitachinaka, JP;
Akira Bando, Hitachi, JP;
Yasuhiro Kiyofuji, Hitachi, JP;
Masaya Ichinose, Hitachiota, JP;
Hiromitsu Sakai, Tokai, JP;
Yasuhiro Imazu, Hitachinaka, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
A commanded negative-sequence current is added to a commanded current so as to suppress double-frequency pulsation on the DC side. The commanded negative-sequence current is found from three values (i.e., the detected value of positive-sequence voltage vector on the power-supply side, the detected value of negative-sequence voltage vector, and a commanded positive-sequence current). Thus, the pulsations which occur on the DC side of a semiconductor power converter and which have a frequency double the power-supply frequency are suppressed even when the AC power supply is at fault while assuring stability of the current control system, thus permitting stable and continuous operation.