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. 01, 2020
Filed:
Oct. 09, 2018
Abb Schweiz Ag, Baden, CH;
ABB Schweiz AG, Baden, CH;
Abstract
A method for islanding detection in an electrical power grid supplied by an electrical power source. The method includes measuring an output voltage (V) and a grid current (I) at an interconnection point of the power source with the power grid; estimating at least one grid parameter from the output voltage (V) and the grid current (I) based on optimizing a cost function, which minimizes a difference between the measured output voltage (V) and an estimated output voltage or a difference between the measured grid current (I) and an estimated grid current, which estimated output voltage or estimated output current is a function of the measured grid current (I) or the measured output voltage (V) and the least one estimated grid parameter; and detecting an islanding condition by detecting a jump and/or a deviation in the at least one estimated grid parameter.