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. 04, 2001
Filed:
Mar. 21, 1996
Einar V. Larsen, Charlton, NY (US);
Kara Clark, Scotia, NY (US);
Reigh Walling, Cliffon Park, NY (US);
General Electric Company, New York, NY (US);
Abstract
A static series voltage regulator (SSVR) for an electric power distribution system protects a load on a feeder branch from voltage dips by boosting voltage under certain conditions. The SSVR contains a 3-phase voltage source inverter and a source bridge, fed from a source, supplying the dc side of the inverter. A series transformer is connected between the power source and a load coupling the inverter output to appear between the power source and the load. A surge filter connected in parallel with the series transformer protects the load from fast front voltage pulses produced by the inverter, and isolation and bypass switches isolate the inverter and series transformer from the power source and load. The inverter is controlled so that during normal operation it acts as a short on the series transformer, and, during a fault that causes a dip in the source voltage, it injects voltage in series with the source voltage to provide a boost action to maintain load voltage at a desired magnitude and balance. The SSVR senses the incoming voltage from the utility and load current and constructs what the load voltage would be in the absence of boost action. This information is processed through a minimum detector to obtain a signal V,which rapidly responds to a voltage dip but remembers a dip happened for a few cycles. When V,falls below some threshold then boosting begins to bring load voltage to a desired level. Boosting is halted after V,exceeds the threshold, or when the load voltage exceeds a high voltage threshold.