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:
Jan. 16, 1996
Filed:
Jun. 30, 1994
Takashi Mori, Tokyo, JP;
Fumitoshi Ichikawa, Kawaguchi, JP;
Kabushiki Kaisha Toshiba, Kawasaki, JP;
Abstract
A self-commutated static var compensator and a method is used for stabilizing a power system by controlling an output of a self-commutated converter for receiving/supplying power from/to the power system. A constant system voltage maintaining controller calculates a first target value signal of the reactive current in accordance with a difference between a reference voltage and a voltage detected by a voltage detector, and a reactive current controller generates a second target value signal of the reactive current in accordance with a difference between the first target value signal of the reactive current and a detected current. A converter controller applies a gate driving pulse to the self-commutated converter in response to the second target value signal of the reactive current and second target value signal of the active current. A loss reduction circuit stops the gate driving pulse corresponding to the second target value of the reactive current from being supplied to the gate of the self-commutated converter when reactive power output from the self-commutated converter is close to zero.