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. 09, 2001
Filed:
Apr. 15, 1998
Applicant:
Inventors:
Assignee:
ABB Power T&D Company Inc., Raleigh, NC (US);
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H02J 1/14 ; H02J 1/700 ; H02H 7/00 ; H02H 9/00 ;
U.S. Cl.
CPC ...
H02J 1/14 ; H02J 1/700 ; H02H 7/00 ; H02H 9/00 ;
Abstract
As a variation of the non-orthogonal filter, a phasor estimate is computed by using an N-point window. An aspect of the sub-window cosine filter is to repeat the basic cosine filter for only selected points of the window. In the end, a least-squares fit is used to obtain an estimate for the phasors components. Previous cosine techniques use a data window whose length is greater than 1 cycle while the present invention requires only 1 cycle.