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.:

US 7342758 B1

Date of Patent:

Mar. 11, 2008

Filed:

Dec. 29, 2003

Method and system for detecting stand-alone operation of a distributed generating system

Applicants:

Yung-hsiang Liu, Taipei, TW;

Tain-syh Luor, Chungho, TW;

Shyh-jier Huang, Tai Nan, TW;

Jeu-min Lin, Feng Shan, TW;

Inventors:

Yung-Hsiang Liu, Taipei, TW;

Tain-Syh Luor, Chungho, TW;

Shyh-Jier Huang, Tai Nan, TW;

Jeu-Min Lin, Feng Shan, TW;

Assignee:

Industrial Technology Research Institute, Hsinchu Hsien, TW;

Attorney:

Rabin & Berdo, P.C.

Primary Examiner:

Michael Sherry

Assistant Examiner:

Ann T Hoang

Int. Cl.

CPC ...

H02H 3/27 (2006.01); H02H 3/46 (2006.01); H02H 7/22 (2006.01);

U.S. Cl.

CPC ...

Abstract

A method and a system for detecting stand-alone operation of a distributed generating system having a generating source connected in shunt with an independent power distribution system via a first branch breaker are proposed. A voltage or a frequency signal on the independent power distribution system is read. The wavelet transformation is performed on the voltage or frequency signal to form a time versus high-frequency component window and a time versus low-frequency component window for conveniently detecting the perturbation in the time domain of the signal. Next, whether the absolute value of the high-frequency component is greater than a threshold value and whether the duration is longer than another threshold value are determined. If both answers are yes, a stand-alone operation occurs. An alarm signal is immediately generated and sent to the first branch breaker to release the connection between the generating source and the power distribution system.

Find Patent Forward Citations

Liu, Yung-Hsiang. (2008). Method and system for detecting stand-alone operation of a distributed generating system (U.S. Patent No. 7342758). U.S. Patent and Trademark Office. https://idiyas.com/patent/badge/7342758

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