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. 29, 2025
Filed:
Aug. 31, 2021
Applicant:
Hitachi Energy Ltd, Zürich, CH;
Inventor:
Tord Bengtsson, Västerås, SE;
Assignee:
HITACHI ENERGY LTD, Zurich, CH;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G01R 23/06 (2006.01); G01R 19/25 (2006.01); G01R 23/18 (2006.01);
U.S. Cl.
CPC ...
G01R 23/06 (2013.01); G01R 19/2513 (2013.01); G01R 23/18 (2013.01);
Abstract
A method for providing a frequency of an electrical quantity in an electrical power system comprises obtaining, with respect to a first time, a first discrete Fourier transform (DFT) phasor of an electrical quantity in the electrical power system, estimating a second DFT phasor at a time interval before the first time, where the time interval depends on an approximated frequency, and determining the frequency at the first time based on the first and the second DFT phasor.