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:
Jul. 07, 2015
Filed:
Apr. 26, 2012
Applicant:
Teruyuki Ishizuki, Tokyo, JP;
Inventor:
Teruyuki Ishizuki, Tokyo, JP;
Assignee:
Kabushiki Kaisha Toshiba, , JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H02P 11/00 (2006.01); H02P 9/08 (2006.01); H02P 1/50 (2006.01); H02P 1/52 (2006.01); H02P 9/14 (2006.01);
U.S. Cl.
CPC ...
H02P 9/08 (2013.01); H02P 1/50 (2013.01); H02P 1/52 (2013.01); H02P 9/14 (2013.01);
Abstract
In one embodiment, there is provided a controller that performs control to supply driving electricity to a secondary winding of a variable-speed generator-motor from a secondary exciter and thereby start the variable-speed generator-motor from a standstill state in a variable-speed pumped storage system. The controller performs control to complete a start-up by the driving electricity from the secondary exciter and connect the variable-speed generator-motor in parallel with an electric power system, in a state where a rotating speed of the variable-speed generator-motor is lower than a lower limit speed of a variable-speed operation range.