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:
Jun. 10, 2014
Filed:
Mar. 30, 2011
Gerardo Escobar, Baden, CH;
Antonio Coccia, Baden, CH;
Leonardo-augusto Serpa, Zürich, CH;
Sami Pettersson, Wettingen, CH;
Yales De-novaes, Joinville, BR;
Gerardo Escobar, Baden, CH;
Antonio Coccia, Baden, CH;
Leonardo-Augusto Serpa, Zürich, CH;
Sami Pettersson, Wettingen, CH;
Yales De-Novaes, Joinville, BR;
ABB Research Ltd., Zürich, CH;
Abstract
An exemplary method and arrangement for estimating the frequency and the positive sequence of a fundamental component of a measured three-phase voltage are disclosed (ν). The method includes measuring the three-phase voltage (ν), calculating estimates of a fundamental frequency voltage component ({circumflex over (ν)}) and a difference ({circumflex over (φ)}) between positive and negative sequence components of the fundamental frequency voltage from an error ({tilde over (ν)}) between the measured three-phase voltage (ν) and at least one of the calculated estimates of the fundamental frequency voltage component ({circumflex over (ν)}) and from an estimate of the angular frequency ({circumflex over (ω)}) of the fundamental frequency voltage component, wherein the estimate of the angular frequency ({circumflex over (ω)}) of the fundamental frequency voltage component is calculated from at lest one of the estimated differences ({circumflex over (φ)}) and from the error ({tilde over (ν)}) between the measured three-phase voltage and at least one of the calculated estimates of the fundamental frequency voltage component.