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:
Dec. 05, 2006
Filed:
Jun. 02, 2006
Akira Kikuchi, Hitachi, JP;
Motoo Futami, Hitachiota, JP;
Yasuhiro Imazu, Hitachi, JP;
Yoshio Eguchi, Hitachi, JP;
Akira Kikuchi, Hitachi, JP;
Motoo Futami, Hitachiota, JP;
Yasuhiro Imazu, Hitachi, JP;
Yoshio Eguchi, Hitachi, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
A wind turbine generator system is equipped with a three phase generator connected to a shaft of a windmill, a converter connected to a stator of the generator, and an inverter connected to the converter and also to an electric power system. The system extracts a torsional vibration component of the shafting between the windmill and generator from the detected rotation speed of the generator, regulates the active component of the current command to the converter according to the vibration component, and controls so as to minimize the rotation speed variation of the generator.